CN109226616B

CN109226616B - Method for manufacturing long sleeve

Info

Publication number: CN109226616B
Application number: CN201710561415.XA
Authority: CN
Inventors: 赖传荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-07-11
Filing date: 2017-07-11
Publication date: 2020-06-02
Anticipated expiration: 2037-07-11
Also published as: CN109226616A

Abstract

A method for manufacturing long sleeve includes such steps as preparing a cylindrical raw material, forming the concave pits by extruding or forging, forming the first recess extending from the first end to the second end, forging to form the head while the supporting force of said raw material is still sufficient, forming the second recess opposite to the first recess, extruding the first recess to form the first segment with polygonal cross-section and the second segment with circular cross-section. Aiming at the requirement of forming the first section and the second section by the first groove, the forging step is carried out before extrusion, so that the deflection condition which is easily generated due to insufficient support property of solid materials after extrusion is effectively prevented, and the manufacturing method of the long sleeve is more beneficial to manufacturing the long sleeve with larger diameter difference between the head part and the rod part.

Description

Method for manufacturing long sleeve

Technical Field

The invention relates to a manufacturing method, in particular to a manufacturing method of a long sleeve.

Background

Referring to fig. 1, the invention patent of taiwan No. 105111964, "long sleeve forming method" (which has been granted the patent right of invention I586454) applied by the inventor of the present invention includes the following steps: first, step 21 is to prepare a cylindrical raw material 3 with a predetermined size, wherein the raw material 3 has a first end 31 and a second end 32 opposite to each other. Next, in step 22, a first chamfer 311 is formed on the first end 31 of the material 3. Next, in step 23, the first end 31 and the second end 32 of the raw material 3 after the step 22 are inverted up and down, a first concave recess 312 is formed at the first end 31 of the raw material 3, and a second concave recess 321 is formed at the second end 32 of the raw material 3. Step 24 is to form a second concave recess 322 at the second end 32 of the raw material 3, and press the first end 31 of the raw material 3 along the first concave recess 312 to form a first groove 313 extending from the first end 31 toward the second end 32. The first recess 313 has been machined to have a first section 314 with a hexagonal cross-section extending from the first end 31 toward the second end 32, and a second section 315 with a circular cross-section extending from the first section 314 toward the second end 32. Then, in step 25, the first end 31 and the second end 32 of the raw material 3 after the step 24 are inverted, and then the raw material 3 is forged, so that the raw material 3 has a head portion 33 extending from the second end 32 toward the first end 31, a rod portion 34 extending from the first end 31 toward the head portion 33, and a neck portion 35 integrally connected between the head portion 33 and the rod portion 34, and the cross section of the neck portion 35 is tapered from the head portion 33 toward the rod portion 34. In step 26, the second end 32 of the raw material 3 is pressed along the second recess 322 to form a second groove 323 extending from the second end 32 toward the rod 34 and having a polygonal cross section, and a partition wall 36 between the second groove 323 and the first groove 313. Finally, step 27 is to punch the partition wall 36 to connect the first groove 313 and the second groove 323, so as to manufacture the long sleeve 4.

In 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 extruding through the die and simultaneously stretching the raw material 3, except for the material that is reserved for forming the head 33 in the step 25, the solid material portion of the rod 34 surrounding the first groove 313 tends to be relatively thin due to the external force extruding out of the first section 314 and the second section 315, which results in a significantly insufficient supporting force. Since the head 33 with a larger diameter than the original diameter is formed on the raw material 3 by forging in the step 25, if the supporting force of the shaft 34 is relatively weak, the shaft 34 is prone to be distorted due to the force that cannot support the forging when the head 33 with a larger diameter than the original diameter of the raw material 3 is formed by forging with a larger force (for example, the diameter of the head 33 is 1.3 times larger than that of the shaft 34). Therefore, the method for molding the long sleeve shown in fig. 1 can be applied only when the difference between the diameters of the head portion 33 and the stem portion 34 is small, and when the difference between the diameters of the head portion 33 and the stem portion 34 is larger, the stem portion 34 is likely to be skewed during the step 25, which affects the yield of manufacturing the long sleeve 4.

Disclosure of Invention

The invention aims to provide a method for manufacturing a long sleeve, which can improve the manufacturing yield and has good manufacturing quality. The method for manufacturing the long sleeve of the invention comprises the following steps in sequence.

A column-shaped raw material with a preset size is prepared, and the column-shaped raw material is provided with a first end and a second end which are opposite.

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

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

Forming a second pit at the second end of the columnar raw material, and extruding the first end of the columnar raw material along the first pit to form a first groove extending from the first end to the second end.

Forging the columnar raw material to enable the columnar raw material to be provided with a head part extending from the second end to the first end, a rod part extending from the first end to the head part, and a necking part integrally connected between the head part and the rod part, wherein the section of the necking part is gradually reduced from the head part to the rod part.

The second end of the columnar raw material is extruded along the second pit to form a second groove extending from the second end towards the rod part, and a partition wall is arranged between the second groove and the first groove.

The first groove is extruded to form a first section which extends from the first end to the second end and has a polygonal cross section, and a second section which extends from the first section to the second end and has a circular cross section.

The partition wall is removed to communicate the first groove and the second groove.

The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.

Preferably, in the step (C), after the first end and the second end of the columnar material are inverted in the step (B), the first concave recess is formed at the first end of the columnar material, and the second chamfer is formed at the second end of the columnar material.

Preferably, in the method for manufacturing the long sleeve, the step (E) is to upset the first end and the second end of the cylindrical raw material after the step (D) and then forge the cylindrical raw material.

Preferably, in the method for manufacturing the long sleeve, a ratio of the diameter width of the head portion to the diameter width of the shaft portion is between 1.3 and 1.6.

Preferably, in the method for manufacturing the long sleeve, the cross section of the first groove in the step (D) is circular.

Preferably, in the method for manufacturing the long sleeve, the cross section of the second groove in the step (F) is polygonal.

Preferably, in the method for manufacturing the long sleeve, the step (G) further presses the second groove to form a circular section extending from the partition wall toward the second end for a distance.

The invention has the beneficial effects that: before the first groove is extruded, when the supporting force of the solid material is still enough, the forging step is carried out, so that the columnar raw material can bear strong forging force to form the head with a larger diameter width, and the deflection is not generated, thereby not only effectively improving the yield rate by avoiding the deflection, but also being particularly suitable for the manufacturing requirement of the head with a larger diameter width difference with the rod because a larger force is applied during the forging, and further improving the manufacturing yield rate and quality.

Drawings

FIG. 1 is a flow chart illustrating a conventional method of forming an elongated sleeve;

FIG. 2 is a flow chart illustrating one embodiment of a method of manufacturing the elongated sleeve of the present invention;

FIG. 3 is a cross-sectional view illustrating a cross-sectional configuration of a second groove of a cylindrical feedstock in the present embodiment; and

FIGS. 4 and 5 are cross-sectional views illustrating cross-sectional configurations of a first groove of the cylindrical feedstock at different locations.

Detailed Description

The invention is described in detail below with reference to the following figures and examples:

referring to fig. 2, an embodiment of the method for manufacturing a long sleeve of the present invention sequentially comprises the following steps: first, step 51 is to prepare a cylindrical raw material 6 with a predetermined size, wherein the cylindrical raw material 6 has a first end 61 and a second end 62 opposite to each other. It should be noted that, in the embodiment, the columnar material 6 is described as a cylinder, and if it is required to manufacture a long sleeve with other shape, the columnar material 6 with other shape can be selected according to the requirement or the mold condition. In addition, the design of the mold is the prior knowledge of those skilled in the art, and those skilled in the art can naturally design the corresponding mold according to the description of the embodiment of the present invention, so that further description of the mold is not repeated herein.

Next, step 52 is to form a first chamfer 611 on the first end 61 of the cylindrical raw material 6; in step 53, the first end 61 and the second end 62 of the cylindrical raw material 6 are inverted, and then a first concave 612 is formed at the first end 61 of the cylindrical raw material 6, and a second chamfer 621 is formed at the second end 62 of the cylindrical raw material 6. It should be noted that the operation 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 the same and will not be described in addition.

Step 54 is to form a second concave recess 622 at the second end 62 of the cylindrical raw material 6, and press the first end 61 of the cylindrical raw material 6 along the first concave recess 612 to form a first groove 613 extending from the first end 61 toward the second end 62. At this time, since the solid material around the first groove 613 is only primarily extruded to form the first groove 613, and a certain thickness is still remained, the columnar raw material 6 has a relatively good support property as a whole.

Step 55 is to invert the first end 61 and the second end 62 of the cylindrical raw material 6 and forge the cylindrical raw material 6, so that the cylindrical raw material 6 has a head 63 extending from the second end 62 to the first end 61, a rod 64 extending from the first end 61 to the head 63, and a neck 65 integrally connected between the head 63 and the rod 64. Since the solid material portion of the stem 64 is still maintained at a certain thickness, the stem 64 having a narrower diameter than the original diameter of the cylindrical stock 6 is still sufficient to withstand the strong force without skewing when the second end 62 of the cylindrical stock 6 is subjected to a strong force to forge it to form the head 63 having a wider diameter than the original diameter of the cylindrical stock 6. The cross section of the necking part 65 is tapered from the head part 63 to the rod part 64, so that the head part 63 can extend to the rod part 64 in a curve through the necking part 65, and the structural strength is optimized.

Referring to fig. 2 and 3, step 56 is to extrude the second end 62 of the cylindrical raw material 6 along the second recess 622 (as shown in steps 54 and 55), so as to form a second groove 623 having a quadrangular cross section and extending from the second end 62 toward the rod portion 64, and a partition wall 66 between the second groove 623 and the first groove 613.

Referring to fig. 2 to 5, in step 57, the first groove 613 is pressed, so that the first groove 613 forms a first section 614 extending from the first end 61 toward the second end 62 and a second section 615 extending from the first section 614 toward the second end 62; and compresses the second recess 623 to form a circular segment 624 extending a distance from the dividing wall 66 toward the second end 62. The first section 614 has a hexagonal cross section and is formed only after step 57, and the second section 615 and the circular section 624 have circular cross sections and are formed while the first section 614 is formed and the original cross section of the first groove 613 is maintained. Finally, in step 58, the partition wall 66 is removed to connect the first groove 613 and the second groove 623, thereby completing the fabrication of the long sleeve.

In the conventional specification of the long sleeve in the related art, the present embodiment is applied to the case where the ratio of the diameters and widths of the head portion 63 and the rod portion 64 is 1.3-1.6: 1. When the diameter width of the head 63 needs to be increased, a larger forging force is applied in the step 55, and in the case that the first groove 613 needs to form the first section 614 and the second section 615, the first groove 613 is extruded after forging, so that the stem 64 has a better supporting force during forging, and the situation that the stem 64 is inclined due to insufficient supporting force is effectively avoided, so that the manufacturing yield and quality can be effectively improved, particularly, the yield problem caused by adopting the prior art is effectively improved when the ratio of the diameter width of the head 63 to the diameter width of the stem 64 is between 1.3 and 1.6.

Claims

1. A method for manufacturing a long sleeve sequentially comprises the following steps:

(A) preparing a cylindrical raw material with a preset size, wherein the cylindrical raw material is provided with a first end and a second end which are opposite;

(B) forming a first chamfer on the first end of the columnar raw material; the method is characterized in that: the manufacturing method of the long sleeve further comprises the following steps:

(C) forming a first pit at the first end of the columnar raw material, and forming a second chamfer at the second end of the columnar raw material;

(D) forming a second pit at the second end of the columnar raw material, and extruding the first end of the columnar raw material along the first pit to form a first groove extending from the first end to the second end;

(E) forging the columnar raw material to enable the columnar raw material to be provided with a head part extending from the second end to the first end, a rod part extending from the first end to the head part, and a necking part integrally connected between the head part and the rod part, wherein the section of the necking part is gradually reduced from the head part to the rod part;

(F) extruding the second end of the columnar raw material along the second pit to form a second groove extending from the second end towards the rod part, and a partition wall between the second groove and the first groove;

(G) extruding the first groove to form a first section with a polygonal section and extending from the first end to the second end, and a second section with a circular section and extending from the first section to the second end; and

(H) removing the partition wall to communicate the first groove and the second groove;

the ratio of the diameter width of the head part to the diameter width of the shaft part is between 1.3 and 1.6.

2. The method of manufacturing an elongated sleeve according to claim 1, wherein: and (C) after the first end and the second end of the columnar raw material in the step (B) are inverted, forming the first concave pit at the first end of the columnar raw material, and forming the second chamfer at the second end of the columnar raw material.

3. The method of manufacturing an elongated sleeve according to claim 1, wherein: and (E) upsetting the first end and the second end of the columnar material after the step (D) and forging the columnar material.

4. The method of manufacturing an elongated sleeve according to claim 1, wherein: the cross section of the first groove in the step (D) is round.

5. The method of manufacturing an elongated sleeve according to claim 1, wherein: the cross section of the second groove in the step (F) is polygonal.

6. The method of manufacturing an elongated sleeve according to claim 5, wherein: the step (G) also compresses the second groove to form a circular segment extending a distance from the divider wall toward the second end.