JP3967684B2 - Mold equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold apparatus.
[0002]
[Prior art]
Conventionally, in an injection molding machine, a resin as a molding material heated and melted in a heating cylinder of an injection apparatus is injected and filled into a cavity in a mold apparatus, and cooled in the cavity. A molded product is obtained by solidifying.
[0003]
The injection molding machine has a mold device, a mold clamping device, and an injection device. The mold apparatus includes a fixed mold and a movable mold, and the mold closing, mold clamping, and mold opening are performed by moving the movable mold forward and backward by the mold clamping apparatus. The injection device includes a heating cylinder and a screw that is rotatably and reciprocally disposed in the heating cylinder. Then, by advancing the screw, resin is injected from an injection nozzle attached to the front end of the heating cylinder, and the cavity is filled.
[0004]
By the way, in a hot runner mold apparatus, a heater is disposed in a manifold, a nozzle unit, etc. for supplying resin to the cavity, and the heater, nozzle runner, etc. formed in the manifold, nozzle unit, etc. The resin is heated. In this case, the resin in the runner, nozzle runner, etc. can be kept in a molten state.
[0005]
FIG. 2 is a sectional view of a conventional mold apparatus.
[0006]
In the figure, reference numeral 11 denotes a fixed mold, and the fixed mold 11 is attached to a fixed platen (not shown). A movable mold (not shown) is disposed to face the fixed mold 11, and the movable mold is attached to a movable platen (not shown). A mold apparatus is constituted by the fixed mold 11 and the movable mold, and a mold clamping apparatus (not shown) is operated to advance and retract the movable platen, thereby bringing the fixed mold 11 and the movable mold into contact with each other. The mold device can be closed, clamped and opened.
[0007]
The fixed mold 11 includes a cavity mold plate 15 disposed to face the movable mold, a manifold mold plate 17 disposed at a predetermined distance from the cavity mold plate 15, and the manifold mold. A platen side mold plate 18 is disposed at a predetermined distance from the plate 17. A nozzle unit 21 is disposed in the cavity template 15. The nozzle unit 21 includes a cylindrical chip body 22 that extends over the cavity mold plate 15 and has a rear end (right end in the figure) attached to the manifold mold plate 17. The chip body 22 is formed adjacent to the gate portion 25 formed at the front end portion (left end portion in the drawing), the cylindrical portion 26 formed adjacent to the gate portion 25, and the cylindrical portion 26. A flange portion 27 is provided.
[0008]
Also, the valve pin 38 extends over the cavity mold plate 15, the manifold mold plate 17, and the platen side mold plate 18, and the valve pin 38 passes through the chip body 22 so as to freely move forward and backward (movable in the left and right directions in the drawing). An annular nozzle runner 37 is formed between the tip body 22 and the valve pin 38, and an annular runner 35 is formed between the manifold mold plate 17 and the valve pin 38. The runner 35 is connected to a runner 36 extending in a direction perpendicular to the runner 35 at the approximate center of the manifold template 17.
[0009]
A gate port 39 for filling the cavity C with resin is formed at the front end (left end in the figure) of the nozzle unit 21, and the nozzle runner 37 is communicated with the cavity C through the gate port 39. The valve pin 38 is connected to a cylinder 41 serving as a valve opening / closing drive unit disposed in the platen side mold plate 18 so that a front end thereof faces the gate port 39 and is freely movable back and forth. The cylinder 41 is moved forward and backward by driving.
[0010]
The cylinder 41 includes a cylinder main body 42 and a piston 43 that is slidably movable in the cylinder main body 42, and a rear end of the valve pin 38 is fixed to the piston 43. In the cylinder body 42, a rear cylinder chamber 44 is formed behind the piston 43 (rightward in the drawing), and a front cylinder chamber 45 is formed forward (leftward in the drawing) of the piston 43, and the platen side template 18 is formed. The rear cylinder chamber 44 and the front cylinder chamber 45 are connected to each other to form flow paths (not shown), and each flow path is connected to a pressure fluid supply device including an air pump or a hydraulic pump via a control valve (not shown).
[0011]
Further, in order to heat the resin flowing in the nozzle runner 37, a heater h1 is disposed on the outer periphery of the cylindrical portion 26, and in order to heat the resin flowing in the runners 35 and 36, a heater h2 is disposed. .
[0012]
By the way, in order to fill the cavity C with resin, an injection device (not shown) is provided, and the resin is injected from the injection nozzle of the injection device. At this time, the valve pin 38 moves backward (moves in the right direction in the drawing). The gate port 39 is opened. The injected resin is sent to the nozzle runner 37 via the runners 35 and 36 and supplied to the cavity C via the gate port 39. Subsequently, the molded product can be obtained by cooling and solidifying the resin in the cavity C (see, for example, Patent Document 1).
[0013]
[Patent Document 1]
JP 2000-190357 A [0014]
[Problems to be solved by the invention]
However, in the conventional mold apparatus, since the valve pin 38 is disposed at the center of the runner 35, the resin flowing in the direction of the arrow a in the runner 36 is moved in the directions of the arrows b and c by the valve pin 38. Since they are diverted and merged in the runner 35 and flow through the nozzle runner 37 as they are, molding defects such as short, uneven thickness, air entrainment, weld, die mark, etc. occur.
[0015]
It is an object of the present invention to provide a mold apparatus that can solve the problems of the conventional mold apparatus and prevent the occurrence of molding defects.
[0016]
[Means for Solving the Problems]
For this purpose, in the mold apparatus of the present invention, the flow path for filling the cavity with the molding material and the flow path for the stationary mold in the flow path are arranged so as to be movable forward and backward, and the molding material is divided and joined. And a diverting member that forms a confluence, and a downstream side of the confluence in the flow direction of the molding material, and is attached to a fixed mold so as to surround the diversion member, and the merged molding material is agitated And a stirring and mixing member for mixing.
The stirring and mixing member stirs and mixes the molding material as it passes through the plurality of holes.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0025]
1 is a cross-sectional view of a mold apparatus according to the first embodiment of the present invention, FIG. 3 is a cross-sectional view of a filter element according to the first embodiment of the present invention, and FIG. 4 is a first embodiment of the present invention. It is sectional drawing which shows the principal part of the filter element in a form.
[0026]
In the figure, reference numeral 11 denotes a fixed mold as a first mold, and the fixed mold 11 is attached to a fixed platen as a first platen (not shown). A movable mold (not shown) as a second mold is disposed opposite to the fixed mold 11, and the movable mold is attached to a movable platen (not shown) as a second platen. The fixed mold 11 and the movable mold constitute a hot runner mold apparatus, and a mold clamping apparatus (not shown) is operated to advance and retract the movable platen to bring the fixed mold 11 and the movable mold into contact with and away from each other. Thus, mold closing, mold clamping and mold opening of the mold apparatus can be performed.
[0027]
The fixed mold 11 is disposed to face the movable mold, and is disposed at a predetermined distance from the cavity mold plate 15 including the cavity side plate 12 and the cavity plate support plate 13, and the cavity mold plate 15. And a platen side template 18 disposed at a predetermined distance from the manifold template 17. A nozzle unit 21 is disposed in the cavity template 15. The nozzle unit 21 includes a cylindrical chip body 22 that extends over the cavity mold plate 15 and has a rear end (right end in FIG. 1) attached to the manifold mold plate 17. The chip body 22 is formed adjacent to the gate portion 25 formed at the front end portion (left end portion in FIG. 1), the cylindrical portion 26 formed adjacent to the gate portion 25, and the cylindrical portion 26. Flanged portion 27 is provided.
[0028]
Further, the valve pin 38 extends over the cavity mold plate 15, the manifold mold plate 17, and the platen side mold plate 18, and the valve pin 38 extends and retracts (moves in the horizontal direction in FIG. 1) through the chip body 22. An annular nozzle runner 37 as a first flow path is formed between the tip body 22 and the valve pin 38, and an annular runner 35 is formed between the manifold mold plate 17 and the valve pin 38. The runner 35 is connected to a runner 36 extending in a direction perpendicular to the runner 35 at the approximate center of the manifold template 17. The runners 35 and 36 constitute a second flow path.
[0029]
A gate port 39 for filling the cavity C with resin as a molding material is formed at the front end (left end in FIG. 1) of the nozzle unit 21, and the nozzle runner 37 is communicated with the cavity C through the gate port 39. It is done. The valve pin 38 is connected to a cylinder 41 serving as a valve opening / closing drive unit disposed in the platen side mold plate 18 so that a front end thereof faces the gate port 39 and is freely movable back and forth. The cylinder 41 is moved forward and backward by driving.
[0030]
The cylinder 41 includes a cylinder main body 42 and a piston 43 slidably disposed in the cylinder main body 42, and a rear end of the valve pin 38 is fixed to the piston 43. In the cylinder body 42, a rear cylinder chamber 44 as a first cylinder chamber is located behind the piston 43 (rightward in FIG. 1), and a second cylinder chamber is located forward of the piston 43 (leftward in FIG. 1). A front cylinder chamber 45 is formed, and a flow path (not shown) is formed in the platen side mold plate 18 in communication with the rear cylinder chamber 44 and the front cylinder chamber 45, and each flow path is formed via a control valve (not shown). It is connected to a pressure fluid supply device including an air pump or a hydraulic pump. In the present embodiment, the cylinder 41 is used as a valve opening / closing drive unit, but an electric motor can be used instead of the cylinder 41.
[0031]
In order to heat the resin flowing in the nozzle runner 37, a heater h1 is disposed on the outer periphery of the cylindrical portion 26, and in order to heat the resin flowing in the runners 35 and 36, a heater h2 is disposed. The tubular portion 26 is embedded with a thermocouple 51 as a temperature detecting unit for detecting the temperature of the resin in the nozzle runner 37, and the sensor output of the thermocouple 51 is sent to a control unit (not shown). . The controller controls the energization of the heaters h1 and h2 based on the sensor output sent from the thermocouple 51.
[0032]
Further, when the gate control processing means of the control unit performs gate control processing, switches the control valve to supply the pressure fluid to the rear cylinder chamber 44, and discharges the pressure fluid in the front cylinder chamber 45, the piston 43 moves forward. (Move to the left in FIG. 1). Accordingly, the valve pin 38 is placed in the front closed position and closes the gate port 39. Therefore, the resin is not filled in the cavity C.
[0033]
Then, when the gate control processing means switches the control valve to supply the pressure fluid to the front cylinder chamber 45 and discharge the pressure fluid in the rear cylinder chamber 44, the piston 43 moves backward (moves in the right direction in FIG. 1). Be made. Along with this, the valve pin 38 is placed in the rear open position and opens the gate port 39. Therefore, the resin is filled in the cavity C.
[0034]
By the way, in order to fill the cavity C with resin, an injection device (not shown) is provided so that the resin can be injected from an injection nozzle of the injection device.
[0035]
Then, the injection processing means of the control unit performs injection processing, retracts the valve pin 38, opens the gate port 39, and injects resin from the injection nozzle, the resin passes through the runners 35 and 36. It is sent to the nozzle runner 37 and supplied to the cavity C through the gate port 39. Subsequently, by cooling and solidifying the resin in the cavity C, a molded product can be obtained.
[0036]
By the way, since the valve pin 38 is disposed at the center of the runner 35, the resin flowing in the direction of the arrow a is divided by the valve pin 38 at the portion where the runner 35 and the runner 36 are connected. It will be merged at the merge point pA. When the merged resin is sent to the nozzle runner 37 as it is, the boundary layer formed when the resin merges remains as it is, and when the resin with the remaining boundary layer is filled into the cavity C, short, uneven thickness, air Forming defects such as winding, welds, die marks, etc. occur. The valve pin 38 constitutes a diversion member for diverting and joining the resins.
[0037]
Therefore, in order to stir and mix the resin merged at the merge point pA in the runner 35, a filter element 52 as a stirring and mixing member is disposed downstream of the merge point pA in the resin flow direction. . The filter element 52 is disposed so as to surround a substantially intermediate portion in the axial direction of the valve pin 38, and is pressed against the manifold template 17 by a presser block 61 disposed so as to surround the filter element 52. It is incorporated in the template 17. Accordingly, the first storage portion 62 that stores the merged resin is formed inside the filter element 52, and the second storage portion 63 that stores the stirred and mixed resin is formed outside the filter element 52. .
[0038]
The filter element 52 includes a tubular portion 53 and a flange portion 54 formed to protrude radially outward at the rear end of the tubular portion 53, and the tubular portion 53 is formed at the front end. A through hole 55 for penetrating the valve pin 38 is formed, and a cylindrical wall portion 56 is formed as a hole portion having an inner diameter of 0.5 to 2.0 [mm] at a plurality of locations in the circumferential direction and the axial direction. Orifices 57 are formed in a matrix.
[0039]
Therefore, the resin in the first housing portion 62 is stirred and mixed while passing through the orifices 57, sent to the second housing portion 63, and further sent to the nozzle runner 37.
[0040]
In the present embodiment, the valve pin 38 has an outer diameter of 8 [mm], and the orifice 57 has an inner diameter of 1.0 [mm], so that 15 or more are formed. Each orifice 57 is expanded in the vicinity of the outer peripheral surface of the wall portion 56 so that the diameter increases toward the outer side in the radial direction, so that an expanded portion 58 is formed. Therefore, it is possible not only to suppress clogging of the resin in the orifice 57 but also to easily remove the clogged resin.
[0041]
Thus, even if the resin flowing in the direction of the arrow a is diverted and merged at the merge point pA, the merged resin is stirred and mixed while passing through the orifices 57 to be in a uniform state. Thus, since it is sent to the second accommodating portion 63 and further sent to the nozzle runner 37, it is possible to prevent the occurrence of molding defects such as short circuit, uneven thickness, air entrainment, weld, die mark and the like.
[0042]
Further, since the resin is diverted and agitated as it passes through each orifice 57, it generates heat generated by cutting. Therefore, since the resin forms a uniform molten state, the quality of the molded product can be improved. Moreover, as a molding material, for example, when using a mixture of a resin and an additive such as a colorant, or a mixture of a plurality of resins, kneading of the resin and additives, kneading of a plurality of resins, etc. It can be done well.
[0043]
Furthermore, when the resin passes through each orifice 57, foreign matters mixed in the resin can be blocked and captured by each orifice 57, so that the quality of the molded product can be further improved. it can.
[0044]
In the present embodiment, the filter element 52 is arranged in the manifold mold plate 17, but the filter element can also be arranged in the cavity mold plate 15.
[0045]
Next, a second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol, and the effect of the same embodiment is used about the effect of the invention by having the same structure. .
[0046]
FIG. 5 is a sectional view of a mold apparatus according to the second embodiment of the present invention, and FIG. 6 is a front view of a mixing element according to the second embodiment of the present invention.
[0047]
In this case, a mixing element 82 as a stirring and mixing member is disposed in the nozzle runner 37 as the first flow path in order to stir and mix the resin as the molding material that has joined at the joining point pA. The mixing element 82 is disposed so as to surround the front half portion (left half portion in FIG. 5) in the axial direction of the valve pin 38 as a flow dividing member, and is disposed in the vicinity of the front end (left end in FIG. 5). 83, and a cylindrical mixing portion 84 arranged to extend rearward (rightward in FIG. 6) from the mounting portion 83, and a through hole 87 for penetrating the valve pin 38 is formed. Then, a patterned unevenness for stirring and mixing the resin is formed on the outer peripheral surface of the mixing portion 84, and the unevenness is projected at a predetermined pitch on a line inclined with respect to the axial direction. The meandering flow path 86 is formed between the convex portions 85.
[0048]
Therefore, even if the resin flowing in the direction of arrow a in the runner 36 as the second flow path is diverted by the valve pin 38 and merged at the merge point pA, the merged resin is mixed with the mixing portion 84 and the cylindrical portion. 26, because it is agitated and mixed as it passes through the meandering flow path 86 between the inner peripheral surface of the 26 and becomes a uniform state, such as short, uneven thickness, air entrainment, weld, die mark, etc. Can be prevented.
[0049]
In the present embodiment, the cylinder 41 as the valve opening / closing drive unit includes a cylinder body 42 and a piston 43 slidably disposed in the cylinder body 42. A front end of the piston rod 71 projected forward (leftward in FIG. 5) and a rear end (right end in FIG. 5) of the valve pin 38 are connected via an adapter 72. In the cylinder main body 42, a rear cylinder chamber 44 as a first cylinder chamber is located behind the piston 43 (leftward in FIG. 5), and a front cylinder chamber 45 as a second cylinder chamber is located forward of the piston 43. The flow path 73, 74 is formed in the platen side mold plate 18 in communication with the rear cylinder chamber 44 and the front cylinder chamber 45, and the flow paths 73, 74 are formed through an air pump or a control valve (not shown). A pressure fluid supply device including a hydraulic pump is communicated.
[0050]
In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.
[0051]
【The invention's effect】
As described above in detail, according to the present invention, the flow path for filling the cavity with the molding material, and the flow path for the fixed mold are disposed in the flow path so that the molding material can be shunted. A flow dividing member that forms a merge point by joining together, and a molding material that is arranged and attached to a fixed mold so as to surround the flow dividing member on the downstream side of the merge point in the flow direction of the molding material And a stirring and mixing member for stirring and mixing.
The stirring and mixing member stirs and mixes the molding material as it passes through the plurality of holes.
[0052]
In this case, the stirring and mixing member is disposed downstream of the joining point in the flow direction of the molding material. Therefore, even if the flowing molding material is divided and joined, the joined molding material is not stirred. The mixture is agitated and mixed by the mixing member to become a uniform state. Therefore, it is possible to prevent the occurrence of molding defects such as shorts, uneven thickness, air entrainment, welds, die marks and the like.
[Brief description of the drawings]
FIG. 1 is a sectional view of a mold apparatus according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a conventional mold apparatus.
FIG. 3 is a cross-sectional view of the filter element according to the first embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a main part of the filter element according to the first embodiment of the present invention.
FIG. 5 is a sectional view of a mold apparatus according to a second embodiment of the present invention.
FIG. 6 is a front view of a mixing element according to a second embodiment of the present invention.
[Explanation of symbols]
11 Fixed mold 17 Manifold mold plate 21 Nozzle unit 35, 36 Runner 37 Nozzle runner 38 Valve pin 39 Gate port 52 Filter element 55 Through hole 57 Orifice 82 Mixing element C Cavity pA Junction point

Claims (7)

(A) a flow path for filling the cavity with the molding material;
(B) a flow-dividing member that is disposed in the flow path so as to be movable back and forth with respect to the fixed mold, divides the molding material, and merges to form a merging point;
(C) a stirring and mixing member that is disposed on the downstream side of the joining point in the flow direction of the molding material and is attached to a fixed mold so as to surround the flow dividing member, and stirs and mixes the joined molding material; and it has a,
(D) The mold apparatus, wherein the stirring and mixing member stirs and mixes the molding material as it passes through the plurality of holes . (A) a flow path for filling the cavity with the molding material;
(B) a flow-dividing member that is disposed in the flow path so as to be movable back and forth with respect to the fixed mold, divides the molding material, and merges to form a merging point;
(C) a stirring and mixing member that is disposed on the downstream side of the joining point in the flow direction of the molding material and is attached to a fixed mold so as to surround the flow dividing member, and stirs and mixes the joined molding material; And having
(D) The mold apparatus characterized in that the stirring and mixing member stirs and mixes the molding material as it passes through the meandering flow path between the convex portions formed on the outer peripheral surface. The flow path mold apparatus according to claim 1 or 2 is runners. 3. The mold apparatus according to claim 1, wherein the flow dividing member is a valve pin that is disposed so as to freely advance and retreat in the flow path and opens and closes a gate port. The mold apparatus according to claim 1 or 2 , wherein the flow path includes a first flow path formed in the nozzle unit and a second flow path formed in the manifold. The mold apparatus according to claim 5 , wherein the stirring and mixing member is disposed in the first flow path. The mold apparatus according to claim 5 , wherein the stirring and mixing member is disposed in the second flow path .

Images