KR960011669B1 - Method of forming articles and apparatus therefor - Google Patents

Abstract

a lower die(42) having a setting section(21) on the lower surface corresponding with the lower structure of the first product; a forming die(10) composed of a pair of right and left dies(12,14), and having a round protrusion section(15) to match to a parallel groove section(36) formed in its inside; and a moving punch(40) having a shape corresponding with the upper structure of the product(301).

Description

Method for forming article having symmetric recess in center and upper press forming device

1 is a perspective view of a forming die when the upper press-molding apparatus of the present invention is applied to spool manufacturing of a spinning rail for fishing.

2 is a cross-sectional view of the forming die shown in FIG.

FIG. 3 is a state diagram used to explain the manufacturing process of the spool using the forming die shown in FIG. 1, and a is a state diagram inserted into an insertion groove formed in the lower die by combining a workpiece formed primarily on the forming die, b is a state diagram in which an annular upper flange is formed on the upper part of the workpiece by the pressing force of the punch;

4 is a front view of the spool of the fishing spinning rail for fishing obtained by the manufacturing process of FIG.

5 is a process chart showing a conventional splicing method.

6 is a process diagram showing yet another conventional sputter molding method.

7 is a process chart showing the method of forming the spool according to the present invention, Figure 8 is a cross-sectional view of the whole showing a specific example of the upper pressure forming apparatus of the spool according to the present invention.

* Explanation of symbols for main parts of the drawings

10: forming die 12, 14: left and right die

15: annular projection 16: upsetting (upsetting)

18: hole 32: upper flange

20: lower flange setting part 38: lower flange

42: lower die 36: intermediate groove

301: spool 21: setting unit

40: Punch 81: Die Plate

83: die holder 85: lower plate

87: Knockout Tackle 89: Knockout Pin

45: punch holder

The present invention relates to a method for molding an article having a symmetric recess in the center and an upper press molding apparatus, and more particularly, to a molding method and an upper press molding apparatus that can flexibly cope with the production of a small quantity multi-product having a symmetric recess in the center. will be.

In general, a product such as the spool 301 having a symmetric groove in the center portion, for example, used for fishing spinning rails as shown in FIG. 4, is manufactured according to several methods as follows.

First, the method of cutting the bar-shaped raw material 50 as shown in FIG. 5 (a) in the up, down, left and right hatched portions HL1 and HL2 as shown in FIG. 5 (b) requires a high processing cost.

Therefore, a method of cutting the side portion HL1 as shown in FIG. 6 (c) by first forging the upper and lower parts as shown in FIG. Even in this case, the machining cost is relatively high because it includes a cutting process.

In another conventional method, a mold is formed on the lower die in the same shape as the upper and lower flange portions of the spool, and the upper and lower left and right sides are separated and combined to insert and press a cylindrical workpiece to form the mold. It is to take out the product, which has a problem that the defect rate is high due to the impossibility of precise molding according to the pressing force of the die and punch to be separated and the position of the workpiece, and moreover, to reduce such defect rate There is also a problem that must be performed.

In addition, in the case of the method of automatically driving the upper, lower, left and right molds, it is not easy to change the mold and the press driving device according to the change of the size of the spool, which is not suitable for the manufacture of the splines used for the small quantity of spinning rails. At the same time, there is a problem that the cost of the automatic press apparatus is expensive.

The present invention has been made in consideration of the above circumstances, and an object thereof is a molding method that can flexibly cope with the production of a small quantity product having a symmetric recessed structure at the center, and a non-skilled person can mold a product having an accurate shape and dimensions. And to provide an upper pressure forming apparatus.

The present invention, in the upper pressing molding apparatus of the article having a symmetric recess in the center in order to achieve the above object, the same structure as the lower structure of the article by the one-step molding corresponding to the substructure of the primary processed product One set portion includes a lower die protruding from the bottom of the circular groove, and a pair of symmetrical left and right dies corresponding to the inner diameter of the lower die, and the upper and lower portions of the upper and lower portions corresponding to the structure of the article at the upper and lower portions in the combined state. The upper / lower setting part corresponding to the structure is formed, and a forming die having an annular protrusion part corresponding to the symmetric recessed part in a central part thereof is formed, and a movable punch having a shape corresponding to the upper structure of the article. It is achieved by providing an upper press forming apparatus for an article having a symmetric recessed structure at the center.

In addition, according to the present invention, in the method of forming an article having a symmetric recess in the center, the raw material is vertically pressed so that one side end is the same as the shape of one side end of the article, and the center and the other end are the yaw of the center of the article. A first step of forming an intermediate workpiece having the same shape as the groove portion, and a pair of symmetrical left and right dies having an inner shape corresponding to the outer shape of the recess and one side and the other end of the article, and detachable A second step of attaching the forming die to the insertion groove of the lower die by engaging the outer end of the intermediate workpiece with a forming die with the other end facing upward; and forming an inner side of the other end of the article. And a third step of forming a structure of the other end by pressing a punch having an external shape corresponding to the shape. The molding method of an article having a symmetrical concave structure is provided.

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

In the present invention, the primary processing is performed by the relatively simple forging process of FIG. 7 (a) and (b) in consideration of the problem of cost increase due to the conventional cutting process and the inflexibility of the small quantity product of the automated press device. The finished workpiece 30 is manufactured.

The primary processed workpiece 30 has a shape in which processing on one side end and the central portion of the article to be processed, that is, the article 301 having a symmetric groove structure at the central portion is completed.

At this time, the shape of one end portion may have any other shape including the flange portion 38, such as the spool 301.

A forming die for obtaining a finished product having a groove structure in the center as shown in Fig. 7 (c) from the primary processed workpiece shown in Fig. 7 (b) is a perspective view in Fig. 1, Fig. 2 The combined cross-sectional view of these is shown.

As shown in Figs. 1 and 2, this forming die 10 is composed of a left die 12 and a right die 14 which are bisected into cylindrical shapes. When the left die 12 and the right die 14 are coupled to each other in a symmetrical shape, they form a round shape.

The left and right dies 12 and 14 are formed in semi-circular setting portions 161, 162, 201 and 202, respectively, in upper and lower portions, and correspond to the half grooves 36 of the spool 301. The annular protrusions 151 and 152 are formed inward, and half holes 181 and 182 are formed in the center thereof.

Corresponding to the spool 301 shown in FIGS. 4 and 3 (b), the upper setting parts 161 and 162 have a diameter smaller than that of the lower setting parts 201 and 202, When the left and right dies 12 and 14 are aligned with each other, a circular upsetting portion 16 is formed as shown in FIG. 2, and the lower flange setting portion 20 is formed by the lower setting portions 201 and 202. Is formed, the inner middle portion is formed with an annular projection 15 for receiving the middle groove portion 36 of the spool, one hole 18 is formed in the center of the annular projection (15).

The upper press forming apparatus of the present invention has a shape previously formed by the primary processing process as shown in FIGS. 3A and 3B, and in this embodiment, the lower portion of the spool 301 as shown in FIG. A lower die 42 having a setting portion 21 having an outer diameter corresponding to the flange 38 protruding from the bottom of the circular groove 44, and a pair of symmetrical left and right dies corresponding to the inner diameter of the lower die 42. (12, 14), the upper and lower flange setting portions (16, 20) corresponding to the outer diameter of the upper and lower flanges (32, 38) of the spool in the mutually coupled state are formed on the upper and lower sides, Punch 40 mounted to the ram with dimensions corresponding to the inner diameter of the forming die 10 and the inner flange of the upper flange 32 formed with an annular projection 15 corresponding to the intermediate groove 36 of the spool 301 It consists of.

The operation and effects of the present invention will now be described with reference to FIG.

First, as shown in (a) of FIG. 3, the lower flange 38 joins the left and right dies 12 and 14 to the outer surface of the workpiece 30 to be primarily processed, thereby forming an insertion groove formed in the lower die 42. Inserted in (44).

The diameter of the inlet of the insertion groove 44 is made larger by partially offsetting the diameter of the forming die 10 to which the left and right dies 12 and 14 are fitted and the diameter of the insertion groove 44 of the lower die 42. It is preferable to facilitate the insertion and withdrawal of the forming die 10 and to prevent the attachment of the upper die and the damage of the mold. In this case, the angle α formed between the inner circumferential surface of the insertion groove 44 and the outer circumferential surface of the forming die 10 is preferably in the range of 1 ° to 2 °.

The lower flange 38 is located in close or partial deviation with the setting part 20 of the forming die 10.

In the above state, the press is operated to lower the upper punch 40 to press the upper part of the workpiece 30 as shown in FIG. 3 (b). The upper part of the workpiece 30 is applied to the pressing force of the punch 40. As a result, the pressing force is released while being consistent with the upsetting portion 16 of the forming die 10.

Then, the punch 40 is raised to its original position, and the workpiece 30 pulls the bending forming die 10 by hand and places it on the work die. The left and right dies 12 and 14 are formed to be formed workpieces. The spool 301 is withdrawn.

FIG. 4 is a side view of the spool 301 formed according to the manufacturing process of FIGS. 3A and 3B. The annular portion 34 is formed in the upper flange 32. As shown in FIG. The annular portion 34 is formed to have a constant thickness and the inner surface diameter corresponds to the diameter of the punch 40.

8 shows an embodiment of the upper press forming apparatus of the spool according to the present invention.

In FIG. 8, reference numeral 12 is a left die, 14 is a right die, and forms a forming die 10, 21 is a die serving as a setting part for setting a primary processed workpiece, 40 is a punch, and 45 is a punch. Holder 81 for die plage, 83 for die holder, 85 for lower plate, 87 for knock-out plate, 89 for withdraw the finished spout out of die holder 83 Each knock-out pin is shown.

The upper press-molding apparatus shown in FIG. 8 shows the third-degree apparatus for performing the process of FIG. 7 (c) in more detail. The overall construction and operation principle thereof are substantially the same, and thus description thereof is omitted. do.

However, the specific apparatus of FIG. 8 includes a knock out plate 87 and a knock out pin 89 so as to more easily withdraw the processed spool from the lower die consisting of the die holder 83 and the die plate 81. Only the additional points are different.

With the knockout mechanism described above, when the machining by the punch 40 is completed, the knockout plate 87 is raised, and as a result, the knockout pin ejects the processed spool and forming die from the lower die to the upper portion more easily. There is an advantage to take out the finished spool.

As described above, according to the present invention, the first processed workpiece can be easily set and inserted into the lower die to perform the secondary processing, and the forming die can be used to form a product with a precise shape and dimension, and the degree of work is improved. It does not require a high level of skill, making it easy for unskilled workers.

In addition, the present invention has the advantage that it is possible to flexibly form a spool product according to a new model by simply modifying the forming die in response to the spool change of dimensions.

The present invention is not limited to the above embodiments and many variations and modifications can be made by those skilled in the art without departing from the spirit of the present invention.

For example, it is also possible for one side of the primary processed workpiece to have a structure of any shape other than the flange portion. That is, a feature of the present invention is the molding of a product having a recessed structure at the center.

Claims (6)

In the upper press-molding apparatus of the article 301 having the symmetric recessed portion 36 in the center, the setting portion 21 corresponding to the substructure of the primary processed article in which the same structure as the substructure of the article is preformed by one-step molding. ) Is composed of a lower die 42 protruding from the bottom of the circular groove, and a pair of symmetrical left and right dies 12 and 14 corresponding to the inner diameter of the lower die 42, and the upper and lower portions in the combined state. A forming die 10 having upper and lower setting portions 16 and 20 corresponding to the structure of the article, and having an annular protrusion 15 corresponding to the symmetric recessed portion 36 at the center portion thereof; An upper press forming apparatus for an article having a symmetric recessed groove structure in a central portion, characterized by comprising a movable punch 40 having a shape corresponding to the upper structure of 301. The apparatus as claimed in claim 1, wherein the article (301) has a flange at the top and the bottom of the article (301). 3. The apparatus as claimed in claim 2, wherein the article (301) is a spool of a spinning rail for fishing. The article having a symmetrical recessed structure in a central portion of claim 1, wherein an interval between the inner circumferential surface of the lower die 42 and the outer circumferential surface of the forming die 10 is in a range of 1 to 2 degrees in an upward direction. Upper press forming apparatus. The knock-out mechanism of claim 1, wherein the knock-out mechanism for ejecting the finished product 301 to the outside together with the forming die 10 is mounted to be movable upward and downward through the setting part 21 and the lower die 42. The upper pressing molding apparatus of the article having a symmetric groove structure in the central portion characterized in that it further comprises. In the method of forming an article having a symmetric recess in the center, the raw material is vertically pressurized so that one side end is the same as the shape of one end of the article, and the center and the other end have the same shape as the recess of the center of the article. The first step of forming the intermediate workpiece, and using a forming die consisting of a pair of symmetrical left and right dies having an inner shape corresponding to the outer shape of the recess and one side and the other end of the article and detachable A second step of attaching the forming die to the insertion groove of the lower die by coupling the outer end of the intermediate work to the other end of the intermediate work upward and an outer shape corresponding to the inner shape of the other end of the article; It has a symmetric groove structure in the center portion, characterized in that the third step of forming a structure of the other end by pressing a punch having a Forming method of the article.