CN113352058A - High-precision part machining method - Google Patents
High-precision part machining method Download PDFInfo
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- CN113352058A CN113352058A CN202110698567.0A CN202110698567A CN113352058A CN 113352058 A CN113352058 A CN 113352058A CN 202110698567 A CN202110698567 A CN 202110698567A CN 113352058 A CN113352058 A CN 113352058A
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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 processing method, which uses a common precision processing center, cancels a fourth shaft turntable and reduces the equipment cost; a constant-temperature workshop is cancelled, so that the use cost is reduced; the front side and the back side of the workpiece are respectively machined by using a pair of clamps, so that the time for machining the other opposite side by rotating the hole rotating table with one side having the requirement on the position degree is shortened, the working procedure beat is balanced, and the yield is improved; the positioning error caused by secondary clamping influence is 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
The state of the art: the front and back face processing holes of the high-precision workpiece have the requirement of position accuracy, and the position accuracy reference is the processing holes of the workpiece in the same face direction. The traditional processing method comprises the following steps: the machining procedure of the other opposite surface uses one machining center to machine all parts (without holes with position requirement) of the other opposite surface of the workpiece, the machining procedure of one surface uses the other high-precision machining center and the fourth shaft rotary table, the workpiece uses the machining procedure machining hole of the other opposite surface as positioning, the machining surface is used for supporting and is placed on a fourth shaft rotary table clamp, the reference hole of the other opposite surface of the machined workpiece has the hole with the position requirement and other parts, the rotary table rotates 180 degrees and then machines the hole with the position requirement on the one surface, the reference hole is machined once, and the hole with the position requirement on the right surface and the hole with the position requirement on the other surface are machined, so that the size precision is ensured.
The method has the following defects: 1. the machining center and the fourth-axis turntable are high in precision and stability, and high in equipment cost due to the fact that well-known brand equipment is often selected; 2. the environment temperature change affects the processing precision of the equipment, 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. the hole with the requirement on the position degree on one surface and the hole with the requirement on the position degree on the other opposite surface are processed in one process, so that the processing beat of one process of the workpiece is fast, the processing beat of the other opposite surface is slow, the beat is not uniform, and the productivity is low; 4. if the fourth shaft rotary table is omitted in workpiece machining, and the front surface and the back surface of the workpiece are machined by using a pair of fixtures, the machining size precision of a hole with a position degree requirement on one surface of the workpiece is influenced by the secondary clamping and positioning error.
Disclosure of Invention
In order to overcome the above disadvantages of the prior art, the present invention provides a method for processing a high precision part, which aims to solve the existing technical problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-precision part processing method is characterized in that 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 base plate, a position avoiding through hole is formed in the first clamp base plate, a plurality of positioning pins, a supporting cylinder assembly, a clamping cylinder assembly and a guide block are arranged along the edge of the position avoiding through hole, and the position of the clamping cylinder assembly corresponds to the position of the positioning pins;
the second processing clamp comprises a second bottom plate and a second clamp base plate, a position avoiding through hole is formed in the second clamp base plate, a plurality of positioning pins, a supporting cylinder assembly, a clamping cylinder assembly and a guide block are arranged along the edge of the position avoiding through hole, and the position of the clamping cylinder assembly corresponds to the position of the positioning pins;
the first processing clamp is used for fixing a workpiece and enabling one side of the workpiece to face upwards, and the second processing clamp is used for fixing the workpiece and enabling the other opposite side of the workpiece to face upwards;
the processing method comprises the following steps:
s1, placing the first machining clamp and the second machining clamp on a workbench of the vertical machining center, and connecting the supporting cylinder assembly and the clamping cylinder assembly of the first machining clamp and the second machining clamp with a hydraulic system of the vertical machining center;
s2, placing the machined part at the position of the avoiding through hole of the first machining clamp, positioning the machined part through the guide block and the positioning pin, and then clamping the machined part through the supporting cylinder assembly and the clamping cylinder assembly;
s3, processing one surface of the workpiece by the vertical processing center;
s4, placing the machined part at the position of the avoiding through hole of the second machining clamp, positioning the machined part through the guide block and the positioning pin, and then clamping the machined part through the supporting cylinder assembly and the clamping cylinder assembly;
and S5, measuring and recording the coordinates of the two through holes machined in the step S3 by a machine tool measuring head, and judging whether the coordinates are within the set position and hole size tolerance range:
if the position tolerance is out of the set position tolerance range, the vertical machining center gives an alarm and stops working;
if the position tolerance range is within the set position tolerance range, a machining coordinate system is reestablished through the data of the positions and the hole sizes of the two through holes;
the vertical machining center machines the other opposite surface part of the machined part;
and S6, deburring the machined surface.
Preferably, the positioning pin is of a floating cone type structure.
Preferably, support the cylinder subassembly including supporting the cylinder body the drive end that supports the cylinder body is equipped with the bracing piece, the bracing piece slope sets up, and the position through-hole is kept away to the direction of motion orientation of bracing piece, press from both sides tight cylinder subassembly including pressing from both sides tight cylinder body, be equipped with the support on pressing from both sides tight cylinder body, it has clamping rod to articulate on the support, clamping rod's one end is connected with the drive end that presss from both sides tight cylinder body, clamping rod's the other end is located the top of locating pin.
Preferably, in step S2, before the workpiece is placed in the first machining jig, the positioning surface and the clamping surface of the workpiece are inspected for cleaning, the blank is inspected for defects such as cracks and undercasting, the flatness of the workpiece is inspected for being within 0.03, if out of tolerance, correction is required, and the oil pressure of the support cylinder assembly and the clamping cylinder assembly is adjusted to 4-4.5 MPa.
Preferably, in step S3, the vertical machining center calls an end mill to perform rough milling and finish milling on one end face of the workpiece and the end face of the hole to be machined; and then, machining holes by using a drill, a boring cutter, a reamer, an extrusion tap and a milling cutter.
Preferably, the positional degree of the hole having the positional degree requirement is 0.06 in step S3, and the positional tolerance of the through-hole is ± 0.025 in step S5.
Preferably, in step S5, the coordinates of the two through holes machined in step S3 are measured and recorded by the machine tool probe, and after the coordinates are re-established based on the coordinate positions of the two through hole positions and the data of the hole size, the machining coordinate system of the second machining jig is ensured to be the same as the machining coordinate system of the first machining jig, and the change in the machining coordinate position due to the two times of clamping is eliminated.
Preferably, in step S5, the vertical machining center calls an end mill to perform rough milling and finish milling on the other opposite end surface of the workpiece and the end surface of the hole to be machined; and then, machining holes by using a drill, a boring cutter, a reamer, an extrusion tap and a milling cutter.
Preferably, in step S6, the deburring processing on the machined surface includes cleaning the machined peripheral burrs on the upper end surface and the lower end surface of the machined part, the machined locating hole and bearing hole inner cavity burrs, and the bolt via hole edge burrs.
Compared with the prior art, the invention has the beneficial effects that:
the high-precision part processing method provided by the invention uses a common precision processing center, a fourth shaft turntable is omitted, and the equipment cost is reduced; a constant-temperature workshop is cancelled, so that the use cost is reduced; the front side and the back side of the workpiece are respectively machined by using a pair of clamps, so that the time for machining the other opposite side by rotating the hole rotating table with one side having the requirement on the position degree is shortened, the working procedure beat is balanced, and the yield is improved; the positioning error caused by secondary clamping influence is 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 needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of the assembly of a first machining fixture and a workpiece according to the present invention;
FIG. 2 is a schematic view of the second machining fixture of the present invention assembled with a workpiece;
FIG. 3 is a flow chart of the present invention;
description of reference numerals:
1-a workpiece, 2-a first clamp substrate, 3-a positioning pin, 4-a support cylinder assembly, 5-a clamping cylinder assembly, 6-a guide block, 7-a second clamp substrate and 8-a machine tool measuring head.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are 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 processing method, where a processing apparatus of the processing method includes a first processing fixture and a second processing fixture;
the first machining clamp comprises a first bottom plate and a first clamp base plate 2, a position avoiding through hole is formed in the first clamp base plate 2, a plurality of positioning pins 3, a supporting cylinder assembly 4, a clamping cylinder assembly 5 and a guide block 6 are arranged along the edge of the position avoiding through hole, and the position of the clamping cylinder assembly 5 corresponds to the position of the positioning pins 3;
the second processing clamp comprises a second bottom plate and a second clamp base plate 7, a position avoiding through hole is formed in the second clamp base plate 7, a plurality of positioning pins 3, a supporting cylinder assembly 4, a clamping cylinder assembly 5 and a guide block 6 are arranged along the edge of the position avoiding through hole, and the position of the clamping cylinder assembly 5 corresponds to the position of the positioning pins 3;
specifically, the positioning pin 3 adopts a floating cone type 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 arranged in an inclined mode, 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 positioning 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 the first machining clamp and the second machining clamp on a workbench of the vertical machining center, and connecting the supporting cylinder assembly 4 and the 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 the avoiding through hole of the first machining 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; specifically, before the workpiece 1 is placed in the first processing fixture, whether the burrs on the positioning surface and the clamping surface of the workpiece 1 are cleaned up or not is checked, whether the blank has defects such as cracks and undercasting or not is checked, whether the flatness of the workpiece 1 is within 0.03 or not is checked, if out of tolerance, correction is needed, and meanwhile, the oil pressure of the supporting cylinder assembly 4 and the oil pressure of the clamping cylinder assembly 5 are adjusted to be 4-4.5 MPa;
s3, processing one surface of the workpiece 1 by the vertical processing center; specifically, an end face milling cutter is called by a vertical machining center, and rough and finish milling is carried out on one end face of a machined part 1 and the end face of a hole to be machined; then, a drill, a boring cutter, a reamer, an extrusion tap and a milling cutter are used for processing holes; the machining of the holes comprises hole positions with the position degree of 0.06;
s4, placing the workpiece 1 at the position of the avoiding through hole of the second machining 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;
and S5, measuring and recording the coordinates of the two through holes machined in the step S3 by a machine tool measuring head, and judging whether the coordinates are within the set position and hole size tolerance range, wherein the position tolerance of the through holes is +/-0.025:
if the position tolerance is out of the set position tolerance range, the vertical machining center gives an alarm and stops working;
if the position of the second processing fixture is within the set position tolerance range, according to the coordinate positions of the two through hole positions and the data of the hole sizes, after reestablishment, the processing coordinate system of the second processing fixture is ensured to be the same as the processing coordinate system of the first processing fixture, and the processing coordinate position change caused by two times of clamping is eliminated;
the vertical machining center processes the other opposite surface part of the machined part 1, and concretely, the vertical machining center calls an end face milling cutter to perform rough and finish milling on the other opposite surface end face of the machined part 1 and the end face of the hole to be machined; then, a drill, a boring cutter, a reamer, an extrusion tap and a milling cutter are used for processing holes;
s6, deburring the machined surface; specifically, the deburring treatment of the machined surface comprises the steps of cleaning machined peripheral burrs on the upper end surface and the lower end surface of the machined part 1, and burrs on the machined positioning hole, the machined inner cavity of the bearing hole and the machined edge of the through hole of the bolt.
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 a fourth shaft turntable and reduces the equipment cost.
2. And a constant-temperature workshop is cancelled, so that the use cost is reduced.
3. The positioning pin adopts a floating conical pin structure, and ensures that a blank hole of a workpiece is automatically centered without a gap.
4. The right side and the one side of the workpiece are respectively machined by using a pair of clamps, so that the time for machining the other opposite side by rotating the hole rotating table with the requirement on the position degree on one side is reduced, the working procedure beat is balanced, and the yield is improved.
5. The positioning error caused by secondary clamping influence is eliminated, and the size precision of the hole with the position degree requirement on one surface of the workpiece is ensured.
6. The hydraulic cylinder clamping structure of the supporting cylinder assembly and the clamping cylinder assembly is adopted, the stability of workpiece fixing in the machining process is guaranteed, the machining precision is guaranteed, the guide block is arranged, the shell can conveniently enter the avoiding through hole area, and positioning and fixing of a machined product are facilitated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. A high-precision part processing method is characterized in that 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 base plate, a position avoiding through hole is formed in the first clamp base plate, a plurality of positioning pins, a supporting cylinder assembly, a clamping cylinder assembly and a guide block are arranged along the edge of the position avoiding through hole, and the position of the clamping cylinder assembly corresponds to the position of the positioning pins;
the second processing clamp comprises a second bottom plate and a second clamp base plate, a position avoiding through hole is formed in the second clamp base plate, a plurality of positioning pins, a supporting cylinder assembly, a clamping cylinder assembly and a guide block are arranged along the edge of the position avoiding through hole, and the position of the clamping cylinder assembly corresponds to the position of the positioning pins;
the first processing clamp is used for fixing a workpiece and enabling one side of the workpiece to face upwards, and the second processing clamp is used for fixing the workpiece and enabling the other opposite side of the workpiece to face upwards;
the processing method comprises the following steps:
s1, placing the first machining clamp and the second machining clamp on a workbench of the vertical machining center, and connecting the supporting cylinder assembly and the clamping cylinder assembly of the first machining clamp and the second machining clamp with a hydraulic system of the vertical machining center;
s2, placing the machined part at the position of the avoiding through hole of the first machining clamp, positioning the machined part through the guide block and the positioning pin, and then clamping the machined part through the supporting cylinder assembly and the clamping cylinder assembly;
s3, processing one surface of the workpiece by the vertical processing center;
s4, placing the machined part at the position of the avoiding through hole of the second machining clamp, positioning the machined part through the guide block and the positioning pin, and then clamping the machined part through the supporting cylinder assembly and the clamping cylinder assembly;
and S5, measuring and recording the coordinates of the two through holes machined in the step S3 by a machine tool measuring head, and judging whether the coordinates are within the set position and hole size tolerance range:
if the position tolerance is out of the set position tolerance range, the vertical machining center gives an alarm and stops working;
if the position tolerance range is within the set position tolerance range, a machining coordinate system is reestablished through the data of the positions and the hole sizes of the two through holes;
the vertical machining center machines the other opposite surface part of the machined part;
and S6, deburring the machined surface.
2. A high-precision part processing method according to claim 1, wherein the positioning 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 a driving end of the supporting cylinder body, the supporting rod is arranged in an inclined mode, the moving direction of the supporting rod faces the avoiding 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 positioning pin.
4. The method of processing a high-precision part according to claim 1, wherein in step S2, before the workpiece is placed in the first processing jig, the positioning surface and the clamping surface of the workpiece are inspected for burr removal, the blank is inspected for defects such as cracks and undercasting, the flatness of the workpiece is inspected for defects such as 0.03 or less, and if out of tolerance, correction is required, and the oil pressures of the support cylinder assembly and the clamping cylinder assembly are adjusted to 4 to 4.5 MPa.
5. The method for processing a high-precision part according to claim 1, wherein in step S3, the vertical machining center calls up an end mill to perform rough and finish milling on one end face of the workpiece and the end face of the hole to be processed; and then, machining holes by using a drill, a boring cutter, a reamer, an extrusion tap and a milling cutter.
6. The method of claim 5, wherein the positional tolerance of the hole having the positional requirement is 0.06 in step S3, and the positional tolerance of the through-hole is ± 0.025 in step S5.
7. A method for processing a high-precision part according to claim 6, wherein in step S5, the coordinates of the two through holes processed in step S3 are measured and recorded by a machine tool probe, and after the coordinates of the two through hole positions and the data of the hole size are rebuilt, the processing coordinate system of the second processing jig is ensured to be the same as the processing coordinate system of the first processing jig, and the change of the processing coordinate position caused by the two clamping operations is eliminated.
8. The method for processing a high-precision part according to claim 1, wherein in step S5, the vertical machining center calls up an end mill to perform rough and finish milling on the other end face of the opposite side of the workpiece and the end face of the hole to be processed; and then, machining holes by using a drill, a boring cutter, a reamer, an extrusion tap and a milling cutter.
9. The method for processing the high-precision part according to claim 1, wherein in step S6, the deburring treatment for the processing surface comprises cleaning the processing peripheral burrs of the upper end surface and the lower end surface of the workpiece, the processing inner cavity burrs of the positioning hole and the bearing hole and the processing edge burrs of the bolt through hole.
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| 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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2021
- 2021-06-23 CN CN202110698567.0A patent/CN113352058B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20140059856A1 (en) * | 2012-09-03 | 2014-03-06 | Rolls-Royce Plc | Machining process and apparatus for machining |
| 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 |
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