CN115284171B - Cross head pin grinding device and method adopting adjustable center - Google Patents
Cross head pin grinding device and method adopting adjustable center Download PDFInfo
- Publication number
- CN115284171B CN115284171B CN202210792102.6A CN202210792102A CN115284171B CN 115284171 B CN115284171 B CN 115284171B CN 202210792102 A CN202210792102 A CN 202210792102A CN 115284171 B CN115284171 B CN 115284171B
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- cross pin
- grinding
- adjusting
- wedge strip
- center
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
- B24B5/04—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces externally
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
A cross pin grinding device and method adopting an adjustable center comprises a balance insert, an adjusting gasket, two transmission rods and two adjustable center components; the method comprises the steps of installing an adjusting gasket and a balance insert with proper thickness on a notch surface of a cross pin from bottom to top, enabling the arc surface of the balance insert to be slightly higher than the outer circle of the cross pin, respectively connecting a transmission rod in a lifting hole of the cross pin, respectively installing an adjustable center assembly on a main shaft and a tailstock of a grinding machine, clamping the cross pin on the grinding machine in a double-center mode, inserting the transmission rod into a groove of a chuck, enabling the cross pin to be connected with the main shaft in a double-rod transmission mode and synchronously rotating, rotating an adjusting screw, enabling the adjustable center assembly to expand in a center hole of the cross pin, and grinding the outer circle of the cross pin. The invention solves the balance problem of the stress of the workpiece and the running of the grinding wheel, has the advantages of convenient and safe operation, achieves the effects of reducing the cost and improving the production efficiency and the machining precision, and is suitable for the grinding machining of the cross pin of the large diesel engine.
Description
Technical Field
The invention relates to processing of marine diesel engine parts, in particular to a cross pin grinding device and method adopting an adjustable center, and belongs to the technical field of machining.
Background
The cross pin is one of important moving parts of a high-power low-speed marine diesel engine, referring to fig. 1, 2 and 3, the cross pin 8 is a stepped cylinder, a large cylinder is provided with a notch, the notch surface 81 is parallel to the axis of the cross pin 8, symmetrically distributed screw holes 83 are arranged on the notch surface, and lifting holes 82 symmetrically distributed in the diameter direction are arranged on the end surface of a small cylinder. The machining requirements of the roughness and cylindricity of the outer circle of the cross pin 8 are relatively high, the roughness of the outer circle is Ra0.05, and the cylindricity is generally required to be within 0.02mm, so that the requirement on grinding precision is particularly high.
At present, the grinding processing of the cross pin 8 on the grinding machine generally adopts a double-center mode, a workpiece is clamped by using a conventional center, a balance insert is arranged on a notch surface 81 of the workpiece through a screw hole 83, and the workpiece is driven to rotate through a single transmission rod connected to the transmission screw hole 82, so that the grinding is realized. However, grinding cross pins using this method has the following drawbacks and disadvantages: the single transmission rod can cause uneven stress on the workpiece, particularly when the transmission rod is positioned at the upper position, the workpiece is pulled away from the grinding wheel, and when the transmission rod is positioned at the lower position, the workpiece is pulled towards the grinding wheel, so that the workpiece cylindricity is out of tolerance; the repeated use of the balance insert can cause serious abrasion, the arc surface of the balance insert is lower than the outer circle of the workpiece after a period of time, the grinding wheel can idle when grinding to a notch, the grinding force is intermittent and unbalanced, and therefore the cylindricity of the notch area is out of tolerance; in addition, the double-center clamping mode has high requirements on the roundness of the center hole of the cross pin 84, the center hole is required to be polished from time to time in the grinding process, the precision requirement on a machine tool for polishing the center hole is also high, and the requirement can be met only by polishing the center hole for a plurality of times, so that frequent polishing of the center hole can cause repeated turning on and off of a workpiece, the production efficiency is reduced, and the production order is disturbed.
Disclosure of Invention
The invention aims to provide a cross pin grinding device and method adopting an adjustable center, which solve the problem of out-of-flatness of the cross pin caused by unbalanced stress of a workpiece, unbalanced grinding of a grinding wheel, out-of-round center holes and the like in the process of grinding the outer circle of the cross pin, and achieve the effects of improving the production efficiency and the grinding precision.
Based on the above purpose, the technical scheme adopted by the invention is as follows:
the cross pin grinding device with the adjustable tip is arranged on a grinding machine and is connected with the cross pin, the grinding machine comprises a main shaft, a chuck and a tailstock, taper holes are formed in the main shaft and the tailstock, grooves are formed in the chuck, a notch surface is formed in the cross pin, two lifting holes which are symmetrically arranged are formed in the end face of the cross pin, the cross pin grinding device comprises a balance insert, the balance insert is connected onto the notch surface, the lower part of the balance insert is a plane with the same shape and size as the notch surface, and the upper part of the balance insert is an arc surface with the same radius as the outer circle of the cross pin; the cross pin grinding device is characterized by further comprising an adjusting gasket, two transmission rods and two adjustable center assemblies;
the adjusting gasket is clamped between the balance insert and the notch surface of the cross pin and is used for adjusting the height of the balance insert, one end of the transmission rod is connected with the lifting hole of the cross pin through threads, the other end of the transmission rod is inserted into the groove of the chuck, the cross pin is driven to rotate in a double-rod transmission mode, the two adjustable center components are respectively connected with the main shaft and the tailstock, and the cross pin is clamped on the grinding machine in a double-center mode;
the adjustable center assembly comprises a center body and four groups of rib assemblies, wherein the front part of the center body is a conical surface, four long waist grooves are distributed along the circumference of the conical surface in a cross shape, four groups of rib assemblies are respectively embedded in the four long waist grooves, each rib assembly comprises a compensation rib plate, an adjusting wedge strip and an adjusting screw, the adjusting wedge strip is arranged at the bottom of the long waist groove and can longitudinally move in the long waist groove, the upper part of the adjusting wedge strip is a longitudinal inclined surface, the compensation rib plate is embedded in the long waist groove and is positioned above the adjusting wedge strip, the upper part of the adjusting wedge strip is an arc surface, the lower part of the compensating wedge strip is a longitudinal inclined surface, the inclined surface is in contact with the inclined surface of the upper part of the adjusting wedge strip, the compensation rib plate and the adjusting wedge strip are fixed in the long waist groove through fixing screws, the adjusting screws are rotatably connected with the top ends of the adjusting wedge strip, the adjusting wedge strip can be driven to longitudinally move in the long waist groove and the four opposite to each other through the inclined surfaces of the adjusting wedge strip, and the positions of the four wedge strip are adjusted in the opposite to each other through the four wedge strip, and the positions of the four wedge strip are adjusted by the opposite to each groove.
Further, the thickness of the adjusting gasket is adjusted to adjust the height of the arc surface of the balancing insert, so that the arc surface is tightly connected with the outer circle of the cross pin, and the grinding at the notch of the cross pin is uninterrupted, so that the balance of grinding force is achieved.
Further, the width of the adjusting wedge strip and the compensating rib plate is equal to the width of the long waist groove.
Further, the adjusting wedge strip is provided with a plurality of waist-shaped through holes which are penetrated up and down so as to adapt to the movement adjustment of the adjusting wedge strip.
The other technical scheme of the invention is as follows:
the cross pin grinding method adopting the adjustable tip is realized by the cross pin grinding device, and is characterized in that an adjusting gasket and a balance insert with proper thickness are arranged on a notch surface of the cross pin from bottom to top, so that the arc surface of the balance insert is slightly higher than the outer circle of the cross pin, simultaneously, two lifting holes are respectively connected with a transmission rod, then, the taper holes of a main shaft and a tail seat of a grinding machine are respectively provided with an adjustable tip assembly, the cross pin is clamped on the grinding machine in a double-tip mode, the end parts of the two transmission rods are inserted into grooves of a chuck, the cross pin is connected with the main shaft in a double-rod transmission mode and synchronously rotates, then, four adjusting screws of the rib assemblies are rotated, so that the rib assemblies are expanded in the tip holes of the cross pin, and finally, the outer circle of the cross pin is ground by the grinding wheel.
Further, the cross pin grinding method comprises the following specific steps:
1) Placing an adjusting gasket with proper height on the notch surface of the cross pin, installing the balance insert on the adjusting gasket, and fixing the adjusting gasket and the balance insert on the notch surface of the cross pin through screws so that the arc surface of the balance insert is higher than the excircle of the cross pin;
2) A transmission rod is screwed into two lifting holes on the end face of the cross pin respectively;
3) Respectively loading an adjustable center assembly into taper holes of a main shaft and a tailstock of the grinding machine, and unscrewing a fixing screw of the rib assembly;
4) Clamping the cross pin on the grinding machine in a double-center mode, inserting the end parts of two transmission rods into grooves of the chuck, and realizing transmission connection of the cross pin and a main shaft in a double-rod transmission mode;
5) The adjusting screw is rotated, so that four rib assemblies on the adjustable center assembly are tightly tensioned in the center hole of the cross pin, and the position of the cross pin is adjusted;
6) And starting the grinding machine to grind the outer circle of the cross pin, so as to meet the requirement of ensuring cylindricity.
Further, the step 6) further includes: if the tip hole of the cross pin is found to be deformed in the grinding process, the step 5) is executed to adjust the position of the cross pin so as to avoid out-of-tolerance in roundness and run-out caused by out-of-round of the tip hole.
Compared with the prior art, the invention has the beneficial effects that:
1. the production efficiency is improved, the labor intensity of operation is reduced, and because the adjustable center assembly is used, the rib assembly can be tightly tensioned in the center hole of the cross pin through the adjusting screw, the purpose of quickly fine-adjusting the position of the workpiece is achieved, so that repeated center hole repair is avoided, and the upper and lower vehicles do not need to be repeated.
2. The product quality is improved, namely the position height of the balance insert is adjusted by using the adjusting gasket, so that the grinding wheel is always contacted with the surface of the workpiece, the grinding force of the grinding wheel is ensured to be stable, and the cylindricity of a notch area is avoided from being out of tolerance.
3. The workpiece is stressed uniformly, so that the safety is improved, the workpiece is driven to move by adopting the double transmission rods, the workpiece is rotated stably, and the out-of-tolerance of the cylindricity of the cross pin is prevented.
4. The operation is safe, convenient and quick.
In conclusion, the invention effectively solves the balance problem of the stress of the workpiece and the running of the grinding wheel, has the advantages of convenient and safe operation, achieves the effects of reducing the cost and improving the production efficiency and the machining precision, and can be suitable for grinding the cross pin of the large diesel engine.
Drawings
Fig. 1 is a schematic view of the structure of a cross pin.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a top view of fig. 1.
Fig. 4 is a schematic structural view of an adjustable center assembly.
Fig. 5 is a schematic view of the tip body.
Fig. 6 is a left side view of fig. 5.
Fig. 7 is a schematic structural view of the rib assembly.
Fig. 8 is a schematic structural view of the actuator rod.
Fig. 9 is a left side view of fig. 8.
Fig. 10 is a schematic view of an adjustment shim.
Fig. 11 is a schematic view of a balance insert.
Fig. 12 is a top view of fig. 11.
Fig. 13 is a state of use of the present invention.
In the figure: 1-chuck, 2-adjustable center assembly, 3-compensating rib plate, 4-rib assembly, 5-adjusting screw, 6-center body, 61-conical surface, 62-taper shank, 63-long waist groove, 7-adjusting wedge strip, 8-cross head pin, 81-notch surface, 82-lifting hole, 83-screw hole, 9-tailstock, 10-driving rod, 11-fixing screw, 12-waist-shaped through hole, 13-adjusting gasket, 14-balancing insert, 15-through hole and 16-connecting through hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, which should not be construed as limiting the scope of the invention.
The invention is used for grinding the excircle of the cross pin of the diesel engine, referring to fig. 1, 2 and 3, the big cylinder of the cross pin 8 is provided with notches, the notch surface 81 of the big cylinder is provided with symmetrically distributed screw holes 83, and the end surface of the small cylinder is provided with two lifting holes 82.
Referring to fig. 13, the cross pin grinding apparatus is mounted on a grinding machine, which includes a spindle, a chuck 1, and a tailstock 9; the cross pin grinding device comprises a balance insert 14, an adjusting gasket 13, two transmission rods 10 and two adjustable center assemblies 2, wherein the two adjustable center assemblies 2 are tightly expanded in center holes at two ends of a cross pin 8 in a double-center supporting mode, one adjustable center assembly 2 is connected with a main shaft of a grinding machine, the other adjustable center assembly 2 is connected with a tailstock 9, one end of each transmission rod 10 is connected with a lifting hole 82 of the cross pin 8 through threads, the other end of each transmission rod 10 is inserted into a groove of a chuck 1 of the grinding machine, the balance insert 14 is connected to a notch surface 81 of the cross pin 8 through screws, and the adjusting gasket 13 is clamped between the balance insert 14 and the notch surface 81.
Referring to fig. 4, the adjustable center assembly 2 includes a center body 6 and four sets of rib assemblies 4. Referring to fig. 5 and 6 in combination, the front part of the tip body 6 is a conical surface 61, the rear part is a taper shank 62, four long waist grooves 63 are distributed on the conical surface 61 in a cross shape along the circumference, and screw holes for connecting the rib assemblies 4 are arranged in the long waist grooves 63. Referring to fig. 7, each rib assembly 4 includes a compensating rib plate 3, an adjusting wedge strip 7 and an adjusting screw 5. The adjusting wedge strip 7 is a strip rod, is placed at the bottom of the long waist groove 63 and can slide longitudinally in the long waist groove 63, the adjusting wedge strip 7 is equal in width with the long waist groove 63, the upper portion of the adjusting wedge strip is a longitudinal inclined plane, and a plurality of waist-shaped through holes 12 penetrating up and down are formed in the adjusting wedge strip 7 and are used for penetrating through the fixing screws 11. The compensating rib plate 3 is a wedge-shaped long bar member, the upper part is an arc surface, the lower part is a longitudinal inclined plane, and the direction of the inclined angle is opposite to that of the upper part of the adjusting wedge bar 7; the compensation rib plate 3 is embedded in the long waist groove 63 and is positioned above the adjusting wedge strip 7, the inclined surface at the lower part of the compensation rib plate is in face-to-face contact with the inclined surface at the upper part of the adjusting wedge strip 7, and the circular arc surface at the upper part is connected with the conical surface 61 of the center body 6; the compensating rib plate 3 is provided with a plurality of connecting through holes, the fixing screws 11 penetrate through the connecting through holes and the kidney-shaped through holes 12 of the adjusting wedge strips 7 to be connected with screw holes at the bottom of the long kidney grooves 63, and the compensating rib plate 3 and the adjusting wedge strips 7 are fixed in the long kidney grooves 63. The adjusting screw 5 is screwed on the top body 6 at the end part of the long waist groove 63 and is connected with the top end of the adjusting wedge strip 7, the adjusting screw 5 is rotated to drive the adjusting wedge strip 7 to longitudinally move in the long waist groove 63, the height position of the compensating rib plate 3 in the long waist groove 63 can be adjusted through the action of opposite inclined planes on the adjusting wedge strip 7 and the compensating rib plate 3, so that four groups of rib assemblies 4 can be tightly expanded in top holes at two ends of the cross head pin 8, the arc surface at the upper part of the compensating rib plate 3 is guaranteed to be in constant tight contact with the top holes, and the workpiece position is finely adjusted, so that the fact that the top holes need to be repaired at intervals in the grinding process, and the reduction of production efficiency is caused by the fact that the workpiece is reversely driven down is avoided.
Referring to fig. 8 and 9 in combination, one end of the driving rod 10 is a threaded section connected to the lifting hole 82 of the cross pin 8, and the other end is a rod end inserted into the groove of the grinder chuck 1. The rotation of the chuck 1 of the grinding machine drives the cross pin 8 to do rotary motion through the two transmission rods 10, so that the problem of uneven stress caused by the use of a single transmission rod is solved.
Referring to fig. 11 and 12 in combination, the balance insert 14 is a small semi-cylinder, the lower part is a plane with the same shape and size as the notch surface 81 of the cross pin 8, and the upper part is an arc surface with the same radius as the outer circle of the cross pin 8; the balance insert 14 is provided with a connecting through hole 16 for passing a screw, and the position of the connecting through hole 16 is the same as that of the screw hole 83 of the notch surface 81 of the cross pin 8.
Referring to fig. 10, the adjusting washer 13 is a flat plate, the shape and size of the adjusting washer are the same as those of the notch surface 81 of the cross pin 8, the adjusting washer 13 is provided with a through hole 15, and the through hole 15 is used for passing through a screw, and the position of the through hole is the same as that of the screw hole 83 of the notch surface 81 of the cross pin 8. The thickness of the adjusting gasket 13 can be adjusted to adjust the height of the arc surface of the balancing insert 14, and the adjusting gasket is tightly connected with the outer circle of the cross pin 8, so that the grinding wheel can still be in a grinding state when the grinding is carried out to the notch, and the problem of unbalanced grinding force caused by idle running is avoided.
The cross pin grinding method adopting the adjustable tip comprises the following steps:
referring to fig. 13, the balance insert 14 is installed at the notch of the cross pin 8, an adjusting washer 13 with proper thickness is installed between the balance insert 14 and the notch surface 81, the arc surface of the balance insert 14 is slightly higher than the outer circle of the workpiece of the cross pin 8, meanwhile, one ends of the transmission rod 10 are respectively and fixedly connected in two lifting holes 82 on the end surface of the cross pin 8, then the adjustable center assembly 2 is installed in taper holes of a main shaft of a grinding machine and a tailstock 9, the cross pin 8 is installed on a machine tool in a double-center clamping mode, the other end of the transmission rod 10 is inserted into a groove of the chuck 1, the cross pin 8 is connected with the main shaft of the grinding machine and synchronously rotates, then four adjusting screws 5 of the adjustable center assembly 2 are rotated, and finally, four uniformly distributed rib assemblies 4 on the conical surface 61 are tightly expanded in the tip holes of the cross pin 8, and finally, the outer circle of the cross pin 8 is ground by axial reciprocating movement and radial rotation of the cross pin 8.
The cross pin grinding method comprises the following specific steps:
1) When the cross pin 8 is ground in a double-center mode, a balance insert 14 is arranged at a notch of the cross pin 8, and an adjusting gasket 13 with proper height is arranged between the balance insert 14 and a notch surface 81 of the cross pin 8, so that the arc surface of the balance insert 14 is higher than the outer circle of the cross pin 8;
2) The transmission rod 10 is respectively installed in two lifting holes 82 on the end face of the cross pin 8;
3) The adjustable center assembly 2 is respectively arranged in taper holes of a machine tool spindle and a tailstock 9, and a fixing screw 11 of a rib assembly 4 on the adjustable center assembly 2 is unscrewed for one circle;
4) The double-center clamping method is adopted to mount the cross pin 8 on a machine tool, and the end part of the transmission rod 10 is inserted into a groove of the chuck 1 to realize transmission connection of the cross pin 10 and a main shaft;
5) Adjusting the adjusting screw 5 on the rib assembly 4 to enable four uniformly distributed rib assemblies 4 on the conical surface 61 of the adjustable center assembly 2 to be tensioned in the center hole of the cross head pin 8 so as to calibrate the position of the workpiece; if the deformation of the center hole is found in the grinding process, the position of the workpiece is adjusted by rotating the adjusting screw 5, so that the out-of-tolerance of roundness and jump of the workpiece caused by out-of-round center hole in the grinding process is avoided;
6) Starting a main shaft of a grinding machine and a grinding wheel, and grinding the outer circle of the cross pin 8 through the grinding wheel so as to achieve the aim of ensuring cylindricity.
The invention effectively solves the balance problem of the stress of the cross pin workpiece and the rotation of the grinding wheel, avoids repeated loading and unloading, greatly improves the working efficiency and the processing precision, simultaneously has simple and convenient actual operation, effectively reduces the labor intensity, improves the production efficiency and reduces the cost.
Claims (7)
1. The cross pin grinding device with the adjustable tip is arranged on a grinding machine and is connected with the cross pin, the grinding machine comprises a main shaft, a chuck and a tailstock, taper holes are formed in the main shaft and the tailstock, grooves are formed in the chuck, a notch surface is formed in the cross pin, two lifting holes which are symmetrically arranged are formed in the end face of the cross pin, the cross pin grinding device comprises a balance insert, the balance insert is connected onto the notch surface, the lower part of the balance insert is a plane with the same shape and size as the notch surface, and the upper part of the balance insert is an arc surface with the same radius as the outer circle of the cross pin; the cross pin grinding device is characterized by further comprising an adjusting gasket, two transmission rods and two adjustable center assemblies;
the adjusting gasket is clamped between the balance insert and the notch surface of the cross pin and is used for adjusting the height of the balance insert, one end of the transmission rod is connected with the lifting hole of the cross pin through threads, the other end of the transmission rod is inserted into the groove of the chuck, the cross pin is driven to rotate in a double-rod transmission mode, the two adjustable center components are respectively connected with the main shaft and the tailstock, and the cross pin is clamped on the grinding machine in a double-center mode;
the adjustable center assembly comprises a center body and four groups of rib assemblies, wherein the front part of the center body is a conical surface, four long waist grooves are distributed along the circumference of the conical surface in a cross shape, four groups of rib assemblies are respectively embedded in the four long waist grooves, each rib assembly comprises a compensation rib plate, an adjusting wedge strip and an adjusting screw, the adjusting wedge strip is arranged at the bottom of the long waist groove and can longitudinally move in the long waist groove, the upper part of the adjusting wedge strip is a longitudinal inclined surface, the compensation rib plate is embedded in the long waist groove and is positioned above the adjusting wedge strip, the upper part of the adjusting wedge strip is an arc surface, the lower part of the compensating wedge strip is a longitudinal inclined surface, the inclined surface is in contact with the inclined surface of the upper part of the adjusting wedge strip, the compensation rib plate and the adjusting wedge strip are fixed in the long waist groove through fixing screws, the adjusting screws are rotatably connected with the top ends of the adjusting wedge strip, the adjusting wedge strip can be driven to longitudinally move in the long waist groove and the four opposite to each other through the inclined surfaces of the adjusting wedge strip, and the positions of the four wedge strip are adjusted in the opposite to each other through the four wedge strip, and the positions of the four wedge strip are adjusted by the opposite to each groove.
2. The grinding device for the cross pin with the adjustable center according to claim 1, wherein the thickness of the adjusting gasket is adjusted to adjust the height of the arc surface of the balance insert, so that the arc surface is tightly connected with the outer circle of the cross pin, and the grinding at the notch of the cross pin is uninterrupted, thereby balancing the grinding force.
3. The cross pin grinding device adopting the adjustable tip according to claim 1, wherein the width of the adjusting wedge strip and the compensating rib plate is equal to the width of the long waist groove.
4. The cross pin grinding device adopting the adjustable center according to claim 1, wherein the adjusting wedge strip is provided with a plurality of waist-shaped through holes which are penetrated up and down so as to adapt to the movement adjustment of the adjusting wedge strip.
5. The grinding method of the cross pin by adopting the adjustable center is realized by the grinding device of the cross pin according to claim 1, and is characterized in that an adjusting gasket and a balance insert with proper thickness are arranged on the notch surface of the cross pin from bottom to top, so that the arc surface of the balance insert is slightly higher than the outer circle of the cross pin, simultaneously, two lifting holes are respectively connected with one transmission rod, then, the taper holes of a main shaft and a tail seat of a grinding machine are respectively provided with an adjustable center assembly, the cross pin is clamped on the grinding machine in a double-center mode, the ends of the two transmission rods are inserted into grooves of the chuck, the cross pin is connected with the main shaft in a double-rod transmission mode and synchronously rotates, then, the adjusting screws of four rib assemblies are rotated, so that the rib assemblies are tightly arranged in the tip holes of the cross pin, and finally, the outer circle of the cross pin is ground through a grinding wheel.
6. The method for grinding the cross pin by adopting the adjustable center according to claim 5, wherein the method for grinding the cross pin comprises the following specific steps:
1) Placing an adjusting gasket with proper height on the notch surface of the cross pin, installing the balance insert on the adjusting gasket, and fixing the adjusting gasket and the balance insert on the notch surface of the cross pin through screws so that the arc surface of the balance insert is higher than the excircle of the cross pin;
2) A transmission rod is screwed into two lifting holes on the end face of the cross pin respectively;
3) Respectively loading an adjustable center assembly into taper holes of a main shaft and a tailstock of the grinding machine, and unscrewing a fixing screw of the rib assembly;
4) Clamping the cross pin on the grinding machine in a double-center mode, inserting the end parts of two transmission rods into grooves of the chuck, and realizing transmission connection of the cross pin and a main shaft in a double-rod transmission mode;
5) The adjusting screw is rotated, so that four rib assemblies on the adjustable center assembly are tightly tensioned in the center hole of the cross pin, and the position of the cross pin is adjusted;
6) And starting the grinding machine to grind the outer circle of the cross pin, so as to meet the requirement of ensuring cylindricity.
7. The method for grinding a cross pin using an adjustable point as recited in claim 6, wherein said step 6) further comprises: if the tip hole of the cross pin is found to be deformed in the grinding process, the step 5) is executed to adjust the position of the cross pin so as to avoid out-of-tolerance in roundness and run-out caused by out-of-round of the tip hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210792102.6A CN115284171B (en) | 2022-07-05 | 2022-07-05 | Cross head pin grinding device and method adopting adjustable center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210792102.6A CN115284171B (en) | 2022-07-05 | 2022-07-05 | Cross head pin grinding device and method adopting adjustable center |
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| Publication Number | Publication Date |
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| CN115284171A CN115284171A (en) | 2022-11-04 |
| CN115284171B true CN115284171B (en) | 2023-10-10 |
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| 超精密外圆磨床双回转顶尖结构分析;张彬;杨辉;;制造技术与机床(第05期);87-89 * |
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