JPH0584751A - Method for producing mold having protruding part - Google Patents

Abstract

PURPOSE:To shorten a processing time and a programming time by forming a protruding part by pushing up a protruding part core to the upper part of a fixing plate and subsequently removing the hole of an approach point and the part of the groove continued from said hole by wire electric discharge machining to insert a hole filling-up core in the removed part. CONSTITUTION:When a split core mold having a protruding part is produced, at first, a material 11 to be processed having the hole 11a of an approach point for performing wire electric discharge machining is divided into a protruding part core 13 and a core fixing plate 14 by processing the shape of a core in a first draft angle by wire electric discharge machining. Next, the protruding part core is subjected to tapering in a second draft angle by wire electric discharge machining so that the protruding part core protrudes to the upper part of the fixing plate in a scheduled value and a protruding part is formed by the insertion of a spacer 15. Thereafter, the hole of the approach point and the part 16 of the groove continued from the hole 11a are removed by wire electric discharge machining and a hole filling-up core 17 is inserted in the removed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a split insert mold having a projection, which is used for molding a molded product having a recess, and particularly, shortens the processing time and the setup time, and The present invention relates to a method for manufacturing a die having a protrusion capable of reducing the material cost.

[0002]

2. Description of the Related Art Generally, a plastic molding die having a protrusion is often used for molding a molded article having a recess. FIG. 7 is a perspective view showing an example of the relationship between a molded product 1 having a recess and a plastic molding die 2 having a protrusion.

The following two methods have heretofore been adopted as methods for producing a plastic molding die having such protrusions.

(A) As shown in a partial end view in FIG. 8, an unnecessary portion 3 is machined out from a work material having a size larger than at least (plate thickness + protrusion thickness) to form an integrated metal. How to make mold 4.

(B) As shown in the partial cross-sectional view of FIG. 9, the projection insert 5 and the fixing plate 6 for fixing the insert are machined by cutting out from separate work pieces to form a split insert mold. How to make.

However, in such a manufacturing method,
There are the following problems.

First, in the method of manufacturing an integrated die, (a) the machining time is long because the material is machined from a large-sized material to be machined. (B) Since the material is machined from a large size to be machined, the ratio of shavings in the material is high, the material is wasted, and the material cost is high.

Further, in the method of manufacturing the split nesting die, (a) the fixing plate 6 and the protruding portion nesting 5 are cut out from different materials to be machined, so that it is necessary to make holes for holding the nesting. The ratio of waste is high, the material is wasted, and the material cost is high. (B) Since it is necessary to prepare different materials to be processed and highly accurate processing is required, it takes time to set up.

[0009]

As described above, in the conventional method of manufacturing a mold having a protrusion, not only the processing time and the setup time are long, but also the material cost is high. ..

The present invention has been made in order to solve the above-mentioned problems, and is extremely highly reliable in that it can shorten the processing time and the setup time as well as the material cost. An object of the present invention is to provide a method of manufacturing a mold having a protrusion.

[0011]

In order to achieve the above-mentioned object, in the present invention, in a method for producing a split nesting die having a protrusion, which is used for molding a molded article having a recess, first, wire discharge The material to be machined, which has holes for approach points for machining, is processed into the insert shape by the first draft by wire electric discharge machining, and is divided into the protrusion insert and the fixing plate for fixing the insert. Then, the protrusion insert is tapered by a second draft by wire electric discharge machining so that the protrusion insert protrudes above the fixed plate at a preset value, and then the protrusion amount of the protrusion insert. By inserting a spacer having a thickness approximately equal to that from the side opposite to the protruding part of the protruding part nest, the protruding part nest is pushed up to the upper part of the fixing plate to form the protruding part. Into the holes, and the portion of the groove continuing from the holes was removed by wire electric discharge machining, so that to insert the nesting for filling in the removed portion.

[0012]

Therefore, in the method of manufacturing a die having a projection according to the present invention, the processing time and the setup time are shortened by simultaneously processing the projection insert and the fixing plate for fixing the insert. be able to.

Further, since the material to be processed having a size larger than (plate thickness + thickness of the protrusion) is not required, the ratio of shavings is reduced, and the material is effectively used to reduce the material cost. be able to.

[0014]

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

The mold having the protrusion according to this embodiment is manufactured by the following method.

That is, first, as shown in a partial cross-sectional view in FIG. 1, a square columnar workpiece 1 provided with a hole 11a as an approach point for performing wire electric discharge machining.
1 is wire electrical discharge machining (12 is electrical discharge machining wire)
Process the shape of the nest with the first draft θ1
It is divided into a protrusion insert 13 and a fixing plate 14 for fixing the insert.

Here, as the material of the material 11 to be processed,
For example, HPM-1, HPM-31, HPM-38, N
AK-55, NAK-80, etc. (both are trade names) can be used. Wire electrical discharge machining is a process for machining a workpiece by repeatedly performing transient arc discharge for an extremely short time in a minute gap between the workpiece in an insulating liquid and the wire that is the machining electrode. Is the law.

Next, as shown in the partial sectional view of FIG. 2, the protrusion insert 13 is wire-discharge machined to a second position so that the protrusion insert 13 protrudes above the fixing plate 14 at a preset value. Tapering is performed with a draft of θ2 (θ2> θ1).

Next, as shown in the partial cross-sectional view of FIG. 3, a spacer 15 having a thickness substantially equal to the protruding amount of the protrusion insert 13 is inserted from the side opposite to the protrusion of the protrusion insert 13 as shown. By doing so, the protrusion insert 13 is pushed up to the upper part of the fixing plate 14 to form a protrusion.

Here, as the material of the spacer 15, for example, rolled steel for general structure (SS41) or carbon steel for mechanical structure (S45C) can be used.

However, in this state, the groove portion 16 continuing from the hole 11a at the approach point initially provided for performing the wire electric discharge machining causes the remaining material leakage as shown in the figure, which is appropriate. Later in Figure 4
And as shown in the perspective view in FIG. 5, the approach point hole 11a and the groove portion 16 leading from this hole 11a.
Is removed by wire electric discharge machining, and a nest 17 for filling holes is inserted into the removed portion as shown in the figure.

As described above, a mold having a protrusion as shown in the partial sectional view of FIG. 6 can be manufactured.

In this case, when manufacturing a die having such protrusions, the protrusion insert 13 and the fixing plate 14 for fixing the insert are simultaneously processed to shorten the processing time and the setup time. be able to.

Further, unlike the conventional case, since a work material having a size larger than (plate thickness + protrusion thickness) is not required, the ratio of shavings is reduced, and the material is effectively used. Material costs can be reduced.

As described above, in the present embodiment, when manufacturing the split insert mold having the protrusions, which is used for molding the molded product having the recesses, first, the hole of the approach point for performing the wire electric discharge machining is formed. The material 11 to be processed provided with 11a is processed into a nest shape with a first draft angle θ1 by wire electric discharge machining, and the projection nest 1
3 and the fixing plate 14 for fixing the nest, and then,
The protrusion insert 13 is tapered by a second draft θ2 (θ2> θ1) by wire electric discharge machining so that the protrusion insert 13 protrudes above the fixed plate 14 at a preset value, and then the protrusion insert By inserting a spacer 15 having a thickness substantially equal to the protrusion amount of the insert 13 from the side opposite to the protrusion of the protrusion insert 13, the protrusion insert 13 is pushed up to the upper part of the fixing plate 14 to form a protrusion. Later, the approach point hole 11a and this hole 11a
The groove portion 16 continuing from a is removed by wire electric discharge machining, and the insert 17 for filling the hole is inserted into this removed portion.

Therefore, since the projection insert 13 and the fixing plate 14 for fixing the insert are simultaneously processed, the processing time and the setup time can be remarkably shortened.

Further, since a work material having a size larger than (plate thickness + thickness of protrusion) is not required as in the prior art, the ratio of shavings is reduced, and the material is used very effectively. Material costs can be significantly reduced.

[0028]

As described above, according to the present invention, when manufacturing a split insert mold having a protrusion, which is used for molding a molded product having a recess, first, an approach for performing wire electric discharge machining is used. The material to be processed provided with the hole of the point is processed into the shape of the nest with the first draft by the wire electric discharge machining, and is divided into the projection nest and the fixing plate for fixing the nest, and then fixed. The protrusion insert is taper-processed by the second draft by wire electrical discharge machining so that the protrusion insert protrudes at the preset value on the upper part of the plate, and then the protrusion insert has a thickness approximately equal to the protrusion amount. By inserting the spacers that are provided from the side opposite to the projecting part of the projecting part nest, the projecting part nest is pushed up to the upper part of the fixing plate to form the projecting part. Since the groove portion continuing from the hole is removed by wire electric discharge machining and the nest for filling the hole is inserted into the removed portion, the processing time and the setup time are shortened, and the material cost is also reduced. It is possible to provide a method of manufacturing a mold having a protrusion with extremely high reliability.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a method of manufacturing a mold having a protrusion according to the present invention.

FIG. 2 is a partial cross-sectional view showing an embodiment of a method of manufacturing a mold having a protrusion according to the present invention.

FIG. 3 is a partial cross-sectional view showing an embodiment of a method of manufacturing a mold having a protrusion according to the present invention.

FIG. 4 is a perspective view showing an embodiment of a method of manufacturing a mold having a protrusion according to the present invention.

FIG. 5 is a perspective view showing an embodiment of a method of manufacturing a mold having a protrusion according to the present invention.

FIG. 6 is a partial cross-sectional view showing a structural example of a mold having a protrusion manufactured by the manufacturing method of the embodiment.

FIG. 7 is a perspective view showing an example of the relationship between a molded product having a recess and a plastic molding die having a protrusion.

FIG. 8 is an end view showing a method for manufacturing a conventional integrated die.

FIG. 9 is a partial cross-sectional view showing a method for manufacturing a conventional split insert mold.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Molded article, 2 ... Plastic molding die, 3 ... Unnecessary part, 4 ... Integral die, 5 ... Projection part nesting, 6 ... Fixing plate, 1
1 ... Workpiece material, 11a ... Hole at approach point, 1
2 ... Wire for electric discharge machining, 13 ... Nesting for protrusion, 14 ...
Fixing plate, 15 ... Spacer, 16 ... Groove portion, 17 ... Nest for filling holes, θ1 ... First draft, θ2 ... Second draft.

Claims (1)

[Claims] 1. A method for manufacturing a split nesting die having a protrusion, which is used for forming a molded article having a recess, in which a work material having a hole as an approach point for performing wire electric discharge machining is provided. By machining the shape of the nest with the first draft by wire electric discharge machining to divide the nest into the protrusion nest and the fixing plate for fixing the nest, and then projecting the protrusion with the preset value on the upper part of the fixing plate. The protrusion insert is tapered by a second draft by wire electric discharge machining so that the protrusion inserts, and a spacer having a thickness substantially equal to the protrusion amount of the protrusion insert is attached to the protrusion. By inserting from the anti-projection side of the insert, the protrusion insert is pushed up to the upper part of the fixing plate to form a protrusion, and then the hole at the approach point and the contact The portion of the groove continuing from the holes was removed by wire electrical discharge machining,
A method of manufacturing a mold having a protrusion, wherein a nest for filling holes is inserted into the removed portion.