CN113001121A - Processing method of titanium alloy bowl-shaped thin-wall part - Google Patents

Processing method of titanium alloy bowl-shaped thin-wall part Download PDF

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Publication number
CN113001121A
CN113001121A CN202110277079.2A CN202110277079A CN113001121A CN 113001121 A CN113001121 A CN 113001121A CN 202110277079 A CN202110277079 A CN 202110277079A CN 113001121 A CN113001121 A CN 113001121A
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titanium alloy
bowl
shaped thin
wall part
turning
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Inventor
杨凤
张武成
林彬彬
鲁航
宗绍艳
孙兆亮
何志国
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Harbin Turbine Co Ltd
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Harbin Turbine Co Ltd
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Priority to CN202110277079.2A priority Critical patent/CN113001121A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/50Other automobile vehicle parts, i.e. manufactured in assembly lines

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  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

A processing method of a titanium alloy bowl-shaped thin-wall part relates to a processing method of a thin-wall part. The invention aims to solve the problems of difficult alignment and easy clamping deformation of the existing bowl-shaped titanium alloy thin-wall part processing method. The method comprises the following steps: rough turning: step two: stress relief heat treatment; step three: semi-finish turning; step four: scribing and boring each screw hole on the excircle and each screw hole on the inner boss; step five: finish turning: turning and calibrating each size according to a drawing; step six: marking and milling holes and reamed surfaces at the bowl bottom of the titanium alloy bowl-shaped thin-wall part; the steps of marking and milling each hole and reamed surface at the bottom of the bowl are as follows: firstly, processing a screw hole on the excircle of the titanium alloy bowl-shaped thin-wall part, actually assembling a process bolt by utilizing the processed screw hole, and aligning a milling surface reference according to the centers of the bolt on two sides; step seven: tapping and polishing by a bench worker. The invention is used for turning the bowl-shaped titanium alloy thin-wall part.

Description

Processing method of titanium alloy bowl-shaped thin-wall part
Technical Field
The invention relates to a processing method of a thin-wall part, in particular to a processing method of a titanium alloy bowl-shaped thin-wall part, and belongs to the field of machining.
Background
The wall thickness of a seal head in a novel UV unit of a steam turbine is only 6Mm, the diameter is large, the maximum diameter is 500Mm, the novel UV unit belongs to a typical thin-wall part, the shape of the seal head is similar to a bowl shape, and the seal head is made of titanium alloy which is difficult to machine (the specific structure is shown in figure 1).
When UV unit products are processed, most products are made of titanium alloy materials, and design requirements require that no marking and clamping scratches are allowed on the surface of a workpiece, so that certain difficulty is brought to clamping and alignment. The product processed according to the normal process scheme cannot meet the design requirements (the surface of the workpiece is not allowed to have any scratch) and strict form and position tolerances and dimensional tolerances. Especially for thin-wall parts with bowl-shaped appearance, the clamping deformation risk exists under the special conditions that the diameter of the clamping head is far smaller than the processing diameter and the like, and the product quality is directly influenced.
In conclusion, the existing bowl-shaped titanium alloy thin-wall part processing method has the problems of difficult alignment and easy clamping deformation.
Disclosure of Invention
The invention aims to solve the problems of difficult alignment and easy clamping deformation of the existing bowl-shaped titanium alloy thin-wall part processing method. Further provides a processing method of the titanium alloy bowl-shaped thin-wall part.
The technical scheme of the invention is as follows: a processing method of a titanium alloy bowl-shaped thin-wall part comprises the following steps:
the method comprises the following steps: rough turning:
the method comprises the following steps: clamping the big end, finding the position within 0.1mm, turning each size of the excircle of the small end, and reserving 3mm of allowance on each surface;
the first step is: turning the titanium alloy bowl-shaped thin-walled part, clamping the small end, aligning within 0.05mm, turning each size of the excircle of the large end, and reserving 3mm allowance on each surface;
the clamping step of the small end of the titanium alloy bowl-shaped thin-walled part comprises the following steps:
firstly, mounting one end of a plurality of long rod bolts on a chuck plate by utilizing a process screw hole on the lathe chuck plate, mounting rubber ball head nuts on the end parts of the other ends of the plurality of long rod bolts, and clamping a titanium alloy bowl-shaped thin-wall part on a three-jaw chuck plate of a lathe;
secondly, adjusting the positions of a plurality of long rod bolts to enable the rubber ball head nut to be abutted against the outer circle of the titanium alloy bowl-shaped thin-walled part;
step two: stress relief heat treatment;
step three: semi-finish turning:
step three, firstly: clamping the large end, aligning within 0.05mm, turning each size of the excircle of the small end, and reserving 1mm of allowance on each surface;
step three: turning the titanium alloy bowl-shaped thin-walled part, clamping the small end, aligning within 0.05mm, turning each size of the excircle of the large end and the minimum inner hole, and reserving 1mm of allowance on each surface;
step four: scribing and boring each screw hole on the excircle and each screw hole on the inner boss;
step five: finish turning: turning and calibrating each size according to a drawing;
step six: marking and milling holes and reamed surfaces at the bowl bottom of the titanium alloy bowl-shaped thin-wall part;
the steps of marking and milling each hole and reamed surface at the bottom of the bowl are as follows: firstly, processing a screw hole on the excircle of the titanium alloy bowl-shaped thin-wall part, actually assembling a process bolt by utilizing the processed screw hole, and aligning a milling surface reference according to the centers of the bolt on two sides;
step seven: and (4) tapping and polishing by a bench worker, thus finishing the processing of the titanium alloy bowl-shaped thin-wall part.
Further, in the first step, when the titanium alloy bowl-shaped thin-wall part is clamped on a three-jaw chuck of a lathe, an aluminum sheet is arranged on the inner side wall of the three-jaw chuck.
Further, the alignment method in the first step, the third step and the sixth step is the same, and the specific alignment steps are as follows:
firstly, respectively finding a horizontal center line and a vertical center line of an excircle or an inner hole of a titanium alloy bowl-shaped thin-wall part by using an infrared probe or an edge finder, and determining a tool setting point in the diameter direction by using the intersection point of the two lines;
secondly, when the tool is set at the axial position, the tool is close to the end face of the titanium alloy bowl-shaped thin-walled part but does not contact the end face, and then the clearance gauge is used for measuring the accurate distance between the tool and the workpiece;
and finally, recording the position value of the cutter at the moment, and subtracting the thickness of the feeler gauge to obtain the position of the actual cutter setting point, thereby finishing the alignment work in the axial direction.
Further, the step two also includes that the smallest inner hole is firstly turned, then the rest end surfaces, the inner hole, the inner spherical surface and the fillet are turned, and 2mm allowance is reserved on each surface.
Further, the rough turning parameters in the first step and the second step are both: a is 1.0-1.5, n is 30-50r/min, and F is 0.3-0.5 mm/r.
Further, the finish turning parameters in the first step and the second step are both: a is 0.2-0.6, n is 30-50r/min, and F is 0.15-0.25 mm/r.
And further, the third step includes turning the other end faces, the inner hole, the inner spherical surface and the round angle.
Further, when the inner hole is machined in the second step and the third step, a circle of gauze is wound on the outer circle of the same axial position of the machined inner hole.
Compared with the prior art, the invention has the following effects:
1. the invention needs to clamp the small end to process the large end in the turning process. Because the clamping diameter of a product (a titanium alloy bowl-shaped thin-wall part) is far smaller than the machining diameter, and the machined approximate profile is of a bowl-shaped structure, the traditional center frame cannot be used in the turning process. The use of lengthened jaws also fails to clamp. The special clamping method adopted at the moment is to design a group of lengthened bolts (namely, long rod bolts), one end of each bolt is arranged on the chuck plate by utilizing a process screw hole on the chuck plate, and a group of ball nuts with special materials and shapes are arranged at the other end of each bolt (note that the materials of the nuts are processed by selecting rubber rods). The product is clamped to the apparatus.
By adopting the clamping method, the outer surface of the product can not be scratched in the processing process, the clamping strength can be ensured, and even if the product rotates in the processing process, the long rod bolt also rotates along with the rotation to provide support for the product, so that the form and position tolerance and the size tolerance of the product are ensured.
2. In order to avoid indentation during clamping, a protective layer is required to be arranged between a product and a tool or a clamping jaw. And (4) padding copper sheets according to a traditional method. But a series of oxidation reactions occur with the titanium alloy due to copper when the titanium alloy is processed. Therefore, the material of the protective layer is selected from aluminum, namely aluminum sheet. The problem of clamping indentation can be guaranteed not to appear, and then product processingquality is guaranteed.
3. The original alignment mode before the lathe machining is that the minimum amount of cutting is directly carried out in the diameter direction and the end face, and the tool setting position is determined. Now, in order to meet the design requirements (no scratch is allowed), the original alignment scheme cannot be applied to the processing of the product. The new alignment method is as follows: and respectively finding the horizontal center line and the vertical center line of the outer circle or the inner hole by using an infrared probe or an edge finder, and determining a tool setting point in the diameter direction by using the intersection point of the two lines. When the tool is set in the axial position, the tool is close to the end face but not contacted with the end face, and then the feeler gauge is used for measuring the accurate distance between the tool and the workpiece. And recording the position value of the cutter at the moment, and subtracting the thickness of the feeler gauge to obtain the position of the actual cutter setting point. Thereby completing the axial direction alignment work. The alignment method is suitable for all alignment in the invention, and is convenient for ensuring the processing quality of products.
4. The invention has no alignment reference because the invention can not mark when processing the bottom hole and the spot facing of the bowl. The original process principle (the principle of milling and then drilling) must be broken at this time. Firstly, processing a screw hole on the excircle, actually matching a process screw pin by utilizing the processed screw hole, and aligning the milling surface reference according to the centers of the screw pins on the two sides. The alignment datum is simple and accurate.
5. The invention adopts a new method for avoiding vibration: because the product structure is a thin-wall part, harsh sound is produced due to vibration in the process of processing an inner hole, normal work of peripheral operators is influenced, and the surface roughness of a workpiece is also influenced due to vibration. Because the product is made of titanium alloy, the prior processing examples are few, and the processing experience is insufficient. There is no method for effectively preventing vibration and eliminating a ringing sound. After many experiments, the outer circle of the inner hole is finally wound with a circle of gauze, so that the vibration of the workpiece can be effectively prevented and the harsh sound can be eliminated due to the softness and the adsorbability of the cotton cloth to the cooling liquid.
Drawings
FIG. 1 is a main sectional view of a bowl-shaped titanium alloy thin-wall part.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1, and the method for processing a titanium alloy bowl-shaped thin-walled workpiece of the present embodiment includes the following steps:
the method comprises the following steps: rough turning:
the method comprises the following steps: clamping the big end, finding the position within 0.1mm, turning each size of the excircle of the small end, and reserving 3mm of allowance on each surface;
the first step is: turning the titanium alloy bowl-shaped thin-walled part, clamping the small end, aligning within 0.05mm, turning each size of the excircle of the large end, and reserving 3mm allowance on each surface;
the clamping step of the small end of the titanium alloy bowl-shaped thin-walled part comprises the following steps:
firstly, mounting one end of a plurality of long rod bolts on a chuck plate by utilizing a process screw hole on the lathe chuck plate, mounting rubber ball head nuts on the end parts of the other ends of the plurality of long rod bolts, and clamping a titanium alloy bowl-shaped thin-wall part on a three-jaw chuck plate of a lathe;
secondly, adjusting the positions of a plurality of long rod bolts to enable the rubber ball head nut to be abutted against the outer circle of the titanium alloy bowl-shaped thin-walled part;
step two: stress relief heat treatment;
step three: semi-finish turning:
step three, firstly: clamping the large end, aligning within 0.05mm, turning each size of the excircle of the small end, and reserving 1mm of allowance on each surface;
step three: turning the titanium alloy bowl-shaped thin-walled part, clamping the small end, aligning within 0.05mm, turning each size of the excircle of the large end and the minimum inner hole, and reserving 1mm of allowance on each surface;
step four: scribing and boring each screw hole on the excircle and each screw hole on the inner boss;
step five: finish turning: turning and calibrating each size according to a drawing;
step six: marking and milling holes and reamed surfaces at the bowl bottom of the titanium alloy bowl-shaped thin-wall part;
the steps of marking and milling each hole and reamed surface at the bottom of the bowl are as follows: firstly, processing a screw hole on the excircle of the titanium alloy bowl-shaped thin-wall part, actually assembling a process bolt by utilizing the processed screw hole, and aligning a milling surface reference according to the centers of the bolt on two sides;
step seven: and (4) tapping and polishing by a bench worker, thus finishing the processing of the titanium alloy bowl-shaped thin-wall part.
According to the method, the traditional process scheme is improved according to the material and the structural characteristics of the product, and meanwhile, some special process means are adopted for clamping and aligning and preventing vibration, so that the problem that the surface of the titanium alloy product is not allowed to be scribed (scratches are left) is solved, and the problem that the clamping and aligning are difficult is solved. Meanwhile, the problem of workpiece deformation is solved. Finally, the purpose that the product meets strict design requirements (dimensional tolerance and form and position tolerance) is achieved.
The second embodiment is as follows: referring to fig. 1, the present embodiment will be described, wherein in the first step of the present embodiment, when the titanium alloy bowl-shaped thin-walled workpiece is clamped on a three-jaw chuck of a lathe, an aluminum sheet is mounted on the inner side wall of the three-jaw chuck. So set up, when the aluminum sheet had solved the clamping of three-jaw (holding) chuck, there was the problem of indentation to satisfy strict tolerance requirement. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: referring to fig. 1, the present embodiment is described, and the alignment method in step one, step three and step six of the present embodiment is the same, and the specific alignment steps are as follows:
firstly, respectively finding a horizontal center line and a vertical center line of an excircle or an inner hole of a titanium alloy bowl-shaped thin-wall part by using an infrared probe or an edge finder, and determining a tool setting point in the diameter direction by using the intersection point of the two lines;
secondly, when the tool is set at the axial position, the tool is close to the end face of the titanium alloy bowl-shaped thin-walled part but does not contact the end face, and then the clearance gauge is used for measuring the accurate distance between the tool and the workpiece;
and finally, recording the position value of the cutter at the moment, and subtracting the thickness of the feeler gauge to obtain the position of the actual cutter setting point, thereby finishing the alignment work in the axial direction.
So set up, avoid the mar problem. Other compositions and connections are the same as in the first or second embodiments.
The fourth concrete implementation mode: referring to fig. 1, the first step and the second step of the present embodiment further include turning a minimum inner hole first, so that the minimum inner hole has a minimum amount of visible light; and (4) turning the rest end surfaces, inner holes, inner spherical surfaces and round corners, and reserving 2mm of allowance on each surface. So set up, accomplish the processing of all the other all sizes of product, the minimum light can effectively be avoided thermal treatment to warp in the minimum hole appearance of car. Other compositions and connection relationships are the same as in the first, second or third embodiment.
The fifth concrete implementation mode: referring to fig. 1, the rough turning parameters in step one and step two of the present embodiment are as follows: a is 1.0-1.5, n is 30-50r/min, and F is 0.3-0.5 mm/r. So set up, be convenient for guarantee the rough turning precision.
Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1, and the finish turning parameters in step one and step two of the present embodiment are both: a is 0.2-0.6, n is 30-50r/min, and F is 0.15-0.25 mm/r. So set up, be convenient for guarantee finish turning precision. Other compositions and connection relationships are the same as in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: referring to fig. 1, the third step of the present embodiment further includes aligning the remaining end surfaces, the inner hole, the inner spherical surface and the rounded corner. By the arrangement, the machining precision of each size of the product is finished. Other compositions and connection relationships are the same as in the first, second, third, fourth, fifth or sixth embodiment.
The specific implementation mode is eight: in the second step and the third step of the present embodiment, a circle of gauze is wound around the outer circle of the inner hole at the same axial position when the inner hole is machined. By the arrangement, the problem of vibration during processing is avoided. Other compositions and connection relationships are the same as those of embodiment one, two, three, four, five, six or seven.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A processing method of a titanium alloy bowl-shaped thin-wall part is characterized by comprising the following steps: it comprises the following steps:
the method comprises the following steps: rough turning:
the method comprises the following steps: clamping the big end, finding the position within 0.1mm, turning each size of the excircle of the small end, and reserving 3mm of allowance on each surface;
the first step is: turning the titanium alloy bowl-shaped thin-walled part, clamping the small end, aligning within 0.05mm, turning each size of the excircle of the large end, and reserving 3mm allowance on each surface;
the clamping step of the small end of the titanium alloy bowl-shaped thin-walled part comprises the following steps:
firstly, mounting one end of a plurality of long rod bolts on a chuck plate by utilizing a process screw hole on the lathe chuck plate, mounting rubber ball head nuts on the end parts of the other ends of the plurality of long rod bolts, and clamping a titanium alloy bowl-shaped thin-wall part on a three-jaw chuck plate of a lathe;
secondly, adjusting the positions of a plurality of long rod bolts to enable the rubber ball head nut to be abutted against the outer circle of the titanium alloy bowl-shaped thin-walled part;
step two: stress relief heat treatment;
step three: semi-finish turning:
step three, firstly: clamping the large end, aligning within 0.05mm, turning each size of the excircle of the small end, and reserving 1mm of allowance on each surface;
step three: turning the titanium alloy bowl-shaped thin-walled part, clamping the small end, aligning within 0.05mm, turning each size of the excircle of the large end and the minimum inner hole, and reserving 1mm of allowance on each surface;
step four: scribing and boring each screw hole on the excircle and each screw hole on the inner boss;
step five: finish turning: turning and calibrating each size according to a drawing;
step six: marking and milling holes and reamed surfaces at the bowl bottom of the titanium alloy bowl-shaped thin-wall part;
the steps of marking and milling each hole and reamed surface at the bottom of the bowl are as follows: firstly, processing a screw hole on the excircle of the titanium alloy bowl-shaped thin-wall part, actually assembling a process bolt by utilizing the processed screw hole, and aligning a milling surface reference according to the centers of the bolt on two sides;
step seven: and (4) tapping and polishing by a bench worker, thus finishing the processing of the titanium alloy bowl-shaped thin-wall part.
2. The method for processing the titanium alloy bowl-shaped thin-wall part according to claim 1, wherein the method comprises the following steps: and in the second step, when the titanium alloy bowl-shaped thin-wall part is clamped on a three-jaw chuck of a lathe, an aluminum sheet is arranged on the inner side wall of the three-jaw chuck.
3. The method for processing the titanium alloy bowl-shaped thin-wall part according to claim 2, wherein the method comprises the following steps: the alignment method in the first step, the third step and the sixth step is the same, and the specific alignment steps are as follows:
firstly, respectively finding a horizontal center line and a vertical center line of an excircle or an inner hole of a titanium alloy bowl-shaped thin-wall part by using an infrared probe or an edge finder, and determining a tool setting point in the diameter direction by using the intersection point of the two lines;
secondly, when the tool is set at the axial position, the tool is close to the end face of the titanium alloy bowl-shaped thin-walled part but does not contact the end face, and then the clearance gauge is used for measuring the accurate distance between the tool and the workpiece;
and finally, recording the position value of the cutter at the moment, and subtracting the thickness of the feeler gauge to obtain the position of the actual cutter setting point, thereby finishing the alignment work in the axial direction.
4. The method for processing the titanium alloy bowl-shaped thin-wall part according to claim 3, wherein the method comprises the following steps: and the second step also comprises the steps of firstly turning the smallest inner hole, and then turning the rest end surfaces, the inner hole, the inner spherical surface and the fillet, wherein 2mm of allowance is reserved on each surface.
5. The method for processing the titanium alloy bowl-shaped thin-wall part according to claim 4, wherein the method comprises the following steps: the rough turning parameters in the first step and the second step are as follows: a is 1.0-1.5, n is 30-50r/min, and F is 0.3-0.5 mm/r.
6. The method for processing the titanium alloy bowl-shaped thin-wall part according to claim 5, wherein the method comprises the following steps: the finish turning parameters in the first step and the second step are both as follows: a is 0.2-0.6, n is 30-50r/min, and F is 0.15-0.25 mm/r.
7. The method for processing the titanium alloy bowl-shaped thin-wall part according to claim 6, wherein the method comprises the following steps: and step two, the other end surfaces, the inner hole, the inner spherical surface and the round angle are accurately lathed.
8. The method for processing the titanium alloy bowl-shaped thin-wall part according to claim 7, wherein the method comprises the following steps: and in the second step and the third step, when the inner hole is machined, a circle of gauze is wound on the outer circle of the same axial position of the machined inner hole.
CN202110277079.2A 2021-03-15 2021-03-15 Processing method of titanium alloy bowl-shaped thin-wall part Withdrawn CN113001121A (en)

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CN113601108A (en) * 2021-06-28 2021-11-05 北京航星机器制造有限公司 Processing method of double-sided large-opening variable-thickness titanium alloy thin-wall shell
CN114043168A (en) * 2021-10-26 2022-02-15 河南北方红阳机电有限公司 Machining process for thin-wall cylindrical part with boss in inner hole
CN114043168B (en) * 2021-10-26 2024-01-23 河南北方红阳机电有限公司 Machining process for thin-wall cylindrical part with boss in inner hole

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