KR100807213B1 - Crease prevention forming method and mold structure of foaming mold - Google Patents

Abstract

A crease prevention forming method of a forming mold and a crease prevention mold structure of a forming mold are provided to prevent the formation of creases on the edge of an article after forming, improve forming quality of the article, and perform a forming operation promptly by forming the workpiece while a pad of a top mold is slid out from the workpiece in a state that tensile force is applied to the workpiece when a vertical portion of a workpiece is formed. In a method for injecting a workpiece(1) between a top-insert steel(12) fixed to a top mold(10) and a bottom pad(21) under the top-insert steel to form an article consisting of a top bent part, a vertical part and a bottom bent part, a crease prevention forming method of a forming mold comprises: forming a top pad(11) on a side face of the top-insert steel, the top pad being elastically supported by a spring(13); forming a bottom-insert steel(22) on the bottom mold, the top pad being formed such that a pressure part(11') presses considerable portions of a part of the workpiece to be formed into a top bent part and a part of the workpiece to be formed into a vertical part between the top-insert steel and the bottom-insert steel just before the top-insert steel forms the workpiece by lowering the top mold; lowering the top-insert steel and allowing the top-insert steel to act with the bottom pad to form the vertical part and the bottom bent part on the workpiece, wherein in such a process, the workpiece is formed when the gripped portion is slowly drawn out as fast as the descending speed of the top mold while a portion of the workpiece gripped between the top pad and the bottom-insert steel is slid; and completely separating the gripped portion of the workpiece from the pressure part of the top pad when the forming operation is completed.

Description

Crease prevention forming method and mold structure of foaming mold}

The present invention relates to a rapid molding method and a mold structure thereby removing the molded product while preventing the occurrence of wrinkles, and more specifically, to a flat plate during the forming operation using the forming mold The shape of the product made by molding is composed of an upper bent portion (a portion formed in a horizontal or near horizontal shape at the top), and a vertical portion (vertical or close to vertical shape) bent downward from an upper bent portion. The vertical part is formed in a planar (viewed from above) round shape and the height of the vertical part is considerably high, so that wrinkles do not occur at both edges of the vertical part. To make it possible to remove the molded product immediately at the same time as the upper mold rises to be.

As is well known, in order to form a plate-shaped metal material into a three-dimensional shape, drawing or forming is required. The drawing process is to mold while stretching one part while completely fixing one part of the material with a strong force. It is one of the molding methods that can prevent the material from being folded or wrinkled even when molding a complicated shape.

However, the drawback of such a drawing process is that the pressing portion for fixing must be separately configured and removed after molding, and the production cost due to waste of materials is unnecessarily increased.

In order to solve the problem of waste of the material, it is necessary to mold using a forming mold, and one of the problems occurring in the material when processing by using the forming apparatus is that the bent part and the vertical part are simultaneously molded in the product to be molded. If the height is considerably high and there are many three-dimensional shapes such that the vertical part is round, the center part of the vertical part that is round during the forming process becomes thinner, and the wrinkles are caused by the pushed flesh on both edges.

Due to this problem, when forming a product having the above-described characteristics as a forming mold, much attention must be paid to the design and processing of the mold, which takes a lot of time, and a problem in which defects frequently occur during the molding operation is required. It was.

Another problem is to use the forming mold to solve the above problems, while pressing the material by forming a pad of the same shape as the drawing mold on the upper mold, until the upper mold is completely raised after the molding is completed Since the upper pad is holding down the molded product, it takes a long time to remove the product after molding, which leads to a problem of low productivity.

The present invention devised in view of the above problems is configured to press one side of the material by forming a pad to hold the one end of the material in the upper mold when forming the product by using a forming mold, while the vertical portion is molded It prevents the occurrence of wrinkles on the edge of the product after molding by slipping out of the state with the tensile force applied to the material, and when the sliding of the material is completed, the end of the material completely exits the upper pad. It is intended to enable the molding work quickly while improving the quality of the molding by improving the quality of the molding by improving the quality of the molded material immediately after the molding is completed, even if such an upper pad is acting.

The present invention is to mold the material by pressing the one side portion of the material to be the upper-bending portion before the molding starts, and during molding, the pressed portion of the material is slipped off while gradually forming the molding by sliding In order to prevent the occurrence of wrinkles at both edges of the vertical part, and to improve the configuration so that the upper bent part completely leaves the pad in the state where the molding is completed, the lower pad can be raised and the molded product can be demoulded immediately after molding. It is characterized by.

According to the present invention by forming the upper pad to the upper mold is gradually pulled while pressing a portion of the material while forming the material is applied to the friction while pulling at a uniform tension in any position of the vertical portion forming a circle, thereby forming a forming mold One of the important problems is that the occurrence of wrinkles at the edges of the vertical portion is prevented as if using a drawing mold, and it is possible to form a mold without the pressing part of the material required for the drawing mold.

In addition, the upper pad presses the material during molding, but at the moment of completion of molding, the end of the material (product) is out of the upper pad so that the material is separated from the lower pad at the same time as the upper mold is raised. It is said that there is an advantage such that the removal is quick, and it is a useful invention to satisfy the quality and productivity of the forming mold at the same time.

Hereinafter, the embodiment of a specific molding method and a mold structure according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an example of a product produced by the present invention,

2 is a cross-sectional view of a mold according to the present invention;

Figure 3a to 3e is a cross-sectional view showing a step by step the process of forming according to the present invention,

4 is an enlarged view of the state of FIG. 3D where the molding of the product is completed by the present invention.

First, the method according to the invention will be described.

The upper bent part is composed of the upper mold 10 and the lower mold 20 and the material 1 is inserted between the upper-insert steel 12 fixed to the upper mold 10 and the lower pad 21 thereunder. In molding the product 1 'consisting of (3) and the vertical portion (2) and the lower bent portion (4),

The upper pad 11 which is supported by the spring 13 on the side of the upper insert steel 12 and the lower mold 20 below the lower insert steel 22 is configured, but the upper pad ( 11, the upper portion 10 is lowered so that the pressing portion 11 'with the lower insert steel 22 immediately before the upper-insert steel 12 forms the material 1; It is configured to press a substantial portion of the portion to be the upper bent portion (3) and the vertical portion (2) of,

Then, the upper insert steel 12 is lowered to form the vertical portion 2 and the lower bent portion 4 by the action with the lower pad 21. In this process, the upper pad 11 and the lower insert of the material 1 are formed. Molding is performed while the bite portion between the steel 22 slips and slips slowly, and when the molding is completed, the bite portion of the material 1 completely escapes the pressing portion 11 'of the upper pad 11 (in the drawing). 'T') is characterized in that the molding.

Therefore, when the upper mold 10 starts to rise after the molding is completed, the upper pad 11 is pushed up the molded product while the lower pad 21 is raised even though the upper pad 11 is kept compressed for a predetermined time. It is.

As the bite between the upper pad 11 and the lower insert steel 22 of the raw material 1 slides, the molding is gradually carried out as the upper mold 10 descends and the spring 13 and 23 are formed. It is possible to control the friction force between the upper-insert steel 12 and the lower pad 21 and the friction force between the upper pad 11 and the lower insert steel 22 by adjusting the elastic force of the upper-insert steel 12. This is possible by making the elastic force of the spring 23 causing friction between the lower pad 21 and the lower pad 21 slightly higher than the tension of the spring 13 causing friction between the upper pad 11 and the lower insert steel 22.

Hereinafter, a detailed configuration embodiment of the mold according to the present invention.

The mold of the present invention consists of an upper mold 10 and a lower mold 20 as in a conventional forming mold.

The upper mold 10 has an upper pad 11 configured to protrude downward due to the spring 13, and a pressing part 11 'for pressing a part of the material 1 directly on the lower side of the upper pad 11. By this configuration, the pressing portion 11 'is configured to press one side of the material 1 until the molding is completed until the molding operation is completed.

The pressing portion 11 ′ is required to have a surface treatment for strengthening the surface hardness on the bottom surface friction with the material (1).

The pressing portion 11 'of the upper pad 11 is configured to abut on a portion of the upper surface of the lower insert steel 22 fixed to the lower mold 20, and the lower surface and the lower insert of the pressing portion 11'. The upper surface of the steel 22 is configured to have the same angle and shape as that of the upper bent portion 3 in the state in which the material 1 is molded into the product 1 ', and the lower insert steel 22 The upper surface of is configured to protrude longer than the bottom of the pressing portion (11 ') toward the vertical portion (2) of the product.

The portion of the lower insert steel 22 which is not rubbed with the pressing portion 11 ′ and the side of the lower insert steel 22 are fixed to the upper mold 10 to the side of the upper insert steel 12. The shape and the shape of the upper bending portion 3 and the vertical portion (2) of the product (1 ') was to be molded.

Next to the lower insert steel 22, the lower pad 21 is formed on the lower mold 20 while being supported by the spring 23 so that the lower pad 21 is raised before the molding operation. The lower bent portion (4) of the bottom portion is seated while being pressed by the upper-insert steel (12) while being seated (compressing the spring), and the lower pad (21) and the lower pad (21) of the upper-insert steel (12). The upper surface of was configured to have the same shape and angle as the angle and shape of the lower bent portion 4 of the molded product 1 '.

The lower pad 21 is raised immediately by the force of the spring 23 when the upper mold 10 is raised after the molding operation is completed, such as the lower pad 21 of the known mold is raised until the next molding operation is made State is maintained.

The molded product is released from the lower pad 21 by this synergy and is quickly demolded.

Reference numerals 14 and 24 which are not described in the drawings are guide pins.

The operation of the mold apparatus according to the present invention having such a configuration will be described in detail.

Before starting the molding operation, the material 1 is seated between the upper mold 10 and the lower mold 20, and the lower pad 21 is elastically provided by the spring 23 to be directly below the material 1. The protruded state, and the upper pad 11 is protruded downward by the spring (13). (See Figure 3a)

When the operation starts, the upper mold 10 descends and the upper insert steel 12 simultaneously with the pressing portion 11 'of the upper pad 11 begins to press the material 1, and the lower surface of the material 1 It is supported by a lower insert steel 22 fixed to the lower mold 20. (See Figure 3b)

As described above, the upper mold 10 is gradually lowered while the one side of the material 1 is bitten between the upper pressing part 11 ′ and the lower insert steel 22 to form the material 1. The top-insert steel 12 of the upper mold 10 and the lower pad 21 of the lower mold 20 are pressed into the required shape while pressing the raw material 1 (see FIGS. 3C and 3D).

That is, the vertical portion 2 is formed in the middle part of the material by the side shape of the lower insert steel 22 and the side shape of the upper insert steel 12, and the bottom and the bottom of the upper insert steel 12 are formed. The part of the material corresponding to the upper surface of the panel becomes the lower bent portion 4 of the product, and between the pressing portion 11 'of the upper pad 11 and the lower insert steel 22 of the lower mold 20. The bite portion becomes the upper bent portion (3), especially the portion that becomes the upper bent portion (3) at the beginning, a fairly wide surface of the material (1) is the pressing portion 11 'and the lower mold of the upper pad 11 The bite is inserted between the lower insert steel 22 of 20, and the bite of the material 1 slips out while the remaining vertical portion 2 is formed.

At the time when the molding is completed (FIGS. 3D and 4), the portion that becomes the upper bent portion 3 of the raw material 1 completely satisfies the pressing portion 11 ′ of the upper pad 11 by the 'T' portion of the drawing. After being removed, the upper bent portion 3 is formed between the upper end of the lower insert steel 22 and the lower end of the upper insert steel 12.

When the molding is completed, the rise of the upper mold 10 starts, the pressing portion 11 'of the upper pad 11 is still in close contact with the lower insert steel 22 by the force of the spring 13 The lower pad 21 maintains the state of close contact with the upper insert steel 12 due to the pressing force of the spring 23 as the upper insert steel 12 rises, so that the upper insert steel 12 rises. Therefore, it rises.

As a result of the upward movement of the lower pad 21, the molded product 1 ′ starts to be phased, even though the pressing part 11 ′ of one side is kept in close contact with the lower insert steel 22. Since the upper bent part 3 is out of the pressing part 11 ', the product 1' is demolished quickly without a problem that the product 1 'rises. (See Figure 3e)

When the molded product 1 'is removed and the rise of the upper mold 10 is completed, the pressing part 11' is spaced apart from the lower insert steel 22 to return to the original ready state (FIG. 3A).

1 is a perspective view showing an example of a product produced by the present invention

Figure 2 is a cross-sectional view of the mold according to the present invention

Figure 3a to 3e is a cross-sectional view showing step by step the process of forming according to the present invention

Figure 4 is an enlarged view of the main part of Figure 3d completed the molding of the product by the present invention

*** Explanation of symbols for main parts of drawing ***

1: Material 1 ': Product

2: vertical portion 3: upper bent portion

4: lower bend

10: upper mold 11: upper pad

11 ': compression portion 12: upper-insert steel

13: spring

20: lower mold 21: lower pad

22: lower insert steel 23: spring

Claims (2)

The upper bent part is composed of the upper mold 10 and the lower mold 20 and the material 1 is inserted between the upper-insert steel 12 fixed to the upper mold 10 and the lower pad 21 thereunder. In molding the product 1 'consisting of (3) and the vertical portion (2) and the lower bent portion (4), Configure the upper pad 11 carried by the spring 13 on the side of the upper-insert steel 12, The lower mold 20 has a lower insert steel 22, but the upper pad 11 has the upper mold 10 lowered so that the upper insert steel 12 forms the material 1. Immediately before the pressing portion 11 'is configured to press a significant portion of the portion to be the upper bent portion 3 and the vertical portion 2 of the material 1 between the lower insert steel 22. and, Then, the upper insert steel 12 is lowered to form the vertical portion 2 and the lower bent portion 4 by the action with the lower pad 21. In this process, the upper pad 11 and the lower insert of the material 1 are formed. As the bite is slipped between the steel 22 and the upper mold 10 descends at a slow speed, the molding is performed. When the molding is completed, forming the mold to prevent wrinkles, characterized in that the bite of the material (1) is formed so as to completely leave the pressing portion (11 ') of the upper pad (11). Consisting of the upper mold 10 and the lower mold 20, the lower mold 20 is supported on the spring 23 to configure the lower mold 20 to form a lower pad 21 that is raised before the molding operation In the mold, The upper mold 10 is supported by a spring 13 to constitute an upper pad 11 protruding downward, The lower end side of the upper pad 11 is configured to press the pressing portion (11 ') so as to press directly on one side of the material (1) from before the molding operation is completed, The pressing portion 11 ′ of the upper pad 11 is configured to be in contact with a portion of the upper surface of the lower insert steel 22 fixed to the lower mold 20. The bottom surface of the pressing portion 11 'and the upper surface of the lower insert steel 22 are configured to have the same angle and shape as the angle and shape of the upper bent portion 3 of the product 1' to be molded, The upper surface of the lower insert steel 22 is configured to protrude longer toward the vertical portion 2 of the product than the lower surface of the pressing portion 11 ', The portion of the lower insert steel 22 which is not rubbed with the pressing portion 11 ′ and the side of the lower insert steel 22 are fixed to the upper mold 10 to the side of the upper insert steel 12. And shape to match the shape of the upper bending portion 3 and the vertical portion (2) of the product (1 '), The lower surface of the upper insert steel 12 and the upper surface of the lower pad 21 are configured to have the same shape and angle as the angle and shape of the lower bent portion 4 of the molded product 1 '. Anti-wrinkle mold structure of forming mold.

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