Internal rotary cutter for machining universal joint

Abstract

The invention discloses an internal rotary cutter for universal joint machining, and relates to the technical field of machining, the internal rotary cutter comprises a main shaft and further comprises an inner cavity cutting mechanism, the inner cavity cutting mechanism is arranged at the power output end of the main shaft, and the inner cavity cutting mechanism comprises a connecting seat fixedly connected with the power output end of the main shaft; a connecting piece is fixedly connected to the bottom end of the connecting base, a cutter bar is fixedly connected to the bottom end of the connecting piece, a cutter head is fixedly connected to the bottom end of the cutter bar, a distance adjusting blade is arranged in the cutter bar, a second guide groove is formed in the surface of the distance adjusting blade, and a second guide block is fixedly connected to the interior of the cutter bar; and the second guide block is slidably connected with the interior of the second guide groove, a first guide block is fixedly connected with the interior of the cutter bar, and a pushing column is arranged in the cutter bar, so that the problems that in a machining mode, procedures are redundant, consumed time is long, and the overall structural strength of the universal joint is reduced are solved.

Description

An internal rotary cutter for universal joint machining Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to an internal rotary cutter for machining universal joints. Background Technology

[0002] A universal joint, also known as a universal connector, is a mechanical component that enables power transmission at varying angles. It is used in locations where the direction of the drive shaft needs to be changed. The internal rotary cutter for universal joint machining is a specialized rotary cutting device designed for the special machining needs of the universal joint's internal cavity. It completes the machining of the universal joint's internal cavities, ensuring the structural integrity and performance of the universal joint.

[0003] Because the internal cavity and the opening of the universal joint have different diameters, especially when the internal cavity diameter is larger than the opening diameter, in order to process the universal joint, it is usually necessary to process the two half-cavity components separately first, and then complete the overall splicing through welding. This processing method is not only redundant and time-consuming, but also prone to stress concentration at the weld joint, which causes the overall structural strength of the universal joint to decrease and affects the processing quality of the universal joint. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide an internal rotary cutter for universal joint machining, so as to solve the problems of redundant processing steps, long processing time, and weakening of the overall structural strength of the universal joint.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] An internal rotary cutter for universal joint machining includes a spindle and an internal cavity cutting mechanism. The internal cavity cutting mechanism is located at the power output end of the spindle. The internal cavity cutting mechanism includes a connecting seat fixedly connected to the power output end of the spindle. A connecting piece is fixedly connected to the bottom end of the connecting seat. A tool holder is fixedly connected to the bottom end of the connecting piece. A cutter head is fixedly connected to the bottom end of the tool holder. An adjustable blade is provided inside the tool holder. A second guide groove is formed on the surface of the adjustable blade. A second guide block is fixedly connected inside the tool holder. The second guide block is slidably connected to the inside of the second guide groove.

[0007] Furthermore, a first guide block is fixedly connected inside the tool holder, a push column is provided inside the tool holder, a first guide groove is formed on the surface of the push column, the first guide block is slidably connected to the inside of the first guide groove, a first screw is rotatably connected inside the tool holder, the bottom end of the first screw is threaded into the inside of the push column, and a rotating block is fixedly connected to the top end of the first screw.

[0008] Furthermore, a first spring is fixedly connected inside the second guide groove, and the two first springs are respectively fixedly connected to the two second guide blocks.

[0009] Furthermore, it also includes a chip removal mechanism, which is disposed inside the tool holder. The chip removal mechanism includes a chip removal groove formed inside the tool holder, and two spiral bands are disposed inside the chip removal groove. The two spiral bands have opposite thread directions. A fixed drive sleeve is fixedly connected to the bottom end of the spindle. Two suspension brackets are fixedly connected to the bottom end of the spindle. A rotating shaft is rotatably inserted into the bottom end of each of the two suspension brackets. A transmission gear is fixedly connected to the bottom end of each of the two rotating shafts. The two transmission gears mesh with each other. A drive wheel is fixedly connected to the top end of one of the rotating shafts. The drive wheel is in contact with the inner arc surface of the fixed drive sleeve.

[0010] Furthermore, it also includes a grinding mechanism disposed on the surface of the tool holder, the grinding mechanism including a cutting ring sleeved on the surface of the tool holder, the lower surface of the cutting ring having cutting teeth.

[0011] Furthermore, multiple rotating rods are rotatably inserted inside the cutting ring, and drive blades are fixedly connected to the ends of the multiple rotating rods that are far apart from each other. A frame is fixedly connected to the upper surface of the cutting ring, and a sliding protrusion is fixedly connected to the inner arc surface of the cutting ring. A third guide groove is opened on the surface of the blade bar, and the sliding protrusion is slidably connected to the interior of the third guide groove.

[0012] Furthermore, a pry bar is fixedly connected to the surface of the rotating rod, a lower pressure plate is slidably connected inside the frame, a second screw is threaded into the inside of the lower pressure plate, and the bottom end of the second screw is rotatably connected to the inside of the cutting ring.

[0013] Furthermore, a spiral spring is fixedly sleeved on the surface of the rotating rod, and a connecting column is fixedly connected inside the frame, with the outer end of the spiral spring fixedly connected to the connecting column.

[0014] Furthermore, a guide rod is inserted inside the cutting ring, and a grinding disc is fixedly connected to the bottom end of the guide rod.

[0015] Furthermore, a connecting plate is fixedly connected to the top end of the guide rod, and a second spring is fixedly connected between the connecting plate and the cutting ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) This scheme generates centrifugal force by driving the spindle to rotate the tool bar at high speed, which causes the two adjustable blades to gradually cut the inside of the universal joint, so that the universal joint has an internal cavity diameter larger than the opening diameter, and the structure of the universal joint is kept intact, thus improving the machining quality of the universal joint.

[0018] (2) During the cutting process, the chips generated by this solution will enter the opening at the bottom of the chip removal groove, and then be carried out by the rotating spiral belt. This prevents the chips from staying inside the universal joint for a long time, which would cause wear outside the processing range inside the universal joint, thereby improving the processing quality of the universal joint.

[0019] (3) The thrust generated by the gas flow in this scheme can make the cutting ring contact the opening of the universal joint, and the cutting ring rotating at high speed can cut off the protruding burrs with the help of the cutting teeth. After the burrs are cut off, the grinding disc passes over the cutting part and grinds the cutting part, so that the end of the universal joint remains flat. The processing quality of the universal joint can be maintained without subsequent burr removal and grinding.

[0020] (4) When removing burrs on the universal joint, the second screw can be rotated to move the lower pressure plate, so that the lower pressure plate presses against the pry bar and the drive blade rotates. The tilt angle of the drive blade can be adjusted to prevent the speed from being too fast, resulting in excessive pressure or the universal joint material strength being too low, which would cause the end wear to exceed expectations. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the structure of the present invention;

[0022] Figure 2 is a structural schematic diagram of the universal joint part of the present invention;

[0023] Figure 3 is a schematic diagram of the tool holder part of the present invention;

[0024] Figure 4 is a schematic diagram of the internal structure of the tool holder of the present invention;

[0025] Figure 5 is a schematic diagram of the adjustable blade part of the present invention;

[0026] Figure 6 is a structural schematic diagram of the connecting seat portion of the present invention;

[0027] Figure 7 is a schematic diagram of the internal structure of the chip removal groove of the present invention;

[0028] Figure 8 is a schematic diagram of the spiral ribbon portion of the present invention;

[0029] Figure 9 is a schematic diagram of the structure of the cutting ring portion of the present invention;

[0030] Figure 10 is an enlarged view of point A in Figure 9 of this invention;

[0031] Figure 11 is a schematic diagram of the structure of the drive blade part of the present invention.

[0032] Explanation of the labels in the diagram:

[0033] 1. Spindle;

[0034] 201. Tool holder; 202. Tool head; 203. Connecting piece; 204. Adjustable blade; 205. Connecting seat; 206. Rotating block; 207. First screw; 208. Propulsion column; 209. First guide block; 210. First guide groove; 211. First spring; 212. Second guide block; 213. Second guide groove;

[0035] 301. Suspension bracket; 302. Drive wheel; 303. Spiral belt; 304. Transmission gear; 305. Shaft; 306. Chip removal groove; 307. Fixed drive sleeve;

[0036] 401. Lower pressure plate; 402. Third guide groove; 403. Cutting ring; 404. Frame; 405. Second screw; 406. Cutting tooth; 407. Sliding protrusion; 408. Drive blade; 409. Rotating rod; 410. Connecting plate; 411. Guide rod; 412. Grinding disc; 413. Second spring; 414. Pry bar; 415. Scroll spring; 416. Connecting column. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please refer to Figures 1-5. An internal rotary cutter for universal joint machining includes a spindle 1 and an internal cavity cutting mechanism. The internal cavity cutting mechanism is located at the power output end of the spindle 1. The internal cavity cutting mechanism includes a connecting seat 205 fixedly connected to the power output end of the spindle 1. A connecting piece 203 is fixedly connected to the bottom end of the connecting seat 205. A tool holder 201 is fixedly connected to the bottom end of the connecting piece 203. A cutter head 202 is fixedly connected to the bottom end of the tool holder 201. An adjustable blade 204 is provided inside the tool holder 201. A second guide groove 213 is formed on the surface of the adjustable blade 204. A second guide block 212 is fixedly connected inside the tool holder 201. The second guide block 212 is slidably connected to the inside of the second guide groove 213.

[0039] The tool holder 201 is internally fixedly connected to a first guide block 209. A push column 208 is internally provided in the tool holder 201. A first guide groove 210 is formed on the surface of the push column 208. The first guide block 209 is slidably connected to the first guide groove 210. A first screw 207 is rotatably connected internally in the tool holder 201. The bottom end of the first screw 207 is threaded into the inside of the push column 208. A rotating block 206 is fixedly connected to the top end of the first screw 207. A first spring 211 is fixedly connected internally in the second guide groove 213. Two first springs 211 are respectively fixedly connected to two second guide blocks 212.

[0040] By adopting the above technical solution, when processing the universal joint, the universal joint must first be fixed. Then, the spindle 1 can drive the tool holder 201 and the cutter head 202 to rotate, allowing the cutter head 202 to perform rotary cutting on the universal joint, drilling into the interior of the universal joint. After the cutter head 202 has entered the universal joint to a specified depth, the tool holder 201 stops rotating. The operator uses tools such as pliers to rotate the rotating block 206, which in turn drives the first screw 207 to rotate. This causes the first screw 207 to push the push column 208 downward. During the downward movement of the push column 208, the bottom end of the push column 208 can be inserted between the two adjustable blades 204, allowing the two adjustable blades 204 to... By moving the blades 204 away from each other, the two adjusting blades 204 extend out of the tool holder 201. Simultaneously, the adjusting blades 204 are tightly pressed against the inner wall of the universal joint, shallowly embedded in the smooth inner wall, creating a cutting edge. Then, the spindle 1 drives the tool holder 201 to rotate at high speed, generating centrifugal force that causes the two adjusting blades 204 to move away from each other. This combination of the cutting edge and the high-speed rotation generates a large centrifugal force, which overcomes the tension of the first spring 211 and gradually cuts into the interior of the universal joint. This results in a structure where the internal cavity diameter is larger than the opening diameter, while maintaining the integrity of the universal joint structure and improving its machining quality.

[0041] After the universal joint is machined, the first screw 207 is rotated in the opposite direction to pull the push column 208 out from between the two adjusting blades 204. At the same time, when the tool bar 201 stops rotating, the centrifugal force disappears, and the first spring 211 can pull the adjusting blade 204 back to the tool bar 201. This controls the spindle 1 to pull the tool bar 201 and the tool head 202 out of the universal joint.

[0042] As shown in Figures 3, 6, 7, and 8, the system also includes a chip removal mechanism. This mechanism is located inside the tool holder 201 and includes a chip removal groove 306 formed within the tool holder 201. Two spiral bands 303 are arranged inside the chip removal groove 306, with opposite thread directions. The edges of the spiral bands 303 are coated with a wear-resistant alloy to reduce frictional wear against the inner wall of the chip removal groove 306. A fixed drive sleeve 307 is fixedly connected to the bottom end of the spindle 1. Two suspension brackets 301 are fixedly connected to the bottom end of the spindle 1, and a rotating shaft 305 is rotatably inserted into the bottom end of each suspension bracket 301. A miniature sealed bearing is provided at the connection between shaft 305 and suspension bracket 301 to prevent cutting fluid and chips from entering the bearing and causing jamming. The bottom ends of both shafts 305 are fixedly connected to transmission gears 304, which mesh with each other. The top end of one of the shafts 305 is fixedly connected to a drive wheel 302, which fits against the inner arc surface of the fixed drive sleeve 307. The drive wheel 302 is made of rubber with a high coefficient of friction, and its diameter is slightly larger than the pitch circle diameter of the transmission gear 304 to ensure that the linear velocity matches when in contact with the fixed drive sleeve 307, thus ensuring that the spiral belt 303 has sufficient chip removal speed.

[0043] By adopting the above technical solution, chips are generated during the cutting process of the universal joint. These chips enter the opening at the bottom of the chip removal groove 306. At the same time, during the rotation of the tool holder 201, the drive wheel 302 rolls on the inner wall of the fixed drive sleeve 307, thereby driving the two transmission gears 304 to rotate and the two spiral belts 303 to rotate. This allows the rotating spiral belts 303 to carry the chips out after they enter the chip removal groove 306, preventing the chips from remaining inside the universal joint for a long time and causing wear outside the machining range, thus improving the machining quality of the universal joint.

[0044] As shown in Figures 2, 9, 10, and 11, the device also includes a grinding mechanism disposed on the surface of the tool holder 201. The grinding mechanism includes a cutting ring 403 sleeved on the surface of the tool holder 201. The lower surface of the cutting ring 403 has cutting teeth 406. Multiple rotating rods 409 are rotatably inserted inside the cutting ring 403. Drive blades 408 are fixedly connected to the ends of the multiple rotating rods 409 that are far apart from each other. A frame 404 is fixedly connected to the upper surface of the cutting ring 403. A sliding protrusion 407 is fixedly connected to the inner arc surface of the frame 404 and the cutting ring 403. A third guide groove 402 is formed on the surface of the tool holder 201. The sliding protrusion 407 slides into the inner arc surface of the third guide groove 402. The rotating rod 409 is fixedly connected to a pry bar 414. A lower pressure plate 401 is slidably connected inside the frame 404. A second screw 405 is threaded into the lower pressure plate 401. The bottom end of the second screw 405 is rotatably connected to the inside of the cutting ring 403. A spiral spring 415 is fixedly sleeved on the surface of the rotating rod 409. A connecting post 416 is fixedly connected inside the frame 404. The outer ring end of the spiral spring 415 is fixedly connected to the connecting post 416. The spiral spring 415, which has a large elastic coefficient, can ensure that the pry bar 414 is always in contact with the lower surface of the lower pressure plate 401, so that the drive blade 408 can remain stable at any angle without being subjected to a huge external force.

[0045] The cutting ring 403 has a guide rod 411 inserted inside. A grinding disc 412 is fixedly connected to the bottom end of the guide rod 411, and a connecting plate 410 is fixedly connected to the top end of the guide rod 411. A second spring 413 is fixedly connected between the connecting plate 410 and the cutting ring 403. The second spring 413 can keep the grinding disc 412 in contact with the end of the universal joint to provide the pressure required for grinding.

[0046] By adopting the above technical solution, when the cutter head 202 drills into the universal joint, the universal joint material undergoes plastic deformation and tearing under the action of cutting force, rather than being completely cut off. Burrs will be generated at the opening of the universal joint. During the rotation of the cutter bar 201, the cutting ring 403 and the drive blade 408 will rotate. The thrust generated by the gas flow can make the cutting ring 403 apply a thrust towards the universal joint until the cutting ring 403 contacts the opening of the universal joint. The high-speed rotating cutting ring 403 can cut off the protruding burrs with the help of the cutting teeth 406. After the burrs are removed, the grinding disc 412 passes over the cut-off part and can grind the cut-off part to keep the end of the universal joint flat. The processing quality of the universal joint can be maintained without subsequent burr removal and grinding.

[0047] When removing burrs from the universal joint, the lower pressure plate 401 can be moved by rotating the second screw 405. The lower pressure plate 401 presses down on the pry bar 414 while the drive blade 408 rotates. The tilt angle of the drive blade 408 can be adjusted to prevent excessive speed from causing excessive pressure or excessively low strength of the universal joint material, which would lead to excessive wear at the end.

[0048] Instructions for use: First, secure the universal joint.

[0049] Subsequently, the spindle 1 can drive the tool holder 201 and the tool head 202 to rotate, and the tool head 202 can be used to rotate and cut the universal joint, so that the tool head 202 can drill into the interior of the universal joint.

[0050] Subsequently, the cutter bar 201 stopped rotating, and the staff used pliers and other tools to rotate the rotating block 206, so that the bottom end of the push column 208 was inserted between the two adjusting blades 204, and the two adjusting blades 204 were extended out of the cutter bar 201.

[0051] Subsequently, the spindle 1 drives the cutter bar 201 to rotate at high speed again, so that the adjustable blade 204 cuts the inside of the universal joint by combining the cutting edge and the huge centrifugal force generated by the high-speed rotation.

[0052] During the rotation of the tool holder 201, the drive wheel 302 drives the two spiral belts 303 to rotate. After the chips enter the chip discharge groove 306, the rotating spiral belts 303 carry the chips out.

[0053] After the cutter head 202 drills into the universal joint and stops rotating, the lower pressure plate 401 can be moved by rotating the second screw 405 to adjust the tilt angle of the drive blade 408.

[0054] Subsequently, the rotation of the cutter bar 201 will drive the cutting ring 403 and the drive blade 408 to rotate. The cutting ring 403 contacts the opening of the universal joint, which can cut off the protruding burrs.

[0055] After the burrs are removed, the grinding disc 412 passes over the removed area to grind the removed area, keeping the end of the universal joint flat.

[0056] After the universal joint is machined, the first screw 207 is rotated in the reverse direction to pull the push column 208 out from between the two adjustable blades 204, which can control the spindle 1 to pull the tool holder 201 and the tool head 202 out of the universal joint.

[0057] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. An internal rotary cutter for universal joint machining, comprising a spindle (1), characterized in that: It also includes an internal cavity cutting mechanism, which is located at the power output end of the main shaft (1). The internal cavity cutting mechanism includes a connecting seat (205) fixedly connected to the power output end of the main shaft (1). A connecting piece (203) is fixedly connected to the bottom end of the connecting seat (205). A tool holder (201) is fixedly connected to the bottom end of the connecting piece (203). A tool head (202) is fixedly connected to the bottom end of the tool holder (201). An adjustable blade (204) is provided inside the tool holder (201). A second guide groove (213) is opened on the surface of the adjustable blade (204). A second guide block (212) is fixedly connected inside the tool holder (201). The second guide block (212) is internally slidably connected to the second guide groove (213); it also includes a chip removal mechanism, which is disposed inside the tool holder (201). The chip removal mechanism includes a chip removal groove (306) opened inside the tool holder (201). Two spiral belts (303) are disposed inside the chip removal groove (306). A fixed drive sleeve (307) is fixedly connected to the bottom end of the spindle (1). Two suspension brackets (301) are fixedly connected to the bottom end of the spindle (1). A rotating shaft (305) is rotatably inserted at the bottom end of each of the two suspension brackets (301). A drive wheel (302) is fixedly connected to the top end of one of the rotating shafts (305).

2. The internal rotary cutter for universal joint machining according to claim 1, characterized in that: The tool holder (201) is internally fixedly connected to a first guide block (209), and the tool holder (201) is internally provided with a push column (208). The surface of the push column (208) is provided with a first guide groove (210). The first guide block (209) is internally slidably connected to the first guide groove (210). The tool holder (201) is internally rotatably connected to a first screw (207). The bottom end of the first screw (207) is threaded into the inside of the push column (208). The top end of the first screw (207) is fixedly connected to a rotating block (206).

3. The internal rotary cutter for universal joint machining according to claim 1, characterized in that: The second guide groove (213) is fixedly connected to a first spring (211), and the two first springs (211) are respectively fixedly connected to the two second guide blocks (212).

4. The internal rotary cutter for universal joint machining according to claim 1, characterized in that: The two spiral belts (303) have opposite thread directions, and the bottom ends of the two rotating shafts (305) are fixedly connected with transmission gears (304). The two transmission gears (304) mesh with each other, and the drive wheel (302) is in contact with the inner arc surface of the fixed drive sleeve (307).

5. The internal rotary cutter for universal joint machining according to claim 1, characterized in that: It also includes a grinding mechanism, which is disposed on the surface of the tool holder (201). The grinding mechanism includes a cutting ring (403) sleeved on the surface of the tool holder (201), and the lower surface of the cutting ring (403) is provided with cutting teeth (406).

6. The internal rotary cutter for universal joint machining according to claim 5, characterized in that: Multiple rotating rods (409) are rotatably inserted inside the cutting ring (403). Each of the multiple rotating rods (409) has a drive blade (408) fixedly connected to one end away from the other. A frame (404) is fixedly connected to the upper surface of the cutting ring (403). A sliding protrusion (407) is fixedly connected to the inner arc surface of the frame (404) and the cutting ring (403). A third guide groove (402) is opened on the surface of the cutter bar (201). The sliding protrusion (407) is slidably connected to the interior of the third guide groove (402).

7. The internal rotary cutter for universal joint machining according to claim 6, characterized in that: A pry bar (414) is fixedly connected to the surface of the rotating rod (409), and a lower pressure plate (401) is slidably connected inside the frame (404). A second screw (405) is threaded into the inside of the lower pressure plate (401), and the bottom end of the second screw (405) is rotatably connected to the inside of the cutting ring (403).

8. The internal rotary cutter for universal joint machining according to claim 7, characterized in that: A spiral spring (415) is fixedly sleeved on the surface of the rotating rod (409), and a connecting column (416) is fixedly connected inside the frame (404). The outer ring end of the spiral spring (415) is fixedly connected to the connecting column (416).

9. An internal rotary cutter for universal joint machining according to claim 5, characterized in that: A guide rod (411) is inserted inside the cutting ring (403), and a grinding disc (412) is fixedly connected to the bottom end of the guide rod (411).

10. An internal rotary cutter for universal joint machining according to claim 9, characterized in that: A connecting plate (410) is fixedly connected to the top of the guide rod (411), and a second spring (413) is fixedly connected between the connecting plate (410) and the cutting ring (403).

Images