CN114083243A - A kind of thin-walled shell processing technology - Google Patents

A kind of thin-walled shell processing technology Download PDF

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Publication number
CN114083243A
CN114083243A CN202111480338.8A CN202111480338A CN114083243A CN 114083243 A CN114083243 A CN 114083243A CN 202111480338 A CN202111480338 A CN 202111480338A CN 114083243 A CN114083243 A CN 114083243A
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finishing
parts
turning
semi
positioning
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CN202111480338.8A
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陈爱芹
孙建军
张建伟
刘占刚
杨秀奇
毕金林
张亿
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Hebei Yanxing Machinery Co ltd
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Hebei Yanxing Machinery Co ltd
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Priority to CN202111480338.8A priority Critical patent/CN114083243A/en
Publication of CN114083243A publication Critical patent/CN114083243A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06—Work-clamping means
    • B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
    • B23Q3/065—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding workpieces being specially deformable, e.g. made from thin-walled or elastic material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

The invention discloses a thin-wall shell processing technology, which comprises the following specific steps: A. blanking, B, rough turning of an outer circle and an inner hole, C, heat treatment, D, rough turning and post-turning positioning, E, primary semi-finish turning, F, stress removal, G, primary semi-finish turning and post-turning positioning, H, secondary semi-finish turning, I and finish turning, and finish turning is carried out on a secondary finish-machined part to meet the tolerance and finish requirement of the part; J. and milling a molded surface, clamping the part through a special fixture, and milling the part into the molded surface. The thin-wall shell processing technology can process and produce the thin-wall shells in batches, and the qualification rate is improved to more than 90% from 50% in the initial trial production.

Description

Thin-wall shell machining process
Technical Field
The invention particularly relates to a thin-wall shell machining process, and belongs to the technical field of thin-wall shell machining.
Background
As shown in fig. 1, the part is a thin-walled cylinder part, as can be seen from fig. 1, the part has a thin wall, a large machining allowance, a conical surface in appearance, and a poor machining standard, in particular, the cylindricity of the right-end inner hole and the excircle is not easy to guarantee, and the corresponding dimensional tolerance is not guaranteed, and the part is made of an aluminum alloy material, and is easy to deform during machining and difficult to control in dimension, so that the machining difficulty needs to be technically checked, and qualified parts are produced, and the requirements of product assembly and subsequent application are met.
Disclosure of Invention
In order to solve the problems, the invention provides a thin-wall shell processing technology, which is characterized in that research and development and experiments are carried out for a plurality of times from the size of the processing allowance to the clamping mode, a reasonable process file is finally formed, and a breakthrough is made in the thin-wall shell processing technology.
The invention discloses a thin-wall shell processing technology, which comprises the following specific steps:
A. blanking, namely blanking by selecting an aluminum alloy material according to the size of a product to obtain a part blank;
B. roughly turning an outer circle and an inner hole, clamping and positioning a part blank by using a lathe fixture, and after clamping is completed, roughly turning the outer circle and the inner hole on the part blank by using a lathe to obtain a rough part, reserving allowance for finish turning of the rough part, wherein the diameter of the inner hole is 1 mm, and the diameter of the outer circle is 2 mm;
C. performing heat treatment, namely performing first heat treatment on the rough part finished in the previous procedure to eliminate residual stress generated in the material; in order to remove the influence of stress and stabilize the machining size, a heat treatment process is added just after rough machining, a small batch of parts are trial-manufactured, deformation is reduced compared with the prior part, and the qualified rate is doubled.
D. Positioning by turning after rough turning, and positioning the rough part subjected to heat treatment by turning to obtain a clamping and positioning surface of the primary semi-finish turning fixture;
E. primary semi-finish turning, namely clamping a lathe fixture to a primary finish turning fixture clamping positioning surface, and performing primary semi-finish turning to obtain a primary semi-finish-finished part, wherein the allowance of the primary semi-finish-finished part is reserved for secondary semi-finish turning, and the single edge of the excircle of an inner hole is 0.2 mm;
F. stress removal, namely performing stress removal heat treatment on the workpiece finished in the previous procedure to eliminate residual stress generated in the material; after semi-finish turning, stress relief treatment is added once again, a small batch of parts are trial-manufactured, the machining size tends to be stable, but a small number of unqualified products still appear, and the whole machining process parameters are adjusted for the small number of unqualified products, so that the yield is greatly improved.
G. Turning and positioning after primary semi-finish turning, and turning and positioning the primary semi-finish machined part subjected to heat treatment to obtain a secondary semi-finish turning clamp fastening positioning surface;
H. secondary semi-finish turning, namely clamping a lathe fixture to a secondary semi-finish turning fixture clamping positioning surface, and performing secondary semi-finish turning to obtain a secondary semi-finish-finished part, wherein the secondary semi-finish-finished part is left with allowance for final finish turning amount, and the single side is 0.2 mm;
I. finish turning, wherein the secondary semi-finish machining part is finish turned to meet the tolerance and finish requirement of the part; the machining allowance is changed, the size change is determined to be large, and the most reasonable process parameters are obtained by adjusting the machining allowance between each process, namely the process parameters have the highest yield and the best product stability under the same clamping and stress relieving conditions.
J. The method comprises the steps of milling a molded surface, clamping parts through a special clamp, milling the parts into the molded surface, trying different clamping modes when the best machining allowance is obtained, designing a plurality of clamping auxiliary tools, finally finding the best clamping method through practical operation experiments, wherein the size connection among all working procedures tends to be reasonable, and the machining quality stably rises.
Further, before the primary semi-finish machining, semi-finish machining is carried out on the inner hole of the large end of the rough part; before the secondary semi-finish machining, the primary semi-finish machining part is subjected to finish thread machining; and before the milling forming surface, machining holes and grooves on the part in a machining center.
Further, the milling profile further comprises the procedures of cutter mark trimming and thread tapping.
Furthermore, the primary semi-finish turning, the secondary semi-finish turning and the finish turning all comprise finish turning inner holes and finish turning shapes.
And further, before the appearance finish turning process, laser marking is carried out on the part.
Furthermore, the special fixture for milling the molded surface comprises a chuck, and cushion blocks are arranged at intervals on the outer edge of the bottom surface of the chuck; a positioning block is fixed on the inner surface of the clamping jaw of the chuck; the inner surface of the positioning block is of a cambered surface structure attached to the outer wall of the part; at least one the locating piece top spin has connect the reference column, and this set of anchor clamps utilizes current chuck, has solved and has pressed from both sides tight problem, utilizes current chuck, increases the cushion and highly increases, increases the locating piece, has realized the location problem to it realizes that the circumference is spacing to set up the reference column, and this frock can be made and put into production in short time, has striven for the time for scientific research trial-manufacturing.
Compared with the prior art, the thin-wall shell processing technology can process and produce the thin-wall shells in batches, and the qualification rate is improved to more than 90% from 50% in the initial trial production.
Drawings
FIG. 1 is a schematic diagram of a machined workpiece structure according to the present invention.
FIG. 2 is a schematic view of the overall process flow of example 1 of the present invention.
FIG. 3 is a schematic process flow diagram of example 1 of the present invention.
Fig. 4 is a schematic structural view of the special fixture of the present invention.
FIG. 5 is a schematic cross-sectional view of FIG. 4 according to the present invention.
Detailed Description
Example 1:
the thin-wall shell machining process shown in fig. 2 and 3 specifically comprises the following steps:
A. blanking, namely blanking by selecting an aluminum alloy material according to the size of a product to obtain a part blank;
B. roughly turning an outer circle and an inner hole, clamping and positioning the part blank by using a lathe fixture, and after clamping is completed, roughly turning the outer circle and the inner hole on the part blank by using a lathe to obtain a rough part of the part, wherein the allowance of the rough part of the product is reserved for finish turning; the diameter of the inner hole is 1 mm, and the diameter of the outer circle is 2 mm;
C. performing heat treatment, namely performing first heat treatment on the rough part finished in the previous procedure to eliminate residual stress generated in the material; in order to remove the influence of stress and stabilize the machining size, a heat treatment process is added just after rough machining, a small batch of parts are trial-manufactured, deformation is reduced compared with the prior part, and the qualified rate is doubled.
D. Positioning by rough turning, and positioning the rough part subjected to heat treatment by turning to obtain a clamping and positioning surface of the primary finish turning fixture;
E. primary semi-finish turning, namely clamping a lathe fixture to a clamping and positioning surface of a primary finish turning fixture, and performing primary semi-finish turning to obtain a primary finish-machined part, wherein the allowance of the primary finish-machined part is reserved for secondary finish turning, and the single edge of the excircle of an inner hole is 0.2 mm;
F. stress removal, namely performing stress removal heat treatment on the workpiece finished in the previous procedure to eliminate residual stress generated in the material; after semi-finish turning, stress relief treatment is added once again, a small batch of parts are trial-manufactured, the machining size tends to be stable, but a small number of unqualified products still appear, and the whole machining process parameters are adjusted for the small number of unqualified products, so that the yield is greatly improved.
G. Turning and positioning after primary semi-finish turning, and turning and positioning the primary finish-machined part subjected to heat treatment to obtain a secondary finish-turned clamp fastening positioning surface;
H. secondary semi-finish turning, namely clamping a lathe fixture to a secondary finish turning fixture clamping positioning surface, and performing secondary semi-finish turning to obtain a secondary finish-machined part, wherein the secondary finish-machined part is left with allowance for final finish turning amount, and the single side is 0.2 mm;
I. finish turning, wherein the secondary finish-machined part is finish-turned to meet the tolerance and finish requirement of the part; the machining allowance is changed, the size change is determined to be large, and the most reasonable process parameters are obtained by adjusting the machining allowance between each process, namely the process parameters have the highest yield and the best product stability under the same clamping and stress relieving conditions.
J. The method comprises the steps of milling a molded surface, clamping parts through a special clamp, milling the parts into the molded surface, trying different clamping modes when the best machining allowance is obtained, designing a plurality of clamping auxiliary tools, finally finding the best clamping method through practical operation experiments, wherein the size connection among all working procedures tends to be reasonable, and the machining quality stably rises.
Before the primary semi-finish machining, firstly, semi-finish machining is carried out on a large-end inner hole of a rough part; before the secondary semi-finish machining, the primary finish machining part is subjected to finish machining of threads; and before the milling forming surface, machining holes and grooves on the part in a machining center.
The milling of the profile further comprises the working procedures of cutter mark trimming and thread tapping.
And the primary semi-finish turning, the secondary semi-finish turning and the finish turning all comprise finish turning inner holes and finish turning shapes.
Before the appearance finish turning process, the parts are subjected to laser marking.
As shown in fig. 4 and 5, the special fixture for milling the profile comprises a chuck 1, and cushion blocks 2 are arranged at intervals on the outer edge of the bottom surface of the chuck 1; a positioning block 3 is fixed on the inner surface of a clamping jaw of the chuck 1; the inner surface of the positioning block 3 is of a cambered surface structure attached to the outer wall of the part K; at least one locating piece 3 top spin has connect reference column 4, and this set of anchor clamps utilizes current chuck, has solved and has pressed from both sides tight problem, utilizes current chuck, increases the cushion and highly increases, increases the locating piece, has realized the location problem to it is spacing to set up the reference column and realize the circumference, and this frock can be made and put into production in short time, has striven for the time for scientific research trial-manufacturing.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.

Claims (6)

1.一种薄壁壳体加工工艺，其特征在于：所述工艺具体如下：1. a thin-walled shell processing technology, is characterized in that: described technology is specifically as follows: A、下料，根据产品尺寸，选用铝合金材料进行下料，得到零件坯料；A. Blanking, according to the size of the product, select aluminum alloy materials for blanking to obtain part blanks; B、粗车外圆和内孔，采用车床夹具对零件坯料进行夹持定位，完成装夹后，车床对零件坯料进行粗车外圆和内孔加工，得到零件粗件，产品粗件留取余量给精车，内孔直径1毫米，外圆直径2毫米；B. Rough turning the outer circle and inner hole, using the lathe fixture to clamp and position the part blank. After the clamping is completed, the lathe rough-turns the outer circle and inner hole of the part blank to obtain the rough part of the part, and the rough part of the product is reserved. The allowance is given to the finishing machine, the diameter of the inner hole is 1 mm, and the diameter of the outer circle is 2 mm; C、热处理，对上一工序完成的零件粗件进行第一次热处理，消除材料内部产生的残余应力；C. Heat treatment, the first heat treatment is performed on the rough parts completed in the previous process to eliminate the residual stress generated inside the material; D、粗车后车定位，对完成热处理的零件粗件进行车定位，得到一次精车夹具加紧定定位面；D. Positioning after rough turning, and positioning the rough parts of the heat-treated parts to obtain a finishing jig to tighten the positioning surface; E、一次半精车，将车床夹具装夹到一次精车夹具加紧定定位面，并进行一次半精车加工，得到一次精加工零件，一次精加工零件留取余量给二次精车，内孔外圆单边0.2毫米；E. One-time semi-finishing, clamp the lathe fixture to the first-finishing fixture to tighten the fixed positioning surface, and perform one-time semi-finishing machining to obtain the first-finishing parts, and reserve the allowance for the second-finishing for the first-finishing parts. The outer circle of the inner hole is 0.2 mm on one side; F、去应力，对上一工序完成的工件进行去应力热处理，消除材料内部产生的残余应力；F. Stress relief, perform stress relief heat treatment on the workpiece completed in the previous process to eliminate the residual stress generated inside the material; G、一次半精车后车定位，对完成热处理的一次精加工零件进行车定位，得到二次精车夹具加紧定定位面；G. Positioning after one-time semi-finishing, positioning the first-finished parts after heat treatment, and obtaining a second-finishing fixture to tighten the positioning surface; H、二次半精车，将车床夹具装夹到二次精车夹具加紧定定位面，并进行二次半精车加工，得到二次精加工零件，二次精加工零件留取余量给最终精车量，单边0.2毫米；H. Secondary semi-finishing turning, clamp the lathe fixture to the secondary finishing fixture to tighten the positioning surface, and carry out secondary semi-finishing processing to obtain secondary finishing parts, and reserve the allowance for the secondary finishing parts to Final finish, 0.2mm on one side; I、精车，对二次精加工零件进行精车，满足零件的公差和光洁度要求；I. Fine turning, fine turning the secondary finishing parts to meet the tolerance and finish requirements of the parts; J、铣成型面，通过专用夹具对零件进行装夹，并对零件进行铣成型面。J. Milling the forming surface, clamping the parts through a special fixture, and milling the forming surface of the parts. 2.根据权利要求1所述的薄壁壳体加工工艺，其特征在于：所述一次半精车前，先对零件粗件进行半精车大端内孔；所述二次半精车前，先对一次精加工零件进行精车螺纹；所述铣成型面前，在加工中心对零件加工孔和槽。2. The thin-walled shell processing process according to claim 1, characterized in that: before the first semi-finishing turning, the rough parts of the parts are semi-finishing the large end inner hole; before the second semi-finishing turning , firstly, finish threading on a finishing part; before the milling and forming, the parts are machined with holes and grooves in the machining center. 3.根据权利要求1所述的薄壁壳体加工工艺，其特征在于：所述铣成型面还包括修接刀痕和攻螺纹工序。3 . The thin-walled shell processing process according to claim 1 , wherein the milling and forming surface further includes a process of repairing tool marks and tapping threads. 4 . 4.根据权利要求1所述的薄壁壳体加工工艺，其特征在于：所述一次半精车、二次半精车和精车均包括精车内孔和精车外形。4 . The thin-walled shell processing process according to claim 1 , wherein the primary semi-finishing, the second semi-finishing and the finishing all comprise a finishing inner hole and a finishing shape. 5 . 5.根据权利要求4所述的薄壁壳体加工工艺，其特征在于：所述精车外形工序前，先对零件进行激光打标。5 . The thin-walled shell processing process according to claim 4 , wherein: before the finishing process of contouring, laser marking is performed on the parts. 6 . 6.根据权利要求1所述的薄壁壳体加工工艺，其特征在于：所述铣成型面的所述专用夹具包括卡包括卡盘，所述卡盘底面外沿间隔设置有垫块；所述卡盘的卡爪内面固定有定位块；所述定位块内面为与零件外壁贴合的弧面结构；至少一所述定位块上旋接有定位柱。6 . The thin-walled shell processing process according to claim 1 , wherein the special fixture for milling the forming surface comprises a chuck including a chuck, and spacers are provided at intervals on the outer edge of the bottom surface of the chuck; A positioning block is fixed on the inner surface of the jaws of the chuck; the inner surface of the positioning block is an arc surface structure that fits with the outer wall of the part; at least one of the positioning blocks is screwed with a positioning column.
CN202111480338.8A 2021-12-06 2021-12-06 A kind of thin-walled shell processing technology Pending CN114083243A (en)

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Publication number Priority date Publication date Assignee Title
CN114918627A (en) * 2022-06-17 2022-08-19 四川玖谊源粒子科技有限公司 Metal box body machining method based on turning and milling
CN114918627B (en) * 2022-06-17 2024-03-19 四川玖谊源粒子科技有限公司 Metal box body machining method based on turning and milling
CN115647732A (en) * 2022-09-30 2023-01-31 中国科学院光电技术研究所 Precision machining method for high-precision aluminum-based silicon carbide thin-wall shell type part
CN115647732B (en) * 2022-09-30 2024-04-19 中国科学院光电技术研究所 A precision machining method for high-precision aluminum-based silicon carbide thin-walled shell parts
CN115722868A (en) * 2022-11-02 2023-03-03 中国航发沈阳黎明航空发动机有限责任公司 Machining method for ensuring coaxiality of stator casing assembling holes
CN115555814A (en) * 2022-12-08 2023-01-03 西安聚能超导磁体科技有限公司 Superconducting magnet framework processing method and superconducting magnet framework
CN118635818A (en) * 2024-06-19 2024-09-13 中国第一汽车股份有限公司 A method for processing a slender thin-walled sleeve, a thin-walled sleeve and an open sleeve

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