CN115055847A - Flexible positioning and clamping device for making gaps in large and medium-sized arc-shaped thin-walled parts and method for making gaps - Google Patents

Abstract

The invention discloses a flexible positioning and clamping device for manufacturing a notch of a large and medium-sized n-shaped arc-shaped thin-walled part and a manufacturing method of the notch, wherein the clamping device comprises a base, an arc-shaped positioning plate and an inclined support, the radian of an arc surface at the upper part of the arc-shaped positioning plate is consistent with that of the arc-shaped thin-walled part, and the arc-shaped positioning plate is vertically fixed on the base through the inclined support; the arc-shaped positioning plate is further provided with a transverse fixing device and a radial fixing device, the transverse fixing device is used for positioning and clamping a workpiece in the thickness direction, and the radial fixing device is used for fixing the workpiece in the radial direction. The clamping device has the advantages of reasonable structure, reliable positioning and clamping, effective flame discharge, slag discharge and thermal deformation control, convenient use, strong universality, small part deformation, good consistency, stable and controllable quality, and no notch out-of-tolerance phenomenon in batch production compared with the original scheme; the notch processing efficiency of the part is improved by about 80 percent, and the production cost is obviously reduced.

Description

Flexible positioning and clamping device for making gaps in large and medium-sized arc-shaped thin-walled parts and How to make a gap

technical field

The invention belongs to the field of processing after forming various thin-walled parts in aerospace, and particularly relates to a flexible positioning and clamping device for making gaps in large and medium-sized arc-shaped thin-walled parts and a method for making the gaps.

Background technique

In the field of aerospace equipment, the "ji"-shaped thin-walled parts are one of the important radial load-bearing parts of the rocket body. Its structural characteristics are thin wall, arc-shaped, "ji"-shaped cross-section, different widths and sizes, and the diameter There are notches and sags of different sizes and types in the direction to pass through the profile parts. For a long time, the processing methods of cutting and drilling, template drilling positioning holes and punching punching of "ji"-shaped thin-walled parts have been used. This method has large deformation of parts, poor notch position accuracy, easy to produce cracks during punching, and product consistency. And the quality stability is poor, the manufacturing efficiency is low, and the skill level of the operator is high, and each type of notch is equipped with a corresponding notch die, and each different part is equipped with a corresponding cutting template. Frequent but low use rate brings difficulties to the management of molds and templates, and the long service life of such parts has led to an increase in the defective rate and scrap rate of such parts, which are no longer suitable for production needs, and need to re-produce notched dies and cutting templates. , but the quantity is large and the cost is high.

Three-dimensional five-axis laser cutting machine is a high-end equipment developed for the sheet metal stamping industry in recent years. It is mainly used for laser cutting of three-dimensional sheet metal components. It has the characteristics of high efficiency and high precision, and can be applied to the shape and shape of the final product. The processing of holes can meet the requirements of high quality and high efficiency processing. The difficulty of laser cutting of "ji"-shaped arc thin-walled parts is that the width and size of the parts are not the same, which brings difficulties to the positioning, control of cutting deformation and alignment of the parts.

After searching, no institution or scholar in China has published patents related to three-dimensional five-axis laser cutting processing of "ji"-shaped thin-walled parts. The research carried out by the chemical structure design and process optimization, related articles are: Guo Jianjun et al. published an article in the journal "Forging Technology" entitled "Parts Forming Process Improvement and Notch Die Design", Shan Chao et al. in "Aerospace" "Manufacturing Technology" published an article entitled "Modular Structure Design and Application of Typical Part Notch Cutting and Drilling Models".

In summary, when processing large and medium-sized arc-shaped thin-walled parts, the following technical problems need to be solved urgently:

Realize that the cross-section is in the shape of a "ji", and the thin-walled parts with an arc less than 95 degrees can complete the laser cutting of all gaps in one clamping; solve the problems of excessive gaps, punching cracks, low manufacturing efficiency and low pass rate in the original solution ; Solve the problem of large investment in the new die and cutting model according to the original plan; solve the processing of the gap of the "ji" arc thin-walled parts with different widths and sizes, and realize the characteristics of flexible production; ensure the gap of the "ji" arc thin-walled parts The limit deviation between the position and the theoretical line is ±1mm, which meets the requirements of stable and controllable quality; realizes reliable radial compression, solves the problem of large gap deviation caused by the difference in the radian accuracy of the "ji" arc thin-walled parts, and reduces the correction difficulty.

SUMMARY OF THE INVENTION

In order to solve the problems of poor quality control reliability, low pass rate, time-consuming and laborious process of drilling positioning holes, and large investment in newly-made punching dies and cutting and drilling templates, the present invention is fully While applying the flexibility of the three-dimensional five-axis laser cutting machine, it also provides a flexible positioning and clamping device for "ji"-shaped arc thin-walled parts, which realizes one-time positioning and clamping of "ji" arc-shaped thin-walled parts with different widths. The processing of all notches and holes is completed, and the positioning device, the radial pressing device, the positioning device and the clamping device with different widths are provided. The invention can significantly improve the processing efficiency, reduce the investment, and reduce the labor intensity. Product consistency and quality stability are effectively controlled, significantly improving product quality and qualification rate.

The specific scheme of the present invention is:

A flexible positioning and clamping device for making gaps in large and medium-sized arc-shaped thin-walled parts. The clamping device includes a base, an arc-shaped positioning plate, and an inclined support. The arc of the upper arc surface of the arc-shaped positioning plate is the same as the The arcs of the arc-shaped thin-walled parts are kept the same, and the arc-shaped positioning plate is vertically fixed on the base through the diagonal support; the arc-shaped positioning plate is also provided with a lateral fixing device and a radial fixing device, and the lateral fixing device is used for The positioning and clamping of the parts in the thickness direction, the radial fixing device is used to fix the parts in the radial direction; the two sides of the arc-shaped positioning plate are provided with arc-shaped grooves, and the arc-shaped grooves are spaced apart from each other. Several pairs of positioning pads are arranged, and asbestos plates are arranged between the positioning pads and the arc groove.

In the flexible positioning and clamping device of the present invention for making gaps in large and medium-sized arc-shaped thin-walled parts, in each set of positioning pads, one side of the positioning pad is provided with a stepped hole, and the opposite side is provided with a stepped hole. There are threaded holes and through holes at the corresponding positions of the arc-shaped positioning plates, and the positioning pads on both sides are fixed to the arc-shaped grooves by bolts, and the positioning pads are provided with different thickness specifications, which can be Match according to the different inner dimensions of the parts.

The flexible positioning and clamping device of the present invention used for the manufacture of gaps in large and medium-sized arc-shaped thin-walled parts is also equipped with an arcuate clamp at each group of positioning pads, which can press and fix the arc-shaped parts on the arc-shaped part. one end of the bow-shaped clip is provided with a widened flat surface, which can be closely attached to the outer surface of one side of the zigzag part; the other end of the bow-shaped clip is provided with a horizontal bolt hole, and is matched with There are wide foot bolts, which can be pressed from the other side by adjusting the wide foot bolts.

The flexible positioning and clamping device of the present invention is used for the manufacture of gaps in large and medium-sized arc-shaped thin-walled parts. The radial pressing device includes a support rod, a tension plate and a steel rod. The arc groove of the arc positioning plate is crossed horizontally, and the pressing pad is placed on the figure-shaped part, the support rod is placed on the pressing pad, and the tension plate covers the steel rod and the supporting rod from both sides at the same time. Hold and compress the parts radially.

In the flexible positioning and clamping device of the present invention, which is used for making gaps in large and medium-sized arc-shaped thin-walled parts, the tension plate is provided with hanging holes at the upper end and hooks at the lower end, and two ends of the support rod are respectively sleeved into two The hanging holes of the tension plate, the hooks at the lower ends of the two tension plates hook the ends of the steel bars to radially fix the parts.

In the flexible positioning and clamping device used for the manufacture of gaps in large and medium-sized arc-shaped thin-walled parts according to the present invention, the radial pressing device further comprises a pressing pad and a top pressing bolt. Between the support rod and the workpiece, a horizontal screw hole is arranged in the middle of the support rod, and the pressing bolt is screwed down from the screw hole of the support rod to bear against the pressing pad to achieve radial compression of the workpiece.

In the flexible positioning and clamping device of the present invention, which is used for the manufacture of gaps in large and medium-sized arc-shaped thin-walled parts, the oblique support is in the shape of a right-angled triangle, and the two right-angled sides are provided with skirts for connection and fixation. The skirt is fixedly connected with the base and the arc-shaped positioning plate by bolts; the base is provided with positioning pin holes, which can be fixed on the machine tool table through the positioning pins.

A manufacturing method of using a flexible positioning and clamping device for the notch of large and medium-sized arc-shaped thin-walled parts, comprising the following steps:

Step 1: Use the workpiece notch detection template to draw the notch shape line of the first product; select the positioning pad with the corresponding thickness according to the inner size of the workpiece; place the workpiece on the arc positioning plate to determine the positioning pad and radial The installation position and quantity of the pressing device, the installation position of the positioning pad and the radial pressing device should be between the two adjacent notches to be processed;

Step 2: Remove the parts and install asbestos plates in the arc grooves on both sides of the arc positioning plate; then install the positioning pads in the arc grooves of the arc positioning plate;

Step 3: Insert the steel rod of the radial pressing device into the round hole under the arc groove of the arc-shaped positioning plate; place the workpiece on the arc-shaped positioning plate again, and take the radial pressing device to compress the workpiece On the arc positioning plate; use the bow clamp to clamp the thickness direction of the workpiece at the position of the positioning pad;

Step 4: 3D modeling of parts; generate laser cutting program, coordinate transformation, find out whether there is interference between the laser cutting head and the invented device, and modify the laser cutting program;

Step 5: Position the program with the outline of the notch drawn in step 1, record the coordinate points, run the cutting program manually, check whether the laser cutting head interferes with the inventive device and modify the laser cutting program;

Step 6: Return to the starting point of the laser cutting program, start the laser cutting program to complete the first piece processing, and return the laser cutting head to the absolute coordinate origin of the laser machine; remove the workpiece and check the correctness of the gap, and adjust the cutting as needed program;

Step 7: Take the second piece and automatically complete the cutting and processing of subsequent products;

In the method for manufacturing a notch of a large and medium-sized arc-shaped thin-walled part by using a flexible positioning and clamping device according to the present invention, when processing a sag-containing part, in step 1, the method further comprises: according to the sag size of the part. The steps of selecting the corresponding sag positioning block and quantity, and installing the sag positioning block on the corresponding position before and after the arc positioning plate; and placing the workpiece on the arc positioning plate, and the product sag is aligned with the sag positioning block.

The present invention provides a method for making gaps in large and medium-sized arc-shaped thin-walled parts by using a flexible positioning and clamping device. The number of pressing devices should be 3 to 4.

Device composition and principle:

The device consists of a base, an arc-shaped positioning plate, an oblique support, a positioning backing plate, a radial pressing device, a special subsidence positioning block, an asbestos plate and a bow-shaped clamp.

The function of the base is to support the device and parts of the invention, and the lower part is connected to the machine tool. The device is connected into a whole by bolts, and the cylindrical pin hole is used for the positioning of the inventive device on the machine tool table, so as to ensure the consistency of the position of the inventive device in each use.

The arc surface of the arc-shaped positioning plate is the positioning surface, which is used for the radial positioning of the parts. There is an arc-shaped groove under the positioning surface, and through holes are made in the groove. The positioning pad and asbestos plate in the thickness direction are installed in the arc-shaped groove. Inside, the positioning pad is used for positioning and clamping in the thickness direction of the parts, and the asbestos plate acts as a heat insulation to prevent laser damage to the arc positioning plate and the device from thermal deformation. The arc positioning of the notch of the sagging "ji" arc-shaped thin-walled part shall be determined according to the product drawing.

The radial pressing device adopts a top-pressing structure, which consists of top-pressing bolts, support rods, pressing pads, tension plates and steel bars. The parts are pressed on the positioning surface of the arc-shaped positioning plate through the top-pressing bolts and the pressing pads. above. By pressing, the error between the part and the positioning surface of the arc-shaped positioning plate can be reduced, the radial deformation of the part can be avoided during the cutting process, and the product quality can be effectively controlled.

The bow clamp is an outsourced part. It cooperates with the front and rear positioning pads when in use, and clamps the part from the outer side of the part in the thickness direction to prevent the part from being deformed in the thickness direction during the cutting process.

Through the above-mentioned flexible positioning and clamping device and related processing methods, the following beneficial effects can be achieved:

The device of the invention has reasonable structure, reliable positioning and clamping, effective flame and slag discharge and thermal deformation control, convenient use and strong versatility;

The invention significantly improves product quality: after production verification, the parts have small deformation, good consistency, stable and controllable quality, and compared with the original plan, there is no gap and out-of-tolerance phenomenon in batch production;

The invention significantly improves the production efficiency: compared with the original scheme, the drilling process, the secondary punching process, the frequent assembling and disassembling the punching die and the borrowing time of the drilling template are cancelled, and the machining efficiency of the part notch is increased by about 80%;

The invention significantly reduces the production cost: compared with the original plan, the cutting and drilling template and the notch die are eliminated, which saves the cost of new cutting and drilling template and notch punching die. Reduced manufacturing costs.

The processing process of the present invention can be started with one key, program control, low labor intensity, safety and reliability, and low requirements on the skill level of operators.

Description of drawings

Figure 1-1 is the first use state diagram of the positioning and clamping device of the present invention;

Figure 1-2 is the second use state of the positioning and clamping device of the present invention;

Figures 1-3 are Figure 3 of the use state of the positioning and clamping device of the present invention;

Fig. 2-1 is a partial enlarged view 1 of the lateral fixing device of the positioning and clamping device of the present invention;

Fig. 2-2 is a partial enlarged view of the lateral fixing device of the positioning and clamping device of the present invention;

Fig. 3-1 is a partial enlarged view 1 of the radial fixing device of the positioning and clamping device of the present invention;

Fig. 3-2 is a partial enlarged view of the radial fixing device of the positioning and clamping device of the present invention;

FIG. 4 is a partial schematic diagram of the subsidence positioning device and installation of the positioning and clamping device of the present invention;

5 is a schematic diagram of a typical product without subsidence of the present invention;

FIG. 6 is a schematic diagram of a typical product with sag according to the present invention.

Reference numerals: 1 inclined support, 2 base, 3 bow clip, 4 arc positioning plate, 5 positioning pad, 6 asbestos plate, 7 connecting screw between the arc positioning plate and the base, 8 steel rod, 9 arc pressure plate, 10 Support rod, 11 top pressure bolt, 12 tension plate, 13 sunken positioning block, 14 connecting screw of sunken positioning block and arc positioning plate, 15 product outline, 16 inclined support and arc positioning plate connecting screw and base connecting screw, 17 Positioning pin holes, 18 Lifting bolts, 19 Product contours to be cut, 41 Arc grooves, 42 Through holes for installing positioning pads, 43 Through holes for steel rods 8 to pass through, 31 and bow clips 3 Matching wide foot bolts.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technology of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The inventive device adopts a vertical structure design on the basis of fully considering the cutting range of the laser cutting machine, the manufacturing cost, production cycle, quality control and convenient operation of the inventive device. The main structure of the device is composed of a base 2, an arc-shaped positioning plate 4, and an oblique support 1. The three are combined into a whole by means of cylindrical head inner hexagonal bolts, and are also equipped with lifting bolts 18 and positioning pin holes 17. It is installed on the machine table for movement and positioning; the arc-shaped positioning plate 4 is equipped with a thickness-direction positioning pad 5, an asbestos plate 6, a radial pressing device, a special subsidence positioning block 13 and an arcuate clamp 3, all of which are the invention. The key accessories of the device play the role of positioning, clamping, protection and slag discharge of parts. The main structure is shown in Figure 1.

Based on the base 2, the clamping device is adjusted in place on the laser cutting machine worktable, so that the positioning pin hole 17 corresponds to the pin hole on the worktable, and then the positioning pin is inserted to fix it to avoid displacement and improve machining accuracy. The side of the base is equipped with four corresponding lifting bolts 18, and the upper surface of the base 2 is provided with a groove (not shown in the figure) according to the contour of the arc-shaped positioning plate 4, and the arc-shaped positioning plate 4 is installed in the groove. It is beneficial to stabilize the arc-shaped positioning plate 4 . The side of the arc-shaped positioning plate 4 is equipped with an inclined support 1, and the arc-shaped positioning plate 4, the inclined support 1 and the base 2 are connected by bolts. After the combination, the base 2 should be perpendicular to the arc-shaped positioning plate 4;

The arc-shaped positioning plate 4 is mainly used to install the positioning device, the radial pressing device and the asbestos plate 6 for protection, realize the positioning of the parts in the radial direction and thickness direction, realize the function of supporting and pressing the parts, and realize the parts in the laser cutting machine. The consistency of the spatial position on the worktable ensures that the product positioning accuracy is controllable and the cutting deformation is effectively controlled.

The arc-shaped positioning plate 4 is a flat plate structure, and the thickness is determined according to the distance between the minimum inner size of the workpiece and the thickness direction of the product and the arc-shaped positioning plate 4. The upper surface is an arc surface, which is used as the positioning surface of the workpiece. The radial positioning, support and clamping of the parts, the rounded edges of the arc surface to prevent the parts from being gnawed, the arc grooves 41 are formed on both sides of the arc positioning plate 4, and the arc chamfering at the bottom of the arc groove 41, In order to facilitate the slag to fall, through holes 42 are provided at intervals in the arc groove 41 for installing the positioning pad 5 and the asbestos plate 6, and a threaded hole (not shown in the figure) is provided on the outside of the arc groove 41. , used to install the sag positioning block 13, which can only be used when processing sag parts. The position of the threaded hole is designed according to the sag position of the product pattern, and a through hole 43 is provided under the arc-shaped groove 41. The through hole 43 is used to pass through the steel rod 8 and is used to install the radial pressing device.

The positioning pad 5 is a flat plate member, which is symmetrically arranged in the arc grooves 41 on both sides of the arc positioning plate 4. One piece is made with step holes 51, and the other piece is made with threaded holes 52, which are installed with cylindrical head socket screws. In the arc-shaped grooves 41 on both sides of the arc-shaped positioning plate 4, its function is to cooperate with the arcuate clamp 3 to realize the positioning and clamping of the parts in the thickness direction. The inner size of the device is configured with positioning pads 5 of different thicknesses, which reflects the characteristics of flexible manufacturing of the device of the invention.

A bow-shaped clip 3 is also provided at each set of positioning pads 5, which can press and fix the several-shaped product on the arc-shaped positioning plate 4; one end of the bow-shaped clip 3 Close to the outer surface of one side of the zigzag product; the other end of the arch clamp 3 is provided with a transverse bolt hole (not shown in the figure), and is provided with a wide foot bolt 31. By adjusting the wide foot bolt 31 from On the other side, press the figure-shaped parts.

The subsidence positioning block 13 is specially configured for the notch containing the subsidence, which is an extension of the function of the device of the invention. The positions of the threaded holes in the arc-shaped grooves 41 on both sides of the arc-shaped positioning plate 4 are determined according to the product drawings.

The radial pressing device is composed of top pressing bolt 11, support rod 10, tension plate 12, arc pressing plate 9 and steel rod 8. It is installed on the outside of the workpiece together with the bow clip 3, and the installation position should be between two adjacent gaps. The function of the device is to realize the radial compression of the workpiece, prevent radial deformation during the cutting process, eliminate the manufacturing error of the workpiece radian, and ensure the reliable positioning and clamping of the workpiece. The device should be avoided during programming to avoid Interfering contact with the laser cutting head.

The asbestos plate 6 is a segmented arc-shaped member, and the radial width is slightly smaller than the groove width of the arc-shaped groove 41 of the arc-shaped positioning plate 4. It is installed in the arc-shaped groove of the adjacent positioning backing plate 5 with screws and nuts. In order to insulate and block laser damage to the device of the present invention, and prevent the thermal deformation of the device from affecting the positioning accuracy and cutting quality of the workpiece, an asbestos plate 6 needs to be installed under each notch and hole to be cut.

For parts without sag, the flexible positioning and clamping device is used to make the gap of large and medium-sized arc-shaped thin-walled parts as follows:

1. Use the workpiece notch detection template to draw the notch shape line of the first product;

2. Select the positioning pad 5 with the corresponding thickness according to the inner size of the part;

3. Place the workpiece on the arc-shaped positioning plate 4, and determine the installation position and quantity of the positioning pad 5 and the radial pressing device. The installation position of the positioning pad 5 and the radial pressing device should be in two adjacent gaps. For parts with an arc length of about 90 degrees, the number of backing plates should be 4 to 5 pairs, and the number of radial pressing devices should be 3 to 4;

4. Remove the part, install the positioning pad 5 in the arc-shaped groove 41 of the arc-shaped positioning plate 4, and insert the steel rod 8 of the radial pressing device into the through hole 43 under the arc-shaped groove of the arc-shaped positioning plate 4 Inside;

5. Install the asbestos plate 6 in the arc-shaped grooves 41 on both sides of the arc-shaped positioning plate 4;

6. Put the workpiece on the arc-shaped positioning plate 4, and take the radial pressing device to press the workpiece on the arc-shaped positioning plate 4;

7. Use the bow clamp 3 to clamp the thickness direction of the workpiece at the position of the positioning pad 5;

8. 3D modeling of parts; generate laser cutting program, coordinate conversion, find out whether there is any interference between the laser cutting head and the device and modify the laser cutting program; perform program positioning with the outline of the gap drawn in step 1, and record the coordinate points, Manually run the cutting program to find out whether the laser cutting head interferes with the invented device and modify the laser cutting program;

9. Return to the starting point of the laser cutting program, start the laser cutting program to complete the first piece processing, and return the laser cutting head to the origin of the absolute coordinates of the laser machine;

10. Pick up and check the correctness of the notch, and adjust the cutting procedure as needed;

11. Take the second piece and automatically complete the cutting and processing of subsequent products.

For the processing methods of workpieces with sag, the difference is:

Step 3 also includes: selecting the corresponding sagging positioning blocks 13 and the quantity according to the size of the sag of the workpiece, and installing the sagging positioning blocks 13 on both sides of the arc-shaped positioning plate 4 correspondingly; placing the workpiece on the arc-shaped positioning plate 4 , the product sag is aligned with the sag positioning block.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. It should be pointed out that any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall include within the protection scope of the present invention.

Claims (10)

1. A flexible positioning and clamping device for the manufacture of large and medium-sized curved thin-walled parts, characterized in that: the clamping device comprises a base, an arc-shaped positioning plate, an oblique support, a lateral fixing device and a radial fixing device ; The arc of the upper arc surface of the arc-shaped positioning plate is consistent with the arc of the arc-shaped thin-walled part, and the arc-shaped positioning plate is vertically fixed on the base through the inclined support; the lateral fixing device is used for the workpiece in the thickness direction. Positioning and clamping, the radial fixing device is used to fix the workpiece in the radial direction; the two sides of the arc-shaped positioning plate are provided with arc-shaped grooves, and several pairs of positioning are arranged at intervals in the arc-shaped grooves The backing plate is provided with an asbestos plate between the positioning backing plate and the arc groove. 2. The flexible positioning and clamping device for making the gaps of large and medium-sized arc-shaped thin-walled parts according to claim 1, characterized in that: in each group of said positioning pads, one side of the positioning pad is provided with a notch. The stepped hole is provided with a threaded hole on the opposite side, and a through hole is provided at the corresponding position of the arc-shaped positioning plate, and the positioning pads on both sides are fixed to the arc-shaped groove by bolts. There are different thickness specifications, which can be matched according to the different inner dimensions of the workpiece. 3. The flexible positioning and clamping device for making large and medium-sized arc-shaped thin-walled parts according to claim 2, characterized in that: each group of positioning pads is also provided with an arcuate clamp, which can The word-shaped part is pressed and fixed on the arc-shaped positioning plate; one end of the bow-shaped clip is provided with a widened plane, which can be closely attached to the outer surface of one side of the several-shaped part; the other end of the bow-shaped clip is provided with a clamping foot. The horizontal bolt holes are matched with wide-footed bolts, and the square-shaped parts are pressed from the other side by adjusting the wide-footed bolts. 4. The flexible positioning and clamping device for making large and medium-sized arc-shaped thin-walled parts according to claim 1, wherein the radial compression device comprises a support rod, a tension plate and a steel rod, When installing, pass the steel bar horizontally under the arc-shaped groove of the arc-shaped positioning plate, place the pressing pad on the figure-shaped workpiece, place the support rod on the pressing pad, and place the tension plate on the steel bar. and the support rod from both sides at the same time, and compress the parts from the radial direction. 5. The flexible positioning and clamping device for making the gaps of large and medium-sized arc-shaped thin-walled parts according to claim 4, characterized in that: the upper end of the tension plate is provided with a hanging hole, the lower end is provided with a hook, a support rod The two ends of the two tension plates are respectively sleeved into the hanging holes of the two tension plates, and the hooks at the lower ends of the two tension plates hook the ends of the steel bars to radially fix the parts. 6 . The flexible positioning and clamping device for making large and medium-sized arc-shaped thin-walled parts according to claim 5 , wherein the radial pressing device further comprises a pressing bolt, and the pressing The backing plate is placed between the support rod and the workpiece, the middle of the support rod is provided with a horizontal screw hole, and the pressing bolt is screwed down from the screw hole of the support rod against the pressing backing plate to achieve radial compression of the workpiece . 7 . The flexible positioning and clamping device for making large and medium-sized arc-shaped thin-walled parts according to claim 1 , wherein the inclined support is in the shape of a right-angled triangle, and the two right-angled sides thereof are provided with connection fixing devices. 8 . A skirt is used, and the connection and fixing skirt is fixedly connected with the base and the arc-shaped positioning plate by bolts; the base is provided with a positioning pin hole, which can be fixed on the machine tool table through the positioning pin. 8. The manufacturing method of using a flexible positioning and clamping device for the notch of large and medium-sized arc-shaped thin-walled parts, including the following steps: Step 1: Use the workpiece notch detection template to draw the notch shape line of the first product; select the positioning pad with the corresponding thickness according to the inner size of the workpiece; place the workpiece on the arc positioning plate to determine the positioning pad and radial The installation position and quantity of the pressing device, the installation position of the positioning pad and the radial pressing device should be between the two adjacent notches to be processed; Step 2: Remove the parts and install asbestos plates in the arc grooves on both sides of the arc positioning plate; then install the positioning pads in the arc grooves of the arc positioning plate; Step 3: Insert the steel rod of the radial pressing device into the through hole under the arc groove of the arc-shaped positioning plate; place the workpiece on the arc-shaped positioning plate again, and take the radial pressing device to compress the workpiece On the arc positioning plate; use the bow clamp to clamp the thickness direction of the workpiece at the position of the positioning pad; Step 4: 3D modeling of parts; generate laser cutting program, coordinate transformation, find out whether there is interference between the laser cutting head and the invented device, and modify the laser cutting program; Step 5: Position the program with the outline of the notch drawn in step 1, record the coordinate points, run the cutting program manually, check whether the laser cutting head interferes with the inventive device and modify the laser cutting program; Step 6: Return to the starting point of the laser cutting program, start the laser cutting program to complete the first piece processing, and return the laser cutting head to the absolute coordinate origin of the laser machine; remove the workpiece and check the correctness of the gap, and adjust the cutting as needed program; Step 7: Take the second piece and automatically complete the cutting and processing of subsequent products; 9. The manufacturing method of using a flexible positioning and clamping device for the notch of large and medium-sized arc-shaped thin-walled parts according to claim 8, characterized in that: when processing a part with sag, In step 1, it also includes the steps of selecting corresponding sag positioning blocks and quantities according to the size of the sag of the workpiece, and installing the sag positioning blocks at the corresponding positions before and after the arc-shaped positioning plate; and placing the workpiece on the arc-shaped positioning plate. , the product sag is aligned with the sag positioning block. 10. The manufacturing method of using a flexible positioning and clamping device for large and medium-sized arc-shaped thin-walled parts according to claim 9, characterized in that: for parts with an arc length of about 90 degrees, the number of backing plates is 4 ~5 pairs, the number of radial compression devices should be 3 to 4.

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