CN104668682B - 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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- CN104668682B CN104668682B CN201510102061.3A CN201510102061A CN104668682B CN 104668682 B CN104668682 B CN 104668682B CN 201510102061 A CN201510102061 A CN 201510102061A CN 104668682 B CN104668682 B CN 104668682B
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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
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
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 hard alloy manufacturing technology field, be specifically related to a kind of spark machined hard alloy system
The processing method of product female thread and frock.
Background technology
Hard alloy manufacturing process prepared by compound, compressing and sintering three parts form.Hard alloy
Shape although female thread can be processed by special mold pressing or pressed compact vehicle, but owing to pressed compact sinters into finally
Goods can produce bigger contraction heterogeneous, so being difficult to ensure that sintering cemented carbide goods after generation contraction
The size of female thread and the accuracy of form and position, therefore the female thread of sintering cemented carbide goods can only be processed by postorder
Complete.
The processing of female thread is typically only capable to use the processing methods such as car, tapping, whirling mill to complete, hard
Alloy sintering goods have high hardness, and postorder processing can only be carried out with mill processing, line cutting and electric spark,
The female thread machining methods such as car, tapping, whirling mill cannot be used for the female thread to sintering cemented carbide goods
Being processed, mill processing and linear cutter can not realize the processing of female thread, the most only spark machined
Method can be used to be processed hard alloy female thread.
Generally spark machined female thread is to be rotated by electroded Z axis and the translation device of clamping product
Having moved, this processing method is that the mode by gradually precession completes, the actually active work of electrode
Area is less, and working (machining) efficiency is relatively low, and the athletic meeting of translation device makes electrode and product that certain collision to occur,
Affecting the quality of female thread, the hart metal product of band link type female thread has certain demand,
Can improve the efficiency of hard alloy internal thread machining, more preferable hard alloy internal thread machining quality is to need in the industry
Technical problem that will be the most perfect.
Summary of the invention
It is an object of the invention to: the spark machined hard metal article rotated for Z axis in prior art
The problem existed during female thread, it is provided that the spark machined hard metal article female thread that a kind of non-Z axis rotates
Processing method.
To achieve these goals, the technical solution used in the present invention is:
The processing method of a kind of spark machined hard metal article female thread, comprises the following steps:
S1. thread Pilot hole processing, processes thread Pilot hole on hard metal article；
S2. frock making, including making the electrode to hard metal article electric discharge and clamping hard metal article
Spiral clamping device, comprise the following steps that；
S21. electrode fabrication, first processes electrode matrix, then processes on electrode matrix and add with requirement
The hard metal article female thread tooth form of work, line number, rotation direction, pitch, big footpath, central diameter, path phase respectively
Same external screw thread, finally will cut on electrode matrix, until can fill at the bottom of the screw thread of hard metal article
Hole, retain radian is the flank of α simultaneously, α < π；
S22. spiral clamping device makes, including making screwed support member and revolving part, and clamping
The fixture of hard metal article, revolving part can mutually screw togather with support member, and both pitch, rotation direction are respectively
Identical with requiring the hard metal article female thread pitch of processing, rotation direction；
S3. frock is installed, and is arranged on the work platforms of spark-erosion machine tool by the support member of spiral clamping device,
Revolving part is screwed in support member by threaded portion, and fixture is arranged on revolving part end face, and guarantees fixture and rotation
The shaft center line turning part is parallel with work platforms；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 guarantees hard
The axial line of the thread Pilot hole of matter alloy product overlaps with the shaft center line of fixture；
S5. internal thread machining, electrode is sent in the thread Pilot hole of hard metal article, and is guaranteed by electric discharge machine
The longitudinal center line in electrode machining face and the axis parallel of thread Pilot hole, along the axial centre in electrode machining face
With the line direction in the axle center of thread Pilot hole, controlling electrode feed, electro-discharge machining, until electrode machining face
Stop during the axis coinciding of axial centre and thread Pilot hole, control electrode and translate along the opposite direction of feed, retreat to
Electrode puts into the position of thread Pilot hole for the first time, completes the processing of first paragraph female thread；Twisting revolving part so that
Revolving part rotation β angle, β is less than angle corresponding for α, the most again along axial centre and the screw thread in electrode machining face
The line direction in the axle center of bottom outlet, controls electrode feed, and electro-discharge machining, until in the axial direction in electrode machining face
Stop during the axis coinciding of the heart and thread Pilot hole, control electrode and translate along the opposite direction of feed, retreat at the beginning of electrode
The secondary position putting into thread Pilot hole, completes the processing of second segment female thread；According to aforesaid procedure of processing, depend on
Secondary twisting revolving part, feed, electro-discharge machining and withdrawing, until completing the whole female thread of hard metal article
Processing.
Preferably, in the manufacturing process of electrode, first process diameter and the hard metal article requiring processing
The pole shape electrode matrix that the big footpath of female thread is identical, then process on electrode matrix can with require processing
The external screw thread of hard metal article internal screw-thread screw, then along the axis of rotation of electrode matrix by electrode matrix
Cut into two halves, then along and orthogonal two symmetrical planes of facet and two symmetrical planes between
In the range of 4/3rds to five/5ths that distance is electrode matrix diameter, electrode matrix is cut, pars intermedia
Divide and be electrode.
Preferably, distance is electrode matrix diameter 3/4ths between two symmetrical planes.
Preferably, at the electrode being fabricated to, two 90 ° of corner angle is carried out 45 ° of chamferings.
Preferably, during internal thread machining, the angle beta that revolving part rotates every time is 92 °.
Preferably, during internal thread machining, effective working position of electric discharging machining electrode goes out head end and exceedes
Processed female thread bottom outlet goes out at least l pitch of head end.
The present invention also provides for the frock of a kind of spark machined hard metal article female thread, closes including to hard
The electrode of gold goods electric discharge and the spiral clamping device of clamping hard metal article；
Described electrode includes the electrode matrix that can fill in hard metal article thread Pilot hole, electrode matrix table
Face be provided with and require processing hard metal article female thread tooth form, line number, rotation direction, pitch, big footpath,
The external screw thread that central diameter, path are the most identical；
Described spiral clamping device includes support member and the revolving part mutually screwed togather by screw thread, and clamping
The fixture of hard metal article, revolving part and the pitch of support member, rotation direction respectively with require processing hard
Matter alloy product female thread pitch, rotation direction are identical, and fixture is arranged on the end of revolving part, and both rotations
Axial line conllinear.
Preferably, described fixture uses chuck or scroll chuck.
Preferably, the screw thread of support member is female thread, and the screw thread of revolving part is external screw thread, the spiral shell button of support member
No less than 12 button, the spiral shell button of revolving part no less than 10 button, and the spiral shell button of support member than revolving part spiral shell button extremely
Few many 2 buttons.
Preferably, described support member is additionally 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 rotated without Z axis, also can carry out the processing of hard alloy female thread.
2. the process principle of the present invention can elapse classification inner circle king bolt various to sintering cemented carbide goods
Groove is processed.
3. the process principle of the present invention can also be elapsed not processed and powder mixed dielectric EDM side by mill
The interior circular concave of various types of other sintering cemented carbide goods that formula solves is processed.
Accompanying drawing explanation
Fig. 1 be the present invention electrode fabrication during effective electric discharge position cross sectional representation.
Fig. 2 is the electrode structure schematic diagram of the present invention.
Fig. 3 is the spiral clamping device structural representation of the present invention.
Fig. 4 is the spiral clamping device full sectional view of the present invention.
Fig. 5 is the hard metal article female thread view to be processed of the present invention.
Fig. 6 is the hard metal article internal thread machining view of the present invention.
Labelling in figure: 1-support member, 2-revolving part, 3-fixture, 4-electrode, 5-hard metal article, 6-locks
Tight screw.
Detailed description of the invention
By following embodiment, technical scheme is further described.
Embodiment 1:
A kind of processing method of the spark machined hard metal article female thread of the present invention:
Hard alloy is: YG8
Product processing requires: product female thread specification is M8 right-handed thread, and the big footpath of M8 female thread tooth is 8mm,
The path of M8 female thread is 6.75mm, and central diameter is 7mm, and the path of 1/2nd is 3.375mm, spiral shell
Away from for 1.25mm, a length of 10mm of thread segment.
Procedure of processing is as follows:
S1. thread Pilot hole processing, processes the thread Pilot hole of a diameter of 6.75mm on hard metal article 5.
S2. frock making, including making the electrode 4 to hard metal article 5 electric discharge and clamping hard alloy
The spiral clamping device of goods 5, specifically comprises the following steps that
S21. electrode 4 makes, and with reference to Fig. 1, Fig. 2, first processes diameter and the hard alloy requiring processing
The pole shape electrode matrix (shown with reference to a part in Fig. 1) that the big footpath of goods 5 female thread is identical, then at electricity
Process on the matrix of pole can with require processing hard metal article 5 female thread tooth form, line number, rotation direction,
Pitch, big footpath, central diameter, path distinguish the most identical external screw thread (shown with reference to b part in Fig. 1), then edge
Electrode matrix is cut into two halves (with reference in Fig. 1 shown in c part) by the axis of rotation of electrode matrix, then along with
Distance between orthogonal two symmetrical planes of facet and two symmetrical planes is electrode matrix diameter
3/4ths, the symmetry of two symmetrical planes is 0.1, by electrode matrix cut, mid portion is electricity
Pole 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 being fabricated to, two 90 ° of corner angle carried out 45 ° of chamferings (with reference in Fig. 1 shown in e part),
So, the safe distance between electrode 4 and hard metal article 5 is bigger, and electric discharging machining electrode 4 is axial
Effectively a length of the 20 of working position.
S22. spiral clamping device makes, with reference to Fig. 3, Fig. 4, including making screwed support member 1 He
Revolving part 2, and the fixture 3 of clamping hard metal article 5, revolving part 2 can mutually screw togather with support member 1,
And both pitch, rotation direction are identical with requiring the hard metal article 5 female thread pitch of processing, rotation direction respectively.
S3. frock is installed, and is arranged on the work platforms of spark-erosion machine tool by the support member 1 of spiral clamping device,
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
Fixture 3 is parallel with work platforms with the shaft center line of revolving part 2；Electrode 4 is arranged on electric spark simultaneously
On machine.
S4. product clamping, will process hard metal article 5 clamping of thread Pilot hole on fixture 3, and really
The axial line of thread Pilot hole protecting 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 into hard metal article 5 by electric discharge machine
Thread Pilot hole in, 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 and exceedes processed female thread and go out 2 spiral shell buttons of head end；
Along axial centre and the line direction in the axle center of thread Pilot hole of electrode 4 machined surface, control electrode 4 feed,
Electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode 4 machined surface, controls
Electrode 4 translates along the opposite direction of feed, retreats to electrode 4 and puts into the position of thread Pilot hole for the first time, completes first
The processing of section female thread；Twisting revolving part 2 so that revolving part 2 rotation β angle, β=92 ° ± 1 °, the most again
Along axial centre and the line direction in the axle center of thread Pilot hole of electrode 4 machined surface, control electrode 4 feed,
Electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode 4 machined surface, controls
Electrode 4 translates along the opposite direction of feed, retreats to electrode 4 and puts into the position of thread Pilot hole for the first time, completes second
The processing of section female thread；According to aforesaid procedure of processing, successively twisting revolving part 2, feed, electro-discharge machining and
Withdrawing, until completing the processing of the whole female thread of hard metal article 5.
Anglec of rotation β is 92 ± 1 °, and the angle that the radian measure alpha of machined surface is corresponding is 97 ° 36 ', and anglec of rotation β ratio adds
The angle of the radian measure alpha in work face is little, and after having fully ensured that rotation, undressed position is all in spark machined electricity
In the coverage of pole 4, the mat woven of fine bamboo strips one is processed 97 ° 36 ' to add 3 times and is rotated minimum 91 ° × 3=273 ° equal to 370 °
36 ', exceed wholecircle 360 °, course of processing product rotates less 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 female thread of the present invention, including to hard alloy
The electrode 4 of goods 5 electric discharge and the spiral clamping device of clamping hard metal article 5.
Electrode 4 includes the electrode matrix that can fill in hard metal article 5 thread Pilot hole,
Electrode matrix surface configuration has and requires the hard metal article 5 female thread tooth form of processing, line number, rotation
To, pitch, big footpath, central diameter, external screw thread that path is the most identical, can fill in firmly in order to ensure electrode 5
In matter alloy product 5 thread Pilot hole, the radian in external screw thread face be the angle that α, α are corresponding be 97 ° 36 '.Meanwhile,
According to the processing request of hard metal article 5 female thread, the screw thread of the machined surface of electrode 5 selects tooth form to be three
Angle-style, line number is 1, and rotation direction is dextrorotation, and pitch is 1.25mm, and big footpath is 8mm, and central diameter is 7mm.
Spiral clamping device includes support member 1 and the revolving part 2 mutually screwed togather by screw thread, and clamping hard
The fixture 3 of alloy product 5, revolving part 2 and the pitch of both support members 1, rotation direction respectively with require processing
Hard metal article 5 female thread pitch, rotation direction identical, i.e. pitch is 1.25mm, and rotation direction is dextrorotation,
Fixture 3 is arranged on the end of revolving part 2, and both shaft center line conllinear, and fixture 3 uses four paws card
Dish.
The screw thread of support member 1 is female thread, and the screw thread of revolving part 2 is external screw thread, and the spiral shell button of support member 1 is
18 buttons, the spiral shell button of revolving part 2 is 15 buttons, and on support member, 1 is provided with the lock-screw 6 of locking revolving part 2,
After revolving part 2 rotates to the angle of regulation, by lock-screw 6, revolving part 2 can be locked.
Embodiment 2:
A kind of processing method of the spark machined hard metal article female thread of the present invention:
Hard alloy is: YN10
Product processing requires: product female thread specification is M10 left hand thread, and the big footpath of M10 female thread tooth is
The path of 10mm, M10 female thread is 8.376mm, and central diameter is 9.026mm, and the path of 1/2nd is
4.188mm, pitch is 1.5mm, a length of 22.5mm of thread segment.
Procedure of processing is as follows:
S1. thread Pilot hole processing, processes at the bottom of the screw thread of a diameter of 8.376mm on hard metal article 5
Hole.
S2. frock making, including making the electrode 4 to hard metal article 5 electric discharge and clamping hard alloy
The spiral clamping device of goods 5, specifically comprises the following steps that
S21. electrode 4 makes, and with reference to Fig. 1, Fig. 2, first processes diameter and the hard alloy requiring processing
The pole shape electrode matrix (shown with reference to a part in Fig. 1) that the big footpath of goods 5 female thread is identical, then at electricity
Process on the matrix of pole can with require processing hard metal article 5 female thread tooth form, line number, rotation direction,
Pitch, big footpath, central diameter, path distinguish the most identical external screw thread (shown with reference to b part in Fig. 1), then edge
Electrode matrix is cut into two halves (with reference in Fig. 1 shown in c part) by the axis of rotation of electrode matrix, then along with
Distance between orthogonal two symmetrical planes of facet and two symmetrical planes is electrode matrix diameter
3/5ths, the symmetry of two symmetrical planes is 0.1, by electrode matrix cut, mid portion is electricity
Pole 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 being fabricated to, two 90 ° of corner angle carried out 45 ° of chamferings (with reference in Fig. 1 shown in e part),
A length of the 25 of electric discharging machining electrode 4 the most effectively working position.
S22. spiral clamping device makes, with reference to Fig. 3, Fig. 4, including making screwed support member 1 He
Revolving part 2, and the fixture 3 of clamping hard metal article 5, revolving part 2 can mutually screw togather with support member 1,
And both pitch, rotation direction are identical with requiring the hard metal article 5 female thread pitch of processing, rotation direction respectively.
S3. frock is installed, and is arranged on the work platforms of spark-erosion machine tool by the support member 1 of spiral clamping device,
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
Fixture 3 is parallel with work platforms with the shaft center line of revolving part 2；Electrode 4 is arranged on electric spark simultaneously
On machine.
S4. product clamping, will process hard metal article 5 clamping of thread Pilot hole on fixture 3, and really
The axial line of thread Pilot hole protecting 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 into hard metal article 5 by electric discharge machine
Thread Pilot hole in, 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 and exceedes processed female thread and go out 2 spiral shell buttons of head end；
Along axial centre and the line direction in the axle center of thread Pilot hole of electrode 4 machined surface, control electrode 4 feed,
Electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode 4 machined surface, controls
Electrode 4 translates along the opposite direction of feed, retreats to electrode 4 and puts into the position of thread Pilot hole for the first time, completes first
The processing of section female thread；Twisting revolving part 2 so that revolving part 2 rotation β angle, β=70 ° ± 1 °, the most again
Along axial centre and the line direction in the axle center of thread Pilot hole of electrode 4 machined surface, control electrode 4 feed,
Electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode 4 machined surface, controls
Electrode 4 translates along the opposite direction of feed, retreats to electrode 4 and puts into the position of thread Pilot hole for the first time, completes second
The processing of section female thread；According to aforesaid procedure of processing, successively twisting revolving part 2, feed, electro-discharge machining and
Withdrawing, until completing the processing of the whole female thread of hard metal article 5.
Anglec of rotation β is 70 ± 1 °, and the angle that the radian measure alpha of machined surface is corresponding is 73 ° 44 ', and anglec of rotation β ratio adds
The angle that the radian measure alpha in work face is corresponding is little, and after having fully ensured that rotation, undressed position is all in electrical spark working
In work electrode 4 coverage, the mat woven of fine bamboo strips one is processed 73 ° 44 ' to add 5 times and is rotated minimum 70 ° × 5=350 ° etc.
In 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 female thread of the present invention, including to hard alloy
The electrode 4 of goods 5 electric discharge and the spiral clamping device of clamping hard metal article 5.
Electrode matrix surface configuration has and requires the hard metal article 5 female thread tooth form of processing, line number, rotation
To, pitch, big footpath, central diameter, external screw thread that path is the most identical, can fill in firmly in order to ensure electrode 5
In matter alloy product 5 thread Pilot hole, the radian in external screw thread face be the angle that α, α are corresponding be 73 ° 44 '.Meanwhile,
According to the processing request of hard metal article 5 female thread, the screw thread of the machined surface of electrode 4 selects tooth form to be three
Angle-style, line number is 1, and rotation direction is left-handed, and pitch is 1.5mm, and big footpath is 10mm, and central diameter is 9.026mm.
Spiral clamping device includes support member 1 and the revolving part 2 mutually screwed togather by screw thread, and clamping hard
The fixture 3 of alloy product 5, revolving part 2 and the pitch of both support members 1, rotation direction respectively with require processing
Hard metal article 5 female thread pitch, rotation direction identical, i.e. pitch is 1.5mm, and rotation direction is left-handed, folder
Tool 3 is arranged on the end of revolving part 2, and both shaft center line conllinear, and fixture 3 uses chuck.
The screw thread of support member 1 is female thread, and the screw thread of revolving part 2 is external screw thread, and the spiral shell button of support member 1 is
18 buttons, the spiral shell button of revolving part 2 is 15 buttons, and on support member, 1 is provided with the lock-screw 6 of locking revolving part 2,
After revolving part 2 rotates to the angle of regulation, by lock-screw 6, revolving part 2 can be locked.
Embodiment 3:
A kind of processing method of the spark machined hard metal article female thread of the present invention:
Hard alloy is: YG20C
Product processing requires: product female thread specification is M20 right-handed thread, and the big footpath of M20 female thread tooth is
The path of 20mm, M20 female thread is 17.294mm, and central diameter is 18.376mm, 1/2nd little
Footpath is 8.647mm, and pitch is 2.5mm, a length of 32.5mm of thread segment.
Procedure of processing is as follows:
S1. thread Pilot hole processing, processes at the bottom of the screw thread of a diameter of 17.294mm on hard metal article 5
Hole.
S2. frock making, including making the electrode 4 to hard metal article 5 electric discharge and clamping hard alloy
The spiral clamping device of goods 5, specifically comprises the following steps that
S21. electrode 4 makes, and with reference to Fig. 1, Fig. 2, first processes diameter and the hard alloy requiring processing
The pole shape electrode matrix (shown with reference to a part in Fig. 1) that the big footpath of goods 5 female thread is identical, then at electricity
Process on the matrix of pole can with require processing hard metal article 5 female thread tooth form, line number, rotation direction,
Pitch, big footpath, central diameter, path distinguish the most identical external screw thread (shown with reference to b part in Fig. 1), then edge
Electrode matrix is cut into two halves (with reference in Fig. 1 shown in c part) by the axis of rotation of electrode matrix, then along with
Distance between orthogonal two symmetrical planes of facet and two symmetrical planes is electrode matrix diameter
4/5ths, the symmetry of two symmetrical planes is 0.1, by electrode matrix cut, mid portion is electricity
Pole 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 being fabricated to, two 90 ° of corner angle carried out 45 ° of chamferings (with reference in Fig. 1 shown in e part),
A length of the 35 of electric discharging machining electrode 4 the most effectively working position.
S22. spiral clamping device makes, with reference to Fig. 3, Fig. 4, including making screwed support member 1 He
Revolving part 2, and the fixture 3 of clamping hard metal article 5, revolving part 2 can mutually screw togather with support member 1,
And both pitch, rotation direction are identical with requiring the hard metal article 5 female thread pitch of processing, rotation direction respectively.
S3. frock is installed, and is arranged on the work platforms of spark-erosion machine tool by the support member 1 of spiral clamping device,
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
Fixture 3 is parallel with work platforms with the shaft center line of revolving part 2；Electrode 4 is arranged on electric spark simultaneously
On machine.
S4. product clamping, will process hard metal article 5 clamping of thread Pilot hole on fixture 3, and really
The axial line of thread Pilot hole protecting 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 into hard metal article 5 by electric discharge machine
Thread Pilot hole in, 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 and exceedes processed female thread and go out 2 spiral shell buttons of head end；
Along axial centre and the line direction in the axle center of thread Pilot hole of electrode 4 machined surface, control electrode 4 feed,
Electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode 4 machined surface, controls
Electrode 4 translates along the opposite direction of feed, retreats to electrode 4 and puts into the position of thread Pilot hole for the first time, completes first
The processing of section female thread；Twisting revolving part 2 so that revolving part 2 rotation β angle, β=100 ° ± 1 °, then
Again along axial centre and the line direction in the axle center of thread Pilot hole of electrode 4 machined surface, control electrode 4 feed,
Electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode 4 machined surface, controls
Electrode 4 translates along the opposite direction of feed, retreats to electrode 4 and puts into the position of thread Pilot hole for the first time, completes second
The processing of section female thread；According to aforesaid procedure of processing, successively twisting revolving part 2, feed, electro-discharge machining and
Withdrawing, until completing the processing of the whole female thread of hard metal article 5.
Anglec of rotation β is 100 ± 1 °, and the angle that the radian measure alpha of machined surface is corresponding is 106 ° 16 ', anglec of rotation β
The angle more corresponding than the radian measure alpha of machined surface is little, and after having fully ensured that rotation, undressed position is all in electricity fire
In flower machined electrode 4 coverage, the mat woven of fine bamboo strips one is processed 106 ° 16 ' and is added 3 100 ° minimum × 3=of rotation
300 ° are equal to 406 ° 16 ', have exceeded 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 female thread of the present invention, including to hard alloy
The electrode 4 of goods 5 electric discharge and the spiral clamping device of clamping hard metal article 5.
Electrode matrix surface configuration has and requires the hard metal article 5 female thread tooth form of processing, line number, rotation
To, pitch, big footpath, central diameter, external screw thread that path is the most identical, can fill in firmly in order to ensure electrode 5
In matter alloy product 5 thread Pilot hole, the radian in external screw thread face be the angle that α, α are corresponding be 106 ° 16 '.Meanwhile,
According to the processing request of hard metal article 5 female thread, the screw thread of the machined surface of motor selects tooth form to be triangle
Type, line number is 1, and rotation direction is dextrorotation, and pitch is 2.5mm, and big footpath is 20mm, and central diameter is 18.376mm.
Spiral clamping device includes support member 1 and the revolving part 2 mutually screwed togather by screw thread, and clamping hard
The fixture 3 of alloy product 5, revolving part 2 and the pitch of both support members 1, rotation direction respectively with require processing
Hard metal article 5 female thread pitch, rotation direction identical, i.e. pitch is 2.5mm, and rotation direction is dextrorotation, folder
Tool 3 is arranged on the end of revolving part 2, and both shaft center line conllinear, and fixture 3 uses scroll chuck.
The screw thread of support member 1 is female thread, and the screw thread of revolving part 2 is external screw thread, and the spiral shell button of support member 1 is
18 buttons, the spiral shell button of revolving part 2 is 15 buttons, and on support member, 1 is provided with the lock-screw 6 of locking revolving part 2,
After revolving part 2 rotates to the angle of regulation, by lock-screw 6, revolving part 2 can be locked.
Claims (10)
1. the processing method of a spark machined hard metal article female thread, it is characterised in that comprise the following steps:
S1. thread Pilot hole processing, processes thread Pilot hole on hard metal article (5)；
S2. frock making, including making the electrode (4) and the spiral clamping device of clamping hard metal article (5) discharging hard metal article (5), specifically comprises the following steps that
S21. electrode (4) makes, first electrode matrix is processed, then process on electrode matrix and require hard metal article (5) the female thread tooth form of processing, line number, rotation direction, pitch, big footpath, central diameter, external screw thread that path difference is identical, finally will 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, including making screwed support member (1) and revolving part (2), and the fixture (3) of clamping hard metal article (5), revolving part (2) can mutually screw togather with support member (1), and both pitch, rotation direction are identical with requiring hard metal article (5) the female thread pitch of processing, rotation direction respectively；
S3. frock is installed, the support member (1) of spiral clamping device is arranged on the work platforms 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 work platforms with the shaft center line of revolving part (2)；Electrode (4) is arranged on electric discharge machine simultaneously；
S4. product clamping, hard metal article (5) clamping of thread Pilot hole will be processed on fixture (3), and guarantee that the axial line of 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, the line direction in axle center along axial centre and the thread Pilot hole of electrode (4) machined surface, control electrode (4) feed, electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode (4) machined surface, control the electrode (4) the opposite direction translation along feed, retreat to electrode (4) and put into the position of thread Pilot hole for the first time, complete the processing of first paragraph female thread；Twisting revolving part (2), make revolving part (2) rotation β angle, β is less than angle corresponding for α, the most again along the line direction in axle center of axial centre and thread Pilot hole of electrode (4) machined surface, control electrode (4) feed, electro-discharge machining, until stopping during the axis coinciding of axial centre and the thread Pilot hole of electrode (4) machined surface, control the electrode (4) the opposite direction translation along feed, retreat to electrode (4) and put into the position of thread Pilot hole for the first time, complete the processing of second segment female thread；According to aforesaid procedure of processing, twist revolving part (2), feed, electro-discharge machining and withdrawing successively, until completing the processing of the whole female thread of hard metal article (5).
Processing method the most 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 big footpath of hard metal article (5) female thread requiring processing is processed, then processing on electrode matrix can be with the external screw thread of hard metal article (5) internal screw-thread screw requiring processing, then electrode matrix is cut into two halves by the axis of rotation along electrode matrix, again along two symmetrical planes orthogonal with facet, and in the range of distance is electrode matrix diameter 4/3rds to five/5ths between two symmetrical planes, electrode matrix is cut, mid portion is electrode (4).
Processing method the most according to claim 2, it is characterised in that distance is electrode matrix diameter 3/4ths between two symmetrical planes.
Processing method the most according to claim 3, it is characterised in that two 90 ° of corner angle is carried out 45 ° of chamferings at the electrode (4) being fabricated to.
Processing method the most according to claim 3, it is characterised in that during internal thread machining, the angle beta that revolving part (2) rotates every time is 92 °.
Processing method the most according to claim 1, it is characterised in that during internal thread machining, effective working position of electric discharging machining electrode (4) goes out head end and exceedes processed female thread bottom outlet and go out at least l pitch of head end.
7. the frock of a spark machined hard metal article female thread, it is characterised in that include electrode (4) and the spiral clamping device of clamping hard metal article (5) that hard metal article (5) is discharged；
Described electrode (4) includes the electrode matrix that can fill in hard metal article (5) thread Pilot hole, and electrode matrix surface configuration has and requires hard metal article (5) the female thread tooth form of processing, line number, rotation direction, pitch, big footpath, central diameter, external screw thread that path difference is identical；
Described spiral clamping device includes support member (1) and the revolving part (2) mutually screwed togather by screw thread, and the fixture (3) of clamping hard metal article (5), revolving part (2) is identical with requiring hard metal article (5) the female thread pitch of processing, rotation direction respectively with support member (1) both pitch, rotation direction, fixture (3) is arranged on the end of revolving part (2), and both shaft center line conllinear.
The frock of spark machined hard metal article female thread the most according to claim 7, it is characterised in that described fixture (3) uses chuck or scroll chuck.
The frock of spark machined hard metal article female thread the most according to claim 7, it is characterized in that, the screw thread of support member (1) is female 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 spiral shell button 2 buttons more than the spiral shell button of revolving part (2) of support member (1).
The frock of spark machined hard metal article female thread the most according to claim 9, it is characterised in that described support member
(1)
On be additionally provided with locking revolving part (2) lock-screw (6).
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| CN105328284A (en) * | 2015-11-25 | 2016-02-17 | 天津航空机电有限公司 | Electrode for machining inner threads |
| CN105729199B (en) * | 2016-04-20 | 2018-09-28 | 西安鑫垚陶瓷复合材料有限公司 | A kind of inner mold face processing tool of ceramic matric composite revolving body |
| CN106392514A (en) * | 2016-10-31 | 2017-02-15 | 虎艺精密压铸（惠州）有限公司 | Mold threaded machining method |
| CN108112097B (en) * | 2017-12-18 | 2024-07-09 | 开封平煤新型炭材料科技有限公司 | Graphite electrode connection marking positioning method and device |
| CN109570659B (en) * | 2018-12-12 | 2020-04-28 | 杭州娃哈哈精密机械有限公司 | Electrode design method for electric spark machining of quenched steel threads |
| CN112756720B (en) * | 2020-12-31 | 2022-08-05 | 合肥工业大学 | Composite machining method suitable for threaded hole of hard alloy cutter bar |
| CN115722747A (en) * | 2022-12-07 | 2023-03-03 | 中国航发动力股份有限公司 | Device and method for machining external threads of outer ring of turbine |
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