CN115284171A - Crosshead pin grinding device and method adopting adjustable center - Google Patents
Crosshead pin grinding device and method adopting adjustable center Download PDFInfo
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- CN115284171A CN115284171A CN202210792102.6A CN202210792102A CN115284171A CN 115284171 A CN115284171 A CN 115284171A CN 202210792102 A CN202210792102 A CN 202210792102A CN 115284171 A CN115284171 A CN 115284171A
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- crosshead pin
- pin
- grinding
- 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 crosshead pin grinding device and method adopting an adjustable center comprise a balance insert, an adjusting gasket, two driving rods and two adjustable center assemblies; the adjustable cross head pin clamping device is characterized in that an adjusting gasket with proper thickness and a balance insert are arranged on the gap surface of the cross head pin from bottom to top, the arc surface of the balance insert is slightly higher than the excircle of the cross head pin, a transmission rod is connected in a lifting hole of the cross head pin, an adjustable center assembly is arranged on a main shaft and a tailstock of a grinding machine respectively, the cross head pin is clamped on the grinding machine in a double center mode, the transmission rod is inserted into a groove of a chuck, the cross head pin and the main shaft are connected and synchronously rotated in the double rod transmission mode, an adjusting screw is rotated, the adjustable center assembly is enabled to be tensioned in a center hole of the cross head pin, and grinding processing on the excircle of the cross head pin is realized. The invention solves the balance problem of workpiece stress and grinding wheel operation, has the advantages of convenient and safe operation, achieves the effects of reducing cost and improving production efficiency and processing precision, and is suitable for grinding processing of the crosshead pin of a large diesel engine.
Description
Technical Field
The invention relates to machining of parts of a marine diesel engine, in particular to a crosshead pin grinding device and a crosshead pin grinding method adopting an adjustable center, and belongs to the technical field of machining.
Background
Referring to fig. 1, 2 and 3, the crosshead pin 8 is a stepped cylinder, a large cylinder of the crosshead pin is provided with a notch, a notch surface 81 is parallel to an axis of the crosshead pin 8, the notch surface is provided with symmetrically distributed screw holes 83, and end surfaces of small cylinders are provided with lifting holes 82 symmetrically distributed in a diameter direction. The crosshead pin 8 has a high requirement for machining the outer circle roughness and the cylindricity, the outer circle roughness is Ra0.05, and the cylindricity is generally required to be within 0.02mm, so the requirement for the grinding precision is particularly high.
At present, the grinding processing of the crosshead pin 8 on a grinding machine generally adopts a double-tip mode, a conventional tip is used for clamping a workpiece, a balance insert is arranged on a notch surface 81 of the workpiece through a screw hole 83, and then the workpiece is driven to rotate through a single driving rod connected to a driving screw hole 82, so that the grinding is realized. However, the grinding of the cross pin using this method has the following disadvantages and shortcomings: the single driving rod can cause uneven stress on a workpiece, particularly when the driving rod is located at an upper position, the workpiece is pulled away from the grinding wheel, and when the driving rod is located at a lower position, the workpiece is pulled towards the grinding wheel, so that the cylindricity of the workpiece 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 excircle of a workpiece after a period of time, when a grinding wheel is ground to a gap, the grinding wheel is in idle running, and the grinding force is discontinuously and unevenly distributed, so that the cylindricity of the gap area is out of tolerance; in addition, the roundness requirement of the center hole of the crosshead pin 84 is very high in a double-center clamping mode, the center hole needs to be ground at times in the grinding process, the precision requirement of a machine tool for grinding the center hole is also high, the center hole needs to be ground for multiple times sometimes to meet the requirement, and therefore workpieces can repeatedly get on and off due to frequent grinding of the center hole, the production efficiency is reduced, and the production order is disordered.
Disclosure of Invention
The invention aims to provide a crosshead pin grinding device and a crosshead pin grinding method adopting an adjustable center, which solve the problem of over poor cylindricity of a crosshead pin caused by unbalanced stress of a workpiece, unbalanced grinding of a grinding wheel, non-roundness of a center hole and the like in the excircle grinding process of the crosshead pin, and achieve the effects of improving the production efficiency and the grinding precision.
Based on the purpose, the technical scheme adopted by the invention is as follows:
a crosshead pin grinding device adopting an adjustable center is arranged on a grinding machine and connected with a crosshead 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 crosshead pin, two symmetrically arranged lifting holes are formed in the end surface of the crosshead pin, the crosshead pin grinding device comprises a balance insert, the balance insert is connected to the notch surface, the lower portion of the crosshead pin is a plane with the same shape and size as the notch surface, and the upper portion of the crosshead pin is an arc surface with the same radius as the excircle of the crosshead pin; the crosshead pin grinding device is characterized by further comprising an adjusting gasket, two driving rods and two adjustable center assemblies;
the adjusting shim is clamped between the balance insert and the notch surface of the crosshead pin and used for adjusting the height of the balance insert, one end of the driving rod is connected with a lifting hole of the crosshead pin through threads, the other end of the driving rod is inserted into a groove of the chuck and drives the crosshead pin to rotate in a double-rod driving mode, and the two adjustable tip assemblies are respectively connected with the main shaft and the tail seat and clamp the crosshead pin on the grinding machine in a double-tip mode;
the adjustable center assembly comprises a center body and four groups of rib assemblies, the front part of the center body is a conical surface, four long waist grooves are distributed on the conical surface in a cross shape along the circumference, the four groups of rib assemblies are respectively embedded in the four long waist grooves, each rib assembly comprises a compensation rib plate, an adjustment wedge strip and an adjustment screw, the adjustment wedge strip is placed at the bottom of each long waist groove and can move in the long waist groove in the longitudinal direction, the upper part of each adjustment wedge strip is an inclined plane in the longitudinal direction, the compensation rib plate is embedded in the long waist grooves and is positioned above the adjustment wedge strips, the upper part of each adjustment wedge strip is an arc surface, the lower part of each adjustment wedge strip is an inclined plane in the longitudinal direction, the inclined planes are in contact with the inclined planes at the upper parts of the adjustment wedge strips and have opposite directions, the compensation rib plates and the adjustment wedge strips are fixed in the long waist grooves through fixing screws, the adjustment screws are screwed on the center body and are connected with the top ends of the adjustment wedge strips, the adjustment screws can drive the adjustment wedge strips to move in the longitudinal direction in the long waist grooves through the adjustment wedge strips and act on the adjustment holes of the adjustment cross pins, and the adjustment pins are arranged at two ends of the adjustment rib plates.
Furthermore, the height of the arc surface of the balance insert can be adjusted by adjusting the thickness of the adjusting shim, so that the arc surface is tightly connected with the outer circle of the crosshead pin, the grinding at the notch of the crosshead pin is uninterrupted, and the balance of the grinding force is achieved.
Further, the width of the adjusting wedge strip and the compensating rib plate is equal to that of the long waist groove.
Furthermore, a plurality of up-and-down through waist-shaped through holes are formed in the adjusting wedge strips so as to adapt to the movement adjustment of the adjusting wedge strips.
The other technical scheme of the invention is as follows:
a method for grinding a crosshead pin by using an adjustable center through the crosshead pin grinding device is characterized in that an adjusting gasket and a balance insert with proper thickness are arranged on the gap surface of the crosshead pin from bottom to top, the arc surface of the balance insert is slightly higher than the outer circle of the crosshead pin, meanwhile, a driving rod is connected into each of two lifting holes, then, an adjustable center assembly is arranged in each of conical holes of a main shaft and a tailstock of a grinding machine, the crosshead pin is clamped on the grinding machine in a double center mode, the end parts of the two driving rods are inserted into grooves of a chuck, the crosshead pin is connected with the main shaft and synchronously rotates through the double rod driving mode, then, adjusting screws of four rib assemblies are rotated, the rib assemblies are tensioned in center holes of the crosshead pin, and finally, the outer circle of the crosshead pin is ground through a grinding wheel.
Further, the crosshead pin grinding method comprises the following specific steps:
1) Placing an adjusting gasket with proper height on the notch surface of the crosshead pin, mounting the balance insert on the adjusting gasket, and fixing the adjusting gasket and the balance insert on the notch surface of the crosshead pin through screws so that the arc surface of the balance insert is higher than the excircle of the crosshead pin;
2) A driving rod is screwed into each of the two lifting holes on the end surface of the crosshead pin;
3) Respectively installing an adjustable center assembly in the taper holes of the main shaft and the tailstock of the grinding machine, and unscrewing the fixing screw of the rib assembly for one circle;
4) Clamping the crosshead pin on the grinding machine in a double-center mode, inserting the end parts of two driving rods into grooves of the chuck, and realizing the driving connection of the crosshead pin and a main shaft in a double-rod driving mode;
5) Rotating the adjusting screw to enable four rib assemblies on the adjustable center assembly to be tensioned in the center hole of the crosshead pin, so that the position of the crosshead pin is adjusted;
6) And starting the grinding machine, and grinding the outer circle of the crosshead pin to meet the requirement of ensuring the cylindricity.
Further, the step 6) further comprises: if it is found that the tip hole of the crosshead pin is deformed during grinding, step 5) is performed to adjust the position of the crosshead pin so as to avoid out-of-roundness and runout due to out-of-roundness 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, because the adjustable center component is used, the rib component can be tightly tensioned in the center hole of the cross head pin through the adjusting screw, the purpose of quickly fine-adjusting the position of the workpiece is achieved, and therefore repeated center hole trimming is avoided, and repeated getting on and off are not needed.
2. The product quality is improved by adjusting the position height of the balance insert by using the adjusting gasket, so that the grinding wheel is always in contact with the surface of the workpiece, the grinding force of the grinding wheel is ensured to be stable, and the out-of-tolerance cylindricity of the gap area is avoided.
3. The stress on the workpiece is uniform, the safety is improved, and the workpiece is driven to move by adopting the double driving rods, so that the workpiece rotates stably, and the out-of-tolerance of the cylindricity of the crosshead pin is prevented.
4. The operation is safe, convenient and fast.
In conclusion, the grinding machine effectively solves the problem of balance between workpiece stress and grinding wheel operation, has the advantages of convenience and safety in operation, achieves the effects of reducing cost and improving production efficiency and machining precision, and can be suitable for grinding machining of large diesel engine crosshead pins.
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 view of the structure of the adjustable tip assembly.
Figure 5 is a schematic view of the tip body.
Fig. 6 is a left side view of fig. 5.
Fig. 7 is a schematic view of the rib assembly.
FIG. 8 is a schematic view of the actuator stem configuration.
Fig. 9 is a left side view of fig. 8.
Fig. 10 is a schematic view of a tuning pad.
FIG. 11 is a schematic view of a balancing insert.
Fig. 12 is a top view of fig. 11.
Fig. 13 is a state diagram of the use of the present invention.
In the figure: the adjustable center comprises a chuck 1, an adjustable center assembly 2, a compensation rib plate 3, a rib assembly 4, an adjusting screw 5, an apex body 6, a conical surface 61, a taper shank 62, a long waist groove 63, an adjusting wedge strip 7, a crosshead pin 8, a notch surface 81, a lifting hole 82, a screw hole 83, a tailstock 9, a driving rod 10, a fixing screw 11, a waist-shaped through hole 12, an adjusting gasket 13, a balance insert 14, a through hole 15 and a connecting through hole 16.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, but the scope of the present invention is not limited thereto.
Referring to fig. 1, 2 and 3, the large cylinder of the crosshead pin 8 is provided with a notch, the notch surface 81 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 head pin grinding apparatus is mounted on a grinding machine including a spindle, a chuck 1, and a tailstock 9; the crosshead pin grinding device comprises a balance insert 14, an adjusting gasket 13, two driving rods 10 and two adjustable center assemblies 2, wherein the two adjustable center assemblies 2 are tensioned in center holes at two ends of a crosshead 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 driving rod 10 is connected with a lifting hole 82 of the crosshead pin 8 through threads, the other end of each driving rod is inserted into a groove of a chuck 1 of the grinding machine, the balance insert 14 is connected onto a notch surface 81 of the crosshead 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 tip assembly 2 includes a tip body 6 and four sets of rib assemblies 4. Referring to fig. 5 and 6, the front portion of the apex body 6 is a conical surface 61, the rear portion thereof is a taper shank 62, four long waist grooves 63 are circumferentially distributed on the conical surface 61 in a cross shape, and screw holes for connecting the rib assemblies 4 are arranged in the long waist grooves 63. Four groups of rib assemblies 4 are respectively embedded in four long waist grooves 63 of the tip body 6, referring to fig. 7, each rib assembly 4 comprises a compensation rib plate 3, an adjusting wedge 7 and an adjusting screw 5. The adjusting wedge strip 7 is a long strip rod piece and is placed at the bottom of the long waist groove 63 and can slide in the long waist groove 63 along the longitudinal direction, the adjusting wedge strip 7 and the long waist groove 63 have the same width, the upper part of the adjusting wedge strip is an inclined plane along the longitudinal direction, and a plurality of up-and-down through waist-shaped through holes 12 are formed in the adjusting wedge strip 7 and are used for penetrating through the fixing screws 11. The compensation rib plate 3 is a wedge-shaped long bar member, the upper part of the compensation rib plate is an arc surface, the lower part of the compensation rib plate is an inclined surface along the longitudinal direction, and the direction of the inclined angle of the compensation rib plate is opposite to the inclined surface of the upper part of the adjustment wedge strip 7; the compensation rib plate 3 is embedded in the long waist groove 63 and positioned above the adjusting wedge strip 7, the inclined plane at the lower part of the compensation rib plate is in face-to-face contact with the inclined plane at the upper part of the adjusting wedge strip 7, and the arc surface at the upper part of the compensation rib plate is connected with the conical surface 61 of the tip body 6; the compensation rib plate 3 is provided with a plurality of connecting through holes, the fixing screws 11 penetrate through the connecting through holes and the waist-shaped through holes 12 of the adjusting wedge strips 7 to be connected with the screw holes at the bottom of the long waist-shaped groove 63, and the compensation rib plate 3 and the adjusting wedge strips 7 are fixed in the long waist-shaped groove 63. The adjusting screw 5 is screwed on the tip 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 can be rotated to drive the adjusting wedge strip 7 to move longitudinally 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 the four groups of rib strip assemblies 4 can be tensioned in tip holes at two ends of the crosshead pin 8, the arc surface at the upper part of the compensating rib plate 3 is ensured to be always in close contact with the tip holes to finely adjust the position of a workpiece, and the tip holes are prevented from being polished at times in the grinding process, so that the production efficiency is reduced due to repeated loading and unloading of the workpiece.
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 crosshead pin 8, and the other end is a round rod end inserted into a groove of the grinder chuck 1. The rotation of the chuck 1 of the grinding machine stirs the crosshead pin 8 through two driving rods 10 to do rotary motion, and the problem that the stress of a single driving rod is not uniform is solved.
Referring to fig. 11 and 12, the balance insert 14 is a small semi-cylinder, the lower part of the small semi-cylinder is a plane with the same shape and size as the notch surface 81 of the cross pin 8, and the upper part of the small semi-cylinder is a circular 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 therethrough, and the position of the connecting through hole 16 is the same as the position of the screw hole 83 of the notch surface 81 of the crosshead pin 8.
Referring to fig. 10, the adjusting shim 13 is a flat plate member having the same shape and size as the notched surface 81 of the cross pin 8, and the adjusting shim 13 is provided with a through hole 15, through which a screw is inserted into the through hole 15, at the same position as the screw hole 83 of the notched surface 81 of the cross pin 8. The thickness of the adjusting shim 13 can be adjusted to adjust the height of the arc surface of the balance insert 14, and the arc surface is tightly connected with the outer circle of the crosshead pin 8, so that the grinding wheel can still be in a grinding state when grinding is carried out to the notch, and the problem of unbalanced grinding force caused by idle rotation is avoided.
The invention discloses a crosshead pin grinding method adopting an adjustable center, which comprises the following steps:
referring to fig. 13, the balance insert 14 is installed in the notch of the cross pin 8, the adjusting shim 13 with a 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 end of the driving rod 10 is fixedly connected to each of two lifting holes 82 in the end surface of the cross pin 8, then the adjustable center assembly 2 is installed in each of the tapered holes of the grinding machine spindle and the tailstock 9, the cross pin 8 is installed on the machine tool by using the double-center clamping method, the other end of the driving rod 10 is inserted into the groove of the chuck 1, the cross pin 8 is connected and rotated synchronously with the grinding machine spindle, then the four adjusting screws 5 of the adjustable center assembly 2 are rotated, the four evenly distributed bar assemblies 4 on the conical surface 61 are rotated in the center holes of the cross pin 8, and finally, the outer circle of the tensioning pin 8 is ground by the axial reciprocating movement of the grinding wheel and the radial rotary movement of the cross pin 8.
The crosshead pin grinding method comprises the following specific steps:
1) When the crosshead pin 8 is ground by using a double center method, a balance insert 14 is installed in a gap of the crosshead pin 8, an adjusting shim 13 with proper height is installed between the balance insert 14 and a gap surface 81 of the crosshead pin 8, and the arc surface of the balance insert 14 is higher than the outer circle of the crosshead pin 8;
2) The driving rod 10 is respectively arranged in two lifting holes 82 on the end surface of the crosshead pin 8;
3) The adjustable center assembly 2 is respectively arranged in the taper holes of the machine tool main shaft and the tailstock 9, and the fixing screw 11 of the rib assembly 4 on the adjustable center assembly 2 is unscrewed for one circle;
4) The crosshead pin 8 is installed on a machine tool by adopting a double-tip clamping method, the end part of the driving rod 10 is inserted into the groove of the chuck 1, and the driving connection of the crosshead pin 10 and a main shaft is realized;
5) Adjusting the adjusting screws 5 on the rib assemblies 4 to enable the four uniformly distributed rib assemblies 4 on the conical surface 61 of the adjustable center assembly 2 to be tensioned in center holes of the cross head pins 8 so as to adjust the position of a 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 as to avoid the out-of-round roundness and jump of the workpiece caused by the out-of-round center hole in the grinding process;
6) And starting a main shaft and a grinding wheel of the grinding machine, and grinding the outer circle of the crosshead pin 8 through the grinding wheel to achieve the aim of ensuring the cylindricity.
The invention effectively solves the balance problem of the stress of the crosshead pin workpiece and the rotation of the grinding wheel, avoids repeated loading and unloading, greatly improves the working efficiency and the processing precision, is simple and convenient in actual operation, effectively reduces the labor intensity, improves the production efficiency and reduces the cost.
Claims (7)
1. A crosshead pin grinding device adopting an adjustable center is arranged on a grinding machine and connected with a crosshead 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 crosshead pin, two symmetrically arranged lifting holes are formed in the end surface of the crosshead pin, the crosshead pin grinding device comprises a balance insert, the balance insert is connected to the notch surface, the lower portion of the crosshead pin is a plane with the same shape and size as the notch surface, and the upper portion of the crosshead pin is an arc surface with the same radius as the excircle of the crosshead pin; the crosshead pin grinding device is characterized by further comprising an adjusting gasket, two driving rods and two adjustable center assemblies;
the adjusting shim is clamped between the balance insert and the notch surface of the crosshead pin and used for adjusting the height of the balance insert, one end of the driving rod is connected with a lifting hole of the crosshead pin through threads, the other end of the driving rod is inserted into a groove of the chuck and drives the crosshead pin to rotate in a double-rod driving mode, and the two adjustable tip assemblies are respectively connected with the main shaft and the tail seat and clamp the crosshead pin on the grinding machine in a double-tip mode;
the adjustable center assembly comprises a center body and four groups of rib assemblies, the front part of the center body is a conical surface, four long waist grooves are distributed on the conical surface in a cross shape along the circumference, the four groups of rib assemblies are respectively embedded in the four long waist grooves, each rib assembly comprises a compensation rib plate, an adjustment wedge strip and an adjustment screw, the adjustment wedge strip is placed at the bottom of each long waist groove and can move in the long waist groove in the longitudinal direction, the upper part of each adjustment wedge strip is an inclined plane in the longitudinal direction, the compensation rib plate is embedded in the long waist grooves and is positioned above the adjustment wedge strips, the upper part of each adjustment wedge strip is an arc surface, the lower part of each adjustment wedge strip is an inclined plane in the longitudinal direction, the inclined planes of the upper parts of the adjustment wedge strips are in contact with each other and are opposite in direction, the compensation rib plates and the adjustment wedge strips are fixed in the long waist grooves through fixing screws, the adjustment screws are screwed on the center body and are connected with the top ends of the adjustment wedge strips, the adjustment screws can drive the adjustment wedge strips to move in the longitudinal direction in the long waist grooves, and the adjustment pin is positioned at two ends of the compensation wedge strips.
2. The apparatus of claim 1, wherein the thickness of the adjustment pad is adjusted to adjust the height of the arc surface of the balance insert so that the arc surface is in tight contact with the outer circumference of the cross pin, thereby achieving a balance of the grinding forces without interruption in grinding at the notch of the cross pin.
3. The apparatus according to claim 1, wherein the width of the adjusting wedge strip and the compensating rib is equal to the width of the long waist groove.
4. The apparatus as claimed in claim 1, wherein the adjusting wedge strip has a plurality of through-holes formed in a kidney shape to accommodate movement of the adjusting wedge strip.
5. A method for grinding a crosshead pin by using an adjustable center, which is realized by the crosshead pin grinding device in claim 1, is characterized in that an adjusting gasket and a balance insert with proper thickness are arranged on the gap surface of the crosshead pin from bottom to top, the arc surface of the balance insert is slightly higher than the outer circle of the crosshead pin, a driving rod is connected to each of the two lifting holes, an adjustable center assembly is arranged in each of the conical holes of a main shaft and a tailstock of a grinding machine, the crosshead pin is clamped on the grinding machine in a double center mode, the end parts of the two driving rods are inserted into the grooves of the chuck, the crosshead pin is connected with the main shaft and synchronously rotates in a double rod transmission mode, then the adjusting screws of the four rib assemblies are rotated, the rib assemblies are tensioned in the center holes of the crosshead pin, and finally the outer circle of the crosshead pin is ground by a grinding wheel.
6. The method of grinding a cross pin using an adjustable center according to claim 5, wherein the method of grinding a cross pin comprises the steps of:
1) Placing an adjusting gasket with proper height on the notch surface of the crosshead pin, mounting the balance insert on the adjusting gasket, and fixing the adjusting gasket and the balance insert on the notch surface of the crosshead pin through screws so that the arc surface of the balance insert is higher than the excircle of the crosshead pin;
2) A driving rod is screwed into each of the two lifting holes on the end surface of the crosshead pin;
3) Respectively installing an adjustable center assembly in the taper holes of the main shaft and the tailstock of the grinding machine, and unscrewing the fixing screw of the rib assembly for one circle;
4) Clamping the crosshead pin on the grinding machine in a double-center mode, inserting the end parts of two driving rods into grooves of the chuck, and realizing the driving connection of the crosshead pin and a main shaft in a double-rod driving mode;
5) Rotating the adjusting screw to enable four rib assemblies on the adjustable center assembly to be tensioned in center holes of the cross head pin, so that the position of the cross head pin is adjusted;
6) And starting the grinding machine, and grinding the outer circle of the crosshead pin to meet the requirement of ensuring the cylindricity.
7. The method of grinding a crosshead pin using an adjustable center according to claim 6, wherein the step 6) further comprises: if it is found that the tip hole of the crosshead pin is deformed during grinding, step 5) is performed to adjust the position of the crosshead pin so as to avoid out-of-roundness and runout due to out-of-roundness 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 |
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| 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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| CN115284171A true CN115284171A (en) | 2022-11-04 |
| CN115284171B CN115284171B (en) | 2023-10-10 |
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| Title |
|---|
| 张彬;杨辉;: "超精密外圆磨床双回转顶尖结构分析", 制造技术与机床, no. 05, pages 87 - 89 * |
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| Publication number | Publication date |
|---|---|
| CN115284171B (en) | 2023-10-10 |
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