CN114985784A - Manual adjusting device for hydraulic tailstock center and turning method for thin-wall frame - Google Patents

Abstract

The invention provides a manual adjusting device for a hydraulic tailstock center and a turning method for a thin-wall frame. According to the manual adjusting device, when the center is arranged on the hydraulic tailstock to prop against a workpiece, the propping force can be manually adjusted, so that the workpiece is prevented from being stressed and deformed due to overlarge pressure of a hydraulic system; by using the manual adjusting device for the hydraulic tailstock center, when the center is arranged on the hydraulic tailstock and is used for propping and processing slender shaft parts, the radial position of the transition sleeve is adjusted to enable the rotation axis of the center to be coaxial with the axis of the main shaft, so that the taper error during processing is avoided.

Description

Hydraulic tailstock top manual adjustment device and turning method of thin-walled frame

technical field

The invention belongs to the field of mechanical processing, and in particular relates to a hydraulic tailstock top manual adjustment device and a turning processing method of a thin-walled frame.

Background technique

The frame is an important part of an aerospace guidance product. This part has a complex structure, poor rigidity, a material removal rate of more than 85%, and strict requirements on size and shape and position accuracy. It is easily affected by clamping force and cutting force during processing. Deformation occurs, resulting in the phenomenon of product size out of tolerance.

In lathe processing, in order to ensure the coaxiality requirements, the two-center mounting and positioning clamping method needs to be used for finishing the outer circle of the steps at both ends in the finishing sequence. The splint is used to cooperate with the front center to drive the workpiece to rotate. The size of the rear top pressing force directly affects the deformation of the workpiece. When the CNC lathe is used for processing, since the tailstock of the CNC lathe is controlled by the hydraulic system, when the hydraulic system is adjusted to the minimum, it still exceeds the strength that the workpiece can bear, causing the workpiece to be significantly deformed, resulting in the shape and position of the workpiece. The accuracy is too poor.

SUMMARY OF THE INVENTION

In view of this, the present invention aims to provide a hydraulic tailstock tip manual adjustment device and a turning processing method for a thin-walled frame, so as to solve the problem that the frame parts in the prior art are difficult to perform CNC turning processing with high precision in size and shape.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

A hydraulic tailstock tip manual adjustment device, comprising a fixed taper shank, a transition sleeve, a movable taper shank, an adjusting screw sleeve and a live center, one end of the fixed taper shank is fixedly connected to a machine tool, and the other end of the fixed taper shank is fixedly connected to the transition One end of the transition sleeve is rotated to connect one end of the adjusting screw sleeve, the inner ring of the adjusting screw sleeve is threadedly connected to the periphery of the movable taper shank, the inner ring of the movable taper shank is inserted into the live center, and the periphery of the live center can be driven by the movable taper shank Slide axially along the inner ring of the transition sleeve.

Further, the transition sleeve is provided with a key hole, the outer periphery of the movable taper shank is provided with a chute along the axial direction, a guide key is installed in the key hole, and an outer periphery of one end of the guide key is located in the chute.

Further, the connecting handle of the live center has a tapered structure, and the inner ring of the movable tapered handle is provided with a tapered hole, and the outer periphery of the connecting handle and the inner ring of the tapered hole have a matching size.

Further, the connecting end of the fixed taper shank is a conical structure, and the conical structure of the connecting end of the fixed taper shank is inserted into the connection hole of the machine tool, and the outer periphery of the fixed taper shank is threadedly connected to the separation nut, and the separation nut is a fixed cone. The opening and closing structure of the handle and the machine tool.

Further, an inner ring of one end of the transition sleeve is provided with an annular groove, one end of the adjusting screw sleeve is fixedly sleeved with the annular boss, the annular boss is slidably connected to the annular groove, and one end of the annular boss is in contact with the limit stop. The other end of the annular boss is in contact with the inner side wall of the transition sleeve, and the limit baffle plate and the transition sleeve are fixedly connected by screws.

Compared with the prior art, the hydraulic tailstock center manual adjustment device of the present invention has the following beneficial effects: when the center is installed on the hydraulic tailstock to support the workpiece, the jacking force can be manually adjusted to avoid excessive pressure caused by the hydraulic system. If the hydraulic tailstock is large, it will cause the workpiece to be deformed by force; using the hydraulic tailstock center manual adjustment device in the present invention, when the center is installed on the hydraulic tailstock to hold and process slender shaft parts, the radial position of the transition sleeve can be adjusted to make the center rotation axis. It is coaxial with the axis of the main shaft to avoid taper errors during processing, and the various tooling devices involved in the present invention have simple structures, convenient process operations and low use costs.

Another object of the present invention is to provide a method for turning a thin-walled frame, so as to solve the problem that the thin-walled frame parts in the prior art are deformed after machining due to the high internal stress of the material.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

A method for turning a thin-walled frame, comprising the following steps:

S1. Clamp the rough blank to the machine tool through three gripping discs, and perform rough machining through the machine tool to obtain a rough product;

S2. Put the crude product into the aging furnace to remove the stress;

S3, the rough product whose stress has been removed in step S2 is clamped and positioned on the machine tool through the disc and the pressure plate, and semi-finished by the machine tool to obtain a semi-finished product;

S4. Put the semi-finished product into a cryogenic processor to remove stress;

S5. Both ends of the semi-finished product whose stress has been removed in step S4 are fixedly installed on the machine tool through the manual adjustment device and the top positioning splint respectively, and the finished product is obtained by the machine tool precision work.

Further, the method of removing the stress through the aging furnace in the step S2 is to put the crude product into the aging furnace and heat it to 120 degrees, keep the temperature for 3 hours, and then remove the crude product and naturally air-cool it.

Further, in the step S4, the method of removing stress by a cryogenic processor is to put the semi-finished product into a cryogenic processor and heat it to 120 degrees, keep the temperature for 2 hours, and then cool down to -60 degrees and keep the temperature for 2 hours.

Further, the finished product includes a first disk, a second disk and a connecting rod, the first disk and the second disk are arranged in parallel with each other, and several connecting rods are arranged between the first disk and the second disk, One end of each connecting rod is fixedly connected to one side of the first disk and one side of the second disk, and the middle of the other side of the first disk is provided with a first clamping column, and the middle of the other side of the second disk A second clamping column is arranged, and a first through hole is respectively provided in the middle of the first clamping column and the second clamping column. The first disc, the second disc, several connecting rods, the first clamping column and the second clamping column are machine The integrated structure is processed, the live center is top-connected into the first through hole of the second clamp column, and the center positioning splint is positioned to locate the periphery of the first clamp column.

Further, the top positioning splint includes a fixed top and a positioning block, the middle of the positioning block is provided with a second through hole, and the positioning block is provided with an opening, the opening is connected to the second through hole, and the periphery of the first clamping column is located in the second through hole. An adjustment bolt is arranged in the hole and in the opening. The adjustment bolt is used to adjust the inner ring size of the second through hole. One end of the fixed tip is abutted into the first through hole of the first clamping column. A slot is arranged on the upper part, a positioning rod is installed on the positioning block, and the periphery of the positioning rod is clamped into the slot.

Compared with the prior art, the method for turning a thin-walled frame according to the present invention has the following advantages: the method is applied in order to remove stress for multiple times, and at the same time, high-precision coaxiality dimensional processing is performed through the top positioning tooling at both ends. The method, as well as the technological measures such as the manual adjustment tooling of the hydraulic tailstock tip of the CNC lathe, can complete the precision turning of the frame parts with high quality and efficiency. The stepped outer circular surfaces at both ends of the frame ensure that the surface roughness requirements of the parts meet the design requirements.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic cross-sectional structure diagram of a hydraulic tailstock tip manual adjustment device according to an embodiment of the present invention;

Fig. 2 is the structural schematic diagram of the product described in the embodiment of the present invention;

3 is a schematic structural diagram of a fixed tip according to an embodiment of the present invention;

4 is a schematic structural diagram of a positioning block according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of the product according to the embodiment of the present invention being fixed to a machine tool through a manual adjustment device and a center positioning splint.

Description of reference numbers:

1-fixed taper shank; 2-transition sleeve; 3-movable taper shank; 4-adjusting screw sleeve; 41-ring boss; 5-live center; 6-guide key; 7-separating nut; 8-limit stop ;9-Screw;10-Finished product;101-First disc; 102-Second disc; 103-Connecting rod; 104-First clamping column; 105-Second clamping column; plate; 112-notch; 12-positioning block; 121-second through hole; 122-opening; 123-adjustment bolt; 124-positioning rod.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figure 1, the hydraulic tailstock top manual adjustment device includes a fixed taper shank 1, a transition sleeve 2, a movable taper shank 3, an adjusting screw sleeve 4 and a live center 5. One end of the fixed taper shank 1 is fixedly connected to the machine tool. The other end of the fixed taper shank 1 is fixedly sleeved with the transition sleeve 2, and one end of the transition sleeve 2 is rotated and sleeved with one end of the adjusting screw sleeve 4, and the inner ring of the adjusting screw sleeve 4 is threadedly connected to the periphery of the movable taper shank 3, and the movable taper shank 3. The inner ring is inserted into the live center 5, the transition sleeve 2 is provided with a key hole, the outer periphery of the movable taper shank 3 is provided with a chute along the axial direction, and a guide key 6 is installed in the key hole, and one end of the guide key 6 The connecting shank of the top 5 has a tapered structure, and the inner ring of the movable taper shank 3 is provided with a tapered hole. The outer periphery of the connecting shank and the inner ring of the tapered hole are the matching size. When the top is installed on the hydraulic tailstock to hold the workpiece, it can be Manually adjust the jacking force to avoid the workpiece being deformed due to excessive pressure of the hydraulic system; using the hydraulic tailstock tip manual adjustment device in the present invention, the tip jacking can be installed on the hydraulic tailstock for processing slender shafts When making parts, by adjusting the radial position of the transition sleeve 2, the axis of rotation of the top and the axis of the main shaft are coaxial, so as to avoid taper error during processing, and the various tooling structures involved in the present invention are simple in structure, convenient in process operation and low in use cost.

The connecting end of the fixed taper shank 1 is a tapered structure, and the conical structure of the connecting end of the fixed taper shank 1 is inserted into the connecting hole of the machine tool, and the outer thread of the fixed taper shank 1 is connected to the separation nut 7. The tailstock is withdrawn to the tail of the machine tool, and the separation nut 7 is rotated, and the end face of the separation nut 7 is pressed against the end face of the tapered hole of the machine tool tailstock to remove the device from the tailstock.

An inner ring of one end of the transition sleeve 2 is provided with an annular groove, one end of the adjusting screw sleeve 4 is fixedly sleeved with the annular boss 41, the annular boss 41 is slidably connected to the annular groove, and one end of the annular boss 41 is in contact with the limit stop The plate 8, the other end of the annular boss 41 is in contact with the inner side wall of the transition sleeve 2, and the limit baffle 8 and the transition sleeve 2 are fixedly connected by screws 9.

As shown in Fig. 1-Fig. 5, the manual adjustment device is used to carry out the turning processing method of the thin-walled frame, so as to solve the numerical control turning processing of the frame parts with high precision in size and shape. The invention and application of the process route of stress removal in multiple sequences, the high-precision coaxiality dimension processing method, the manual adjustment tooling of the hydraulic tailstock tip of the CNC lathe and other technological measures ensure that the processing of the frame parts fully meets the design index requirements. method, including the following steps:

S1. Clamp the rough blank to the machine tool through the three gripping discs, and perform rough processing through the machine tool to obtain a rough product. The rough product corresponding to the finished product 10 should meet the unilateral flow rate of each part of the outer contour of more than 1mm;

S2. Put the crude product into the aging furnace to remove the stress. The method of stress removal in this step is to put the crude product into the aging furnace and heat it to 120 degrees, keep the temperature for 3 hours, and then remove the crude product and cool it in natural air.

S3. The rough product with the stress removed in step S2 is clamped and positioned on the machine tool through the disc and the pressure plate, and semi-finished by the machine tool to obtain the semi-finished product. The semi-finished product corresponding to the finished product 10 should meet the peripheral contour allowance of each part of 0.25 mm, and the semi-finished product Both ends need to be machined with a center hole;

S4. Put the semi-finished product into a cryogenic treatment machine to remove stress. The method for stress removal in this step is to put the semi-finished product into a cryogenic treatment machine and heat it to 120 degrees, keep the temperature for 2 hours, then cool down to -60 degrees and keep it warm for 2 hours, and the above operation cycle twice.

S5. Repair the center holes at both ends of the semi-finished product whose stress has been removed in step S4. The two ends are respectively fixed to the machine tool through the manual adjustment device and the top positioning splint. Through the precision work of the machine tool, the dimensions of the precision turning meet the tolerance requirements of the drawings, and the finished product is obtained. 10.

As shown in FIG. 2, the finished product 10 includes a first disc 101, a second disc 102 and a connecting rod 103. The first disc 101 and the second disc 102 are arranged parallel to each other, and the first disc 101 and the second disc 101 Several connecting rods 103 are arranged between the disks 102, one end of each connecting rod 103 is fixedly connected to one side of the first disk 101 and one side of the second disk 102, and the other side of the first disk 101 is arranged in the middle The first clamping column 104 and the second clamping column 105 are arranged in the middle of the other side of the second disc 102, and the first clamping column 104 and the middle of the second clamping column 105 are respectively provided with first through holes. The first disc 101, The second disc 102 , several connecting rods 103 , the first clamping column 104 and the second clamping column 105 are integrally machined structures. The live center is connected to the first through hole of the second clamping column 105 , and the center positioning clamping plate is used for Position and clamp the periphery of the first clamping post 104 .

As shown in FIG. 3 and FIG. 4 , the top positioning splint includes a fixed top 11 and a positioning block 12. A second through hole 121 is formed in the middle of the positioning block 12, and an opening 122 is formed on the positioning block 12. The opening 122 communicates with the second through hole 122. Hole 121, the periphery of the first clamping column 104 is located in the second through hole 121, and the opening 122 is provided with an adjustment bolt 123, the adjustment bolt 123 is used to adjust the size of the inner ring of the second through hole 121, and one end of the fixed center 11 is abutted to the first through hole 121. In the first through hole of a clamping column 104 , a fixing plate 111 is arranged on the periphery of the fixing tip 11 , a slot 112 is arranged on the fixing plate 111 , a positioning rod 124 is installed on the positioning block 12 , and the periphery of the positioning rod 124 is clamped to the slot 112 Inside.

Fixing the semi-finished product with the above manual adjustment device and the top positioning splint can ensure the coaxiality of the first clamping column 104 and the second clamping column 105 during processing, and ensure that the first clamping column 104 and the second clamping column 105 located at both ends of the finished product 10 . The coaxiality dimension processing guarantee method is:

In the finishing process, the outer edge of the first clamping column 104 at the left and right ends, the outer circle of the second clamping column 105 and the coaxiality requirements relative to the reference axis φ0.006 mm should be strictly guaranteed. After clamping the semi-finished product by using a chuck, synchronous processing The fixed top 11 is positioned, and cooperates with the positioning block 12 installed at the first clamping column 104 to drive the parts to rotate, and the manual adjustment device installed on the tailstock uses the center holes at both ends as the positioning surface to carry out the turning of each surface of the outer circle, This mainly relies on the manual adjustment device and the top positioning splint to realize the clamping and positioning of the semi-finished product.

As shown in Figures 3 and 4, the three-jaw chuck clamps a fixed center 11 made of 45-gauge steel quenched material with a diameter of 30 mm, and the cone angle of the center is 60 degrees. Before using the fixed center 11 for positioning and processing, the center must be processed online. The taper angle is adjusted to ensure that the fixed top 11 has the smallest runout relative to the rotation axis of the machine tool spindle.

The fixing plate 111 in the middle section of the fixed top 11 has a slot 112, and the positioning rod 124 on the positioning block 12 is inserted into the slot 112 to drive the positioning block 12 to rotate. One end of the hole in the center of the positioning block 12 is in the state of opening 122. The adjustment bolts 123 on the side realize the tightening and opening of the opening 122 , so as to fix the positioning block 12 with the outer circumference of the first clamping column 104 .

The second through hole 121 of the positioning block 12 is in clearance fit with the outer circle of the first clamping column 104 of the finished product 10 , and the matching clearance is less than 0.02 mm, so as to prevent the positioning block 12 from pinching the surface of the finished product 10 when clamping parts.

How to use the hydraulic tailstock top manual adjustment device:

There is an external thread on the periphery of the fixed taper shank 1, and the separation nut 7 is matched with it, and the fixed end of the fixed taper shank 1 adopts Morse No. 4 external cone, which is matched with the taper hole of the machine tool tailstock; 2. Clearance fit (gap 0.1~0.3mm, used to adjust the center of the center and the axis of rotation of the main shaft to be coaxial), the fixed taper shank 1 and the transition sleeve 2 are connected and fixed by 4 screws 9 in the circumferential direction.

The inner hole of the transition sleeve 2 is matched with the outer circle of the movable taper shank 3, and the clearance is controlled within 0.02mm. The guide key 6 installed in the hole is matched with the outer circle key groove of the movable taper shank 3, so that the movable taper shank 3 can be able to be in the transition sleeve 2. Perform linear sliding; limit the outer annular boss 41 at the end of the adjusting screw sleeve 4 to the annular groove on the inner ring at the end of the transition sleeve 2, so that the adjusting screw sleeve 4 can rotate flexibly in the transition sleeve 2, and the inner hole of the movable taper shank 3 is Morse No. 2 taper hole is used to install the live center 5, and the outer thread of the movable taper shank 3 is connected with the inner thread of the adjusting screw sleeve 4; when in use, rotating the adjusting screw sleeve 4 can make the live center 5 along the transition sleeve 2. The ring slides axially.

When turning frame parts, follow the machining process steps to remove material allowances and machining stresses step by step. The finishing process is based on the coaxiality dimension processing guarantee method, using the front center with a special splint and a hydraulic tailstock center manual adjustment device, and finally using the installation and positioning method of the two centers to realize the turning of the frame parts on the CNC lathe.

After the parts are processed, withdraw the tailstock to the tail of the machine tool, rotate the separation nut 7, and remove the device from the tailstock by pressing the end face of the separation nut 7 against the end face of the taper hole of the machine tool tailstock.

During the implementation of the hydraulic tailstock top manual adjustment device, when using the hydraulic tailstock to hold and process slender shaft parts, the adjusting screw sleeve 4 can be manually rotated at any time to adjust the top holding force according to the thermal elongation changes during processing. In the processing of slender shafts, if the axis of the center is not coaxial with the axis of the main shaft, the four screws 9 can be slightly loosened, the two axes can be made coaxial by adjusting the transition sleeve 2, and then the screws 9 can be tightened.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (9)

1. The hydraulic tailstock top manual adjustment device is characterized in that: it includes a fixed taper shank (1), a transition sleeve (2), a movable taper shank (3), an adjusting screw sleeve (4) and a live center (5), a fixed taper One end of the shank (1) is fixedly connected to the machine tool, the other end of the fixed taper shank (1) is fixedly sleeved with the transition sleeve (2), and one end of the transition sleeve (2) is rotated and sleeved with one end of the adjusting screw sleeve (4), The inner ring of the adjusting screw sleeve (4) is threadedly connected to the periphery of the movable taper shank (3), and the inner ring of the movable taper shank (3) is inserted into the live center (5). (3) The periphery is provided with a chute along the axial direction, the guide key (6) is installed in the key hole, and the periphery of one end of the guide key (6) is located in the chute. Slide axially along the inner ring of the transition sleeve (2). 2. The hydraulic tailstock tip manual adjustment device according to claim 1, characterized in that: the connecting handle of the live center (5) is a conical structure, and the inner ring of the movable conical handle (3) is provided with a conical hole, which connects the The outer circumference of the shank and the inner ring of the tapered hole are the matching size. 3. The hydraulic tailstock tip manual adjustment device according to claim 1, wherein the connecting end of the fixed taper shank (1) is a conical structure, and the conical structure of the connecting end of the fixed taper shank (1) is inserted into the In the connection hole of the machine tool, the periphery of the fixed taper shank (1) is threadedly connected to the separation nut (7), and the separation nut (7) is an opening and closing structure of the fixed tapered shank (1) and the machine tool. 4. The hydraulic tailstock top manual adjustment device according to claim 1, characterized in that: an inner ring of one end of the transition sleeve (2) is provided with an annular groove, and one end of the adjusting screw sleeve (4) is fixedly sleeved with the annular boss ( 41), the annular boss (41) is slidably connected to the annular groove, one end of the annular boss (41) is in contact with the limiting baffle (8), and the other end of the annular boss (41) is in contact with the transition sleeve The inner side wall of (2), the limit baffle plate (8) and the transition sleeve (2) are fixedly connected by screws (9). 5. The turning machining method of the thin-walled frame is carried out by applying the manual adjustment device according to any one of claims 1-4, characterized in that: it comprises the steps: S1. Clamp the rough blank to the machine tool through three gripping discs, and perform rough machining through the machine tool to obtain a rough product; S2. Put the crude product into the aging furnace to remove the stress; S3, the rough product whose stress has been removed in step S2 is clamped and positioned on the machine tool through the disc and the pressure plate, and semi-finished by the machine tool to obtain a semi-finished product; S4. Put the semi-finished product into a cryogenic processor to remove stress; S5. The two ends of the semi-finished product whose stress has been removed in step S4 are fixedly installed on the machine tool through the manual adjustment device and the top positioning splint, respectively, and the finished product (10) is obtained by the machine tool precision work. 6. the turning processing method of thin-walled frame according to claim 5, is characterized in that: the method that step S2 removes stress by aging furnace is, put crude product into aging furnace and heat to 120 degrees, keep warm for 3 hours, The crude product is then removed for natural air cooling. 7. the turning processing method of thin-walled frame according to claim 5, is characterized in that: step S4 is by cryogenic treatment machine to remove the method of stress, is, put semi-finished product into cryogenic treatment machine and be heated to 120 degrees, be kept warm for 2 hours, Then cool down to -60 degrees and keep warm for 2 hours. 8. The method for turning a thin-walled frame according to claim 6, wherein the finished product (10) comprises a first disc (101), a second disc (102) and a connecting rod (103), the first The disc (101) and the second disc (102) are arranged parallel to each other, and several connecting rods (103) are arranged between the first disc (101) and the second disc (102), and each connecting rod (103) One end is fixedly connected to one side of the first disc (101) and one side of the second disc (102), and the middle of the other side of the first disc (101) is provided with a first clamping column (104), A second clamping column (105) is arranged in the middle of the other side of the two discs (102), and a first through hole is respectively provided in the middle of the first clamping column (104) and the second clamping column (105). 101), the second disc (102), several connecting rods (103), the first clamping column (104) and the second clamping column (105) are machined integral structures, and the live center (5) is top-connected to the second clamping column In the first through hole of the column (105), the top positioning clamping plate is used for positioning the periphery of the first clamping column (104). 9. The method for turning a thin-walled frame according to claim 8, characterized in that: the center positioning splint comprises a fixed center (11) and a positioning block (12), and the middle of the positioning block (12) is provided with a second through hole ( 121), and the positioning block (12) is provided with an opening (122), the opening (122) communicates with the second through hole (121), the periphery of the first clamping post (104) is located in the second through hole (121), and the opening (122) An adjustment bolt (123) is arranged in the (122), and the adjustment bolt (123) is used to adjust the size of the inner ring of the second through hole (121). In a through hole, a fixing plate (111) is arranged on the periphery of the fixing top (11), a slot (112) is arranged on the fixing plate (111), a positioning rod (124) is installed on the positioning block (12), and the positioning rod (124) The periphery of the notch is snapped into the slot (112).

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