CN115338599A - High-precision processing technology for concentricity of inner hole and excircle of thin-wall pipe fitting - Google Patents
High-precision processing technology for concentricity of inner hole and excircle of thin-wall pipe fitting Download PDFInfo
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- CN115338599A CN115338599A CN202210835381.XA CN202210835381A CN115338599A CN 115338599 A CN115338599 A CN 115338599A CN 202210835381 A CN202210835381 A CN 202210835381A CN 115338599 A CN115338599 A CN 115338599A
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- pipe fitting
- inner hole
- excircle
- machining
- sleeve
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- 238000005516 engineering process Methods 0.000 title claims abstract description 9
- 238000003754 machining Methods 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 11
- 230000035882 stress Effects 0.000 claims abstract description 10
- 230000032683 aging Effects 0.000 claims abstract description 9
- 210000000078 claw Anatomy 0.000 claims abstract description 9
- 238000005496 tempering Methods 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 abstract description 3
- 230000000171 quenching effect Effects 0.000 abstract description 3
- 238000007669 thermal treatment Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention discloses a high-precision processing technology for concentricity of an inner hole and an outer circle of a thin-wall pipe fitting. Carrying out thermal treatment quenching and tempering on the pipe material; roughly machining the pipe material on a lathe, and machining an outer circle and an inner hole; processing the pipe fitting in the processing center for pipe fitting shaping, and accurately processing the pipe fitting in place by taking the outer circle of the pipe fitting; finely machining the outer circle and the inner hole of the pipe fitting on a numerical control lathe; placing the pipe fitting into an aging furnace to release stress; placing the pipe fitting on a numerical control lathe to machine an inner hole, fixing the pipe fitting by adopting a covering claw, completely covering the outer surface of the pipe fitting by using a covering surface of the covering claw, and then machining the inner hole of the pipe fitting in place by using the numerical control lathe; inserting the excircle processing core rod into the inner hole of the pipe fitting, enabling the excircle processing core rod to be in contact with the inner hole wall of the pipe fitting at the modeling part of the pipe fitting and the tail end of the pipe fitting, enabling the rest part of the inner hole of the pipe fitting not to be in contact with the excircle processing core rod, clamping the excircle processing core rod by two tips for fixing, and processing the excircle of the pipe fitting in place by a numerical control lathe. The invention ensures the roundness and the concentricity of the inner hole of the excircle of the pipe fitting.
Description
The technical field is as follows:
the invention belongs to the technical field of thin-wall pipe fitting machining, and particularly relates to a high-precision machining process for concentricity of an inner hole and an outer circle of a thin-wall pipe fitting.
The background art comprises the following steps:
in the production and processing process of stainless steel thin-wall pipe fittings such as 20CR13, the pipe fittings are easy to be deformed by heat or clamping and extruding due to the thin wall thickness of the pipe fittings, so that the eccentric roundness is poor after the outer circle of an inner hole is processed, and the product quality is influenced.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The invention content is as follows:
the invention aims to provide a high-precision processing technology for concentricity of an inner hole and an outer circle of a thin-wall pipe fitting, thereby overcoming the defects in the prior art.
In order to achieve the purpose, the invention provides a high-precision processing technology for concentricity of an inner hole and an outer circle of a thin-wall pipe fitting, which comprises the following steps: (1) Performing heat treatment quenching and tempering on the pipe material, wherein the hardness of the quenched and tempered pipe material is 23-28HRC;
(2) Roughly machining the quenched and tempered pipe material on a lathe, machining the shape and the inner hole of the pipe fitting, and reserving the size of the excircle and the size of the inner hole for 1mm;
(3) Machining the pipe fitting in the machining center for shaping the rough machined pipe fitting, and machining the pipe fitting in place by taking the outer circle of the pipe fitting as the accuracy;
(4) Performing finish machining on the excircle and the inner hole of the pipe fitting on the numerical control lathe by using the pipe fitting with the machined pipe fitting shape, wherein the size of the excircle and the inner hole of the pipe fitting is reserved with a margin of 0.3mm;
(5) Placing the pipe fitting after finish machining into an aging furnace, immersing the pipe fitting in oil, aging, and releasing stress by the pipe fitting;
(6) The aged pipe fitting is placed on a numerical control lathe to process an inner hole, the pipe fitting is fixed by adopting a covering claw, the covering surface of the covering claw is enclosed into a complete circle, the outer surface of the pipe fitting is completely covered, and then the numerical control lathe processes the inner hole of the pipe fitting in place to ensure the concentricity of the inner hole of the pipe fitting;
(7) Inserting the excircle processing core rod into the inner hole of the pipe fitting, enabling the excircle processing core rod to be in contact with the inner hole wall of the pipe fitting at the modeling part of the pipe fitting and the tail end of the pipe fitting, enabling the rest part of the inner hole of the pipe fitting not to be in contact with the excircle processing core rod, clamping the excircle processing core rod by two tips for fixing, and processing the excircle of the pipe fitting in place by a numerical control lathe.
Preferably, in the technical scheme, in the step (5), after the pipe fitting is placed in an aging furnace and immersed in oil, the oil temperature is heated to 350-500 ℃ for 12-24h, and the pipe fitting releases stress, so that the outer circle of the inner hole of the pipe fitting is processed in place, and the non-concentric roundness difference of the outer circle of the inner hole cannot be caused by stress deformation.
Preferably, in the technical scheme, the excircle processing mandrel includes top apex portion, the fixed part, keep away the vacancy portion, the sleeve shaft portion, bottom apex portion, the axle sleeve, top apex portion is connected with the fixed part, the fixed part is connected with keeping away the vacancy portion, keep away the vacancy portion and be connected with the sleeve shaft portion, sleeve shaft portion links to each other with bottom apex portion, sleeve shaft portion external diameter is the same with the axle sleeve internal diameter, the axle sleeve suit is on the sleeve shaft portion, the external diameter and the pipe fitting hole aperture of fixed part and axle sleeve are the same, it is less than pipe fitting hole aperture to keep away the vacancy portion external diameter, top apex portion, be provided with the apex hole on the bottom apex portion, when the excircle processing mandrel fixed pipe fitting, numerical control lathe passes through top apex portion, the apex hole centre gripping excircle processing mandrel of bottom apex portion, the fixed part surface contacts with the interior pore wall contact at pipe fitting molding position, the axle sleeve surface contacts with the terminal interior pore wall of pipe fitting.
Preferably, in the technical scheme, when the excircle processing mandrel is processed, the shaft sleeve is processed firstly, the inner hole of the shaft sleeve is processed in place, the excircle of the shaft sleeve is processed to leave a margin, two tops of the excircle processing mandrel are clamped, the outer diameter of the fixed part is processed, the outer diameter of the fixed part is the same as the inner hole diameter of the pipe fitting, the outer diameter of the sleeve shaft is processed, the outer diameter of the sleeve shaft is the same as the inner hole diameter of the shaft sleeve, then the shaft sleeve is sleeved on the sleeve shaft part, the excircle of the shaft sleeve is processed in place, the concentricity of the excircle processing mandrel is ensured, and the concentricity of the excircle of the pipe fitting can be ensured when the excircle processing mandrel processes the outer circle of the pipe fitting.
Compared with the prior art, the invention has the following beneficial effects:
the pipe fitting is subjected to tempering and rough machining, allowance is reserved, stress is removed through aging, and the condition that the outer circle of an inner hole is not eccentric and poor in roundness due to stress deformation of the pipe fitting is guaranteed. The wrapping claws clamp and process the inner hole of the pipe fitting, so that the roundness and the concentricity of the inner hole processing of the pipe fitting are ensured. The excircle processing core rod has two apexes for processing the excircle of the pipe fitting, so that the roundness and the concentricity of the excircle processing of the pipe fitting are ensured. The concentricity error of the excircle of the inner hole of the pipe fitting is within 2 mu.
Description of the drawings:
FIG. 1 is a schematic view of a structure of a thin-walled tube fixed by a core rod for machining an excircle by a high-precision machining process for concentricity of an inner hole of the thin-walled tube;
the reference signs are: 1-upper tip part, 2-fixing part, 3-space avoiding part, 4-sleeve shaft part, 5-lower tip part, 6-sleeve and 7-pipe fitting.
The specific implementation mode is as follows:
the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in figure 1, a high-precision processing technology for concentricity of an inner hole and an outer circle of a thin-wall pipe fitting comprises the following steps: (1) Performing heat treatment quenching and tempering on the pipe material, wherein the hardness of the quenched and tempered pipe material is 23-28HRC;
(2) Roughly machining the quenched and tempered pipe material on a lathe, machining the shape and the inner hole of the pipe fitting, and reserving the size of the excircle and the size of the inner hole for 1mm;
(3) Machining the pipe fitting in the machining center for shaping the rough machined pipe fitting, and machining the pipe fitting in place by taking the outer circle of the pipe fitting as the accuracy;
(4) Finely machining the outer circle and the inner hole of the pipe fitting on a numerical control lathe by the pipe fitting with the machined pipe fitting shape, wherein the size of the outer circle and the size of the inner hole of the pipe fitting are reserved with the allowance of 0.3mm;
(5) Placing the pipe fitting after finish machining into an aging furnace, immersing the pipe fitting in oil, heating the oil to 350-500 ℃ for 12-24h, and releasing stress of the pipe fitting so that the excircle of the inner hole of the pipe fitting is processed in place and the eccentric roundness difference of the excircle of the inner hole cannot be caused by stress deformation;
(6) Placing the aged pipe fitting on a numerical control lathe to process an inner hole, fixing the pipe fitting by adopting a wrapping claw, enclosing a wrapping surface of the wrapping claw into a complete circle, completely wrapping the outer surface of the pipe fitting, and then processing the inner hole of the pipe fitting in place by the numerical control lathe to ensure the concentricity of the inner hole of the pipe fitting;
(7) Insert the pipe fitting hole with the excircle processing plug, the 4 external diameters of axle sleeve portion are the same with 6 internal diameters of axle sleeve, 6 suits of axle sleeve are on axle sleeve portion 4, the external diameter of fixed part 2 and axle sleeve 6 is the same with 7 hole apertures of pipe fitting, 3 external diameters of clearance portion are less than 7 hole apertures of pipe fitting, numerical control lathe passes through top apex portion 1, the apex hole centre gripping excircle processing plug of bottom apex portion 5, the 2 external surfaces of fixed part contact with the interior pore wall at 7 molding positions of pipe fitting, 6 external surfaces of axle sleeve contact with the interior pore wall contact at 7 terminal ends of pipe fitting, numerical control lathe targets in place to 7 excircle processing of pipe fitting.
During excircle processing plug adds man-hour, process axle sleeve 6 earlier, put 6 hole processing of axle sleeve in place, 6 excircle processing of axle sleeve leaves the surplus, with two top centre grippings of excircle processing plug, process 2 external diameters of fixed part, 2 external diameters of fixed part are the same with 7 hole apertures of pipe fitting, process axle sleeve portion 4, 4 external diameters of axle sleeve portion are the same with 6 hole apertures of axle sleeve, then 6 suits of axle sleeve portion are on axle sleeve portion 4, put in place 6 excircle processing of axle sleeve, guarantee the concentricity of excircle processing plug, also can guarantee the concentricity of pipe fitting excircle when 7 excircle of excircle processing plug processing pipe fitting of excircle like this.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (4)
1. The high-precision processing technology for the concentricity of the inner hole and the outer circle of the thin-wall pipe fitting is characterized in that: the method comprises the following steps: (1) Performing heat treatment tempering on the pipe material, wherein the hardness of the tempered pipe material is 23-28HRC;
(2) Roughly machining the quenched and tempered pipe material on a lathe, machining the shape and the inner hole of the pipe fitting, and reserving the size of the excircle and the size of the inner hole for 1mm;
(3) Machining the pipe fitting in the machining center for shaping the rough machined pipe fitting, and machining the pipe fitting in place by taking the outer circle of the pipe fitting as the accuracy;
(4) Finely machining the outer circle and the inner hole of the pipe fitting on a numerical control lathe by the pipe fitting with the machined pipe fitting shape, wherein the size of the outer circle and the size of the inner hole of the pipe fitting are reserved with the allowance of 0.3mm;
(5) Placing the pipe fitting after finish machining into an aging furnace, immersing the pipe fitting in oil, aging, and releasing stress by the pipe fitting;
(6) Placing the aged pipe fitting on a numerical control lathe to machine an inner hole, fixing the pipe fitting by adopting a covering claw, surrounding the covering surface of the covering claw into a complete circle, completely covering the outer surface of the pipe fitting, and then machining the inner hole of the pipe fitting in place by the numerical control lathe;
(7) Inserting the excircle processing core rod into the inner hole of the pipe fitting, enabling the excircle processing core rod to be in contact with the inner hole wall of the pipe fitting at the modeling part of the pipe fitting and the tail end of the pipe fitting, enabling the rest part of the inner hole of the pipe fitting not to be in contact with the excircle processing core rod, clamping the excircle processing core rod by two tips for fixing, and processing the excircle of the pipe fitting in place by a numerical control lathe.
2. The high-precision processing technology for the concentricity of the inner hole and the outer circle of the thin-wall pipe fitting according to claim 1 is characterized in that: in the step (5), after the pipe fitting is placed into an aging furnace and immersed in oil, the oil temperature is heated to 350-500 ℃ for 12-24h, and the stress of the pipe fitting is released.
3. The high-precision processing technology for the concentricity of the inner hole and the outer circle of the thin-wall pipe fitting according to claim 1 is characterized in that: the excircle processing plug includes top apex portion, the fixed part, keep away the vacancy portion, the sleeve shaft portion, bottom apex portion, the axle sleeve, top apex portion is connected with the fixed part, the fixed part is connected with keeping away the vacancy portion, keep away the vacancy portion and be connected with the sleeve shaft portion, the sleeve shaft portion links to each other with bottom apex portion, sleeve shaft portion external diameter is the same with the axle sleeve internal diameter, the axle sleeve suit is on the sleeve shaft portion, the external diameter and the pipe fitting hole aperture of fixed part and axle sleeve are the same, it is less than pipe fitting hole aperture to keep away the vacancy portion external diameter, top apex portion, be provided with the apex hole on the bottom apex portion, when the fixed pipe fitting of excircle processing plug, numerical control lathe passes through top apex portion, bottom apex hole centre gripping excircle processing plug of bottom apex portion, the fixed part surface contacts with the interior pore wall at pipe fitting molding position, the axle sleeve surface contacts with the terminal interior pore wall of pipe fitting.
4. The thin-wall pipe fitting inner hole outer circle concentricity high-precision machining process according to claim 3 is characterized in that: when an excircle processing mandrel is processed, a shaft sleeve is processed firstly, a shaft sleeve inner hole is processed in place, a margin is reserved for processing the excircle of the shaft sleeve, two tops of the excircle processing mandrel are clamped, the outer diameter of a fixing part is processed, the outer diameter of the fixing part is the same as the inner hole diameter of a pipe fitting, a sleeve shaft part is processed, the outer diameter of the sleeve shaft part is the same as the inner hole diameter of the shaft sleeve, then the shaft sleeve is sleeved on the sleeve shaft part, the excircle of the sleeve shaft is processed in place, and the concentricity of the excircle processing mandrel is guaranteed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210835381.XA CN115338599A (en) | 2022-07-15 | 2022-07-15 | High-precision processing technology for concentricity of inner hole and excircle of thin-wall pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210835381.XA CN115338599A (en) | 2022-07-15 | 2022-07-15 | High-precision processing technology for concentricity of inner hole and excircle of thin-wall pipe fitting |
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| CN115338599A true CN115338599A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210835381.XA Withdrawn CN115338599A (en) | 2022-07-15 | 2022-07-15 | High-precision processing technology for concentricity of inner hole and excircle of thin-wall pipe fitting |
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|---|---|---|---|---|
| JPH0283155A (en) * | 1988-09-17 | 1990-03-23 | Ngk Insulators Ltd | Working method for ceramics rotor |
| CN103028894A (en) * | 2011-09-29 | 2013-04-10 | 西安航空动力股份有限公司 | Processing method of aeroengine strengthening spray rod and positioning core rod |
| CN106002093A (en) * | 2016-06-08 | 2016-10-12 | 郑州煤矿机械集团股份有限公司 | Manufacturing method for cylinder barrels with control valve bases |
| CN106425290A (en) * | 2016-08-24 | 2017-02-22 | 浙江萧山金龟机械有限公司 | Preparation method for table press |
| CN108213874A (en) * | 2018-01-12 | 2018-06-29 | 中国航发哈尔滨东安发动机有限公司 | Titanium alloy hollow thin-wall long shaft part processing method |
| CN110026748A (en) * | 2019-05-24 | 2019-07-19 | 无锡亿锞精密机械有限公司 | Ultra-thin non-magnetic alloy steel inside and outside circle precise machining process |
| CN111702422A (en) * | 2020-06-30 | 2020-09-25 | 重庆红江机械有限责任公司 | Machining method of crosshead sliding sleeve |
| CN111872635A (en) * | 2020-07-21 | 2020-11-03 | 无锡市润和机械有限公司 | Ultra-length-diameter-ratio turbine shaft with blind holes and accurate butt joint processing method |
| CN112264765A (en) * | 2020-10-13 | 2021-01-26 | 三河建华高科有限责任公司 | Method for machining main roller of multi-wire cutting machine |
| CN114619210A (en) * | 2021-12-16 | 2022-06-14 | 山西北方机械制造有限责任公司 | Method for machining small-wall-thickness-difference deep blind hole barrel type part |
-
2022
- 2022-07-15 CN CN202210835381.XA patent/CN115338599A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0283155A (en) * | 1988-09-17 | 1990-03-23 | Ngk Insulators Ltd | Working method for ceramics rotor |
| CN103028894A (en) * | 2011-09-29 | 2013-04-10 | 西安航空动力股份有限公司 | Processing method of aeroengine strengthening spray rod and positioning core rod |
| CN106002093A (en) * | 2016-06-08 | 2016-10-12 | 郑州煤矿机械集团股份有限公司 | Manufacturing method for cylinder barrels with control valve bases |
| CN106425290A (en) * | 2016-08-24 | 2017-02-22 | 浙江萧山金龟机械有限公司 | Preparation method for table press |
| CN108213874A (en) * | 2018-01-12 | 2018-06-29 | 中国航发哈尔滨东安发动机有限公司 | Titanium alloy hollow thin-wall long shaft part processing method |
| CN110026748A (en) * | 2019-05-24 | 2019-07-19 | 无锡亿锞精密机械有限公司 | Ultra-thin non-magnetic alloy steel inside and outside circle precise machining process |
| CN111702422A (en) * | 2020-06-30 | 2020-09-25 | 重庆红江机械有限责任公司 | Machining method of crosshead sliding sleeve |
| CN111872635A (en) * | 2020-07-21 | 2020-11-03 | 无锡市润和机械有限公司 | Ultra-length-diameter-ratio turbine shaft with blind holes and accurate butt joint processing method |
| CN112264765A (en) * | 2020-10-13 | 2021-01-26 | 三河建华高科有限责任公司 | Method for machining main roller of multi-wire cutting machine |
| CN114619210A (en) * | 2021-12-16 | 2022-06-14 | 山西北方机械制造有限责任公司 | Method for machining small-wall-thickness-difference deep blind hole barrel type part |
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Application publication date: 20221115 |
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| WW01 | Invention patent application withdrawn after publication |