JPH044943A - Manufacture of mold - Google Patents

Abstract

PURPOSE:To remarkably improve shape accuracy of pattern face to be made by assuming model finely divided with width corresponding to diameter of bar-like member with plural bar-like members on a surface plate and superposing such the pre-assemblies in order. CONSTITUTION:Based on shape data for the pattern face to be made, the bar- like members 2 at the prescribed waiting position are taken out with a line-up robot 5 and plural pieces of these are lined up in one lines on the surface plate. While making a part of the pattern face on one end face of these plural bar-like members, the pre-assembly 13 of bar-like members is made. The pre-assembly composed of plural pieces of the bvar-like members is conveyed to superposing position in one lump at every times with a handling robot 6 to make the prescribed pattern face with assembly of the pre-assemblies. By this method, the positional accuracy error for each bar-like member is small and the shape accuracy for the pattern face to be made is remarkably improved. Further, as the bar-like members are mutually brought into close contact, by directly pouring molten metal in the made pattern face, a rolling over mold can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a mold, and particularly to a method for manufacturing a mold suitable for use as a model when manufacturing a press mold or a mold for resin molding. .

Conventional technology In order to reduce the number of man-hours and time required to produce molds such as press molds, the mold itself is made from an assembly of rod-shaped members, and an arbitrary mold surface shape can be created on one end surface of the assembly. For example, the technique is disclosed in JP-A-56-36343, JP-A-61-47217, and JP-A-61-2767.
It is known from Publication No. 41 and the like.

In all of these conventional techniques, each rod-shaped member constituting the aggregate as a whole is displaced in the axial direction by an ultrasonic vibrator or other driving means in a predetermined restraint state, and one end face of the aggregate is moved. The basic idea is to create an arbitrary mold surface shape corresponding to the envelope surface of the tip of each rod-shaped member.

Problems to be Solved by the Invention In the conventional mold manufacturing technology as described above, the method is to displace each of the rod-shaped members, which are assembled in advance and in a predetermined restrained state, in the axial direction. When a member is displaced, several rod-like members adjacent to it move simultaneously due to frictional force, and there is a limit to the improvement in the shape accuracy of the created mold surface.

Furthermore, if a predetermined gap is provided between adjacent rod-like members as in JP-A-61276741, for example, several rod-like members will not move at the same time.
As a result, the aggregate density of the rod-like members is low by the gap (as a result, the shape accuracy of the mold surface created similarly to the above is reduced).

However, if there is a gap between adjacent rod-shaped members, it cannot be applied to a mold manufacturing method in which, for example, a created mold surface is used as a model and molten metal is poured into it to produce an inverted mold.

The present invention was made in view of the above problems.
The purpose is to provide a method that not only improves the precision of the mold surface shape but also can sufficiently handle the production of inverted molds as described above.

Means for Solving the Problems The present invention is a mold manufacturing method in which a large number of rod-like members are assembled in a predetermined positional relationship, and a surface created on one end surface of the assembly is formed into a mold surface shape. Then, based on the shape data of the mold surface to be created, the alignment robot takes out the rod-like members at a predetermined standby position and arranges them in a row on the surface plate, thereby forming a mold on one end surface of the rod-like members. A process of creating a preliminary assembly of rod-shaped members while creating a part of the surface, and a process of creating a preliminary assembly of rod-shaped members each time by transporting the preliminary assembly consisting of a plurality of rod-shaped members to a stacking position by a handling robot and stacking them one after another. The method includes the step of creating a predetermined model surface by a collection of bodies.

According to this method, assuming a case where a mold having a predetermined mold surface shape is finely divided into widths corresponding to the thickness of a rod-shaped member, first, a pre-assembled body corresponding to the thickness of the rod-shaped member is formed using a plurality of rod-shaped members. A mold having a predetermined mold surface shape is manufactured by sequentially stacking such preliminary assemblies on a surface plate.

Embodiment FIG. 1 is a schematic explanatory diagram of a mold manufacturing system using the method of the present invention.

In Figure 1, ■ indicates prismatic bars 2, 2 of the same size.
. . . is housed in a magazine, 3 is a constant 11ff, and 4 is a loading device. Further, 5 is an alignment robot, 6 is a handling robot, 7 and 8 are robot controllers, and 9 is a main control device.

The bars 2 housed in the magazine 1 are aligned one by one by a stopper 10 and a pusher 11, and then gripped by the hand 12 of the alignment robot 5, and the alignment robot 5 places the bars 2 on the surface plate 3. line up at the specified position.

When the number of bars 2 on the surface plate 3 reaches a specified number, the hand 14 of the handling robot 6 grasps the preliminary assembly 13 consisting of the plurality of bars 2, 2, . . . The handling robot 6 stacks the preassembly 13 at a designated position on the loading device 4.

As shown in FIG. 2, the surface plate 3 includes a pedestal 16 provided on a main body 15 and a pair of pushers 17 and 18 facing each other with the pedestal 16 in between. One button shear 17 has a comb-shaped finger 20 that moves forward and backward by the action of a cylinder 19, while the other button shear 18 has a button plate 22 that moves forward and back by the action of a cylinder 21. have. As the cylinder 21, one having a larger capacity than the cylinder 19 is used.

Therefore, as shown in FIGS. 3 and 4, when a predetermined number of bars 2 are arranged on the pedestal 16 by the alignment robot 5, the butcher plate 22 moves forward until it comes into contact with the side surface of the pedestal 16. At the same time, the fingers 20 also move forward, and the plurality of bars 2 are moved forward with respect to the butcher plate 22.
, 2... are aligned in close contact with each other, thereby obtaining a preliminary assembly I3 consisting of a plurality of bars 2, 2....

As shown in FIGS. 1 and 5, the loading device 4 loads the substrate 2.
3 and four side plates 24.25 and 26.27 erected on this board 23, and one of the four side plates 24.25, 26.27
The side plate 25 is a pre-assembly 1 from the surface plate 3 to the loading device 4.
It has been removed so that it will not become an obstacle when loading the 3. Moreover, movable pressing plates 29 and 30 are provided inside the side plates 25 and 26.

Therefore, the preliminary assemblies 13 produced on the surface plate 3 are stacked one after another while their positions in the width direction are regulated by the pair of side plates 26 and 27.

The alignment robot 5 arranges the bars 2, 2, etc. in a two-dimensional manner at specified positions based on the shape data of the mold surface to be created. A part of the type surface to be created is created.

Similarly, the handling robot 6 stacks the preliminary assembly 13 at a designated position on the loading device 4 based on the shape data of the mold surface.

Therefore, as mentioned above, the alignment Roho on the surface plate 3, To 5
By repeating the process of arranging the bars 2, 2, etc. and loading the preliminary assembly 13 from the surface plate 3 to the loading device 4 several times, the preliminary assembly 13 is assembled on the loading device 4. As a result, a mold 31 is formed by the aggregate of the bars 2, 2, etc. as shown in FIGS. 5 and 6, and the envelope surface of the tip of each bar 2, 2, etc. A mold surface 32 with a predetermined shape corresponding to the above is created.

More specifically, as shown in FIGS. 7 and 8, for example, based on the shape data of the press mold 37 to be manufactured,
The mold shape is subdivided into (Q, m, n) meshes using cutting lines substantially perpendicular to the mold surface 38.

However, n: the number of bars 2 that the handling robot 6 carries from the surface plate 3 to the loading device 4 at one time (the number of bars 2 required to make the preliminary assembly 13) m: the number of bars 2 that the handling robot 6 carries on the loading device 4 The number of times the handling robot 6 is required to stack the bars 2 in one stage (-the number of preliminary assemblies 13 required to stack the bars 2 in one stage) e: The number of stages of stacking the bars 2 necessary to create the mold shape.

Then, while determining the three-dimensional coordinate position in the X, Y, and Z directions of the nkth bar 2 of the preliminary assembly 13 at the position specified by (Q□, mJ), the three-dimensional coordinate position is specified. The position of the bar 2 on the surface plate 3 is determined, and the alignment robot 5
The bars 2 are arranged at designated positions on the surface plate 3.

The work of arranging the bars 2 on the surface plate 3 is = n
As shown in Figure 9, (σl+
Since the preliminary assembly 13 at the position specified by mJ) is produced on the surface plate 3, this (Q,.

The position of the preliminary assembly 13 specified by mJ) on the formwork 28 is determined. After that, the handling robot 6 handles the n bars 2, 2, . . .
The materials are placed in bulk onto the formwork 28 and stacked as shown in FIG. 10.

This operation of stacking the bars 2 from the surface plate 3 to the formwork 28 is repeated until j=m and i=Q.

Once a predetermined number of bars 2, 2... are loaded onto the formwork 28, the side plates 25 shown in FIG. 1 are assembled, and
As shown in FIGS. 5 and 6, the suppression plates 29 and 30 are tightened with bolts 33, and a mold surface 32 is created on one end surface of the mold 31 made of an aggregate of a large number of bars 2, 2, . . . The entire bar material 2, 2... is pressurized and restrained so that its shape does not collapse. Here, the shape of the created mold surface 32 is the eighth
This is an approximate shape obtained by transferring and inverting the mold surface 38 shown in the figure.

After this, the mold surface 3 of the mold 31 produced as described above
A molten metal 34 is poured onto the mold 2 as shown in FIG. 6, and is cooled and solidified to obtain an inverted mold 35 on which the mold surface 32 is transferred as shown in FIG.

This inverted die 35 is finished into a press die 37 having the shape shown in FIG. 8 by cutting in a later process, but since the die surface 36 of the inverted die 35 is a transfer of the die surface 32, it is relatively a final product. The shape is close to that of the original shape, so it can be finished into a predetermined shape with only minimal cutting.

Here, in the above embodiment, an example was shown in which the inverted mold 35 was produced by pouring the molten metal 34 into the mold surface 32, but by the same method, for example, styrene beads were poured into the mold surface 32 to form a foamed polystyrene for mold production. It is also possible to create a vanishing model.

12 and 13 show other embodiments of the invention,
In this embodiment, hexagonal columnar rods 43, 43, . The preliminary assembly 44 consisting of the following is sequentially loaded into a formwork 45 of a loading device.

In the case of this embodiment, the same effects as in the first embodiment can be obtained, and in addition, as shown in FIG. 13, by incorporating a round bar-shaped bar 46 in a part, a gap 47 is created around it. Therefore, for example, as described above, when pouring molten metal, the above-mentioned gap can be used as a gas vent hole.

Effects of the Invention As described above, according to the present invention, a plurality of rod-like members are arranged on a surface plate in advance to prepare a pre-assembly, and then the pre-assembly is sequentially carried to a loading position and stacked. Compared to the conventional method of displacing the bar-shaped members in the constrained state one by one, the error in the positional accuracy of each bar-shaped member is small, and the shape precision of the created mold surface is significantly improved.

In addition, since the rod-shaped members are in perfect contact with each other, this also improves the shape accuracy of the mold surface. For example, it is possible to create an inverted mold by directly pouring molten metal into the created mold surface. It becomes possible.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing the configuration of a mold manufacturing system using the present invention, Fig. 2 is a perspective view of the surface plate, Fig. 3 is a plan view of the main part of Fig. 2, and Fig. 4 is Fig. 3. Sectional view along line ■■, No. 5
The figure is a front explanatory view of the loading device, and Figure 6 is ■-VI of Figure 5.
7 is a flowchart for explaining the operation during bar loading in FIG. 1, FIG. 8 is a perspective view of the manufactured mold, and FIG. 9 is a perspective view of the preliminary assembly. , 10th
The figure is a front explanatory view of the loading device in the middle of loading bar material, No. 11
The figure is a sectional view of an inverted mold produced by transferring from a mold, and FIG. 12 is a perspective view of a surface plate showing another embodiment of the present invention. 1...Magazine, 3.41...Surface plate, 6...Hand mounting assembly, 28° shaped surface. Figure 13 is also a front explanatory diagram of the loading device 2.43...
Bar material (rod-shaped member), 4... Loading device, 5... Alignment robot. Robot, 13.44...Preliminary 45...Formwork, 31...Mold, 32...1 etc.Figure 2Figure 3Figure 4Figure 12Figure 18

Claims (1)

[Claims] (1) A mold manufacturing method in which a large number of rod-shaped members are assembled in a predetermined positional relationship, and a surface created on one end surface of the assembly is a mold surface shape, the method comprising: Based on the shape data, an alignment robot takes out the bar-like members at a predetermined standby position and arranges them in a line on a surface plate, thereby creating a part of the mold surface on one end surface of the plurality of bar-like members. A process of producing a preliminary assembly of rod-shaped members, and a process of transporting the preliminary assembly consisting of a plurality of rod-shaped members in batches each time to a stacking position by a handling robot and stacking them one after another, and forming a predetermined mold surface by assembling the preliminary assemblies. A mold manufacturing method characterized by comprising: a step of creating a mold.