CN101323035A - Digital control continuous finishing method of large pitch ball screw nut - Google Patents
Digital control continuous finishing method of large pitch ball screw nut Download PDFInfo
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- CN101323035A CN101323035A CNA2008100224399A CN200810022439A CN101323035A CN 101323035 A CN101323035 A CN 101323035A CN A2008100224399 A CNA2008100224399 A CN A2008100224399A CN 200810022439 A CN200810022439 A CN 200810022439A CN 101323035 A CN101323035 A CN 101323035A
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- grinding
- raceway
- nut
- emery wheel
- ball nut
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Abstract
The invention discloses a numerical control continuous dressing method for grinding a large-lead ball nut and includes the following steps of feed preparation, rough raceway machining, heat treatment of the ball nut and the finish machining of raceway grinding machining of the large-lead ball nut,(1) obtaining a theoretical axial section shape of a grinding wheel according to a curved surface of a ball nut raceway; (2) obtaining a modified axial section shape curve of the grinding wheel according to the theoretical axial section shape of the grinding wheel; (3) modifying the grinding wheel; (4) performing the finish machining of raceway grinding of the large-lead ball nut by using the grinding wheel; the raceway grinding can be carried out for a plurality of times; the section shape of the raceway is recalculated after one grinding or a plurality of times of grinding, and the grinding wheel is redressed, and the ball nut raceway is reground and then the large-lead ball nut is obtained after a plurality of cycle times. The method which is high in grinding precision of the large-lead ball nut and simple in the axial section shape of the grinding wheel ensures the machining precision of the raceway and can be applied to the machining of the high-precision large-lead ball nut.
Description
Technical field
The present invention relates to a kind of big helical pitch nut processing technology, specifically a kind of nut rolling way that can guarantee cuts the digital control continuous finishing method of the large pitch ball screw nut of shape precision.
Background technology
Ball screw assembly, has characteristics such as positioning accuracy height, transmission efficiency height, synchronism are good, long service life, uses in fields such as Digit Control Machine Tool, precision instrument, high precision measuring instrument, automatic production lines and extensively.Ball nut determines its service performance to a great extent as the critical component of ball-screw auxiliary driving.Along with the widespread usage of the high speed development and the industry mechanical arm of automated control technology, the demand of great lead ball lead screw pair is increased day by day.
Large lead ball nuts is compared with common ball nut, have following characteristics: (1) helical pitch is big, the helical pitch of common ball nut is generally 4-20mm, and the ball nut of big helical pitch can reach 40mm in addition more than, adopt traditional processing technology that the ball nut raceway of big helical pitch is processed, the big and precision of difficulty can not guarantee.(2) the raceway lead angle is big, two kinds of lead screw pair of same diameter, and because of the helical pitch difference, its raceway lead angle may differ several times.(3) raceway required precision height, large lead ball nuts generally are used in industrial machinery on hand as precision drive.Accompanying drawing 1 has illustrated that big helical pitch nut can make mill bar and nut produce interference when adopting plain grinding technology.
It all is to adopt two circular arcs to be spliced that the normal direction of ball nut raceway is cut shape.Inner roller path of ball nut generally all be with grinding as its last one technology, therefore how to improve grinding accuracy, and it is simple to make grinding wheel spindle cut shape, become one of key technology of making ball screw assembly.The traditional diamond-making technique of ball-screw nut raceway grinding is to make the angle of emery wheel mill bar and nut axis equal the lead angle of nut, and nut rotates around himself axis, and emery wheel is done rectilinear motion along a straight line with the nut shaft line parallel.The straight-line speed of the rotating speed of nut and emery wheel meets certain proportion, and under both compound motions, grinding goes out the moulding raceway of nut.But along with the growing needs of high speed feed mechanism, the demand of great lead ball lead screw pair is also growing.The growth of ball screw assembly, helical pitch inevitably makes the also corresponding increase of lead angle of ball nut.Along with the increase of lead angle, when using conventional method processing nut, the end face of mill bar and nut may bump, and this directly has influence on length and the precision that can process nut.
Summary of the invention
In order accurately to process large lead ball nuts, the digital control continuous finishing method that the purpose of this invention is to provide a kind of large pitch ball screw nut, this method is to large pitch ball screw nut precision height, it is simple that grinding wheel spindle cuts shape, guarantee the machining accuracy of raceway, can be applicable to the processing of high accuracy large lead ball nuts.
The objective of the invention is to be achieved through the following technical solutions:
A kind of digital control continuous finishing method of large pitch ball screw nut is characterized in that: the angle of emery wheel mill bar and ball nut axis is carrying out grinding fine finishining to inner roller path of ball nut under the setting angle arbitrarily, and it may further comprise the steps:
1) gets the raw materials ready;
2) raceway roughing;
3) ball nut is heat-treated, guarantee hardness 〉=HRC58;
4) large lead ball nuts is ground raceway fine finishining, step is as follows:
1. obtain the theoretical axle section shape of emery wheel according to the nut rolling way curved surface;
2. cutting a shape according to the theoretical axle of emery wheel obtains revised grinding wheel spindle and cuts the shape curve;
3. emery wheel is revised;
4. adopt emery wheel that large lead ball nuts is ground raceway fine finishining; Grinding race carries out several times, every once or grinding several times just raceway is cut shape and recomputates, redress emery wheel, regrind and cut nut rolling way, obtain large lead ball nuts after the circulation for several times.
In the step 4) of the present invention, the design of grinding wheel profile sees the application for a patent for invention of patent name for " method for accurately designing of profile of ball nut grinding wheel with great lead " for details, and application number is 200610052489.2.Specifically: based on spiral camber grinding principle, the emery wheel surface of revolution and processed ball nut inside spin roller surface can form the contact wire (being the line of cut) in a space.Cut shape parameter and emery wheel installation technology parameter according to known ball nut raceway normal direction, set up ball nut roller surface equation, obtain a series of contact points between emery wheel and the ball nut spiral rolling track face, promptly obtain the contour curve of emery wheel.This contour curve is turned round the surface of revolution that obtains emery wheel around the emery wheel axis, be the grinding wheel profile under any setting angle.Concrete steps are as follows:
1, sets up the ball nut coordinate system, emery wheel coordinate system, ball nut raceway normal direction coordinate system
2, set up raceway surface geometry model
3, find the solution the coordinate of emery wheel cross section and raceway contact point
4, the institute of emery wheel and raceway has point of contact in the calculating variable-value scope, and contact point is transformed into the emery wheel coordinate system, promptly obtain the contour curve of emery wheel, this contour curve is turned round the surface of revolution that obtains emery wheel around the emery wheel axis, be the grinding wheel profile under any setting angle.
Among the present invention, emery wheel mill bar can not be zero with the angle of ball nut axis, studies show that in the past, if adopting mill bar and nut axis angle is zero method, though processing length is unrestricted, the raceway over-cutting has appearred, and it is not perfectly two circular arcs that the raceway normal direction that obtains is cut shape.The present invention utilizes spiral camber grinding forming principle, sets up under any setting angle, and the computation model of ball nut grinding processing grinding wheel profile, and use the computer factorization.
Grinding race of the present invention need carry out several times, the cutting a shape and all will change of raceway during each grinding, thus every once or grinding several times just need cut shape and recomputate raceway, redress emery wheel, regrind and cut nut rolling way, machine nut after the circulation for several times.Compared with prior art, the present invention has better guaranteed the precision of raceway, and to large pitch ball screw nut precision height, it is simple that grinding wheel spindle cuts shape, can be applicable to the processing of high accuracy large lead ball nuts.
Description of drawings
Fig. 1 is the schematic diagram of big helical pitch nut mill bar and nut generation interference when adopting plain grinding technology.
Fig. 2 is a process chart of the present invention.
The specific embodiment
A kind of digital control continuous finishing method of large pitch ball screw nut of the present invention, the angle of emery wheel mill bar and ball nut axis is carrying out grinding fine finishining to inner roller path of ball nut under the setting angle arbitrarily, accompanying drawing 2 is seen in concrete technological process, and it may further comprise the steps:
At first get the raw materials ready, raceway roughing is again heat-treated ball nut then, guarantees hardness 〉=HRC58; Adopt name to be called the application for a patent for invention of " method for accurately designing of profile of ball nut grinding wheel with great lead ", application number is the method in 200610052489.2, grinding wheel profile is designed, and large lead ball nuts is ground raceway fine finishining, concrete steps are as follows:
1. obtain the theoretical axle section shape of emery wheel according to the nut rolling way curved surface;
2. cutting a shape according to the theoretical axle of emery wheel obtains revised grinding wheel spindle and cuts the shape curve;
3. emery wheel is revised;
4. adopt emery wheel that large lead ball nuts is ground raceway fine finishining.
Grinding race carries out several times, every once or grinding several times just raceway is cut shape and recomputates, redress emery wheel, regrind and cut nut rolling way, obtain large lead ball nuts after the circulation for several times.
The present invention is to large pitch ball screw nut precision height, and it is simple that grinding wheel spindle cuts shape, has better guaranteed the precision of raceway, is applied to the processing of high accuracy large lead ball nuts.
Claims (1)
1, a kind of digital control continuous finishing method of large pitch ball screw nut is characterized in that: the angle of emery wheel mill bar and ball nut axis is carrying out grinding fine finishining to inner roller path of ball nut under the setting angle arbitrarily, and it may further comprise the steps:
1) gets the raw materials ready;
2) raceway roughing;
3) ball nut is heat-treated, guarantee hardness 〉=HRC58;
4) large lead ball nuts is ground raceway fine finishining, step is as follows:
1. obtain the theoretical axle section shape of emery wheel according to the nut rolling way curved surface;
2. cutting a shape according to the theoretical axle of emery wheel obtains revised grinding wheel spindle and cuts the shape curve;
3. emery wheel is revised;
4. adopt emery wheel that large lead ball nuts is ground raceway fine finishining; Grinding race carries out several times, every once or grinding several times just raceway is cut shape and recomputates, redress emery wheel, regrind and cut nut rolling way, obtain large lead ball nuts after the circulation for several times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100224399A CN101323035A (en) | 2008-07-21 | 2008-07-21 | Digital control continuous finishing method of large pitch ball screw nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100224399A CN101323035A (en) | 2008-07-21 | 2008-07-21 | Digital control continuous finishing method of large pitch ball screw nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101323035A true CN101323035A (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100224399A Pending CN101323035A (en) | 2008-07-21 | 2008-07-21 | Digital control continuous finishing method of large pitch ball screw nut |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763650B (en) * | 2010-01-22 | 2011-08-24 | 浙江大学 | Circular fitting method of ball nut inner raceway grinding wheel cross section |
| CN107283004A (en) * | 2017-07-05 | 2017-10-24 | 朱礼峰 | Feed screw nut grinding technics and its milling apparatus |
| CN109202547A (en) * | 2018-10-10 | 2019-01-15 | 哈尔滨工业大学 | A kind of wheel grinding method for the grinding of big L/D ratio internal screw thread parallel axes |
| CN110757258A (en) * | 2019-12-30 | 2020-02-07 | 慈兴集团有限公司 | Method for machining inner spiral raceway of lead screw nut |
| CN113441911A (en) * | 2021-06-23 | 2021-09-28 | 陕西万方汽车零部件有限公司 | Integrated machining method for internal circulation steering nut |
| CN114454033A (en) * | 2022-04-11 | 2022-05-10 | 天津德科智控股份有限公司 | Ball guide pipe and machining device |
-
2008
- 2008-07-21 CN CNA2008100224399A patent/CN101323035A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101763650B (en) * | 2010-01-22 | 2011-08-24 | 浙江大学 | Circular fitting method of ball nut inner raceway grinding wheel cross section |
| CN107283004A (en) * | 2017-07-05 | 2017-10-24 | 朱礼峰 | Feed screw nut grinding technics and its milling apparatus |
| CN107283004B (en) * | 2017-07-05 | 2023-12-26 | 朱礼峰 | Screw nut grinding process |
| CN109202547A (en) * | 2018-10-10 | 2019-01-15 | 哈尔滨工业大学 | A kind of wheel grinding method for the grinding of big L/D ratio internal screw thread parallel axes |
| CN110757258A (en) * | 2019-12-30 | 2020-02-07 | 慈兴集团有限公司 | Method for machining inner spiral raceway of lead screw nut |
| CN110757258B (en) * | 2019-12-30 | 2020-09-08 | 慈兴集团有限公司 | Method for machining inner spiral raceway of lead screw nut |
| CN113441911A (en) * | 2021-06-23 | 2021-09-28 | 陕西万方汽车零部件有限公司 | Integrated machining method for internal circulation steering nut |
| CN114454033A (en) * | 2022-04-11 | 2022-05-10 | 天津德科智控股份有限公司 | Ball guide pipe and machining device |
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Open date: 20081217 |