CN102744473A - Screw tap suitable for numerical control machining for titanium alloy - Google Patents
Screw tap suitable for numerical control machining for titanium alloy Download PDFInfo
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- CN102744473A CN102744473A CN2012102267681A CN201210226768A CN102744473A CN 102744473 A CN102744473 A CN 102744473A CN 2012102267681 A CN2012102267681 A CN 2012102267681A CN 201210226768 A CN201210226768 A CN 201210226768A CN 102744473 A CN102744473 A CN 102744473A
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Abstract
The invention discloses a screw tap suitable for numerical control machining for titanium alloy, wherein the degree of the rear angle of the tool face of the screw tap is 25-45 degrees, and the width of the grinded edge back of the screw tap is 0.3-0.6 mm; according to the invention, the dimensions of the dimensions of the degree of the rear angle of the tool face of the screw tap and the width of the grinded edge back of the screw tap are changed, so that the cutting torque of the screw tap is greatly reduced during numerical control tapping, thus greatly reducing the breakage rate; during the numerical control tapping, only primary tapping needs to be performed on a numerical control machine tool by use of the screw tap instead of performing manual secondary tapping and tertiary tapping; and moreover, according to the invention, only the dimensions of the degree of the rear angle of the tool face of the screw tap and the width of the grinded edge back of the screw tap are changed, so that the machining and changing processes are simple, and the cost is lower.
Description
Technical field
The invention belongs to titanium alloy numerical control rigid tapping field, particularly a kind of screw tap that is applicable to the titanium alloy digital control processing.
Background technology
Titanium alloy excellent properties such as proportion is little, intensity is high because of having, heat resistance is good, corrosion resistance is good are applied in the space flight type product more and more widely.
Owing to reasons such as chip removal difficulty, cooling are insufficient, titanium alloy tapping is typical difficult manufacturing procedure.The elastic modelling quantity of titanium alloy is big, and processing is prone to resilience, has been tapping into form of thread during tapping on the workpiece and has been close to the screw tap tooth form, and frictional force is big, and the cutting total torque is big, so the easy locking of screw tap and fractureing during the numerical control rigid tapping.
Typical numerical control tapping scheme is on Digit Control Machine Tool, to attack with first tap to make the screw tap guiding, carries out craft again and attacks system.This tapping scheme can guarantee the perpendicularity and the position degree of screw tap better, reduces working strength of workers to a certain extent, attacks but still need carry out second tap, three, and efficient is not high.
New through looking into, the titanium alloy special screw tap is applicable to manual tapping more at present, and the patent of announcement does not all have the application note of numerical control processing, and titanium alloy numerical control special screw tap is still blank on the market at home.
Documents 1: like application number is that 200810230533.3 one Chinese patent application file discloses a kind of screw tap, it is characterized in that land width 0.3～0.5,2 °～19 ° of relief angles.This screw tap can reduce the contact area of screw tap and workpiece, and the cutting moment of torque is little, cuts more briskly, and simultaneously screw tap can on average improve 6～7 times service life.But this patent cutting moment of torque when carrying out the numerical control tapping is still too big, fractures easily.
Documents 2: application number is that 200920305557.0 one Chinese patent application file discloses a kind of screw tap, it is characterized in that back-off 0.2～0.3P, and the screw tap cutting tip is carried out sharpening, and increasing the screw tap relief angle is 20 °～25 °.This screw tap can reduce screw tap and screw thread frictional force, machining titanium alloy material screwed hole number >=100.Reforming technology is complicated.
Summary of the invention
The object of the present invention is to provide a kind ofly can directly be used for titanium alloy numerical control tapping, the cutting moment of torque is little when the numerical control tapping, and not frangible, and processing and remodelling technology simply is applicable to the screw tap of titanium alloy digital control processing.
The technical solution that realizes the object of the invention is:
A kind of screw tap that is applicable to the titanium alloy digital control processing, the knife face relief angles of its screw tap are 25 degree ~ 45 degree, and mill back width of land degree is 0.3 millimeter ~ 0.6 millimeter.
The present invention compared with prior art, its remarkable advantage:
1, the present invention changes the knife face relief angles of screw tap and the size of mill back width of land degree, makes screw tap cutting moment of torque when carrying out the numerical control tapping reduce greatly, has reduced the rate of fractureing greatly.
2, the present invention, only needs on Digit Control Machine Tool, once to attack system with this screw tap owing to reduced the rate of fractureing in the numerical control tapping, attacks and need not carry out artificial second tap and three again.
3, the present invention only changes the knife face relief angles of screw tap and the size of mill back width of land degree, so processing and remodelling technology is simple, cost is lower.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is a screw tap cutting sketch map of the present invention.
Fig. 2 is a sectional schematic diagram at the bottom of the common straight trough screw tap tooth.
Fig. 3 is a sectional schematic diagram at the bottom of the transformation of the way screw tap tooth of the present invention.
The specific embodiment
When general screw tap carried out titanium alloy numerical control rigid tapping, the common failure form was fracture.The screw tap fracture causes because of its cutting moment of torque is excessive.During tapping, the form of thread that has been tapping on the workpiece is close to the screw tap tooth form, screw tap moment of torsion=(tooth portion cutting reaction force+coefficient of friction * contact area) * screw tap radius.
Content according to Fig. 2 and Fig. 3; Regular tap among Fig. 2 is shoveled the relief angle transformation of the way, obtain the screw tap of the present invention among Fig. 3, contact area (black region among Fig. 2, Fig. 3) reduces about 80%; The screw tap moment of torsion is corresponding to be reduced approximately 80%, greatly reduces the probability of fracture.
But screw tap transformation of the way knife face relief angle also can not be excessive, if screw tap transformation of the way knife face relief angle α is excessive, angle of wedge β is too small, and the intensity variation of screw tap cutting blade collapses tooth easily and causes the screw tap inefficacy.
For making the existing enough little cutting moment of torque of screw tap, enough big blade intensity is arranged again, on the basis of fully test and data analysis, universal straight trough screw tap is changed system into special screw tap, satisfy titanium alloy material numerical control tapping requirement in batches.Special screw tap transformation of the way pattern is following:
1, fine thread screw tap: select for use import straight trough fine thread tap end to attack (M3～M12) carry out grinding to change a social system, mill back width of land degree 0.4mm～0.6mm, 25 °～40 ° of knife face relief angles.
2, coarse thread screw tap: select for use import straight trough coarse thread tap end to attack (M3～M12) carry out grinding to change a social system, mill back width of land degree 0.3mm～0.5mm, 30 °～45 ° of knife face relief angles.
Screw tap after the improvement is compared with documents 2 with documents 1; The knife face relief angles increases; It is over half to make friction area reduce; Can make reducing of point of a knife intensity but increase the knife face relief angles simply, the present invention makes friction area and point of a knife intensity reach an equalization point through repeatedly experimental verification.
Embodiment 1: adopt import straight trough fine thread tap end to attack (M3) and carry out the grinding transformation of the way; Mill back width of land degree 0.4mm, 25 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
Embodiment 2: adopt import straight trough fine thread tap end to attack (M5) and carry out the grinding transformation of the way; Mill back width of land degree 0.5mm, 40 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
Embodiment 3: adopt import straight trough fine thread tap end to attack (M8) and carry out the grinding transformation of the way; Mill back width of land degree 0.6mm, 35 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
Embodiment 4: adopt import straight trough fine thread tap end to attack (M12) and carry out the grinding transformation of the way; Mill back width of land degree 0.45mm, 30 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
Embodiment 5: adopt import straight trough coarse thread tap end to attack (M4) and carry out the grinding transformation of the way; Mill back width of land degree 0.3mm, 30 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
Embodiment 6: adopt import straight trough coarse thread tap end to attack (M6) and carry out the grinding transformation of the way; Mill back width of land degree 0.4mm, 35 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
Embodiment 7: adopt import straight trough coarse thread tap end to attack (M7) and carry out the grinding transformation of the way; Mill back width of land degree 0.5mm, 40 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
Embodiment 8: adopt import straight trough coarse thread tap end to attack (M9) and carry out the grinding transformation of the way; Mill back width of land degree 0.45mm, 45 ° of knife face relief angles adopt numerical control rigid tapping mode to process many batches of pressurized struts; Surplus in the of about 100; Screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.
The process of the transformation of the way is following:
Transformation of the way example 1:
The enforcement of transformation of the way screw tap on the pressurized strut air vent, titanium alloy material TC4 pressurized strut assembling is φ 2 air vent oral area valve lines and air bleed valve contact seal when using.The M5X0.5-6H of this place screwed hole taked the machine tap holder to attack in the past, and pincers worker two tappings become, and the problem that often occurs is that the pincers worker tap is dark excessively, destroyed φ 2 air vent oral area valve lines, caused part to reprocess.Adopt numerical control rigid tapping mode to process surplus many batches 100 of the pressurized struts, screw thread delivery-check qualified rate 100%, screw thread and φ 2 hole axialities meet the demands, and it is coaxial that to test tool qualified.Adopt M5X0.5 straight trough screw tap, 35 ° of back-off angles, land width 0.45mm.
Transformation of the way example 2:
Lathe was attacked the M8X0.75-6H first tap in the past, and screw thread is returned in pincers worker.Because oral area positioning table terrace is little when returning screw thread, 14X14 only, the screw thread that returns can not satisfy the axiality requirement, and causing assembling to be interfered need repeatedly reprocess.Adopt numerical control rigid tapping mode to process surplus many batches 200 of the housings at present, screw thread delivery-check qualified rate 100%, screw thread and hole axiality meet the demands, and it is coaxial that to test tool qualified.Adopt M8X0.75 straight trough screw tap, 37 ° of back-off angles, land width 0.4mm.
Claims (3)
1. screw tap that is applicable to the titanium alloy digital control processing is characterized in that: the knife face relief angles of screw tap is 25 degree ~ 45 degree, and mill back width of land degree is 0.3 millimeter ~ 0.6 millimeter.
2. a kind of screw tap that is applicable to the titanium alloy digital control processing according to claim 1 is characterized in that: when screw tap was fine thread tap, the knife face relief angles was 25 degree ~ 40 degree, and mill back width of land degree is 0.4 millimeter ~ 0.6 millimeter.
3. a kind of screw tap that is applicable to the titanium alloy digital control processing according to claim 1 is characterized in that: when screw tap was coarse thread tap, the knife face relief angles was 30 degree ~ 45 degree, and mill back width of land degree is 0.3 millimeter ~ 0.5 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102267681A CN102744473A (en) | 2012-07-03 | 2012-07-03 | Screw tap suitable for numerical control machining for titanium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102267681A CN102744473A (en) | 2012-07-03 | 2012-07-03 | Screw tap suitable for numerical control machining for titanium alloy |
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| CN102744473A true CN102744473A (en) | 2012-10-24 |
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| CN2012102267681A Pending CN102744473A (en) | 2012-07-03 | 2012-07-03 | Screw tap suitable for numerical control machining for titanium alloy |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172690Y (en) * | 1993-02-27 | 1994-07-27 | 天津中德现代工业技术培训中心 | Tap with large-diameter thread groove |
| US5487626A (en) * | 1993-09-07 | 1996-01-30 | Sandvik Ab | Threading tap |
| CN2230199Y (en) * | 1995-08-31 | 1996-07-03 | 杨晞 | Tap |
| US20060199654A1 (en) * | 2003-08-04 | 2006-09-07 | Lindh Adcock Neil W | Tap and a method of tapping |
| CN101549422A (en) * | 2009-05-14 | 2009-10-07 | 沈阳飞机工业（集团）有限公司 | Special screw tap for machining titanium alloy |
| CN102357685A (en) * | 2011-09-22 | 2012-02-22 | 西安北方光电科技防务有限公司 | Tapping method for small-diameter internal threaded blind hole of titanium alloy part and tap thereof |
| CN202701532U (en) * | 2012-07-03 | 2013-01-30 | 南京晨光集团有限责任公司 | Screw tap applicable to numerical-control machining of titanium alloy |
-
2012
- 2012-07-03 CN CN2012102267681A patent/CN102744473A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2172690Y (en) * | 1993-02-27 | 1994-07-27 | 天津中德现代工业技术培训中心 | Tap with large-diameter thread groove |
| US5487626A (en) * | 1993-09-07 | 1996-01-30 | Sandvik Ab | Threading tap |
| CN2230199Y (en) * | 1995-08-31 | 1996-07-03 | 杨晞 | Tap |
| US20060199654A1 (en) * | 2003-08-04 | 2006-09-07 | Lindh Adcock Neil W | Tap and a method of tapping |
| CN101549422A (en) * | 2009-05-14 | 2009-10-07 | 沈阳飞机工业（集团）有限公司 | Special screw tap for machining titanium alloy |
| CN102357685A (en) * | 2011-09-22 | 2012-02-22 | 西安北方光电科技防务有限公司 | Tapping method for small-diameter internal threaded blind hole of titanium alloy part and tap thereof |
| CN202701532U (en) * | 2012-07-03 | 2013-01-30 | 南京晨光集团有限责任公司 | Screw tap applicable to numerical-control machining of titanium alloy |
Non-Patent Citations (1)
| Title |
|---|
| A•C•阿纳尼耶夫: "用丝锥攻钛合金螺纹时的切削力和精度", 《航空制造技术》 * |
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Application publication date: 20121024 |