An automated tooling system and method for machining hollowed-out beveled skeleton parts.

Abstract

This invention discloses an automated tooling system and its working method for machining skeleton parts with hollowed-out oblique cut surfaces. The system includes a hydraulic module, several indexing and clamping cylinders, several hydraulic floating supports, two zero-point positioning mechanisms, and a tooling base plate. It features rapid positioning and adaptive clamping of the cast blank of the hollowed-out oblique cut skeleton part, and supports and reinforces the weak-stiffness rib structure on the part. Furthermore, by combining the machining process sequence of the weak-stiffness rib structure, the system uses the hydraulically driven opening and closing action of the clamping module to achieve support and reinforcement during machining of the weak-stiffness rib structure. This solves the problems of elastic deformation and machining chatter of the weak-stiffness ribs during machining of this type of part. It allows for rapid switching between different machining steps, improving the clamping efficiency of the part and achieving efficient and precise machining of this type of hollowed-out oblique cut skeleton part.

Description

Technical Field

[0001] An automated tooling system and its working method for machining hollowed-out oblique-cut skeleton parts belong to the field of mechanical engineering. Background Technology

[0002] Skeleton parts with openwork beveled surfaces are typical difficult-to-machine weakly rigid structural components in mechanical engineering. One type of openwork beveled surface skeleton part has two beveled surfaces and is composed of numerous suspended ribs that enclose a large number of openwork areas. Due to the large tolerance range of the cast blank, positioning and clamping are difficult. During machining, the suspended ribs undergo elastic deformation under the cutting force of the tool, causing tool damage and destroying the machined surface, thus making it difficult to guarantee machining accuracy and efficiency.

[0003] Currently, the machining of skeleton structures for hollowed-out beveled surface skeleton parts typically uses general-purpose fixtures (such as trapezoidal pressure plates and shims) and manual adjustments. Due to the large tolerance range of the cast blank and its non-parallel surface to the worktable, shims and matching machined shims are needed to ensure reliable clamping, securing, and alignment of the cast blank. This results in excessively long production preparation time, high labor intensity, and difficulty in guaranteeing clamping accuracy. To avoid elastic deformation during the machining of suspended rib structures, which could damage the tool and the machined surface, plaster filling is used to reinforce this weakly rigid structure. However, the cured plaster is removed by the tool during cutting and is also destroyed by the cutting fluid jet, failing to effectively reinforce the structure. Therefore, the machining accuracy of the parts is difficult to guarantee, and the machining efficiency is low. While many existing tooling patents address skeleton parts, few cover skeleton wedge parts with hollowed-out beveled surfaces, and these patents do not provide rapid clamping and loosening for specific machining steps. Chinese Invention Patent: A machining fixture for a large thin-walled semi-open cabin frame made of titanium alloy (Application No.: 201810072150.1). The main feature of this invention is that it can position and stabilize the two end faces of the cabin frame through irregularly shaped pressure plates and circular pressure plates. The overall machining fixture can achieve all-round support and positioning of the cabin frame's interior. However, this fixture is only for specific cabin frames and does not cover hollowed-out oblique-cut frame parts. It also does not achieve adaptive clamping for parts, which has certain limitations. Chinese Invention Patent: A machining fixture for the rear bumper frame of a self-balancing scooter (Application No.: 202020461903.0). This utility model has two first stations and two second stations on the main fixture board, and connects pneumatic components and pressure plates. The four-station machining design can improve the space utilization of the machine tool, reduce the number of tool changes, and greatly improve the production efficiency of machining. However, it cannot achieve adaptive clamping and toolpath avoidance for hollowed-out oblique-cut frame parts. European Invention Patent: TOOLING SYSTEM AND METHODS OF The invention, ASSEMBLING AND DISASSEMBLING AROOTARY ASSEMBLY THEREWITH (application number: EP23173738A), is characterized by using hydraulic tooling and push and pull members extending along the length to assemble or disassemble parts on the internal shaft of an aero-engine. It can adapt to different parts by replacing adapters. The invention can adapt to the diversity of parts, but it cannot achieve automated matching of adapters or adaptive clamping for parts.

[0004] To achieve efficient and precise machining of hollowed-out oblique-cut skeleton parts with weak stiffness structures, this invention provides an automated tooling system and its working method for machining hollowed-out oblique-cut skeleton parts. Summary of the Invention

[0005] To address the existing technical problems, this invention discloses an automated tooling system and its working method for machining skeleton parts with hollowed-out oblique cut surfaces. By utilizing the flexible support characteristics of the tooling, the clamping force and support force achieve a follow-up effect, thereby reducing machining deformation and improving machining efficiency.

[0006] To address the aforementioned technical deficiencies, the present invention adopts the following technical solution:

[0007] An automated tooling system for machining hollowed-out oblique-cut skeleton parts includes a tooling base plate, which is fixed to the machine tool worktable. The tooling base plate is equipped with a hydraulic module, several indexing and clamping cylinders, several hydraulic floating supports, and a zero-point positioning mechanism. The hydraulic module is connected to the indexing and clamping cylinders, hydraulic floating supports, and zero-point positioning mechanism through hydraulic oil pipes to provide hydraulic power and control the cylinder movement.

[0008] The zero-point positioning mechanism is located at the two positioning holes of the part and cooperates with the positioning holes of the part for quick alignment;

[0009] The indexing clamping cylinders are located at the process bosses and the hollowed-out areas formed by the ribs of the part, respectively. The upper piston rod is equipped with a pressure plate to adaptively clamp the process bosses, the beveled surfaces and the ribs of the part. The piston of the cylinder can rotate to avoid the toolpath when machining the side wall of the part. The indexing clamping cylinder has two interfaces for controlling the clamping action of the indexing clamping cylinder and the rotation action of the cylinder piston.

[0010] The hydraulic floating support, located at the bottom of the part, provides adaptive support to compensate for the non-horizontal state of the cut surface of the machined part and the vibration and positional deviation generated during the machining of the loaded part; the hydraulic floating support contains two interfaces for controlling the piston action;

[0011] The hydraulic module includes several three-position four-way solenoid directional valves. The two interfaces of the indexing clamping cylinder and the hydraulic floating support are connected to the A1 and A2 interfaces of the three-position four-way solenoid directional valves. The three-position four-way solenoid directional valves are electrically connected to the PLC program to control the working conditions of the indexing clamping cylinder and the hydraulic floating support, so as to realize clamping and toolpath avoidance at different steps.

[0012] Preferably, the A1 port of the three-position four-way solenoid directional valve is connected to the oil inlet pipe of the oil cylinder, and the A2 port is connected to the oil return pipe of the oil cylinder, so as to output the pressure of the oil cylinder to the part and realize the self-adaptive fixing of the part.

[0013] Preferably, the A3 port of the three-position four-way solenoid directional valve is connected to the outlet pipe of the first check valve, and the inlet pipe of the first check valve is connected to the accumulator.

[0014] Preferably, the hydraulic module further includes several three-position two-way solenoid directional valves, several two-position two-way solenoid directional valves, several pressure sensors, several pressure gauges, and several check valves. The B1 port of the three-position two-way solenoid directional valve, the pressure gauge, the pressure sensor, and the inlet of the second check valve are connected in sequence. The outlet of the second check valve is connected to the accumulator and the inlet pipe of the first check valve, respectively. The B2 port and B3 port of the three-position two-way solenoid directional valve are both connected to the oil tank.

[0015] Preferably, the oil tank is connected in sequence to the inlet of the hydraulic pump and the inlet of the third check valve, and the outlet of the third check valve is connected to the B2 port of the three-position two-way solenoid directional valve; the oil tank is connected in sequence to the inlet of the pressure relief valve and the inlet of the third check valve, and the outlet of the third check valve is connected to the B2 port of the three-position two-way solenoid directional valve; the B3 port of the three-position two-way solenoid directional valve is connected in sequence to the inlet of the two-position two-way solenoid directional valve and the inlet of the fourth check valve, and the outlet of the fourth check valve is connected to the oil tank.

[0016] Preferably, the PLC outputs control signals to the three-position four-way solenoid directional valve, the three-position two-way solenoid directional valve, and the two-position two-way solenoid directional valve to switch the connection mode of the internal ports of the directional valves and to fix or release the oil cylinder.

[0017] Preferably, when adaptively clamping the workpiece, the hydraulic floating support and the hydraulic indexing clamping cylinder are fixed. The PLC program outputs a control signal to the three-position two-way solenoid valve, connecting the B1 and B2 interfaces of the three-position two-way solenoid valve. The hydraulic oil from the hydraulic module flows into the accumulator through the second check valve. When the pressure gauge measures that the accumulator pressure reaches the preset value, the PLC program outputs a control signal to open the first check valve. At the same time, it controls the three-position four-way solenoid valve to connect the A1 and A3 interfaces and the A2 and A4 interfaces, so that the accumulator transfers the hydraulic oil to the cylinder inlet chamber. The hydraulic floating support lifts the supporting parts, and the indexing clamping cylinder presses the parts down, realizing adaptive clamping of the workpiece.

[0018] Preferably, when the workpiece is adaptively clamped, the hydraulic floating support and the hydraulic indexing clamping cylinder are released. The PLC program outputs a control signal to the three-position two-way solenoid directional valve, connecting the B1 and B2 interfaces of the three-position two-way solenoid directional valve. At the same time, the PLC program outputs a control signal to open the second check valve and close the first check valve, so that the hydraulic oil of the hydraulic module flows into the accumulator through the three-position two-way solenoid directional valve, pressure gauge, pressure sensor, and check valve. When the accumulator pressure reaches the preset value, the first check valve is opened, and the A1 and A4 interfaces of the three-position four-way solenoid directional valve and the A2 and A3 interfaces are connected, so that the accumulator transfers the hydraulic oil back to the oil tank, driving the cylinder to release the part.

[0019] This invention also discloses a working method for an automated tooling system for machining skeleton parts with hollowed-out beveled surfaces, the specific steps of which are as follows:

[0020] 1) The part to be machined is placed on the tooling base plate and positioned by the zero positioning mechanism and the part positioning hole;

[0021] 2) The hydraulic module is controlled by a PLC program to fix the parts;

[0022] 3) Roughly machine surface A of part, and after completion, use PLC program to control the hydraulic module to release pressure and relieve the machining stress of part;

[0023] 4) Repeat the above steps to complete the roughing of surface B, the finishing of surface A, and the finishing of surface B;

[0024] 5) The indexing and clamping cylinders around the hollow area formed by the ribs of the moving parts perform side wall machining of the corresponding hollow area, while the other indexing and clamping cylinders are released to avoid tool movement.

[0025] 6) Control the hydraulic module to release the C-surface indexing and clamping cylinder to perform C-surface machining and cavity machining;

[0026] 7) Control the hydraulic module to clamp the C-side indexing clamping cylinder, release the D-side indexing clamping cylinder, and perform D-side machining.

[0027] The technical effects achieved by this invention are as follows:

[0028] 1. By utilizing the hydraulic floating characteristics of several hydraulic floating supports and indexing clamping cylinders, the following control of the holding force of skeleton part blanks with hollowed-out oblique cut surfaces is realized, and reliable adaptive clamping of part casting blanks with millimeter-level tolerance floating is achieved.

[0029] 2. By automating the action sequence of each hydraulic clamping module and processing the suspended ribs in batches, the elastic deformation and chatter problems of hollow structures and beveled surfaces during the part processing are prevented, thus achieving precision machining of weak rigid structures and improving the efficiency of part processing. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the hydraulic module's oil inlet and return passages and the tooling system structure.

[0031] Figure 2 A schematic diagram of the overall structure of the tooling used for machining skeleton parts with openwork beveled surfaces;

[0032] Figure 3 This is a schematic diagram showing the distribution of tooling used for machining surface A of part;

[0033] Figure 4 This is a schematic diagram showing the distribution of tooling used for machining side B of the part;

[0034] Figure 5 This is a schematic diagram showing the distribution of tooling used for machining surface C of the part;

[0035] Figure 6 This is a schematic diagram showing the distribution of tooling used for machining surface D of the part;

[0036] Figure 7 This is a hydraulic schematic diagram of the hydraulic module driving the hydraulic floating support (left) and the indexing clamping cylinder (right).

[0037] Figure label:

[0038] Figure 1 In the middle: 1-tool base plate, 2-first indexing clamping cylinder, 3-hydraulic floating support, 4-pressure plate, 5-second indexing clamping cylinder, 6-zero point positioning mechanism, 7-pressure plate.

[0039] Figure 7 In the middle: 8-Filter, 9-Hydraulic pump, 10-Pressure relief valve, 11-Third check valve, 12-Three-position two-way solenoid directional valve, 13-Second check valve, 14-Accumulator, 15-First check valve, 16-Three-position four-way solenoid directional valve, 17-Hydraulic floating support cylinder, 18-Inverter clamping cylinder assembly, 19-Two-position two-way solenoid directional valve, 20-Fourth check valve. Detailed Implementation

[0040] The present invention and its embodiments are described below. This description is not restrictive, and actual embodiments are not limited thereto. In short, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention. In the accompanying drawings, components are enlarged for clarity.

[0041] To enhance understanding of the present invention, the automated tooling system for machining skeleton parts with hollowed-out oblique cut surfaces and its working method will be further described in detail below with reference to examples and accompanying drawings. These examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0042] The technical solution of this invention is an automated tooling system for machining skeleton parts with hollowed-out oblique cut surfaces, comprising: a hydraulic module, several indexing clamping cylinders, several hydraulic floating supports, two zero-point positioning mechanisms, and a tooling base plate. The tooling base plate is fixed to the machine tool worktable, and the hydraulic module, indexing clamping cylinders, and hydraulic floating supports are mounted on the tooling base plate. The hydraulic module is connected to the indexing clamping cylinders, hydraulic floating supports, and zero-point positioning mechanisms respectively, providing hydraulic power and controlling the cylinder movements. The indexing clamping cylinders are used for adaptive clamping and releasing of the parts; the cylinder piston is rotatable, allowing avoidance of toolpaths during machining of the part's sidewalls. The two zero-point positioning mechanisms are located at the two positioning holes of the part, cooperating with the part's positioning holes for quick alignment and positioning of the part. The hydraulic floating supports achieve a follow-up effect on the cutting force, providing adaptive support during machining; the indexing clamping cylinders achieve adaptive clamping, avoiding toolpaths during sidewall machining.

[0043] The specific component installation layout is as follows: Figures 1 to 2 As shown: a tooling base plate 1, a zero-point positioning mechanism 6 fixed to the top surface of the tooling base plate 1 by bolts, a hydraulic floating support 3 installed on the corresponding hole positions of the tooling base plate 1, and indexing clamping cylinders 2 and 5 installed on the corresponding hole positions of the tooling base plate 1.

[0044] The indexing clamping cylinder includes a first indexing clamping cylinder 2, located at the process boss, which is positioned and supported by a pressure plate 7 mounted on its upper first piston rod, used for adaptive clamping of the process boss on the part; and a second indexing clamping cylinder 5, located around the ribs on the part, which is positioned and supported by a pressure plate 4 mounted on its upper second piston rod, used for adaptive clamping of the beveled surface and the ribs. The indexing clamping cylinder realizes the follow-up function of the cutting force, used for adaptive clamping and releasing of the part, and the cylinder piston can rotate, avoiding the toolpath when machining the side wall of the part. The indexing clamping cylinder includes two interfaces for controlling the clamping action of the indexing clamping cylinder and the rotation action of the cylinder piston.

[0045] The hydraulic floating support 3 is located at the bottom of the part and supports the bottom of the part via pads 6. It provides self-adjustable support during machining operations, compensating for the non-horizontal state of the cut surface of the machined part, as well as vibrations and positional deviations generated when machining loaded parts. The hydraulic floating support 3 includes two interfaces for controlling piston movement.

[0046] The hydraulic module includes several three-position four-way solenoid directional valves 16, several three-position two-way solenoid directional valves 12, several accumulators 14, several pressure control sensors, several pressure gauges, several check valves, and several hydraulic oil pipes. The cylinders are indexing clamping cylinder components 18 and hydraulic floating support cylinders 17.

[0047] The four ports of the three-position four-way solenoid directional valve are A1, A2, A3, and A4 in sequence. When the valve core is in the left position, A1 and A3 are connected and A2 and A4 are connected. When the valve core is in the right position, ports A1 and A4 are connected and ports A2 and A3 are connected. When the valve core is in the middle position, A1, A2, A3, and A4 are not connected to each other.

[0048] Both ports of the indexing clamping cylinder and the hydraulic floating support cylinder are connected to ports A1 and A2 of the three-position four-way solenoid directional valve of the hydraulic module. Port A1 is connected to the inlet oil chamber of the cylinder, and port A2 is connected to the return oil chamber of the cylinder, used to output the pressure of the cylinder to the workpiece, achieving self-adaptive fixation of the workpiece. Port A3 of the three-position four-way solenoid directional valve 16 is connected to the outlet pipe of the first check valve 15, and the inlet pipe of the first check valve 15 is connected to the accumulator 14. Port A4 is connected to the inlet pipe of the two-position two-way solenoid directional valve 19. The three-position four-way solenoid directional valve 16 can control the working conditions of the indexing clamping cylinder and the hydraulic floating support through a PLC program, realizing rapid clamping and toolpath avoidance at different steps.

[0049] The three-position two-way solenoid directional valve has three ports: B1, B2, and B3. The valve core position can be controlled to connect ports B1 and B2, connect ports B1 and B3, or disconnect all ports. Port B1 of the three-position two-way solenoid directional valve 12 is sequentially connected to the pressure gauge, pressure sensor, and inlet of the second check valve 13. The outlet of the second check valve 13 is connected to the inlet pipe of the accumulator 14. Port B2 of the three-position two-way solenoid directional valve 12 is connected to the outlet of the third check valve 11. The inlet of the third check valve 11 is connected to the outlet of the hydraulic pump 9 and the inlet of the pressure relief valve 10. Port B3 of the three-position two-way solenoid directional valve 12 is sequentially connected to the inlet of the two-position two-way solenoid directional valve 12 and the fourth check valve 20. The three-position two-way solenoid directional valve 12 is controlled by a PLC program to realize the oil supply operation during fixed actions and the pressure relief operation to the accumulator. The two-position two-way solenoid directional valve 12 is controlled by a PLC program to realize the oil discharge operation when not in operation.

[0050] like Figure 1 , Figure 7 As shown, the oil inlet circuit of the tooling system is as follows: filter 8, hydraulic pump 9, three-position two-way solenoid directional valve 12, pressure gauge, second check valve 13, accumulator 14, first check valve 15, three-position four-way solenoid directional valve 16, and oil cylinder.

[0051] The oil return circuit of the tooling system is as follows: oil cylinder, three-position four-way solenoid directional valve 16, oil tank.

[0052] When the hydraulic cylinder needs to perform a stationary action:

[0053] Step A.1) Connect the B1 and B2 ports of the three-position two-way solenoid directional valve to open the second check valve, so that the hydraulic oil of the hydraulic module flows into the accumulator.

[0054] Step A.2) When the pressure gauge measures that the accumulator pressure reaches the preset value, the first check valve is opened, and at the same time, the A1 and A3 terminals of the three-position four-way solenoid directional valve are connected and the A2 and A4 terminals are connected, so that the accumulator transmits hydraulic oil to the oil inlet chamber of the oil cylinder and drives the oil cylinder to perform a fixed action.

[0055] When the hydraulic cylinder needs to perform a releasing action:

[0056] Step B.1) Connect the B1 and B2 ports of the three-position two-way solenoid directional valve, and at the same time open the second check valve and close the first check valve, so that the hydraulic oil of the hydraulic module flows into the accumulator through the three-position two-way solenoid directional valve, pressure gauge, pressure sensor and check valve.

[0057] Step B.2) When the accumulator pressure reaches the preset value, control the first check valve to open, and at the same time control the A1 and A4 ports of the three-position four-way solenoid directional valve to connect and the A2 and A3 ports to connect, so that the accumulator transmits hydraulic oil to the return oil chamber and drives the oil cylinder to loosen the parts.

[0058] This embodiment takes the machining of the side wall of the hollow area surrounded by the ribs of the rudder surface part as an example. The tooling working method is as follows:

[0059] First, the part is fixed, and the skeleton part is straightened and aligned using a zero-point positioning mechanism. Then, the hydraulic module controls the movement of the hydraulic floating support 3, the first indexing clamping cylinder 2, and the second indexing clamping cylinder 5. The first indexing clamping cylinder 2 clamps the process boss, and the hydraulic floating support 3 supports the bottom of the part. The hydraulic floating support 3 flexibly adapts to cutting forces through the support force of its hydraulic floating characteristics, and its ability to adapt to inclined clamping avoids gaps at the bottom of the part. The internal rib structure of the part is a suspended structure with a thickness of less than 5mm, belonging to a low-rigidity structure. The second rotating shaft clamping cylinder 5 clamps the inclined surface of the rib to prevent excessive elastic deformation. Figure 1 As shown, the part has a wedge-shaped main body composed of inclined planes A1, A2 / B1, and B2, with beveled surfaces and internal supporting ribs. Based on the part's structure, the main wedge surface is first machined in an alternating sequence of planes A and B, allowing the internal stress of the cast blank to be released symmetrically during machining. For example... Figure 2 As shown, the first rotating shaft clamping cylinder 5 will interfere with part of the toolpath during the side milling of the rib, so process planning and batch processing are required.

[0060] by Figure 3Taking the three hollowed-out areas shown as examples, when machining hollowed-out area 1, the rotating shaft clamping cylinder 5-1 is released, and the remaining work is performed, with the cutting tool performing contour milling along the side wall of hollowed-out area 1; when machining hollowed-out area 2, the rotating shaft clamping cylinders 5-2 and 5-3 are released, and the remaining work is performed, with the cutting tool performing contour milling along the side wall of hollowed-out area 2; when machining hollowed-out area 3, the rotating shaft clamping cylinders 5-4, 5-5, and 5-6 are released, and the remaining work is performed, with the cutting tool performing contour milling along the side wall of hollowed-out area 3.

[0061] like Figures 4 to 6 As shown, when machining the C-side, D-side, and C-side groove of the part, it is necessary to cut off the process boss and loosen the rotating shaft clamping cylinder 5 to avoid interference with the toolpath.

[0062] As can be seen from the above technical solution, the present invention has the following prominent substantive features and significant technical progress:

[0063] 1. By utilizing the hydraulic floating characteristics of several hydraulic floating supports and indexing clamping cylinders, the clamping force on the beveled surface and hollow structure of the part blank was adjusted and controlled accordingly, providing reliable floating clamping for different cast blanks. Through the control of the action sequence of each hydraulic clamping module and the batch processing of suspended ribs, the elastic deformation and chattering problems of the rib structure during part processing were prevented, achieving precision machining of weakly rigid structures.

[0064] 2. By controlling the sequence of actions of each hydraulic actuation module, the automated clamping of such skeleton parts can be achieved, reducing labor intensity and manual intervention, and improving the efficiency of parts processing.

[0065] Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention shall be included within the scope of protection of this invention.

Claims

1. An automated tooling system for machining hollowed-out beveled skeleton parts, characterized in that, The tooling base plate is fixed to the machine tool worktable. The tooling base plate is equipped with a hydraulic module, several indexing and clamping cylinders, several hydraulic floating supports and a zero-point positioning mechanism. The hydraulic module is connected to the indexing and clamping cylinders, hydraulic floating supports and zero-point positioning mechanism through hydraulic oil pipes to provide hydraulic power and control the cylinder movement. Zero-point positioning mechanism (6) is located at the two positioning holes of the part and cooperates with the positioning holes of the part for quick alignment; The indexing clamping cylinders are located at the process boss of the part and the hollow area surrounded by the ribs of the part, respectively. The upper piston rod is equipped with a pressure plate (7) to adaptively clamp the process boss, the oblique surface and the ribs of the part, respectively. The piston of the cylinder can rotate to avoid the tool path when machining the side wall of the part. The indexing clamping cylinder has two interfaces for controlling the clamping action of the indexing clamping cylinder and the rotation action of the cylinder piston. The hydraulic floating support (3), located at the bottom of the part, is used to provide adaptive support to compensate for the non-horizontal state of the cut surface of the machined part and the vibration and positional deviation generated during the machining of the loaded part; the hydraulic floating support (3) contains two interfaces for controlling the piston action; The hydraulic module includes several three-position four-way solenoid directional valves. The two interfaces of the indexing clamping cylinder and the hydraulic floating support (3) are connected to the A1 and A2 interfaces of the three-position four-way solenoid directional valves. The A1 interface of the three-position four-way solenoid directional valve is connected to the oil inlet pipe of the cylinder, and the A2 interface is connected to the oil return pipe of the cylinder. It is used to output the pressure of the cylinder to the parts to realize adaptive fixing of the parts. The A3 interface is connected to the outlet pipe of the first check valve. The inlet pipe of the first check valve is connected to the accumulator. The three-position four-way solenoid directional valve is also connected to the PLC program to control the working conditions of the indexing clamping cylinder and the hydraulic floating support (3) to realize clamping of different steps and tool path avoidance. The hydraulic module also includes several three-position two-way solenoid directional valves, several two-position two-way solenoid directional valves, several pressure sensors, several pressure gauges, and several check valves. The B1 port of the three-position two-way solenoid directional valve, the pressure gauge, the pressure sensor, and the inlet of the second check valve are connected in sequence. The outlet of the second check valve is connected to the accumulator and the inlet pipe of the first check valve, respectively. The B2 port and B3 port of the three-position two-way solenoid directional valve are both connected to the oil tank. The oil tank is sequentially connected to the inlet of the hydraulic pump and the inlet of the third check valve. The outlet of the third check valve is connected to the B2 port of the three-position two-way solenoid directional valve. The oil tank is sequentially connected to the inlet of the pressure relief valve and the inlet of the third check valve. The outlet of the third check valve is connected to the B2 port of the three-position two-way solenoid directional valve. The B3 port of the three-position two-way solenoid directional valve is sequentially connected to the inlet of the two-position two-way solenoid directional valve and the inlet of the fourth check valve. The outlet of the fourth check valve is connected to the oil tank. The PLC outputs control signals to the three-position four-way solenoid directional valve, the three-position two-way solenoid directional valve, and the two-position two-way solenoid directional valve to switch the connection mode of the internal ports of the directional valves and to fix or release the oil cylinder.

2. The automated tooling system based on claim 1, characterized in that, When adaptively clamping the workpiece, the hydraulic floating support and the hydraulic indexing clamping cylinder are fixed. The PLC program outputs a control signal to the three-position two-way solenoid valve, connecting the B1 and B2 interfaces of the three-position two-way solenoid valve. The hydraulic oil from the hydraulic module flows into the accumulator through the second check valve. When the pressure gauge measures that the accumulator pressure reaches the preset value, the PLC program outputs a control signal to open the first check valve. At the same time, it controls the three-position four-way solenoid valve to connect the A1 and A3 interfaces and the A2 and A4 interfaces, so that the accumulator transfers the hydraulic oil to the oil inlet chamber of the cylinder. The hydraulic floating support lifts the supporting parts, and the indexing clamping cylinder presses the parts down, realizing adaptive clamping of the workpiece.

3. The automated tooling system based on claim 1, characterized in that, When the workpiece is self-adaptively released, the hydraulic floating support and hydraulic indexing clamping cylinder are released. The PLC program outputs a control signal to the three-position two-way solenoid directional valve, connecting the B1 and B3 interfaces of the three-position two-way solenoid directional valve. At the same time, the PLC program outputs a control signal to open the second check valve and close the first check valve, so that the hydraulic oil of the hydraulic module flows into the accumulator through the three-position two-way solenoid directional valve, pressure gauge, pressure sensor, and check valve. When the accumulator pressure reaches the preset value, the first check valve is opened, and the A1 and A4 interfaces of the three-position four-way solenoid directional valve and the A2 and A3 interfaces are connected, so that the accumulator transfers the hydraulic oil back to the oil tank, driving the cylinder to release the part.

4. A working method of an automated tooling system for machining hollowed-out beveled skeleton parts, based on the automated tooling system according to any one of claims 1-3, comprising the following specific steps: 1) The part to be machined is placed on the tooling base plate and positioned by the zero positioning mechanism and the part positioning hole; 2) The hydraulic module is controlled by a PLC to fix the parts; 3) Roughly machine surface A of part, and after completion, release the pressure of the hydraulic module by controlling the PLC to release the machining stress of the part; 4) Repeat the above steps to complete the roughing of surface B, the finishing of surface A, and the finishing of surface B; 5) The indexing and clamping cylinders around the hollow area formed by the ribs of the moving parts perform side wall machining of the corresponding hollow area, while the other indexing and clamping cylinders are released to avoid tool movement. 6) Control the hydraulic module to release the C-surface indexing and clamping cylinder to perform C-surface machining and cavity machining; 7) Control the hydraulic module to clamp the C-side indexing clamping cylinder, release the D-side indexing clamping cylinder, and perform D-side machining.

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