KR20150109707A - A method for press forming - Google Patents

Abstract

The present invention relates to a press forming method comprising: a step of producing a first molded article by half-piercing a plate component; and a step of producing a second molded article by shaving the first molded article. The press forming method allows the production of the second molded article as a main product by the first and second press forming methods, wherein the second molded article has a precise cutting plane.

Description

[0001] A METHOD FOR PRESS FORMING [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming method, and more particularly, to a press forming press forming method capable of securing a precise cutting surface on a plate-like component.

The press forming method is a plastic working method widely used for manufacturing parts such as automobile parts, machines, electronic devices, etc., because it is capable of processing materials with high productivity and high precision.

The press forming apparatus itself is a machine that performs a relatively simple operation but enables complicated processing according to the shape of the mold used here.

Accordingly, by using such a press forming apparatus and a molding method, processing of a thin plate part and processing of a complicated shape can be performed relatively easily compared with other processing methods.

On the other hand, conventionally, in the case of machining a plate-like part requiring flatness such as a precision washer, a gear, a cam, and a latch, a method of obtaining a precision cut surface includes a punch mold for a blank- However, productivity and quality have deteriorated because two sets of molds and two steps are required.

That is, the shape of the cut surface of the product by blanking is composed of a roll-over, a burnish, a fracture, and the like. Depending on the use of the product, Therefore, it is necessary to perform a shaving process in which the first machined cutting surface is cut out of the fracture surface with a shear tool to obtain a smooth and clean cutting surface. Consequently, the mold 2 Set and two processes were required, resulting in a decrease in productivity and quality.

At this time, even if the shaving process is carried out after the blanking process, if the punches in the shaving process are worn out as the shaving process continues to progress, cracks may occur in the cut surface of the product A problem arises.

On the other hand, in order to solve such a problem, that is, two sets of molds and two steps are required, in order to solve the problem of deteriorating the productivity and quality, Korean Utility Model Application No. 1995-0001345 discloses a press- Discloses a blanking and saving structure of a press-formed die which is provided with a configuration for simultaneously performing a shaving operation and a shaving operation so as to be suitable for obtaining a flat cross-section of a drawn material.

However, although the Korean Utility Model Publication No. 1995-0001345 provides a structure capable of simultaneously performing blanking and saving, there is a problem that the press mold is too complicated to be applied in practice.

Further, since the above-described two sets of molds and two steps are required, in order to solve the problem of deteriorating the productivity and quality, there is a fine blanking method as a method widely used recently.

The fine blanking process is largely composed of a tool, a machine tool, a lubricant, and the like, and is advantageous in that it can produce a large quantity of products having a favorable cross-section, a precise dimension and a predetermined shape as compared with the general blanking method, It corresponds to a processing method which can obtain a valid cross-section over the whole plate thickness and shear contour by only one shearing process.

However, in the case of the fine blanking process, a special press capable of fine blanking is required,

Korean Public Utility Model No. 1995-0001345

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press forming method capable of securing a precision cut surface through a simple structure die.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to solve the above-mentioned problems, the present invention provides a method for manufacturing a semiconductor device, comprising: half-piercing a plate-shaped part to produce a first- And a step of scraping the first-stage molded article to produce a second-stage molded article.

Further, the present invention provides a press molding method wherein the first-stage molded article is a half-pierced plate-shaped part, and the half-pierced plate-shaped part includes a spare part area and a scraped area partially separated from the spare part area.

Further, the present invention provides a press forming method, wherein the spare parts area includes a part area and a dummy area extending inward of the part area, the scrap area including a flat area and a bent area bent from the flat area do.

The present invention also provides a press forming method, wherein the bending region includes an interface between the bending region and the dummy region, and the bending region is partially separated from the dummy region.

Further, the present invention provides a press molding method characterized in that the second-stage molded article is manufactured by separating the part area and the dummy area.

Further, the present invention provides a press molding method, wherein the dummy area is separated from the part area in a state where the dummy area and the scrap area are partially separated from each other. do.

According to the present invention as described above, it is possible to produce the present product as a second-stage molded article by the first and second-stage press molding methods, wherein the second- A press forming method can be provided.

Fig. 1B is a sectional view of a state in which blanking is performed, Fig. 1C is a cross-sectional view of the press- Fig. 1D is a partial state view of a product punched by a conventional metal mold; Fig.
FIGs. 2A and 2B are schematic sectional views showing a first step press forming method for obtaining a precise cut surface of a plate-like part according to the present invention, FIG. 2C is a first step for obtaining a precise cut surface of a plate- Sectional view showing a first-stage molded article according to a press forming method.
3A and 3B are schematic cross-sectional views showing a second step press forming method for obtaining a precision cut surface of a plate-like part according to the present invention, FIG. 3C is a second step for obtaining a precision cut surface of the plate- Sectional view showing a second-stage molded product according to a press forming method.
Figs. 4A and 4B are product realization views after the first-stage press forming process of the half-piercing process.
Figs. 5A and 5B are product images after the second stage press molding process of the shaving process. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. &Quot; and / or "include each and every combination of one or more of the mentioned items. ≪ RTI ID = 0.0 >

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a method of obtaining a precision cut surface when a plate-like component requiring smoothness of a cross section is processed by a general process will be described.

Fig. 1B is a sectional view of a state in which blanking is performed, Fig. 1C is a cross-sectional view of the press- Fig. 1D is a partial state view of a product punched by a conventional metal mold; Fig.

1A shows a state in which a press-forming mold 10 of an exemplary structure is in a state of being engaged with a press-punching mold 10 comprising a die holder 20 that moves up and down with respect to a stripper 31 of a punch holder 30. [ A punching plate 33 is provided on the upper surface of the punch holder 30 and a punch 40 and a return plate 41 are vertically installed on the upper surface of the punching plate 33, And the return plate 41 is fixed to the punch 40 and the return plate 41. The material removal stripper 31 is positioned at the upper end of the punch 40 and the return plate 41, The cushion pin 42 inserted through the punch holder 30, the punch holder plate 33, and the punch holder plate 32 is elastically supported.

The die holder 20 having the shank 20a fixed to the ram of the press has the die 21 having the pad 50 and the spacer 22 having the space that can be installed by the compression coil spring 51, And a die fixing plate 23 having a surface.

In the structure of the die holder 20, a pad hole 24 for inserting the pad 50 is formed in the die 21, and the pad hole 24 is formed to have a diameter larger than the diameter of the pad An insertion groove 25 having a large inner diameter is formed and the insertion groove 25 is provided with a shaving die piece 60 having the inner diameter of the pad 50 as the inner diameter.

At this time, the material of the shaving die piece 60 is selected to have sufficient strength to shave the material.

With this configuration, in the press-cut die having an exemplary structure, when the work W is placed on the stripper 31, the die holder 20 is lowered by the normal driving, The die 21 of the die holder 20 presses the resiliently received stripper 31 and the pad 50 of the die holder 20 simultaneously presses the stripper 31 And is pushed upward by the punch 40 of the punch holder 30.

The work W placed between the die 21 and the stripper 31 by the die 21 and the punch 40 is in a blanking state as shown in FIG.

The material W blanked by the momentary impact of the punch 40 and the die 21, as can be seen from the punched state shown in FIG. 1D, (Broken surface) C is formed at the lower end of the front end surface and a burr (broken surface) C is formed at the bottom end due to the material characteristics of the material. D may be formed.

The die 21 of the die holder 20 is further pressed downward by the stripper 31 and the punch 40 is moved in the direction in which the blank material And is pushed toward the shaving die piece 60 side.

When the work W passes the inner diameter 61 of the cutting die piece 60 by the punch 40, the circumferential edge of the work blanking die 60, which is blanked by the impact to a diameter larger than the diameter of the punch 40, The circumferential edge of the workpiece has a shape of a front end face in a state where the cutting operation is completed.

Further, when the ram of the press reaches the top dead center position, it moves to the bottom dead center position, and the material having the flat front circular section is separated from the shaping die piece 60.

In the press-cut die having the above-described exemplary structure, a circumferential edge of the material to be cut is successively formed by forming a cutting die piece at the pad position of the die to be blanked. In this state, As the cross-section is formed, the number of machining processes can be reduced.

That is, the conventional problem of obtaining a precision cut surface when machining a plate-like part requiring smoothness of a cross section, that is, a set of two molds and two steps, is required, so that productivity and quality are lowered Discloses a blanking and saving structure of a press-stamping die which is suitable for obtaining a flat cross-section in a drawn material by providing a constitution in which blanking and saving are simultaneously performed by a general universal press in a stamped product of a press .

However, although the method using the press-cut mold of the exemplary structure provides a structure capable of simultaneously performing the blanking and the saving, there is a problem that the press-cut mold is too complicated to be actually applied.

Therefore, Applicants of the present application are intending to provide a method of obtaining a precision cut surface, which is practically applicable.

Hereinafter, a method of obtaining a precision cut surface when machining a plate-like part requiring smoothness of a cross section according to the present invention will be described.

FIGs. 2A and 2B are schematic sectional views showing a first step press forming method for obtaining a precise cut surface of a plate-like part according to the present invention, FIG. 2C is a first step for obtaining a precise cut surface of a plate- Sectional view showing a first-stage molded article according to a press forming method.

The first-stage press forming method for obtaining a precise cut surface of the plate-like part according to the present invention can be implemented through the half-piercing press apparatus 100. [

2A, a half-pierced press apparatus 100 according to the present invention includes a die holder 130 for supporting a plate-shaped component 110, and a die holder 130 disposed at an upper portion of the die holder 130, And a punching holder 120 for pressing the plate-shaped part 110.

More specifically, the die holder 130 supports the plate member 110 in a state in which the plate member 110 is disposed, and also supports the die part 133 and the die part 130 positioned on the die holder 130, 133 and the cushion dies 131a, 131b.

Although the cushion die portions 131a and 131b are illustrated as being discontinuous in FIG. 2A for the sake of illustrating the sectional shape, the cushion die portions 131a and 131b may be formed in the shape of a ring, Can be disposed along the periphery of the portion 133.

On the other hand, in the case of the die portion 133, the die portion 133 is formed in a circular shape, although it may differ depending on the shape of the plate-like component to be processed, The die portions 131a and 131b can be disposed.

At this time, the cushion dies 131a and 131b have elastic portions 132a and 132b disposed below and serve to buffer the cushion dies 131a and 131b in the pressing process.

Although the cushion dies 131a and 131b are illustrated as being spaced apart from the plate-like component 110, the cushion dies 131a and 131b may be separated from the plate- And may be configured to be in contact with the plate-like component 110.

That is, the die holder 130 supports the plate-shaped part 110 in a state where the plate-shaped part 110 is disposed. At this time, And the cushion die portions 131a and 131b are configured to be in contact with the plate member 110 so that the plate member 110 can be supported by the plate member 110. [ can do.

2A, the punching holder 120 presses the plate-shaped part 110 by the upward and downward movement, and the punching pad part 122 and the punching part 122, which are located on the punching holder 120, And punching portions 121a and 121b located along the periphery of the punching pad portion 122.

2A, the punching portions 121a and 121b are shown as being discontinuous, but the punching portions 121a and 121b may be formed in the shape of a ring, (Not shown).

In the case of the punching pad portion 122, the punching pad portion 122 may be formed in a circular shape, and may extend along the circumference of the circular punching pad portion 122, The punching portions 121a and 121b may be disposed.

The elastic portion 123 is disposed under the punching pad portion 122 so that the punching portions 121a and 121b can function as a buffer in the pressing process.

In this case, the punching portions 121a and 121b may be spaced apart from each other by a predetermined distance in a direction perpendicular to the die 133.

That is, assuming that a virtual first vertical line is formed with respect to the outer end of the die 133, and a virtual second vertical line is formed with respect to the inner end of the punching portions 121a and 121b, The punching portions 121a and 121b may be disposed such that the first vertical line and the second vertical line are spaced apart from each other by a predetermined distance. This will be described later.

Next, referring to FIG. 2B, a first-stage press forming process is performed to obtain a precise cut surface of the plate-shaped component through the half-piercing press apparatus 110 according to the present invention. Hereinafter, And half-piercing the base 110 to manufacture a first-stage molded product.

That is, the step of half-piercing the plate-shaped part 110 corresponds to the step of lowering the punching holder 120 to half-pierce a certain region of the plate-like part 110 to produce a first-step molded product.

More specifically, when the punching holder 120 is lowered, the punching pad part 122 contacts the plate-like part 110 and is buffered by the elastic part 123, and the punching part 121a And 121b are continuously lowered to half-pierce the plate-like part 110 in the area corresponding to the punching parts 121a and 121b.

Meanwhile, when the punching portions 121a and 121b are continuously lowered, the cushion die portions 131a and 131b are buffered by the elastic portions 132a and 132b while being in contact with the punching portions.

The half-pierced state of the plate-like component 110 is shown in FIG. 2C.

Referring to FIG. 2C, the half-pierced plate-shaped part 110 includes spare parts areas 110a and 110b and scrap areas 112 partially separated from the spare parts areas 110a and 110b.

The spare parts area 110a and 110b may include a part area 110a and a dummy area 110b extending inward of the parts area 110a. The scrap area 112 may be a flat area And a bending region 112a that is bent from the flat region 112b and includes boundary surfaces 111a and 111b between the bending region 112a and the dummy region 110b, The bending region 112a corresponds to a state partially separated from the dummy region 110b.

That is, in the present invention, the plate-shaped part 110 is half-pierced to manufacture the spare parts area 110a and 110b and the scraped area 112 partially separated from the spare parts area 110a and 110b, , And the scrap region 112 is formed so as to include the bending region 112a.

As described above, a virtual first vertical line is formed on the basis of the outer end of the die 133, and a virtual second vertical line is formed based on the inner end of the punching portions 121a and 121b The punching portions 121a and 121b may be disposed such that the first vertical line and the second vertical line are spaced apart from each other by a predetermined distance.

This is to form the bent region 112a shown in FIG. 2C, that is, to form the bent region 112a at a predetermined interval apart from the punching portions 121a and 121b and the die portion 133 .

3A and 3B are schematic cross-sectional views showing a second step press forming method for obtaining a precision cut surface of a plate-like part according to the present invention, FIG. 3C is a second step for obtaining a precision cut surface of the plate- Sectional view showing a second-stage molded product according to a press forming method.

The second-stage press forming method for obtaining a precise cut surface of the plate-like part according to the present invention can be realized through the shaving press apparatus 200. [ On the other hand, the shaving press apparatus 200 to be described later can refer to the half-piercing press apparatus described above, except as described below.

3A, a saving press apparatus 200 according to the present invention includes a die holder 230 for supporting the plate-shaped part 110 processed by the first step and a die holder 230 for holding the plate- And a punching holder 220 for pressing the plate-shaped part 110 by upward and downward movement.

More specifically, the die holder 230 supports the plate member 110 in a state in which the plate member 110 is disposed, and also supports the die part 233 and the die part 233 located on the die holder 230, 233 disposed on the periphery of the cushion die portions 231a, 231b.

At this time, in order to easily support the first-stage molded product molded in the half-piercing press device, the die portion 233 in the saving press device is different from the die portion in the above-described half- 233a and an inclined portion 233b.

That is, as shown in FIG. 2C, the scrap region 112 of the first-stage molded product may include a flat region 112b and a bent region 112a that is bent from the flat region 112b, The die portion 233 can be formed by reflecting the shape of the region 112b and the bending region 112a.

The elastic portions 232a and 232b are disposed under the cushion dies 231a and 231b so that the cushion dies 231a and 131b function as a buffer during the pressing process. And therefore detailed description thereof will be omitted below.

2A shows that the cushion die portions 231a and 231b are spaced apart from the plate-like component 110. However, the cushion die portions 231a and 231b are not shown in the drawings, And may be configured to be in contact with the plate-like component 110.

3A, the punching holder 220 presses the plate-shaped part 110 by upward and downward movement, and the punching pad part 222 and the punching part 222, which are positioned on the punching holder 220, And punching portions 221a and 221b positioned along the circumference of the punching pad portion 222.

The elastic part 223 is disposed under the punching pad part 222 to serve as a buffer for the punching parts 221a and 221b in the pressing process. Since this is the same as described above, a detailed description will be omitted.

At this time, the punching portions 221a and 221b are preferably spaced apart from each other by a predetermined distance in a direction perpendicular to the die portion 233.

That is, assuming that a virtual first vertical line is formed with respect to the outer end of the die 233 and a virtual second vertical line is formed with respect to the inner end of the punching portions 221a and 221b, The punching portions 221a and 221b may be disposed such that the first vertical line and the second vertical line are spaced apart from each other by a predetermined distance.

At this time, it is preferable that the predetermined interval is the interval of the dummy area 110b in the spare parts area of the first-stage molded product, which will be described later.

Next, referring to FIG. 3B, a second stage press molding for obtaining a precise cut surface of the plate-shaped part is performed through the saving press apparatus 200 according to the present invention. Hereinafter, Is defined as a step of manufacturing the present product as a second-step molded product.

More specifically, when the punching holder 220 is lowered, the punching pad part 222 contacts the plate-like part 110 and makes a buffering action by the elastic part 223, and the punching part 221a And 221b are continuously lowered to save the plate-like part 110 in the area corresponding to the punching parts 221a and 221b.

On the other hand, when the punching portions 221a and 221b are continuously lowered, the cushion die portions 231a and 231b abut against the punching portions and perform the buffering action by the elastic portions 232a and 232b.

The state in which the plate-like component 110 is shaved is as shown in FIG. 3C.

Referring to FIG. 3C, by separating the parts area 110a and the dummy area 110b from each other by the second-stage press molding through the shaving press apparatus 200, the present product as a second-stage molded product is manufactured.

At this time, when the second-stage molded product, that is, the remaining region except for the product, is observed, the dummy region 110b and the scrap region 112 are separated from each other, .

As described above, a virtual first vertical line is formed with reference to the outer end of the die portion 233, and a virtual second vertical line is formed with reference to the inner end of the punching portions 221a and 221b The punching portions 221a and 221b may be disposed such that the first vertical line and the second vertical line are spaced apart from each other by a predetermined distance. It is preferable that the interval is the interval of the dummy area 110b.

That is, in the present invention, since the above-described part area 110a and the dummy area 110b are separated by the second-stage press forming, the punching parts 221a and 221b are formed by the distance between the dummy areas 110b And is spaced apart from the die portion 233.

By the press molding method of the first step and the second step as described above, the present product as a second step molded article can be produced, and the second step molded article has a precise cutting surface.

It is judged that the reason for having the precision cut surface by the press forming method divided into the above two steps is as follows.

As described above, in the first-stage press molding, the first-stage molded product including the scrap region 112 partially separated from the spare component regions 110a and 110b and the spare component regions 110a and 110b is manufactured At this time, the spare parts areas 110a and 110b may include a parts area 110a and a dummy area 110b extending inward of the parts area 110a.

At this time, stress can be concentrated in the dummy area 110b by the press molding in the first step.

Therefore, in the present invention, by separating the dummy area in which the stress is concentrated from the product in the second-step press-molding, it is possible to have a precision cut surface.

On the other hand, the dummy area can be removed by the second-stage press molding process, and in the case of the dummy area, since it is manufactured in a state partially separated from the scrap area in the first-stage press molding, It is determined that the dummy area can be sufficiently separated.

As described above, in the present invention, by proceeding to the first-stage press molding process of the half-piercing process and the second-stage press-molding process of the shaving process, the product as the second-stage molded product can have a precision cut surface.

Figs. 4A and 4B are product realization views after the first-stage press forming process of the half-piercing process.

4A and 4B, the first-stage molded part 300 may include a spare part area 310 and a scraped area 320 partially separated from the spare part area 310.

Figs. 5A and 5B are product images after the second stage press molding process of the shaving process. Fig.

Referring to FIGS. 5A and 5B, the second-stage molded product 300 includes a component region 310 ', wherein the component region 310' includes the spare region 310 of FIGS. 4A and 4B, In which the dummy region is separated.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: half piercing press device
110: Plate part 130: Die holder
120: Punching holder

Claims (6)

Half-piercing the plate-shaped part to produce a first-stage molded product; And
And a step of scraping the first-stage molded article to produce a second-stage molded article. The method according to claim 1,
Wherein the first-stage molded product is a half-pierced plate-
Wherein the half-pierced plate-shaped part includes a spare part area and a scraped area that is partially separated from the spare part area. 3. The method of claim 2,
The spare part area including a part area and a dummy area extending inward of the part area,
Wherein the scrap region comprises a flat region and a bent region bent from the flat region. The method of claim 3,
Wherein the bending region includes an interface between the bending region and the dummy region, and the bending region is partially separated from the dummy region. The method of claim 3,
Wherein the second-stage molded product is manufactured by separating the part area and the dummy area. 6. The method of claim 5,
The part area and the dummy area are separated from each other,
Wherein the dummy area is separated from the part area in a state where the dummy area and the scrap area are partially separated.

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