KR101642352B1 - progressive metallic mold for drawing works - Google Patents

Abstract

The progressive die for drawing processing according to the present invention can produce a hollow columnar part having a different thickness on the upper side and a lower part on the lower side by drawing processing and can reduce the occurrence of shock lines and scratches and increase the efficiency and uniformity of molding .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a progressive metallic mold for drawing works,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a progressive die for drawing processing, and more particularly, to a progressive die for drawing processing capable of producing a hollow columnar part having an upper thickness and a lower thickness by drawing.

If the shape of a quadratic column, a column, an elliptical column, or the like is subjected to plastic working by bending, a connecting line is necessarily formed at the center of the large surface of the product, and the portion where the connecting line is contacted is lifted due to the bending angle. A mechanical machining process is required to increase the flatness of the flat surface by pressing with a caulking method in addition to a hanging shape, and a lot of loss occurs because it must be managed. Particularly, when the columnar parts having different thicknesses of the upper and lower parts are produced by the bending process, the above-described problem is more conspicuous.

A method for solving the problem of the bending process described above includes a method of producing a part by drawing processing. However, in the drawing process, shock lines and scratches are likely to occur on the parts, which makes it difficult to use the parts as an exterior material. Of course, it is possible to remove shock lines and scratches by a method such as sanding buffing after the drawing process, but the productivity is lowered and the manufacturing cost is inevitably increased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a progressive die for drawing processing, which can produce hollow columnar parts having different thicknesses of the upper and lower thicknesses by drawing.

It is another object of the present invention to provide a progressive die for drawing processing which can produce a hollow columnar part having a different thickness of the upper part and the lower part by drawing while reducing the occurrence of shock lines and scratches.

The technical objects to be achieved by the present invention are not limited to the technical matters mentioned above, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

According to a first aspect of the present invention, there is provided a progressive die for drawing processing, comprising: a notching mold group for cutting the edges of a target region to be processed into hollow columnar parts having different diameters at upper and lower portions notching metallic mold group); A first drawing mold group for drawing the target region a plurality of times to process the target region into a first columnar first intermediate member having an upper diameter and a length of a first target range; A pre-piercing mold for piercing a portion of a lower surface of the first intermediate part to process the first intermediate part into a second intermediate part of an upper and lower opening shape; A first cam forming mold for molding a lower side surface of the second intermediate part to process the second intermediate part into a third intermediate part having a lower diameter of the first target area; A second drawing tool group for drawing the third intermediate part a plurality of times to process the third intermediate part into a fourth intermediate part having upper and lower diameters and lengths in a second target range; A main-piercing mold for piercing the lower surface of the fourth intermediate component into a final opening shape to process the fourth intermediate component into a fifth intermediate component; And a second cam forming mold for molding the upper and lower side surfaces of the fifth intermediate component and processing the fifth intermediate component into a sixth intermediate component having upper and lower diameters of a final target range.

Wherein the first cam forming mold has a shape corresponding to the upper and lower inner diameters of the third intermediate part and is lowered according to the lowering of the upper mold to lower the second intermediate part; Left and right cam punches that descend in accordance with the descent of the upper mold to provide a force for forming the lower side surface of the second intermediate component; And a pair of right and left cams slid on the basis of the force provided by the lowering of the left and right cam punches to form a lower side surface of the second intermediate component lowered by the guide punch, . ≪ / RTI >

Wherein the drawing progressive die comprises: a trimming mold for trimming the sixth intermediate part to a height of a final target range and finally separating the hollow columnar part; And a blanking mold for blanking an area including a scrap formed along the cut surface by the trimming process. The trimming mold and the blanking mold may be included in the progressive mold according to the second and third embodiments of the present invention.

The progressive metal for drawing includes a left / right punch through hole formed in the center of the upper mold and formed symmetrically on the right and left sides of the body, and a lower portion for scrap discharging formed to a height reaching at least the left / right punch through- A half hollow type die including a hollow and inserted into the fourth or fifth intermediate part as the upper die is lowered; A left and right cam punch which is provided on the upper mold and descends according to the descent of the upper mold to provide a force for side piercing; And the respective paired piercing punches of the left and right piercing punches are symmetrically provided on the left / right side of the lower mold, and based on the force applied by the lowering of the left / right cam punches, , The left and right piercing punches are pierced through the fourth or fifth intermediate part with the semi-hollow die inserted through the left and right punch through holes, / Right side sliding module, as shown in Fig. These side piercing dies may also be included in the progressive dies according to the second and third embodiments of the present invention. The semi-rigid die may include at least one air supply hole for injecting compressed air for discharging scrap generated by the side piercing operation through the lower hollow into the lower hollow.

At least one drawing die included in the first and second drawing die groups includes a drawing punch that reciprocates in a vertical direction; A die including a central through hole corresponding to the drawing punch, an oil storage groove formed surrounding the central through hole, and an inner oil path; An oil supply device for supplying drawing oil to the oil reservoir through the internal oil path before the object to be processed is placed on the oil reservoir in the preparing step; And a central through hole communicating with an upper end of the central through hole so as to apply drawing oil to the surface of the object to be processed, When the punch is drawn out, the drawing oil poured into the oil reservoir groove is discharged to the lower portion of the central through hole so that the drawing oil poured into the oil reservoir groove can be lowered And a knockout for returning to a position corresponding to the punching preparation step due to elasticity when the drawing punch is elevated. Meanwhile, in the preparing preparation step, an oil storage ring deeper than the oil storage groove may be formed along the edge of the central through hole by a round formed on at least one of the edge of the central through hole and the edge of the upper end of the knockout have. The drawing mold structure having the oil supply structure can be applied to the progressive mold according to the second and third embodiments of the present invention.

According to a second aspect of the present invention, there is provided a progressive die for drawing processing, comprising: a notching mold group for cutting the edge of a target area to be processed into a hollow columnar part having different diameters at upper and lower sides notching metallic mold group); A first drawing mold group for drawing the target region a plurality of times to process the target region into a first columnar first intermediate member having an upper and lower diameters and a length in a first target range; A pre-piercing mold for piercing a portion of a lower surface of the first intermediate part to process the first intermediate part into a second intermediate part of an upper and lower opening shape; A second drawing tool group for drawing the second intermediate part a plurality of times to process the second intermediate part into a third intermediate part having upper and lower diameters and lengths in a second target range; A main-piercing mold for piercing the lower surface of the third intermediate part into a final opening shape to process the third intermediate part into a fourth intermediate part; And a camming mold for molding the upper and lower side surfaces of the fourth intermediate component and processing the fourth intermediate component into a fifth intermediate component having upper and lower diameters of a final target range.

At least one drawing die included in the first drawing die group may include a die of a first metal material having a core coupling hole formed at the center thereof; And a second metal material having a hardness higher than that of the first material but lower in elastic modulus and having grooves constituting a part of a punch through hole formed at a center thereof, And a core composed of a plurality of sub-cores. The plurality of lower cores are spaced apart from each other by a distance corresponding to a modulus of elasticity of the die based on a force applied by the punch and the metal plate passing through the punch through hole, When the die passes through the through hole, it can be restored to the originally joined state according to the modulus of elasticity of the die. The structure of the drawing die can be applied to the first embodiment of the present invention and the third embodiment of the present invention.

According to a third aspect of the present invention, there is provided a progressive die for drawing processing, comprising: a first notching die for cutting an edge of a target region to be processed into a hollow columnar part having different diameters at upper and lower portions, Notching metallic mold group; A first drawing mold group for drawing the target region a plurality of times to process the target region into a first columnar first intermediate member having a lower diameter and a length of a first target range; A second notching mold group for cutting the edge of the bending area to form the upper part of the hollow columnar part by bending the first intermediate part to process the second intermediate part; A forming mold for forming a portion corresponding to an inclined surface connecting upper and lower portions of the hollow columnar component in the second intermediate component to process the third intermediate component; A bending mold group bending the bend target area in the third intermediate product and then pressing and fixing the joint part of the bent part to process the fourth intermediate part; A second drawing mold group for drawing the fourth intermediate member a plurality of times to process the fourth intermediate member into a fifth intermediate member having upper and lower diameters and lengths in a second target range; A main-piercing mold for piercing the lower surface of the fifth intermediate part into a final opening shape to process the fifth intermediate part into a sixth intermediate part; And a camming mold for molding upper and lower side surfaces of the sixth intermediate component and processing the fourth intermediate component into a seventh intermediate component having upper and lower diameters of a final target range.

A progressive die for drawing processing according to the present invention is to provide a progressive die for drawing processing capable of producing hollow columnar parts having different thicknesses of the upper and lower thicknesses by drawing while reducing the occurrence of shock lines and scratches.

The progressive die for drawing processing according to the present invention has a structure in which a die and a core are separated from each other and a core is divided into a plurality of lower cores in a drawing die to which a large force is applied.

- First, the likelihood of die cracking can be reduced.

- Therefore, it is possible to prevent the work delay due to the replacement by the die crack and to reduce the cost due to the die remanufacturing.

- Only the core portion of the die can be made of a high-hardness metal material, and only the core portion can be replaced in some cases, thereby providing the effect of mold production cost and repair cost reduction.

- Since the core portion of the die can be manufactured by separating the core portion into a plurality of lower cores, it is possible to provide an effect that can be utilized for production of complicated and difficult products that exceed the limit of the plastic forming shape of the simple integral type metal mold.

- Cracking of the die can be prevented due to the separation of the core portion of the die, and consequently, it is possible to provide an effect to prevent a product defect due to die cracking, a further process, and a process change due to a change in punch or die have.

The progressive mold for drawing processing according to the present invention can provide the following effects by directly supplying oil heated to a predetermined temperature through a die and applying the oil to the surface of the object to be processed while drawing.

- It is possible to provide an effect of increasing the drawing forming rate.

- It is possible to provide the effect of reducing the shock line generated on the product surface.

- It is possible to provide the effect of increasing the uniformity of the product to be processed.

The progressive die for drawing processing according to the present invention can provide the following effects by simultaneously performing left and right piercing using a side-piercing mold.

- Maintain a uniform piercing alignment.

- There is an advantage that the mold production cost due to the mold size and the production cost of the press corresponding to the mold can be lowered.

- Scrap generated by piercing can be easily discharged by injecting compressed air into the hollow of the die.

1 is a block diagram of a progressive mold 100 for drawing processing according to a first embodiment of the present invention.
FIG. 2 is a view for conceptually explaining an example of a process in which the notching process is performed by the notching mold group 110 of the progressive mold 100 according to the present invention.
3 is a conceptual illustration of an example of a process of drawing processing by the first drawing die group 120 of the progressive metal 100 according to the present invention.
4 is a conceptual diagram illustrating an example of a process of performing pre-piercing by the pre-piercing mold 130 of the progressive mold 100 according to the present invention.
5 is a diagram conceptually showing a cross section of an example of the first camming mold 140 of the progressive mold 100 according to the present invention.
Fig. 6 is a view for conceptually explaining how the lower part of the hollow columnar part having different upper and lower diameters is primarily processed by the first camming mold 140 of the progressive mold 100 according to the present invention.
7 is a diagram for conceptually illustrating an example of a process in which a plurality of drawing processes are performed by the second drawing die group 150 of the progressive metal 100 according to the present invention.
8 is a conceptual view illustrating an example of a process in which main-piercing is performed by the main-piercing mold 160 of the progressive mold 100 according to the present invention.
9 is a view for conceptually explaining an example of a process of side-piercing processing performed by the side-piercing mold 170 of the progressive mold 100 according to the present invention.
10 is a view for conceptually explaining how the upper and lower portions of the hollow columnar part having different upper and lower diameters are cam-formed by the second camming mold 180 of the progressive mold 100 according to the present invention .
11 shows that the hollow columnar part is finally separated from the metal plate by the trimming mold 190 of the progressive mold 100 according to the present invention.
Fig. 12 shows an example of a hollow columnar part whose upper and lower diameters are different finally processed in the progressive mold 100 according to the present invention.
FIG. 13 is a view for conceptually illustrating that blanking is performed by the blanking mold 200 of the progressive metal 100 according to the present invention.
Fig. 14 shows an example of a lower mold of a progressive mold 100 according to the present invention actually manufactured.
Fig. 15 shows examples of the types of cracks occurring in the integrated die 210 of the conventional drawing die.
16 is a view for explaining a structure of a lower mold 300 of a drawing die included in a progressive metal for drawing processing according to the present invention.
17 is a view for explaining the structure of the core 320 of the lower mold 300 of the drawing die included in the progressive metal for drawing processing according to the present invention.
18 shows that the distance between the lower cores 321 and 322 constituting the core 320 of the lower mold 300 included in the progressive metal for drawing according to the present invention in the pressing process is variable.
19 is a view showing various examples of cores that can be provided in a lower mold of a drawing die included in a progressive die for drawing according to the present invention.
FIG. 20 is a view showing a part of a core for explaining another example of a criterion in which a core division line is formed in a lower mold of a drawing die included in a progressive die for drawing according to the present invention. FIG.
21 is a view showing still another example of forming a core dividing line in a lower mold of a drawing die included in a progressive die for drawing processing according to the present invention.
22 shows examples of determining the priority order of the vertexes of the punch through holes to be a reference for core division in the lower mold of the drawing die included in the progressive metal for drawing processing according to the present invention.
23 is a view showing an example of a process of coupling a die and a core in a lower mold of a drawing die included in a progressive die for drawing according to the present invention.
Fig. 24 shows actual photographs of the lower mold 300 of the drawing die included in the progressive metal for drawing processing according to the present invention.
25 is a view conceptually showing a configuration of a drawing die 400 included in a progressive die for drawing processing according to the present invention.
FIG. 26 is a top view of an example of a die 420 of a drawing die 400 included in a progressive die for drawing processing according to the present invention.
27 is a diagram showing an example of a driving method of a drawing die 400 included in a progressive metal for drawing processing according to the present invention.
FIG. 28 is a view showing a part of a process in which the driving method of the drawing die 400 shown in FIG. 27 is performed.
FIG. 29 shows examples in which the drawing oil is collected in the oil storage groove 422 of the die 420 of the drawing die 400 in the drawing preparation step of the drawing die of the progressive drawing die for drawing according to the present invention.
Fig. 30 shows examples in which oil supply holes are formed in the oil storage grooves 422 of the die 420 of the drawing die 400, which can be included in the progressive metal for drawing processing according to the present invention.
Figure 31 shows examples of combinations of die 420, knockout 440, and backing plate 460 that may be embodied in a drawing die 400 included in a progressive die for drawing in accordance with the present invention.
32 is a view for explaining an example of a structure of a backing plate 460 that can be implemented in a drawing die 400 included in a progressive metal for drawing processing according to the present invention.
33 is a view for explaining an example of the shape of the inner oil path 423 of the die 420 of the drawing die 400 included in the progressive metal for drawing processing according to the present invention.
Fig. 34 shows an example of a drawing die group 400 'included in the progressive die for drawing processing according to the present invention.
FIG. 35 is a view of an upper mold 600 of a side piercing mold included in a progressive metal for drawing according to the present invention, as viewed from below.
36 is a bottom view of the lower mold 700 of the side-piercing mold included in the progressive metal for drawing according to the present invention.
Fig. 37 is a side view of a side-piercing mold included in a progressive die for drawing processing according to the present invention. Fig.
38 is a view for explaining a side piercing operation process using a side-piercing mold included in a progressive metal for drawing processing according to the present invention.
Figure 39 shows examples of semi-rigid dies of a side-piercing die included in a progressive die for drawing according to the present invention.
Figure 40 shows examples of air supply holes formed in a half-ball die of a side-piercing mold included in a progressive die for drawing according to the present invention.
FIG. 41 shows actual photographs of the upper and lower molds of the side-piercing mold included in the progressive metal for drawing according to the present invention.
42 is an enlarged photograph of a part of the upper mold of the side-piercing mold included in the progressive metal for drawing processing according to the present invention.
Fig. 43 is an enlarged photograph of a half-punch die provided in the upper mold of the side-piercing die included in the progressive die for drawing according to the present invention.
44 is an enlarged photograph of a part of the lower mold of the side-piercing mold included in the progressive metal for drawing processing according to the present invention.
45 is a block diagram of a progressive mold 800 for drawing processing according to the second embodiment of the present invention.
46 is a view for explaining the style of drawing processing performed by the first drawing die group 820 of the progressive metal 800 according to the second embodiment of the present invention.
47 is a view for explaining the style of the resizing process performed by the second drawing die group 840 of the progressive mold 800 according to the second embodiment of the present invention.
Fig. 48 is a block diagram of a progressive mold 900 for drawing processing according to the third embodiment of the present invention.
49 is a view for explaining the notching and drawing processing performed by the notching mold 910 and the first drawing die group 920 of the progressive mold 900 according to the third embodiment of the present invention.
Fig. 50 is a schematic view showing the notching process, the piercing process, and the embossing process performed by the second notching mold group 930, the piercing mold 940, and the embossing mold 950 of the progressive mold 900 according to the third embodiment of the present invention. Fig. 8 is a view for explaining embossing processing.
Fig. 51 is a view for explaining the forming process performed by the forming mold 960 of the progressive mold 900 according to the third embodiment of the present invention.
52 is a view for explaining a structure of a forming mold of a progressive mold 900 according to the third embodiment of the present invention.
53 is an enlarged view of a part of the intermediate part formed by the forming mold of the progressive mold 900 according to the third embodiment of the present invention.
54 shows a state in which a portion corresponding to the upper portion of the hollow columnar component is subjected to the first bending process by the bending mold group 970 of the progressive mold 900 according to the third embodiment of the present invention.
FIG. 55 shows a state in which the portion corresponding to the upper portion of the hollow columnar component is secondarily bent by the bending mold group 970 of the progressive mold 900 according to the third embodiment of the present invention, and then caulked.

For a better understanding of the present invention, its operational advantages and features, and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which form a preferred embodiment of the invention, and the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a block diagram of a progressive mold 100 for drawing processing according to a first embodiment of the present invention. Referring to FIG. 1, the progressive mold 100 includes a notching mold group 110, a first drawing mold group 120, a pre-piercing mold 130, a second drawing mold group 150, a main-piercing mold 160, a side-piercing mold 170, a second camming mold (not shown) 180, a trimming mold 190, and a blanking mold 200. 1 are not essential, the progressive mold 100 according to the present invention may have more or fewer components. Hereinafter, the components will be described in order.

The notching mold group 110 performs notching to cut the edge of the target area to be processed into a hollow columnar part having different diameters at the upper and lower portions of the metal plate material. Such a notching process may be intended to prevent a phenomenon in which a metal sheet is drawn and drawn by a drawing process to be performed in the future.

This notching is performed on the metal plate in consideration of the size to be finally blanked so as to facilitate drawing processing. Notching of the notching mold group 110 may be performed a plurality of times or only once. That is, the notching mold group 110 may include one lower notching mold or a plurality of lower notching molds.

FIG. 2 is a view for conceptually explaining an example of a process in which the notching process is performed by the notching mold group 110 of the progressive mold 100 according to the present invention. For reference, the hatched portion in FIG. 2 means a portion where the metal plate is cut off.

2 (a) shows that primary notching is performed to perform four notches along a circle including a portion including a target region. It is possible to prevent the metal plate from being curled in the direction of the arrow by the drawing process to be performed by the first notching.

In the state of FIG. 2 (a), the second notching is performed as shown in FIG. 2 (b). The metal plate can be prevented from being curled in the arrow direction by the second notching. The direction of the arrow is a direction in which the degree of coverage by the cut portion by the first notching is weak. That is, the second notching can compensate for the fragile portion after the first notching is performed. Meanwhile, the notching process that can be performed in the progressive mold 100 according to the present invention is not limited to the notching shape or the number of times shown in Fig.

Referring again to FIG. 1, the first drawing die group 120 draws the target region a plurality of times to form the target region in a first columnar first columnar shape having an upper diameter and a length in a first target range, It can be processed into intermediate parts.

On the other hand, at the time of drawing, a very strong force is applied to the die of the drawing die included in the first drawing die group 120, so that cracks in the die, which are made of cemented carbide or alloy tool steel, There is a possibility of occurrence. There is a method of using a dividing die as a method for preventing such die cracking to prolong the life of the die, reduce die replacement or maintenance cost, and increase the processing efficiency. This will be discussed in more detail in the future.

In the drawing process, a shock line or the like is generated on the surface of the component, and the appearance of the component is often damaged. As the drawing process continues, the process uniformity is often deteriorated. In order to solve this problem, there is a method in which oil heated to a predetermined temperature is directly supplied through a die and applied to the surface of the object to be processed. This will be discussed in more detail in the future.

3 is a conceptual illustration of an example of a process of drawing processing by the first drawing die group 120 of the progressive metal 100 according to the present invention.

A plurality of drawing processes are performed in the first drawing die group 120. Fig. 3 (a) shows a state where n-times drawing processing is performed, and Fig. 3 (b) n + 1) times. In Fig. 3, the ellipse shown as a cross section is a cross section of a part to be processed, and a cross section described as a front section is a longitudinal section viewed from a front side of a part to be processed and a cross section described as a side section is a longitudinal section viewed from a side of a part to be processed.

Referring to FIG. 3, as the drawing process proceeds, the diameter of the hole decreases from W1 to W1 'at the front, the diameter of the hole decreases from W2 to W2' at the side, and the depth of the hole increases from D1 to D1 ' .

1, the first intermediate component is processed by a plurality of drawing processes using the first drawing mold group 120, and then the pre-piercing mold 130 is mounted on the lower A part of the surface is pierced, and the first intermediate component is processed into a second intermediate component of the upper and lower openings. This pre-piercing may be to pre-pierce the lower surface to be pierced in the final opening form so as to increase the machining efficiency of the lower cam forming or drawing processing and further the main-piercing to be performed in the future.

4 is a conceptual diagram illustrating an example of a process of performing pre-piercing by the pre-piercing mold 130 of the progressive mold 100 according to the present invention. Referring to FIG. 4, it can be seen that the first intermediate part in the state of FIG. 3 (b) is pierced by a part of the lower part to be processed into the second intermediate part. In Fig. 4, the hatched portion indicates that the lower piercing is performed to open the lower portion.

Referring to FIG. 1 again, a second intermediate part having an opening at a lower portion thereof is processed by the pre-piercing mold 130, and then the lower part of the second intermediate part Is laterally laterally formed so that the lower portion of the second intermediate part is processed into a third intermediate part having a lower diameter of the first target range.

The lower camming by the first camming metal mold 140 is a step of primarily working the lower part of the hollow columnar part to be finally produced, compared with the case where the lower part of the part is machined by drawing processing, It can be simple and can have a further advantage such as prevention of generation of a shock line due to drawing processing, prevention of deterioration due to work hardening or distortion of appearance, and prevention of insufficient molding of upper and lower connecting portions.

Further, the lower cam working may provide an effect of preventing the appearance of the outer appearance due to the perforated line and the connecting line necessarily formed at the time of bending and the lifting phenomenon of the abutting portion of the connecting line, have.

5 is a diagram conceptually showing a cross section of the first camming mold 140 of the progressive mold 100 according to the present invention. 5, the first cam forming mold 140 includes a guide punch 132, left and right cams 134, and right and left cam punches 136. [ The components of the first camming mold 140 shown in Fig. 5 are not essential, so that the first camming mold 140 may have more or less components than those of the first camming mold 140 shown in Fig. Hereinafter, the components will be described in order.

The guide punch 132 has a shape corresponding to the upper and lower inner diameters of the third intermediate part 131 pre-pierced by the pre-piercing mold 130. When the upper mold (not shown) Thereby lowering the pre-pierced second intermediate component. The left and right cam punch 134 descends in accordance with the descent of the upper mold to provide a force for forming the lower side surface of the second intermediate component.

The left and right cams 134 are slid on the basis of the force provided by the lowering of the left and right cam punches 136 to form the lower side surface of the second intermediate component lowered by the guide punch 132 , The third intermediate part is machined. At this time, a force applied to the part 131 by the lower part of the guide punch 132 and the lower part of the cam 134 is transmitted to the part 131 by the upper part of the guide punch 132 and the upper part of the cam 134, Is greater than the force exerted on it. Since camming is performed substantially at the lower portion and a guiding function is performed at the upper portion in order to prevent the shape of the component 131 from being excessively changed. Meanwhile, it is preferable that the lower portion of the guide punch 132 and the cam 134 also have a higher degree of contact with each other.

Although not shown in FIG. 5, after the lower side machining is performed, the guide punch 132 and the cam punch 136 are raised, and the cam is returned to the home position to the left and right for the next machining. According to this process, the lower side forming work for the second intermediate part may be performed plural times.

Fig. 6 is a view for conceptually explaining how the lower part of the hollow columnar part having different upper and lower diameters is primarily processed by the first camming mold 140 of the progressive mold 100 according to the present invention. For reference, in Fig. 6, openings formed on the lower end surfaces of the second intermediate parts are not shown for convenience of drawing or explanation or for simplification.

4 and 6, the lower part of the second intermediate part pre-pierced by the lower side is cam-formed by the first cam forming mold 140, and the width of the upper part is maintained as W1 and W2, It can be seen that the lower part has been processed with the third intermediate part whose front width is reduced to W3 and whose side width is reduced to W4. Although not shown in the drawing, the depth of the entire third intermediate part increases in relation to the depth D1 'of the second intermediate part.

Referring again to FIG. 1, the second drawing mold group 150 is formed by drawing a third intermediate component that has been subjected to the lower processing by the first cam forming metal mold 140 a plurality of times, It can be processed into a fourth intermediate part having upper and lower diameters and lengths in the target range.

Drawing by the second drawing die group 150 can be performed at least one of a lower drawing for the third part, and a drawing process for increasing the dimensional accuracy with respect to the upper, lower, and height of the third intermediate part have. On the other hand, a drawing process for increasing the dimensional accuracy of the third intermediate part is also called a resizing process.

7 is a diagram for conceptually illustrating an example of a process in which a plurality of drawing processes are performed by the second drawing die group 150 of the progressive metal 100 according to the present invention.

Referring to FIG. 7, a lower end drawing of a third intermediate part whose lower portion has been primarily processed by the first cam forming metal mold 140 is performed to process an intermediate part having an increased length, and then an upper / lower resizing Is performed and the fourth intermediate part having increased dimensional precision is processed.

Referring again to FIG. 1, the main-piercing mold 160 pierces the lower surface of the fourth intermediate component processed by the second drawing die group 150 into a final opening shape, The fifth intermediate part is machined. At this time, the lower surface of the fourth intermediate part is partially pierced by the pre-piercing mold 130 described above.

8 is a conceptual view illustrating an example of a process in which main-piercing is performed by the main-piercing mold 160 of the progressive mold 100 according to the present invention.

8, when the part of the lower surface of the fourth intermediate part is pre-pierced, the entire lower surface is pierced by the main-piercing metal 160, . On the other hand, the portion to be main-pierced may be larger than the pre-piercing hole, but not the entire lower surface of the fourth intermediate component, unlike Fig.

Referring again to FIG. 1, the side-piercing mold 170 can pierce the side surface of the fifth intermediate part. Optionally, the side-piercing mold 170 may pierce the side of the fourth intermediate component. This side-piercing process may also be an adjunct to the processing of hollow columnar parts.

The side-piercing mold 170 can simultaneously maintain left and right piercing, thereby maintaining a uniform piercing alignment. In addition, the side-piercing mold 170 has a low manufacturing cost of the mold due to the size of the mold and a low manufacturing cost of the press corresponding to the die , Scrap generated by piercing can be easily discharged. This will be discussed in more detail in the future.

9 is a view for conceptually explaining an example of a process of side-piercing processing performed by the side-piercing mold 170 of the progressive mold 100 according to the present invention. Referring to FIG. 9, it can be seen that the U-shaped piercing hole is formed on the side surface of the fifth intermediate component by the main-piercing mold 160.

Referring again to Fig. 1, the second camming mold 180 can process the fifth intermediate component into a sixth intermediate component having upper and lower diameters in the final target range. The second cam forming mold 180 may include a cam for forming an upper dimension correction cam and a camming mold for lower dimension correction. In some cases, it may include a cam forming mold capable of simultaneously performing upper and lower dimensional correction.

10 is a view for conceptually explaining how the upper and lower portions of the hollow columnar part having different upper and lower diameters are cam-formed by the second camming mold 180 of the progressive mold 100 according to the present invention . For reference, in FIG. 10, main / side-piercing holes are not shown for convenience of drawing or explanation or for simplification.

Referring to FIG. 10, it can be seen that the upper / lower camming is performed on the fifth intermediate component subjected to the main-piercing, so that the sixth intermediate component finely adjusted in dimensional accuracy is processed. The structure and operation of the second cam forming mold 180 can be easily deduced from the structure and operation of the first cam forming mold 140 described above with reference to FIG. 5, and a detailed description thereof will be omitted.

On the other hand, in general progressive drawing processing, dimensional correction of parts is also performed by drawing processing. However, in the progressive mold 100 according to the present invention, the dimensions of the parts are corrected through the cam forming process, . The dimensional correction by the cam machining is advantageous in that the dimensional correction can be performed more accurately than the drawing processing and the number of dimensional correction can be reduced.

Referring to FIG. 1 again, the trimming mold 190 is trimmed to have a height of the final target range by the sixth intermediate part, which has been processed to final dimensions so as to improve dimensional accuracy by the second cam forming mold 180 Finally, the hollow columnar component is separated.

11 shows that the hollow columnar part is finally separated from the metal plate by the trimming mold 190 of the progressive mold 100 according to the present invention. Referring to FIG. 11, it can be seen that the hollow columnar component of height H is separated from the metal plate by side trimming.

Fig. 12 shows an example of a hollow columnar part whose upper and lower diameters are different finally processed in the progressive mold 100 according to the present invention. 12, the upper and lower diameters W7 'and W8' of the front face of the hollow columnar component and the upper and lower diameters W5 'and W6' at the side are the same as those of the sixth intermediate component, H) is the height adjusted by the trimming process.

Referring again to FIG. 1, the blanking mold 200 can blank-process an area including a scrap formed along a cut surface by the trimming process in a metal plate material. The blanking process is performed in order to prevent the metal plate from being caught by the roll feeder by removing the scrap formed by trimming by the trimming mold 190 from the metal plate. Thus, a delay in operation due to the metal plate jam can be prevented.

FIG. 13 is a view for conceptually illustrating that blanking is performed by the blanking mold 200 of the progressive metal 100 according to the present invention. Referring to FIG. 13, it can be seen that the scrap is removed from the metal plate by blanking the metal plate with a width Wblank including scrap by the trimming process performed previously.

Fig. 14 shows an example of a lower mold of a progressive mold 100 according to the present invention actually manufactured. Referring to FIG. 14, the progressive metal mold 100 includes first through fifth lower mold groups SUB_1 through SUB_5. On the other hand, the components shown in FIG. 5 are not essential, so that the progressive mold 100 may have more components or fewer components. Hereinafter, the components will be described in order.

The first sub-mold group SUB_1 includes first and second notching dies for cutting edges of a target region processed into a hollow columnar part. The second sub-mold group SUB_2 includes a plurality of drawing dies for drawing the target area a plurality of times.

The third sub-mold group SUB_3 includes a pre-piercing mold for piercing a part of the lower surface of the upper opening intermediate part processed by the second sub-mold group SUB_2, a lower part of the pre- A first cam forming mold for camming the side surface, and a drawing die for lower drawing processing of the cam-shaped electronic component.

The fourth sub-mold group SUB_4 includes a plurality of drawing dies for drawing an intermediate part processed by the third sub-mold group. The fifth sub-mold group SUB_5 includes a main-piercing mold for piercing the lower surface of the intermediate part processed by the fourth sub-mold group SUB_4 into a final opening shape, a side-piercing mold for piercing the side surface of the intermediate part, A piercing mold, and at least one cam die for correcting the upper and lower dimensions of the intermediate part.

The fifth sub-mold group may further include a blanking mold for blanking the trimming mold for separating the final processed hollow columnar component from the metal plate and the metal plate separated from the hollow column so that the trimming cut surface is included. Meanwhile, the progressive metal mold 100 of FIG. 14 is merely an embodiment of the progressive metal mold according to the present invention, and the scope of the present invention is not limited thereto.

As described above, the drawing die of the progressive mold 100 according to the present invention may include a dividing die. This is to prevent die cracks which may occur when a very strong force is applied to the die of the drawing die during the drawing process. Hereinafter, with reference to Figs. 15 to 24, a drawing die including such a dividing die will be described in more detail.

Fig. 15 shows examples of the types of cracks occurring in the integrated die 210 of the conventional drawing die.

Referring to FIG. 15A, the integral die is provided with a punch through hole 211 formed of a straight line and a curved line, and a crack is generated near the vertex of the curved portion of the punch through hole 211 have. 15 (b), it can be seen that the crack occurred at the portion where the straight line and the curve of the punch through hole 211 meet. As such, the crack of the integrated die 210 is likely to occur in the punch through hole 211 at a portion vulnerable to the force exerted by the punch and the material. In the progressive mold 100 according to the present invention, such a problem can be solved by using a dividing die.

16 is a view for explaining a structure of a lower mold 300 of a drawing die included in a progressive metal for drawing processing according to the present invention. 16 (a) is a plan view of the mold 300, FIG. 16 (b) is a sectional view of the vertical central portion of the mold 300, and FIG. 16 (c) Sectional view of the transverse center portion of Fig.

17 is a view for explaining the structure of the core 320 of the lower mold 300 of the drawing die included in the progressive metal for drawing processing according to the present invention. 17 (b) is a right side view of the first lower core 321 of the core 320, and FIG. 17 (b) is a right side view of the first lower core 321 of the core 320. FIG. 17 (c) is a front view of the pre-coupling core 320, and FIG. 17 (d) is a perspective view of the first lower core 321. FIG.

18 shows that the interval between the lower cores 321 and 322 constituting the core 320 of the lower mold 300 of the drawing die included in the progressive metal for drawing according to the present invention in the pressing process is variable .

The mold 300 includes a die 310 of a first metal material having a core coupling hole 311 formed at the center thereof and a core 320 of a second metal material attached to the core coupling hole 311. [ . The second metal material may have a higher hardness than the first material but a lower elastic modulus. For example, the second metal material may be a hard metal, and the second metal material may be a carbon tool steel. In this case, the die manufacturing cost can be reduced compared to the case where the entire die is made of a cemented carbide.

The core 320 is coupled to the core coupling hole 311 and includes a plurality of lower cores 321A and 322A including grooves 321A and 322A forming a part of a punch through hole 330 formed at the center, sub-cores 321 and 322, respectively. Meanwhile, the punch through hole 330 is gradually widened downward to reduce interference by the core 320 when the punch and the material pass through the punch through hole 330.

The lower cores 321 and 322 each have a portion extending in the transverse direction. The upper and lower cores 321 and 322 extend in the transverse direction in the lower portions of the lower cores 321 and 322, respectively. And the core 320 plays a role of maintaining a stable coupled state.

In the circular state in which the core 320 is mounted on the die 310, the lower cores 321 and 322 are tightly coupled to each other (Fig. 18 (a)). However, when the punch and the material pass through the punch through hole 330, the elastic modulus of the die 310 is determined based on the force applied by the punch and the metal plate passing through the punch through hole 330 (See Fig. 18 (b)). The applied forces P1 and P2 are symmetrical forces acting from left to right.

 Then, when the punch and the metal plate exit the punch through-hole 330, the lower cores 321 and 322 are brought into the original engaged state by the force applied based on the elastic modulus of the die 310 (Fig. 18 (a)). The applied force is a symmetrical force acting inward and outward based on the modulus of elasticity of the die 310.

18, the lower cores 321 and 322 symmetrically distribute and receive the force exerted by the punch and the metal sheet passing through the punch through hole 330, and the die 310 ), Which is symmetrically accommodated by a force based on the elastic modulus of the elastic member.

The division of the die and the core in the mold according to the present invention and the division of the core into the lower core can suppress or prevent the generation of the die crack and the core crack. As a result, the mold according to the present invention can provide effects such as prolonging the life of the die, reducing the manufacturing cost of the die, and preventing work delay due to die replacement.

Meanwhile, the mold according to the present invention may be a mold for drawing processing. The mold of the double-split structure which divides the die and the core in the mold and divides the core into the lower core can be used not only for drawing but also for preventing the die from cracking in piercing, blanking and notching.

In addition, in the mold according to the present invention, the core is divided into a plurality of lower cores and then assembled. When the lower core is manufactured separately, it is possible to reduce the lapping time for the core, A reduction in the number of parts and the like may occur.

19 is a view showing various examples of cores that can be provided in a lower mold of a drawing die included in a progressive die for drawing according to the present invention.

Referring to FIG. 19 (a), it can be seen that a core split line is formed along the left and right outward directions of the vertexes of the elliptical punch through holes in the core. That is, the plurality of lower cores are divided into symmetrical structures based on the shape of the punch through holes. This also applies to FIGS. 19 (b) to 19 (d) to be discussed later.

And the forces generated by the punch and the material passing through the core through holes act symmetrically on the upper and lower sub cores in the longitudinal direction. Further, when the punch and the material are removed from the core through hole, the force acting on the lower core due to the modulus of elasticity of the die acts symmetrically in the direction opposite to the above-mentioned force. The symmetrical action of the force in accordance with such core division is the same also in Figs. 19 (b) to (f) which will be described later.

19 (b), the punch through-hole in the core has a rectangular shape, the core dividing line is formed along the direction of the vertex at the four corners of the rectangle, and the punch passing through the punch through- The force by the material acts symmetrically on the left and right subcore pairs and symmetrically on the upper and lower subcore pairs. On the other hand, the force acting by the modulus of elasticity of the die acts symmetrically in the direction opposite to the above-mentioned force.

19 (c), in the core, the punch through hole has a triangular shape, the core split line is formed in the longitudinal direction along the direction of the upper vertex, and the punch through hole passes through the core through hole The force exerted by the die is exerted symmetrically on the left and right sub-cores.

19 (d), in the core, the punch through hole has a rhombic shape, the core split line is formed along the direction of the four vertexes of the rhombus, and the punch through the core through- The forces exerted by the die as the core and material escape from the force and core through holes act symmetrically with respect to the upper left and lower right lower cores and to the lower left and right lower cores.

Referring to FIG. 19 (e), it can be seen that a circular through hole is formed in the core, and a core split line is formed in the upper and lower outer peripheries, which are closer to the outer circumference in the through hole. With this symmetrical core segmentation, the forces acting on the core during operation can act symmetrically on the left and right lower cores.

Referring to FIG. 19 (f), it can be seen that a square through hole is formed in the core, and a core split line is formed on the left and right outer peripheries which are closer to the perimeter of the through hole. With this symmetrical core segmentation, the forces acting on the core during operation can act symmetrically on the upper and lower sub-cores.

19 (a) to 19 (d), a core dividing line is formed on the basis of the shape of the punch through hole. In the examples of FIGS. 19 (e) and 19 (f) The core dividing line is formed based on the distance from the core to the outer periphery of the core. However, in another embodiment of the present invention, the core may be divided in consideration of the formation of the punch through hole and the distance from the punch through hole to the outer periphery of the core.

FIG. 20 is a view showing a part of a core for explaining another example of a criterion in which a core division line is formed in a lower mold of a drawing die included in a progressive die for drawing according to the present invention. FIG.

Referring to FIG. 20, the punch through-hole of the core is composed of upper and lower straight lines and a curve connecting the straight lines, and the curve has a predetermined radius of curvature R. FIG. If the curvature radius R of the curve is smaller than the critical radius of curvature Rth, the division curve L1 of the core may be formed along the direction of the vertex at the vertex of the curve. This is because, as the vertex becomes sharper (that is, the radius of curvature becomes smaller), it becomes vulnerable to the pressure of the punch and the material passing through the punch through hole.

However, if the curvature radius R of the curved line is larger than the critical radius of curvature Rth, the divisional curve L2 of the core is not formed at the vertex of the curved line but is formed to reach the outer periphery of the core along the long axis of the punch through- do. This is because the degree of sharpness of the vertexes is low (i.e., the radius of curvature is large) so that it can withstand the pressure of the punch passing through the punch through hole and the material.

21 is a view showing still another example of forming a core dividing line in a lower mold of a drawing die included in a progressive die for drawing processing according to the present invention.

Fig. 21 (a) shows that when a punch through hole having a complicated shape is formed in the core, the core is simply divided into left and right sides. 21 (b) shows that the core is simply divided into the horizontal and vertical directions. In the above-mentioned cases, the force applied by the punch and the material passing through the punch through-hole is distributed symmetrically in the lower cores. Therefore, the possibility of cracking of the core is lowered. On the other hand, unlike the example shown in Fig. 21, even when the punch through-hole of the core has a relatively simple shape such as an ellipse, a circle, a triangle, or a square, cracking of the core can be prevented by dividing the core into at least one of the width and the length.

22 shows examples of determining the priority order of the vertexes of the punch through holes to be a reference for core division in the lower mold of the drawing die included in the progressive metal for drawing processing according to the present invention.

22 (a) and 22 (b), it can be seen that the priority of vertex selection as a criterion for the division of the plurality of lower cores is higher as the corner angle is smaller. This is because the smaller the corner of the cabinet, the more vulnerable it is to the forces exerted by punches and materials.

22 (b), the vertexes are formed by two straight lines. In the portion where the two straight lines meet, predetermined curvature radii R1 and R2 are formed, Of the curved line. On the other hand, a curved vertex may mean a vertex formed on a curve, such as a vertex or a short axis of an ellipse.

22 (c) and 22 (d), when the angles forming the vertexes are the same, the priority of the linear vertices is higher than that of the curved vertices and the mixed vertexes. Here, the mixed vertex means a vertex formed at a point where a straight line and a curve meet as shown in FIG. 22 (d).

23 is a view showing an example of a process of coupling a die and a core in a lower mold of a drawing die included in a progressive die for drawing according to the present invention.

23 (a) shows a die 310 having a core coupling hole having a length of D1 and a core 320 having a length of D2. The size of the core coupling hole is smaller than the outer diameter of the core 320. Although not shown in detail in the drawing, the core 120 may be composed of a plurality of lower cores.

23 (b) shows a state in which the die 310 is heated in the state of FIG. 23 (a) to enlarge the core coupling hole to be larger than the outer diameter of the core 320, ) Was attached to the enlarged core coupling hole. Referring to FIG. 23 (b), it can be seen that the enlarged core coupling hole and the mounted core 320 are separated by a predetermined distance d.

FIG. 23C shows a state in which the die 320 is mechanically strongly coupled with the die 310 in the state of FIG. 23B. At this time, the length D1 "of one side of the core coupling hole may be shorter than the length of one side of the initial core coupling hole, because it is difficult for the core 320 to contract by the initial length.

The method of joining the die 310 and the core 320 described above is a heat shrinking method using heating and cooling of the die. However, in another embodiment of the present invention, another type of heat shrinking method may be used in which the core is bonded to the die according to shrinkage through cooling of the core, die mounting of the shrunk core, and expansion of the core at the normal temperature return.

Fig. 24 shows actual photographs of the lower mold 300 of the drawing die included in the progressive metal for drawing processing according to the present invention. 24 (a) is a photograph of the top of the mold 300, and FIG. 24 (b) is a photograph of the bottom of the mold 300.

24 (a) and 24 (b), it can be seen that the core split line is formed in the longitudinal direction of the punch through hole 330 elongated in the transverse direction. That is, the core 320 is divided into two lower cores on the basis of the long axis direction of the punch through hole 330. On the other hand, in Fig. 24, the core split lines are indicated by red lines. However, this is a line added along the actual core division line to help understanding, and the core division line formed in the actual product is hard to be visually confirmed.

As described above, the drawing die of the progressive mold 100 according to the present invention supplies the oil supply heated to a predetermined temperature to the metal plate to be processed, thereby deteriorating the appearance of the parts due to the shock line, and preventing the uniformity of drawing processing. . Hereinafter, with reference to FIGS. 25 to 34, a drawing die capable of realizing this feature will be described in detail.

25 is a view conceptually showing a configuration of a drawing die 400 included in a progressive die for drawing processing according to the present invention. 25, the drawing die 400 includes a drawing punch 410, a die 420, an oil feeder 430, a knockout 440, an elastic means 450, And a backing plate 460. The components of the drawing die 400 shown in Fig. 25 are not essential, so that the drawing die 400 may have more or less components than those of the drawing die 400 shown in Fig. Hereinafter, the components will be described in order.

The drawing punch 410 draws a workpiece while moving up and down. The die 420 includes a central through hole 421 corresponding to the drawing punch 410, an oil storage groove 421 formed surrounding the central through hole 421, and an inner oil path 423 . The die 420 is provided on the backing plate 460.

The central through hole 421 is a hole through which the drawing punch 410 and the object to be processed pass. In the preparing preparation step, as shown in FIG. 25, the knockout 440 blocks the central through hole 421. The oil storage groove 422 is a space in which drawing oil is accumulated, and drawing oil is supplied through an oil supply hole connected to the inner oil passage 423. For reference, a hatched portion in FIG. 25 means a space in which drawing oil can be supplied or stored.

Although an oil supply hole is formed in the bottom of the oil storage groove 422 in FIG. 25, an oil supply hole may be formed on the side of the oil storage groove. Meanwhile, the drawing oil supplied to the oil storage groove 422 may be supplied to the oil storage groove 422 as well as spring water.

The inner oil path 423 is formed inside the die 420 and is connected to the oil supply device 430. 25, the internal oil path 423 may be connected to the oil supply device 430 via an oil supply path provided in the backing plate 460.

The oil supply device 430 supplies the heated drawing oil to the oil storage groove 422 through the inner oil path 423 before the object to be processed is placed on the oil storage groove 422 in the preparing step . Then, the heated drawing oil can be sufficiently applied to the surface of the object to be processed, which is moved to the oil storage groove 422 and raised.

25, the oil supply device 430 includes a tank 431 for storing drawing oil, a heater 432 for heating the tank 431, and a heater 432 for heating the drawing oil stored in the tank 431 A valve 434 for controlling the supply amount and supply amount of pumped drawing oil, and a connecting means 435 for enhancing the connectivity of the oil path of the backing plate 460 . However, the components of the oil supply device 430 shown in Fig. 25 are not essential, so that the oil supply device 430 may have more or less components than those.

The knockout 440 is located inside the central through hole and is fastened to the bottom of the backing plate 460. The knockout 440 is connected to the upper end of the central through hole 421 so as to apply drawing oil to the surface of the object to be machined to be placed on the oil storage groove 422, The drawing oil supplied through the oil reservoir 423 can be made high in the oil reservoir groove 422.

In FIG. 25, the top of the die 420 and the knockout 440 are shown as being separate, meaning that there is a substantial tolerance between them. However, once the drawing oil is supplied, drawing oil is difficult to pass between the upper portion of the die 420 and the knockout 440 due to the adhesion of the drawing oil and the penetration of the drawing oil. That is, the tolerance can be ignored in the preparing step.

However, when the knockout 440 is punched, the drawing oil poured into the oil storage groove 422 is discharged through the center punch hole 421 along the descending drawing punch 410, And descends into the hole 421. Then, when the drawing punch 410 rises, the knockout 440 can return to a position corresponding to the preparation for punching due to the elasticity provided by the elastic means 450 provided below the knockout 440 .

As described above, the drawing die 400 according to the present invention is capable of increasing the drawing forming rate by directly supplying drawing oil heated to a predetermined temperature through the die 420 and applying the drawn oil to the surface of the object to be processed Effect can be provided.

In addition, the drawing die 400 according to the present invention can supply drawing oil heated to a predetermined temperature directly through the die 420 and applied to the surface of the object to be processed, thereby reducing shock lines occurring on the product surface Effect can be provided.

FIG. 26 is a top view of an example of a die 420 of a drawing die 400 included in a progressive die for drawing processing according to the present invention.

A circular central through hole 421 is formed at the center of the die 420, and a knockout 440 is positioned inside the die 420. The diameter of the central through hole 421 is larger than the diameter of the upper end. Unlike the upper end of the central through hole 421 through which the drawing punch 410 and the object to be machined are made, the lower part of the central through hole 421 reduces the friction or interference with the object to be machined and the punch It is for this reason.

An internal oil path 423 is formed in the die 420 in consideration of the shape of a circular central through hole 421. [ Four oil supply holes are provided symmetrically on the bottom of the oil storage groove 422 along the shape of the central through hole 421. When the oil supply hole is symmetrically formed, the drawing oil can be uniformly supplied to the oil storage groove 422.

27 is a diagram showing an example of a driving method of a drawing die 400 included in a progressive metal for drawing processing according to the present invention. FIG. 28 is a view showing a part of a process in which the driving method of the drawing die 400 shown in FIG. 27 is performed.

The heated drawing oil is supplied from the oil supply device 130 to the oil storage groove 422 of the die 420 via the internal oil path 423 of the die 420 in the state of FIG. Then, the object to be processed is moved and placed on the oil storage groove 422 (S110). Then, the heated drawing oil can be sufficiently applied to the surface of the object to be processed. The process so far can be called the preparatory stage.

FIG. 28 (a) shows a state in which the process up to now has been performed. Referring to FIG. 28A, it can be seen that the object to be processed 500 is placed on the oil storage groove 422 in a state in which the drawing oil is accumulated in the oil storage groove 422 of the die 420 . On the other hand, the drawing oil is more deeply accumulated than the oil storage groove 422 due to the oblique surface formed at the edge of the oil storage groove 422, so that even when the object to be processed is raised, Lt; / RTI > That is, in (a) of Fig. 28, the double oblique portion of the object to be formed by drawing processing is continuously exposed to the drawing oil.

In a state where the drawing oil is applied to the surface of the movable object, the drawing punch 410 descends (S120). Then, the drawing punch 410 and the object to be processed are passed through the central through hole 421 of the die 420, and the knockout 440 is interlocked with the lowering of the drawing punch 410 The drawing oil is discharged to the lower portion of the central through hole 421 while descending.

FIG. 28 (b) shows a process in which the stroke is performed. Referring to FIG. 28 (b), an object to be processed is drawn according to the descent of the drawing punch 410, and drawing oil flows through the central through hole 421 to the knockout 440 and the backing plate 460 ) Through the grooves between the first and second plates. 28 (b), it can be seen that the oil stored in the oil storage groove 422 is reduced.

Then, the control unit (not shown) determines whether the condition for terminating the drawing operation is satisfied (S140). If the condition is not satisfied (NO), steps S100 to S130 are repeated, but if the condition is satisfied (YES), drawing processing is stopped.

29 shows examples in which drawing oil is collected in the oil storage groove 422 of the die 420 of the drawing die 400 in the step of preparing the drawing die of the progressive drawing die according to the present invention.

Referring to FIG. 29 (a), it can be seen that the drawing oil is drawn deeper than the oil storage groove 422 by the oblique surface formed at the edge of the central through hole 421 of the die 420. 26, an oil storage ring is formed in which the drawing oil is accumulated more deeply than the oil storage groove along the edge of the central through hole 421 in the preparing preparation step.

29 (b), not only the edge of the central through hole 421 but also the edge of the knockout 440 is formed with an oblique surface such that the width L2 thereof is equal to the width L1 of FIG. 29 (a) It can be seen that a wider oil storage ring can be formed. That is, in the drawing die according to the present invention, it is preferable that the molding target portion to be machined is located on the oil storage ring. This is because it is ensured that the drawing oil continuously comes into contact with the substantially molded target portion.

29 (c) shows an oil reservoir ring formed by a round formed at the edge of the central through hole 421, FIG. 29 (d) shows the edge of the central through hole 421 and the knockout 440 The oil reservoir ring can be formed by the round formed at the edge of the oil reservoir ring.

The width of the oil storage ring can be increased when rounds are formed at both the center through hole 421 and the edge of the knockout 440. As described above with reference to Figures 29A and 29B, same. 29 (c) and 29 (d), it is preferable that the molding target portion to be processed be located on the oil storage rings.

As described above, by the oblique surface or round formed on at least one of the edge of the central through hole 421 of the die 420 and the edge of the knockout 440, An oil storage ring for continuously and sufficiently supplying the drawing oil to the object to be processed can be formed.

Fig. 30 shows examples in which oil supply holes are formed in the oil storage grooves 422 of the die 420 of the drawing die 400, which can be included in the progressive metal for drawing processing according to the present invention.

Referring to FIG. 30 (a), it can be seen that the oil supply holes are symmetrically located around the circular central through hole 421. Referring to FIG. 30 (b), it can be seen that the oil supply holes are symmetrically located around the elongated central through hole 421. Thus, when the oil supply holes are symmetrically disposed along the central through-hole shape, the drawing oil can be uniformly supplied to the oil storage groove. As a result, the drawing oil can be uniformly applied to the object to be processed which is placed on the oil storage groove.

Figure 31 shows examples of combinations of die 420, knockout 440, and backing plate 460 that may be embodied in a drawing die 400 included in a progressive die for drawing in accordance with the present invention.

31, a portion L3 connected to the knockout 440 at the upper end of one side of the central through hole 421 of the die 420 is connected to the knockout 440 at the upper end of the other end of the central through hole 421 It is wider than the connecting part. It can be seen that the diameter gradually increases from the central through hole 421 toward the knockout 440. This structure allows the drawing oil to be discharged more easily through the upper end portion of the central through hole 421.

31 (a), the lower end of one side of the knockout 440 is connected to the through hole of the backing plate 460, and the other end of the knockout 440 is connected to the lower end of the backing plate 460 And a groove 441 for separating the through hole from the through hole is formed. This separation is for easy discharge of the drawing oil.

31 (b), the knockout 440 is not provided with a groove for discharging the drawing oil, but the through hole of the backing plate 460 is formed larger than the knockout 440 (reference numeral 461 And the drawing oil is easily discharged.

32 is a view for explaining an example of a structure of a backing plate 460 that can be implemented in a drawing die 400 included in a progressive metal for drawing processing according to the present invention.

32, at least a part of a portion of the backing plate 460 corresponding to the central through hole 421 of the die 421 is inserted through the backing plate 460 for easy discharge of the drawing oil. It can be seen that it is inclined in the ball direction. This inclination can be determined based on the amount of drawing oil to be discharged in the viscosity drawing oil of the drawing oil and the like.

In the state shown in FIG. 32 (a), the drawing oil remaining in the central through hole 421 can be easily gathered at the center of the through hole of the backing plate 460 by the preceding drawing processes, 440) and the backing plate (460). 32 (b), the drawing oil remaining in the central through hole 421 and the drawing oil to be discharged by the drawing process are easily gathered to the center of the through hole of the backing plate 460, As shown in FIG.

33 is a view for explaining an example of the shape of the inner oil path 423 of the die 420 of the drawing die 400 included in the progressive metal for drawing processing according to the present invention.

Referring to Figure 33, a portion of the die 420 adjacent to the oil supply holes 423-1 and 423-2 in the internal oil path 423 is formed so that drawing oil is directed to the central through- D2 in the direction of the central through-hole 421. [0064] As shown in FIG. This is a structure for supplying drawing oil intensively to the molding target portion of the object to be processed since the molding target portion in the drawing object is generally located near the central through hole 421.

Fig. 34 shows an example of a drawing die group 400 'included in the progressive die for drawing processing according to the present invention.

The drawing mold group 400 'of FIG. 34 includes a plurality of lower molds 400-1 to 400-5 which can directly supply the heated oil to the object to be processed through the die, like the drawing mold 400 described above . Therefore, in each drawing processing step performed in the drawing mold group 400 ', it is possible to uniformly provide the object to be processed with the heated oil, so that the molding can be easily performed at each processing step (that is, , And it is possible to reduce the occurrence of shock lines on the surface of the object to be processed which may occur in each drawing processing step.

As described above, the side piercing mold of the progressive mold 100 according to the present invention simultaneously performs left and right piercing so that uniform piercing alignment can be maintained, and the mold manufacturing cost due to the size of the mold, Not only the production cost of the corresponding press is low but also the scrap generated by the piercing can be easily discharged. Hereinafter, with reference to FIGS. 35 to 44, a side piercing mold capable of realizing this feature will be described in detail.

FIG. 35 is a view of an upper mold 600 of a side piercing mold included in a progressive metal for drawing according to the present invention, as viewed from below. 36 is a bottom view of the lower mold 700 of the side-piercing mold included in the progressive metal for drawing according to the present invention. Fig. 37 is a side view of a side-piercing mold included in a progressive die for drawing processing according to the present invention. Fig.

The upper mold 600 and the lower mold 700 shown in the drawings are not essential and the upper mold 600 and the lower mold 700 may have more or less components than the upper mold 600 and the lower mold 700, It is possible. Hereinafter, the components will be described in order.

The upper mold 600 is equipped with a half hollow type die 610 and cam punches 620 to 623. More specifically, the semi-spherical die 610 may be fixed by a punch fastening plate 650 and a back plate 640. The punch fixing plate 650 and the back plate 640 may serve as a stripper.

The half-punch die 610 is provided at the center of the upper mold 600 and includes left and right punch through holes 612 and 613 symmetrically formed on the left and right sides of the body, And a lower hollow 611 for scrap discharge formed up to a height reaching the holes 612 and 613. Since the hollow is formed only in the lower portions of the left and right punch through holes 612 and 613, the upper portion of the semi-spherical die 610 can have stronger mechanical characteristics than the lower portion.

The semi-hollow die 610 has at least one air supply hole 611 for injecting compressed air for discharging scrap generated by the side piercing operation to the lower hollow 611 through the lower hollow 611, (614). The supply of compressed air to the air supply hole 614 may be performed through a compressed air supply path 660 provided in the upper mold 600. According to this compressed air injection mechanism, the mold for side processing according to the present invention can more easily discharge the scrap generated by the side piercing.

35 to 37, only one air supply hole is included in the semi-spherical die 610, but each of the semi-spherical die 610 is smaller than the lower hollow 611, And a plurality of air supply holes for injecting compressed air from the upper surface of the mold die 610 to the lower hollow 611 may be included.

Preferably, the sum of the major axis lengths of the plurality of air supply holes is smaller than the major axis length of the lower hollow. The smaller the size of the air supply hole, the higher the strength of the upper portion than the strength of the lower portion where the lower hollow is formed. With this structural feature, mechanical stability can be ensured and the durability of the mold can be enhanced.

The cam punches 620 to 623 may be lowered along with the lowering of the upper mold 600 to provide a force for side piercing to the lower mold 700. The cam punches 620 to 623 may be fixed to a punch holder 630. Meanwhile, between the punch holder 630 and the punch fixing plate 650 and the back plate 640, they may be connected by elastic means such as a spring.

A left sliding module 710, a right sliding module 720, an elastic means 730, and a lower die 740 are formed on the lower mold 700. Each of the left and right sliding modules 710 and 720 is provided symmetrically on the left and right sides of the lower mold.

More specifically, the left and right sliding modules 710 and 720 are mounted on sliding grooves provided in the lower mold 700, and the left and right side sliding modules 710 and 720 are moved in the sliding groove by the left and right cam fins 620 to 623 It can reciprocate only in the left / right direction by the provided force and the elastic force provided by the elastic means 730, and can not move in the vertical direction. This structure can reduce the likelihood of alignment being lost even after multiple side piercing.

The left and right sliding modules 710 and 720 are coupled with corresponding piercing punches 713 and 723 of the left and right piercing punches. The left sliding module 710 is formed with cam punch receiving structures 711, 712, 721, and 722 at positions corresponding to the cam punches 620 to 623.

The left and right sliding modules 710 and 720 receive a force applied by the lowering of the left and right cam punches 620 to 623 through the cam punch receiving structures 711, 712, 721, and 722, The left and right piercing punches 713 and 723 are slid symmetrically with respect to the lower punch through holes 612 and 623 through the machining object and the left and right punch through holes 612 and 623 in which the half- 611 through the side piercing operation. That is, the piercing of the left and right piercing molds according to the present invention is performed not by the movement of the piercing punch (or the punch module) but by the left and right reciprocating motion of the sliding module mounted on the groove and movable only in the left and right direction.

The elastic means 730 is connected to the left and right sliding modules 710 and 720 and is connected to the left and right cam punches 620 to 623 based on the force provided by the left and right cam punches 620 to 623 as the upper mold 600 is lowered. . At this time, side piercing to the object to be processed is performed. Then, when the force provided by the left and right cam punches is removed as the upper mold 600 is lifted, the elastic means 730 restores the left and right sliding modules 710 and 720 to the original state .

The lower die 740 is provided at the center of the lower die. In the lower die 740, a workpiece having the semi-hollow die 610 inserted therein is inserted into the upper portion, and scrap discharged from the semi-hollow die 610 is discharged to the lower portion. That is, the lower die 740 has a hollow structure and an upper and lower open structure.

Left and right side piercing punches 713 and 723 guide holes 741 and 742 are formed on left and right sides of the lower die 740 to reciprocate left and right to perform a side piercing operation. One end of the left and right piercing punches 713 and 723 is inserted into the guide holes 741 and 742 before the piercing is performed. The left and right piercing punches 713 and 723 move along the guide holes 741 and 742 to pierce the left and right sides of the object to be processed. After performing the piercing, the left / right piercing punches 713 and 723 return to the initial state along the guide holes 741 and 742. [

As described above with reference to FIG. 35 to FIG. 37, since the mold for side piercing according to the present invention inserts strong air through the air supply hole, the scrap can be easily discharged, It is easy to fit both side piercing alignments and the cost of manufacturing side piercing punches, dies and molds can be reduced.

 38 is a view for explaining a side piercing operation process using a side-piercing mold included in a progressive metal for drawing processing according to the present invention.

38 (a) shows a waiting state for performing side piercing. 38A, the lower mold 700 having the upper mold 600 and the left / right sliding modules 710 and 720 provided with the half-punch die 610 and the cam punches 620 and 622, Are spaced apart from one another.

38 (b) shows a side piercing performing state. When the upper mold 600 descends, the semi-rigid die 610 is inserted into the lower die 740 together with the object to be processed. Then, the cam punches 620 and 622 are lowered to apply force to the cam punch receiving structures 712 and 722. Then, the left / right side sliding modules 710 and 720 are simultaneously slid symmetrically, and left / right side piercing is simultaneously performed.

Then, compressed air is injected from the air supply hole 614 provided in the half-cavity die 610 to the lower hollow 611 from the upper half of the semi-hollow die 610. Then, scrap can be discharged from the lower hollow 611 more easily. Then, when the upper mold 600 is lifted, the state of the mold is restored to the original state by the elastic means 730 as shown in FIG. 38 (a).

Figure 39 shows examples of semi-rigid dies of a side-piercing die included in a progressive die for drawing according to the present invention.

At least one air supply hole 614 is formed in a rectangular parallelepiped-type semi-hollow die. The air supply hole 614 is formed to reach the lower hollow 611 from the upper surface of the semi-hollow die 610. In the example of FIG. 39 (a), the lower hollow 611 has a rectangular parallelepiped shape having a constant width. In the example of FIG. 39 (b), the lower hollow 611 has a rectangular column shape with a wider width 39 (c), the lower hollow 611 may have an elliptical column shape in which the width thereof is inserted downward. On the other hand, the width of the lower hollow 611 becomes wider as it goes down to facilitate scrap discharging and to eliminate unnecessary interference between the object to be processed and the piercing punch which may occur in the piercing process.

39, each of the air supply holes 614 is smaller than the lower hollow 611, and the sum of the longitudinal lengths of all the air supply holes 614 formed in the semi-spherical die 610 Is smaller than the long axis length of the lower hollow (611). This is to reduce the strength drop by the air supply hole 614 formed in the upper part of the half-die 610. Since the strength of the semi-spherical die 610 due to the larger air supply hole 614 must be reduced.

Figure 40 shows examples of air supply holes formed in a half-ball die of a side-piercing mold included in a progressive die for drawing according to the present invention.

Referring to Fig. 40, there is shown an example in which air supply holes are formed in a semi-spherical die 610 having a rectangular, circular or elliptical upper surface. It can be seen that the air supply holes are formed symmetrically with respect to each other on the upper surface of the semi-spherical die 610. This is to allow the scrap to be easily discharged through the lower hollow 611 of the semi-spherical die 610 through symmetrical compressed air injection.

FIG. 41 shows actual photographs of the upper and lower molds of the side-piercing mold included in the progressive metal for drawing according to the present invention.

A semi-rigid die 610 is provided at the center of the upper mold 600 and cam punches 620 to 623 are arranged symmetrically around the die. The left and right sliding modules 710 and 720 are provided symmetrically in the sliding groove in the lower mold 700. A lower die 740 is provided at a position corresponding to the half mold die 610, At positions corresponding to the punches 620 to 623, cam punch receiving structures 711, 712, 721, and 722 are formed.

The left sliding modules 710 are connected to each other by two elastic means 730. When the force is transmitted to the cam punch receiving structures 711, 712, 721, and 722 by the downwardly moving cam punches 620 to 623, the elastic means 730 contracts while the left and right sliding modules 710 And 720 move to the center while side piercing is performed. After the piercing is performed, the left and right sliding modules 710 and 720 are returned to the original state by the elastic means.

42 is an enlarged photograph of a part of the upper mold of the side-piercing mold included in the progressive metal for drawing processing according to the present invention. Fig. 43 is an enlarged photograph of a half-punch die provided in the upper mold of the side-piercing die included in the progressive die for drawing according to the present invention.

The cam punch symmetrically provided in the upper mold 600 has a cam slope in the center direction for transmitting the force for sliding to the cam punch receiving structure. Although not shown in the drawing, the lower mold 700 is provided with a cam punch receiving structure having an inclination corresponding to the inclination of the cam punch.

On the other hand, a lower hollow for scrap discharge is provided below the half-die 610. Further, a left punch through hole 612 is formed in a side surface of the half-punch die 610. On the opposite side, another right punch through hole 613 is formed although not shown in the photograph. The lower hollow 611 and the punch through holes 612 and 613 are connected to each other. The lower hollow 611 from the upper surface of the semi-hollow die 610 is connected by at least one air supply hole.

44 is an enlarged photograph of a part of the lower mold of the side-piercing mold included in the progressive metal for drawing processing according to the present invention.

In the lower mold 700, the left and right sliding modules 710 and 720 are connected to each other via elastic means 730. One end of the piercing punches 713 and 723 attached to the left and right sliding modules 710 and 720 is provided at the center of the lower mold 700. The piercing punches 713 and 723, It is inserted into the punch guide.

45 is a block diagram of a progressive mold 800 for drawing processing according to the second embodiment of the present invention. 45, the progressive mold 800 includes a notching mold group 810, a first drawing mold group 820, a pre-piercing mold 830, a second drawing A mold group 840, a main-piercing mold 850, a side-piercing mold 860, a cam forming mold 870, a trimming mold 880, and a blanking mold 890. 45 are not essential, the progressive mold 800 according to the present invention may have more or fewer components. Hereinafter, the components will be described in order.

The notching mold group 810 cuts the edge of the target area to be processed into a hollow columnar part having different diameters at the upper and lower sides in the metal plate to be processed. The notching mold group 810 may be the same as or similar to the notching mold 100 of the progressive mold 100 according to the first embodiment of the present invention. Therefore, detailed description thereof will be omitted.

The first drawing die group 810 draws the target region a plurality of times to process the target region into a columnar first intermediate part having an upper opening diameter and an upper and lower diameter of the first target range. That is, the basic shape of the hollow columnar part having different upper and lower diameters is prepared by drawing of the first drawing die group 810. This is different from the progressive mold 100 according to the first embodiment of the present invention in that the lower part of the intermediate part is formed by the cam forming mold 140 for the first time.

The first drawing mold group 810 may include at least one first-style drawing-processing mold and at least one second-style drawing-processing mold. Here, the drawing of the first style is to process a simple columnar part of the upper opening type, and the drawing of the second style draws the lower part of the simple upper opened part drawn in the first style, As shown in Fig.

46 is a view for explaining the style of drawing processing performed by the first drawing die group 820 of the progressive metal 800 according to the second embodiment of the present invention.

Referring to FIG. 46, it can be seen that the punches used in the first-style drawing processing have the same diameters at the upper and lower portions, and the intermediate parts processed accordingly have the same diameters at the upper and lower portions. The upper and lower diameters of the upper and lower parts are different and the diameters of the upper and lower parts of the intermediate parts processed are different from each other.

At least one of the drawing dies included in the first drawing die group 820 may be a die including the dividing die as described with reference to Figs. 15 to 24 above. This is the same for the second drawing die group 840 to be discussed later. Therefore, like the progressive mold 100 according to the first embodiment, the progressive mold 800 according to the second embodiment of the present invention also prevents die cracking, prolongs the life of the die, and reduces die replacement or maintenance costs And at the same time, it is possible to provide an effect of increasing the processing efficiency.

At least one of the drawing dies included in the first drawing die group 820 may have the heated oil supply function as described with reference to FIGS. 25 to 34. FIG. This is the same for the second drawing die group 840 to be discussed later. Therefore, the progressive mold 800 according to the second embodiment of the present invention can prevent the appearance of the parts from being damaged as in the progressive mold 100 according to the first embodiment, It is possible to provide an effect of preventing the processing uniformity from being inhibited.

The pre-piercing metal mold 830 pierces a part of the lower surface of the first intermediate part processed by the first drawing die group 820 to form the first intermediate part as a second intermediate part Processing. The pre-piercing mold 830 may be the same as or similar to the pre-piercing mold 130 of the progressive mold 100 according to the first embodiment of the present invention. Therefore, detailed description thereof will be omitted.

After the second intermediate part pierced with a part of the lower surface is machined, the second drawing tool group 840 draws the second intermediate part a plurality of times to form the second intermediate part in the second target range It can be processed into a third intermediate part having upper and lower diameters and lengths.

The second drawing die group 840 may include at least one drawing die for drawing the second intermediate part and processing the lower shape to be close to the lower part of the final hollow columnar part. The second drawing die group 840 may include at least one drawing die for improving the dimensional accuracy of at least one of the upper and lower portions and the height of the intermediate product through the drawing process. Drawing processing to increase the precision of such parts is called resizing processing.

47 is a view for explaining the style of the resizing process performed by the second drawing die group 840 of the progressive mold 800 according to the second embodiment of the present invention. Fig. 47 (a) is for explaining the upper resizing process, and Fig. 47 (b) is for explaining the lower resizing process.

Referring to FIG. 47, a punch having an internal shape of an intermediate part is used for the resizing processing. The die is not shown for convenience of explanation. The gap D1 between the punch and the upper part of the intermediate part is smaller than the clearance D2 between the lower part of the punch and the intermediate part when the upper resizing is performed, (D3) is larger than the gap (D4) between the punch and the lower part of the intermediate part.

This may be the same in the resizing process in the progressive mold 100 according to the first embodiment of the present invention. These gap differences can be similarly applied in drawing processing to create top and bottom shapes. For example, in the upper drawing, the upper gap may be small, and in the lower drawing, the lower gap may be small. This also applies to the progressive mold 100 according to the first embodiment of the present invention and the progressive mold 900 according to the third embodiment of the present invention to be discussed later.

The main-piercing mold 850 may pierce the lower surface of the third intermediate piece in a final opening to process the third intermediate piece into a fourth intermediate piece. The main-piercing mold 850 may be the same as or similar to the main-piercing mold 160 of the progressive mold 100 according to the first embodiment of the present invention. Therefore, detailed description thereof will be omitted.

The side-piercing mold 860 can pierce the side surface of the fifth intermediate part. Optionally, the side-piercing mold 170 may pierce the sides of the third or fourth intermediate part. This side-piercing process may also be an adjunct to the processing of hollow columnar parts.

Meanwhile, the side-piercing mold 860 may be a mold including the side-piercing mold 860 previously described with reference to FIGS. Therefore, in the progressive mold 800 according to the second embodiment of the present invention, the side piercing mold of the progressive mold 100 according to the present invention has the left and right piercing as in the progressive mold 100 according to the first embodiment. It is possible to maintain a uniform piercing alignment and to reduce the manufacturing cost of the mold due to the mold size and the manufacturing cost of the press corresponding to the mold and to easily discharge the scrap generated by the piercing Effect can be provided.

The cam forming mold 870 can mold the upper and lower side surfaces of the fourth intermediate component and process the fourth intermediate component into a fifth intermediate component having the upper and lower diameters of the final target range. The trimming mold 880 trims the fifth intermediate component so as to have a height of the final target range, and finally separates the hollow columnar component. The blanking mold 890 blankets an area including a scrap formed along the cut surface by the trimming process.

Each of the cam forming mold 870, the trimming mold 880 and the blanking mold 890 includes the second cam forming mold 180 of the progressive mold 800 according to the first embodiment of the present invention, (190), and blanking mold (200). Therefore, a detailed description thereof will be omitted.

Fig. 48 is a block diagram of a progressive mold 900 for drawing processing according to the third embodiment of the present invention. 48, the progressive mold 900 includes a notching mold group 910, a first drawing mold group 920, a second notching mold group 930, a piercing mold 940, forming metal mold 950, a bending mold group 970, a second drawing mold group 980, a main-piercing mold 990, a cam forming mold 1000, a trimming mold 1010, And a blanking mold 1020. As shown in Fig.

48 are not essential, the progressive mold 900 according to the present invention may have more or less components than those of the present invention. Hereinafter, the components will be described in order.

The notching mold group 910 cuts the edge of the target area to be processed into a hollow columnar part having different diameters at the upper and lower sides in the metal plate to be processed. The notching mold group 910 may be the same as or similar to the notching mold 100 of the progressive mold 100 according to the first embodiment of the present invention. Therefore, detailed description thereof will be omitted.

The first drawing die group 910 draws the target area a plurality of times to process the target area into an upper opening-like columnar first intermediate part having a lower diameter and a length of the first target area. That is, the basic shape of the lower part of the hollow columnar part having different upper and lower diameters is prepared by drawing of the first drawing die group 910. This is different from the progressive mold 100 according to the first embodiment of the present invention in that the lower part of the intermediate part is formed by the cam forming mold 140 for the first time.

49 is a view for explaining the notching and drawing processing performed by the notching mold 910 and the first drawing die group 920 of the progressive mold 900 according to the third embodiment of the present invention.

Referring to Figure 49 (a), it can be seen that the metal plate is cut along the edge of the target area to be processed into a hollow columnar part. 49 (b), when a drawing process is performed on the central portion of the target region, the metal plate material of the target region is inserted, but the metal plate material outside the target region is attached by the notched portion It can be seen that it does not enter.

At least one of the drawing dies included in the first drawing die group 920 may be a die including the dividing die discussed above with reference to Figs. 15 to 24. This is the same for the second drawing die group 980 to be discussed later. Therefore, like the progressive mold 100 according to the first embodiment, the progressive mold 900 according to the third embodiment of the present invention also prevents die cracking, prolonging the life of the die, and reducing die replacement or maintenance costs And at the same time, it is possible to provide an effect of increasing the processing efficiency.

At least one of the drawing dies included in the first drawing die group 820 may have the heated oil supply function as described with reference to FIGS. 25 to 34. FIG. This is the same for the second drawing die group 980 to be discussed later. Therefore, the progressive mold 900 according to the third embodiment of the present invention can prevent the appearance of the parts from being damaged as in the progressive mold 100 according to the first embodiment, It is possible to provide an effect of preventing the processing uniformity from being inhibited.

Referring again to FIG. 48, the second notching mold group 930 includes a second intermediate component that cuts the edge of the bend target area to form the upper portion of the hollow columnar component by bending, at the first intermediate component Processing. The piercing metal mold 940 is cut by the first notching mold group 910 so as to prevent the metal plate from being rolled up when the upper portion of the hollow columnar part is bent at the second intermediate part in the future Cut the outside of the part.

The embossing mold 950 embosses the portion of the second intermediate component to be the upper portion of the hollow columnar component. The embossing process is to make protrusions that fit into the parts to be inserted into the hollow columnar boommat in the future. Meanwhile, cutting by the second notching mold group 930 and embossing by the embossing mold 950 may be an ancillary process in the manufacturing process of the hollow columnar part.

The component binding function of the embossing part is performed by a piercing hole processed by the side-piercing dies 170 and 860 of the progressive dies 100 and 800 according to the first and second embodiments of the present invention . In some cases, the progressive mold 900 according to the third embodiment of the present invention may include a side-piercing mold.

Fig. 50 is a schematic view showing the notching process, the piercing process, and the embossing process performed by the second notching mold group 930, the piercing mold 940, and the embossing mold 950 of the progressive mold 900 according to the third embodiment of the present invention. Fig. 8 is a view for explaining embossing processing.

50A shows a state in which a portion to be formed with the upper portion of the hollow columnar component by the second notching mold group 930 is cut in a state where drawing is performed by the first drawing die group 910 . 50B shows that the piercing process including the portion cut by the first notching mold group 910 by the piercing mold 940 is performed. 50 (c) shows that embossing of a rectangular shape is performed in the embossing process on the upper portion of the hollow columnar component.

Referring again to FIG. 48, the forming mold 960 forms a portion corresponding to the inclined surface connecting the upper and lower portions of the hollow columnar component, in the second intermediate component processed by the second notching mold group, Thereby processing the third intermediate part. Such inclined surface forming can be performed by forging the inclined surface using a punch. In the future, when the upper portion of the hollow columnar component is bent, the bending process can be easily performed by the foaming processed slope, and the bending forming efficiency can also be increased.

Fig. 51 is a view for explaining the forming process performed by the forming mold 960 of the progressive mold 900 according to the third embodiment of the present invention. Referring to FIG. 51, it can be seen that the forming die 960 has formed an inclined surface connecting upper and lower portions of the hollow columnar component.

52 is a view for explaining a structure of a forming mold of a progressive mold 900 according to the third embodiment of the present invention. Referring to FIG. 52, it can be seen that the punch is forged on an inclined surface (a portion indicated by a dotted circle) connecting the upper and lower portions of the hollow columnar component.

53 is an enlarged view of a part of the intermediate part formed by the forming mold of the progressive mold 900 according to the third embodiment of the present invention. Referring to FIG. 53, it can be seen that the forming process is performed along the inclined surface (hatched portion) connecting the upper and lower portions of the hollow columnar component in the intermediate part. For reference, the intermediate part is formed with structures B1 and B2 for binding the upper part of the hollow columnar part when it is bent in the future.

Referring again to FIG. 48, the bending mold group 970 bends the bending target area in the third intermediate product in which the upper and lower connecting parts of the hollow columnar part are processed by the forming mold, So that the fourth intermediate part is processed.

The bending mold group 970 includes a first bending mold for primarily bending a portion corresponding to the upper portion of the hollow columnar component in the third intermediate component, a first bending mold for bending a portion of the hollow columnar component And a caulking die for caulking a joint portion of the second bent intermediate member by applying a pressure to the second bending mold. On the other hand, the secondary bending mold may be a mold for performing bending processing with a cam.

54 shows a state in which a portion corresponding to the upper portion of the hollow columnar component is subjected to the first bending process by the bending mold group 970 of the progressive mold 900 according to the third embodiment of the present invention. FIG. 55 shows a state in which the portion corresponding to the upper portion of the hollow columnar component is secondarily bent by the bending mold group 970 of the progressive mold 900 according to the third embodiment of the present invention, and then caulked.

Referring to FIG. 54, when the portion corresponding to the upper portion of the hollow columnar component is first bent, it can be seen that the upper water connection structure B2 protrudes. 55, secondary bending is performed in the state of Fig. 54, so that the male connection structure B2 is fitted to the female connection structure B1, and two lines of caulking It can be seen that the machining has been performed.

Referring again to FIG. 48, the second drawing mold group 980 is formed by drawing a fourth intermediate component processed by the bending mold group 970 a plurality of times to form the second intermediate component in the second target range A fifth intermediate part having upper and lower diameters and lengths. The second drawing die group 970 may include at least one drawing die for increasing the dimensional accuracy of at least one of the upper and lower portions and the height of the intermediate product through the drawing process. Drawing processing to increase the precision of such parts is called resizing processing.

The main-piercing mold 990 pierces the lower surface of the fifth intermediate component processed by the second drawing die group 980 into a final opening shape, and the fifth intermediate component is processed into a sixth intermediate component . The main-piercing mold 980 may be the same as or similar to the main-piercing mold 160 of the progressive mold 100 according to the first embodiment of the present invention. Therefore, detailed description thereof will be omitted.

The cam forming mold 1000 molds the upper and lower side surfaces of the sixth intermediate component machined by the main-piercing mold 990 to form the sixth intermediate component into a seventh intermediate component having upper and lower diameters in the final target range . The trimming mold 1010 trims the seventh intermediate part so as to have a height of the final target range, and finally separates the hollow columnar part. The blanking mold 1020 blankets a region including a scrap formed along the cut surface by the trimming process.

Each of the cam forming mold 1000, the trimming mold 1010 and the blanking mold 1020 includes a second cam forming mold 180 of the progressive mold 800 according to the first embodiment of the present invention, (190), and blanking mold (200). Therefore, a detailed description thereof will be omitted.

In the foregoing, the first and second aspects of the present invention have been described. And the progressive dies for drawing processing 100, 800, and 900 according to the third embodiment, the hollow columnar parts having different diameters at the upper and lower sides are processed. However, there are differences in the mechanism in which the used columnar parts are processed according to the embodiments as described below.

In the progressive mold 100 according to the first embodiment of the present invention, the upper part of the hollow columnar part is processed by drawing processing but the lower part is processed by cam forming. The progressive mold 800 according to the second embodiment of the present invention processes both the upper and lower portions of the hollow columnar part by drawing processing. In the progressive mold 900 according to the second embodiment of the present invention, the lower part of the hollow columnar part is processed by drawing processing, and the upper part is processed by bending processing. However, all of the progressive dies 100, 800, and 900 can use a drawing die that includes a split die, a drawing die that has a heated oil supply structure, and a symmetrical side piercing die for processing hollow columnar components have.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: Progressive mold 110: Notching mold group
120: first drawing die group 130: pre-piercing mold
140: first cam forming mold 150: second drawing mold group
160: main-piercing mold 170: side-piercing mold
180: second cam forming mold 190: trimming mold
200: Blanking mold 800, 900: Progressive mold

Claims (6)

A notching metallic mold group which cuts off edges of a target region to be processed into hollow columnar parts having different diameters at upper and lower portions of a metal plate material;
A first drawing mold group for drawing the target region a plurality of times to process the target region into a first columnar first intermediate member having an upper and lower diameters and a length in a first target range;
A pre-piercing mold for piercing a part of the lower surface of the first intermediate part to process the first intermediate part into a second intermediate part of an upper and lower sphere;
A second drawing tool group for drawing the second intermediate part a plurality of times to process the second intermediate part into a third intermediate part having upper and lower diameters and lengths in a second target range;
A main-piercing mold for piercing the lower surface of the third intermediate part into a final opening shape to process the third intermediate part into a fourth intermediate part; And
Molding the upper and lower side surfaces of the fourth intermediate component and machining the fourth intermediate component into a fifth intermediate component having upper and lower diameters of a final target range,
Wherein at least one drawing die included in the first drawing die group includes:
A die of a first metal material having a core coupling hole formed at the center thereof; And
Each of which has a second metal material having a hardness higher than that of the first material but lower in elastic modulus and includes grooves constituting a part of a punch through hole formed at the center thereof, The core comprising a plurality of sub-cores,
The plurality of sub-
Wherein the punch and the metal plate are spaced apart from each other by a distance corresponding to a modulus of elasticity of the die based on a force exerted by the punch and the metal plate passing through the punch through hole and when the punch and the metal plate exit the punch through hole, And the original state is restored according to the coefficient. The apparatus according to claim 1, wherein the progressive drawing die comprises:
A trimming die for trimming the fifth intermediate part to a height of a final target range and finally separating the hollow columnar part; And
Further comprising a blanking mold for blanking an area including a scrap formed along the cut surface by the trimming process. The apparatus according to claim 1, wherein the progressive metal for drawing comprises:
A left and right punch through hole formed symmetrically on the left and right sides of the body and a lower hollow for discharging scrap formed up to at least a height from the lower surface to the left and right punch through holes, A half hollow die inserted into the third or fourth intermediate part as the mold is lowered;
A left and right cam punch which is provided on the upper mold and descends according to the descent of the upper mold to provide a force for side piercing; And
Each of which is symmetrically provided on the left / right side of the lower mold,
A corresponding piercing punch among the left and right piercing punches is coupled,
Right piercing punch is slid symmetrically at the same time based on the force applied by the lowering of the left and right cam punches so that the left and right piercing punches are pushed into the third or the third intermediate part, Further comprising a side piercing mold including a left / right sliding module that performs a side piercing operation that penetrates through the punch through hole to the lower hollow. 4. The mold of claim 3, wherein the half-
And at least one air supply hole for injecting compressed air for discharging the scrap generated by the side piercing operation through the lower hollow to the lower hollow. The apparatus according to claim 1, wherein at least one drawing die included in the first and second drawing mold groups comprises:
A drawing punch reciprocating up and down;
A die including a central through hole corresponding to the drawing punch, an oil storage groove formed surrounding the central through hole, and an inner oil path;
An oil supply device for supplying drawing oil to the oil reservoir through the internal oil passage before the object to be processed is placed on the oil reservoir in the preparing step; And
And a second through hole located inside the central through hole,
The drawing oil supplied through the inner oil path is connected to the upper end of the central through hole so that the drawing oil is applied to the surface of the object to be processed to be put on the oil storage groove, So,
The drawing oil is lowered into the central through hole along the lowering drawing punch so that the drawing oil accumulated in the oil storage groove is discharged below the central through hole, and when the drawing punch is elevated, And a knockout for returning to the original position to a position corresponding to the step. 6. The method according to claim 5,
By a round formed on at least one of the edge of the central through hole and the edge of the upper end of the knockout,
And an oil storage ring is formed deeper than the oil storage groove along an edge of the central through hole.

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