CuCr alloy material machinery manufacturing process and application(2)

CuCr alloy material machinery manufacturing process and application(2)

2022-05-24 13:35:37 8

3. Solution

According to the above phenomenon and cause analysis, first of all, in Cu, Cr raw material procurement, manufacturers of Cu, Cr material purity and particle size of strict testing, this paper here for the copper-chromium contacts manufacturing and processing process to improve.


(1) for the shape of the CuCr contact with groove type process improvement. In the tool selection unified choice of carbide inserts, choose the processing object for turning Cu, Al, Ti alloy type inserts, instead of the previous selection using processing non-ferrous metal type inserts, after several tests, the previous choice of inserts comprehensive processing effect is not good, inserts wear-resistant but only processing a small number of contacts (30 pieces) on the blade does not appear sharp phenomenon, now using KOLOY inserts, as shown in Figure 4, model Such as CCGX09T304-AK, etc., using cutting fluid for turning processing, turning process must pay attention to operational details: the operator loading, taking parts uniformly with gloves operation, when each contact finishing process is completed, put into plasma water soak about 15 ~ 20min, and then remove the contact surface blow off the water, dry placed in a clean plastic frame, and then flow into the next milling process.


Note that carbide saw blade milling cutter slotting and end mill chamfering are used here. As CuCr25φ42×6 components processing, design tooling as shown in Figure 5, through program optimization and tooling improvement, 7 pieces are processed at the same time at one time (the actual number of processed contacts is determined according to the effective length of the core rod 45mm), and the average processing of 420 pieces in one shift is 2.8 times higher compared with the previous one (150 pieces per shift in the previous hand-operated machine tool), and the current process route: batching → pressing and forming → re-pressing → Vacuum sintering → fine turning (outer diameter, end face processing amount of 1mm, 0.5mm) → slotting → clamping → testing → packaging (plastic bag vacuum packaging) → shipping; in the process clamping to complete the deburring, polishing, cleaning, drying and other work steps, so as to effectively ensure that the contact surface clean, no handprint, roughness and other technical requirements.


(2) For the shape of non-slotted contacts, the process route is developed. Process route: forming (arc melting) → rough turning → sawing → heat treatment → rough turning (outer diameter and end face leave 1mm and 0.5mm respectively) → fine turning → inspection → packaging (plastic bag vacuum packing) → shipping.


Here it is worth noting that the contact blanks are formed by arc melting method, the blank is bar, so it needs rough turning, then sawing, rough turning, where the first rough turning process rough turning outer circle, easy to sawing, after the rough turning process outside the circle as a benchmark for clamping, positioning, after the rough turning role to facilitate accurate positioning of precision turning, to ensure that the outer circle, end face evenly left amount, such as contact precision turning outer circle machining allowance of 1mm, end face 0.5mm (upper and lower end face (both upper and lower end 0.25mm), finishing CuCr contacts have a very important skills, workpiece clamping depth of finishing usually 0.5 ~ 1.2mm, to ensure that the second process in the finishing can be complete processing component contours, small machining allowance to ensure that in the finishing CuCr contacts outer circle, arc, end face when the workpiece is not flown out, this is very important!


At the same time, in the processing of the outer circle, end face permitted conditions, change to a larger tip angle R0.8mm (the original tip angle R0.4mm), as far as possible once complete processing of the contour, or through the program correction to avoid the appearance of the joint tool marks. The use of dry cutting must require the operator to wear a mask, rubber gloves, finishing the workpiece, should be used to pick up the workpiece tweezers, put into a clean plastic basin, pay attention to lightly hold and lightly put in time to test the packaging, so as to effectively ensure that the surface of the workpiece clean, no scratches, no handprints, no oxidation product quality requirements, and, in the process of finishing contacts or storage contacts warehouse premises should be strictly controlled room temperature, to avoid oxidation generated Yellow spots appear.


4. Conclusion

There are many methods of forming CuCr alloy contacts, and each company should develop a suitable process according to existing equipment and customer needs. By following up the problems on site, analyzing and prescribing the right remedy, the problem was solved. Currently CuCr25, CuCr30 and CuCr40 contacts have also been developed and applied. Here, we also hope that manufacturing Cr manufacturers and production contact companies will work together to make better contacts to meet customers' needs through process improvement.


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