KR20020030562A - Deep drawing method - Google Patents

Abstract

PURPOSE: A method of deep drawing magnesium material that has superior in environmental compatibility and energy saving properties is provided. This method has advantages in that it can be applied not only to a general press working of hard metals such as magnesium, but also to deep draw forming of hard metals without using a large-scale instrument. CONSTITUTION: The deep drawing method uses a die having a male mold(1) with a convex portion, and a female mold having a concave surface. In the method of the invention, a mounting table(3) is placed between the male mold and the female mold for supporting a magnesium plate(5), and a layer of a plurality of thin resin films is placed on the magnesium plate. Further, a central portion of the magnesium plate(5) is kept in contact with the convex portion of the male mold, and the concave surface of the female mold is moved to cooperate with the convex portion of the male mold so that deep draw forming of the magnesium plate is achieved.

Description

Deep drawing molding processing method {DEEP DRAWING METHOD}

The present invention relates to a process for deep drawing forming for special hard metal materials such as magnesium materials.

Various kinds of plastic products have been widely distributed, and as a result, a large amount of plastic waste and garbage has been generated or discarded. Plastic wastes have been incinerated with combustible wastes, but eventually lead to serious problems of air pollution and other environmental issues. Moreover, although plastic products are collected for recycling purposes, they require a high cost for recycling and have a disadvantage of inadequate resin when recycled into new products, and therefore the collection rate of plastic products is extremely low.

The use of magnesium materials has been supported as an alternative or alternative to plastic materials, and castings on magnesium materials have been proposed. However, cast products of magnesium material are subject to some limitations in the form of the product. In addition, if deep drawing was performed by a press operation, the products would be cracked, so it was difficult to make a successful press operation.

Attempts have been made to overcome the problems as described above by using a press work die heated at about 250 ° C. with a suitable electric heater. However, there is a disadvantage that the die must be heated each time the operation of the press operation is performed, which in turn leads to a serious defect in the working efficiency. In addition, as the magnesium plate is repeatedly provided in the press operation, the magnesium plate becomes harder and harder to proceed by deep drawing, and furthermore, a serious problem occurs in which the surface of the molded product is cracked and cracked. .

It is an object of the present invention to provide a new deep drawing method for application to magnesium plates.

It is yet another object of the present invention to provide a new deep drawing forming process for magnesium plates having the lightest and best recycling properties, environmental compatibility and energy saving properties in metals for structural purposes.

According to one aspect of the invention, there is provided a deep drawing molding processing method using a die having a male mold having a convex molding surface and a female mold having a concave molding surface:

Vertically placing the mounting table to place it on the magnesium plate between the male mold and the female mold,

Placing a plurality of resin films on the magnesium plate,

Maintaining a central portion of the magnesium plate in contact with the convex forming surface of the male mold and inserting the concave forming surface of the female mold into the convex forming surface of the male mold to achieve deep drawing molding.

In the deep drawing molding processing method according to the present invention, the layer of resin thin films constitutes at least two vinyl films having a thickness of 0.02 mm. In addition, the magnesium plate preferably has a thickness of about 1.5 mm.

In the deep drawing forming processing method according to the present invention, pressure is added to the magnesium plate by a base plate moving to the upper surface of the concave forming surface of the female mold, for example, mounting by an inching device such as a hydraulic cylinder. The vertical movement of the table is adjusted.

In addition, in the deep drawing forming processing method of the present invention, the female mold has four arm elements that are L-shaped in cross section and fit to the lower surface of the base plate, and each of the four arm elements is molded (ie, a second molding). A concave forming surface on the upper side of each inner corner surface for the purpose of) and an outwardly expanding guide surface extending continuously to the lower side of the concave forming surface for the molding purpose.

Further, in the present invention, the arm mold has four arm elements that are L-shaped in cross section, and each inner corner surface has a concave forming surface. Each of the arm elements moves radially to fit the lower surface of the base plate to which the elastic means are attached, and each arm element moves radially within the predetermined range. In addition, respective support members located between adjacent arm elements are fixed to the lower surface of the base plate to limit the recovery position of the arm element, and the arm element is elastic means for pressing the arm element that is radially widely pushed by the male element. The spring force will restore the original position.

The shrinkage restricting plate is fitted to the male mold or the female mold.

In the present invention described above, for the purpose of molding on the lower side of the female mold prior to production by the female mold for pre-pressing or molding (ie the first molding) by the arm mold (ie the second molding) It is carried out by the outwardly extending guide concave surface, and then finishing is performed by the concave forming surface for the second forming purpose, so that excessive force is not applied at one time or intensively to the curved surface of the mold. In addition, two or three vinyl films, each having a thickness of 0.02 mm, are treated between the magnesium plate and the arm guide surface (ie, the guide concave surface and the concave forming surface of the arm guide surface), and thus the die (or mold) and No shrinkage or shrinkage occurs between the magnesium plates, and smooth folding manufacturing is done without any problems. Further, the molding processing method of the present invention includes: placing a shrinkage limiting plate having a hole for receiving a male mold inserted therein between the male mold and the female mold, and shrinking the upper surface of the cantilever plate so as to lie in the same plane of the female mold. Placing the cantilever plate vertically away from the female mold in the lower part of the restriction plate, providing a connecting bar such that the cantilever plate is treated at the upper end of the connecting bar, providing a support base for fixing the lower end of the connecting bar. And providing a resilient support member for supporting the support base, and inserting the male mold into the female mold while the peripheral end of the magnesium plate is received by the shrink restricting plate. The shrinkage restricting plate is adapted to male mold or female mold.

In addition, in the molding processing method of the present invention, the shrinkage limiting plate is attached vertically to the base plate relative to the male mold, and spring means are provided to bias the shrinkage limiting plate downward. If necessary, the female mold is fitted to its upper surface by the fixing member.

Further, the molding processing method of the present invention includes: diagonal lines of circular grooves at each corner of the die having a rectangular shape in plan view; Intersections (c, f) at both sides of the opposite end of the circular groove and at both sides of the die corner; And intersection points g, h, i, and proportional to the arcs b1 and b2 in contact with the inner angle formed by the flat surface portion k on both sides of the middle and intersection points c, f of the circular groove line; j), the five points (g, h, k, i, and j) are connected together by a continuous curved surface to form a die for the male mold and the female mold.

In the molding process described above, several contact portions, i.e., a concentration of five forces, are provided at a corner or curved surface portion to diffuse or disperse the concentration of the force at five intersections so that the concentrated force is dispersed. Therefore, the concentration of force is distributed to five or more points by the press work so as to effectively prevent shrinkage or generation of gold in the curved portion.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the arm mold and mounting table used for the deep drawing shaping | molding method which concerns on 1st Example of this invention.

2 is a front view of the male mold that is the first die.

3 is a front view of the female mold which is the second die.

4 is a bottom view of the arm mold.

5 is an explanatory view of the female mold viewed from the bottom.

6 is a front view of the male mold and shrinkage limiting plate used in the deep drawing forming processing method according to the second embodiment of the present invention.

7 is a partial view of an arm mold in which magnesium is located.

8 is a partial view of a male mold and a female mold for performing the deep drawing molding processing method of the present invention.

9 is a front view of a second male mold according to a second embodiment of the present invention.

10 is a partial view of a second arm mold according to the second embodiment of the present invention.

It is explanatory drawing of the 2nd male mold and the 2nd female mold which show the progress conditions of deep drawing which concerns on this invention.

12 is a perspective view of a product produced by a molding operation by providing three points for concentration of force on the curved surface of the magnesium plate.

FIG. 13 is an explanatory and enlarged view of a corner portion shown in FIG. 12.

14 is a perspective view of a product produced by a press operation by providing five points for concentration of force in the corner portion of the magnesium plate.

FIG. 15 is an explanatory diagram showing five points at a corner of the product shown in FIG. 14.

16 is a bottom view of the male mold with five intersections in the corner viewed from the lower part.

17 is a plan view of the arm molar with five intersections at the corner of the product.

(Explanation of symbols for the main parts of the drawing)

1: Male mold 17: Arc surface

2: arm mold 21, 31: base plate

3: mounting table 21a: female mold element

4: hole part 22: concave surface

5: magnesium plate 23: guide recess

6: Resin thin film 33: elastic means

7: First person device 35, 37, 43: Support member

11: Male base 40: Male mold

12: convex surface 42: insertion hole

15: Flat top surface 44: Shrink limiting plate

16: vertical side surface 45: spring

A first embodiment of the present invention will next be described with reference to the accompanying drawings. 1 here shows a substantially rectangular shape for insertion through the male mold 1, the vertically movable plate to be molded, ie the magnesium plate s, and the convex portion 12 of the mold 1 which will soon be described. The relationship between the mounting table 3 which has the hole part 4 in the center part of a mounting table is shown.

A magnesium plate 5 is placed on the mounting table 3 to cover the hole portion 4 of the mounting table 3, on which a number of preferences, such as styrene, vinyl, etc., each having a thickness of 0.02 mm. Preferably, two or three resin thin films 6 overlap or are treated in an overlapping relationship. As described above, by providing two or three resin thin films, the respective resin films are free to move or slide in proportion to each other, thus, the female mold 2 and the male mold to provide a predetermined finished surface. The occurrence of shrinkage or shrinkage proportional to the magnesium plate located between the convex portions 12 of (1) can be prevented.

The upper surface of the male base 11 in which some type of convex portion (ie, convex forming surface) is treated under the male mold 1 such that the convex portion 12 faces a female mold which will be described soon. Is installed on. An inching device 7 composed of a hydraulic cylinder or the like is attached to both sides of each of the male base 11 and the mounting plate 3 so that the vertical movement of the mounting plate 3 is adjusted.

As shown in FIG. 2, the convex portion 12 of the male mold 1 is positioned between the flat upper surface 15, the vertical side surface 16, and the two surfaces 15 and 16 to connect the arc surface. (17), the arc surface 17 is configured in an incomplete arc shape by cutting one end positioned adjacent to the vertical site surface 16. As shown in FIG.

3 and 4 showing the female mold 2, four female mold elements 21a are installed in the lower surface corner of the base plate 21 having a substantially rectangular shape similar to the male mold 1, The female mold element 21a is L-shaped in cross section. On the upper side of each inner surface of the female mold element 21a, a concave surface portion 22 (concave forming surface) is installed on each arc surface for finishing purposes or for a second production, so that the concave surface portion is pre-determined. Extends perpendicular to the distance "n". It is preferably shaped to extend into the middle portion of the female mold element 21a.

On the lower side (i.e. at the lowest part) of each inner surface of the female mold element 21a, on the guide recess 23 where the arc shaped surface extends downward in the form of a fan for assembly or main manufacturing purposes. Stretched outwardly relative to each other. In other words, the female mold element 21a has a concave surface portion 22 for finishing or a second manufacture on the upper portion and a guide concave portion 23 that is expanded outward for the first manufacture on the lower portion.

In FIG. 5, which shows the female mold 30 in the second embodiment of the invention, the female mold 30 is moved radially from the center to fit the lower surface of the base plate 31. In other words, the female mold 30 is composed of four female mold components 30a in a manner in which each female mold element is fitted to the lower surface of the base plate 31, and each female mold component 30a is in contact with each other. It has a concave shaping surface 22a on each inner surface so as to be in a facing relationship and movable in a radial direction within a predetermined range.

In the arm mold component 30a, elastic means 33, such as a spring, rubber, or the like, are attached, and the supporting member 37 is fixed to the lower surface of the base plate 31 to restrict the position of each female mold component. In order to be located between the female mold components 30a, and each female mold component is returned to its original position.

One end of the resilient means 33 is engaged with each female mold component 30a, the other end of which is L-shaped and located outside of the female mold component and fixed to the lower surface of the base plate 31. Meshes with the interior of the member 35. The elastic means 33 is pushed against the convex surface portion of the male mold 1 so that the elastic means 33 is contracted radially as shown by the arrow in FIG. 5 so that the elastic means 33 is compressed to generate a spring-bias force for recovery. Done.

Thus, when the pushing force is released or in other words, when the concave forming surface 22a of the female mold 30 is released from the convex surface portion 12 of the male mold 1, the female mold component 30a Will return to its original position. In this case, the support member 37 serves to restrict the female mold component 30a such that the female mold component 30a stops at the same position by moving radially into or toward the center.

In the embodiment of the invention described above, the female mold 2 or 30 is placed in the upper portion of the male mold 1 and the magnesium plate 5 is the convex surface portion 12 of the male mold 1. And the concave surface portion 22 of the female mold. On the upper surface of the magnesium plate 5, a plurality of (preferably two or three) resin thin films 6, such as vinyl films or the like, of about 0.02 mm in thickness are superimposed, and each superimposed thin film 6 is independent. And from the adjacent adjacent films 6, thus preventing the occurrence of shrinkage or shrinkage between the die and the magnesium plate to achieve a desired finish.

The mounting table 3 is processed vertically on the convex surface portion 12 of the male mold 1 for placing on the magnesium plate 5, and the inching device 7 having a hydraulic cylinder or the like is mounted on the mounting table 3. It is installed at both ends. In this state, the concave surface portion 22 of the female mold shown in FIG. 3 is placed on the mounting table 3 with the convex surface portion 12 facing, and the base plate 21 of the female mold presses. Is pressed downward to initiate the operation of the.

The convex surface portion 12 projects through the hole 4 at the center of the mounting table 3 until the convex surface portion 12 contacts the lower surface of the magnesium plate 5 through the resin film 6. Further protrusion or lowering of the female mold 2 presses the peripheral portion of the magnesium plate 5 by means of the female mold 2 with the concave surface portion 22 to achieve a prearranged deep drawing molding.

Although the convex surface portion 12 is initially pressed directly facing the concave surface portion 22, firstly, the first pre-diff drawing is the concave surface portion 22 of the inner angular surface of the female mold component 21a. It should be noted that it is done by the guide concave portion 23 processed on the lower side of the. In this case, there is a small gap between the convex surface portion 12 and the guide concave portion 23. In the next step, a second or finish preparation is carried out by the concave surface portion 22 which is continuously processed on the upper portion of the guide concave portion 23 which is gradually decreasing in diameter.

In the case of the steps described above, when the concave surface portion 22 and the magnesium plate 5 come into direct contact with each other, flaws and gold are generated on the surface of the magnesium plate 5 and excessive force is added to the same surface. It is likely to be, so it is quite difficult to provide a predetermined finish on the curved surface of the product. However, in the embodiment of the present invention described above, the supply of the resin thin film 6 serves to provide a predetermined sliding effect between the guide concave portion 23, the concave surface portion 22 and the magnesium plate 5. Do it. Thus, unnecessary and indiscriminate forces are not locally added to the curved surface of the magnesium plate 5. Therefore, no shrinkage occurs on the surface of the magnesium plate 5, and the occurrence of gold and cracks is effectively prevented. Thus, the desired finish of the surface of the press-worked product is obtained without any cracks or flaws.

The operation of the second arm mold 30 will now be described. When the female mold 30 shown in FIG. 5 is placed on the mounting table 3 on the male mold shown in FIG. 1, that is, the male mold 1 is located at the center of the four female mold components 30a. When inserted into mold C, by means of the four female mold components 30a constituting female mold C, deep drawing is done at the peripheral portion of the magnesium plate to be molded.

Reduction of the arm mold component 30a in the direction shown by the arrow serves to reduce the concentrated load or load to the corner of the deep drawing portion and to achieve smooth manufacture of the deep drawing portion. In this case, since two or three resin thin films 6, such as a vinyl film, are treated between the magnesium plate 5 and the concave forming surface, a desirable sliding effect between the magnesium plate 5 and the female mold 30 is achieved. You can get it.

A third embodiment of the present invention will be described with reference to FIG. In Fig. 6, the male mold 40 in the form of a rectangle is fitted in the center portion of the lower surface of the rectangular plate 41 of a larger size than the male mold 40 while facing downward. The plate 41 has an insertion hole 42 extending in the vertical direction at its four corners, and a support member 43 inserted and moved vertically in the insertion hole 42. A shrinkage restricting plate 44 of a larger size than the male mold 40 is fixed to the lower end of the support member 43 at four corners, and the spring 45 is the shrinkage limiting plate 44 and the plate 41. It is attached to the support member 43 in between. The shrinkage restricting plate 44 has a hole 46 in its central portion for insertion through the mold 40.

With reference to FIG. 7, at the lower end of each support member 43, the female mold 50 in pairs with the male mold 40 has a female mold portion 51 at its central portion and a weighing plate 53. It is located in the upper middle part of. The metering plate 53 fits into the upper portion of the base 55 (of substantially the same size) and has a space portion 54 in the base 55. A plurality of resilient support members 56 treated in a posture perpendicular to the space portion 54 fits the support member 57 at the upper end, and a plurality of connecting rods 58 are the upper surface of the support base 57. It extends through the guide hole 59 so as to be connected to the lower surface of the cantilever plate 60 which is positioned in the vertical direction and moves vertically in the female mold component 51. Usually, the support base 57 is raised upward by the elasticity of the resilient support member 56, the cantilever plate 60 is fitted to the upper end of the connecting rod 58 is installed of the cantilever plate 60 The upper surface is positioned as the upper surface of the female mold 50 on the same plane.

If desired, the shrinkage restricting plate 44 shown in FIG. 6 is secured from the plate 41 to fit the upper surface of the female mold 50 by means of a fixing device 62, such as a bolt, as shown in FIG. Can be separated. In other words, the peripheral portion of the magnesium plate 5 is held and fixed by the shrinkage limiting plate 44 as shown in FIG. 8, and as shown in FIG. 10, the peripheral portion of the shrinkage limiting plate 44 is armed. The male mold 40 is secured to the upper surface of the mold 50 and the fixing device 62 while the male mold 40 is in the female mold portion 51 in the female mold 50 to proceed with the press operation as shown in FIGS. 8 and 11. Is inserted into

In this case, the lower surface of the magnesium plate 5 comes into contact with the cantilever plate 60, so that the male mold 40 is raised upward after the press operation is completed, so that the pressed product 5a ) Will be raised upward at the same time by the elasticity of the elastic support member 56, the product 51a will come out of the female mold (50). Although the resin thin film 5 is not shown in Figs. 8 and 11, it should be expected that a predetermined number of resin thin films, such as two or three films, are provided.

As shown in Figs. 12 and 13, in the conventional method of the deep drawing forming processing method by the conventional press operation, the arc B and the right-angled corner portion A inscribed in the corner portion A are shown. Force is concentrated in a relatively small number of positions, such as two positions (G and H) between the extending flat side surfaces (G and H) and three positions of the peripheral surface portion (D) between the intersections (G and H). do. This eventually led to cracking, especially if the material was hard or hard. Therefore, the press operation proved to be practically difficult to mass produce due to the substantial decrease in yield. Therefore, it is very difficult to position the arc B closer to the corner A.

In view of the above-mentioned difficulties in the prior art, a round groove line is provided in the present invention and the round groove line s is proportional to the right-angled or mutually perpendicular side lines e and f forming a right-angled corner. Oblique, and the intersections c and d are provided between the round groove line s and the side lines e and f. In addition, the inner angles between the round groove line and the side line are connected by two arcs b1 and b2 as shown in FIG. 15. In addition, the intersection points g and h and the intersection points i and j are formed between the two side lines e and f and the arcs b1 and b2, and furthermore, the flat portion k has a round groove line s and the intersection point. It is formed between (h, i) and between arcs b1 and b2.

As described above, more corner portions, such as five points (g, h, k, i, and j), more than three points in the prior art, are shaped to distribute the force to five points. Thus, because there are five points where the force is distributed such that the force added to each point is dispersed, a predetermined curved surface is shaped like a magnesium plate 5 without the occurrence of gold and cracks on the curved surface of the hard material.

The angles cd and fdc form side surface portions e, f and round so that a smooth curved surface is formed and the radius r of the arcs b1 and b2 is determined by the product to be produced by the press operation. The combination of the groove lines s determines the curvature of the curved surface R of the arcs b1 and b2 in contact with the formed internal angle.

On the corner surface of the male mold 40 of the male mold 40 and the corner surface of the female mold component of the inner surface portion of the female mold 50 shown in FIG. 16, the flat surface portion is such that the number of contact portions increases from three to five. meet with (k) Thus, in order to prevent the occurrence of cracks or cracks in the curved surface portion, the concentration of the force is distributed to five points so that the force is not concentrated locally. Thus, the molded male mold is shown in FIG. In Figure 16, five and equal corner portions are provided to distribute the force to these five points, and similarly, the female mold is shown in Figure 17 for the same purpose.

Although the present invention has been described with reference to examples of using magnesium plates as a molded material, it should be understood that the present invention is also applicable to other hard metals that exhibit some difficulty in molding. In addition, the present invention is also applied to soft metals generally known for general press operations in order to form into certain shapes.

The molding molding process according to the present invention offers the advantage of being applied to deep drawing molding using hard metals such as magnesium plates, as well as general press operations, without the use of large-scale instruments.

Claims (10)

As a deep drawing molding processing method using a die having a male mold having a convex forming surface and a female mold having a concave forming surface: Vertically placing the mounting table to place it on the magnesium plate between the male mold and the female mold, Placing a plurality of resin films on the magnesium plate, Maintaining a central portion of the magnesium plate in contact with the convex forming surface of the male mold and inserting the concave forming surface of the female mold into the convex forming surface of the male mold to achieve deep drawing molding. Processing method. The deep drawing molding method according to claim 1, wherein the layer of resin thin films constitutes at least two vinyl films having a thickness of 0.02 mm. The pressure is added to the magnesium plate by a base plate moved to the upper surface of the concave forming surface of the female mold, and the vertical movement of the mounting table is adjusted by an inching device such as a hydraulic cylinder. Deep drawing molding processing method characterized in that. 2. The arm mold according to claim 1, wherein the arm mold has four arm elements that are L-shaped in cross section and fit to the lower surface of the base plate, each of the four arm components each having an inner corner surface for shaping (i.e., second molding) purposes. And a concave forming surface on the upper side of the concave forming surface, and an outwardly expanding guide surface extending continuously to the lower side of the concave forming surface for molding purposes. 2. The arm mold according to claim 1, wherein the arm mold has four arm elements that are L-shaped in cross section, each inner corner surface has a concave forming surface and each of the arm components is adapted to the lower surface of the base plate to which the elastic means is attached. Move radially, each arm element moves radially within the predetermined range, and each support member located between adjacent arm elements is fixed to the lower surface of the base plate to limit the recovery position of the arm element. And the female element is restored to its original position by the spring force of the resilient means to squeeze the female element radially widely pushed by the water component. Laying a shrinkage restricting plate having a hole for receiving a male mold inserted therein between the male mold and the female mold, wherein the cantilever plate is armed at the lower portion of the shrinkage restricting plate so that the upper surface of the cantilever plate lies in the same plane of the female mold. Placing it vertically in the mold, Providing a connecting rod such that the cantilever plate is treated at the upper end of the connecting rod, providing a support base for fixing the lower end of the connecting rod, Providing a resilient support member for supporting the support base, and inserting the male mold into the female mold while the peripheral end of the magnesium plate is received by the shrinkage restricting plate. 7. The method according to claim 6, wherein the shrinkage restricting plate is attached in a vertical movement relative to the base plate relative to the male mold, and spring means are provided for biasing the shrinkage limiting plate downwards. 7. The deep drawing forming method according to claim 6, wherein the female mold is fitted to its upper surface by a fixing member. 7. The molding process according to claim 6, further comprising: oblique lines of circular grooves at each corner of the die having a rectangular shape in plan view; Intersections (c, f) at both sides of the opposite end of the circular groove and at both sides of the die corner; And intersection points g, h, i, and proportional to the arcs b1 and b2 in contact with the inner angle formed by the flat surface portion k on both sides of the middle and intersection points c, f of the circular groove line; j), wherein the five points (g, h, k, i, and j) are connected together by a continuous curved surface to form a die for the male mold and the female mold. Way. 10. The method of claim 9, wherein a concentration of five forces is provided in the corner or curved surface portion to diffuse or disperse the concentration of the force at five intersections so that the concentrated force is dispersed, and can effectively prevent the occurrence of shrinkage or gold in the curved portion. Deep drawing forming processing method, characterized in that the concentration of the force by the press operation is distributed to five or more points.