CN113352058B - High-precision part machining method - Google Patents
High-precision part machining method Download PDFInfo
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- CN113352058B CN113352058B CN202110698567.0A CN202110698567A CN113352058B CN 113352058 B CN113352058 B CN 113352058B CN 202110698567 A CN202110698567 A CN 202110698567A CN 113352058 B CN113352058 B CN 113352058B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a high-precision part machining method, which uses a common precision machining center to cancel a fourth shaft turntable, so that the equipment cost is reduced; the constant temperature workshop is canceled, and the use cost is reduced; the forward and the one side of the workpiece are processed by a pair of clamps, so that the time from Kong Zhuaitai with the position requirement on one side to the processing on the other opposite side is reduced, the process beats are balanced, and the yield is improved; and positioning errors influenced by secondary clamping are eliminated, and the size precision of the hole with the position degree requirement on one surface of the workpiece is ensured.
Description
Technical Field
The invention belongs to the field of automobile part machining and manufacturing, and particularly relates to a high-precision part machining method.
Background
State of the art: the high-precision workpiece has the requirement of position degree of the machining holes on the front surface and the back surface, and the reference of the position degree is the machining hole in the same surface direction of the workpiece. The traditional processing method comprises the following steps: the machining process of the other opposite surface uses a machining center to machine all parts (without holes with the position requirement) of the other opposite surface of the workpiece, the machining process of one surface uses another high-precision machining center and a fourth shaft turntable, the workpiece is positioned by taking the machining holes of the machining process of the other opposite surface as a support, the machining surface is placed on a fourth shaft turntable fixture, the reference holes of the other opposite surface of the workpiece are provided with holes with the position requirement and the rest parts, the turntable rotates 180 degrees and then machines one surface with the holes with the position requirement, the reference holes are machined once, and the holes with the position requirement are arranged on the front surface and the rear surface, so that the dimensional precision is ensured.
The defects are that: 1. the machining center and the fourth shaft turntable have high precision and high stability, and commonly select the equipment with the known brands, so that the equipment cost is high; 2. the processing precision of equipment is affected by the change of the environmental temperature, and in order to ensure the processing precision, the equipment needs to be provided with a constant-temperature workshop, so that the use cost is high; 3. holes with position requirements on one surface and holes with position requirements on the other opposite surface are processed in one process, so that the process processing beat of one surface of a workpiece is fast, the process processing beat of the other opposite surface is slow, the beat is uneven, and the productivity is low; 4. if the fourth shaft turntable is canceled in workpiece processing, a pair of clamps are respectively used for processing the front and the back surfaces of the workpiece, and the processing dimensional accuracy of the hole with the position degree requirement on one surface of the workpiece can be influenced by the positioning error of the secondary clamping.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a high-precision part processing method which aims to solve the existing technical problems.
The invention adopts the following technical scheme to achieve the aim of the invention:
a processing device of the processing method comprises a first processing clamp and a second processing clamp;
the first processing clamp comprises a first bottom plate and a first clamp substrate, a clearance through hole is formed in the first clamp substrate, a plurality of positioning pins, supporting cylinder assemblies, clamping cylinder assemblies and guide blocks are arranged along the edges of the clearance through hole, and the positions of the clamping cylinder assemblies correspond to the positions of the positioning pins;
the second processing clamp comprises a second bottom plate and a second clamp substrate, a clearance through hole is formed in the second clamp substrate, a plurality of positioning pins, supporting cylinder assemblies, clamping cylinder assemblies and guide blocks are arranged along the edges of the clearance through hole, and the positions of the clamping cylinder assemblies correspond to the positions of the positioning pins;
the first processing clamp is used for fixing a workpiece and enabling one surface of the workpiece to face upwards, and the second processing clamp is used for fixing the workpiece and enabling the other opposite surface of the workpiece to face upwards;
the processing method comprises the following steps:
s1, placing a first machining clamp and a second machining clamp on a workbench of a vertical machining center, and connecting a supporting cylinder assembly and a clamping cylinder assembly of the first machining clamp and the second machining clamp with a hydraulic system of the vertical machining center;
s2, placing a machined part at the position of a clearance through hole of the first machining clamp, positioning through a guide block and a positioning pin, and then clamping through a supporting cylinder assembly and a clamping cylinder assembly;
s3, machining one surface part of the workpiece by the vertical machining center;
s4, placing the machined part at the position of the avoidance through hole of the second machining clamp, positioning through the guide block and the positioning pin, and then clamping through the supporting cylinder assembly and the clamping cylinder assembly;
s5, measuring and recording the two through holes Kong Zuobiao processed in the step S3 through a machine tool measuring head, and judging whether the two through holes are within the set position and hole size tolerance range or not:
if the vertical machining center is out of the set position tolerance range, alarming and stopping working;
if the machining coordinate system is within the set position tolerance range, reestablishing the machining coordinate system through the data of the positions and the hole sizes of the two through holes;
the vertical machining center is used for machining the other opposite surface part of the machined part;
s6, deburring the machined surface.
Preferably, the positioning pin adopts a floating conical structure.
Preferably, the supporting cylinder assembly comprises a supporting cylinder body, a supporting rod is arranged at the driving end of the supporting cylinder body, the supporting rod is obliquely arranged, the moving direction of the supporting rod faces the avoidance through hole, the clamping cylinder assembly comprises a clamping cylinder body, a support is arranged on the clamping cylinder body, a clamping rod is hinged to the support, one end of the clamping rod is connected with the driving end of the clamping cylinder body, and the other end of the clamping rod is located above the locating pin.
Preferably, in step S2, before the workpiece is placed on the first processing fixture, it is checked whether the locating surface and the burrs on the clamping surface of the workpiece are cleaned, whether the blank has defects such as cracks and under casting, and whether the flatness of the workpiece is within 0.03, if the flatness is out of tolerance, the flatness is required to be corrected, and meanwhile, the oil pressures of the supporting cylinder assembly and the clamping cylinder assembly are adjusted to be 4-4.5MPa.
Preferably, in step S3, the vertical machining center calls an end mill to perform rough and finish milling on an end surface of one side of the workpiece and an end surface of a hole to be machined; and then a drill bit, a boring cutter, a reamer, an extrusion tap and a milling cutter are called for processing the hole.
Preferably, in step S3, the position degree of the hole site having the position degree requirement is 0.06, and in step S5, the position tolerance of the through hole is ±0.025.
Preferably, in step S5, the two through holes Kong Zuobiao machined in step S3 are measured and recorded by the machine tool probe, and after reestablishing the data of the coordinate positions and the hole sizes of the two through holes, the machining coordinate system of the second machining fixture is ensured to be the same as the machining coordinate system of the first machining fixture, so that the change of the machining coordinate positions caused by the two clamping is eliminated.
Preferably, in step S5, the vertical machining center calls an end mill to perform rough and finish milling on the other opposite surface end face of the workpiece and the end face of the hole to be machined; and then a drill bit, a boring cutter, a reamer, an extrusion tap and a milling cutter are called for processing the hole.
Preferably, in step S6, the deburring processing for the machined surface includes cleaning burrs on the upper end surface and the lower end surface of the machined part, machining peripheral burrs, machining burrs on the inner cavity of the positioning hole and the bearing hole, and deburring edges of the bolt through hole.
Compared with the prior art, the invention has the beneficial effects that:
the high-precision part machining method provided by the invention uses a common precision machining center, a fourth shaft turntable is omitted, and the equipment cost is reduced; the constant temperature workshop is canceled, and the use cost is reduced; the forward and the one side of the workpiece are processed by a pair of clamps, so that the time from Kong Zhuaitai with the position requirement on one side to the processing on the other opposite side is reduced, the process beats are balanced, and the yield is improved; and positioning errors influenced by secondary clamping are eliminated, and the size precision of the hole with the position degree requirement on one surface of the workpiece is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an assembly of a first machining fixture and a workpiece according to the present invention;
FIG. 2 is a schematic view of an assembly of a second machining fixture and a workpiece according to the present invention;
FIG. 3 is a flow chart of the present invention;
reference numerals illustrate:
1-machined part, 2-first clamp base plate, 3-locating pin, 4-supporting cylinder subassembly, 5-clamping cylinder subassembly, 6-guide block, 7-second clamp base plate, 8-lathe gauge head.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. The embodiments of the present invention and the features in the embodiments may be combined with each other without collision. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and the described embodiments are merely some, rather than all, embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1 to 3, an embodiment of the present invention provides a high-precision part machining method, and a machining apparatus of the machining method includes a first machining fixture and a second machining fixture;
the first processing clamp comprises a first bottom plate and a first clamp substrate 2, a clearance through hole is formed in the first clamp substrate 2, a plurality of positioning pins 3, supporting cylinder assemblies 4, clamping cylinder assemblies 5 and guide blocks 6 are arranged along the edges of the clearance through hole, and the positions of the clamping cylinder assemblies 5 correspond to the positions of the positioning pins 3;
the second processing clamp comprises a second bottom plate and a second clamp substrate 7, a clearance through hole is formed in the second clamp substrate 7, a plurality of positioning pins 3, supporting cylinder assemblies 4, clamping cylinder assemblies 5 and guide blocks 6 are arranged along the edges of the clearance through hole, and the positions of the clamping cylinder assemblies 5 correspond to the positions of the positioning pins 3;
specifically, the positioning pin 3 adopts a floating conical structure;
the supporting cylinder assembly 4 comprises a supporting cylinder body, a supporting rod is arranged at the driving end of the supporting cylinder body, the supporting rod is obliquely arranged, the moving direction of the supporting rod faces to the avoidance through hole, the clamping cylinder assembly 5 comprises a clamping cylinder body, a support is arranged on the clamping cylinder body, a clamping rod is hinged to the support, one end of the clamping rod is connected with the driving end of the clamping cylinder body, and the other end of the clamping rod is located above the locating pin 3;
the first processing clamp is used for fixing the workpiece 1 and enabling one surface of the workpiece to face upwards, and the second processing clamp is used for fixing the workpiece 1 and enabling the other opposite surface of the workpiece to face upwards;
the processing method comprises the following steps:
s1, placing a first machining clamp and a second machining clamp on a workbench of a vertical machining center, and connecting a supporting cylinder assembly 4 and a clamping cylinder assembly 5 of the first machining clamp and the second machining clamp with a hydraulic system of the vertical machining center;
s2, placing the workpiece 1 at the position of a clearance through hole of the first processing clamp, positioning through a guide block 6 and a positioning pin 3, and then clamping through a supporting cylinder assembly 4 and a clamping cylinder assembly 5; specifically, before the workpiece 1 is placed in the first processing clamp, checking whether burrs on the locating surface and the clamping surface of the workpiece 1 are cleaned, checking whether a blank has defects such as cracks, under casting and the like, checking whether the flatness of the workpiece 1 is within 0.03, if the flatness is out of tolerance, correcting, and adjusting the oil pressure of the supporting cylinder assembly 4 and the oil pressure of the clamping cylinder assembly 5 to be 4-4.5MPa;
s3, machining one surface part of the workpiece 1 by the vertical machining center; specifically, the vertical machining center calls an end milling cutter to perform rough and finish milling on one end face of the machined part 1 and the end face of a hole to be machined; then a drill bit, a boring cutter, a reamer, an extrusion tap and a milling cutter are called for processing holes; the processing of the holes comprises the hole site with the position degree of 0.06;
s4, placing the workpiece 1 at the position of a clearance through hole of the second processing clamp, positioning through the guide block 6 and the positioning pin 3, and then clamping through the supporting cylinder assembly 4 and the clamping cylinder assembly 5;
s5, measuring and recording the two through holes Kong Zuobiao processed in the step S3 through a machine tool measuring head, and judging whether the two through holes are within a set position and hole size tolerance range, wherein the position tolerance of the through holes is +/-0.025:
if the vertical machining center is out of the set position tolerance range, alarming and stopping working;
if the machining coordinate system is within the set position tolerance range, the machining coordinate system of the second machining fixture is ensured to be identical with the machining coordinate system of the first machining fixture after reestablishing according to the coordinate positions of the two through hole sites and the data of the hole sizes, and the machining coordinate position change caused by two times of clamping is eliminated;
the vertical machining center processes the other opposite surface part of the workpiece 1, specifically, the vertical machining center calls an end milling cutter to perform rough milling and finish milling on the other opposite surface end surface of the workpiece 1 and the end surface of a hole to be processed; then a drill bit, a boring cutter, a reamer, an extrusion tap and a milling cutter are called for processing holes;
s6, deburring the machined surface; specifically, the deburring treatment for the machined surface comprises the steps of cleaning the upper end surface and the lower end surface of the machined part 1, machining peripheral burrs, machining positioning holes and bearing hole inner cavity burrs and bolt through hole edge burrs.
In summary, compared with the prior art, the method has the following advantages:
1. the high-precision part machining method provided by the invention uses a common precision machining center, cancels the fourth shaft turntable and reduces the equipment cost.
2. And a constant temperature workshop is canceled, so that the use cost is reduced.
3. The locating pin adopts a floating taper pin structure, so that the blank hole of the machined part is ensured to be automatically centered without gaps.
4. The workpiece is processed by a pair of clamps in the positive direction and the one side direction, the time from Kong Zhuaitai with the position requirement on one side to the processing on the other opposite side is reduced, the process beats are balanced, and the yield is improved.
5. And positioning errors influenced by secondary clamping are eliminated, and the size precision of the hole with the position degree requirement on one surface of the workpiece is ensured.
6. Adopt the pneumatic cylinder clamping structure of supporting cylinder subassembly, tight jar subassembly of clamp, guarantee to add the fixed stability of work piece in the course of working, guarantee machining precision, the guide block of setting up simultaneously, the casing of being convenient for gets into and keeps away the position through-hole region, the location and the fixed of convenient processing product.
The present invention is not limited to the preferred embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present invention are within the scope of the technical proposal of the present invention.
Claims (7)
1. The processing device of the processing method comprises a first processing clamp and a second processing clamp;
the first processing clamp comprises a first bottom plate and a first clamp substrate, a clearance through hole is formed in the first clamp substrate, a plurality of positioning pins, supporting cylinder assemblies, clamping cylinder assemblies and guide blocks are arranged along the edges of the clearance through hole, and the positions of the clamping cylinder assemblies correspond to the positions of the positioning pins;
the second processing clamp comprises a second bottom plate and a second clamp substrate, a clearance through hole is formed in the second clamp substrate, a plurality of positioning pins, supporting cylinder assemblies, clamping cylinder assemblies and guide blocks are arranged along the edges of the clearance through hole, and the positions of the clamping cylinder assemblies correspond to the positions of the positioning pins;
the first processing clamp is used for fixing a workpiece and enabling one surface of the workpiece to face upwards, and the second processing clamp is used for fixing the workpiece and enabling the other opposite surface of the workpiece to face upwards;
the processing method comprises the following steps:
s1, placing a first machining clamp and a second machining clamp on a workbench of a vertical machining center, and connecting a supporting cylinder assembly and a clamping cylinder assembly of the first machining clamp and the second machining clamp with a hydraulic system of the vertical machining center;
s2, placing a machined part at the position of a clearance through hole of the first machining clamp, positioning through a guide block and a positioning pin, and then clamping through a supporting cylinder assembly and a clamping cylinder assembly;
s3, machining one surface part of the workpiece by the vertical machining center;
the vertical machining center calls an end milling cutter to perform rough milling and finish milling on one end face of a machined part and the end face of a hole to be machined; then a drill bit, a boring cutter, a reamer, an extrusion tap and a milling cutter are called for processing holes;
s4, placing the machined part at the position of the avoidance through hole of the second machining clamp, positioning through the guide block and the positioning pin, and then clamping through the supporting cylinder assembly and the clamping cylinder assembly;
s5, measuring and recording the two through holes Kong Zuobiao processed in the step S3 through a machine tool measuring head, and judging whether the two through holes are within the set position and hole size tolerance range or not:
if the vertical machining center is out of the set position tolerance range, alarming and stopping working;
if the machining coordinate system is within the set position tolerance range, the machining coordinate system is reestablished through the data of the positions and the hole sizes of the two through holes, after reestablishing, the machining coordinate system of the second machining fixture is ensured to be identical with the machining coordinate system of the first machining fixture, and the position change of the machining coordinate caused by two times of clamping is eliminated;
the vertical machining center is used for machining the other opposite surface part of the machined part;
s6, deburring the machined surface.
2. The method of claim 1, wherein the locating pin is of a floating cone type structure.
3. The high-precision part machining method according to claim 1, wherein the supporting cylinder assembly comprises a supporting cylinder body, a supporting rod is arranged at the driving end of the supporting cylinder body, the supporting rod is obliquely arranged, the moving direction of the supporting rod faces to the avoidance through hole, the clamping cylinder assembly comprises a clamping cylinder body, a support is arranged on the clamping cylinder body, a clamping rod is hinged to the support, one end of the clamping rod is connected with the driving end of the clamping cylinder body, and the other end of the clamping rod is located above the locating pin.
4. The method according to claim 1, wherein in step S2, before the workpiece is placed on the first machining jig, it is checked whether the locating surface and the clamping surface of the workpiece are cleaned, whether the blank has cracks and under-cast defects, whether the flatness of the workpiece is within 0.03, if the flatness is out of tolerance, correction is required, and the oil pressure of the supporting cylinder assembly and the clamping cylinder assembly is adjusted to 4-4.5MPa.
5. The high-precision part machining method according to claim 1, wherein in step S3, the machining of the hole includes a hole position having a position degree of 0.06, and in step S5, the position tolerance of the through hole is ±0.025.
6. The method according to claim 1, wherein in step S5, the vertical machining center calls an end mill to perform rough and finish milling on the other opposite surface end face of the workpiece and the end face of the hole to be machined; and then a drill bit, a boring cutter, a reamer, an extrusion tap and a milling cutter are called for processing the hole.
7. The method according to claim 1, wherein in step S6, the deburring of the machined surface includes cleaning the upper end surface, the lower end surface, the machined peripheral burrs, the machined locating hole and bearing hole cavity burrs, and the edge burrs of the bolt through hole.
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| CN202110698567.0A CN113352058B (en) | 2021-06-23 | 2021-06-23 | High-precision part machining method |
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| CN202110698567.0A CN113352058B (en) | 2021-06-23 | 2021-06-23 | High-precision part machining method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108890227A (en) * | 2018-07-06 | 2018-11-27 | 江西洪都航空工业集团有限责任公司 | A kind of H-shaped material numerical-control processing method |
| CN110369967A (en) * | 2019-08-14 | 2019-10-25 | 福建胜亚模具有限公司 | A kind of process for machining of high-precision workpiece |
| CN111660070A (en) * | 2020-06-23 | 2020-09-15 | 湛江德利车辆部件有限公司 | Oil pan and machining method thereof |
| CN111660071A (en) * | 2020-06-30 | 2020-09-15 | 湛江德利车辆部件有限公司 | Processing technology of EGR (exhaust gas recirculation) flange |
| CN112935723A (en) * | 2021-02-03 | 2021-06-11 | 湛江德利车辆部件有限公司 | Method for manufacturing thermostat assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2505497A (en) * | 2012-09-03 | 2014-03-05 | Rolls Royce Plc | Method of determining a tool path for machining a component |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108890227A (en) * | 2018-07-06 | 2018-11-27 | 江西洪都航空工业集团有限责任公司 | A kind of H-shaped material numerical-control processing method |
| CN110369967A (en) * | 2019-08-14 | 2019-10-25 | 福建胜亚模具有限公司 | A kind of process for machining of high-precision workpiece |
| CN111660070A (en) * | 2020-06-23 | 2020-09-15 | 湛江德利车辆部件有限公司 | Oil pan and machining method thereof |
| CN111660071A (en) * | 2020-06-30 | 2020-09-15 | 湛江德利车辆部件有限公司 | Processing technology of EGR (exhaust gas recirculation) flange |
| CN112935723A (en) * | 2021-02-03 | 2021-06-11 | 湛江德利车辆部件有限公司 | Method for manufacturing thermostat assembly |
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| CN113352058A (en) | 2021-09-07 |
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