A bushing machining process

Abstract

The application discloses a bushing processing technology, which comprises the steps of feeding, forming, cutting and chamfering, first cutting, polishing chamfering and second cutting. The application can produce two bushings at a time through the above steps, greatly improving the production efficiency of the bushings. The Z-shaped rack rod is arranged, the time for the rack rod and the tool holder to enter and exit the working position is shortened, the forming tool and the drill rod can be processed at the same time, the step part arranged on the drill rod can polish the chamfer at the front end opening of the first bushing at the same time of drilling the center through hole, the optimization of each step is realized, the efficiency of the bushing production is improved, the flange on the outer circumferential surface of the bushing is preferentially formed, the positioning is realized through the position of the flange in the subsequent processing step, and the precision of the inner side chamfer processing of the bushing is ensured when the two bushings are processed at the same time.

Description

Technical Field

[0001] This invention belongs to the field of bushing processing technology, and particularly relates to a bushing processing technology. Background Technology

[0002] When existing machine tools produce bushings, the bushing structure is as follows: Figure 1 As shown, the bushing 1 includes two annular flanges 2 circumferentially distributed on the outer periphery of both ends, a coaxially opened central through hole 3, and chamfers 4 at the openings at both ends of the central hole. The production process of machining the above-mentioned bushing structure typically includes the following steps: 1. The blank is fed out from the machine tool outlet, and the length of the blank is determined by a stop bar; 2. A central through hole is drilled in the blank using a flat drill; 3. A chamfer is ground at the opening at the front end of the central hole using a self-grinding drill bit; 4. Two annular flanges are cut on the outer circumferential surface of the blank using a forming cutter; 5. A chamfer is ground at the opening at the end of the central through hole using a hook cutter, so that the bushing is finally formed; 6. The formed bushing is cut off from the blank using a lathe tool.

[0003] However, when processing bushings using the above process, the entry and exit of each tool takes a long time, and only one bushing can be produced at a time, resulting in low efficiency. Therefore, a bushing processing technology is needed to improve production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a bushing processing technology to solve the technical problem that existing processes can only produce one bushing at a time, resulting in low production efficiency.

[0005] To solve the above-mentioned technical problems, the specific technical solution of the bushing processing technology of the present invention is as follows:

[0006] A bushing manufacturing process includes the following steps:

[0007] S1: Feeding. The cylindrical billet is fed from the machine tool outlet to the front end where it abuts against the stop bar. Then the machine tool fixes the billet to determine the length of the billet.

[0008] S2: Forming. The forming blade cuts on the outer circumferential surface of the blank to form four annular flanges distributed around the circumference of the blank, simultaneously forming the outer surfaces of the two bushings. The drill rod drills a central through hole in the blank, and at the same time grinds the opening at the front end of the central through hole to form a chamfer at the front end opening of the first bushing.

[0009] S3: Chamfering: Insert the first hook into the central through hole and grind the chamfer of the first bushing end opening on the inner wall of the central through hole;

[0010] S4: Cut off in one go, using a lathe tool to cut the first bushing off the blank from the side;

[0011] S5: Chamfering: Insert the second hook into the center through hole and simultaneously chamfer the front opening and the end opening of the second bushing.

[0012] S6: Secondary cutting, the second bushing is cut off from the blank from the side using a lathe tool.

[0013] Preferably, in order to improve the production efficiency of the bushing, the forming cutter cuts the annular flange and the drill rod drills the central through hole simultaneously in step S2.

[0014] Preferably, in order to prevent damage to the second bushing when cutting the first bushing, a gap is provided between the two middle annular flanges of the four annular flanges in step S2, and the width of the gap is the same as the width of the cutting tool in step S4.

[0015] Preferably, in order to reduce the time consumed when the stop bar enters and exits, the stop bar in step S1 has a Z-shaped structure, the front end face of the stop bar abuts against the front end face of the blank, and the end of the stop bar is connected to the cutter holder.

[0016] Preferably, in order to simultaneously machine the chamfer of the central through hole and the front opening of the first bushing, the drill rod in step S2 is provided with a stepped portion, which is a conical structure, and the stepped portion is used to grind the chamfer of the front opening of the first bushing.

[0017] Preferably, in order to process the chamfer at the end of the first bushing, the front end of the first hook cutter in step S3 is provided with a chamfered part, the chamfered part including two V-shaped grinding surfaces, the grinding surfaces being used to grind the chamfer at the end of the first bushing.

[0018] Preferably, in order to simultaneously process the chamfer of the front opening and the end opening of the second bushing, the side of the front end of the second hook knife in step S5 is provided with a concave portion. The width of the concave portion decreases from its opening to the bottom, so that the two sides of the concave portion form inclined surfaces. The two inclined surfaces are grinding surfaces, which are used to grind the chamfer of the front opening and the end opening of the second bushing.

[0019] The bushing processing technology of the present invention has the following advantages: by going through the steps of feeding, forming, cutting and chamfering, first cutting, grinding and chamfering and second cutting, two bushings can be produced at one time, which improves the efficiency of bushing production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the bushing structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the blank and the stop bar in step S1 of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the blank, forming blade and drill rod in step S2 of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the blank and the first hook knife in step S3 of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the blank and the cutting tool in step S4 of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the blank and the second hook knife in step S5 of the present invention;

[0026] Figure 7 This is a schematic diagram of the structure of the blank and the cutting tool in step S6 of the present invention;

[0027] The markings in the diagram are as follows: 1. Bushing; 2. Flange; 3. Center through hole; 4. Chamfer; 5. Machine tool; 6. Blank; 101. Stop bar; 201. Drill rod; 202. Stepped part; 301. Forming cutter; 401. First hook cutter; 402. Chamfered part; 501. Lathe tool; 601. Second hook cutter; 602. Concave part. Detailed Implementation

[0028] To better understand the purpose, structure, and function of this invention, a bushing processing technology of this invention will be described in further detail below with reference to the accompanying drawings.

[0029] like Figure 2-7 As shown, a bushing manufacturing process includes the following steps:

[0030] S1: Feeding, the columnar billet 6 is fed from the outlet of the machine tool 5 to the front end to abut against the stop bar 101. Then the machine tool 5 fixes the billet 6 to determine the length of the billet 6. The stop bar 101 has a Z-shaped structure.

[0031] In this step, the machine tool 5 outputs and fixes the blank 6, and can also drive the fixed blank 6 to rotate to process the blank 6. The front end face of the stop rod 101 abuts against the front end face of the blank 6 to determine the output length of the blank 6. The end of the stop rod 101 is connected to the tool holder, which is installed on the machine tool. By moving the tool holder, the stop rod 101 can be controlled to enter and exit the working position radially along the blank 6. Compared with the existing straight stop rod 101, the tool holder of the stop rod 101 is larger in volume, and the tool holder needs to move a large range to make both the stop rod 101 and the tool holder exit the working position, which is convenient for subsequent tool processing. The tool holder connected to the Z-shaped stop rod 101 can be set off from the blank 6, and the two can always maintain a large distance. This allows the tool holder to enter and exit the stop rod 101 with only a small range of movement, which greatly reduces the time spent moving the stop rod 101 and improves production efficiency.

[0032] S2: Forming. The forming cutter 301 cuts four annular flanges 2 around the circumference of the blank 6. There is a gap between the two annular flanges in the middle. The width of the gap is the same as the width of the cutting tool in step S4. The outer surfaces of the two bushings 1 are formed simultaneously. The drill rod 201 drills a central through hole 3 on the blank 6. At the same time, the chamfer 4 of the front opening of the first bushing 1 is formed by grinding at the front opening of the central through hole 3. The forming cutter 301 cuts the annular flanges 2 and the drill rod 201 drills the central through hole 3 at the same time. The drill rod 201 is provided with a step part 202. The step part 202 is a conical structure. The step part 202 is used to grind the chamfer 4 of the front opening of the first bushing 1.

[0033] In this step, the forming cutter 301 cuts the blank 6 from the side, and the drill rod 201 drills holes in the blank along the axis. The two processes do not interfere with each other and can be carried out simultaneously to improve processing efficiency. Furthermore, the stepped part 202 can grind the chamfer 4 of the front opening of the first bushing 1 while drilling the central through hole 3, which further improves processing efficiency. At the same time, four flanges 2 are first machined on the surface of the blank 6 to form the outer surface of the bushing 1, which helps to position the bushing 1 by the position of the flanges 2 during subsequent steps to improve processing accuracy.

[0034] S3: Cutting the chamfer, the first hook 401 is inserted into the central through hole 3 and the chamfer 4 of the opening at the end of the first bushing 1 is ground on the inner wall of the central through hole 3. The front end of the first hook 401 is provided with a chamfer part 402, which includes two grinding surfaces distributed in a V shape. The grinding surfaces are used to grind the chamfer 4 at the end of the first bushing 1.

[0035] S4: Cut off in one go, using the lathe tool 501 to cut the first bushing 1 from the blank 6 from the side;

[0036] S5: Grinding and chamfering. The second hook 601 is inserted into the central through hole 3 to grind the chamfer 4 of the front opening and the chamfer 4 of the end opening of the second bushing 1. The side of the front end of the second hook 601 is provided with a concave part 602. The width of the concave part 602 decreases from its opening to the bottom, so that the two sides of the concave part 602 form a slope. The two slopes are grinding surfaces. The grinding surfaces are used to grind the chamfer 4 of the front opening and the chamfer 4 of the end opening of the second bushing 1.

[0037] S6: Secondary cutting, the second bushing 1 is cut off from the blank 6 from the side using the lathe tool 501.

[0038] Compared with existing bushing processing technology, the above process can produce two bushings 1 in one go through the same steps, which greatly improves production efficiency. The Z-shaped stop bar 101 shortens the time for the stop bar 101 and its tool holder to enter and exit the working position. The forming tool 301 and the drill rod 201 can be processed simultaneously. At the same time, the stepped part 202 on the drill rod 201 can grind the chamfer at the front opening of the first bushing 1 while drilling the central through hole 3. This optimizes each step, improves the production efficiency of bushing 1, and prioritizes the forming of the flange 2 on the outer circumference of the bushing 1. In subsequent processing steps, the position of the flange can be used for positioning, ensuring the accuracy of the inner chamfer 4 of the bushing when the two bushings are processed at the same time.

[0039] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A bushing processing technology, characterized in that, Includes the following steps: S1: Feeding. The cylindrical billet is fed from the machine tool outlet to the front end where it abuts against the stop bar. Then the machine tool fixes the billet to determine the length of the billet. S2: Forming. The forming blade cuts on the outer circumferential surface of the blank to form four annular flanges distributed around the circumference of the blank, simultaneously forming the outer surfaces of the two bushings. The drill rod drills a central through hole in the blank, and at the same time grinds the opening at the front end of the central through hole to form a chamfer at the front end opening of the first bushing. S3: Chamfering: Insert the first hook into the central through hole and grind the chamfer of the first bushing end opening on the inner wall of the central through hole; S4: One-time cut-off, the first bushing is cut off from the blank from the side using a lathe tool; S5: Chamfering: Insert the second hook into the center through hole and simultaneously chamfer the front opening and the end opening of the second bushing. S6: Secondary cutting, the second bushing is cut off from the blank from the side using a lathe tool; The stop bar in step S1 has a Z-shaped structure, the front end face of the stop bar abuts against the front end face of the blank, and the end of the stop bar is connected to the cutter holder. The drill rod in step S2 is provided with a stepped section, which is a conical structure and is used to grind the chamfer of the front opening of the first bushing. The front end of the first hook knife in step S3 is provided with a chamfered part, the chamfered part includes two grinding surfaces distributed in a V shape, the grinding surfaces are used to grind the chamfer at the end of the first bushing; In step S5, the side of the front end of the second hook knife is provided with a concave portion. The width of the concave portion decreases from its opening to the bottom, so that the two sides of the concave portion form inclined surfaces. The two inclined surfaces are grinding surfaces, which are used to grind the chamfer of the front opening and the end opening of the second bushing.

2. The bushing processing technology according to claim 1, characterized in that, In step S2, the forming tool cuts the annular flange and the drill rod drills the central through hole simultaneously.

3. The bushing processing technology according to claim 1, characterized in that, In step S2, among the four annular flanges, there is a gap between the two middle annular flanges, and the width of the gap is the same as the width of the cutting tool in step S4.

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