TWI725885B - Manufacturing method of sleeve - Google Patents

Abstract

A method for manufacturing a sleeve includes an initial forging step, a continuous forging step, a first feature forming step, a stretching step, a second feature forming step, and a shaping step. In the preliminary forging step, the two ends of a blank are processed into a first end forming a first groove and a second end forming a second groove. In this continuous forging step, the blank is extruded and stretched. In the first characteristic forming step, the part of the blank connecting the first end and the second end is formed into a cone-shaped receiving part, and the first groove is formed into an inner square hole with four corners. In this stretching step, the blank is extruded and stretched. In the second characteristic forming step, the second groove is trimmed into an inner hexagonal hole in an extrusion manner. In the shaping step, the first end is extruded and stretched to produce a sleeve.

Description

Manufacturing method of sleeve

The present invention relates to a method for manufacturing a workpiece, in particular to a method for manufacturing a sleeve.

A general sleeve is generally cylindrical, and a polygonal deep hole recessed inward is formed on one or both ends of the sleeve, such as an inner square hole, an inner hexagon hole, or an inner twelve-corner hole. These deep holes can correspond to four-corner, hexagonal, or twelve-point bolts (or nuts), and form required shape features on the outer surface. Therefore, the sleeve is often fitted with a wrench to quickly disassemble or lock the aforementioned mechanical components. The current method of manufacturing the sleeve is to shape the blank into a cylindrical shape, and process the aforementioned inner hole and outer surface characteristics by cutting and boring removal methods. This removal processing method requires multiple reciprocating passes. It can be completed, time-consuming and labor-intensive, and a large amount of waste will be generated, resulting in low material utilization, rising costs, and waste of resources. In the process of cutting or boring the sleeve, the strength of the finished product will be reduced due to the destruction of the continuity of the material itself, so there is still room for improvement.

Therefore, the purpose of the present invention is to provide a The manufacturing method of the sleeve that has the strength of the finished product and reduces the processing time and the number of passes.

Therefore, the manufacturing method of the sleeve of the present invention includes a preliminary forging step, a continuous forging step, a first characteristic forming step, a stretching step, a second characteristic forming step, and a shaping step. In the preliminary forging step, a first end portion and a second end portion opposite to the first end portion are processed from both ends of a cylindrical metal blank, the first end portion being recessed inwardly A first groove, and the second end portion is recessed inward to form a second groove with a maximum diameter and an angle smaller than the first groove. In the continuous forging step, the blank is squeezed and stretched, and the first groove and the second groove are squeezed to increase the depth of the first groove and the second groove. In the first characteristic forming step, the part connecting the first end and the second end of the blank is formed into a cone-shaped receiving part, and the depth of the first groove is further deepened, and the The first end is shaped into a square tube shape, and the first groove is shaped into an inner square hole with four corners. In the stretching step, the blank is squeezed and stretched, so that the second end and the receiving portion are elongated, and the slope of the receiving portion is reduced, and the receiving portion is formed with a second groove connected to the second groove的孔槽。 The hole slot. In the second characteristic forming step, the second groove is trimmed into an inner hexagonal hole in an extrusion manner. In the shaping step, the first end portion is squeezed and stretched, and the hole groove is connected to the first groove, thereby manufacturing a sleeve.

The effect of the present invention is that through the above process, a sleeve with the characteristics of an inner square hole and an inner hexagonal hole can be produced without cutting or boring and other material removal methods. The manufacturing method can avoid waste It can increase the utilization rate of materials, reduce the cost and waste of resources, and can also prevent the continuity of the sleeve material from being damaged and improve high strength.

11: Initial forging steps

12: Continued forging steps

13: The first feature forming step

14: Stretching steps

15: The second feature forming step

16: integer steps

2: Blank material

21: The first end

211: The first groove

22: second end

221: second groove

23: Acceptance Department

231: Hole

3: sleeve

A: Angle

B: Angle

C: round corner

D: Lead fillet

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a flowchart illustrating an embodiment of the method of manufacturing the sleeve of the present invention; FIG. 2 is a partial cross-sectional view, Illustrate one of the initial forging steps in this embodiment; Figure 3 is a partial cross-sectional view to illustrate a continuous forging step in this embodiment; Figure 4 is a partial cross-sectional view to illustrate one of the first characteristic forming steps in this embodiment; Figure 5 is A bottom view illustrating the bottom view of FIG. 4; FIG. 6 is a partial cross-sectional view illustrating one of the stretching steps in this embodiment; FIG. 7 is a top view illustrating the top view of FIG. 6; FIG. 8 is a bottom view, Figure 6 is a bottom view; Figure 9 is a partial cross-sectional view to illustrate one of the second characteristic forming steps in this embodiment; Figure 10 is a top view to illustrate the top view of Figure 9; and Figure 11 is a partial cross-sectional view to illustrate the present An integral step in the embodiment.

1, an embodiment of the method for manufacturing a sleeve of the present invention includes a preliminary forging step 11, a continuous forging step 12, a first feature forming step 13, a stretching step 14, and a second feature forming step 15. , And an integer step 16. The present invention is based on a metal The prepared cylindrical blank is the raw material, and the corresponding characteristics defined by each step are formed by forging through a plurality of different dies.

1 and 2, in the preliminary forging step 11, a first end 21 is processed from both ends of a cylindrical metal blank 2 and a second end opposite to the first end 21部22. The first end 21 is recessed inward to form a first groove 211 at an angle A, and the second end 22 is recessed inward to form a second recess 221 at an angle B. Here, the angle A and the angle B respectively refer to The inclination angles of the sidewall surfaces of the first groove 211 and the second groove 221, the angle B is smaller than the angle A, and the maximum diameter of the second groove 221 is smaller than the maximum diameter of the first groove 211, the first groove 211 A groove 211 and the second groove 221 are conical holes with a narrow inside and a wide outside and inclined sidewalls. In this embodiment, the first end 21 faces upwards and the second end 22 faces downwards to be placed in the mold, but it is not limited to this.

1 and 3, in the continuous forging step 12, the blank 2 is squeezed and stretched to increase the overall length, and the first groove 211 and the second groove 221 are squeezed to make the first groove 211 and the second groove 221 The depths of a groove 211 and the second groove 221 are increased.

Referring to Figure 1, Figure 4, and Figure 5, in the first feature forming step 13, the blank 2 is sent upside down into the mold for extrusion molding (the first end 21 faces downward and the second The end 22 faces upwards), so that the part of the blank 2 that connects the first end 21 and the second end 22 to form a cone-shaped receiving portion 23, and the receiving portion 23 and the first end The junction of the portion 21 forms a round corner C. And further increase the length of the first end 21 and shape it into a square tube as shown in FIG. 5, and the first groove 211 is also aligned as shown in FIG. It should be formed into a deep inner square hole with four corners. At this time, the second end 22 is still in a circular tube shape.

Referring to Figure 1 and in conjunction with Figures 6 to 8, in the stretching step 14, the blank 2 is squeezed and stretched, so that the second end 22 and the receiving portion 23 are elongated, and the receiving portion 23 is The slope is reduced, so that the receiving portion 23 and the second end 22 are closer in appearance, and the receiving portion 23 forms a slot 231 connected to the second groove 221 (but not yet connected to the first groove 211 through). Finally, the four right angles inside the first end 21 are trimmed into round corners D in an extrusion manner.

Referring to Figures 1, 9, and 10, in the second feature forming step 15, the second groove 221 is shaped into a hexagonal socket as shown in Figure 10 in an extrusion manner, and the second end The outer surface of 22 is still a circumferential surface. 1 and 11, in the shaping step 16, the first end 21 is squeezed and stretched, and the hole and groove 231 are connected to the first groove 211, so as to obtain a shape as shown in FIG. 11 Sleeve 3. The sleeve 3 also has the feature that one end is an inner hexagonal hole and the other end is an inner square hole.

In this embodiment, instead of cutting or boring and other subtractive material removal methods, the processing is performed by forging methods, which can avoid the problems of complicated processing passes and the waste caused by the generation of more waste materials, and increase the utilization rate of materials and reduce costs. In addition, since this embodiment is not processed by cutting and boring damage methods, the continuity of the material of the sleeve 3 itself can be prevented from being damaged, and the strength of the sleeve 3 can be improved.

In summary, the present invention can produce both ends through a non-cutting manufacturing method The sleeves 3 with the characteristics of the hexagonal inner hole and the inner square hole can improve the material utilization and strength, and reduce the required waste and cost, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to This invention patent covers the scope.

11: Initial forging steps

12: Continued forging steps

13: The first feature forming step

14: Stretching steps

15: The second feature forming step

16: integer steps

Claims (3)

A method for manufacturing a sleeve includes: a preliminary forging step, processing both ends of a cylindrical metal blank to form a first end, and a second end opposite to the first end, the first One end portion is recessed inward to form a first groove, and the second end portion is recessed inward to form a second groove with a maximum diameter and a side wall surface that is smaller than the inclination angle of the first groove; The blank is squeezed and stretched, and the first groove and the second groove are squeezed to increase the depth of the first groove and the second groove; a first characteristic forming step, the blank The part connecting the first end and the second end forms an oblique tubular receiving part, and further deepens the depth of the first groove, and the first end is shaped into a square tube, the first concave The groove is formed into an inner square hole with four corners; in a stretching step, the blank is squeezed and stretched, so that the second end and the receiving portion are elongated, and the slope of the receiving portion is reduced, and the receiving portion forms a continuous The second feature forming step is to trim the second recess into an inner hexagonal hole in an extrusion manner; and the shaping step is to squeeze and stretch the first end, and make the The hole groove communicates with the first groove, thereby making a sleeve. The method for manufacturing a sleeve according to claim 1, wherein in the stretching step, the four right angles inside the first end portion are trimmed into round corners in an extrusion manner. The method of manufacturing a sleeve according to claim 1, wherein the first feature is In the molding step, round corners are formed at the connection between the receiving portion and the first end portion in an extrusion manner.

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