Combined crank neck rough turning tool
By designing a combined crankshaft and neck roughing tooling, the main and auxiliary chucks clamp the two wings of the crankshaft forging, enabling the roughing of the crank neck to be completed in one clamping. This solves the problems of environmental pollution, safety hazards, and low efficiency in the machining of large engine crankshafts, improves machining efficiency and precision, and reduces costs.
Patent Information
- Application Number
- CN202520634278.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-03
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-04-03
AI Technical Summary
The existing technology for machining large engine crankshafts and crankpins has problems such as environmental pollution, safety hazards, high machining costs and low production efficiency, especially due to insufficient rigidity and large machining errors caused by single-sided clamping.
A combined crank and neck roughing tooling is designed, which adopts a main and auxiliary chuck set opposite each other. The main and auxiliary chucks clamp the two wings of the crank forging, so as to complete the roughing of the neck in one clamping. The main and auxiliary chucks rotate synchronously to enhance the clamping rigidity and stability.
It improves processing efficiency and precision, reduces costs, and extends the service life of tooling.
Smart Images
Figure CN223932602U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a tooling fixture for machining the intermediate groove of an extra-large forging. It can clamp the forging circumferentially and ensure the stability of the rotational cutting process of the intermediate groove of the extra-large forging. It belongs to the field of mechanical design and manufacturing technology. Background Technology
[0002] The crankshaft of a large engine is composed of multiple cranks and journals. The crank blanks must undergo forging, machining, and heat treatment. Machining includes roughing and finishing. The journals are often rough-machined using carbon arc gouging. However, carbon arc gouging generates arc light, smoke, dust, and noise, polluting the environment. Furthermore, the molten metal slag poses a fire hazard or burns to operators, and the machining cost is high. If rough machining is done on a lathe, the existing lathes use single-sided clamping, resulting in a lack of workpiece rigidity during machining. This necessitates single-sided cutting and requires two clamping operations to complete the process, leading to low production efficiency and large machining errors. Therefore, a powerful tooling solution is needed to complete the rough machining of the cranks in a single clamping operation. Summary of the Invention
[0003] In response to the problems pointed out in the background art, this utility model proposes a combined crank forging roughing fixture, which sets up two main and auxiliary chucks with opposite clamping surfaces. The main and auxiliary chucks fix and position the two wings of the crank forging, so as to complete the roughing of the crank neck in one clamping.
[0004] To achieve the above objectives, this utility model adopts the following technical solution: a combined crank-neck roughing tooling, comprising: a crank forging and a lathe, wherein the crank forging is composed of a neck and two wings, and the lathe includes a lathe spindle chuck and a cutting mechanism, characterized in that:
[0005] The main spindle chuck is the main chuck, and the auxiliary chuck is arranged opposite to it, with the axes of the main chuck and the auxiliary chuck coinciding.
[0006] A clamping mechanism is provided on the opposing surfaces of the main chuck and the auxiliary chuck;
[0007] The clamping mechanisms on the main chuck and the auxiliary chuck clamp the two wings of the crank forging;
[0008] The secondary chuck rotates with the primary chuck.
[0009] Preferably, the main chuck, the auxiliary chuck, and the cutting mechanism are mounted on the same machine bed.
[0010] Furthermore, the clamping mechanism includes a movable clamping mechanism and a positioning stop.
[0011] Furthermore, balancing blocks are respectively provided on the opposing surfaces of the main chuck and the sub-chuck, and the positions of the balancing blocks are adjustable.
[0012] This invention features a secondary chuck opposite the main spindle chuck of a lathe. The secondary chuck rotates synchronously with the main chuck, and both wings of the crank forging are simultaneously clamped by the clamping mechanisms on both the main spindle chuck and the secondary chuck. This greatly enhances the clamping rigidity and stability of the crank forging, enabling the rough machining of the crank neck to be completed in a single clamping operation.
[0013] This utility model has the advantages of high efficiency, high processing accuracy, low cost and long tooling service life. Attached Figure Description
[0014] Appendix Figure 1 This is a schematic diagram of the clamping state of this utility model.
[0015] Appendix Figure 2 This is a schematic diagram of the clamping surface structure of the active chuck and the driven chuck.
[0016] Appendix Figure 3 For the appendix Figure 2 Schematic diagram of the rotating cross-section structure of AA.
[0017] In the attached diagram, 1 is the lathe headstock, 2 is the main chuck, 2' is the auxiliary chuck, 3 is the clamping mechanism, 4 is the auxiliary chuck seat, 5 is the crank forging, 6 is the cutting mechanism, 7 is the limit stop, and 8 is the counterweight. Detailed Implementation
[0018] As attached Figure 1 As shown, the main chuck 2 is mounted on the spindle of the lathe headstock 1, and the auxiliary chuck 2' is mounted opposite the main chuck 2. The auxiliary chuck 2' is mounted on the auxiliary chuck seat 4 via bearings, and the axis of the auxiliary chuck 2' coincides with that of the main chuck. The two wings of the crank forging 5 are clamped by the clamping mechanism 3 and the limit block 7 on the main chuck 2 and the auxiliary chuck 2', respectively. The counterweight 8 is mounted on the face plate of the main chuck 2 and the auxiliary chuck 2', and corresponds to and cooperates with the crank forging 5 to keep the main chuck 2, the auxiliary chuck 2' and the crank forging 5 in a balanced and stable manner when they rotate. When clamping crank forgings 5 of different specifications, the position of the counterweight 8 on the main chuck 2 and the auxiliary chuck 2' is adjusted to adapt to the rotational balance of crank forgings 5 of different specifications on the main chuck 2 and the auxiliary chuck 2'. The cutting mechanism 6 cuts the inner sides of the two wings of the crank forging 5. Since the two wings of the crank forging 5 are clamped, the inner sides of the two wings of the crank forging 5 can be cut in one clamping operation.
Claims
1. A combined crank-neck roughing machine tool, comprising: A crank forging and a lathe, wherein the crank forging is composed of a crank neck and two wings, and the lathe includes a lathe spindle chuck and a cutting mechanism, characterized in that: The main spindle chuck is the main chuck, and the auxiliary chuck is arranged opposite to it, with the axes of the main chuck and the auxiliary chuck coinciding. A clamping mechanism is provided on the opposing surfaces of the main chuck and the auxiliary chuck; The clamping mechanisms on the main chuck and the auxiliary chuck clamp the two wings of the crank forging; The secondary chuck rotates with the primary chuck.
2. The combined crank-neck roughing tooling according to claim 1, characterized in that: The main chuck, auxiliary chuck, and cutting mechanism are mounted on the same machine bed.
3. The combined crank-neck roughing tooling according to claim 1, characterized in that: The clamping mechanism includes a movable clamping mechanism and a positioning stop.
4. The combined crank-neck roughing tooling according to claim 1, characterized in that: The main chuck and the auxiliary chuck are respectively provided with balancing blocks on their opposite surfaces, and the positions of the balancing blocks are adjustable.