CN118287962A - A method for precision machining of thin-walled beryllium aluminum alloy bracket parts - Google Patents
A method for precision machining of thin-walled beryllium aluminum alloy bracket parts Download PDFInfo
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- CN118287962A CN118287962A CN202410408422.6A CN202410408422A CN118287962A CN 118287962 A CN118287962 A CN 118287962A CN 202410408422 A CN202410408422 A CN 202410408422A CN 118287962 A CN118287962 A CN 118287962A
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- aluminum alloy
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- beryllium aluminum
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H5/00—Combined machining
- B23H5/04—Electrical discharge machining combined with mechanical working
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Abstract
The embodiment of the invention provides a precision machining method for a thin-wall beryllium aluminum alloy support part, which comprises the following steps: step 1: turning an excircle of a beryllium aluminum alloy part blank with the allowance of 0.1-0.15 mm, and establishing a coarse standard; step 2: mounting a rough datum locating clamp on a workbench, and milling a top surface groove to a size; step 3: milling the lateral curved surface and the reinforcing ribs to the size. In the step 1, only the outer circle of the beryllium aluminum alloy part blank is machined, and an inner hole is not machined, so that the inner side supporting strength of the part is high, and the machined surface of the part blank is free of chatter marks. In the step 3, only the lateral curved surface and the reinforcing ribs of the part blank are processed, and the fan-shaped inner cavity is not processed, so that the surface quality of the thin-wall beryllium aluminum alloy bracket part manufactured by the processing method is good, and the finished product rate of the part is greatly improved.
Description
Technical Field
The invention relates to the technical field of part machining methods, in particular to a precision machining method for a thin-wall beryllium-aluminum alloy bracket part.
Background
The beryllium aluminum alloy has the advantages of light weight, high specific strength, high specific rigidity, good thermal stability, high toughness, corrosion resistance and the like. It combines the low density of beryllium with the easy workability of aluminum and other excellent characteristics, and has become an increasingly important new material. Along with the continuous development and increasing demands of industries in China, the structures and the types of parts gradually show various, complex, thin-wall and light-weight states, and higher requirements are put forward on the mechanical processing of cast beryllium aluminum alloy mechanism parts.
The precise casting process is an important preparation method of the beryllium aluminum alloy, the production cost of the beryllium aluminum alloy can be greatly reduced, and the subsequent precise machining is a key point that the product can finally meet the use requirement. Referring to fig. 1, the thin-wall beryllium aluminum alloy support part is a rotationally symmetrical complex thin-wall cast aluminum alloy part, and comprises a plurality of thin-wall curved surfaces, a plurality of weight-reducing grooves, a plurality of reinforcing ribs and the like. Wherein, the thickness of the thin-wall curved surface is less than or equal to 1mm, the thickness of the reinforcing rib is 2-4mm, and the thickness of the lightening hole groove is less than or equal to 1 mm. The method also belongs to the starting stage in the technical field of precision machining of rotating complex thin-wall parts, and particularly belongs to the fumbling stage in the technical field of precision machining of casting beryllium aluminum alloy parts such as rotational symmetry, complex thin-wall, high-precision molded surfaces and the like.
The prior art has a method for processing the thin-wall beryllium aluminum alloy bracket part, which comprises the steps of obtaining a part blank, positioning and clamping a coarse datum to a workbench, milling a weight reduction groove, processing a pin hole on the bottom surface, and the like, and comprises the following technological processes:
1) Turning an outer circle and an inner hole of a part blank, wherein the allowance is 0.1-0.3mm, and establishing a coarse reference;
2) Milling the top surface groove to the size;
3) Milling the triangular sector inner cavity to a size, wherein the extension length L of the cutter is more than or equal to 65mm, the machining vibration is large, and the vibration lines are obvious;
4) Milling lateral curved surfaces and ribs to the size, wherein a machining tool path is formed by machining from outside to inside;
5) Milling the reverse side groove to the size;
6) Aging treatment;
7) Finish turning the outer circle and the inner hole to the size;
8) Grinding a reference surface;
9) Finish milling the end face.
Milling a weight-reducing groove in a machining center, milling an external weight-reducing groove, milling a lateral thin-wall curved surface, turning an inner hole, and wire cutting to machine a fan-shaped thin-wall curved surface, wherein the existing precision machining method leads to poor qualification rate of finished products of parts.
Disclosure of Invention
In order to solve the technical problems, the invention provides a precision machining method for thin-wall beryllium-aluminum alloy support parts, and the precision machining method is used for improving the qualification rate of finished products.
A precision machining method for a thin-wall beryllium aluminum alloy bracket part comprises the following steps:
step 1: turning an excircle of a beryllium aluminum alloy part blank, reserving a margin of 0.1-0.15 mm, and establishing a coarse reference;
step 2: the rough datum positioning clamp of the part is mounted on a workbench, and a top surface groove is milled until the part is marked with a size;
step 3: milling the lateral curved surface of the part and the reinforcing ribs to the marked size of the part;
step 4: milling a bottom surface groove part of the part to be marked to a size;
Step 5: and (5) aging the part.
After the step 4 and before the step 5, the method further comprises the following steps: step 50: and (5) adopting wire cutting electric spark to process the triangular sector inner cavity until the part is marked with the size.
The step 50 includes: clamping the part by adopting a linear cutting clamp; the wire cutting clamp comprises a clamp body, wherein the top surface of the clamp body is provided with a step which is recessed inwards towards the bottom surface, the step is an inner slot limiting part, and the inner slot limiting part is provided with a positioning and orientation pin hole along the axial direction; the inner slot limit part is matched with the coarse datum; and fixedly connecting the part with the linear cutting clamp through a locating pin.
The step 5 further comprises the following steps:
step 6: finish turning is carried out on the part subjected to aging treatment to finish turning the outer circle and the inner hole until the part is marked with dimensions;
step 7: grinding the coarse fiducials;
step 8: finish milling the top and bottom surfaces of the part.
The side of anchor clamps body is equipped with the orientation and finds the front, when installing wire-electrode cutting anchor clamps to workstation, the orientation is aimed at the front and is used for confirming X direction positive.
The positioning and orientation pin holes are uniformly distributed on the circumference, and the plane where the central lines of the two positioning and orientation pin holes are located is perpendicular to the plane where the orientation and alignment surface is located.
And a pressing plate is arranged on the upper top surface of the clamp body, and the coarse datum is pressed by the pressing plate when the part is assembled with the linear cutting clamp.
The pressing plate is provided with a fastening screw, and the pressing plate is connected with the thick standard through the fastening screw and is pressed tightly; the pressing plate comprises two pressing plates which are oppositely arranged.
The step 8 includes: clamping the part by adopting a finish machining tool, and finish-milling the top surface and the bottom surface of the part;
the finishing tool comprises: a positioning plane and a compacting plate;
the plane precision of the positioning plane is more than 0 and less than or equal to 0.003 mm, and the surface roughness is less than or equal to Ra0.4;
The compressing plate is a hollow circular plate, and the shape of the hollow part is matched with the external shape of the part;
the pressing plate and the positioning plane are provided with through holes for connecting the part with the positioning plane and the pressing plate by penetrating bolts;
When the top surface of the part is milled, the bottom surface of the part is attached to the positioning plane of the finish machining tool, the hollow part of the pressing plate is clamped to the outer wall of the part, and the part is fixedly connected with the positioning plane and the pressing plate through bolts.
According to the precision machining method for the thin-wall beryllium-aluminum alloy support part, only the outer circle of the beryllium-aluminum alloy part blank and the unprocessed inner hole are machined in the step 1, so that the inner side supporting strength of the part is high, and the machined surface of the part blank is free of chatter marks. In the step 3, only the lateral curved surface and the reinforcing ribs of the part blank are processed, and the fan-shaped inner cavity is not processed, so that the surface quality of the thin-wall beryllium aluminum alloy bracket part manufactured by the processing method is good, and the finished product rate of the part is greatly improved.
Drawings
FIG. 1 is a schematic illustration of a thin-walled beryllium aluminum alloy stent component of the prior art;
fig. 2 is a schematic diagram of a pin hole rough reference of a thin-wall beryllium aluminum alloy support part provided by an embodiment of the present invention;
fig. 3 is a schematic view of a wire cutting fixture according to an embodiment of the present invention;
FIG. 4 is a schematic view of an assembly of a part and a wire cutting jig according to an embodiment of the present invention;
FIG. 5 is a schematic view of a positioning plane according to an embodiment of the present invention;
Fig. 6 is a schematic structural view of a compacting plate according to an embodiment of the present invention;
fig. 7 is a schematic view of an assembly of a positioning plane, a part and a compacting plate according to an embodiment of the invention.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
The embodiment of the invention provides a precision machining method for a thin-wall beryllium aluminum alloy support part, which comprises the following steps:
step 1: turning an excircle of a beryllium aluminum alloy part blank, reserving a margin of 0.1-0.15 mm, and establishing a coarse reference;
Step 2: mounting the rough datum locating clamp on a workbench, and milling a top surface groove until the part is marked with a size;
Step 3: milling the lateral curved surface and the reinforcing ribs to the marked size of the part;
step4: milling the bottom surface groove to the labeling size of the part;
Step 5: and (5) aging the parts. Then, the following processing steps are carried out according to the prior art:
step 6: finish turning the outer circle and the inner hole of the part subjected to aging treatment to reach the size;
step 7: grinding the coarse fiducials;
Step 8: finish milling the end face of the part.
In the processing method provided by the embodiment of the invention, in the step 1, only the outer circle and the unprocessed inner hole of the beryllium aluminum alloy part blank are machined, so that the inner side supporting strength of the part is high, and the machined surface of the part blank has no chatter marks. In the step 3, only the lateral curved surface and the reinforcing ribs of the part blank are processed, and the fan-shaped inner cavity is not processed, so that the surface quality of the thin-wall beryllium aluminum alloy bracket part manufactured by the processing method is good, and the finished product rate of the part is greatly improved. Further, when the lateral thin-wall curved surface is processed, in order to avoid the curved surface processing cracking, according to the cavity structure of the outer curved surface, a lateral thin-wall curved surface feeding path is designed to be from top to bottom (guaranteeing bottom support), milling (guaranteeing downward cutting force), vertical milling (reducing cutting resistance of the cutter) and finally outer corner cleaning (enough support can be provided for the reinforcing rib 2 and the upper end face and the lower end face).
In the above embodiment, after the step 4 and before the step 5, the method further includes a step 50: and adopting wire cutting electric spark to process the triangular sector inner cavity to the size.
A plurality of reinforcing ribs are arranged in the thin-wall beryllium aluminum alloy bracket part in the prior art, and a cavity formed between two adjacent reinforcing ribs is a triangular sector-shaped inner cavity. The tool is used for clamping the blank of the thin-wall beryllium aluminum alloy bracket part, and the triangular sector inner cavity is machined by wire cutting and electric spark, so that the precision of a finished product of the part is ensured to a certain extent, the machining process is free of cutting force, the cutting stress is small, and the high machining quality is ensured.
Referring to fig. 2, in the above embodiment, the step 50 includes: clamping the part by adopting a linear cutting clamp; the wire cutting clamp comprises a clamp body, wherein the top surface of the clamp body is provided with a step which is recessed inwards towards the bottom surface, the step is an inner slot limiting part, and the inner slot limiting part is provided with a positioning and orientation pin hole along the axial direction; the inner groove hole limiting part is matched with the rough reference of the part, a pin hole can be formed in the rough reference, the positioning and orientation pin hole corresponds to the pin hole in the rough reference, and the part is fixedly connected with the linear cutting clamp through a positioning pin.
When the part is clamped on the linear cutting clamp, the rough reference of the part is matched with the step of the linear cutting clamp, namely the limiting part of the inner slot, and the reference surface is connected with the linear cutting clamp through the locating pin, so that the linear cutting clamp is fixedly connected with the part.
Referring to fig. 3, in the above embodiment, the side surface of the jig body is provided with an orientation finding surface for determining an X-direction surface when the wire cutting jig is mounted to a table.
After the part is clamped to the linear cutting clamp, when the linear cutting clamp is mounted to the workbench, in order to improve machining precision, alignment of an X-direction forward surface is required, and an orientation alignment face is arranged on the side face of the clamp body, so that alignment of the X-direction forward surface is facilitated, machining precision of the part is improved, and yield of finished products is improved.
Referring to fig. 3, in the above embodiment, the positioning and orientation pin holes include two positioning and orientation pin holes uniformly distributed on the circumference, and a plane where a center line of the two positioning and orientation pin holes is located is perpendicular to a plane where the orientation alignment surface is located.
In order to accurately position the parts, the displacement generated in the machining process is avoided while the positioning accuracy is enhanced, the planes of the central lines of the two positioning and orientation pin holes are perpendicular to the planes of the orientation alignment surfaces, the accurate positioning of the parts is ensured, and meanwhile, the displacement of the linear cutting clamp can be avoided to a certain extent, so that the accurate machining accuracy is ensured, and the qualification rate of finished products is improved.
Referring to fig. 3 and 4, in the above embodiment, a pressing plate is provided on the upper top surface of the jig body, by which the coarse fiducial is pressed when the part is assembled with the wire cutting jig.
The part is assembled with the linear cutting clamp through the pressing plate, the part is further fixed with the linear cutting clamp, accurate positioning of the part is guaranteed to a greater extent, and displacement is avoided. The pressing plate can be fixedly arranged on the top surface of the clamp body, and then the coarse datum is clamped into the pressing plate, or other clamping devices are used for clamping and fixing the pressing plate and the coarse datum.
In the above embodiment, the pressing plate is provided with a fastening screw, and the pressing plate is connected with and pressed against the coarse datum through the fastening screw.
After the pressing plate is fixed with the rough reference position, the pressing plate is positioned and pressed with the rough reference through the fastening screw, and the connection is reliable and convenient to detach.
In the above embodiment, the number of the pressing plates is two, which are oppositely arranged, so that the fastening reliability is further improved, and of course, the number of the pressing plates can be multiple, and the pressing plates can be freely selected according to practical situations.
Referring to fig. 5, 6 and 7, in the above embodiment, the step 8 includes: clamping the part by adopting a finish machining tool, and finish-milling the top surface and the bottom surface of the part; the finishing tool comprises: a positioning plane and a compacting plate; the plane precision of the positioning plane is more than 0 and less than or equal to 0.003 mm, and the surface roughness is less than or equal to Ra0.4; the compressing plate is a hollow circular plate, and the shape of the hollow part is matched with the external shape of the part; the compressing plate and the positioning plane are provided with through holes for penetrating bolts to connect the parts with the positioning plane and the compressing plate.
The step 8 includes: when milling the top surface of the part, will the part bottom surface with the locating plane laminating location of finish machining frock, will the cavity card of pressure strip advance to the outer wall of part, will through the bolt the part with locating plane with the pressure strip is connected fixedly, mills the processing of processing completion top plane, and when the planarization is less than the bottom top surface, will the part top surface with the locating plane laminating location of finish machining frock, will the cavity card of pressure strip advance to the outer wall of part, will through the bolt the part with locating plane with the pressure strip is connected fixedly, mills the processing of processing completion bottom plane, and the planarization is less than or equal to 0.01 millimeter.
It will be evident to those skilled in the art that the embodiments of the invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units, modules or means recited in a system, means or terminal claim may also be implemented by means of software or hardware by means of one and the same unit, module or means.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the embodiment of the present invention, and not for limiting, and although the embodiment of the present invention has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalent substitutions can be made to the technical solution of the embodiment of the present invention without departing from the spirit and scope of the technical solution of the embodiment of the present invention.
Claims (9)
1. The precise machining method for the thin-wall beryllium aluminum alloy bracket part is characterized by comprising the following steps of:
step 1: turning an excircle of a beryllium aluminum alloy part blank, reserving a margin of 0.1-0.15 mm, and establishing a coarse reference;
step 2: the rough datum positioning clamp of the part is mounted on a workbench, and a top surface groove is milled until the part is marked with a size;
step 3: milling the lateral curved surface of the part and the reinforcing ribs to the marked size of the part;
step 4: milling a bottom surface groove part of the part to be marked to a size;
Step 5: and (5) aging the part.
2. The method for precisely machining a thin-wall beryllium aluminum alloy support part according to claim 1, further comprising, after step 4 and before step 5: step 50: and (5) adopting wire cutting electric spark to process the triangular sector inner cavity until the part is marked with the size.
3. A method of precision machining a thin-walled beryllium aluminum alloy support member as described in claim 2 wherein said step 50 comprises: clamping the part by adopting a linear cutting clamp; the wire cutting clamp comprises a clamp body, wherein the top surface of the clamp body is provided with a step which is recessed inwards towards the bottom surface, the step is an inner slot limiting part, and the inner slot limiting part is provided with a positioning and orientation pin hole along the axial direction; the inner slot limit part is matched with the coarse datum; and fixedly connecting the part with the linear cutting clamp through a locating pin.
4. A method for precisely machining a thin-wall beryllium aluminum alloy support member as set forth in claim 3, wherein said step 5 further comprises:
step 6: finish turning is carried out on the part subjected to aging treatment to finish turning the outer circle and the inner hole until the part is marked with dimensions;
step 7: grinding the coarse fiducials;
step 8: finish milling the top and bottom surfaces of the part.
5. A method of precision machining a thin-walled beryllium aluminum alloy support member as described in claim 3 wherein the side of the fixture body is provided with a directional alignment surface for determining the X-direction positive surface when the wire cutting fixture is mounted to a table.
6. The method for precisely machining the thin-wall beryllium aluminum alloy support part according to claim 3, wherein the number of the positioning and orientation pin holes is two, the positioning and orientation pin holes are uniformly distributed on the circumference, and a plane where the central lines of the two positioning and orientation pin holes are located is perpendicular to a plane where the orientation alignment surface is located.
7. A method of precision machining a thin-walled beryllium aluminum alloy support member as described in claim 3 wherein a platen is provided on the upper top surface of the fixture body through which the coarse gauge is pressed when the member is assembled with the wire cutting fixture.
8. The method for precisely machining the thin-wall beryllium aluminum alloy support part according to claim 7, wherein a fastening screw is arranged on the pressing plate, and the pressing plate is connected with and pressed against the thick standard through the fastening screw; the pressing plate comprises two pressing plates which are oppositely arranged.
9. A method for precisely machining a thin-wall beryllium aluminum alloy support member as set forth in claim 4, wherein said step 8 includes: clamping the part by adopting a finish machining tool, and finish-milling the top surface and the bottom surface of the part;
the finishing tool comprises: a positioning plane and a compacting plate;
the plane precision of the positioning plane is more than 0 and less than or equal to 0.003 mm, and the surface roughness is less than or equal to Ra0.4;
The compressing plate is a hollow circular plate, and the shape of the hollow part is matched with the external shape of the part;
the pressing plate and the positioning plane are provided with through holes for connecting the part with the positioning plane and the pressing plate by penetrating bolts;
When the top surface of the part is milled, the bottom surface of the part is attached to the positioning plane of the finish machining tool, the hollow part of the pressing plate is clamped to the outer wall of the part, and the part is fixedly connected with the positioning plane and the pressing plate through bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410408422.6A CN118287962A (en) | 2024-04-07 | 2024-04-07 | A method for precision machining of thin-walled beryllium aluminum alloy bracket parts |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410408422.6A CN118287962A (en) | 2024-04-07 | 2024-04-07 | A method for precision machining of thin-walled beryllium aluminum alloy bracket parts |
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| CN118287962A true CN118287962A (en) | 2024-07-05 |
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| CN202410408422.6A Pending CN118287962A (en) | 2024-04-07 | 2024-04-07 | A method for precision machining of thin-walled beryllium aluminum alloy bracket parts |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119609571A (en) * | 2024-12-11 | 2025-03-14 | 四川精控阀门制造有限公司 | Processing method of arc surface valve seat of slurry plug valve |
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2024
- 2024-04-07 CN CN202410408422.6A patent/CN118287962A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119609571A (en) * | 2024-12-11 | 2025-03-14 | 四川精控阀门制造有限公司 | Processing method of arc surface valve seat of slurry plug valve |
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