CN111805184A - Method for processing hollow sleeve type part - Google Patents
Method for processing hollow sleeve type part Download PDFInfo
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- CN111805184A CN111805184A CN202010716622.XA CN202010716622A CN111805184A CN 111805184 A CN111805184 A CN 111805184A CN 202010716622 A CN202010716622 A CN 202010716622A CN 111805184 A CN111805184 A CN 111805184A
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- hollow sleeve
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- forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Forging (AREA)
Abstract
The invention provides a method for processing hollow sleeve parts, which comprises the following steps: blanking; forging and pressing the blank; quenching and tempering by heat treatment; shot blasting; magnetic powder inspection; and (5) checking and rust prevention. The processing method has the advantages of few processing procedures, simple operation, low labor intensity, greatly improved yield, strong adaptability, suitability for producing and processing hollow sleeves with different types and specifications, improved quality of processed products and enhanced performance of the products, and meanwhile, the utilization rate of raw materials is improved, the production cost is reduced, and the processing method can be used for mass production and processing of hollow sleeve parts.
Description
Technical Field
The invention relates to the technical field of machining of sleeve type parts, in particular to a method for machining a hollow sleeve type part.
Background
The sleeve pipe is usually used in basement of building to protect the pipeline or to facilitate the iron ring for installing the pipeline. And (3) classifying the sleeves: rigid casing, flexible waterproof casing, steel pipe casing, iron sheet casing, etc. The hollow sleeve is large in usage amount in various industries, various in model specifications, relatively complex in production and processing procedures of the conventional hollow sleeve, low in production and processing efficiency, uneven in quality and high in production cost due to the fact that the various in model specifications and the frequent adjustment of processing parameters are needed. Therefore, it is important to develop a simple and efficient method for machining hollow sleeve parts.
Disclosure of Invention
The invention provides a method for processing hollow sleeve parts, and aims to reduce processing procedures, reduce processing allowance, improve the utilization rate of raw materials, improve the surface quality of a forged piece and enhance the product performance.
In order to achieve the purpose, the invention provides a method for processing hollow sleeve parts, which comprises the following steps:
step 2, forging and pressing the blank:
a first step: heating the blank to 950-1050 ℃ by using an intermediate frequency furnace;
a second step: rapidly removing oxide skin by adopting high-pressure water;
a third step: forging and forming by using an electric screw press to obtain a forged piece;
a fourth step: carrying out thermal correction on the forged piece after forging and pressing;
a fifth step: rapidly cooling the forge piece after thermal correction in an air cooling mode;
step 3, performing thermal treatment quenching and tempering on the forged blank;
step 4, performing shot blasting treatment on the forged piece subjected to thermal treatment tempering;
step 5, machining the forge piece by using a numerical control machine;
step 6, performing magnetic particle inspection on the machined product by using a magnetic particle inspection machine;
and 7, inspecting and preventing rust of the product to obtain a finished product.
Preferably, in the step 2, after heating, the blank is pressed by a punch press to be initially formed.
Preferably, the thermal correction temperature is not less than 800 ℃.
Preferably, the forge piece after thermal correction has no material shortage and crack, and the length error of the forge piece is less than 0.5 mm.
Preferably, the rapid cooling is specifically: firstly, the temperature is reduced to below 500 ℃ by adopting an air cooling mode, and then the temperature is naturally cooled to the room temperature.
Preferably, the quenching and tempering hardness of the forge piece in the step 3 is 23-32 HRC, the tensile strength is greater than or equal to 590MPa, the yield strength is greater than or equal to 295MPa, and the elongation after fracture is greater than or equal to 15%.
Preferably, in the step 4, the shot blasting medium is steel shots S170, and the shot blasting time is 12 min.
Preferably, the magnetic suspension concentration ratio of the magnetic powder inspection is as follows: 0.1-0.4 mL/100mL, the surface intensity of a fluorescent lamp irradiance workpiece is more than or equal to 1000 muW/cm 2, the white light intensity is less than or equal to 20LX, and the magnetic traces in all directions can be clearly displayed when an A-type test piece is tested; the products inspected by visual inspection have no obvious crack defects, and the remanence is less than or equal to 3 gauss.
The scheme of the invention has the following beneficial effects: the processing method has the advantages of few processing procedures, simple operation, low labor intensity, greatly improved yield, strong adaptability, suitability for producing and processing hollow sleeves with different types and specifications, improved quality of processed products and enhanced performance of the products, and meanwhile, the utilization rate of raw materials is improved, the production cost is reduced, and the processing method can be used for mass production and processing of the hollow sleeves.
Drawings
Fig. 1 is a schematic view of a preliminary formed blank in example 1 of the present invention.
Fig. 2 is a schematic view of a forging formed by press forming in section 1 according to the embodiment of the present invention.
Fig. 3 is a schematic view of a forging formed by press forming in section 2 according to the embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Example 1
step 2, forging and pressing the blank:
a first step: heating the blank to 1000 ℃ by using an intermediate frequency furnace;
a second step: pressing the blank by a punch press to preliminarily form the blank with the length of 91mm, as shown in figure 1;
a third step: rapidly removing oxide skin by adopting high-pressure water;
a fourth step: forging and forming by using an electric screw press to obtain a forged piece, wherein the forged piece has no material shortage and no crack as shown in figure 2;
a fifth step: carrying out thermal correction on the forged piece after forging and forming by using an oil press; the thermal correction temperature is not lower than 800 ℃, the forge piece after thermal correction has no defects such as material shortage, cracks and the like, the length error of the forge piece is less than 0.5mm, and the length of the forge piece after thermal correction is 72 mm;
a sixth step: rapidly cooling the forge piece after thermal correction in an air cooling mode, wherein air cooling is firstly carried out to below 500 ℃, and then natural cooling is carried out to room temperature;
step 3, carrying out heat treatment quenching and tempering on the forged blank, wherein the hardness is 26-32 HRC, the tensile strength is more than or equal to 600MPa, the yield strength is more than or equal to 355MPa, and the elongation after fracture is more than or equal to 16%;
step 4, performing shot blasting treatment on the heat-treated and tempered forge piece, wherein shot blasting media are steel shots S170, shot blasting time is 18min, and the surface of the forge piece after shot blasting is bright and free of rust spots, oxide skin and dirt;
step 5, machining the forged piece by using a numerical control machine, wherein after machining, the length of the forged piece is 67mm, the inner diameter of the forged piece is 45mm, the outer diameter of the end, without the protrusion, of the pipe orifice is 54.15mm, and the inner diameter of the end is 38 mm;
step 6, carrying out magnetic powder inspection on the machined product by using a magnetic powder inspection machine, wherein the concentration ratio of magnetic suspension for magnetic powder inspection is as follows: 0.1-0.4 mL/100mL, the surface intensity of a fluorescent lamp irradiance workpiece is more than or equal to 1000 muW/cm 2, the white light intensity is less than or equal to 20LX, and the magnetic traces in all directions can be clearly displayed when an A-type test piece is tested; the magnetic powder flaw detection product has no obvious crack defect through visual inspection, and the residual magnetic strength of the product is less than or equal to 3 Gauss;
and 7, inspecting and preventing rust of the product to obtain a finished product.
Example 2
step 2, forging and pressing the blank:
a first step: heating the blank to 1000 ℃ by using an intermediate frequency furnace;
a second step: rapidly removing oxide skin by adopting high-pressure water;
a third step: forging and forming by using an electric friction press to obtain a forged piece, wherein the forged piece has no material shortage and no crack as shown in figure 3;
a fourth step: carrying out thermal correction on the forged piece after forging and forming by using an oil press; the temperature is not lower than 800 ℃, the forge piece after thermal correction has no defects such as material shortage, cracks and the like, the length error of the forge piece is less than 1mm, and the length of the forge piece after thermal correction is 314 mm;
a fifth step: rapidly cooling the forge piece after thermal correction in an air cooling mode, wherein air cooling is firstly carried out to below 500 ℃, and then natural cooling is carried out to room temperature;
step 3, performing thermal treatment tempering on the forged blank, wherein the hardness is 23-29.2 RHC, the tensile strength is more than or equal to 590MPa, the yield strength is more than or equal to 295MPa, and the elongation after fracture is more than or equal to 15%;
step 4, performing shot blasting treatment on the heat-treated and tempered forge piece, wherein shot blasting media are steel shots S170, shot blasting time is 18min, and the surface of the forge piece after shot blasting is bright and free of rust spots, oxide skin and dirt;
step 5, machining the forge piece by using a numerical control machine, wherein after machining, the length of the forge piece is 318mm, the outer diameter of a pipe orifice of a non-protruding end is 285 mm, the outer diameter of one end of the pipe orifice protruding outwards is 360mm, the inner diameter is 193mm, and the protruding width is 45 mm;
step 6, performing magnetic powder inspection on the product by using a magnetic powder inspection machine, wherein the concentration ratio of magnetic suspension for magnetic powder inspection is as follows: 0.1-0.4 mL/100mL, the surface intensity of a fluorescent lamp irradiance workpiece is more than or equal to 1000 muW/cm 2, the white light intensity is less than or equal to 20LX, and the magnetic traces of the A-type test piece in all directions can be clearly displayed; the magnetic powder flaw detection product has no obvious crack defect through visual inspection, and the residual magnetic strength of the product is less than or equal to 3 Gauss;
and 7, inspecting and preventing rust of the product to obtain a finished product.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The processing method of the hollow sleeve type part is characterized by comprising the following steps:
step 1, blanking: preparing a forging blank with a certain length from the hollow pipe material by a band sawing machine;
step 2, forging and pressing the blank:
a first step: heating the blank to 950-1050 ℃ by using an intermediate frequency furnace;
a second step: rapidly removing oxide skin by adopting high-pressure water;
a third step: forging and forming by using an electric screw press to obtain a forged piece;
a fourth step: carrying out thermal correction on the forged piece after forging and pressing;
a fifth step: rapidly cooling the forge piece after thermal correction in an air cooling mode;
step 3, performing thermal treatment quenching and tempering on the forged blank;
step 4, performing shot blasting treatment on the forged piece subjected to thermal treatment tempering;
step 5, machining the forge piece by using a numerical control machine;
step 6, performing magnetic particle inspection on the machined product by using a magnetic particle inspection machine;
and 7, inspecting and preventing rust of the product to obtain a finished product.
2. The method for processing the hollow sleeve part according to claim 1, wherein in the step 2, the blank is pressed by a punch press after being heated, so that the blank is formed.
3. The method of claim 2, wherein the thermal correction temperature is not less than 800 ℃.
4. The method for processing the hollow sleeve part according to claim 3, wherein the forged piece after thermal correction has no material shortage and cracks, and the length error of the forged piece is less than 0.5 mm.
5. The machining method of the hollow sleeve part as claimed in claim 4, wherein the rapid cooling is specifically as follows: firstly, the temperature is reduced to below 500 ℃ by adopting an air cooling mode, and then the temperature is naturally cooled to the room temperature.
6. The processing method of the hollow sleeve part according to claim 5, wherein the quenching and tempering hardness of the forging in the step 3 is 23-32 HRC, the tensile strength is greater than or equal to 590MPa, the yield strength is greater than or equal to 295MPa, and the elongation after fracture is greater than or equal to 15%.
7. The processing method of the hollow sleeve part according to claim 6, wherein in the step 4, the shot blasting medium is steel shot S170, and the shot blasting time is 12 min.
8. The method for processing the hollow sleeve part according to claim 7, wherein the magnetic suspension concentration ratio of the magnetic powder inspection is as follows: 0.1-0.4 mL/100mL, and the surface strength of the workpiece with fluorescent lamp irradiance is more than or equal to 1000 muW/cm2The intensity of the white light intensity is less than or equal to 20LX, and the magnetic traces in all directions can be clearly displayed when the A-type test piece is used for testing; the products inspected by visual inspection have no obvious crack defects, and the remanence is less than or equal to 3 gauss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716622.XA CN111805184A (en) | 2020-07-23 | 2020-07-23 | Method for processing hollow sleeve type part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716622.XA CN111805184A (en) | 2020-07-23 | 2020-07-23 | Method for processing hollow sleeve type part |
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| CN111805184A true CN111805184A (en) | 2020-10-23 |
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| CN202010716622.XA Pending CN111805184A (en) | 2020-07-23 | 2020-07-23 | Method for processing hollow sleeve type part |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399611A (en) * | 2021-06-15 | 2021-09-17 | 许昌中兴锻造有限公司 | Friction press-based spline hub forging process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5730812A (en) * | 1997-05-19 | 1998-03-24 | D-M-E Company | Method of manufacturing ejector pin sleeves |
| DE19903360A1 (en) * | 1998-03-20 | 1999-09-23 | Metalart Corp | Coupling hub flange making process |
| CN101559555A (en) * | 2009-05-19 | 2009-10-21 | 重庆长征重工有限责任公司 | Forging method of coupler knuckle for railway vehicle |
| CN102476259A (en) * | 2010-11-22 | 2012-05-30 | 贵州顺峰汽车零部件制造有限公司 | Manufacturing technology for half-axis sleeve tube |
| CN103161817A (en) * | 2013-04-07 | 2013-06-19 | 唐山德泰机械制造有限公司 | Hollow axle for high-speed locomotive and method for manufacturing hollow axle |
-
2020
- 2020-07-23 CN CN202010716622.XA patent/CN111805184A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5730812A (en) * | 1997-05-19 | 1998-03-24 | D-M-E Company | Method of manufacturing ejector pin sleeves |
| DE19903360A1 (en) * | 1998-03-20 | 1999-09-23 | Metalart Corp | Coupling hub flange making process |
| CN101559555A (en) * | 2009-05-19 | 2009-10-21 | 重庆长征重工有限责任公司 | Forging method of coupler knuckle for railway vehicle |
| CN102476259A (en) * | 2010-11-22 | 2012-05-30 | 贵州顺峰汽车零部件制造有限公司 | Manufacturing technology for half-axis sleeve tube |
| CN103161817A (en) * | 2013-04-07 | 2013-06-19 | 唐山德泰机械制造有限公司 | Hollow axle for high-speed locomotive and method for manufacturing hollow axle |
Non-Patent Citations (1)
| Title |
|---|
| 汤礼广: "《材料成型技术基础》", 31 August 2016 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113399611A (en) * | 2021-06-15 | 2021-09-17 | 许昌中兴锻造有限公司 | Friction press-based spline hub forging process |
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Application publication date: 20201023 |
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