KR20190124948A - A drawing apparatus for thicken-drawing a bending portion and a method for operating the same - Google Patents

Abstract

The present invention relates to a drawing device for thicken-drawing a bending part and an operating method thereof. According to one embodiment of the present invention, the drawing device for thicken-drawing the bending part comprises: a punch (100) for processing drawing of a workpiece (A) to manufacture a semi-finished product (B); a punch holder (200) for moving the punch (100) up and down by an operation of a first actuator (T1); a die (300) for supporting the workpiece (A) when the punch (100) is inserted into the inside; and a knock out (400) for withdrawing the semi-finished product (B) from the die (300). According to the present invention, a durability of the semi-finished product can be greatly increased as a bent part can manufacture a thickened semi-finished product.

Description

Drawing device for drawing drawing of bending part and its operation method {A DRAWING APPARATUS FOR THICKEN-DRAWING A BENDING PORTION AND A METHOD FOR OPERATING THE SAME}

The present invention relates to a drawing device for drawing a bent portion thickened and a method of operating the same, and more particularly, by removing the blank holder from the existing drawing device to prevent the spring back phenomenon of the semi-finished product, The present invention relates to a drawing apparatus for thickening and drawing a bent portion capable of producing a semi-finished product that can be produced in one process by increasing the thickness and preventing cracks in the bent portion, and a method of operating the same.

1 and 2, a conventional drawing device must have a blank holder to secure the workpiece on the die. The blank holder is a component that grabs the end of the workpiece with high pressure to prevent wrinkles on the end of the semifinished product.

However, in the conventional drawing device, as the blank holder grabs the workpiece as described above, the punch is lowered to form the semifinished product, so that the side surface of the formed semifinished product is opened by a spring back phenomenon. There was this. The spring back phenomenon refers to a phenomenon in which the amount of bending decreases due to the elasticity to recover to the original state when the material is bent and then the pressure is removed in the bending process of the plastic material. In other words, the blank holder generates residual stress in the outward direction of the semi-finished product during semi-finished processing, and spring back occurs due to the residual stress inherent in the semi-finished product (see FIG. 3 (a)).

In addition, since the semi-finished product molded by the conventional drawing device is tensioned by the blank holder and the punch, the bent portion is inevitably formed thinner than other portions. Therefore, this semi-finished product has a problem that cracks easily occur at the bent portion (see FIG. 3 (b)).

Patent Registration No. 10-1111953 (2012.01.27)

The present invention has been made to solve the above problems, and an object of the present invention is to provide a drawing apparatus and a method of operating the thickened drawing can be produced by producing a semi-finished product with the bending portion in one process.

According to an embodiment of the present invention, a drawing apparatus for thickening and drawing a bent portion includes: a punch 100 for drawing a workpiece A to produce a semi-finished product B; A punch holder (200) for moving the punch (100) up and down by the operation of a first actuator (T1); A die 300 for supporting the workpiece A when the punch 100 is inserted into the inside; And a knockout 400 for withdrawing the semi-finished product B from the die 300.

The punch 100 includes a pressing unit 110 protruding downward from the punch holder 200 to press the semi-finished product B so as to thicken the bent portion of the semi-finished product B; And a space forming part 120 protruding downward from the pressing part 110 to form an internal space of the semi-finished product B.

The die 300 may include a die upper surface 310 in contact with a lower surface of the punch holder 200 when the first actuator T1 is operated; A die groove 320 into which the punch 100 is inserted and forming a thickening processing space C having the same shape as that of the semi-finished product B between the punch 100; An inclined surface 330 inclined at an angle θ from the die upper surface 310 toward the die groove 320; And a connection surface 340 rounded with a predetermined curvature R to connect the inclined surface 330 and the upper outer circumferential surface of the die groove 320 to each other.

The predetermined angle θ is characterized in that formed from 16 ° to 20 °.

The predetermined angle θ is characterized in that it is formed to 18 °.

The predetermined curvature R is characterized in that formed in 28 to 32.

The predetermined curvature R is characterized in that formed in 30.

Width (a) of the die groove 320 and the width (b) of the pressing unit 110 is characterized in that the following equation.

Width (a) of the die groove 320, the processing thickness (d`) of the semi-finished product (B) and the width (c) of the space forming unit 120 is characterized by satisfying the following equation.

The width e of the workpiece A, the width a of the die groove 320, and the length f of the portion of the workpiece A that spans the die 300 satisfy the following equation. It is characterized by.

The ratio g of the length f of the portion A of the workpiece A that spans the die 300 to the width e of the workpiece A and the thickness d of the workpiece A are as follows. It is characterized by satisfying the equation.

The drawing coefficient, which is a ratio of the width h of the semi-finished product B to the width e of the workpiece A, is characterized by satisfying the following equation.

The planar shape of the die groove 320 and the planar shape of the pressing unit 110 is characterized in that any one of a circular, hexagonal, octagonal, octagonal.

The planar shape of the space forming unit 120 is characterized in that any one of a circular, hexagonal, octagonal, octagonal.

The knockout 400, the punch receiving plate 410, the workpiece (A) is seated on the top; A knockout pin 420 extending downward from the lower portion of the punch support plate 410 to penetrate the die 300; And a die cushion 430 supporting the knockout pin 420 and being lifted by the operation of the second actuator T2 to draw the semi-finished product B from the die 300. .

According to another embodiment of the present invention, a method of operating a drawing apparatus for thick drawing a bent portion includes a method of forming a workpiece A on a center line D connecting a center of a punch 100 and a center of a die groove 320. Positioning the center (S100); The punch (100) is lowered by the operation of the first actuator (T1) in contact with the workpiece (A) (S200); While the punch 100 is inserted into the die groove 320 until the punch receiving plate 410 contacts the die groove 320, the workpiece A is bent to form a semi-finished product B ( S300); And pressing unit 110 pressurizes the semi-finished product B to thicken the bent portion of the semi-finished product B (S400).

Method of operating the drawing device for drawing the bent portion thickening step of the operation of the first actuator (T1) is stopped, the punch 100 is returned to its original position (S500); And the punch receiving plate 410 is raised by the operation of the second actuator (T2), the step of drawing out the semi-finished product (B) with the bent portion thickened from the die groove 320 (S600); It is characterized by.

As described above, according to the present invention, since the bent portion can produce a semi-finished product, the durability of the semi-finished product can be greatly increased (see FIG. 4).

In addition, according to the present invention, since it is possible to produce a semi-finished product in which the bent portion is thickened by only one processing, the work productivity can be greatly improved.

In addition, according to the present invention can prevent the spring back phenomenon of the semi-finished product, it is possible to produce a semi-finished product of precise specifications.

1 and 2 illustrate a conventional drawing device.
3 illustrates a problem of a product processed by a conventional drawing device.
4 is a perspective view and a front view of the semi-finished product (B) processed by the present invention.
Figure 5 is a view comparing a semi-finished product (B) processed by the present invention with a product processed by the prior art.
6 and 7 illustrate a drawing apparatus for thick drawing a bent portion according to the present invention.
FIG. 8 is a diagram illustrating an effect according to a predetermined angle (θ) condition of the present invention. FIG.
It is a figure explaining the effect by the condition of the ratio (g) of the length (f) of the part (A) of the workpiece | work A to the width | variety of the workpiece | work A across the die 300 of the workpiece | work A of this invention.
10 is a flow chart of a method of operating a drawing device for drawing thickened portions according to the invention.
11 to 16 illustrate an operating state according to FIG. 10.

The terms or words used in this specification and claims are not to be limited to the ordinary or dictionary meanings, and the principle that the inventor may appropriately define the concept of terms in order to best describe the invention of his own. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be water and variations. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

6 and 7 illustrate a drawing apparatus for thick drawing a bent portion according to the present invention. 6 and 7, the drawing apparatus for thickening and drawing the bent portion according to the present invention includes a punch 100, a punch holder 200, a die 300, and a knockout 400.

The punch 100 serves to generate the semi-finished product B by drawing the workpiece A, and the punch 100 includes a pressing part 110 and a space forming part 120. At this time, the pressing unit 110 is formed to protrude downward from the punch holder 200, and serves to press the semi-finished product (B) to increase the bending portion of the semi-finished product (B). In addition, the space forming unit 120 is protruded downward from the pressing unit 110, and serves to form the internal space of the semi-finished product (B).

The punch holder 200 serves to move the punch 100 up and down by the operation of the first actuator T1. That is, when the punch 100 moves downward by the operation of the first actuator T1, the space forming unit 120 bends the workpiece A to form the semi-finished product B, and then the pressurizing unit 110. ) Pressurizes the semi-finished product (B) to thicken the bent portion of the semi-finished product (B) (see FIG. 7).

The die 300 serves to support the workpiece A when the punch 100 is inserted into the die 100, and the die 300 has a die upper surface 310, a die groove 320, and an inclined surface 330. ) And a connection surface 340. The die upper surface 310 is a surface which is in contact with the lower surface of the punch holder 200 when the first actuator T1 is operated, and is formed to be parallel to the lower surface of the punch holder 200.

The die groove 320 is a groove into which the punch 100 is inserted, and forms a thickening processing space C having the same shape as that of the semi-finished product B between the punch 100 (see FIG. 7). ). That is, the lower surface and the outer surface of the thickening processing space (C) is formed by the die groove 320, the upper surface of the thickening processing space (C) is formed by the lower surface of the pressing unit 110, The inner surface of the thickening processing space C is formed by the outer surface of the space forming part 120.

At this time, the planar shape of the die groove 320 and the planar shape of the pressing unit 110 may be formed of any one of a circular, hexagonal, octagonal, octagonal. In addition, the planar shape of the space forming unit 120 may be formed of any one of a circular, hexagonal, octagonal, pentagonal.

The planar shape of the die groove 320 and the planar shape of the pressing part 110 should be the same shape, but the planar shape of the space forming part 120 does not necessarily need to be the same. For example, the planar shape of the die groove 320 and the planar shape of the pressing unit 110 may be octagonal, and the planar shape of the space forming unit 120 may be circular (see FIG. 8).

The inclined surface 330 is formed to be inclined at a predetermined angle θ from the die upper surface 310 toward the die groove 320. In this case, the predetermined angle θ is formed from 16 ° to 20 °, more preferably 18 °. The inclined surface 330 is an essential element to omit the prior art blank holder, and the predetermined angle θ range of the inclined surface 330 has been derived as an optimized range through a number of experiments.

That is, when the predetermined angle θ is within 16 ° to 20 °, wrinkles do not occur at the end of the semi-finished product (B) even without the blank holder, but it is confirmed that wrinkles occur at the end of the semi-finished product (B) in other ranges. Can be. (See FIG. 8)

The connection surface 340 is formed to be rounded with a predetermined curvature R to connect the inclined surface 330 and the upper outer peripheral surface of the die groove 320. The predetermined curvature R is formed to 28 to 32, more preferably 30. The connecting surface 340 is lowered along the inclined surface 330, and before the workpiece A, which is primarily deformed, is formed into the semi-finished product B in the die groove 320, it is second to induce deformation. Configuration.

As the connection surface 340 is rounded to a predetermined curvature R, it is possible to minimize the occurrence of damage to the surface of the workpiece (A). At this time, the predetermined curvature (R) range of the connection surface 340 was derived as an optimized range through a number of experiments.

The components of the punch 100, the punch holder 200, and the die 300 as described above satisfy the following relationship in order to produce a semifinished product having a bent portion.

First, the width a of the die groove 320 and the width b of the pressing unit 110 satisfy Equation 1 below. That is, the width a of the die groove 320 is 1.03 times wider than the width b of the pressing part 110.

In addition, the width (a) of the die groove 320, the processing thickness (d`) of the semi-finished product (B) and the width (c) of the space forming unit 120 satisfies the following equation (2). That is, the width c of the space forming part 120 is a difference between a width a of the die groove 320 and a double value of the processing thickness d ′ of the semi-finished product B.

Accordingly, while preventing the friction between the punch 100 and the die 200 during the operation of the present invention, it is possible to form a nearly closed thickening processing space (C) to form a precise semi-finished product (B).

The width e of the workpiece A, the width a of the die groove 320, and the length f of the portion of the workpiece A that spans the die 300 satisfy the following equation. . That is, the length f of the portion of the workpiece A that spans the die 300 is half the difference between the width e of the workpiece A and the width a of the die groove 320. will be.

In addition, the ratio (g) of the length (f) of the portion (A) of the workpiece (A) over the die 300 to the width (e) of the workpiece (A) and the thickness (d) of the workpiece (A) are as follows. Satisfies Equation 4 below.

For example, when the thickness (d) of the workpiece (A) is 4.0 mm, the ratio (g) should be 20% or more, and when the thickness (d) of the workpiece (A) is 5.0 mm, the ratio is (g) should be 23% or more, and when the thickness (d) of the workpiece (A) is 6.0 mm, the ratio (g) should be 25% or more. As a result of the experiment, when the above conditions are not satisfied, it can be confirmed that a crack occurs in the bent portion of the semi-finished product (B). (See FIG. 9)

The drawing coefficient, which is the ratio of the width h of the semi-finished product B to the width e of the workpiece A, satisfies Equation 5 below. That is, even when the workpiece A is processed into the semi-finished product B, the ratio of the width must be 53% or more, and when processed to less than 53%, cracks are generated at the bent portion.

The knockout 400 serves to withdraw the semi-finished product B from the die 300, and the knockout 400 includes a punch support plate 410, a knockout pin 420, and a die cushion 430. The workpiece A is seated on an upper portion of the punch receiving plate 410. In addition, the upper shape of the punch receiving plate 410 is formed to correspond to the lower shape of the semi-finished product (B).

The knockout pin 420 extends downward from the lower portion of the punch support plate 410 to penetrate the die 300, and the die cushion 430 supports the knockout pin 420, and the second actuator T2. It rises by the operation of) and serves to withdraw the semi-finished product (B) from the die (300).

10 is a flowchart illustrating a method of operating a drawing apparatus for thick drawing a bent portion according to the present invention, and FIGS. 11 to 16 are views illustrating an operating state according to FIG. 10. Referring to Figures 10 to 16, the operation method of the drawing device for drawing draw thickening portion according to the present invention is the step (S100), the contacting step (S200), the forming step (S300), the step of thickening (S400).

In step S100, the center of the workpiece A is positioned on the centerline D connecting the center of the punch 100 and the center of the die groove 320. At this time, the end of the workpiece (A) is in contact with the inclined surface (3330). Accordingly, the height of the semi-finished product (B) processed by the operation of the present invention can be formed uniformly to minimize the defective rate (see Fig. 11).

In the step of contacting (S200), the punch 100 is lowered by the operation of the first actuator (T1) to contact the workpiece (A). That is, the lower surface of the space forming unit 120 is in contact with the upper surface of the workpiece (A). (See Figure 12)

In the forming step (S300), the punch 100 is inserted into the die groove 320 until the punch receiving plate 410 contacts the die groove 320. Accordingly, the workpiece (A) is bent to form a semi-finished product (B). That is, i) the workpiece (A) pressed by the space forming unit 120 is first deformed (bending) while descending along the inclined surface 330, ii) after the workpiece (A) in the connecting surface 340 Secondly deformed (bended) at a larger angle, and iii) finally deformed thirdly such that the sidewall of semifinished product B is located between the inner surface of die groove 320 and the outer surface of space forming portion 120. Bending). By sequentially deforming the workpiece A in this manner, breakage of the workpiece A caused by sudden deformation can be prevented (see FIG. 13).

In the step of thickening (S400), the pressing unit 110 pressurizes the semi-finished product B to thicken the bent portion of the semi-finished product B. That is, the pressing unit 110 presses the upper sidewall of the semi-finished product B downward, thereby plastic deformation of the semi-finished product B so as to fill the empty space in the thickening processing space C. (See Figure 14)

In the returning step S500, the operation of the first actuator T1 is stopped, and the punch 100 returns to its original position (see FIG. 15). In addition, in the drawing step (S600), the punch support plate 410 is raised by the operation of the second actuator (T2), and withdraws the semi-finished product (B) having the bent portion thickened from the die groove (320) ( See FIG. 16). By the step S500 and the step S600 taken out, the worker can easily discharge and package the thickened semi-finished product B. This improves workability and minimizes the risk of worker safety accidents.

By the application of the present invention as such, it is possible to remove the blank holder which has caused the problem of the conventional drawing apparatus. In other words, it is possible to solve the problem of spring back phenomenon due to the blank holder and cracking in the bent portion. At the same time, even if the blank holder is removed, wrinkles can be sufficiently prevented from occurring at the end of the semi-finished product B.

Therefore, compared with the prior art, in particular, the thicker the workpiece (A) can solve the problem of the semi-finished side that is a problem, and the bent part crack of the semi-finished product (B) by producing a drawing semi-finished product with the bent portion thickened ) Can be prevented (see FIGS. 4 and 5). And by removing the blank holder of the conventional drawing device to significantly reduce the production cost of the equipment, it is possible to significantly improve workability by omitting the blank holder operating step.

The above-described embodiment is just a preferred embodiment for those skilled in the art to which the present invention pertains (hereinafter, referred to as a person skilled in the art) to easily carry out the present invention. Since the present invention is not limited thereto, the scope of the present invention is not limited thereto. Therefore, it will be apparent to those skilled in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention, and it is apparent that parts easily changed by those skilled in the art are included in the scope of the present invention. .

100 punch
110 Pressurization
120 Space Formation Part
200 punch holder
300 die
310 die top surface
320 die groove
330 slope
340 connection surface
400 knockouts
410 punch support plate
420 knockout pins
430 die cushion
A workpiece
B semi-finished product
C thickening processing space
D centerline
T1 first actuator
T2 2nd Actuator

Claims (16)

A punch 100 for drawing the workpiece A to produce a semifinished product B;
A punch holder (200) for moving the punch (100) up and down by the operation of a first actuator (T1);
A die 300 for supporting the workpiece A when the punch 100 is inserted into the inside; And
A knockout (400) for withdrawing the semi-finished product (B) from the die (300);
In the drawing device for drawing thickened bending portion including a,
The punch 100,
A pressing unit 110 protruding downward from the punch holder 200 to press the semi-finished product B to thicken the bent portion of the semi-finished product B; And
A space forming unit 120 protruding downward from the pressing unit 110 to form an internal space of the semi-finished product B;
Drawing device for drawing thickened bending portion comprising a. The method of claim 1,
The die 300 is,
An upper die surface 310 in contact with a lower surface of the punch holder 200 when the first actuator T1 is operated;
A die groove 320 into which the punch 100 is inserted and forming a thickening processing space C having the same shape as that of the semi-finished product B between the punch 100;
An inclined surface 330 inclined at an angle θ from the die upper surface 310 toward the die groove 320; And
A connection surface 340 rounded to a predetermined curvature R to connect the inclined surface 330 and the upper outer circumferential surface of the die groove 320;
Drawing device for drawing thickened bending portion comprising a. The method of claim 2,
The predetermined angle (θ) is a drawing device for thick drawing the bent portion, characterized in that formed in 16 ° to 20 °. The method of claim 3, wherein
The drawing device for thickening and drawing a bent portion, characterized in that the predetermined angle (θ) is formed at 18 °. The method of claim 2,
The predetermined curvature (R) is drawing device for thickening drawing the bent portion, characterized in that formed in 28 to 32. The method of claim 5,
Drawing device for drawing thickened bending portion, characterized in that the predetermined curvature (R) is formed to 30. The method of claim 2,
The width (a) of the die groove (320) and the width (b) of the pressing portion (110) drawing device for drawing thickened drawing, characterized in that the following equation.

The method of claim 2,
The width (a) of the die groove 320, the processing thickness (d`) of the semi-finished product (B), and the width (c) of the space forming unit 120 satisfies the following equation Drawing device for drawing thickened area.

The method of claim 2,
The width e of the workpiece A, the width a of the die groove 320, and the length f of the portion of the workpiece A that spans the die 300 satisfy the following equation. Drawing device for drawing thickened bending portion, characterized in that.

The method of claim 2,
The ratio g of the length f of the portion A of the workpiece A that spans the die 300 to the width e of the workpiece A and the thickness d of the workpiece A are as follows. Drawing device for thickening drawing the bent portion, characterized in that to satisfy the equation.

The method of claim 2,
Drawing device for drawing thickening the bent portion, characterized in that the drawing coefficient, which is the ratio of the width (h) of the semi-finished product (B) to the width (e) of the workpiece (A) satisfy the following equation .

The method of claim 2,
The planar shape of the die groove 320 and the planar shape of the pressing unit 110 is a drawing device for drawing thickened portion, characterized in that any one of a circular, hexagonal, octagonal, octagonal. The method of claim 2,
The planar shape of the space forming unit 120 is a drawing device for drawing thickening the bent portion, characterized in that any one of circular, hexagonal, octagonal, octagonal. The method of claim 1,
The knockout 400,
A punch support plate 410 on which the workpiece A is seated;
A knockout pin 420 extending downward from the lower portion of the punch support plate 410 to penetrate the die 300; And
A die cushion 430 supporting the knockout pin 420 and being lifted by the operation of a second actuator T2 to withdraw the semi-finished product B from the die 300;
Drawing device for drawing thickened bending portion comprising a. In the method of operating a drawing device for thickening and drawing the bent portion of any one of claims 1 to 14,
Positioning the center of the workpiece A on the center line D connecting the center of the punch 100 and the center of the die groove 320 (S100);
The punch (100) is lowered by the operation of the first actuator (T1) in contact with the workpiece (A) (S200);
While the punch 100 is inserted into the die groove 320 until the punch receiving plate 410 contacts the die groove 320, the workpiece A is bent to form a semi-finished product B ( S300); And
Pressing unit 110 pressurizes the semi-finished product (B) to increase the bending portion of the semi-finished product (B) (S400);
Operating method of the drawing device for drawing thickening the bent portion comprising a. The method of claim 15,
The operation of the first actuator (T1) is stopped and the punch (100) is returned to its original position (S500); And
The punch receiving plate (410) is raised by the operation of the second actuator (T2), the step of withdrawing the semi-finished product (B) with the bent portion is increased from the die groove (320) (S600);
Operating method of the drawing device for drawing thickening the bent portion further comprising a.

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