JPH10103906A - Method and implement for measurement of mold clearance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely and safely measure a mold clearance by using a laminated sheet. SOLUTION: A laminated sheet 14 which is formed by laminating respective soft films 15 so as to be mutually slidable is bonded to, and arranged on, a rigid substrate 13, the laminated sheet 14 is pasted on a cutting-edge side face 10a at a lower molded 10 by using an adhesive which is coated on the rear of the substrate 13, one sheet or a plurality of sheets of the films 15 are slid according to the lowering operation of an upper mold 11, and a clearance amount δ is found on the basis of the total thickness of the remaining laminated sheet 14 and the substrate 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for quantitatively measuring the clearance of a mold for shearing such as punching, punching, cutting, and the like, and a measuring tool used for measuring the clearance.

[0002]

2. Description of the Related Art Conventionally, as a method for quantitatively measuring the clearance of a shearing mold, for example, Japanese Patent Publication No. Sho 58
There is a method described in JP-A-42403. In this method, as shown in FIG. 5, after setting a multilayer film (laminated sheet) 1 formed by laminating films of a predetermined thickness on a lower mold 2, an upper mold (here, a punch) 3 is lowered. The laminated sheet 1 is provisionally pressed, and the clearance amount is determined from the thickness α of the remaining uncut sheet 1a that has entered the gap (die clearance) 4 between the cutting edge side surface of the lower die 2 and the cutting edge side surface of the upper die 3. It was made.

[0003]

However, according to the method for measuring the mold clearance described in the above-mentioned publication, the remaining cutting sheet 1a is stretched or shrunk while the cutting blade side surface of the lower mold 2 and the upper mold 3 are not cut. Since the film enters the gap 4 with the side surface of the cutting blade, the number of remaining films does not always correspond to the clearance amount, and there is a problem that it is difficult to measure the mold clearance accurately. In particular, when applied to a complex-shaped mold in which a convex round portion or a concave round portion is present in plan or cross section, the convex round portion or the concave round portion significantly expands and contracts, and in some cases, , FIG.
As shown in (1), there is also a case where no remaining sheet remains in the gap 4 between the cutting edge side surface of the lower die 2 and the cutting edge side surface of the upper die 3, so that the measurement of the die clearance becomes practically impossible.

Also, for example, in the case of cutting, the free end of the laminated sheet 1 hangs down, and when applied to a mold having a shear angle, the drawing of the film becomes large. In any case, the film is effectively cut. And cannot be applied. Further, for example, as shown in FIG. 6, when the lower mold 2 and the upper mold 3 overlap (minus clearance) by the distance β due to mounting failure (misalignment) or the like, the laminated sheet 1 is Since the upper surface of the lower mold 2 is covered, the overlap cannot be determined from the appearance, and there is a danger that the temporary press will cause the mold to interfere and cause serious damage such as breakage of the mold.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a mold clearance having a wide application range in which the mold clearance can be accurately and safely measured by a laminated sheet. And a measuring tool therefor.

[0006]

In order to achieve the above-mentioned object, a method of the present invention is a method for quantitatively measuring a clearance of a shearing die, wherein a plurality of films are slidably laminated on each other. The laminated sheet formed as described above is stuck on the cutting edge side of the lower mold or the upper mold along the shear direction, and one or more of the films are slid according to the matching, and the clearance amount is determined from the thickness of the remaining laminated sheet. Is obtained.

According to the method for measuring the mold clearance configured as described above, according to the relative movement between the lower mold and the upper mold, a force in the shear direction is applied to the end face of the laminated sheet attached to the side surface of the cutting blade. The film laminated beyond the clearance slides, and the remaining laminated sheet fills the clearance between the lower mold and the upper mold. Therefore, the clearance amount can be obtained from the thickness of the remaining laminated sheet.

[0008] In the method of the present invention, the laminated sheet is
The tip may be arranged so as to protrude in the shearing direction from the end face of the lower or upper cutting edge. In this case, if the lower mold and the upper mold overlap, before the upper and lower dies interfere with each other, the mold collides with the entire end surface of the laminated sheet and the laminated sheet is deformed, and the overlapping sheet is deformed. Easy to check.

[0009] The mold clearance measuring instrument according to the present invention is characterized in that the laminated sheet is joined and arranged on a hard substrate. According to this measuring instrument, the rigid sheet backs up the laminated sheet and contributes to maintaining its posture, which is particularly advantageous when the laminated sheet is projected from the cutting edge end face in the shear direction. The measuring instrument may be configured to color-code each film forming the laminated sheet, whereby the clearance amount can be easily specified from the color exposed on the surface of the remaining laminated sheet.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a mold clearance measuring method according to the present invention. The present embodiment is directed to a press die for cutting a steel plate, and an upper die (upper blade) 11 has a predetermined clearance amount δ as indicated by an arrow A with respect to a lower die (lower blade) 10 having a fixed position. , And cuts a steel plate (not shown) mounted and fixed on the lower mold 11. When measuring the mold clearance, a measuring tool 12 to be described later is attached to the cutting blade side surface 10a of the lower mold 10, and the tip portion is protruded by a predetermined distance L from the cutting blade upper surface (cutting blade end surface) 10b.

As shown in FIG. 2, the measuring tool 12 is a relatively hard substrate 13 having a certain rigidity.
And a laminated sheet 14 arranged on the substrate 13. The laminated sheet 14 is formed by laminating a plurality of relatively soft films 15, 15... Slidably with each other via a low-adhesive adhesive. The substrate 13 via the adhesive
Is joined to. The substrate 13 and each film 15
Here the same thickness (for example, 0.1mm, 0.2mm, 0.3mm
Etc.), and the number of laminated films 15 is set such that the total thickness of the laminated sheet 14 as the measuring tool 12 sufficiently exceeds the designed clearance amount. The width of the measuring tool 12 is appropriately set according to the contour shape of the cutting edge portion to be applied, but when applied to a straight cutting edge portion, about 5 mm is sufficient. The materials of the substrate 13 and the film 15 are arbitrary. As the substrate 13, for example, a thin steel plate such as a carbon steel or a stainless steel, or a thin plate of a non-ferrous metal such as a copper alloy or an aluminum alloy can be used. As the film 15, polyester,
Resin films such as polyamide and polyvinyl chloride can be used.

In measuring the mold clearance, a highly adhesive adhesive is applied to the back surface of the substrate 13 in advance, and the substrate 13 is placed on the cutting edge side surface 10a of the lower die 10 with the upper die 11 raised. The measuring tool 12 is pasted by a predetermined distance L (about several mm) from the upper surface 10b of the cutting blade as described above. Then, when the upper mold 11 is lowered from this state, a force in the shear direction is applied to the end face of the laminated sheet 14,
As shown in FIG. 1, the upper film 15 that is laminated so as to exceed the current clearance amount δ is pushed down. At this time, the entire laminated sheet 14 is backed up by the substrate 13 and maintains its upright posture, so that only the film 15 in contact with the end surface of the upper mold 11 is smoothly pushed down,
The remaining film 15 (laminated sheet 14) fills the clearance between the lower mold 10 and the upper mold 11 together with the substrate 13. Therefore, if the number of films 15 remaining on the substrate 13 is counted after the upper mold 11 is raised, the clearance amount δ can be easily specified from the number.

Here, for example, as shown in FIG.
When the upper mold 11 overlaps with the upper mold 11, the upper mold 11 collides with the entire distal end surface of the measuring tool 12 as the upper mold 11 descends. The protruding portion 12a is deformed. Therefore, this measuring tool 1
By observing the deformed state of No. 2, it can be confirmed that the lower mold 10 and the upper mold 11 are overlapped. At that point, if the lowering of the upper mold 11 is stopped, the lower mold 10 and the upper mold 11 are stopped. Interference can be prevented beforehand.

In the present invention, the measuring instrument may be constituted by the laminated sheet 14 alone without the substrate 13. In this case, it is preferable to apply a highly adhesive adhesive to the back surface of the lowermost film 15 of the laminated sheet 14 and stick it to the cutting edge side surface 10a of the lower mold 10 so as not to protrude from the cutting edge upper surface 10b. desirable. By sticking the laminated sheet 14 in this manner, the entire laminated sheet 14 is backed up by the cutting edge side surface 10a and maintains its posture, and only the film 15 abutting on the upper mold 11 is smoothly pushed down, and Similarly to the embodiment, the clearance amount δ can be obtained from the thickness of the remaining laminated sheet 14. Further, when the laminated sheet 14 is used, the cutting edge of the lower die 10 can be visually recognized from the outside, so that interference between the lower die and the upper die 11 caused by a misalignment (overlap) between them can be prevented. Can be prevented.

Further, in the case of using a measuring tool in which the substrate 13 is omitted as described above, since the whole has a flexible structure and the laminated films 15 can slide with respect to each other, FIG. As shown in FIG. 4, the laminated sheet 14 can be evenly stuck to a cutting edge portion having a complicated shape such as the convex round portion 10A and the concave round portion 10B of the lower die 10, and the applicable range is expanded.

In each of the above-described embodiments, the measuring tool 12 or the laminated sheet 14 is attached to the lower mold 10, but instead, these may be attached to the cutting blade side surface of the upper mold 11. Of course, you can do that. Further, each film 15 constituting the laminated sheet 14 may be color-coded in order from the lower layer to the upper layer. In this case, the color and the thickness of the laminated sheet are associated with each other so that the surface of the remaining laminated sheet 14 The amount of clearance can be immediately specified from the color exposed to the camera.

[0018]

According to the method and the tool for measuring the mold clearance according to the present invention, since the remainder of the laminated sheet reliably fills the clearance between the upper and lower molds, processing such as outer shape punching, hole punching, and cutting is performed. The mold clearance can be measured accurately regardless of the mode. In addition, the laminated sheet does not cover the upper surface of the mold, and the presence or absence of interference between the upper and lower molds can be visually recognized from the outside, so that the safety is improved and its utility value is great.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a process of performing a mold clearance measuring method according to the present invention.

FIG. 2 is a sectional view showing an example of the structure of a measuring instrument used in the present invention.

FIG. 3 is a cross-sectional view showing a state where a mold-matching defect is detected by the method of the present invention.

FIG. 4 is a cross-sectional view of the measuring tool, showing a state of attachment when viewed from a shearing direction.

FIG. 5 is a cross-sectional view showing a conventional mold clearance measuring method.

FIG. 6 is a cross-sectional view showing an example of a failure in applying a conventional measurement method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lower die 10a Cutting blade side surface 10b Cutting blade end surface 11 Upper die 12 Measuring tool 13 Substrate 14 Laminated sheet 15 Film

Claims (4)

[Claims] 1. A method for quantitatively measuring the clearance of a shearing die, comprising: laminating a plurality of films so as to be slidable with each other on a cutting edge of a lower die or an upper die. A method for measuring a mold clearance, characterized in that one or more of the films are slid in accordance with a direction, and a clearance amount is obtained from a thickness of a remaining laminated sheet. 2. The method for measuring a mold clearance according to claim 1, wherein the tip of the laminated sheet is projected in a shear direction from an end face of the lower or upper cutting edge. 3. A tool for measuring a mold clearance, wherein a laminated sheet formed by laminating a plurality of films so as to be slidable with each other is joined and arranged on a hard substrate. 4. The mold clearance measuring instrument according to claim 3, wherein each film of the laminated sheet is color-coded.