KR101116150B1 - Press molding processing method for corner molding of press product - Google Patents

Abstract

The present invention relates to a corner forming mold apparatus and a processing method of a press work, the object of which is to form a corner forming mold apparatus of the press work that can prevent the minimization of the radius of curvature of the corner-side curvature generated during the molding process, and its thickness In providing a processing method.

The present invention uses a top mold including a movable auxiliary punch that is lifted and lowered from a punch by a driving means, and firstly forms a workpiece through a lower surface of the movable auxiliary punch; Second bending forming the workpiece through the movable auxiliary punch and the punch; Cutting-molded the upper end of the workpiece using the stepped surface formed on the sidewall of the punch; Using the movable auxiliary punch and the stepped surface, a third bending molding of the workpiece is performed by raising a simultaneous mobility auxiliary punch for pressing the workpiece; The technical gist of the apparatus for forming corners of a press-formed product and a processing method using the same by using the movable auxiliary punch and the lower surface and the step surface of the punch to complete the corner molding.

Press, Bending, Corner, Bending, Punch

Description

Press molding processing method for corner molding of press product}

The present invention relates to a mold apparatus, and more particularly, to a mold apparatus capable of minimizing the radius of curvature of a corner molding portion of a press work, and to implementing a thickness reinforcement of the corner molding portion, and a processing method using the mold apparatus.

The initial plate-like workpiece, such as housings, brackets, covers, etc. of various machines, is molded using the press mold apparatus to form an arbitrary shape from the original plate-shaped workpiece.

Particularly, the present invention relates to a mold apparatus for processing a molded article having two corners on the opposite side of the opening, in which the cross-sectional shape of the molded article forms a '∪' shape and one side is opened. .

Corners in which both sides of the molding according to the present invention abut each correspond to a bent portion forming a vertical state, and in the following description, the corner is used collectively as the term 'corner'.

1 to 3 illustrate an example of a mold apparatus for forming a corner of a conventional press work. The apparatus for forming a conventional corner includes an upper mold 2 having a punch 2a protruding from a central bottom portion, and a workpiece ( 3) and a lower mold 1 having a forming groove 1a formed corresponding to the punch 2a so that the punch 2a is inserted.

Looking at the molding process of the workpiece by the conventional mold apparatus, after placing the plate-shaped workpiece (3) heated to a predetermined temperature on the upper surface of the lower mold (1), the upper mold (2) is lowered. In this process, the tip of the punch 2a of the upper mold 2 is brought into close contact with the workpiece 3 first, and the punch 2a is lowered together with the workpiece 3 by the lowering of the upper mold 2. It is inserted into the forming groove (1a) of the.

At this time, when the punch 2a of the upper mold 2 enters the forming groove 1a of the lower mold 1, the workpiece 3 is supported by the corner 1b of the forming groove 1a and is bent. In this case, a strong friction load is generated at the corners of the workpiece 3 due to the downward movement of the workpiece 3 by the punch 2a and the bearing force of the edge 1b on the side of the molding groove 1a. .

The frictional load generated at the time of entry of the punch 2a is pre-heated to increase the workpiece 3 to maintain a high elongation, thereby reducing the thickness of the corner portion to be formed later.

4 is an enlarged view of portion 'A' of FIG. 3, in which the punch 2a of the upper mold 2 is inserted into the forming groove 1a of the lower mold 1 with the workpiece 3 interposed therebetween. The molding operation of the simultaneous workpiece 3 to which entry is completed is completed, in which the thickness d of the corner 3c of the workpiece 3 during the entry of the punch 2a toward the molding groove 1a as described above. The outer curvature radius R of the corner 3c of the work piece 3 is not fully filled by the die shape portion (molding space), which is an area between the punch 2a and the forming groove 1a, due to the reduced number. It is formed larger than the actual radius of curvature r by the shape portion.

As described above, in the conventional mold apparatus, the thickness of the workpiece 3 and the corner 3c is reduced by the elongation during the molding process, so that the workpiece is not formed to the exact size of the target dimension and the stress is concentrated at the corner where the thickness is reduced. There is a big problem that reduces the strength of.

On the other hand, it is expected that the corner thickness of the workpiece is reduced in the molding process as described above, but sometimes the plate-shaped workpiece is set to a thick thickness before molding, which is a factor that increases the raw material cost used in the workpiece, There is still a problem that is unsuitable for unnecessarily raising the weight of the processed workpiece and producing a workpiece of the exact size desired.

In addition, as shown in FIG. 5, the finished workpiece formed by the conventional mold apparatus is limited to the corner molding of the workpiece. Finally, the finished workpiece is finally cut by performing a cutting operation on the upper end of the molded workpiece. It can be obtained.

Therefore, the present invention is to solve the conventional problems as described above, the object is to minimize the radius of curvature of the corner portion of the workpiece generated during the molding process and to reduce the thickness of the corner portion of the corner forming mold An apparatus and a processing method thereof are provided.

In addition, another object of the present invention is to provide a corner forming mold apparatus and a processing method of the press workpiece to implement a flexible operation in response to the elongation of the workpiece provided in various kinds, such as preheating temperature, material, thickness.

In addition, another object of the present invention may include a cutting process for the workpiece to be completed through the mold apparatus, the corner molding of the press workpiece to reduce the separate post-process for cutting after the molding step using the mold apparatus The present invention provides a mold apparatus and a processing method.

In the present invention for achieving the above problems and to eliminate the conventional drawbacks in the molding process of the press-working product using the punch of the upper mold, and the molding groove of the lower mold formed to correspond to the punch,
A molding preparation step (S1) of operating the driving means to lower and project the lower surface of the movable auxiliary punch disposed at the center of the lower surface of the punch from the lower surface of the punch;

First bending molding for bending the workpiece adhered to the lower surface of the movable auxiliary punch moved into the molding groove by moving the upper mold toward the plate-shaped workpiece placed on the upper surface of the molding groove of the lower mold in a 'V' shape. Step S2;

After the first bending molding step, the second bending molding step (S3) for moving the lower surface of the punch of the continuously moving upper mold into the forming groove and bending the corner of the workpiece in close contact with the lower edge of the punch in an obtuse shape. ;

After the second bending molding step, the step forming surface formed on both walls of the punch of the continuously moving upper mold enters the side wall edge of the forming groove, the cutting molding step (S4) for cutting the workpiece;

After the cutting molding step, the moment when the center lower surface of the workpiece that is in close contact with the movable auxiliary punch by the continuously moving upper mold is in close contact with the bottom surface of the forming groove, the driving means is activated to correspond to the lowering speed of the upper mold. A third bending molding step (S5) of inserting the punch into the lower surface of the punch and bending the corner of the workpiece in close contact with the lower edge of the punch;

After the third bending molding step, the molding completion step (S6) for pressing the workpiece through the lower surface of the movable auxiliary punch, the lower surface of the punch and the step surface of the punch by the continuously moving upper mold;

It is characterized by forming a corner of the workpiece through the processing step consisting of.

From the above means, the present invention utilizes the movable auxiliary punch provided in the punch, and does not process the corners of the workpiece instantaneously with the lowering of the upper mold once, but through a plurality of bending steps, thereby punching and forming By reducing the tensile load of the workpiece supported in the groove, it is possible to minimize the radius of curvature of the workpiece corner and the thickness change.

In addition, the present invention provides a die between the punch and the forming groove by providing equally distributed pressure conditions through the lower surface of the movable auxiliary punch and the lower surface of the punch and the step surface of the punch, rather than a one-time press by the lower surface of the conventional punch. The workpiece can be densely filled in the shape to obtain a workpiece of the exact size desired.

In addition, the present invention utilizes data information such as preheating conditions, materials, and thicknesses of the workpieces, which are set in advance in the control unit for controlling the driving means of the mobility auxiliary punch, and furthermore, flexible corner forming operations are performed for elongation conditions that are variously formed for each workpiece. It has the advantage that it can be done.

In addition, the present invention can simultaneously perform the corner forming process and the cutting process for the unnecessary portion of the work piece at the same time, the post-process that must cut the unnecessary part of the finished work after the molding by the conventional mold apparatus for the main purpose of corner shaping. There is an advantage in that it can be excluded or significantly reduced the work load in such a post process.

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

6 to 14 is a schematic cross-sectional view showing the configuration of the mold apparatus according to an embodiment of the present invention and the molding process of the workpiece.

The mold apparatus according to an embodiment of the present invention includes an upper mold 20 having a punch 21 and a lower mold 10 having a molding groove 11 corresponding to the punch 21. .

That is, the plate-shaped workpiece 3 placed on the lower mold 10 is formed into a workpiece having a '∪' shaped cross-sectional structure by a die-shaped portion formed by the punch 21 and the forming groove 11. .

In the following detailed description of the present invention, the already known technical information regarding the movement and guide means of the upper mold 20 moving toward the lower mold 10, the detailed description thereof will be omitted.

The mold apparatus according to the present invention comprises a movable auxiliary punch 30 in the upper mold 20 having the punch 21.

The mobility auxiliary punch 30 moves toward the lower mold 10 in conjunction with the punch 21 from the movement of the upper mold 20, and the lower surface of the punch 21 by a separate driving means 35. A rise and fall structure is formed so as to emerge from 211. In addition, the lower surface 301 of the movable auxiliary punch 30 is disposed at the center of the lower surface 211 of the punch 21 to maintain a width smaller than the lower surface 211 of the punch 21. The driving means 35 for raising and lowering the movable auxiliary punch 30 may be a driving cylinder operated by hydraulic pressure or pneumatic pressure.

In addition, in the mold apparatus according to the present invention, the punch 21 is formed by including a step surface 25 on both wall surfaces 212 to press both upper ends of the workpiece (3) to form a '∪' cross-section. do.

That is, the upper mold 20 according to the present invention is a workpiece (through the lower surface 301 of the movable auxiliary punch 30, the lower surface 211 of the punch 21 and the step surface 25 of the punch 21 ( 3) is press-molded, the lower mold 10 is to form the remaining portion of the workpiece (3) through the bottom surface 111 and both side walls 112 of the forming groove (11).

Subsequently, the present invention comprises a control unit 40 for controlling the operating pressure of the driving means 35 to adjust the range of raising and lowering of the mobility auxiliary punch 30.

Hereinafter, the molding process and action of the workpiece having a '∪' cross-sectional structure using a plate-shaped workpiece using the mold apparatus of the present invention will be described.

First, the plate-shaped workpiece 3 heated to a predetermined temperature is seated on the lower mold 10.

Subsequently, as shown in FIG. 7, the lower surface 301 of the movable auxiliary punch 30 from the lower surface 211 of the punch 21 by the driving means 35 operated by a predetermined signal from the controller 40. Protrude). (Molding preparation stage (S1))

The protruding range of the movable auxiliary punch 30 is related to the material and thickness of the workpiece 3 as well as the relative area of the lower surface 301 of the movable auxiliary punch 30 to the lower surface 211 of the punch 21. The protruding range must be different, and the control unit 40 sends the setting signal selected from the series of data to the driving means 35.

Thereafter, in the state in which the movable auxiliary punch 30 protrudes, the upper mold 20 is moved toward the lower mold 10, and the actual work of the workpiece 3 is performed.

Figure 8 shows the completion point of the first bending molding step according to the present invention, the mold apparatus of the present invention is to move the auxiliary auxiliary punch 30 into the molding groove 11 in the lower step of the upper mold 20 The first bending molding step S2 is performed first.

In the first bending forming step S2, the lower surface 301 of the movable auxiliary punch 30 primarily presses the upper surface of the workpiece 3 to form the workpiece 3 in an approximately '∨' shape. In the first bending forming step S2, at the moment when the lower surface 301 of the movable auxiliary punch 30 enters the forming groove 11, that is, both lower surfaces 211 of the punch 21 are upper surfaces of the workpiece 3. It lasts until the moment you get close to it.

As shown in FIG. 8 showing the completion point of the first bending molding step S2, the workpiece 3 supported on both bottom surfaces 211 of the punch 21 and the edge of the sidewall 112 of the forming groove 11. Substantially corner forming part of the workpiece 3 is inclined in advance by the movable auxiliary punch 30 into the forming groove 11, the shear by the relative movement by the punch 21 and the forming groove 11 It can reduce the stress burden and reduce the elongation at that corner.

Subsequently, FIG. 9 shows the completion point of the second bending molding step according to the present invention, wherein the second bending molding in which the punch 21 enters into the forming groove 11 from the continued lowering of the upper mold 20 is continued. Step S3 is performed.

'자 형으로 형성하게 되며, 이러한 제2벤딩 성형단계(S3)는 펀치(21)의 양쪽 단차면(25)이 성형홈(11)에 진입하는 순 간, 즉 양족 단차면(25)이 가공물(3)의 상면에 밀착되는 순간까지 지속된다.The second bending molding step (S3) is to implement the primary bending work for the corner portion of the workpiece (3), roughly '

The second bending molding step (S3) is formed at the moment when both stepped surfaces 25 of the punch 21 enter the forming groove 11, that is, the bilateral stepped surfaces 25 are processed. It lasts until the moment in close contact with the upper surface of (3).

Through the second bending molding step S3, the workpiece 3 is first bent to form an obtuse angle prior to completing molding of the corner to be bent, so as to lower the elongation compared to the corner portion formed at one time in the prior art. It is.

10 shows the completion point of the cutting molding step according to the present invention, in which the step surface 25 of the punch 21 enters into the forming groove 11 from the continuous lowering of the upper mold 20. The workpiece cutting molding step S4 is performed.

Preferably, the edge 112a of the side wall 112 of the forming groove 11 maintains the curved shape for cutting molding cutting the upper end of the workpiece 3 so as to enter toward the curved edge 112a. The stepped surface 25 of the punch 21 facilitates the cutting of the workpiece 3 supported on the inclined edge 112a such as scissors. (See FIG. 9).

This cutting molding step (S4) can eliminate the inconvenience of the post-processing for the finished workpiece, the conventional bending molding, as shown in Figure 5 for the process after cutting the end of the finished workpiece again through the conventional mold apparatus The work can be carried out simultaneously in the mold apparatus.

On the other hand, the step surface 25 is formed perpendicular to the downward direction of the punch 21, and serves to press down the workpiece 3 together with the lower surface 211 of the punch 21, That is, as shown in FIG. 11, the workpiece 3 cut through the cutting molding step according to the present invention is supported on the lower surface 301 of the movable auxiliary punch 30 and the step surface 25 of the punch 21. It continues to descend into the molding groove 11. In this process, the workpiece 3 supported by the movable auxiliary punch 30 slides down along the sidewall 112 of the molding groove 11 due to the pressurization of the workpiece 3 by the step surface 25. It is possible to further reduce the elongation of the corner portion of the workpiece (3) forming an obtuse angle at.

Subsequently, FIG. 12 shows the completion point of the third bending molding step according to the present invention. The third bending molding step S5 of elevating the movable auxiliary punch 30 with the continuous lowering of the upper mold 20 is continued. Will be performed.

In other words, the workpiece 3 is in close contact with the bottom surface 111 of the forming groove 11 while the lower side 301 of the movable auxiliary punch 30 is lowered by the pressure of the step surface 25 of the punch 21. At the moment, the driving means 35 receiving the signal of the controller 40 according to the present invention raises the mobility auxiliary punch 30. At this time, the ascending speed of the mobility auxiliary punch 30 is preferably made in proportion to the descending speed of the upper mold 20, for example, the ascending speed of the mobility auxiliary punch 30 faster than the descending speed of the upper mold 20. It is also possible to implement. As described above, the ascending speed of the mobility auxiliary punch 30 is based on the preset criteria of data set in the controller 40 such as initial heating temperature, material, and thickness of the workpiece 3 based on the descending speed of the upper mold. It can be driven differently.

As shown, the workpiece 3 after the third bending molding is completed has a lower surface 301 of the movable auxiliary punch 30, a lower surface 211 of the punch 21, and a step surface 25 of the punch 21. The final '∪' shaped cross-sectional structure will be in close contact with.

Subsequently, as an enlarged view of the main part of FIG. 12 to show the molding completion step according to the present invention of FIG. 13, after the lifting of the movable auxiliary punch 30 by the third bending forming step S5 is completed, the upper mold 20 The molding completion step (S6) is finally performed to complete the lowering of the), as shown, the molding is performed through the third bending molding step (S5), without changing the shape of the actual workpiece (3) The thickness reinforcement is performed on the corner portion of the finished workpiece (3).

That is, between the forming groove 11 and the punch 21 through the lower surface 301 of the movable auxiliary punch 30, the lower surface 211 of the punch 21, and the step surface 25 of the punch 21. By finally pressing the workpiece 3 against the die shape (molding space), as shown in Fig. 4, the corner portion of the workpiece is completely filled in the die shape (molding space), as shown in Fig. 4, so that the radius of curvature increases and the thickness is increased. It is possible to prevent the phenomenon that is reduced.

After completion of the above series of workpiece processing operations, as shown in FIG. 14, the upper mold 20 is lifted to take out the workpiece from the mold.

The mobile auxiliary punch 30 according to an embodiment of the present invention maintains the state protruding toward the workpiece 3 in advance of the initial drop of the upper mold 20, and then the workpiece 3 during the lowering of the upper mold 20 continues. When the) is in close contact with the bottom surface 111 of the forming groove 11, the lower surface 301 is raised to show the process of being in close contact with the workpiece 3 together with the lower surface 211 of the punch 21,

The control unit 40 for controlling the driving means 35 of the movable auxiliary punch 30 according to the present invention includes the first bending molding step S2, the second bending molding step S3, and the cutting molding step S4. It can be configured to include a variable molding step (S7) for changing the projecting position of the movable auxiliary punch 30 for each.

That is, the controller 40 adjusts the operating pressure of the driving means 35 during the continuous lowering of the upper mold 20, so that the degree of protrusion of the movable auxiliary punch 30 from the lower surface 211 of the initial punch 21, namely, The height difference between the lower surface 211 of the punch 21 and the lower surface 301 of the movable auxiliary punch 30 is further lowered or raised from the lower surface 211 of the punch 21. By varying according to the arbitrary, it is to be able to cope with the elongation that varies depending on the characteristics of the workpiece under various conditions such as initial heating temperature, material, thickness.

As described above, the degree of change in the protruding position of the movable auxiliary punch 30 when the upper mold 20 is lowered is, of course, that the construction of a database related to the initial heating temperature, material, thickness, etc. of the workpiece should be prepared first. .

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 to 3 is a schematic cross-sectional view showing the configuration and operation of the conventional mold apparatus

4 is an enlarged view of a portion A of FIG.

5 is an exemplary view showing a workpiece molded through a conventional mold apparatus.

6 to 12 are cross-sectional schematic diagram showing the configuration of the mold apparatus according to the invention and the process of the molding operation

13 is a partially enlarged view of FIG. 12.

Figure 14 is a schematic cross-sectional view showing the final take-out process of the workpiece after molding completed through the mold apparatus according to the present invention

<Description of the symbols for the main parts of the drawings>

(3): Workpiece

(10): lower mold

(11): forming groove

(20): Upper mold

21: Punch

25: stepped surface

(30): Mobility Aid Punch

(35) driving means

40: control unit

Claims (5)

delete delete delete In the molding processing method of the press-formed product using the punch 21 of the upper mold 20 and the forming groove 11 of the lower mold 10 formed to correspond to the punch 21, The driving means 35 is operated to prepare the lower surface 301 of the movable auxiliary punch 30 disposed at the center of the lower surface 211 of the punch 21 from the lower surface 211 of the punch 21. Step S1; The movable auxiliary punch 30 is moved into the molding groove 11 by moving the upper mold 20 toward the plate-shaped workpiece 3 mounted on the upper surface of the molding groove 11 of the lower mold 10. A first bending molding step S2 of bending the workpiece 3 in close contact with the lower surface 301 in a 'V' shape; After the first bending molding step, the lower surface 211 of the punch 21 of the upper mold 20 that is continuously moving moves to the inside of the forming groove 11 and closely adheres to the edge of the lower surface 211 of the punch 21. A second bending molding step (S3) of bending the corners of the workpiece 3 in an obtuse shape; After the second bending molding step, the stepped surfaces 25 formed on both wall surfaces 212 of the punch 21 of the upper mold 20 that are continuously moving are edges 112a of the sidewalls 112 of the forming groove 11. Entering the cutting molding step (S4) for cutting the workpiece (3); After the cutting molding step, the lower surface of the center 3 of the workpiece 3 in close contact with the movable auxiliary punch 30 by the continuously moving upper mold 20 is in close contact with the bottom surface 111 of the forming groove 11, The driving means 35 is operated so that the movable auxiliary punch 30 is inserted into the lower surface of the punch 21 to correspond to the lowering speed of the upper mold 20, and is closely attached to the edge of the lower surface 211 of the punch 21. A third bending molding step S5 of bending the corners of the workpiece 3 in a bent form; After the third bending molding step, the lower surface 301 of the movable auxiliary punch 30, the lower surface 211 of the punch 21, and the punch 21 by the continuously moving upper mold 20. Molding completion step (S6) of pressing the workpiece (3) through the step surface 25 of the; Corner molding processing method of the press work, characterized in that configured to include. 5. The method of claim 4, In any one of the first bending molding step (S2), the second bending molding step (S3) and the cutting molding step (S4), the punch 21 is lowered by adjusting the operating pressure of the drive means (35) And a variable molding step (S7) for changing the projecting position of the lower surface (301) of the movable auxiliary punch (30).

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