Special tool for machining key groove of transmission wheel

Abstract

The utility model discloses a special tool for processing a key groove of a transmission wheel, which comprises a clamping device, a special cutter bar, a transmission nut, a special key groove milling cutter and a transmission device, a screw rod at one end of the special cutter bar penetrates through a central hole of the transmission wheel to be processed, the transmission nut is screwed on the screw rod, and the transmission nut is propped against one side of a mounting plate through a plane bearing; a stepped blind hole is formed in the center of the other end of the special cutter bar, cross-shaped grooves which are equal in width and penetrate through the axial center of the stepped blind hole are further formed in the other end of the special cutter bar, the special key groove milling cutter is connected with one end of the transmission device, and the special key groove milling cutter and the transmission device are embedded into the cross-shaped grooves. The transmission wheel keyway milling device is compact in structure and convenient to use, and solves the problem of milling the transmission wheel keyway in an occasion lacking a special machine tool.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cutting machining tool of disc type parts, especially a kind of machining tool, without using any machine tool, just need to provide cutting power with hand drill, can complete the machining tool of disc-shaped part keyway processing ， It belongs to the technical field of metal cutting. BACKGROUND

[0002] Disc transmission parts such as pulley, sprocket, gear and worm wheel are generally fixedly connected with shaft by using key, so keyway must be machined before the aforementioned disc transmission parts are installed. The cutting machining of keyway generally uses slotter or planer. When ship equipment needs to replace transmission wheel, the lathe of ship itself can complete the cutting machining of pulley shape and center hole, but it cannot carry out the cutting machining of keyway due to lack of special equipment, which leads to the equipment unable to replace pulley and affects the normal work of ship equipment. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a kind of transmission wheel keyway processing special tool, solve the problem of temporarily completing disc type part keyway processing on site.

[0004] The utility model is realized by the following technical solutions:

[0005] A kind of transmission wheel keyway processing special tool, including clamping device, special tool bar, transmission nut, special keyway milling cutter and transmission device, the clamping device includes L-shaped base, mounting plate and a pair of right angle pressing plate, L-shaped base bottom is fixed on workbench, vertically arranged mounting plate lower part is fixedly connected with L-shaped base upper part;The transmission wheel to be processed is positioned on mounting plate by positioning pin fixed on the side of mounting plate, the radial outer edge of the transmission wheel to be processed is fixed on mounting plate by the right angle pressing plate that is symmetrically arranged and the included angle α with horizontal line is 40 °-50 °;The screw rod of one end of special tool bar passes through the center hole of the transmission wheel to be processed, transmission nut is screwed on the screw rod, transmission nut is abutted on the side of mounting plate by plane bearing;The other end of special tool bar is provided with stepped blind hole in the center, the other end of special tool bar is also provided with cross slot that is equal in width and passes through the axial center of stepped blind hole, special keyway milling cutter is connected with one end of transmission device, special keyway milling cutter and transmission device are embedded in the cross slot.

[0006] The purpose of the utility model can also be further realized by the following technical measures.

[0007] Furthermore, the transmission device includes a drive gear, an intermediate gear, a working gear, a drive shaft, and an intermediate gear shaft. The drive gear is fixed to the middle of the drive shaft, the intermediate gear is fixed to the middle of the intermediate gear shaft, and the working gear is fixed to the middle of a dedicated keyway milling cutter. The milling head of the dedicated keyway milling cutter extends out of the outer circumference of the dedicated guide rod. The two ends of the shank of the dedicated keyway milling cutter, the two ends of the intermediate gear shaft, and the two ends of the drive shaft are sequentially embedded in the first groove of the cross groove, and are respectively in clearance fit with the first groove. The working gear, intermediate gear, and drive gear, which mesh sequentially, are embedded in the second groove of the cross groove, and are respectively in clearance fit with the second groove. The dedicated keyway milling cutter is adjacent to the transmission wheel to be machined.

[0008] Furthermore, the end screw at the other end of the special tool holder is locked by a lock nut, and the drive shaft is limited by a washer on the side of the lock nut facing the drive shaft, and the locking sleeve is embedded in the outer end hole of the stepped blind hole.

[0009] Furthermore, the drive shaft has a stepped shaft structure, with both ends extending outwards from the outer circumference of the dedicated tool holder. The drill chuck of the pistol drill clamps the small end of the stepped shaft. The relationship between the distance L from the center of the pistol drill to the axis of the dedicated keyway end mill, half the thickness of the pistol drill (B / 2), half the diameter of the dedicated keyway end mill (D / 2), and the thickness C of the transmission wheel to be machined is: L + D / 2 - B / 2 = C + 5mm.

[0010] Furthermore, one end of the guide pin is fixed in the wall of the central through hole of the mounting plate, and the other end of the guide pin extends into the screw guide groove at one end of the special tool bar.

[0011] Furthermore, the end faces of both ends of the intermediate gear shaft and the end face of the shank of the special keyway milling cutter are respectively 0.5 to 1.0 mm lower than the outer circumference of the special tool holder.

[0012] Furthermore, the cutting edge height H of the special keyway end mill is greater than the keyway height H1 of the transmission wheel to be machined, where H - H1 = 1.3 to 1.7 mm.

[0013] This invention eliminates the need for a slotting machine or planer; a hand drill provides power, and the dedicated keyway milling cutter is driven to rotate through the sequential meshing of the drive gear, intermediate gear, and working gear within a special tool holder. By turning the transmission nut, the cutter is fed to the cutting position, thus completing the machining of the keyway in the transmission wheel. This invention features a compact structure and ease of use, solving the problem of keyway milling in situations where dedicated machine tools are unavailable.

[0014] The advantages and features of this utility model will be illustrated and explained through the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. 。 Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention;

[0016] Figure 2 yes Figure 1 The left view;

[0017] Figure 3 yes Figure 1 AA section view;

[0018] Figure 4 This is an enlarged view of the end face of the other end of the special tool holder. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments of machining keyways on pulleys using the present invention.

[0020] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "inner," and "outer," which indicate orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and do not indicate or imply that the device referred to must have a specific orientation. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figures 1-4 As shown, this embodiment includes a clamping device 1, a special tool holder 2, a transmission nut 3, a special keyway milling cutter 4, and a transmission device 5. The clamping device 1 includes an L-shaped base 11, a mounting plate 12, and a pair of right-angle pressure plates 13. The bottom of the L-shaped base 11 is fixed to the worktable 20 by two sets of bolt and nut sets 111. The lower part of the vertically arranged mounting plate 12 is diagonally fixed to the upper part of the L-shaped base 11 by two screws 121. The left end face of the transmission wheel 10 to be processed is positioned on the mounting plate 12 by a positioning pin 14 fixed on the right side of the mounting plate 12. The radial outer edge of the transmission wheel 10 to be processed is fixed to the mounting plate 12 by symmetrically arranged right-angle pressure plates 13. One end of the right-angle pressure plate 13 is symmetrically fixed to the outer edge of the mounting plate 12 by screws 121 at an angle α = 45° with the horizontal line, and the other end is symmetrically pressed against the outer edge of the end face of the mounting plate 12 by screws 121.

[0022] The screw 21 at the left end of the special tool holder 2 passes through the center hole 101 of the transmission wheel to be machined. The transmission nut 3 is screwed onto the screw 21 and rests against the left side of the mounting plate 12 via the plane bearing 6. The right end of the special tool holder 2 has a stepped blind hole 22 at its center, and the right end of the special tool holder 2 also has a cross groove 23 of equal width that passes through the axial center of the stepped blind hole 22.

[0023] The transmission device 5 includes a drive gear 51, an intermediate gear 52, a working gear 53, a drive shaft 54, and an intermediate gear shaft 55. The drive gear 51 is fixed to the middle of the drive shaft 54, the intermediate gear 52 is fixed to the middle of the intermediate gear shaft 55, and the working gear 53 is fixed to the middle of the dedicated keyway milling cutter 4. The milling head 41 of the dedicated keyway milling cutter 4 extends upward beyond the outer circumference of the dedicated guide rod 2. The two ends of the shank 42 of the dedicated keyway milling cutter 4, the two ends of the intermediate gear shaft 55, and the two ends of the drive shaft 54 ​​are sequentially embedded in the first groove 231 of the cross groove 23, and are respectively clearance-fitted with the first groove 231. The working gear 53, the intermediate gear 52, and the drive gear 51, which mesh sequentially, are embedded in the second groove 232 of the cross groove 23, and are respectively clearance-fitted with the second groove 232.

[0024] The end screw 23 at the right end of the special tool holder 2 is locked by a lock nut 24. A washer 55 limits the drive shaft 54 ​​on the left side of the lock nut 24 facing the drive shaft 54. The locking sleeve 25 is embedded in the outer end hole 221 of the stepped blind hole 22. The rigidity of the end screw 23 is reduced due to the cross groove 23 on the right end of the special tool holder 2. The use of the lock nut 24 and the locking sleeve 25 can effectively improve the rigidity of the right end of the special tool holder 2, ensuring that the transmission device 5 can work normally.

[0025] The drive shaft 54 ​​has a stepped shaft structure, with both ends of the drive shaft 52 extending out of the outer circumference of the dedicated tool holder 2. The drill chuck 71 of the pistol drill 7 clamps the small end 541 of the stepped shaft. One end of the guide pin 15 is fixed in the wall of the central through hole 121 of the mounting plate, and the other end of the guide pin 15 extends into the screw guide groove 211 on the lower side of one end of the dedicated tool holder 2, providing precise guidance for the feed of the dedicated keyway milling cutter 4 and effectively preventing the dedicated tool holder 2 from rotating.

[0026] The relationship between the distance L from the center of the pistol drill 7 to the axis of the dedicated keyway end mill 4, half the thickness of the pistol drill B / 2, half the diameter of the dedicated keyway end mill D / 2, and the thickness C of the transmission wheel to be machined is: L+D / 2-B / 2=C+5mm. This ensures that when the dedicated keyway end mill 4 is feeding and milling, the pistol drill 7 will not interfere with the transmission wheel 10 to be machined.

[0027] The end faces of both ends of the intermediate gear shaft 55 and the end face of the shank 42 of the special keyway end mill 4 are 0.75 mm lower than the outer circumference of the special tool holder 2. The cutting edge height H of the special keyway end mill 4 is greater than the keyway height H1 of the transmission wheel to be machined, and H - H1 = 1.5 mm.

[0028] The usage process of this utility model is as follows:

[0029] 1) Press the drive shaft 54 ​​into the center hole of the drive gear 51, press the intermediate gear shaft 55 into the center hole of the intermediate gear 52, and press the shank of the special keyway milling cutter 4 into the center hole of the working gear 53, so that the drive gear 51, the intermediate gear 52 and the special keyway milling cutter 4 are fixed to the middle of the drive shaft 54, the middle of the intermediate gear shaft 55 and the middle of the special keyway milling cutter 4 respectively by interference fit, thus completing the component assembly of the transmission device 5.

[0030] 2) Fix the lower part of the vertically mounted mounting plate 12 to the upper part of the L-shaped base 11, and then fix the bottom of the L-shaped base 11 to the worktable 20. Next, fix one end of the guide pin 15 in the hole wall of the center hole 122 of the mounting plate. Then, position the transmission wheel 10 to be processed on the left side of the mounting plate 12 by the positioning pin 14. Then, fix the transmission wheel 10 to be processed on both sides of the mounting plate 12 by the right angle pressure plates 13, thereby completing the positioning and clamping of the transmission wheel 10 to be processed.

[0031] 3) Pass the left end of the special tool holder 2 through the center hole 101 of the transmission wheel to be machined and the center hole 122 of the mounting plate in sequence, and embed one end of the guide pin of the hole wall of the center hole 122 of the mounting plate into the screw guide groove 211. Then install the plane bearing 6 on the right end of the special tool holder 2, so that the right side of the plane bearing 6 abuts against the left side of the mounting plate 12. Then screw the transmission nut 3 onto the special tool holder screw 21, and make the right side of the transmission nut 3 abut against the left side of the plane bearing 6, thereby installing the left end of the special tool holder 2 into the center hole 122 of the mounting plate.

[0032] 4) Insert the two ends of the keyway milling cutter 4, the two ends of the intermediate gear shaft 55, and the two ends of the drive shaft 54 ​​into the first groove 231 of the cross groove 23 on the left end of the special keyway milling cutter 2, with the milling cutter head 41 of the special keyway milling cutter 4 extending beyond the outer circumference of the special guide rod 2. At the same time, the working gear 53, the intermediate gear 52, and the driving gear 51 are also inserted into the second groove 232 of the cross groove 23 in sequence, and the working gear 52, the intermediate gear 53, and the driving gear 54 mesh in sequence. Then, insert the locking sleeve 25 into the outer end hole 221 of the stepped blind hole 22 of the special keyway milling cutter 2, put on the washer 55, and then tighten the locking nut 24 on the right end of the special keyway milling cutter 2 to limit the drive shaft 54. Next, use a hook wrench to turn the transmission nut 3 to adjust the distance A between the milling cutter head 41 of the special keyway milling cutter 4 and the adjacent surface of the transmission wheel 10 to be machined, so that A = 1.0 mm, completing the installation and adjustment of the transmission device 5.

[0033] 5) First, clamp the chuck 71 of the pistol drill 7 onto the small end of the drive shaft 54. Then, the operator holds the pistol drill 7 with their right hand and presses the pistol drill switch. The drive shaft 54 ​​rotates, the drive gear 51 rotates, and the intermediate gear 52 drives the working gear 53 to rotate, causing the special keyway cutter 4 to rotate. Next, the operator holds the hook wrench with their left hand and turns the transmission nut 3 clockwise, causing the special tool holder 2 to move to the left in the direction of the transmission nut 3. The special keyway cutter 4 feeds towards the direction of the transmission nut 3 while rotating to cut the keyway of the transmission wheel until the special keyway cutter 4 moves to the left out of the center hole 101 of the transmission wheel, completing the cutting of the keyway of the transmission wheel.

[0034] 6) The operator releases the switch of the pistol drill, the drive shaft 54 ​​stops rotating, and the special keyway end mill 4 also stops rotating. Then, the drill chuck 71 of the pistol drill 7 is released, the pistol drill 7 is removed, and the drive shaft 54 ​​is unloaded. Next, the operator holds a hook wrench and turns the transmission nut 3 counterclockwise, causing the special tool holder 2 to move to the right away from the transmission nut 3, until the special keyway end mill 4 exits the center hole 101 of the transmission wheel. Then, the locking nut 24 is unscrewed in sequence, the locking sleeve 25 is removed, and then the drive gear 51, intermediate gear 52 and working gear 53 are removed in sequence to complete the disassembly of the transmission device 5; finally, the right-angle pressure plate 13 is removed, and the completed transmission wheel 10 is taken out.

[0035] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A special tooling for machining keyways on a transmission wheel, comprising a clamping device, the clamping device including an L-shaped base, a mounting plate, and a pair of right-angle pressure plates, wherein the bottom of the L-shaped base is fixed to a worktable, and the lower part of the vertically arranged mounting plate is fixedly connected to the upper part of the L-shaped base; one side of the transmission wheel to be machined is positioned on the mounting plate by a locating pin fixed to one side of the mounting plate, and the radial outer edge of the transmission wheel to be machined is fixed on the mounting plate by right-angle pressure plates symmetrically arranged and forming an angle α of 40° to 50° with the horizontal line; characterized in that: It also includes a special tool holder, a transmission nut, a special keyway milling cutter, and a transmission device. The screw at one end of the special tool holder passes through the center hole of the transmission wheel to be machined, and the transmission nut abuts against one side of the mounting plate through a plane bearing. The other end of the special tool holder has a stepped blind hole at its center, and the other end of the special tool holder also has a cross groove of equal width that passes through the axial center of the stepped blind hole. The special keyway milling cutter is connected to one end of the transmission device, and the special keyway milling cutter and the transmission device are embedded in the cross groove.

2. The special tooling for machining the keyway of the transmission wheel as described in claim 1, characterized in that: The transmission device includes a drive gear, an intermediate gear, a working gear, a drive shaft, and an intermediate gear shaft. The drive gear is fixed to the middle of the drive shaft, the intermediate gear is fixed to the middle of the intermediate gear shaft, and the working gear is fixed to the middle of a dedicated keyway milling cutter. The milling head of the dedicated keyway milling cutter extends out of the outer circumference of the dedicated cutter shank. The two ends of the cutter shank, the two ends of the intermediate gear shaft, and the two ends of the drive shaft are sequentially embedded in the first groove of the cross groove, and are respectively clearance-fitted with the first groove. The working gear, intermediate gear, and drive gear, which mesh sequentially, are embedded in the second groove of the cross groove, and are respectively clearance-fitted with the second groove. The dedicated keyway milling cutter is adjacent to the transmission wheel to be machined.

3. The special tooling for machining the keyway of the transmission wheel as described in claim 2, characterized in that: The end screw at the other end of the special tool holder is locked by a lock nut. The lock nut is positioned on the side facing the drive shaft by a washer to limit the drive shaft. The locking sleeve is embedded in the outer end hole of the stepped blind hole.

4. The special tooling for machining the keyway of the transmission wheel as described in claim 2, characterized in that: The drive shaft is a stepped shaft structure, with both ends of the drive shaft extending out of the outer circumference of the dedicated tool holder. The drill chuck of the pistol drill clamps the small end of the stepped shaft. The relationship between the distance L from the center of the pistol drill to the axis of the dedicated keyway end mill, half the thickness of the pistol drill B / 2, half the diameter of the dedicated keyway end mill D / 2, and the thickness C of the transmission wheel to be processed is: L+D / 2-B / 2=C+5mm.

5. The special tooling for machining the keyway of the transmission wheel as described in claim 1, characterized in that: One end of the guide pin is vertically fixed in the wall of the central through hole of the mounting plate, and the other end of the guide pin extends into the screw guide groove on the lower side of one end of the special tool bar.

6. The special tooling for machining the keyway of the transmission wheel as described in claim 2, characterized in that: The end faces of both ends of the intermediate gear shaft and the end face of the shank of the special keyway milling cutter are 0.5 to 1.0 mm lower than the outer circumference of the special tool holder.

7. The special tooling for machining the keyway of the transmission wheel as described in claim 2, characterized in that: The cutting edge height H of the special keyway end mill is greater than the keyway height H1 of the transmission wheel to be machined, where H - H1 = 1.3 to 1.7 mm.

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