JPH11277374A - Finishing method for work molding face of mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make up the work molding face of a mold mechanically in a short time with a high accuracy without relying on experienced workers as before. SOLUTION: A primary processing face C is molded in a mold, and the primary molding face C is measured by a displacement sensor 8. A reference circle coming in contact with a given point P1 is described by the displacement sensor 8. A reference radius R is led out of the reference circle, and the amount of displacement Δ between the reference radius R and the primary processing face C is computed every specified angle. The distance CL of the primary processing face C is computed every specified angle based on the sum of the amount of displacement and the difference between the displacement and the radius. The farmost point P4 of the primary processing face C is computed based on every difference in specified angle between the distance CL of the work forming face. The farmost point P4 is made to be a starting point, and a processing fixture 7 is moved in a form of a figure similar to the work forming face C from the farmost point P4, so that the primary processing face C is processed so as to be finished up to the work molding face A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding for forming a work shape when manufacturing a molding die for forming a material such as a metal, a non-ferrous metal, a synthetic resin or the like as a work by casting or press molding. The present invention relates to a method of finishing a work forming surface of a mold and a method of inspecting a finished dimension of a processed work forming surface finished by the finishing method.

[0002]

2. Description of the Related Art In casting or press molding using a mold such as a mold, an outer peripheral surface and an inner peripheral surface of a mold are formed with a work forming surface for forming a shape of a work as a molded product. Become. For example, when the work is a ring body such as Baumkuchen, the outer peripheral surface of the work is formed by the inner peripheral surface of the mold.
Similarly, the inner peripheral surface of the work is formed by the outer peripheral surface of the mold.

[0003] Further, in the case where the formed work is directly formed into a product shape without performing post-processing such as cutting or polishing on the formed work, the outer circumferential surface or inner circumferential surface of a forming die which is a work forming surface. Needs to be finished with high precision, especially when the work as formed has a fitting relationship with other parts, higher dimensional accuracy is required.

[0004] Further, when the shape or thickness of the reinforcing ribs, uneven portions, openings, etc., of the work is changed, the flow rate of the molten metal at the time of pouring is changed, and the shrinkage rate due to cooling after forming is reduced for each part. Therefore, the work can be formed with the dimensional accuracy as designed by manufacturing the work forming surface in consideration of such a change during and after the forming in advance. Therefore, even when the workpiece forming surface looks almost perfectly circular to the naked eye, it actually becomes a non-circular shape such as a chrysanthemum shape or an elliptical shape having a minute shape change of 1/1000 mm unit for each part. Often.

[0005]

In the production of such a molding die, it is difficult to control a minute amount of the work forming surface, and the number of pieces is not so much required, so that development costs and manufacturing costs are reduced to mass-produced products. It is not suitable for industrial production, which sorts out product costs. For this reason, at present it relies on the hand of a skilled craftsman, but the production cost per mold is high, and the production period is long, and the more delicate and complex the shape of the work formation surface becomes, However, it took much more time and cost to manufacture. Further, when a plurality of molds are manufactured by the hand of a craftsman, the size and shape of the work forming surface may be slightly different in each of the molds.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a mold with a highly accurate work forming surface in a short time without relying on the hand of a skilled craftsman. An object of the present invention is to provide an inexpensive method for finishing a work forming surface of a molding die which can be mechanically manufactured by using the method described above.

[0007]

According to the above object, according to the first aspect of the present invention, an outer peripheral surface or an inner peripheral surface of a molding die is used as a work forming surface, and the work forming surface is formed by using a processing means such as an NC processing machine. A method for finishing a work forming surface of a molding die, wherein a primary working surface machined while leaving a cutting allowance of an arbitrary thickness is finished to a predetermined work forming surface set in advance by a control means, A gripping means for selectively turning a processing tool and a displacement sensor around a central axis is connected to a rotary encoder attached to the means, and the control means has a distance from the central axis of the gripping means to the workpiece forming surface. Is input at predetermined angles around the central axis of the gripping means, the molding die is fixed on the table of the processing means, and the processing tool is turned around the central axis of the gripping means to form the mold. Form the primary working surface on the mold At the same time, by rotating the displacement sensor around the central axis of the gripping means and tracing the primary processing surface with the displacement sensor, the displacement sensor and the rotary encoder measure the primary processing surface at every predetermined angle. Output the measured dimensions of the primary processing surface to the control means,
A measuring means is arranged on a table of the processing means, and the displacement sensor is turned around a central axis of the gripping means at least in a size in contact with any one point of the primary processing surface, and from a locus drawn by the displacement sensor The data for deriving the reference circle is measured by the measuring means, and the data is output to the control means. The control means derives a reference circle from the data and sets the center axis of the gripping means from the reference circle. A reference radius of 基準 of a reference circle as a center is derived, and a displacement amount between the reference radius and the shape and dimension of the primary processing surface is calculated for each of the predetermined angles, and the sum of the displacement amount and the reference radius or From the difference, the distance from the central axis of the gripping means to the primary processing surface is calculated for each predetermined angle, and the difference between the distance of the primary processing surface and the distance of the work forming surface for each predetermined angle is calculated from the difference to the work forming surface. Of the primary processing surface with the longest A point is determined, and the processing tool gripped by the gripping means is positioned at the farthest point with the farthest point as a processing start point, and the processing tool is moved from the farthest point to a shape similar to the workpiece forming surface. And finishing the primary processing surface to the work forming surface.

[0008] In the second aspect of the present invention, the first aspect is provided.
After the work forming surface is finished by the work forming surface finishing method of the forming die, the displacement sensor is turned around the central axis of the gripping means, and the work forming surface is traced by the displacement sensor. The finishing dimension of the forming surface is output to the control means, and the finishing dimension of the workpiece forming surface is compared with the set dimension.If the finishing dimension of the workpiece forming surface is within the allowable range of the set dimension, the processing is terminated. If the finished size is not within the allowable range of the set size, the work forming surface is reworked by the working tool.

According to the first or second aspect of the present invention, the finishing of the work forming surface is performed while the forming die is fixed to the table of the processing means, and after the finishing of the work forming surface is completed, the forming die is finished. Is removed from the table. The work forming surface of the mold can be finished even if it is an elliptical shape other than a circle or a polygon as long as it is a peripheral surface shape. In any case, the center axis of the gripping means is located within the work forming surface. Are set, and the reference radius, the displacement, the distance between the workpiece forming surface and the primary processing surface, the predetermined angle, and the farthest point of the primary processing surface are determined based on the central axis.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a flowchart showing a processing procedure of the first embodiment, FIGS. 2 to 6 are operation explanatory diagrams of a processing apparatus used for the main processing, FIG. 7 is a plan view for explaining a measuring state by a measuring means, and FIG. FIG. 4 is a plan view for explaining dimension setting during processing.

In this embodiment, the data of the work forming surface A designed in advance is set in the control means 1, and an arbitrary thickness is formed on the work forming surface A by using the processing means 3 on the outer peripheral surface of the molding die 2. After forming the primary processing surface C leaving the cutting allowance B, the primary processing surface C is precisely finished according to the work forming surface A set in the control means 1. Control means 1 such as a CAD / CAM, a processing means 3 using a machine tool such as an NC processing machine or a milling machine, a rotary encoder 5 mounted on an upper position of the processing means 3 so as to face a table 4, and a rotary encoder. Gripping means 6 such as a chuck which is vertically installed with the center axis O coincident with the encoder 5
And a processing tool 7 such as a milling blade held by the holding means 6
A finishing apparatus 10 having a displacement sensor 8 such as a probe and a measuring means 9 disposed on the table 4 is used.

The control means 1 is mechanically or electrically connected to a rotary encoder 5, a gripping means 6, a displacement sensor 8, and a measurement means 9, and outputs measurement data to the control means 1 or outputs from the control means 1. It is designed to operate independently in response to the command. Further, the data of the work forming surface A set in the control means 1 is obtained by setting the entire circumference around the central axis O of the gripping means 6 to a small predetermined angle of, for example, about 1/1000 degrees.
(Not shown), and the distance AL from the center axis O of the gripping means 6 to the workpiece forming surface A is input for each predetermined angle Θ. Incidentally, when the work forming surface A has a shape other than a perfect circle such as a chrysanthemum shape or an elliptical shape, the distance AL differs for each predetermined angle, and when the work forming surface A is a perfect circle, the distance AL differs for each predetermined angle. Are all the same length.

The molding die 2 is fixed to the table 4 of the processing means 3 by using a jig (not shown). This fixed state is maintained until the work forming surface A is finished to a predetermined shape on the outer peripheral surface of the molding die 2. Is done. In finishing the work forming surface A on the outer peripheral surface of the molding die 2, the above-described primary working surface C is left with a shaving allowance B having an arbitrary thickness on the work forming surface A. The surface C may be processed in advance before being fixed to the table 4, or may be processed using the processing tool 7 after fixing the molding die 2 whose outer peripheral surface is rough finished to the table 4. it can. It should be noted that the primary processing surface C in each drawing is exaggerated to show the unevenness in order to facilitate understanding of the description.

The rotary encoder 5 is combined with a displacement sensor 8 which holds the attachment 11 on the holding means 6, and turns the displacement sensor 8 around the center axis O of the holding means 6, so that the workpiece forming surface A and the primary processing are performed. While the surface C is traced by the displacement sensor 8, the workpiece forming surface A and the primary processing surface C are measured at the above-described predetermined angle で by the rotary encoder 5, and the primary processing surface C processed on the outer peripheral surface of the molding die 2 is measured. Is measured at every predetermined angle で by the rotary encoder 5 and the displacement sensor 8 and output to the control means 1 described above.

A chuck or a rotary type automatic blade changing device is used as the gripping means 6. When the gripping means 6 is a chuck, the attachment 1 between the processing tool 7 and the displacement sensor 8 is used.
1 is selectively attached to the central axis O of the gripping means 6, and only one of the processing tool 7 and the displacement sensor 8 is turned around the central axis O of the gripping means 6, and the gripping means 6 is a rotary type. In the case of the automatic blade changing device, the attachments 11 of both the processing tool 7 and the displacement sensor 8 are attached to the gripping means 6, and by rotating the gripping means 6, one of the attachments 11 is positioned at the center of the gripping means 6. The processing tool 7 or the displacement sensor 8 is turned around the central axis O while being positioned on the axis O.

As the measuring means 9, there is used a laser size measuring device in which a pair of light emitting portions 9A and 9A for emitting the laser beam 12 and a pair of light receiving portions 9B and 9B for receiving the laser beam 12 are arranged in a substantially rectangular shape. After processing the primary processing surface C on the outer peripheral surface of the molding die 2 fixed to the table 4 of the processing means 3, the measuring means 9 so that the laser beam 12 is not obstructed by the molding die 2.
Is disposed above the molding die 2, and is mounted on the table 4 using an appropriate jig while aligning the central portions of the light emitting portions 9 A, 9 A and the light receiving portions 9 B, 9 B with the center axis O of the gripping means 6. You.

The measuring means 9 measures data for guiding a reference circle D having a diameter close to the primary processing surface C of the molding die 2 by using the displacement sensor 8 attached to the gripping means 6.
In measuring the data of the reference circle D, the light receiving section 9 of the measuring means 9
The distance a between the inner ends of B and 9B and the distance b from the inner end of the light receiving section 9B to the inner edge of the laser beam 12 are input to the control means 1 in advance. Then, after the displacement sensor 8 is applied to an arbitrary point P1 on the primary processing surface C, the displacement sensor 8 is translated upward as it is, and the displacement sensor 8 is
The displacement sensor 8 is positioned on the same plane as the laser beams 12, 12, and the center axis O of the gripping means 6 in the laser beams 12, 12.
And the displacement sensor 8 and the laser beams 12, 12 are perpendicular to the outer contact points P 2,
The distances c and d to P3 are measured and output to the control means 1.

Next, a method of finishing the work forming surface A on the molding die 2 using the finishing apparatus 10 having the above-described structure will be described with reference to the flowchart of FIG. This will be described with reference to FIG. In this case, a perfect circle work forming surface A is finished on the outer peripheral surface of the mold 2.

First, in step S1, the control means 1
A design distance AL from the center axis O of the gripping means 6 to the workpiece forming surface A is input in advance for each predetermined angle Θ. In the processing of the primary processing surface of step S2, the primary processing surface C is processed on the mold 2 (FIG. 2). This processing is performed either before or after the mold 2 is fixed to the table 4 of the processing means 3. Next, the measurement of the primary processing surface is started in step S3, and the displacement sensor 8 is turned around the central axis O of the gripping means 6 and traces the primary processing surface C with the displacement sensor 8, whereby the displacement sensor 8 and the rotary sensor are rotated. The primary processing surface C is measured by the encoder 5 at every predetermined angle Θ, and the measured dimension is output to the control means 1 (FIG. 3).

In step S4, the measuring means 9 is arranged on the table 4 of the processing means 3, and the displacement sensor 8 is moved to the primary processing surface C.
After that, the displacement sensor 8 is moved in parallel upward as it is, and the displacement sensor 8 is positioned on the same plane as the laser beams 12 and 12 of the measuring means 9. , 12 around the central axis O of the gripping means 6 and tracing the primary processing surface C with the displacement sensor 8, the displacement sensor 8 and the rotary encoder 5 move the primary processing surface C at a predetermined angle Θ. It measures and outputs this measured dimension to the control means 1 (FIGS. 4 and 6). The distance a between the inner ends of the light receiving sections 9B, 9B, which is fixed data of the measuring means 9,
The distance b from the inner end of the light receiving section 9B to the inner edge of the laser beam 12 is input to the control means 1 separately after the measuring means 9 is installed on the table 4 of the processing means 3.

Next, in step S5, the control means 1 uses the distances c and d sent from the measuring means 9 and the previously input distances a and b between the inner ends to obtain a + 2.
The displacement sensor 8 derives a reference circle D drawn by the measuring means 9 from b + c + d =, and further from the reference circle D / 2, an arbitrary point P1 about the center axis O of the gripping means 6 and the primary processing surface C.
Is calculated (FIG. 8).

Then, the control means 1 calculates a displacement amount Δ between the reference radius R and the shape and dimension of the primary processing surface C for each predetermined angle Θ, and calculates the gripping means from the sum or difference between the displacement amount Δ and the reference radius R. The distance CL from the central axis O of 6 to the primary processing surface C is calculated for each predetermined angle Θ. In addition, any one point P of the primary processing surface C
On 1, distance CL = reference radius R (FIG. 8).

Next, based on the difference between the distance CL of the primary processing surface C and the distance AL of the work forming surface A for each predetermined angle を, the cutting allowance B from the primary processing surface C to the work forming surface A is determined for each predetermined angle Θ. Further, the farthest point P4 of the primary processing surface C having the longest distance from the central axis O of the gripping means 6 to the workpiece forming surface A is determined. The farthest point P4 is a point where the cutting allowance B up to the workpiece forming surface A is the largest in the primary processing surface C at every predetermined angle Θ, and the processing tool 7 sets the farthest point P4 to the primary processing surface C.
Is a processing start point at the time of starting the processing (FIG. 8).

In step S6, a processing program suitable for finishing the primary processing surface C to the workpiece forming surface A is set in the control means 1 from the measured or calculated data. This processing program includes the farthest point P4, the feed speed of the processing tool 7, the feed amount inward in the radial direction, and the like.

In step S7, the control means 1 outputs a command based on the processing program to the processing means 3, and positions the processing tool 7 at the farthest point P4, which is a processing start point, to start processing the primary processing surface C. I do. The processing tool 7 draws a true circular locus E similar to the workpiece forming surface A from the farthest point P4 to the outside of the primary processing surface C. In the first round of the processing tool 7 passing through the farthest point P4, The tool 7 returns to the farthest point P4 with little contact with the primary processing surface C (FIGS. 5 and 8).

Next, the processing tool 7 that has returned to the farthest point P4 is
Based on the machining program, a small amount that does not overload the machining tool 7, for example, every 5/1000 mm, is sent inward in the radial direction, and the machining tool 7 is moved outside the primary machining surface C with a locus smaller than the first round. By turning, the turning similar to the workpiece forming surface A and the feeding inward in the radial direction are repeated, and the primary processing surface C is gradually processed inward (FIGS. 5 and 8).

By this repetition, the contact portion between the processing tool 7 and the primary processing surface C gradually increases, and the contact portion is sequentially ground by the processing tool 7 so that the primary processing surface C becomes the work forming surface A. It is gradually formed. Then, in step S8 of the grinding end step in which the processing tool 7 is stopped by the end of the processing program of the control means 1, a predetermined work forming surface A is finished on the outer peripheral surface of the molding die 2 (FIG. 5, FIG. 5).
(FIG. 8).

In step S9, the work forming surface A finished in steps S7 to S8 is inspected, the displacement sensor 8 is applied to the work forming surface A, and the displacement sensor 8 is moved around the center axis O of the gripping means 6. By turning and tracing the work forming surface A, the finishing dimension of the work forming surface A is output to the control means 1 (FIG. 6).

The control means 1 compares the finished work forming surface A with the set work forming surface A, and if the finished size of the work forming surface A is within the allowable range of the set size,
In step S10, finishing is completed, and if the finished dimension is not within the allowable range of the set dimension, step S10 is executed.
In step 11, the process returns to the grinding step of step S7, and in the steps after step S7, the work forming surface A is reworked until the finished dimension is within the allowable range.

As described above, according to the finishing method of the present embodiment, the work forming surface A having a complicated shape and delicate dimensions can be easily and accurately formed on the mold 2 without relying on the hand of a skilled craftsman. It can be manufactured well, and the cost can be greatly reduced compared to handmade by craftsmen. Furthermore, mass production in a short period is also possible, and in such mass production, the conventional disadvantage that the shape and dimensions of the work formation surface A are slightly different can be solved.

Further, the most distant point P4 of the primary machining surface C is found, and this is set as the machining start point.
Is moved in a shape similar to the workpiece forming surface A and grinding is performed, so that the grinding operation can be performed without overloading the processing tool 7, and the life of the processing tool 7 is shortened by breaking or damaging the processing tool 7. The work forming surface A can be beautifully finished. Further, in the present embodiment, step S
After the grinding end step in step 8, the inspection and rework after step S9 can be used as it is with the finishing apparatus 10 used for finishing the work forming surface A, so that workability and economy are excellent, and A highly reliable and reliable work forming surface A can be easily obtained in a short period of time.

FIG. 9 shows a second embodiment of the present invention. In this embodiment, the work forming surface A is set on the inner peripheral surface of the molding die 2, and the work forming surface A is formed into an elliptical shape. It is different from the above-described first embodiment in that it is formed.
The finishing method of the first method using the finishing device 10
Performed in the same manner as in the embodiment.

In this embodiment, since the primary processing surface C is located inside the workpiece forming surface A, the center axis O
From the center axis O of the gripping means 6 to the workpiece forming surface A
The farthest point P4, which is shorter than the distance AL to the cutting edge B and leaves the maximum cutting allowance B, is closest to the center axis O of the gripping means 6. The processing of the primary processing surface C by the processing tool 7 is the farthest point P
Starting from 4, the processing tool 7 is turned inside the primary processing surface C along an elliptical locus E similar to the workpiece forming surface A, and is turned similar to the workpiece forming surface A and fed radially outward. Is repeated to process the primary processing surface C into the work forming surface A.

The finishing of the work forming surface by the method of the present invention may be any shape as long as it can be formed circumferentially on the outer peripheral surface or the inner peripheral surface of the molding die. Finishing is possible even if it is a curved shape such as a chrysanthemum shape or a star shape, a linear shape of a polygon, or a mixed shape of a curve and a straight line.

[0035]

As described above, according to the first or second aspect of the present invention, the work forming surface having a complicated shape or a delicate size depends on the hand of a skilled craftsman. Therefore, it can be manufactured easily and accurately, and the cost can be greatly reduced as compared with handmade by a craftsman.

Further, mass production in a short period of time is possible,
In the case of such mass production, it is possible to solve the conventional problem that the shape and dimensions of the work forming surface are slightly different. In addition, find the furthest point on the primary processing surface and use this as the processing start point.From this farthest point, move the processing tool to a shape similar to the workpiece forming surface and perform finishing processing. The grinding work can be performed without any trouble, and there is no trouble such as breaking or damaging the processing tool to shorten the life, and the work forming surface can be beautifully finished. Further, according to the second aspect of the present invention, after finishing work on the workpiece forming surface, the finishing inspection and reworking of the workpiece forming surface are performed, the finishing apparatus used for the finishing processing can be used as it is, thereby improving workability and economy. It is possible to easily obtain a highly reliable and highly accurate work forming surface with high accuracy in a short period of time.

[Brief description of the drawings]

FIG. 1 is a flowchart of a processing procedure showing a first embodiment of the present invention.

FIG. 2 is a front view of a processing apparatus showing a first embodiment of the present invention.

FIG. 3 is a front view of a processing apparatus showing a first embodiment of the present invention.

FIG. 4 is a front view of a processing apparatus showing a first embodiment of the present invention.

FIG. 5 is a front view of a processing apparatus showing a first embodiment of the present invention.

FIG. 6 is a front view of a processing apparatus showing a first embodiment of the present invention.

FIG. 7 is a plan view illustrating a measurement state by a measuring unit according to the first embodiment of the present invention.

FIG. 8 is a plan view illustrating dimension setting at the time of processing showing the first embodiment of the present invention.

FIG. 9 is a plan view illustrating dimension setting at the time of machining, showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Control means, such as CAD / CAM etc. 2 ... Molding die 3 ... Processing means by a machine tool such as an NC processing machine or milling machine 4 ... Table of the processing means 2 ... Rotary encoder 6 ... Chuck and rotary type automatic blade tool changing device Gripping means 7 Processing tools such as milling blades 8 Displacement sensors such as probes 9 Measurement means (laser dimension measuring device) 9A Light emitting section 9B Light receiving section 10 Finishing device 11 Attachment 12 Laser light A Work Forming surface B: Cutting allowance C: Primary working surface composed of a work forming surface A and a cutting allowance B of an arbitrary thickness D: Reference circle E: Path drawn by the working tool 7 O: Center of the rotary encoder 5 and the gripping means 6 Axis AL: distance from central axis O of gripping means 6 to workpiece forming surface A CL: distance from central axis O of gripping means 6 to primary processing surface C P1: any point on primary processing surface C 2, P3: outer contact point P4: farthest point on the primary processing surface C R: reference radius a: distance between the inner ends of the light receiving sections 9B, 9B of the measuring means 9 b: inside the laser beam 12 from the inner end of the light receiving section 9B Distances to the edges c, d: The displacement sensor 8 and the laser beam 12 are perpendicular to the inner edge of the laser beam 12 .DELTA .: The displacement between the reference radius R and the shape and dimensions of the primary processing surface C

Claims (2)

[Claims] An outer peripheral surface or an inner peripheral surface of a mold (2) is used as a work forming surface (A), and a processing means (3) such as an NC processing machine.
A primary processing surface (C) machined by leaving a cutting allowance (B) of an arbitrary thickness on the work forming surface (A) using a predetermined work forming surface (A) set in advance by the control means (1). A method for finishing a workpiece forming surface of a molding die to be finished in A), wherein a rotary tool (5) attached to the processing means (3) is provided with a processing tool (7) and a displacement sensor (8). A gripping means (6) that selectively turns around a central axis (O) is connected, and the control means (1) is connected from the central axis (O) of the gripping means (6) to the work forming surface (A). Distance (AL)
Is input at predetermined angles (Θ) around the central axis (O) of the gripping means (6), and the molding die (2) is fixed on the table (4) of the processing means (3); The processing tool (7) is turned around the central axis (O) of the gripping means (6) to form a primary processing surface (C) on the molding die (2), and to displace the displacement sensor (8). By turning around the central axis (O) of the gripping means (6) and tracing the primary processing surface (C) with the displacement sensor (8), the displacement sensor (8) and the rotary encoder (5) The primary processing surface (C) is measured at each of the predetermined angles (Θ), and the measured dimensions of the primary processing surface (C) are output to the control means (1). 4) Measurement means (9)
And displace the displacement sensor (8) with the gripping means (6).
Is turned around the central axis (O) of at least an arbitrary point (P1) of the primary processing surface (C) to derive a reference circle (D) from a locus drawn by the displacement sensor (8). Is measured by the measuring means (9), and the data is output to the control means (1). The control means (1) derives a reference circle (D) from the data and, D), a reference radius (R) of a reference circle (D) about the center axis (O) of the gripping means (6) is derived, and the reference radius (R) and the primary processing surface (C) are derived. ) Is calculated for each of the predetermined angles (、), and the displacement (Δ) and the reference radius (R) are calculated.
The distance (CL) from the central axis (O) of the gripping means (6) to the primary processing surface (C) is calculated for each of the predetermined angles (Θ) from the sum or difference from the primary processing surface (C). From the difference between the distance (CL) of the workpiece forming surface (A) and the distance (AL) of the workpiece forming surface (A) for each predetermined angle (Θ), the primary processing surface (C) having the longest distance to the workpiece forming surface (A) is obtained. The far point (P4) is calculated, and the processing tool (7) gripped by the gripping means (6) is set to the farthest point (P4) with the farthest point (P4) as the processing start point.
And the working tool (7) is moved from the farthest point (P4) to a shape similar to the work forming surface (A), and the primary working surface (C) is finished to the work forming surface (A). Finishing method of the work forming surface of the forming die. 2. After the work forming surface (A) is finished by the work forming surface finishing method of the mold according to claim 1, the displacement sensor (8) is gripped by the gripping means (6).
Of the displacement sensor (8)
By tracing the workpiece forming surface (A), the finishing dimension of the workpiece forming surface (A) is output to the control means (1), and the finishing dimension of the workpiece forming surface (A) is compared with the set dimension. If the finishing dimension of the workpiece forming surface (A) is within the allowable range of the set dimension, the processing is terminated. If the finishing dimension is not within the allowable range of the set dimension, the processing tool (7) is used.
A finishing method for a work forming surface of a mold in which the work forming surface (A) is reworked according to the following.