JPH01178343A - Manufacture of metallic mold - Google Patents

Abstract

PURPOSE:To effectively manufacture a metallic mold pattern by forming by NC-machining shaped part of the metallic mold pattern having curved surface corresponding to the mold surface in the metallic mold and forming a supporting part having no curved surface by piling up plural thin plate panels. CONSTITUTION:The shaped part 3 having the curved surface on the surface of the metallic mold pattern 6 is machined at good accuracy by shaping with NC machining. On the other hand, the supporting part 5 in the metallic mold 6 is formed by piling up plural thin plate panels 4, but as the curved surface in the shaped part 3 is not shaped over the whole, thickness of the thin plate panel 4 can be made to comparatively thick. Therefore, at the time of finding the outline data at each slice part by slicing the metallic mold to plural cross sectional parts with the pitch corresponding to the thickness of the thin plate panel 4 from three dimensional shaping data for the metallic mold in a computer, the calculation is made to comparatively easy. Further, the machining of the thin plate panel 4 based on this outline data can be executed for short time because of little number of the panels.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a mold for press working etc. by full mold casting, and in particular, a method for manufacturing a mold for press working etc. by full mold casting. It is related to the production of mold models.

(Prior art) Conventionally, as one of the manufacturing methods for manufacturing molds used for press working, casting work, etc., a model of the mold to be manufactured is formed from styrofoam material, etc., and the model is used during mold crushing. burying the mold in a mold and injecting molten metal into it, burning out the model buried in the mold crushing by the heat of the molten metal, and filling the cavity formed according to the external shape of the model during the mold crushing with the molten metal. A full mold casting method is known in which a metal mold is obtained using the following methods.

On the other hand, as a method for producing a mold model used in such full mold casting, recent attempts have been made to automate and improve accuracy through the introduction of computers and the like. One method is to create three-dimensional shape data of a mold using a computer, and then form a mold model using an NC processing machine based on the data.

In addition, as another method, for example, Japanese Patent Publication No. 61-47620
As disclosed in the above publication, the computer further slices the mold at equal pitches from the three-dimensional shape data of the mold to obtain contour data of each sliced portion, and based on this contour data, the pitch is determined based on the contour data. A plurality of thin plate-shaped panels having the same thickness as are each processed using a cutter or the like into a contour shape corresponding to each sliced portion, and the thin plate-shaped panels processed into the contoured shape of each sliced portion are overlapped and bonded to each other. By doing so, a mold model can be obtained.

(Problem to be Solved by the Invention) However, among the above mold model manufacturing methods, in the case of the former (that is, the method using NC machining), cutting is performed from a rectangular parallelepiped material larger than the mold model to be manufactured. Therefore, there is a problem that the amount of cutting is large and it takes a long time, which inevitably increases the cost.

On the other hand, the latter (i.e. the method of polymerizing laminated panels)
In this case, since the surface of the shape part of the mold model corresponding to the mold surface of the mold is a curved surface, the pitch in slicing the mold needs to be considerably small.

For this reason, a large-sized computer with a large computing capacity and storage capacity must be used, which increases the equipment cost. Another problem is that a large number of thin panels must be processed into contours corresponding to each sliced portion, and the processing takes a long time.

The present invention has been made in view of these points, and its purpose is to appropriately combine the above-mentioned NC processing method and the method using thin panel polymerization in accordance with the shape of the mold model. This makes it possible to efficiently create a mold model.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention provides a manufacturing method for manufacturing a mold by full mold casting using a mold model, in which the shape of the mold model is The part is NC71ff
The supporting part of the mold model is formed by overlapping a plurality of thin plate panels with each other.

(Function) According to the above configuration, in the present invention, the curved surface of the mold model is shaped by NC processing, so that the curved surface can be processed with high accuracy. It will be done. Moreover, the NC machining is limited to the shape of the mold model, and the processing material is a relatively small rectangular parallelepiped corresponding to the shape, so the amount of cutting is small and the machining time is Can be shortened.

On the other hand, the support part of a mold model is formed by overlapping multiple thin plate panels, but since this support part does not have a curved surface that covers the entire surface like the shaped part, the thickness of the thin plate panel can be relatively thick. For this reason, when a computer slices the mold into multiple cross-sectional parts at a pitch corresponding to the thickness of the thin panel from the three-dimensional shape data of the mold and calculates the contour data of each slice, it is relatively easy to calculate. This reduces the computational and storage capacity of the computer. Further, processing of thin plate-shaped panels based on this contour data can be performed in a short time because the number of panels is small.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the overall steps of a manufacturing method for manufacturing a mold by full mold casting using a mold model, according to an embodiment of the present invention. As shown in Fig. 1, when manufacturing a mold, first, two-dimensional graphic data representing multiple types of exploded planar images and external planar images of the mold to be manufactured are manually generated on a computer. ,
From the input data, three-dimensional shape data representing the overall image of the mold is created and stored (Sl).

Next, based on the data of the part of the mold surface of the mold among the three-dimensional shape data, the shape of the mold model corresponding to the part of the mold is shaped by the NC processing machine (S2
). As shown in FIG. 2, this shaping process involves moving the cutting rotary blade 2 of the NC processing machine in a zigzag pattern while vertically displacing the upper surface of the rectangular parallelepiped-shaped polystyrene foam cable material 1. carried out by

At this time, the rectangular parallelepiped material 1 needs only to have a size that corresponds to the shape part 3 of the mold model to be shaped, and the size is necessary when forming the entire mold model by NC processing. Since it is much smaller than the case of a rectangular parallelepiped material, the amount of cutting by the NC processing machine is relatively small. This reduction in the amount of cutting is not simply due to the shaping being limited to a portion of the mold model, but also because the shaping portion has a small volume ratio with respect to the supporting part 5 of the mold model (see Figure 2). There is an important point in specifying the shape portion 3. In other words, since the support part 5 is wider than the shape part 3 in plan, when shaping the entire mold model, a rectangular parallelepiped material that is spread out in a plane corresponding to this support part 5 will not be able to shape the shape. This is because the amount of cutting in section 3 becomes extremely large. Since the amount of cutting is reduced in this way, the machining time by NC machining can be shortened, and manufacturing costs can be reduced. Further, the curved surface of the shaped portion 3 can be processed with high accuracy by NC processing.

On the other hand, a supporting part of the mold model is formed in parallel with the shaping of the shaped part 3 of the mold model (S3.S4°85). In forming this support part, first, in a computer that stores the three-dimensional shape data of the mold, the lower part of the part of the three-dimensional shape data that has the mold surface of the mold (the mold model The lower part of the mold is sliced at a predetermined pitch in the longitudinal direction based on the data of the part corresponding to the support part of the mold, and contour data of each slice part is created (S
3). Next, a plurality of thin styrofoam panels 4 having a thickness equal to the pitch are formed based on the contour data.
,4. ... (see FIG. 3) are processed into contour shapes corresponding to each slice portion.

To process the outline of each thin panel 4, for example, the outline of each slice is drawn on a recording paper using a printer, which is an output unit of the computer, based on the outline data of each slice obtained by a computer. and,
A paper pattern for each slice portion is created from this recording paper, and the paper pattern is used to create the thin panels 4, 4. . . . are each cut out into a predetermined contour shape using a cutter and processed. In addition to this processing method, the thin plate panels 4, 4 can be processed directly from the outline data of each slice portion obtained by a computer using an NC processing machine or the like without using a paper pattern. . . . may be cut out into predetermined outline shapes.

Then, a plurality of thin plate-like panels 4, 4. ... are aligned with each other, and then bonded and polymerized with an adhesive to form the supporting part 5 of the mold model as shown in FIG. 3 (
S5). The mold model support part 5 has a mounting table part 5a supporting the mold model shaped part 3 in its center, and rib parts 5b, etc. are arranged around the mounting table part 5a. It becomes.

In this way, a plurality of thin plate panels 4, 4 . In the case of the method of forming the supporting part 5 of the mold model by polymerizing ..., the supporting part 5 is not formed entirely into a curved surface like the shaped part 3, so the thickness of the thin plate panel is It can be set relatively thick.

For this reason, when a computer slices the mold into multiple cross-sectional sections at a pitch corresponding to the thickness of the thin panel from the three-dimensional shape data of the mold and calculates the contour data of each slice, the calculation is relatively slow. It is easy to use, and requires less computing capacity and storage capacity of the computer, so a small computer is sufficient, and equipment costs can be reduced.

Also, based on this contour data, the thin plate panel 4゜4,・
... can also be processed in a short time because the number of panels is reduced.

Subsequently, as shown in FIG. 4, the shaped portions 3 are aligned and bonded with adhesive on the mounting base portions 5a of the support portions 5 of the mold model, which have been formed using different methods as described above. A mold model 6 is thereby formed (S6). After shaping this mold model 6 using sandpaper or the like, a mold is cast by full mold casting using the shaped mold model 6 (S7). In this full mold casting method, as is known, a mold model is buried in a mold crusher, then molten metal is injected into the mold crusher, and the heat of the molten metal burns out the mold model buried in the mold crusher. At the same time, a mold having a shape corresponding to the mold model is obtained by filling a cavity formed according to the external shape of the mold model with molten metal during mold crushing. Through the above steps, manufacturing of the mold is completed.

(Effect of the invention) As described above, according to the mold manufacturing method of the present invention,
When manufacturing a mold model, a shaped part of the mold model having a curved surface corresponding to the mold surface of the mold is formed by NC processing, and a supporting part without a curved surface is formed by polymerizing a plurality of thin plate-shaped panels. As a result, the amount of cutting by NC processing can be reduced, and the number of thin panels can be reduced, so the manufacturing time of the mold model can be shortened, and the accuracy of curved surface processing can be reduced. This can also contribute to improvements in performance and reduction in equipment costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a process diagram showing a method of manufacturing a mold, FIG. 2 is a perspective view showing a method of manufacturing a shaped part of a mold model, and FIG. 3 is a diagram of a mold. A perspective view of the support part of the model,
FIG. 4 is a perspective view showing a state in which the shaped part is placed on the support part of the mold model. 3... Shape part of the mold model, 4... Thin panel, 5
Support part of mold model.

Claims (1)

[Claims] (1) A manufacturing method of manufacturing a mold by full mold casting using a mold model, in which the shaped part of the mold model is shaped by NC processing, and a plurality of supporting parts of the mold model are formed. A method for manufacturing a mold, comprising forming thin plate-like panels by mutually polymerizing each other.