Hole machining tool passivation device and method based on water sand blasting process

Abstract

The hole machining tool passivating device comprises a base, a passivating box body is arranged at the top of the base, a closing door is hinged to one side of the passivating box body, a main motor is arranged in the middle of the passivating box body, the output end of the main motor penetrates through the passivating box body and is provided with a rotating shaft, and a rotating disc is arranged at the bottom of the rotating shaft; clamping devices facilitating compensation are circumferentially distributed on the rotating disc, a water sand blasting mechanism is arranged on the inner side of the passivation box body, a spray head of the water sand blasting mechanism faces the hole machining tool, and each clamping device comprises a clamping block and an abutting plate; according to the clamping device, the abutting plate is additionally arranged in the clamping device, axial supporting can be provided for the drill point of the tool while the handle of the tool is clamped, tool axial movement caused by sand blasting jet impact force is effectively counteracted, radial deflection caused by centrifugal force and sand blasting counter-acting force in the rotating process is reduced, and the tool drill point drilling precision is improved. And the cutter is kept at a more stable position in the passivation process.

Description

Technical Field

[0001] The present invention relates to the technical field of precision tool manufacturing, and in particular to a hole machining tool passivation device and method based on a water sandblasting process. Background Art

[0002] During the manufacturing process of hole processing tools such as drills, reamers, and milling cutters, microscopic burrs, curled edges, or sharp edges often exist on the cutting edge, which directly affects the cutting performance and life. Passivation treatment is a key step in finishing. By removing cutting edge defects and forming micro-rounded corners, it can significantly improve the wear resistance of the tool, reduce the risk of chipping, and improve the surface processing quality. Traditional passivation processes include manual oilstone grinding, vibration grinding, dry sandblasting, etc., but they have problems such as low efficiency, poor consistency, and dust pollution. In recent years, water sandblasting technology has gradually become the mainstream process for precision tool passivation due to its advantages in environmental protection, cooling effect, and surface treatment uniformity.

[0003] Current mainstream equipment typically consists of a closed box, a sandblasting system, a workpiece clamping mechanism, and a rotary drive unit. The clamping mechanism often uses a fixed V-block, a three-jaw chuck, or a simple fixture. After the tool is clamped vertically, it is driven by a motor to rotate so that the cutting edge is evenly impacted by the abrasive water jet. Some equipment incorporates a turntable structure to achieve multi-station continuous operation and improve batch processing efficiency, but there are technical drawbacks: The impact force of the sandblasting jet can easily cause slender tools, such as deep hole drills and micro drills, to experience axial movement or radial deflection. Especially when the length-to-diameter ratio (L / D) is greater than 5, the vibration is aggravated. The existing clamping mechanism only constrains the shank, and the drill tip has no rigid support. During rotation, the tool is affected by the centrifugal force and the reaction force of the sandblasting, and is prone to micro-bending and deformation, resulting in uneven thickness of the passivation layer and even damage to the cutting edge. Summary of the Invention

[0004] The purpose of the present invention is to provide a hole machining tool passivation device and method based on a water sandblasting process to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a hole machining tool passivation device based on a water sandblasting process, comprising a base, a passivation box provided on the top of the base, a closing door hingedly connected to one side of the passivation box, a main motor provided in the middle of the passivation box, a rotating shaft provided at the output end of the main motor passing through the passivation box, a turntable provided at the bottom of the rotating shaft, and clamping devices circumferentially distributed on the turntable for easy compensation; A water sandblasting mechanism is provided on the inner side of the passivation box, and the nozzle of the water sandblasting mechanism is facing the hole processing tool. The clamping device includes a clamping block and an abutment plate. The clamping blocks on both sides form a clamping process for the hole processing tool, and the abutment plate is flipped to abut the bottom of the hole processing tool by triggering the component.

[0006] Preferably, the clamping device includes a sub-motor, and a plurality of sub-motors are distributed at the edge of the turntable. The output end of the sub-motor is provided with a support frame seat, and a transmission screw is rotatably connected to the support frame seat.

[0007] Preferably, a motor is provided at one end of the transmission screw, the transmission screw has a double-screw structure and the thread rotation directions are opposite, sliders are sleeved on both sides of the transmission screw, the sliders and the transmission screw are connected by internal and external threads, and a clamping block is provided on the inner side of the slider, and the clamping block has a V-shaped block structure.

[0008] Preferably, a connecting seat is fixedly connected to one side of the support frame seat. The connecting seat is an L-shaped block structure with a groove opened at the end. A pin is fixedly connected to the connecting seat in the groove, and an abutment plate is rotatably sleeved on the pin.

[0009] Preferably, a torsion spring is sleeved on the pin shaft, one end of the torsion spring is fixedly connected to the pin shaft, and the other end is fixedly connected to the abutment plate, and the abutment plate flips upward under the torsional force of the torsion spring.

[0010] Preferably, the touch assembly includes a cylinder and a accommodating seat, the cylinder is fixedly connected to one side of the slider, a cover plate is provided at the opening of the cylinder, a push rod is slidably inserted on the cylinder, and one end of the push rod passes through the slider and extends to be arranged between the two clamping blocks.

[0011] Preferably, a first airbag is provided between the push rod and the cover plate, and a connecting pipe is provided at one end of the first airbag passing through the cover plate.

[0012] Preferably, the accommodating seat is fixedly connected to the end of the connecting seat, and a mounting plate is provided at the opening of the accommodating seat. A stopper is slidably inserted on the mounting plate. The stopper is an L-shaped block structure, and the end thereof abuts against one side of the abutting plate.

[0013] Preferably, a second airbag is provided between the stopper and the mounting plate, the second airbag is communicated with the connecting pipe, and a return spring is provided between the stopper and the accommodating seat.

[0014] A method for passivating a hole machining tool based on a water sandblasting process, wherein the method is applied to a hole machining tool passivation device based on a water sandblasting process, and comprises the following steps: S1: Insert the hole processing tool vertically between the two clamping blocks, with the tool shank placed in the V-groove and the drill tip suspended in the air facing the abutment plate; S2: Controls the motor to rotate forward, drives the transmission screw to rotate, the slider to move, and the clamp to hold the tool handle tightly; S3: At the moment the clamping block is clamped, the tool squeezes the ejector rod backward, the first airbag is compressed, and the gas in the first airbag is injected into the second airbag through the connecting tube, causing the second airbag to expand; S4: The second airbag pushes the stopper to the right, the stopper breaks away from the limit of the abutment plate, the torsion spring releases the torque, the abutment plate flips upward, and the abutment plate presses against the drill tip; S5: Close the closing door, the main motor drives the turntable to rotate, and the tool is transferred to the sandblasting station. The nozzle of the water sandblasting mechanism performs sandblasting on the hole processing tool.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses a newly added abutment plate in the clamping device to provide axial support to the tool drill tip while clamping the tool shank. This effectively offsets the axial movement of the tool caused by the impact force of the sandblasting jet and reduces the radial runout caused by the centrifugal force during rotation and the reaction force of the sandblasting, allowing the tool to maintain a more stable position during the passivation process.

[0016] 2. The present invention specifically solves the processing difficulties of this type of tool by providing axial support for the drill tip, so that the passivation device can be more widely used in various specifications, especially slender hole processing tools.

[0017] 3. This invention achieves automated linkage between clamping and drill tip support through a trigger assembly in the clamping device. A separate motor drives clamping, and drill tip support is automatically achieved upon triggering, making operation convenient. Combined with effective clamping of slender tools, this allows for precise passivation of different cutting edge areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the hole machining tool passivation device based on the water sandblasting process of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the turntable of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the clamping device of the present invention.

[0021] Figure 4 It is a structural schematic diagram of the connecting seat of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure inside the support frame seat of the present invention.

[0023] Figure 6 It is a schematic diagram of the structure inside the cylinder of the trigger assembly of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure inside the accommodation seat in the touch assembly of the present invention.

[0025] In the figure: base 1; passivation box 2; main motor 3; rotating shaft 4; turntable 5; water sandblasting mechanism 6; clamping device 7; sub-motor 71; support frame seat 72; transmission screw 73; slider 74; clamping block 75; cylinder 8; cover plate 81; push rod 82; connecting pipe 83; first airbag 84; connecting seat 9; pin 91; torsion spring 92; abutment plate 93; accommodating seat 94; mounting plate 95; block 96; second airbag 97; return spring 98. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figures 1 to 7 The present invention provides a technical solution: a hole processing tool passivation device based on the water sandblasting process, including a base 1, the base 1 carries the entire device, and an anti-vibration gasket is provided at the bottom (not shown in the figure) to offset the vibration transmitted by the sandblasting impact. The top of the base 1 is fixedly connected to a passivation box 2, the passivation box 2 is a closed cavity, the inner side of which is covered with a wear-resistant ceramic lining to resist abrasive erosion. A closed door is hinged on one side of the passivation box 2, and the hinged closed door is provided with a pneumatic sealing strip. The pressure is increased to 0.5MPa during sandblasting to ensure sealing.

[0028] A main motor 3 is fixedly installed in the middle of the passivation box 2. The model of the main motor 3 can be selected according to the actual working conditions. The output end of the main motor 3 passes through the passivation box 2 and is fixedly connected to a rotating shaft 4. The bottom of the rotating shaft 4 is fixedly connected to a turntable 5. The turntable 5 is circumferentially distributed with clamping devices 7 for easy compensation.

[0029] A water sandblasting mechanism 6 is fixedly installed on the inner side of the passivation box 2. The nozzle of the water sandblasting mechanism 6 is facing the hole processing tool. The clamping device 7 includes a clamping block 75 and an abutment plate 93. The clamping blocks 75 on both sides form a clamping process for the hole processing tool, and the abutment plate 93 is flipped to abut the bottom of the hole processing tool by triggering the component.

[0030] The water sandblasting mechanism 6 uses a special sandblasting gun made of wear-resistant hard alloy to ensure that it is not easily worn after long-term use. The spray angle of the sandblasting gun can be adjusted within the range of 30°-60°. By adjusting the spray angle, the cutting edge of different parts of the tool can be accurately processed; and it also includes a high-pressure water jet system with a pressure control system. The pressure adjustment range is 10-50MPa and the pressure control accuracy can reach ±1MPa. The pressure change is monitored in real time by a pressure sensor and fed back to the control system for dynamic adjustment to ensure stable pressure during the sandblasting process.

[0031] The clamping device 7 includes a sub-motor 71 , and a plurality of sub-motors 71 are distributed at the edge of the turntable 5 . The output end of the sub-motor 71 is fixedly connected to a support frame seat 72 , and a transmission screw 73 is rotatably connected to the support frame seat 72 .

[0032] One end of the transmission screw 73 is fixedly connected to the motor. The transmission screw 73 has a double-screw structure and the threads rotate in opposite directions. Sliders 74 are sleeved on both sides of the transmission screw 73. The sliders 74 and the transmission screw 73 are connected by internal and external threads. A clamping block 75 is fixedly connected to the inner side of the slider 74. The clamping block 75 has a V-shaped block structure.

[0033] The sub-motor 71 drives the transmission screw 73 to rotate, and the sliders 74 on both sides move toward each other, and the V-shaped clamping block 75 holds the tool handle tightly.

[0034] A connecting seat 9 is fixedly connected to one side of the support frame seat 72. The connecting seat 9 is an L-shaped block structure with a groove opened at the end. A pin shaft 91 is fixedly connected to the connecting seat 9 in the groove, and an abutment plate 93 is rotatably sleeved on the pin shaft 91.

[0035] A torsion spring 92 is sleeved on the pin shaft 91 . One end of the torsion spring 92 is fixedly connected to the pin shaft 91 , and the other end is fixedly connected to the abutment plate 93 . The abutment plate 93 flips upward under the torsional force of the torsion spring 92 .

[0036] When the clamping block 75 clamps the tool, the push rod 82 is triggered to retreat, and the abutment plate 93 is flipped under the action of the torsion spring 92, and one side of the abutment plate 93 presses against the drill tip of the tool to form axial support.

[0037] The trigger assembly includes a cylinder 8 and a receiving seat 94. The cylinder 8 is fixedly connected to one side of the slider 74. A cover plate 81 is provided at the opening of the cylinder 8. The cover plate 81 is fixed to the cylinder 8 by screws. A push rod 82 is slidably inserted into the cylinder 8. One end of the push rod 82 extends through the slider 74 and is set between the two clamping blocks 75.

[0038] A first airbag 84 is bonded between the top rod 82 and the cover plate 81. One end of the first airbag 84 passes through the cover plate 81 and is connected to a connecting pipe 83. The accommodating seat 94 is fixedly connected to the end of the connecting seat 9. A mounting plate 95 is provided at the opening of the accommodating seat 94. The mounting plate 95 is fixed to the accommodating seat 94 by screws. A stop block 96 is slidably inserted on the mounting plate 95.

[0039] The stopper 96 is an L-shaped block structure, and its end abuts against one side of the abutment plate 93. A second airbag 97 is bonded between the stopper 96 and the mounting plate 95. The second airbag 97 is connected to the connecting tube 83. A return spring 98 is fixedly connected between the stopper 96 and the accommodating seat 94.

[0040] The clamping block 75 clamps the tool, the push rod 82 is squeezed back by the tool, the first airbag 84 is compressed, and the gas is injected into the second airbag 97 through the connecting tube 83. The second airbag 97 expands, pushing the stopper 96 to overcome the elastic force and move right. The stopper 96 disengages from the abutment plate 93, the torsion spring 92 releases the torque, and the abutment plate 93 bounces up to support the drill tip.

[0041] A method for passivating a hole machining tool based on a water sandblasting process, wherein the method is applied to a hole machining tool passivation device based on a water sandblasting process, and comprises the following steps: S1: Insert the hole machining tool vertically between the two side clamping blocks 75, with the tool shank placed in the V-shaped groove and the drill tip suspended towards the abutment plate 93; S2: Control the sub-motor 71 to rotate forward, drive the transmission screw 73 to rotate, the slider 74 to move, and the clamping block 75 to hold the tool handle tightly; S3: At the moment the clamping block 75 is clamped, the tool squeezes the ejector pin 82 backward, the first airbag 84 is compressed, and the gas in the first airbag 84 is injected into the second airbag 97 through the connecting pipe 83, causing the second airbag 97 to expand; S4: The second airbag 97 pushes the stopper 96 to move rightward, and the stopper 96 is released from the limit position of the abutment plate 93. The torsion spring 92 releases the torque, and the abutment plate 93 flips upward, and the abutment plate 93 presses against the drill tip; S5: The closing door is closed, and the main motor 3 drives the turntable 5 to rotate, and the tool is transferred to the sandblasting station. The nozzle of the water sandblasting mechanism 6 performs sandblasting on the hole processing tool.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hole machining tool passivation device based on a water sandblasting process, comprising a base (1), characterized in that: A passivation box (2) is provided on the top of the base (1), a closing door is hinged on one side of the passivation box (2), a main motor (3) is provided in the middle of the passivation box (2), an output end of the main motor (3) passes through the passivation box (2) and is provided with a rotating shaft (4), a turntable (5) is provided at the bottom of the rotating shaft (4), and clamping devices (7) for facilitating compensation are distributed circumferentially on the turntable (5); A water sandblasting mechanism (6) is provided on the inner side of the passivation box (2), and a nozzle of the water sandblasting mechanism (6) faces the hole processing tool. The clamping device (7) includes a clamping block (75) and an abutting plate (93). The clamping blocks (75) on both sides form a clamping process for the hole processing tool, and the abutting plate (93) is turned over to abut the bottom of the hole processing tool by triggering the component.

2. The hole machining tool passivation device based on the water sandblasting process according to claim 1, characterized in that: The clamping device (7) includes a sub-motor (71), and a plurality of sub-motors (71) are distributed at the edge of the turntable (5). The output end of the sub-motor (71) is provided with a support frame seat (72), and a transmission screw (73) is rotatably connected to the support frame seat (72).

3. The hole machining tool passivation device based on the water sandblasting process according to claim 2, characterized in that: A motor is provided at one end of the transmission screw (73). The transmission screw (73) is a twin-screw structure with opposite screw threads. Slide blocks (74) are sleeved on both sides of the transmission screw (73). The slide blocks (74) are connected to the transmission screw (73) by internal and external threads. A clamping block (75) is provided on the inner side of the slider (74). The clamping block (75) is a V-shaped block structure.

4. The hole machining tool passivation device based on the water sandblasting process according to claim 2, characterized in that: A connecting seat (9) is fixedly connected to one side of the support frame seat (72). The connecting seat (9) is an L-shaped block structure and has a groove at its end. A pin shaft (91) is fixedly connected to the connecting seat (9) in the groove. An abutment plate (93) is rotatably sleeved on the pin shaft (91).

5. The hole machining tool passivation device based on the water sandblasting process according to claim 4, characterized in that: A torsion spring (92) is sleeved on the pin shaft (91), one end of the torsion spring (92) is fixedly connected to the pin shaft (91), and the other end is fixedly connected to the abutment plate (93), and the abutment plate (93) flips upward under the torsional force of the torsion spring (92).

6. The hole machining tool passivation device based on the water sandblasting process according to claim 1, characterized in that: The touch assembly includes a cylinder (8) and a receiving seat (94). The cylinder (8) is fixedly connected to one side of the slider (74). A cover plate (81) is provided at the opening of the cylinder (8). A push rod (82) is slidably inserted into the cylinder (8). One end of the push rod (82) passes through the slider (74) and extends to be provided between the two clamping blocks (75).

7. The hole machining tool passivation device based on the water sandblasting process according to claim 6, characterized in that: A first airbag (84) is provided between the top rod (82) and the cover plate (81), and one end of the first airbag (84) passes through the cover plate (81) and is provided with a connecting pipe (83).

8. The hole machining tool passivation device based on the water sandblasting process according to claim 6, characterized in that: The accommodating seat (94) is fixedly connected to the end of the connecting seat (9), and a mounting plate (95) is provided at the opening of the accommodating seat (94). A stopper (96) is slidably inserted into the mounting plate (95), and the stopper (96) is an L-shaped block structure, and its end abuts against one side of the abutting plate (93).

9. The hole machining tool passivation device based on the water sandblasting process according to claim 8, characterized in that: A second airbag (97) is provided between the stopper (96) and the mounting plate (95), the second airbag (97) is communicated with the connecting pipe (83), and a return spring (98) is provided between the stopper (96) and the accommodating seat (94).

10. A method for passivating a hole machining tool based on a water sandblasting process, characterized in that: The method of use is applied to the hole machining tool passivation device based on the water sandblasting process as described in any one of claims 1 to 9, comprising the following steps: S1: insert the hole processing tool vertically between the two side clamps (75), place the tool shank in the V-shaped groove, and the drill tip is suspended toward the abutment plate (93); S2: Control the sub-motor (71) to rotate forward, drive the transmission screw (73) to rotate, the slider (74) to move, and the clamp (75) to hold the tool handle tightly; S3: At the moment when the clamping block (75) is clamped, the tool squeezes the ejector pin (82) backward, the first airbag (84) is compressed, and the gas in the first airbag (84) is injected into the second airbag (97) through the connecting pipe (83), and the second airbag (97) expands; S4: the second airbag (97) pushes the stopper (96) to move rightward, the stopper (96) is separated from the limit of the abutment plate (93), the torsion spring (92) releases the torque, the abutment plate (93) turns upward, and the abutment plate 93 presses against the drill tip; S5: The closing door is closed, the main motor (3) drives the turntable (5) to rotate, and the tool is transferred to the sandblasting station. The nozzle of the water sandblasting mechanism (6) performs sandblasting on the hole processing tool.

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