JPH0486230A - Gate-cutting method for injection-molding - Google Patents

Abstract

PURPOSE:To enable a gate to be cut surely without marring a product by a method in which a protrusion is preliminarily formed on an injection-molding and is inserted into the hole of a gate-cutting device, and then a runner is separated from the injection-molding. CONSTITUTION:A mold is designed so that a protrusion 25 is molded near the gate 24 of a runner 23 when first injection molding is carried out. In the molding 26 injection-molded by the mold, the protrusion 25 is molded near the gate 24 the runner 23. Next, the molding 26 taken out from the mold is placed on a gate-cutting device 27. In the gate-cutting device 27, the hole 28 into which the protrusion 25 is inserted and fixed at the position corresponding to the protrusion 25 having been molded in the runner 23 of the molding 26, is formed. When the molding 26 is placed, the protrusion 25 is inserted into the hole 28 and is fixed there. By this process, the positioning of the molding 26 for the gate-cutting device 27 is completed. After the finish of said positioning, a cutter 29 is operated, and the gate 24 is cut, whereby a product 30 is separated from the runner 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for separating, using a cutter, a runner connected to an injection molded product taken out from a mold.

(Prior art) As shown in FIGS. 5 to 7, a molded product taken out from a mold is placed on a gate I cut device 2, a gate 4 is cut with a cutter 3, and a product 5 is cut. A method for separating the runner 6 and the runner 6 is known.

In addition, as shown in FIG. 7, the sprue 1 of the molded product 11
There is also known an apparatus in which the product 15 and the runner 16 are separated by gripping the product 15 with a gripping means 12 and cutting the gate 14 with a cutter 13.

(Problems to be Solved by the Invention) In the second prior art, as shown in FIG. 7, the runner 6 is bent before the gate 4 is cut, and the gate 1
Not only is it not possible to cut the product 4 accurately, but the product 5 is tilted.
There is a problem in that the cutter 3 comes into contact with the tilted product 5 and damages the product 5.

In addition, in the latter case, a considerable amount of force is generated because the cutter core 3 comes into contact with the gate 14 for cutting, and the moment increases due to the distance between the sprue 11a and the gate 14, which makes it difficult for the gripping means 1.2 to grip it. There have been problems in that the molded product 1 rotates without being rotated, and the product 5 comes into contact with the cutter 13 due to the rotation, resulting in damage to the product 15.

(Means for Solving the Problems) The present invention aims to solve the second problem, by forming protrusions on an injection molded product in advance, taking out the injection molded product from the mold, and cutting the protrusions with a keto cutter. The runner is fitted and placed in the recess of the injection molded product, and the runner is separated from the injection molded product using a cutter.

(Example) Next, a detailed explanation will be given based on the example shown in FIGS. 1 to 4.

When injection molding is performed for the first time, the mold is designed so that the protrusion 25 is formed in the vicinity of the groove 1 of the runner 23 and the groove 24. A molded product 26 injection-molded by the mold has a protrusion 25 formed in the vicinity of the gage 1 of the runner 23 .

Next, the molded product 26 taken out from the mold is placed on the gate cup 1 to device 27. The cut device 27 for the game 1 has a protrusion 25 formed on the runner 23 of the molded product 26.
A hole 28 into which the protrusion 25 is inserted and fixed is formed at a position corresponding to the hole 28 .

When placing the molded product 26, the protrusion 25 is inserted into the hole 28 and fixed (see FIG. 2). This completes the positioning of the molded product 26 to the gate cutting device 27.

After the positioning is completed, the cutter 29 is operated to cut the gate 24 and separate the product 30 and the runner 23.

(Effects) According to the present invention, protrusions are formed on a caulked injection molded product, the injection molded product is taken out from the mold, the protrusions are fitted and placed in the recesses of a gate cutter device, and the injection molded product is cut with a cutter. Since the runners are more separated, gate cutting can be performed reliably without damaging the product.

Note that holes may be formed in the runner and convex portions may be formed in the gate cutter device.

[Brief explanation of drawings]

Figure 1 is a partial plan view of a molded product injection molded by the method of the present invention, Figure 2 is a front view of the molded product, and Figure 3 is a
A front sectional view, and FIG. 4 is a partial plan view of a molded product in which the gate cut by the method of the present invention was injection molded by the conventional method.
Figure 6 is a partial front view of the molded product shown in Figure 5 when the gate is cut;
Figure 7 is a partial front view of the molded product shown in Figure 6 when it is bent;
The figure is an overall plan view of the game I/C-1 according to the conventional method.

Claims (1)

[Claims] Injection molding in which projections are formed in advance on an injection molded product, the injection molded product is taken out from the mold, the projections are fitted and placed in the recesses of a gate cutter device, and the runner is separated from the injection molded product by a cutter. How to gate cut products.