CN114953273A - Plastic deformation fluid polishing method suitable for pipe drawing core head - Google Patents
Plastic deformation fluid polishing method suitable for pipe drawing core head Download PDFInfo
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- CN114953273A CN114953273A CN202011123534.5A CN202011123534A CN114953273A CN 114953273 A CN114953273 A CN 114953273A CN 202011123534 A CN202011123534 A CN 202011123534A CN 114953273 A CN114953273 A CN 114953273A
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- China
- Prior art keywords
- plastic deformation
- pipe
- polishing
- drawing core
- aluminum alloy
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
Abstract
The invention relates to a plastic deformation fluid polishing method suitable for a pipe drawing core print, belongs to the technical field of mold polishing processing, and can be used for polishing the outer surface of the pipe drawing core print with the outer diameter of 40-120 mm. The adopted process steps are as follows: mechanical polishing → plastic deformation fluid polishing → nitriding heat treatment. The pipe drawing core head after plastic deformation fluid polishing is used for drawing and processing the pipe, so that the surface roughness of the inner surface of the drawn pipe can be reduced, and the surface quality of the inner surface of the pipe is improved.
Description
Technical Field
The invention relates to a plastic deformation fluid polishing method suitable for a pipe drawing core print, and belongs to the technical field of mold polishing processing. The polishing method is suitable for polishing the outer surface of the pipe drawing core print with the outer diameter of 40mm to 120 mm.
Background
The surface roughness is an important index for evaluating the surface quality of the metal pipe, and the quality of the working surface of the drawing core head of the pipe is one of the key factors influencing the roughness of the inner surface of the pipe. In order to improve the quality of the inner surface of the metal pipe and reduce the friction loss, mechanical polishing and surface nitriding treatment are generally required to be carried out on the pipe drawing core print.
When observing the cold drawing process of the aluminum pipe, the inventor finds that the roughness of the inner surface of the drawn pipe is obviously reduced after the core print is used for a period of time, and the roughness of the inner surface of the drawn pipe is continuously increased along with the continuous use of the core print after the core print is stabilized for a period of time. This phenomenon indicates that after the tube drawing core is used for a period of time, the surface roughness of the inner surface of the drawn tube can be significantly reduced by the appearance formed on the working surface of the core, because the plastic deformation fluid of the drawing material also grinds and polishes the outer surface of the drawing core while the drawing material is plastically deformed, a micro-appearance which is beneficial to metal flow is gradually formed on the outer surface of the core, and the macro-appearance is that the surface roughness of the inner surface of the drawn tube is significantly reduced. According to the phenomenon, a new method for polishing the pipe drawing core print, namely performing plastic deformation fluid polishing on the pipe drawing core print, can be obtained. The method comprises the steps of performing pipe drawing by using a core print subjected to mechanical polishing, stopping drawing when the roughness of the inner surface of the drawn pipe is reduced to a stable value, and performing nitriding treatment on the core print to strengthen the surface of a die. Namely, the surface treatment process of the traditional pipe drawing core head is modified from mechanical polishing → surface nitriding to mechanical polishing → plastic deformation fluid polishing → surface nitriding. The pipe drawing core print processed by the modified process can be used for preparing drawn pipes with low inner surface roughness and can be used for drawing and processing finished pipes in the last pass.
The pipe used for carrying out plastic deformation fluid polishing on the core print can be regarded as an intermediate product after polishing is finished, and the intermediate product is used as a blank to continuously produce the pipe of the next specification. And can also be used as a finished pipe with low requirement on the roughness of the inner surface.
Disclosure of Invention
The invention aims to provide a plastic deformation fluid polishing method suitable for a pipe drawing core head.
In order to achieve the purpose, the invention adopts the following technical scheme:
a plastic deformation fluid polishing method suitable for a tube drawing core head, comprising the following steps:
(1) mechanical polishing: mechanically polishing the outer surface of a pipe drawing core print with the outer diameter of 40 mm-120 mm until the surface roughness is R a 0.2。
(2) Plastic deformation fluid polishing: the method is characterized in that a 6063 aluminum alloy or 5A02 aluminum alloy tube blank is used as a raw material, a mechanically polished tube drawing core head is used for tube drawing, the aluminum alloy tube blank is subjected to plastic deformation in the drawing process, the plastic deformation fluid grinds and polishes the outer surface of the core head, the micro-morphology beneficial to metal flowing is gradually formed on the outer surface of the core head, and the macro-morphology is that the surface roughness of the inner surface of the drawn aluminum alloy tube is gradually reduced. And stopping drawing when the roughness of the inner surface of the aluminum alloy pipe to be drawn is reduced to Ra0.4-Ra0.8.
(3) Nitriding heat treatment: and carrying out ion nitriding heat treatment on the pipe drawing core head polished by the aluminum alloy plastic deformation fluid, so as to improve the surface hardness and the wear resistance of the pipe drawing core head.
A preferred technical scheme is characterized in that: the material of the pipe drawing core head in the steps (1), (2) and (3) is cold-work die steel Cr12 MoV.
A preferred technical scheme is characterized in that: the ion nitriding heat treatment process in the step (3) is carried out at the temperature of 510-530 ℃ for 5-7 hours.
The beneficial effects of the invention are as follows: the pipe drawing core head after plastic deformation fluid polishing is used for drawing and processing the pipe, so that the surface roughness of the inner surface of the drawn pipe can be reduced, and the surface quality of the inner surface of the pipe is improved.
Drawings
Fig. 1 is a schematic structural diagram of a tube drawing core (cylindrical core).
Detailed Description
The present invention is further illustrated by the following specific embodiments.
Example 1
Plastic deformation fluid polishing of a pipe drawing core head with the outer diameter of 40 mm:
(1) mechanical polishing: mechanically polishing the outer surface of the Cr12MoV pipe drawing core print with the outer diameter of 40mm until the surface roughness is R a 0.2。
(2) Plastic deformation fluid polishing: a6063 aluminum alloy tube blank is used as a raw material, a mechanically polished tube drawing core head is used for tube drawing, the aluminum alloy tube blank is subjected to plastic deformation in the drawing process, and the outer surface of the core head is polished by plastic deformation fluid. And stopping drawing when the roughness of the inner surface of the aluminum alloy pipe to be drawn is reduced to Ra0.4.
(3) Nitriding heat treatment: and carrying out ion nitriding heat treatment on the pipe drawing core head polished by the aluminum alloy plastic deformation fluid, so that the surface hardness and the wear resistance of the pipe drawing core head are improved. The ion nitriding heat treatment process is carried out at the temperature of 510 ℃ for 5 hours.
Example 2
And (3) plastic deformation fluid polishing of the drawing core head of the pipe with the outer diameter of 120 mm:
(1) mechanical polishing: and mechanically polishing the outer surface of the Cr12MoV pipe drawing core print with the outer diameter of 120mm until the surface roughness is Ra0.2.
(2) Plastic deformation fluid polishing: the method is characterized in that a 5A02 aluminum alloy tube blank is used as a raw material, a mechanically polished tube drawing core is used for tube drawing, the aluminum alloy tube blank is subjected to plastic deformation in the drawing process, and the plastic deformation fluid polishes the outer surface of the core. And stopping drawing when the roughness of the inner surface of the aluminum alloy pipe to be drawn is reduced to Ra0.8.
(3) Nitriding heat treatment: and carrying out ion nitriding heat treatment on the pipe drawing core head polished by the aluminum alloy plastic deformation fluid, so that the surface hardness and the wear resistance of the pipe drawing core head are improved. The ion nitriding heat treatment process is carried out at the temperature of 530 ℃ for 7 hours.
Claims (3)
1. A plastic deformation fluid polishing method suitable for a pipe drawing core print can be used for polishing the outer surface of the pipe drawing core print with the outer diameter of 40 mm-120 mm, and comprises the following steps:
(1) mechanical polishing: mechanically polishing the outer surface of a pipe drawing core print with the outer diameter of 40 mm-120 mm until the surface roughness is R a 0.2；
(2) Plastic deformation fluid polishing: the method is characterized in that a 6063 aluminum alloy or 5A02 aluminum alloy tube blank is adopted as a raw material, a mechanically polished tube drawing core head is used for drawing the tube, the aluminum alloy tube blank is subjected to plastic deformation in the drawing process, plastic deformation fluid of the aluminum alloy tube blank grinds and polishes the outer surface of the core head, the outer surface of the core head gradually forms a micro-morphology beneficial to metal flowing, and the macro-morphology is that the surface roughness of the inner surface of the drawn aluminum alloy tube is gradually reduced; stopping drawing when the roughness of the inner surface of the aluminum alloy pipe to be drawn is reduced to Ra0.4-Ra0.8;
(3) nitriding heat treatment: and carrying out ion nitriding heat treatment on the pipe drawing core head polished by the aluminum alloy plastic deformation fluid, so that the surface hardness and the wear resistance of the pipe drawing core head are improved.
2. The method of claim 1 for plastic deformation fluid polishing of a pipe drawing core print, wherein: the material of the pipe drawing core print in the steps (1), (2) and (3) is cold-work die steel Cr12 MoV.
3. The method of claim 1 for plastic deformation fluid polishing of a pipe drawing core print, wherein: the ion nitriding heat treatment process in the step (3) is carried out at the temperature of 510-530 ℃ for 5-7 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011123534.5A CN114953273A (en) | 2020-10-20 | 2020-10-20 | Plastic deformation fluid polishing method suitable for pipe drawing core head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011123534.5A CN114953273A (en) | 2020-10-20 | 2020-10-20 | Plastic deformation fluid polishing method suitable for pipe drawing core head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114953273A true CN114953273A (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011123534.5A Pending CN114953273A (en) | 2020-10-20 | 2020-10-20 | Plastic deformation fluid polishing method suitable for pipe drawing core head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114953273A (en) |
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2020
- 2020-10-20 CN CN202011123534.5A patent/CN114953273A/en active Pending
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