Quick exchange clamping device for CNC (computer numerical control) machining of square-head three-way screws

Abstract

The utility model discloses a square-head three-way screw CNC machining rapid interchange clamping device which comprises an interchange clamp used for fixing a square-head three-way screw and a clamping mechanism used for fixing the interchange clamp. The clamping mechanism comprises a base, fixing mechanisms arranged at the two ends of the base, a plurality of supporting blocks arranged on the base and a supporting plate fixed to the upper portions of the supporting blocks. The fixing mechanism comprises air cylinders, pressing claws and connecting rods, the air cylinders are fixed to the two sides of the base respectively, and the end portions of the output ends of the air cylinders are hinged to the rear ends of the pressing claws; the other end of the connecting rod is hinged to the side, close to the supporting plate, of the upper end face of the air cylinder. The interchanging clamp comprises an interchanging plate used for fixing the square-head three-way screw and a pressing block detachably fixed to the upper portion of the interchanging plate. The clamping device has the advantages of being high in clamping speed, accurate in positioning, low in manual occupancy rate of a numerical control machine tool and the like, and has wide market prospects and good economic value.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a CNC processing quick-interchange clamping device for square head three-way screws. Background Art

[0002] Computer digital control, referred to as CNC. It is a method of controlling the movement and processing of machine tools using digital information. Machine tools that use CNC technology to implement processing control, or machine tools equipped with CNC systems are called CNC machine tools. CNC systems include: CNC devices, programmable controllers, spindle drivers, and feed devices. CNC machine tools are highly integrated products of machinery, electricity, fluid, gas, and light. To achieve the control of machine tools, it is necessary to use geometric information to describe the relative movement between the tool and the workpiece, and to use process information to describe some process parameters that must be possessed by machine tool processing. This information is formed into a processing file (that is, the CNC processing program in normal terms) in a certain format and stored on an information carrier (such as a disk, punched paper tape, magnetic tape, etc.), and then read by the CNC system on the machine tool (or directly input through the keyboard of the CNC system, or input through communication), and decoded to enable the machine tool to move and process parts. Modern CNC machine tools are typical products of mechatronics and are the technical basis for a new generation of production technology, computer integrated manufacturing systems, etc.

[0003] When processing square head three-way screws, existing CNC machine tools use a clamp with an upper opening to fix the square head three-way screws. During operation, the operator first fixes the clamp on the workbench of the CNC machine tool; then places the square head three-way screws one by one on the square head three-way screw fixing positions prefabricated by the clamp, and then adjusts the position of the square head three-way screws and fixes them. After fixing, the square head three-way screws are processed by the milling cutter of the CNC machine tool. Among them, the operation of placing the square head three-way screws one by one on the square head three-way screw fixing positions prefabricated by the clamp, and then adjusting the position of the square head three-way screws and fixing them is referred to as clamping. In the actual operation process, it was found that the existing CNC machine tool processing square head three-way screw method has the following problems, as follows: 1. The operator first needs to place the square head three-way screw on the fixture, and then fix it in position. After the square head three-way screw is processed, it needs to be taken out and the square head three-way screw is placed again. In this process, there are situations such as the long placement time of the square head three-way screw and the long waiting time of the CNC machine tool, which increases the idle time of the CNC machine tool, resulting in an increase in the labor occupancy rate during the CNC machine tool processing process, making the use efficiency of the CNC machine tool low, thereby affecting the production and processing efficiency of the square head three-way screw. 2. Since manual adjustment, positioning and fixing are required during placement, the operator's proficiency and skills are required to be high, otherwise it is easy to cause inaccurate positioning or deviation in the placement position, affecting the processing quality of the product. 3. The fixture is processed in a semi-closed manner, which makes it easy for the square head three-way screw to be offset or detached during the processing process, resulting in a high defective rate of square head three-way screw processing and increased production costs.

[0004] Therefore, research and development are carried out to address the problems existing in the existing processing of square head tee screws, improve the clamping efficiency of the square head tee screws to be processed, reduce the clamping time for replacing the square head tee screws to be processed, and improve the processing efficiency of the square head tee screws, which have become urgent issues to be solved by square head tee screw production and processing companies. Summary of the invention

[0005] The utility model provides a square head three-way screw CNC processing quick interchange clamping device which can quickly and accurately install and fix the square head three-way screw on the clamp, and the manpower occupation rate of the CNC machine tool is low, the processing accuracy of the square head three-way screw is good and the quality is high. The utility model solves the problem that when the CNC machine tool processes the square head three-way screw, the clamping time of the square head three-way screw to be processed is long and the positioning is inaccurate, which leads to low utilization efficiency of the CNC machine tool, improves the production efficiency of the product, reduces the time cost of product production, and improves the quality of the product.

[0006] The utility model provides a quick interchange clamping device for CNC machining of square head three-way screws, comprising an interchange clamp for fixing the square head three-way screw and a clamping mechanism for quickly fixing the interchange clamp; the clamping mechanism comprises a base, a fixing mechanism arranged at both ends of the base, a plurality of support blocks arranged on the upper end surface of the base and located between the two fixing mechanisms, and a support plate fixed to the upper end surface of the support block; the fixing mechanism comprises a cylinder arranged on the base, a pressure claw for fixing the interchange clamp on the support plate, and a connecting rod arranged between the cylinder and the pressure claw; the cylinder is respectively fixed at both ends of the base, and the output end of the cylinder is hingedly connected to the rear end of the pressure claw; one end of the connecting rod is hingedly connected to the middle part of the pressure claw, and the other end is hingedly connected to the side of the upper end surface of the cylinder close to the support plate; the upper end of the support plate The surface is provided with multiple locating pins for positioning and fixing the interchangeable fixture, and the interchangeable fixture includes an interchangeable plate for fixing the square head three-way screw to be processed and a pressure block detachably fixed on the top of the interchangeable plate; the bottom of the interchangeable plate is provided with a first locating hole corresponding to the position of the locating pin, and the first locating hole matches the shape and size of the locating pin; the interchangeable fixture utilizes the first locating hole on the interchangeable plate to interact with the locating pin on the support plate to accurately fix it on the upper end surface of the support plate, and then utilizes the front end of the pressure claw in the fixing mechanism to press the interchangeable plate; the number of the pressure blocks is two, and the two pressure blocks are respectively fixed on the upper end surfaces on the left and right sides of the interchangeable plate along the length direction of the interchangeable plate, and the square head three-way screw to be processed is respectively fixed on the left and right sides of the interchangeable plate by utilizing the interaction between the interchangeable plate and the pressure blocks.

[0007] Preferably, the upper end surface of the support plate is also provided with a plurality of protrusions for supporting the interchangeable plates, and the upper end surfaces of the protrusions are on the same horizontal plane; the interchangeable plates are fixed on the support plate and under the action of the protrusions, a gap is formed between the lower end surface of the interchangeable plates and the upper end surface of the support plate.

[0008] Preferably, the position of the protrusion corresponds to the position of the support block.

[0009] Preferably, the interchangeable plate is also provided with a strip groove sunken downward from the upper end surface of the interchangeable plate, a plurality of first workpiece fixing grooves for fixing the square head three-way screws to be processed, a plurality of pressure block fixing holes for fixing the pressure block, and a plurality of pressure block positioning columns for positioning and fixing the pressure block; the strip groove is arranged on the left and right side walls of the interchangeable plate along the length direction of the interchangeable plate, and is located in the middle of the length direction of the interchangeable plate; the first workpiece fixing groove and the pressure block fixing hole are both arranged on the left and right sides of the interchangeable plate, and the first workpiece fixing groove and the pressure block fixing hole are arranged crosswise; the first workpiece fixing groove and the pressure block fixing hole on the same side of the interchangeable plate are on the same straight line, and are located on the inner side of the strip groove; the first workpiece fixing groove is connected to the strip groove; the pressure block positioning columns are respectively arranged at both ends of the straight line where the first workpiece fixing groove and the pressure block fixing hole are located.

[0010] Preferably, the pressing block is provided with a second workpiece fixing groove for fixing the square head three-way screw to be processed, a pressing block through hole connecting the upper and lower surfaces of the pressing block, and a pressing block positioning hole for positioning and fixing the pressing block.

[0011] Preferably, the pressing block positioning holes are respectively arranged at two ends of the pressing block, and the positions thereof correspond to the positions of the pressing block positioning columns.

[0012] Preferably, the position of the second workpiece fixing groove corresponds to the position of the first workpiece fixing groove arranged on the same side of the interchangeable plate; the position of the pressure block through hole corresponds to the position of the pressure block fixing hole arranged on the same side of the interchangeable plate.

[0013] Preferably, the first workpiece fixing groove is provided with a first tool avoidance hole whose position corresponds to the screw hole position of the square head three-way screw to be processed; the second workpiece fixing groove is provided with a second tool avoidance hole which connects the upper and lower end surfaces of the pressure block and whose position corresponds to the screw hole position of the square head three-way screw to be processed.

[0014] Preferably, the shape and size of the first tool avoidance hole are the same as the shape and size of the second tool avoidance hole, and the positions correspond one to one.

[0015] Preferably, the pressing block is fixed to the interchangeable plate by bolts, and the outer edge of the pressing block fixed on the interchangeable plate is flush with the bottom edge of the strip groove on the same side.

[0016] Compared with the prior art, the utility model changes the original method of placing and fixing the square head three-way screw on the workbench of the CNC machine tool and then processing the square head three-way screw, and changes the original fixture fixed on the workbench of the CNC machine tool to a convenient installation and disassembly line changing fixture on the workbench of the CNC machine tool, and the square head three-way screw is installed and fixed on the interchangeable fixture outside the workbench of the CNC machine tool, which effectively improves the clamping time of the square head three-way screw, improves the positioning accuracy and fixing effect of the square head three-way screw installed on the line changing fixture, makes the quality of the processed square head three-way screw higher, reduces the standby time of the CNC machine tool and the production and processing efficiency of the CNC machine tool, thereby improving the processing efficiency of the square head three-way screw, and has broad market prospects and good economic value. The utility model provides fixing mechanisms at both ends of the base, and the fixing mechanisms include a cylinder, a pressure claw and a connecting rod. The front end of the pressure claw is abutted against the interchangeable fixture by the rising of the cylinder piston, so that the pressure claw presses the interchangeable fixture to process the workpiece to be processed; when the cylinder piston descends, the pressure claw releases the interchangeable fixture, so that the interchangeable fixture is disassembled and replaced with another interchangeable fixture that clamps the product to be processed; by arranging a plurality of protrusions around the upper end surface of the support plate, the upper end surfaces of the plurality of protrusions are on the same horizontal line, so that the contact area between the support plate and the interchangeable plate becomes smaller, which can effectively reduce the position deviation of the interchangeable fixture that is subsequently replaced due to the fall of waste materials on the support plate. The problem of increased defective rate of products produced; the interchangeable fixture is detachable and can be used to clamp the products to be processed outside the CNC machine tool production and processing line. Multiple interchangeable fixtures can be used alternately to improve the clamping efficiency; in the processing process, it is usually necessary to use more than two interchangeable fixtures. While the product on one interchangeable fixture is being processed, the product to be processed is clamped on another interchangeable fixture; when the product in the machine tool is processed, the interchangeable fixture is removed and replaced with another interchangeable fixture that clamps the product to be processed, thereby improving the clamping efficiency; limit positioning mechanisms are provided between the support plate and the interchangeable plate, and between the interchangeable plate and the pressure block, thereby improving the accuracy of positioning during clamping and reducing the time required for alignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is an exploded view of the utility model.

[0020] Figure 3It is a top view of the clamping mechanism of the utility model.

[0021] Figure 4 It is a structural schematic diagram of the interchangeable clamp of the utility model.

[0022] Figure 5 It is a bottom view of the interchangeable plate of the utility model.

[0023] Figure 6 It is a top view of the interchangeable plate of the utility model.

[0024] Figure 7 It is a bottom view of the pressing block of the utility model.

[0025] Among them, there are an interchangeable fixture 1; a clamping mechanism 2; a base 3; a fixing mechanism 4; a cylinder 41; a pressure claw 42; a connecting rod 43; a support block 5; a support plate 6; a positioning pin 61; a protrusion 62; an interchangeable plate 7; a first positioning hole 71; a strip groove 72; a first workpiece fixing groove 73; a pressure block fixing hole 74; a pressure block positioning column 75; a first tool avoidance hole 76; a pressure block 8; a second workpiece fixing groove 81; a pressure block through hole 82; a pressure block positioning hole 83; and a second tool avoidance hole 84. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the present invention, for a clearer description, the following explanation is made: the observer faces the attached Figure 1 For observation, the left front side of the observer is set as the front, the right rear side of the observer is set as the rear, the left rear side of the observer is set as the left, the right front side of the observer is set as the right, the top of the observer is set as the top, and the bottom of the observer is set as the bottom. It should be pointed out that the terms "front end", "rear end", "left side", "right side", "middle", "top", "bottom" and the like in the text indicate the orientation or position relationship based on the orientation or position relationship set in the drawings, which is only for the convenience of clearly describing the utility model, and does not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clarifying or simplifying the description, and cannot be understood as indicating or implying relative importance or quantity.

[0028] like Figures 1 to 7As shown, a quick interchange clamping device for CNC machining of square head three-way screws includes an interchange fixture 1 for fixing square head three-way screws and a clamping mechanism 2 for quickly fixing the interchange fixture 1; the clamping mechanism 2 includes a base 3, a fixing mechanism 4 arranged at both ends of the base, a plurality of support blocks 5 arranged on the upper end surface of the base and located between the two fixing mechanisms, and a support plate 6 fixed to the upper end surface of the support block; the interchange fixture 1 is fixed to the upper end of the support plate 6 through the fixing mechanism 4. The interchange fixture 1 includes an interchange plate 7 for fixing the square head three-way screw to be processed and a pressing block 8 detachably fixed on the interchange plate 7 for fixing the square head three-way screw.

[0029] In order to facilitate the disassembly of the interchangeable fixture 1 and simplify the replacement process of the interchangeable fixture 1, the structure of the clamping mechanism 2 is designed.

[0030] like Figures 1 to 3As shown, the fixing mechanism 4 is arranged on the base 3 at both ends of the base. There are multiple support blocks 5, which are fixed in the middle of the base 3 and located between the two fixing mechanisms 4. The support plate 6 is fixed at the top of the support block 5. A plurality of positioning pins 61 for positioning and fixing the interchangeable fixture 1 are provided on the upper end surface of the support plate 6. The fixing mechanism 4 includes a cylinder 41 arranged on the base 3, a pressure claw 42 for fixing the interchangeable fixture 1 on the support plate 6, and a connecting rod 43 arranged between the cylinder 41 and the pressure claw 42. The cylinder 41 is respectively arranged at both ends of the base 3, the top of the output end of the cylinder 41 is hinged to the rear end of the pressure claw 42, one end of the connecting rod 43 is hinged to the middle of the pressure claw 42, and the other end is hinged to the side of the upper end surface of the cylinder 41 close to the support plate 6; the pressure claws 42 are arranged facing each other. The interchangeable plate 7 of the utility model is fixed on the support plate, and then the front ends of the pressure claws 42 in the fixing mechanism 4 are used to press the two ends of the interchangeable plate 7, so that the interchangeable plate 7 is pressed and fixed on the support plate, thereby fixing the interchangeable fixture 1 on the upper end surface of the support plate 6. In this embodiment, the number of the support blocks 5 in this embodiment is three, and the three support blocks 5 are arranged and fixed above the base 3 and located between the two fixing mechanisms 4; the number of the positioning pins is three, and the three positioning pins are arranged along the length direction of the support plate and located on the midline of the length direction. A plurality of protrusions 62 for supporting the interchangeable plate 7 are provided on the upper end surface of the support plate 6, and the position of the protrusions 62 corresponds to the position of the support blocks 5 on the lower end surface of the support plate, and the upper end surfaces of the protrusions 62 are on the same horizontal plane. The interchangeable plate 7 is fixed on the support plate 6 and under the action of the protrusion 62, a gap is formed between the lower end surface of the interchangeable plate 7 and the upper end surface of the support plate 6, which can reduce the contact area between the support plate 6 and the interchangeable plate 7, thereby facilitating the separation of the interchangeable plate 7 and the support plate 6, and can reduce the occurrence of processing residues on the support plate 6, causing the interchangeable plate 7 to tilt, resulting in the processing position of the processed product not being consistent with the preset processing position, thereby improving the quality stability of the processed square head three-way screw.

[0031] like Figures 4 to 7 As shown, the interchangeable fixture 1 shown includes an interchangeable plate 7 for fixing the square head three-way screw to be processed and a pressure block 8 detachably fixed on the top of the interchangeable plate 7, and the bottom of the interchangeable plate 7 is provided with a first positioning hole 71 corresponding to the position of the positioning pin 61; the shape and size of the first positioning hole 71 match the shape and size of the positioning pin 61 and the number is the same, and the interchangeable fixture 1 is accurately positioned on the upper end surface of the support plate 6 through the interaction between the first positioning hole 71 and the positioning pin 61, and then the front end of the pressure claw 42 in the fixing mechanism 4 at both ends of the base 3 is used to press the interchangeable plate 7, so that the interchangeable fixture 1 is fixed on the upper end surface of the support plate 6.

[0032] like Figure 6As shown, the interchangeable plate 7 is also provided with a strip groove 72 which is recessed downward from the upper end surface of the interchangeable plate 7, a plurality of first workpiece fixing grooves 73 for fixing the square head three-way screws to be processed, a plurality of pressure block fixing holes 74 for fixing the pressure block 8, and a plurality of pressure block positioning columns 75 for positioning and fixing the pressure block 8. The strip groove 72 is arranged on the left and right side walls of the interchangeable plate 7 along the length direction of the interchangeable plate 7, and is located in the middle of the length direction of the interchangeable plate 7; the first workpiece fixing groove 73 and the pressure block fixing hole 74 are both arranged on the left and right sides of the interchangeable plate 7, and the first workpiece fixing groove 73 and the pressure block fixing hole 74 are arranged crosswise; the first workpiece fixing groove 73 and the pressure block fixing hole 74 located on the same side of the interchangeable plate 7 are on the same straight line, and are located on the inner side of the strip groove 72; the first workpiece fixing groove 73 is connected to the strip groove 72; a first tool avoidance hole 76 is provided in the first workpiece fixing groove 73, and the position of the first tool avoidance hole 76 corresponds to the position of the screw hole of the square head three-way screw to be processed, so that the residue and waste of the square head three-way screw processed by the CNC machine tool is stored in the first tool avoidance hole 76, and the waste is collected and processed uniformly when the interchangeable fixture 1 is replaced, so as to avoid the residue and waste falling onto the support plate 6, which causes the bottom surface of the interchangeable fixture 1 fixed on the support plate 6 to be not on the same horizontal plane, affecting the processing effect of the square head three-way screw. The pressure block positioning columns 75 are respectively arranged at the two ends of the straight line where the first workpiece fixing groove 73 and the pressure block fixing hole 74 are located; a plurality of operating grooves are also provided on the long side walls on both sides of the interchangeable plate 7, and the operating grooves are recessed upward from the lower end surface of the interchangeable plate, so that a plurality of larger gaps are formed between the interchangeable plate and the support plate, which is convenient for the operator to grab the interchangeable plate and reduces the difficulty of removing the interchangeable fixture from the clamping mechanism.

[0033] like Figure 7As shown, the pressing block 8 is provided with a second workpiece fixing groove 81 for fixing the square head three-way screw to be processed, a pressing block through hole 82 connecting the upper and lower surfaces of the pressing block 8, and a pressing block positioning hole 83 for positioning and fixing the pressing block 8. The position of the second workpiece fixing groove 81 corresponds to the position of the first workpiece fixing groove 73 arranged on the same side of the interchangeable plate 7. A second tool avoidance hole 84 is provided in the second workpiece fixing groove 81 for the milling cutter of the CNC machine tool to pass through the pressing block 8 to process the square head three-way screw fixed on the interchangeable plate 7. The second tool avoidance hole 84 connects the upper and lower surfaces of the pressing block 8. The position of the tool avoidance hole corresponds to the position of the screw hole of the square head three-way screw to be processed. The second tool avoidance hole 84 and the first tool avoidance hole 76 have the same shape and size, and the positions of the two correspond one to one. The pressure block through hole 82 is connected to the upper and lower surfaces of the pressure block 8, and its position corresponds to the position of the pressure block fixing hole 74 arranged on the same side of the interchangeable plate 7. The pressure block fixing hole 74 and the pressure block through hole 82 are connected by bolts to fix the pressure block 8 on the upper end surface of the interchangeable plate 7; the pressure block positioning holes 83 are respectively arranged at both ends of the pressure block 8, and their positions correspond to the pressure block positioning columns 75. The pressure block 8 is accurately fixed on the upper end surface of the interchangeable plate 7 by the interaction between the pressure block positioning holes 83 and the pressure block positioning columns 75; in this embodiment, the number of the pressure blocks 8 is two, and the two pressure blocks 8 are respectively fixed on the left and right sides of the upper end surface of the interchangeable plate 7 along the length direction of the interchangeable plate 7, and the outer edges of the pressure blocks 8 are respectively flush with the bottom edges of the strip grooves 72 on the same side thereof, and the square head three-way screws to be processed are respectively fixed on the left and right sides of the interchangeable plate 7 by the interaction between the interchangeable plate 7 and the pressure blocks 8.

[0034] The working process of the utility model is as follows: before use, the air inlet of the cylinder 41 is connected to the external electromagnetic valve; the operator places the square three-way screws to be processed in the first workpiece fixing groove 73 in the interchangeable plate 7, and then inserts the pressure block positioning hole 83 on the pressure block 8 into the pressure block positioning column 75, so that the first workpiece fixing groove 73 and the second workpiece fixing groove 81 are aligned to clamp the square head three-way screw to be processed, and then tightens the bolts used to connect the pressure block fixing hole 74 and the pressure block through hole 82, and fixes the pressure block 8 on the left and right sides of the length direction of the interchangeable plate 7, so that the square head three-way screw to be processed can be realized. Fix it to the interchangeable fixture 1; then fix the interchangeable fixture 1 to the clamping mechanism 2; wherein, the interchangeable plate 7 utilizes the first positioning hole 71 on the interchangeable plate 7 to insert the positioning pin 61, so as to realize the rapid positioning of the interchangeable fixture 1 to the support plate 6; after the interchangeable fixture is fixed on the support plate, the two cylinders 41 are started at the same time, so that the output end of the cylinder 41 rises, and the rising output end of the cylinder 41 drives the front end of the pressing claw to move downward, and then the front ends of the pressing claws 42 arranged at both ends of the base 3 are respectively abutted against the two sides of the top of the interchangeable plate 7, so as to realize the fixing of the interchangeable plate of the interchangeable fixture 1 to the clamping mechanism 2. After the processing of the square head three-way screw in the interchangeable fixture 1 fixed above the support plate 6 is completed, the output end of the cylinder 41 descends, and the descent of the output end of the cylinder 41 drives the front end of the pressure claw to move upward, so that the pressure claw 42 loosens the interchangeable plate 7, and then the interchangeable fixture 1 fixed on the clamping mechanism 2 is removed; then the interchangeable fixture 1 fixing the square three-way screw to be processed is installed on the workbench of the CNC machine tool production and processing line, and the square three-way screw to be processed is processed, thereby improving the clamping speed of the square three-way screw and effectively improving the production and processing efficiency of the square three-way screw.

[0035] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A CNC-processed quick-interchange clamping device for square head three-way screws, characterized in that: The invention comprises an interchangeable fixture (1) for fixing a square head three-way screw and a clamping mechanism (2) for quickly fixing the interchangeable fixture (1); the clamping mechanism (2) comprises a base (3), fixing mechanisms (4) arranged at both ends of the base, a plurality of support blocks (5) arranged on the upper end surface of the base and located between the two fixing mechanisms, and a support plate (6) fixed to the upper end surface of the support block; the fixing mechanism (4) comprises a cylinder (41) arranged on the base, a pressure claw (42) for fixing the interchangeable fixture (1) on the support plate (6), and a connecting rod (43) arranged between the cylinder and the pressure claw; the cylinder (41) is respectively fixed to both ends of the base (3), and the output end of the cylinder (41) is hinged to the rear end of the pressure claw (42); one end of the connecting rod (43) is hinged to the middle part of the pressure claw (42), and the other end is hinged to the side of the upper end surface of the cylinder (41) close to the support plate (6); a plurality of holes for positioning and fixing the interchangeable fixture (1) are provided on the upper end surface of the support plate (6). The interchangeable fixture (1) comprises an interchangeable plate (7) for fixing a square head three-way screw to be processed and a pressure block (8) detachably fixed on the upper side of the interchangeable plate (7); a first positioning hole (71) corresponding to the position of the positioning pin (61) is provided at the bottom of the interchangeable plate (7); the first positioning hole (71) matches the shape and size of the positioning pin (61); the interchangeable fixture (1) uses the first positioning hole (71) on the interchangeable plate (7) to interact with the positioning pin (61) on the support plate (6) to accurately fix it on the upper end surface of the support plate (6), and then uses the front end of the pressure claw (42) in the fixing mechanism (4) to press the interchangeable plate (7); the number of the pressure blocks (8) is two, and the two pressure blocks (8) are respectively fixed on the upper end surfaces of the left and right sides of the interchangeable plate (7) along the length direction of the interchangeable plate (7); the square head three-way screw to be processed is respectively fixed on the left and right sides of the interchangeable plate (7) by using the interaction between the interchangeable plate (7) and the pressure blocks (8).

2. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 1 is characterized in that: The upper end surface of the support plate (6) is further provided with a plurality of protrusions (62) for supporting the interchangeable plate (7), and the upper end surfaces of the protrusions (62) are located on the same horizontal plane; the interchangeable plate (7) is fixed on the support plate (6) and, under the action of the protrusions, a gap is formed between the lower end surface of the interchangeable plate (7) and the upper end surface of the support plate (6).

3. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 2 is characterized in that: The position of the protrusion (62) corresponds to the position of the support block (5).

4. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 3 is characterized in that: The interchangeable plate (7) is further provided with a strip groove (72) sunken downward from the upper end surface of the interchangeable plate, a plurality of first workpiece fixing grooves (73) for fixing the square head three-way screws to be processed, a plurality of pressure block fixing holes (74) for fixing the pressure blocks, and a plurality of pressure block positioning columns (75) for positioning and fixing the pressure blocks; the strip groove (72) is arranged on the left and right side walls of the interchangeable plate (7) along the length direction of the interchangeable plate (7) and is located in the middle of the length direction of the interchangeable plate (7); the first workpiece fixing groove (73) and the pressure block fixing hole (74) are arranged on the left and right sides of the interchangeable plate (7), and the first workpiece fixing groove (73) and the pressure block fixing hole (74) are arranged crosswise; the first workpiece fixing groove (73) and the pressure block fixing hole (74) located on the same side of the interchangeable plate (7) are on the same straight line and are located on the inner side of the strip groove (72); the first workpiece fixing groove (73) is connected to the strip groove (72); the pressure block positioning column (75) is respectively arranged at the two ends of the straight line where the first workpiece fixing groove (73) and the pressure block fixing hole (74) are located.

5. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 4 is characterized in that: The pressing block (8) is provided with a second workpiece fixing groove (81) for fixing the square head three-way screw to be processed, a pressing block through hole (82) connecting the upper and lower surfaces of the pressing block, and a pressing block positioning hole (83) for positioning and fixing the pressing block.

6. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 5 is characterized in that: The pressing block positioning holes (83) are respectively arranged at both ends of the pressing block, and their positions correspond to the positions of the pressing block positioning columns (75).

7. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 6 is characterized in that: The position of the second workpiece fixing groove (81) corresponds to the position of the first workpiece fixing groove (73) arranged on the same side of the interchangeable plate; the position of the pressing block through hole (82) corresponds to the position of the pressing block fixing hole (74) arranged on the same side of the interchangeable plate.

8. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 7 is characterized in that: The first workpiece fixing groove (73) is provided with a first tool avoidance hole (76) whose position corresponds to the position of the screw hole of the square head three-way screw to be processed; the second workpiece fixing groove (81) is provided with a second tool avoidance hole (84) which communicates with the upper and lower surfaces of the pressure block and whose position corresponds to the position of the screw hole of the square head three-way screw to be processed.

9. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 8, characterized in that: The shape and size of the first tool avoidance hole (76) are the same as the shape and size of the second tool avoidance hole (84), and the positions correspond one to one.

10. The CNC machining quick-interchange clamping device for square head three-way screws according to claim 9, characterized in that: The pressing block (8) is fixed to the interchangeable plate (7) by means of bolts, and the outer edge of the pressing block fixed to the interchangeable plate (7) is flush with the bottom edge of the strip groove (72) on the same side.

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