JPH0743754U - Molding equipment - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The squeeze pin of the molding machine can be replaced from the mold dividing surface. [Structure] A case 8 of a coupling 7 for connecting a shaft part for driving a squeeze pin 11 forward and backward and a rear part of the squeeze pin.
The bush 4 has a polygonal outer surface and the outer peripheries of the flanges 9 and 10 inside the case are also polygonal, and at least two sides of both polygons are in close contact with the outer surface, and a cavity core 2 dividing surface has a hole through which a squeeze pin passes. Fit and fix.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a molding die, and more particularly to a squeeze pin mounting structure.

[0002]

[Prior art]

 Generally, in injection molding, a cavity composed of a concave convex portion is defined between two molds, and a molten material is press-solidified into the cavity. The squeeze pin is used to press the meat pressure part, which is the final solidification, just before the molten material solidifies, and to eliminate the voids that pose quality problems. Then, as shown in Fig. 1, the squeeze pin is inserted into the cavity core of the molding die from the back side of the molding die via a bush and is pushed from the back side when worn or damaged. It had been disassembled and replaced with the department.

[0003] Thus, when it becomes necessary to replace the squeeze pin during molding, the mold is attached to the molding machine. Therefore, the mold is removed from the molding machine each time, and a hydraulic cylinder that further generates pressing pressure is produced. After disassembling etc., the squeeze pin is replaced. This is inefficient in terms of time and labor because it obviously requires the work of removing and mounting the mold and disassembling the hydraulic cylinder and the like.

[0004]

[Problems to be solved by the device]

 Therefore, the problem to be solved by the present invention is to replace the squeeze pin by the dividing surface of the cavity core of the molding die.

[0005]

[Means for Solving the Problems]

 For that purpose, as described in claim 1, a rotation preventing member which is interposed between a shaft portion which is driven forward and backward from the back surface of the mold and a rear portion of a squeeze pin which presses the molten material in the cavity on the verge of solidification. At least one of which has a polygonal shape in the advancing / retracting direction, at least two sides of the polygon are formed in contact with the outside, respectively, and a bush through which the squeeze pin slides through is detachably fitted and fixed to the cavity core. To do.

[0006]

[Action]

 Then, when replacing the squeeze pin, you can first remove the bush with a tool from the dividing surface and then rotate the squeeze pin with the tool to loosen it and remove it, so there is no need to remove the mold from the molding machine. You can make a good squeeze pin exchange.

[0007]

【Example】

 First, embodiments will be described with reference to the drawings. FIG. 2 shows an example of the present invention, in which a bush 4 having a plurality of concave portions on the cavity surface is screwed into an opening hole 3 of a cavity core 2 of a molding die 1. Further, a holder 5 reinforces the cavity core 2 from the rear side by contacting it, and a rectangular hole 6 is formed in the holder 5, and an outer peripheral quadrangular coupling 7 is slidable in the pressing force direction in the hole 6. Further, the outer peripheral square flanges 9 and 10 are joined to the inside of the case 8 of the coupling 7 so that the accumulated portions are joined to each other. Then, the tip of a squeeze pin 11 penetrates the bush 4 and is accumulated on the flange 9, and a hexagonal collar 12 is defined on the squeeze pin 11 near the base. A shaft portion 14 of a hydraulic cylinder 13 is integrated with the flange 10. The hydraulic cylinder 13 is fixed to the holder 5. FIG. 3 is a sectional view taken along the line AA in FIG. 2 and shows that the outer circumferences of the coupling 7 and the flanges 9 and 10 are quadrangular. FIG. 4 shows another embodiment of the present invention, in which the rotation preventing member 15 joins the shaft portion 14 and the squeegee pin 11.

The operation will be described with reference to the drawings. When the squeeze pin 11 needs to be replaced while the molding die 1 is attached to a molding machine (not shown) and is being produced, first, in a state where the mold is opened, a plurality of recesses are formed on the cavity surface from the dividing surface side. The bush 4 is held by a special tool (not shown) that fits into the recess, and the accumulation is released. Then, next, since the outer case 8 of the coupling 7 and the inner flanges 9 and 10 are quadrangular peripherals, a tool having a hexagonal recess at the tip of the hexagonal flange 12 provided near the base of the squeeze pin 11. The cumulative diameter can be swung with (not shown), and the squeeze pin 11 is removed. Then, install the new squeeze pin in the reverse order of removing it as described above. It goes without saying that the members facing the above two tools (the flange 12 of the squeeze pin 11 and the shape of the cavity surface of the bush 4) are not limited to these and may have any turning function. Further, a rotation preventing member 15 as shown in FIG. 4 may be used.

[0009]

[Effect of device]

 As described above, the squeeze pin can be replaced from the dividing surface side without removing the mold from the molding machine, so that the work is efficient without requiring much labor and time. It is also effective not only for repair but also when changing the thickness of the squeeze pin.

[Brief description of drawings]

FIG. 1 is a diagram of a conventional squeeze pin mounting structure.

FIG. 2 is a diagram of an embodiment of the present invention.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a diagram of another embodiment of the present invention.

[Explanation of Codes] 1 Mold 2 Cavity Core 3 Opening Hole 4 Bushing 5 Holder 6 Hole 7 Coupling 8 Case 9 Flange 10 Flange 11 Squeeze Pin 12 Tsuba 13 Hydraulic Cylinder 14 Shaft 15 Rotation Preventing Member

Claims (1)

[Scope of utility model registration request] 1. A structure for mounting a squeeze pin of an injection molding die, in which a shaft portion driven forward and backward from the back surface of the die and a rear portion of a squeeze pin for pressing a molten material in a cavity on the verge of solidification are interposed and joined. At least one of the rotation prevention members
The above forms a polygon in the advancing / retreating direction, at least two sides of each polygon are formed in contact with the outside, and a bush through which the squeeze pin slides through is fitted and fixed to the cavity core. Characterizing molding equipment.