CN102151920B - Electrical discharge machining (EDM) method of super-hard micro-hemisphere couple part - Google Patents
Electrical discharge machining (EDM) method of super-hard micro-hemisphere couple part Download PDFInfo
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Abstract
The invention provides an electrical discharge machining (EDM) method of a super-hard micro-hemisphere couple part, and relates to a machining method of a super-hard micro-hemisphere couple part, which is used for solving the problems of high requirements on a machine tool, severe wear on a grinding wheel and long machining time in the existing grinding method for roughly machining the super-hard micro-hemisphere couple part. The EDM method comprises the following steps: a concave spherical surface electrode and a convex spherical surface electrode are respectively designed; a first conducting copper bar is fixedly connected with a hemispherical workpiece with a convex spherical surface, the concave spherical surface electrode is clamped and fixed with two first V-shaped blocks and then is immersed in an operating fluid, the hemispherical workpiece with a convex spherical surface is connected to the positive electrode of a power supply, the concave spherical surface electrode is connected to the negative electrode of the power supply, and the hemispherical workpiece with a convex spherical surface moves to be contacted with the concave spherical surface electrode for EDM until the hemispherical workpiece with a convex spherical surface is machined into a target machining size; and the machining method of a hemispherical workpiece with a concave spherical surface is as the same as that of the hemispherical workpiece with a convex spherical surface, wherein, the hemispherical workpiece with a concave spherical surface is clamped and fixed with two second V-shaped blocks. The EDM method is used for machining the super-hard micro-hemisphere couple part on a high-precision dynamic pressure air bearing.
Description
Technical field
The present invention relates to a kind of processing method of superhard small hemisphere idol part.
Background technology
The small hemisphere idol part that is used for hydrodynamic bearing adopts a kind of novel light Hardmetal materials, and it has high hardness (its HRC reaches 92～93), and high to the form accuracy and the dimension precision requirement of small hemisphere idol part.What the roughing of present small hemisphere idol part was generally adopted is grinding processing method, and on the one hand in order to keep form accuracy, this method is to require high (promptly high to the rotating accuracy of workpiece spindle and grinding wheel spindle, each guide rail linearity requirement) of lathe; The wearing and tearing of emery wheel are also relatively more serious on the other hand, and process consuming timely, caused great restriction for small applying of part of hemisphere idol.
Summary of the invention
The electric discharge machining method that the purpose of this invention is to provide a kind of superhard small hemisphere idol part, with solve at present superhard small hemisphere idol part adopt method for grinding carry out roughing exist high to the lathe requirement, abrasion of grinding wheel is serious, the problem of long processing time.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: a kind of electric discharge machining method of superhard small hemisphere idol part; Said superhard small hemisphere idol part comprises two workpiece; Said two workpiece are respectively protruding sphere hemisphere workpiece and concave spherical surface hemisphere workpiece, and the hardness HRC of said superhard small hemisphere idol part is 92～93; Said electric discharge machining method is accomplished by following steps:
Step 1: design two electrodes; Two electrodes are respectively concave spherical surface electrode and protruding radius tip electrode;
To protruding sphere hemisphere workpiece, design concave spherical surface electrode, the concave spherical surface diameter of concave spherical surface electrode is than big 40～50 μ m of target processing diameter of protruding sphere hemisphere workpiece, and the concave spherical surface error of concave spherical surface electrode is 10～20 μ m;
To concave spherical surface hemisphere workpiece, design protruding radius tip electrode, the protruding spherical diameter of protruding radius tip electrode is than little 40～50 μ m of target processing diameter of concave spherical surface hemisphere workpiece, and the protruding spherical surface error of protruding radius tip electrode is 10～20 μ m;
Step 2: the installation of workpiece and electrode; At first design two conduction copper rods, two conduction copper rods are respectively the first conduction copper rod and the second conduction copper rod, and the first conduction copper rod is made up of small diameter cylinders body and the large diameter cylinder of processing one, and the second conduction copper rod is a cylinder;
The small diameter cylinders body of the first conduction copper rod matches with the central through hole of protruding sphere hemisphere workpiece; The first conduction copper rod is connected with protruding sphere hemisphere workpiece; With the concave spherical surface electrode clamping in two first vee-blocks; Two first vee-blocks are fixed on the workbench; One end of the large diameter cylinder of the first conduction copper rod is connected on the movable up and down connecting axle, guarantee that the axiality of concave spherical surface electrode and protruding sphere hemisphere workpiece is controlled in the 5 μ m, and the distance between the minimum point of the last plane of concave spherical surface electrode and protruding sphere hemisphere workpiece is controlled between 4.5～5.5cm;
Smear electric silica gel on the second conduction copper rod lower surface; The lower surface of the second conduction copper rod is fixedly connected with the center of protruding radius tip electrode planar end through electric silica gel; With concave spherical surface hemisphere clamping workpiece in two second vee-blocks; Two second vee-blocks are fixed on the workbench; The upper end of the second conduction copper rod is connected on the movable up and down connecting axle, guarantee that the axiality of protruding radius tip electrode and concave spherical surface hemisphere workpiece is controlled in the 5 μ m, and the distance between the minimum point of the last plane of concave spherical surface hemisphere workpiece and protruding radius tip electrode is controlled between 4.5～5.5cm;
Step 3: the spark machined of protruding sphere hemisphere workpiece; Earlier the concave spherical surface electrode is immersed in the working solution; Then protruding sphere hemisphere workpiece is connect the positive pole of power supply, the concave spherical surface electrode is connect the negative pole of power supply, protruding sphere hemisphere workpiece setting in motion; Contact the beginning edm with the concave spherical surface electrode; Discharge parameter is respectively: peak point current is that 19～20A, pulsewidth are that 45～50 μ s, inter-train pause are 90～100 μ s, and each working depth is set is 0.05mm, until being worked into the target processing dimension by protruding sphere hemisphere workpiece;
The spark machined of concave spherical surface hemisphere workpiece; Earlier concave spherical surface hemisphere workpiece is immersed in the working solution; Then concave spherical surface hemisphere workpiece is connect the positive pole of power supply, protruding radius tip electrode is connect the negative pole of power supply, protruding radius tip electrode setting in motion; Contact the beginning edm with concave spherical surface hemisphere workpiece; Discharge parameter is respectively: peak point current is that 19～20A, pulsewidth are that 45～50 μ s, inter-train pause are 90～100 μ s, and each working depth is set is 0.05mm, until this concave spherical surface hemisphere workpiece is worked into the target processing dimension.
The invention has the beneficial effects as follows: the galvano-cautery phenomenon when spark machined is based on pulse feature spark discharge between workpiece and the electrode (connecing the positive and negative electrode of power supply) is lost and is removed unnecessary metal, to reach the processing request that the size shape of workpiece and surface quality are scheduled to.Electric spark can be processed any conductive material, because active force is very little in the process, so spark machined is not limited by workpiece material hardness, and requires lower to the strength and stiffness of electrode.Because workpiece material is a conductive material, the hardness that just can avoid material with spark machined limits, and in the short time, realizes the removal of big surplus.The present invention can not only improve the quick removal of even part material greatly, guarantees form accuracy, and also not high to the requirement of lathe; Simultaneously can also improve working (machining) efficiency, cut down finished cost.The present invention not only can obtain satisfied process velocity (0.1mm/hour), less export license (carbon black in the working solution has slowed down export license attached to electrode surface); Workpiece can also obtain surface accuracy preferably simultaneously, and surface figure accuracy peak-to-valley value (PV value) is about 2 μ m, and the roughness of finished surface is about 0.6 μ m.
Description of drawings
Fig. 1 is the main cutaway view of protruding sphere hemisphere workpiece 1; Fig. 2 is the vertical view of Fig. 1, and Fig. 3 is the main cutaway view of concave spherical surface hemisphere workpiece 2, and Fig. 4 is the vertical view of Fig. 3; Fig. 5 is the main cutaway view of protruding radius tip electrode 4; Fig. 6 is the vertical view of Fig. 5, and Fig. 7 is the main cutaway view of concave spherical surface electrode 3, and Fig. 8 is the vertical view of Fig. 7; Fig. 9 is the fixedly vertical view of clamping of concave spherical surface electrode 3 and two first vee-blocks 6; Figure 10 is the fixedly vertical view of clamping of concave spherical surface hemisphere workpiece 2 and two second vee-blocks 8, and Figure 11 is the main cutaway view of filled conductive silica gel 7 between the planar end of shoulder end face and protruding sphere hemisphere workpiece 1 of the first conduction copper rod 5, and Figure 12 is that the main cutaway view that electric silica gel 7 is fixedly connected with the center of protruding radius tip electrode 4 planar ends is passed through in the lower surface of the second conduction copper rod 9.
The specific embodiment
The specific embodiment one: combine Fig. 1～Figure 12 explanation; The electric discharge machining method of the superhard small hemisphere idol part of this embodiment; Said superhard small hemisphere idol part comprises two workpiece; Said two workpiece are respectively protruding sphere hemisphere workpiece 1 and concave spherical surface hemisphere workpiece 2, and the hardness HRC of said superhard small hemisphere idol part is 92～93; Said electric discharge machining method is accomplished by following steps:
Step 1: design two electrodes and (in order to obtain required dimensional accuracy, form accuracy and high working (machining) efficiency, in spark machined, need do the design of science, machining process is controlled to electrode.The size of electrode will directly influence the final machining shape of workpiece, and technical process is determining working (machining) efficiency and machined surface quality); Two electrodes are respectively concave spherical surface electrode 3 and protruding radius tip electrode 4;
To protruding sphere hemisphere workpiece 1; Design concave spherical surface electrode 3; The concave spherical surface diameter of concave spherical surface electrode 3 is than big 40～50 μ m of target processing diameter of protruding sphere hemisphere workpiece 1; The concave spherical surface error of concave spherical surface electrode 3 is that (the electrode size design on the one hand will be according to the size of workpiece, and the preprocessing target size is confirmed for 10～20 μ m; Confirm according to the loss of electrode on the other hand);
To concave spherical surface hemisphere workpiece 2; Design protruding radius tip electrode 4; The protruding spherical diameter of protruding radius tip electrode 4 is than little 40～50 μ m of target processing diameter of concave spherical surface hemisphere workpiece 2; The protruding spherical surface error of protruding radius tip electrode 4 is that (the electrode size design on the one hand will be according to the size of workpiece, and the preprocessing target size is confirmed for 10～20 μ m; Confirm according to the loss of electrode on the other hand);
Step 2: the installation of workpiece and electrode; At first design two conduction copper rods, two conduction copper rods are respectively that the first conduction copper rod 5 and the second conduction copper rod, 9, the first conduction copper rods 5 are made up of small diameter cylinders body 5-1 that processes one and large diameter cylinder 5-2, and the second conduction copper rod 9 is a cylinder;
The small diameter cylinders body 5-1 of the first conduction copper rod 5 matches with the central through hole 1-1 of protruding sphere hemisphere workpiece 1; The first conduction copper rod 5 is connected with protruding sphere hemisphere workpiece 1; With concave spherical surface electrode 3 clampings in two first vee-blocks 6; Two first vee-blocks 6 are fixed on the workbench and (when clamping with same plane face as a reference, guarantee separately the flatness with respect to the plane of reference; Simultaneously in order to guarantee the axiality of workpiece and electrode; Utilize the contact perceptional function of lathe; The workpiece that clamping is good and electrode on the horizontal plane along about contact perception with fore-and-aft direction; Get its intermediate point adjustment location of workpiece, guarantee axiality each other), the end of the large diameter cylinder 5-2 of the first conduction copper rod 5 is connected on the movable up and down connecting axle; The axiality that guarantees concave spherical surface electrode 3 and protruding sphere hemisphere workpiece 1 is controlled in the 5 μ m, and the distance between the minimum point of the last plane of concave spherical surface electrode 3 and protruding sphere hemisphere workpiece 1 is controlled between 4.5～5.5cm;
The second conduction copper rod is smeared electric silica gel 7 on 9 lower surfaces; The lower surface of the second conduction copper rod 9 is fixedly connected with the center of protruding radius tip electrode 4 planar ends through electric silica gel 7; With concave spherical surface hemisphere workpiece 2 clampings in two second vee-blocks 8; Two second vee-blocks 8 are fixed on the workbench and (when clamping with same plane face as a reference, guarantee separately the flatness with respect to the plane of reference; Simultaneously in order to guarantee the axiality of workpiece and electrode; Utilize the contact perceptional function of lathe; The workpiece that clamping is good and electrode on the horizontal plane along about contact perception with fore-and-aft direction; Get its intermediate point adjustment location of workpiece, guarantee axiality each other), the upper end of the second conduction copper rod 9 is connected on the movable up and down connecting axle; The axiality that guarantees protruding radius tip electrode 4 and concave spherical surface hemisphere workpiece 2 is controlled in the 5 μ m, and the distance between the minimum point of the last plane of concave spherical surface hemisphere workpiece 2 and protruding radius tip electrode 4 is controlled between 4.5～5.5cm;
Step 3: the spark machined of protruding sphere hemisphere workpiece; Earlier concave spherical surface electrode 3 is immersed in the working solution; Then protruding sphere hemisphere workpiece 1 is connect the positive pole of power supply; Concave spherical surface electrode 3 is connect the negative pole of power supply, and protruding sphere hemisphere workpiece 1 setting in motion contacts the beginning edm and (will observe discharge scenario at any time in the process with concave spherical surface electrode 3; Judge whether discharge is even; The relative position of fine setting workpiece and electrode is to guarantee that discharge is evenly), discharge parameter is respectively: peak point current is that 19～20A, pulsewidth are that 45～50 μ s, inter-train pause are that (power parameter plays great role to the quality of process and processing result to 90～100 μ s; Peak point current, pulsewidth and inter-train pause are determining process velocity, peak point current and the loss of pulsewidth determining electrode; Simultaneously pulsewidth is also determining the workpiece surface quality quality), and each working depth is set is 0.05mm, until being worked into the target processing dimension by protruding sphere hemisphere workpiece 1;
The spark machined of concave spherical surface hemisphere workpiece; Earlier concave spherical surface hemisphere workpiece 2 is immersed in the working solution; Then concave spherical surface hemisphere workpiece 2 is connect the positive pole of power supply; Protruding radius tip electrode 4 is connect the negative pole of power supply, and protruding radius tip electrode 4 setting in motions contact the beginning edm and (will observe discharge scenario at any time in the process with concave spherical surface hemisphere workpiece 2; Judge whether discharge is even; The relative position of fine setting workpiece and electrode is to guarantee that discharge is evenly), discharge parameter is respectively: peak point current is that 19～20A, pulsewidth are that 45～50 μ s, inter-train pause are that (power parameter plays great role to the quality of process and processing result to 90～100 μ s; Peak point current, pulsewidth and inter-train pause are determining process velocity, peak point current and the loss of pulsewidth determining electrode; Simultaneously pulsewidth is also determining the workpiece surface quality quality), and each working depth is set is 0.05mm, until this concave spherical surface hemisphere workpiece 2 is worked into the target processing dimension.
In this embodiment, consider wear to electrodes, the electrode that do three same sizes is processed same workpiece (if i.e. processing concave spherical surface hemisphere workpiece needs three protruding radius tip electrodes 4 of processing; If process protruding sphere hemisphere workpiece, need three concave spherical surface electrodes 3 of processing), change use according to the abrasion condition of electrode.
The specific embodiment two: combine Fig. 9 and Figure 10 explanation, the concave spherical surface diameter of the concave spherical surface electrode 3 in the step 1 of this embodiment is than the big 50 μ m of target processing diameter of protruding sphere hemisphere workpiece 1, and the concave spherical surface error of concave spherical surface electrode 3 is 20 μ m; The protruding spherical diameter of protruding radius tip electrode 4 is than the little 50 μ m of target processing diameter of concave spherical surface hemisphere workpiece 2, and the protruding spherical surface error of protruding radius tip electrode 4 is 20 μ m.Workpiece can obtain surface accuracy preferably, and surface figure accuracy peak-to-valley value (PV value) is about 2 μ m, and the roughness of finished surface is about 0.6 μ m.Other is identical with the specific embodiment one.
The specific embodiment three: combine Fig. 9 and Figure 10 explanation, step 3 convexity sphere hemisphere workpiece 1 setting in motion of this embodiment, the peak point current that contacts the beginning edm with concave spherical surface electrode 3 is that 20A, pulsewidth are that 50 μ s, inter-train pause are 100 μ s; Protruding radius tip electrode 4 setting in motions, the peak point current that contacts the beginning edm with concave spherical surface hemisphere workpiece 2 is that 20A, pulsewidth are that 50 μ s, inter-train pause are 100 μ s.Workpiece can obtain surface accuracy preferably, and surface figure accuracy peak-to-valley value (PV value) is about 2 μ m, and the roughness of finished surface is about 0.6 μ m.Other is identical with the specific embodiment one or two.
The specific embodiment four: the working solution in the step 3 of this embodiment is a kerosene.Other is identical with the specific embodiment one.
The specific embodiment five: combine Fig. 9 and Figure 11 explanation; In the step 2 of this embodiment; With before concave spherical surface electrode 3 clampings are in two first vee-blocks 6, filled conductive silica gel 7 between the planar end of the shoulder end face of the first conduction copper rod 5 and protruding sphere hemisphere workpiece 1.The first conduction copper rod 5 is connected reliably with protruding sphere hemisphere workpiece 1.Other is identical with the specific embodiment one.
Claims (5)
1. the electric discharge machining method of a superhard small hemisphere idol part; Said superhard small hemisphere idol part comprises two workpiece; Said two workpiece are respectively protruding sphere hemisphere workpiece (1) and concave spherical surface hemisphere workpiece (2), and the hardness HRC of said superhard small hemisphere idol part is 92～93; It is characterized in that: said electric discharge machining method is accomplished by following steps:
Step 1: design two electrodes; Two electrodes are respectively concave spherical surface electrode (3) and protruding radius tip electrode (4);
To protruding sphere hemisphere workpiece (1), design concave spherical surface electrode (3), the concave spherical surface diameter of concave spherical surface electrode (3) is than big 40～50 μ m of target processing diameter of protruding sphere hemisphere workpiece (1), and the concave spherical surface error of concave spherical surface electrode (3) is 10～20 μ m;
To concave spherical surface hemisphere workpiece (2), design protruding radius tip electrode (4), the protruding spherical diameter of protruding radius tip electrode (4) is than little 40～50 μ m of target processing diameter of concave spherical surface hemisphere workpiece (2), and the protruding spherical surface error of protruding radius tip electrode (4) is 10～20 μ m;
Step 2: the installation of workpiece and electrode; At first design two conduction copper rods; Two conduction copper rods are respectively the first conduction copper rod (5) and the second conduction copper rod (9); The first conduction copper rod (5) is made up of the small diameter cylinders body (5-1) of processing one and large diameter cylinder (5-2), and the second conduction copper rod (9) is a cylinder;
The small diameter cylinders body (5-1) of the first conduction copper rod (5) matches with the central through hole (1-1) of protruding sphere hemisphere workpiece (1); The first conduction copper rod (5) is connected with protruding sphere hemisphere workpiece (1); With concave spherical surface electrode (3) clamping in two first vee-blocks (6); Two first vee-blocks (6) are fixed on the workbench; One end of the large diameter cylinder (5-2) of the first conduction copper rod (5) is connected on the movable up and down connecting axle, guarantee that the axiality of concave spherical surface electrode (3) and protruding sphere hemisphere workpiece (1) is controlled in the 5 μ m, and the distance between the minimum point of the last plane of concave spherical surface electrode (3) and protruding sphere hemisphere workpiece (1) is controlled between 4.5～5.5cm;
Smear electric silica gel (7) on second conduction copper rod (9) lower surface; The lower surface of the second conduction copper rod (9) is fixedly connected with the center of protruding radius tip electrode (4) planar end through electric silica gel (7); With concave spherical surface hemisphere workpiece (2) clamping in two second vee-blocks (8); Two second vee-blocks (8) are fixed on the workbench; The upper end of the second conduction copper rod (9) is connected on the movable up and down connecting axle, guarantee that the axiality of protruding radius tip electrode (4) and concave spherical surface hemisphere workpiece (2) is controlled in the 5 μ m, and the distance between the minimum point of the last plane of concave spherical surface hemisphere workpiece (2) and protruding radius tip electrode (4) is controlled between 4.5～5.5cm;
Step 3: the spark machined of protruding sphere hemisphere workpiece; Earlier concave spherical surface electrode (3) is immersed in the working solution; Then protruding sphere hemisphere workpiece (1) is connect the positive pole of power supply; Concave spherical surface electrode (3) is connect the negative pole of power supply; Protruding sphere hemisphere workpiece (1) setting in motion contacts the beginning edm with concave spherical surface electrode (3), discharge parameter is respectively: peak point current is that 19～20A, pulsewidth are that 45～50 μ s, inter-train pause are 90～100 μ s; And each working depth is set is 0.05mm, until being worked into the target processing dimension by protruding sphere hemisphere workpiece (1);
The spark machined of concave spherical surface hemisphere workpiece; Earlier concave spherical surface hemisphere workpiece (2) is immersed in the working solution; Then concave spherical surface hemisphere workpiece (2) is connect the positive pole of power supply; Protruding radius tip electrode (4) is connect the negative pole of power supply; Protruding radius tip electrode (4) setting in motion contacts the beginning edm with concave spherical surface hemisphere workpiece (2), discharge parameter is respectively: peak point current is that 19～20A, pulsewidth are that 45～50 μ s, inter-train pause are 90～100 μ s; And each working depth is set is 0.05mm, until this concave spherical surface hemisphere workpiece (2) is worked into the target processing dimension.
2. the electric discharge machining method of a kind of superhard small hemisphere idol part according to claim 1; It is characterized in that: the concave spherical surface diameter of the concave spherical surface electrode (3) in the step 1 is than the big 50 μ m of target processing diameter of protruding sphere hemisphere workpiece (1), and the concave spherical surface error of concave spherical surface electrode (3) is 20 μ m; The protruding spherical diameter of protruding radius tip electrode (4) is than the little 50 μ m of target processing diameter of concave spherical surface hemisphere workpiece (2), and the protruding spherical surface error of protruding radius tip electrode (4) is 20 μ m.
3. the electric discharge machining method of a kind of superhard small hemisphere idol part according to claim 1 and 2; It is characterized in that: step 3 convexity sphere hemisphere workpiece (1) setting in motion, the peak point current that contacts the beginning edm with concave spherical surface electrode (3) is that 20A, pulsewidth are that 50 μ s, inter-train pause are 100 μ s; Protruding radius tip electrode (4) setting in motion, the peak point current that contacts the beginning edm with concave spherical surface hemisphere workpiece (2) is that 20A, pulsewidth are that 50 μ s, inter-train pause are 100 μ s.
4. the electric discharge machining method of a kind of superhard small hemisphere idol part according to claim 1, it is characterized in that: the working solution in the step 3 is a kerosene.
5. the electric discharge machining method of a kind of superhard small hemisphere idol part according to claim 1; It is characterized in that: in the step 2; The small diameter cylinders body and the large diameter cylinder joint portion of processing one are formed with the shoulder end face; With before concave spherical surface electrode (3) clamping is in two first vee-blocks (6), filled conductive silica gel (7) between the planar end of the shoulder end face of the first conduction copper rod (5) and protruding sphere hemisphere workpiece (1).
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| RU2639201C1 (en) * | 2016-06-20 | 2017-12-20 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Tool-electrode for electrical discharge machining of spherical surfaces |
| CN106270837B (en) * | 2016-09-20 | 2019-04-23 | 哈尔滨工业大学深圳研究生院 | It is a kind of to utilize liquid metals electro-discharge machining spherical shape cavity plate method |
| RU2653041C1 (en) * | 2017-08-03 | 2018-05-04 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Method of electroerosive machining |
| CN114367712B (en) * | 2021-11-15 | 2023-02-28 | 山西江淮重工有限责任公司 | Machining device and machining method for nonmetal parts with hemispherical inner and outer surfaces |
| CN116786920B (en) * | 2023-08-28 | 2023-11-28 | 赫比(成都)精密塑胶制品有限公司 | Electric spark machining method and machining equipment |
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| EP0573900A1 (en) * | 1992-06-08 | 1993-12-15 | Sumitomo Rubber Industries Limited | Method for manufacturing master of die for shaping golf ball |
| CN1088141A (en) * | 1992-12-16 | 1994-06-22 | 国营江南光学仪器厂 | Spark machined precision plane and sphere new technology |
| US6410877B1 (en) * | 2000-01-30 | 2002-06-25 | Diamicron, Inc. | Methods for shaping and finishing prosthetic joint components including polycrystalline diamond compacts |
| CN101856800A (en) * | 2010-05-10 | 2010-10-13 | 北京兴华机械厂 | Electrolytic in-process dressing device of concave spherical surface of spherical coupling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0573900A1 (en) * | 1992-06-08 | 1993-12-15 | Sumitomo Rubber Industries Limited | Method for manufacturing master of die for shaping golf ball |
| CN1088141A (en) * | 1992-12-16 | 1994-06-22 | 国营江南光学仪器厂 | Spark machined precision plane and sphere new technology |
| US6410877B1 (en) * | 2000-01-30 | 2002-06-25 | Diamicron, Inc. | Methods for shaping and finishing prosthetic joint components including polycrystalline diamond compacts |
| CN101856800A (en) * | 2010-05-10 | 2010-10-13 | 北京兴华机械厂 | Electrolytic in-process dressing device of concave spherical surface of spherical coupling |
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