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淬硬类工件硬车和磨削的复合加工

The turning and grinding center is a precision machine tool that combines hard turning and grinding to comprehensively process hardened shaft workpieces. Although tool technology has made great progress and hard turning has made great progress in replacing grinding, according to the current technical level of cutting tools and machine tools, the highest machining accuracy that hard turning can achieve is IT5.

The reason is that due to the limitations of the minimum tool nose radius and its strength, hard turning cannot yet cut μm-sized chips. Therefore, hard turning cannot completely replace grinding, so when machining with a precision higher than IT5, grinding is still required. Hard turning and grinding can be used to process parts with different precision requirements respectively, and the main advantage of the combination of these two processing techniques is that pre-hard turning can reduce the grinding allowance, thereby significantly reducing the basic grinding time. .

Here, from the example of processing a hollow taper shank (HSK), we can see the technical and economic effects of the combination of hard turning and grinding. The hollow taper shank is a high-precision complex part, and the accuracy requirements for its positioning cone surfaces d2 and d3 are equivalent to IT2. On the turning and grinding center, the clamping bevel on the inner contour of the workpiece and the clamping groove for tool change can be processed by hard turning, while the positioning cone and support cone on the outer contour that require strict tolerances are pre-hardened first. Turning, leaving a certain grinding allowance, and then finishing by grinding using measurement control. Due to the use of pre-hard turning, the grinding time is reduced and the dressing time of the grinding wheel is also reduced.

Due to the small grinding allowance, the grinding wheel does not need to be dressed every time a workpiece is ground. And because the above process is completed in one clamping of the HSK tool holder, the mutual position accuracy between these functional surfaces is guaranteed. For HSK A 63 specification tool holders, it only takes (95-120) seconds to complete the above process, which significantly shortens the processing time. On the turning and grinding center, the back spindle can also be used to clamp the HSK tool holder for a second time to achieve U-turn processing of the workpiece.

Turning and grinding centers are usually designed based on the modular principle and can be selected and assembled according to the user’s specific processing tasks. For example, Index’s turning and grinding center can be equipped with internal or external grinding spindle heads, corundum grinding wheel dressing systems, electromechanical automatic dynamic balancing devices, measuring devices and solid-state sound monitoring devices to identify grinding wheel grinding cuts according to user requirements. In addition to the various types of turning, milling and turning and grinding centers mentioned above, the compounding of machine tools is also developing into machining centers and special-purpose machine tools.

Turning and grinding centers are usually designed based on the modular principle and can be selected and assembled according to the user’s specific processing tasks. For example, Index’s turning and grinding center can be equipped with internal or external grinding spindle heads, corundum grinding wheel dressing systems, electromechanical automatic dynamic balancing devices, measuring devices and solid-state sound monitoring devices to identify grinding wheel grinding cuts according to user requirements.

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