KR19990081179A - Deep Draw Processing Machine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep drawing processing apparatus for placing a sheet metal on a die and pressing a material with a punch to form a cup-shaped recessed object. Particularly, the present invention relates to a deep drawing processing apparatus. The workpiece is formed of a plurality of main processing unit and the finishing processing unit which is formed integrally at the lower end of the main processing unit and performs ironing processing so that the wall thickness of the sheet metal processed into the cup shape by the main processing unit is uniform. An integrated die to be loaded; By providing a deep drawing processing apparatus composed of a punch installed on the upper side of the integrated die to provide a processing force to the workpiece, the mold and equipment required for each process are eliminated by eliminating the need for separately providing the mold and equipment according to each step. As the number of equipment is reduced and its size is reduced, the stroke length of punch or die is reduced, which reduces the processing time and improves the degree of the processed product, and the initial equipment investment for the equipment is greatly reduced, thereby reducing the manufacturing cost of the processed product. .

Description

Deep Draw Processing Machine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deep drawing processing apparatus, and more particularly, to a deep drawing processing apparatus having an integrated die configured to perform redrawing, which has been performed in stages, at a time.

Dye drawing is a method of making a cup-shaped hollow object by placing a sheet metal on a die and pressing a material with a punch. Due to the nature of processing, a set of upper and lower molds consisting of a punch and a die is essential.

1A and 1B, a typical deep drawing processing apparatus includes a die 3 having a sheet metal 1 to be processed and a hole formed in a cup shape in which the sheet metal 1 is to be processed, and It is composed of a punch (5) is installed on the upper side of the die (3) to provide a machining force to the sheet metal (1), in such a deep drawing processing apparatus after placing the sheet metal (1) on the die (3) The punch 5 is lowered and the sheet metal 1 is formed into a cup by applying a processing force to the sheet metal 1.

Instead of lowering the punch 5 as described above, the sheet metal 1 may be formed by performing dip drawing in such a manner that the die 3 is raised after the punch 5 is fixed.

In the above, when the dimensions of the die 3 and the punch 5 and the thickness of the sheet metal 1 are constant, there is a limit diameter of the sheet metal 1 in which the workpiece is not wrinkled. Blank holders (7) are used to prevent wrinkles on the workpiece, and the pressing ring (7) is installed on the upper side of the die (3) to press the edge of the sheet metal (1). At this time, when the diameter of the sheet metal (1) is less than the limit diameter it is not necessary to use the pressing ring (7).

In addition, the thickness of the sheet metal 1 is changed during the draw process, an appropriate gap is formed between the die 3 and the punch 5 as a clearance for this, and this is called clearance. When the clearance is small, the material is subjected to ironing between the die 3 and the punch 5 to have a uniform thickness, thereby performing deep drawing-ironing processing. This eliminates the need for separate ironing.

In the deep drawing process as described above, in order to produce cups of constant diameter and different heights, various sheet metals 1 having different diameters are required. As the diameter of the sheet metal 1 increases, the draw amount increases, so that the maximum draw force increases together. In addition, if the diameter of the die 3 hole is constant, the drawing force of a certain sheet metal 1 may cause a material in the radial portion near the bottom of the cup to reach a load in which failure occurs without supporting the punch load. This load also varies depending on the size of the sheet metal 1, so that there is a limit draw ratio, which is the ratio of the maximum diameter of the sheet metal 1 to the diameter of the punch 5, in which the drawing can be successful.

Therefore, in order to form a cup-shaped product such as a casing deep, it is necessary to perform a multi-step processing by carrying out redrawing, which draws back the already drawn workpiece.

There are two basic methods such as direct throwing and reverse throwing. In the direct throwing, the original outer surface of the cup is the outer surface of the cup which has been thrown as shown in FIG. 2.

In order to make the condenser case 10 having a length of 10 mm and a diameter of 4.5 mm by using the direct jaw throwing, as shown in FIG. 3, first, with a flange having a diameter of 12.0 mm and a length of 4.3 mm through primary processing. After forming into a cone shape (a), the primary workpiece is again formed into a cylindrical shape (b) with a flange having a diameter of 9.0 mm and a length of 5.1 mm by secondary processing. At this time, the thickness of the sheet metal as the workpiece is 0.4 mm.

After that, through the third, fourth, fifth, sixth, seventh, and eighth processing, the flanged cylindrical form (c) having a diameter of 7.0 mm and a length of 6.0 mm, respectively, a flanged cylinder with a diameter of 6.5 mm and a length of 6.7 mm, respectively. Form (d), flanged cylindrical form (e) having a diameter of 5.8 mm and a length of 7.6 mm (e), a flanged cylindrical form having a diameter of 5.2 mm and a length of 8.5 mm (f), a cylindrical form with a flange having a diameter of 4.9 mm and a length of 9.4 mm ( g), and formed into a cylindrical cylindrical shape (h) with a diameter of 4.7 mm and a length of 9.8 mm, and finally formed into a cylindrical cylindrical shape (i) with a diameter of 4.5 mm and a length of 10.0 mm through a 9th process to form a condenser case. Complete (10).

However, in the direct direct drawing, since the material is subjected to work hardening by plastic deformation continuously in one direction, the processing rate decreases as the processing proceeds.

Thus, reverse redrawing as shown in FIG. 4 has been devised as a method for increasing the processing rate in secondary or higher reworking. In the reverse drawing, since the original outer surface of the cup becomes the inner surface of the cup drawn, the compression and tension directions of the materials are reversed to each other, so that the work hardening of the cup wall is less severe than when forming using the direct drawing. This makes it easier to control the metal around the die radius. In addition, in reverse drawing, since the die itself partially performs the function of the pressing ring, the necessity of the pressing ring is reduced, and since the shape of the die is not limited, it is easy to control wrinkles.

However, the reverse draw owing is accompanied by a large clearance between the punch and the die due to the mold structure and the characteristics of the mold material, so that secondary finishing is necessary to obtain a high-precision product. In addition to the mold, a separate mold for finishing should be provided.

In summary, in order to obtain a processed product having a draw ratio more than a certain amount, it is preferable to perform redrawing. However, the conventional redraw apparatus must include all molds and equipment according to each processing step individually. Due to the large size of the mold and equipment, the space occupied by each mold and equipment is increased, thereby decreasing the space efficiency of the factory and increasing the initial capital investment, thereby increasing the manufacturing cost.

In addition, the conventional re-drawing apparatus has a problem that the processing time is increased and the degree of the workpiece is reduced because the size of the mold and equipment is large, the stroke length of the punch is increased. The degree of degradation of such a workpiece is accompanied with serious problems, especially when the workpiece is a container for storing high pressure gas such as LPG.

In addition, the conventional re-drawing apparatus has to be repeatedly loaded and processed in a mold suitable for each step, and then unloaded again to load the mold in the next step, which is cumbersome and precise. Not only is the fall, but also the number of processes is increased, there is a problem that the work efficiency is lowered and the productivity is reduced.

Particularly, in the reverse drawing during the redrawing, a separate mold for finishing processing must be provided separately, thereby further increasing the above problems. Therefore, there is an urgent need for a way to improve this.

The present invention has been made in order to solve the above problems, the mold and the equipment according to each step by having an integral die having a plurality of main processing parts are formed integrally formed at the same time arranged to have an inner diameter gradually reduced in steps Since the number of molds and equipment required for machining is reduced and the size is reduced, the stroke length of the punch or die is reduced, which reduces the processing time and improves the degree of the workpiece. It is a first object of the present invention to provide a deep drawing processing apparatus which greatly reduces the amount of equipment investment, thereby reducing the manufacturing cost of the processed product.

In addition, the present invention can be carried out in a step by step by the integrated die by having an integrated die at a time, so as to improve the accuracy of the workpiece, as well as the process and the number of processes is simple draw drawing to improve the productivity It is a second object to provide a processing apparatus.

Figure 1a is a configuration diagram showing a state before the drawing of a typical deep drawing processing apparatus (Deep drawing),

Figure 1b is a configuration diagram showing a state after the draw of the general deep drawing processing apparatus;

2 is a block diagram showing a direct re-drawing method according to the prior art,

3 is a process diagram for molding a condenser case according to a direct re-drawing method according to the prior art,

4 is a configuration diagram showing a reverse re-drawing method according to the prior art,

5 is a configuration diagram showing a deep drawing processing apparatus according to the present invention,

Figure 6 is a block diagram showing the structure of a punch in a deep draw processing apparatus according to the present invention.

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

50: workpiece 60: integral die

61: first processing portion 63: first protrusion

65 second processing part 67 second projection

69: finishing process 70: punch

71: first punch part 73: second punch part

75: Abharing

According to a first aspect of the present invention for achieving the above object, an integral die which is formed to have an inner diameter gradually reduced in size and at the same time having a plurality of main processing unit formed integrally with each other and the workpiece is loaded thereon; There is provided a deep draw processing apparatus, which is provided on the upper side of the integrated die and constitutes a punch for providing processing force to the sheet metal.

In addition, according to the second aspect of the present invention, the integrated die is integrally formed at the lower end of the main processing portion to finish the ironing process so that the wall thickness of the workpiece processed into the cup shape by the main processing portion is uniform. It further comprises a wealth.

Further, according to the third aspect of the present invention, a protrusion formed obliquely downward is formed between each of the main processing portion and the finishing processing portion, and the clearance is secured to each of the main processing portion and the finishing processing portion by the protrusion, The integral die is formed such that its thickness becomes thicker toward the lower side.

In addition, according to the fourth aspect of the present invention, the punch is provided with a processing force to the sheet metal, after providing a certain amount of processing force, the first punch portion formed to perform a function of the pressing ring, and the first punch portion When the first punch part starts to perform the function of the pressing ring inherently, it is a multi-structure composed of a second punch part which protrudes below the first punch part to provide a machining force to the sheet metal.

The present invention configured as described above does not need to separately provide the mold and the equipment according to each step, so that the number of molds and equipment is reduced and the size thereof is reduced, so that the stroke length of the punch or die is reduced and the machining time is shortened. The degree of the workpiece is improved, and the initial investment in equipment is greatly reduced, thereby reducing the manufacturing cost of the workpiece.

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

Figure 5 is a block diagram showing a dip draw processing apparatus according to the present invention, Figure 6 is a block diagram showing the structure of a punch of a die draw processing apparatus according to the present invention.

Referring to FIG. 5, the deep draw processing apparatus according to the present invention is a wrinkle suppressing draw-off method formed to enable reverse drawing, and is formed integrally with each other while being arranged to have an inner diameter gradually reduced in stages. The main processing portions 61 and 65 and the lower ends of the main processing portions 61 and 65 so as to have a uniform wall thickness of the sheet metal 50 processed into the cup shape by the main processing portions 61 and 65. An integrated die (60) comprising a finishing unit (69) for ironing and having a workpiece (50) loaded thereon; It is composed of a punch 70 is provided on the upper side of the integrated die 60 to provide a processing force to the workpiece (50).

Here, the pressure reduction ring 75 is installed above the integrated die 60 to press the edge of the workpiece 50 during drawing so that wrinkles do not occur in the workpiece.

In addition, the main processing portion 61, 65 is formed integrally with the first processing portion 61 having a first inner diameter and the lower end of the first processing portion 61 and at the same time has a second inner diameter smaller than the first inner diameter. It has a 2nd process part 65 which has.

In addition, the punch 70 is a first punch portion formed to perform the function of the pressing ring 75 after providing a processing force to the workpiece 50, as shown in Figure 6, after providing a certain amount of processing force 71 and inherent in the first punch portion 71, and when the first punch portion 71 starts to perform the function of the pressing ring 75, the lower portion of the first punch portion 71. It is a dual structure consisting of a second punch portion 73 which protrudes to provide a processing force to the workpiece 50.

In addition, a first protrusion 63 and a second protrusion 67 formed to be inclined downward are formed between the first machining part 61, the second machining part 65, and the finishing machining part 69. The clearance is secured to the 2nd process part 65 and the finishing process part 69 by the 1st protrusion part 63 and the 2nd protrusion part 67. As shown in FIG. Here, the clearance acts as a clearance for the workpiece 50 because the thickness of the workpiece 50 changes in the draw process.

In addition, the integrated die 60 is formed to have a thicker thickness toward the lower side, the preliminary compressive stress is formed on the lower side of the integrated die 60 by using a shrink fit method. This is to prevent the integral die 60 from being broken by the pulling force of the punch 70 and the workpiece 50 during drawing.

Although not shown in the drawings, the main machining portion of the integrated die 60 has a first machining portion having a first inner diameter, and a second inner diameter which is integrally formed at the lower end of the first machining portion and smaller than the first inner diameter. A second machining portion having a third machining portion integrally formed at a lower end of the second machining portion and having a third inner diameter smaller than the second inner diameter; And an N-th processing unit integrally formed at the lower end of the N-th processing unit and having an N inner diameter smaller than the N-th internal diameter, and the punch 70 provides a machining force to the sheet metal, After providing, the first, second, third,... , The N-1 punch portion and the first, second, third,... , 1-1, 2, 3,... When the N-1 punch part starts to perform the function of the pressing ring, the first, second, third,... Second, third, fourth,... Protruding downward of the N-1 punch portion to provide a machining force to the sheet metal. It may be formed in a multiple structure consisting of N punch portions.

In addition, the finishing processing unit 69 may be formed of a plurality of ironing processing unit formed integrally with each other while being formed to have an inner diameter gradually reduced in stages.

Operation of the deep draw processing apparatus according to the present invention configured as described above is as follows.

First, the workpiece 50 is formed into a convex cup shape by using the integrated die 60, and then the punch 70 is lowered toward the primary workpiece to apply a machining force to reverse the primary workpiece. Carry out the oing. At this time, the primary workpiece is reversed while passing through the first machining portion 61 of the integrated die 60.

Subsequently, the secondary workpiece which has undergone reverse redrawing is passed directly through the second machining portion 65 of the integrated die 60 to be directly redrawn and molded into a desired shape. That is, the length is increased as the diameter is reduced by forming a cup shape having a diameter having the same size as the second inner diameter of the second machining portion 65.

Subsequently, the third processed product passing through the second processed part 65 is ironed while passing through the finish processed part 69 of the integrated die 60, so that the wall thickness thereof becomes uniform, whereby a cup-shaped processed product is obtained. Is completed.

In the above, when the primary workpiece is reversed drawing while passing through the first processing portion 61, the processing force of the first punched portion 71 of the punch 70 acts to draw, but reverse drawing is performed. When the rough secondary workpiece passes through the second machining portion 65, direct jaelowing proceeds by the processing force of the second punch portion 73 protruding downward of the first punch portion 71.

At this time, while the direct punching of the secondary workpiece is performed by the second punch portion 73, the first punch portion 71 is disposed between the first processing portion 61 and the second processing portion 65. While acting on the first protrusion (63) formed in the to serve as the pressure reduction ring (75).

The deep drawing processing apparatus according to the present invention configured and operated as described above is arranged to have an inner diameter gradually reduced in stages, and a plurality of main processing portions 61 and 65 integrally formed with each other, and the main processing portion 61. , 65) is formed integrally at the lower end of the finishing process portion 69 for performing ironing process so that the wall thickness of the workpiece 50 processed in the cup shape by the main processing portion (61, 65) The integrated die 60 eliminates the need for separate molds and equipment according to each step, thereby reducing the number of molds and equipment and miniaturizing the size, thereby reducing the space occupied by the equipment and increasing space efficiency of the factory. Of course, the initial equipment investment for the equipment is reduced to reduce the manufacturing cost, the stroke distance of the punch 70 is reduced, the processing time is shortened and the degree of the processed product. There is an advantage that is improved.

In addition, the present invention is provided with the integrated die 60 described above can be carried out step by step the re-drawing each step at a time to improve the accuracy of the workpiece as well as the processing work and the number of steps is simple and the work efficiency is increased Therefore, there is an advantage that the productivity and yield of the product is improved.

Claims (4)

An integrated die which is formed to have an inner diameter gradually reduced in stages and is integrally formed with each other, and has a work piece loaded thereon, and a punch provided on the upper side of the integrated die to provide processing power to the sheet metal. Deep drawing processing apparatus, characterized in that configured. The method of claim 1, The integrated die is integrally formed at the lower end of the main processing part, and further comprises a finishing process for performing ironing processing so that the wall thickness of the workpiece processed in the cup shape by the main processing part is uniform. Drawing process equipment. The method according to claim 1 or 2, A protrusion formed obliquely downward is formed between each of the main processing portion and the finishing processing portion, and a clearance is secured to each of the main processing portion and the finishing processing portion by the protrusion, and the integrated die is gradually lowered toward the lower portion. Deep drawing processing apparatus characterized in that the thickness is formed to be thick. The method of claim 1, The punch is a first punch portion formed to provide a machining force to the sheet metal, and after providing a certain amount of processing force, and the first punch portion is formed in the first punch portion, and the first punch portion is a reduction ring The die-draw processing apparatus, characterized in that the multi-layer structure consisting of a second punch portion protrudes to the lower side of the first punch portion to provide a machining force to the sheet metal when it starts to perform the function.