TWI617374B - Long sleeve manufacturing method - Google Patents

Abstract

A method for manufacturing a long sleeve, the prepared columnar material is formed into a first groove extending from the first end toward the second end after forming a pit which is extruded or forged, and then in the column When the supporting force of the raw material is still sufficient, the head is forged first, and the second groove is formed on the opposite side of the first groove, and then the first groove is pressed to form a section. The first segment of the polygon and the second segment with a circular cross section. For the first groove forming the first segment and the second segment, the step of forging is performed before the extrusion, thereby effectively preventing the skew caused by insufficient support of the physical material after extrusion, so that The method of manufacturing the long sleeve of the present invention is more advantageous for producing a long sleeve having a large difference in the diameter between the head and the stem.

Description

Long sleeve manufacturing method

The present invention relates to a method of manufacture, and more particularly to a method of making a long sleeve.

Referring to Fig. 1, the invention patent of No. 105111964 "Forming Method for Long Sleeve" (which has been granted the invention patent No. I586454), which the invention has previously applied, includes the following steps: First, step 21 is prepared. A cylindrical material 3 of a predetermined size, the material 3 having an opposite first end 31 and a second end 32. Next, in step 22, a first chamfer 311 is formed at the first end 31 of the material 3. Next, in step 23, after the first end 31 and the second end 32 of the raw material 3 passing through the step 22 are inverted upside down, a first pit 312 is formed on the first end 31 of the raw material 3, and The second end 32 of the material 3 is formed with a second chamfer 321 . Step 24 is to form a second recess 322 at the second end 32 of the material 3, and press the first end 31 of the material 3 along the first recess 312 to form a first end 31. A first groove 313 extending in the direction of the second end 32. At this time, the first groove 313 has been processed to have a first segment 314 extending from the first end 31 toward the second end 32 and having a hexagonal cross section, and a first segment 314 is oriented The second end 32 extends in a second segment 315 having a circular cross section. Then, in step 25, the first end 31 and the second end 32 of the raw material 3 passing through the step 24 are inverted, and then the raw material 3 is forged, so that the raw material 3 has a second end 32 facing the first a head portion 33 extending in the direction of the end 31, a rod portion 34 extending from the first end 31 toward the head portion 33, and a constricted portion 35 integrally connected between the head portion 33 and the rod portion 34, The cross section of the constricted portion 35 is tapered by the head portion 33 toward the rod portion 34. Step 26 is to press the second end 32 of the material 3 along the second recess 322 to form a second groove 323 extending from the second end 32 toward the rod portion 34 and having a polygonal cross section. And a partition wall 36 between the second recess 323 and the first recess 313. Finally, step 27 is to break the partition wall 36 to connect the first groove 313 with the second groove 323, that is, to manufacture the long sleeve 4.

In this step 24, the first section 314 and the second section 315 of the first groove 313 are directly formed by extrusion. However, in the process of simultaneously stretching the material 3 by die pressing, in addition to the material to be formed in the step 25 to be formed in the step 25, the solid material surrounding the stem portion 34 of the first groove 313 In part, it is bound to be in a relatively thin state due to the external force of the first segment 314 and the second segment 315 being squeezed, resulting in a situation in which the supporting force is obviously insufficient. In the subsequent step 25, the raw material 3 is formed into a head 33 having a larger diameter than the original diameter in a forging manner. Therefore, if the supporting force of the rod portion 34 is relatively weak, To be forged with greater force, the head 33 is made larger than the original diameter of the material 3 (for example, the diameter of the head 33 is greater than 1.3 times the diameter of the rod 34). The stem portion 34 is easily skewed due to the inability to support the forging force. Therefore, the molding method of the long sleeve shown in FIG. 1 can only be applied to the case where the difference in the diameter difference between the head portion 33 and the rod portion 34 is small, and the difference in the width of the head portion 33 and the rod portion 34 is different. When it is larger, the rod portion 34 is liable to be skewed when the step 25 is performed, thus affecting the yield of the long sleeve 4.

Accordingly, it is an object of the present invention to provide a method for producing a long sleeve which can improve the manufacturing yield and has a good manufacturing quality.

Thus, the method of manufacturing the long sleeve of the present invention comprises the following steps in sequence.

A columnar material of a predetermined size is prepared, the columnar material having an opposite first end and a second end.

A first chamfer is formed at the first end of the columnar material.

A first recess is formed at the first end of the columnar material, and a second chamfer is formed at the second end of the columnar material.

Forming a second recess at the second end of the columnar material, and pressing the first end of the columnar material along the first pit to form a direction from the first end toward the second end The first groove extends.

Forging the columnar material such that the columnar material has a head extending from the second end toward the first end, a stem extending from the first end toward the head, and an integral connection In the constricted portion between the head and the rod portion, the cross section of the constricted portion is tapered by the head portion toward the rod portion.

Extruding a second end of the columnar material along the second recess to form a second groove extending from the second end toward the rod portion, and a second groove and the first groove a dividing wall between the grooves.

Squeezing the first groove such that the first groove forms a first segment extending from the first end toward the second end and having a polygonal cross section, and a first segment facing the second end The second section of the direction extending and having a circular cross section.

The partition wall is removed to connect the first recess and the second recess.

The effect of the invention is that before the pressing of the first groove, the step of forging is performed first when the supporting force of the solid material is still sufficient, so that the column material can withstand a strong forging force and form a diameter. The larger the head, and the absence of skew, in addition to avoiding skew and effectively improving the yield, but also because of the greater force that can be applied during forging, especially for the head and the rod The manufacturing requirements of the difference in the diameter of the ministry can increase the manufacturing yield and quality.

Referring to Figure 2, an embodiment of the method for manufacturing a long sleeve of the present invention comprises the following steps: First, step 51 is to prepare a columnar material 6 of a predetermined size, the column material 6 having an opposite first end. 61 and a second end 62. It should be noted that in the present embodiment, the columnar material 6 is cylindrical, and if it is necessary to manufacture a long sleeve having other shapes, other shapes can be selected according to requirements or mold conditions. The columnar material 6 is. In addition, the design of the mold is known to those skilled in the art, and those skilled in the art can naturally design corresponding molds according to the description of the embodiments of the present invention, so the description of the molds is not repeated here.

Next, in step 52, a first chamfer 611 is formed at the first end 61 of the columnar material 6; and in step 53, the first end 61 of the columnar material 6 and the second end 62 are inverted. The first end 61 of the columnar material 6 is formed with a first recess 612, and a second chamfer 621 is formed at the second end 62 of the columnar material 6. It should be particularly noted that the action of inverting the columnar material 6 in the present embodiment is performed in accordance with the design of the mold, and the inversion operation mentioned later in the present embodiment is also the same, and will not be further described.

Step 54 is to form a second dimple 622 at the second end 62 of the columnar material 6, and press the first end 61 of the columnar material 6 along the first dimple 612 to form a The first end 61 faces the first groove 613 extending in the direction of the second end 62. At this time, since the solid material surrounding the first groove 613 is only subjected to preliminary extrusion to form the first groove 613, and still retains a certain thickness, the columnar material 6 still has a considerable overall value. Supportiveness.

Step 55 is to invert the first end 61 of the columnar material 6 and the second end 62 and then forge the column material 6 so that the column material 6 has a second end 62 facing the first end. A head portion 63 extending in the direction of 61, a rod portion 64 extending from the first end portion 61 toward the head portion 63, and a constricted portion 65 integrally connected between the head portion 63 and the rod portion 64. Since the solid material portion of the rod portion 64 still maintains a certain thickness, the second end 62 of the columnar material 6 is forged by a strong force to form a width wider than the original diameter of the columnar material 6. At the time of the head 63, the stem portion 64 having a smaller diameter than the original gauge width is still sufficient to withstand the strong force described without skewing. Wherein, the cross section of the constricted portion 65 is tapered by the head portion 63 toward the rod portion 64, so that the head portion 63 can extend to the rod portion 64 via the constricted portion 65, thereby extending the curve. Optimize structural strength.

Referring to FIG. 2 and FIG. 3, step 56 is to press the second end 62 of the columnar material 6 along the second recess 622 (as shown in step 54 and step 55) to form a second end 62. A second groove 623 extending in a direction of the rod portion 64 and having a quadrangular cross section, and a partition wall 66 interposed between the second groove 623 and the first groove 613.

Referring to FIG. 2 to FIG. 5, step 57 is to press the first groove 613 to form a first segment 614 extending from the first end 61 toward the second end 62, and a second segment 615 extending from the first segment 614 toward the second end 62; and pressing the second recess 623 to form a circle extending a distance from the partition wall 66 toward the second end 62 Segment 624. Wherein, the first section 614 has a hexagonal cross section formed for the step 57, and the cross section of the second section 615 and the circular section 624 have a circular cross section. The first segment 614 is formed while maintaining the original cross-sectional shape of the first groove 613. Finally, step 58 is to remove the partition wall 66 to connect the first groove 613 and the second groove 623 to complete the fabrication of the long sleeve.

Among the specifications common in the related art of the long sleeve, the present embodiment is applied to the case where the ratio of the diameter of the head portion 63 to the rod portion 64 is 1.3 to 1.6:1. When it is required to make the diameter of the head 63 larger, then in step 55, a larger forging force is applied, in which the first segment 614 and the second segment 615 need to be formed. In the case of the present invention, the first groove 613 is pressed after forging to provide a better supporting force for the portion of the rod portion 64 when forging, thereby effectively avoiding insufficient support force of the rod portion 64. When the skew is caused, the manufacturing yield and quality can be effectively improved. In particular, the ratio of the diameter of the head portion 63 to the rod portion 64 is between 1.3 and 1.6, which is an effective improvement of the conventional technique. The yield problem.

In summary, the manufacturing method of the long sleeve of the present invention is to perform forging when the supporting force of the solid material is still sufficient, so that the column material 6 can withstand a strong forging force to form the head 63. In the case where the skew is not generated, in addition to being able to avoid the skew and effectively improving the yield, and also being able to apply a greater force when forging, it is particularly applicable to the diameter of the head 63 and the stem portion 64. The manufacturing requirements of the difference are large, and thus the manufacturing yield and quality can be improved, so that the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

51~58‧‧‧Steps
6‧‧‧ columnar raw materials
61‧‧‧ first end
611‧‧‧First chamfer
612‧‧‧ first pit
613‧‧‧First groove
614‧‧‧ first paragraph
615‧‧‧second paragraph
62‧‧‧ second end
621‧‧‧second chamfer
622‧‧‧second pit
623‧‧‧second groove
624‧‧‧Circular segment
63‧‧‧ head
64‧‧‧ pole
65‧‧‧ Contracted neck
66‧‧‧ partition wall

Other features and advantages of the present invention will be apparent from the embodiments of the drawings, wherein: Figure 1 is a flow chart illustrating a conventional method of forming a long sleeve; Figure 2 is a flow chart illustrating FIG. 3 is a cross-sectional view showing a cross-sectional view of a second groove of a columnar material in the embodiment; and FIG. 4 and FIG. , indicating the cross-sectional shape of the first groove of one of the column materials at different positions.

Claims (6)

A method for manufacturing a long sleeve, comprising the steps of: (A) preparing a columnar material of a predetermined size, the columnar material having an opposite first end and a second end; (B) in the columnar shape a first chamfer is formed at the first end of the raw material; (C) a first pit is formed at the first end of the columnar material, and a second chamfer is formed at the second end of the columnar material; (D) forming a second pit at the second end of the columnar material, and pressing the first end of the columnar material along the first pit to form a first end facing the first a first groove extending in a direction of the two ends; (E) forging the columnar material such that the columnar material has a head extending from the second end toward the first end, and a head end oriented from the first end a stem extending in the direction of the head, and a constricted portion integrally connected between the head and the stem, the cross section of the constricted portion being tapered from the head toward the stem portion, wherein The ratio of the diameter of the head to the stem is between 1.3 and 1.6; (F) pressing the second end of the cylindrical material along the second recess to form a second end toward the second end a second groove extending in a direction, and a partition wall between the second groove and the first groove; (G) pressing the first groove to form the first groove a first segment extending toward the second end direction and having a polygonal cross section, and a second segment extending from the first segment toward the second end and having a circular cross section; and (H) removing The partition wall communicates the first groove and the second groove. The method for manufacturing a long sleeve according to claim 1, wherein the step (C) is: after inverting the first end and the second end of the columnar raw material in the step (B), and then the columnar raw material The first end forms the first dimple while the second chamfer is formed at the second end of the columnar material. The method for manufacturing a long sleeve according to claim 1, wherein the step (E) is: inverting the first end and the second end of the columnar material passing through the step (D), and then forging the column. raw material. The manufacturing method of the long sleeve according to claim 1, wherein the first groove of the step (D) has a circular cross section. The manufacturing method of the long sleeve according to claim 1, wherein the second groove of the step (F) has a polygonal cross section. A method of manufacturing a long sleeve according to claim 5, wherein the step (G) further presses the second groove to form a circular segment extending a distance from the partition wall toward the second end.