A replaceable body gear hob

Abstract

The utility model relates to a gear hob with replaceable cutter body, including cutter shaft, cutter shaft centre is provided with the axle hole, the outer wall of cutter shaft is provided with a plurality of evenly distributed sliding slots, a plurality of L type mounting seats are slidably installed in the sliding slot, the vertical surface of L type mounting seat is provided with the installation slot, and the horizontal surface is provided with the bottom groove, and both are mutually connected, the cutter body is embedded on the installation slot and the bottom groove, the keyway is set up in the joint of installation slot and cutter body, the flat key is inserted in the two keyways, the cutter holder is arranged on both ends of the sliding slot, adopting the above structure, when the cutter body is damaged in the working process, the cutter holder of the similar one end can be disassembled, the L type mounting seat and the cutter body are drawn out along the cutter shaft axis direction, the replaced cutter body and L type mounting seat are assembled, the cutter body is put back in the sliding slot along the cutter shaft axis direction in turn, finally the cutter holder is installed at the original position, compared with the prior art, when the cutter is damaged, it is not necessary to replace the whole, only partial replacement can be carried out, and the cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to a gear hob, and more particularly to a gear hob with a replaceable tool body applied in the field of machining tool technology. Background Technology

[0002] A gear hob is a precision cutting tool used to machine involute gears (such as spur gears, helical gears, worm gears, etc.) on a gear hobbing machine. It is one of the most critical and widely used cutting tools in gear manufacturing, especially in mass production and high-efficiency manufacturing. Its working principle is based on the meshing principle of spatially interlocked helical gears.

[0003] Chinese utility model patent CN208162785U discloses an alloy gear hob with a replaceable cutter body. The device includes a cutter shaft and a second fixing block. The cutter shaft has a shaft hole at its center and a keyway on the inner wall of the shaft hole. A groove is provided on the outer surface of the cutter shaft, and a cutter body is slidably installed in the groove. Ten cutting teeth are evenly arranged on the cutter body. A first fixing block is welded to one end of the cutter body. A first screw hole is provided on one end face of the cutter shaft. The first fixing block is fixed to the end face of the cutter shaft by a first screw engaging with the first screw hole and the second screw hole.

[0004] In the above technical solution, if a single tooth on the blade is damaged, the entire blade needs to be disassembled for repair and replacement, which increases the overall cost of use. Utility Model Content

[0005] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that when a cutting tool is damaged, replacing the entire cutting tool body is inconvenient and costly.

[0006] To solve the above problems, this utility model provides a replaceable gear hob, including a cutter shaft with a shaft hole at its center. Multiple evenly distributed sliding grooves are formed on the outer wall of the cutter shaft. Multiple L-shaped mounting seats are slidably installed within the sliding grooves. Each L-shaped mounting seat has a mounting groove on its vertical surface and a bottom groove on its horizontal surface, and the two are interconnected. A cutter body is embedded in both the mounting groove and the bottom groove. Keyways are formed at the contact points between the inner wall of the mounting groove and the cutter body. A flat key is inserted into each of the two keyways. Cutter clips are provided at both ends of the sliding groove and are connected to the sliding groove by countersunk screws. The multiple L-shaped mounting seats abut against each other in pairs, and the cutter clips abut against adjacent L-shaped mounting seats.

[0007] In the aforementioned replaceable gear hob, if the cutter body is damaged during operation, the cutter holder at the nearest end can be disassembled, and the L-shaped mounting base and cutter body can be pulled out along the cutter shaft axis. The replaced cutter body and L-shaped mounting base can be assembled, and then the cutter body can be put back in sequence along the cutter shaft axis. Finally, the cutter holder can be installed in its original position. The replacement method is simple and quick, and the usage cost is low.

[0008] As a further improvement of this application, the height of the L-shaped mounting base is lower than the height of the cutter body, and the length of the upper edge of the horizontal section of the L-shaped mounting base is greater than the length of the cutter body.

[0009] As a further improvement of this application, both the slide and the tool holder are right-angled trapezoids, and the inner walls of the tool holder and the slide fit together.

[0010] As a further improvement of this application, the upper half of the mounting groove is V-shaped, and the lower half of the mounting groove is rectangular.

[0011] As another improvement of this application, a fixing block is also placed in the bottom groove, and the fixing block is in contact with both the blade body and the vertical inner wall of the bottom groove. The end of the fixing block facing the blade body has an inner groove, and a pressure sensor is fixedly installed on the inner wall of the inner groove. The detection end of the pressure sensor is fixedly connected to an elastic rod, and a baffle is fixedly connected to the end of the elastic rod away from the pressure sensor. The baffle abuts against the blade body.

[0012] As a further improvement to this application, a limiting block is also placed in the bottom groove. The upper surface of the limiting block is coated with a fluorescent layer. The upper end of the limiting block extends to the outside of the cutter shaft and is flush with the surface of the cutter shaft. An L-shaped baffle is fixedly connected to the end of the limiting block away from the cutter body. The vertical section of the L-shaped baffle is an elastic structure. The horizontal surface of the L-shaped baffle completely covers the fluorescent layer, and the edge of the L-shaped baffle away from the vertical section is flush with the fluorescent layer. The length of the lower edge of the horizontal section of the L-shaped baffle is equal to the length of the fluorescent layer.

[0013] In summary, when the tool body is damaged during operation, the tool holder at the nearest end can be disassembled, and the L-shaped mounting base and the tool body can be pulled out along the tool shaft axis. The replaced tool body and L-shaped mounting base can be assembled, and then the tool body can be placed back into the slide groove along the tool shaft axis. Finally, the tool holder can be installed in its original position. When the tool is damaged, there is no need to replace the whole tool; only a part needs to be replaced, which effectively reduces costs. Attached Figure Description

[0014] Figure 1 This is a perspective view of the first embodiment of this application; Figure 2 This is an exploded view of the L-shaped mounting base and the blade body according to the first embodiment of this application; Figure 3 This is a cross-sectional view of the L-shaped mounting base and the blade body according to the first embodiment of this application; Figure 4 This is a cross-sectional view of the L-shaped mounting base and the blade body according to the second embodiment of this application; Figure 5 This is a cross-sectional view of the second embodiment of this application; Figure 6 This is a cross-sectional view of the third embodiment of this application.

[0015] Explanation of the labels in the diagram: 1. Cutter shaft, 2. Shaft hole, 3. Slide groove, 4. L-shaped mounting base, 401. Mounting groove, 402. Bottom groove, 403. Flat key, 5. Cutter body, 6. Countersunk screw, 7. Cutter clip, 8. Fixing block, 801. Inner groove, 802. Pressure sensor, 803. Elastic rod, 804. Baffle, 9. Limiting block, 10. L-shaped baffle. Detailed Implementation

[0016] The following describes in detail the various embodiments of this application with reference to the accompanying drawings.

[0017] Implementation method 1: Figure 1-3 The device includes a cutter shaft 1 with a shaft hole 2 at its center. Multiple evenly distributed grooves 3 are formed on the outer wall of the cutter shaft 1. Multiple L-shaped mounting seats 4 are slidably installed within the grooves 3. Each L-shaped mounting seat 4 has a mounting groove 401 on its vertical surface and a bottom groove 402 on its horizontal surface, with the two communicating with each other. A cutter body 5 is embedded in both the mounting groove 401 and the bottom groove 402. Keyways are formed at the contact points between the inner wall of the mounting groove 401 and the cutter body 5. A flat key 403 is inserted into both keyways to further limit and fix the cutter body 5. Cutter clips 7 are provided at both ends of the groove 3, and are fixedly connected to the groove 3 by countersunk screws 6. The cutter clips 7 limit the mounting seats 4 and the cutter body 5 within the groove 3 in the axial direction of the cutter shaft 1, improving the overall stability of the device. The multiple L-shaped mounting seats 4 abut against each other, and the cutter clips 7 abut against adjacent L-shaped mounting seats 4.

[0018] Figure 2 As shown, the height of the L-shaped mounting base 4 is lower than the height of the blade body 5, and the length of the upper edge of the horizontal section of the L-shaped mounting base 4 is greater than the length of the blade body 5, so that the blade body 5 can be vertically inserted from the end of the bottom groove 402 away from the mounting groove 401, and then pushed towards the mounting groove 401 to realize the installation of the blade body 5.

[0019] Figure 1 As shown, both the slide groove 3 and the tool holder 7 are right-angled trapezoids, and the inner walls of the tool holder 7 and the slide groove 3 are in contact. The right-angled trapezoidal structure restricts the movement of the mounting base 4 in the radial direction of the tool shaft 1, so that the mounting base 4 is stably fixed inside the slide groove 3.

[0020] Figure 2 As shown, the upper half of the mounting groove 401 is V-shaped, and the lower half of the mounting groove 401 is rectangular. The mounting groove 401 distributes the cutting force on the cutter body 5 to countless tooth contact points, reducing the pressure per unit area and effectively extending the service life of the cutter body 5.

[0021] Working principle: When the cutter body 5 of the gear hob is damaged, the cutter clip 7 on the adjacent side is removed, and then the L-shaped mounting base 4 is pushed out along the axis of the cutter shaft 1. The cutter body 5 is slid out in a direction away from the mounting groove 401, and then the cutter body 5 is taken out and replaced along the direction perpendicular to the bottom groove 402. The replaced cutter body 5 is installed in the mounting groove 401 in the reverse manner of removal. Then, the L-shaped mounting base 4 is pushed into the slide groove 3 in sequence along the axis of the cutter shaft 1. Finally, the cutter clip 7 is installed in its original position. Compared with the overall replacement method in the prior art, this solution realizes the individual replacement of the cutter body 5. The overall installation method is quick and the structure is simple. The individual replacement of the cutter body 5 makes the consumption cost of the gear hob lower.

[0022] The second implementation method: Figure 4-5 As shown, a fixing block 8 is also placed in the bottom groove 402, and the fixing block 8 is in contact with both the cutter body 5 and the vertical inner wall of the bottom groove 402. The end of the fixing block 8 facing the cutter body 5 has an inner groove 801. A pressure sensor 802 is fixedly installed on the inner wall of the inner groove 801. Those skilled in the art can select a suitable model of pressure sensor 802 according to actual needs, such as an LSB205 sensor. An elastic rod 803 is fixedly connected to the detection end of the pressure sensor 802. A baffle 804 is fixedly connected to the end of the elastic rod 803 away from the pressure sensor 802. The baffle 804 abuts against the cutter body 5. During the operation of the gear hob, when the cutter body 5 and the mounting seat 4 have a gap due to wear, the pressure on the elastic rod 803 decreases and it extends slightly, causing the pressure parameter displayed by the pressure sensor 802 to decrease. The worker can then repair or replace the corresponding cutter body 5 and mounting seat 4.

[0023] Compared with Example 1, the installation of the fixing block 8 can improve the stability of the tool body 5 installation. The installation of the pressure sensor 802 can detect the loosening of the tool body 5 in real time during use, reducing the possibility of errors in the precision of the machined gears due to the loosening of the tool body 5.

[0024] The third implementation method: Figure 6As shown, a limiting block 9 is used instead of the fixing block 8 in the second embodiment. The upper surface of the limiting block 9 is coated with a fluorescent layer. The upper end of the limiting block 9 extends to the outside of the cutter shaft 1 and is flush with the surface of the cutter shaft 1. An L-shaped baffle 10 is fixedly connected to the end of the limiting block 9 away from the cutter body 5. The vertical section of the L-shaped baffle 10 is an elastic structure and is in a compressed state during operation. The horizontal surface of the L-shaped baffle 10 completely covers the fluorescent layer, and the edge of the L-shaped baffle 10 away from the vertical section is flush with the fluorescent layer. The length of the lower edge of the horizontal section of the L-shaped baffle 10 is equal to the length of the fluorescent layer. When wear occurs at the connection between the cutter body 5 and the mounting base 4, creating a gap, the pressure on the L-shaped baffle 10 decreases and it can lengthen slightly, pushing the limiting block 9 to move. This exposes the fluorescent layer on the upper surface of the limiting block 9 to the outside of the L-shaped baffle, making it easy for workers to visually see the fluorescent color during regular maintenance and to repair or replace the corresponding cutter body 5 and mounting base 4.

[0025] Compared with Example 2, the structure using a combination of a fluorescent layer and an L-shaped baffle 10 eliminates the need for an electrical structure, enabling the device to periodically monitor its usage while simplifying the structure and reducing the overall operating cost.

[0026] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A gear hob with a replaceable cutter body, comprising a cutter shaft (1), characterized in that: The cutter shaft (1) has a shaft hole (2) at its center. The outer wall of the cutter shaft (1) has multiple evenly distributed sliding grooves (3). Multiple L-shaped mounting seats (4) are slidably installed in the sliding grooves (3). The L-shaped mounting seats (4) have mounting grooves (401) on their vertical surfaces and bottom grooves (402) on their horizontal surfaces. The two are connected to each other. The cutting body (5) is embedded in both the mounting grooves (401) and the bottom grooves (402). Keyways are provided at the joint between the inner wall of the mounting groove (401) and the cutting body (5). A flat key (403) is inserted in both keyways. A cutting clip (7) is provided at both ends of the sliding groove (3). The cutting clip (7) is fixedly connected to the sliding groove (3) by countersunk screws (6). The multiple L-shaped mounting seats (4) abut against each other in pairs. The cutting clip (7) abuts against the adjacent L-shaped mounting seat (4).

2. The gear hob with a replaceable cutter body according to claim 1, characterized in that: The height of the L-shaped mounting base (4) is lower than the height of the blade body (5), and the length of the upper edge of the horizontal section of the L-shaped mounting base (4) is greater than the length of the blade body (5).

3. A gear hob with a replaceable cutter body according to claim 1, characterized in that: The slide (3) and the blade clamp (7) are both right-angled trapezoids, and the inner walls of the blade clamp (7) and the slide (3) are in contact.

4. A gear hob with a replaceable cutter body according to claim 1, characterized in that: The upper half of the mounting groove (401) is V-shaped, and the lower half of the mounting groove (401) is rectangular.

5. A gear hob with a replaceable cutter body according to claim 1, characterized in that: A fixing block (8) is also placed in the bottom groove (402). The fixing block (8) is in contact with both the blade body (5) and the vertical inner wall of the bottom groove (402). The end of the fixing block (8) facing the blade body (5) has an inner groove (801). A pressure sensor (802) is fixedly installed on the inner wall of the inner groove (801). An elastic rod (803) is fixedly connected to the detection end of the pressure sensor (802). A baffle (804) is fixedly connected to the end of the elastic rod (803) away from the pressure sensor (802). The baffle (804) abuts against the blade body (5).

6. A gear hob with a replaceable cutter body according to claim 1, characterized in that: A limiting block (9) is also placed in the bottom groove (402). The upper surface of the limiting block (9) is coated with a fluorescent layer. The upper end of the limiting block (9) extends to the outside of the cutter shaft (1) and is flush with the surface of the cutter shaft (1). An L-shaped baffle (10) is fixedly connected to the end of the limiting block (9) away from the cutter body (5). The vertical section of the L-shaped baffle (10) is an elastic structure. The horizontal surface of the L-shaped baffle (10) completely covers the fluorescent layer. The edge of the L-shaped baffle (10) away from the vertical section is flush with the fluorescent layer. The length of the lower edge of the horizontal section of the L-shaped baffle (10) is equal to the length of the fluorescent layer.

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