CN109848740B - Clamp for high-precision machining of outer circle molded line of clamp - Google Patents
Clamp for high-precision machining of outer circle molded line of clamp Download PDFInfo
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- CN109848740B CN109848740B CN201910185017.1A CN201910185017A CN109848740B CN 109848740 B CN109848740 B CN 109848740B CN 201910185017 A CN201910185017 A CN 201910185017A CN 109848740 B CN109848740 B CN 109848740B
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Abstract
The invention discloses a clamp for high-precision machining of excircle profiles of clamps, which comprises: the chuck is provided with a through hole at the center; and a mandrel; and a pull rod disposed through the mandrel from the opening, the pull rod comprising: a rod, and a rod fixing member; and a clamp fixing member; the fixing screw penetrates through the fixing hole and is in threaded connection with the rod fixing piece; the rod fixing piece penetrates through the through groove of the clamp fixing piece, and the clamp fixing piece is fixed at the two ends of the rod through fixing screws. The invention can effectively control the deformation of the piston caused by clamping force in the process of finish turning the excircle, ensures that the deformation of the long shaft and the short shaft of the piston is in a certain range after the piston is subjected to the clamping force, ensures the processing precision, and has simple structure, safety and easy operation; meanwhile, when the large-diameter piston of the marine diesel engine is finely processed, the precision of the excircle profile can be ensured, and the clamp is simple in structure, safe and easy to operate. The method is scientific, practical, safe, reliable, low in cost and convenient to popularize and use.
Description
Technical Field
The invention relates to the technical field of part processing equipment, in particular to a clamp for high-precision processing of excircle molded lines of a clamp.
Background
The piston is one of the heavy parts of the diesel engine, forms a combustion chamber of the diesel engine together with a cylinder cover and a cylinder sleeve, is connected with a connecting rod through a piston pin, and converts linear motion obtained by the piston after gas explosion pressure into rotary motion of a crankshaft. In order to work normally under the severe working conditions, the outer circle of the piston is designed into a non-circular (approximate ellipse) shape, and the deformation generated by factors such as thermal expansion and the like during the working of the piston can be expanded along the direction of a pin shaft of the piston (a short shaft), so that the cross section of the piston becomes a standard cylindrical shape and is better attached to the wall of a cylinder, the guiding function is ensured, and the lubricating effect with an oil clearance of the wall of the cylinder is ensured. Therefore, the outer circle line of the piston has strict form and position tolerance and size requirement, and is a necessary condition for the working performance and the service life of the piston.
The section of the excircle of the piston is approximate to an ellipse and is divided into a long axis and a short axis. Because the piston pin needs to be supported in the short shaft direction, the mass distribution of the part is more, so that the mass distribution of the piston at the skirt part is uneven, but the piston is in a standard cylindrical shape after being deformed in a thermal state during working.
The excircle profile of the piston is an important parameter, the tolerance between a long shaft and a short shaft is extremely tight, and the radius direction is 0.015mm, which must meet the requirement. Otherwise, the cylinder sleeve is abnormally abraded when the operation of the diesel engine is influenced, and serious accidents such as cylinder pulling and the like can be caused when the diesel engine is used.
However, in the prior art machining jig, there is no suitable jig, or the clamping force is applied to the bottom end of the pin hole during machining, the skirt portion of the piston is deformed, and the outer diameter dimension is out of tolerance; or the structure is complex and cannot be implemented in the field.
Therefore, it is necessary to provide a clamp for machining an outer circular profile of a clamp with high precision to solve the above problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides the clamp for processing the excircle profile of the clamp with high precision, which is scientific, practical, safe, reliable, low in cost and convenient to popularize and use.
The invention provides a clamp for high-precision machining of excircle profiles of clamps, which comprises:
the chuck is provided with a through hole at the center; and
the fixture comprises a mandrel 1, wherein the mandrel 1 penetrates through the chuck through a through hole, an opening is formed in the side face of the mandrel 1, a male spigot is arranged at one end of the mandrel 1, and when the fixture is used, a female spigot is arranged at one end of the fixture and matched with the female spigot so as to fix the fixture on one end of the mandrel 1; and
a pull rod 2, the pull rod 2 being disposed through the mandrel 1 by an opening, the pull rod 2 comprising:
a rod 201, an
The clamp fixing member 3 is fixed at two ends of the rod fixing member 202, the clamp fixing member 202 cannot rotate when in use, the rod fixing member 202 is symmetrically arranged at two ends of the rod 201, the rod fixing member 202 is further provided with fixing holes 203, and the fixing holes 203 are provided with fixing screws 5 in a penetrating manner for fixing; and the clamp fixing member 3 is fixed on the rod fixing member 202, and it should be noted here that the outer diameter of the rod 201 is larger than the inner diameter of the through groove 301 of the clamp fixing member 3, so that the clamp fixing member 3 is clamped on the rod fixing member 202 by the fixing screw 5 and the rod 201.
The fixture fixing part 3 is provided with a through groove 301 penetrating through the top end and the bottom end of the fixture fixing part 3, the inner diameter of the through groove 301 is arranged to be attached to the outer diameter of the rod fixing part 202, and at least one side surface of the fixture fixing part 3 is a plane; and
a fixing screw 5, wherein the fixing screw 5 penetrates through the fixing hole 203 and is in threaded connection with the rod fixing piece 202;
the rod fixing member 202 penetrates through the through groove 301 of the clamp fixing member 3, and the clamp fixing member 3 is fixed at both ends of the rod 201 by the fixing screws 5.
Optionally, one surface of the clamp fixing member 3 close to the mandrel 1 is a plane.
Optionally, the rod 201 is of a diameter-variable structure, and the diameter of the rod 201 gradually increases in a direction extending from the center of the rod 201 to the two ends;
a key groove 2011 is also arranged at the center of the rod body 201;
a convex key is further arranged in the opening of the mandrel 1 in a protruding mode, the key groove 2011 is matched with the convex key, and the key groove 2011 is matched with the convex key, so that the clamp fixing piece 3 cannot rotate on the rod body 201.
Further preferably, the pull rod 2 is further provided with a step 210 coaxially protruding thereon.
Further preferably, the bar fixing member 202 is a rectangular fixing piece, the through groove 301 is a rectangular through groove, and the inner diameter of the rectangular through groove is matched with the outer diameter of the rectangular fixing piece.
Compared with the related art, the invention has the following beneficial effects:
the invention can effectively control the deformation of the piston caused by clamping force in the process of finish turning the excircle, ensures that the deformation of the long shaft and the short shaft of the piston is in a certain range after the piston is subjected to the clamping force, ensures the processing precision, and has simple structure, safety and easy operation; meanwhile, when the large-diameter piston of the marine diesel engine is finely processed, the precision of the excircle profile can be ensured, and the clamp is simple in structure, safe and easy to operate. The method is scientific, practical, safe, reliable, low in cost and convenient to popularize and use.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a schematic front view of the pull rod 2 of the present invention;
FIG. 4 is a schematic side view of the pull rod 2 of the present invention;
fig. 5 is a schematic structural view of the jig fixing member 3 of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Referring to fig. 1 and 2, the clamp for high-precision machining of the excircle profile of the clamp of the present invention includes:
the chuck is provided with a through hole at the center; and
the fixture comprises a mandrel 1, wherein the mandrel 1 penetrates through the chuck through a through hole, an opening is formed in the side face of the mandrel 1, a male spigot is arranged at one end of the mandrel 1, and when the fixture is used, a female spigot is arranged at one end of the fixture and matched with the female spigot so as to fix the fixture on one end of the mandrel 1; and
a pull rod 2, the pull rod 2 being disposed through the mandrel 1 by an opening, the pull rod 2 comprising:
a rod 201, an
The clamp fixing member 3 is fixed at two ends of the rod fixing member 202, the clamp fixing member 202 cannot rotate when in use, the rod fixing member 202 is symmetrically arranged at two ends of the rod 201, the rod fixing member 202 is further provided with fixing holes 203, and the fixing holes 203 are provided with fixing screws 5 in a penetrating manner for fixing; and the clamp fixing member 3 is fixed on the rod fixing member 202, and it should be noted here that the outer diameter of the rod 201 is larger than the inner diameter of the through groove 301 of the clamp fixing member 3, so that the clamp fixing member 3 is clamped on the rod fixing member 202 by the fixing screw 5 and the rod 201.
The fixture fixing part 3 is provided with a through groove 301 penetrating through the top end and the bottom end of the fixture fixing part 3, the inner diameter of the through groove 301 is arranged to be attached to the outer diameter of the rod fixing part 202, and at least one side surface of the fixture fixing part 3 is a plane; and
a fixing screw 5, wherein the fixing screw 5 penetrates through the fixing hole 203 and is in threaded connection with the rod fixing piece 202;
the rod fixing member 202 penetrates through the through groove 301 of the clamp fixing member 3, and the clamp fixing member 3 is fixed at both ends of the rod 201 by the fixing screws 5.
Example 1
Referring to fig. 5, in the present embodiment, one surface of the fixture fixing member 3 close to the mandrel 1 is a plane. When in use, the two clamp fixing pieces 3 accurately apply pressure on two sides of the bottom end of the piston pin hole in a surface contact mode respectively.
Example 2
In this embodiment, referring to fig. 3 and 4, the rod 201 has a diameter-variable structure, and the diameter of the rod 201 gradually increases in a direction extending from the center of the rod 201 to two ends;
a key groove 2011 is also arranged at the center of the rod body 201;
a convex key is further arranged in the opening of the mandrel 1 in a protruding mode, the key groove 2011 is matched with the convex key, and the key groove 2011 is matched with the convex key, so that the clamp fixing piece 3 cannot rotate on the rod body 201.
The pull rod 2 is further coaxially and convexly provided with a step 210, and the step 210 can prevent the pull rod 2 from passing through the mandrel 1 to cause inconvenience during installation.
The bar body fixing piece 202 is a rectangular fixing piece, the through groove 301 is a rectangular through groove, and the inner diameter of the rectangular through groove is attached to the outer diameter of the rectangular fixing piece.
The invention will be further explained by taking the excircle profile of the large-diameter piston of the marine diesel engine as an example.
In order to control the clamping force of the piston excircle molded line finish turning, the invention changes the mode that the bottom end of the piston pin hole is in line contact with the concentrated clamping force, so that the clamping force is applied to two sides of the bottom of the pin hole in a surface contact mode, the stress state of the piston is changed, the clamp is redesigned through stress analysis and verification, the structure is required to be simple, safe and easy to operate, and the precision control of the piston excircle molded line during finish turning is realized.
When the clamp is installed:
firstly, a mandrel 1 is connected with a main shaft end of a turning and milling composite center, a piston is installed, a concave spigot at the bottom of the piston is positioned, then a center point at a tail seat end of the turning and milling composite center is used for propping against a center hole at the top of the piston, a pull rod 2 penetrates through the mandrel 1 from an opening to be connected with the mandrel, a step 210 of the pull rod 2 ensures the relative positions of the pull rod and the mandrel 1, and a key groove 2011 is used for preventing the pull rod 2 from rotating in the hole of the mandrel 1.
Secondly, a clamp fixing member 3 is inserted upwards from the lower end of the pull rod 2, and the through groove 301 and the rod body fixing member 202 are connected to prevent rotation. The fixing screw 5 is locked in a hole at the lower end of the rod fixing member 202.
Again, another clamp mount 3 is telescoped down from the upper end of the pull rod 2, again, with the same structure, to prevent rotation. The fixing screw 5 is locked in a hole at the lower end of the rod fixing member 202.
And finally, opening the machine tool to tighten the mandrel 1, tightening the clamp fixing pieces 3 through the pull rod 2, applying pressure to two sides of the bottom end of the piston pin hole by the two clamp fixing pieces 3 in a surface contact mode respectively, so that the piston is stably connected with the clamp, and the new clamp design ensures that the clamp fixing pieces 3 tightly press the piston at the correct position. And (5) loosening the tailstock center of the machine tool, retreating to a safe position, and starting machining. Set screw 5 locks in the hole at barred body mounting 202 both ends, prevents that anchor clamps mounting 3 from throwing away pull rod 2 in the turning process, and set screw 5 direction is perpendicular with centrifugal force direction during the turning, and pull rod 2 material strength is far greater than centrifugal force during the turning, safe and reliable.
The precision of the excircle profile of the finish turning piston is ensured through the use and processing verification of the clamp, the purpose of deformation prevention is achieved, and the process stability is good. The precision machining method has the advantages that the controllable precision machining of the finish-turned excircle of the large piston is realized, the method is a novel finish machining technical method based on stress-strain analysis, the problem that the contour line of the finish-turned excircle of the large piston is out of tolerance is solved, and the bottleneck of non-circular finish machining of the contour line of the excircle of the large piston of the diesel engine is broken through. The method is in a leading position in the industry, and has wider application field and better popularization value.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. The utility model provides a folder excircle molded lines high accuracy adds clamping apparatus which characterized in that includes:
the chuck is provided with a through hole at the center; and
the mandrel (1) penetrates through the chuck through a through hole, an opening is formed in the side face of the mandrel (1), and a male end is arranged at one end of the mandrel (1); and
a pull rod (2), the pull rod (2) being arranged by an opening through the mandrel (1), the pull rod (2) comprising:
a rod (201), and
the bar body fixing parts (202), the bar body fixing parts (202) are symmetrically arranged at two ends of the bar body (201), and fixing holes (203) are formed in the bar body fixing parts (202); and
the fixture fixing piece (3) is provided with a through groove (301) penetrating through the top end and the bottom end of the fixture fixing piece (3), the inner diameter of the through groove (301) is arranged in a manner of being attached to the outer diameter of the rod fixing piece (202), and at least one side surface of the fixture fixing piece (3) is a plane; and
the fixing screw (5), the fixing screw (5) passes through the fixing hole (203) and is screwed with the rod fixing piece (202);
the rod fixing piece (202) penetrates through the through groove (301) of the clamp fixing piece (3), and the clamp fixing piece (3) is fixed at two ends of the rod (201) through the fixing screws (5).
2. A clamp for high precision machining of external cylindrical profiles of clamps according to claim 1, characterized in that the side of the clamp fixing member (3) close to the mandrel (1) is a flat surface.
3. A clamp outer circular line high precision machining clamp according to claim 1, characterized in that the rod (201) is of a reducing structure, and the diameter of the rod (201) is gradually increased in a direction extending from the center of the rod (201) to two ends;
a key groove (2011) is also arranged at the center of the rod body (201);
a convex key is further arranged in the opening of the mandrel (1) in a protruding mode, and the key groove (2011) is matched with the convex key.
4. A clamp for high-precision machining of an external cylindrical profile of a clamp according to any one of claims 1 to 3, characterized in that the pull rod (2) is further provided with a step (210) in a coaxial and protruding manner.
5. A clamp for high-precision machining of an external cylindrical profile of a clamping piece as claimed in any one of claims 1 to 3, wherein the rod fixing piece (202) is a rectangular fixing piece, the through groove (301) is a rectangular through groove, and the inner diameter of the rectangular through groove is matched with the outer diameter of the rectangular fixing piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185017.1A CN109848740B (en) | 2019-03-12 | 2019-03-12 | Clamp for high-precision machining of outer circle molded line of clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910185017.1A CN109848740B (en) | 2019-03-12 | 2019-03-12 | Clamp for high-precision machining of outer circle molded line of clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109848740A CN109848740A (en) | 2019-06-07 |
| CN109848740B true CN109848740B (en) | 2021-08-13 |
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ID=66900483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910185017.1A Active CN109848740B (en) | 2019-03-12 | 2019-03-12 | Clamp for high-precision machining of outer circle molded line of clamp |
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| Country | Link |
|---|---|
| CN (1) | CN109848740B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2063749A (en) * | 1979-11-21 | 1981-06-10 | Roehm Guenter H | Rotary clamping cylinder with a clamping piston for clamping devices on machine tools |
| CN202639924U (en) * | 2012-07-12 | 2013-01-02 | 哈尔滨汽轮机厂有限责任公司 | Race milling cutter turning fixture |
| CN102962706A (en) * | 2012-11-16 | 2013-03-13 | 安阳鑫盛机床股份有限公司 | Oval turning lathe fixture for use in piston processing of marine diesel engine |
| CN204183303U (en) * | 2014-10-28 | 2015-03-04 | 东风（十堰）汽车标准件有限公司 | The pneumatic dop of the special high nut end face of turning of not stopping |
| CN107671583A (en) * | 2017-10-24 | 2018-02-09 | 邹开林 | A kind of engine piston processing jig |
| CN107962413A (en) * | 2018-01-15 | 2018-04-27 | 山东振挺精工活塞有限公司 | A kind of clamping device and its clamping technique of the processing of auxiliary piston top surface |
-
2019
- 2019-03-12 CN CN201910185017.1A patent/CN109848740B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2063749A (en) * | 1979-11-21 | 1981-06-10 | Roehm Guenter H | Rotary clamping cylinder with a clamping piston for clamping devices on machine tools |
| CN202639924U (en) * | 2012-07-12 | 2013-01-02 | 哈尔滨汽轮机厂有限责任公司 | Race milling cutter turning fixture |
| CN102962706A (en) * | 2012-11-16 | 2013-03-13 | 安阳鑫盛机床股份有限公司 | Oval turning lathe fixture for use in piston processing of marine diesel engine |
| CN204183303U (en) * | 2014-10-28 | 2015-03-04 | 东风（十堰）汽车标准件有限公司 | The pneumatic dop of the special high nut end face of turning of not stopping |
| CN107671583A (en) * | 2017-10-24 | 2018-02-09 | 邹开林 | A kind of engine piston processing jig |
| CN107962413A (en) * | 2018-01-15 | 2018-04-27 | 山东振挺精工活塞有限公司 | A kind of clamping device and its clamping technique of the processing of auxiliary piston top surface |
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| Publication number | Publication date |
|---|---|
| CN109848740A (en) | 2019-06-07 |
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