JP2001071355A - Molding mold structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable automatic operation without deteriorating work efficiency and to curtail the material cost of a mold, a processing cost, a molding resin cost, etc., without increasing the thickness of a fixed side fitting plate. SOLUTION: In the molding mold structure, a plate side through hole part 4B which allows only the shaft part 16B of a stopper member 16 to pass through and a back facing part 45 into which a plate receiving part 16B is inserted are formed in a runner stripper plate 4, the stopper member 16 is made to penetrate the through hole part 4B, its shaft part 16A is fitted to the stopper member 16, when a mold is opened, the receiving part 16B is inserted into the back facing part 45, the plate 4 is received, and a piece 10 is positioned outside a runner gate removing range C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die structure for plastic molding, which comprises three cavities and a core plate for forming a product shape and a runner stripper plate for peeling off a runner. The part is configured, and the runner is placed on another plane separately from the mold parting line, and when the mold is opened after molding the product, this face is opened and the runner, gate, sprue is taken out by the machine. The present invention relates to a pin point gate type mold die structure to be taken out.

[0002]

2. Description of the Related Art As a conventional mold mold structure of this kind, a runner arranged on another plane is separated from a parting line of a mold by a molten metal injected from a nozzle of an injection molding machine at the time of product molding. The resin is bitten by the runner lock bin in the process of cooling and hardening, and when the mold is opened, the gap between the fixed side mounting plate and the runner stripper plate for peeling the runner is opened by, for example, about 5 mm, so that the resin is bitten by the runner lock pin. A method of removing a runner attached thereto and removing a runner, a gate, and a sprue detached from a runner lock pin by a take-out machine is generally adopted.

That is, the conventional mold structure has a fixed mold portion 61 and a movable mold portion 62 as shown in FIGS. 7 and 8, and the fixed mold portion 61 includes a fixed side mounting plate 63,
It has a runner stripper plate 64 and a fixed side mold plate 65, and a support pin 66 is attached to the fixed side mounting plate 63. When the mold is opened after the product is formed, the runner stripper plate 64 and the fixed side mold plate 65 are fixed. The template 65 slides while being guided by the support pins 66, and includes a runner stripper plate 64 and a fixed-side template 65.
The guide bushes 67A and 67B provided on the support pins 66 are in sliding contact with the support pins 66.

A locating ring 67 into which a nozzle (not shown) of an injection molding machine (not shown) is inserted is mounted at the center of the fixed side mounting plate 63, and a molten resin is injected below the locating ring 67. The sprue bush 68 is attached to the fixed side mold plate 6. The sprue bush 68 is guided by a sprue bush guide 69 attached to the runner stripper plate 64 in a mold closed state.
5 and runners 70 arranged on the upper surface.

[0005] A mounting piece 71 for forming a product shape is mounted on the fixed side mounting plate 63, and the mounting piece 71 is slidably penetrated through the runner stripper plate 64 and inserted into the cavity forming member 72. I have.

The fixed mounting plate 63 has a counterbore 7
3 and the through hole 74 are formed concentrically. A stop bolt 75 penetrates the through hole 74, and the stop bolt 75 is attached to the runner stripper plate 64.

Further, the runner 70 disposed on the upper surface of the fixed mold plate 65 is made to bite into the fixed mounting plate 63 in the process of cooling and hardening the molten resin injected from the nozzle of the injection molding machine at the time of molding the product. Runner lock pin 76 for
Is attached, and when the mold is opened after molding, runner 7
Since the runner lock pin 76 bites the gate 77 opened to the zero and fixed side template 65, the gap between the runner stripper plate 64 and the fixed side template 65 is opened when the mold is opened. , Fixed side template 6
Pulled out of 5.

[0008]

However, in the case where the insert piece 71 forming the product shape is attached to the fixed mounting plate 63 and the insert piece 71 is inserted into the cavity, the insert piece 71 is fixed to the fixed mounting plate 63. 63 to the cavity forming member 72
, The length of the insert piece 71 becomes longer, and when the mold is opened after the product is formed, the fixed-side mounting plate 64 is opened.
And runner stripper plate 64 for peeling runners
For example, when the opening is opened by about 5 mm, as shown in FIG. 8, the insertion piece 71 enters the runner / gate take-out range C and interferes with the take-out machine, so that the runner 70, the gate 77, and the sprue are taken out by the take-out machine. However, since the unloader cannot be used, there is a problem that not only the work efficiency is remarkably reduced but also the automatic operation becomes impossible.

In the structure in which the stop bolt 75 is mounted from the fixed side mounting plate 63 to the runner stripper plate 64, means for increasing the amount of opening between the fixed side mounting plate 63 and the runner stripper plate 64 includes:
A structure in which the thickness of the fixed-side mounting plate 63 is increased is conceivable. However, in a structure in which the thickness of the fixed-side mounting plate 63 is increased, material costs, processing costs, molding resin costs, and the like of the mold increase. There was a problem.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to enable automatic operation without lowering work efficiency, and to reduce the thickness of the fixed-side mounting plate. Without thickening the mold material cost,
An object of the present invention is to provide a mold structure capable of reducing processing costs, molding resin costs, and the like.

[0011]

According to a first aspect of the present invention, there is provided a mold structure having a fixed mold portion and a movable mold portion, wherein a mold is formed. The mold part,
Consists of a fixed-side mounting plate, a runner stripper plate for peeling off runners, and a fixed-side mold plate that forms a cavity together with a fixed mold part, and fixes an insert piece that forms part of the cavity on the parting line of the mold. Attached to the side mounting plate, a runner is placed between the runner stripper plate and the fixed mold plate, and when the mold is opened after forming the product, the space between the runner stripper plate and the fixed mold plate is opened, and the runner etc. A mold die structure for setting a runner gate take-out range for taking out by a take-out machine,
At the time of opening the mold, a large opening is provided between the fixed side mounting plate and the runner stripper plate to provide an opening-enlarging means for positioning the inserted piece outside the runner / gate take-out range.

[0012] With this configuration, when the mold is opened, a large amount of opening between the fixed-side mounting plate and the runner stripper plate is taken by the opening enlarging means so that the insert piece can be opened.
It can be located outside the gate removal range. For this reason, the unloader can take out runners (runners, gates, sprues) by this unloader without interfering with the insertion piece, and automatic operation can be performed without lowering work efficiency. it can. In addition, since the thickness of the fixed side mounting plate is not increased, material costs of the mold,
Costs such as processing costs and molding resin costs can be reduced.

According to a second aspect of the present invention, there is provided a mold die structure according to the first aspect of the present invention, wherein the opening degree expanding means is provided on the fixed side mounting plate. A stopper member having a plate receiving portion is attached, and when the mold is opened, the runner stripper plate is received by the plate receiving portion of the stopper member, and the insertion piece is positioned outside the runner / gate removal range. It is.

With this configuration, when the mold is opened, the runner stripper plate is received by the plate receiving portion of the stopper member, and a large amount of opening is provided between the fixed side mounting plate and the runner stripper plate. Pieces can be positioned outside the runner gate removal area. For this reason, the unloader does not interfere with the insertion piece, and the unloader uses the unloader to runners (runners, gates, sprues).
Can be taken out without reducing the work efficiency,
Automatic driving can be enabled. Further, since the thickness of the fixed-side mounting plate is not increased, costs such as material costs, processing costs, and molding resin costs of the mold can be reduced.

According to a third aspect of the present invention, there is provided a mold die structure according to the second aspect of the present invention, wherein a stopper member is provided on a tip end side of the shaft portion. The runner stripper plate is provided with a receiving portion, and a plate-side through hole for passing only the shaft portion of the stopper member and a counterbore portion for inserting the plate receiving portion are provided on the runner stripper plate. The shaft portion of this stopper member is attached to the fixed side mounting plate by penetrating the member, and the plate receiving portion is inserted into the counterbore portion to receive the runner stripper plate when the mold is opened. .

With this configuration, when opening the mold, the plate receiving portion is inserted into the counterbore portion to receive the runner stripper plate, and a large amount of opening between the fixed-side mounting plate and the runner stripper plate is taken. This allows the inserted piece to be positioned outside the runner / gate take-out range.
For this reason, the unloader can take out runners (runners, gates, sprues) by this unloader without interfering with the insertion piece, and automatic operation can be performed without lowering work efficiency. it can. Further, since the thickness of the fixed-side mounting plate is not increased, costs such as material costs, processing costs, and molding resin costs of the mold can be reduced.

According to a fourth aspect of the present invention, there is provided a mold die structure according to the first aspect of the present invention, wherein the opening enlarging means is provided with a fixed side mounting plate. The runner stripper plate is connected to the runner stripper plate by a link mechanism, and when the mold is opened, the link mechanism is opened and the runner stripper plate is hung so that the insertion piece is positioned outside the runner / gate removal range.

With this configuration, when the mold is opened, the link mechanism is opened, the runner stripper plate is hung, and the opening between the fixed-side mounting plate and the runner stripper plate is increased in a large amount. Can be located outside the runner gate removal range. For this reason, the unloader can take out runners (runners, gates, sprues) by this unloader without interfering with the insertion piece, and automatic operation can be performed without lowering work efficiency. it can. Further, since the thickness of the fixed-side mounting plate is not increased, costs such as material costs, processing costs, and molding resin costs of the mold can be reduced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. Note that an injection molding machine (not shown) will be described as an example using a known injection molding machine.

The mold structure according to the present invention includes a fixed mold portion 1 and a movable mold portion 2. The fixed mold portion 1 includes a fixed-side mounting plate 3, a runner stripper plate 4, and a fixed-side mold. A support pin 19 is attached to the fixed-side mounting plate 3. When the mold is opened after the product is formed, the runner stripper plate 4 and the fixed-side template 5 are connected to the support pin 19. The runner stripper plate 4 and the fixed mold plate 5
The guide bushes 20 </ b> A and 20 </ b> B provided on the support pins 19 are in sliding contact with the support pins 19.

A locating ring 6 into which a nozzle (not shown) of an injection molding machine (not shown) is inserted is mounted at the center of the fixed side mounting plate 3, and molten resin is injected below the locating ring 6. The sprue bush 7 is mounted, and the sprue bush 7 is guided by a sprue bush guide 8 attached to the runner stripper plate 4 in a mold closed state, and communicates with a runner 9 arranged on the upper surface of the fixed side mold plate 5. .

A mounting piece 10 for forming a product shape is mounted on the fixed-side mounting plate 3, and the mounting piece 10 slidably penetrates a hole 4A provided in the runner stripper plate 4 to allow the product to slide. It is inserted into the cavity forming member 11 forming the shape. And the cavity forming member 1
1 is fixed to the fixed side mold plate 5 by a rotation prevention key 12 which also serves as a rotation prevention key and a rotation prevention key.

The fixed mounting plate 3 is arranged on the upper surface of the fixed mold plate 5 in the process of cooling and hardening the molten resin injected from a nozzle (not shown) of an injection molding machine (not shown) during product molding. A runner lock pin 15 is attached to the runner 9 to bite the runner 9, and the gate 14 opened on the runner 9 and the fixed-side mold plate 5 is used when the mold is opened after the product is formed. When the mold is opened, the gap between the runner stripper plate 4 and the fixed mold plate 5 is opened, and the mold is pulled out from the fixed mold plate 5.

The opening enlarging means for increasing the amount of opening between the fixed-side mounting plate 3 and the runner stripper plate 4 is provided with a stopper member 16 which is provided on the distal end side of the shaft portion 16A. The stopper 16B is provided. Also, the stopper member 1 is provided on the fixed mold plate 5.
6 is provided with a template side through-hole portion 5B for passing the plate receiving portion 16B. The runner stripper plate 4 has a plate side through hole portion 4B for passing only the shaft portion 16A of the stopper member 16 and a plate receiving portion. A counterbore 45 into which the portion 16B is inserted is provided.

The stopper member 16 is passed through the template side through hole 5B and the plate side through hole 4B, and the shaft 16A of the stopper member 16 is mounted on the fixed side mounting plate 3. Therefore, at the time of opening the mold, the plate receiving portion 16B is inserted into the counterbore portion 45 to receive the runner stripper plate 4, and the opening between the fixed-side mounting plate 3 and the runner stripper plate 4 is increased. Thus, the insertion piece 10 can be positioned outside the runner / gate take-out range C.

Further, a puller bolt 18 for controlling an opening amount between the run stripper plate 4 and the fixed side template 5 is provided.
Are attached to the runner stripper plate 4 while penetrating through the through-hole 5A provided in the fixed mold plate 5.

The movable mold part 2 includes a movable mounting plate 21, a spacer block 22, a receiving plate 23, and a movable mold plate 24.
And a first ejector plate 33 serving as an ejector means.
And a second ejector plate 34, and the movable side mounting plate 21 includes a spacer block 22, a receiving plate 23
The movable mold plate 24 is fixed by mounting bolts 25.

The spacer block 22, the receiving plate 23
The movable mold plate 24 has relief holes 22A, 23A, and 24A for the puller bolt 18, and the puller bolt 18 is inserted into the relief holes 22A, 23A, and 24A. Further, relief holes 21B, 22B, 23B, 24B of the support pins 19 are formed in the movable mounting plate 21, the spacer 7 lock 22, the receiving plate 23, and the movable mold plate 24, and these relief holes are formed. 21B, 22B, 23
Support pins 19 are inserted into B and 24B. Also,
A rod insertion hole 28 into which an ejector rod 27 of the injection molding machine is inserted is opened at the center of the movable-side mounting plate 21.

The movable side mold plate 24 is provided with a core 29 formed by engraving a shape portion forming a product shape to form a product shape. The core 29 is fixed to the receiving plate 23 by mounting bolts 30.

When the mold is opened after the product is formed (see FIG. 2), the movable mold 24 has a parting line AA line between the fixed mold 5 and the movable mold 24. A parting lock 40 for locking the
The fixed side template 5 is provided with a parting lock hole 41 into which the parting lock 40 is inserted.

A return pin 31 and an ejector pin 32 are slidably inserted into the receiving plate 23 and the movable mold plate 24, respectively, and between the movable mounting plate 21 and the receiving plate 23. A first ejector plate 33 and a second ejector plate 34 are accommodated in the space, and the first ejector plate 33 and the second ejector plate 34 are connected to each other by mounting bolts 35, and The ejector plate 33 and the second ejector plate 34 include the return pin 31 and the ejector pin 3.
2 sandwiches the flanges 31a and 32a at the base end, and these constitute ejector means.

Next, the molded product (product) 200 shown in FIG. 6 is formed from the molded product (product) 200 shown in FIG. The process up to gate removal will be described.

When the molded product 200 shown in FIG. 6 is molded by using the mold structure having the above-described structure, the movable mold part 2 attached to an injection molding machine (not shown) is used.
Is raised to match the fixed mold part 1, the mold is closed as shown in FIG. 1. In this state, a molten resin is injected into the mold from a nozzle (not shown) of the injection molding machine to form the molded product 20.
0 is molded.

The molten resin injected from the nozzle of the injection molding machine is supplied to a sprue bush 7 below the locate ring 6 attached to the center of the fixed mounting plate 3 as shown in FIG.
Through the runner 9 arranged on the upper surface of the fixed mold 5, the gate 14 opened in the fixed mold 5, and into the cavity forming member 11 of the fixed mold 1 and the cavity forming member 11. It is injected into the cavity, which is a space formed by the inserted insert 10, the core 29 forming the product shape of the movable mold 2 and the product shape engraved on the movable mold 24, and is injected. The molded product 200 is formed by cooling and curing the molten resin (see (1) in FIG. 3).

In the process of cooling and hardening the injected molten resin, the runner 9 disposed on the upper surface of the fixed mold plate 5 is in a state of biting the runner lock pin 15.

When the mold is opened after the molding of the product, the mold is opened by lowering the movable mold portion 2 after cooling and curing of the molten resin. At this time, the fixed mold plate, which is the parting line AA, is opened. 5 and the movable mold plate 24 are provided with a locking lock 40 attached to the movable mold plate 24 and a
As the movable mold part 2 is lowered, the space between the fixed mold plate 5 and the runner stripper plate 4 is opened by the movable mold part 2 being lowered,
As a result, the runner 9 biting the runner lock pin 15 and the gate 14 opened on the fixed side template 5 are pulled out from the fixed side template 5.

The movable mold portion 2 and the fixed mold plate 5 locked to the movable mold plate 24 are connected to a puller bolt 18 for controlling an opening amount between the fixed mold plate 5 and the runner stripper plate 4. The opening of the mold between the fixed mold plate 5 and the runner stripper plate 4 is completed when the lower flange 18a and the lower surface of the fixed mold plate 3 are fitted together.

When the movable mold part 2 is further lowered, the space between the fixed mounting plate 3 and the runner stripper plate 4 is opened. At this time, the opening between the fixed mounting plate 3 and the runner stripper plate 4 is opened. The opening between the fixed side mounting plate 3 and the runner stripper plate 4 can be made large by the depth of the stopper member 16 and the counterbore portion 45 configured as an opening degree enlarging means for taking a large amount. When the plate receiving portion 16B and the counterbore portion 45 are fitted together, the fixed-side mounting plate 3 and the runner stripper plate 4
The mold opening between them is completed. At this time, the insertion piece 10 for forming the product shape attached to the fixed-side mounting plate 3 has a large opening amount between the fixed-side mounting plate 3 and the runner stripper plate 4 so that the runner / gate taking-out range C It stops in the runner stripper plate 4 which is a position deviated from the position.

In this case, as shown in FIG. 3 (2), the product forming portion 10 A of the insert piece 10 is
The space between the claws 201 is removed from the space.

The movable part 2 locked by the parting lock 40 and the parting lock hole 41.
The fixed mold plate 5 is separated from the fixed mold plate 5 by lowering the movable mold portion 2 further.
A is opened, and the mold is opened as shown in FIG. 2. Next, the ejector rod 27 of the injection molding machine is used as ejector means.
After the ejector rod 27 is inserted into the rod insertion hole 28 of the movable side mounting plate 21, the return pin 31 and the ejector pin 32 are pushed up via the first ejector plate 33 and the second ejector plate 34, The mold 200 is released by extruding (see (3) and (4) in FIG. 3).

Next, the runner 9, the gate 14, and the sprue are taken out of the mold by the take-out machine, thereby completing the process from the molding of the molded product 200 to the release of the molded product after molding, the runner, and the removal of the gate. In this case, the runner 9, the gate 14, and the sprue can be taken out by the take-out machine without interfering with the loading piece 10.

FIGS. 4 and 5 show another embodiment of the opening enlargement means capable of increasing the amount of opening between the fixed mounting plate 3 and the runner stripper plate 4. FIG.

The opening expansion means is constituted by a link mechanism M. That is, the opening enlargement means has a link 51 and a link 52, and the link 51 and the link 52 are connected to each other at their distal ends by the pins 54, and the base end of the link 51 is A pin 53A is connected to the side surface of the fixed-side mounting plate 3, and the base end of the link 52 is connected to the side surface of each template of the runner stripper plate 4 by a pin 53A.
B linked.

When opening between the fixed mounting plate 3 and the runner stripper plate 4 in opening the mold after the product is formed, the links 51 and 52 are connected to the pins 53A and 53B as shown in FIG. Rotates while being supported by the link 5
The opening of the mold between the fixed-side mounting plate 3 and the runner stripper plate 4 is completed by the opening of the link 1 and the link 52 by the maximum amount. Thereby, a large opening amount between the fixed-side mounting plate 3 and the runner stripper plate 4 can be obtained.

[0045]

As described above, according to the mold structure of the present invention, when the mold is opened, the amount of opening between the fixed mounting plate and the runner stripper plate is increased by the opening expansion means. , The inserted piece can be positioned outside the runner gate take-out range. For this reason, the unloader can take out runners (runners, gates, sprues) by this unloader without interfering with the insertion piece, and automatic operation can be performed without lowering work efficiency. it can. In addition, since the thickness of the fixed-side mounting plate is not increased, material costs, processing costs,
Costs such as molding resin costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a mold mold structure according to the present invention in a mold closed state.

FIG. 2 is a vertical cross-sectional view of the same mold structure in an open state.

FIGS. 3 (1) to (4) are explanatory diagrams of a molding step of a molded product in the same mold structure.

FIG. 4 is a vertical cross-sectional view of the opening degree enlarging means in a closed state in the mold structure.

FIG. 5 is a longitudinal sectional view of the opening degree expanding means in an open state.

FIG. 6 is a front view of a molded product.

FIG. 7 is a longitudinal sectional view of a conventional mold structure in a closed state.

FIG. 8 is a longitudinal sectional view of the same mold structure in an open state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed type part 2 Movable type part 3 Fixed side mounting plate 4 Runner stripper plate 4B Plate side through hole 5 Fixed side type plate 5B Type plate side through hole 6 Locating ring 7 Sprue bush 8 Sprue bush guide 9 Runner 10 Insertion piece 11 Cavity Member 14 Gate 16 Stopper Member (Opening Enlargement Means) 16A Shaft (Opening Enlargement Means) 16B Plate Receiving Part (Opening Enlargement Means) 45 Counterbore (Opening Enlargement Means) 51 Link (Opening Enlargement) Means) 52 link (opening expansion means) 53A pin 53B pin 54 pin 200 Molded product C Runner / gate removal range M Link mechanism

Claims (4)

[Claims] 1. A mold comprising a fixed mold portion and a movable mold portion, wherein the fixed mold portion is formed with a fixed side mounting plate, a runner stripper plate for peeling runners, and a cavity together with the fixed mold portion. A fixed piece that forms a part of the cavity on the parting line of the mold is attached to the fixed side mounting plate, and a fixed strip is formed between the runner stripper plate and the fixed side template. Place the runner in the
At the time of opening the mold after the product is formed, the mold metal is set so as to open a space between the runner stripper plate and the fixed side mold plate and set a runner / gate take-out range for taking out the runner or the like by a take-out machine. A mold structure, wherein, when the mold is opened, a large amount of opening between the fixed-side mounting plate and the runner stripper plate is taken, so that the degree of opening that positions the insertion piece outside the runner / gate removal range is increased. A mold structure having means. 2. A stopper member having a plate receiving portion is attached to the fixed side mounting plate, and the runner stripper plate is received by the stopper member when the mold is opened. The mold die structure according to claim 1, wherein the insert piece is received outside the runner / gate taking-out area. 3. The stopper member is provided with the plate receiving portion provided at a tip end side of a shaft portion, and a plate-side through-hole portion that allows only the shaft portion of the stopper member to pass through the runner stripper plate. A counterbore portion into which the plate receiving portion is inserted is provided, the stopper member is penetrated through the plate-side through-hole portion, and the shaft portion of the stopper member is attached to the fixed-side mounting plate, and a mold opening is performed. At that time,
3. The mold structure according to claim 2, wherein said plate receiving portion is inserted into said counterbore portion to receive said runner stripper plate. 4. The opening expansion means is connected to the fixed side mounting plate and the runner stripper plate by a link mechanism, and when the mold is opened, the link mechanism is opened to suspend the runner stripper plate. 2. The method according to claim 1, wherein the insertion piece is positioned outside the runner / gate removal area.
4. The mold structure of 1.