CN111266799A - High-precision valve hole machining method for valve body - Google Patents
High-precision valve hole machining method for valve body Download PDFInfo
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- CN111266799A CN111266799A CN202010155559.7A CN202010155559A CN111266799A CN 111266799 A CN111266799 A CN 111266799A CN 202010155559 A CN202010155559 A CN 202010155559A CN 111266799 A CN111266799 A CN 111266799A
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
- B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
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Abstract
The invention relates to the technical field of valve hole machining of a valve body blank, in particular to a high-precision valve hole machining method of a valve body, which is used for solving the problem that the machining precision of a valve hole of a valve body on a gearbox is not high enough in the prior art. The invention comprises the following steps: the method comprises the following steps: processing and forming six surfaces and an oil duct of the valve body blank; step two: reaming: correcting the probe, fixing coordinate points, programming a program, and then reaming a valve body blank on a four-axis vertical machining center machine tool, wherein the surface quality of a valve hole reaches Ra0.8 after reaming; step three: precisely reaming the non-continuous high-precision valve hole: and (3) checking and adjusting each tool face of the tool by using a precision reamer, wherein the radial runout of the tool face is not more than 0.0012, programming is carried out for boring, the surface quality of the valve hole after boring reaches Ra0.4, the aperture size precision reaches 6 levels, and the cylindricity of the valve hole reaches 0.003-0.005. Through the technical scheme, the precision of the valve hole can be greatly improved, so that the performance of the gearbox can be improved.
Description
Technical Field
The invention relates to the technical field of valve hole machining of valve body blanks, in particular to a high-precision valve hole machining method of a valve body.
Background
A valve body blank on a general gearbox is used for high-low gear conversion, when the speed of a vehicle reaches the speed of a certain gear, hydraulic oil pushes the valve body blank to automatically convert the gear to the gear, and the safety and the reliability of vehicle running can be greatly improved. The valve hole is the heart of the valve body blank, the machining precision of the valve hole represents the performance and the service life of the valve body blank and determines the gear shifting quality of a vehicle, and therefore the high-precision machining of the valve hole represents the production capacity of an enterprise.
However, in the prior art, the valve hole precision of the upper valve body blank of the gearbox still needs to be improved. Therefore, a machining method capable of improving the precision of the valve hole is urgently needed so as to improve the performance of the gearbox.
Disclosure of Invention
Based on the problems, the invention provides a high-precision valve hole machining method for a valve body, which is used for solving the problem that the valve hole machining precision of the valve body on a gearbox is not high enough in the prior art. According to the invention, the valve hole is firstly reamed, the surface quality of the valve hole reaches Ra0.8 after reaming, then the valve hole is bored, the surface quality of the valve hole reaches Ra0.4 after boring, the aperture size precision reaches 6 levels, and the cylindricity of the valve hole reaches 0.003-0.005, so that the precision of the valve hole can be greatly improved, and the performance of the gearbox can be improved.
The invention specifically adopts the following technical scheme for realizing the purpose:
a high-precision valve hole machining method for a valve body comprises the following steps:
the method comprises the following steps: processing and forming six surfaces and an oil duct of the valve body blank;
step two: reaming: correcting the probe, fixing coordinate points, programming a program, and then reaming a valve body blank on a four-axis vertical machining center machine tool, wherein the surface quality of a valve hole reaches Ra0.8 after reaming;
step three: precisely reaming the non-continuous high-precision valve hole: and (3) checking and adjusting each tool face of the tool by using a precision reamer, wherein the radial runout of the tool face is not more than 0.0012, programming is carried out for boring, the surface quality of the valve hole after boring reaches Ra0.4, the aperture size precision reaches 6 levels, and the cylindricity of the valve hole reaches 0.003-0.005.
Preferably, after the hole is expanded in the second step, the diameter of the valve hole is left with a margin of 0.12-0.06 mm.
As a preferable mode, the hole expanding process in the second step includes the steps of:
step 1: and (3) correcting by using a positioning probe, finding out a valve hole central coordinate point, programming, and moving the center of the cutter to the valve hole central coordinate position:
step 2: and (3) reaming by using a hard alloy milling cutter with an internal cooling hole, wherein internal cooling and external cooling are simultaneously carried out during reaming, the load current display of a machine tool is focused during processing, and after the reaming action is finished, the surface quality of the valve hole reaches Ra0.8.
In a preferred embodiment, the pressure of the internal cooling in step 2 is 5Mbar or more and the pressure of the external cooling is 2Mbar or more.
As a preferable mode, the main shaft rotation speed S of the four-axis vertical machining center machine tool is: s is more than or equal to 1200 and less than or equal to 1500n/min, the feeding amount F is 0.1mm/n, and the load current is less than 15 percent.
In a preferred mode, the machining of the precision reaming discontinuous-surface high-precision valve hole in the third step comprises the following steps:
step (1): changing the reaming milling cutter into an adjustable boring cutter on a four-axis vertical machining center machine tool, and checking and adjusting each cutter surface of the boring cutter by using a dial indicator according to the requirement of the boring cutter;
step (2): and moving the center of the boring cutter to the central coordinate position of the valve hole for boring, wherein after boring is finished, the surface quality of the valve hole reaches Ra0.4, the dimensional accuracy of the valve hole reaches 6 levels, and the cylindricity of the valve hole reaches 0.003-0.005.
In a preferable mode, the front angle of the insert of the boring cutter in the step (1) is 12 degrees, and the runout of the cutter face of the boring cutter is not more than 0.0012.
As a preferable mode, the spindle rotation speed W of the four-axis vertical machining center machine tool in the step (2) is: w is more than or equal to 500n/min, and the feed rate R is as follows: r is less than or equal to 0.05 mm/n.
Preferably, in the step (2), the boring tool is flushed with a coolant under an internal cooling pressure of 5Mpa or more.
In a preferred embodiment, the coolant is an emulsion having a mineral oil concentration of not less than 55%, and the ratio of the emulsion to water is not less than 2: 8.
The invention has the following beneficial effects:
(1) according to the invention, the valve hole is firstly reamed, the surface quality of the valve hole reaches Ra0.8 after reaming, then the valve hole is bored, the surface quality of the valve hole reaches Ra0.4 after boring, the aperture size precision reaches 6 levels, and the cylindricity of the valve hole reaches 0.003-0.005, so that the precision of the valve hole can be greatly improved, and the performance of the gearbox can be improved.
(2) The invention adopts the way that the inner cooling and the outer cooling are simultaneously carried out during the hole expansion, and controls the pressure, thereby favorably eliminating the influence of cutting heat and chips on the valve hole and the cutter and reliably ensuring the quality of the hole. Meanwhile, the control of the reserved allowance plays a role in the favorable combination of the allowance and the matching property of a finish machining cutter, and is favorable for ensuring the product precision.
(3) When the precision reaming is carried out on the non-continuous-surface high-precision valve hole, the precision reamer is accurately adjusted, the radial runout of a cutter is not more than 0.0012, the inside and the outside are simultaneously cooled, the internal cooling pressure is not less than 5Mpa, chips are washed out from the inside to the outside, then external cooling liquid is pressurized to wash the cutter, the chips remained on the cutter are taken away by the external cooling liquid, meanwhile, the cutting liquid needs to be controlled, the rotating speed of a main shaft is controlled to be not less than 500n/min, the feeding amount is not more than 0.05mm/n, the load current of a machine tool is concerned to be displayed, the load current is less than 10%, and the precision of the valve hole is stably and effectively ensured through effective control of the cutter.
(4) The valve body blank valve hole processed by the processing method can stably and reliably ensure the surface quality Ra0.4, the aperture size precision is 6 grade, the cylindricity on the 110 mm hole length is more than 0.005 mm, the processed valve body blank has high precision and efficiency, the product quality is greatly improved, and strong force is injected into the development of enterprises.
(5) The cooling liquid is emulsion, the mineral oil concentration of the emulsion is not less than 55%, the mixing ratio of the emulsion and water is not less than 2: 8, and the cutter can be effectively cooled by correct preparation and use of the cooling liquid, so that the service life of the cutter can be prolonged.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic diagram of the right side view of the present invention;
FIG. 3 is a schematic left side view of the present invention;
FIG. 4 is a schematic cross-sectional view taken at A-A of FIG. 2 according to the present invention;
FIG. 5 is a schematic cross-sectional view taken at B-B of FIG. 4 according to the present invention;
FIG. 6 is a schematic cross-sectional view at C-C of FIG. 4 according to the present invention;
FIG. 7 is a schematic cross-sectional view taken at D-D of FIG. 4 in accordance with the present invention;
FIG. 8 is a schematic cross-sectional view taken at E-E of FIG. 4 in accordance with the present invention;
FIG. 9 is a schematic cross-sectional view at F-F of FIG. 4 according to the present invention;
reference numerals: 1 valve body blank, 2 valve holes.
Detailed Description
For a better understanding of the present invention by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and the following examples.
Example 1:
as shown in fig. 1 to 9, a high-precision valve hole machining method for a valve body comprises the following steps:
the method comprises the following steps: processing and forming six surfaces and an oil duct of the valve body blank 1;
step two: reaming: correcting the probe, fixing coordinate points, programming a program, and then reaming the valve body blank 1 on a four-axis vertical machining center machine tool, wherein the surface quality of the valve hole 2 reaches Ra0.8 after reaming;
step three: precisely reaming the non-continuous-surface high-precision valve hole 2: and (3) checking and adjusting each tool face of the tool by using a precision reamer, wherein the radial runout of the tool face is not more than 0.0012, programming is carried out for boring, the surface quality of the valve hole 2 after boring reaches Ra0.4, the aperture size precision reaches 6 levels, and the cylindricity of the valve hole 2 reaches 0.003-0.005.
Preferably, after the hole is expanded in the second step, the diameter of the valve hole 2 is left with a margin of 0.12-0.06 mm.
Preferably, the hole expanding process in the second step includes the following steps:
step 1: correcting by using a positioning probe, finding out a central coordinate point of the valve hole 2, programming, and moving the center of the cutter to the central coordinate position of the valve hole 2;
step 2: and (3) reaming by using a hard alloy milling cutter with an internal cooling hole, wherein internal cooling and external cooling are simultaneously carried out during reaming, the load current display of a machine tool is concerned during processing, and after the reaming action is finished, the surface quality of the valve hole 2 reaches Ra0.8.
Preferably, the pressure of the internal cooling in step 2 is 5Mbar or more and the pressure of the external cooling is 2Mbar or more.
Preferably, the main shaft rotating speed S of the four-shaft vertical machining center machine tool is as follows: s is more than or equal to 1200 and less than or equal to 1500n/min, the feeding amount F is 0.1mm/n, and the load current is less than 15 percent.
Preferably, the machining of the precision reaming discontinuous-surface high-precision valve hole 2 in the third step comprises the following steps:
step (1): changing the reaming milling cutter into an adjustable boring cutter on a four-axis vertical machining center machine tool, and checking and adjusting each cutter surface of the boring cutter by using a dial indicator according to the requirement of the boring cutter;
step (2): and moving the center of the boring cutter to the central coordinate position of the valve hole 2 for boring, wherein after boring is finished, the surface quality of the valve hole 2 reaches Ra0.4, the dimensional accuracy of the valve hole 2 reaches 6 levels, and the cylindricity of the valve hole 2 reaches 0.003-0.005.
Preferably, the front angle of the boring cutter in the step (1) is 12 degrees, and the runout of the cutter face of the boring cutter is not more than 0.0012.
Preferably, the main shaft rotating speed W of the four-shaft vertical machining center machine tool in the step (2) is as follows: w is more than or equal to 500n/min, and the feed rate R is as follows: r is less than or equal to 0.05 mm/n.
Preferably, the inner cooling pressure of the boring cutter during boring in the step (2) is more than or equal to 5MPa, and the boring cutter is flushed by cooling liquid.
Preferably, the cooling liquid is an emulsion, the mineral oil concentration of the emulsion is not less than 55%, and the mixing ratio of the emulsion and water is not less than 2: 8.
The working principle is as follows: the aluminum block is forged and thermally treated to prepare a valve body blank 1, six surfaces and an oil duct of the valve body blank 1 are processed and formed according to the figure, and then the high-precision valve hole 2 is processed. Firstly, hole expanding: the method comprises the steps of reaming a valve body blank 1 on a four-axis vertical machining center machine tool before finish machining forming, correcting by using a positioning probe before reaming, finding out a central coordinate point of a valve hole 2, programming (see a following machining procedure), moving the center of a cutter to the central coordinate position of the valve hole 2, reaming by using a hard alloy boring cutter with an internal cooling hole, simultaneously carrying out internal cooling and external cooling during reaming, displaying internal cooling pressure to be more than or equal to 5Mpa and feed quantity F to be 0.1mm/n by paying attention to load current of the machine tool, wherein the load current is less than 15%, after reaming, the surface quality of a hole is Ra0.8, and the diameter of the valve hole 2 is left with a margin of 0.12-0.06 mm.
The clamping is not loosened after the reaming, and the precise reaming of the non-continuous high-precision valve hole 2 is still carried out on a four-shaft vertical machining center machine tool: replacing a reaming and boring cutter with a precision reamer, wherein the reamer has a bottom surface and side surface porous internal cooling function, the front angle of a blade is 12 degrees, each cutter surface of the cutter is checked and adjusted by a dial indicator according to the requirement of the cutter, the runout of each cutter surface is not more than 0.0012, then programming is carried out (see a following processing procedure), the center of the cutter is moved to a hole center coordinate position for boring, the internal cooling pressure of the cutter is not less than 5Mpa during boring, cutting scraps are flushed from inside to outside, external cooling liquid is pressurized to flush the cutter, the cutting scraps remained on the cutter are taken away by using the external cooling liquid, meanwhile, the concentration of the cooling liquid needs to be controlled, the cooling liquid is emulsion cutting liquid, the mineral oil concentration of the original emulsion cutting liquid is not less than 55%, and the mixing ratio of; at this time, the main shaft rotating speed W of the four-shaft vertical machining center machine tool is as follows: w is more than or equal to 500n/min, and the feed rate R is as follows: r is less than or equal to 0.05mm/n, and the load current of a machine tool is shown, the load current is less than 10%, the surface quality Ra0.4 of the hole, the aperture size precision is 6-grade, the cylindricity of the valve hole 2 reaches 0.003-0.005, and the cylindricity of the 110 mm hole length is more than 0.005 mm.
The following processing procedures are valve hole reaming and finish reaming:
T05 M06(Tool Name＝Bore D＝d-(0.12～0.06)R＝0.00)
T06
G0 G90 G55 X37 Y0 A0
G43 H05 Z10 S1200 M3
M07 M08
G98 G76 X37 Y0 Z-111 R3 Q0.1 F120
X77 Y0 Z-85
X157 Y0 Z-60
X197 Y0 Z-49
G80
M05 M09
G91 G28 Z0
T06 M06(Tool Name＝Reamer D＝d R＝0.00)
T07
G0 G90 G55 X-43.5 Y0 A0
G43 H06 Z10 S800 M3
M07 M08
G98 G76 X37 YO Z-111 R3 Q0.0 F40
X77 YO Z-85
X157 Y0 Z-60
X197 Y0 Z-49
G80
M05 M09
G91 G28 Z0。
example 2:
on the basis of the above embodiment, the present embodiment provides a processing procedure of reaming and fine reaming when the valve hole is phi 16:
T05 M06(Tool Name＝Bore D＝15.90 R＝0.00)
T06
G0 G90 G55 X37 Y0 A0
G43 H05 Z10 S1200 M3
M07 M08
G98 G76 X37 Y0 Z-111 R3 Q0.1 F120
X77 Y0 Z-85
X157 Y0 Z-60
X197 Y0 Z-49
G80
M05 M09
G91 G28 Z0
T06 M06(Tool Name＝Reamer D＝16.00 R＝0.00)
T07
G0 G90 G55 X-43.5 Y0 A0
G43 H06 Z10 S800 M3
M07 M08
G98 G76 X37 Y0 Z-111 R3 Q0.0 F40
X77 Y0 Z-85
X157 Y0 Z-60
X197 YO Z-49
G80
M05 M09
G91 G28 Z0。
the rest is the same as example 1, and therefore, will not be described herein.
The above is an embodiment of the present invention. The embodiments and specific parameters in the embodiments are only for the purpose of clearly showing the verification process of the invention, and are not used to limit the scope of the invention, which is defined by the claims, and all the equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be included in the scope of the invention.
Claims (10)
1. A high-precision valve hole machining method of a valve body is characterized by comprising the following steps:
the method comprises the following steps: processing and forming six surfaces and an oil duct of the valve body blank (1);
step two: reaming: correcting the probe, fixing coordinate points, programming a program, and then reaming the valve body blank (1) on a four-axis vertical machining center machine tool, wherein the surface quality of the valve hole (2) reaches Ra0.8 after reaming;
step three: precisely reaming the non-continuous-surface high-precision valve hole (2): and (3) checking and adjusting each tool face of the tool by using a precision reamer, wherein the radial runout of the tool face is not more than 0.0012, programming is carried out for boring, the surface quality of the valve hole (2) after boring reaches Ra0.4, the aperture size precision reaches 6 levels, and the cylindricity of the valve hole (2) reaches 0.003-0.005.
2. The high-precision valve hole machining method of the valve body according to claim 1, characterized in that: and after reaming in the second step, the diameter of the valve hole (2) is left with a margin of 0.12-0.06 mm.
3. The high-precision valve hole machining method of the valve body according to claim 1, characterized in that: the reaming processing in the second step comprises the following steps:
step 1: correcting by using a positioning probe, finding out a central coordinate point of the valve hole (2), programming, and moving the center of the cutter to the central coordinate position of the valve hole (2);
step 2: and (3) reaming by using a hard alloy milling cutter with an internal cooling hole, wherein internal cooling and external cooling are simultaneously carried out during reaming, the load current display of a machine tool is concerned during processing, and after the reaming action is finished, the surface quality of the valve hole (2) reaches Ra0.8.
4. The high-precision valve hole machining method of the valve body according to claim 3, characterized in that: in the step 2, the internal cooling pressure is more than or equal to 5Mbar, and the external cooling pressure is more than or equal to 2 Mbar.
5. The high-precision valve hole machining method of the valve body according to claim 3, characterized in that: the main shaft rotating speed S of the four-shaft vertical machining center machine tool is as follows: s is more than or equal to 1200 and less than or equal to 1500n/min, the feeding amount F is 0.1mm/n, and the load current is less than 15 percent.
6. The high-precision valve hole machining method of the valve body according to claim 1, characterized in that: the machining of the precise reaming non-continuous-surface high-precision valve hole (2) comprises the following steps:
step (1): changing the reaming milling cutter into an adjustable boring cutter on a four-axis vertical machining center machine tool, and checking and adjusting each cutter surface of the boring cutter by using a dial indicator according to the requirement of the boring cutter;
step (2): and moving the center of the boring cutter to the central coordinate position of the valve hole (2) for boring, wherein after boring is finished, the surface quality of the valve hole (2) reaches Ra0.4, the dimensional precision of the valve hole (2) reaches 6 levels, and the cylindricity of the valve hole (2) reaches 0.003-0.005.
7. The high-precision valve hole machining method of the valve body according to claim 6, characterized in that: the front angle of the blade of the boring cutter in the step (1) is 12 degrees, and the runout of the cutter surface of the boring cutter is not more than 0.0012.
8. The high-precision valve hole machining method of the valve body according to claim 6, characterized in that: the main shaft rotating speed W of the four-shaft vertical machining center machine tool in the step (2) is as follows: w is more than or equal to 500n/min, and the feed rate R is as follows: r is less than or equal to 0.05 mm/n.
9. The high-precision valve hole machining method of the valve body according to claim 6, characterized in that: and (3) during boring in the step (2), the internal cooling pressure of the boring cutter is more than or equal to 5Mpa, and the boring cutter is flushed by cooling liquid.
10. The high-precision valve hole machining method of the valve body according to claim 9, characterized in that: the cooling liquid is an emulsion, the mineral oil concentration of the emulsion is not less than 55%, and the mixing ratio of the emulsion to water is not less than 2: 8.
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| CN109227047A (en) * | 2018-10-19 | 2019-01-18 | 新乡市恒德机电有限公司 | A kind of hydraulic valve deep hole processing technology |
| CN109531074A (en) * | 2018-12-29 | 2019-03-29 | 苏州莱易精密机电有限公司 | A kind of hydraulic pump valve body processing technology |
| CN208825735U (en) * | 2018-10-11 | 2019-05-07 | 东莞龙仕威精密工具有限公司 | The high-accuracy forming reamer of cold trap outside interior cold hole |
| CN110216431A (en) * | 2019-06-25 | 2019-09-10 | 哈尔滨汽轮机厂有限责任公司 | A kind of processing method of 1000MW Steam Turbine jiggering gear hole |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3991456A (en) * | 1972-04-10 | 1976-11-16 | Stanray Corporation | Method of forming valve bodies |
| JP2011088261A (en) * | 2009-10-26 | 2011-05-06 | Honda Motor Co Ltd | Tool and method for boring |
| WO2015075795A1 (en) * | 2013-11-21 | 2015-05-28 | 日鍛バルブ株式会社 | Method for manufacturing hollow poppet valve |
| CN104646959A (en) * | 2014-12-31 | 2015-05-27 | 域鑫科技（惠州）有限公司 | Method for machining inner hole of control valve |
| CN105522340A (en) * | 2015-11-12 | 2016-04-27 | 陕西一品达石化有限公司 | Main valve hole machining method for water press distributor valve body |
| GB2549422A (en) * | 2016-10-03 | 2017-10-18 | Singh Kanth Kuldip | An extruded shower valve |
| CN208825735U (en) * | 2018-10-11 | 2019-05-07 | 东莞龙仕威精密工具有限公司 | The high-accuracy forming reamer of cold trap outside interior cold hole |
| CN109227047A (en) * | 2018-10-19 | 2019-01-18 | 新乡市恒德机电有限公司 | A kind of hydraulic valve deep hole processing technology |
| CN109531074A (en) * | 2018-12-29 | 2019-03-29 | 苏州莱易精密机电有限公司 | A kind of hydraulic pump valve body processing technology |
| CN110216431A (en) * | 2019-06-25 | 2019-09-10 | 哈尔滨汽轮机厂有限责任公司 | A kind of processing method of 1000MW Steam Turbine jiggering gear hole |
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| CN111266799B (en) | 2022-01-07 |
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