JPH091601A - Mold for resin molding - Google Patents

Abstract

PURPOSE: To replace a mold easily by installing a pair of mold plates in a mold main body detachably with a slide mold plate on which a mold carving part constituting a cavity is formed guided slidably. CONSTITUTION: A fixed side mold plate 20 is composed of a mold plate main body 24 which is fixed to a fixed side mounting plate 19 and a slide mold plate 25 which is placed opposite to a movable side mold plate 23, and the slide mold plate 25 is guided slidably in the perpendicular direction to the mold tightening direction and can be attached/detached to/from the mold plate main body 24. The movable side mold plate 23 is composed of a mold plate main body 29 which is fixed to a spacer block 22 and a slide mold plate 30 opposing the fixed side slide mold plate 25, and the slide mold plate 30 is guided slidably in the perpendicular direction to the mold tightening direction and can be attached/detached to/from the mold plate main body 20. Mold carving parts 34, 35 are formed at opposite positions in the fixed side and the movable side slide mold plates 25, 30 respectively, and a cavity, a runner, and a gate for filling mold carving parts 34, 35 with molten resin by mold tightening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding die used for injection molding.

[0002]

2. Description of the Related Art A conventional general resin molding die used for injection molding will be described with reference to FIG. As shown in FIG. 16, in the conventional resin molding die 1, the fixed-side mold plate 3 is attached to the fixed-side mount plate 2, and the movable-side mount plate 4 via the spacer block 5 and the receiving plate 6. A movable side mold plate 7 is attached. Fixed side mounting plate 2 and movable side mounting plate 4
Is connected to a fixed platen and a movable platen of a mold clamping device (not shown), and the mold is clamped to form a cavity C by the fixed-side mold plate 3 and the core 8 of the movable-side mold plate 7.

Then, the molten resin injected from an injection device (not shown) is filled in the cavity C through the sprue 9, the runner 10 and the gate 11 provided on the stationary mold plate 4. After the molten resin in the cavity C is cooled and solidified, the mold is opened, the ejector plates 12 and 13 are moved, and the ejector pins 14 are projected to release the molded product. In addition, in FIG.
Reference numeral 15 is a guide pin, 16 is a return pin, and 17 is a sprue lock pin.

Further, the above resin molding die is
There is a method in which a part of the mold in the cavity is replaced as a nest so that a different manufacturing number, manufacturing date, etc. can be marked for each manufacturing lot.

[0005]

However, in the conventional resin molding die 1 described above, when molding different products, it is common to replace the entire die, and the work is heavy. Since the resin molding die 1 is attached to and detached from the mold clamping device and is moved, it is very time-consuming and has been a factor of reducing the productivity of the molded product. Since it is necessary to prepare different molds for each product, the mold cost is increased and the space efficiency of the mold storage space is deteriorated. Even when the fixed mold plate 3, the movable mold plate 7, the ejector pin 14 and the like are replaced, or even when only the core 8 of the movable mold plate 7 is replaced, the resin molding mold 1 is removed from the mold clamping device, Since it is necessary to disassemble the whole, like the above,
There is a problem that it takes a lot of time to replace the mold. In addition, the disassembly and reassembly easily lowers the accuracy of the mold.

Therefore, conventionally, a fixed mold plate, a movable mold plate, a core, an ejector pin, an ejector plate, and the like are integrated and exchanged, so that different products can be molded without disassembling the entire mold. A resin molding die has been proposed. However, in such a resin molding die, since it is necessary to prepare an assembly in which a mold plate or the like is integrated for each product, manufacturing cost increases,
Since the weight of the assembly increases due to the integration, the workability of replacement is poor, and the assembly attachment / detachment mechanism is required, which causes a problem that the size of the mold is increased relative to the product size.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a resin molding die which allows easy die replacement.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a resin-molding mold, wherein a pair of mold plates are clamped to form a cavity. The mold plate is characterized in that a slide mold plate, in which a mold engraved portion forming the cavity is formed, is slidably guided and detachably provided in the mold plate body.

According to a second aspect of the present invention, in addition to the structure of the first aspect, the tip of the ejector pin that can project into the die engraved portion is inserted into the slide template, and the tip of the ejector pin is inserted. The part is removable.

Further, in the invention according to claim 3, in addition to the structure of claim 1 or 2, the tip of the sprue bush which is communicated with the mold engraved portion is inserted into the slide template.
It is characterized in that the tip of the sprue bush is removable.

[0011]

With this structure, according to the first aspect of the invention, the slide template can be slid to be attached to and detached from the template body.

According to the second aspect of the present invention, the slide template can be slid by removing the tip of the ejector pin, and the slide template can be attached to and detached from the template body.

According to the third aspect of the invention, the slide template can be slid by removing the tip of the sprue bush, and the slide template can be attached to and detached from the template body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2, in a resin molding die 18, a fixed side mold plate 20 is attached to a fixed side mount plate 19, and a movable side mount plate 21 is provided with a spacer block 22 interposed therebetween. A movable side template 23 is attached.

The fixed-side mold plate 20 is roughly composed of a mold plate body 24 fixed to the fixed-side mounting plate 19 and a slide mold plate 25 provided so as to face the movable-side mold plate 23. The slide mold plate 25 is fitted in the concave portion 26 of the mold plate body 24, and the guide flanges 27 formed on both sides are fitted in the groove parts 28 on the mold plate body 24 side, so that the slide mold plate 25 is orthogonal to the mold clamping direction. It is slidably guided to the template main body 24 by sliding.

The movable side mold plate 23 is roughly composed of a mold plate body 29 fixed to the spacer block 22 and a slide mold plate 30 provided so as to face the fixed slide mold plate 25. The slide mold plate 30 is fitted in the recess 31 of the mold plate body 29, and the guide flanges 32 formed on both sides are fitted in the groove parts 33 on the mold plate body 29 side. It is slidably guided to the template main body 29 by sliding.

Fixed and movable slide plates 25, 30
Have mold engraved portions 34, 35 (see FIG. 2) formed on the respective portions facing each other, and the mold engraved portions 34, 35 form cavities, runners and gates filled with molten resin by mold clamping. It is supposed to do.

A sprue bush 36, which communicates with the runner formed by the mold engraved portions 34 and 35, is attached to the stationary mold plate 20. The sprue bush 36, as shown in FIG.
The mold plate body 24 and the slide mold plate 25 are fixed to the fixed mold plate 20 by being inserted and fitted into the mounting holes 37 and 38 provided in the mold plate body 24 and the slide mold plate 25, respectively. In the figure, 39 is a positioning ring. The sprue bush 36 has a divided structure in which the base end portion 36a and the tip end portion 36b are screwed to each other, and is slidable from the base end portion 36a attached to the attachment hole 37 on the template body 24 side. By removing the tip end portion 36b inserted into the mounting hole 38 on the plate 25 side, the slide mold plate 25 can be slid to be attached to and detached from the mold plate body 24 (see FIG. 3). In addition, a hexagonal engagement portion 40 is formed on the inner surface of the tip opening portion at the tip end portion 36b of the sprue bush 36, and the tool 41 is attached to the engagement portion 40.
It can be attached to and detached from the base end portion 36a by engaging (hexagonal wrench or the like) (see FIG. 4). The base end portion 36a and the tip end portion 36b may be joined by other known joining means.

As shown in FIG. 2, the movable mold plate 23 is provided with ejector pins 42. Ejector pin 42
Is slidably inserted into pin holes 43 and 44 respectively provided in the template main body 29 and the slide template 30, one end of which is opposed to the inside of the mold engraving 35 and the other end is a movable side mounting plate. It is extended to the vicinity of 21 and is connected to the ejector plate 45. The ejector plate 45 is guided by a guide pin 46 (see FIG. 1) so as to be movable between the movable side mounting plate 21 and the template main body 29. And the ejector plate 45
Is driven by a driving means (not shown) such as a hydraulic cylinder, and when it is in the retracted position on the movable side mounting plate 21 side, the tip of the ejector pin 42 is flush with the mold engraving portion 35, and the mold plate main body 29
Side ejector pin 42
Is designed to project.

The ejector pin 42 includes a base end portion 42a and a tip end portion.
It has a divided structure that is configured by screwing 42b and
By removing the tip end part 42b inserted into the pin holes 43 and 44 of the fixed mold plate 23 from the base end part 42 connected to the ejector plate 45, the slide mold plate 30 can be slid and attached to the mold plate body 29. (See FIG. 3). Further, as shown in FIG. 5, the tip portion 42b of the ejector pin 42 is
6 is formed with an engagement portion 47 by chamfering a side surface portion from the tip end thereof. As shown in FIG. 6, the engagement portion 47 is formed by advancing the ejector plate 45 to project the ejector pin 42. A tool 48 is engaged with the portion 47 so that it can be attached to and detached from the base end portion 36a. The base end 42a and the tip end 42a
You may make it couple | bond with b with other well-known coupling | bonding means.

The length of the ejector pin 42 can be determined by changing the tip end 42b so that the shape of the molded product, that is, the slide template.
It can be adjusted according to the shape of the engraved portion 35 of 30. Further, as shown in FIG. 7, a cylindrical spacer 49 may be interposed between the base end portion 42a and the tip end portion 42b, and the spacer 49 may be exchanged for adjustment. Alternatively, as shown in FIG. 8, a lock nut 50 may be screwed onto the tip end portion 42b, and the position may be adjusted. In this case, as shown in FIG.
By screwing the two lock nuts 50, the tip 42b
The position of the lock nut 50 can be fixed in advance before attaching to the base end portion 42a, and the length of the ejector pin 42 can be set to a desired length.

Next, the positioning means for the slide mold plates 25 and 30 will be described. Since the fixed-side and movable-side slide mold plates 25 and 30 are positioned by the same positioning means, only the slide mold plate 30 on the movable-side mold plate 23 side will be described below.

As shown in FIG. 10 and FIG. 11, wedge-shaped concave portions 51 are formed on both side surfaces of the slide template 30, and the template main body is formed.
A wedge-shaped opening 52 is formed on both side surfaces of 29, and when the slide template 30 is at a predetermined position in the sliding direction, the concave portion 51 and the opening 52 are aligned so that both inclined surfaces of each other are aligned. It is designed to be flush. Then, a wedge-shaped holding member 53 (see FIG. 12) is fitted into the aligned recess 51 and opening 52,
A bolt 55 is inserted into the elongated hole 54 of the holding member 53 and screwed into a screw hole 56 formed at the bottom of the recess 51, so that the holding member 53 is recessed.
By pressing both inclined surfaces of the opening 52, the template main body 29 and the slide template 30 are positioned in the sliding direction and in the lateral direction thereof. here,
Between the bottom of the recess 51 and the tip of the holding member 51, 0.5 mm
A gap C _{1 of} about 1.0 mm is provided, and the holding member 53 can reliably press both the inclined surfaces of the recess 51 and the opening 52.

Further, as shown in FIG. 13, the slide template 30 has bolts 57 inserted in a direction orthogonal to the sliding direction, that is, in the mold clamping direction.
It is positioned by being pressed into the bottom of the recess 31 of the template body 29 by being screwed into. Where the figure
As shown in FIG. 11, the recess 51 of the slide mold plate 30, the opening 52 of the mold plate body 29, and the holding member 53 are provided with a clearance C _{2 of} about 0.5 mm to 1.0 mm in the tightening direction of the bolt 57. In addition, the long hole 54 of the holding member 53 is extended in the tightening direction of the bolt 57 so that a clearance C _{3 of} about 0.8 mm to 1.2 mm is provided between the long hole 54 and the bolt 55. The slide template 30 is smoothly positioned by the bolts 57.

The operation of the present embodiment configured as described above will be described below.

The fixed side mounting plate 19 and the movable side mounting plate 21 are respectively connected to a fixed platen and a movable platen of a mold clamping device (not shown), and the sprue bush 36 is used as an injection nozzle of an injection device (not shown). Connecting. The mold clamping device is operated to clamp the fixed-side mold plate 20 and the movable-side mold plate 23, and the mold engraved portions 34 and 35 of the fixed-side and movable-side slide mold plates 25 and 32 are combined to form a cavity and a gate. And forming a runner. Molten resin is injected from an injection device and filled in the cavity through the sprue bush 36, the runner, and the gate. After the molten resin in the cavity is cooled and solidified, the mold is opened, the ejector plate 45 is moved, and the ejector pin 42 is projected to release the molded product.

Next, the case of exchanging the slide mold plates 25 and 30 will be described. The mold is opened, and the tip end 36b of the sprue bush 36 is removed using a tool 41. The ejector pin 42 is projected, and the tip 42b is removed using the tool 48. The bolt 55 and the holding member 53 are removed, and the bolt 57 is removed. By removing the tip 36b of the sprue bush 36 and the tip 42b of the ejector pin 42, the slide mold plates 25 and 30 can be slid as shown in FIG.
It can be removed from 24 and 29. Further, the slide templates 25 and 30 can be attached to the template main bodies 24 and 29 in the reverse order of the above, and the slide templates 25 and 30 can be moved to the predetermined positions by tightening the bolts 55 and 57 with a specified torque. It can be positioned and fixed.

When the slide template 30 is replaced, the tip portion 42a of the ejector pin 42 is replaced so that the length of the ejector pin 42 can be adjusted according to the shape of the molded product, that is, the shape of the mold engraved portion 35. . The length of the ejector pin 42 can be adjusted by replacing the spacer 49 interposed between the base end portion 42a and the tip end portion 42b as shown in FIG. In this case, the cost of die replacement can be reduced by using the spacer 49 which is cheaper than the case of exchanging the tip portion 42b. Further, as shown in FIG. 8, the length of the ejector pin 42 can be adjusted by adjusting the screwing depth of the tip portion 42b using the lock nut 50. In this case, in addition to cost reduction, the length of the ejector pin 42 can be freely adjusted. Further, as shown in FIG. 9, since the lock nut 50 can be fixed in the mounting position by using the two lock nuts 50, the length of the ejector pin 42 can be preset and the adjustment work is facilitated. Can be

As mentioned above, if desired, a slide template
By exchanging only the tip parts 42b of the ejector pins 42 and 25, 30, different molded products can be molded,
No need to disassemble the entire mold, and slide template 2
Since 5 and 30 are smaller and lighter than the conventional one-piece mold plate, it is possible to prevent the accuracy of the mold from being deteriorated due to disassembly and to greatly improve the workability of mold replacement. Furthermore, since the slide template is small and lightweight, it is possible to reduce the manufacturing cost and save space.

In the above embodiment, the case where the slide mold plates 25 and 30 are provided on both the fixed-side mold plate 20 and the movable-side mold plate 23 has been described. The slide template may be provided on only one template.

Next, a modification of the above embodiment will be described with reference to FIGS. 14 and 15. The same parts as those in the above embodiment are designated by the same reference numerals and only different parts will be described.

For example, in the case where the mold is clamped in the vertical direction, such as a resin molding die used in a vertical injection molding machine,
As shown in FIG. 14, the guide flange 33 provided on the slide template 30 of the template (the movable template 23 in the figure) arranged on the lower side and the groove 33 of the template body 22 for guiding the guide flange 33 are provided. It can be omitted.

Further, in a case where the mold is clamped in the horizontal direction, such as a resin molding die used in a horizontal injection molding machine, as shown in FIG. 15, only the mold plate (only the movable side mold plate 23 is shown). With the structure in which the lower end 31a of the groove 31 of the template body 22 in (1) is closed, it is possible to prevent the slide template 30 from dropping when attaching or detaching.

[0035]

As described above in detail, according to the first aspect of the invention, since the slide template is slidably guided and detachably provided in the template body, the slide template is provided. Can be slid on and removed from the template body. As a result, by exchanging the slide template, different molded products can be molded, there is no need to disassemble the entire mold, and the slide template is smaller than the conventional integrated template. Since it is lightweight, it is possible to prevent deterioration of the accuracy of the mold due to disassembly and to greatly improve the workability of mold replacement. Further, since the slide template is small and lightweight, it is possible to reduce the manufacturing cost of the mold and to save space, which is an excellent effect.

According to the second aspect of the present invention, the tip of the ejector pin that is inserted into the slide template is detachable. Therefore, by removing the tip of the ejector pin, the slide template slides. It becomes possible and the slide template can be attached to and detached from the template body.

Further, according to the invention of claim 3, since the tip of the sprue bush communicating with the die-cut portion of the slide template can be attached and detached, the slide can be removed by removing the tip of the sprue bush. The template becomes slidable, and the slide template can be attached to and detached from the template body.

[Brief description of the drawings]

FIG. 1 shows a resin molding die according to an embodiment of the present invention.
It is a perspective view showing the state where the slide type board was made to slide.

FIG. 2 is a vertical cross-sectional view of a main part of the apparatus of FIG. 1, showing a mold-opened state.

FIG. 3 is a longitudinal cross-sectional view of essential parts showing a state where the tip end portions of the sprue bush and the ejector pin are removed and the slide template is slid in the device of FIG.

4 is an exploded perspective view of the sprue bush and tool of the apparatus of FIG.

5 is an exploded perspective view of the ejector pin of the apparatus of FIG. 1. FIG.

6 is a view showing a cross section and a tool of an engaging portion of the ejector pin of FIG.

7 is an exploded perspective view showing a modified example of the ejector pin of the apparatus of FIG.

FIG. 8 is an exploded perspective view showing another modified example of the ejector pin of the apparatus of FIG.

9 is an exploded perspective view showing still another modified example of the ejector pin of the apparatus of FIG. 1. FIG.

10 is a cross-sectional view of the slide template positioning mechanism of the apparatus of FIG.

11 is an exploded vertical sectional view of a positioning mechanism for a slide template of the apparatus shown in FIG.

12 is a perspective view of a holding member of the positioning mechanism shown in FIGS. 10 and 11. FIG.

13 is a perspective view showing a fixing structure of a slide template of the apparatus shown in FIG.

FIG. 14 is a perspective view showing a modified example of the movable mold of the apparatus of FIG.

15 is a perspective view showing another modified example of the movable mold of the apparatus of FIG. 1. FIG.

FIG. 16 is a vertical cross-sectional view of a conventional resin molding die.

[Explanation of symbols]

 18 Mold for resin molding 20 Fixed-side mold plate 23 Movable-side mold plate 24 Mold plate body 25 Sliding mold plate 29 Mold plate body 30 Sliding mold plate 34,35 Mold engraving part 36 Sprue bush 36b Tip part 42 Ejector pin 42b Tip part

Claims (3)

[Claims] 1. A resin-molding mold in which a pair of mold plates are clamped to form a cavity, wherein the mold plates are
A mold for resin molding, characterized in that a slide mold plate on which a mold engraving portion forming the cavity is formed is slidably guided and detachably provided on a mold plate body. 2. The slide template has a tip of an ejector pin projecting into the die engraved portion, and the tip of the ejector pin is removable. The resin molding die according to. 3. The slide template has a tip portion of a sprue bush that communicates with the die engraving portion inserted therein, and the tip portion of the sprue bush is removable. The mold for resin molding according to 2.