KR20180017578A - Finishing progressive mold - Google Patents

Abstract

The present invention relates to a finishing consecutive transfer mold. According to the present invention, the finishing consecutive transfer mold comprises: a mold assembly wherein a lower mold (20) and an upper mold (10) are placed to enable internal surfaces thereof to face each other to be close to and spaced from each other; an outer piercing punch (30) placed on the mold assembly to form an outer piercing hole (4) on a material to be processed (2M) fed between the lower mold (20) and the upper mold (10); an outer notching punch (40) placed on the mold assembly to form an outer notching line of a product (2) to be blanked in the material to be processed (2M); an inner piercing punch (50) placed on the mold assembly to form an inner piercing hole (6) on the material to be processed (2M) to be placed on an internal side of the outer piercing hole (4); and an inner notching punch (60) to form an inner notching line on the material to be processed (2M) to be connected to the outer notching line, which is formed on the material to be processed (2M), thereby allowing the product (2) to be blanked on the material to be processed (2M). The present invention is to provide the finishing consecutive transfer mold which is able to improve product quality.

Description

[0001] Finishing progressive mold [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sequential transfer mold for finishing, and more particularly, to a new finishing sequential transfer mold capable of making a blanking product in a workpiece by successively piercing and notching a workpiece while transferring the workpiece .

Precision wafers, gears, plates requiring precision in the inner and outer sides, and the like, which require precision on the fracture surface in the pressing process and which require flatness, have been performed in a fine blanking die at present. For example, a precision washer may be used for a ball bearing of a thrust bearing in order to support a smooth rotation operation of a motor shaft of a motor. Therefore, a precision washer should have smooth inner and outer surfaces, A fine blanking die is often used for precise machining of the inner and outer circumferential surfaces. A fine blanking press equipped with a fine blanking die obtains a clean cross section by applying compressive stress using various types of projections around the blanking. When the fine blanking press is used, the total thickness of the product It is possible to produce precise parts having inner and outer shapes, and such a fine blanking press can be widely used for blanking of the precision washer, precision plate and the like. By using blanking using a fine blanking press, various products can be processed in addition to precision washers and precision plates.

However, since only a part of the thickness between the upper and lower surfaces of the working base material is blanked while most of the remaining thickness is broken in the process of blanking the working base material for making the product to be processed, the blanking surface of the product becomes rough, There is a falling problem. Only about 5 to 10% of the thickness of the upper and lower surfaces of the processed base material is blanked and the remaining thickness is just broken (cracking and breaking phenomenon), so that the blanked surface of the blanked product is not smooth and rough, . In particular, when the blanking surface of a precision product such as a precision washer or a precision plate as described above is not smooth and rough, the quality of the product may deteriorate as well as be defective.

In addition, conventionally, there is no provision of means for sequentially forming a piercing hole and a notching hole (blanking hole) in a workpiece while continuously feeding a workpiece so as to form the product in the workpiece.

Korean Registered Patent No. 10-1483414 (Registered on January 12, 2015) Korean Registered Patent No. 10-1293975 (Registered on August 31, 2013) Domestic registered patent No. 10-1282635 (registered on July 31, 2013) Korean Registered Utility Model No. 20-0401905 (registered on November 16, 2005)

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the problems as described above, and an object of the present invention is to provide a blanking product in a workpiece by sequentially piercing and notching a workpiece while feeding the workpieces continuously, To provide a new finishing sequential transfer mold that can smoothly process the blanking surface of the blank to improve the quality of the product.

According to an aspect of the present invention, there is provided a mold assembly comprising: a lower mold and an upper mold disposed so as to face each other with their inner surfaces facing each other so that the lower mold and the upper mold are spaced apart from each other; An outer piercing punch provided in the mold assembly to form an outer piercing hole in a workpiece to be fed between the lower mold and the upper mold; An outer notching punch provided in the mold assembly to form a contour notching line of the product to be blanked in the work material; An inner piercing punch provided in the mold assembly to form an inner piercing hole disposed inside the outer piercing hole in the workpiece; And an inner notching punch formed on the machining work so as to allow the product to be blanked in the workpiece, wherein the inner notching line and the outer notching line are formed on the machining work.

The present invention relates to a sequential transfer mold for finishing a finished product, comprising: a mold assembly comprising a lower mold and an upper mold, a workpiece being passed therethrough, an outer piercing hole being formed in the workpiece by an outer piercing punch and being blanked in the workpiece by an outer notching punch Forming an inner notching line by an inner piercing punch and forming an inner notching line and an inner notching line formed in the working material on the working material by blanking the inner surface of the working material by an inner notching punch, And has the effect of forming a large number of blanking products by sequentially forming a piercing hole and a notching hole (blanking hole) in the workpiece while continuously feeding (transporting) the workpiece.

In addition, since the blanked surface of the blanked product is smoothly formed without causing a phenomenon (only a breakage of the broken thickness) of only about 5 to 10% of the thickness of the upper and lower surfaces of the processed base material, So that the quality of the apparatus can be improved.

It should be understood that the present invention has various effects other than the above effects, and the above effects are one of the main effects of the present invention.

FIGS. 1 to 3 are side views schematically showing the structure and operating state of the finishing sequential transfer mold according to the present invention
FIG. 4 is a plan view schematically showing the structure of a sequential transfer mold according to the present invention.
Figs. 5 to 9 are partial enlarged plan views of the main portion shown in Fig. 4
10 is a perspective view of a product formed by the sequential transfer mold of the present invention
11 and 12 are cross-sectional views conceptually showing the structure and operating state of the first bending punch
13 and 14 are cross-sectional views conceptually showing the structure and operating state of the second bending punch

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. The same reference numerals are used for the same parts in the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

Referring to the drawings, a finishing sequential transfer mold according to the present invention includes an outer piercing punch 30, an outer notching punch 40, and an inner piercing punch 50 in a mold assembly composed of a lower mold 20 and an upper mold 10, And an inner notching punch 60 are provided. The mold assembly includes a pilot piercing pin 80 and engraved punch 100. The first bending punch 72 and the second bending punch 74 are provided with a position setting pin 90, ).

In the present invention, the upper mold 10 includes an upper holding mold 12 and an upper movable mold 14.

The upper holding mold 12 is formed in a rectangular block shape. In the present invention, the upper holding mold 12 may be configured in a rectangular block shape. The upper holding mold 12 can be fixed to the lifting and moving unit of the press apparatus. At this time, the lifting and moving unit may be constituted by a cylinder, and the upper fixing mold may be connected to the piston rod of the cylinder. As the piston rod of the cylinder is expanded and contracted, the upper holding mold 12 can be raised and lowered.

The upper movable mold 14 may be connected to the upper fixed mold by a predetermined distance from the lower portion of the upper fixed mold by the connecting means. At this time, the connecting means may include a guide bush formed in the upper movable mold 14 and a guide rod provided in the upper holding mold 12 and slidably coupled to the guide bush. The upper movable mold 14 may be attached to a lower portion of the upper holding mold 12 by a fixing means so that the upper movable mold 14 may be maintained at a predetermined distance away from the upper holding mold 12 . The fixing means may include a supporting bolt provided in the upper holding mold 12 and a supporting nut coupled to the supporting bolt in the bottom surface of the upper movable mold 14. [ It is a matter of course that the fixing means may adopt a structure other than the supporting bolt and the supporting nut as long as the means for mounting the upper movable mold 14 in a state of being spaced apart from the lower portion of the upper holding mold 12 by a certain distance.

Also, a spring may be interposed between the upper holding mold 12 and the upper movable mold 14. The spring is compressed when the upper movable mold 14 is pressed toward the upper holding mold 12. When the force for pressing the upper movable mold 14 toward the upper holding mold 12 is released, So that the upper movable mold 14 is retreated from the bottom of the upper holding mold 12 so as to be separated from the bottom.

A lower mold 20 is disposed to face the upper mold 10. A base panel 22 is provided below the upper mold 10 and a plurality of support posts 24 are provided on the base panel 22 and a lower mold 20 is mounted on the support posts 24 So that the inner surface of the upper mold 10 and the inner surface of the lower mold 20 are opposed to each other. A plurality of support posts 24 are provided in the front, rear, left, and right directions of the base panel 22 when viewed from above the base panel 22 and fixed to the bottom surface of the lower mold 20 in the support post 24, 20 are disposed at positions facing the inner surface of the upper mold 10. The inner surface of the upper mold 10 may be referred to as the bottom surface of the upper movable mold 14 and the inner surface of the lower mold 20 may be referred to as the upper surface of the lower mold 20. [

Blanking of the product 2 is performed while a workpiece (metal sheet) is continuously fed between the upper mold 10 and the lower mold 20 of the mold assembly. Accordingly, the present invention can be called a sequential transfer mold for finishing.

At this time, the mold assembly is provided with an outer piercing punch 30 for forming the outer piercing hole 4 in the workpiece 2M to be fed between the lower mold 20 and the upper mold 10. The upper end portion of the outer piercing punch 30 is fixed to the upper holding mold 12 of the upper mold 10 constituting the mold assembly and the outer piercing punch 30 is fixed to the upper piercing punch 30 ) Is inserted into the insert hole. When the upper movable mold 14 is pushed toward the upper holding mold 12, the outer piercing punch 30 protrudes downward from the bottom surface of the upper movable mold 14. [ The outer piercing punch 30 is provided at a position adjacent to the input end of the mold assembly. At this time, the outer piercing punch 30 has a rectangular punch portion in which the left and right end widths in the longitudinal direction of the lower mold 20 are larger than the widths between the outer end and the inner end when viewed from above the lower mold 20 of the mold assembly, And a protruding punch portion provided at an inner end of the rectangular punch portion. The outer piercing punches 30 are disposed at symmetrical positions on the both sides of the longitudinal center line of the mold assembly. As shown in the drawing, a pair of outer piercing punches 30 are arranged above and below the longitudinal center line of the lower mold 20 when viewed from above the lower mold 20, which is a constitution of the mold assembly. The protruding punch portions of the outer piercing punch 30 are arranged to face each other so that the pair of outer piercing punches 30 are arranged at positions symmetrical with respect to the longitudinal center line of the mold assembly. An outer piercing hole 4 is formed in the workpiece 2M of the metal plate material according to the shape of the rectangular punch portion and the projecting punch portion of the outer piercing punch 30. [

The upper holding mold 12, which is a constitution of the upper mold 10, is provided with an outer notching punch 40. At this time, the outer notching punch 40 includes a first outer notching punch 40 and a second outer notching punch 40 which are connected to the first outer notching punch 40 through an outer bridge notching punch 40) portion. Between the inner ends of the first outer notching punches 40 and the inner ends of the second outer notching punches 40, both sides of the outer bridge notching punches extend to the curved portions. The curved surface portion is provided to be symmetrical to both the left and right sides with respect to the center line between both side surfaces of the first outer notching punch (40) portion, the outer bridge notching punch portion, and the second outer notching punch (40) In the present invention, the curved surface portion is formed in a shape of a part of a curved surface of an ellipse, and the pair of curved surfaces are symmetrically disposed on both sides of the center line between the right and left side surfaces of the outer notching punch 40. That is, the outer notching punch 40 includes an outer upper notching punch portion and an outer lower notching punch portion arranged in a direction parallel to the longitudinal direction of the mold assembly when viewed from above the assembly, And an outer bridge notching punch portion connected to the punch portion and having curved portions on both side surfaces intersecting with the longitudinal direction of the mold assembly. The upper notch punch 40 is fixed to the upper holding mold 12 of the upper mold 10 constituting the mold assembly and the outline notching punch 40 is fixed to the upper notch punch 40 40) is inserted into the insert hole. The outer notching punch 40 protrudes downward from the bottom surface of the upper movable mold 14 and the outer notching punch 40 protrudes downward from the bottom of the upper movable mold 14. When the upper movable mold 14 is pushed toward the upper holding mold 12, An outline notching line is formed in the workpiece 2M. As a result, the mold assembly is provided with an outer notching punch 40 and the outer notching punch 40 forms an outer notching line of the product 2 to be blanked in the workpiece 2M.

The mold assembly is provided with an inner piercing punch 50. An inner piercing punch 50 is provided in the upper holding mold 12, which is a constitution of the mold assembly. At this time, the inner piercing punch 50 includes a first inner piercing punch 52 and a second inner piercing punch 54.

The first inner piercing punch 52 is provided in the upper holding mold 12 so as to be disposed between the pair of outer piercing punches 30. The first inner piercing punch 52 is configured in the shape of a square cross-section punch. At this time, the first internal piercing punches 52 are disposed symmetrically with respect to the longitudinal center line of the mold assembly. A pair of first inner piercing punches 52 are disposed above and below the longitudinal centerline of the lower mold 20 when viewed from above the lower mold 20 which is the configuration of the mold assembly. A pair of first inner piercing punches (52) are disposed between the pair of outer piercing punches (30). The upper end of the first inner piercing punch 52 is fixed to the upper holding mold 12 of the upper mold 10 constituting the mold assembly and the first inner piercing punch 52 is fixed to the upper holding mold 12 of the upper mold 10, 1 Inner piercing punch 52 is inserted into the insert hole. When the upper movable mold 14 is pushed toward the upper holding mold 12, the first inner piercing punch 52 protrudes downward from the bottom surface of the upper movable mold 14 so that the pair of first inner piercing punches 52 , Two internal piercing holes 6 are formed in the workpiece 2M. The inner piercing hole 6 is formed as a square hole in the shape of the first inner piercing punch 52. Two inner piercing holes 6 are formed at positions symmetrical up and down with respect to the longitudinal center line of the workpiece 2M.

The present invention has an inner notching punch 60 for forming an outer notching line and a succeeding inner notching line formed in the processing material 2M in the processing material 2M so that the product 2 is blanked in the processing material 2M .

The inner notching punch 60 includes an inner bridge notching punch portion disposed on the longitudinal center line of the mold assembly when viewed from the top of the mold assembly and an inner bridge notching punch portion extending from both ends of the inner bridge notching punch portion, And a pair of inner main notching punch portions arranged in a direction orthogonal to the main inner notching punch portion.

The inner bridge notching punch portion is formed in a straight block shape disposed on the longitudinal center line of the mold assembly when viewed from above the mold assembly.

The pair of the inner main notching punches are formed in a rectangular block shape when viewed from the top of the mold assembly. Each of the inner main notching punches has an inner protruding notching punch portion in the form of a substantially triangular block at the upper and lower ends thereof.

The inner notching punch 60 is fixed to the upper holding mold 12 constituting the mold assembly and is inserted into the insert hole of the inner notching punch 60 formed in the upper movable mold 14. [

The inner notching punch 60 protrudes downward from the bottom surface of the upper movable mold 14 and the inner notching punch 60 protrudes downward from the bottom of the upper movable mold 14 The inner notching line is formed in the workpiece 2M. The inner notching line is formed so as to be connected to the outer notching line so that the product 2 can be blanked by the working material 2M if the inner notching line extending to the outer notching line is formed in the working material 2M.

The outer piercing punch 30 is provided at a position adjacent to the input end of the mold assembly and the outer notching punch 40 is disposed between the first bending punch 72 provided in the mold assembly and the outer piercing punch 30 The inner notching punch 60 is provided at a position adjacent to the discharge end of the mold assembly and between the inner notching punch 60 and the first bending punch 72 is provided a second bending punch 74 between the first bending punch 74 and the inner bending punch 60 and between the first bending punch 74 and the inner notching punch 60 disposed between the first bending punch 72 and the second bending punch 74 And a second escaping sector disposed.

The inner piercing punch 50 may further include a first inner piercing punch 52 disposed between the pair of outer piercing punches 30 and a second inner piercing punch 52 disposed in the first escape sector, The second internal piercing punch 54 being larger than the cross-sectional area of the second internal piercing punch 54. [

The second inner piercing punch 54 has a rectangular punch shape similar to the first inner piercing punch 52, but the cross-sectional area of the second inner piercing punch 54 is larger than the cross-sectional area of the first inner piercing punch 52.

The present invention includes a bending punch (70) provided in a mold assembly. The bending punch 70 includes a first bending punch 72 and a second bending punch 74 for bending a portion of the entire area of the workpiece 2M for forming the product 2 .

The first bending punch 72 is formed by bending a part of a region for forming the product 2 in the workpiece 2M to be transferred from the input end to the discharge end of the mold assembly, Thereby forming a portion 2FB. A first bending punch 72 is provided in the upper holding mold 12, which is a constitution of the mold assembly. Further, the first bending punch 72 is inserted into the insert hole of the first bending punch 72 formed in the upper movable mold 14. At this time, the bottom surface of the first bending punch 72 has a first bending surface inclined upward upward from the upper surface of the lower mold 20, and the lower mold 20 has a top surface portion corresponding to the first bending surface And a first lower bending face upwardly inclined upward from the upper surface of the lower mold 20. The first bending punch 72 protrudes from the bottom surface of the upper movable mold 14 when the upper movable mold 14 is pressed toward the upper holding mold 12 so that the product 2 The first bending part 2FB is formed on a part of the product 2 to be blanked in the workpiece 2M by first bending a part of the area to be formed. The first bending portion 2FB is a portion where a part of the product 2 to be blanked is bent upward.

The second bending punch 74 bends a part of the first bending portion 2FB that is bent upward by the first bending punch 72 in a second order, The second bending punch 74 is provided. A second bending punch 74 is provided in the upper holding mold 12 so as to be disposed between the inner notching punch 60 and the first bending punch 72. The second bending punch 74 is also inserted into the insert hole of the second bending punch 74 formed in the upper movable mold 14. [ At this time, the bottom surface of the second bending punch 74 has a second bending surface inclined downward toward the upper surface of the lower mold 20, and the lower mold 20 is lowered on a part of the upper surface corresponding to the second bending surface. And a second lower bending face inclined downward toward the bottom surface of the mold 20. Preferably, the inclination of the first bending surface and the first lower bending surface and the inclination of the second bending surface and the second lower bending surface is such that the bending of the first bending portion 2FB and the second bending portion 2SB of the product 2 Is greater than the angle of incidence. The first bending punch 72 and the second bending punch 74 protrude from the bottom surface of the upper movable mold 14 when the upper movable mold 14 is pressed toward the upper holding mold 12, A part of the first bending portion 2FB formed on a part of the product 2 is bent by the punch 72 so that the second bending punch 74 is bent secondarily so that the part of the product 2 to be blanked in the processing material 2M 1 bending part of the bending part 2FB downward. This may be referred to as a second bending portion 2SB, wherein the inclination of the first bending surface, the first lower bending surface, the second bending surface and the second lower bending surface is such that the inclination of the first bending portion The first bending portion 2FB and the second bending portion 2SB of the product 2 to be blanked are configured to have a larger inclination angle than the angle at which the second bending portion 2SB is bent at the product 2, The first bending portion 2FB and the second bending portion 2FB are bent by the first bending surface, the first lower bending surface, the second bending surface, and the second lower bending surface by the spring bending phenomenon, Even if the first bending portion 2FB and the second bending portion 2SB return to the original state by a predetermined angle (i.e., the first bending portion 2FB and the second bending portion 2SB are bent) 2FB and the second bending portion 2SB can be maintained.

In the present invention, the outer piercing punch 30, the outer notching punch 40, the inner piercing punch 50, and the inner notching punch 60 are disposed at positions symmetrical with respect to the longitudinal center line of the mold assembly, The outer work piercing hole 4, the outer notching lines, the inner piercing holes 6, and the inner notching lines are symmetrically positioned on both sides of the work material 2M with respect to the longitudinal center line of the work material 2M, As shown in FIG. A first inner piercing hole 6 formed by the first inner piercing punch 52 and a second inner piercing hole 6 formed by the second inner piercing punch 54 are formed on the longitudinal center line of the work material 2M, Are formed at positions symmetrical with respect to each other on both sides.

The first bending punch 72 and the second bending punch 74 are also disposed symmetrically with respect to the longitudinal center line of the mold assembly, so that the product to be blanked A pair of bending portions symmetrical with respect to the longitudinal center line of the workpiece 2M is formed in a part of the region of the workpiece 2M. A pair of first bending portions 2FB symmetrical with respect to the longitudinal center line of the workpiece 2M is formed on the workpiece material 2M by the first bending punch 72 (i.e., the first bending portion 2FB Of the workpiece 2M is formed in a part of the area for blanking the product 2 in the workpiece 2M) and is symmetrical with respect to the longitudinal centerline of the workpiece 2M by the second bending punch 74 The second bending portion 2SB is formed on the working material 2M (that is, the second bending portion 2SB is formed in a part of the area for the product 2 to be blanked in the working material 2M).

The first bending punch 72 and the second bending punch 74 provided in the upper holding mold 12 secure the first bending punch. The upper mold 10 is lowered toward the lower mold 20 so that the upper movable mold 14 is pressed toward the upper holding mold 12 while being in contact with the upper surface of the lower mold 20. However, The first bending punch 72 and the second bending punch 74 are further projected downward from the bottom surface of the upper movable mold 14 when the first bending punch 72 is pushed toward the upper holding mold 12, The first bending punch 74 and the first bending punch 74 are secured. The space between the first bending punch 72 and the second bending punch 74 projecting downward from the bottom surface of the upper movable mold 14 becomes the first escaping sector of the mold assembly.

The second escaping sector is secured between the second bending punch 74 provided in the upper holding mold 12 and the inner notching punch 60. The upper mold 10 is lowered toward the lower mold 20 so that the upper movable mold 14 is pressed toward the upper holding mold 12 in contact with the upper surface of the lower mold 20. However, The second bending punch 74 and the inner notching punch 60 are further projected downward from the bottom surface of the upper movable mold 14 when the movable mold 14 is pressed toward the upper holding mold 12, The second escaping sector is secured between the punch 74 and the inner notching punch 60. [ The space between the second bending punch 74 and the inner notching punch 60 further projecting downward from the bottom surface of the upper movable mold 14 becomes the second escaping sector of the mold assembly.

The mold assembly is provided with a pilot piercing pin 80 to be disposed between the outer piercing punch 30 and the outer notching punch 40. A pilot piercing pin (80) is provided in the upper holding mold (12) constituting the mold assembly. The pilot piercing pin 80 is inserted into the pin hole formed in the upper movable mold 14 so that when the upper movable mold 14 is pressed toward the upper holding mold 12, So that a pilot hole is formed in the workpiece 2M. A pilot piercing pin 80 is provided in the upper holding mold 12 so as to be positioned next to the first inner piercing punch 52 when viewed from above the lower mold 20. When the upper movable mold 14 is pushed toward the upper holding mold 12 and the pilot piercing pin 80 protrudes from the bottom surface of the upper movable mold 14, a pilot hole is formed in the working material 2M. A pilot hole may be formed in the workpiece 2M so as to be disposed beside a pair of first internal piercing holes 6 formed in the workpiece 2M. In the present invention, the piercing hole is formed on the longitudinal center line of the workpiece 2M.

The present invention further includes a position setting pin (90) provided in the mold assembly to be inserted into a pilot hole formed in the workpiece (2M) by a pilot piercing pin (80). The upper end of the position setting pin 90 is connected to the upper holding mold 12. The upper movable mold 14 is provided with a position setting pin 90 and an insertion hole is provided in the position setting pin 90. The pin bushing 94 is slidably provided in the insert hole, A part of the lower side of the pin 90 is slidably inserted. A spring is interposed between the upper end of the pin bushing 94 and the bottom surface of the upper holding mold 12 so that the upper movable mold 14 is opened in the upper holding mold 12, A part of the lower end side portion of the pin bush 94 normally protrudes below the bottom surface of the upper movable mold 14. [ The position setting pin 90 has a tapered fin portion 92 which is gradually reduced in outer diameter toward the upper surface of the lower mold 20. The taper pin portion 92 protrudes from the bottom of the upper movable mold 14 in a state in which the upper movable mold 14 is opened in the upper holding mold 12. [ The taper pin portion 92 of the position setting pin 90 protrudes further from the bottom surface of the upper movable mold 14 than the pin bush 94. [

When the upper mold 10 comes down to the lower mold 20 and the bottom surface of the upper movable mold 14 comes into contact with the upper surface of the work material 2M, the pin bush 94 presses the upper movable mold 14 The position setting pin 90 enters the insert hole and the taper pin portion 92 of the position setting pin 90 is inserted into the pilot hole formed in the workpiece 2M by the pilot piercing pin 80. [

The mold assembly is provided with a product drop sector between the second escape sector and the discharge end, and an inner notching punch (60) is disposed in the product drop sector, wherein the product drop sector is provided with a drop guide member (68).

A drop guide member 68 is provided in the upper holding mold 12 as a constitution of the mold assembly and the upper movable mold 14 is provided with a drop guide hole 68 in the lower guide member 68, 68) a drop guide member 68 is movably coupled to the lower insertion hole of the drop guide member 68 of the insert hole and the upper movable mold 14 and the drop guide member 68 and the drop guide member 68 The lower insert hole is provided with a spring which urges the drop guide member 68 toward the bottom surface of the upper movable mold 14 so that the entire upper mold 10 is separated from the upper surface of the lower mold 20 A part of the lower side of the drop guide member 68 protrudes further downward than the bottom surface of the upper movable mold 14 by the spring. A pair of drop guide members 68 are provided on the upper mold 10 so as to be symmetrical with respect to the longitudinal center line of the mold assembly. A pair of drop guide members 68 are provided on the basis of the longitudinal center line of the upper mold 10 when viewed from above the upper mold 10. A pair of drop guide members 68 are provided on the inner notching punch 60, Respectively. The inner notching punch 60 is disposed on the inner side of the pair of drop guide members 68 when viewed from above the upper mold 10. [

On the other hand, the lower mold 20 is provided with a drop guide member 68 entrance hole, and the drop guide member 68 entrance hole communicates with the upper and lower surfaces of the lower mold 20.

When the entire upper mold 10 descends toward the lower mold 20, the falling guide member 68 first reaches the upper surface of the upper mold 10 while being in contact with the upper surface of the workpiece 2M, The inner notching line is formed in the workpiece 2M by the inner notching punch 60 and the inner notching line is formed by the inner notching punch 60 when the inner notching line is formed in the workpiece 2M, The falling guide member 68 elastically pushes down the blanked product 2 from the workpiece 2M and drops it down. A part of the lower side of the drop guide member 68 enters into the drop guide member 68 entrance hole formed in the lower mold 20 and the product 2 blanked by the work material 2M is guided to the lower side of the lower mold 20 Drop.

Further, a downward inclined scrap discharging guider 28 is provided on the bottom surface of the lower mold 20. The scrap is a metal byproduct produced by notching by the inner notching punch 60 in the work material 2M so that the scrap obtained by the inner notching punch 60 is scraped off from the bottom of the lower mold 20, 28 to the bottom of the lower mold 20.

A lift pin LP is inserted into the insert hole of the lower mold 20 so that the lower end of the lift pin LP and the lift pin (LP) insert hole, and a part of the upper end side of the lift pin (LP) is projected to the upper surface of the lower mold (20) by a spring. The lift pins LP are provided at four places on the upper, lower, left, and right sides when viewed from the upper surface of the lower mold 20. (Fed) from the input end of the mold assembly to the output end with the bottom surface of the workpiece 2M floating slightly above the upper surface of the lower mold 20 by the lift pins LP.

Further, the lower mold (20) is provided with a milling pin (MP) insert hole therein. At least one MP hole is formed to be disposed between a lift pin LP hole of the lower mold 20 and an insert hole of the drop guide member 68. A MP hole is formed in the MP hole, A spring is interposed between the lower end of the MP and the MP hole so that a part of the upper end of the plate is projected to the upper surface of the lower mold 20 by a spring. The microneedle (MP) can also be provided at four locations on the upper, lower, left, and right sides of the lower mold 20. The bottom surface of the workpiece 2M is fed (supplied) from the inlet end of the mold assembly to the outlet end with the bottom surface of the workpiece 2M floating slightly above the upper surface of the lower mold 20 by the MP.

The present invention further includes an engraved punch (100) provided in the mold assembly to be disposed between a pair of first bending punches (72). The engraved punch 100 is provided on its bottom surface with engraved protrusions for engraving the product 2 number (LOT number or the like) into the product 2. The engraved punch 100 is provided in the upper holding mold 12, which is a constitution of the mold assembly. The upper movable mold 14 is provided with an engraved punch 100 insert hole so that the engraved punch 100 is inserted into the insert hole of the engraved punch 100 inside the upper movable mold 14. The upper movable mold 14, The engraved punch 100 protrudes further downward than the bottom surface of the upper movable mold 14 to engage the product 2 on the surface of the product 2 when the punch 100 is pushed toward the upper holding mold 12. [ At this time, the engraved punch 100 is disposed at each symmetrical position with respect to the longitudinal center line of the mold assembly. When viewed from above the upper mold (10), punches (100) are provided one by one on the upper and lower sides with respect to the longitudinal center line of the upper mold (10).

Further, in the present invention, an add hole (8) punch is provided in the mold assembly. An add hole 8 punch is provided in the upper holding mold 12 and an upper hole 8 in the upper movable mold 14 is provided so that the add hole 8 punch is inserted into the upper movable mold 12 (8) punch insert holes in the upper movable mold (14), and when the upper movable mold (14) is pressed toward the upper holding mold (12) So that the adhole 8 is formed in the product 2 to be blanked in the processing material 2M. The punches of the two rows are arranged one by one at symmetrical positions with respect to the longitudinal center line of the mold assembly. Two rows of addhole 8 punches are provided above and below the longitudinal center line of the upper mold 10 when viewed from above the upper mold 10. [ The two rows of addholes 8 are provided on the outside of the pair of second inner piercing punches 54. When viewed from the upper side of the upper mold 10, the two rows of add holes 8 are arranged at symmetrical positions with respect to the longitudinal center line of the upper mold 10, and between the upper and lower punches 8, And a pair of second inner piercing punches 54 are disposed.

In addition, the present invention further includes a feeding guide roll 120 provided at a feeding end of the mold assembly to feed the working material 2M to the discharge end of the mold assembly. A feeding guide roll 120 is provided at a feeding end of the lower mold 20 which is a constitution of the mold assembly (toward the inlet side of the workpiece 2M). At this time, the feeding guide roll 120 is provided so as to be symmetrical up and down with respect to the longitudinal center line of the mold assembly. A feeding guide roll 120 is provided on the upper and lower sides of the upper mold 10 with respect to the longitudinal center line of the upper mold 10 when viewed from above. At this time, the upper and lower feeding guide rolls 120 are provided in at least two or more rows. The feeding guide roll 120 rotates in contact with both side surfaces of the working material 2M (both side surfaces with respect to the longitudinal center line of the working material 2M) so that the working material 2M is fed to the feeding end (Supplied) to the discharge end sequentially.

According to the finishing successive transfer tool of the present invention having the above-described structure, the workpiece 2M is sequentially supplied by the feeding guide roll 120, and the workpiece 2M is blanked by the workpiece 2M, The process of forming the product 2 by blanking the processed material 2M will be described below. The area where the outer piercing punch 30, the first inner piercing punch 52, and the pilot piercing pin 80 are provided is referred to as a first sector, a front and rear area The area where the first bending punch 72 and the engraving punch 100 exist is referred to as a fourth sector, the area where the addholt 8 punch and the second inner piercing punch 54 are located, The area between the inner notching punch 60 and the second bending punch 74 is referred to as a seventh sector and the inner notching punch 60 The area where the drop guide member 68 is located will be described as the eighth sector.

1. Formation of outer piercing hole, inner piercing hole and pilot hole

The upper mold 10 is lowered under the lower mold 20 in a state in which the work material 2M is lifted slightly upward from the upper surface of the lower mold 20 by the lift pins LP provided on the lower mold 20, The upper movable mold 14 is pushed toward the upper holding mold 12 when the lower mold of the upper movable mold 14 is in contact with the upper surface of the work material 2M and the upper mold 10 is subsequently lowered, A pair of symmetrical outer piercing holes 4 are formed in the workpiece material 2M by the outer piercing punch 30 and the first inner piercing punch 52 and the pilot piercing pin 80 fixed to the workpiece 12, A piercing hole 6 and a pilot hole are formed. The outer piercing hole 4, the inner piercing hole 6 and the pilot hole are formed in the first sector of the mold assembly.

2. Formation of Outline Notching Line

The entire upper mold 10 is lifted up from the lower mold 20 and then the workpiece 2M is transferred to the second sector of the mold assembly by the feeding guide roll 120. [ At this time, the machining material 2M is transferred to the second sector of the mold assembly by the feeding guide roll 120 while the machining material 2M is raised above the upper surface of the lower mold 20 . The upper mold 10 is lowered to the lower mold 20 in a state where the processing material 2M having the outer piercing hole 4, the inner piercing hole 6 and the pilot hole is transferred to the second sector of the mold assembly When the upper movable mold 14 is pushed toward the upper holding mold 12 as described above, a half notch notching line is formed in the work material 2M by the outer notching punch 40 provided in the upper holding mold 12 do. The outline notching line is a generally elliptical cutting line, once formed in the second sector of the mold assembly, by a notch-notching punch to form a semi-elliptical half-notch notched line. In the figure, the semi-elliptical line indicated by a solid line is a half-elliptical outline notching line.

Next, the upper mold 10 is lifted above the lower mold 20, and the workpiece 2M is lifted up slightly from the lower mold 20 by the milling force MP, The machining material 2M is transported to the third sector of the work 2M. The workpiece 2M having the outer piercing hole 4, the inner piercing hole 6, the pilot hole, and the half-circumference notching line is transferred to the third sector of the mold assembly. When the upper mold 10 is lowered by the lower mold 20 and the upper movable mold 14 is pushed toward the upper holding mold 12 as described above, (Not shown) to form a remaining half-circle notching line in the workpiece 2M. The outline notching line is a generally elliptical cutting line that forms a half outline notching line in the workpiece 2M in the second sector and a remaining half outline notching line in the third sector of the mold assembly. When the workpiece 2M is in the second sector of the mold assembly when seen from the top of the mold assembly, a half-rounded notched line is formed by the right curved portion of the outer notch punch 40, While the remaining half-half notch notching lines are formed by the left curved portion of the outline notching punch 40 in the third sector. In the drawing, an elliptical line indicated by a solid line is an elliptical outline notching line.

On the other hand, when forming the substantially elliptical outline notching lines by forming the half-circumference notch notching lines in each of the second sector and the third sector, the position setting pin 90 is inserted into the pilot hole formed in the workpiece 2M, Since the position of the material 2M is precisely held, the outer notching line is accurately formed on the workpiece 2M. At this time, since the taper pin portion 92 of the position setting pin 90 is inserted into the pilot hole of the workpiece 2M more smoothly at the tip of the position setting pin 90, There is a more smooth and precise effect in positioning the material 2M.

3. First bending part and stamping number formation

The entire upper mold 10 is lifted up from the lower mold 20 and then the work material 2M is transferred to the fourth sector of the mold assembly by the feeding guide roll 120. [ At this time, the machining material 2M is transferred to the fourth sector of the mold assembly by the feeding guide roll 120 while the milling MP is lifted up from the upper surface of the lower mold 20 . The upper mold 10 is moved to the lower mold 20 in a state where the processing material 2M having the outer piercing hole 4, the inner piercing hole 6, the pilot hole and the outer notching line is transferred to the fourth sector of the mold assembly. And the upper movable mold 14 is pressed toward the upper holding mold 12 as described above so that the first bending punch 72 provided in the upper holding mold 12 can lower the product (2) bends the portion to be blanked down primarily. Then, the first bending portion 2FB is formed on a part of the product 2 to be blanked in the workpiece 2M. At the same time, the engraved punch 100 provided in the upper holding mold 12 carries engraved numbers on areas to be blanked in the workpiece 2M. Of course, even when the engraved number is formed with the first bending portion 2FB in the fourth sector, the position setting pin 90 is inserted into the pilot hole formed in the machining material 2M to accurately position the machining material 2M So that the first bending part 2FB and the engraved number are accurately formed on the workpiece 2M.

4. Internal Piercing Hole and Adhole Formation

The upper mold 10 is lifted up from the lower mold 20 and then the work material 2M is transferred to the fifth sector of the mold assembly by the feeding guide roll 120. [ At this time, the fifth sector of the mold assembly is the first escaping sector. Even when the workpiece 2M is transported to the fifth sector, the workpiece 2M is moved by the feeding guide roll 120 in a state in which the workpiece 2M is raised above the upper surface of the lower mold 20, ) To the fifth sector of the mold assembly. The upper mold 10 is moved in the state where the workpiece 2M having the outer piercing hole 4, the inner piercing hole 6, the pilot hole and the first bending portion 2FB is transferred to the fifth sector of the mold assembly, When the upper movable mold 14 is pushed toward the upper holding mold 12 as described above by lowering the lower mold 20 by the second inner piercing punch 54 provided in the upper holding mold 12, Thereby forming an inner piercing hole 6 in the inner wall 2M. At this time, since the cross-sectional area of the second inner piercing punch 54 is larger than the cross-sectional area of the first first inner piercing punch 52, the second inner piercing hole 6 is larger than the first inner piercing hole 6 . The second inner piercing hole 6 is the complete inner piercing hole 6 of the product 2 blanked in the workpiece 2M. At the same time, the addhole 8 is formed in the product 2 to be blanked by the addhole 8 punches provided in the fifth sector of the mold assembly. Even when the second inner piercing hole 6 and the add hole 8 are formed in the fifth sector, the position setting pin 90 is inserted into the pilot hole formed in the working material 2M, The second inner piercing hole 6 and the addhole 8 are precisely formed on the workpiece 2M.

5. Formation of second bending part

The processing material 2M in which the outer piercing hole 4, the inner piercing hole 6, the pilot hole, the first bending portion 2FB and the add hole 8 are formed is transferred to the sixth sector of the mold assembly. Even when the workpiece 2M is fed to the sixth sector, the milling MP is moved by the feeding guide roll 120 in a state where the workpiece 2M is lifted up from the upper surface of the lower mold 20, ) To the sixth sector of the mold assembly. If the upper mold 10 is lowered to the lower mold 20 and the upper movable mold 14 is pressed toward the upper holding mold 12 as described above, A part of the first bending portion 2FB of the workpiece 2M is bent downward by the punch 74 to form the second bending portion 2SB. Even when the second bending portion 2SB is formed in the sixth sector of the mold assembly, the position setting pin 90 is inserted into the pilot hole formed in the workpiece 2M to accurately position the workpiece 2M, The second bending portion 2SB is accurately formed on the workpiece 2M.

6. Feed the workpiece to the seventh sector of the mold assembly

The seventh sector of the mold assembly is the above-described second escaping sector. The processing material 2M in which the outer piercing hole 4, the inner piercing hole 6, the pilot hole, the first bending portion 2FB, the add hole 8 and the second bending portion 2SB are formed, Even if the upper mold 10 is lowered to the lower mold 20 and the upper movable mold 14 is pushed toward the upper holding mold 12 as described above after the transfer to the seventh sector, , No processing is performed on the workpiece 2M in the seventh sector.

7. Formation of blanking products by internal notching lines

The upper mold 10 is lifted up from the lower mold 20 and then the work material 2M is transferred to the eighth sector of the mold assembly by the feeding guide roll 120. [ Even when the workpiece 2M is transferred to the eighth sector, the workpiece 2M is moved by the feeding guide roll 120 in a state in which the workpiece 2M is lifted up from the upper surface of the lower mold 20, ) To the eighth sector of the mold assembly. The processing material 2M in which the outer piercing hole 4, the inner piercing hole 6, the pilot hole, the first bending portion 2FB, the add hole 8 and the second bending portion 2SB are formed, When the upper mold 10 is lowered to the lower mold 20 while the upper mold 10 is moved to the eighth sector after passing through the seventh sector and the upper movable mold 14 is pushed toward the upper holding mold 12 as described above, The inner notching punch 60 provided in the mold 12 forms an inner notching line in the workpiece 2M. The inner notching line is a cutting line following the outer notching line, and this inner notching line is formed in the working material 2M to produce the blanked product 2 in the working material 2M. Simultaneously, the product 2 is pushed downward from the workpiece 2M by the drop guide member 68 provided in the eighth sector of the mold assembly (more precisely, in the upper holding mold 12) 2). Residual by-products formed by the inner notching punch 60 are then discharged through the scrap discharge guider 28 disposed below the lower mold 20. At this time, when forming the blanked product 2 by forming the inner notching line in the eighth sector, the position setting pin 90 is also inserted into the pilot hole formed in the workpiece 2M, so that the position of the workpiece 2M The inner notching line is accurately formed on the workpiece 2M so that the blanking product 2 can be accurately formed.

In the present invention, the process of forming the blanked product 2 from the workpiece 2M while sequentially transferring the workpiece 2M from the first sector to the eighth sector of the mold assembly is one cycle. Such one cycle is repeated a necessary number of times to continuously produce the blanking product 2. Therefore, the present invention is referred to as a sequential transfer mold for finishing.

Therefore, the finishing sequential transfer mold according to the present invention having the above-described configuration has the following effects.

1. A piercing hole and a notching hole (blanking hole) are sequentially formed in the workpiece 2M while continuously feeding (transferring) the workpiece 2M so as to form the blanked article 2 in the workpiece 2M The present invention can be effectively utilized as a means for achieving the above objects.

2. The productivity of the product 2 is high since the pair of blanking products 2 are continuously produced in the working material 2M while sequentially transferring the processed material 2M to the mold assembly.

3. Each position setting pin 90 is inserted into the pilot hole of the workpiece 2M for each sequential process for forming the blanking product 2 in the workpiece 2M so that each of the piercing holes and the notching line process So that the precision of the blanking product 2 can be further improved.

4. Each time the workpiece 2M is sequentially transferred to the mold assembly, the workpiece 2M is slightly lifted from the lower mold 20 by the lift pins LP and MP, The workpiece 2M is caught by the workpiece 2M and can not be properly transported, so that a smooth function can be exerted in the sequential transport work.

5. At the feeding end of the mold assembly, the processing material 2M is sequentially supplied while the both sides of the processing material 2M are stably supported by the feeding guide roll 120. Thus, the working material 2M is turned off during feeding There is an effect of preventing a defect of the blanking product 2 from occurring in advance.

6. The upper holding mold 12 is provided with an insert piercing hole 30 formed in the upper movable mold 14, an inner piercing punch 50 insert hole, an outer notching punch insert hole and an inner notching punch 60 insert hole. The outer notching punch 30 and the inner piercing punch 50 and the outer notching punch and the inner notching punch 60 are inserted into the outer piercing punch 30 and the inner piercing punch 30, A first blanking curved surface portion is formed on the inner circumferential surface of the insert hole of the notch punch insert hole and the inner notching punch 60. The outer circumferential surface of the outer piercing punch 30, the inner piercing punch 50, the outer notching punch and the inner notching punch 60 A second blanking curved surface portion is formed.

Therefore, when the upper movable mold 14, which is a constitution of the upper mold 10, is advanced in a direction close to the upper surface of the lower mold 20, the upper movable mold 14 and the lower mold 20 are pressed The outer piercing punch 30, the inner piercing punch 50, the outer notching punch and the inner notching punch 60 are projected down from the bottom of the upper movable mold 14 while gripping the lower and upper surfaces of the upper and lower punching punches 2M, The outer diameter (outer peripheral surface) of the product 2 in the workpiece 2M forms the above-described piercing hole and the notching line.

At this time, a first blanking curved surface portion is provided on the inner circumferential surface of the insert hole, the outer notching punch insert hole and the inner notching punch 60 in the insert hole of the outer piercing punch 30 of the upper movable mold 14, the inner piercing punch 50, So that the piercing hole and the notching line of the product 2 pass along the first blanking curved surface portion at the same time when the product 2 is blanked and at the same time the outer piercing punch 30 and the inner piercing punch 50, The second blanking curved surface portion is also provided on the outer circumferential surface of the punch 60 so that the piercing hole and notching line of the product 2 pass through the second blanking curved surface portion during blanking of the product 2, The length of the blanking surface due to plastic deformation is longer than that of the surface blanked in the workpiece 2M.

Therefore, the present invention is characterized in that when a product 2 such as a precision washer or a precision plate is subjected to blanking, the first blanking curved surface portion and the second blanking curved surface portion, It is possible to maximize the length of the plastic working blanking surface due to the plastic deformation, so that the inside and outside precision of the workpiece 2 can be sufficiently ensured by using the universal press without using a dedicated press such as a fine blanking press, And it has a new advantage that the operation speed can be sufficiently increased. That is, when the product 2 is processed, it is not preferable that the blanking process surface is broken (plastically deformed), and it is preferable that the product is plastically deformed so as to be longer in the length of the front end face. In the present invention, the first blanking surface portion and the second blanking surface portion It is possible to sufficiently ensure the inner and outer precision of the workpiece 2 so that the first blanking curved surface portion and the second blanking curved surface portion have a significant meaning .

7. The inner piercing punch 50 includes a first inner piercing punch 52 disposed between a pair of outer piercing punches 30 and a second inner piercing punch 52 disposed between the second inner piercing punch 52 and the second inner piercing punch 52, Piercing punch 54 so as to form an internal piercing hole 6 having a smaller area by the first internal piercing punch 52 and to provide a second area by the second internal piercing punch 54 The work for forming the inner piercing hole 6 in the blanking product 2 is more accurate than that in forming the inner piercing hole 6 in the blanking product 2 because the large inner piercing hole 6 is formed More smoothly.

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

2M. 2. Material
4. Outer piercing hole 6. Internal piercing hole
8. Adhole 10. Upper mold
12. Upper Holding Mold 14. Upper Operation Mold
20. Lower mold 22. Base panel
24. Support posts 28. Scrap release guider
30. Outer piercing punch 40. Outer punching punch
50. Internal Piercing Punch 52. First Internal Piercing Punch
54. Second internal piercing punch 60. Internal notching punch
68. Drop guide member 70. Bending punch
72. First bending punch 74. Second bending punch
80. Pilot piercing pin 90. Position setting pin
92. Tapered pin portion 94. Pin bush
120. Feed guide roll

Claims (12)

A lower mold 20 and an upper mold 10 are disposed such that their inner surfaces face each other and the lower mold 20 and the upper mold 10 are adjacent to and spaced from each other;
An outer piercing punch 30 provided in the mold assembly to form an outer piercing hole 4 in a workpiece 2M to be fed between the lower mold 20 and the upper mold 10;
An outer notching punch (40) provided on the mold assembly to form an outer notching line of the product (2) to be blanked in the work material (2M);
An inner piercing punch (50) provided in the mold assembly to form an inner piercing hole (6) arranged inside the outer piercing hole (4) in the workpiece (2M);
An inner notching punch 60 for forming the outer notching line and the inner notching line formed on the working material 2M in the working material 2M so that the product 2 is blanked in the working material 2M; Wherein the first and second molds are arranged in a predetermined direction.
The method according to claim 1,
The outer piercing punch 30, the outer notching punch 40, the inner piercing punch 50, and the inner notching punch 60 are positioned symmetrically with respect to the longitudinal center line of the mold assembly, (2M), the outer piercing hole (4), the outer notching line, the inner piercing hole (6), and the inner notching line are formed on both sides of the longitudinal center line of the work material Wherein the first and second molds are formed in positions symmetrical with respect to the first and second molds, respectively.
The method according to claim 1,
A pilot piercing pin 80 provided in the mold assembly to form a pilot hole in the workpiece 2M;
And a position setting pin (90) provided in the mold assembly to be inserted into a pilot hole formed in the work material (2M) by the pilot piercing pin (80).
The method according to claim 1,
And a bending punch (70) provided in the mold assembly for bending a part of the entire area for forming the product (2) in the work material (2M).
5. The method of claim 4,
The bending punch (70)
A first bending portion 2FB is formed on the product 2 by first bending a part of the workpiece 2M to be transferred from the input end of the mold assembly to the discharge end to form the product 2. [ A first bending punch (72);
And a second bending punch (74) for bending a part of the first bending part (2FB) bent first by the first bending punch (72) to form a second bending part (2SB) Wherein the first and second molds are arranged in the same direction.
The method according to claim 1,
The outer notching punch (40) includes an outer upper notching punch portion and an outer lower notching punch portion arranged in a direction parallel to the longitudinal direction of the mold assembly when viewed from an upper surface of the mold assembly, and an outer notch punching portion And an outer bridge notching punch portion continuing to the lower notching punch portion and having curved sides intersecting with the longitudinal direction of the mold assembly. The mold assembly includes a pair of the outer notching punches 40, Wherein each of the outer notching punches (40) is disposed at positions symmetrical to each other with respect to a longitudinal center line of the mold assembly.
The method according to claim 1,
Wherein the mold assembly is provided with a product drop sector between a second escape sector and a discharge end, the inner notching punch (60) is disposed in the product drop sector, and the inner notching punch (60) An inner bridge notching punch portion disposed on a longitudinal center line of the mold assembly when seen from the inner bridge notching punch portion and a pair of inner punch portions extending from both ends of the inner bridge notching punch portion and arranged in a direction orthogonal to a longitudinal center line of the mold assembly. And a main notching punch portion.
8. The method of claim 7,
Wherein the dropping sector is provided with a drop guide member (68), and the drop guide members (68) are arranged in pairs in positions symmetrical with respect to the longitudinal center line of the mold assembly .
3. The method of claim 2,
The outer punching punch (30) is provided at a position adjacent to the input end of the mold assembly, and the outer notching punch (40) includes a first bending punch (72) and an outer punching punch (30) And the inner notching punch 60 is provided at a position adjacent to the discharge end of the mold assembly and between the inner notching punch 60 and the first bending punch 72, A second bending punch 74 is disposed and the mold assembly includes a first bending punch 74 and a first bending punch 74 disposed between the first bending punch 72 and the second bending punch 74, The inner piercing punch 50 includes a first inner piercing punch 52 disposed between the pair of outer piercing punches 30 and a second inner piercing punch 50 disposed between the inner notching punches 60, And a second inclined portion disposed in the first escape sector, And a second internal piercing punch (54) larger in cross-sectional area than the cross-sectional area of the secondary piercing punch (52).
10. The method of claim 9,
And an engraving punch (100) provided in the mold assembly to be disposed between the pair of first bending punches (72).
11. The method of claim 10,
Wherein the engraved punch (100) is disposed at each symmetrical position with respect to a longitudinal center line of the mold assembly.
The method according to claim 1,
Further comprising a feeding guide roll (120) provided at an input end of the mold assembly to feed a work material (2M) to a discharge end of the mold assembly.

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