CN111203707A - Titanium alloy sheet machining deformation control method - Google Patents
Titanium alloy sheet machining deformation control method Download PDFInfo
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- CN111203707A CN111203707A CN201811394797.2A CN201811394797A CN111203707A CN 111203707 A CN111203707 A CN 111203707A CN 201811394797 A CN201811394797 A CN 201811394797A CN 111203707 A CN111203707 A CN 111203707A
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- pressing plate
- titanium alloy
- pressing
- alloy sheet
- sheet part
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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
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
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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
- 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
Abstract
The invention discloses a method for controlling the processing deformation of a titanium alloy sheet part, which comprises the steps of firstly compacting a blank of the sheet part, checking and measuring a gap between the bottom surface of the part and a workbench, adding a cushion block at the gap according to a gap value, forming a pressure plate groove and drilling a countersink, wherein the depth of the pressure plate groove and the countersink is more than 0.2mm lower than a reference surface to be repaired, and then compacting the blank to flatten a first surface; and attaching the flattened first surface to a workbench, pressing the blank tightly, forming a pressure plate groove of the second surface, and pressing the blank tightly to flatten the second surface. The invention can effectively reduce the processing error of the titanium alloy sheet part, avoid the ultra-thin size of the titanium alloy sheet part, improve the processing efficiency of the sheet part, and simultaneously ensure the processing quality and the stability of the processing process of the titanium alloy sheet part.
Description
Technical Field
The invention belongs to the technical field of machine manufacturing, and particularly relates to a method for controlling machining deformation of a titanium alloy sheet part.
Background
Titanium alloy parts are increasingly used in aircraft construction because of their high strength, low density, good toughness and corrosion resistance, high heat resistance, and excellent mechanical properties. With the further improvement of the performance of the airplane, the weight requirement of the airplane on parts is higher and higher. The titanium alloy sheet part has good mechanical property and meets the light weight design requirement of the airplane.
Before the numerical control finish machining of the titanium alloy part, the numerical control face trimming is generally carried out, so that the part has better surface quality, and then the part is subjected to the numerical control finish machining of the inner appearance, so that the higher machining precision is achieved and the size is ensured to be in place.
The general processing scheme of the titanium alloy thin plate part is that numerical control trimming is carried out until the thickness of the thickest part is reached, then thermoforming is carried out, the flat plate part is changed into a part with a curved surface shape, and finally, the inner and outer shapes of all webs of the part with the curved surface shape are processed in place to be processed into a final finished product of the part. Because the part is a thin plate part, the uneven part easily causes the size of the part to be out of tolerance, the surface quality to be poor and the like in the numerical control face trimming process, thereby influencing the subsequent forming and finishing processes. Therefore, the method has a very positive effect of controlling the deformation condition of the thin plate type parts in the process of shaving.
In order to meet the requirements of surface finishing of titanium alloy sheet parts and ensure the processing quality of the parts and the stability of the processing process, the conventional method comprises the steps of firstly lapping a pressing plate to mill a pressing plate groove, then removing the lapped pressing plate and lapping the pressing plate at the newly milled pressing plate groove to finish the surface. However, this method has the following limitations:
(1) by overlapping the pressing plates on the periphery of the part, although the machining deformation of the periphery of the part can be controlled to a certain extent, some parts can cause poor surface quality and size of the machined part due to the fact that the pressing state is not in place;
(2) after the pressing plate is built, the pressing state of the middle area of the part cannot be guaranteed, the middle area of the part is easy to arch, and finally the middle area is ultra-small in size and poor in surface quality;
(3) when the first surface is machined, the first surface is not flattened due to the fact that the pressing state is not in place, the first surface which is not flattened is used as a reference surface to be attached to the workbench, and the situation that the size of the second surface is not in place after machining is easily caused.
Disclosure of Invention
The invention aims to provide a method for deformation control in a numerical control face-trimming milling process of a titanium alloy thin plate part, aiming at the defect of deformation control in the numerical control face-trimming milling process of the titanium alloy thin plate part at present.
The invention is mainly realized by the following technical scheme:
a method for controlling the processing deformation of a titanium alloy sheet comprises the following steps:
step S1: clamping a blank of a sheet part, lapping a pressing plate to press the blank, milling all pressing plate grooves, drilling pressing holes and reaming pits;
step S2: checking the gap between the bottom surface of the part and the workbench, and adding a cushion block according to the gap value;
step S3: lapping a pressing plate at the position of the pressing plate groove milled in the step S1, pressing a screw at the position of the dimple, and flattening the first surface;
step S4: and (5) taking the flattened first surface in the step (S3) as a reference surface to be attached to the workbench, milling a pressing plate groove by using a pressing plate, and flattening the second surface by using the pressing plate at the pressing plate groove.
The depth of the pressing plate groove and the countersink is lower than that of the datum plane to be repaired by more than 0.2mm, and the pressing plate is pressed at the correct position.
The drilling and the dimple are formed by drilling and the dimple in the excess material area of the part according to the shape of the part, and are compressed by a compression screw, so that the deformation condition of the middle area is effectively controlled.
The pressing plate of the previous step S1 is removed after the pressing plate pressing part is lapped at the pressing plate groove in the step S3.
The method is used for processing the titanium alloy sheet part with the blank thickness of less than or equal to 10mm, in the process of processing the sheet part, the lapping and pressing plate applies pretightening force, the deformation condition of the part is obtained by checking the gap between the part and a reference surface, the pressing plate groove is milled at the gap by adding the cushion block, the hole is drilled and reamed at the residual material position in the middle of the part, the lapping and pressing plate is replaced, the screw is pressed at the reamed position, and the first surface is flattened; and turning the lapping plate, milling a plate pressing groove, and replacing the lapping plate to repair the surface in place.
According to the invention, the cushion block is added at the gap, the gap between the part and the reference surface is checked after the pressing plate is overlapped, and the cushion block is added according to the size of the gap.
The invention effectively solves the problems that the deformation of the thin plate type part is difficult to control in the process of trimming, the thickness size of the part is easy to be ultrathin, the surface quality is poor and the like, avoids the scrapping of the thin plate part due to the size out of tolerance, and reduces the surface corrugation and the cutter connecting step of the part.
In the preparation process, a sheet part is compacted to mill all pressure plate grooves, and a compaction hole counter sinking is drilled at the position of the spare part, wherein the depths of the pressure plate grooves and the counter sinking are more than 0.2mm lower than the depth of a reference surface to be repaired, a cushion block is added at the gap between the bottom surface of the part and a workbench, and the front pressure plate is removed after the part is compacted to prevent the part from moving to cause inconsistent processing original points, so that a first surface is flattened; and the flattened first surface is taken as a reference surface to be attached to a workbench, a pressing plate is pressed to mill a pressing plate groove, wherein the pressing plate groove is lower than the reference surface to be flattened by more than 0.2mm, and the pressing plate is lapped at the pressing plate groove to flatten the second surface, so that the thickness and the size of the sheet part are effectively controlled.
Aiming at the blank of the titanium alloy sheet part, the problem that the titanium alloy sheet part is large in deformation and uncontrollable in the face trimming process is effectively solved, so that the thickness and the size of the titanium alloy sheet part are effectively controlled, and the size requirement is met; on the other hand, the positioning surface of the part is guaranteed to be in good contact with the working table surface through the additional cushion block, the pressing plate groove and the screw pressing, the vibration of the part in the face repairing process is reduced, the surface quality of the part is improved, the workload of a bench worker for polishing the surface of the part and the manual intervention in the machining process are reduced, the machining efficiency of the titanium alloy sheet part is improved, and the machining quality of the part and the stability of the machining process are guaranteed.
Drawings
FIG. 1 is a clamping schematic diagram before a pressure plate and a cushion block of a sheet part are pressed, a pressure plate groove is not formed, and a dimple is not drilled (FIG. 1a is a front view, and FIG. 1b is a top view);
FIG. 2 is a schematic view of pressing the plate and the compression screw at the opened plate slot (FIG. 2a is a front view, FIG. 2b is a top view);
FIG. 3 is a schematic view of the clamping before the second side is turned to form the pressure plate groove (FIG. 3a is a front view, and FIG. 3b is a top view);
FIG. 4 is a schematic view of a blank of a sheet metal part being pressed by a pressing plate at an opened pressing plate groove.
The method comprises the following steps of 1-cushion block, 2-workbench, 3-blank, 4-finished part, 5-pressing plate, 6-dimple, 7-screw and 8-pressing plate groove.
Detailed Description
The invention will be further described with reference to the drawings and examples, but the invention is not limited to these examples.
Example 1
The invention relates to a method for controlling the processing deformation of a titanium alloy sheet, which comprises the following steps:
step S1: clamping a blank 3 of a sheet part, pressing the blank 3 by a pressing plate 5, milling all pressing plate grooves 8, drilling pressing holes and manufacturing countersinks 6;
step S2: checking the gap between the bottom surface of the part and the workbench, and increasing a cushion block 1 according to the gap value;
step S3: lapping the pressing plate 5 at the pressing plate groove 8 milled in the step S1, pressing the screw 7 at the dimple, and flattening the first surface;
step S4: the first surface flattened in step S3 is bonded to the table 2 as a reference surface, the platen 5 mills the platen groove 8, and the platen 5 flattens the second surface at the platen groove 8.
The depth of the pressure plate groove 8 and the countersink 6 is lower than the reference surface to be repaired by more than 0.2mm, and the pressure plate is favorably pressed at the correct position
The drilling and the dimple are formed by drilling and the dimple in the excess material area of the part according to the shape of the part, and are compressed by a compression screw, so that the deformation condition of the middle area is effectively controlled.
In the step S3, after the pressing plate 5 is pressed against the component at the pressing plate groove 8, the pressing plate in the previous step S1 is removed.
Example 2
As shown in figure 1, during part processing, firstly, selecting one surface with better surface quality of a part as a positioning surface to be attached to a workbench, pressing a thin plate part by pressing plates around the part, and enabling the deformation condition of the part after pressing to be as shown in figure 1;
as shown in fig. 2, the pressing plate is removed, the pressing plate is lapped at the milled pressing plate groove, the screw is pressed at the dimple, and the first surface is flattened;
turning over, attaching the flattened first surface serving as a reference surface to a workbench, and lapping and milling a pressing plate groove by a pressing plate;
and finally, removing the pressing plate, lapping the pressing plate at the pressing plate groove, flattening the second surface and ensuring that the size is in place.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (3)
1. A method for controlling the processing deformation of a titanium alloy sheet is characterized by comprising the following steps:
step S1: clamping a blank of a sheet part, lapping a pressing plate to press the blank, milling all pressing plate grooves, drilling pressing holes and reaming pits;
step S2: checking the gap between the bottom surface of the part and the workbench, and adding a cushion block according to the gap value;
step S3: lapping a pressing plate at the position of the pressing plate groove milled in the step S1, pressing a screw at the position of the dimple, and flattening the first surface;
step S4: and (5) taking the flattened first surface in the step (S3) as a reference surface to be attached to the workbench, milling a pressing plate groove by using a pressing plate, and flattening the second surface by using the pressing plate at the pressing plate groove.
2. The method for controlling the processing deformation of the titanium alloy sheet part according to claim 1, wherein the depth of the pressing plate groove and the countersink is more than 0.2mm lower than the reference surface to be repaired, so that the pressing plate can be pressed at the correct position.
3. The method for controlling the processing deformation of the titanium alloy sheet part as claimed in claim 1, wherein the drilling and the countersinking are performed by drilling and the countersinking in the excess material region of the part according to the shape of the part, and the deformation of the middle region is effectively controlled by pressing with a compression screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811394797.2A CN111203707A (en) | 2018-11-22 | 2018-11-22 | Titanium alloy sheet machining deformation control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811394797.2A CN111203707A (en) | 2018-11-22 | 2018-11-22 | Titanium alloy sheet machining deformation control method |
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| CN111203707A true CN111203707A (en) | 2020-05-29 |
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| CN201811394797.2A Pending CN111203707A (en) | 2018-11-22 | 2018-11-22 | Titanium alloy sheet machining deformation control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139761A (en) * | 2020-08-21 | 2020-12-29 | 成都飞机工业（集团）有限责任公司 | Numerical control machining method for controlling machining deformation of large aluminum alloy wall plate part |
Citations (5)
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|---|---|---|---|---|
| CN103612076A (en) * | 2013-12-04 | 2014-03-05 | 中航飞机股份有限公司西安飞机分公司 | Method for numerical control machining of large aircraft rib parts |
| CN104259774A (en) * | 2014-09-09 | 2015-01-07 | 黄河科技学院 | Plane wing titanium alloy thin-wall web efficient numerical control machining technology |
| CN105312645A (en) * | 2015-12-08 | 2016-02-10 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Method for machining thin web titanium alloy edge strip |
| CN107617853A (en) * | 2017-08-23 | 2018-01-23 | 成都飞机工业（集团）有限责任公司 | A kind of processing method of stainless sheet steel part thickness control |
| CN108188779A (en) * | 2018-01-05 | 2018-06-22 | 清华大学深圳研究生院 | A kind of chucking appliance system for being suitable for large-scale siding class thin-wall part |
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2018
- 2018-11-22 CN CN201811394797.2A patent/CN111203707A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103612076A (en) * | 2013-12-04 | 2014-03-05 | 中航飞机股份有限公司西安飞机分公司 | Method for numerical control machining of large aircraft rib parts |
| CN104259774A (en) * | 2014-09-09 | 2015-01-07 | 黄河科技学院 | Plane wing titanium alloy thin-wall web efficient numerical control machining technology |
| CN105312645A (en) * | 2015-12-08 | 2016-02-10 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Method for machining thin web titanium alloy edge strip |
| CN107617853A (en) * | 2017-08-23 | 2018-01-23 | 成都飞机工业（集团）有限责任公司 | A kind of processing method of stainless sheet steel part thickness control |
| CN108188779A (en) * | 2018-01-05 | 2018-06-22 | 清华大学深圳研究生院 | A kind of chucking appliance system for being suitable for large-scale siding class thin-wall part |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139761A (en) * | 2020-08-21 | 2020-12-29 | 成都飞机工业（集团）有限责任公司 | Numerical control machining method for controlling machining deformation of large aluminum alloy wall plate part |
| CN112139761B (en) * | 2020-08-21 | 2022-01-25 | 成都飞机工业（集团）有限责任公司 | Numerical control machining method for controlling machining deformation of large aluminum alloy wall plate part |
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Application publication date: 20200529 |
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