CN109277645B - Broaching machining method for rectangular internal spline of titanium alloy thin-wall part - Google Patents
Broaching machining method for rectangular internal spline of titanium alloy thin-wall part Download PDFInfo
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- CN109277645B CN109277645B CN201811305560.2A CN201811305560A CN109277645B CN 109277645 B CN109277645 B CN 109277645B CN 201811305560 A CN201811305560 A CN 201811305560A CN 109277645 B CN109277645 B CN 109277645B
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- broaching
- broach
- titanium alloy
- internal spline
- alloy thin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F1/00—Making gear teeth by tools of which the profile matches the profile of the required surface
- B23F1/08—Making gear teeth by tools of which the profile matches the profile of the required surface by broaching; by broach-milling
- B23F1/086—Pot broaching
Abstract
The invention provides a broaching processing method of a rectangular internal spline of a titanium alloy thin-wall part, which comprises the steps of designing a broach meeting requirements; adjusting the support clamp and the state of the part before broaching; a step of increasing the oil temperature of the broaching machine to 35 to 40 ℃; and broaching the spline by using the broaching tool. The hoop is adopted to enhance the rigidity of the part, the problems that the part needs to be broached, the wall is thin and easy to deform are effectively solved, and the influence of the shrinkage deformation of the titanium alloy on the size of the internal spline is properly offset by properly increasing the width of the cutting edge of the broach.
Description
Technical Field
The invention belongs to the field of broaching of titanium alloy thin-wall parts of aircraft engines, and mainly relates to a broaching method for rectangular internal splines of titanium alloy thin-wall parts.
Background
Broaching refers to cutting off a very thin metal layer from a workpiece in sequence tooth by using a special broach to enable the surface to achieve higher dimensional accuracy and lower roughness, and the broaching is a high-efficiency material removing processing method. The method is suitable for mass production and processing of a large number of parts. The parts have different shapes and can be processed into round holes, square holes, polygonal holes, splines, dovetail grooves and other different shapes by adopting an internal broaching and external broaching mode. The broaching process is widely applied to the fields of automobiles, combustion engines, aviation, ships and warships and the like.
For parts needing broaching, the requirement on the dimensional accuracy of parts is extremely strict, but due to the limitations of the structure of the parts, the self performance of materials and the like, for example, the broaching area of the parts is thin-walled, the materials are titanium alloy, and the broaching deformation cannot meet the design requirement.
Disclosure of Invention
In order to solve the problems, the invention provides a broaching method for a rectangular internal spline of a titanium alloy thin-wall part, which comprises the following steps:
the method comprises the following steps: designing a broach meeting the requirement, wherein a front guide part of the broach is conical, the size of the front guide part is such that the clearance between the front guide part and a part prefabricated hole is 0.01mm, the width of a cutting edge of the broach is 0.006mm wider than a key of a spline, and the tooth lifting amount is controlled to be 0.01mm-0.02 mm;
step two: adjusting the state of the support clamp and the part before broaching to ensure that the parallelism of the support clamp and the surface of the broaching machine is less than or equal to 0.008 mm; ensuring that the perpendicularity between the broaching inner hole of the part and the supporting end surface of the part is less than or equal to 0.015 mm;
step three: increasing the temperature of the oil of the broaching machine to 35-40 ℃;
step four: and broaching the spline by the broaching tool, wherein the broaching speed is controlled to be 1.5-2.0 m/min.
Further, in the fourth step, the broaching speed is 1.8 m/min.
Further, before the fourth step, a hoop is added to the neck of the broaching area, and the clearance between the hoop and the outer circle of the part is controlled to be 0.01mm-0.03 mm.
Further, in the broaching process, the broaching tool is circumferentially and uniformly cooled.
Furthermore, an annular water pipe is radially arranged around the broach, and cooling water nozzles are uniformly arranged on the annular water pipe.
Further, the cooling water spraying angle is as follows: an angle of 40 degrees is formed between the axial direction of the broach, and the flow rate of cooling water is 60L/min.
And further, in the fourth step, broaching is carried out by adopting a numerical control double-cylinder vertical broaching machine.
The invention has the beneficial effects that:
the invention provides a special cutter, which aims to solve the problem that the broaching deformation cannot meet the design requirement in the prior art, and meanwhile, the rigidity of a part is enhanced by adopting a hoop, so that the problems that the part needs to be broached and has thin wall and easy deformation are effectively solved.
The invention also properly enlarges the cutting edge width of the broach, and properly counteracts the influence of the shrinkage deformation of the titanium alloy on the size of the internal spline.
Detailed Description
The design concept of the invention is as follows: aiming at the part of the titanium alloy thin-wall part for broaching the rectangular internal spline, the invention provides a special broaching process method for the titanium alloy thin wall, which effectively solves the influence of thin wall deformation and titanium alloy material shrinkage deformation, and ensures that the broaching machining meets the size requirement.
The respective steps are explained below.
The method comprises the following steps: the broach is designed to meet the requirements, the leading portion of the broach is tapered to guide the part. The clearance between the front guide part and the part prefabricated hole is 0.01 mm. The width of the cutting edge of the broach is 0.006mm wider than the width of the spline, and the tooth lifting amount is controlled to be 0.01mm-0.02 mm.
Step two: adjusting the support clamp of the part to be processed and the pre-broaching state of the part to ensure that the parallelism of the connection surface of the support clamp and the broaching machine is less than or equal to 0.008 mm; and ensuring that the perpendicularity between the broaching inner hole of the part and the supporting end surface of the part is less than or equal to 0.015 mm.
Step three: the broaching machine is started to run empty, and the temperature of the oil is increased to 35-40 ℃. At this temperature, the broaching force is relatively smooth.
Step four: and broaching the spline by the broaching tool, wherein the broaching speed is controlled to be 1.5-2.0 m/min. And broaching by adopting a numerical control double-cylinder vertical broaching machine. More specifically, an L5560 double-cylinder vertical broaching machine is adopted.
Preferably, the broaching speed is 1.8 m/min. When the broaching is carried out at the speed, the tool does not creep during operation, the surface quality of the machined part is optimal, and the roughness reaches below Ra0.8.
Preferably, before the fourth step, a hoop is added to the neck part of the broaching area, the clearance between the hoop and the outer circle of the part is controlled to be 0.01mm-0.03mm, and the shrinkage deformation of the part is controlled.
Preferably, the broach is cooled during broaching. During broaching, the annular cooling mode is adopted in the embodiment, namely, an annular cooling ring pipe is arranged around the broach shaft, and a plurality of cooling water spray holes are formed in the cooling ring pipe, so that water is sprayed to the broach and is uniformly cooled. The cooling ring pipe is provided with 48 cooling water holes. The injection angle is: an angle of 40 degrees is formed between the axial direction of the broach, and the cooling flow is 60L/min. The cooling liquid is sprayed along the cutter body under the angle of 40 degrees, so that the reverse splashing of the cooling liquid sprayed to the cutter is reduced, the cooling liquid flows along the axial direction of the cutter, and more heat is taken away.
Claims (4)
1. A broaching processing method for a rectangular internal spline of a titanium alloy thin-wall part is characterized by comprising the following steps:
the method comprises the following steps: designing a broach meeting the requirement, wherein a front guide part of the broach is conical, the size of the front guide part is such that the clearance between the front guide part and a part prefabricated hole is 0.01mm, the width of a cutting edge of the broach is 0.006mm wider than a key of a spline, and the tooth lifting amount is controlled to be 0.01mm-0.02 mm;
step two: adjusting the support clamp of the part to be processed and the pre-broaching state of the part to ensure that the parallelism of the connection surface of the support clamp and the broaching machine is less than or equal to 0.008 mm; ensuring that the perpendicularity between the broaching inner hole of the part and the supporting end surface of the part is less than or equal to 0.015 mm;
step three: increasing the temperature of the oil of the broaching machine to 35-40 ℃;
step four: broaching the spline by using a broaching tool, wherein the broaching speed is controlled to be 1.5-2.0 m/min;
in the broaching process, the broaching tool is uniformly cooled in the circumferential direction;
annular water pipes are radially arranged around the broach, and cooling water nozzles are uniformly arranged on the annular water pipes;
the cooling water injection angle is: forming an angle of 40 degrees with the axial direction of the broach; the flow rate of the cooling water was 60L/min.
2. The broaching method for the rectangular internal spline of the titanium alloy thin-walled part according to claim 1, wherein in the fourth step, the broaching speed is 1.8 m/min.
3. The method for broaching the rectangular internal spline of the titanium alloy thin-wall part according to claim 1, wherein before the fourth step, a hoop is added to the neck of the broaching area, and the clearance between the hoop and the outer circle of the part to be machined is controlled to be 0.01mm-0.03 mm.
4. The broaching method for the rectangular internal spline of the titanium alloy thin-wall part according to claim 1, wherein in the fourth step, a numerical control double-cylinder vertical broaching machine is adopted for broaching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811305560.2A CN109277645B (en) | 2018-11-05 | 2018-11-05 | Broaching machining method for rectangular internal spline of titanium alloy thin-wall part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811305560.2A CN109277645B (en) | 2018-11-05 | 2018-11-05 | Broaching machining method for rectangular internal spline of titanium alloy thin-wall part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109277645A CN109277645A (en) | 2019-01-29 |
| CN109277645B true CN109277645B (en) | 2020-04-10 |
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| CN201811305560.2A Active CN109277645B (en) | 2018-11-05 | 2018-11-05 | Broaching machining method for rectangular internal spline of titanium alloy thin-wall part |
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Citations (7)
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| CN102672259A (en) * | 2011-03-16 | 2012-09-19 | 新疆中收农牧机械公司 | Method for broaching ultra-deep inner hole of seat tube of cotton-picking head of cotton picker |
| CN202639923U (en) * | 2012-07-03 | 2013-01-02 | 山东上汽汽车变速器有限公司 | Thin-wall part broaching tool |
| CN103029076A (en) * | 2012-12-27 | 2013-04-10 | 哈尔滨东安发动机（集团）有限公司 | Hooping rounding tool for thin-walled part |
| CN203141348U (en) * | 2013-01-15 | 2013-08-21 | 哈尔滨东安发动机（集团）有限公司 | Multi-section hooping tool for thin-walled structural parts |
| CN103586648A (en) * | 2013-11-13 | 2014-02-19 | 南京金鑫传动设备有限公司 | Machining method for rectangular splines |
| CN108189903A (en) * | 2017-11-28 | 2018-06-22 | 江阴市永兴机械制造有限公司 | A kind of opening internal spline and its manufacturing method |
| CN108453306A (en) * | 2018-05-14 | 2018-08-28 | 江阴塞特精密工具有限公司 | A kind of broaching tool and Broaching Technology of quincunx splined hole |
-
2018
- 2018-11-05 CN CN201811305560.2A patent/CN109277645B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672259A (en) * | 2011-03-16 | 2012-09-19 | 新疆中收农牧机械公司 | Method for broaching ultra-deep inner hole of seat tube of cotton-picking head of cotton picker |
| CN202639923U (en) * | 2012-07-03 | 2013-01-02 | 山东上汽汽车变速器有限公司 | Thin-wall part broaching tool |
| CN103029076A (en) * | 2012-12-27 | 2013-04-10 | 哈尔滨东安发动机（集团）有限公司 | Hooping rounding tool for thin-walled part |
| CN103029076B (en) * | 2012-12-27 | 2016-09-28 | 哈尔滨东安发动机（集团）有限公司 | A kind of hoop sired results tool of thin-walled parts |
| CN203141348U (en) * | 2013-01-15 | 2013-08-21 | 哈尔滨东安发动机（集团）有限公司 | Multi-section hooping tool for thin-walled structural parts |
| CN103586648A (en) * | 2013-11-13 | 2014-02-19 | 南京金鑫传动设备有限公司 | Machining method for rectangular splines |
| CN103586648B (en) * | 2013-11-13 | 2016-02-03 | 南京金鑫传动设备有限公司 | A kind of processing method of rectangular spline |
| CN108189903A (en) * | 2017-11-28 | 2018-06-22 | 江阴市永兴机械制造有限公司 | A kind of opening internal spline and its manufacturing method |
| CN108453306A (en) * | 2018-05-14 | 2018-08-28 | 江阴塞特精密工具有限公司 | A kind of broaching tool and Broaching Technology of quincunx splined hole |
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| CN109277645A (en) | 2019-01-29 |
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