JP6489691B2 - Extrusion mold - Google Patents

Description

  The present invention relates to an extrusion mold used for extrusion molding of a long molded product.

  Conventionally, as a method for continuously molding a synthetic resin such as ultra high molecular weight polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE), polyimide, ram extrusion as described in Patent Documents 1 to 3, for example There is molding.

  In the above-described ram extrusion molding, the resin melted in the heating region passes through the cooling region in the resin flow path formed in the mold connected to the extruder. At that time, the molten resin has a surface solidified region (region upstream of the cooling region and only the surface of the resin is solidified), a complete solidified region (region downstream of the cooling region and solidified to the inside of the resin). ) To solidify sequentially to form a continuous molded product.

JP-A-6-155553 Japanese Patent Laid-Open No. 10-193433 Japanese Patent No. 5087621

  By the way, some of the extrusion-molded products formed as described above have difficulty in adjusting predetermined dimensions and appearance properties by post-processing such as cutting (for example, a T-shaped or U-shaped cross-sectional shape). Etc.). In this case, since the dimensions and appearance properties formed by extrusion are directly used as the product dimensions and appearance properties, high dimensional accuracy and appearance quality are required.

  As described above, in order to obtain good dimensional accuracy and appearance quality, it is important to reduce the shrinkage when the resin is cooled and solidified, and in order to do so, the internal resin pressure is increased in the surface solidified region. It is necessary to hold the pressure so that

  In this regard, for example, after lengthening the resin passage of the mold or adjusting the molding conditions (cylinder temperature, extrusion temperature, mold temperature, cooling water temperature, cooling water amount, etc.) and solidifying the resin flow path and the surface It can be considered that the internal resin is held in the surface solidified region by increasing the sliding resistance with the resin. However, if the resin passage of the mold is lengthened, the mold becomes large, which is not preferable in terms of cost and installation space. Also, when trying to increase the sliding resistance by adjusting the molding conditions, it is difficult to control.

  An object of the present invention is to solve the above-mentioned problems. An object of the present invention is to provide an extrusion mold capable of forming an extrusion-molded product having desired dimensional accuracy and appearance properties relatively easily, and in terms of cost. And it is providing the metal mold | die for extrusion excellent in the viewpoint of installation space.

  (1) In order to solve the above problem, an extrusion mold according to an aspect of the present invention includes an upper mold and a lower mold, and the upper mold and the lower mold are clamped to each other by an extruder. A resin passage through which the extruded molten resin passes is formed, and the molten resin is cooled and flows out from a resin passage outlet formed at the downstream end of the resin passage to form a long resin member. The mold for extrusion molding, wherein the upper mold and the lower mold are a heating area in which the molten resin extruded by the extruder is heated, and the molten resin after passing through the heating area. And a cooling region in which the resin passage is to be cooled, a gap is formed between the upper die and the lower die in a portion of the resin passage on the resin passage outlet side, and the upper die is disposed in the cooling region. The gap is pressed against the lower mold side. By narrowing the, further comprising a pressing portion, to reduce the vertical passage section in the longitudinal direction of the resin passage outlet-side portion of the resin passage.

  In this configuration, the molten resin extruded by the extruder passes through the resin passage and is cooled and solidified by the cooling region provided on the downstream side of the resin passage, whereby a long resin member is formed. The The long resin member formed in this manner is sequentially discharged from the resin passage outlet and cut into a desired length, thereby producing an extruded product.

  Further, in this configuration, a gap is formed between the upper mold and the lower mold at the resin passage outlet side portion of the resin passage, and the upper mold is pressed toward the lower mold by the pressing portion, thereby allowing the downstream of the cooling region. The gap on the side can be narrowed. If the clearance on the downstream side of the cooling region is narrowed in this manner, the sliding resistance between the resin member passing through the downstream side of the cooling region (resin passage outlet side) and the resin passage increases. The internal resin pressure of the passing resin member (resin member whose surface is solidified and in which the inside is in a molten state) increases. Thereby, when the internal resin is cooled and solidified, it can be prevented from being greatly contracted.

  And according to this structure, since it is not necessary to lengthen the resin path in order to increase the sliding resistance between the long resin member and the resin path, the increase in size and cost of the mold can be suppressed. . Furthermore, according to this configuration, the sliding resistance between the long resin member and the resin passage can be easily adjusted by adjusting the pressing amount of the upper die by the pressing portion.

  Therefore, according to this configuration, an extrusion mold that can form an extrusion-molded product having desired dimensional accuracy and appearance properties relatively easily, and is excellent in terms of cost and installation space. Can provide molds.

  (2) Preferably, one of the upper mold and the lower mold has an inclined surface in which the gap formed between the other is gradually increased along the traveling direction of the long resin member. The pressing part presses the upper mold toward the lower mold and bends a portion of the upper mold on the resin passage outlet side.

  In this configuration, a gap between the upper mold and the lower mold can be easily formed by forming an inclined surface on one of the upper mold and the lower mold. Further, according to this configuration, the gap between the upper mold and the lower mold can be easily adjusted by pressing the upper mold toward the lower mold and bending the portion of the upper mold on the resin passage outlet side.

  (3) Preferably, the upper mold is a lower mold of the upper mold, and an upper middle mold that forms the gap with the lower mold, and an upper mold of the upper mold The upper and outer molds holding the upper and middle molds, wherein the pressing part is constituted by a pressing bolt that is screwed into a screw hole formed in the upper and outer molds, and the tip part is the upper and outer molds. By projecting downward from the lower surface of the mold, the upper middle mold is pressed toward the lower mold.

  In this configuration, since the pressing portion is constituted by a bolt (pressing bolt), the sliding resistance between the long resin member and the resin passage can be easily adjusted by adjusting the tightening amount of the pressing bolt. Can be done.

  (4) Preferably, the upper mold is a part on the resin passage outlet side provided as a member different from the fixed side part and the fixed side part, and is vertically oriented with respect to the fixed side part. The movable portion is movable, and the pressing portion pushes the movable portion to move the movable portion to the lower mold side.

  In this configuration, the movable portion of the upper mold is pressed by the pressing portion, thereby reducing the gap between the upper mold and the lower mold and increasing the sliding resistance between the long resin member and the resin passage. can do. Further, in this configuration, since the fixed side portion and the movable side portion are formed separately, for example, it is necessary to bend the upper mold to reduce the gap as in the case where they are integrally formed. Therefore, an extrusion mold having excellent durability can be provided.

  (5) More preferably, the extrusion mold is further provided with a protrusion fixed to the lower mold, and a tip portion protruding upward from the upper surface of the lower mold and contacting the lower surface of the movable portion. Yes.

  In this configuration, since the width of the gap between the upper mold and the lower mold can be stabilized by the amount of protrusion of the protrusion, the sliding resistance between the long resin member and the resin passage can also be stabilized. In addition, according to this configuration, even if the extrusion mold is disassembled and reassembled, the width of the gap is easily reproduced, so that a long resin with little variation in dimensional accuracy and appearance properties from lot to lot. A member can be generated.

  (6) More preferably, the protrusion is an adjustment bolt capable of adjusting an amount of protrusion of the tip with respect to the upper surface.

  In this configuration, since the bolt (adjustment bolt) is used as the protruding portion, the protruding amount of the protruding portion based on the upper surface of the lower mold can be easily adjusted by adjusting the tightening amount of the bolt. Thereby, the adjustment of the sliding resistance between the long resin member and the resin passage can be easily performed.

  (7) Preferably, the inner peripheral surface of the resin passage is hard-plated.

  According to this configuration, the sliding resistance between the upstream portion of the resin passage and the long resin member can be reduced. Then, by increasing the sliding resistance on the downstream side of the resin passage (the portion where a gap is formed between the upper die and the lower die in the resin passage), the upstream portion and the downstream portion of the resin passage The difference in sliding resistance can be increased. Thus, by increasing the sliding resistance difference between the upstream portion and the downstream portion of the resin passage, the size adjustment range and the appearance property adjustment range of the long resin member can be expanded.

  (8) Preferably, a plurality of the resin passages are formed in the extrusion mold, and the extrusion mold includes a plurality of the pressing portions arranged along the arrangement direction of the plurality of resin passages. In addition.

  In this configuration, the sliding resistance of the long resin member traveling in each of the plurality of resin passages can be finely adjusted by individually adjusting the pressing amount of each pressing portion against the upper mold. Thereby, the dimensional accuracy and appearance property of each long resin member can be finely adjusted individually.

  According to the present invention, an extrusion mold capable of forming an extrusion-molded product having desired dimensional accuracy and appearance properties relatively easily, and having an excellent extrusion mold in terms of cost and installation space. Can be provided.

It is the schematic diagram which looked at the extruder, the metal mold | die for extrusion molding, and the elongate resin member shape | molded by these from the side. It is a cross-sectional perspective view of an elongate resin member. It is the figure which looked at the metal mold | die for extrusion molding from upper direction. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG. It is sectional drawing in the VI-VI line of FIG. It is a figure which expands and shows a part of FIG. 5, Comprising: It is a figure which shows the state before performing the press of an upper middle type | mold with a press volt | bolt. It is a figure which shows the state after performing the press of the upper middle type | mold with a press volt | bolt from the state shown in FIG. It is the figure which looked at the metal mold | die for extrusion molding which concerns on a modification from upper direction. It is the figure which looked at the metal mold | die for extrusion molding shown in FIG. 9 from the downward direction. It is sectional drawing in the XI-XI line of FIG. It is sectional drawing in the XII-XII line | wire of FIG. It is an enlarged view of the VIII part of FIG. (A)-(C) is a longitudinal cross-sectional view which respectively shows the part between the upper middle type | mold and lower middle type | mold for the extrusion mold which concerns on a modification. It is a cross-sectional perspective view which shows the shape of a test piece typically.

  Below, the mold 1 for extrusion molding which concerns on embodiment of this invention is demonstrated. FIG. 1 is a schematic view of an extruder 50, an extrusion mold 1 and a long resin member 55 molded by these, viewed from the side.

  In each drawing described below, for convenience of explanation, the direction indicated by the arrow described as the front is referred to as the front side, the front side, or the front side, and the direction indicated by the arrow described as the rear side is the rear side or the rear side. Or the back side, the direction indicated by the arrow indicated as right is referred to as the right side, the direction indicated by the arrow indicated as left is referred to as the left side, and the direction indicated by the arrow indicated above is indicated as the upper side or The direction indicated by the upward direction and the direction indicated by the arrow described as the lower direction is referred to as the lower side or the lower side.

  In the extrusion mold 1, the pellet-shaped resin material M sequentially extruded by the piston 51 (also referred to as a ram) of the extruder 50 is heated by the plasticizing cylinder 52 and the extrusion mold 1 of the extruder 50. It passes through the resin passage 18 formed in the extrusion mold 1 while being heated and melted by the region HZ. The molten resin passing through the resin passage 18 is cooled and solidified by a cooling region CZ provided on the downstream side of the extrusion mold 1. Thereby, a continuous long resin member 55 is sequentially formed. The long resin member 55 is sequentially discharged from the resin passage outlet 19 of the resin passage 18 and then cut into a desired length to form an extruded product.

[Shape of long resin member]
FIG. 2 is a cross-sectional perspective view of the long resin member 55. In the extrusion mold 1 according to this embodiment, a long resin member 55 elongated in the front-rear direction is formed. As shown in FIG. 2, the long resin member 55 is a so-called deformed extruded product formed so that a cross section perpendicular to the longitudinal direction is substantially T-shaped. The long resin member 55 includes a first portion 56 having a lower surface 56a formed in a flat shape and extending in the front-rear direction, and a second portion 57 extending in the front-rear direction at the center in the left-right direction on the upper surface 56b of the first portion 56. These are integrally formed.

[Configuration of extrusion mold]
FIG. 3 is a view of the extrusion mold 1 as viewed from above. 4 is a sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a sectional view taken along line VV in FIG. 3, and FIG. 6 is a sectional view taken along line VI-VI in FIG. .

  Referring to FIGS. 3 to 6, an extrusion mold 1 includes a mold body 2 having an upper mold 3 and a lower mold 4, a plurality of clamping bolts 27, and a plurality of surface pressure adjusting bolts 28. And a plurality of pressing bolts 29 (pressing portions).

[Configuration of upper mold]
The upper die 3 has an upper outer die 5 and an upper middle die 6 with reference to FIGS. 4 to 6.

  The upper outer mold 5 is provided as an upper part of the upper mold 3. 4 and 5, the upper and outer mold 5 is composed of an upper and outer mold main body 11 formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction, and the upper and outer mold main body 11. And an extended portion 12 that extends further rearward from the rear portion of the two, and these are integrally formed. The extension part 12 is formed in a semicircular arc shape that swells upward when viewed from the rear side. The extension part 12 constitutes the extruder connecting part 20 together with the extension part 32 formed in the lower mold 4 described later in detail in a state where the upper mold 3 and the lower mold 4 are clamped together.

  A recess 11 a into which the upper middle mold 6 is fitted is formed on the lower side of the upper outer mold main body 11. The upper middle mold 6 is fitted into the recess 11a. That is, the upper outer mold 5 and the upper middle mold 6 have a nested structure.

  A plurality of clamping bolt screw holes 13, a plurality of surface pressure adjusting bolt screw holes 14, and a plurality of pressing bolt screw holes 15 are formed in the upper and outer mold main body 11. Each screw hole 13, 14, 15 is formed by a screw hole penetrating the upper outer mold main body 11 in the vertical direction. In FIG. 3, the screw holes 13, 14, 15 are not shown, but the positions of the screw holes 13, 14, 15 correspond to the positions of bolts 27, 28, 29 described later in detail. doing. Specifically, the position of the clamping bolt screw hole 13 corresponds to the position of the clamping bolt 27, the position of the surface pressure adjusting bolt screw hole 14 corresponds to the position of the surface pressure adjusting bolt 28, and is pressed. The position of the bolt screw hole 15 corresponds to the position of the pressing bolt 29.

  The screw holes 13 for the clamping bolts (formed corresponding to the positions of the clamping bolts 27 in FIG. 3) are provided in the front-rear direction on the right end portion, the central portion, and the left end portion of the upper and outer mold main body 11, respectively. Are formed at equal intervals (specifically, 11 at the right and left portions and 9 at the central portion). Two screw holes 13 for the clamping bolts are formed in the vicinity of the extension 12 in the upper and outer mold main body 11. That is, 31 screw holes 13 for clamping bolts are formed in the upper and outer mold main body 11. On the inner peripheral surface of each mold clamping bolt screw hole 13, a female screw to which the mold clamping bolt 27 can be screwed is formed. The screw holes 13 for the clamping bolts are formed substantially uniformly over the entire upper and outer mold main body 11, that is, over both the heating region HZ and the cooling region CZ.

  Twelve screw holes 14 for surface pressure adjustment bolts (formed corresponding to the position of the surface pressure adjustment bolt 28 in FIG. 3) are formed in the heating region HZ of the upper and outer mold main body 11. Specifically, the screw hole 14 for the surface pressure adjusting bolt is provided in each of the right side portion, the left and right direction central portion, and the left side portion in the heating region HZ of the upper and outer mold main body portion 11 in the front-rear direction and the like. A plurality (specifically, four) are formed at intervals. On the inner peripheral surface of each surface pressure adjusting bolt screw hole 14, a female screw to which the surface pressure adjusting bolt 28 can be screwed is formed.

  Four screw holes 15 for pressing bolts (formed corresponding to the position of the pressing bolt 29 in FIG. 3) are formed in the cooling region CZ of the upper and outer mold main body 11. Specifically, two screw holes 15 for pressing bolts are formed in the cooling area CZ of the upper and outer mold main body 11 so as to be spaced apart from each other on the right side portion and the left side portion. . A female screw to which the pressing bolt 29 can be screwed is formed on the inner peripheral surface of each pressing bolt screw hole 15.

  4 and 5, a plurality of (three in the present embodiment) cooling water pipes 16 are formed in the cooling region CZ of the upper and outer mold body 11. Each cooling water pipe 16 is formed by a through-hole penetrating the cooling region CZ of the upper and outer mold main body 11 in the left-right direction. Cooling water flows through the cooling water pipe 16. Thereby, the molten resin conveyed sequentially from the heating area HZ of the mold 1 for extrusion molding can be cooled and solidified.

  The upper middle mold 6 is a nesting that is fitted into a recess 11 a formed in the upper outer mold 5 with reference to FIGS. 4 and 5. The upper middle mold 6 is constituted by an upper middle mold main body 21 formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction.

  With reference to FIGS. 4 and 5, the upper middle mold main body portion 21 includes a plurality of clamping bolt through holes 23, a plurality of surface pressure adjusting bolt recesses 24, and a plurality of pressing bolt recesses 25. Is formed.

  Thirty-one clamping bolt through holes 23 (formed corresponding to the positions of the clamping bolts 27 in FIG. 3) are formed in the upper middle mold body 21. Specifically, each mold clamping bolt through hole 23 is formed at a position overlapping with each mold clamping bolt screw hole 13 when viewed from above in a state where the upper middle mold 6 is fitted into the upper outer mold 5. Yes. Each through-hole 23 for clamping bolts is formed in a size that allows the clamping bolt 27 to be inserted.

  Twelve surface pressure adjusting bolt recesses 24 (formed corresponding to the position of the surface pressure adjusting bolt 28 in FIG. 3) are formed in the heating region HZ of the upper middle mold main body 21. Specifically, each surface pressure adjusting bolt recess 24 is formed at a position overlapping each surface pressure adjusting bolt screw hole 14 when viewed from above in a state where the upper middle die 6 is fitted into the upper outer die 5. ing. As shown in FIGS. 4 and 5, each surface pressure adjusting bolt recess 24 is formed in such a size that the lower end portion of the surface pressure adjusting bolt 28 can be inserted therethrough.

  Four pressing bolt recesses 25 (formed corresponding to the positions of the pressing bolts 29 in FIG. 3) are formed in the cooling region CZ of the upper middle mold main body 21. Specifically, each pressing bolt recess 25 is formed at a position overlapping with each pressing bolt screw hole 15 when viewed from above in a state where the upper middle mold 6 is fitted into the upper outer mold 5. Each pressing bolt concave portion 25 is formed in a concave shape that is recessed downward from the upper surface of the upper middle mold main body portion 21. As shown in FIG. 5, each pressing bolt recess 25 is formed in such a size that the lower end of the pressing bolt 29 can be inserted therethrough.

[Lower structure]
The lower mold 4 has a lower outer mold 7 and a lower middle mold 8 with reference to FIGS. 4 to 6.

  The lower outer mold 7 is provided as a lower part of the lower mold 4. 4 and 5, the lower outer mold 7 includes a lower outer mold main body 31 formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction, and the lower outer mold main body 31. And an extended portion 32 extending further to the rear side from the rear side portion, and these are integrally formed. The extension part 32 is formed in a semicircular arc shape that swells downward when viewed from the rear side. As described above, the extending part 32 constitutes the extruder connecting part 20 together with the extending part 12 formed on the upper and outer molds 5 in a state where the upper mold 3 and the lower mold 4 are clamped to each other. Referring to FIG. 4, an extruder side resin passage 20 a through which the molten resin extruded by the extruder 50 passes is formed inside the extruder connecting portion 20.

  On the upper side of the lower outer mold main body 31, a recess 31a into which the lower middle mold 8 is fitted is formed. The lower middle mold 8 is fitted into the recess 31a. That is, the lower outer mold 7 and the lower middle mold 8 have a nested structure, like the upper outer mold 5 and the upper middle mold 6.

  A plurality of screw holes 33 for clamping bolts are formed in the lower outer mold main body 31 with reference to FIG. The mold clamping bolt screw hole 33 is formed by a screw hole penetrating the lower outer mold main body 31 in the vertical direction.

  Thirty-one clamping bolt screw holes 33 (formed corresponding to the position of the clamping bolt 27 in FIG. 3) are formed in the lower outer mold main body 31. Specifically, each of the mold clamping bolt screw holes 33 is the above-described mold clamping bolt screw hole 13 and each mold clamping bolt through-hole 23 in a state where the upper mold 3 and the lower mold 4 are clamped together. It is formed in the position which overlaps. As in the case of the mold clamping bolt screw hole 13, a female screw to which the mold clamping bolt 27 can be screwed is formed on the inner peripheral surface of each mold clamping bolt screw hole 33.

  A plurality of (three in the present embodiment) cooling water pipes 36 are formed in the cooling region CZ of the lower outer mold main body 31. Each cooling water pipe 36 is formed by a through-hole penetrating the cooling region CZ of the lower outer mold main body 31 in the left-right direction. Cooling water flows through the cooling water pipe 36. Thereby, the molten resin conveyed sequentially from the heating area HZ of the mold 1 for extrusion molding can be cooled and solidified.

  The lower middle mold 8 is a nesting that is fitted into a recess 31 a formed in the lower outer mold 7 with reference to FIGS. 4 and 5. The lower middle mold 8 is composed of a lower middle mold main body 41 that is formed in a block shape that is long in the front-rear direction and has a predetermined thickness in the vertical direction.

  With reference to FIG. 4, a plurality of mold clamping bolt through holes 43 (formed corresponding to the positions of the mold clamping bolts 27 in FIG. 3) are formed in the lower middle mold main body 41. Thirty-one clamping bolt through holes 43 are formed in the lower middle mold main body 41. Specifically, each mold clamping bolt through-hole 43 has the above-described mold clamping bolt screw hole 13 and each mold clamping bolt through-hole 23 in a state where the upper mold 3 and the lower mold 4 are clamped together. It is formed in the position which overlaps. Each of the clamping bolt through holes 43 is formed in a size that allows the clamping bolts 27 to be inserted, as in the case of the clamping bolt through holes 23.

  FIG. 7 is an enlarged view showing a part of FIG. 5 (near the cooling region CZ). Referring to FIG. 7, an inclined surface 47 is formed on the upper surface of lower middle mold 8. In FIG. 7, for the sake of convenience, the inclined surface 47 is illustrated so that the inclination angle is increased in order to make the drawing easier to see.

  The inclined surface 47 is formed in a portion of the upper surface of the lower middle mold 8 on the cooling region CZ side. The inclined surface 47 is gently inclined obliquely downward from the upstream side (rear side) to the downstream side (front side) in the cooling region CZ. Thereby, a gap G is formed between the upper mold 3 and the lower mold 4 in the cooling region CZ, more specifically, between the upper middle mold 6 and the lower middle mold 8. The gap G gradually increases from the upstream side (rear side) to the downstream side (front side) in the cooling region CZ.

[Configuration of each bolt]
The mold clamping bolt 27 is a bolt for clamping the extrusion mold 1. In the extrusion mold 1, the upper mold 3 is overlaid on the lower mold 4, and the mold clamping bolt screw holes 13, 33 and the clamping bolt through holes 23, 43 are overlapped in the vertical direction. As shown in FIG. 4, the bolts 27 are screwed together so as to straddle the clamping bolt screw holes 13 and 33.

  The surface pressure adjusting bolt 28 is a bolt for adjusting the surface pressure of the PL surface (die dividing surface) between the upper middle mold 6 and the lower middle mold 8 in the heating region HZ of the extrusion mold 1. Specifically, the surface pressure adjusting bolt 28 is formed in such a manner that the upper die 3 is overlaid on the lower die 4 and the surface pressure adjusting bolt screw hole 14 and the surface pressure adjusting bolt recess 24 overlap in the vertical direction. The tip end portion of the pressure adjusting bolt 28 is screwed into the surface pressure adjusting bolt screw hole 14 so as to press the surface pressure adjusting bolt recess 24. At this time, the surface pressure of the PL surface between the upper middle mold 6 and the lower middle mold 8 can be adjusted by adjusting the tightening degree of the surface pressure adjusting bolt 28.

  FIG. 8 is a diagram illustrating a state after the upper middle mold 6 is pressed by the pressing bolt 29 from the state illustrated in FIG. 7. 7 and 8, the pressing bolt 29 is for adjusting the width of the gap G by pressing and bending the upper middle die 6 downward. Specifically, the pressing bolt 29 is such that the upper die 3 is overlapped on the lower die 4 and the tip portion of the pressing bolt 29 is in a state where the pressing bolt screw hole 15 and the pressing bolt recess 25 overlap in the vertical direction. The press bolt screw hole 15 is screwed so as to press the press bolt recess 25. At this time, the width of the gap G can be adjusted by adjusting the tightening degree of the pressing bolt 29 and pressing and bending the upper middle die 6 downward (see FIG. 8). The reason for adjusting the width of the gap G in this way will be described in detail below along with the molding process of the long resin member 55.

[Configuration of resin passage]
A resin passage 18 is formed on the PL surface of the extrusion mold 1 (specifically, the lower surface of the upper mold 3 and the upper surface of the lower mold 4). The resin passage 18 includes an upstream resin passage 18a (see FIG. 4) formed by groove-shaped portions formed in the upper outer mold 5 and the lower outer mold 7, and a groove-shaped formed in the upper middle mold 6. And a downstream resin passage 18b (see FIGS. 5 and 6) configured by the portion and the upper surface of the lower middle mold 8.

  The upstream resin passage 18a includes the above-described extruder-side resin passage 20a and four branch passages (not shown) that branch from the downstream end of the extruder-side resin passage 20a.

  Referring to FIG. 6, four downstream resin passages 18b are formed in upper middle mold 6 and lower middle mold 8 in a state where upper mold 3 and lower mold 4 are clamped together. The upstream end of each downstream resin passage 18b communicates with the downstream end of each branch path of the upstream resin passage 18a. Thereby, after the molten resin extruded from the extruder 50 flows through the extruder-side resin passage 20a, it is branched into each branch path, and the molten resin flowing through each branch path communicates with the downstream end of each branch path. Will flow through each downstream resin passage 18b.

  The four downstream resin passages 18b are formed so as to extend in the front-rear direction at intervals in the left-right direction. Each of the downstream resin passages 18b is formed so that the cross-sectional shape of the long resin member 55 solidified while passing through the downstream resin passage 18b is substantially T-shaped as shown in FIG. Has been. Referring to FIG. 6, two pressing bolts 29a and 29a arranged in the front-rear direction are arranged correspondingly above the two downstream resin passages 18b and 18b arranged on the right side of the extrusion mold 1, Above the two downstream resin passages 18b, 18b arranged on the left side of the molding die 1, two pressing bolts 29b, 29b arranged in the front-rear direction are arranged correspondingly.

  Further, the surface of the inner peripheral surface of the resin passage 18 is formed to be smooth (that is, the unevenness is relatively small). A hard plating 18 c is applied to the inner peripheral surface of the resin passage 18. Thereby, the sliding resistance between the inner peripheral surface of the resin passage 18 and the resin passing through the resin passage 18 can be reduced.

[Molding process of long resin member]
1 to 8, in the extrusion mold 1 according to the present embodiment, the upper mold 3 and the lower mold 4 are clamped by the mold clamping bolts 27, and the upper middle mold 6 and the lower mold are clamped by the surface pressure adjusting bolts 28. After the surface pressure adjustment with the middle mold 8, the adjustment of the gap G by the pressing bolt 29, and other molding conditions (mold temperature, etc.) are appropriately set, the resin material M is pushed out by the extruder 50. The resin material M pushed out by the piston 51 passes through the upstream resin passage 18a (that is, the extruder-side resin passage 20a and the branch passage) while being heated and melted, and from the downstream end of each branch passage to each downstream side. It flows into the resin passage 18b.

  The molten resin that has flowed into each downstream resin passage 18b flows into the cooling zone CZ while being heated by a heating mechanism (not shown) provided in the heating zone HZ. In the upstream portion (surface solidification region) in the cooling region CZ, the molten resin is cooled by the cooling water flowing through the cooling water pipes 16 and 36, so that the surface portion of the molten resin flowing through the downstream resin passage 18b is solidified. The And in the downstream part (complete solidification area | region) in the cooling area | region CZ, the inside of resin is also solidified. Thereby, the long resin member 55 in a state where the surface and the inside of the resin are solidified is generated. The long resin member 55 generated in this manner is sequentially discharged from the resin passage outlet 19 to the outside of the mold.

[Adjustment of gap G]
By the way, the long resin member 55 produced | generated with the metal mold | die 1 for extrusion molding which concerns on this embodiment is what is called a profile extrusion molded product, and a shape is complicated compared with a round bar-shaped or plate-shaped extrusion molded product. Therefore, post-processing after extrusion molding is very difficult. That is, in the profile extrusion-molded product, the dimension and appearance properties obtained by extrusion molding become the product dimensions and appearance properties as they are.

  As described above, in order to obtain good dimensional accuracy and appearance quality, it is important to reduce the shrinkage when the molten resin is cooled and solidified, and in order to do so, the surface solidified region (in the resin passage 18). It is necessary to hold the pressure so that the internal resin pressure increases in the upstream portion of the cooling zone CZ.

  In this regard, in the extrusion mold 1 according to the present embodiment, the width of the gap G can be adjusted by adjusting the tightening amount of the pressing bolt 29. When the pressing bolt 29 is tightened in the state shown in FIG. 7, as shown in FIG. 8, the portion on the cooling region Z side (portion on the resin passage outlet side) in the upper middle mold 6 bends downward, and the gap G becomes narrower. As a result, the flow path in the upstream side of the cooling region CZ in the downstream resin passage 18b becomes narrow, and the sliding resistance between the surface solidified region portion in the downstream resin passage 18b and the long resin member 55 becomes large. Become. Thereby, it is possible to hold the pressure so that the internal resin pressure is increased in the surface solidified region. In this way, by adjusting the tightening amount of the pressing bolt 29 to adjust the width of the gap G, it is possible to generate the long resin member 55 having desired dimensional accuracy and appearance properties.

[effect]
As described above, in the extrusion molding die 1 according to the above-described embodiment, the molten resin extruded by the extruder 50 passes through the resin passage 18 and is provided on the downstream side of the resin passage 18. The long resin member 55 is formed by being cooled and solidified by the CZ. The long resin member 55 formed in this manner is sequentially discharged from the resin passage outlet 19 and cut into a desired length, whereby an extruded product is generated.

  Further, in the extrusion mold 1, a gap G is formed between the upper middle mold 6 and the lower middle mold 8 at the resin passage outlet 19 side portion of the resin passage 18, and the upper middle mold 6 is moved by the pressing bolt 29. By pressing the lower middle mold 8 side, the gap G on the downstream side of the cooling region CZ can be narrowed. When the gap G on the downstream side of the cooling region CZ is thus narrowed, the sliding resistance between the resin member passing through the downstream side (resin passage outlet 19 side) of the cooling region CZ and the resin passage 18 is increased. The internal resin pressure of the resin member passing through the upstream side of the cooling zone CZ (resin member whose surface is solidified and the inside is in a molten state) increases. If it does so, it can suppress that it shrinks | contracts large, when internal resin is cooled and solidified.

  According to the extrusion mold 1, it is not necessary to lengthen the resin passage in order to increase the sliding resistance between the long resin member 55 and the resin passage 18. High cost can be suppressed. Further, according to this configuration, the sliding resistance between the long resin member 55 and the resin passage 18 can be easily adjusted by adjusting the pressing amount of the upper die 3 by the pressing bolt 29.

  Therefore, the extrusion mold 1 is an extrusion mold that can form an extrusion-molded product having desired dimensional accuracy and appearance properties relatively easily, and is excellent in terms of cost and installation space. A molding die can be provided.

  Further, in the extrusion mold 1, the inclined surface 47 is formed on one of the upper mold 3 and the lower mold 4 (in the case of the present embodiment, the lower middle mold 8 of the lower mold 4). A gap G between the lower mold 4 and the lower mold 4 can be easily formed. In addition, according to this configuration, the upper middle mold 6 is pressed toward the lower middle mold 8 to bend the portion on the resin passage outlet 19 side in the upper middle mold 6, thereby forming a gap between the upper middle mold 6 and the lower middle mold 8. Easy to adjust.

  In the extrusion mold 1, the pressing portion for pressing the upper middle die 6 toward the lower middle die 8 is constituted by a bolt (pressing bolt 29). Therefore, the tightening amount of the pressing bolt 29 is adjusted. Thus, the sliding resistance between the long resin member 55 and the resin passage 18 can be easily adjusted.

  Further, according to the extrusion mold 1, the sliding resistance between the upstream portion of the resin passage 18 and the long resin member 55 can be reduced by the hard plating 18 c applied to the resin passage 18. Then, by increasing the sliding resistance on the downstream side in the resin passage 18 (the portion where the gap G is formed between the upper die 3 and the lower die 4 in the resin passage 18), the upstream side in the resin passage 18 is increased. The difference in sliding resistance between the portion and the downstream portion can be increased. Thus, by increasing the sliding resistance difference between the upstream portion and the downstream portion in the resin passage 18, the size adjustment range and the appearance property adjustment range of the long resin member 55 are expanded. Can do.

  Further, in the extrusion mold 1, the sliding resistance of the long resin member 55 traveling through each of the plurality of resin passages 18 is adjusted by individually adjusting the pressing amount of each pressing bolt 29 against the upper middle mold 6. Fine adjustment. Thereby, the dimensional accuracy and appearance property of each long resin member 55 can be finely adjusted individually.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, you may implement the following modifications.

  (1) FIG. 9 is a view of an extrusion molding die 1a according to a modification as viewed from above. FIG. 10 is a view of the extrusion mold 1a shown in FIG. 9 as viewed from below. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. FIG. 13 is an enlarged view of a portion VIII in FIG.

  In the above-described embodiment, the upper middle mold 6 is bent to narrow the flow passage cross section of the resin passage 18 through which the long resin member 55 passes, whereby the sliding between the long resin member 55 and the resin passage 18 is performed. Although dynamic resistance was adjusted and the dimensional accuracy and external appearance property of the elongate resin member 55 were adjusted, it is not restricted to this. In the extrusion mold 1a according to this modification, the upper middle mold 6a is divided into two, one is a fixed side upper middle mold 6b (fixed side part), and the other is a movable side upper middle mold 6c (movable side part), The movable upper middle mold 6c can be moved up and down relative to the fixed upper middle mold 6b. Then, the flow path cross section of the resin passage 18 is adjusted by moving the movable upper middle mold 6c up and down to the fixed upper middle mold 6b, and the sliding resistance between the long resin member 55 and the resin passage 18 is adjusted. ing. Below, the location from which the structure and operation | movement differ from the metal mold | die 1 for extrusion molding which concerns on embodiment mentioned above is demonstrated, and description is abbreviate | omitted about another location.

  An extrusion mold 1a according to this modification includes a mold body 2a having an upper mold 3a and a lower mold 4a. The upper mold 3a includes an upper outer mold 5 and an upper middle mold 6a, and the lower mold 4a includes Each has a lower outer mold 7a and a lower middle mold 8a. The extrusion mold 1a is different from the extrusion mold 1 according to the above-described embodiment in the configuration of the upper middle mold 6a, the lower outer mold 7a, and the lower middle mold 8a. The extrusion mold 1a includes an adjustment bolt 30 (protrusion).

  The lower middle mold 8a, like the lower middle mold 8 according to the above-described embodiment, is a nest that is fitted into the recess 31a formed in the lower outer mold 7a, and is long in the front-rear direction and has a predetermined thickness in the vertical direction. It is comprised by the lower middle type main-body part 41a formed in the block shape. A plurality of clamping bolt through-holes 43 are formed in the lower middle mold 8a, similarly to the lower middle mold 8 according to the above-described embodiment.

  Further, an adjustment bolt screw hole 48 is formed in the lower middle mold 8a. Twelve adjustment bolt screw holes 48 are formed in the cooling region CZ of the lower middle mold body 41a corresponding to the position of the adjustment bolt 30 shown in FIG. Specifically, the adjustment bolt screw hole 48 is a portion on the right side in the cooling region CZ of the lower middle mold main body portion 41a, a portion slightly on the right side of the central portion in the horizontal direction, and a portion on the left side of the central portion in the horizontal direction. A plurality (specifically, three) are formed at equal intervals in the front-rear direction in each of the left side portions. On the inner peripheral surface of each adjustment bolt screw hole 48, a female screw to which the adjustment bolt 30 can be screwed is formed.

  The adjustment bolt 30 is inserted and screwed into the adjustment bolt screw hole 48 described above from below. Specifically, the adjustment bolt 30 is inserted into the adjustment bolt screw hole 48 from below the lower outer die 7a through the adjustment bolt insertion through hole 37 formed in the lower outer die 7a. It is screwed into the screw hole 48. At this time, referring to FIG. 13, the adjustment bolt 30 is screwed into the adjustment bolt screw hole 48 so that the tip portion protrudes upward from the upper surface of the lower middle mold 8 a. The protruding amount d of the adjusting bolt 30 at this time can be adjusted by adjusting the tightening amount of the adjusting bolt 30.

  The upper middle mold 6a has a fixed-side upper middle mold 6b and a movable-side upper middle mold 6c with reference to FIG.

  The fixed-side upper middle mold 6b is a mold on the heating region HZ side in the upper middle mold 6a. The fixed-side upper middle die 6 b is pressed downward by the surface pressure adjusting bolt 28, and its lower surface is in close contact with the upper surface of the lower middle die 8. As a result, the fixed-side upper middle mold 6 b is fixed to the lower middle mold 8.

  The movable upper middle mold 6c is a mold provided separately from the fixed upper middle mold 6b, and is a mold on the cooling region CZ side in the upper middle mold 6a. The lower side of the movable-side upper middle mold 6c is supported by the tip portions of a plurality of adjustment bolts 30 fixed to the lower middle mold 8a.

  The movable upper middle mold 6c is pressed downward by the pressing bolt 29. That is, the movable upper middle die 6c is held in a state of being sandwiched between the tip ends of the plurality of adjustment bolts 30 fixed to the lower middle die 8a and the tip portions of the plurality of pressing bolts 29 fixed to the upper outer die 5. Is done. In this state, a gap G is formed between the movable upper middle mold 6c and the lower middle mold 8a. The gap G has substantially the same width in the front-rear direction. Further, the width of the gap G is determined by the protruding amount d of the adjustment bolt 30.

[Adjustment of gap G]
In the extrusion mold 1a according to the present modification, the adjustment of the gap G for adjusting the sliding resistance between the long resin member 55 and the resin passage 18 is performed as follows. Specifically, the gap G can be adjusted by adjusting the protruding amount d of the adjusting bolt 30 with reference to FIG.

  Further, in the extrusion mold 1a according to this modification, by adjusting the tightening amount of the pressing bolt 29, the pressure caused by the pinching between the movable upper middle mold 6c and the lower middle mold 8a can be adjusted. . Therefore, the sliding resistance between the long resin member 55 and the resin passage 18 can be finely adjusted by adjusting the pressure caused by the pinching.

[effect]
As described above, in the extrusion mold 1a according to this modification, the movable upper upper middle die 6c is moved in the vertical direction with respect to the fixed upper upper middle die 6b to adjust the gap G, thereby the embodiment described above. As in the case of the above, an extrusion mold capable of forming an extrusion-molded product having desired dimensional accuracy and appearance properties relatively easily, and having an excellent extrusion mold in terms of cost and installation space. Can be provided.

  Further, in the extrusion mold 1a, the movable upper middle mold 6c is pressed by the pressing bolt 29, whereby the gap G between the upper mold 3a and the lower mold 4a is reduced, and the long resin member 55 and the resin are formed. The sliding resistance between the passage 18 can be increased. In the extrusion mold 1a, the fixed upper middle mold 6b and the movable upper middle mold 6c are formed separately, so that the upper mold is bent as in the case where they are integrally formed, for example. Therefore, there is no need to make the gap small, so that an extrusion mold having excellent durability can be provided.

  Further, in the extrusion mold 1a, the width G of the gap G between the upper mold 3a and the lower mold 4a can be stabilized by the protruding amount d of the adjusting bolt 30, so that the long resin member 55 and the resin passage 18 are The sliding resistance between the two can also be stabilized. Further, according to the extrusion mold 1a, even when the extrusion mold 1a is disassembled and reassembled, the width of the gap G can be easily reproduced. Therefore, there are variations in dimensional accuracy and appearance properties for each lot. A small number of long resin members 55 can be produced.

  In the extrusion mold 1a, a bolt (adjustment bolt 30) is used as a protruding portion whose tip protrudes upward from the upper surface of the lower middle die 8 and contacts the lower surface of the movable upper middle die 6c. By adjusting the tightening amount, it is possible to easily adjust the protruding amount d of the adjusting bolt 30 with respect to the upper surface of the lower middle mold 8. Thereby, adjustment of the sliding resistance between the long resin member 55 and the resin passage 18 can be easily performed.

  In the present modification, the example in which the width of the gap G is substantially the same in the front-rear direction has been described, but the present invention is not limited to this. For example, as an example, the width of the gap G can be set to a different value in the front-rear direction by setting the tightening amounts of the pressing bolts 29 or the adjustment bolts 30 that are located apart in the front-rear direction to different values.

  (2) In the above-described embodiment, with reference to FIG. 6, one pressing bolt 29 is associated with the two resin passages 18 in the left-right direction. For example, if there is no problem of space limitation of the mold, one pressing bolt may correspond to each resin passage in the left-right direction. Thereby, the sliding resistance between the long resin member 55 and the resin passage 18 can be finely and finely adjusted.

  (3) In the modification described with reference to FIGS. 9 to 13, with reference to FIG. 12, one pressing bolt 29 is associated with the two resin passages 18 in the left-right direction, but this is not restrictive. For example, if there is no problem of space limitation of the mold, one pressing bolt may correspond to each resin passage in the left-right direction. Thereby, the sliding resistance between the elongate resin member 55 and the resin channel | path 18 can be finely finely adjusted like the case mentioned above.

  (4) In the modification described with reference to FIGS. 9 to 13, the example in which four downstream resin passages 18 b are formed in one movable-side upper middle mold 6 c has been described with reference to FIG. 12. Not limited to this. Specifically, for example, as an example, a plurality of movable upper middle molds elongated in the front-rear direction are provided in parallel in the left-right direction, a downstream resin passage is formed in each of the plurality of movable upper middle molds, and each movable upper middle mold One pressing bolt and one adjusting bolt may be provided. If it carries out like this, since a movable side upper middle mold | type can be independently moved for every downstream resin path, sliding resistance can be optimized for every downstream resin path.

  (5) In the above-described embodiment, the example in which the extrusion mold 1 according to the present embodiment is applied to a modified extrusion molded product has been described. However, the present invention is not limited to this, and an extruded molded product other than the modified extrusion molded product. (For example, it can be applied to a round bar or a plate-shaped molded product).

  (6) FIGS. 14A to 14C are longitudinal sectional views showing portions between the upper middle mold and the lower middle mold of the extrusion mold according to the modification. In the above-described embodiment, the inclined surface 47 of the lower middle mold 8 is formed so as to be gradually inclined from the center portion in the front-rear direction of the lower middle mold 8 to the front end portion of the lower middle mold 8. Absent. Specifically, as shown in FIG. 14A, the inclined surface 47a is formed so as to be gradually inclined from the central portion in the front-rear direction of the lower middle mold 8 to a portion slightly ahead of the portion. May be. Alternatively, in order to form a gap between the upper mold and the lower mold, for example, an R-shaped portion 47b as shown in FIG. A stepped portion 47c as shown in FIG. 14 (C) may be formed.

  (7) In the above-described embodiment, the example in which the inclined surface 47 is formed on the lower middle mold 8 has been described. However, the present invention is not limited to this, and the upper middle mold 6 may be formed.

  (8) In the above-described embodiment, the pressing portion for bending the upper middle mold 6 is configured by the pressing bolt 29. However, the present invention is not limited thereto, and any configuration can be used as long as the upper middle mold 6 can be bent downward. Such a configuration may be adopted. For example, as an example, a plurality of types of spacers having different thicknesses are prepared, a spacer having an appropriate thickness is selected from these spacers, and sandwiched between the upper and outer molds and the upper and middle molds. The amount of deflection may be adjusted.

  (9) In the embodiment described above, the extrusion mold having the upper mold and the lower mold having the nested structure has been described as an example. However, the present invention is not limited thereto, and the present invention is formed integrally with each other. It can also be applied to an extrusion mold having an upper mold and a lower mold.

  In this example, the dimensional accuracy and appearance properties of an extrusion-molded product molded in a state where the upper middle mold 6 was bent downward by a predetermined amount using the extrusion mold 1 according to the embodiment described above were evaluated. As a comparative example of the extrusion-molded product, an extrusion-molded product obtained by molding the upper middle die 6 without bending in the extrusion mold 1 was used. In the example, the tightening amount of the pressing bolt 29 was adjusted so that the gap G on the resin passage outlet 19 side when the upper middle mold 6 was bent was 0.4 mm. On the other hand, in the comparative example, the tightening amount of the pressing bolt 29 was adjusted so that the upper middle mold 6 was not bent and the gap G on the resin passage outlet 19 side was 1.0 mm.

[How to create a test piece]
Powdered ultra high molecular weight polyethylene (UHMW-PE) was used as the resin used as the raw material for the extruded product. Further, the temperature of the plasticizing cylinder 52 of the extruder 50 was set to about 170 ° C., and the temperature in the heating region HZ of the mold 1 was set to about 150 ° C. Under such conditions, the molten resin passes through the resin passage 18 in the mold 1 and is cooled and solidified by cooling water to form a long resin member 55 having a predetermined shape by about 300 m (an irregularly formed shape). did. A portion having a length of 1 m was randomly sampled from seven locations from the long resin member 55 molded in this manner to obtain a test piece 60 (see FIG. 15).

[Dimensional accuracy test method]
FIG. 15 is a cross-sectional perspective view schematically showing the shape of the test piece 60. In this test, in the cross section near the center in the length direction (front-rear direction) of each test piece 60 collected from seven locations, the dimensions at positions d1 to d5 are measured with a micrometer, and the average of the seven test pieces 60 is obtained. Values and standard deviations were calculated. It was determined that the closer the dimensions were to the target values and the smaller the standard deviation (= variation), the less the resin contracted and the better the dimensional accuracy.

[Test method of appearance properties]
The number of sinks 63 per 1 m of the test piece generated on the upper surface 61a of the protruding portion 61 of each test piece 60 and the lower surface 62 of each test piece 60 taken from seven locations is visually counted, and the average value of the seven test pieces is obtained. Was calculated. The smaller the number of sinks 63 per unit length of the test piece 70, the better the appearance properties.

[Dimension accuracy test results]
Table 1 is a table summarizing the dimension data of each test piece 60 according to the comparative example. Table 2 is a table summarizing the dimension data of each test piece 60 according to the example.

  In the comparative example in which the mold 1 was molded without bending, the dimensions of d1 to d5 of the seven test pieces deviated greatly from the target values, and the dimensional variation was large. On the other hand, in the Example which shape | molded the metal mold | die 1 by bending, it has confirmed that a dimension was very close to the target value and the dispersion | variation in a dimension was also small.

[External appearance test results]
Table 3 summarizes the number of sink marks 63 of each test piece 60 according to the comparative example. Table 4 is a table summarizing the number of sink marks 63 of each test piece 60 according to the example.

  In the comparative example in which the mold 1 was molded without bending, the number of generated sink marks 63 was large, and it was not acceptable as an appearance property of the product. On the other hand, in the example in which the mold 1 was bent and molded, the number of generated sink marks 63 was small, and a product acceptable as an appearance property of the product was obtained.

  From the above, by bending the mold 1 and narrowing the resin passage 18 on the downstream side of the cooling region CZ of the mold 1, the sliding resistance between the resin and the mold increases, and the extruded product (long shape) It was confirmed that the dimensional accuracy and appearance properties of the resin member 55) were greatly improved.

  The present invention can be widely applied to extrusion molds used when extruding long molded articles.

1, 1a Extrusion mold 3, 3a Upper mold 4, 4a Lower mold 18 Resin passage 19 Resin passage outlet 29 Pressing bolt (pressing part)
50 Extruder 55 Long resin member CZ Cooling zone HZ Heating zone G Gap

Claims (6)

A resin passage having an upper die and a lower die, in which the molten resin extruded by an extruder passes in a state where the upper die and the lower die are clamped to each other is formed, and the molten resin is cooled and the resin passage is cooled An extrusion mold in which a long resin member is formed by flowing out from the resin passage outlet formed at the downstream end of
The upper mold and the lower mold include a heating area that is an area where the molten resin extruded by the extruder is heated, and a cooling area where the molten resin is cooled after passing through the heating area. Including
A gap is formed between the upper mold and the lower mold in a portion of the resin path on the resin path outlet side,
In the cooling region, by pressing the upper mold to the lower mold side and narrowing the gap, a pressing section that reduces the passage cross section perpendicular to the longitudinal direction of the resin passage outlet side portion of the resin passage, further comprising a,
One of the upper mold and the lower mold is formed with an inclined surface in which the gap formed between the other is gradually increased along the traveling direction of the long resin member,
The pressing part presses the upper mold toward the lower mold side and bends a portion of the upper mold on the resin passage outlet side . In the extrusion mold according to claim 1 ,
The upper mold is
A lower mold of the upper mold, and an upper middle mold that forms the gap with the lower mold; and
An upper mold among the upper molds, an upper outer mold for holding the upper middle mold,
Have
The pressing portion is configured by a pressing bolt that is screwed into a screw hole formed in the upper and outer molds, and a tip portion protrudes downward from a lower surface of the upper and outer molds so that the upper and middle molds are moved to the lower mold side. A mold for extrusion molding, characterized in that the mold is pressed. A resin passage having an upper die and a lower die, in which the molten resin extruded by an extruder passes in a state where the upper die and the lower die are clamped to each other is formed, and the molten resin is cooled and the resin passage is cooled An extrusion mold in which a long resin member is formed by flowing out from the resin passage outlet formed at the downstream end of
The upper mold and the lower mold include a heating area that is an area where the molten resin extruded by the extruder is heated, and a cooling area where the molten resin is cooled after passing through the heating area. Including
A gap is formed between the upper mold and the lower mold in a portion of the resin path on the resin path outlet side,
In the cooling region, by pressing the upper mold to the lower mold side and narrowing the gap, a pressing section that reduces the passage cross section perpendicular to the longitudinal direction of the resin passage outlet side portion of the resin passage, further comprising a,
The upper mold is
A fixed part,
The resin passage outlet side portion provided as a member different from the fixed side portion, and having a movable side portion movable in the vertical direction with respect to the fixed side portion,
The pressing portion is configured to press the movable side portion and move the movable side portion to the lower mold side,
The extrusion mold is further provided with a protrusion fixed to the lower mold and having a tip protruding upward from the upper surface of the lower mold and abutting against the lower surface of the movable portion . Extrusion mold. In the extrusion mold according to claim 3 ,
The extrusion mold, wherein the protrusion is an adjustment bolt capable of adjusting an amount of protrusion of the tip with respect to the upper surface. In the extrusion mold according to any one of claims 1 to 4 ,
An extrusion mold, wherein the inner circumferential surface of the resin passage is hard-plated. In the mold for extrusion molding according to any one of claims 1 to 5 ,
A plurality of the resin passages are formed;
An extrusion mold, further comprising a plurality of the pressing portions arranged along an arrangement direction of the plurality of resin passages.

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