CN112059559B - Joint ball seat turning and milling combined machining and inner spherical surface grinding method - Google Patents
Joint ball seat turning and milling combined machining and inner spherical surface grinding method Download PDFInfo
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- CN112059559B CN112059559B CN202010980551.4A CN202010980551A CN112059559B CN 112059559 B CN112059559 B CN 112059559B CN 202010980551 A CN202010980551 A CN 202010980551A CN 112059559 B CN112059559 B CN 112059559B
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- 238000000227 grinding Methods 0.000 title claims abstract description 110
- 238000003801 milling Methods 0.000 title claims abstract description 50
- 238000003754 machining Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 20
- 238000005121 nitriding Methods 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000010705 motor oil Substances 0.000 claims abstract description 5
- 238000011177 media preparation Methods 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 3
- 238000004040 coloring Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 6
- 206010023230 Joint stiffness Diseases 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 2
- 238000012797 qualification Methods 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 210000004907 gland Anatomy 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 229910001651 emery Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000003003 spiro group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D47/00—Equipment not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
A turning and milling combined machining and inner spherical surface grinding method for a joint ball seat comprises the following steps: step 1, clamping parts: installing an outer column of the joint ball seat part into an inner hole of a positioning ring of the clamp, matching an installation hole of the joint ball seat part with a positioning pin of the clamp, adjusting the position of a pressing plate, and pressing by using a pressing nut; step 2, turning and milling composite processing of the inner spherical surface and the groove: and step 3, nitriding treatment: the nitriding layer hardness value HR15N is more than or equal to 88, and the nitriding thickness is 0.2-0.45 mm; step 4, grinding medium preparation: carborundum with the granularity of 120 and 30# engine oil are adopted for blending, and the condition that no impurities exist in a grinding medium is ensured; and 5, grinding the inner spherical surface. By optimizing the positioning reference and the clamping mode of the inner spherical surface and the groove and adopting a turning and milling combined machining method, the problem of assembly interference between the joint ball seat part and the matched ball body is solved, mechanical auxiliary grinding is realized to replace manual grinding, the grinding efficiency and the qualification rate are improved, and the grinding difficulty and the workload are reduced.
Description
Technical Field
The invention belongs to the technical field of aero-engines, and particularly relates to a turning and milling combined machining and inner spherical surface grinding method for a joint ball seat.
Background
The joint ball seat is made of alloy structural steel, the blank is a die forging, and the structural body is a revolving body and is composed of a mounting hole, an inner spherical surface, a groove, an outer cylinder and the like, as shown in figure 1. The parts are assembled on an intermediary casing, are key connecting parts and force bearing parts of an engine, the main fitting surfaces are an inner spherical surface and an outer cylindrical surface, the inner spherical surface is matched with a sphere part, the fit clearance is about 0.01-0.03 mm, and the rotation is required during the work, so the requirement on the dimensional tolerance of the inner spherical surface is high, during the processing, the inner spherical surface is clamped and processed by a three-jaw chuck by a numerical control lathe, a groove is processed by a numerical control milling machine in a positioning way through a mounting hole, the processing is completed by clamping and positioning twice, but the processed inner spherical surface is asymmetrical to the center of the groove due to the deviation of the positioning twice, the interference exists between a joint ball seat and the sphere part during the assembly through the groove, the assembly qualification rate is only 70 percent, and meanwhile, because the parts are key force bearing connecting parts, the parts rotate relative to the matched sphere in a working state, the, the hardness of the spherical surface is high, the hardness value HR15N is not less than 88, the color adhesion of the inner spherical surface and a fitting part is required to be more than 85%, the roughness is Ra0.4, the inner spherical surface needs to be ground, but the spherical surface is in a semi-closed state through a part structure, the grinding only can be carried out by adopting a manual grinding method, the grinding efficiency and the qualification rate are low, the labor intensity is high, and the bottleneck problem limiting the production of parts is caused.
Disclosure of Invention
The invention aims to provide a turning and milling combined machining and inner spherical surface grinding method for a joint ball seat, which solves the problems of assembly interference between the joint ball seat and a matched ball body and inner spherical surface grinding, enables various technical indexes of the joint ball seat to meet the design and use requirements, improves the machining efficiency and the qualification rate, and reduces the labor intensity of workers.
In order to achieve the purpose, the invention adopts the following technical scheme:
a turning and milling combined machining and inner spherical surface grinding method for a joint ball seat comprises the following steps:
step 2.1, machining the spherical surface of the car and a milling groove through a turning and milling composite machining center, turning an inner spherical surface firstly, adopting a boring blade, performing rough turning and finish turning twice, performing rough turning firstly, wherein the rough turning rotating speed is 400-600 r/min, the feeding is 0.05-0.1 mm/r, and the allowance is left on one side after rough turning is 0.05-0.1 mm; then carrying out finish turning at the finish turning rotating speed of 600-1000 r/min and feeding at 0.03-0.05 mm/r;
2.2, after the spherical surface turning is finished, milling a groove by a power head of a turning and milling combined machining center, wherein the milling is divided into three steps of rough milling, semi-finish milling and finish milling, an end mill is selected, firstly, the groove is roughly milled, the rotating speed is 1600-2000 r/min, the feeding is 800-1000 mm/min, and a margin of 0.5-1 mm on one side is reserved; secondly, semi-finish milling a groove, feeding at a rotating speed of 2000-2500 r/min and a feeding speed of 800-1000 mm/min, and reserving a single side allowance of 0.1-0.15 mm; finish milling a groove, feeding at a rotating speed of 2200-2500 r/min and a feeding speed of 400-500 mm/min, ensuring the final size, and avoiding the cutter back-off problem caused by overlarge allowance, long cutter edge and small diameter;
and step 3, nitriding treatment: the nitriding layer hardness value HR15N is more than or equal to 88, and the nitriding thickness is 0.2-0.45 mm;
step 5.1, cleaning the surfaces of the parts and the grinding balls, and ensuring that no impurities or excess substances exist;
step 5.2, mounting the grinding ball on the joint ball seat part, and adjusting the axis of the inner conical surface of the grinding ball to be coaxial with the axis of the inner spherical surface of the joint ball seat part;
step 5.3, mounting the assembled grinding balls on a conical spindle of a grinding table, and pressing the grinding balls on the conical spindle by using a gasket and a nut;
step 5.4, starting the motor, and adjusting the rotating speed of the motor to 40-60 r/min;
step 5.5, adding a grinding medium along the gap between the grinding ball and the inner spherical surface of the joint ball seat part to grind the spherical surface; during grinding, grinding balls rotate around an axis along with a motor, the joint ball seat part is rotated by manual swing, relative motion is generated between the joint ball seat part and the outer spherical surface of the grinding balls, a crossed network track is formed, the inner spherical surface protrusion position of the part is removed through friction of a grinding medium in the middle, the grinding target is reached, the average grinding can remove the allowance of 0.004-0.006 mm every 10min, and the total grinding allowance is 0.02-0.05 mm;
and 5.6, cleaning the parts of the joint ball seat after grinding, performing the inner spherical surface joint tightness coloring inspection, and repeating the steps 5.1 to 5.6 when the coloring is unqualified until the joint tightness coloring inspection is qualified.
Anchor clamps include gland nut, clamp plate, joint ball seat part, locating pin, holding ring and base, base upper surface border is provided with the clamp plate along circumference, and clamp plate one end is passed through the stud and is linked to each other with the base, has seted up the slot hole on the clamp plate, is provided with the screw rod of bottom mounting on the base in the slot hole, and the screw rod top stretches out the holding plate part and is provided with gland nut, base upper surface center department is provided with the recess, has the holding ring through the bolt spiro union in the recess, has placed joint ball seat part in the hole of holding ring, and the mounting hole of joint ball seat part and the locating pin cooperation location on the holding ring, and joint ball seat.
The grinding table comprises grinding balls, a conical mandrel, nuts, gaskets, a tray, a workbench surface and a motor, the motor is fixedly mounted on the lower surface of the workbench surface, the tray is arranged on the upper surface of the workbench surface, a motor output shaft sequentially penetrates through the workbench surface and the tray, the tail end of the motor output shaft is connected with one end of the conical mandrel, the grinding balls are sleeved on the outer side surface of the conical mandrel, joint ball seat parts are sleeved on the outer side surface of the grinding balls, the nuts are screwed on the conical mandrel on the upper surface of the grinding balls, and the gaskets are arranged between the nuts and the upper.
The invention has the beneficial effects that:
1. by optimizing the positioning reference and the clamping mode of the inner spherical surface and the groove and adopting a turning and milling combined machining method, the problem of assembly interference between the joint ball seat part and the matched ball body is solved, mechanical auxiliary grinding is realized to replace manual grinding, the grinding efficiency and the qualification rate are improved, and the grinding difficulty and the workload are reduced.
2. The method of the invention is used for completing the turning and milling compound processing of the inner spherical surface and the profiled groove of the joint ball seat part, solves the problem that the inner spherical surface and the profiled groove of the joint ball seat part are not coaxial, improves the assembly qualification rate of the joint ball seat part and a matched ball body by more than 30 percent, improves the processing efficiency of the part by more than 30 percent, and reduces the repair cost; the grinding table is used for assisting in grinding, the grinding method of the inner spherical part is improved, the bottleneck problem of grinding of the inner spherical surface is solved, the service performance requirement of the part is met, the grinding efficiency of the inner spherical surface is improved by more than 80%, the one-time grinding qualified rate is improved by 50%, meanwhile, the labor intensity of operators is greatly reduced, and the production cost is greatly saved.
Drawings
FIG. 1 is a schematic view of a polishing table according to the present invention;
FIG. 2 is a cross-sectional view of the spherical turning and milling groove fixture of the present invention;
FIG. 3 is a top view of the ball turning and groove milling fixture of the present invention;
FIG. 4 is a cross-sectional view of the configuration of the articulating ball seat component of the invention;
FIG. 5 is a top view of the configuration of the articulating ball seat component of the invention;
FIG. 6 is a cross-sectional view of the structure of the grinding ball of the present invention;
FIG. 7 is a top view of the structure of the grinding ball of the present invention;
FIG. 8 is a sectional view showing the relative movement of the grinding balls and the ball seat component of the present invention;
FIG. 9 is a top view of the relative movement of the grinding balls and the ball seat component of the present invention;
1-compression nut, 2-pressure plate, 3-joint ball seat part, 4-positioning pin, 5-positioning ring, 6-base, 7-stud, 8-grinding ball, 9-conical mandrel, 10-nut, 11-gasket, 12-tray, 13-table surface, 14-motor, 15-mounting hole, 16-type groove, 17-internal spherical surface, 18-internal conical surface, 19-external spherical surface.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The joint ball seat part is made of alloy structural steel, the diameter of the outermost side of the joint ball seat part is phi 120mm, and the size of the inner spherical surface 17 is as follows: the spherical surface tolerance of S phi 55mm is 0.015-0.046 mm, the roughness of the inner spherical surface 17 is Ra0.4um, the thickness of the part is 30mm, the width of the profiled groove 16 is 28mm, the tolerance is 0.1mm, the length of the profiled groove 16 is 55mm, and the radius of the transfer fillet of the profiled groove 16 is R2.5mm.
As shown in fig. 1 to 9, a turning and milling combined machining and inner spherical surface grinding method for an articulated ball seat comprises the following steps:
step 2.1, machining the spherical surface of the car and a milling groove through a turning and milling composite machining center, firstly turning the inner spherical surface 17, adopting a boring blade, performing rough turning and finish turning twice, firstly performing rough turning, wherein the rough turning rotating speed is 500r/min, the feeding is 0.06mm/r, and the allowance is 0.05mm left on one side after rough turning; then carrying out finish turning processing, wherein the finish turning rotating speed is 800r/min, and the feeding is 0.04 mm/r;
step 2.2, after the spherical surface turning is finished, milling a groove 16 by a power head of a turning and milling composite machining center, wherein the milling comprises three steps of rough milling, semi-finish milling and finish milling, firstly, roughly milling the groove 16, selecting a hard alloy end mill with the diameter of phi 12, feeding the hard alloy end mill at the speed of 1600r/min for 1000mm/min, and reserving a margin of 0.5mm on one side; secondly, semi-finish milling a groove 16, selecting a hard alloy end mill with the diameter of 8mm, feeding the hard alloy end mill at the rotating speed of 2000r/min for 1000mm/min, and reserving a single side with the allowance of 0.1 mm; finish milling the profiled groove 16, choose the carbide end mill of phi 5, the rotational speed is 2500r/min, feed 500mm/min, guarantee the final size, avoid the surplus is too big, the knife edge length is longer, the diameter is smaller causes the cutter relieving problem, use the clamping location of once in the milling composite machining center to finish the processing of internal sphere 17 and profiled groove 16, guarantee the axis of internal sphere 17 and 16 axis of profiled groove coincide;
and step 3, nitriding treatment: the nitriding layer hardness value HR15N is more than or equal to 88, and the nitriding thickness is 0.2-0.45 mm;
step 5.1, cleaning the parts and the surface of the grinding ball 8, and ensuring that no impurities or excess substances exist;
step 5.2, mounting the grinding ball 8 on the joint ball seat part 3, and adjusting the axis of the inner conical surface of the grinding ball 8 to be coaxial with the axis of the inner spherical surface 17 of the joint ball seat part 3;
step 5.3, mounting the assembled grinding balls 8 on a conical spindle 9 of a grinding table, and pressing the grinding balls 8 on the conical spindle 9 by using a gasket 11 and a nut 10;
step 5.4, starting the motor 14, and adjusting the rotating speed of the motor 14 to 40 r/min;
step 5.5, adding a grinding medium along a gap between the grinding ball 8 and the inner spherical surface 17 of the joint ball seat part 3 to grind the surface of the grinding ball 8; during grinding, the grinding ball 8 rotates around an axis along with the motor 14, the joint ball seat part 3 is rotated by manual swing, relative motion is generated between the joint ball seat part 3 and the outer spherical surface of the grinding ball 8, a crossed network track is formed, the protruding position of the inner spherical surface 17 of the part is removed through friction of a grinding medium in the middle, the grinding target is reached, the removal allowance is 0.005mm every 10min during average grinding, and the total grinding allowance is 0.02-0.05 mm;
and 5.6, cleaning the joint ball seat part 3 after grinding, performing the joint sealing degree coloring check on the inner spherical surface 17, and repeating the steps 5.1 to 5.6 when the coloring is unqualified until the joint sealing degree coloring check is qualified.
Anchor clamps include gland nut 1, clamp plate 2, joint ball seat part 3, locating pin 4, holding ring 5 and base 6, 6 upper surface borders of base are provided with clamp plate 2 along circumference, and 2 one ends of clamp plate are passed through stud 7 and are linked to each other with base 6, have seted up the slot hole on the clamp plate 2, are provided with the screw rod of bottom mounting on base 6 in the slot hole, and the screw rod top is stretched out clamp plate 2 parts and is provided with gland nut 1, 6 upper surface center departments of base are provided with the recess, have holding ring 5 through the bolt spiro union in the recess, have placed joint ball seat part 3 in the hole of holding ring 5, and the mounting hole 15 of joint ball seat part 3 and 4 cooperation location of locating pin on the holding ring 5, and 3 upper surfaces of joint ball seat.
The grinding table comprises grinding balls 8, a conical mandrel 9, a nut 10, a gasket 11, a tray 12, a working table surface 13 and a motor 14, wherein the motor 14 is fixedly arranged on the lower surface of the working table surface 13, the tray 12 is arranged on the upper surface of the working table surface 13, an output shaft of the motor 14 sequentially penetrates through the working table surface 13 and the tray 12, the tail end of the output shaft is connected with one end of the conical mandrel 9, the grinding balls 8 are sleeved on the outer side surface of the conical mandrel 9, a joint ball seat part 3 is sleeved on the outer circular surface of each grinding ball 8, the nut 10 is screwed on the conical mandrel 9 on the upper surface of each grinding ball 8, the gasket 11 is arranged between the nut 10 and the upper surface of each grinding ball 8, the motor 14 serves as a power output device and drives the conical mandrel 9 and the grinding balls 8 to rotate around the axial direction, the joint ball seat part 3 swings in a reciprocating mode in a direction vertical to the conical mandrel 9, the swing angle is-, the cross-network grinding track is realized.
Claims (1)
1. A joint ball seat turning and milling combined machining and inner spherical surface grinding method is characterized by comprising the following steps:
step 1, clamping parts: installing an outer column of the joint ball seat part into an inner hole of a positioning ring of the clamp, matching an installation hole of the joint ball seat part with a positioning pin of the clamp, adjusting the position of a pressing plate, and pressing by using a pressing nut;
the fixture comprises a compression nut, a pressing plate, a joint ball seat part, a positioning pin, a positioning ring and a base, wherein the pressing plate is arranged on the edge of the upper surface of the base along the circumferential direction, one end of the pressing plate is connected with the base through a stud, a long hole is formed in the pressing plate, a screw rod with the bottom end fixed on the base is arranged in the long hole, the compression nut is arranged on the part, extending out of the pressing plate, of the top end of the screw rod, a groove is formed in the center of the upper surface of the base, the positioning ring is connected in the groove through a bolt in a threaded manner, the joint ball seat part is arranged in an inner hole of the positioning;
step 2, turning and milling composite processing of the inner spherical surface and the groove:
step 2.1, machining the spherical surface of the car and a milling groove through a turning and milling composite machining center, turning an inner spherical surface firstly, adopting a boring blade, performing rough turning and finish turning twice, performing rough turning firstly, wherein the rough turning rotating speed is 400-600 r/min, the feeding is 0.05-0.1 mm/r, and the allowance is left on one side after rough turning is 0.05-0.1 mm; then carrying out finish turning at the finish turning rotating speed of 600-1000 r/min and feeding at 0.03-0.05 mm/r;
2.2, after the spherical surface turning is finished, milling a groove by a power head of a turning and milling combined machining center, wherein the milling is divided into three steps of rough milling, semi-finish milling and finish milling, an end mill is selected, firstly, the groove is roughly milled, the rotating speed is 1600-2000 r/min, the feeding is 800-1000 mm/min, and a margin of 0.5-1 mm on one side is reserved; secondly, semi-finish milling a groove, feeding at a rotating speed of 2000-2500 r/min and a feeding speed of 800-1000 mm/min, and reserving a single side allowance of 0.1-0.15 mm; finely milling a groove, feeding at a rotating speed of 2200-2500 r/min and a feeding speed of 400-500 mm/min to ensure the final size;
and step 3, nitriding treatment: the nitriding layer hardness value HR15N is more than or equal to 88, and the nitriding thickness is 0.2-0.45 mm;
step 4, grinding medium preparation: carborundum and engine oil are adopted for blending, and the grinding medium is ensured to be free of impurities;
step 5, grinding the inner spherical surface:
step 5.1, cleaning the surfaces of the parts and the grinding balls, and ensuring that no impurities or excess substances exist;
step 5.2, mounting the grinding ball on the joint ball seat part, and adjusting the axis of the inner conical surface of the grinding ball to be coaxial with the axis of the inner spherical surface of the joint ball seat part;
step 5.3, mounting the assembled grinding balls on a conical spindle of a grinding table, and pressing the grinding balls on the conical spindle by using a gasket and a nut;
the grinding table comprises grinding balls, a conical mandrel, nuts, gaskets, a tray, a working table top and a motor, wherein the motor is fixedly mounted on the lower surface of the working table top, the tray is arranged on the upper surface of the working table top, an output shaft of the motor sequentially penetrates through the working table top and the tray, the tail end of the output shaft of the motor is connected with one end of the conical mandrel, the grinding balls are sleeved on the outer side surface of the conical mandrel, a joint ball seat part is sleeved on the outer side surface of each grinding ball, the nuts are screwed on the conical mandrel on the upper surface of each grinding ball, and;
step 5.4, starting the motor, and adjusting the rotating speed of the motor to 40-60 r/min;
step 5.5, adding a grinding medium along the gap between the grinding ball and the inner spherical surface of the joint ball seat part to grind the spherical surface; during grinding, grinding balls rotate around an axis along with a motor, the joint ball seat part is rotated by manual swing, relative motion is generated between the joint ball seat part and the outer spherical surface of the grinding balls, a crossed network track is formed, the inner spherical surface protrusion position of the part is removed through friction of a grinding medium in the middle, the grinding target is reached, the average grinding can remove the allowance of 0.004-0.006 mm every 10min, and the total grinding allowance is 0.02-0.05 mm;
and 5.6, cleaning the parts of the joint ball seat after grinding, then performing the internal spherical surface joint tightness coloring inspection, and repeating the steps 5.1 to 5.6 when the coloring is unqualified until the joint tightness coloring inspection is qualified.
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| CN115139061B (en) * | 2022-07-14 | 2024-03-08 | 昆山育源精密机械制造有限公司 | Intelligent control, adjustment and positioning processing method for automobile air conditioner compressor cylinder body |
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| DE102017112106A1 (en) * | 2016-06-06 | 2017-12-07 | Jtekt Corporation | EQUALIZED JOINT AND METHOD FOR THE PRODUCTION THEREOF |
| CN111421236A (en) * | 2020-04-29 | 2020-07-17 | 沈阳建筑大学 | Micro-textured self-lubricating ball joint with ceramic coating and preparation method thereof |
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| US4625377A (en) * | 1983-12-20 | 1986-12-02 | Kavthekar Keshav S | Method for manufacturing universal joints |
| CN101809306B (en) * | 2007-09-26 | 2013-12-18 | Ntn株式会社 | Fixed constant velocity universal joint |
| CN102152074B (en) * | 2011-03-14 | 2013-03-20 | 沈阳飞机工业（集团）有限公司 | Processing method of seamless joint of aluminum alloy |
| CN102284844B (en) * | 2011-08-19 | 2013-04-10 | 沈阳航天新乐有限责任公司 | Technological method for machining universal joint and tooling thereof |
| WO2015141021A1 (en) * | 2014-03-19 | 2015-09-24 | 日本精工株式会社 | Angular ball bearing |
| CN104948572A (en) * | 2015-06-17 | 2015-09-30 | 哈尔滨工业大学 | Joint ball bearing and processing method thereof |
| CN110977357B (en) * | 2019-12-25 | 2020-09-04 | 台州浩尔工业有限公司 | Bell-shaped shell for universal joint and processing technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102017112106A1 (en) * | 2016-06-06 | 2017-12-07 | Jtekt Corporation | EQUALIZED JOINT AND METHOD FOR THE PRODUCTION THEREOF |
| CN111421236A (en) * | 2020-04-29 | 2020-07-17 | 沈阳建筑大学 | Micro-textured self-lubricating ball joint with ceramic coating and preparation method thereof |
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