Processing clamp for liquid storage tank pipe products and processing method thereof

Abstract

The application discloses a kind of processing clamps of liquid storage tank pipe products and processing method thereof, belong to processing clamp technical field, including support big bottom plate;The upper end of the support big bottom plate is fixedly connected with four-axis rotary table and four-axis tailstock;Multiple groups of profiling support components, multiple groups of compression components and multiple groups of end positioning components are installed on the clamp bridge plate;The airtight detection hole that passes through up and down is formed in the profiling support component, when the movable end of end positioning component moves to the lowermost end, the movable end of end positioning component blocks airtight detection hole.By the above mode, the application realizes the traditional three sequence flow production, optimizes the finished product of one sequence processing by one equipment, greatly reduces the processing procedure, greatly saves the use of manpower, avoids the cumulative error of product scratch and size repeated positioning caused by multiple clamping and taking, and is beneficial to improve processing stability.

Description

Technical Field

[0001] This invention relates to the field of machining fixture technology, specifically to a machining fixture and machining method for liquid storage tank pipe products. Background Technology

[0002] Automotive air conditioning generates a significant amount of heat. To ensure driving comfort and maintain stable vehicle operation, the radiator assembly plays a crucial role, effectively dissipating heat and ensuring the air conditioning system operates within its designated temperature range. With increasing competition in the automotive industry, OEMs are pursuing modularity and lightweight designs to reduce vehicle design and manufacturing costs. Our company participated in the development of the coolant reservoir within the radiator assembly, which required a very compact space layout, lightweight construction, and high design standards.

[0003] The receiver-dryer is a crucial component of the compressor, serving functions such as storage, gas-liquid separation, filtration, noise reduction, and refrigerant buffering. It is installed in the air conditioner evaporator and compressor suction pipe, acting as a protective component to prevent liquid refrigerant from flowing into the compressor and causing liquid slugging. The material is typically produced from extruded aluminum alloy bars. During the welding assembly production of the receiver-dryer, the outer shape or inner bore of the receiver-dryer tubing is used as a positioning reference by welding or assembly tooling; therefore, the positional accuracy requirements for the machining features of the receiver-dryer tubing are relatively high.

[0004] The conventional machining method for tubular parts is a sequential machining process, which involves machining the inner contour on a lathe, machining the side holes on a drilling machine, and machining the stepped surfaces on a milling machine. Because of this sequential machining method, each step requires clamping and unloading. Multiple clamping and unloading operations increase the risk of scratches and dents on the product, as well as the cumulative error from repeated dimensional positioning, posing a significant challenge to the dimensional stability of the machined product.

[0005] Based on this, the present invention designs a processing fixture and processing method for liquid storage tank pipe products to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a processing fixture and processing method for liquid storage tank pipe products.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A machining fixture for liquid storage tank pipe products, including a supporting base plate;

[0009] A four-axis turntable is fixedly connected to the upper left side of the supporting base plate;

[0010] A four-axis tailstock is fixedly connected to the upper right side of the supporting base plate;

[0011] The rotation centers of the four-axis turntable and the four-axis tailstock are on the same straight line; the four-axis turntable and the four-axis tailstock are connected as a whole by a supporting base plate;

[0012] The left end of the clamping bridge plate is connected to the four-axis turntable via an L-shaped connecting plate, and the right end of the clamping bridge plate is connected to the four-axis tailstock via an L-shaped connecting plate.

[0013] The clamping bridge plate is equipped with multiple sets of contour support components for mounting workpieces, multiple sets of clamping components for clamping workpieces, and multiple sets of end positioning components that cooperate with the contour support components to position the workpiece at the end. The movable ends of the multiple sets of end positioning components are located on the front side of each contour support component and contact the front of the workpiece. The multiple sets of clamping components are located on the left side of each contour support component.

[0014] Each of the contour support components has an airtightness detection hole that runs vertically through it. When the movable end of the end positioning component moves to the lowest point, the movable end of the end positioning component blocks the airtightness detection hole.

[0015] Furthermore, a first pad is fixedly connected to the upper left side of the supporting base plate, and a four-axis turntable is fixedly connected to the top of the first pad; a second pad is fixedly connected to the upper right side of the supporting base plate, and a four-axis tailstock is fixedly connected to the top of the second pad.

[0016] Furthermore, L-shaped connecting plates are fixedly connected to the left and right ends of the clamping bridge plate, and the outer ends of the vertical plates of the two sets of L-shaped connecting plates are fixedly connected to the rotating ends of the four-axis turntable and the four-axis tailstock, respectively.

[0017] Furthermore, a pressure distributor is fixedly installed on the four-axis tailstock to connect the airtightness detection hole on the contour support assembly to an external pressure sensor to provide airtightness detection function.

[0018] Furthermore, the air pressure distributor has multiple sets of air path connectors fixedly connected inside. One end of each set of air path connectors is fixed and connected to each air tightness detection hole. The air pressure distributor is fixedly connected to the rotating end of the four-axis tailstock. The other end of each set of air path connectors is connected to an external air pressure sensor.

[0019] Furthermore, the contouring support assembly includes a contouring support base, a first clearance machining groove, a clearance groove, a contouring transverse insertion hole, a side straight groove, and a second clearance machining groove. The contouring support base is hollow inside, and its bottom is fixedly mounted on the fixture bridge plate. The top front end of the contouring support base has a first clearance machining groove for clearance during workpiece processing, and the top middle position of the contouring support base has a second clearance machining groove for clearance during workpiece processing. The interior of the contouring support base has a contouring transverse insertion hole running along the front-back direction, into which the workpiece is inserted. The left end of the contouring support base has a side straight groove that mates with the clamping assembly. The top rear end of the contouring support base has two clearance grooves.

[0020] Furthermore, the clamping assembly includes a first hydraulic cylinder, a straight hole, a horizontal shaft, a connecting block, a first contour clamping block, a second contour clamping block, a side plate, a tension spring, a movable groove, and a riveting shaft. The first hydraulic cylinder is fixedly installed at the bottom of the fixture bridge plate. The output end of the first hydraulic cylinder is hinged to the lower end of the connecting block and the lower end of the side plate via the riveting shaft. The lower end of the side plate has a movable groove for the riveting shaft to pass through and move. The first contour clamping block, which contacts the workpiece, is fixedly connected to the inner wall of the upper end of the connecting block. The middle part of the side plate and the middle part of the connecting block are hinged to the horizontal shaft. The two ends of the horizontal shaft are respectively fixedly installed on the inner wall of the contour support base, and the side plate and the connecting block are movably connected in the side straight groove. The second contour clamping block, which contacts the workpiece, is fixedly connected to the inner wall of the upper end of the side plate. The fixture bridge plate has several straight holes for the output ends of each first hydraulic cylinder to pass through. One end of the tension spring is fixedly connected to the outer wall of the upper end of the connecting block, and the other end of the tension spring is fixedly connected to the side plate.

[0021] Furthermore, the end positioning assembly includes a second hydraulic cylinder, a baffle, a straight plate, a straight slide groove, and an arc-shaped limiting block; the second hydraulic cylinder is fixedly installed at the bottom of the fixture bridge plate, the output end of the top of the second hydraulic cylinder is fixedly connected to the straight plate, the straight plate is slidably connected to the straight slide groove opened at the front end of the contour support, the top of the straight plate is fixedly connected to the arc-shaped limiting block, and the arc-shaped limiting block contacts the end face of the workpiece when it moves to the highest point; the front end of the contour support is fixedly connected to a baffle for blocking the front opening of the straight slide groove.

[0022] Furthermore, a hydraulic circuit distributor for providing power to the first and second cylinders is fixedly installed on the four-axis turntable.

[0023] A method for processing liquid storage tank tubing products includes the following steps:

[0024] 1. Install the workpiece on the machining fixture for liquid storage tank pipe products: Move the side plate and connecting block upward to install the workpiece in the cavity of the contoured horizontal insertion hole. Then release the side plate and connecting block. Under the elastic force of the tension spring, the tension spring drives the right end of the side plate to move upward, so that the riveting shaft and the movable groove slide relative to each other. The left end of the side plate moves downward. When the workpiece is placed into the cavity of the contoured horizontal insertion hole, the pre-positioning function can be achieved through the second contouring clamping block, so that the positioning reference surface of the workpiece and the positioning surface of the cavity of the contoured horizontal insertion hole are pre-fitted.

[0025] 2. When the second hydraulic cylinder is activated, it moves the straight plate and the arc-shaped limiting block upward. The arc-shaped limiting block contacts the end face of the workpiece, which serves to position the workpiece. When the first hydraulic cylinder is activated, it moves the riveting axis upward. Since the position of the horizontal axis remains unchanged, the connecting block rotates counterclockwise along the horizontal axis. The connecting block drives the first contour pressing block to contact the workpiece and press the workpiece. Then, the pressing surface of the first contour pressing block and the workpiece are in contact to press the workpiece.

[0026] 3. Start the four-axis rotary table and four-axis tailstock to rotate the workpiece 0°, and machine the step and two side holes on the 0° surface;

[0027] 4. Start the four-axis rotary table and four-axis tailstock to rotate the workpiece 90° and process the 90° plane and inner contour forming hole;

[0028] 5. Start the second hydraulic cylinder to drive the straight plate and the arc-shaped limit block to move down and retract to make room. When the arc-shaped limit block moves down to the bottom, it blocks the air tightness detection hole, and the air tightness detection hole is in a closed state. When the air tightness detection hole is in a closed state, the air pressure distributor does not flow. At this time, it is detected by the external air pressure sensor, and then the external machine tool processing equipment is controlled to run to perform front positioning surface processing.

[0029] 6. Start the four-axis rotary table and four-axis tailstock to rotate the workpiece by -90° and machine the -90° boss surface and inner contour forming hole;

[0030] 7. Start the four-axis rotary table and four-axis tailstock to rotate the workpiece 0°, process the two side holes on the 0° surface, and deburr the flanges generated on the inner contour intersection surface; save the time of workers manually scraping burrs after the product is taken out, which helps to ensure the processing quality of the product. Beneficial effects

[0031] This invention optimizes the traditional three-stage production process into a single-stage process using a single machine, greatly reducing the number of processing steps, significantly saving manpower, avoiding product scratches caused by repeated clamping and unloading, and preventing cumulative errors from repeated dimensional positioning, thus improving processing stability. Furthermore, due to the concentration of processes, it also reduces the floor space cost of multi-stage equipment and the cost of operator configuration.

[0032] This invention, by adding an airtightness detection hole and an air pressure distributor, enables air pressure detection to determine whether the arc-shaped limit block has retracted to the predetermined position. This facilitates the control of external machine tool processing equipment for front positioning surface processing, avoiding the need for operators to open the operating door and manually check whether the end positioning component has retracted to the predetermined position. This significantly improves the utilization efficiency of the machine tool and saves manual operation time. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This invention provides a three-dimensional machining fixture structure for liquid storage tank pipe products. Figure 1 ;

[0035] Figure 2 This is a front view of a machining fixture structure for liquid storage tank pipe products according to the present invention;

[0036] Figure 3 This invention provides a three-dimensional machining fixture structure for liquid storage tank pipe products. Figure 2 ;

[0037] Figure 4 This invention provides a three-dimensional machining fixture structure for liquid storage tank pipe products. Figure 3 ;

[0038] Figure 5 This invention provides a three-dimensional machining fixture structure for liquid storage tank pipe products. Figure 4 ;

[0039] Figure 6 The three-dimensional shape of the clamping component in this invention Figure 1 ;

[0040] Figure 7 The three-dimensional shape of the clamping component in this invention Figure 2 ;

[0041] Figure 8 The three-dimensional shape of the clamping component in this invention Figure 3 ;

[0042] Figure 9 The three-dimensional form of the contour support component in this invention Figure 1 ;

[0043] Figure 10 The three-dimensional form of the contour support component in this invention Figure 2 ;

[0044] Figure 11 The three-dimensional form of the contour support component in this invention Figure 3 ;

[0045] Figure 12 The three-dimensional form of the contour support component in this invention Figure 4 .

[0046] The labels in the diagram represent:

[0047] 1. Support base plate; 2. First pad plate; 3. Fixture bridge plate; 4. Four-axis rotary table; 5. Hydraulic oil circuit distributor; 6. L-shaped connecting plate; 7. Clamping assembly; 71. First oil cylinder; 72. Straight hole; 73. Horizontal shaft; 74. Connecting block; 75. First contour clamping block; 76. Second contour clamping block; 77. Side plate; 78. Tension spring; 79. Movable groove; 710. Riveting shaft; 8. End positioning assembly; 81. Second hydraulic cylinder; 82. Baffle; 83. Straight plate; 84. Straight slide groove; 85. Arc-shaped limit block; 86. Air tightness test hole; 9. Second pad; 10. Four-axis tailstock; 11. Air pressure distributor; 12. Contouring support assembly; 121. Contouring support base; 122. First clearance machining groove; 123. Clearance groove; 124. Contouring horizontal insertion hole; 125. Side straight groove; 126. Second clearance machining groove. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0049] The present invention will be further described below with reference to embodiments.

[0050] In some embodiments, please refer to the appendix to the instruction manual. Figure 1-12 A processing fixture for liquid storage tank pipe products, including a supporting base plate 1;

[0051] A four-axis turntable 4 is fixedly connected to the upper left side of the supporting base plate 1;

[0052] Preferably, a first pad 2 is fixedly connected to the upper left side of the supporting base plate 1, and a four-axis turntable 4 is fixedly connected to the top of the first pad 2.

[0053] A four-axis tailstock 10 is fixedly connected to the upper right side of the supporting base plate 1;

[0054] Preferably, a second pad 9 is fixedly connected to the upper right side of the supporting base plate 1, and a four-axis tailstock 10 is fixedly connected to the top of the second pad 9.

[0055] The rotation centers of the four-axis turntable 4 and the four-axis tailstock 10 are on the same straight line; the four-axis turntable 4 and the four-axis tailstock 10 are connected into a whole by the supporting base plate 1;

[0056] The left end of the clamping bridge plate 3 is connected to the four-axis turntable 4 via the L-shaped connecting plate 6, and the right end of the clamping bridge plate 3 is connected to the four-axis tailstock 10 via the L-shaped connecting plate 6.

[0057] Preferably, L-shaped connecting plates 6 are symmetrically fixedly connected to the left and right ends of the clamping bridge plate 3, and the outer ends of the vertical plates of the two sets of L-shaped connecting plates 6 are fixedly connected to the rotating ends of the four-axis turntable 4 and the four-axis tailstock 10, respectively.

[0058] The clamping bridge plate 3 is equipped with multiple sets of contour support assemblies 12 for mounting workpieces, multiple sets of clamping assemblies 7 for clamping workpieces, and multiple sets of end positioning assemblies 8 that cooperate with the contour support assemblies 12 to position the end of the workpiece; the movable ends of the multiple sets of end positioning assemblies 8 are located on the front side of each contour support assembly 12 and contact the front of the workpiece; the multiple sets of clamping assemblies 7 are located on the left side of each contour support assembly 12.

[0059] Each contour support component 12 is provided with an airtightness detection hole 86 that runs vertically through it. When the movable end of the end positioning component 8 moves to the lowest point, the movable end of the end positioning component 8 blocks the airtightness detection hole 86.

[0060] The L-shaped connecting plate 6 is rotated by the four-axis rotary table 4 and the four-axis tailstock 10. The L-shaped connecting plate 6 drives the fixture bridge plate 3 to rotate. The fixture bridge plate 3 drives the contour support assembly 12, the clamping assembly 7, and the end positioning assembly 8 to rotate. The workpiece is installed in the contour support assembly 12 and clamped by the clamping assembly 7. The end positioning assembly 8 provides lateral positioning and axial support force for the workpiece. When the front positioning surface needs to be machined, the end positioning assembly 8 is activated to move down and retract to avoid interference with the machining. In order to detect whether the end positioning assembly 8 has retracted to the predetermined position, an airtightness detection hole 86 is added. When the end positioning assembly 8 retracts to the predetermined position, the movable end of the end positioning assembly 8 blocks the airtightness detection hole 86, and the airtightness detection hole 86 is in a closed state.

[0061] Preferably, a pressure distributor 11 is fixedly installed on the four-axis tailstock 10 to connect the air tightness detection hole 86 on the contour support assembly 12 to an external pressure sensor to provide air tightness detection function;

[0062] Preferably, the air pressure distributor 11 has multiple sets of air passage connectors fixedly connected inside. One end of each set of air passage connectors is fixed and connected to each air tightness detection hole 86. The air pressure distributor 11 is fixedly connected to the rotating end of the four-axis tailstock 10. The other end of each set of air passage connectors is connected to an external air pressure sensor.

[0063] In this way, when the airtightness detection hole 86 is in a closed state, it can be detected by an external air pressure sensor. At this time, the operation of the external machine tool processing equipment can be controlled to process the front positioning surface. This avoids the need for operators to open the operation door and manually check whether the end positioning component 8 has returned to the predetermined position, which greatly improves the utilization efficiency of the machine tool and saves manual operation time.

[0064] Preferably, the contouring support assembly 12 includes a contouring support base 121, a first clearance machining groove 122, a clearance groove 123, a contouring transverse insertion hole 124, a side straight groove 125, and a second clearance machining groove 126. The contouring support base 121 is hollow inside, and its bottom is fixedly mounted on the fixture bridge plate 3. The top front end of the contouring support base 121 has a first clearance machining groove 122 for clearance when processing the workpiece, and the top middle position of the contouring support base 121 has a second clearance machining groove 126 for clearance when processing the workpiece. The interior of the contouring support base 121 has a contouring transverse insertion hole 124 along the front-rear direction, and the workpiece is inserted into the contouring transverse insertion hole 124. The left end of the contouring support base 121 has a side straight groove 125 that cooperates with the clamping assembly. The top rear end of the contouring support base 121 has two clearance grooves 123.

[0065] The contour support component 12 is used for the external positioning of tubular products and bears the downward cutting force when machining the upper surface. The workpiece is placed through the contour transverse insertion hole 124, the cutting space of the front end face is cleared through the first clearance machining groove 122, the cutting space of the upper end face is cleared through the second clearance machining groove 126, and the cutting space of the rear end face is cleared through the retraction movement of the end positioning component 8.

[0066] The clamping assembly 7 includes a first hydraulic cylinder 71, a straight hole 72, a horizontal shaft 73, a connecting block 74, a first contour clamping block 75, a second contour clamping block 76, a side plate 77, a tension spring 78, a movable groove 79, and a riveting shaft 710. The first hydraulic cylinder 71 is fixedly installed at the bottom of the fixture bridge plate 3. The output end of the top of the first hydraulic cylinder 71 is hinged to the lower end of the connecting block 74 and the lower end of the side plate 77 via the riveting shaft 710. The lower end of the side plate 77 has a movable groove 79 for the riveting shaft 710 to pass through and move. The upper inner wall of the connecting block 74 is fixedly connected to the first hydraulic cylinder 75, which is in contact with the workpiece. A contour clamping block 75 is hinged at the middle of the side plate 77 and the middle of the connecting block 74 via a horizontal shaft 73. The two ends of the horizontal shaft 73 are respectively fixedly installed on the inner wall of the contour support 121, and the side plate 77 and the connecting block 74 are movably connected in the side straight groove 125. A second contour clamping block 76 that contacts the workpiece is fixedly connected to the upper inner wall of the side plate 77. The fixture bridge plate 3 is provided with several straight holes 72 that cooperate with the output ends of each first oil cylinder 71 to pass through. One end of the tension spring 78 is fixedly connected to the upper outer wall of the connecting block 74, and the other end of the tension spring 78 is fixedly connected to the side plate 77.

[0067] Using the elastic force of the tension spring 78, the tension spring 78 drives the right end of the side plate 77 to move upward, so that the riveting shaft 710 and the movable groove 79 slide relative to each other, and the left end of the side plate 77 moves downward. When the workpiece is placed into the cavity of the contoured horizontal insertion hole 124, the second contoured clamping block 76 can achieve the pre-positioning function, so that the positioning reference surface of the workpiece and the positioning surface of the cavity of the contoured horizontal insertion hole 124 are pre-fitted. Then, the first contoured clamping block 75 and the clamping surface of the workpiece are fitted together to clamp the workpiece, which is beneficial to the lower part of the workpiece being pressed and fitted with the contoured horizontal insertion hole 124.

[0068] When the first hydraulic cylinder 71 is started and drives the riveting shaft 710 to move upward, since the position of the horizontal shaft 73 remains unchanged, the connecting block 74 rotates counterclockwise along the horizontal shaft 73. The connecting block 74 drives the first contouring clamping block 75 to contact the workpiece and clamp the workpiece.

[0069] The end positioning assembly 8 includes a second hydraulic cylinder 81, a baffle 82, a straight plate 83, a straight slide groove 84, and an arc-shaped limiting block 85. The second hydraulic cylinder 81 is fixedly installed at the bottom of the fixture bridge plate 3. The output end of the second hydraulic cylinder 81 is fixedly connected to the straight plate 83. The straight plate 83 is slidably connected to the straight slide groove 84 opened at the front end of the contour support 121. An arc-shaped limiting block 85 is fixedly connected to the top of the straight plate 83. When the arc-shaped limiting block 85 moves to the highest point, it contacts the end face of the workpiece. A baffle 82 for blocking the front opening of the straight slide groove 84 is fixedly connected to the front end of the contour support 121. When the arc-shaped limiting block 85 moves to the bottom, it blocks the airtightness detection hole 86.

[0070] When the front positioning surface needs to be machined, the second hydraulic cylinder 81 is activated to drive the straight plate 83 and the arc-shaped limit block 85 to move down and retract to avoid interference with the machining. When the arc-shaped limit block 85 moves down to the bottom, it blocks the airtightness detection hole 86, and the airtightness detection hole 86 is in a closed state. When the airtightness detection hole 86 is in a closed state, the air pressure distributor 11 is not flowing. At this time, it can be detected by the external air pressure sensor. At this time, the operation of the external machine tool can be controlled to perform the machining of the front positioning surface. This avoids the need for the operator to open the operating door and manually check whether the end positioning component 8 has retracted to the predetermined position, which greatly improves the utilization efficiency of the machine tool and saves manual operation time.

[0071] Preferably, a hydraulic circuit distributor 5 is fixedly installed on the four-axis rotary table 4 to distribute hydraulic circuits to the fixture bridge plate 3 and provide power to the first cylinder 71 and the second cylinder 81;

[0072] This invention optimizes the traditional three-stage production process into a single-stage process using a single machine, greatly reducing the number of processing steps, significantly saving manpower, avoiding product scratches caused by repeated clamping and unloading, and preventing cumulative errors from repeated dimensional positioning, thus improving processing stability. Furthermore, due to the concentration of processes, it also reduces the floor space cost of multi-stage equipment and the cost of operator configuration.

[0073] By adding an airtightness detection hole 86 and an air pressure distributor 11, this invention enables air pressure detection to determine whether the arc-shaped limit block 85 has retracted to the predetermined position. This facilitates the control of external machine tool processing equipment for front-side positioning surface processing, avoiding the need for operators to open the operating door and manually check whether the end positioning component 8 has retracted to the predetermined position. This significantly improves the utilization efficiency of the machine tool and saves manual operation time.

[0074] In some embodiments, please refer to the appendix to the instruction manual. Figure 1-12 A method for processing liquid storage tank pipe products includes the following steps:

[0075] 1. Move the side plate 77 and connecting block 74 upward to install the workpiece in the cavity of the contoured transverse insertion hole 124. Then, release the side plate 77 and connecting block 74. Under the elastic force of the tension spring 78, the tension spring 78 drives the right end of the side plate 77 to move upward, so that the riveting shaft 710 and the movable groove 79 slide relative to each other. The left end of the side plate 77 moves downward. When the workpiece is placed into the cavity of the contoured transverse insertion hole 124, the pre-positioning function can be achieved through the second contoured clamping block 76, so that the positioning reference surface of the workpiece and the positioning surface of the cavity of the contoured transverse insertion hole 124 are pre-fitted.

[0076] Second, when the second hydraulic cylinder 81 is activated, it drives the straight plate 83 and the arc-shaped limiting block 85 to move upward. The arc-shaped limiting block 85 contacts the end face of the workpiece, which plays the role of positioning the workpiece. When the first hydraulic cylinder 71 is activated, it drives the riveting shaft 710 to move upward. Since the position of the horizontal shaft 73 remains unchanged, the connecting block 74 rotates counterclockwise along the horizontal shaft 73. The connecting block 74 drives the first contour pressing block 75 to contact the workpiece and press the workpiece. Then, the pressing surface of the first contour pressing block 75 and the workpiece are in contact to press the workpiece.

[0077] 3. Start the four-axis rotary table 4 and the four-axis tailstock 10 to rotate the workpiece by 0° and machine the step and two side holes on the 0° surface;

[0078] IV. Start the four-axis rotary table 4 and the four-axis tailstock 10 to rotate the workpiece 90° and process the 90° plane and the inner contour forming hole;

[0079] 5. Start the second oil cylinder 81 to drive the straight plate 83 and the arc-shaped limit block 85 to move down and retract to make room. When the arc-shaped limit block 85 moves down to the bottom, it blocks the air tightness detection hole 86, and the air tightness detection hole 86 is in a closed state. When the air tightness detection hole 86 is in a closed state, the air pressure distributor 11 is not flowing. At this time, it is detected by the external air pressure sensor, and then the external machine tool processing equipment is controlled to run to perform front positioning surface processing.

[0080] 6. Start the four-axis rotary table 4 and the four-axis tailstock 10 to rotate the workpiece by -90° and machine the -90° boss surface and the inner contour forming hole;

[0081] 7. Start the four-axis rotary table 4 and the four-axis tailstock 10 to rotate the workpiece 0°, process the two side holes on the 0° surface, and deburr the flanges generated on the inner contour intersection surface; save the time of workers manually scraping burrs after the product is taken out, which helps to ensure the processing quality of the product.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A machining fixture for liquid storage tank pipe products, comprising a supporting base plate (1), characterized in that: A four-axis turntable (4) is fixedly connected to the upper left side of the supporting base plate (1). The upper right side of the supporting base plate (1) is fixedly connected to a four-axis tailstock (10). The left end of the clamp bridge plate (3) is connected to the four-axis turntable (4) through the L-shaped connecting plate (6), and the right end of the clamp bridge plate (3) is connected to the four-axis tailstock (10) through the L-shaped connecting plate (6). The clamping bridge plate (3) is equipped with multiple sets of contour support components (12) for mounting workpieces, multiple sets of clamping components (7) for clamping workpieces, and multiple sets of end positioning components (8) that cooperate with the contour support components (12) to position the workpiece at the end; the movable ends of the multiple sets of end positioning components (8) are located on the front side of each contour support component (12) and in contact with the front of the workpiece; the multiple sets of clamping components (7) are located on the left side of each contour support component (12); Each of the contour support components (12) is provided with an airtightness detection hole (86) that runs vertically through it. When the movable end of the end positioning component (8) moves to the lowest end, the movable end of the end positioning component (8) blocks the airtightness detection hole (86). The contouring support assembly (12) includes a contouring support base (121), a first clearance machining groove (122), a clearance groove (123), a contouring transverse insertion hole (124), a side straight groove (125), and a second clearance machining groove (126). The contouring support base (121) is hollow inside, and the bottom of the contouring support base (121) is fixedly installed on the fixture bridge plate (3). The top front end of the contouring support base (121) is provided with a first clearance machining groove (126) for clearance when processing the workpiece. 2) A second clearance machining groove (126) is provided at the middle of the top of the contour support base (121) to allow room for the workpiece during processing. A contour transverse insertion hole (124) is provided inside the contour support base (121) along the front-back direction. The workpiece is inserted into the contour transverse insertion hole (124). A side straight groove (125) is provided at the left end of the contour support base (121) to cooperate with the clamping assembly. Two clearance grooves (123) are provided at the rear end of the top of the contour support base (121). The clamping assembly (7) includes a first hydraulic cylinder (71), a straight hole (72), a horizontal shaft (73), a connecting block (74), a first contour clamping block (75), a second contour clamping block (76), a side plate (77), a tension spring (78), a movable groove (79), and a riveting shaft (710). The first hydraulic cylinder (71) is fixedly installed at the bottom of the clamping bridge plate (3). The output end of the top of the first hydraulic cylinder (71) is hinged to the lower end of the connecting block (74) and the lower end of the side plate (77) through the riveting shaft (710). The lower end of the side plate (77) is provided with a movable groove (79) through which the riveting shaft (710) passes and moves. The upper inner wall of the connecting block (74) is fixedly connected with a contacting part of the workpiece. The first contour clamping block (75) is connected, the middle part of the side plate (77) and the middle part of the connecting block (74) are hinged by the horizontal shaft (73), the two ends of the horizontal shaft (73) are respectively fixedly installed on the inner wall of the contour support base (121), and the side plate (77) and the connecting block (74) are movably connected in the side straight groove (125); the upper inner wall of the side plate (77) is fixedly connected to the second contour clamping block (76) that contacts the workpiece, and the clamping bridge plate (3) is provided with several straight holes (72) that cooperate with the output end of each first oil cylinder (71) to pass through; one end of the tension spring (78) is fixedly connected to the upper outer wall of the connecting block (74), and the other end of the tension spring (78) is fixedly connected to the side plate (77); The end positioning assembly (8) includes a second hydraulic cylinder (81), a baffle (82), a straight plate (83), a straight slide groove (84), and an arc-shaped limiting block (85). The second hydraulic cylinder (81) is fixedly installed at the bottom of the clamp bridge plate (3). The output end of the top of the second hydraulic cylinder (81) is fixedly connected to the straight plate (83). The straight plate (83) is slidably connected to the straight slide groove (84) opened at the front end of the contour support base (121). An arc-shaped limiting block (85) is fixedly connected to the top of the straight plate (83). When the arc-shaped limiting block (85) moves to the highest point, it contacts the end face of the workpiece. A baffle (82) for blocking the front opening of the straight slide groove (84) is fixedly connected to the front end of the contour support base (121).

2. The machining fixture for liquid storage tank pipe products according to claim 1, characterized in that, The upper left side of the supporting base plate (1) is fixedly connected to a first pad (2), and the top of the first pad (2) is fixedly connected to a four-axis turntable (4); the upper right side of the supporting base plate (1) is fixedly connected to a second pad (9), and the top of the second pad (9) is fixedly connected to a four-axis tailstock (10).

3. The machining fixture for liquid storage tank pipe products according to claim 2, characterized in that, The left and right ends of the clamp bridge plate (3) are respectively fixedly connected to L-shaped connecting plates (6), and the outer ends of the vertical plates of the two sets of L-shaped connecting plates (6) are respectively fixedly connected to the rotating ends of the four-axis turntable (4) and the four-axis tailstock (10).

4. The machining fixture for liquid storage tank pipe products according to claim 3, characterized in that, A pressure distributor (11) is fixedly installed on the four-axis tailstock (10) to connect the air tightness detection hole (86) on the contour support assembly (12) to an external pressure sensor to provide air tightness detection function.

5. The machining fixture for liquid storage tank pipe products according to claim 4, characterized in that, The air pressure distributor (11) has multiple sets of air path connectors fixedly connected inside. One end of each set of air path connectors is fixed and connected to each air tightness detection hole (86). The air pressure distributor (11) is fixedly connected to the rotating end of the four-axis tailstock (10). The other end of each set of air path connectors is connected to an external air pressure sensor.

6. The machining fixture for liquid storage tank pipe products according to claim 5, characterized in that, A hydraulic circuit distributor (5) for providing power to the first cylinder (71) and the second cylinder (81) is fixedly installed on the four-axis turntable (4).

7. A processing method for liquid storage tank tubing products, characterized in that, Includes the following steps:

1. Install the workpiece on the processing fixture of the liquid storage tank pipe product as described in claim 6: Move the side plate (77) and the connecting block (74) upward to install the workpiece in the cavity of the contoured transverse insertion hole (124). Then release the side plate (77) and the connecting block (74). Under the elastic force of the tension spring (78), the tension spring (78) drives the right end of the side plate (77) to move upward, so that the riveting shaft (710) and the movable groove (79) slide relative to each other. The left end of the side plate (77) moves downward. When the workpiece is placed into the cavity of the contoured transverse insertion hole (124), the pre-positioning function can be achieved by the second contoured clamping block (76) so that the positioning reference surface of the workpiece and the positioning surface of the cavity of the contoured transverse insertion hole (124) are pre-fitted.

2. When the second oil cylinder (81) is started, the straight plate (83) and the arc-shaped limiting block (85) are moved upward. The arc-shaped limiting block (85) contacts the end face of the workpiece and plays the role of positioning the workpiece. When the first oil cylinder (71) is started, the riveting shaft (710) is moved upward. Since the position of the horizontal shaft (73) remains unchanged, the connecting block (74) rotates counterclockwise along the horizontal shaft (73). The connecting block (74) drives the first contour pressing block (75) to contact the workpiece and press the workpiece. Then, the pressing surface of the first contour pressing block (75) and the workpiece are pressed together to achieve the pressing of the workpiece.

3. Start the four-axis rotary table (4) and the four-axis tailstock (10) to rotate the workpiece by 0° and process the step and two side holes on the 0° surface; 4. Start the four-axis rotary table (4) and the four-axis tailstock (10) to drive the workpiece to rotate 90° and process the 90° plane and inner contour forming hole; 5. Start the second oil cylinder (81) to drive the straight plate (83) and the arc-shaped limit block (85) to move down and back to make room. When the arc-shaped limit block (85) moves down to the bottom, it blocks the air tightness detection hole (86) and the air tightness detection hole (86) is in a closed state. When the air tightness detection hole (86) is in a closed state, the air pressure distributor (11) does not flow. At this time, it is known through the external air pressure sensor. Then, the external machine tool processing equipment is controlled to run and the front positioning surface is processed.

6. Start the four-axis rotary table (4) and the four-axis tailstock (10) to rotate the workpiece by -90° and process the -90° boss surface and inner contour forming hole; 7. Start the four-axis rotary table (4) and the four-axis tailstock (10) to rotate the workpiece by 0°, process the two side holes on the 0° surface, and deburr the flanges generated on the inner contour intersection surface.

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