JPH0585254B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a mold for press working, etc., using full mold casting.

(Prior art) As one of the methods for manufacturing molds used in press working, casting, etc., a model of the mold to be manufactured is formed from styrofoam material, etc., and the obtained model is placed in mold sand. The model is buried in the molding sand and molten metal is poured into it, and the heat of the molten metal burns out the model buried in the molding sand, and the molten metal is filled into the cavity formed in the molding sand according to the external shape of the model. A full mold casting method is known in which a mold is obtained by forming a metal mold. In order to form a model used in such full mold casting, the shape of the mold to be manufactured is generally broken down into a plurality of three-dimensional constituent elements such as triangular prisms, square prisms, cylinders, etc. A plurality of model components corresponding to the three-dimensional components are formed, for example, from styrofoam material, and the resulting plurality of model components are combined as appropriate.

(Problems to be Solved by the Invention) However, as described above, by forming a plurality of model components and combining them, a model having a three-dimensional shape corresponding to the mold to be manufactured can be created. When forming a mold, the shape of the mold is decomposed into multiple three-dimensional components in order to obtain multiple model components. There is a problem in that a large number of man-hours are required to read out each of the plurality of three-dimensional constituent elements.

Furthermore, if the mold to be manufactured has a relatively complex three-dimensional shape, that shape will be decomposed into an extremely large number of three-dimensional components, and therefore the design of the mold will be difficult. Not only the work of reading out each of the plurality of three-dimensional constituent elements of the mold from the drawing, but also the work of forming model constituent elements corresponding to each three-dimensional constituent element, and the work of combining the formed model constituent elements. However, this method requires a large number of man-hours, prolongs the period required to manufacture the mold, and increases the manufacturing cost of the mold.

In view of the above, the present invention provides a method for relatively easily forming a model for full mold casting having a three-dimensional shape corresponding to the mold to be manufactured when manufacturing a mold using full mold casting. It is an object of the present invention to provide a method for casting a mold, which can shorten the period required for manufacturing the mold and reduce costs.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the method for manufacturing a mold according to the present invention provides a two-dimensional method for producing a mold that represents a plurality of types of exploded planar images and external planar images of the mold to be manufactured. A process of inputting graphic data into a processing unit, creating and storing three-dimensional data representing the entire image of the mold by the processing unit, and based on the created three-dimensional data representing the entire image of the mold, A process of obtaining cross-sectional shape data representing each of the first to Nth (N is a positive integer) parallel cross-sectional shapes obtained at each predetermined interval in the overall image of the mold, and each corresponding to the above-mentioned predetermined interval. The 1st to Nth plate-like bodies, which have a thickness of The process of obtaining a model material for mold casting, and the Mth (M is a positive integer smaller than N) plate-like body and the M+1-th plate-like body among the first to Nth plate-like bodies. A process of sequentially positioning and pasting one to the other for all the plate-shaped bodies from the first to the Nth plate to obtain a full-mold casting model corresponding to the overall image of the mold, and the obtained full-mold casting model. The process includes the step of manufacturing a mold by full mold casting using a casting model.

(Function) When a mold is manufactured based on the mold manufacturing method according to the present invention as described above, the arithmetic processing unit converts two-dimensional graphic data regarding the mold to be manufactured. Based on this, three-dimensional data representing the overall image of the mold is created, and based on the three-dimensional data, cross sections representing each of a plurality of parallel cross-sectional shapes obtained at predetermined intervals in the overall image of the mold are created. Shape data is required. continue,
Based on the cross-sectional shape data obtained by the arithmetic processing device in this way, for example, using a model material for full mold casting such as expanded polystyrene material, each of the plurality of parallel cross-sectional shapes whose external shape is represented by the cross-sectional shape data can be adjusted. In addition, a plurality of plate-like bodies having thicknesses corresponding to the above-mentioned predetermined intervals are formed. Next, a plurality of plate-like bodies are adhered one after another according to the order and with proper mutual alignment, so that the full-mold casting method corresponds to the overall shape of the mold to be manufactured. A model is obtained. Then, the obtained full mold casting model is used to manufacture a mold by full mold casting.

By doing this, the arithmetic processing device is utilized to obtain three-dimensional data representing the entire image of the mold to be manufactured, which is a relatively easy task, and furthermore, the three-dimensional data can be based on,
Cross-sectional shape data necessary to obtain a full-mold casting model that corresponds to the overall image of the mold can be obtained. Then, based on the cross-sectional shape data, a model for full mold casting that corresponds to the overall image of the mold is formed with high precision and relatively simple work. Therefore, molds are manufactured by full mold casting in order to shorten the period and reduce costs.

(Example) FIG. 2 shows the steps required to obtain a full mold casting model corresponding to the mold to be manufactured, which is used in carrying out an example of the mold manufacturing method according to the present invention. create and store data, and
A hardware system for displaying images based on created data is shown.

In the hardware system shown in FIG. 2, an arithmetic processing unit 2 is provided as the main pillar of the system. A keyboard 4, a mouse-type data input device (hereinafter simply referred to as a mouse) 5, and a tablet board 6 are connected to the arithmetic processing unit 2 as input means, and a hard disk device 7 for storing various data; An image display device 8 and a printing device 9 are connected as output means.

Using such a hardware system, a mold is manufactured according to an example of the method for manufacturing a mold according to the present invention, and at this time, the steps detailed below are carried out. Be taken.

In this procedure, first, three-dimensional data representing the entire image of the mold to be manufactured is obtained using the arithmetic processing device 2, and therefore, for example, as shown in FIG. 3A, three-dimensional data is obtained. , a substrate part 10 of the mold to be manufactured, and a bolt insertion part 12 into which bolts for attaching the mold to the processing machine are inserted.
Two-dimensional graphical data representing a decomposed planar image 20 including the above is input to the arithmetic processing unit 2 using the keyboard 4, mouse 5, and tablet board 6, and the arithmetic processing unit 2 is caused to perform arithmetic processing accordingly. The arithmetic processing unit 2 creates three-dimensional data representing an exploded three-dimensional image including the substrate portion 10 and bolt insertion portion 12 in the mold based on the two-dimensional graphic data representing the input exploded planar image 20, and In addition to storing the disassembled three-dimensional image represented by the three-dimensional data in the disk memory built into the hard disk device 7, the board section 10' and bolts are inserted as shown in FIG. 3B on the screen of the image display device 8. It is displayed as a wireframe model 20' including a section 12'.

Next, as shown in FIG. 4A, the substrate part 1 is
0. Input two-dimensional graphic data representing an exploded planar image 21 including the bolt insertion portion 12 and the main body portion 14 provided on the substrate portion 10 to the arithmetic processing unit 2 using the keyboard 4, mouse 5, and tablet board 6. Then, the arithmetic processing unit 2 is caused to perform arithmetic processing accordingly. Thereby, the arithmetic processing unit 2 creates three-dimensional data representing an exploded three-dimensional image including the board portion 10, the bolt insertion portion 12, and the main body portion 14 based on the two-dimensional graphic data representing the input exploded planar image 21. Then, it is stored in the disk memory built in the hard disk device 7, and the decomposed three-dimensional image represented by the three-dimensional data is displayed on the screen of the image display device 8 on the substrate section as shown in FIG. 4B. 10', bolt insertion part 1
2' and a main body 14'.

Subsequently, as shown in FIG. 5A, the substrate part 1 is
0. A side plate part 15 provided at one of the opposing ends of the substrate part 10, and a side plate part 15 provided at the other end of the opposing end of the board part 10, which engages with the mold to be manufactured during processing. The arithmetic processing unit 2 uses the keyboard 4, mouse 5, and tablet board 6 to process two-dimensional graphic data representing a decomposed planar image 22 including a guide portion 16 for mutual alignment with the mold.
, and causes the arithmetic processing unit 2 to perform arithmetic processing accordingly. Thereby, the arithmetic processing device 2
Based on the input two-dimensional graphic data representing the decomposed planar image 22, three-dimensional data representing the decomposed three-dimensional image including the substrate portion 10, the side plate portion 15, and the guide portion 16 is created, and the three-dimensional data is stored in the hard disk device 7. In addition to storing the data in the disk memory,
The resolved three-dimensional image represented by the three-dimensional data is displayed on the screen of the image display device 8 as shown in FIG.
A wire frame model 2 including a base plate part 10', a side plate part 15' and a guide part 16' as shown in FIG.
2'.

Further, as shown in FIG. 6A, the substrate part 1
0, the main body 14 and the two-dimensional graphic data representing the decomposed planar image 23 including the plurality of ribs 18 provided on the substrate 10 and reinforcing the main body 14 are transferred to the keyboard 4, the mouse 5, and the tablet board. 6
The information is input to the arithmetic processing unit 2 using the arithmetic processing unit 2, and the arithmetic processing unit 2 is caused to perform arithmetic processing accordingly. Thereby, the arithmetic processing device 2 processes the input resolved plane image 2.
Based on the two-dimensional figure data representing 3, three-dimensional data representing an exploded three-dimensional image including the substrate portion 10, the main body portion 14, and the rib portion 18 is created, and the three-dimensional data is stored in a disk memory built in the hard disk device 7. At the same time, the decomposed three-dimensional image represented by the three-dimensional data is displayed on the screen of the image display device 8, as shown in FIG. It is displayed as model 23'.

Further, as shown in FIG. 7A, the substrate portion 1
0, bolt insertion part 12, main body part 14, side plate part 1
5. Enter the two-dimensional graphic data representing the external planar image 24 of the mold, which includes the partition wall part 14a arranged inside the main body part 14 in addition to the guide part 16 and the rib part 18, on the keyboard 4, input to the arithmetic processing device 2 using the mouse 5 and tablet board 6;
The arithmetic processing device 2 is caused to perform arithmetic processing in accordance with the processing. Thereby, the arithmetic processing device 2 calculates the base plate portion 10, the bolt insertion portion 12, the main body portion 14, the side plate portion 15, the guide portion 16, the rib portion 18 based on the input two-dimensional graphic data representing the external appearance planar image 24. 3-dimensional data representing the entire mold including the partition wall portion 14a is created and stored in the disk memory built in the hard disk device 7, and the entire mold represented by the 3-dimensional data is created. The image is displayed on the screen of the image display device 8 on the substrate part 1 as shown in FIG. 7B.
0', a bolt insertion part 12', a main body part 14', a side plate part 15', a guide part 16', a rib part 18', and a partition part 14a'.

In this way, the wire frame model 24' is displayed on the screen of the image display device 8.
After creating the 3D data representing the overall image of the mold shown as , wireframe model 2
In order to eliminate the unnecessary lines seen in 4', the appearance plane is obtained by erasing unnecessary lines from the appearance plane image 24 shown in FIG. 7A, as shown in FIG. 8A. The two-dimensional graphic data representing the image 26 is stored on the keyboard 4, mouse 5, and tablet board 6.
The information is input to the arithmetic processing unit 2 using the arithmetic processing unit 2, and the arithmetic processing unit 2 is caused to perform arithmetic processing accordingly. Thereby, the arithmetic processing device 2 outputs the input external plane image 2.
Based on the two-dimensional figure data representing 6, create three-dimensional data representing the entire modification of the mold,
The data is stored in the disk memory built into the hard disk device 7, and the overall image of the mold modification represented by the three-dimensional data is displayed on the screen of the image display device 8 as shown in FIG. 8B. A wire frame model 26' obtained by removing unnecessary joining lines and the like from the wire frame model 24' shown in FIG. 7B is displayed.

Through the operations described above, three-dimensional data representing the overall image of the mold as shown as the wire frame model 26' in FIG. 8B is created, and the three-dimensional data is stored in the hard disk device 7. The process of storing in the disk memory is completed.

Next, by operating the keyboard 4, the arithmetic processing unit 2 displays the wire frame model 26' shown in FIG.
Find cross-sectional shape data representing each of the first to Nth parallel cross-sectional shapes obtained at predetermined intervals S from one end surface to the other end surface in the overall image of the mold as shown in Perform arithmetic processing. At this time, the arithmetic processing unit 2 generates the entire mold as shown as the wire frame model 26' in FIG. 8B based on the final three-dimensional data stored in the disk memory built in the hard disk device 7. 1 obtained for each interval S between one end surface and the other end surface in the image
Parallel cross-sectional shapes from the th to the Nth are set in sequence. Then, cross-sectional shape data representing each of the set parallel cross-sectional shapes are formed and stored in the disk memory built in the hard disk device 7, and the first to Nth cross-sectional shape data represented by these cross-sectional shape data are An overall image of the mold with a parallel cross-sectional shape is displayed on the screen of the image display device 8, as shown in FIG.
It is displayed as a wire frame model 28 including first to Nth parallel cross-sectional shapes D ₁ , D ₂ , D ₃ , . . . , D _N sequentially arranged with an interval S.

In this way, the arithmetic processing unit 2 is operated and the parallel cross-sectional shapes D ₁ , D ₂ , D ₃ , ...D _N shown in the wire frame model 28 of FIG. Obtain cross-sectional shape data representing each of the N-th parallel cross-sectional shapes,
After storing them in the disk memory built in the hard disk device 7, the keyboard 4 is operated to activate the printing device 9, and based on the cross-sectional shape data stored in the disk memory built in the hard disk device 7, the first In the wire frame model 28 shown in the figure, parallel cross-sectional shapes D ₁ , D ₂ , D ₃ ,
...1 in the overall image of the mold, denoted as D _N
Draw each of the parallel cross-sectional shapes from the th to the Nth on the recording paper. Then, each parallel cross-sectional shape is cut out from each of the recording sheets on which the first to Nth parallel cross-sectional shapes obtained from the printing device 9 are drawn, and the first to Nth parallel cross-sectional shapes in the overall image of the mold are cut out. N paper patterns are formed, each corresponding to a parallel cross-sectional shape. At that time, on the surface of each pattern, draw as much as possible the outline of the pattern corresponding to the next parallel cross-sectional shape adjacent to the parallel cross-sectional shape corresponding to that pattern, with alignment. put.

FIGS. 9A, B, and C show paper patterns K 1 and K corresponding to the first to third parallel cross-sectional shapes in the overall image of the mold, respectively, among the N paper patterns formed as described _above . ₂ and K ₃ are shown. On the surface of pattern K ₁ , the contour line ΔK ₂ of the next pattern K ₂ is drawn with alignment, and on the surface of pattern K ₃ , the contour line ΔK 2 of the next pattern K ₄ is drawn. The contour line ΔK ₄ is drawn with alignment. On the other hand, no contour line is drawn on the surface of the pattern _K2 because the next pattern _K3 has the same shape as the pattern _K2 .

Next, using N paper patterns corresponding to the first to Nth parallel cross-sectional shapes in the overall image of the mold, which were formed as described above, each pattern is made from the model material for full mold casting. The first to Nth plate-like bodies are formed, each having a thickness corresponding to the interval S and an outer shape corresponding to the contour shape of each of the N paper patterns. At this time, for example, a foamed polystyrene plate material having a thickness corresponding to the spacing S is used as the model material for full mold casting.

Then, as shown in FIG. 10A, the pattern K ₁ is placed on the surface of the Styrofoam board 40 whose thickness corresponds to the distance S, and the Styrofoam board 40 is
Using the cutter 42, cut out along the outline of the paper pattern _K1 . In addition, the contour line ΔK ₂ drawn on the paper pattern K ₁ is applied to the cut out Styrofoam plate material 40.
Mark along the lines using a scribing needle, etc. As a result, as shown in FIG. 11A, the mold has a thickness corresponding to the interval S and an external shape corresponding to the first parallel cross-sectional shape in the overall image of the mold, and a marking line ΔP ₂ is provided. A plate-like body _P1 is obtained.

Subsequently, as shown in FIG. 10B, a pattern K ₂ is placed on the surface of the Styrofoam board 40 whose thickness corresponds to the distance S, and the Styrofoam board 40 is
Using the cutter 42, cut out along the outline of the paper pattern _K2 . As a result, a plate-like body _P2 having a thickness corresponding to the interval S and an external shape corresponding to the second parallel cross-sectional shape in the overall image of the mold, as shown in FIG. 11B, is obtained.

Furthermore, as _shown in FIG.
Using the cutter 42, cut out along the outline of the paper pattern _K3 . In addition, the contour line ΔK ₄ drawn on the paper pattern K ₄ is drawn on the cut out Styrofoam plate material 40.
Mark along the lines using a scribing needle, etc. As a result, as shown in FIG. 11C, the mold has a thickness corresponding to the interval S and an external shape corresponding to the third parallel cross-sectional shape in the overall image of the mold, and a marking line ΔP ₄ is provided. A plate-like body P ₃ is obtained.

After that, the same operation as described above is performed using each of the paper patterns from _K4 onwards, and a plate having a thickness corresponding to the interval S and an external shape corresponding to the Nth parallel cross-sectional shape in the overall image of the mold is created. Total N up to P _N
plate-like bodies P ₁ to P _N are obtained.

Next, the plate-like bodies P ₁ to P _N obtained as described above
Each of these is aligned using the marking lines provided on each, and then pasted in sequence.

That is, for a plate-shaped body P ₁ having an external shape corresponding to the first parallel cross-sectional shape in the overall image of the mold as shown in FIG. 11A, FIG.
A plate-shaped body P ₂ having an external shape corresponding to the second parallel cross-sectional shape in _the overall image of the mold as shown in _FIG . After aligning, securely attach with adhesive.

Next, a plate-shaped body as shown in FIG. 11B
Figure 11 C for the plate-shaped body P ₂ attached to P ₁ .
After aligning the plate-shaped body _P3 , which has an external shape corresponding to the third parallel cross-sectional shape in the overall image of the mold, by matching the external lines of the two as shown in FIG. , securely attached with adhesive.

Thereafter, in the same manner, each plate-like body up to plate-like body P _N having an external shape corresponding to the Nth parallel cross-sectional shape in the overall image of the mold is successively pasted,
A full mold casting model 50 as shown in FIG. 12 is formed by stacking a total of N plate-like bodies P ₁ to P _N. This full mold casting model 50 consists of the first to Nth casters arranged in sequence with an interval S as shown in FIG. 1 above.
This corresponds to the wire frame model 28 including the parallel cross-sectional shapes D ₁ , D ₂ , D _{3 ,} .

Then, after shaping the full mold casting model 50 formed as described above using sandpaper or the like, full mold casting is performed using the shaped full mold casting model 50. , manufacture molds. In such full mold casting, a shaped full mold casting model 5 is used.
0 is buried in the molding sand, molten metal is injected into the molding sand, and the full mold casting model 50 buried in the molding sand is burnt out by the heat of the molten metal. By filling the cavity formed according to the external shape of the full mold casting model 50 with molten metal, the base plate 10, the bolt insertion hole 12, and the partition wall 14a are formed inside thereof, as shown in FIG. A mold 60 is obtained, which includes the main body portion 14, side plate portions 15, guide portions 16, rib portions 18, and the like.

In the above example, in order to obtain the N plate-like bodies P ₁ to P _N , the arithmetic processing unit 2 is operated to obtain the parallel cross-sectional shapes D ₁ , D ₂ , D ₃ in the wire frame model 28 of FIG. ...Parallel cross-sectional shapes _D 1 , D in the wire frame model ₂₈ of FIG. N paper patterns corresponding to the first to Nth parallel cross-sectional shapes in the overall image of the mold, indicated as ₂ , D ₃ , ...D _N , are formed, and these are used to cut out the Styrofoam plate material. However, it is also conceivable to obtain the N plate-like bodies P ₁ to P _N using an automatic cutting device that cuts Styrofoam plate material or the like without using such a paper pattern.

In such a case, first, for example, a floppy disk drive device is connected to the arithmetic processing device 2, and the first to Nth images of the entire mold image stored in the disk memory of the hard disk device 7 are displayed. Each piece of cross-sectional shape data representing each parallel cross-sectional shape is loaded onto the floppy disk. Then, each of the cross-sectional shape data loaded onto the floppy disk is converted into control data for the automatic cutting device, and the operation of the automatic cutting device is controlled based on the control data. Under such circumstances, the automatic cutting device is assumed to automatically cut out N plate-shaped bodies P ₁ to P _N from the styrofoam plate material.

In addition, in the above example, in order to perform positioning when sequentially pasting the first to Nth plate-like bodies formed from the styrofoam plate material 40 with a thickness corresponding to the interval S, each plate-like body is On the surface of the board, a scribing line is formed that corresponds to the outline shape of the next plate-shaped object, but for example, if the outline shape of the next plate-shaped object is larger, it is difficult to draw a scribing line. There may be cases where this is not possible. In such a case, draw two points in the mutually overlapping plane between two consecutive plate-shaped bodies, and
By superimposing the points, the plate-like body P ₁ ~
It is also possible to perform positioning when pasting each of P _{and N.}

(Effects of the Invention) As is clear from the above explanation, according to the method for manufacturing a mold according to the present invention, when manufacturing a mold using full mold casting, an arithmetic processing device is utilized and relatively Although it is an easy task, it is possible to obtain 3D data that represents the overall image of the mold to be manufactured, and furthermore, based on this 3D data, a model for full mold casting that corresponds to the overall image of the mold can be created. This means that the cross-sectional shape data necessary to obtain this information can be obtained. Then, based on the cross-sectional shape data, a model for full mold casting that corresponds to the overall image of the mold is created.
It can be formed with high precision using relatively simple work.
Therefore, molds are manufactured by full mold casting in order to shorten the period and reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a wire frame model obtained by an image display device for explaining the implementation process of an example of the mold manufacturing method according to the present invention;
FIG. 2 is a schematic configuration diagram showing a hardware system used to implement an example of the mold manufacturing method according to the present invention, FIG. 3 A and B, FIG. 4 A and B, and FIG. 5 A and B. , and FIGS. 6A and 6B are diagrams for explaining the process of creating and storing three-dimensional data representing a mold in an example of the mold manufacturing method according to the present invention, and FIGS. 7A and B , and FIGS. 8A and 8B are diagrams for explaining three-dimensional data representing the overall image of a mold in an example of the mold manufacturing method according to the present invention, and FIGS. 9A, B, and C, and FIGS. 10 Figure A,
B and C and FIG. 11 are diagrams for explaining the process of forming a model for full mold casting in an example of the method for manufacturing a mold according to the present invention, and FIG. A schematic perspective view showing an example of a full mold casting model formed in the process of an example of the manufacturing method, and FIG. 13 is a perspective view showing an example of a mold manufactured by an example of the mold manufacturing method according to the present invention. It is a diagram. In the figure, 2 is an arithmetic processing unit, 4 is a keyboard, and 5
1 is a mouse type data input device, 7 is a hard disk device, 8 is an image display device, 40 is a foamed polystyrene plate, 42 is a cutter, 50 is a model for full mold casting, and 60 is a mold.

Claims (1)

[Claims] 1. Two-dimensional graphic data representing multiple types of exploded planar images and external planar images of the mold to be manufactured are input to a processing device, and the processing device generates three-dimensional data representing the overall image of the mold. Represents each of the first to Nth (N is a positive integer) parallel cross-sectional shapes obtained at predetermined intervals in the overall image of the mold based on the creation and storage process and the three-dimensional data. The step of obtaining cross-sectional shape data, and the process of obtaining model materials for full mold casting, each having a thickness corresponding to the above-mentioned predetermined interval, and having external shapes from the first to the N-th that are represented by the above-mentioned cross-sectional shape data. A step of obtaining the first to Nth plate-like bodies corresponding to each of the parallel cross-sectional shapes, and M (M is a positive value smaller than N) of the first to Nth plate-like bodies. The positioning and attachment of one of the (integer)-th plate-like body and the M+1-th plate-like body to the other is performed sequentially for all of the above-mentioned 1st to Nth plate-like bodies, and a complete mold corresponding to the entire image of the mold is formed. A method for manufacturing a mold comprising the steps of: forming a model for mold casting; and manufacturing the mold by full mold casting using the full mold casting model.