TWI757596B - Method of forming a work piece having a long slot and the mold thereof - Google Patents

Abstract

A method of forming a work piece having a long slot and the mold thereof includes a preparation step and a long slot forming step. The long slot forming step is to prepare a mold, and a forming punch for punching the mold. The mold has a body, a receiving groove formed on the body, and a long groove communicating with the receiving groove and having a diameter smaller than a diameter of the receiving groove. The smaller diameter of the long groove allows a blank to be pressed by compact force caused when the blank extends toward the long groove, thereby compacting a shank, increasing the strength of the formed shank and long slot, avoiding cracks formed inside the long slot, forming a work piece having the long slot with high precision, increasing production efficiency and recusing costs.

Description

Forming method of workpiece with long slot hole and mold thereof

The present invention relates to the manufacture of a workpiece with a long slot hole design, in particular to a method for forming a workpiece with a long slot hole and a molding die thereof.

The known workpiece with slotted holes is mainly manufactured by a multi-stroke cold-section forming machine. Generally, after cutting the metal wire into blanks of a predetermined length, the blanks are sequentially passed through different degrees. Stamping deformation to produce workpieces (eg sleeves, rivets) with hollow-shaped slots.

Referring to FIG. 1 , a conventional sleeve manufacturing method 1 includes a blank cutting step 11 , a preliminary segment pressing step 12 , a deep drawing extrusion step 13 , and a penetration step 14 ; wherein, the blank cutting step 11 is a The wire is cut into a blank 2 of a predetermined length; in addition, the preliminary section pressing step 12 is to press the two ends of the blank 2 into rounded corners; After the two ends are formed with a deep groove 21 and a shallow groove 22 opposite to each other, and a partition wall 23 between the deep groove 21 and the shallow groove 22, the passing through step 14 and then the partition wall After 23 is punched, the deep groove 21 and the shallow groove 22 are penetrated to form a workpiece with perforations for subsequent processing.

Although the deep groove 21 can be extruded by the conventional method, it is found after the actual use that because the blank 2 is in the deep drawing and extrusion step 13, referring to FIG. 2, a punch 3 is used to The die 4 is formed with the cooperation of the die 4, a bump 31 is formed on the punch 3, and a thimble 41 is provided on the die 4, so that when the blank 2 is placed on the die 4, the punch 3 punches the blank 2 one end, the end of the blank 2 punched by the punch 3 forms the shallow groove 22 due to the bump 31, and the other end of the blank 2 is extruded by the ejector pin 41 to form the deep groove 21 However, after the actual use, it was found that in the stamping process of the blank 2, the blank 2 was under the same outer diameter, and was squeezed out of the deep groove 21 by the ejector pin 41, and there was no tightening effect during the molding process, resulting in After forming, the strength of the tissue around the deep groove 21 is weak, and it is easy to produce cracks or cracks on the wall surface of the deep groove 21, and the cracks will affect the overall strength. Removing the cracked wall surface by car repair will not only make the processing procedure more complicated and reduce the production efficiency, but also the waste generated by the car repair will also cause considerable waste of materials, and the extrusion or car repair process is also likely to cause the blank 2 The deep groove 21 is skewed and skewed, resulting in poor precision, which needs to be improved.

Therefore, the purpose of the present invention is to provide a method for forming a workpiece with long slot holes and a mold thereof, which can quickly and accurately shape a workpiece with long slot holes, thereby effectively improving production efficiency and reducing production costs.

Therefore, the method for forming a workpiece with long slot holes and a mold thereof of the present invention include a preparation step and a long slot hole forming step; wherein, the preparation step is to prepare a columnar blank, and the blank has opposite the first and second ends; in addition, the long slot hole forming step is equipped with a mold and a forming punch for punching the mold, wherein the mold includes a body and a placement groove formed on the body , an elongated slot which communicates with the placing slot and whose diameter is smaller than the diameter of the placement slot, and a top post arranged in the elongated slot, so that the blank is placed in the mold, so that the first end After being held and positioned by the top column, the second end is punched by the punch, so that the blank on the placing groove forms a head, and part of the blank on the placing groove is squeezed to the long strip. The slot extends to form a shaft, and the blank forms a long slotted hole relative to the top column position, thereby forming a workpiece; therefore, the diameter of the elongated slot is smaller than the diameter of the placement slot. When the blank is extended and squeezed into the long slot by the punching tool, the blank will generate a tightening force in addition to the extension, which increases the strength of the shaft and the long slot, and at the same time Due to the tightening effect, it is not easy for cracks to occur inside the long slotted hole, so as to improve the precision effect of the whole workpiece after forming, and improve the production efficiency and reduce the production cost.

The foregoing and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of the preferred embodiments with reference to the drawings.

Referring to FIG. 3 and FIG. 4 , a preferred embodiment of the present invention, the method 5 for forming a workpiece with long slotted holes of the present invention includes a preparation step 51 and a long slotted hole forming step 53; wherein, the preparation step 51 is provided with a columnar The blank 6 has opposite first and second ends 61, 62, and the blank 6 can be cut from a metal wire to a predetermined length; in addition, in this embodiment, the long groove Before the hole forming step 53, there is another preliminary forming step 52, which forms a first arc surface 611 at the periphery of the first end 61 of the blank 6, and at the same time forms a groove 612 at the center of the first end 61, and at the same time In order to make the extrusion and extension process smoother, in the preliminary forming step 52, an extension portion 613 connecting with the first arc surface 611 can be extended outward from the first end 61; The two ends 62 form a second arc surface 612 , and in the following embodiments, the structure provided with the first arc surface 611 , the second arc surface 612 , the groove 612 , and the extending portion 613 is described as an example.

Furthermore, referring to FIG. 5 , the slotted hole forming step 53 is equipped with a mold 7 and a punch 8 for stamping and forming the mold 7 , wherein the mold 7 includes a body 71 , and a mold 7 is formed on the body. The placement groove 72 on the 71, an elongated slot 73 communicated with the placement slot 72 and having a diameter 73d smaller than the diameter 72d of the placement slot 72, and a top post 74 set in the elongated slot 73, In this embodiment, the elongated groove 73 can be designed according to the shape of the shaft 92 of the workpiece 9 after forming.

Continuing the above, when punching is to be performed in this embodiment, the blank 6 is first placed into the mold 7, so that the first end 61 is supported by the top post 74, and the design of the groove 612, the The groove 612 can be in contact with the top post 74 , so that the blank 6 can be positioned more accurately. At the same time, the design of the extension portion 613 can provide that when the blank 6 is placed in the mold 7 , the extension portion 613 can partially extend When placed in the elongated groove 73, a better positioning effect can also be achieved, so that the subsequent molding is smoother and more accurate.

Continuing the above, after the blank 6 is placed, the punch 8 punches the second end 62 so that after the center of the first end 61 is supported by the top post 74, the blank 6 will be partially squeezed into the long In the slot 73, because the diameter 72d of the placement slot 72 is larger than the design of the diameter 73d of the slot 73, the blank 6 is squeezed into the slot 73 In the process, a compressive force will be generated, so that the shaft 92 after forming is densely increased, so that the strength of the shaft 92 and the long slot 93 after forming is increased, so it can be avoided as in the conventional case due to insufficient strength. The effect of generating cracks on the inner side of the long slot hole 93; furthermore, the design of the extension part 613 makes the blank 6 squeeze into the long slot 73, it has the function of guiding and extending, and the pressed blank The material 6 can be extended into the elongated slot 73 from the position of the extension 613, so that the shaft 92 and the formed elongated slot 93 can improve the accuracy, avoid the occurrence of skew, and reduce the shaft with better accuracy. 92 or the long slot hole 93 is skewed during the molding process, so that when a long slot hole 93 with a longer length needs to be formed, the skew of the shaft 92 and the long slot hole 93 can be effectively avoided. , effectively increasing the production quality of the workpiece 9 .

Finally, after the long slot hole 93 is formed, the workpiece 9 with the long slot hole 93 can be completed, and when the workpiece 9 is used later, the head 91 and the end of the shaft 92 can be formed according to the desired pattern , The function is processed again to make the workpiece 9 with the long slot hole 93, such as a workpiece such as a rivet, a sleeve, etc.; therefore, the design of the forming method of the workpiece 9, which passes through the long strip The diameter 73d of the slot 73 is smaller than the diameter 72d of the placement slot 72, so that when the blank 6 is pressed into the elongated slot 73 from the placement slot 72 by the punch 8, the blank 6 will not move toward the elongated slot 73. During the extending process of the slot 73, a tightening force will be generated at the same time, so that the shaft 92 is more compact, so that the strength of the shaft 92 and the long slot 93 after forming is increased, so it is not easy to produce cracks on the inside of the long slot 93. In addition, the workpiece 9 with the long slot 93 is accurately formed, which can effectively improve the production efficiency and production cost; moreover, in the preliminary forming step 52, the extension is formed on the blank 6 before stamping. When the part 613 is formed, the deflection effect of the shaft 92 and the long slot hole 93 during the forming process can be prevented, so that the overall precision after forming is better.

Summarizing the foregoing, the present invention has a method for forming a workpiece with a slotted hole and a mold thereof. In the design of the mold, the placement groove of the mold is relatively smaller than the elongated groove design of the mold, so when the blank is placed in the placement groove, the blank is pressed during the stamping process. During the process of extruding from the placing slot into the long slot, a compressive force will be generated at the same time, so that the formed shaft will be more compact, and effectively avoid the phenomenon of cracks on the inner wall of the long slot during the forming process. Therefore, it is possible to avoid the situation of car repair and repair as in the prior art, so as to effectively improve the production efficiency and reduce the production cost; in addition, in the workpiece forming method, the preliminary forming step can be added in time to pass the design of the extension part. , so that the blank can be more accurate in the process of forming the shaft and the long slot, and the skew of the shaft or the long slot during the forming process can be reduced, so that the precision of the workpiece after forming is more accurate.

However, the above descriptions are only intended to illustrate the preferred embodiments of the present invention, and should not limit the scope of the embodiments of the present invention, and any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention. , shall still fall within the scope covered by the patent of the present invention.

[acquaintance]

1: Manufacturing method of sleeve

11: Blank cutting steps

12: Preliminary segment pressure step

13: Deep drawing extrusion step

14: Through the steps

2: Blank

21: Deep grooves

22: Shallow grooves

23: Dividing Wall

3: Punch

31: bump

4: Mold

41: Thimble

[this invention]

5: Forming method

51: Preparation steps

52: Preliminary forming steps

53: Long slot forming step

6: Blank

61: First End

62: Second End

611: The first arc surface

612: Groove

613: Extensions

621: The second arc surface

7: Mold

71: Ontology

72: Placement slot

73: Long slot

74: Top post

72d: Diameter of placing slot

73d: Diameter of long slot

8: Punch

9: Workpiece

91: head

92: Shaft

93: Long slotted hole

FIG. 1 is a schematic diagram of a conventional molding process. FIG. 2 is a schematic cross-sectional view of a conventional deep-drawing extrusion step. FIG. 3 is a flow block diagram of a preferred embodiment of the present invention. FIG. 4 is a schematic diagram of a molding process according to a preferred embodiment of the present invention. FIG. 5 is a schematic diagram of a mold forming process according to a preferred embodiment of the present invention.

5: Forming method of workpiece with long slotted hole

51: Preparation steps

52: Preliminary molding steps

53: Long slot forming step

Claims (3)

A method for forming a workpiece with long slotted holes, comprising: a preparation step, which prepares a columnar blank with opposite first and second ends; a preliminary forming step, which prepares the first and second ends A first arc surface is formed on the peripheral edge of the end, and a groove is formed at the center of the first end. In addition, a second arc surface is formed at the second end for punching by the punch. There is an extension portion which is connected to the first arc surface extending outward from the first end; and a long slot hole forming step, which is equipped with a mold and a forming punch for punching the mold, wherein the The mold includes a body, a placement groove formed on the body, an elongated slot communicated with the placement slot and having a diameter smaller than the diameter of the placement slot, and a top post disposed in the elongated slot, Put the blank into the mold, so that the groove at the first end can be used for positioning the ejector. After the ejector is positioned against the ejector, the second end is punched with the punch to make the placement groove. The upper blank is formed with a head, and part of the blank on the placing slot is extruded to extend toward the elongated slot to form a shaft, and the blank forms a long slot relative to the position of the top column, Then a workpiece is formed. According to the method for forming a workpiece with long slotted holes as described in claim 1, the head can be further processed to form a desired shape. According to the method for forming a workpiece with long slotted holes as described in claim 1, the end of the shaft can be further processed to form a desired shape.

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