JPS6355411B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to numerically controlled cutting (hereinafter referred to as
This relates to a numerically controlled cutting manufacturing method for a master model for reversal, which is characterized in that it is assembled after being assembled (called NC cutting).

Conventional technology As shown in FIGS. 7 to 9, a conventional NC cutting manufacturing method for a reversal master model involves NC cutting a product shape part 32 and a mold matching surface 33 using one material. However, in this conventional NC cutting manufacturing method, the ball end mill cutter is the only NC cutting cutter that can be used when a part of the mold matching surface 32 is curved or inclined. When NC-cutting is performed, as shown in Figure 8, an uncut part 35 is created at the boundary between the product shape part 32 and the mold matching surface 33 by approximately the radius of the ball end mill cutter, so this uncut part 35 is removed later. The disadvantage is that the operator must cut with a chisel, cutter, etc.

Furthermore, there are disadvantages such as variations in quality due to individual differences in the cutting of uncut parts depending on the skill level of the operator, the finished shape is not very good, and the cutting time is long.

Problems to be Solved by the Invention This invention solves the problem of conventional inversion master model NC.
Eliminating these drawbacks of cutting manufacturing methods, NC
The purpose of this is to eliminate uncut parts from cutting, to produce products of high quality, and to shorten the manufacturing time of master models for reversal.

Means for Solving the Problems This invention creates a master model for reversal by separately NC-cutting a main body having a product-shaped part in the center and a block, and then assembling the block around the periphery of the product-shaped part. It is something.

Next, one embodiment of the NC cutting manufacturing method of a master model for reversal according to the present invention will be described with reference to FIGS. 1 to 6.

Example As shown in Fig. 2, the product shape part 2 is formed in the center of the main body 1 into a shape with an inclined rising surface 2' up to the parting line 2'' using a ball end mill cutter 3.
NC cutting.

Next, as shown in FIG. 3, the main body 1 is NC-cut using a flat end mill cutter 4 approximately vertically below the parting line 2'' to a predetermined height.

Each block 5 to 12 shown in FIG.
Among the blocks 5, 7, and 9 whose upper surfaces are curved or inclined, cut the upper surfaces with a ball end mill cutter.
In addition to NC cutting, the parts other than the top surfaces of blocks 5, 7, and 9 are NC cut using a flat end mill cutter. Other blocks 6, 8, 10, 11, 12
NC-cut the entire surface with a flat end mill cutter.

By gluing and assembling eight blocks 5 to 12 at predetermined positions on the peripheral edge 1' of the product-shaped portion 2 of the main body 1 with adhesive 13, a master model 14 for reversal is created as shown in FIG. .

Although the numerically controlled cutting manufacturing method of the reversal master model of this embodiment uses eight blocks, the number of blocks may be four, three, or one. In addition, the sixth method for assembling the block to the peripheral edge of the product-shaped part of the main body is
As shown in the figure, a protrusion 22 and a bolt hole 23 are provided on the peripheral edge 21' of the main body 21, and a positioning hole 25 and a bolt hole 26 corresponding to the protrusion 22 are provided on the block 24. ' and the block 24 may be positioned and fixed with bolts 27.

In the numerical control cutting manufacturing method of the reversal master model of this embodiment, the rising surface 2' of the product shape part 2 of the main body 1 is cut using the ball end mill cutter 3.
While cutting, parting line 2″ of main body 1
By performing NC cutting on the lower part using the flat end mill cutter 4, it is possible to eliminate uncut parts due to NC cutting. Furthermore, main body 1 and blocks 5 to 1
By cutting 2 with a plurality of NC cutting machines, the main body 1 and blocks 5 to 12 can be simultaneously cut using NC, thereby reducing the manufacturing time of the master model for reversal.

Effects of the Invention This invention involves NC-cutting a product-shaped part in the center of the main body, cutting it almost perpendicularly to a predetermined height below the parting line of the main body, and then cutting the product-shaped part in the peripheral part of the main body by NC cutting it almost vertically to a predetermined height below the parting line of the main body. This is an NC cutting manufacturing method for a master model for reversal, in which 1 to 8 blocks that are NC cut into a predetermined shape are assembled.
It is possible to eliminate uncut parts due to NC cutting, and since all cutting can be done by NC cutting, there is no individual difference between workers as in the conventional method, and the product is of good quality and has a good finished shape. You can build a master model.

Furthermore, the NC cutting manufacturing method of the reversing master model of this invention allows the main body and the block having the product shape to be simultaneously NC-cut using separate NC cutting machines, thereby reducing the manufacturing time of the reversing master model. can do.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the present invention before assembly, Fig. 2 is an enlarged cross-sectional view of the product-shaped part being cut, Fig. 3 is an enlarged cross-sectional view of the peripheral part being cut, and Fig. 4 is after assembly. 5 is a vertical sectional view of FIG. 4, FIG. 6 is a perspective view of a part of the main body and block, FIG. 7 is a perspective view of the conventional one, and FIG. 8 is an enlarged sectional view during cutting. FIG. 9 is a longitudinal sectional view of FIG. 7. 1 is the main body, 1' is the peripheral part, 2 is the product shape part,
2' is a rising surface, 2'' is a parting line, 3 is a ball end mill cutter, 4 is a flat end mill cutter, 5 to 12 are blocks, and 14 is a master model for reversal.

Claims (1)

[Scope of Claims] 1. In a numerically controlled cutting manufacturing method for a master model for reversal in which a product shape part is formed in the center, the peripheral edge of the product shape part is numerically controlled almost vertically to a predetermined depth below the parting line. Numerically controlled cutting of a master model for reversal, characterized in that one to eight blocks that have been cut and numerically controlled into a predetermined shape are assembled on the peripheral edge to form a mold matching surface. Manufacturing method. 2. A numerically controlled cutting manufacturing method for a reversal master model according to claim 1, wherein the mold mating surface is curved or inclined.