KR19980081119A - Processing method of gentle inclined surface and guide mechanism of mold using the processing method - Google Patents

Abstract

The present invention provides a machining method that facilitates programming when flanging a gentle slope for guiding a mold.

In the present invention, the cutting start position data of the plunger type tool, the first machining operation end position data, all machining completed position data, tool diameter data, tool length data, cutting amount data, tool retraction amount data for the inclined surface machining Calculate the tool trajectory and perform machining.

Description

Processing method of gentle slope and guide mechanism of mold using the processing method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically and precisely processing a gentle slope in the vertical direction and a guide mechanism of a mold using the processing method.

In the case of press forming a sheet metal, it is necessary to make the sheet thickness of the sheet metal between the upper mold | type and the lower mold | membrane correctly as a clearance in the state which matched the shape of the upper mold | type and lower mold of a metal mold | die normally. In addition, when the sheet metal is plastically deformed, a phenomenon in which the shape is acutely shaped or the shape portion which is easily constrained when deformed is likely to be wrinkled, easily broken, or surface skewed at the time of pressing.

In order to prevent such a phenomenon, it is necessary to provide a retreating gap or R paste in a range where the shape can be intentionally maintained. The gap between the upper and lower molds of the mold affects the finished state of the product and is a very important factor.

For this purpose, it is important to accurately guide the upper and lower molds in relative movement. As a guide means, the guide structure by a pin and a guide hole, or the guide structure by a flat guide surface is used normally.

Among these, the guide structure by the pin and the guide hole is used for the press processing which is comparatively small and requires no force.

In addition, the guide structure of the planar guide surface is used for the large-sized and hard press work, and most of the press dies have this structure.

As shown in Fig. 9, the planar guide surface is formed integrally with a frame body, ie, a pedestal holder, on which a pedestal, which is a lower mold of the mold, is provided. Or as shown in FIG. 13, it is integrally formed in the metal mold body. Then, the punch, which is the upper mold of the mold, is directly guided or the blank holder is guided.

Mold and frame chain holder holders are generally cast and have large dimensions of 1 to 10 m and many of complex shapes. As shown in Fig. 9, the guide surface formed on the pedestal holder is not only faced outwardly with respect to the entire pedestal holder, but also is often inward, and may be provided in a very narrow portion. Difficult to process The same applies to the case of a mold body. Although processing of these points is normally performed using a machining center, the standard attachment 41 provided in the head of a machining center has interference between a frame body and a mold main body, as shown in FIG. 13, and cannot be processed. a lot of works. Therefore, although the special attachment 42 may be manufactured and used, it is difficult to process all guide surfaces.

Therefore, in the past, an elongated end mill was installed on the spindle of a machining center, but the cutting force was applied over almost the entire length of the edge of the end mill. .

In addition, fluctuation of the blade of the end mill and the undulations of the blade lead were transferred to the machined surface to obtain a perfect plane. Therefore, after processing, the processing surface was corrected and a slide plate was attached again to form a guide sliding surface. In order to achieve accurate dimensional accuracy, the slide plate was finished, and the collapse of the machining surface due to the end milling was corrected to secure a gap with the mold upper sliding surface on the opposite side.

Nevertheless, since the sliding surface of the slide plate was worn while the press work was repeated with thousands or tens of thousands, it was necessary to measure and correct it at regular intervals. In addition, since the frame body is very large and heavy, correction and adjustment required very much effort and effort. Originally, since the slide plate is corrected for finishing, etc., the alignment between the upper mold and the lower mold of the mold due to the correction is difficult to reproduce, and re-correction is required when detaching and reassembling.

In order to alleviate this drawback of machining with an elongated end mill, flanging has recently been performed with a plunger type tool as shown in FIG. However, in this flanging process, as shown in Japanese Patent Laid-Open No. Hei 5-92347, a secondary processing contour (b) having a finishing allowance (t) offset to the final workpiece shape is provided, and this secondary processing contour ( In b), the primary processing contour d is calculated. In addition, the center shape line c obtained by separately offsetting the tool radius from the secondary machining contour b is obtained. Next, each processing point C11, C12, C13 ...... on the center shape line c separated by the tool radius R from each point which divided | divided the said 1st processing contour line d is calculated | required. Flanging is performed on the workpiece at each of these processing points. In this way, it was necessary to perform many calculations for each machining surface and to program them individually.

Flanging is known as a machining method for a guided working surface, but it requires a lot of calculations for each of the working surfaces, and each tool trajectory has to be programmed.

The guide surface structure described in the prior art is simply provided with a slide plate on the guide processing surface, and there is a problem that the processing precision of the processing surface itself is bad and must be corrected. In addition, there is a problem that the slide plate is also worn by use, and must be corrected and replaced.

This invention is made | formed in view of such a problem which the prior art has, and the objective is providing the processing method which facilitates the flanging of the inclined process surface for guidance of a metal mold | die.

Provided is a guide surface structure that improves the machining precision of the guide surface of the mold and facilitates pitch alignment between guide sliding surfaces with the mold counterpart.

1 is a view showing the machining state of the inclined surface by the plunger-type tool, a is a top angle is an obtuse angle, b is a top angle is an acute angle,

2 is a control block diagram for carrying out the machining of the embodiment;

3 is a view showing a first embodiment of the tool trajectory, a is a diagram of the tool trajectory, b is a view showing a machining surface situation of a gentle slope,

4 is a view of Embodiment 2 of a tool trajectory;

5 is a view of Embodiment 3 of a tool trajectory;

6 is a view of Embodiment 4 of a tool trajectory;

7 is a view of a fifth embodiment of a tool trajectory;

8 is a view of a sixth embodiment of a tool trajectory;

9 is a view showing a guide surface of a mold frame body;

10 is a combination state of the upper and lower molds of the mold,

11 is an enlarged cross-sectional view of a guide mechanism;

12 is an enlarged front view of the guide mechanism;

13 is a view showing a machining state of a conventional guide surface,

14 is a view showing a flanging processing state of the vertical plane;

15 is a flowchart showing a processing flowchart of Example 1;

※ Explanation of code for main part of drawing

1: slope

2: plunger type tool

25: slope of the mold body

26: inclined surface of the wafer plate

28: wafer plate

29, 31: Positioning bolt of wafer plate

35: wedge plate

In order to achieve the above object, the gentle slanting method of the present invention uses a plunger-type tool mounted on a main axis of a machine tool capable of X, Y, and Z three-axis control to machine a slanted surface that is gently inclined with respect to the tool axis. In this method, the plunger-type tool is moved along a line intersecting a plane parallel to the gentle inclined plane and a plane parallel to the Z axis at a right angle to the gentle inclined plane.

In addition, a plunger-type tool mounted on the main axis of a machine tool capable of X, Y, and Z three axes can be used to process a slanted surface that is inclined gently with respect to the tool axis. The tool is moved to the end position of the machining operation by moving the plunger-type tool along the line where the plane parallel to the gentle inclined plane and the plane parallel to the Z axis is perpendicular to the gentle inclined plane with the starting point as the starting point. A first stroke for cutting (+ Z axis direction), and a second stroke for retracting the tool from the retracted workpiece (-Y axis direction) so as to be substantially perpendicular to the cutting movement advancing direction of the tool at the end of the machining operation at the bottom of the workpiece; A third stroke which raises the tool (-Z axis direction) from the machining operation end position to the height of the machining operation start point vertically on the workpiece, and then And a fourth stroke for moving the cutting amount from the start point of the machining operation to the point of retraction (+ X axis direction), and a fifth stroke for approaching the workpiece to the next machining operation start point (+ Y axis direction). This cycle is repeated in succession from the starting point to the end point (in the direction of + X axis) to determine the tool trajectory of the entire surface to be processed.

The guide mechanism of the metal mold | die of this invention forms the inclined surface for the said guide surface by the flanging process in the metal mold body which has a perpendicular | vertical guide surface of a vertical wall shape, or a frame for metal mold | die installation by flanging, and the inclined surface of the same slope as this inclined surface is one side A wafer plate having the other side perpendicular to the guide surface with the inclined surface comrades on the guide inclined surface in the opposite direction to each other, and then installing a mechanism for finely moving the wafer plate up and down. A supporting shelf is formed at the bottom of the base, and the wedge plate is inserted between the bottom of the wafer plate so that the wedge plate can be adjusted in and out, and the gap between the vertical surface of the back side of the wafer plate and the guide surface of the counterpart mold is moved by vertical movement of the wafer plate. It is to be able to adjust it.

EMBODIMENT OF THE INVENTION Below, embodiment of this invention is described based on drawing.

Simultaneous 2 in the horizontal (X-axis) and vertical (Z-axis) directions on the head of the spindle as shown in FIGS. 1A and 1B while the plunger-type tool 2 is mounted on the end of the vertical spindle of the machining center, not shown. The inclined surface (slow inclination) 1 is processed while making axis control. Each blade of the plunger-type tool 2 uses R-shaped or sharp edges to allow gentle beveling of the tip so that only the blade tip contacts the workpiece.

The control diagram of the tool trajectory at this time will be described based on FIG. 2.

The NC program recognition circuit 3 includes the input position data XA, YA, ZA of the first machining start point, the position data XA, YA, ZB of the first machining operation end, and the position data XB of all machining end points. , YB, ZB), cutting amount data (PPT), tool retraction amount (PGP), tool diameter data (PD), tool length data (PL), spindle speed (PS), spindle speed (PF) ), Read the guitar.

The machining plane defining circuit 4 receives the position data of the first machining start point, the position data of the first machining operation end, and the position data of all machining end points from the NC program recognition circuit 3 to determine the machining slope.

The workpiece length A calculation circuit 5 receives position data in the X-axis direction from the workpiece plane defining circuit 4 and calculates the length A of the workpiece in the X-axis direction.

The cutting count setting circuit 6 receives the cutting amount data PPT from the NC program recognition circuit 3 and receives the workpiece length dimension data A from the workpiece length A calculation circuit 5 and actually performs the cutting count. Calculate A ÷ PPT

The tool diameter and tool length data storage circuit 7 receives and stores the data of the tool diameter and the tool length from the NC program recognition circuit 3. The tool offset calculation circuit 8 receives the data of the machining inclined plane from the machining plane defining circuit 4 and receives the tool data from the tool diameter / tool length data storage circuit 7 to calculate the offset amount (tool radius) of the tool. do.

The retraction amount calculation circuit 9 at the time of cutting receives the data of the machining inclined surface from the machining surface defining circuit 4, and receives the offset amount from the tool offset calculation circuit 8 to calculate the retraction amount of the tool.

The tool trajectory setting circuit 10 receives the position data of the first machining start point, the position data of the first machining operation end, and the position data of all the machining end points from the NC program recognition circuit 3, and the tool offset calculation circuit 8 Receives the tool offset amount data from the tool, receives the tool retracted amount data from the retraction amount calculation circuit 9, and receives the data of the number of cuts from the cutting number setting circuit 6 and offsets the Y-axis direction by the radius of the tool. A program of movement from one first machining operation start point is set.

The program analysis circuit 11 receives the output from the tool trajectory setting circuit 10 and analyzes the machining program for each machining operation. The NC program control circuit 12 receives the output from the program analysis circuit 11 and commands a machining program for each machining operation.

The main designation circuit 13 receives the output of the NC program control circuit 12 and instructs the machine to perform a machining cycle.

The program command is input information data used to automatically set a program for calculating a tool's movement trajectory, and includes cutting tool approach position data R1 in the Z-axis direction of the tool, position data of the initial machining start point of the tool, and initial machining operation. Bottom end position data of the tool, bottom end position data of the final machining operation, the retraction amount data (PGP) in the machining surface of the tool, the movement cutting amount data (PPT) in the transverse direction of the tool, the spindle speed data (PS), the tool Cutting speed data (PF), tool length compensation number (value) data (PH), tool diameter compensation number (value) data (PD), and tool offset position in the Z-axis direction Data indicating whether a page exists (PL1 or PL2). Using the above data, it calculates automatically and sets the programming of tool trajectory.

Prior to the description, coordinates representing the moving direction of the tool are defined. The first cutting start position where the tool is offset is described as the machining origin (X1, Y1, Z1). From the origin, the tool is descending in the + Z axis direction, the ascending direction in the -Z axis direction, and the tool is moved to the workpiece. The approaching direction is the + Y axis direction, the away direction is the -Y axis direction, the direction in which the tool cuts and moves to the right in the drawing is the + X axis direction, and the opposite is the -X axis direction. In addition, the machine origin considers X0, Y0, Z0.

(Example 1)

Tool trajectory is demonstrated based on FIG. 3A and FIG. 3B in which each part of the upper end of a workpiece processing part shows an acute inclination inclination.

The tool is cut in the combined movement of Y-axis (+ direction) and Z-axis (+ direction) at the first machining operation start position A1 (X1, Y1, Z1) while cutting the first machining operation end position ( A2) Move position is determined with (X1, Y2, Z2). The tool then moves to the Y-axis retraction position A3 (X1, Y3, Z2) away from the workpiece to avoid interference with the workpiece when the tool is raised. The tool is then positioned to the cutting amount moving position A4 (X2, Y3, Z2) which transversely moves in the X axis (+ direction) for the next start of the second machining operation. Subsequently, the tool is raised in the Z axis (-direction) for the second machining operation so as to be the height A5 (X2, Y3, Z1) at the start position of the first machining operation. Next, one cycle of the tool moving to the Y-axis (+ direction) second operation start position A6 (X2, Y1, Z1) approaching the workpiece for cutting is completed. In this way, the machining cycle is sequentially executed in the second machining operation and the third machining operation to move the tool in the X axis, and after completion of the final machining operation, the tool is raised from the retracted positions (Xn, Y2, Z2) to the Z axis (-direction). And the tool up end position is reached to end the machining cycle. In this way, gentle slanting is performed.

In addition, a processing cycle including a preparation operation is shown in FIG. 15 as a flowchart.

(Example 2)

The tool trajectory is demonstrated in FIG. 4 in which each part of the lower end of a workpiece | work part shows the gentle inclination of an acute angle.

The first machining operation end position A8 (X1) by combining the tool in the + Z axis direction and the -Y axis direction in the XZ plane at the first machining operation start position A7 (X1, Y1, Z1) of the tool. To Y2, Z2). The tool is then moved to the retraction amount position A9 (X1, Y3, Z2) in the -Y axis direction away from the workpiece. The tool is then moved in the + X axis direction to the transverse position A10 (X2, Y3, Z2) by the cutting amount. Subsequently, the tool is vertically raised in the horizontal position A10 to the height position A11 (X2, Y3, Z1) at the start position of the first machining operation of the tool upwardly in the -Z axis direction. Again, the tool is approached from the position A11 to the workpiece in the + Y axis direction from the second machining operation start position A12 (X2, Y1, Z1). As a result, one cycle of the tool is completed, and then the tool is moved in the X-axis direction (+ direction) in order to process a gentle slope.

(Example 3)

Tool trajectory is demonstrated based on FIG. 5 in which each part of the upper end of a workpiece processing part shows the gentle inclination of an acute angle.

The tool is lowered by the combined movement of the 2-axis control in the Z-axis direction (+ direction) from the first downward machining operation start position A13 (X1, Y1, Z1) to finish the first downward machining operation end position A14. Move to (X1, Y2, Z2). Next, the cutting amount (or 1/2 of the set cutting amount) set in the X-axis direction (+ direction) is moved from the first downward machining operation end position A14 to position at A15 (X1 ', Y2, Z2). . Subsequently, as a result of the combined movement of the 2-axis control of the Z-axis (-direction) and the Y-axis (-direction), the motor moves upward in the -Z-axis direction to position at the end position A16 (X1, Y1, Z1) of the first upward direction machining operation. do. Next, a machining cycle is performed in which the cutting amount or 1/2 of the set cutting amount is moved in the X-axis direction (+ direction) and positioned at the second downward machining operation starting position A17 (X3, Y1, Z1). This machining cycle is then performed in the X-axis direction in turn. In this case, the cutting traces can be made finer by reciprocating cutting in which the machining is performed even in the increase / decrease in the -Z axis direction, and the machining surface accuracy is further improved. In addition, making a cutting amount 1/2 is corresponded when the cutting amount is made small.

(Example 4)

Tool trajectory is demonstrated based on FIG. 6 in which each part of the lower end of a workpiece processing part shows the gentle inclination of an acute angle.

The downward movement of the first downward direction is performed by descending by the combined movement of the 2-axis control in the Z-axis direction (+ direction) and Y-axis direction (-direction) from the first downward machining start position A18 (X1, Y1, Z1). Move to the end position A19 (X1, Y2, Z2). At this position A19, the cutting amount (or 1/2 of the set cutting amount) set in the X-axis direction (+ direction) is moved to position at A20 (X2, Y2, Z2). Then, in the combined movement of the 2-axis control in the Z-axis direction (-direction) and Y-axis direction (+ direction), the -Z axis direction rises to the first upward direction machining operation end position A21 (X2, Y1, Z1). Position it. Subsequently, a machining cycle is performed in which the cutting amount (or 1/2 of the set cutting amount) set in the X-axis direction (+ direction) is moved to position at the second downward machining start position A22 (X3, Y1, Z1). This machining cycle is then performed in the X-axis direction in turn. In this case, the cutting streaks become fine due to the reciprocating cutting.

(Example 5)

Tool trajectory is demonstrated based on FIG. 7 in which each part of the upper end of a workpiece processing part shows the gentle inclination of an acute angle.

The tool 2 is lowered in the + Z-axis direction by the Z-axis control from the first machining operation start position A29 (X1, Y1, Z1) to the first machining operation end position A30 (X1, Y2, Z2). Go to. The tool is then raised to the -Z axis direction and the -Y axis direction positions A31 (X1, Y3, Z1) in the YZ plane without changing the position in the X axis direction. This ascension causes the tool to be retracted from the workpiece in the -Y axis direction by the difference between Y3 and Y1, while simultaneously performing two-axis control to raise the tool in both -Z directions of Z2-Z1. At this time, since the position in the X-axis direction is not changed, the tool moves the YZ plane which has already been processed by the first machining operation away from the workpiece in the -Y-axis direction, Interference of the workpiece does not occur.

Thereafter, at the same time as the movement of the cutting amount in the + X axis direction in the XY plane, the movement of the tool in the + Y axis direction to the workpiece is simultaneously controlled by two axes so that the tool is moved to the second machining operation starting position A32 ( X2, Y1, Z1). In this cycle, gentle slanting is completed by sequentially performing the tool movement in the X-axis direction.

In this method, the simultaneous two-axis control is used twice in addition to the machining, so that the tool is used at the starting position A29 of the first machining operation (A29)-(A30), (A30)-(A31), (A31)-(A32). 3) to move to the second machining operation start position A32, thereby greatly reducing the total time required for machining.

(Example 6)

It demonstrates based on FIG. 8 in which each lower part of a workpiece process part shows the gentle inclination of an acute angle.

The tool is lowered from the first machining operation start position A33 (X1, Y1, Z1) by two-axis control in the + Z-axis direction and the -Y-axis direction, so that the first machining operation end position A34 (X1, Y2, Z2) is reached. The tool is then raised to the position A35 (X1, Y1, Z1) in the -Z axis direction without changing the position in the X axis direction and the Y axis direction. This rise causes the tool to retreat from the workpiece by the difference between Y2 and Y1.

Therefore, the control becomes very simple regarding this rise. Thereafter, the tool is moved in the XY plane at the same time as the movement of the cutting amount in the + X axis direction and the movement of the tool approaching the workpiece in the + Y axis direction is simultaneously controlled in two axes. , Y1, Z1). This tool machining cycle is performed in the X-axis direction in order to complete the gentle inclined machining.

This method allows the tool to be moved in three directions from the first machining operation start position A33 to the second machining operation start position A36 and further reduces the number of simultaneous two-axis control operations, thereby reducing the total time required for machining. At the same time, it is easy to control.

(Example)

The guide surface flanged based on FIG. 10 which is sectional drawing of the metal mold | die of FIG. 10, FIG.

21 is a lower mold of the mold, and 22 is a guide mechanism assembled to the lower mold. Numeral 23 is the upper mold of the mold, guided by the guide mechanism 22 to move up and down, and press processing. 10 and 11, the guide mechanism 22 has the bracket 24 fixed to the upper surface of the lower mold 21 in the state which overhanged the edge part. In the lower part of the bracket 24, the inclined surface 25 for guiding is formed in the lower mold 21 by the flanging process mentioned above with high precision. The wafer plate 28 having the inclined surface 26 having the same inclination as the inclined surface 25 and having the two inclined surfaces 25 and 26 combined in opposite directions with each other in surface contact and having the rear surface 27 as the vertical surface is inclined direction. It is attached to the lower mold 21 by the fixing bolt 33 which is long in the long hole of (up-down direction). This back side 27 acts as a vertical guide surface. The bracket 24 is equipped with two kinds of bolts 29 and 31.

One bolt 29 is screwed onto the bracket so that the end of the bolt 29 comes into contact with the top surface of the wafer plate 28 to act to push the wafer plate 28 down, thereby locking the bolt by the lock nut 30. The position of the (29) is fixed to the bracket 24. The other bolt 31 is screwed to the wafer plate 28 through the screw hole of the bracket 24. The nut 31 is attached to the bolt 31 so as to rotate the nut 32 to lift the wafer plate 28 upward. The action of these two types of bolts 29 and 31 brings the wafer plate 28 to an optimum position.

The wafer plate 28 is fixed to the inclined surface 25 of the lower mold 21 by the fixing bolt 33 at the optimum position. The lower die 21 has a supporting shelf portion 34 formed below the inclined surface 25 so that the wedge plate 35 can be inserted and adjusted between the lower surface of the wafer plate 28 and the supporting shelf portion 34. This prevents the wafer plate 28 from gradually falling down due to vibration or the like during press working.

In this way, the vertical position of the wafer plate 28 is adjusted using the inclined surfaces 25 and 26, so that the horizontal position of the rear surface 27 of the wafer plate 28, which is a vertical guide surface of the lower mold 21 of the mold, is pushed. To adjust.

In addition, although X-axis, Y-axis, and its +-were defined in the said description, this invention is not limited to this, The inclination surface which is not parallel to any axis of X, Y, Z axis is parallel to this inclination surface, The cutting movement direction perpendicular to the cutting movement direction and the direction perpendicular to the cutting movement direction and the tool axis may be used.

In addition, at least two of the fourth strokes may be simultaneously executed in the second stroke, or at least two of the third strokes are simultaneously performed in the third stroke, or the order of the third and fourth strokes may be reversed. The order of each stroke may be arbitrarily changed, such as reversing the order of the second stroke or the fifth stroke.

In addition, the movement in the retraction direction which is substantially perpendicular to the cutting may be omitted, and the machining in the upper direction may be performed by the movement from the lower part of the workpiece to the start point of the machining operation of the workpiece.

Since this invention is comprised as mentioned above, it has the effect described next.

Flanging is adopted in the machining of gentle inclined parts such as mold members, and the machining slope is specified at the starting position, the end position of the machining operation, and the end position of the entire machining, and the tool retraction amount, the cutting amount, the tool diameter, By inputting the tool length, it is possible to automatically perform a gentle inclined machining, so that a command can be made with one program, which simplifies. In addition, since the cutting amount is always constant, a gentle slope with good machining accuracy can be obtained.

In addition, the guide surface of the mold is combined with a gentle inclination of the flanging process and the wafer plate maintains the back side of the wafer plate vertically so that the micro-position can be adjusted in the horizontal direction. It can be performed simply, and high precision guide surface can be realized. Moreover, since the wedge plate is interposed on the bottom surface of the wafer plate, the wafer plate does not slip off due to the vibration in the press working, and the vertical back surface of the wafer plate can always be maintained at a desired position.

Claims (3)

A method in which a plunger-type tool mounted on the main axis of a machine tool capable of X, Y, and Z three-axis control is used to process an inclined surface that is gently inclined with respect to the tool axis. A method of machining a gentle inclined surface, characterized in that the machining is performed by moving a plunger-type tool along a line where planes parallel to the Z axis perpendicular to each other cross. The method of claim 1, A plunger-type tool mounted on the main axis of an X, Y, and Z 3-axis controllable machine tool is used to process a slope that is inclined gently with respect to the tool axis. The tool is cut to the end of the machining operation by moving the plunger-shaped tool along a line where the plane parallel to the gentle inclined plane and the plane parallel to the Z axis at right angles to the gentle inclined plane cross each other. The first step of (+ Z-axis direction) and the second step of retracting the tool from the retraction amount (-Y-axis direction) so as to be substantially perpendicular to the cutting movement advancing direction of the tool at the end of the machining operation of the lower part of the workpiece; And the third step of raising the tool vertically from the machining operation end position to the height of the machining operation starting point of the upper part of the workpiece (-Z axis direction), and A fourth step of moving the tool from the positive start point to the retraction amount (+ X axis direction), and a fifth step of approaching the workpiece to the next machining start point (+ Y axis direction), A method for machining a gentle inclined surface, characterized in that the tool trajectories of the entire machining surface are determined by successively repeating the cycle from the machining start point to the machining end point (in the direction of + X axis). In a mold having a vertical guide surface having a vertical wall shape, an inclined surface for the guide surface is formed on the mold main body or the frame for mounting the mold by flanging, and the other surface is provided with one inclined surface having the same slope as this inclined surface. The wafer plate having the same vertical surface as the guide surface is combined with the inclined surface copper in the opposite direction to the guide inclined surface, and a mechanism for moving the wafer plate up and down again is installed, and a supporting shelf is provided below the guide surface inclined surface. The wedge plate is inserted between the bottom of the wafer plate so as to be adjustable in and out, and the gap between the vertical surface of the back side of the wafer plate and the guide surface of the mating mold is finely adjusted by vertically moving the wafer plate. Guide mechanism of the mold, characterized in that it is possible to.