CN112658611B - Method for machining small hole drill sleeve - Google Patents
Method for machining small hole drill sleeve Download PDFInfo
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- CN112658611B CN112658611B CN202011495692.3A CN202011495692A CN112658611B CN 112658611 B CN112658611 B CN 112658611B CN 202011495692 A CN202011495692 A CN 202011495692A CN 112658611 B CN112658611 B CN 112658611B
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- 238000003754 machining Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005520 cutting process Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000010892 electric spark Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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Abstract
The invention provides a method for processing a small hole drill sleeve, which comprises the following steps: step one, processing the outer diameter phi D1 and the inner diameter phi D1 of a workpiece, and reserving a clamping step for a process at the end part of the workpiece; step two, grinding the outer diameter phi D1 of the workpiece and the outer diameter phi D2 of the machining clamping step; step three, installing a positioning tool plate on the slow-speed wire-moving machine tool, and processing the inner diameter phi D3 of the positioning hole according to the actually measured outer diameter phi D1 of the tool; putting the workpiece into a positioning tool hole, and processing and grinding the inner diameter phi d1 of the workpiece; and step five, cutting off the clamping step for the process, blunting the sharp edge and rounding the orifice. The method has the advantages of simple operation, strong operability, low processing cost and high processing efficiency; the precision such as conicity, cylindricity, roughness, the straightness that hangs down of section and central line, the axiality of guiding hole and drill bushing excircle of drill bushing guiding hole has been improved, prevents the drill bit wearing and tearing, has avoided the fracture in the drill bit use.
Description
Technical Field
The invention relates to the technical field of drill bushing processing, in particular to a method for processing a small-hole drill bushing.
Background
The main functions of the drill sleeve are to position the position of the cutter such as a drill bit, a reamer and the like and to guide the feeding direction of the cutter. The drill sleeve is internally provided with a guide hole, the diameter of the guide hole is determined according to parts needing to be processed, generally speaking, in order to reduce the abrasion of the drill bit and avoid the breakage of the drill bit, the precision requirements on the taper, the cylindricity, the roughness, the verticality between the section and the central line, the coaxiality between the guide hole and the excircle of the drill sleeve and the like of the guide hole of the drill sleeve are higher. When used for machining small holes, it is difficult to ensure these accuracies, and thus the precision of the machined small holes is poor and the drill bit is vulnerable. The existing method for processing the small holes comprises the following steps: (1) the outer circle of the drill bushing is finely processed, and after heat treatment, the guide hole is processed by electric spark or wire cutting with the ground outer circle as the reference. By adopting the mode, the taper after the electric spark machining is larger, the cylindricity is easy to be out of tolerance, the calibration difficulty of the reference excircle is large, and the coaxiality of the reference excircle and the guide hole is difficult to guarantee; when in use, the drill bit is easy to break and has a short service life. Errors are easily generated in the parallelism between the molybdenum wire subjected to linear cutting and the center line of the outer circle of the base line of the drill bushing, the reference outer circle is difficult to align, and the coaxiality and the taper errors are large; and the wire cutting operation is complicated, the sample piece needs to be processed firstly, the clamping direction is marked, after the coaxiality is detected outside the machine, the zero point of the wire cutting processing is corrected according to the detection data and the direction, and finally, the drill bushing product is processed. (2) Before heat treatment, semi-finish machining of a reference excircle and a guide hole is finished by one-time clamping machining; or firstly processing the excircle, and finishing the semi-finishing of the guide hole by using a drilling, expanding and reaming processing method by taking the excircle as a reference; and after vacuum heat treatment, correcting and finishing the grinding finish machining of the reference excircle and finishing the finish machining of the guide hole by grinding. The method has the advantages that the processing difficulty of drilling, expanding and reaming is high, and the error of the cylindricity of the guide hole and the coaxiality of the guide hole and a reference excircle is large; in addition, certain deformation exists after heat treatment, so that the error of cylindricity and coaxiality is further increased; the polishing process cannot eliminate the aforementioned error, and the error is even further increased.
Chinese patent publication No. CN108480674A discloses a method for machining fine holes, which comprises the steps of machining the parts except for small holes, machining large holes on the upper parts of the small holes, designing a drill sleeve according to the size of the large holes, and inserting a pneumatic drill into the drill sleeve to machine the small holes. The method can not finish the processing of the small-hole drill bushing, and a measure for ensuring the processing precision of the drill bushing is not provided.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for machining a small hole drill sleeve.
The invention is realized by the following technical scheme.
The invention provides a method for processing a small hole drill sleeve, which comprises the following steps:
firstly, performing semi-finishing, namely starting to process a bar stock, processing the outer diameter phi D1 of a workpiece and the inner diameter phi D1 of the workpiece, reserving a clamping step for a process at the end part of the workpiece, and processing the outer diameter phi D2 of the clamping step and the inner diameter phi D2 of the clamping step, wherein the inner diameter phi D2 of the clamping step needs to be more than 1mm larger than the inner diameter phi D of a guide hole of a drill bushing to be processed;
performing outer circle finish machining, performing vacuum heat treatment on the workpiece requiring heat treatment after the previous step is completed, and then grinding and machining the outer diameter phi D1 of the workpiece and the outer diameter phi D2 of a clamping step by using a high-precision outer circle, wherein the coaxiality of the clamping step outer diameter phi D2 relative to the outer diameter phi D1 of the workpiece is controlled within 0.01 mm;
step three, clamping the positioning tooling plate, mounting the positioning tooling plate on a slow-speed wire-feeding machine tool, and cutting and machining the inner diameter phi D3 of a positioning hole on the positioning tooling plate according to the actual measurement result of the outer diameter phi D1 of the workpiece processed in the step two, so as to ensure that the gap is between 0.003 and 0.005mm after the workpiece is placed;
step four, finish machining the inner diameter, namely putting the workpiece into a positioning tool hole, tightly sucking the workpiece by using a magnet, machining the inner diameter phi d1 of the workpiece on the premise of not adjusting a machine tool and a positioning tool plate and not changing the machining zero point of a machining positioning hole, reserving the allowance of the inner diameter phi d1 of the workpiece relative to the inner diameter of a guide hole to be machined to be 0.002-0.004mm, then clamping a clamping step, grinding the inner diameter phi d1 of the workpiece, and obtaining the drill bushing guide hole after grinding;
and fifthly, removing the clamping step, clamping the excircle of the workpiece and correcting, cutting off the clamping step for the process by using fast wire cutting, blunting the sharp edge of the workpiece, and rounding the orifice of the guide hole.
In the first step, semi-finishing is carried out, and single-side allowance of 0.2-0.3mm is reserved for the inner diameter phi D1 of the workpiece, the outer diameter phi D1 of the workpiece, the inner diameter phi D2 of a clamping step and the outer diameter phi D2 of the clamping step.
And step two, grinding and machining the outer diameter phi D1 of the workpiece and the outer diameter phi D2 of the machining clamping step by using the high-precision outer circle, controlling the cylindricity of the outer diameter phi D1 of the workpiece to be within 0.006mm, and controlling the dimension error of the outer diameter phi D1 of the workpiece relative to the outer diameter phi D of the drill bushing to be machined to be within 0.004 mm.
And step three, cutting the positioning hole with the inner diameter phi d3 by multiple feed when cutting the positioning hole on the positioning tooling plate.
And step four, when the inner diameter phi d1 of the workpiece is machined, multiple-feed cutting is adopted.
The invention has the beneficial effects that:
by adopting the invention, the bar is processed, and the high-precision outer circle grinding, the slow wire-moving machine tool, the grinding and the fast wire-moving linear cutting can be completed, so that the method has the advantages of simple operation, difficult deviation in the clamping and positioning processes, clear control parameters, strong operability, low processing cost and high processing efficiency; the precision such as conicity, cylindricity, roughness, the straightness that hangs down of section and central line, the axiality of guiding hole and drill bushing excircle of drill bushing guiding hole has been improved, prevents the drill bit wearing and tearing, has avoided the fracture in the drill bit use.
Drawings
FIG. 1 is a schematic diagram of the construction of a drill sleeve machined according to the present invention;
FIG. 2 is a schematic structural diagram of a workpiece with a clamping step reserved after the workpiece is machined in the first step of the invention;
FIG. 3 is a schematic view of a positioning tooling plate used in the present invention;
fig. 4 is a schematic view of a structure in which a workpiece is placed on the positioning tool plate.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
The invention provides a method for processing a small hole drill sleeve, which comprises the following steps:
firstly, performing semi-finishing, namely starting to process a bar stock, processing the outer diameter phi D1 of a workpiece and the inner diameter phi D1 of the workpiece, reserving a clamping step for a process at the end part of the workpiece, and processing the outer diameter phi D2 of the clamping step and the inner diameter phi D2 of the clamping step, wherein the inner diameter phi D2 of the clamping step needs to be more than 1mm larger than the inner diameter phi D of a guide hole of a drill bushing to be processed;
performing outer circle finish machining, performing vacuum heat treatment on the workpiece requiring heat treatment after the previous step is completed, and then grinding and machining the outer diameter phi D1 of the workpiece and the outer diameter phi D2 of a clamping step by using a high-precision outer circle, wherein the coaxiality of the clamping step outer diameter phi D2 relative to the outer diameter phi D1 of the workpiece is controlled within 0.01 mm;
step three, clamping the positioning tooling plate, mounting the positioning tooling plate on a slow-speed wire-feeding machine tool, and cutting and machining the inner diameter phi D3 of a positioning hole on the positioning tooling plate according to the actual measurement result of the outer diameter phi D1 of the workpiece processed in the step two, so as to ensure that the gap is between 0.003 and 0.005mm after the workpiece is placed;
step four, finish machining the inner diameter, namely putting the workpiece into a positioning tool hole, tightly sucking the workpiece by using a magnet, machining the inner diameter phi d1 of the workpiece on the premise of not adjusting a machine tool and a positioning tool plate and not changing the machining zero point of a machining positioning hole, reserving the allowance of the inner diameter phi d1 of the workpiece relative to the inner diameter of a guide hole to be machined to be 0.002-0.004mm, then clamping a clamping step, grinding the inner diameter phi d1 of the workpiece, and obtaining the drill bushing guide hole after grinding;
and fifthly, removing the clamping step, clamping the excircle of the workpiece and correcting, cutting off the clamping step for the process by using fast wire cutting, blunting the sharp edge of the workpiece, and rounding the orifice of the guide hole.
In the method, the coaxiality of the clamping step in the second step and the outer diameter of the workpiece is controlled within 0.01mm, so that a uniform reference is adopted when the outer circle and the inner diameter of the workpiece are subsequently processed, and the accumulated error is reduced; and step three to step four, the positioning tooling plate is adopted, and the gap between the inner diameter phi d3 of the positioning hole and the workpiece is controlled, so that the positioning is convenient, and the problem of inaccurate calibration of the reference excircle is solved.
By adopting the invention, the bar is processed, and the high-precision outer circle grinding, the slow wire-moving machine tool, the grinding and the fast wire-moving linear cutting can be completed, so that the method has the advantages of simple operation, difficult deviation in the clamping and positioning processes, clear control parameters, strong operability, low processing cost and high processing efficiency; the precision such as conicity, cylindricity, roughness, the straightness that hangs down of section and central line, the axiality of guiding hole and drill bushing excircle of drill bushing guiding hole has been improved, prevents the drill bit wearing and tearing, has avoided the fracture in the drill bit use.
In the first step, semi-finishing is carried out, and single-side allowance of 0.2-0.3mm is reserved for the inner diameter phi D1 of the workpiece, the outer diameter phi D1 of the workpiece, the inner diameter phi D2 of a clamping step and the outer diameter phi D2 of the clamping step. So as to improve the processing efficiency and reduce the cutting amount in the subsequent steps.
And step two, grinding and machining the outer diameter phi D1 of the workpiece and the outer diameter phi D2 of the machining clamping step by using the high-precision outer circle, controlling the cylindricity of the outer diameter phi D1 of the workpiece to be within 0.006mm, and controlling the dimension error of the outer diameter phi D1 of the workpiece relative to the outer diameter phi D of the drill bushing to be machined to be within 0.004 mm. The size error and the cylindricity of the workpiece outer diameter phi D1 are controlled in a key point, and the accumulated error of linear cutting clamping and positioning is reduced.
And step three, cutting the positioning hole with the inner diameter phi d3 by multiple feed when cutting the positioning hole on the positioning tooling plate. Effectively reduce the roughness value of processing hole, reduce mechanical vibration and diameter error.
And step four, when the inner diameter phi d1 of the workpiece is machined, multiple-feed cutting is adopted.
The invention can be used for processing the drill bushing with the inner diameter phi D of the guide hole of 1.5-4 mm and the outer diameter phi D of the drill bushing of 5-8 mm, and correspondingly, the outer diameter phi D2 of the clamping step is preferably 6-9 mm.
Claims (5)
1. A method for processing a small hole drill sleeve is characterized by comprising the following steps: the method comprises the steps of firstly, performing semi-finishing, namely starting to process a bar stock, processing the outer diameter phi D1 of a workpiece and the inner diameter phi D1 of the workpiece, reserving a clamping step for a process at the end part of the workpiece, and processing the outer diameter phi D2 of the clamping step and the inner diameter phi D2 of the clamping step, wherein the inner diameter phi D2 of the clamping step needs to be more than 1mm larger than the inner diameter phi D of a guide hole of a drill bushing to be processed;
step one, semi-finishing, wherein single-side allowance of 0.2-0.3mm is reserved for the inner diameter phi D1 of the workpiece, the outer diameter phi D1 of the workpiece, the inner diameter phi D2 of a clamping step and the outer diameter phi D2 of the clamping step;
performing outer circle finish machining, performing vacuum heat treatment on the workpiece requiring heat treatment after the previous step is completed, and then grinding and machining the outer diameter phi D1 of the workpiece and the outer diameter phi D2 of a clamping step by using a high-precision outer circle, wherein the coaxiality of the clamping step outer diameter phi D2 relative to the outer diameter phi D1 of the workpiece is controlled within 0.01 mm;
secondly, grinding and machining the outer diameter phi D1 of the workpiece and the outer diameter phi D2 of the machining clamping step by using a high-precision outer circle, controlling the cylindricity of the outer diameter phi D1 of the workpiece to be within 0.006mm, and controlling the size error of the outer diameter phi D1 of the workpiece relative to the outer diameter phi D of the drill bushing to be machined to be within 0.004 mm;
step three, clamping the positioning tooling plate, mounting the positioning tooling plate on a slow-speed wire-feeding machine tool, and cutting and machining the inner diameter phi D3 of a positioning hole on the positioning tooling plate according to the actual measurement result of the outer diameter phi D1 of the workpiece processed in the step two, so as to ensure that the gap is between 0.003 and 0.005mm after the workpiece is placed;
step four, finish machining the inner diameter, namely putting the workpiece into a positioning tool hole, tightly sucking the workpiece by using a magnet, machining the inner diameter phi d1 of the workpiece on the premise of not adjusting a machine tool and a positioning tool plate and not changing the machining zero point of a machining positioning hole, reserving the allowance of the inner diameter phi d1 of the workpiece relative to the inner diameter of a guide hole to be machined to be 0.002-0.004mm, then clamping a clamping step, grinding the inner diameter phi d1 of the workpiece, and obtaining the drill bushing guide hole after grinding;
and fifthly, removing the clamping step, clamping the excircle of the workpiece and correcting, cutting off the clamping step for the process by using fast wire cutting, blunting the sharp edge of the workpiece, and rounding the orifice of the guide hole.
2. The fine hole drill bushing machining method according to claim 1, characterized in that: and step three, cutting the positioning hole with the inner diameter phi d3 by multiple feed when cutting the positioning hole on the positioning tooling plate.
3. The fine hole drill bushing machining method according to claim 1, characterized in that: and step four, when the inner diameter phi d1 of the workpiece is machined, multiple-feed cutting is adopted.
4. The fine hole drill bushing machining method according to claim 1, characterized in that: the inner diameter phi D of the drill bushing guide hole to be processed is 1.5 mm-4 mm, and the outer diameter phi D of the drill bushing is 5 mm-8 mm.
5. The fine hole drill bushing machining method according to claim 1, characterized in that: the outer diameter phi D2 of the clamping step is 6-9 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011495692.3A CN112658611B (en) | 2020-12-17 | 2020-12-17 | Method for machining small hole drill sleeve |
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| CN202011495692.3A CN112658611B (en) | 2020-12-17 | 2020-12-17 | Method for machining small hole drill sleeve |
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| CN112658611A CN112658611A (en) | 2021-04-16 |
| CN112658611B true CN112658611B (en) | 2022-02-01 |
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| CN113829012B (en) * | 2021-09-29 | 2022-12-06 | 成都光明光电有限责任公司 | Glass discharge tube and method for producing the same |
| CN114102067B (en) * | 2021-12-02 | 2022-08-23 | 北京中航科电测控技术股份有限公司 | Special machining method for aviation thin-wall parts |
| CN114226779B (en) * | 2021-12-11 | 2024-01-23 | 贵州凯星液力传动机械有限公司 | Machining method for long suspension deep eccentric step small hole |
| CN114850796B (en) * | 2022-05-19 | 2023-05-05 | 成都飞机工业（集团）有限责任公司 | Method for reconfiguring high-precision hole of internal part |
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| CN202028987U (en) * | 2010-12-28 | 2011-11-09 | 盘起工业(大连)有限公司 | Fixture for processing square-shaped circular boss positioning female die |
| US20140202172A1 (en) * | 2013-01-22 | 2014-07-24 | Sunpower, Inc. | Cold Finger For Cryocoolers |
| CN104493300B (en) * | 2014-04-04 | 2018-02-02 | 新兴重工湖北三六一一机械有限公司 | A kind of device and method for removing hole inward flange burr |
| CN104801745A (en) * | 2015-04-08 | 2015-07-29 | 苏州市鑫渭阀门有限公司 | Valve cap drill jig drilling technology |
| CN205183870U (en) * | 2015-11-16 | 2016-04-27 | 奇瑞汽车股份有限公司 | Compound direction drill bushing |
| CN108098474B (en) * | 2017-12-18 | 2019-11-08 | 中国航发贵州黎阳航空动力有限公司 | A kind of processing method of fixture and eccentric drill bushing for the processing of eccentric drill bushing |
| CN208303970U (en) * | 2018-03-06 | 2019-01-01 | 中国航发哈尔滨东安发动机有限公司 | A kind of tiny hole machined drill bushing |
| CN110091127B (en) * | 2019-04-25 | 2022-01-18 | 上海航天精密机械研究所 | Integral precision machining method for thin-wall slender pipe fitting |
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Address after: 563000 Gaoping Electromechanical Industrial Park, Huichuan District, Zunyi City, Guizhou Province Patentee after: Guizhou Aerospace Kaixing Intelligent Transmission Co.,Ltd. Country or region after: China Address before: 563003 Gaoping electromechanical Industrial Park, Huichuan District, Zunyi City, Guizhou Province Patentee before: GUIZHOU WINSTAR HYDRAULIC TRANSMISSION MACHINERY Co.,Ltd. Country or region before: China |