A processing tool for mold milling

Abstract

The present invention relates to a processing tool for mold milling, comprising a base and a clamping device arranged on the base, the clamping device comprising clamping units arranged around a workpiece to be processed, and a base for fixing the clamping unit is arranged on the base; the clamping unit comprises a box body fixed on the base and a cylinder arranged on a side of the box body away from the workpiece, and a side of the box body close to the workpiece is provided with a plurality of push rod mechanisms pushed by the cylinder; the push rod mechanism is a two-stage type, comprising a middle piston and a piston rod close to the workpiece, a first chamber is arranged between the piston and the piston rod, an electrorheological fluid is arranged in the first chamber, and an electrode is arranged on the inner wall of the first chamber; the novel processing tool can clamp the workpiece of complex shape through the telescopic push rod mechanism, and the electrorheological fluid in the first chamber and the second chamber can be converted into a solid state, which can provide stable support, and can reduce vibration during processing through the control of a controller.

Description

Technical Field

[0001] The invention relates to the field of machinery, and in particular to a processing tool for mold milling. Background Art

[0002] In the field of mechanical processing, especially in mold milling, specific processing tools are needed to clamp the workpiece to ensure the stability and accuracy of the workpiece during the processing. Traditional tooling clamping methods usually rely on applying uniform and large clamping forces in all directions to offset the thrust and vibration forces generated during the milling process. However, this clamping method that relies on static reaction force has significant shortcomings:

[0003] Too much clamping force: To ensure the stability of the workpiece, the clamping force in all directions must be very large, which can easily damage workpieces with low hardness or thin-walled structures, causing processing deformation or surface damage. Especially when processing brittle materials, excessive clamping force may cause material cracking, seriously affecting processing quality and yield rate.

[0004] Vibration problem: In milling, especially at high speed or large cutting depth, the contact between the milling cutter and the workpiece will generate large cutting vibrations. These vibrations will be transmitted to the workpiece through the clamping device, resulting in increased machining errors, deterioration of the workpiece surface roughness, and accelerated wear of the machining equipment and tooling. Traditional clamping devices are difficult to effectively absorb these vibrations, thus affecting the machining accuracy and equipment life.

[0005] Energy consumption and equipment load: Since a large clamping force needs to be maintained in all directions, the energy consumption of the pneumatic or hydraulic system increases significantly, and the load on the processing equipment increases, resulting in a decrease in overall energy efficiency. In addition, high-load operation will also increase system wear and maintenance costs, which is not conducive to long-term stable operation.

[0006] Lack of vibration absorption function: The existing processing tooling design cannot take into account both the clamping force and the vibration absorption function. Especially when the clamping force is required to be uniform and large, the tooling cannot achieve effective vibration absorption in the non-processing direction. This makes vibration transmission during the processing inevitable, further affecting the processing accuracy and equipment stability.

[0007] Therefore, the existing technology urgently needs an improved processing tooling, which can provide adjustable active thrust to offset the milling thrust through innovative mechanical design, thereby reducing the clamping force requirements in other directions, achieving vibration absorption, and ensuring the stability and processing accuracy of the workpiece. This improvement can not only protect the workpiece and reduce energy consumption, but also extend the service life of the tooling and improve the overall processing efficiency and quality. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a processing tool for mold milling. Through the telescopic push rod mechanism distributed on the entire surface, it can clamp workpieces of complex shapes, so that the force at various positions of the workpiece is more uniform, and the protruding or weak parts of the workpiece will not be damaged; at the same time, the electrorheological fluid in the first chamber and the second chamber can be converted into a solid state, which can provide stable support; through the control of the controller, the hardness of the electrorheological fluid in the non-cutting forward direction can be reduced, thereby absorbing the vibration during processing, which can not only ensure the processing accuracy, but also greatly improve the service life of the processing tool.

[0009] The technical solution of the present invention is as follows:

[0010] A processing tool for mold milling, comprising a base and a clamping device arranged on the base, the clamping device comprising clamping units arranged around a workpiece to be processed, and a base for fixing the clamping unit is arranged on the base; the clamping unit comprises a box body fixed on the base and a cylinder arranged on a side of the box body away from the workpiece, and a side of the box body close to the workpiece is provided with a plurality of push rod mechanisms driven by the cylinder; the push rod mechanism is a two-stage type, comprising a middle piston and a piston rod close to the workpiece, a first chamber is arranged between the piston and the piston rod, an electrorheological fluid is arranged in the first chamber, and an electrode is arranged on the inner wall of the first chamber.

[0011] A flow channel is provided in the middle of the piston rod, and the flow channel is connected to the first chamber; a second chamber is provided at one end of the flow channel away from the first chamber, and a side of the second chamber away from the first chamber is wrapped by an elastic liquid bag.

[0012] Among them, the axial cross-section of the piston rod is T-shaped, including a tail plate and a shaft rod perpendicular to the tail plate; the flow channel is arranged in the axial middle part of the shaft rod; a compression spring is arranged on the side of the shaft rod, one end of the compression spring is supported on the box body, and the other end is supported on the tail plate of the piston rod.

[0013] Wherein, a first sealing ring is arranged around the side surface of the tail plate, and a second sealing ring is arranged around the side surface of the piston.

[0014] Wherein, the box body is provided with a plurality of stepped through holes corresponding to the push rod mechanism, and the through holes include a piston hole slidably connected to the piston, and a cylinder barrel slidably connected to the shaft rod; the diameter of the piston is equal to or slightly smaller than the piston hole, the diameter of the tail plate is equal to or slightly smaller than the piston hole, and the diameter of the shaft rod is equal to or slightly smaller than the diameter of the cylinder barrel.

[0015] Wherein, a partition is fixedly arranged in the middle of the piston hole, and a channel is arranged on the partition.

[0016] Wherein, a circle of flexible connecting sleeve is arranged at the end of the shaft rod away from the piston, and the liquid bag is fixedly connected to the end of the connecting sleeve away from the shaft rod.

[0017] Wherein, the cylinder comprises an air cavity and a joint connected to an air pipe, the joint is communicated with the air cavity; the air cavity is communicated with a piston hole on the box body.

[0018] Wherein, a trapezoidal reinforcing rib is arranged on one side of the base, the height of the reinforcing rib is equal to the base, and the bottom of the box body is fixedly connected to the upper end of the reinforcing rib.

[0019] Wherein, a controller is arranged on the upper end of the base, and the controller is electrically connected to the milling machine tool.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention is provided with a full-surface telescopic push rod mechanism around the workpiece to be processed. Under the push of the cylinder, it can fit the outer surface of the workpiece, can clamp workpieces of complex shapes, make the force on each position of the workpiece more uniform, and will not damage the protruding or weak parts of the workpiece.

[0022] 2. In the present invention, electrorheological fluid is injected into the first chamber and the second chamber. After the push rod mechanism clamps the workpiece and applies the required clamping force, the electrorheological fluid in the first chamber and the second chamber changes from liquid to solid under the action of the electric current. At this time, the push rod mechanism is a hard connection, and a reverse clamping force is applied to the workpiece to be processed by relying on the deformation of the electrorheological fluid and the processing tooling. Compared with the pressurized clamping of a cylinder or a hydraulic cylinder, the hard connection after the electrorheological fluid is solidified is more stable and reliable.

[0023] 3. After the electrorheological fluid of the present invention changes from liquid to solid, it cannot flow through the partition channel. At this time, the partition serves as a force support point for the electrorheological fluid, and can transfer the force exerted on the electrorheological fluid to the box and the base. The strength of the entire processing tooling is improved. In addition, the clamping cylinder or hydraulic cylinder will not be damaged during milling.

[0024] 4. The electrorheological fluid of the present invention is controlled by a controller, and the controller is electrically connected to the control system of the processing lathe; when the equipment processes in one direction, the controller recognizes the signal and inputs a certain current to the clamping unit in the non-processing direction, so that the hardness of the corresponding electrorheological fluid is reduced. At this time, the clamping unit can greatly absorb the vibration generated during processing while ensuring the clamping force, thereby avoiding the wear of the processing tooling and improving the processing accuracy.

[0025] 5. The electrorheological fluid of the present invention is wrapped by a liquid capsule, and the liquid capsule is preferably made of a highly elastic and high-strength polymer material such as polyester fiber or polyurethane. It not only has a good wrapping effect, but also can be more completely attached to the surface of the workpiece, so that the force on each part of the workpiece is more uniform, and the workpiece can be prevented from being damaged by local high-intensity extrusion force.

[0026] 6. A connecting sleeve is provided between the liquid capsule and the shaft rod of the present invention. The connecting sleeve is preferably made of a rubber-like highly elastic polymer material with reversible deformation, which can not only provide support for the liquid capsule, but also produce a certain amount of deformation along with the liquid capsule, thereby preventing the liquid capsule from directly contacting hard objects and causing pulling and rupture abnormalities.

[0027] 7. The compression spring of the present invention provides a certain thrust for the return of the ejector mechanism. Since the electrorheological fluid is relatively viscous and has a large flow resistance, the ejector mechanism takes a long time to return when the cylinder is evacuated to a negative vacuum. The compression spring can reduce the return time and improve processing efficiency.

[0028] 8. The first sealing ring and the second sealing ring of the present invention can provide a better sealing effect, and the mounting grooves of the sealing rings are arranged on the tail plate and the piston, so as to ensure that the electrorheological fluid in the first chamber will not overflow, which can greatly improve the reliability of the tooling.

[0029] 9. The reinforcing ribs of the present invention can provide support for the base. At the same time, the upper and lower ends of the reinforcing ribs are respectively connected to the box body and the base, which can improve the rigidity of the processing tooling and greatly increase the service life of the processing tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the present invention;

[0031] Figure 2 is a side view of the present invention;

[0032] Figure 3 is a top cross-sectional view of the present invention;

[0033] Figure 4 For the present invention Figure 3 A magnified view of the circled location;

[0034] Figure 5 is a cross-sectional view of the piston rod of the present invention;

[0035] Figure 6 It is a cross-sectional view of the box body of the present invention.

[0036] The reference numerals in the figure are as follows:

[0037] 1-base, 2-clamping unit, 3-base, 4-box, 5-cylinder, 6-rod mechanism, 7-piston, 8-piston rod, 9-first chamber, 10-electrode, 11-flow channel, 12-second chamber, 13-liquid capsule, 14-tail plate, 15-shaft rod, 16-compression spring, 17-first sealing ring, 18-second sealing ring, 19-piston hole, 20-cylinder barrel, 21-partition, 22-channel, 23-connecting sleeve, 24-air cavity, 25-connector, 26-reinforcement rib, 27-controller. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1: See Figures 1 to 6 A processing tool for mold milling, comprising a base 1 and a clamping device arranged on the base 1, wherein the clamping device comprises a clamping unit 2 arranged around the workpiece to be processed, and the base 1 is provided with a base 3 for fixing the clamping unit 2; the clamping unit 2 comprises a box body 4 fixed on the base 3 and a cylinder 5 arranged on the side of the box body 4 away from the workpiece, and the side of the box body 4 close to the workpiece is provided with a plurality of push rod mechanisms 6 driven by the cylinder 5, under the push of the cylinder 5, the push rod mechanism 6 can fit the outer surface of the workpiece, can clamp the workpiece of complex shape, and make the force on each position of the workpiece more uniform; the push rod mechanism 6 is a two-stage type, including a middle piston 7 and a piston rod 8 close to the workpiece side, a first chamber 9 is arranged between the piston 7 and the piston rod 8, an electrorheological fluid is arranged in the first chamber 9, and an electrode 10 is arranged on the inner wall of the first chamber 9. After the push rod mechanism 6 clamps the workpiece and applies the required clamping force, the electrorheological fluid in the first chamber 9 changes from liquid to solid under the action of the current. At this time, the push rod mechanism 6 is a hard connection, and the reverse clamping force is applied to the workpiece to be processed by relying on the deformation of the electrorheological fluid and the processing tooling; a controller 27 is arranged on the upper end of the base 1, and the controller 27 is electrically connected to the milling machine.

[0040] Furthermore, the controller 27 shares the input and display interface of the machine end. The controller 27 controls the current strength of the electrode 10 on the electrorheological fluid. Different current intensities will affect the hardness or solid-liquid form of the electrorheological fluid. When the equipment is processed in one direction, the controller 27 recognizes the signal given by the machine and inputs a certain current to the electrode 10 of the clamping unit 2 in the non-processing direction, so that the hardness of the corresponding electrorheological fluid is reduced. At this time, the clamping unit 2 can greatly absorb the vibration generated during processing while ensuring the clamping force, thereby avoiding the wear of the processing tooling.

[0041] For further information, see Figure 4 and 5A flow channel 11 is provided in the middle of the piston rod 8, and the flow channel 11 is connected to the first chamber 9; a second chamber 12 is provided at one end of the flow channel 11 away from the first chamber 9, and the side of the second chamber 12 away from the first chamber 9 is wrapped by an elastic liquid bag 13. The liquid bag 13 is preferably made of a highly elastic and high-strength polymer material such as polyester fiber or polyurethane, which not only has a good wrapping effect, but also can be more completely attached to the surface of the workpiece, so that the force on each part of the workpiece is more uniform.

[0042] Furthermore, the axial cross-section of the piston rod 8 is T-shaped, including a tail plate 14 and a shaft 15 perpendicular to the tail plate 14; the flow channel 11 is arranged in the axial middle part of the shaft 15; a compression spring 16 is arranged on the side of the shaft 15, one end of the compression spring 16 is supported on the box body 4, and the other end is supported on the tail plate 14 of the piston rod 8. Because the electrorheological fluid is relatively viscous and has a large flow resistance, when the cylinder is evacuated to a negative vacuum, the return time of the push rod mechanism 6 is relatively long, and the compression spring 16 provides a certain thrust for the return of the push rod mechanism 6, which can reduce the return time and improve the processing efficiency; a first sealing ring 17 is arranged on a circle on the side of the tail plate 14, and a second sealing ring 18 is arranged on a circle on the side of the piston 7. The first sealing ring 17 and the second sealing ring 18 can provide a better sealing effect, and the mounting grooves of the sealing rings are arranged on the tail plate 14 and the piston 7. When the piston 7 and the piston rod 8 move, it can ensure that the electrorheological fluid in the first chamber 9 will not overflow.

[0043] For further information, see Figure 6 The box body 4 is provided with a plurality of stepped through holes corresponding to the push rod mechanism 6, and the through holes include a piston hole 19 slidably connected to the piston 7, and a cylinder 20 slidably connected to the shaft 15; the diameter of the piston 7 is equal to or slightly smaller than the piston hole 19, the diameter of the tail plate 14 is equal to or slightly smaller than the piston hole 19, and the diameter of the shaft 15 is equal to or slightly smaller than the diameter of the cylinder 20; a partition 21 is fixedly provided in the middle of the piston hole 19, and a channel 22 is provided on the partition 21. After the electrorheological fluid changes from liquid to solid, it cannot flow through the channel 22 of the partition 21. The time interval 21 serves as the force support point of the electrorheological fluid, which can transmit the force exerted on the electrorheological fluid to the box body 4 and the base 3, and the strength of the entire processing tooling is greatly improved; the end of the shaft rod 15 away from the piston 7 is provided with a circle of flexible connecting sleeve 23, and the liquid capsule 13 is fixedly connected to the end of the connecting sleeve 23 away from the shaft rod 15. The connecting sleeve 23 is preferably made of a rubber-like highly elastic polymer material with reversible deformation, which can not only provide support for the liquid capsule 13, but also can produce a certain amount of deformation with the liquid capsule 13, which can avoid the liquid capsule 13 directly contacting with hard objects and causing pulling and rupture abnormalities.

[0044] Furthermore, the cylinder 5 includes an air cavity 24 and a joint 25 connected to the air pipe, and the joint 25 is connected to the air cavity 24. After the processing tooling is installed on the equipment, the joint 25 is connected to the air pipe on the equipment end, and the air pressure in the cylinder 5 is controlled by the control interface on the equipment end; the air cavity 24 is connected to all the piston holes 19 on the box body 4. When the air pressure in the air cavity 24 is set, all the pistons 7 on the box body 4 move toward the workpiece together and abut against the uneven side surface of the workpiece; according to the shape of the workpiece, the position of the push rod mechanism 6 can be adjusted to avoid weak parts on the workpiece while ensuring the clamping force.

[0045] Furthermore, a trapezoidal reinforcing rib 26 is provided on one side of the base 3, and the height of the reinforcing rib 26 is equal to that of the base 3. The bottom of the box body 4 is fixedly connected to the upper end of the reinforcing rib 26; the reinforcing rib 26 can not only provide support for the base 3, but also enhance the overall rigidity of the processing tooling; a U-shaped groove for bolt installation is provided on the base 1, which is used to install the processing tooling on the processing equipment.

[0046] Working principle of the present invention:

[0047] First, fix the processing tooling on the machine tool by bolts, and connect the air pipe on the machine table with the joint 25; place the workpiece to be processed in the middle of the processing tooling, and control the air pressure supplied to the cylinder 5 through the control interface of the machine tool to inflate the cylinder 5 and generate thrust on the piston 7; after the piston 7 is subjected to force, it pushes the electrorheological fluid in the first chamber 9 to flow, and the piston rod 8 moves toward the workpiece and clamps the workpiece under the action of the electrorheological fluid, and the liquid capsule 13 is attached to the surface of the workpiece to be processed at this time; when the clamping force reaches the set value of the pressure of the cylinder 5, the controller 27 controls the electrode 10 to supply current, so that the electrorheological fluid changes from liquid to solid, and at this time, the clamping force on the workpiece changes from the force of the cylinder 5 to the deformation force of the electrorheological fluid.

[0048] During the machining process, the milling operation moves forward in the set direction. At this time, the controller 27 recognizes the machine tool's instructions and controls the electrode 10 in the non-milling direction to apply a certain current to the electrorheological fluid. At this time, the hardness of the electrorheological fluid becomes lower, and it has a better shock absorption effect without reducing the clamping effect. When the milling turns, the controller 27 can control the electrorheological fluid to change accordingly to ensure that the hardness of the electrorheological fluid in the milling direction meets the support, and the electrorheological fluid in the non-milling direction has the function of absorbing vibration.

[0049] After the processing is completed, the electrode 10 stops energizing, and the electrorheological fluid changes from solid to liquid. At the same time, negative pressure is applied to the air cavity 24 of the cylinder 5, and the piston 7 moves toward the cylinder 5. The electrorheological fluid passes through the partition 21 and flows toward the piston 7. Under the combined action of the electrorheological fluid and the compression spring 16, the piston rod 8 quickly returns to its original position and releases the clamping of the workpiece. Example

[0050] The push rod mechanism 6 as a whole is sealed and slidably matched with the cylinder 5. During the processing, the controller 27 recognizes the instruction of the machine tool, and the controller 27 controls the air pressure of the air chamber 24 in the forward direction of the milling cutter to increase, thereby increasing the thrust of the push rod mechanism 6 as a whole in this direction to offset the thrust of the milling cutter on the workpiece during the forward process. It has the following special effects:

[0051] 1. Optimize the clamping force distribution and reduce the total clamping force requirement

[0052] Traditional clamping systems rely on clamping forces in all directions to jointly generate static reaction forces to offset the thrust applied during milling. This means that the clamping force in each direction must be large, resulting in an unnecessary increase in clamping force, especially when machining workpieces with lower hardness, which may cause damage to the workpiece. The design of the present invention actively applies additional thrust in the forward direction of the milling cutter to effectively offset the milling force, so that the clamping force required in other directions can be significantly reduced.

[0053] 2. Realize vibration absorption function and improve processing stability

[0054] Since the traditional clamping method requires large and uniform clamping forces in all directions, it is difficult to take into account the vibration absorption effect. In the present invention, by actively applying thrust to offset the milling force, the clamping force in other directions can be reduced, thereby adjusting some clamping units to a vibration absorption state. This method allows the tooling to maintain the stability of the workpiece while absorbing and buffering the vibration generated during the processing, thereby improving the processing accuracy and durability of the tooling.

[0055] 3. Effectively offset the cutting thrust of the milling cutter

[0056] During the milling process, the milling cutter applies a large cutting thrust to the workpiece, especially on workpieces with low hardness or complex shapes. The cutting force may cause the workpiece to move, deform or loosen. Active thrust is generated by increasing the air pressure in the air chamber 24. This design is different from passive offset. It emphasizes the active application of additional thrust during the milling process, so that the piston rod 8 applies a greater clamping force to the workpiece to offset and "actively resist" the cutting thrust of the milling cutter on the workpiece during the milling process. The application of active thrust means that the system does not just rely on passive structural rigidity to resist the thrust, but maintains the stability of the workpiece by precisely controlling the applied thrust. The use of active thrust can significantly improve the stability of the milling process, reduce the loosening or displacement of the workpiece caused by the cutting force, and make the clamping of the workpiece more stable, thereby further improving the processing accuracy and the surface quality of the workpiece.

[0057] 4. Enhance the controllability of the processing

[0058] Active thrust enables the system to actively adjust the clamping force applied by the piston rod 8 according to the real-time changes in the cutting force. This control can accurately adjust the thrust size, so as to flexibly respond to different processing situations and cutting force changes. Compared with passive clamping systems, active thrust systems have higher responsiveness, which is particularly important when milling workpieces with complex shapes or changing material properties. It improves the controllability of the processing process, reduces the impact on workpiece deformation, optimizes processing conditions, and makes the processing of complex workpieces more accurate and predictable.

[0059] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A processing tool for mold milling, characterized in that: The invention comprises a base (1) and a clamping device arranged on the base (1), wherein the clamping device comprises a clamping unit (2) arranged around a workpiece to be processed, and the base (1) is provided with a base (3) for fixing the clamping unit (2); the clamping unit (2) comprises a box (4) fixed on the base (3) and a cylinder (5) arranged on a side of the box (4) away from the workpiece, and a plurality of push rod mechanisms (6) driven by the cylinder (5) are arranged on a side of the box (4) close to the workpiece; the push rod mechanism (6) is a two-stage type, comprising a piston (7) in the middle and a piston rod (8) close to the workpiece, and a first chamber (9) is arranged between the piston (7) and the piston rod (8). ), an electrorheological fluid is arranged in the first chamber (9), and an electrode (10) is arranged on the inner wall of the first chamber (9); a flow channel (11) is arranged in the middle of the piston rod (8), and the flow channel (11) is connected to the first chamber (9); a second chamber (12) is arranged at the end of the flow channel (11) away from the first chamber (9), and the side of the second chamber (12) away from the first chamber (9) is wrapped by an elastic liquid bag (13); a trapezoidal reinforcing rib (26) is arranged on one side of the base (3), and the height of the reinforcing rib (26) is equal to that of the base (3), and the bottom of the box body (4) is fixedly connected to the upper end of the reinforcing rib (26); the base (1) A controller (27) is arranged at the upper end, and the controller (27) is electrically connected to the milling machine tool; the cylinder (5) includes an air cavity (24) and a joint (25) connected to an air pipe, and the joint (25) is communicated with the air cavity (24); the air cavity (24) is communicated with a piston hole (19) on the box body (4); the push rod mechanism (6) is integrally sealed and slidably matched with the cylinder (5); the axial cross section of the piston rod (8) is T-shaped, including a tail plate (14) and a shaft (15) perpendicular to the tail plate (14); the flow channel (11) is arranged at the axial middle part of the shaft (15); a compression spring (16) is arranged on the side of the shaft (15), and the compression spring (16) is The piston (7) has a first end supported on a housing (4) and the other end supported on a tail plate (14) of a piston rod (8); the housing (4) is provided with a plurality of stepped through holes corresponding to the push rod mechanism (6), the through holes comprising a piston hole (19) slidably connected to the piston (7) and a cylinder barrel (20) slidably connected to the shaft rod (15); the diameter of the piston (7) is equal to or slightly smaller than the piston hole (19), the diameter of the tail plate (14) is equal to or slightly smaller than the piston hole (19), and the diameter of the shaft rod (15) is equal to or slightly smaller than the diameter of the cylinder barrel (20); a partition (21) is fixedly provided in the middle of the piston hole (19), and a channel (22) is provided on the partition (21).

2. A processing tool for mold milling as claimed in claim 1, characterized in that: A first sealing ring (17) is arranged around the side surface of the tail plate (14), and a second sealing ring (18) is arranged around the side surface of the piston (7).

3. A processing tool for mold milling as claimed in claim 1, characterized in that: A flexible connecting sleeve (23) is provided at the end of the shaft rod (15) away from the piston (7), and the liquid bag (13) is fixedly connected to the end of the connecting sleeve (23) away from the shaft rod (15).

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