CN104668682A - Method and tooling for electric spark machining of internal thread of hard alloy product - Google Patents
Method and tooling for electric spark machining of internal thread of hard alloy product Download PDFInfo
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- CN104668682A CN104668682A CN201510102061.3A CN201510102061A CN104668682A CN 104668682 A CN104668682 A CN 104668682A CN 201510102061 A CN201510102061 A CN 201510102061A CN 104668682 A CN104668682 A CN 104668682A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
- B23H9/003—Making screw-threads or gears
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
- B23H11/003—Mounting of workpieces, e.g. working-tables
Abstract
The invention discloses a method and a tooling for electric spark machining of an internal thread of a hard alloy product. The method comprises the following steps of S1: thread bottom hole machining; S2: tooling fabrication, including fabricating an electrode for discharging to the hard alloy product and a spiral clamping device for clamping the hard alloy product, and specifically including the following steps of S21: electrode fabrication; S22: spiral clamping device fabrication; S3: tooling installation; S4: product clamping; S5: internal thread machining, wherein the tooling includes the electrode for discharging to the hard alloy product and the spiral clamping device for clamping the hard alloy product. The method and the tooling for electric spark machining of the internal thread of the hard alloy product disclosed by the invention have the advantage that the machining of the internal thread of the hard alloy product and the machining of various internal circular large spiral grooves can be performed on an electric spark machine tool without Z-axis rotation.
Description
Technical field
The invention belongs to carbide alloy manufacturing technology field, be specifically related to a kind of processing method and frock of spark machined hard metal article internal thread.
Background technology
Carbide alloy manufacturing process by compound prepare, compressing and sintering three parts form.Although carbide alloy internal thread can be shaped by special mold pressing or pressed compact vehicle processing, but larger contraction heterogeneous can be produced because pressed compact sinters end article into, so be difficult to ensure that size and the accuracy of form and position of rear sintering cemented carbide goods internal thread are shunk in generation, therefore the internal thread of sintering cemented carbide goods can only have been processed by postorder.
The processing of internal thread can only adopt the processing methods such as car, tapping, whirling mill usually, sintering cemented carbide goods have high hardness, postorder processing can only be carried out with mill processing, Linear cut and electric spark, the female thread machining methods such as car, tapping, whirling mill cannot be used for processing the internal thread of sintering cemented carbide goods, mill processing and linear cutter can not realize the processing of internal thread, therefore only have electric discharge machining method can be used for processing carbide alloy internal thread.
Usual spark machined internal thread to be rotated by electroded Z axis and the motion of translation device of clamping product has come, this processing method leans on the mode of precession gradually to complete, electrode is actual, and effectively work area is less, working (machining) efficiency is lower, the athletic meeting of translation device makes electrode and product that certain collision occur, affect the quality of internal thread, hart metal product with link type internal thread has certain demand, how to improve the efficiency of carbide alloy internal thread machining, better carbide alloy internal thread machining quality needs in the industry technical problem perfect further.
Summary of the invention
The object of the invention is to: Problems existing during the spark machined hard metal article internal thread rotated for Z axis in prior art, the processing method of the spark machined hard metal article internal thread providing a kind of non-Z axis to rotate.
To achieve these goals, the technical solution used in the present invention is:
A processing method for spark machined hard metal article internal thread, comprises the following steps:
S1. thread Pilot hole processing, hard metal article processes thread Pilot hole;
S2. frock making, comprise the spiral clamping device of electrode and the clamping hard metal article made hard metal article electric discharge, concrete steps are as follows;
S21. electrode fabrication, first electrode matrix is processed, then the hard metal article internal thread tooth form processed on electrode matrix and require to process, line number, rotation direction, pitch, large footpath, central diameter, path distinguish identical external screw thread, finally cut on electrode matrix, until the thread Pilot hole of hard metal article can be filled in, retain radian is the flank of α simultaneously, α < π;
S22. spiral clamping device makes, comprise and make screwed support member and revolving part, and the fixture of clamping hard metal article, revolving part and support member can screw togather mutually, and both pitch, rotation direction are identical with the hard metal article internal thread pitch requiring to process, rotation direction respectively;
S3. frock is installed, the support member of spiral clamping device is arranged on the workbench of spark-erosion machine tool, revolving part is screwed in support member by threaded portion, and fixture is arranged on revolving part end face, and guarantees that fixture is parallel with workbench with the shaft center line of revolving part; Electrode is arranged on electric discharge machine simultaneously;
S4. product clamping, will process the hard metal article clamping of thread Pilot hole on fixture, and guarantee that the axial line of the thread Pilot hole of hard metal article overlaps with the shaft center line of fixture;
S5. internal thread machining, electrode is sent in the thread Pilot hole of hard metal article by electric discharge machine, and guarantee the longitudinal center line in electrode machining face and the axis parallel of thread Pilot hole, along the line direction in the axle center of the axial centre in electrode machining face and thread Pilot hole, control electrode feed, electric discharge processing, until stop during the axis coinciding of the axial centre in electrode machining face and thread Pilot hole, control electrode is along the opposite direction translation of feed, retreat to the position that electrode puts into thread Pilot hole for the first time, complete the processing of first paragraph internal thread; Twisting revolving part, revolving part is made to rotate β angle, β is less than angle corresponding to α, and then the line direction in axle center along the axial centre in electrode machining face and thread Pilot hole, control electrode feed, electric discharge processing, until stop during the axis coinciding of the axial centre in electrode machining face and thread Pilot hole, control electrode, along the opposite direction translation of feed, retreats to the position that electrode puts into thread Pilot hole for the first time, completes the processing of second segment internal thread; According to aforesaid procedure of processing, twist revolving part, feed, electric discharge processing and withdrawing successively, until complete the processing of the whole internal thread of hard metal article.
Preferably, in the manufacturing process of electrode, first the pole shape electrode matrix that diameter is identical with the large footpath of hard metal article internal thread requiring to process is processed, then process on electrode matrix can with the external screw thread of the hard metal article internal screw-thread screw requiring to process, electrode matrix is cut into two halves by the axis of rotation then along electrode matrix, again along and orthogonal two symmetrical planes of cut surface and distance between two symmetrical planes is in 4/3 to five/5ths scopes of electrode matrix diameter, cut by electrode matrix, mid portion is electrode.
Preferably, the distance between two symmetrical planes is 3/4ths of electrode matrix diameter.
Preferably, at the electrode be made into, two 90 ° of corner angle is carried out 45 ° of chamferings.
Preferably, in internal thread machining process, the angle beta that revolving part rotates at every turn is 92 °.
Preferably, in internal thread machining process, effective working position of electric discharging machining electrode goes out head end and exceedes processed internal thread bottom outlet and go out head end at least l pitch.
The present invention also provides a kind of frock of spark machined hard metal article internal thread, comprises the electrode to hard metal article electric discharge and the spiral clamping device of clamping hard metal article;
Described electrode comprises the electrode matrix can filling in hard metal article thread Pilot hole, and electrode matrix surface is provided with distinguishes identical external screw thread with the hard metal article internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, path;
Described spiral clamping device comprises the support member and revolving part that are mutually screwed togather by screw thread, and the fixture of clamping hard metal article, the pitch of revolving part and support member, rotation direction are identical with the hard metal article internal thread pitch requiring to process, rotation direction respectively, fixture is arranged on the end of revolving part, and both shaft center line conllinear.
Preferably, described fixture adopts chuck or scroll chuck.
Preferably, the screw thread of support member is internal thread, and the screw thread of revolving part is external screw thread, and the spiral shell button of support member is no less than 12 buttons, and the spiral shell button of revolving part is no less than 10 buttons, and the spiral shell button of support member 2 buttons at least more than the spiral shell button of revolving part.
Preferably, described support member is also provided with the lock-screw of locking revolving part.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
1. on the spark-erosion machine tool do not rotated with Z axis, also can carry out the processing of carbide alloy internal thread.
2. process principle of the present invention can be passed and process sintering cemented carbide goods various classification inner circle king bolt groove.
3. process principle of the present invention can also be passed and process circular concave in other sintering cemented carbide goods various types of do not solved by mill processing and powder mixed dielectric EDM mode.
Accompanying drawing explanation
Fig. 1 is position cross sectional representation of effectively discharging in electrode fabrication process of the present invention.
Fig. 2 is electrode structure schematic diagram of the present invention.
Fig. 3 is spiral clamping device structural representation of the present invention.
Fig. 4 is spiral clamping device full sectional view of the present invention.
Fig. 5 is hard metal article internal thread of the present invention view to be processed.
Fig. 6 is hard metal article internal thread machining view of the present invention.
Mark in figure: 1-support member, 2-revolving part, 3-fixture, 4-electrode, 5-hard metal article, 6-lock-screw.
Detailed description of the invention
By following embodiment, technical scheme of the present invention is further described.
Embodiment 1:
The processing method of a kind of spark machined hard metal article internal thread of the present invention:
Hard alloy is: YG8
Product processing requires: product internal thread specification is M8 right-handed thread, and the large footpath of M8 internal thread tooth is the path of 8mm, M8 internal thread is 6.75mm, and central diameter is 7mm, and the path of 1/2nd is 3.375mm, and pitch is 1.25mm, and thread segment length is 10mm.
Procedure of processing is as follows:
S1. thread Pilot hole processing, hard metal article 5 processes the thread Pilot hole that diameter is 6.75mm.
S2. frock making, comprise the spiral clamping device of the electrode 4 and clamping hard metal article 5 made hard metal article 5 electric discharge, concrete steps are as follows:
S21. electrode 4 makes, with reference to Fig. 1, Fig. 2, first the diameter pole shape electrode matrix identical with the large footpath of hard metal article 5 internal thread requiring to process (shown with reference to a part in Fig. 1) is processed, then processing on electrode matrix can with the hard metal article 5 internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, the external screw thread (shown with reference to b part in Fig. 1) that path is identical respectively, electrode matrix is cut into two halves (shown with reference to c part in Fig. 1) by the axis of rotation then along electrode matrix, again along two symmetrical planes orthogonal with cut surface, and the distance between two symmetrical planes is 3/4ths of electrode matrix diameter, the symmetry of two symmetrical planes is 0.1, electrode matrix is cut, mid portion is electrode 4, the angle that the radian measure alpha in corresponding external screw thread face is corresponding is 97 ° 36 ' (shown with reference to d part in Fig. 1), at the electrode 4 be made into, two 90 ° of corner angle is carried out 45 ° of chamferings (shown with reference to e part in Fig. 1), like this, safe distance between electrode 4 and hard metal article 5 is larger, and the length of the axial effectively working position of electric discharging machining electrode 4 is 20 ㎜.
S22. spiral clamping device makes, with reference to Fig. 3, Fig. 4, comprise and make screwed support member 1 and revolving part 2, and the fixture 3 of clamping hard metal article 5, revolving part 2 and support member 1 can screw togather mutually, and both pitch, rotation direction are identical with the hard metal article 5 internal thread pitch requiring to process, rotation direction respectively.
S3. frock is installed, the support member 1 of spiral clamping device is arranged on the workbench of spark-erosion machine tool, revolving part 2 is screwed in support member 1 by threaded portion, and fixture 3 is arranged on revolving part 2 end face, and guarantees that fixture 3 is parallel with workbench with the shaft center line of revolving part 2; Electrode 4 is arranged on electric discharge machine simultaneously.
S4. product clamping, will process hard metal article 5 clamping of thread Pilot hole on fixture 3, and guarantee that the axial line of the thread Pilot hole of hard metal article 5 overlaps with the shaft center line of fixture 3.
S5. internal thread machining, with reference to Fig. 5, Fig. 6, electrode 4 is sent in the thread Pilot hole of hard metal article 5 by electric discharge machine, and guarantee the longitudinal center line of electrode 4 machined surface and the axis parallel of thread Pilot hole, and effective working position of electric discharging machining electrode 4 goes out head end exceedes processed internal thread and go out head end 2 spiral shell buttons; Along the line direction in the axle center of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 is along the opposite direction translation of feed, retreat to the position that electrode 4 puts into thread Pilot hole for the first time, complete the processing of first paragraph internal thread; Twisting revolving part 2, revolving part 2 is made to rotate β angle, β=92 ° ± 1 °, and then the line direction in axle center along the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4, along the opposite direction translation of feed, retreats to the position that electrode 4 puts into thread Pilot hole for the first time, completes the processing of second segment internal thread; According to aforesaid procedure of processing, twist revolving part 2, feed, electric discharge processing and withdrawing successively, until complete the processing of the whole internal thread of hard metal article 5.
Anglec of rotation β is 92 ± 1 °, the angle that the radian measure alpha of machined surface is corresponding is 97 ° 36 ', anglec of rotation β is less than the angle of the radian measure alpha of machined surface, fully ensure that after rotating, undressed position is all in electric discharging machining electrode 4 coverage, the mat woven of fine bamboo strips one process 97 ° 36 ' add 3 times rotate 91 ° minimum × 3=273 ° equal 370 ° 36 ', exceed wholecircle 360 °, process product rotates and is no more than 1.05 circumference, therefore, it is possible to realize the full inner thread processing of docking comprehensively.
The frock of a kind of spark machined hard metal article 5 internal thread of the present invention, comprises the electrode 4 and the spiral clamping device of clamping hard metal article 5 that discharge to hard metal article 5.
Electrode 4 comprises the electrode matrix can filling in hard metal article 5 thread Pilot hole,
Electrode matrix surface is provided with distinguishes identical external screw thread with the hard metal article 5 internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, path, can fill in hard metal article 5 thread Pilot hole in order to ensure electrode 5, the radian in external screw thread face is the angle that α, α are corresponding is 97 ° 36 '.Meanwhile, according to the processing request of hard metal article 5 internal thread, the screw thread of the machined surface of electrode 5 selects tooth form to be triangular form, and line number is 1, and rotation direction is dextrorotation, and pitch is 1.25mm, and large footpath is 8mm, and central diameter is 7mm.
Spiral clamping device comprises the support member 1 and revolving part 2 that are mutually screwed togather by screw thread, and the fixture 3 of clamping hard metal article 5, the pitch of revolving part 2 and both support members 1, rotation direction are identical with the hard metal article 5 internal thread pitch requiring to process, rotation direction respectively, namely pitch is 1.25mm, rotation direction is dextrorotation, fixture 3 is arranged on the end of revolving part 2, and both shaft center line conllinear, fixture 3 adopts chuck.
The screw thread of support member 1 is internal thread, the screw thread of revolving part 2 is external screw thread, the spiral shell button of support member 1 is 18 buttons, the spiral shell button of revolving part 2 is 15 buttons, on support member, 1 is provided with the lock-screw 6 locking revolving part 2, rotate to the angle of regulation at revolving part 2 after, by lock-screw 6, revolving part 2 is locked.
Embodiment 2:
The processing method of a kind of spark machined hard metal article internal thread of the present invention:
Hard alloy is: YN10
Product processing requires: product internal thread specification is M10 left hand thread, and the large footpath of M10 internal thread tooth is the path of 10mm, M10 internal thread is 8.376mm, and central diameter is 9.026mm, and the path of 1/2nd is 4.188mm, and pitch is 1.5mm, and thread segment length is 22.5mm.
Procedure of processing is as follows:
S1. thread Pilot hole processing, hard metal article 5 processes the thread Pilot hole that diameter is 8.376mm.
S2. frock making, comprise the spiral clamping device of the electrode 4 and clamping hard metal article 5 made hard metal article 5 electric discharge, concrete steps are as follows:
S21. electrode 4 makes, with reference to Fig. 1, Fig. 2, first the diameter pole shape electrode matrix identical with the large footpath of hard metal article 5 internal thread requiring to process (shown with reference to a part in Fig. 1) is processed, then processing on electrode matrix can with the hard metal article 5 internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, the external screw thread (shown with reference to b part in Fig. 1) that path is identical respectively, electrode matrix is cut into two halves (shown with reference to c part in Fig. 1) by the axis of rotation then along electrode matrix, again along two symmetrical planes orthogonal with cut surface, and the distance between two symmetrical planes is 3/5ths of electrode matrix diameter, the symmetry of two symmetrical planes is 0.1, electrode matrix is cut, mid portion is electrode 4, the angle that the radian measure alpha in corresponding external screw thread face is corresponding is 73 ° 44 ' (shown with reference to d part in Fig. 1), at the electrode 4 be made into, two 90 ° of corner angle is carried out 45 ° of chamferings (shown with reference to e part in Fig. 1), the length of the axial effectively working position of electric discharging machining electrode 4 is 25 ㎜.
S22. spiral clamping device makes, with reference to Fig. 3, Fig. 4, comprise and make screwed support member 1 and revolving part 2, and the fixture 3 of clamping hard metal article 5, revolving part 2 and support member 1 can screw togather mutually, and both pitch, rotation direction are identical with the hard metal article 5 internal thread pitch requiring to process, rotation direction respectively.
S3. frock is installed, the support member 1 of spiral clamping device is arranged on the workbench of spark-erosion machine tool, revolving part 2 is screwed in support member 1 by threaded portion, and fixture 3 is arranged on revolving part 2 end face, and guarantees that fixture 3 is parallel with workbench with the shaft center line of revolving part 2; Electrode 4 is arranged on electric discharge machine simultaneously.
S4. product clamping, will process hard metal article 5 clamping of thread Pilot hole on fixture 3, and guarantee that the axial line of the thread Pilot hole of hard metal article 5 overlaps with the shaft center line of fixture 3.
S5. internal thread machining, with reference to Fig. 5, Fig. 6, electrode 4 is sent in the thread Pilot hole of hard metal article 5 by electric discharge machine, and guarantee the longitudinal center line of electrode 4 machined surface and the axis parallel of thread Pilot hole, and effective working position of electric discharging machining electrode 4 goes out head end exceedes processed internal thread and go out head end 2 spiral shell buttons; Along the line direction in the axle center of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 is along the opposite direction translation of feed, retreat to the position that electrode 4 puts into thread Pilot hole for the first time, complete the processing of first paragraph internal thread; Twisting revolving part 2, revolving part 2 is made to rotate β angle, β=70 ° ± 1 °, and then the line direction in axle center along the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4, along the opposite direction translation of feed, retreats to the position that electrode 4 puts into thread Pilot hole for the first time, completes the processing of second segment internal thread; According to aforesaid procedure of processing, twist revolving part 2, feed, electric discharge processing and withdrawing successively, until complete the processing of the whole internal thread of hard metal article 5.
Anglec of rotation β is 70 ± 1 °, the angle that the radian measure alpha of machined surface is corresponding is 73 ° 44 ', the angle that anglec of rotation β is more corresponding than the radian measure alpha of machined surface is little, fully ensure that after rotating, undressed position is all in electric discharging machining electrode 4 coverage, the mat woven of fine bamboo strips one process 73 ° 44 ' add 5 times rotate 70 ° minimum × 5=350 ° equal 423 ° 44 ', exceed wholecircle 360 °, therefore, it is possible to realize the full inner thread processing of docking comprehensively.
The frock of a kind of spark machined hard metal article 5 internal thread of the present invention, comprises the electrode 4 and the spiral clamping device of clamping hard metal article 5 that discharge to hard metal article 5.
Electrode matrix surface is provided with distinguishes identical external screw thread with the hard metal article 5 internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, path, can fill in hard metal article 5 thread Pilot hole in order to ensure electrode 5, the radian in external screw thread face is the angle that α, α are corresponding is 73 ° 44 '.Meanwhile, according to the processing request of hard metal article 5 internal thread, the screw thread of the machined surface of electrode 4 selects tooth form to be triangular form, and line number is 1, and rotation direction is left-handed, and pitch is 1.5mm, and large footpath is 10mm, and central diameter is 9.026mm.
Spiral clamping device comprises the support member 1 and revolving part 2 that are mutually screwed togather by screw thread, and the fixture 3 of clamping hard metal article 5, the pitch of revolving part 2 and both support members 1, rotation direction are identical with the hard metal article 5 internal thread pitch requiring to process, rotation direction respectively, namely pitch is 1.5mm, rotation direction is left-handed, fixture 3 is arranged on the end of revolving part 2, and both shaft center line conllinear, fixture 3 adopts chuck.
The screw thread of support member 1 is internal thread, the screw thread of revolving part 2 is external screw thread, the spiral shell button of support member 1 is 18 buttons, the spiral shell button of revolving part 2 is 15 buttons, on support member, 1 is provided with the lock-screw 6 locking revolving part 2, rotate to the angle of regulation at revolving part 2 after, by lock-screw 6, revolving part 2 is locked.
Embodiment 3:
The processing method of a kind of spark machined hard metal article internal thread of the present invention:
Hard alloy is: YG20C
Product processing requires: product internal thread specification is M20 right-handed thread, and the large footpath of M20 internal thread tooth is the path of 20mm, M20 internal thread is 17.294mm, central diameter is 18.376mm, the path of 1/2nd is 8.647mm, and pitch is 2.5mm, and thread segment length is 32.5mm.
Procedure of processing is as follows:
S1. thread Pilot hole processing, hard metal article 5 processes the thread Pilot hole that diameter is 17.294mm.
S2. frock making, comprise the spiral clamping device of the electrode 4 and clamping hard metal article 5 made hard metal article 5 electric discharge, concrete steps are as follows:
S21. electrode 4 makes, with reference to Fig. 1, Fig. 2, first the diameter pole shape electrode matrix identical with the large footpath of hard metal article 5 internal thread requiring to process (shown with reference to a part in Fig. 1) is processed, then processing on electrode matrix can with the hard metal article 5 internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, the external screw thread (shown with reference to b part in Fig. 1) that path is identical respectively, electrode matrix is cut into two halves (shown with reference to c part in Fig. 1) by the axis of rotation then along electrode matrix, again along two symmetrical planes orthogonal with cut surface, and the distance between two symmetrical planes is 4/5ths of electrode matrix diameter, the symmetry of two symmetrical planes is 0.1, electrode matrix is cut, mid portion is electrode 4, the angle that the radian measure alpha in corresponding external screw thread face is corresponding is 106 ° 16 ' (shown with reference to d part in Fig. 1), at the electrode 4 be made into, two 90 ° of corner angle is carried out 45 ° of chamferings (shown with reference to e part in Fig. 1), the length of the axial effectively working position of electric discharging machining electrode 4 is 35 ㎜.
S22. spiral clamping device makes, with reference to Fig. 3, Fig. 4, comprise and make screwed support member 1 and revolving part 2, and the fixture 3 of clamping hard metal article 5, revolving part 2 and support member 1 can screw togather mutually, and both pitch, rotation direction are identical with the hard metal article 5 internal thread pitch requiring to process, rotation direction respectively.
S3. frock is installed, the support member 1 of spiral clamping device is arranged on the workbench of spark-erosion machine tool, revolving part 2 is screwed in support member 1 by threaded portion, and fixture 3 is arranged on revolving part 2 end face, and guarantees that fixture 3 is parallel with workbench with the shaft center line of revolving part 2; Electrode 4 is arranged on electric discharge machine simultaneously.
S4. product clamping, will process hard metal article 5 clamping of thread Pilot hole on fixture 3, and guarantee that the axial line of the thread Pilot hole of hard metal article 5 overlaps with the shaft center line of fixture 3.
S5. internal thread machining, with reference to Fig. 5, Fig. 6, electrode 4 is sent in the thread Pilot hole of hard metal article 5 by electric discharge machine, and guarantee the longitudinal center line of electrode 4 machined surface and the axis parallel of thread Pilot hole, and effective working position of electric discharging machining electrode 4 goes out head end exceedes processed internal thread and go out head end 2 spiral shell buttons; Along the line direction in the axle center of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 is along the opposite direction translation of feed, retreat to the position that electrode 4 puts into thread Pilot hole for the first time, complete the processing of first paragraph internal thread; Twisting revolving part 2, revolving part 2 is made to rotate β angle, β=100 ° ± 1 °, and then the line direction in axle center along the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4 feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode 4 machined surface and thread Pilot hole, control electrode 4, along the opposite direction translation of feed, retreats to the position that electrode 4 puts into thread Pilot hole for the first time, completes the processing of second segment internal thread; According to aforesaid procedure of processing, twist revolving part 2, feed, electric discharge processing and withdrawing successively, until complete the processing of the whole internal thread of hard metal article 5.
Anglec of rotation β is 100 ± 1 °, the angle that the radian measure alpha of machined surface is corresponding is 106 ° 16 ', the angle that anglec of rotation β is more corresponding than the radian measure alpha of machined surface is little, fully ensure that after rotating, undressed position is all in electric discharging machining electrode 4 coverage, the mat woven of fine bamboo strips one process 106 ° 16 ' add 3 times rotate 100 ° minimum × 3=300 ° equal 406 ° 16 ', exceed wholecircle 360 °, therefore, it is possible to realize the full inner thread processing of docking comprehensively.
The frock of a kind of spark machined hard metal article 5 internal thread of the present invention, comprises the electrode 4 and the spiral clamping device of clamping hard metal article 5 that discharge to hard metal article 5.
Electrode matrix surface is provided with distinguishes identical external screw thread with the hard metal article 5 internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, path, can fill in hard metal article 5 thread Pilot hole in order to ensure electrode 5, the radian in external screw thread face is the angle that α, α are corresponding is 106 ° 16 '.Meanwhile, according to the processing request of hard metal article 5 internal thread, the screw thread of the machined surface of motor selects tooth form to be triangular form, and line number is 1, and rotation direction is dextrorotation, and pitch is 2.5mm, and large footpath is 20mm, and central diameter is 18.376mm.
Spiral clamping device comprises the support member 1 and revolving part 2 that are mutually screwed togather by screw thread, and the fixture 3 of clamping hard metal article 5, the pitch of revolving part 2 and both support members 1, rotation direction are identical with the hard metal article 5 internal thread pitch requiring to process, rotation direction respectively, namely pitch is 2.5mm, rotation direction is dextrorotation, fixture 3 is arranged on the end of revolving part 2, and both shaft center line conllinear, fixture 3 adopts scroll chuck.
The screw thread of support member 1 is internal thread, the screw thread of revolving part 2 is external screw thread, the spiral shell button of support member 1 is 18 buttons, the spiral shell button of revolving part 2 is 15 buttons, on support member, 1 is provided with the lock-screw 6 locking revolving part 2, rotate to the angle of regulation at revolving part 2 after, by lock-screw 6, revolving part 2 is locked.
Claims (10)
1. a processing method for spark machined hard metal article internal thread, is characterized in that, comprises the following steps:
S1. thread Pilot hole processing, hard metal article (5) processes thread Pilot hole;
S2. frock making, comprise the spiral clamping device making electrode (4) and the clamping hard metal article (5) discharged to hard metal article (5), concrete steps are as follows:
S21. electrode (4) makes, first electrode matrix is processed, then hard metal article (5) the internal thread tooth form processed on electrode matrix and require to process, line number, rotation direction, pitch, large footpath, central diameter, path distinguish identical external screw thread, finally cut on electrode matrix, until the thread Pilot hole of hard metal article (5) can be filled in, retain radian is the flank of α simultaneously, α < π;
S22. spiral clamping device makes, comprise and make screwed support member (1) and revolving part (2), and the fixture (3) of clamping hard metal article (5), revolving part (2) and support member (1) can screw togather mutually, and both pitch, rotation direction are identical with hard metal article (5) the internal thread pitch requiring to process, rotation direction respectively;
S3. frock is installed, the support member (1) of spiral clamping device is arranged on the workbench of spark-erosion machine tool, revolving part (2) screws in support member (1) by threaded portion, fixture (3) is arranged on revolving part (2) end face, and guarantees that fixture (3) is parallel with workbench with the shaft center line of revolving part (2); Electrode (4) is arranged on electric discharge machine simultaneously;
S4. product clamping, to hard metal article (5) clamping of thread Pilot hole be processed on fixture (3), and guarantee that the axial line of the thread Pilot hole of hard metal article (5) overlaps with the shaft center line of fixture (3);
S5. internal thread machining, electrode (4) is sent in the thread Pilot hole of hard metal article (5) by electric discharge machine, and guarantee the longitudinal center line of electrode (4) machined surface and the axis parallel of thread Pilot hole, along the line direction in the axle center of the axial centre of electrode (4) machined surface and thread Pilot hole, control electrode (4) feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode (4) machined surface and thread Pilot hole, control electrode (4) is along the opposite direction translation of feed, retreat to the position that electrode (4) puts into thread Pilot hole for the first time, complete the processing of first paragraph internal thread, twisting revolving part (2), revolving part (2) is made to rotate β angle, β is less than angle corresponding to α, and then the line direction in axle center along the axial centre of electrode (4) machined surface and thread Pilot hole, control electrode (4) feed, electric discharge processing, until stop during the axis coinciding of the axial centre of electrode (4) machined surface and thread Pilot hole, control electrode (4) is along the opposite direction translation of feed, retreat to the position that electrode (4) puts into thread Pilot hole for the first time, complete the processing of second segment internal thread, according to aforesaid procedure of processing, twist revolving part (2), feed, electric discharge processing and withdrawing successively, until complete the processing of the whole internal thread of hard metal article (5).
2. processing method according to claim 1, it is characterized in that, in the manufacturing process of electrode (4), first the pole shape electrode matrix that diameter is identical with the large footpath of hard metal article (5) internal thread requiring to process is processed, then process on electrode matrix can with the external screw thread of hard metal article (5) internal screw-thread screw requiring to process, electrode matrix is cut into two halves by the axis of rotation then along electrode matrix, again along two symmetrical planes orthogonal with cut surface, and the distance between two symmetrical planes is in 4/3 to five/5ths scopes of electrode matrix diameter, electrode matrix is cut, mid portion is electrode (4).
3. processing method according to claim 2, is characterized in that, the distance between two symmetrical planes is 3/4ths of electrode matrix diameter.
4. processing method according to claim 3, is characterized in that, at the electrode be made into (4), two 90 ° of corner angle is carried out 45 ° of chamferings.
5. processing method according to claim 3, is characterized in that, in internal thread machining process, the angle beta that revolving part (2) rotates at every turn is 92 °.
6. processing method according to claim 1, is characterized in that, in internal thread machining process, effective working position of electric discharging machining electrode (4) goes out head end and exceedes processed internal thread bottom outlet and go out head end at least l pitch.
7. a frock for spark machined hard metal article internal thread, is characterized in that, comprises the spiral clamping device of electrode (4) and the clamping hard metal article (5) discharged to hard metal article (5);
Described electrode (4) comprises the electrode matrix can filling in hard metal article (5) thread Pilot hole, and electrode matrix surface is provided with distinguishes identical external screw thread with hard metal article (5) the internal thread tooth form requiring to process, line number, rotation direction, pitch, large footpath, central diameter, path;
Described spiral clamping device comprises the support member (1) and revolving part (2) that are mutually screwed togather by screw thread, and the fixture (3) of clamping hard metal article (5), revolving part (2) and support member (1) both pitch, rotation direction are identical with hard metal article (5) the internal thread pitch requiring to process, rotation direction respectively, fixture (3) is arranged on the end of revolving part (2), and both shaft center line conllinear.
8. the frock of spark machined hard metal article internal thread according to claim 7, is characterized in that, described fixture (3) adopts chuck or scroll chuck.
9. the frock of spark machined hard metal article internal thread according to claim 7, it is characterized in that, the screw thread of support member (1) is internal thread, the screw thread of revolving part (2) is external screw thread, the spiral shell button of support member (1) is no less than 12 buttons, the spiral shell button of revolving part (2) is no less than 10 buttons, and the spiral shell button of support member (1) 2 buttons at least more than the spiral shell button of revolving part (2).
10. the frock of spark machined hard metal article internal thread according to claim 9, is characterized in that, on described support member, (1) is also provided with the lock-screw (6) of locking revolving part (2).
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