JP6320056B2 - Mold equipment - Google Patents

Description

  The present invention relates to a mold apparatus used for a die casting method or an injection molding method (high pressure casting method), and more particularly to a mold apparatus including a slide core that forms a cavity by a fixed mold and a movable mold.

For example, the die-casting method known as mass production technology for molding a product by press-fitting molten metal (such as aluminum alloy or magnesium alloy) into a mold cavity cannot be formed by moving the movable and fixed molds in the mold opening / closing direction. A mold apparatus having a slide core (also referred to as a movable core or a drawing core) for forming an uneven portion (hereinafter referred to as an undercut portion) is used.
For example, a fixed mold, a movable mold that can be opened and closed (clamping and mold opening) with respect to the fixed mold, and a movable mold that can be moved forward and backward, and interlocked or driven by the movable mold opening and closing operation. There is known a mold apparatus in which a cavity is formed by a slide core for forming an undercut portion that moves forward and backward (see Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 5-169225 (see claims, paragraph 0013 and FIGS. 1 and 2) Japanese Patent Laid-Open No. 11-221657 (see the claims, paragraph 0011, FIG. 1 and the like)

In the die-casting method, a fixed and movable die-matching surface and a sliding surface of a sliding core (hereinafter referred to as “sliding core-side sliding surface”) are used for each cycle in which molten metal is press-fitted into a cavity to mold a product. ) And a mold-side by air blow that removes cast burrs generated when molten metal enters a slight gap between the mold-side sliding surface (hereinafter referred to as “mold-side sliding surface”). Cleaning is performed. At this time, the casting burr that remains attached to the area where the air blow sprayed from the automatic spray device (each air spray nozzle) carried by the robot between the fixed and movable molds in the mold open state is removed is removed. May not be removed in cast burrs that remain attached to locations where it is difficult to reach. One of them is a casting burr that has entered the back direction of the slide core side sliding surface and the mold side sliding surface (from the cavity toward the slide core retracting direction).
That is, since the fixed and movable mold-matching surfaces are exposed on the entire surface, air blow is easy to hit, and cast burrs generated on the mold-matching surfaces can be easily removed by air blow. The gap between the sliding surface on the sliding core side and the sliding surface on the mold side during retraction is narrow, making it difficult for air blow to reach, so in particular, cast burrs that remain attached to the back of both sliding surfaces may not be removed. .

The gap between the sliding surface on the slide core side and the sliding surface on the mold side during mold clamping is very narrow, and in a narrow space, the mold contact area (heat removal amount) with respect to the amount of molten metal (heat amount) entering is large. Since the molten metal quickly solidifies, when the molten metal is sprayed, it instantly solidifies in the form of a mist and becomes a powdery casting burr.
Powdered cast burrs are very small in particle size and are difficult to remove by air blow and may remain attached to both sliding surfaces.
Further, depending on the installation position of the slide core, the molten metal may invade continuously between both sliding surfaces, and a large and thin cast burr may be generated. The gap (interval) between both sliding surfaces when the slide core is retracted is narrow, and large thin burrs are difficult to be discharged and removed by air blow.

In this way, if the casting burr remains attached without being removed by air blow during mold cleaning, the casting burr will become more difficult when the casting burr is repeated several times, especially in the sliding core. The following problems occur due to gradual pressure lamination (fixed deposition) on the mold side sliding surface and the like.
There is a risk that cast burrs will gradually accumulate in the position where the advance limit (with the cavity forming core) is positioned relative to the cavity of the slide core, and the position accuracy of the slide core relative to the cavity will decrease, resulting in product dimensional defects. is there.
Further, when the cast burrs are concentrated and accumulated on a part, the force (pressure) of the core cylinder is concentrated on the part, and as a result, there is a risk of causing mold cracking or the like.
In addition, the movable / fixed mold clamping operation is hindered due to a decrease in the positional accuracy of the slide core, and the productivity is deteriorated due to the stop of casting.

  This invention makes it an example of a subject to cope with such a problem. That is, it is a mold apparatus equipped with a slide core, and dams the cast burr within a range in which the cast burr can be removed by air blow, and the powder is formed on the slide core side sliding surface and the mold side sliding surface. Preventing the flashing of the casting burr by preventing the casting burr from remaining by adhering to the casting burr by air blow, for example, by preventing the casting burr from adhering and remaining, and by making the casting burr easy to remove by air blow. Prevents degradation of positioning accuracy at the cavity advancement limit (the limit of cavity formation core), keeps the positioning accuracy, and prevents mold cracking due to stress concentration caused by some cast burrs. It is an object of the present invention to maintain the productivity by maintaining the positioning accuracy of the slide core and continuing the casting without obstructing the movable / fixed mold clamping operation.

In order to solve the above problems, a mold apparatus according to the present invention has at least the following configuration.
A stationary mold, a movable mold that can be opened and closed with respect to the stationary mold , and a slide core that can move forward and backward in a direction intersecting the opening and closing direction of the movable mold, the stationary mold, the movable mold, and the slide A cavity is formed by the core, and the slide core is a taper sliding surface on both sides of the sliding core side sliding surface and the mold side sliding surface which is widened toward the slide core in the retracting direction from the cavity. A mold apparatus that can be moved forward and backward by a plurality of recessed portions and a recessed peripheral plane portion on either or both of the tapered sliding surfaces on both sides, and the cavity is press-fitted and filled with molten metal. A cast burr damming portion for damming molten metal that has entered the gap between the movable mold side sliding surface of the movable mold and the sliding core side sliding surface of the slide core is provided. And

  It is preferable that the concave portion adopts a configuration in which one or both of the both-side tapered sliding surfaces are independently arranged from a predetermined position toward the slide core retracting direction from the product molding portion. Become.

According to such a configuration, the space between the taper sliding surfaces provided with the recesses is larger than the gap between the taper sliding surfaces not provided with the recesses, and the intrusion amount of the casting burr having the same volume is provided. If so, it will be difficult to reach the back. In addition, the molten metal that has entered the gap between the sliding surface on the slide core side and the sliding surface on the mold side is recessed from the front recess located on the cavity side toward the back direction (retracting direction of the slide core). Solidification is promoted in a narrow gap in the flat portion around the dent around each dent.
Further, the recess provided in the taper sliding surface has a larger space volume than the gap between the taper sliding surfaces not provided with the recess, and the mold contact area (heat removal amount) with respect to the molten metal amount (heat amount) is large. Since it is small, solidification of the molten metal is slow, and even if the casting burr is sprayed, the subsequent molten metal is filled before solidification, so that it becomes a cast burr having a uniform shape without being powdered.
In addition, the cast burr generated in each of the plurality of dents is formed into a thick part formed by the dents and a thin part formed by the peripheral peripheral plane part, and the thin parts are easily broken by air blow. The size is appropriate for removal by air blow.

  According to the mold apparatus of the present invention, the space between the taper sliding surfaces provided with the dents is larger than the gap between the taper sliding surfaces provided with no dents. If so, it will be difficult to reach the back. Thereby, since the casting burr can be dammed to a range that can be removed by air blow, it is possible to reliably remove the casting burr at the time of die cleaning by air blow performed every cycle in the die casting method.

  In addition, the molten metal is easy to enter continuously into the recess that is wider than the gap between the taper sliding surfaces during mold clamping, and it becomes a unified shape without being powdered, so it can be removed by air blow it can.

  In addition, the cast burr generated in each of the plurality of dents is formed into a thick part formed by the dents and a thin part formed by the peripheral peripheral plane part, and the thin parts are easily broken by air blow. It is formed in a size suitable for removal, and can be removed by air blow without being caught in the gap between the taper sliding surfaces when the slide core is retracted.

  Therefore, according to the present invention, it is possible to prevent a decrease in positioning accuracy at the cavity formation advance limit (with the cavity forming core entering limit) of the slide core caused by cast burr deposition and to achieve continuity of the positioning accuracy. . In addition, it prevents the deterioration of productivity due to the stoppage of casting due to the obstruction of the movable / fixed mold clamping operation due to the decrease in the position accuracy of the slide core, and cast burr accumulation (core clamping clamping stress concentration) It is possible to provide a mold apparatus including a slide core having a remarkable effect such as prevention of mold cracking due to the above.

In the metal mold apparatus concerning the embodiment of the present invention, it is an explanatory view showing roughly the clamping state of both fixed and movable molds. It is a front view when the movable mold | type of the same die apparatus is seen from the mold matching surface side, (a) shows the state which moved the slide core forward, (b) moved the slide core backward. Indicates the state. In the same mold apparatus, it is explanatory drawing which shows roughly the mold opening state of both fixed and movable type | molds. It is a front view when the slide core is viewed from the movable die-matching surface side. It is an expanded sectional view of the principal part which shows an example of the state by which the casting burr (molten metal) was dammed to the dent part of the casting burr damming part independently arrange | positioned on the taper sliding surface of the same slide core.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. The embodiment of the present invention includes the contents shown in the drawings, but is not limited thereto.
FIG. 1 is an explanatory view (vertical side view) schematically showing a mold clamping state of a mold apparatus according to an embodiment of the present invention, and FIG. 2 is a front view showing a movable mold of the mold apparatus. FIG. 3 is an explanatory view (vertical side view) schematically showing a mold opening state of the mold apparatus.

≪Description of mold device A≫
The mold apparatus A includes a fixed mold 1, a movable mold 2 that can be opened and closed (die opening / clamping) with respect to the fixed mold 1, and a slide core 3 that is incorporated in the movable mold 2 so as to be movable forward and backward. Are provided as main components. In the mold apparatus A, the cavity M for molding (casting) the product W having the undercut portion 4 in the mold opening direction of the movable mold 2 is formed by the fixed mold 1, the movable mold 2, and the slide core 3. It has a structure.

≪Description of fixed mold 1 and movable mold 2≫
The fixed mold 1 and the movable mold 2 are configured by a well-known mold structure (for example, a main mold and a nest). The movable mold 2 is a mold-matching surface (mold-divided surface) located at a portion where the undercut portion 4 of the product W around the movable mold-side product molding portion 5 in which the slide core 3 is incorporated so as to be movable back and forth. 6 is provided with a core installation concave portion 7 directed from the movable mold side product forming portion 5 toward the slide core retracting direction.
On the other hand, the fixed mold 1 has a core lock that engages with a stopper projection 17 to be described later of the slide core 3 when the slide core 3 moves to the forward limit and the mold clamping operation of the movable mold 2 is performed. The concave portion 8 is provided on the die matching surface 9 facing the core installation concave portion 7 on the movable mold 2 side.
Thereby, the slide core 3 moves to the forward limit, and when the mold clamping operation for the fixed mold 1 of the movable mold 2 is completed, the stopper convex portion 17 on the slide core 3 side engages with the core lock concave portion 8. Thus, the slide core 3 is fixed. That is, the slide core 3 is prevented from inadvertently moving in the backward direction due to the molten metal pressure (filling pressure) that is press-fitted into the cavity M.

  The fixed mold side product molding part 10 on the fixed mold 1 side is a concave mold, and the movable mold side product molding part 5 on the movable mold 2 side is a convex mold. Thereby, as shown in FIG. 3, the molded product W is fixed in a state where it is held by the movable mold side product molding portion 5 on the movable mold 2 side when both the fixed and movable molds 1 and 2 are opened. The mold is removed (detached) from the fixed mold side product molding portion 10 on the mold 1 side.

The core installation recess 7 is adapted to the cross-sectional shape of the slide core 3 formed in a block shape such as a rectangle in a cross-sectional view, for example, a U-shape in a plan view and a movable die 2 mold. Formed on the mating surface 6 from the slide core retracting direction toward the movable mold side product forming portion 5.
Then, both wall surfaces connected to the die-matching surface 6 of the core installation recess 7 become the movable mold-side sliding surface 11 that expands from the movable mold-side product molding section 5 toward the slide core retracting direction. . That is, as shown in FIG. 2, the core installation recess 7 is formed in a substantially vertically long trapezoidal shape downward when the movable mold 2 is viewed from the mold matching surface 6 side.

≪Description of slide core 3≫
FIG. 4 is a front view showing the slide core.
As is well known, the slide core 3 is incorporated and installed on the movable mold 2 side so as to be movable back and forth by a core pulling core plastic (such as a hydraulic cylinder) 12 installed in the slide core retraction direction on the movable mold 2 side. As a result, the movable mold 2 is moved forward toward the cavity M when the mold clamping operation is performed with respect to the fixed mold 1, and is followed by the mold opening operation of the movable mold 2 after the product W is formed (cast). Thus, the slide core is moved backward in the backward direction of the slide core.

This slide core 3 is provided with a slide core-side product molding portion 14 having an undercut molding portion 13 for molding the undercut portion 4 of the product W on the distal end side (cavity M insertion side). It is formed into a block shape such as a quadrangle or a rectangle when viewed.
The slide core 3 is provided with slide core-side sliding surfaces 15 corresponding to the both-side movable-type sliding surfaces 11 of the movable-type 2 core installation recess 7 on both sides, and on the movable-type 2 side. It is installed so as to be able to move forward and backward, and is formed so as to be connected and held to a rod tip of the core pull-out core plastic 12 via a shaft coupling member 16 called a coupling.
Further, when the slide core 3 moves to the forward limit, the slide core 3 includes a stopper convex portion 17 at a portion corresponding to the core lock concave portion 8 provided on the die mating surface 9 of the fixed die 1.

  The sliding core side sliding surface 15 on both sides of the sliding core 3 is fixed to the sliding core 3 toward the cavity M (the slide core side product molding portion 14 having the undercut molding portion 13 at the tip). In the state of moving to the movable mold side product molding parts 5 and 10 of the movable molds 1 and 2, they are in close contact with the movable mold side sliding surfaces 11 of the movable mold 2 side core installation recess 7 ( It is formed on both side surfaces of the slide core 3 at a close taper angle.

  The both-side slide core side sliding surface 15 of the slide core 3 formed in such a form is provided with a cast burr damming portion 18.

≪Description of cast burr damming part 18≫
When the molten metal is press-fitted into the cavity M (injection filling), the cast burr damming portion 18 slides on both sides of the slide core 3 on both sides of the slide core 3 and on both sides of the movable die 2 on the movable die side. The cast burr that has entered the gap (core advance / retreat clearance) 19 slightly present between the surface 11 and the surface 11 is blocked. As a result, a part of the molten metal that has entered the gap 19 is prevented from being generated as a casting burr in a wide range from the cavity M toward the slide core retracting direction.

The cast burr damming portion 18 is formed in a concave shape and a planar shape on the sliding core side sliding surface 15 on both sides of the sliding core 3.
Specifically, as shown in FIGS. 2 and 4, the cast burr damming portion 18 is directed from the slide core side product forming portion 14 of the slide core 3 toward the slide core retracting direction from a predetermined position. A plurality of dent portions 18a to 18d that are independently arranged on the slide core side sliding surface 15 on both sides of the slide core 3 at regular intervals, and dent peripheral plane portions 18e to 18i around the dent portions 18a to 18d. Formed from.

«Description of the recesses 18a to 18d»
As shown in FIGS. 1 and 3, the plurality of recesses 18 a to 18 d are circles having a predetermined recess depth and a predetermined recess depth in a direction orthogonal to the advancing / retreating operation direction of the slide core 3. It is formed in an arc shape (curved shape).

Then, in the plurality of recesses 18a to 18d arranged independently on the slide core side sliding surfaces 15 on both sides of the slide core 3 in this way, the slide core side product forming portion 14 reaches the slide core retracting direction side. As shown in FIGS. 1 and 4, the dimension L1 from the slide core side product forming portion 14 at the tip of the slide core 3 to a recess 18a in the slide core retraction direction is set to 15 to 30 mm. The thickness is preferably set to 15 to 20 mm.
Further, the maximum recess depth L2 from the movable type sliding surface 11 of each of the plurality of recesses 18a to 18d is set so that the slide core 3 moves backward as shown in FIG. 2 (b) and FIG. To a depth less than the expansion gap 30 between the movable mold side sliding surface 11 of the movable mold 2 and the slide core side sliding surface 15 of the slide core 3 which are expanded by the backward movement in the direction. It is preferable to set.
Moreover, it is suitable to set the width dimension L3 of the recessed peripheral plane part 18f-18h between the recessed parts 18a-18d shown in FIG.2 (b) to 1-20 mm, Preferably it is set to 5-10 mm.

[Description of operation]
Next, a die casting method using the mold apparatus A according to the present embodiment configured as described above will be described.
FIG. 5 is an enlarged cross-sectional view of a main part showing an example of a state in which a cast burr (molten metal) is blocked by the cast burr damming portion. Here, it demonstrates, referring suitably FIGS. 1-3.
When the mold clamping operation of the movable mold 2 with respect to the stationary mold 1 is started from the mold open state shown in FIG. 3 to the mold clamped state shown in FIG. 1, the slide core 3 is moved forward by the core pulling core plastic 12 and cut. The slide core side product forming portion 14 at the tip end having the forming portion 13 is matched with the movable mold side product forming portion 5 on the movable mold 2 side.
Then, when the mold clamping operation with the fixed mold 1 is completed by the continuous mold clamping operation of the movable mold 2, the slide core side product molding portion 14 of the slide core 3 becomes the fixed mold side product molding portion on the fixed mold 1 side. 10 is matched. Thus, the cavity M for forming (casting) the product W is formed by the fixed / movable molds 1 and 2 and the slide core 3.

When the cavity M is formed by completing the mold clamping of the movable mold 2 with respect to the fixed mold 1, the injection operation of a molten metal injection device (not shown) causes a pouring gate (casting port) 31 shown in FIG. The molten metal is press-fitted and filled. At this time, part of the molten metal press-fitted into the cavity M is formed between the movable mold side sliding surface 11 of the movable mold 2 (core installation recess 7) and the slide core side sliding surface 15 of the slide core 3. It penetrates (invades) into the slight gap 19 between them.
Then, the molten metal that has entered the gap 19 accumulates in the concave portion 18a via the first (first) concave peripheral plane portion 18e located on the cavity M side (lower side in FIG. 5), and from the concave portion 18a. The overflowing molten metal accumulates in the recessed portion 18b through the second recessed peripheral plane portion 18f, and is blocked by the recessed portion 18b (see FIG. 5). If the molten metal overflows from the second recess 18b, it accumulates in the recess 18c via the third recess peripheral plane 18g, and finally overflows from the third recess 18d. In such a case, it is blocked by the fourth concave peripheral plane portion 18h.
As a result, when the molten metal is press-fitted into the cavity M, it enters a slight gap 19 between the movable mold side sliding surface 11 of the movable mold 2 and the slide core side sliding surface 15 of the slide core 3. The molten metal is deposited and remains as cast burrs in a range where the air blow sprayed from the automatic spray device (each air spray nozzle) reaches, and is surely removed by air blow.
That is, the casting burr dammed to the casting burr damming portion 18 composed of the recessed portions 18a to 18d and the recessed peripheral plane portions 18e to 18i arranged independently on the sliding core side sliding surface 15 is shown in FIG. ), The movable mold side sliding surface 11 of the movable mold 2 and the slide core side sliding surface 15 of the slide core 3 expanded by the backward movement of the slide core 3 in the slide core retraction direction. Is blown away in the sliding core retreating direction from the widening gap 30 between the two and removed.

  Further, the casting burr dammed to the casting burr damming portion 18 composed of the recessed portions 18 a to 18 d and the recessed peripheral flat surface portions 18 e to 18 i independently arranged on the sliding core side sliding surface 15 increases the thickness of the gap 19. When connected with a thin cast burr, the thin cast burr is easily divided by air blow and is sized to be blown away by air blow, so that the slide core 3 moves backward in the slide core retraction direction. It is blown away in the sliding core retreating direction from the widening gap 30 between the widened movable side sliding surface 11 of the movable die 2 and the sliding core side sliding surface 15 of the slide core 3 and removed.

  When the press-fitting and filling of the molten metal into the cavity M is completed and the molten metal in the cavity M is cured (solidified) by a mold cooling device (not shown), the mold opening operation of the movable mold 2 starts. Then, immediately after the completion of the mold opening operation or after the mold opening is completed, or immediately after the mold opening is completed, the slide core 3 is moved backward in the slide core retracting direction by the core pulling core plastic 12, and the undercut portion of the product W 4, the undercut molding part 13 of the slide core 3 is pulled away.

  When the undercut molding section 13 is completely or completely separated from the undercut section 4, the product W is taken out by a product take-out device (not shown), and finally an automatic spray device (not shown) is fixed. -It is carried between the movable molds 1 and 2, and the movable mold side product molding part 5 of the fixed and movable molds 1 and 5, the fixed mold side product molding part 10 and the slide core side product molding part of the slide core 3. 14. Deposits such as cast burrs are blown off and removed from the die-matching surfaces (die-splitting surfaces) 6, 9. At this time, as described above, the casting burr dammed by the casting burr damming portion 18 is blown away from the casting burr damming portion 18 in the slide core retreating direction and removed. Then, the mold release agent is applied to the movable mold side product forming part 5, the fixed mold side product forming part 10, the slide core side product forming part 14 and the like, whereby one casting cycle is completed and the next casting is completed. Move to the shot.

As described above, according to the die casting method to which the mold apparatus A according to the present embodiment is applied, the movable mold side sliding surface 11 and the movable mold side sliding surface 11 of the movable mold 2 are sliding while the molten metal is press-fitted into the cavity M. The molten metal that has entered the slight gap 19 between the sliding core side sliding surfaces 15 of the core 3 is blocked by the cast burr damming portion 18, and the back side of the gap 19 (the sliding core retracting direction away from the cavity M). Can be prevented from entering.
As a result, since the casting burr is dammed to the extent that the casting burr can be removed by air blow, for example, it becomes possible to reliably remove the casting burr at the time of die cleaning by air blow performed every cycle in the die casting method. It is possible to prevent a decrease in positioning accuracy at the cavity formation advance limit (the cavity entry core entry limit) of the slide core 3 due to cast burr deposition and to achieve continuity thereof.

  Moreover, the casting burr | penetration which penetrate | invaded each recessed part 18a-18d of the casting burr dam stop part 18 has the volume corresponded to the dent depth L2 of each recessed part 18a-18d, and is with respect to the amount of molten metal (heat amount) which penetrate | invades. Because the mold contact area (heat removal amount) is small, the solidification of the molten metal is slow, and even if the casting burr is sprayed, the subsequent molten metal is filled before solidification, so it does not become a powder and becomes a coherent shape It can be easily removed by air blow, and it can also be expected to prevent deterioration of the product quality due to adhesion of fine powder cast burrs (cast burr).

The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. The embodiments described in the above drawings can be combined with each other as long as there is no particular contradiction or problem in the purpose and configuration. Moreover, the description content of each figure can become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.
For example, the cast burr damming portion 18 is not limited to the concave shape, and may be another shape. That is, when the molten metal is press-fitted into the cavity M, the molten metal that has entered the slight gap 19 between the movable mold side sliding surface 11 of the movable mold 2 and the slide core side sliding surface 15 of the slide core 3 has entered. However, the molten metal flow may be blocked so that it does not reach a wide range in the sliding core retreating direction. This convex shape or streak shape can be formed by overlaying by welding or the like and shaping by cutting. However, the cast burr damming portion provided in a convex shape or a streak shape must not have an undercut shape.

  Further, the cast burr damming portion 18 is provided on a part of the slide core side sliding surface 15 of the slide core 3 in a certain range, but is provided on the entire surface of the slide core side sliding surface 15. be able to. Moreover, the cast burr damming portion 18 can be provided on the movable mold side sliding surface 11 side of the core installation recess 7 of the movable mold 2.

  Further, the cast burr damming portion 18 can be provided on both the movable side sliding surface 11 of the core installation recess 7 and the slide core side sliding surface 15 of the slide core 3. In this case, the casting burr damming portion 18 on the movable mold side sliding surface 11 side does not correspond to the casting burr damming portion 18 on the slide core side sliding surface 15 side, and the slide core retreats from the cavity M side. In the direction toward the direction (advancing and retreating direction of the slide core 3), or the cast burr damming portion 18 on the movable side sliding surface 11 side in the state of the slide core advance limit position and It is preferable to have a positional relationship in which the concave peripheral plane portion between the cast burr damming portions 18 on the slide core side sliding surface 15 side contacts.

  Further, the cast burr damming portion 18 reduces the contact area between the sliding core-side sliding surface 15 of the sliding core 3 and the movable-type sliding surface 11 of the core installation recess 7 and increases the surface pressure. That is, the concave peripheral plane portions 18f to 18h located between the respective concave portions 18a to 18d that are independently disposed of the cast burr damming portion 18 and the concave peripheral flat portions 18e and 18i on both sides thereof are the core installation concave portions 7. It will contact | abut (press-contact) by the partial surface contact with respect to the movable type | mold side sliding surface 11, and the surface pressure of the said surface contact part will rise. Thereby, it becomes difficult to generate the gap 19 and it can be expected to prevent the intrusion of the casting burr.

  Deposits such as cast burrs remaining at the contact portion of the tapered sliding surface where the recesses 18a to 18d are not formed are scraped off by the recess peripheral plane portions 18f to 18h between the recesses 18a to 18d, and the recess 18a. It can also be expected to function as a cast burr recovery part that recovers to 18d. The powdered cast burrs scraped and collected in the cast burr damming portion 18 are taken into the molten metal filled in the cast burr damming portion at the next molten metal filling and are removed as thick cast burrs, or periodically. It is removed during maintenance of the mold.

A Mold device M Cavity W Product 1 Fixed mold 2 Movable mold 3 Slide core 4 Undercut part 5 Movable mold side product molding part 6, 9 Mold matching surface 10 Fixed mold side product molding part 11 Movable mold side sliding surface ( Tapered sliding surface)
14 Slide core side product molding part 15 Slide core side sliding surface (taper sliding surface)
18 Casting burr damming part 18a-18d Recessed part 18e-18i Peripheral flat part of a recessed part 19 Gap 30 Widening gap

Claims (2)

A fixed mold, a movable mold that can be opened and closed with respect to the fixed mold, and a slide core that can move forward and backward in a direction crossing the opening and closing direction of the movable mold,
A cavity is formed by the fixed mold, the movable mold, and the slide core,
A mold in which the slide core can be moved forward and backward by both side taper sliding surfaces of the sliding core side sliding surface and the mold side sliding surface which are widened toward the slide core in the retracting direction from the cavity. A device,
One or both of the taper sliding surfaces on both sides is formed of a plurality of recesses and a recess peripheral plane part, and when the molten metal is press-fitted into the cavity, the movable mold side sliding of the movable mold A mold apparatus comprising a cast burr damming portion for damming molten metal that has entered a gap between a surface and a sliding surface on a sliding core side of the sliding core .   The said recessed part is independently arrange | positioned from the predetermined | prescribed position toward a slide core retraction direction from the product formation part in either one or both of the said both sides taper sliding surface. Mold equipment.

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