CN112170607B - Cold machining process of shock absorber positioning tube - Google Patents

Cold machining process of shock absorber positioning tube Download PDF

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Publication number
CN112170607B
CN112170607B CN202010864729.9A CN202010864729A CN112170607B CN 112170607 B CN112170607 B CN 112170607B CN 202010864729 A CN202010864729 A CN 202010864729A CN 112170607 B CN112170607 B CN 112170607B
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hole
pipe body
piston
sleeve
forming die
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CN112170607A (en
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艾辉
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Chongqing Junchenxi Machinery Manufacturing Co ltd
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Chongqing Junchenxi Machinery Manufacturing Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention discloses a cold machining process of a shock absorber positioning tube, which comprises the following steps: s1: preparing a clean pipe body, wherein the pipe body is used for preparing a positioning pipe; s2: necking one end of the pipe body to a designed necking size so that the outer diameter of a necking section of the pipe body reaches the pipe body size of a positioning pipe finished product; s3: and putting the pipe body subjected to necking treatment into a forming die, and driving the processing die to simultaneously push and pull the pipe body in the forming die by adopting a squeezing cylinder to realize the diameter reduction and the wall thickness reduction of the pipe body in the forming die to obtain the finished positioning pipe. According to the invention, the steel pipe with larger size is adopted for cold machining of the positioning pipe, the extrusion cylinder drives the machining die to push and pull the pipe body in the forming die simultaneously so as to realize diameter reduction and wall thickness reduction of the pipe body, the phenomenon that the pipe body of the pipe body is broken is avoided, the obtained first hollow connector of the positioning pipe can be flared to the designed size completely, the generation of waste products is effectively avoided, and the yield is greatly improved.

Description

Cold machining process of shock absorber positioning tube
Technical Field
The invention relates to the technical field of shock absorbers, in particular to a cold machining process of a shock absorber positioning pipe.
Background
In the field of motorcycles, the shock absorber is an integral part of the motorcycle, and the positioning tube in the shock absorber is an indispensable part. The positioning pipe comprises a first hollow connector, a pipe body and a second hollow connector which are sequentially connected with the axial center line, the size of the first hollow connector is larger than that of the second hollow connector, and the outer diameter of the pipe body is the same as that of the second hollow connector. However, in actual production, the first hollow connector still needs to be flared to a designed size, but the first hollow connector is easily cracked in the flaring process due to the limitation of the size of the first hollow connector, so that the yield is extremely low; when the steel pipe with larger size is adopted to carry out the unidirectional extrusion cold processing of the positioning pipe, the section reduction rate of the pipe body processed to the design size by the steel pipe with larger size exceeds the section reduction limit, so that the steel pipe directly becomes a waste product.
Disclosure of Invention
Aiming at the problems, the invention provides a cold machining process of the positioning pipe of the shock absorber, which adopts a steel pipe with larger size to carry out cold machining on the positioning pipe, thereby effectively avoiding the generation of waste products, and the first hollow connector of the positioning pipe can be flared to the designed size completely, thereby greatly improving the yield.
The invention provides a cold machining process of a shock absorber positioning tube, which comprises the following steps:
s1: preparing a clean pipe body for preparing a positioning pipe;
s2: necking one end of the pipe body to a designed necking size so that the outer diameter of a necking section of the pipe body reaches the pipe body size of a positioning pipe finished product;
s3: and (3) putting the pipe body subjected to necking treatment into a forming die, and driving the processing die to simultaneously push and pull the pipe body in the forming die by adopting an extruding and drawing cylinder, so that the diameter and the wall thickness of the pipe body in the forming die are reduced, and the finished positioning pipe is obtained.
Preferably, in step S3, the processing mold includes an extrusion sleeve and a core rod, the extrusion sleeve is movably sleeved on the core rod, and the extrusion sleeve and the core rod are both connected with the extrusion cylinder; the extrusion cylinder is used for controlling the synchronous action of the extrusion sleeve and the core rod; or the squeezing cylinder is used for controlling the squeezing sleeve or the core rod to act independently.
Preferably, the extruding and drawing cylinder comprises a cylinder barrel, a piston sleeve, a first piston and a second piston, wherein cover plates and connecting flanges are arranged at two ends of the cylinder barrel, and oil inlet holes are formed in the cover plates; the first piston is positioned in the cylinder barrel and matched with the cylinder barrel in a sliding sealing mode, the first piston is provided with a communicating hole which is coaxial with the oil inlet hole, the piston sleeve is positioned in the cylinder barrel, one end of the piston sleeve is connected with the first piston, one end of the piston sleeve protrudes out of the connecting flange and is connected with an auxiliary plate, the piston sleeve is connected with the inner ring of the connecting flange in a sliding sealing mode, and a first cavity is formed between the piston sleeve and the cylinder barrel; the second piston is positioned in the piston sleeve and is in sliding seal fit with the piston sleeve, a through hole is formed in the auxiliary plate, one end of the core rod is connected with the second piston, the other end of the core rod is in sliding fit with the through hole penetrating through the auxiliary plate, and the extrusion sleeve is connected with the auxiliary plate; the cylinder barrel is provided with an oil outlet hole close to the connecting flange, and the piston sleeve is provided with a connecting channel for oil inlet or oil outlet.
Preferably, the cylinder barrel, the piston sleeve, the first piston, the second piston, the extrusion sleeve and the core rod are arranged coaxially with the central line.
Preferably, the auxiliary plate is provided with a connecting piece, the connecting piece comprises a reinforcing block and a connecting block, the end surface of the back piston sleeve of the auxiliary plate is provided with an inwards concave reinforcing groove, the reinforcing block is provided with a through hole which penetrates through the reinforcing block along the axial direction of the core rod, the core rod and the through hole of the reinforcing block are matched with the central shaft in a movable manner, and the reinforcing groove of the auxiliary plate is matched with the reinforcing block; the end surface of the back auxiliary plate of the reinforcing block is provided with a limiting groove which is concentric with the through hole of the reinforcing block, one end of the extrusion sleeve is provided with an annular block, and the annular block of the extrusion sleeve is matched with the limiting groove of the reinforcing block; the connecting block is provided with a through hole which is movably matched with the extrusion sleeve, the end face of the connecting block, close to the auxiliary plate, is provided with a clamping groove, the part of the reinforcing block, which protrudes out of the auxiliary plate, is matched with the clamping groove of the connecting block, the connecting block is connected with the auxiliary plate, and the annular block of the extrusion sleeve is limited in a space surrounded by the limiting grooves of the connecting block and the reinforcing block.
Preferably, the forming die is provided with a placing hole and a forming hole which are coaxial with the axial center line and communicated with each other, and the placing hole and the forming hole are coaxial with the axial center line of the core rod; a forming hole of the forming die is internally provided with a forming die, and the stepped end surface formed by the placing hole and the forming hole is abutted against the forming die; the forming die is provided with a transition hole and a forming hole which are communicated, the transition hole is conical, the diameter of the large diameter end of the transition hole is the same as that of the placing hole, the diameter of the small diameter end of the transition hole is the same as that of the forming hole, and the placing hole, the transition hole and the forming hole are coaxial with the central line.
Preferably, an annular column is arranged in a forming hole of the forming die, the inner diameter of the annular column is larger than that of the forming hole, and the annular column and the forming die are of an integral structure.
Preferably, the transition hole has a cone angle of 30 ° to 120 °.
The invention has the following beneficial effects:
according to the technical scheme, the steel pipe with larger size is adopted for cold machining of the positioning pipe, the extrusion cylinder drives the machining die to push and pull the pipe body in the forming die simultaneously, so that the diameter and the wall thickness of the pipe body are reduced, the phenomenon that the pipe body of the pipe body is broken is avoided, the obtained first hollow connector of the positioning pipe can be flared to the designed size completely, waste products are effectively avoided, and the yield is greatly improved.
Drawings
FIG. 1 is a schematic view of a combination of a cylinder, a forming mold and a processing mold in a tube according to an embodiment of the present invention;
FIG. 2 is a schematic view of the first and second pistons of FIG. 1;
FIG. 3 is a schematic view of a structure of the tube body abutting against the core rod in the forming die according to an embodiment of the present invention;
FIG. 4 is a schematic structural view illustrating the extrusion sheath and the core rod respectively pushing and pulling the tube body in the forming die according to an embodiment of the present invention;
FIG. 5 is a schematic structural view illustrating the extrusion sleeve and the core rod pushing and pulling the tubular body in the forming die to a finished product according to an embodiment of the present invention;
FIG. 6 is a schematic view of the structure of the shock absorber positioning tube.
Reference numerals:
1-pipe body, 2-forming die, 21-placing hole, 22-forming hole, 23-forming die, 231-transition hole, 232-forming hole, 24-annular column, 3-processing die, 31-extrusion sleeve, 311-annular block, 32-core rod, 4-extrusion cylinder, 41-cylinder barrel, 411-cover plate, 412-connecting flange, 413-oil inlet hole, 414-oil outlet hole, 42-piston sleeve, 421-connecting channel, 43-first piston, 431-communicating hole, 44-second piston, 45-third piston, 46-auxiliary plate, 461-reinforcing groove, 47-connecting piece, 471-reinforcing block, 4711-limiting groove, 472-connecting block, 4721-clamping groove, 5-frame, 51-first fixing plate and 52-second fixing plate.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The outer diameter of the first hollow connector of the finished product shock absorber positioning pipe is recorded as D1, the outer diameter of the pipe body is recorded as D2, the inner diameter of the pipe body is recorded as D1, and the inner diameter of the second hollow connector is recorded as D2.
In actual production, a raw material steel pipe (with the outer diameter of 19mm and the wall thickness of 4 mm) is adopted for processing, and the outer diameter of the obtained first hollow connector is 19mm; according to the requirements of users, the first hollow connector is required to be flared to an outer diameter of 25mm-28mm, and the first hollow connector with the outer diameter of 19mm is broken in the process; the skilled person will carefully consider that it is decided to use 20# steel pipe (22 mm outside diameter, 3mm wall thickness) for the machining, sinceThe outer diameter of the first hollow connector with the outer diameter of 22mm can be stably flared to 25mm-28mm; the outer diameter of a first hollow connector of the finished product positioning pipe is marked as D1, D1 is 22mm, the outer diameter of a pipe body is marked as D2, D2 is 14mm, the inner diameter of the pipe body is marked as D1, D1 is 11mm, the inner diameter of a second hollow connector is marked as D2, and D2 is 8mm; the reduction ratio of the cross section is ((D1) 2 -D2 2 )/(D1 2 -d1 2 ) 100% of the total weight of the steel pipe, and a 20# steel pipe (22 mm in outside diameter and 3mm in wall thickness) having a reduction in cross-section of ((22) in thickness 2 -14 2 )/(22 2 -11 2 ) 100% =79.34%, and the reduction rate of the cross section of the 20# steel pipe in the forward extrusion is less than 75%, so that the 20# steel pipe (with the outer diameter of 22mm and the wall thickness of 3 mm) cannot be processed into a finished positioning pipe by unidirectional forward extrusion. In addition, the core rod is used for acting on the necking section of the pipe body to perform unidirectional pulling, so that the pipe body is broken.
As shown in fig. 1 to 6, in order to solve the above-mentioned problems, the present embodiment provides a cold working process of a damper positioning tube, including the following steps:
s1: preparing a clean pipe body, wherein the pipe body is used for preparing a positioning pipe;
s2: necking one end of the pipe body 1 to a designed necking size to enable the outer diameter of a necking section of the pipe body 1 to reach the pipe body size of a positioning pipe finished product;
s3: and (3) putting the pipe body 1 subjected to necking treatment into a forming die 2, and simultaneously pushing and pulling the pipe body 1 in the forming die 2 by adopting a squeezing cylinder 4 to drive a processing die 3, so that the diameter and the wall thickness of the pipe body in the forming die are reduced, and the finished positioning pipe is obtained.
According to the technical scheme, the steel pipe with larger size is adopted for cold machining of the positioning pipe, the extrusion cylinder 4 drives the machining die 3 to simultaneously push and pull the pipe body 1 in the forming die 4, so that the diameter and the wall thickness of the pipe body 1 are reduced, the phenomenon that the pipe body of the pipe body 1 is broken is avoided, the obtained first hollow connector of the positioning pipe can be completely flared to the designed size, waste products are effectively avoided, and the yield is greatly improved.
As shown in fig. 1, in step S3, the processing mold 3 includes an extrusion sleeve 31 and a core rod 32, the extrusion sleeve 31 is movably sleeved on the core rod 32, and both the extrusion sleeve 31 and the core rod 32 are connected to the pultrusion cylinder 4; the extrusion cylinder 4 is used for controlling the extrusion sleeve 31 and the core rod 32 to synchronously act; or the extrusion cylinder 4 is used for controlling the independent action of the extrusion sleeve 31 or the core rod 32.
Specifically, the pultrusion cylinder 4 comprises a cylinder tube 41, a piston sleeve 42, a first piston 43 and a second piston 44, wherein a cover plate 411 and a connecting flange 412 are arranged at two ends of the cylinder tube 41, and an oil inlet 413 is arranged on the cover plate 411; the first piston 43 is positioned in the cylinder 41 and is in sliding seal fit, the first piston 43 is provided with a communicating hole 431 which is coaxial with the oil inlet 413, the piston sleeve 42 is positioned in the cylinder 41, one end of the piston sleeve 42 is connected with the first piston 43, one end of the piston sleeve 42 protrudes out of the connecting flange 412 and is connected with the auxiliary plate 46, the piston sleeve 42 is in sliding seal connection with the inner ring of the connecting flange 412, and a first cavity is formed between the piston sleeve 42 and the cylinder 41; the second piston 44 is positioned in the piston sleeve 42 and is in sliding sealing fit, a through hole is formed in the auxiliary plate 46, one end of the core rod 32 is connected with the second piston 44, the other end of the core rod 32 is in sliding fit with the through hole penetrating through the auxiliary plate 46, the core rod 32 is in sliding fit with the through hole of the auxiliary plate 46, and the extrusion sleeve 31 is connected with the auxiliary plate 46; the cylinder 41 is provided with an oil outlet 414 near the connecting flange, and the piston sleeve 42 is provided with a connecting passage 421 for oil inlet or oil outlet. Furthermore, the cylinder 41, the piston sleeve 42, the first piston 43, the second piston 44, the pressing sleeve 31, and the core rod 32 are arranged coaxially with the center line.
The connecting passage 421 of the piston sleeve 42, the oil outlet 414 of the cylinder 41 and the oil inlet 413 of the cover plate 411 are connected with a hydraulic oil station through connecting pipes. As shown in fig. 2 and 3, when hydraulic oil is fed from the oil inlet 413 of the cover plate 411, the connecting passage 421 of the piston sleeve 42 and the oil outlet 414 of the cylinder 41 discharge the hydraulic oil, and the hydraulic oil fed from the oil inlet 413 of the cover plate 411 acts on the second piston 44 to press the front end of the core rod 32 against the tapered section of the pipe body 1 in the forming die 2, so that the pressing force forms a positive pulling force to the pipe body with respect to the pipe body 1; secondly, due to the fluidity of the hydraulic oil, when the front end of the core rod 32 is prevented from moving forward continuously by pressure, the hydraulic oil continuously input from the oil inlet 413 of the cover plate 411 drives the first piston 43 to drive the piston sleeve 42 to approach the forming die 2, so that the corresponding end of the extrusion sleeve 31 and the corresponding end of the pipe body 1 in the forming die 2 abut against each other to apply a positive extrusion force; again, as shown in fig. 4 and 5, when the hydraulic oil is continuously supplied from the oil supply hole 413 of the cover plate 411, since the first oil chamber formed by the cylinder 41, the first piston 43, and the cover plate 411 and the second oil chamber formed by the piston sleeve 42, the second piston 44, and the first piston 43 are communicated through the communication hole 431 of the first piston 43, when the force applied to the core rod 32 is large, the first piston 43 may be driven to press the pressing sleeve 31 toward the corresponding end of the tube body; when the extrusion sleeve 31 is stressed greatly, the second piston 44 can be driven to enable the core rod 32 to abut against the necking inclined section of the pipe body, so that a pulling force is generated on the pipe body; finally, ejecting the processed pipe body through an ejector rod in the forming die 2 to obtain a finished positioning pipe, as shown in fig. 6; therefore, the extrusion cylinder 4 acts on the pipe body 1 in the forming die 2, so that the pipe body is subjected to positive extrusion force and positive tension force in the machining process, the phenomenon that the independent positive extrusion force exceeds the end face reduction rate standard is effectively solved, the phenomenon that the necking section of the pipe body 1 is pulled in a single direction by the core rod 32 is independently adopted, the pipe body is broken, the positioning pipe with the first hollow connector meeting the requirement of a user is obtained, and the product quality and the production rate are guaranteed.
Furthermore, a connecting piece 47 is arranged on the auxiliary plate 46, the connecting piece 47 comprises a reinforcing block 471 and a connecting block 472, an inward concave reinforcing groove 461 is arranged on the end face of the back piston sleeve of the auxiliary plate 46, the reinforcing block 471 is provided with a through hole which penetrates through the core rod axially, the core rod 32 and the through hole of the reinforcing block 471 are concentric and movably matched, and the reinforcing groove 461 of the auxiliary plate 46 is matched with the reinforcing block 471; the end face of the back auxiliary plate of the reinforcing block 471 is provided with a limit groove 4711 which is concentric with the through hole of the reinforcing block 471, one end of the extrusion sleeve 31 is provided with a ring-shaped block 311, and the ring-shaped block 311 of the extrusion sleeve 31 is matched with the limit groove 4711 of the reinforcing block 471; the connecting block 472 is provided with a through hole movably matched with the extrusion sleeve 31, the end face, close to the auxiliary plate, of the connecting block 472 is provided with a clamping groove 4721, the part, protruding out of the auxiliary plate 46, of the reinforcing block 471 is matched with the clamping groove 4721 of the connecting block 472, the connecting block 472 is connected with the auxiliary plate 46, and the annular block 311 of the extrusion sleeve 31 is limited in a space defined by the connecting block 472 and a limiting groove 4711 of the reinforcing block 471.
Further, the forming die 2 is provided with a placing hole 21 and a forming hole 22 which are coaxial with the same axial center line and are communicated, and the placing hole 21 and the forming hole 22 are coaxial with the same axial center line of the core rod 32; a forming die 23 is arranged in the forming hole 21 of the forming die 2, and the stepped end surface formed by the placing hole 21 and the forming hole 22 is abutted against the forming die 23; the forming die 23 is provided with a transition hole 231 and a forming hole 232 which are communicated with each other, the transition hole 231 is tapered, the large diameter end of the transition hole 231 is the same as the diameter of the placement hole 21, the small diameter end of the transition hole 231 is the same as the diameter of the forming hole 22, and the placement hole 21, the transition hole 231 and the forming hole 232 are coaxial with the axial center line. An annular column 24 is arranged in the forming hole 22 of the forming die 2, the inner diameter of the annular column 24 is larger than that of the forming hole 232, and the annular column 24 and the forming die 23 are of an integral structure. In addition, the transition hole 231 has a taper angle of 30-120.
It should be noted that the present invention further includes a frame 5, wherein the frame 5 is provided with a first fixing plate 51 and a second fixing plate 52, the connecting flange 412 of the cylinder 41 is connected to the first fixing plate 51, and the forming mold 2 is connected to the second fixing plate 52. The first fixing plate 51 is provided with a through hole concentric with the connecting flange 412, and the through hole of the first fixing plate 51 is slidably fitted to the piston sleeve 42. Moreover, a third piston 45 is arranged in the piston sleeve 42, the circumference of the third piston 45 is connected with the inner wall of the piston sleeve 42, the third piston 45 is provided with a through hole which penetrates through transversely, the core rod 32 is connected with the through hole of the third piston 45 in a sliding and sealing manner, the far oil station end of the connecting channel 421 is positioned between the second piston 44 and the third piston 45, and the third piston 45 has a limiting effect and supports the core rod 32 well.
It should be noted that the above preferred embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being covered by the appended claims and their equivalents.

Claims (5)

1. A cold working process of a shock absorber positioning tube is characterized by comprising the following steps:
s1: preparing a clean pipe body, wherein the pipe body is used for preparing a positioning pipe;
s2: necking one end of the pipe body to a designed necking size so that the outer diameter of a necking section of the pipe body reaches the pipe body size of a positioning pipe finished product;
s3: putting the pipe body after necking treatment into a forming die, and driving a processing die to simultaneously push and pull the pipe body in the forming die by adopting a squeezing cylinder to realize the diameter reduction and the wall thickness reduction of the pipe body in the forming die to obtain a finished positioning pipe;
the squeezing cylinder comprises a cylinder barrel, a piston sleeve, a first piston and a second piston, a cover plate and a connecting flange are arranged at two ends of the cylinder barrel, and an oil inlet hole is formed in the cover plate; the first piston is positioned in the cylinder barrel and matched with the cylinder barrel in a sliding sealing mode, the first piston is provided with a communicating hole which is coaxial with the oil inlet hole, the piston sleeve is positioned in the cylinder barrel, one end of the piston sleeve is connected with the first piston, the other end of the piston sleeve protrudes out of the connecting flange and is connected with an auxiliary plate, the piston sleeve is connected with the inner ring of the connecting flange in a sliding sealing mode, and a first cavity is formed between the piston sleeve and the cylinder barrel; the second piston is positioned in the piston sleeve and is in sliding seal fit, the auxiliary plate is provided with a through hole, one end of the core rod is connected with the second piston, the other end of the core rod is in sliding fit with the through hole penetrating out of the auxiliary plate, and the extrusion sleeve is connected with the auxiliary plate; the side of the cylinder barrel, close to the connecting flange, is provided with an oil outlet, the piston sleeve is provided with a connecting channel for oil inlet or oil outlet, the cylinder barrel, the piston sleeve, the first piston, the second piston, the extrusion sleeve and the core rod are arranged along the same axial center line, the auxiliary plate is provided with a connecting piece, the connecting piece comprises a reinforcing block and a connecting block, the end face of the back piston sleeve of the auxiliary plate is provided with an inwards concave reinforcing groove, the reinforcing block is provided with a through hole which penetrates through the core rod in the axial direction, the through holes of the core rod and the reinforcing block are the same as the center axis and are in movable fit, and the reinforcing groove of the auxiliary plate is matched with the reinforcing block; the end surface of the back auxiliary plate of the reinforcing block is provided with a limiting groove which is concentric with the through hole of the reinforcing block, one end of the extrusion sleeve is provided with an annular block, and the annular block of the extrusion sleeve is matched with the limiting groove of the reinforcing block; the connecting block is provided with a through hole which is movably matched with the extrusion sleeve, the end face of the connecting block, close to the auxiliary plate, is provided with a clamping groove, the part of the reinforcing block, protruding out of the auxiliary plate, is matched with the clamping groove of the connecting block, the connecting block is connected with the auxiliary plate, and the annular block of the extrusion sleeve is limited in a space which is enclosed by the limiting grooves of the connecting block and the reinforcing block.
2. The cold working process of a shock absorber positioning tube as claimed in claim 1, wherein:
in the step S3, the processing mould comprises an extrusion sleeve and a core rod, the extrusion sleeve is movably sleeved on the core rod, and the extrusion sleeve and the core rod are both connected with an extrusion cylinder; the extrusion cylinder is used for controlling the synchronous action of the extrusion sleeve and the core rod; or the squeezing cylinder is used for controlling the squeezing sleeve or the core rod to independently act.
3. The cold working process of a shock absorber positioning tube as claimed in claim 1, wherein:
the forming die is provided with a placing hole and a forming hole which are coaxial with the axial center line and communicated with each other, and the placing hole and the forming hole are coaxial with the axial center line of the core rod; a forming die is arranged in a forming hole of the forming die, and a stepped end face formed by the placing hole and the forming hole is abutted against the forming die; the forming die is provided with a transition hole and a forming hole which are communicated, the transition hole is conical, the diameter of the large diameter end of the transition hole is the same as that of the placing hole, the diameter of the small diameter end of the transition hole is the same as that of the forming hole, and the placing hole, the transition hole and the forming hole are coaxial with the same axial center line.
4. A cold working process of a shock absorber positioning tube according to claim 3, wherein:
and an annular column is arranged in a forming hole of the forming die, the inner diameter of the annular column is larger than that of the forming hole, and the annular column and the forming die are of an integrated structure.
5. A cold working process of a shock absorber positioning tube according to claim 3, wherein:
the taper angle of the transition hole is 30-120 degrees.
CN202010864729.9A 2020-08-25 2020-08-25 Cold machining process of shock absorber positioning tube Active CN112170607B (en)

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Application Number Priority Date Filing Date Title
CN202010864729.9A CN112170607B (en) 2020-08-25 2020-08-25 Cold machining process of shock absorber positioning tube

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Application Number Priority Date Filing Date Title
CN202010864729.9A CN112170607B (en) 2020-08-25 2020-08-25 Cold machining process of shock absorber positioning tube

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CN112170607B true CN112170607B (en) 2023-01-20

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10277630A (en) * 1997-03-31 1998-10-20 Kayaba Ind Co Ltd Method for plastically working pipe material
CN101754820B (en) * 2007-06-29 2012-12-12 Gkn动力传动系统国际有限责任公司 Device and method for the axial forming of elongated hollow bodies
JP5430159B2 (en) * 2009-01-28 2014-02-26 日新製鋼株式会社 Manufacturing method of different diameter steel pipe
CN201389572Y (en) * 2009-05-05 2010-01-27 钱宗富 Pipe cold extrusion reducing device
CN201755368U (en) * 2009-12-16 2011-03-09 东莞市昶泰五金制品有限公司 Roller and treadmill using roller
KR102062076B1 (en) * 2016-03-11 2020-01-03 닛폰세이테츠 가부시키가이샤 Manufacturing method of steel pipe with different thickness and steel pipe with different thickness
CN106925621B (en) * 2017-04-28 2018-06-12 重庆市永川区益锐机械有限责任公司 Drawing copper tubes device
CN111299979B (en) * 2020-03-24 2021-11-23 重庆志齐机械制造有限公司 Preparation process of cold extrusion piston tube

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