KR100479917B1 - Press which carries out forming and piercing process simult aneously and manufacturing method of cooling plate of heatexchangor by using the same - Google Patents

Abstract

A forming and piercing process co-molding mold is disclosed. The co-molding die is provided to be movable up and down, and includes a two-stage punch having a piercing portion for crimping and punching a material and a burring portion for pressing and bending the periphery of the material, and for supporting the material. And a lower main body having a punch insertion hole into which a hole is inserted, a die provided to be liftable from the punch insertion hole, and elastic means for elastically biasing the die in an upward direction. Such a forming and piercing process co-molding mold has the advantage that the number of dies required for the process is reduced, which significantly reduces the cost of manufacturing parts.

Description

Press which carries out forming and piercing process simult aneously and manufacturing method of cooling plate of heatexchangor by using the same}

The present invention relates to a forming and piercing process co-molding die and a method for manufacturing a cooling plate for a heat exchanger using the same.

1A and 1B illustrate a cooling plate for a heat exchanger used in a general industrial heat exchanger stream.

As shown in the cooling plate 100 for the heat exchanger, a plurality of burring holes 101 are formed in a regular thin plate. The burring hole 101 is provided with a hole formed in a predetermined shape and a burr 102 bent in a direction perpendicular to the periphery of the hole. The end 102a of the burr 102 is bent outward in a curved shape having a predetermined radius of curvature.

2 illustrates a heat exchanger made by stacking a plurality of cooling plates 100 as described above. As illustrated, in order to manufacture the heat exchanger, a plurality of cooling plates 100 having a plurality of burring holes 101 formed as shown in FIG. 1 are stacked side by side at predetermined intervals, and the burring holes 101 of the cooling plates 100 are stacked. ) Install a plurality of pipes (200) through.

In such a heat exchanger, heat exchange is performed between the first fluid B flowing into the pipe 200 and the second fluid C flowing between the cooling plate 100. Therefore, a constant gap must be maintained between each cooling plate 100, but it is the burr 102 of the burring hole 101 to maintain this gap. That is, the distance between each cooling plate 100 corresponds to the length of the burr 102.

In order to manufacture the cooling plate 100 having the above-described configuration, a piercing process for forming a plurality of holes in the thin metal plate, a forming process for forming a burr by bending a certain portion around the hole at a right angle, and the end of the bur There is a need for a curing process to produce a desired curve.

In order to carry out these several processes, progressive molds have conventionally been used. However, since progressive molds are expensive to manufacture, they are not economically expensive due to an increase in parts manufacturing cost unless they are mass-produced parts (e.g., at least 100,000 cooling fins used for car writer). This occurred.

The present invention was created to solve the above problems, and provides a simultaneous molding mold having a structure capable of simultaneously performing a piercing process and a forming process so as to minimize the number of molds required for manufacturing parts. Its purpose is to.

Another object of the present invention is to provide a cooling plate manufacturing method for a heat exchanger having a step of simultaneously performing a piercing process and a forming process so as to minimize the number of processes required for manufacturing a part.

Forming and piercing process co-molding mold according to the present invention for achieving the above object, is installed to be elevated, and provided with a piercing portion for pressing and punching the material and a burring portion for pressing and bending around the hole of the material. A two-stage punch, a lower body having a punch insertion hole into which the two-stage punch is inserted, a die provided to be elevated in the punch insertion hole, and elastic means for elastically biasing the die in an upward direction. Characterized in that provided.

And it is preferable that a step is formed at a predetermined portion of the two-stage punch, the piercing part is formed at the bottom centering on the step, and the burring part is formed at the bottom centering on the step.

The radius of curvature of the fillet portion of the piercing portion is 0.05 or less, and the radius of curvature of the fillet portion of the burring portion is preferably 1.00 or more.

In addition, it is preferable that the clearance between the burring portion of the punch and the insertion hole of the lower body is substantially 110% of the material thickness.

The method for manufacturing a heat exchanger cooling plate according to the present invention for achieving the above object, simultaneously forming and piercing the thin plate material to the lower body having a plurality of punch insertion holes are installed so that the die is liftable therein A molding preparation step and a piercing step of forming a plurality of holes in the thin plate material by lowering a plurality of two-stage punches having a piercing portion and a burring portion, and pressing the thin plate material against the die by the piercing portion of the two-stage punch. A lowering step of the two-stage punch further to form a bending step of bending the plurality of holes around the hole by pressing a burring portion of the second-stage punch around the hole of the material; Curing step of bending in a curved shape; characterized by having a.

And the step of curing, the step of setting the thin plate material on the die for currying so that the end of the bent portion of the thin plate material toward the punch, and a plurality of punching punches having a predetermined curved shape at the lower end of the thin plate material It is preferable to include the step of pressing towards.

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

Figure 3 illustrates an embodiment of a forming and piercing process co-molding mold according to the present invention.

As shown, the simultaneous molding mold of the present embodiment, the upper main body 10 is mounted to the upper and lower portions of the mold and equipped with a plurality of two-stage punch 30, and fixed to the lower portion of the mold material 300 It is provided with a lower body 20 for supporting.

Upper ends of the two-stage punches 30 are fixed to the upper body 10, and a step 35 is formed at a predetermined lower portion of each two-stage punch 30. A small diameter piercing portion 33 for the piercing process is formed below the step 35, and a large diameter burring portion 31 for the forming process is formed above the step 35. . The piercing portion 33 is to form a hole in the material by pressing the thin plate material 300, the burring portion 31 by pressing the periphery of the hole to bend downward, thereby forming a bur around the hole It is to.

Thus, the piercing portion 33 has a shape and size corresponding to the hole to be molded (101 in FIG. 1B). This piercing process is performed by the piercing portion 33 by pressing the thin plate material 300 against the die 40, the fillet portion (R2) of the piercing portion 33 should be formed very sharp. According to the experiment, it is preferable that the radius of curvature of the fillet portion R2 is 0.05 or less.

On the other hand, the burring portion 31 has a function of forming a burr (102 in Fig. 1b) around the hole by pressing bent around the hole of the raw material 300 with respect to the insertion hole of the lower body. Therefore, the radius of the burring portion 31 should be larger (Y) by the length of the burr to be molded than the radius of the piercing portion 33. Then, the radius of curvature of the fillet portion R1 of the piercing portion 33 is increased so that the material is bent without shearing when the piercing portion 33 presses the thin plate material 300. According to the experiment, the radius of curvature of the fillet portion R1 is preferably 1.00 or more.

Clearance, that is, the clearance X between the burring portion 31 of the two-stage punch 30 and the insertion hole 42 of the die 20 (to be described later) is 110% of the thickness of the material 300 ( The error range is preferably ± 3%). In the case of a general forming die, the clearance between the punch and the die becomes the material thickness, but in the forming and piercing co-molding die of the present invention, the above value should be obtained.

The circumferential surface of the piercing portion 33 and the circumferential surface of the burring portion 31 are preferably parallel to each other.

The lower body 20 is provided with a plurality of dies 40 corresponding to the two-stage punch 30, respectively. As shown, an insertion hole 22 into which the second stage punch 30 descending into the lower body 20 is inserted is formed, and the size of the insertion hole 22 is as described above. In addition, the die 40 is installed to be movable up and down inside the insertion hole 22, and an elastic means 42 (for example, a spring) is installed below the die 22, thereby raising the die 22. Elastic bias in the direction.

Hereinafter will be described the operation of the simultaneous molding mold of the present embodiment having the configuration as described above.

Fig. 4 shows a state of performing a piercing process on a thin material using the simultaneous molding mold of this embodiment, and Fig. 5 shows a state of performing a forming process on a pierced material.

When the simultaneous molding mold is operated from the state shown in FIG. 3 and the two-stage punch 30 descends downward by the action of the upper main body 10, first, as shown in FIG. The piercing part 33 compresses the raw material 300. As described above, since the fillet portion R2 of the piercing portion 33 is sharply formed, the fillet portion R2 presses the thin plate material 300 against the die 40, thereby enabling cutting of the material. do. As a result, a plurality of holes having the same size and shape as the piercing part 33 are formed in the material 300.

Then, when the two-stage punch 30 continuously descends and presses the die 40, the die 40 descends downward while winning the elastic force of the spring 42. As a result, the burring portion 31 of the two-stage punch 30 presses the periphery 302 of the material 300. As described above, since the fillet portion of the burring portion 31 is formed relatively blunt, the hole circumference 302 is not cut, and as shown in FIG. 5, the hole circumference 302 is inside the insertion hole 22. By bending along the circumferential surface, the burr 102 of the hole described in FIG. 1B is formed.

Then, when the upper body 10 and the two-stage punch 30 are raised to exit the insertion hole 22 of the lower body 20, the lower die 40 is raised by the action of the spring 42 By pushing out the processed material 300, both piercing and forming co-molding processes are completed.

By using such a simultaneous molding mold of this embodiment, the piercing and forming process can be performed simultaneously in one process in one single die without using a progressive die.

Hereinafter, a method of manufacturing a cooling plate for a heat exchanger using the co-molding die will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 3, the thin plate material 300 to be processed is set on the upper surface of the lower body 20 of the forming and piercing co-molding mold. A plurality of insertion holes 22 are formed in the lower body 20, and the insertion holes 22 are installed to allow the die 40 to be lifted and lowered, respectively. On the other hand, the die 40 is elastically biased upward by the spring 42, so that the upper surface of the die 40 is in contact with the lower surface of the thin plate material 300.

Then, as shown in Fig. 4, the plurality of two-stage punches 30 located at the top of the mold are lowered to perform a piercing process. In detail, as the two-stage punch 30 descends, the piercing part 33 formed below the two-stage punch 30 compresses the thin plate material 300 against the die 40. Since the fillet of the piercing portion 33 is sharply formed, a plurality of holes having the same size as the piercing portion 33 is formed in the thin plate material 300 by the pressing action.

When the two-stage punch 30 is further lowered, the burring portion 31 positioned above the piercing portion 33 presses the periphery 302 of the thin plate material 300. As a result, the hole circumference 300 is bent downward as shown in FIG. 5.

Then, when the two-stage punch 30 is raised, the die 40 is moved upward by the spring 420 to take out the processed thin plate material 300 from the lower body 20. As described above. This completes the forming and co-molding process.

Then, as shown in FIG. 6, a curing process is performed in which the bent portions around the plurality of holes formed in the raw material 300, that is, the burr 102, are processed into a predetermined shape. This curling step is for processing the end portion 102a of the burr 102 into a curved shape having a predetermined radius of curvature as described with reference to Fig. 1B.

To this end, first, the thin plate material 300 which has undergone the forming and piercing is installed in the die 62 for curling. In this case, the sheet material should be set so that the bent portion formed on the sheet material 300, that is, the end portion 102a of the burr 102, faces the curling punch 60.

The punch 60 is then urged toward the end 102a of the burr 102. The end of the curling punch 60 has a curved shape in which the corner portion 60a of the punch has a predetermined radius of curvature so as to have a shape corresponding to the end shape of the bur 102 to be molded.

When such a curing process is completed, the end portion 102a of the burr 102 of the thin plate material 300 has a bent outward shape, thereby providing a plurality of burring holes 101 having the shape shown in FIG. 1B. The cooling plate 100 is completed.

In order to manufacture the heat exchanger using this cooling plate 100, as shown in FIG. 2, several cooling is carried out so that the edge part 102a of the burr 102 of each said cooling plate 100 may contact the adjacent cooling plate. The plates are stacked, and a plurality of pipes 200 are inserted through the burring holes 101.

As described above, the forming and piercing process co-molding mold according to the present invention and a method for manufacturing a cooling plate for a heat exchanger using the same have the following advantages.

First, since the number of dies required for the process is reduced, the cost required for die production is reduced, and the cost of manufacturing parts is significantly reduced.

Second, it is possible to shorten the labor time and work time required for manufacturing parts, and it is easy to repair and replace the mold.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and may be modified in various forms by those skilled in the art within the technical scope of the present invention.

Figure 1a is a plan view of a cooling plate for a conventional heat exchanger,

1B is a cross-sectional view taken along the line A-A of FIG. 1A,

FIG. 2 is a schematic perspective view of a heat exchanger manufactured by using the cooling plate of FIG. 1A;

3 is a schematic cross-sectional view of an embodiment of a forming and piercing process co-molding mold according to the present invention;

4 is a sectional view showing the principal parts of a state in which a piercing process is performed in the simultaneous molding mold of FIG. 3;

FIG. 5 is a cross-sectional view illustrating main parts of a molding process of the simultaneous molding mold of FIG. 3. FIG.

6 is a cross-sectional view showing a state in which a curling process of the method of manufacturing a cooling plate for a heat exchanger according to the present invention is performed.

Explanation of symbols on the main parts of the drawing

10 ... upper body 20 ... lower body

22 ... insert hole 30 ... 2-stage punch

31 Burring section 33 Piercing section

35 ... step 40 ... die

42.Spring 100.Cooling plate

101 Burr Hole 102 Burr

200 ... pipe

Claims (4)

A two-stage punch having a piercing part installed to be elevated and lowered, and having a piercing part for crimping and punching a material and a burring part for pressing and bending around the hole of the material; A lower main body supporting the raw material and having a punch insertion hole into which the two-stage punch is inserted; A die provided to be lifted and lowered in the punch insertion hole, Forming and piercing co-molding die, characterized in that the elastic means for elastically biasing the die in the upward direction. The method of claim 1, A step is formed at a predetermined portion of the two-stage punch, The piercing part is formed on the top with respect to the step, the burring part is formed in the lower portion around the step, forming and piercing simultaneous molding die. The method of claim 2, And a radius of curvature of the fillet portion of the piercing portion is 0.05 or less, and a radius of curvature of the fillet portion of the piercing portion is 1.00 or more. The method of claim 2, And the clearance between the burring portion of the punch and the insertion hole of the lower body is substantially 110% of the thickness of the material.

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