Gear hobbing machining fixing device

Abstract

This utility model belongs to the field of gear hobbing technology, specifically relating to a gear hobbing fixing device, including a frame, a fixing unit, and a limiting unit. The fixing unit is used to fix the gear to be processed; the limiting unit is used to limit the displacement of the gear to be processed, facilitating the fixing unit's fixation. The limiting unit includes a fixing plate and a limiting post. The fixing plate is fixedly connected to the frame, and the limiting post is fixedly connected to the fixing plate. The limiting post is used to place the gear to be processed. This solution solves the problem of gears easily shifting during processing.

Description

Technical Field

[0001] This utility model belongs to the field of gear hobbing technology, and specifically relates to a gear hobbing fixing device. Background Technology

[0002] In gear manufacturing, especially for high-precision gears, extremely high requirements are placed on dimensional accuracy, shape accuracy, and positional accuracy. The quality of the fixing device directly determines whether the workpiece can be accurately positioned and kept stable. Stability and rigidity: A good fixing device needs to have sufficient stability and rigidity to resist the cutting forces generated during machining, avoid vibration and deformation, and thus ensure machining quality.

[0003] Currently, an existing hobbing fixture for idler gears, with publication number CN111761143A, solves the problem that existing idler gear fixtures, when holding disc-shaped gear blanks, cannot perform hobbing operations because the clamping jaws hold the edge of the blank, hindering the hobbing operation. The hobbing fixture for idler gears includes a pressure cap; the pressure cap is inserted into the bottom end of a pressure rod. When clamping the gear blank, this device fixes it at the center position of the blank by clamping it with the pressure cap and the top cap. Therefore, when fixing disc-shaped gear blanks, the edge position of the blank is left open, not obstructing the hobbing cutter from hobbing the blank. It can adapt to the clamping and fixing of gear blanks of different shapes for hobbing operations, improving the adaptability and practicality of the device.

[0004] However, there is also a problem: during gear machining, the gears are prone to rotational deviation. Utility Model Content

[0005] This solution provides a gear hobbing fixing device to solve the problem of gears easily shifting during machining.

[0006] This solution provides a gear hobbing fixing device, including:

[0007] frame

[0008] Fixing unit: Used to fix the teeth to be processed;

[0009] Limiting unit: Used to limit the displacement of the tooth to be processed, facilitating the fixing of the fixing unit;

[0010] The limiting unit includes a fixed plate and a limiting post. The fixed plate is fixedly connected to the frame, and the limiting post is fixedly connected to the fixed plate. The limiting post is used to place the tooth to be processed.

[0011] The limiting post includes a vent rod, an air pump, an expansion sleeve, and a set screw. The vent rod is fixedly connected to the fixed plate. The expansion sleeve is sleeved on the vent rod. The vent rod has an air inlet channel. The air pump is connected to the air inlet channel. The air inlet channel has an air inlet hole and an air outlet hole. The air outlet hole is detachably fixedly connected to the set screw. The air inlet hole is connected to the expansion sleeve.

[0012] The principle of this solution is as follows: First, place the gear to be processed on the limiting post. After placement, tighten the set screw to close the air outlet. Then, start the air pump, which supplies air to the air inlet channel, causing the expansion sleeve to expand and press the gear to be processed against the limiting post.

[0013] Next, the hydraulic pump is started, causing the hydraulic cylinder to push the positioning mechanism closer to the gear and apply appropriate pressure to secure it firmly. After machining is complete, the hydraulic cylinder is reversed to release the pressure, allowing the machined gear to be removed. The operator then removes the set screw, the air intake passage returns to normal pressure, the expansion sleeve retracts, and the gear to be machined is removed.

[0014] The beneficial effects of this solution are: 1. By utilizing the stability and strong clamping force of the hydraulic system, workpiece movement can be effectively prevented even under high-speed cutting conditions, reducing vibration and improving surface quality. 2. By using an expansion sleeve to limit the movement of the gear being machined, the stability during machining is improved.

[0015] Furthermore, it also includes a sliding plug and a ventilation channel. The ventilation channel is disposed in the fixed plate. The sliding plug is slidably sealed to the ventilation channel. The air inlet channel is connected to the air pump through the ventilation channel. The diameter of the ventilation channel is larger than that of the air inlet channel.

[0016] When the air pump starts, air is supplied to the air passage, causing the sliding plug to move upwards and stop at the air inlet, increasing the pressure in the air passage and causing the expansion sleeve to expand. This mechanism limits the air pressure in the air passage by the maximum stroke that the sliding plug can move, allowing the expansion sleeve to expand to the set size.

[0017] Furthermore, the fixing unit includes a hydraulic cylinder, a positioning mechanism, and a hydraulic pump. The hydraulic cylinder and the hydraulic pump are both fixedly connected to the frame. The telescopic rod of the hydraulic cylinder is fixedly connected to the positioning mechanism. The positioning mechanism cooperates with the limiting unit. The hydraulic pump is connected to the hydraulic cylinder.

[0018] The telescopic rod is provided with an air groove, which is equipped with an air inlet pipe and an air outlet pipe. Both the air inlet pipe and the air outlet pipe are equipped with one-way valves. The air outlet pipe is aligned with the tooth to be processed. The air inlet pipe is connected to the outside. A piston is provided in the air groove. The piston is slidably and sealingly connected to the air groove. The piston cooperates with a limiting post.

[0019] The gear to be processed is fitted onto the limiting post. When the workpiece needs to be clamped, the telescopic rod moves downward, causing the vent rod to contact the piston and push the piston upward, simultaneously sealing the vent hole. The upward movement of the piston compresses the air in the air groove. As the piston moves, the pressure in the air groove increases, forcing the air to be discharged through the vent pipe and directly acting on the surface of the gear to be processed, blowing away impurities on the surface of the gear. Then, the telescopic rod presses down on the gear to be processed for fixation.

[0020] At this point, the operator starts the air pump again, causing the expansion sleeve to expand and limit the movement of the gear to be processed.

[0021] When the workpiece needs to be released, the piston retracts under the influence of gravity, creating a negative pressure in the air groove. Outside air is then replenished through the air inlet pipe, preparing for the next cycle. Simultaneously, as the air outlet is opened, the air inlet channel returns to normal pressure, the expansion sleeve retracts, and the operator can remove the gear to be processed.

[0022] This mechanism uses an air outlet to blow away impurities from the surface of the teeth to be processed, preventing inaccurate positioning due to impurities. Simultaneously, the set screw has been eliminated, and a piston is used to close and open the air outlet.

[0023] Furthermore, the positioning mechanism includes a positioning disk and positioning columns. Multiple positioning columns are provided and are arranged in a circular pattern on the positioning disk. The positioning columns are used to fix the teeth to be processed, and the air outlet pipe is located inside the positioning columns.

[0024] First, place the gear to be processed on the limiting unit, ensuring that it is roughly in the correct position; then, start the hydraulic system, causing the hydraulic cylinder to push the positioning plate towards the gear. As the positioning plate and telescopic rod move down, the limiting pin contacts the piston and pushes the piston up.

[0025] The positioning pins spray air to remove slag from the gear surface. Finally, multiple positioning pins contact the gear surface, tightly fitting the gear and maintaining stability.

[0026] After processing is completed, the hydraulic cylinder reverses its direction, the positioning plate returns to its original position, releasing the clamping force on the gear and making it easier to remove the workpiece.

[0027] The positioning pins in this design are evenly distributed around the gear, which ensures that the gear is subjected to balanced pressure from multiple directions, avoiding offset or deformation caused by uneven force at a single point.

[0028] Furthermore, it also includes a spring, one end of which is fixedly connected to the air groove and the other end of which is fixedly connected to the piston.

[0029] The hydraulic cylinder pushes the telescopic rod forward, causing the positioning mechanism to approach the gear to be processed. After the limit pin contacts the piston, it continues to apply thrust, causing the piston to compress the air in the air groove. At the same time, the spring is compressed, storing potential energy, and the air outlet pipe releases airflow to assist in clamping or cleaning.

[0030] During retraction, the hydraulic cylinder stops pushing or reverses its movement, the spring releases its compression energy, pushing the piston back to its original position, creating negative pressure in the air groove, opening the one-way valve of the air inlet pipe, and replenishing air to restore balance.

[0031] In this design, when the workpiece is released, the spring provides a restoring force, allowing the piston to quickly return to its original position, thus improving operational efficiency and reducing manual intervention.

[0032] Furthermore, the frame is provided with air holes, which are connected to ventilation channels.

[0033] During installation, align the ventilation channel of the mounting plate with the air hole on the frame, and then fix the mounting plate to the frame using threaded connections. Attached Figure Description

[0034] Figure 1 This is a structural diagram of a gear hobbing fixing device.

[0035] Figure 2 This is a cross-sectional view of a gear hobbing fixing device.

[0036] Figure 3 This is a cross-sectional view of a limiting post of a gear hobbing fixing device.

[0037] The reference numerals in the accompanying drawings include: 1. Frame; 2. Tooth to be processed; 3. Fixing plate; 4. Limiting post; 5. Positioning post; 6. Hydraulic cylinder; 7. Air outlet pipe; 8. Telescopic rod; 9. Air hole; 10. Piston; 11. Spring; 12. Air inlet pipe; 13. Positioning plate; 14. Air groove; 41. Fixing hole; 42. Sealing ring; 43. Sliding plug; 44. Expansion sleeve; 45. Rubber sealing gasket; 46. Set screw; 47. Air inlet hole; 48. Air inlet channel; 49. Vent rod; 50. Vent channel. Detailed Implementation

[0038] The basics are as follows: Figure 1 As shown:

[0039] This invention provides a fixing device for gear hobbing, which can quickly and accurately clamp gears of various specifications, thereby improving processing efficiency and quality.

[0040] Frame 1 serves as the basic support structure for the entire device, and its shape is C-shaped. It is made of high-strength cast iron or welded carbon steel, possessing good rigidity and stability, and can withstand high-frequency vibration and cutting forces. Air holes 9 on frame 1 are used for aligning and installing the limiting unit.

[0041] The fixing unit consists of three parts: a hydraulic cylinder 6, a positioning mechanism, and a hydraulic pump. The hydraulic cylinder 6 is fixedly installed on the top of the frame 1 and connected to the frame 1 by bolts. The hydraulic cylinder 6 drives the telescopic rod 8 to move up and down. The hydraulic cylinder 6 is made of aluminum alloy shell and stainless steel piston rod 10, which is corrosion resistant and has high strength.

[0042] The hydraulic pump and hydraulic cylinder 6 are connected via oil pipes. The hydraulic pump can be integrated into a CNC system for automated control. The hydraulic pump provides power to the hydraulic cylinder 6 and adjusts the clamping force.

[0043] The positioning mechanism consists of a positioning disc 13 and multiple positioning pins 5 arranged in a circular pattern. The positioning disc 13 is fixedly connected to the lower end of the telescopic rod 8 of the hydraulic cylinder 6. The material is 45 steel that has been heat-treated and chrome-plated to improve wear resistance.

[0044] The positioning pins 5 are evenly distributed on the edge of the positioning plate 13, with 6 pins in total. They are equipped with an air outlet pipe 7 inside, made of stainless steel, and have good air guiding and clamping performance.

[0045] As attached Figure 1 , Figure 2 , Figure 3 As shown:

[0046] The limiting unit consists of two parts: a fixed plate 3 and a limiting post 4. The limiting post includes a venting rod 49, an air pump, an expansion sleeve 44, and a set screw 46. The venting rod 49 is fixed on the fixed plate 3. The diameter of the venting rod 49 is smaller than that of the fixed plate 3. The expansion sleeve 44 is fitted onto the venting rod 49. The venting rod 49 has an air inlet channel 48. The air inlet channel 48 has an air inlet hole 47 and an air outlet hole. The air outlet hole is detachably fixed to the set screw 46 (or the set screw 46 can be omitted). The air inlet hole 47 is connected to the expansion sleeve 44.

[0047] The fixed plate 3 has an internal ventilation channel. The fixed plate 3 is made of cast iron or carbon steel and is precision machined. The fixed plate 3 is fixed to the frame 1 by bolts. The sliding plug 43 is slidably sealed to the ventilation channel 50. The air inlet channel 48 is connected to the air pump through the ventilation channel 50. The diameter of the ventilation channel 50 is larger than that of the air inlet channel 48.

[0048] The air groove 14 is located inside the telescopic rod 8. The opening of the air groove 14 is located at the bottom of the telescopic rod 8 and passes through the positioning plate 13, allowing the limiting post 4 to be inserted into the air groove 14. The piston 10 is slidably sealed to the groove body, and a limiting block is also provided at the lower end of the groove body to prevent the piston 10 from falling out. The groove body is provided with an air inlet pipe 12 and an air outlet pipe 7. One end of the air inlet pipe 12 is connected to an external air source, and the other end enters the air groove 14. The air outlet pipe 7 extends from the air groove 14 to the interior of each positioning post 5. The air inlet pipe 12 is equipped with a one-way valve, allowing only gas to enter. The air outlet pipe 7 is equipped with a reverse one-way valve, allowing only gas to exit.

[0049] One end of the spring 11 is fixed to the wall of the air groove 14, and the other end is connected to the piston 10. The spring 11 is made of spring 11 steel (such as 60Si2Mn), which has high elasticity and fatigue life after heat treatment.

[0050] In specific operation, the gear to be processed 2 is placed on the vent rod of the limiting post 4. The hydraulic pump is started, and the hydraulic cylinder 6 pushes the telescopic rod 8 downward. The positioning plate 13 moves down synchronously with the telescopic rod 8. As the telescopic rod 8 moves down, the limiting post 4 contacts the piston 10 and lifts the piston 10. The piston 10 moves upward under pressure, compressing the air in the air chamber. At the same time, the spring 11 is compressed and stores potential energy. Then, the compressed air enters the positioning post 5 through the air outlet pipe 7 and is ejected from its end. The ejected airflow removes impurities from the gear surface and ensures that the clamping surface is clean.

[0051] Multiple positioning pins 5 contact the gear surface, and the positioning pins 5 apply clamping force evenly. Together with the limiting pins 4, they work to achieve stable clamping.

[0052] Then, the operator starts the air pump. When the air pump starts, air is supplied to the air passage 50, and the sliding plug 43 moves upward and stops at the inlet of the air passage 48, which increases the pressure inside the air passage 48. The expansion sleeve 44 expands and presses the gear to be processed against the limiting position. The limiting post 4 restricts the rotational degree of freedom and axial movement degree of freedom of the gear.

[0053] The gear is firmly clamped, and the hob begins hobbing. After machining, the hydraulic pump stops supplying oil, the hydraulic cylinder 6 reverses direction, the spring 11 releases energy, pushing the piston 10 back to its original position, creating negative pressure in the air chamber, and the air inlet pipe 12 opens to replenish gas. The positioning mechanism rises and disengages from the gear, facilitating the removal of the workpiece. Simultaneously, because the air outlet is opened, the air inlet channel 48 returns to normal pressure, the expansion sleeve 44 retracts, and the operator can remove the gear 2 to be machined.

[0054] The beneficial effects of this plan are as follows:

[0055] 1. The combination design of 5 multi-point positioning posts and 4 limit posts provides precise centering and positioning, avoids eccentricity and tilting, and significantly improves tooth profile coaxiality and tooth pitch accuracy.

[0056] 2. Compressed air is ejected from the air outlet pipe 7 to automatically clean impurities from the gear surface before clamping, preventing clamping failure or machining errors caused by foreign objects.

[0057] 3. The limiting unit is connected to the frame 1 through the air hole 9, which facilitates the quick replacement of the adapter module according to different gear models and improves the versatility of the equipment.

[0058] 3. The expansion sleeve 44 is used to limit the movement of the gear 2 to be machined, which improves the stability during machining.

[0059] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A gear hobbing fixing device, comprising: Framework (1) Fixing unit: used to fix the teeth to be processed (2); Limiting unit: used to limit the displacement of the tooth to be processed (2) and to facilitate the fixing of the fixing unit; Its features are, The limiting unit includes a fixed plate (3) and a limiting post (4). The fixed plate (3) is fixedly connected to the frame (1), and the limiting post (4) is fixedly connected to the fixed plate (3). The limiting post (4) is used to place the tooth to be processed (2). The limiting post (4) includes a vent rod (49), an air pump, an expansion sleeve (44), and a set screw (46). The vent rod (49) is fixedly connected to the fixed plate (3). The expansion sleeve (44) is sleeved on the vent rod (49). The vent rod (49) has an air inlet channel (48). The air pump is connected to the air inlet channel (48). The air inlet channel (48) has an air inlet hole (47) and an air outlet hole. The air outlet hole is detachably fixedly connected to the set screw (46). The air inlet hole (47) is connected to the expansion sleeve (44).

2. A gear hobbing fixture according to claim 1, wherein It also includes a sliding plug (43) and a ventilation channel (50). The ventilation channel (50) is located inside the fixed plate (3). The sliding plug (43) is slidably sealed to the ventilation channel (50). The air inlet channel (48) is connected to the air pump through the ventilation channel (50). The diameter of the ventilation channel (50) is larger than that of the air inlet channel (48).

3. A gear hobbing fixture as claimed in claim 1, wherein, The fixing unit includes a hydraulic cylinder (6), a positioning mechanism and a hydraulic pump. The hydraulic cylinder (6) and the hydraulic pump are both fixedly connected to the frame (1). The telescopic rod (8) of the hydraulic cylinder (6) is fixedly connected to the positioning mechanism. The positioning mechanism cooperates with the limiting unit. The hydraulic pump is connected to the hydraulic cylinder (6). The telescopic rod (8) is provided with an air groove (14), the air groove (14) is provided with an air inlet pipe (12) and an air outlet pipe (7), both the air inlet pipe (12) and the air outlet pipe (7) are provided with one-way valves, the air outlet pipe (7) is aligned with the tooth (2) to be processed, the air inlet pipe (12) is connected to the outside, the air groove (14) is provided with a piston (10), the piston (10) is slidably sealed to the air groove (14), and the piston (10) cooperates with the limiting post (4).

4. A gear hobbing fixture as claimed in claim 3, wherein, The positioning mechanism includes a positioning disk (13) and positioning posts (5). Multiple positioning posts (5) are provided and are arranged in a circular pattern on the positioning disk (13). The positioning posts (5) are used to fix the teeth (2) to be processed. The air outlet pipe (7) is located inside the positioning posts (5).

5. A gear hobbing fixing device according to claim 3, characterized in that, It also includes a spring (11), one end of which is fixedly connected to the air groove (14) and the other end is fixedly connected to the piston (10).

6. The gear hobbing fixing device according to claim 2, characterized in that, The frame is provided with air holes (9), which are connected to the ventilation channel (50).

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