CN1381330A - Technology for machining squeeze screw tap - Google Patents
Technology for machining squeeze screw tap Download PDFInfo
- Publication number
- CN1381330A CN1381330A CN 02114184 CN02114184A CN1381330A CN 1381330 A CN1381330 A CN 1381330A CN 02114184 CN02114184 CN 02114184 CN 02114184 A CN02114184 A CN 02114184A CN 1381330 A CN1381330 A CN 1381330A
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- CN
- China
- Prior art keywords
- thread forming
- processing method
- threaded portion
- forming tap
- tap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
A squeezing screw tap for forming internal screw of steel material is made up through turning and milling blank, heat treating, grinding spiral thread, and soft nitrification-transposition crystallizing. Its advantages are very long service life and high P/C ratio.
Description
Technical field
The present invention relates to a kind of processing method of thread forming tap, belong to the processing method of the ELEMENTARY INTRODUCTION TO NON instrument of machining cutlery class, particularly axle head screw.
Background technology
The common employing of the cutlery removal material on the bottom outlet basis that is used for the processing of steel part screw in the market forms.This processing method disadvantage is a lot, and particularly iron filings are difficult to remove in blind hole, influence in enormous quantities or automated production degree and effect, and it is exactly owing to the cutlery that does not find does not reach optimum state that present heavy industry industry has the lathe of many autocratic screws.In order to change this present situation, have indivedual cutlery manufactory to produce some chipless throwing cutleries, but technology and technological level do not reach a standard yet, be difficult to produce good screw, in use repair rate is higher, causes labor strength to increase, and the cutlery life-span is also shorter.For example: being equivalent on the 50# steel part to make M22-6H is 40 internal thread deeply, the hole count of each screw tap processing between 24-250, average about 180.The crudy instability expends higherly, thereby is difficult to promote.
Technology contents
Main purpose of the present invention provides that a kind of material by high-wearing feature, high red hardness is made and the processing method of economical and practical thread forming tap, the thread forming tap that utilizes this method to process can solve the internal thread chipless manufacturing of present steel material preferably, mainly is a difficult problem that solves in enormous quantities or automated production.The chipless that can be applied to rail vehicles axle shaft end three screws is processed in enormous quantities, and the chipless of vehicle wheel shaft axle head 16 screws is processed in enormous quantities, also can be used for other axle head or position fixedly the screw chipless of steel part process in enormous quantities.
In order to reach above purpose, the processing method of this thread forming tap is as follows: step 1: with lathe, milling machine turnning and milling blank; Step 2: the blank of step 1 gained heated in high temperature furnace heat-treat: step 3: will carry out heat treated blank and carry out sharpening thread forming of grinding;
When implementation step 3, allow grinding machine calibration and carry out the calibration grinding, make the cross section of threaded portion become positive n limit shape; Step 4: the n limit shape threaded portion of step 3 gained is heated to 510-580 degree enforcement tufftride Celsius---transposition in ammonia or potassium cyanide liquation or Cymag liquation, penetrant crystalline thickness is greater than 0.05 millimeter, and the penetrant crystalline filler is the N atom.
Because metal belongs to the constraint body-crystal of weak interaction, atom in the crystal can spread with extraneous atom transposition under certain condition, tungsten can have red hardness, chromium has good antirust candle performance, vanadium is the element that forms carbide strongly, and tungsten carbide has very high hardness and red hardness, and nitrogen-atoms is diffused in and can forms in the crystal of body-centered cubic lattic than the strong much bigger binding force of original crystal, tungsten, chromium, vanadium all belong to the crystal of body-centered cubic lattic, existing homemade steel W
18Cr
4V just belongs to the crystal of this body-centered cubic lattic, and idea is diffused into nitrogen-atoms in this body-centered cubic lattic, is easy to reach goal of the invention.
The thread forming tap that utilizes this method to process carries out machine and uses, can produce good screw, the theoretical life-span is cutlery powerful friction in steel material advancing a 1000-1500 rice, only weares and teares 0.01 millimeter, that is to say that the life-span is four times to six times of present product, in addition more.The excellent ratio of performance to price is arranged.
The specific embodiment
Adopt the W of well-known steel mill
18Cr
4The V steel are made, and with reference to standard GB/T967-94, GB/T968-94, GB/T969-94, implement following steps: step 1: with lathe, milling machine turnning and milling blank, the screw thread of blank is partly refused car system; Step 2: the blank of step 1 gained is heat-treated in the high temperature furnace heating, make shank hardness HRC45-52, blade reaches HRC64-66: step 3: will carry out heat treated blank and carry out grinding, a sharpening thread forming by single thread mill or accurate omnipotent mill; , stop ring logical in this step employing special use advised strict controlling dimension.
When carrying out step 3, allow grinding machine carry out the calibration grinding, make the cross section of threaded portion become regular hexagon; Step 4: become orthohexagonal threaded portion in ammonia (or in potassium cyanide or Cymag liquation) gas, to be heated to 560 degree enforcement tufftrides Celsius more than 5 hours the cross section of step 3 gained, penetrant crystalline thickness is greater than 0.05 millimeter, and the penetrant crystalline filler is the N atom.
By implementing tufftride after the sharpening moulding, the penetrant crystalline filler is the N atom, and NH3 or NaCN (KCN) are heated to about 560 degree Celsius and decomposite N, and its case hardness reaches HV900-950 after the crystallization, and filling the crystallization diffusion thickness must be greater than 0.05 millimeter.
Threaded portion cross section of the present invention can be processed into positive n (n=3,4,5,6,7 ...) and limit shape, as regular hexagon, octagon.
Claims (5)
1, a kind of processing method of thread forming tap is characterized in that step 1: with lathe, milling machine turnning and milling blank;
Step 2: the blank of step 1 gained heated in high temperature furnace heat-treat:
Step 3: will carry out heat treated blank and carry out grinding, a sharpening thread forming;
Cross section with threaded portion when grinding becomes the shape calibration grinding of n limit;
Step 4: the n limit shape threaded portion of step 3 gained is heated to 510-580 degree enforcement tufftride Celsius in ammonia or potassium cyanide liquation or Cymag liquation, makes penetrant crystalline thickness greater than 0.05 millimeter, the penetrant crystalline filler is the N atom.
2, as the processing method of claim 1 thread forming tap, the threaded portion cross section that it is characterized in that described step 4 and 5 be processed into positive n (n=3,4,5,6 ...) and limit shape.
3,, it is characterized in that the threaded portion cross section of described step 3 is processed into regular hexagon as the processing method of claim 1 thread forming tap.
4,, it is characterized in that the threaded portion tufftride is more than 5 hours in the described step 4 as the processing method of claim 1 thread forming tap.
5, as the processing method of claim 1 thread forming tap, it is characterized in that described step 2 when heat-treating, make screw tap shank hardness HRC45-52, blade reaches HRC64-66.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021141843A CN1162242C (en) | 2002-06-05 | 2002-06-05 | Technology for machining squeeze screw tap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021141843A CN1162242C (en) | 2002-06-05 | 2002-06-05 | Technology for machining squeeze screw tap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1381330A true CN1381330A (en) | 2002-11-27 |
| CN1162242C CN1162242C (en) | 2004-08-18 |
Family
ID=4742988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021141843A Expired - Fee Related CN1162242C (en) | 2002-06-05 | 2002-06-05 | Technology for machining squeeze screw tap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1162242C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699652A (en) * | 2012-06-18 | 2012-10-03 | 常州恒鼎工具制造有限公司 | Process for machining small-size all-ground chipless extrusion screw tap |
| CN104227151A (en) * | 2013-06-19 | 2014-12-24 | 许灵生 | Tapping knife |
| CN104339132A (en) * | 2014-09-15 | 2015-02-11 | 沈阳飞机工业（集团）有限公司 | Processing method for TC4 titanium alloy spiral groove screw tap |
| CN105364438A (en) * | 2014-08-14 | 2016-03-02 | 钴碳化钨硬质合金公司 | Method of making a cutting tap with a correction grind |
| CN106239041A (en) * | 2016-07-29 | 2016-12-21 | 余姚市婉珍五金厂 | A kind of fermentation tank fastening screw chasing processing technique |
| CN107309713A (en) * | 2017-06-30 | 2017-11-03 | 苏州精协机械制造有限公司 | It is a kind of to determine the method that screw grinder processes many rib thread forming tap parameters |
-
2002
- 2002-06-05 CN CNB021141843A patent/CN1162242C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699652A (en) * | 2012-06-18 | 2012-10-03 | 常州恒鼎工具制造有限公司 | Process for machining small-size all-ground chipless extrusion screw tap |
| CN104227151A (en) * | 2013-06-19 | 2014-12-24 | 许灵生 | Tapping knife |
| CN105364438A (en) * | 2014-08-14 | 2016-03-02 | 钴碳化钨硬质合金公司 | Method of making a cutting tap with a correction grind |
| CN104339132A (en) * | 2014-09-15 | 2015-02-11 | 沈阳飞机工业（集团）有限公司 | Processing method for TC4 titanium alloy spiral groove screw tap |
| CN106239041A (en) * | 2016-07-29 | 2016-12-21 | 余姚市婉珍五金厂 | A kind of fermentation tank fastening screw chasing processing technique |
| CN107309713A (en) * | 2017-06-30 | 2017-11-03 | 苏州精协机械制造有限公司 | It is a kind of to determine the method that screw grinder processes many rib thread forming tap parameters |
| CN107309713B (en) * | 2017-06-30 | 2019-03-29 | 苏州精协机械制造有限公司 | A kind of method that determining screw grinder processes more rib thread forming tap parameters |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1162242C (en) | 2004-08-18 |
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