A universal clamping system for press die finishing

Abstract

The present application relates to a kind of machine tool components, in particular to a kind of universal clamping system for press die plate finishing, including fixture base plate, several equal-height support module and shock absorption compensation module for supporting workpiece and can be jet self-cleaning are arranged in array on the fixture base plate, clamp module is also provided on the fixture base plate, the clamp module is set to the two sides of workpiece length direction and the two ends of width direction.The universal clamping system for press die plate finishing of the present application has the beneficial effects that workpiece is supported by equal-height support module and shock absorption compensation module from Z axis direction, and then workpiece is fixed by pneumatic jacking part from all around, the accurate stable fixation support of die plate workpiece is realized;Equal-height support module has the jet channel of self-cleaning support surface, and shock absorption compensation module is used to compensate the contact gap formed by the uneven or deformation of the surface of workpiece being supported.

Description

Technical Field

[0001] This invention relates to a machine tool component, and more particularly to an automated clamping system used for milling upper and lower templates on large presses; this invention is mainly applied to milling machines, gantry milling machines, vertical machining centers, and gantry machining centers with spindles that move in the vertical direction. Background Technology

[0002] In existing technologies, the upper and lower templates used in presses require high dimensional and positional tolerances and surface quality. Furthermore, the demand for non-standard customized templates with different structural dimensions is increasing. When processing such non-standard products, the typical method for clamping and positioning the workpiece is to place the template flat on leveling pads on the worktable of the processing equipment, and then secure the edges with multiple clamping blocks. This clamping method can only meet the needs of rough machining or machining with low precision requirements. For situations requiring high precision, or when the workpiece is uneven due to unevenness of the machining reference surface or machining stress, high-precision machining becomes difficult to achieve.

[0003] To accommodate the positioning and clamping of templates of different sizes, a versatile clamping fixture that meets machining accuracy requirements is needed to achieve rapid workpiece clamping and fastening. To ensure stable template clamping, the surfaces of the support shims must be kept clean, especially free of granular debris. Manual cleaning is not only time-consuming but also difficult to adapt to the pace of batch and automated production. During semi-finishing, to overcome deformation caused by uneven template reference surfaces or machining stress, a local compensation device needs to be designed to achieve stable support and reduce vibration during milling. Furthermore, the templates used for clamping need to be adaptable to accommodate position adjustments and clamping force requirements on different machine tools.

[0004] Based on the milling and finishing requirements of the above templates, it is necessary to design a tooling clamping system with certain versatility. This system is specifically designed for milling templates or similar plate-like workpieces of different sizes to meet the requirements of high-precision, automated, and efficient milling. Summary of the Invention

[0005] Based on the clamping requirements of precision-machined press templates in the prior art, this invention provides a universal clamping system for precision machining of press templates. The system features an automatic cleaning structure, a support height compensation structure, and clamping components with certain size adaptability and clamping force adjustment functions on the surface of the equal-height support components to meet the processing requirements of high precision, automation, and high efficiency.

[0006] The purpose of this invention is achieved as follows: a universal clamping system for precision machining of press templates, characterized in that it includes a clamping base plate, on which several equal-height support modules and shock-absorbing compensation modules for supporting workpieces and capable of self-cleaning by air jet are arranged in an array, and the clamping base plate is also provided with clamping modules, which are located on both sides of the workpiece in the length direction and at both ends in the width direction.

[0007] The equal-height support module is used to support the template to be processed. It includes a support base with a central hole in the center. A liftable piston rod is installed in the central hole. A downward-through air jet channel is provided in the center of the piston rod. An air inlet is provided at the lower end of the air jet channel. The top of the air jet channel is sealed. Several air jet holes are provided around the top of the air jet channel. Sealing components are provided on the upper and lower sides of the piston rod and the circumference of the central hole, respectively. When the piston rod rises to the air jet hole position and extends out of the top of the support base, the pressurized gas in the air jet channel is ejected from the air jet holes to purge the top surface of the support base. A first piston is provided at the lower part of the piston rod. The support base corresponding to the first piston has an air inlet chamber and a first air inlet channel. The first air inlet channel is connected to the air inlet chamber and is used to introduce gas into the air inlet chamber to push the first piston down, thereby driving the piston rod to return to its original position.

[0008] The shock absorption compensation module includes a fixed support platform. The fixed support platform has a first-stage stepped hole and a second-stage stepped hole with decreasing inner diameters at its center. A compensation rod is installed within each of the first and second-stage stepped holes. A guide cap is provided on the upper part of the compensation rod, guiding and engaging with the first-stage stepped hole. A support spring is sleeved on the lower side of the guide cap, abutting against the step surface below the second-stage stepped hole, ensuring the top surface of the guide cap is higher than the top surface of the fixed support platform. The lower end of the compensation rod passes through the center of the lower side of the second-stage stepped hole and extends outwards. A second piston is fixed to the lower end, and the second piston is limited and abuts against the top wall of the through-hole portion of the compensation rod. The fixed support platform has an upper cavity and a lower cavity corresponding to the upper and lower sides of the second piston, respectively. A second air intake channel is provided on the periphery of the fixed support platform corresponding to the upper cavity, and a balance air hole is provided on the lower side of the lower cavity.

[0009] The clamping module includes a base fixed to the fixture base plate, and the base is provided with a pneumatic clamping component, the clamping direction being perpendicular to the side of the workpiece being clamped.

[0010] The beneficial effects of the universal clamping system for precision machining of press templates of the present invention are as follows: A height-equal support module is set up to support the template-type workpiece to be processed. A liftable piston rod is set at the center of the support base, and an air jet channel is set at the center of the piston rod. When pressurized gas is introduced into the air jet channel, the piston rod is first raised to expose the air jet hole, which can directly and automatically blow away debris from the surface of the support base, thus automatically cleaning the support surface. After blowing, air is introduced into the air intake chamber through the first air intake channel, which can lower the top of the piston rod back into the central hole of the air jet hole. The function of the shock absorption and compensation module is to compensate for unevenness or deformation of the supported surface of the workpiece, preventing it from fully contacting the support base of the height-equal support module. The gap formed by contact allows the compensation rod, under the action of the support spring, to extend from the upper surface of the fixed support platform to support and compensate the support components with the compensation gap. The second air intake channel is connected to the upper cavity. Through the air pressure acting unidirectionally on the upper cavity, the second piston and the compensation rod can be pushed to move downward against the elastic force of the support spring, thereby flexibly compensating for uneven workpiece support surfaces. In addition, the support spring has the effect of shock absorption compensation while performing support compensation. The workpiece is supported at the same height from the Z-axis direction by the equal height support module and the shock absorption compensation module, and then the pneumatic clamping component clamps and fixes the workpiece from all sides, realizing precise and stable fixed support for template-type workpieces.

[0011] To facilitate the universal installation of the equal-height support module and the vibration damping compensation module on the fixture base plate, the height of the top surface of the fixed support platform above the surface of the fixture base plate is less than the height of the top surface of the support base above the surface of the fixture base plate. The bottom outer periphery of the support base is provided with a radially protruding first flange, and the bottom outer periphery of the fixed support platform is provided with a radially protruding second flange. The first flange and the second flange have the same axial thickness and outer diameter. The first flange and the second flange are provided with a number of stepped through holes for bolt connection at equal intervals around their circumferences, and the number and diameter of the stepped through holes are the same, and the diameter of the stepped through holes matches the bolt size.

[0012] To further improve the versatility of the height support module and the vibration compensation module in the fixture base plate, both the first and second air intake channels are right-angle turns, including a horizontal section and a vertically downward section. The distance between the vertical section of the first air intake channel and the central axis of the support base is D1, and the distance between the vertical section of the second air intake channel and the central axis of the fixed support platform is D2, and D1 and D2 are equal. The vertical section is used to connect to the pressure air supply pipeline.

[0013] To flexibly adapt to the installation positions of the equal height support module and the shock absorption compensation module on the fixture base plate, the fixture base plate is provided with three fixed countersunk holes corresponding to the installation positions of each group of modules. Two of the fixed countersunk holes are used to install the equal height support module and the shock absorption compensation module of each group, respectively, and the third fixed countersunk hole is a spare countersunk hole and is sealed with a pressure cap.

[0014] The fixed countersunk holes and air supply lines can also be rearranged and designed according to the external dimensions of the template being processed, without changing the underlying logic.

[0015] The first flange and the second flange are respectively fitted into the corresponding fixed countersunk holes with clearance fit. The bottom surface of the fixed countersunk hole is provided with a threaded hole corresponding to the position of the stepped through hole of the first flange or the second flange. The bolts pass through the stepped through hole and screw into the threaded hole respectively.

[0016] Each of the fixed countersunk holes has a central air hole at its center, and an eccentric air hole is provided at a distance D3 from the central air hole, wherein D3 is equal to D1; the fixture base plate is provided with an internal first branch that communicates with the central air hole of each fixed countersunk hole and an internal second branch that communicates with the eccentric air hole. The internal first branch and the internal second branch are respectively converged into a first air passage interface and a second air passage interface for connecting to an external air supply or exhaust pipe.

[0017] To facilitate the supply of pressurized air to each module branch, the fixture base plate is provided with an air path splitter that connects to the first air path interface and the second air path interface. The air path splitter is used to connect to the air supply line or the exhaust line.

[0018] To facilitate efficient blowing of the support surface of the high-support module, the jet hole is deflected downwards by 5-10° along the radial direction of the piston rod.

[0019] To facilitate securing the side of the workpiece, a slide block is slidably mounted on the base of the clamping module via a guide groove. The position of the slide block is adjusted by a lead screw, and a pneumatic clamping component is provided on the upper side of the slide block for clamping the workpiece.

[0020] To facilitate flexible adaptation to workpiece size, the sliding block is perpendicular to the side of the workpiece to be clamped along the sliding direction of the guide groove; the pneumatic clamping component includes a clamping cylinder, and a top block is installed on the piston rod of the clamping cylinder; a detachable extension top block is installed at the front end of the top block, and the front end of the top block is provided with at least two insertion holes, and the side of the extension top block is provided with a pin that is inserted into the insertion hole.

[0021] Furthermore, the clamping direction of the clamping cylinder is horizontal.

[0022] To facilitate the installation of the clamping module on the fixture base plate according to the workpiece size, the bottom surface of the fixture base plate is rectangular. Corner mounting areas are provided at the four corners of the fixture base plate, and length mounting areas are provided between adjacent corner mounting areas along the width direction. Several T-shaped fixing slots parallel to the width direction of the fixture base plate are provided at equal intervals in each corner mounting area. Two to three T-shaped fixing slots parallel to the length direction of the fixture base plate are provided at equal intervals in each length mounting area. All T-shaped fixing slots have the same cross-sectional dimensions, and the spacing between adjacent T-shaped fixing slots within the same mounting area is equal. The base of the clamping module has two rows of fixing holes. The arrangement direction of each row of fixing holes is parallel to the pneumatic clamping direction of the clamping cylinder. The spacing between the two rows of fixing holes is equal to the spacing between adjacent T-shaped fixing slots. After the base is aligned with the corresponding T-shaped fixing slot, it is fixed by T-blocks and bolts. Attached Figure Description

[0023] Figure 1 This is a perspective view (with workpiece) of the universal clamping system for precision machining of press templates according to the present invention.

[0024] Figure 2 This is a perspective view (without the workpiece) of the universal clamping system for precision machining of press templates according to the present invention.

[0025] Figure 3 This is a schematic diagram of the equal-height support module structure.

[0026] Figure 4 This is a schematic diagram of the vibration damping compensation module.

[0027] Figure 5 This is a schematic diagram of the clamping state of the clamping module.

[0028] Figure 6 This is a 3D view of the clamping module.

[0029] Figure 7 This is a schematic diagram of the fixture base plate.

[0030] The components include: 1. Workpiece; 2. Fixture base plate; 201. Fixed countersunk hole; 201A. Threaded hole; 201B. Center air hole; 201C. Eccentric air hole; 202. Corner mounting area; 203. Length mounting area; 204. T-shaped fixing groove; 205. Internal first branch; 206. Internal second branch; 3. Air circuit splitter; 4. Clamping module; 401. Base; 401A. Slide groove; 402. Slide seat; 403. Clamping cylinder; 404. Top block; 405. Lead screw; 406. Extending top block; 407. Fixing hole; 5. Equal height support module; 501. Support base; 502. Piston rod; 503. Air jet hole; 504. First air intake channel; 505. First flange; 506. Air jet channel; 507. Air intake chamber; 508. First piston; 509. Step perforation; 510. Air inlet. 6. Vibration damping compensation module; 601. Compensation rod; 601A. Guide cap; 602. Fixed support platform; 602A. First step hole; 602B. Second step hole; 603. Support spring; 604. Upper cavity; 605. Second piston; 606. Lower cavity; 607. Balance air hole; 608. Second air intake channel; 609. Step perforation; 610. Second flange. Detailed Implementation

[0031] The following describes in detail, with reference to the accompanying drawings, the universal clamping system for precision machining of press templates according to the present invention. This universal clamping system for precision machining of press templates is suitable for machining thick plate-like workpieces of a certain thickness, similar to machine tool templates, and is particularly suitable for the automated clamping and machining of large template-like workpieces with high precision requirements.

[0032] like Figure 1 and Figure 2 As shown, the universal clamping system for precision machining of press templates of the present invention includes a clamping base plate 2. Several equal-height support modules 5 and shock-absorbing compensation modules 6 for supporting workpiece 1 and capable of self-cleaning by air jet are arranged in an array on the clamping base plate 2. The clamping base plate 2 is also provided with a clamping module 4, which is disposed on both sides in the length direction and both ends in the width direction of the workpiece 1 for clamping from the outside of the workpiece 1.

[0033] like Figure 3As shown, the equal-height support module 5 is used to support the template workpiece to be processed. It includes a support base 501, with a central hole at its center. A liftable piston rod 502 is located within the central hole. A downward-through air jet channel 506 is located at the center of the piston rod 502. An air inlet 510 is located at the lower end of the air jet channel 506. The top of the air jet channel 506 is sealed. Several air jet holes 503 are arranged around the top circumference of the air jet channel 506. Sealing components are provided on the upper and lower sides of the piston rod 502 corresponding to the central hole, respectively. Specifically, sealing grooves are provided on the upper and lower sides of the circumference of the piston rod 502 corresponding to the air jet hole 503, and sealing rings are installed within the sealing grooves. When the top of the piston rod 502 is not extended from the support base, the air jet hole 503 is sealed by the upper and lower sealing grooves. The sealing ring is used for sealing. When the piston rod 502 rises to the position of the jet hole 503 and extends out of the top of the support base, the pressurized gas in the jet channel 506 is ejected from the jet hole 503 to blow away the debris on the top surface of the support base 501. In order to facilitate efficient blowing of the upper surface of the support base 501, the jet hole 503 is deflected downward along the radial direction of the piston rod 502 by 5-10°, so that the ejected airflow blows the support surface obliquely downward. In order to facilitate the piston rod to retract into the central hole after blowing, a first piston 508 is provided at the lower part of the piston rod 502. The support base 501 corresponding to the first piston 509 is provided with an air inlet chamber 507 and a first air inlet channel 504. The first air inlet channel 504 is connected to the air inlet chamber 507 and is used to introduce gas into the air inlet chamber 507 to push the first piston 508 downward, thereby driving the piston rod 502 to return to its original position downward. In the structure of the equal-height support module 5 of the present invention, when the workpiece is supported, the top of the piston rod 502 is retracted to a height slightly lower than that of the support base 501. When a new workpiece is installed, air is pressurized from the air inlet 510 at the bottom to the jet channel 506. After the jet channel 506 is pressurized, it lifts the piston rod 502 upward until the jet hole 503 is exposed in the center hole of the support base 501 and begins to spray air to clean the upper surface of the support base 501, thus completing the cleaning work of the support base 501. Then the jet channel 506 stops air intake, and at the same time the first air intake channel 504 begins to intake air and pushes the first piston 508 downward through the air intake chamber 507, so that the top of the piston rod 502 retracts to a height slightly lower than that of the top surface of the support base 501, thus completing the self-cleaning work before the workpiece is installed.

[0034] To adapt to the unevenness of the supported surface of the workpiece, the vibration damping compensation module of the present invention, as follows: Figure 4As shown, the device includes a fixed support platform 602. The fixed support platform 602 has a two-stage stepped hole 602A and a second stepped hole 602B with decreasing inner diameters at its center. A compensating push rod 601 is installed inside the first-stage stepped hole 602A and the second-stage stepped hole 602B. A guide cap 601A is installed on the upper part of the compensating push rod 601. The guide cap 601A guides and cooperates with the first-stage stepped hole 602A. A support spring 603 is sleeved on the lower side of the guide cap 601A. The support spring 603 abuts against the step surface on the lower side of the guide cap 601A and the second-stage stepped hole 602B, causing the guide cap 601A to... The top surface of the guide cap 601 is higher than the top surface of the fixed support platform 602. The lower end of the compensating push rod 601 passes through the bottom center of the second-stage step hole 602B and extends out. A second piston 605 is fixed at the lower end, and the second piston is limited to abutting against the top wall of the compensating push rod penetration part. The fixed support platform 602 is provided with an upper cavity 604 and a lower cavity 606 on the upper and lower sides corresponding to the second piston 605, respectively. The upper cavity 604 is provided with a second air intake channel 608 on the periphery of the fixed support platform 602. The lower side of the lower cavity 606 is provided with a balancing air hole 607 for balancing the air pressure in the lower cavity 606 when the second piston moves up and down. The working principle of the shock absorption compensation module of the present invention is as follows: Since the top surface of the guide cap 601A is slightly higher than the fixed support platform 602 before supporting the workpiece, the surface of the workpiece first contacts the guide cap 601A. Under the weight of the workpiece, the guide cap can be pressed down by a certain displacement to compensate for the contact gap caused by the deformation of the workpiece. In addition, for lighter workpieces, by pressurizing the upper chamber 604 above the second piston 605, the workpiece 1 can be pressed down synchronously, preventing the workpiece from being suspended due to excessive elastic force.

[0035] To facilitate the fixed installation of the equal-height support module and the shock-absorbing compensation module on the fixture base plate 2, the bottom outer periphery of the support base 501 is provided with a radially protruding first flange 505, and the bottom outer periphery of the fixed support platform 602 is provided with a radially protruding second flange 610. The first flange 505 and the second flange 610 have the same axial thickness and outer diameter. The first flange 505 and the second flange 610 are provided with a number of stepped through holes 509 and stepped through holes 611 for bolt connection at equal intervals around their circumferences. The number and diameter of the stepped through holes on each module are the same, and the diameter of the stepped through holes matches the bolt size. That is, the dimensions of the bottom mounting parts of the support base 501 and the fixed support platform 602 are the same, which facilitates the setting of a universal mounting structure on the fixture base plate 1; in order to facilitate the universal setting of the air intake channel, the first air intake channel 504 and the second air intake channel 608 are both right-angle turns, including a horizontal section and a vertically downward section. The distance between the vertical section of the first air intake channel 504 and the central axis of the support base 501 is D1, and the distance between the vertical section of the second air intake channel 608 and the central axis of the fixed support platform 602 is D2, and D1 and D2 are equal; the vertical section is used to connect to the pressure air supply pipeline.

[0036] like Figure 7 As shown, to flexibly adapt to the installation positions of the equal-height support module 5 and the vibration damping compensation module 6 on the fixture base plate 2, the fixture base plate 2 is provided with three fixed countersunk holes 201 corresponding to the installation positions of each module. Two of the fixed countersunk holes 201 are used to install the equal-height support module 5 and the vibration damping compensation module 6, respectively, and the third fixed countersunk hole is a spare countersunk hole and is sealed with a pressure cap for later use. The first flange 505 and the second flange 610 are respectively fitted into the corresponding fixed countersunk holes 201 with clearance fit. The bottom surface of the fixed countersunk hole 201 is provided with threaded holes 201 corresponding to the positions of the stepped through holes of the first flange 505 or the second flange 610. A. Bolts pass through the stepped through holes and screw into the threaded holes 201A respectively; each fixed countersunk hole 201 has a central air hole 201B at its center, and an eccentric air hole 201C is located at an eccentric distance D3 from the central air hole 201B, where D3 is equal to D1; the fixture base plate 2 has an internal first branch 205 communicating with the central air hole 201B of each fixed countersunk hole 201 and an internal second branch 206 communicating with the eccentric air hole 201C. The internal first branch 205 and the internal second branch 206 converge to form a first air passage interface and a second air passage interface, respectively, for connecting to external air supply or exhaust pipes. To facilitate the setting of the internal first branch and internal second branch in the fixture base plate, the two branches are arranged in layers in the fixture base plate 2; to facilitate the supply of pressurized air to each module branch, the fixture base plate 2 has an air passage splitter 3 connected to the first air passage interface and the second air passage interface, and the air passage splitter 3 is used to connect to the air supply pipe or exhaust pipe. In each fixed countersunk hole, whether it is used to install the equal height support module 5 and the shock absorption compensation module 6 or as a spare fixed countersunk hole, in order to facilitate the control of the air passage opening and closing, a valve that is easy to open and close is installed in the central air hole 201B and the eccentric air hole 201C of each fixed countersunk hole. The two valves of the central air hole and the eccentric air hole of the same function module are controlled by the control signal to control the opening and closing action in a unified manner, so as to facilitate the synchronous operation of the air passage within the same function module.

[0037] like Figure 5 and Figure 6As shown, the clamping module 4 includes a base 401 fixed to the fixture base plate 2. A pneumatic clamping component is provided on the base 401, with the clamping direction perpendicular to the side of the workpiece to be clamped. To facilitate clamping the side of the workpiece, a slide block 402 is slidably mounted on the base 401 of the clamping module 4 via a guide groove. The slide block 402 is adjusted in position by a lead screw 405. A pneumatic clamping component is provided on the upper side of the slide block for clamping the workpiece from the side. To flexibly adapt to workpiece dimensions, the slide block 402 is perpendicular to the side of the workpiece to be clamped along the sliding direction of the guide groove. The pneumatic clamping component includes a clamping cylinder 403, with the clamping direction of the clamping cylinder 403 being horizontal. A top block 404 is mounted on the piston rod of the clamping cylinder 403. This top block can directly clamp the side of the workpiece. The position of the slide block 402 is initially adjusted by adjusting the position of the lead screw 405, and then the position is precisely adjusted by adjusting the clamping cylinder to clamp the side of the workpiece. In order to accommodate workpieces of a certain size range, a detachable extension block 406 is installed at the front end of the top block 404. The front end of the top block 404 is provided with at least two insertion holes, and the side of the extension block 406 is provided with corresponding pins that are inserted into the insertion holes. In this way, with the installation position of the base and the fixture base plate unchanged, the workpiece can be clamped by the top block 404 or by adding the extension block 406, which can accommodate workpieces of a certain size range.

[0038] To facilitate the installation of the clamping module 4 on the fixture base plate 2 according to the workpiece size, the bottom surface of the fixture base plate 4 is rectangular. Corner mounting areas 202 are provided at each of the four corners of the fixture base plate 4. Between adjacent corner mounting areas along the width direction, length mounting areas 203 are provided. Each corner mounting area 202 has several T-shaped fixing grooves 204 at equal intervals, parallel to the width direction of the fixture base plate 2. Each length mounting area 203 has 2-3 grooves at equal intervals, parallel to the length direction of the fixture base plate 2. T-shaped fixing slots 204, each T-shaped fixing slot 204 has the same cross-sectional dimensions, and the spacing between adjacent T-shaped fixing slots 204 in the same installation area is equal; the base 401 of the clamping module 4 is provided with two rows of fixing holes 407, the arrangement direction of each row of fixing holes 407 is parallel to the pneumatic clamping direction of the clamping cylinder 403, and the spacing between the two rows of fixing holes 407 is equal to the spacing between adjacent T-shaped fixing slots 204. After the base 401 is aligned with the T-shaped fixing slots 204 at the corresponding installation position, it is fixed by T-shaped blocks and bolts respectively.

[0039] Through the fixed installation structure of the clamping module 4 and the fixture base plate 2, the number and position of the clamping modules can be initially determined according to the outer dimensions and size of the workpiece. The clamping module 4 is fixed on the T-shaped fixing groove 204 at the corresponding position. After the workpiece is placed, the position of the slide block 402 is roughly adjusted by the lead screw on the clamping module 4. Then, it is determined whether to install the range extender top block according to the specific size and outer edge structure of the workpiece. Finally, the workpiece is fixed by the clamping cylinder 404.

[0040] The clamping process of the universal clamping system for precision machining of press templates of the present invention is as follows: Pressurized gas is simultaneously injected into the air jet channels of each equal-height support module, pushing the piston rod 502 upwards to expose the air jet hole 503. Gas is then sprayed to clean the top surface of the support base 501. After a certain delay in spraying, the air jet channels stop supplying gas. After the air supply channel of the eccentric air hole connected to the first air inlet channel 504 is opened, the air inlet chamber on the upper side of the first piston 508 is pressurized, pushing the first piston 508 and causing the piston rod to move downwards and reset until the piston rod 502 retracts into the center hole of the support base 501. The air jet hole... The seal is retracted again to complete the self-cleaning of the equal-height support module before supporting the workpiece. At this time, the second air inlet channel and the balance air hole of the shock absorption compensation module are closed, and the compensation top rod protrudes slightly from the fixed support platform under the action of the support spring 603. After the air is sprayed over the support surface, the number and arrangement of the clamping module 4 are adjusted according to the size of the workpiece, and the clamping modules are fixed on the surface of the clamping base plate 2 respectively. Then the workpiece is placed, and the position of the slide is initially adjusted by the lead screw so that the top block or the extended top block connected to the clamping cylinder 403 contacts the side of the workpiece. Then the clamping cylinder 403 is activated to pressurize and clamp the workpiece, thus completing the support and fixation of the workpiece. When the aforementioned workpiece is supported by the equal-height support module 5 and the shock-absorbing compensation module 6, the workpiece 1 first contacts the top of the protruding compensation rod of the shock-absorbing compensation module 6. Through the support of the support spring 603, the gap caused by unevenness can be compensated, and the workpiece is supported by the support spring 603 with a certain shock-absorbing effect. When the workpiece is light, the pressure air source of the second air inlet channel 608 is opened to pressurize the upper cavity 604, balancing part of the elastic force of the support spring 603 to support the workpiece stably. Therefore, the universal clamping system for precision machining of press templates of the present invention can adapt to the clamping of template-type workpieces of different sizes and specifications during precision machining. Before clamping, the surface of the support component is automatically cleaned, and the unevenness of the supported surface of the workpiece is compensated for the problem of unstable support. At the same time, the lateral clamping component can be adjusted and fixed on the surface of the clamping base plate according to the size of the workpiece, and the position and clamping force of the clamping component can be precisely adjusted by the tightening component, which facilitates batch and automated clamping and changing of workpieces.

Claims

1. A universal clamping system for precision machining of press templates, characterized in that, The fixture includes a base plate (2), on which several equal-height support modules (5) and shock-absorbing compensation modules (6) are arranged in an array to support the workpiece (1) and can be self-cleaned by air jet. The base plate (2) is also provided with a clamping module (4), which is located on both sides of the workpiece (1) in the length direction and at both ends in the width direction. The equal-height support module (5) is used to support the workpiece to be processed, including a support base (501). The support base (501) has a central hole, and a liftable piston rod (502) is provided in the central hole. The piston rod (502) has a downward-through jet channel (506) in the center. The lower end of the jet channel (506) has an air inlet (510). The top of the jet channel (506) is sealed. The top of the jet channel (506) has several jet holes (503) around its circumference. The upper and lower sides of the jet holes (503) are respectively provided with sealing components on the piston rod (502) and the circumference of the central hole. When the piston... After the rod (502) is raised to the position of the jet hole (503) and extends out of the top of the support base (501), the pressurized gas in the jet channel (506) is ejected from the jet hole (503) to purge the top surface of the support base (501); the lower part of the piston rod (502) is provided with a first piston (508), and the support base (501) corresponding to the first piston (508) is provided with an air inlet chamber (507) and a first air inlet channel (504). The first air inlet channel (504) is connected to the air inlet chamber (507) and is used to introduce gas into the air inlet chamber (507) to push the first piston (508) down, thereby driving the piston rod (502) to reset downward; The shock absorption compensation module (6) includes a fixed support platform (602). The fixed support platform (602) has a first-stage stepped hole and a second-stage stepped hole with decreasing inner diameters at its center. A compensation top rod is provided in the first-stage stepped hole and the second-stage stepped hole. A guide cap (601A) is provided on the upper part of the compensation top rod. The guide cap (601A) guides and cooperates with the first-stage stepped hole. A support spring (603) is sleeved on the lower side of the guide cap (601A). The support spring (603) abuts against the guide cap (601A) and the step surface on the lower side of the second-stage stepped hole to make the guide cap (601A)... The top surface of 601A is higher than the top surface of the fixed support platform (602); the lower end of the compensation rod passes through the center of the lower side of the second-stage step hole and extends out, and the lower end is fixed with a second piston (605), which is limited to abutting against the top wall of the through part of the compensation rod; the fixed support platform (602) is provided with an upper cavity and a lower cavity (606) respectively corresponding to the upper and lower sides of the second piston (605), the upper cavity is provided with a second air intake channel (608) on the periphery of the fixed support platform (602), and the lower cavity (606) is provided with a balance air hole (607) on the lower side; The clamping module (4) includes a base fixed to the clamping base plate (2), and the base is provided with a pneumatic clamping component, the clamping direction being perpendicular to the side of the workpiece (1) that is clamped.

2. The universal clamping system for precision machining of press templates according to claim 1, characterized in that, The height of the top surface of the fixed support platform (602) above the surface of the fixture base plate (2) is less than the height of the top surface of the support base (501) above the surface of the fixture base plate (2); the bottom outer periphery of the support base (501) is provided with a radially protruding first flange (505), and the bottom outer periphery of the fixed support platform (602) is provided with a radially protruding second flange (610); the first flange (505) and the second flange (610) have the same axial thickness and outer diameter; the first flange (505) and the second flange (610) are provided with a number of stepped through holes for bolt connection at equal intervals around their circumferences, and the number and diameter of the stepped through holes are the same, and the diameter of the stepped through holes matches the bolt size.

3. The universal clamping system for precision machining of press templates according to claim 2, characterized in that, The first air intake channel (504) and the second air intake channel (608) are both right-angle turns, including a horizontal section and a vertical section that goes straight down. The distance between the vertical section of the first air intake channel (504) and the central axis of the support base (501) is D1, and the distance between the vertical section of the second air intake channel (608) and the central axis of the fixed support platform (602) is D2, and D1 and D2 are equal. The vertical section is used to connect to the pressure air supply pipeline.

4. The universal clamping system for precision machining of press templates according to claim 3, characterized in that, The fixture base plate (2) is provided with three fixed countersunk holes (201) corresponding to the installation position of each group of modules. Two of the fixed countersunk holes (201) are used to install the equal height support module (5) and the shock absorption compensation module (6) of each group, respectively. The third fixed countersunk hole (201) is a spare countersunk hole and is sealed with a pressure cap. The first flange (505) and the second flange (610) are respectively fitted into the corresponding fixed countersunk holes (201) with clearance fit. The bottom surface of the fixed countersunk hole (201) is provided with a threaded hole (201A) corresponding to the position of the stepped through hole of the first flange (505) or the second flange (610). The bolts pass through the stepped through hole and screw into the threaded hole (201A). Each of the fixed countersunk holes (201) has a central air hole (201B) at its center, and an eccentric air hole (201C) is provided at an eccentric distance D3 from the central air hole (201B), wherein D3 is equal to D1; the fixture base plate (2) is provided with an internal first branch that communicates with the central air hole (201B) of each fixed countersunk hole (201) and an internal second branch that communicates with the eccentric air hole (201C). The internal first branch and the internal second branch are respectively converged into a first air passage interface and a second air passage interface for connecting to an external air supply or exhaust pipe.

5. The universal clamping system for precision machining of press templates according to claim 4, characterized in that, The fixture base plate (2) is provided with an air path splitter (3) connected to the first air path interface and the second air path interface. The air path splitter (3) is used to connect to the air supply line or the exhaust line.

6. The universal clamping system for precision machining of press templates according to claim 1, characterized in that, The jet hole (503) is deflected downwards by 5-10° along the radial direction of the piston rod (502).

7. The universal clamping system for precision machining of press templates according to claim 1, characterized in that, The base of the clamping module (4) is slidably mounted on a slide block (402) via a guide groove. The slide block (402) is driven to adjust its position by a lead screw (405). A pneumatic clamping component is provided on the upper side of the slide block (402) for clamping the workpiece (1).

8. The universal clamping system for finishing press templates according to claim 7, characterized in that, The slide block (402) is perpendicular to the side of the workpiece (1) to be clamped along the sliding direction of the guide groove; the pneumatic clamping component includes a clamping cylinder (403), and a top block is installed on the piston rod (502) of the clamping cylinder (403); a detachable extension top block (406) is installed at the front end of the top block, and at least two insertion holes are provided at the front end of the top block, and a pin is provided on the side of the extension top block (406) to be inserted into the insertion hole.

9. The universal clamping system for precision machining of press templates according to claim 8, characterized in that, The clamping direction of the clamping cylinder (403) is horizontal.

10. The universal clamping system for finishing press templates according to claim 7, characterized in that, The bottom surface of the fixture base plate (2) is rectangular. Corner mounting areas (202) are provided at the four corners of the fixture base plate (2). Length mounting areas (203) are provided between adjacent corner mounting areas (202) along the width direction. Several T-shaped fixing grooves parallel to the width direction of the fixture base plate (2) are provided at equal intervals within the corner mounting areas (202). Two to three grooves parallel to the length direction of the fixture base plate (2) are provided at equal intervals within the length mounting areas (203). The T-shaped fixing slots are parallel, and the cross-sectional dimensions of each T-shaped fixing slot are the same. The spacing between adjacent T-shaped fixing slots in the same installation area is equal. The base of the clamping module (4) is provided with two rows of fixing holes (407). The arrangement direction of each row of fixing holes (407) is parallel to the pneumatic clamping direction of the clamping cylinder (403). The spacing between the two rows of fixing holes (407) is equal to the spacing between adjacent T-shaped fixing slots. After the base is aligned with the T-shaped fixing slots at the corresponding installation positions, it is fixed by T-shaped blocks and bolts respectively.

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