KR100296923B1 - Multi-stage drawing method and apparatus - Google Patents

Abstract

The present invention relates to a multi-stage drawing method and apparatus, which is capable of completing a drawing process for producing a cylindrical container having a depth of more than twice the diameter and having a multi-stage thickness in one apparatus. According to the present invention, it is possible to continuously perform the drawing process of the cylindrical container in one machine, which greatly shortens the time of the drawing process and greatly reduces the number of workers required for the drawing process. There is an advantage that can be made using the base material.

Description

Multi-stage drawing method and apparatus

The present invention relates to a multi-stage drawing method and apparatus, and more particularly, to a multi-stage drawing method and apparatus for continuously manufacturing a cylindrical container having a multi-wall thickness ratio of 2.0 or more in depth depth to diameter. It is about.

First, the manufacturing of a cylindrical container in the prior art will be described. Generally, in order to manufacture a cylindrical container using a metal sheet, the raw material is melted and slab

Plates are made by casting, hot / cold rolling. Then, the sheet is blanked to a predetermined size, and the blanked sheet is processed in a multi-stage drawing (mu1ti-stage drawing).

The multi-stage drawing process includes a primary drawing step, a secondary reverse drawing step, and a third drawing-h

Completed through the sequential steps.

After the multi-stage drawing as described above to produce a cylindrical container, a post-treatment process such as trimming, spinning or aging processing is performed, and a completed cylindrical container is manufactured through a heat treatment process, a painting process, and an inspection process.

However, in the cylindrical container manufacturing process as described above, multi-stage drawing could not be performed in one drawing machine, and each step had to be performed in a different device. This is especially the case in the case of cylindrical containers having a relatively deep and multi-wall thickness in which the ratio of the depth to the diameter of the cylindrical container is 2.0 or more.

That is, since each step is performed on a different machine, it takes more time to prepare for a job than a working time, requires as many machines as the number of machines, and there is a problem that product defect rate is determined according to the skill of the worker.

Especially, when used as a pressure vessel containing high pressure gas, after continuous molding

The wall thickness must be kept uniform, and the multi-stage wall thickness required for the post-treatment process such as spinning and aging must be ensured, but this is not the case (the uniform mechanical rigidity in the thickness direction is not guaranteed). Not to cause deformation of the container during use.

On the other hand, a pressure vessel containing such a high-pressure gas is also made by welding a plurality of pieces, but when welding in this way, the appropriate pressure resistance at the welded joint is not guaranteed, it is integrated through drawing work (one- piece) Pressure vessels have been required to be manufactured.

The present invention solves the conventional problems as described above, to continuously manufacture a cylindrical container having a ratio of depth to diameter of 2.0 or more in one drawing device.

1 is a cross-sectional view showing the configuration of a drawing apparatus according to the present invention.

Figures 2a, b, c, d is a process flow chart showing that the drawing is sequentially performed using the drawing device according to the present invention.

Figure 3 is a cross-sectional view showing a state in which the first drawing is completed in the drawing device according to the present invention.

Figure 4 is a cross-sectional view showing a state in which the second drawing is completed in the drawing device according to the present invention.

Figure 5 is a cross-sectional view showing a state in which the third drawing and ironing is completed in the drawing device according to the present invention.

6a, b, c, d are cross-sectional views sequentially showing a workpiece blanked into a circular plate, and a primary workpiece, secondary workpiece and tertiary workpiece formed through respective processes;

* Explanation of symbols for main parts of the drawings

10: first die 11: loading surface

12: die cavity 20: second die

21: Gripping surface 22: Die cavity

25: shoulder pressing portion 30: the first drawing mold

31: rounding part 32: drawing cavity

33: regulation jaw 35: fixed surface

37: ironing wood 40: second drawing mold

41: rounding part 50: punch mold

51: first surface 52: second surface

55: air hole w: workpiece

According to a feature of the present invention for achieving the object as described above, the present invention provides a first drawing while holding the first and second die holding the workpiece, and through the die by the movement of the first and second die. The first drawing means to perform, and is installed so as to be movable through the interior of the first drawing means and moved in the direction opposite to the direction of the first drawing to perform a second drawing, wrinkles in the workpiece during operation A second drawing means provided with a shoulder pressing portion, a third drawing means installed in the second drawing means and movable further in the same direction as the second drawing means, and performing a third drawing; An ironing neck having a diameter equal to an outer diameter of the punching die, and a punch mold passing through the ironing neck having a diameter equal to an inner diameter of each of the parts 3 is at the same time and the third drawing is progressed by the drawing means comprises an ironing means for performing the ironing operation to set the thickness of each part of the work.

The first drawing means may include a die cavity formed to penetrate the first and second dies, and a first drawing mold positioned in the die cavity to draw a workpiece by movement of the first and second dies. Include.

The second drawing means includes a drawing cavity formed to penetrate the inside of the first drawing mold, and a second drawing mold for drawing a workpiece while being moved into the drawing cavity.

The third drawing means is a punch mold for drawing a workpiece while passing through the drawing cavity of the first drawing mold, the second drawing mold is installed in the second drawing mold after the operation of the second drawing mold is completed. Drawing the workpiece while protruding from it.

During the third drawing, the first drawing mold and the second drawing mold hold one side of the workpiece to prevent wrinkle defects.

According to another feature of the invention, the present invention is a first drawing step for drawing to have a diameter larger than the diameter of the finished product in the state holding the plate-shaped workpiece, and the first drawing in a direction opposite to the direction of the first drawing A second drawing step of performing reverse drawing to have a diameter smaller than the diameter formed in the step and larger than the diameter of the finished product, and simultaneously drawing the second drawn workpiece to a depth not less than twice the diameter;

And a drawing-ironing step of ironing to form a thickness.

The step proceeds continuously in one device.

According to the multi-stage drawing method and apparatus according to the present invention having such a configuration, there is an advantage that a cylindrical container having a thickness of multiple stages having a depth of more than twice the diameter can be more easily manufactured.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention as described above in detail as follows.

1 shows a configuration of a multi-stage drawing device according to the present invention. According to this, the 1st die 10 and the 2nd die 20 which hold | grip the workpiece | work w are provided facing each other.

The first die 10 has a loading surface 11 on which a workpiece w is placed, and a cylindrical die passing through the first die 10 at the center of the loading surface 11. The cavity 12 is formed. In addition, the second die 20 is installed to face the first die 10, and a gripping surface 21 is formed on the loading surface 11 to hold the workpiece. A cylindrical die cavity 22 penetrating the second die 20 is formed at the center of the gripping surface 21.

On the other hand, the part where the gripping surface 21 of the second die 20 meets the die cavity 22 is rounded so that the drawing of the workpiece w is smoothly performed. On the other hand, the shoulder pressing portion 25 is formed at the end of the die cavity 22 opposite to the holding surface 21 of the second die 20. The shoulder press portion 25 serves to prevent the occurrence of wrinkles in the workpiece (w) by pressing one side of the workpiece (w) during the drawing operation.

Although not shown in the drawing, between the loading surface 11 and the gripping surface 21, a metal bark made in a blanking process for making a workpiece (for example, a circular plate) used in the apparatus of the present invention ( It is preferable that a configuration for removing Bur) is provided. Such a configuration has already been filed by the present applicant, so detailed description thereof will be omitted.

The first drawing mold 30 is positioned in the die cavities 12 and 22 of the first die 10. The first drawing mold 30 is for performing the first drawing of the workpiece (w), the rounded portion 31 is formed at the tip. The rounding part 31 is a part which contacts with the workpiece | work w at the 1st drawing, and makes drawing. And, on one side of the outer surface of the first drawing mold 30 is formed a limiting jaw 33 for regulating the stroke of the first drawing process.

On the other hand, the drawing cavity 32 is formed through the inside of the first drawing mold (30). A downstream portion of the drawing cavity 32 is provided with a configuration for third drawing and ironing. That is, the fixing surface 35 for holding the workpiece (w) during the third drawing surrounding the inner diameter surface of the downstream portion of the drawing cavity 32 is formed, the ironing for setting the thickness of the workpiece at the downstream end A neck 37 is provided.

A second drawing mold 40 is installed to move through the inside of the die cavities 12 and 22 formed in the first and second dies 10 and 20. The second drawing mold 40 passes through the inside of the drawing cavity 32 of the first drawing mold 30.

To do a rowing. The rounding part 31 is formed in the front-end | tip part of this 2nd drawing mold 40, and the workpiece | work w is drawn so that it may have a diameter slightly larger than the diameter of a finished product.

The punch mold 50 is installed inside the second drawing mold 40 to perform a third drawing process. The punch mold 50 is installed inside the second drawing mold 40 to operate integrally with the second drawing mold 40, and then protrudes from the second drawing mold 40 during the third drawing process. Will be performed. The punch mold 50 as described above has the same outer surface shape as that of the finished product.

The gap between the outer surface of the punch mold 50 and the ironing neck 37 when the punch mold 50 passes through the ironing neck 37 becomes the wall thickness of the finished product. Therefore, the diameter of the surface of the punch mold 50 varies according to the wall thickness of the finished product as shown in FIG. That is, if the finished product has a thickness of two stages, it is composed of a first surface 51 and a second surface 52 having a relatively step as shown in the figure. On the other hand, the air hole 55 is drilled through the punch mold 50 in the longitudinal direction. The air hole 55 is to allow the workpiece to be easily removed from the punch mold 50 after completion of the drawing.

Performing the multi-stage drawing by the present invention having such a configuration will be described in detail with reference to FIG.

Figures 2a, b, c, d, sequentially shows that the multi-stage drawing is performed according to the present invention.

First, the state of FIG. 2A corresponds to the state of FIG. 1, and the workpiece w on the circular plate shown in FIG. 6A is placed on the mounting surface 11 of the first die 10, and the gripping surface It is a state which is pressed by the 21 and is hold | gripped. In the above state, the first drawing process is performed while the first die 10 and the second die 20 go down together with the first drawing mold 30. At this time, one side of the workpiece (w) is in close contact with the rounding portion 31 formed on the tip of the first drawing mold, the other side is in close contact with the rounded portion of the second die 20 in the first state The drawing proceeds by the movement of the die and the second die 10, 20. During this first drawing process, the iron bark generated when blanking the workpiece w on the circular plate is removed. And, as shown in Figure 3, the movement of the first and second die 10, 20, when the lower surface of the first die 10 is caught by the restricting jaw 33 of the first drawing mold Proceeds to.

When the first drawing process is completed in this manner, the work w in Fig. 6B is produced.

At this time, the workpiece (w) has a diameter larger than the diameter of the finished product, the depth of the

It is only as large as the movement stroke of the dies 10 and 20.

Then, the second drawing process proceeds as follows. That is, in the state of FIGS. 2B and 3, the second drawing mold 40 enters the drawing cavity 32 formed inside the first drawing mold 30. In this case, the cylindrical workpiece (w) obtained in the first drawing process is drawn again, and the state becomes in FIG. 6C.

At this time, the second drawing mold 40 acts in the opposite direction as in the first drawing process, so that a constant reverse redrawing process in which bending in the same direction continues is performed. This completely changes the inside and the outside of the workpiece w similar to the general redrawing process, and the required punch force is reduced by that amount, and also shows a drawing effect that is very useful when continuous redrawing is performed in connection with the first drawing.

By this second drawing process, as shown in Fig. 6c, a workpiece w having a cylindrical shape smaller than the diameter of the finished product and smaller than the workpiece w in Fig. 6b is produced.

Meanwhile, in the second drawing process, the shoulder pressing portion 25 of the second die 20 presses one side of the workpiece w together with the rounding portion 3l of the first drawing mold 30 to wrinkle. This prevents the occurrence of winking. In the second drawing process,

The punch mold 50 moves integrally with the second drawing mold 40.

Finally, the third drawing process proceeds from the state of FIG. 2C to the state of FIG. 2D. That is, in the state of FIG. 4, the punch mold 50 protrudes from the second drawing mold 40 and passes through the ironing neck portion 37 downstream of the drawing cavity 32 to be in the state of FIG. 5. This third drawing process is actually a process in which drawing and ironing are simultaneously performed.

The biasing mold 50 protruding from the second drawing mold 40 is ironed while drawing the work w. That is, ironing in which wall thicknesses T and t are formed in accordance with the distance between the side of the punch mold 50 passing through the ironing neck portion 37 and the ironing neck portion 37 is made simultaneously with the drawing. do. At this time, the work (w) is held by one side of the fixed surface 35 of the first drawing mold 30 and the rounding part 31 of the second drawing mold 40, the work (during the third drawing process ( It maintains the position to prevent wrinkles in w).

As such, the third drawing process produces the work w as shown in FIG. 6D having the same inner surface as the outer surface of the punch mold 50. And the thickness T, t of the workpiece | work w is set by the 1st and 2nd surface 51 and 52 of the said displacement mold 50. As shown in FIG. When the third drawing process is completed in this way, the air is supplied through the air hole 55 in the punch mold 50 to remove the work w to complete the finished product by the multi-stage drawing process.

The finished product is then made into a single product through a post-treatment process such as trimming, spinning, aging, heat treatment, and painting.

Multi-stage drawing method and apparatus according to the present invention as described in detail above

The drawing process for forming a cylindrical container having a depth more than twice the diameter and a multi-stage wall thickness can be continuously performed in one device. Therefore, unlike the related art, since the workpiece for drawing is not attached to the apparatus for performing the respective drawing process and does not need to be removed, the drawing process time and the number of people can be significantly reduced, and as the drawing proceeds continuously in one device, The effect of increasing the quality uniformity of the drawn workpiece can be expected.

In addition, the present invention can accurately set the wall thickness of the finished product,

The base material can be used to make a cylindrical container, which is particularly helpful for the production of integrated high pressure containers.

Claims (7)

First and second dies for holding a workpiece, first drawing means for performing a first drawing while penetrating the die by movement of the first and second dies, and movable through the interior of the first drawing means A second drawing means provided with a shoulder press to be installed so as to move in a direction opposite to the direction of the first drawing to perform a second drawing, and to prevent wrinkle defects in the workpiece during operation; and the second drawing means. A third drawing means movably installed in the second drawing means, the third drawing means moving further in the same direction as the second drawing means to perform a third drawing, an ironing neck having the same diameter as the outer diameter of the finished product, and an inner diameter of each part of the finished product. Punch mold passing through the ironing neck and having the same diameter, respectively, and the third drawing by the third drawing means and at the same time two of each part of the workpiece Multi-stage drawing unit, characterized by configured including ironing means for performing the ironing operation to set. The method of claim 1, wherein the first drawing means is a die cavity formed through the interior of the first and second die, and located in the die cavity to draw the workpiece by the movement of the first and second die Multi-stage drawing device comprising a first drawing mold. The method of claim 1, wherein the second drawing means comprises a drawing cavity formed to penetrate the inside of the first drawing mold, and a second drawing mold for drawing a workpiece while moving into the drawing cavity Multi-stage drawing device. The method of claim 1, wherein the third drawing means is a punch mold for drawing the workpiece while passing through the drawing cavity of the first drawing mold, the inside of the second drawing mold is installed in the operation of the second drawing mold Multi-stage drawing device, characterized in that for drawing the workpiece while being projected from the second drawing mold after completion. The multi-stage drawing apparatus of claim 1, wherein the first drawing mold and the second drawing mold hold one side of the workpiece to prevent wrinkle defects during the third drawing. The first drawing step of drawing to have a diameter larger than the diameter of the finished product in the state of holding the plate-shaped workpiece, and the smaller than the diameter formed in the first drawing step in the direction opposite to the direction of the first drawing and larger than the diameter of the finished product A second drawing step of performing reverse drawing to have a diameter, and a drawing-ironing step of drawing the second drawn workpiece to a depth greater than twice the diameter and simultaneously forming a thickness of each part; Multistage drawing method characterized in that the configuration. 7. The method of claim 6, wherein said step proceeds continuously in one device.