CN111318855A - Method for machining cylindrical part - Google Patents
Method for machining cylindrical part Download PDFInfo
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- CN111318855A CN111318855A CN201911079917.4A CN201911079917A CN111318855A CN 111318855 A CN111318855 A CN 111318855A CN 201911079917 A CN201911079917 A CN 201911079917A CN 111318855 A CN111318855 A CN 111318855A
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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
Abstract
The invention discloses a processing method of a cylindrical part, which comprises the following steps: performing rough machining on the part; carrying out primary stabilization treatment on the part; performing semi-finishing on the part; carrying out secondary stabilizing treatment on the part; performing finish machining on the part; and (5) oil immersion protection is performed on the parts after finish machining. The processing method provided by the invention can obtain products with higher size and form and position precision, and has the advantages of good size stability and high product qualification rate.
Description
Technical Field
The invention belongs to the field of machining and manufacturing of parts, and particularly relates to a method for machining a cylindrical part.
Background
In the field of space satellite equipment, the requirement of light weight is met, parts are usually made of light weight materials and often have hollow and thin-walled structural characteristics.
For example, the satellite mount member is a thin-walled cylindrical member made of a magnesium alloy of ZK 61M-T5. The magnesium alloy has the advantages of small density, high specific strength, good shock absorption and stronger impact load bearing capacity than aluminum alloy, and is an ideal manufacturing raw material for aerospace lightweight equipment. The ZK61M alloy in the magnesium alloy system is a wrought Mg-Zn-Zr magnesium alloy with the highest strength and specific strength in all magnesium alloy systems, and has been widely used in the field of satellite equipment manufacturing in recent years.
However, the cylindrical parts with hollow-out and thin-wall structure will cause the rigidity of the whole parts to be weak, and each single part is required to have high dimensional and form and position precision due to the requirement of ensuring assembly precision. However, due to the influence of the internal stress existing in the material and the stress generated in the machining process, the dimensional stability of the part fluctuates to some extent along with the gradual release of the internal stress during and after the machining process, so that the final dimension and form and position accuracy of the product are affected.
Disclosure of Invention
In view of the above, the present invention is directed to a method for machining a cylindrical part, so as to solve the problem in the prior art that dimensional stability fluctuates along with gradual release of internal stress during and after machining of the part.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a processing method of a cylindrical part, which comprises the following steps:
performing rough machining on the part;
carrying out primary stabilization treatment on the part;
performing semi-finishing on the part;
carrying out secondary stabilizing treatment on the part;
performing finish machining on the part;
and (5) oil immersion protection is performed on the parts after finish machining.
Preferably, the rough machining specifically comprises:
firstly, carrying out rough turning processing on the part, and then carrying out rough milling processing on the part.
Preferably, the roughing comprises:
roughly turning the outer molded surface, the inner molded surface and/or the end surfaces of two ends of the part;
rough milling open grooves, recesses and/or bosses on the surface of the part.
Preferably, the first stabilization treatment and/or the second stabilization treatment each comprise:
heating the part;
preserving the heat of the heated part for a preset time;
cooling to room temperature along with the furnace;
cooling the part cooled to room temperature;
and preserving the heat of the cooled part for a preset time.
Preferably, the first stabilizing treatment and/or the second stabilizing treatment each specifically include:
heating the part to 110-130 ℃;
preserving the heat for 3-5 hours;
cooling to room temperature along with the furnace;
cooling the part to-60 to-75 ℃;
and preserving the heat for 15-17 hours.
Preferably, the semi-finishing is specifically:
firstly, carrying out semi-finish turning on the part, and then carrying out semi-finish milling on the part.
Preferably, the semi-finishing comprises:
semi-finish turning the outer profile, the inner profile and/or the end surfaces at two ends of the part;
and semi-finish milling open grooves, depressions and/or bosses on the surface of the part.
Preferably, the finishing specifically comprises:
firstly, carrying out finish milling processing on the part, and then carrying out finish turning processing on the part.
Preferably, the oil immersion protection for the finished part specifically comprises:
after the parts are subjected to finish milling and before finish turning, the parts are protected by oil immersion;
and after the parts are subjected to finish turning, the parts are protected by oil immersion.
Preferably, after the second stabilizing treatment is performed on the part and before the part is subjected to the finish machining, the machining method further includes: and carrying out secondary semi-finish turning on the part.
The thin-wall cylindrical part processed by the processing method of the cylindrical part provided by the invention has good dimensional stability, and can obtain products with higher dimensional and form and position precision, thereby solving the technical current situation that the product percent of pass is lower due to the deformation of the conventional processing method of the parts.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a process flow diagram of a method of machining a cylindrical part according to the present invention;
FIG. 2 is a schematic view of a rough turning structure of a part;
FIG. 3 is a schematic diagram of a rough milling structure of a part;
FIG. 4 is a schematic diagram of a semi-finish turning structure of a part;
FIG. 5 is a schematic diagram of a semi-finish milling structure of a part;
FIG. 6 is a schematic view of a second semi-finish turning structure of a part;
fig. 7 is a schematic view of the final structure of the part.
Description of reference numerals:
1-a solid of revolution; 2-a large-end flange; 3-a small end flange; 4-reinforcing ribs; 5-a window; 6-boss.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may also be otherwise oriented, such as by rotation through 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
The invention provides a processing method of a cylindrical part, which comprises the following steps:
1) rough machining is carried out on the part:
the rough machining specifically comprises the following steps: firstly, carrying out rough turning processing on the part, and then carrying out rough milling processing on the part.
In one embodiment, the outer profile, the inner profile and/or the end faces of both ends of the part are rough turned; and roughly milling open grooves, depressions and/or bosses on the surface of the part. The single-side allowance of the rough machined part is controlled to be 4 +/-0.2 mm.
It will be appreciated that one or more of the outer profile, inner profile and end faces at both ends of the rough-turned part may be selected, as well as one or more of the open slots, recesses and bosses of the rough-milled part, depending on the part requirements. In addition, the rough machining may also include only rough turning, or only rough milling.
2) Carrying out primary stabilizing treatment on the part:
after the rough machining of the part, carrying out primary stabilization treatment, wherein the primary stabilization treatment specifically comprises the following steps:
heating the part;
preserving the heat of the heated part for a preset time;
cooling to room temperature along with the furnace;
cooling the part cooled to room temperature;
and preserving the heat of the cooled part for a preset time.
In one embodiment, the first stabilization treatment comprises the following specific steps:
heating the part to 110-130 ℃, preserving heat for 3-5 hours, and then cooling the part to room temperature along with the furnace;
then, cooling the part to-60 to-75 ℃, and preserving heat for 15 to 17 hours, wherein the cooling and heat preserving process can be specifically implemented as follows: and (3) putting the part into a special heat preservation box, coating the part with dry ice, cooling to a preset temperature, and then preserving the heat, wherein the part can be cooled in other modes except a dry ice coating cooling mode, such as being put into a space with the preset temperature.
It will be understood by those skilled in the art that the manner of the stabilization treatment is not limited to that described in the above embodiments, for example, the stabilization treatment may include only a step of heating the part and then holding it for a predetermined time, and not a step of cooling it; or the part is left for a long time to be stabilized. The above described mode of stabilization treatment is a preferred embodiment of the present invention.
3) Semi-finishing the part:
after the first stabilization treatment, performing semi-finishing on the part, wherein the semi-finishing specifically comprises the following steps: firstly, carrying out semi-finish turning on the part, and then carrying out semi-finish milling on the part.
In one embodiment, the outer profile, the inner profile and/or the end faces at both ends of the part are semi-finish machined; and then semi-finish milling open grooves, depressions and/or bosses on the surface of the part. And controlling the single-side allowance of the semi-finished part to be 1 +/-0.2 mm.
It will be appreciated that, similar to roughing, one or more of the outer profile, inner profile and end faces at both ends of the semi-finished part may be selected, as well as one or more of the open slots, recesses and bosses of the semi-finished part, depending on the part requirements. In addition, the semi-finishing may also include only semi-finishing, or only semi-finishing milling.
4) And (3) carrying out secondary stabilizing treatment on the part:
after the semi-finishing of the part, a second stabilization treatment is performed.
In one embodiment, the steps of the second stabilization treatment are the same as the steps of the first stabilization treatment, and each of the steps comprises: heating the part, and keeping the heated part at the temperature for a preset time; and then cooling the parts to room temperature along with the furnace, cooling the parts cooled to room temperature, and preserving the heat of the cooled parts for preset time.
Of course, it is understood that in other embodiments, the step of the second stabilization process may be set differently from the step of the first stabilization process.
5) And (3) carrying out secondary semi-finish turning on the part:
in one embodiment, preferably, the method further comprises the step of performing a second semi-finish machining of the part, after the second stabilizing treatment of the part and before the finishing. Before the second semi-finish turning, the actual machining allowance at each position is detected, the outer molded surface, the inner molded surface and the end surfaces at two sides of the turned part are machined, and the single-side allowance is controlled to be 0.5 +/-0.1 mm after the machining.
Of course, the technical scheme provided by the invention also comprises the step of directly carrying out finish machining treatment after carrying out secondary stabilization treatment on the part.
6) And (3) carrying out finish machining on the part:
the fine processing specifically comprises the following steps: firstly, carrying out finish milling processing on the part, and then carrying out finish turning processing on the part.
In one embodiment, the through slots, exterior depressions, ribs, bosses and/or holes of the part are milled into place. The wall thickness of the cylinder body is controlled to be 3.5 +/-0.1 mm (the balance is 0.5 mm).
And then, carrying out finish turning according to a part drawing, wherein the outer molded surface is firstly subjected to finish turning, and then the inner molded surface is subjected to finish turning, so that the wall thickness of the cylinder is ensured to be 3.0 +/-0.1 mm.
7) Oil immersion protection of the finished parts:
the oil immersion protection for the finished parts specifically comprises the following steps:
after the parts are subjected to finish milling and before finish turning, the parts are protected by oil immersion, and the whole parts can be put into kerosene to prevent the surface of the parts from being oxidized;
and the number of the first and second groups,
after the parts are subjected to finish turning, the parts are subjected to oil immersion protection, specifically, the parts are integrally placed into kerosene for subsequent processes.
The thin-wall cylindrical part is processed by the processing method of the cylindrical part, so that a product with high size and shape and position precision can be obtained, and the dimensional stability is good. The technical situation that the product percent of pass is low due to deformation of the conventional processing method of the parts can be solved. The processing method provided by the invention is particularly suitable for machining thin-wall cylindrical parts made of magnesium alloy materials, and can be applied to processing of aluminum alloy, titanium alloy and stainless steel parts with similar structural characteristics.
The following describes in detail specific steps of machining a part by using the machining method provided by the present invention, with reference to the accompanying drawings.
The structure of a certain satellite equipment part is shown in figures 2 and 3, the main body of the part is a conical cylinder-shaped revolving body structure with a large-end flange 2 and a small-end flange 3 at two ends respectively, the wall thickness of the revolving body 1 in the middle is 3mm, and twelve reinforcing ribs 4 with the width of 5mm are uniformly distributed on the outer surface of the revolving body 1. The revolving body 1 is provided with a runway-shaped window 5 with the length of 162mm, the width of 60mm and four corners of R25. In addition, a boss 6 is arranged on the revolving body 1;
rough turning is carried out on the blank according to the structure shown in the figure 2, ① small ends are clamped, large end planes are turned with reference to an outer circle, ② large end flanges 2 are turned, ③ small end flanges 3 are turned, ④ outer conical surfaces are turned, ⑤ large end inner holes are turned, ⑥ inner conical surfaces are turned, ⑦ turning clamping is carried out, small end faces are turned, and ⑧ small end inner holes are turned;
carrying out rough milling processing according to the figure 3, wherein ① mills a window 5 and leaves 5mm of single-side allowance, ② mills sinking between the reinforcing ribs 4 on the outer molded surface, the wall thickness of the revolving body 1 and the reinforcing ribs 4 has 5mm of single-side allowance, ③ mills a boss 6 and has 5mm of single-side allowance;
the first stabilization treatment comprises the steps of heating ① the parts to 120 ℃, preserving heat for 4 hours, cooling in a furnace to room temperature, burying ② the parts with dry ice, cooling to-70 ℃, preserving heat for 16 hours, and taking out.
According to the semi-finish turning shown in the figure 4, ① clamps a large end face of a small end car, a single side margin is reserved for 1mm, ② cycles an outer circle of a large end flange 2, ③ cycles an outer circle of a small end flange 3, ④ outer conical surfaces of the car, a single side margin is reserved for 1mm, ⑤ cycles a large end inner hole, a single side margin is reserved for 1mm, ⑥ inner conical surfaces of the car, a single side margin is reserved for 1mm, ⑦ turns the head to clamp the small end face of the car, a single side margin is reserved for 1mm, and ⑧ cycles a small end inner hole, a single side margin is reserved.
According to the figure 5, semi-finish milling is carried out, wherein ① mills a window 5, a single side of the margin is left for 1mm, ② mills sinking among the reinforcing ribs 4, the single side of the revolving body 1 and the reinforcing ribs 4 is guaranteed to be left for 1mm, ③ mills a boss 6, and a single side of the margin is left for 1 mm;
a second stabilization treatment, wherein ① heats the parts to 120 ℃, keeps the temperature for 4 hours, cools the furnace to room temperature, buries the parts with dry ice ②, cools the parts to-70 ℃, keeps the temperature for 16 hours, and then takes out the parts;
according to the figure 6, secondary semi-finish turning is carried out, wherein ① clamps the large end face of the small end car, and a single-side allowance is reserved for 0.5mm, ② the outer circle of the large end flange 2 is reserved for 3.5mm ③ the outer circle of the small end flange 3 is reserved for 1.5mm, ④ the outer conical surface of the car is reserved for 0.5mm of a single-side allowance, ⑤ the inner hole of the large end car is reserved for 0.5mm of a single-side allowance, ⑥ the inner conical surface of the car is reserved for 0.5mm of a single-side allowance, ⑦ turns around the small end face of the clamping car, and a single-side allowance is reserved for 0.5mm, ⑧ the inner hole of the small end car is;
carrying out finish milling according to the final structure diagram of the part shown in the figure 7, wherein ① finish milling a window 5, finish milling sinkings among reinforcing ribs 4 to ensure that the wall thickness is 3.5mm and the rib width is 5mm, ③ finish milling a boss 6, ④ drilling holes, and ⑤ immersing kerosene;
according to the final structure diagram of the part shown in the figure 7, the fine turning machining is carried out, wherein ① clamps a small-end inner cavity and turns a large end face, the outer circle of a large-end flange 2 is finely turned, the outer circle of a small-end flange 3 is ③ finely turned, the outer conical surface is ④ finely turned, the inner conical surface is ⑤ finely turned, the end of ⑥ is turned and clamped, the rest part of the small end of the inner conical surface is turned, and ⑦ is immersed in kerosene;
it should be understood by those of ordinary skill in the art that the specific constructions and processes illustrated in the foregoing detailed description are exemplary only, and are not limiting. Furthermore, the various features shown above can be combined in various possible ways to form new solutions, or other modifications, by a person skilled in the art, all falling within the scope of the present invention.
Claims (10)
1. A method of machining a cylindrical part, the method comprising:
performing rough machining on the part;
carrying out primary stabilization treatment on the part;
performing semi-finishing on the part;
carrying out secondary stabilizing treatment on the part;
performing finish machining on the part;
and (5) oil immersion protection is performed on the parts after finish machining.
2. The method for machining a cylindrical part according to claim 1, wherein the rough machining is specifically:
firstly, carrying out rough turning processing on the part, and then carrying out rough milling processing on the part.
3. The method of machining a cylindrical part according to claim 1, wherein the rough machining includes:
roughly turning the outer molded surface, the inner molded surface and/or the end surfaces of two ends of the part;
rough milling open grooves, recesses and/or bosses on the surface of the part.
4. The method of machining a cylindrical part according to claim 1, characterized in that the first stabilization treatment and/or the second stabilization treatment each comprise:
heating the part;
preserving the heat of the heated part for a preset time;
cooling to room temperature along with the furnace;
cooling the part cooled to room temperature;
and preserving the heat of the cooled part for a preset time.
5. A method for machining a cylindrical part according to claim 3, characterized in that the first stabilization treatment and/or the second stabilization treatment each comprise in particular:
heating the part to 110-130 ℃;
preserving the heat for 3-5 hours;
cooling to room temperature along with the furnace;
cooling the part to-60 to-75 ℃;
and preserving the heat for 15-17 hours.
6. The method for machining a cylindrical part according to claim 1, wherein the semi-finishing is specifically:
firstly, carrying out semi-finish turning on the part, and then carrying out semi-finish milling on the part.
7. The method of machining a cylindrical part according to claim 1, wherein the semi-finishing includes:
semi-finish turning the outer profile, the inner profile and/or the end surfaces at two ends of the part;
and semi-finish milling open grooves, depressions and/or bosses on the surface of the part.
8. The method for machining a cylindrical part according to claim 1, wherein the finishing work is specifically:
firstly, carrying out finish milling processing on the part, and then carrying out finish turning processing on the part.
9. The method for machining a cylindrical part according to claim 8, wherein the oil immersion protection of the finished cylindrical part specifically comprises:
after the parts are subjected to finish milling and before finish turning, the parts are protected by oil immersion;
and after the parts are subjected to finish turning, the parts are protected by oil immersion.
10. The method of machining a cylindrical part as recited in any one of claims 1 to 9, further comprising, after the second stabilizing treatment is performed on the part and before the finish machining is performed on the part: and carrying out secondary semi-finish turning on the part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911079917.4A CN111318855A (en) | 2019-11-07 | 2019-11-07 | Method for machining cylindrical part |
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| CN201911079917.4A CN111318855A (en) | 2019-11-07 | 2019-11-07 | Method for machining cylindrical part |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112276494A (en) * | 2020-10-28 | 2021-01-29 | 上海航天精密机械研究所 | Method for integrally processing and manufacturing weak-rigidity thin-wall ring frame suitable for spacecraft |
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