High-efficiency milling machining composite clamp for die steel forming and forming process

Abstract

The present application relates to high efficiency milling composite fixture technical field, specifically, it relates to high efficiency milling machining composite fixture for die steel forming and forming process, including bridge plate for bearing and fixing various fixtures and several groups of positioning systems arranged in the bridge plate and the corresponding configuration of the clamping assembly with each group of positioning systems, the positioning system and the clamping assembly are connected through pipeline with the same gas source assembly outside, the gas source assembly has first passage and second passage.The present application determines the fixture axis by fixing the holder, the adjustable holder moves radially to adapt to different size fixtures, without manually tightening the bolt, the quick positioning and clamping of the fixture can be completed, the fixture replacement time is shortened.The clamping assembly locks the gear position before processing, which effectively prevents the displacement of the positioning mechanism caused by cutting vibration in the high-speed milling process.

Description

Technical Field

[0001] This invention relates to the field of high-efficiency milling composite fixture technology, and more specifically, to a high-efficiency milling composite fixture and forming process for mold steel forming. Background Technology

[0002] In the mold manufacturing industry, mold steel is the core material for manufacturing high-end molds such as automotive body panel molds, home appliance molds, and precision electronic molds. With the accelerating pace of product updates and the increasing complexity of mold structures, mold steel forming processes face comprehensive requirements for high precision, high efficiency, and high surface quality. Milling, as a crucial process in mold steel forming, directly determines the quality level of the mold.

[0003] Patent application CN202521339557.8 discloses a three-sided machining fixture for engine valve rocker arms. It includes an oil circuit board fixed to the A-axis fixture of a machining center. The oil circuit board is equipped with a center positioning component for positioning the center hole. The center positioning component, horizontal positioning component, and vertical positioning component are all driven by the hydraulic oil of the machining center. This allows for the simultaneous completion of multi-sided milling and drilling operations after clamping, thereby improving machining efficiency and ensuring the consistency of machined products.

[0004] Currently, the positioning holes and mounting holes on the bridge plate of the existing bridge plate fixture need to be pre-machined by turning and milling. Each time the fixture is changed, the bolts need to be tightened manually, which is cumbersome. Moreover, the existing bridge plate fixture lacks a quick positioning and clamping structure for the fixture body, which makes it impossible to quickly change different fixtures and reliably clamp them, making it difficult to meet the processing needs of multiple varieties and small batches.

[0005] In view of this, this application proposes a high-efficiency milling composite fixture and forming process for mold steel forming. Summary of the Invention

[0006] The purpose of this invention is to provide a high-efficiency milling composite fixture and forming process for mold steel forming. By using a fixed clamp to determine the fixture axis and an adjustable clamp to move radially to adapt to fixtures of different sizes, the invention solves the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A high-efficiency milling composite fixture for forming mold steel includes a bridge plate for supporting and fixing multiple fixtures, a number of positioning systems and clamping components configured corresponding to each positioning system, wherein the positioning system and clamping components are connected to the same external air source component through pipelines, and the air source component has a first passage and a second passage. The positioning system includes a clamp fixed inside the bridge plate for determining the center point of the clamp axis and several sets of clamps evenly distributed around the outside of the clamp in the circumferential direction; it also includes an adjustment mechanism for driving the clamps located on the outside to move radially along the surface of the bridge plate, and the clamps located on the outside are adjusted in position to adapt to different types of clamps. The clamp is a steel ball external support structure. When gas is introduced into the clamp through the first passage, the clamp releases the clamp. After the gas is cut off, the clamp automatically tightens the clamp. The clamping assembly includes tubes disposed on both sides of the gear and clamping blocks slidably sleeved on the ends of the tubes. When the air source assembly supplies air to the tubes through the second passage, the clamping blocks move upward to lock the gear.

[0008] In the technical solution of the present invention, the bridge plate includes a plate body and a cover plate fixedly connected to the bottom of the plate body by bolts. The top surface of the plate body is provided with a number of regularly distributed sliding grooves. The plate body is provided with a limiting groove on the outside of the sliding grooves. The outer wall of the plate body is provided with a through groove that communicates with the interior and is used to place the internal structure of the clamping component. The top surface of the plate body is provided with a through hole that communicates with the through groove. The positioning system and the clamping component are disposed between the plate body and the cover plate.

[0009] In the technical solution of the present invention, the adjustment mechanism includes a lead screw rotatably disposed inside the plate body, a toothed plate threadedly connected to the outside of the lead screw and slidably connected to the bottom surface of the plate body, and a gear meshing with the toothed plate. The gear has an arc-shaped groove sleeved on the outside of the clamp. The end of the clamp is slidably connected to the slide groove. When the lead screw rotates, it drives the toothed plate to move. The toothed plate drives the gear to rotate. The gear drives the clamp to move radially through the cooperation of the arc-shaped groove and the slide groove.

[0010] In the technical solution of the present invention, there are four clamps located on the outer side, which are evenly distributed circumferentially outside the middle clamp. The middle clamp is tightly fitted inside the plate, and the clamps located on the outer side are slidably connected to the corresponding arc-shaped groove.

[0011] In the technical solution of the present invention, the clamp includes a base, a positioning pin threaded to the outside of the base, a piston plate slidably disposed in the air chamber inside the base and the positioning pin, a valve core threaded to the top surface of the piston plate and slidably disposed inside the positioning pin, a plurality of steel balls slidably embedded in the outer wall of the positioning pin, a first spring sleeved on the outside of the valve core, a sealing plate tightly sleeved in the bottom opening of the base, and a limiting baffle tightly sleeved on the outer wall of the positioning pin and slidably disposed inside the limiting groove.

[0012] In the technical solution of the present invention, the positioning pin is slidably connected inside the slide groove and its top end extends above the top surface of the plate. The positioning pin has a stepped hole inside. The longitudinal section of the valve core is inverted T-shaped. The valve body of the valve core has an arc-shaped clearance groove near the top end.

[0013] In the technical solution of the present invention, the positioning system further includes a first air pipe, a branch pipe, and a sleeve sleeved on the outside of the branch pipe, all connected to an external air source assembly; a branch air nozzle is also threaded onto the outer wall of the base; the end of the first air pipe passes through a sealing plate and extends into the interior of the base to introduce gas into the interior of the middle clamp; one end of the branch pipe is tightly sleeved on the outside of the branch air nozzle of the middle clamp, and the other end is slidably sleeved inside the sleeve; the end of the sleeve is tightly sleeved on the outside of the branch air nozzle of the outer clamp, and the sleeve and the branch pipe are slidably sealed together; there are four branch air nozzles on the middle clamp, which are respectively connected to the branch air nozzles of the four outer clamps through the branch pipe and the sleeve.

[0014] In the technical solution of the present invention, the clamping assembly further includes a second air pipe connected to the external air source assembly and connected to the insertion tube, a slide rod threaded to the top surface of the clamping block and slidably connected to the through hole, and a second spring sleeved on the outside of the slide rod, wherein the two ends of the second spring respectively abut against the groove wall of the through groove and the top surface of the clamping block.

[0015] In the technical solution of the present invention, the clamping block is slidably disposed in the through groove of the bridge plate, and a sliding hole is provided on the clamping block. The insertion tube is tightly fitted inside the plate body, and the top end of the insertion tube is slidably sealed with the sliding hole.

[0016] On the other hand, the present invention also provides an efficient milling process for forming mold steel, comprising the following steps: S1. Fix both ends of the bridge plate to the main spindle end and the auxiliary spindle end of the machining center respectively, and drive the bridge plate to rotate by the main spindle end; S2. Select the corresponding fixture according to the type of workpiece to be processed, and drive the outer clamps to move radially through the adjustment mechanism in the positioning system so that the distribution position of each clamp is adapted to the installation size of the fixture. S3. Place the fixture on the bridge plate, so that the intermediate clamp and the axial positioning structure of the fixture cooperate to complete the axial positioning of the fixture. S4. Disconnect the air supply from the air source assembly to the positioning system. Each gripper will automatically switch to the clamping state and clamp and fix the fixture to the bridge plate. S5. Activate the clamping component to lock the adjustment mechanism in the current position; S6. Install the workpiece to be processed on the fixture, start the machining center, and drive the bridge plate to rotate from the spindle end to perform milling on the workpiece.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This high-efficiency milling composite fixture and forming process for mold steel forming uses a fixed clamp to determine the fixture axis and an adjustable clamp to move radially to adapt to different sizes of fixtures. The fixture can be quickly positioned and clamped without manually tightening bolts, thus shortening the fixture change time.

[0018] 2. The high-efficiency milling composite fixture and forming process for mold steel forming effectively prevents displacement of the positioning mechanism caused by cutting vibration during high-speed milling by locking the gear position before processing through the clamping component, thus ensuring processing accuracy and surface quality.

[0019] 3. The high-efficiency milling composite fixture and forming process for mold steel forming connects the two ends of the bridge plate to the main spindle end and the secondary spindle end. Driven by the main spindle, it can complete the milling of multiple surfaces of the workpiece in one clamping, reducing secondary clamping errors. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure assembly of the present invention; Figure 2 This is a schematic diagram of the structure in this invention; Figure 3 This is a schematic diagram showing the bottom split of the structure in this invention; Figure 4 This is a schematic diagram showing the structural breakdown of the bridge plate in this invention; Figure 5 For the present invention Figure 4 An enlarged schematic diagram of part A in the middle; Figure 6 This is a schematic diagram of the positioning system in this invention; Figure 7 This is a partial structural diagram of the positioning system in this invention; Figure 8 This is a cross-sectional schematic diagram of the clamp in this invention; Figure 9 This is a sectional side view of the clamp in this invention; Figure 10 This is a schematic diagram of the clamping component in the present invention; Figure 11 This is a partial structural diagram of the clamping component in this invention; Explanation of reference numerals in the attached figures: 100. Bridge plate; 110. Plate body; 111. Slide groove; 112. Limiting groove; 113. Through groove; 114. Through hole; 120. Cover plate; 200. Positioning system; 210. Lead screw; 220. Toothed plate; 230. Gear; 231. Arc groove; 240. Clamp; 241. Base; 2410. Branch nozzle; 242. Positioning pin; 243. Piston plate; 244. Valve core; 245. Steel ball; 246. First spring; 247. Sealing plate; 248. Limiting baffle; 250. First air pipe; 260. Branch pipe; 270. Sleeve; 300, Clamping assembly; 310, Second trachea; 320, Intubation tube; 330, Clamping block; 331, Sliding hole; 340, Second spring; 350, Sliding rod. Detailed Implementation

[0021] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] Please see Figures 1-5 As shown, this embodiment provides the following technical solution: A high-efficiency milling composite fixture for mold steel forming includes a bridge plate 100 for supporting and fixing multiple fixtures, several sets of positioning systems 200 disposed within the bridge plate 100, and clamping components 300 corresponding to each set of positioning systems 200. The bridge plate 100 is a long strip-shaped plate structure, with its two ends used for fixed connection to the spindle end and the counterspindle end of a machining center, respectively. The spindle end drives the rotation to achieve multi-face machining. Several sets of positioning systems 200 are provided on the bridge plate 100, and each set of positioning systems 200 is spaced apart along the length of the bridge plate 100. Each set of positioning systems 200 corresponds to a set of fixtures, such as a three-jaw chuck or a vise, thereby realizing composite machining of various types of workpieces.

[0023] It should be noted that the positioning system 200 and the clamping assembly 300 are connected to an external air source assembly via pipelines. The air source assembly has a first passage and a second passage. The air source assembly includes an air pump, an air tank, a first solenoid valve, a second solenoid valve, and a PLC controller. The outlet of the air pump is connected to the air tank, and the outlet of the air tank is connected to both the first and second passages. The first passage is equipped with a first solenoid valve; the second passage is equipped with a second solenoid valve. The PLC controller is electrically connected to both the first and second solenoid valves to control the switching between the first and second passages.

[0024] Furthermore, such as Figures 4-5As shown, the bridge plate 100 includes a plate body 110 and a cover plate 120 fixedly connected to the bottom of the plate body 110 by bolts. Several sets of regularly distributed sliding grooves 111 are opened through the top surface of the plate body 110. Limiting grooves 112 are opened on the outside of the sliding grooves 111 of the plate body 110. A through groove 113 is opened on the outer wall of the plate body 110, which is connected to the interior and is used to place the internal structure of the clamping assembly 300. A through hole 114 is opened on the top surface of the plate body 110, which is connected to the through groove 113. The positioning system 200 and the clamping assembly 300 are disposed between the plate body 110 and the cover plate 120.

[0025] Please see Figures 6-9 As shown, in this embodiment, the positioning system 200 includes a clamp 240 fixed inside the bridge plate 100 for determining the center point of the clamp axis, and a plurality of clamps 240 evenly distributed around the outside of the clamp 240 in the circumferential direction; it also includes an adjustment mechanism for driving the clamps 240 located on the outside to move radially along the surface of the bridge plate 100, and the clamps 240 located on the outside are adjusted in position to adapt to different types of clamps. The adjustment mechanism includes a lead screw 210 rotatably disposed inside the plate 110, a toothed plate 220 threadedly connected to the outside of the lead screw 210 and slidably connected to the bottom surface of the plate 110, and a gear 230 meshing with the toothed plate 220. The gear 230 has an arc-shaped groove 231 sleeved on the outside of the clamp 240. The end of the clamp 240 is slidably connected to the slide groove 111. When the lead screw 210 rotates, it drives the toothed plate 220 to move. The toothed plate 220 drives the gear 230 to rotate. The gear 230 drives the clamp 240 to move radially through the engagement of the arc-shaped groove 231 and the slide groove 111, thereby adapting to clamps of different sizes.

[0026] Furthermore, the rotation of the lead screw 210 can be achieved through manual operation or servo motor drive to meet the needs of rapid switching of different specifications of fixtures; the position adjustment range of the outer gripper 240 matches the stroke of the arc groove 231, which can be adapted to the installation size of a variety of standard fixtures.

[0027] like Figures 8-9 The gripper 240 has a ball-bearing external support structure. When gas is introduced into the gripper 240 through the first passage, the gripper 240 releases the clamp. After the gas is cut off, the gripper 240 automatically clamps the clamp. There are four grippers 240 on the outer side, evenly distributed circumferentially outside the middle gripper 240. The middle gripper 240 is tightly fitted inside the plate 110, and the outer grippers 240 are slidably connected to the corresponding arc-shaped groove 231. The middle gripper 240 serves as the axis reference, ensuring that its axis position is consistent each time the clamp is installed, thereby improving the repeatability and positioning accuracy and achieving anti-rotation positioning of the clamp.

[0028] Specifically, the clamp 240 includes a base 241, a positioning pin 242 threaded to the outside of the base 241, a piston plate 243 slidably disposed in the air chambers inside the base 241 and the positioning pin 242, a valve core 244 threaded to the top surface of the piston plate 243 and slidably disposed inside the positioning pin 242, a plurality of steel balls 245 slidably embedded in the outer wall of the positioning pin 242, a first spring 246 sleeved on the outside of the valve core 244, a sealing plate 247 tightly sleeved in the bottom opening of the base 241, and a limiting baffle 248 tightly sleeved in the outer wall of the positioning pin 242 and slidably disposed inside the limiting groove 112.

[0029] Furthermore, the positioning pin 242 is slidably connected inside the slide groove 111 and its top end extends above the top surface of the plate 110. The positioning pin 242 has a stepped hole inside. The longitudinal section of the valve core 244 is inverted T-shaped. The valve body of the valve core 244 has an arc-shaped clearance groove near the top end. After the gas passes through the first passage and the sealing plate 247 into the internal air chamber of the base 241 and the positioning pin 242, it drives the piston plate 243 and the valve core 244 to move upward. When the bottom end of the valve core 244 is limited by the stepped surface of the stepped hole inside the positioning pin 242, the arc-shaped relief groove of the valve core 244 moves upward to the area where the steel ball 245 is located. The steel ball 245 retracts radially inward into the relief groove to release the clamp. After the gas is disconnected, the first spring 246 pushes the piston plate 243 and the valve core 244 to reset. The outer wall of the valve body of the valve core 244 pushes the steel ball 245 outward again, squeezing the steel ball 245 to extend radially outward to hold the clamp.

[0030] It should be noted that, as Figure 9 As shown, at this time, the gas is introduced into the air chamber inside the base 241 and the positioning pin 242. The elastic force of the first spring 246 pushes the piston plate 243 to abut against the annular convex surface of the inner wall of the base 241. At this time, the valve core 244 pushes the steel ball 245 outward. A branch air nozzle 2410 is also threaded on the outer wall of the base 241, and the air passage in the branch air nozzle 2410 is connected to the annular convex surface of the inner wall of the base 241.

[0031] Furthermore, such as Figure 7As shown, the positioning system 200 also includes a first air pipe 250, a branch pipe 260, and a sleeve 270 connected to an external air source assembly; the end of the first air pipe 250 passes through the sealing plate 247 and extends into the base 241 to allow gas to enter the interior of the intermediate clamp 240; one end of the branch pipe 260 is tightly fitted to the outside of the branch air nozzle 2410 of the intermediate clamp 240, and the other end is slidably fitted inside the sleeve 270; the sleeve 270... The end is tightly fitted to the outside of the branch nozzle 2410 of the outer clamp 240, and the sleeve 270 and the branch pipe 260 are in sliding sealing fit; there are four branch nozzles 2410 on the middle clamp 240, which are respectively connected to the branch nozzles 2410 of the four outer clamps 240 through the branch pipe 260 and the sleeve 270. The transverse cross section of the branch pipe 260 and the sleeve 270 are both L-shaped, and the inner diameter of the sleeve 270 is adapted to the outer diameter of the branch pipe 260.

[0032] Please see Figures 6-11 As shown, in this embodiment, the clamping assembly 300 includes an insertion tube 320 disposed on both sides of the gear 230, a second air pipe 310 connected to both the external air source assembly and the insertion tube 320, a clamping block 330 slidably sleeved on the end of the insertion tube 320, a slide rod 350 threadedly connected to the top surface of the clamping block 330 and slidably connected to the through hole 114, and a second spring 340 sleeved on the outside of the slide rod 350. When the air source assembly supplies air to the insertion tube 320 through the second passage, the clamping block 330 moves upward to lock the gear 230. The two ends of the second spring 340 respectively abut against the groove wall of the through groove 113 and the top surface of the clamping block 330.

[0033] Furthermore, the clamping block 330 is slidably disposed in the through groove 113 of the bridge plate 100. The clamping block 330 is provided with a sliding hole 331. The insertion tube 320 is tightly fitted inside the plate 110. The top end of the insertion tube 320 is slidably sealed with the sliding hole 331. The working principle of the clamping assembly 300 is as follows: after the gas passes through the second gas pipe 310 and the insertion tube 320 into the sliding hole 331, it pushes the clamping block 330 to move upward and presses the gear 230 to lock the position of the gear 230. After the gas is disconnected, the second spring 340 drives the clamping block 330 to move downward and reset to release the lock on the gear 230.

[0034] The high-efficiency milling process for forming mold steel according to the present invention includes the following steps: S1. Fix the two ends of the bridge plate 100 to the main spindle end and the auxiliary spindle end of the machining center respectively, and drive the bridge plate 100 to rotate by the main spindle end; the main spindle end provides rotational power, and the auxiliary spindle end provides driven support; after the bridge plate 100 is installed, it needs to be aligned to ensure that the upper surface of the bridge plate 100 is parallel to the main spindle axis to ensure the accuracy of subsequent clamping and machining. S2. Select the corresponding fixture according to the type of workpiece to be processed. Drive the outer clamp 240 to move radially through the adjustment mechanism in the positioning system 200 so that the distribution position of each clamp 240 is adapted to the installation size of the fixture. Specifically, the operator selects the corresponding fixture according to the type of workpiece and rotates the lead screw 210. The lead screw 210 drives the toothed plate 220 to move axially. The toothed plate 220 drives the gear 230 to rotate. The gear 230 drives the four outer clamps 240 to move radially synchronously along the slide groove 111 through the cooperation of the arc groove 231 and the slide groove 111 so that the distribution position of each clamp 240 is adapted to the size of the mounting hole or positioning groove at the bottom of the fixture. S3. Place the fixture on the bridge plate 100, so that the intermediate clamp and the axial positioning structure of the fixture are engaged. Align the center positioning hole at the bottom of the fixture with the top of the positioning pin 242 of the intermediate clamp 240 and insert it to complete the axial positioning of the fixture. S4. Disconnect the air supply from the air source assembly to the positioning system 200. Each gripper 240 automatically switches to the clamping state, clamping and fixing the fixture onto the bridge plate 100. Specifically, the PLC controller controls the first solenoid valve to close, cutting off the gas supply to the first passage. The first spring 246 inside each gripper 240 pushes the piston plate 243 and valve core 244 to reset. The outer wall of the valve core 244 pushes the steel ball 245 outward again, squeezing the steel ball 245 to extend radially outward. The steel ball 245 extends out of the outer wall of the positioning pin 242 and abuts tightly against the wall of the positioning hole or positioning groove at the bottom of the fixture, thereby achieving synchronous clamping and fixing of the fixture. S5. Start the clamping assembly 300 and lock the adjustment mechanism in the current position. Specifically, the PLC controller controls the second solenoid valve to open, and gas enters the sliding hole 331 of the clamping block 330 through the second passage, the second air pipe 310 and the insertion tube 320, pushing the clamping block 330 to move upward against the elastic force of the second spring 340. The upper end face of the clamping block 330 abuts against the lower end face of the gear 230 and presses the gear 230, using friction to lock the gear 230 in the current position. After the gear 230 is locked, the toothed plate 220 meshing with the gear 230 and the lead screw 210 connected to it are also locked. The position of the entire adjustment mechanism is fixed, effectively preventing the radial displacement of the clamp 240 caused by cutting vibration during high-speed milling, and ensuring the stability of the clamp position during processing. S6. Mount the mold steel workpiece to be processed onto the fixture, start the machining center, and drive the bridge plate 100 to rotate from the spindle end to perform milling on the workpiece; specifically, the operator mounts and clamps the mold steel workpiece to be processed onto the fixture; starts the machining center, and drives the bridge plate 100 to rotate to a preset angle, coordinating with the movement of the machining center's cutting tool to complete the milling of multiple surfaces of the workpiece in one clamping; during the processing, the clamping assembly 300 continuously maintains the lock on the gear 230 to ensure the stability of the position of the positioning system 200; S7. In the roughing stage, use a carbide face milling cutter with a large feed to remove the black skin, leaving a finishing allowance of 0.5-1.0mm. Control the depth of cut and feed rate to avoid work hardening and thermal deformation. In the finishing stage, use a precision surface grinder to grind the reference surface. Use a grinding wheel with a single feed rate ≤0.02mm, flatness ≤0.02mm / 1000mm, and surface roughness Ra≤0.8μm. For deep hole structures such as cooling water holes and ejector pin holes in the mold, with a length-to-diameter ratio >10, deep hole machining is performed after rough and finish milling and before heat treatment. Drilling is performed using a staged feed and high-pressure internal cooling chip removal process, with a coolant pressure of 2-5 MPa, ensuring hole straightness ≤0.1 mm / m and hole diameter tolerance controlled within H7-H8 grade; finishing of complex structures such as cavities and cores is completed on a CNC machining center, using coated carbide ball end mills for curved surface contour milling, with a spindle speed of 3000-8000 r / min, a feed rate of 500-1500 mm / min, and a final dimensional accuracy of ±0.005-0.02 mm, with a surface roughness Ra≤0.8 μm for key mating surfaces; S8. After the rough machining stage is completed, the workpiece is removed from the fixture and then subjected to vacuum heat treatment, including segmented preheating (300℃ low temperature preheating for 1 hour + 600-650℃ secondary preheating for 1 hour), austenitizing quenching (1020-1050℃, holding coefficient 1.5min / mm) and 2-3 temperings (560-600℃, each holding for 2-4 hours) to stabilize the hardness at the target value (HRC 46-52). S9. After heat treatment, the reference surface is re-ground, and the key mating holes are honed or precision ground to remove the heat treatment oxide layer and micro-deformation. During the processing, online inspection or offline coordinate measuring machine is used to verify the dimensions between processes. Before leaving the factory, full-size coordinate measuring machine inspection, hardness test and surface flaw detection are carried out to ensure that all product indicators meet the drawing requirements.

[0035] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A high-efficiency milling composite fixture for forming mold steel, characterized in that: It includes a bridge plate for supporting and fixing various clamps, and several sets of positioning systems and clamping components configured corresponding to each set of positioning systems. The positioning system and clamping components are connected to the same external air source component through pipes. The air source component has a first passage and a second passage. The positioning system includes a clamp fixed inside the bridge plate for determining the center point of the clamp axis and several sets of clamps evenly distributed around the outside of the clamp in the circumferential direction; it also includes an adjustment mechanism for driving the clamps located on the outside to move radially along the surface of the bridge plate, and the clamps located on the outside are adjusted in position to adapt to different types of clamps. The clamp is a steel ball external support structure. When gas is introduced into the clamp through the first passage, the clamp releases the clamp. After the gas is cut off, the clamp automatically tightens the clamp. The clamping assembly includes tubes disposed on both sides of the gear and clamping blocks slidably sleeved on the ends of the tubes. When the air source assembly supplies air to the tubes through the second passage, the clamping blocks move upward to lock the gear.

2. The high-efficiency milling composite fixture for mold steel forming according to claim 1, characterized in that: The bridge plate includes a plate body and a cover plate fixed to the bottom of the plate body by bolts. The top surface of the plate body has several sets of regularly distributed sliding grooves. The plate body has a limiting groove on the outside of the sliding grooves. The outer wall of the plate body has a through groove that communicates with the interior and is used to place the internal structure of the clamping component. The top surface of the plate body has a through hole that communicates with the through groove. The positioning system and the clamping component are disposed between the plate body and the cover plate.

3. The high-efficiency milling composite fixture for forming mold steel according to claim 2, characterized in that: The adjustment mechanism includes a lead screw rotatably disposed inside the plate body, a toothed plate threadedly connected to the outside of the lead screw and slidably connected to the bottom surface of the plate body, and a gear meshing with the toothed plate. The gear has an arc-shaped groove sleeved on the outside of the clamp. The end of the clamp is slidably connected to the slide groove. When the lead screw rotates, it drives the toothed plate to move. The toothed plate drives the gear to rotate. The gear drives the clamp to move radially through the cooperation of the arc-shaped groove and the slide groove.

4. The high-efficiency milling composite fixture for forming mold steel according to claim 3, characterized in that: There are four clamps on the outer side, which are evenly distributed circumferentially outside the middle clamp. The middle clamp is tightly fitted inside the plate, and the outer clamps are slidably connected to the corresponding arc-shaped grooves.

5. The high-efficiency milling composite fixture for forming mold steel according to claim 4, characterized in that: The clamp includes a base, a positioning pin threaded to the outside of the base, a piston plate slidably disposed in the air chamber inside the base and the positioning pin, a valve core threaded to the top surface of the piston plate and slidably connected to the inside of the positioning pin, a number of steel balls slidably embedded in the outer wall of the positioning pin, a first spring sleeved on the outside of the valve core, a sealing plate tightly sleeved in the bottom opening of the base, and a limiting baffle tightly sleeved on the outer wall of the positioning pin and slidably connected to the inside of the limiting groove.

6. The high-efficiency milling composite fixture for forming mold steel according to claim 5, characterized in that: The positioning pin is slidably connected inside the groove and its top extends above the top surface of the plate. The positioning pin has a stepped hole inside. The longitudinal section of the valve core is inverted T-shaped. The valve body of the valve core has an arc-shaped clearance groove near the top.

7. The high-efficiency milling composite fixture for forming mold steel according to claim 6, characterized in that: The positioning system also includes a first air pipe, a branch pipe, and a sleeve fitted over the outside of the branch pipe, all connected to an external air source assembly. A branch nozzle is threaded onto the outer wall of the base. The end of the first air pipe passes through a sealing plate and extends into the base to allow gas to pass into the middle clamp. One end of the branch pipe is tightly fitted over the outside of the branch nozzle of the middle clamp, and the other end is slidably fitted over the inside of the sleeve. The end of the sleeve is tightly fitted over the outside of the branch nozzle of the outer clamp, and the sleeve and branch pipe are slidably sealed together. There are four branch nozzles on the middle clamp, each corresponding to a branch nozzle of one of the four outer clamps via the branch pipe and sleeve.

8. The high-efficiency milling composite fixture for forming mold steel according to claim 7, characterized in that: The clamping assembly also includes a second air pipe connected to the external air source assembly and the insertion tube, a slide rod threaded to the top surface of the clamping block and slidably connected to the through hole, and a second spring sleeved on the outside of the slide rod. The two ends of the second spring abut against the groove wall of the through groove and the top surface of the clamping block, respectively.

9. The high-efficiency milling composite fixture for forming mold steel according to claim 8, characterized in that: The clamping block is slidably disposed in the through groove of the bridge plate, and a sliding hole is provided on the clamping block. The insertion tube is tightly fitted inside the plate body, and the top end of the insertion tube is slidably sealed with the sliding hole.

10. A high-efficiency milling forming process for mold steel forming, using the high-efficiency milling composite fixture for mold steel forming as described in claim 9, characterized in that... Includes the following steps: S1. Fix both ends of the bridge plate to the main spindle end and the auxiliary spindle end of the machining center respectively, and drive the bridge plate to rotate by the main spindle end; S2. Select the corresponding fixture according to the type of workpiece to be processed, and drive the outer clamps to move radially through the adjustment mechanism in the positioning system so that the distribution position of each clamp is adapted to the installation size of the fixture. S3. Place the fixture on the bridge plate, so that the intermediate clamp and the axial positioning structure of the fixture cooperate to complete the axial positioning of the fixture. S4. Disconnect the air supply from the air source assembly to the positioning system. Each gripper will automatically switch to the clamping state and clamp and fix the fixture to the bridge plate. S5. Activate the clamping component to lock the adjustment mechanism in the current position; S6. Install the workpiece to be processed on the fixture, start the machining center, and drive the bridge plate to rotate from the spindle end to perform milling on the workpiece.

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