A reverse sleeve drilling machine for machining large crank forgings

Abstract

This utility model relates to a reverse-sleeving machine for machining large crank forgings, comprising: a frame, a moving beam, a rotating faceplate, a crank forging, and a sleeve drill. The crank forging is fixed below the moving beam, and the sleeve drill is fixed above the rotating faceplate. The rotating faceplate and the sleeve drill rotate to cut the crank forging, and the moving beam drives the crank forging downwards. A spring is installed inside the sleeve of the sleeve drill to support the residual material in the crank hole. During the sleeve cutting process, a uniquely designed cutter causes the chips to scatter around the sleeve drill, and the residual material in the shaft hole falls onto the spring inside the sleeve under gravity. The entire machining process achieves the purpose of convenient removal of chips and residual material in the shaft hole. This utility model has the advantages of reasonable design, simple structure, and safe and reliable machining process.

Description

Technical Field

[0001] This utility model relates to a reverse sleeve hole machine, specifically a reverse sleeve hole machine for processing large crank forgings, belonging to the field of mechanical design and manufacturing. Background Technology

[0002] Crankshafts are crankshaft components in large engines, generally very heavy, and must be forged. Due to their complex shape and manufacturing difficulty, a relatively simple forging method is usually used. The two large-diameter holes required on the blank cannot be completed during the forging process. Traditional methods use flame cutting, which has many drawbacks: firstly, high cost; secondly, the material properties are affected by localized heating of the forging, reducing its quality; thirdly, flame-cut holes are often irregular in shape, resulting in large finishing allowances and low production efficiency; and fourthly, environmental pollution. Machining is too labor-intensive, producing a large amount of waste that is difficult to remove. Traditional lathes and milling machines cannot solve these problems; therefore, further optimization of traditional equipment and production processes is necessary. Summary of the Invention

[0003] To address the problems raised in the background technology, this utility model provides a reverse sleeve hole machine for machining large crank forgings. The crank forging is fixed on the moving beam of the sleeve hole machine and fed downwards. A special sleeve hole cutter is fixed on the rotating disc of the sleeve hole machine, so that the machining process can automatically remove chips and residual material in the shaft hole, achieving the purpose of smooth sleeve hole.

[0004] To achieve the above objectives, this utility model proposes a reverse hole-drilling machine for machining large crank forgings, comprising: a frame, a moving beam, a rotating faceplate, a crank forging, and a hole-drilling tool. The moving beam is mounted on the frame and can move forward, backward, left, right, and up and down on the frame. The rotating faceplate is located below the moving beam. Its distinguishing feature is:

[0005] The crank forging is fixed below the moving beam, and the bushing drill is fixed above the rotating faceplate. The bushing drill is aligned with the central axis of the rotating faceplate. The rotating faceplate and the bushing drill rotate to cut the crank forging, and the moving beam drives the crank forging to feed downward.

[0006] The drilling tool includes a sleeve, a cutting head, and a spring;

[0007] The cutting head is fixed to the upper end of the sleeve;

[0008] The spring is disposed inside the sleeve and carries the remaining material in the shaft hole of the crank forging;

[0009] The lower end of the sleeve is provided with a connecting member, which is fixedly connected to the rotating flower disc.

[0010] Furthermore, if we set the inner cavity height of the sleeve to H, the natural length of the spring to L, the minimum compression of the spring to ΔX, and the remaining material height of the shaft hole to S, then: H>S+L-ΔX.

[0011] Preferably, the maximum spring force is 1.1-1.3 times the weight of the remaining material in the shaft hole.

[0012] Preferably, the connecting member is a flange.

[0013] Preferably, the connecting member is a claw.

[0014] This utility model is a special sleeve drilling machine for machining large shaft holes in crank forgings. The large crank forging is clamped on a moving beam and fed downwards. The special sleeve drilling tool is fixed on a rotating face. During the sleeve cutting process, the uniquely designed cutter causes the chips to scatter around the sleeve drilling tool. The remaining material in the shaft hole falls onto the spring inside the sleeve under the action of gravity. The entire processing process achieves the purpose of convenient removal of chips and remaining material in the shaft hole.

[0015] This utility model has the advantages of reasonable design, simple structure, and safe and reliable processing. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the main sectional view of the crank forging shaft hole before machining.

[0017] Appendix Figure 2 This is a schematic diagram of the main section structure of the crank forging shaft hole after machining.

[0018] In the attached diagram, 1 is the moving beam, 2 is the crank forging, 3 is the rotating disc, 4 is the hole drill bit, 5 is the spring, 6 is the clamping component, 7 is the pad block, and 8 is the remaining material of the shaft hole. Detailed Implementation

[0019] As attached Figure 1 , 2 As shown, the crank forging 2 is fixed to the bottom of the moving beam 1 by the clamping mechanism 6, and a pad 7 of a certain thickness is set between the crank forging 2 and the moving beam 1. The sleeve drill 4 is fixed on the rotating disc 3 and rotates with the rotating disc 3 to cut the crank forging 2. The moving beam 1 drives the crank forging 2 to feed downward. Its cutting chips fall off by itself under the action of gravity, overcoming the disadvantage that the chips generated by the traditional horizontal and vertical cutting cannot be removed. When the cutting head on the sleeve drill 4 penetrates the crank forging 2, the cutting head is in the space formed by the pad 7.

[0020] As attached Figure 2As shown, when the shaft hole on the crank forging 2 is spun through, the cutting chips are scattered around the sleeve of the sleeve drill 4, and the cut cylindrical shaft hole residue 8 falls onto the spring 5 inside the sleeve of the sleeve drill 4. The spring 5 carries the two shaft hole residues 8 of the two crank forgings 2. The heavier shaft hole residue 8 can fall stably onto the spring 5, overcoming the disadvantage of the traditional machining process where the shaft hole residue 8 is difficult to remove.

Claims

1. A reverse reaming machine for large crank forging machining, comprising: The machine comprises a frame, a moving beam, a rotating disc, a crank forging, and a drilling tool. The moving beam is mounted on the frame and can move forward, backward, left, right, and up and down on the frame. The rotating disc is located below the moving beam. The machine is characterized by: The crank forging is fixed below the moving beam, and the bushing drill is fixed above the rotating faceplate. The bushing drill is aligned with the central axis of the rotating faceplate. The rotating faceplate and the bushing drill rotate to cut the crank forging, and the moving beam drives the crank forging to feed downward. The drilling tool includes a sleeve, a cutting head, and a spring; The cutting head is fixed to the upper end of the sleeve; The spring is disposed inside the sleeve and carries the remaining material in the shaft hole of the crank forging; The lower end of the sleeve is provided with a connecting member, which is fixedly connected to the rotating flower disc.

2. A reverse broaching machine for large crank forging machining according to claim 1, characterized in that: Let the inner cavity height of the sleeve be H, the natural length of the spring be L, the minimum compression of the spring be ΔX, and the remaining material height of the shaft hole be S. Then: H>S+L-ΔX.

3. A reverse broaching machine for large crank forging machining according to claim 1, characterized in that: The maximum spring force is 1.1-1.3 times the weight of the remaining material in the shaft hole.

4. A reverse broaching machine for large crank forging machining according to claim 1, characterized in that: The connecting component is a flange.

5. A reverse broaching machine for large crank forging machining according to claim 1, characterized in that: The connecting component is a chuck.

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