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The history of metal cutting in China is not long, but when people apply the applied laws to production practice, they will find their powerful role, as the International Production Technology Research Association (CIRP) pointed out in a research report: The improvement of the tool material, the cutting speed allowed by the tool, almost doubled every 10 years: due to the improvement of the tool structure and geometric parameters, the tool durability is almost doubled every 10 years." The current world is in the technology The rapid development of information, new materials are commonly used in the era of production, how to use the basic theory of metal cutting, to observe, analyze and solve the practical problems in metal cutting, according to specific conditions, select tool materials, tool geometry and cutting . And according to the process requirements, the tool and design tool are reasonably selected to improve the efficiency of metal cutting.
There are many ways to machine threads, and turning threads is one of the most common methods. Improving the thread turning efficiency, shortening the tool change and adjusting the tool and other auxiliary time is the goal that people are eager to achieve. The following are two kinds of thread processing tools that have been matured in production practice, and communicated and discussed with peers.
1 ball high speed wire knife
Tool features: (1) The blade material is YT15 hard alloy, the cutter body is 45 steel; (2) the nose angle is 59°30', the left blade back angle is 5°30', and the right blade back angle is 2°~3 (3) Grinding 0.1 to 0.2 mm for the enhanced blade curvature, 1° to 3° negative chamfering; (4) for the chip to be spherical, for safety, the rake angle is 3°, and the rake face is inclined to 0° 30'.
Working parameters: processing range M20 ~ M24, V = 30 ~ 34m / min.
Use effect: a knife forming, chip removal smooth, chip into a spherical shape, thread surface roughness Ra3.2μm, safe and easy to use.
Note: When loading the knife, the tool tip is 0.5mm higher than the working center.
2 knife forming machine clamp thread pick knife
Tool features: (1) The tool body is 45 steel, the quenching hardness is HRC45-50, the blade is YT15; (2) The blade is milling with 4° front angle. Do not grind the chip breaker, rely on the hard alloy chip breaking on the pressure block; (3) the blade does not weld, maintain the original performance, long service life, reduce loss; (4) adopts the horizontal pull-up method, the clamping is firm, It is easy to manufacture, with a pressure of 110° at the front of the tool and a 4° angle of the cutting edge of the tool. The iron scraps are discharged in a spherical shape for safe operation.
Working parameters: speed n=613r/min pitch r=1.5mm, one knife forming.
Use effect: 2-3 times better than general tool, surface roughness up to Ra1.6μm, above.
Note: The outer diameter of the machining work should be 0.4 to 0.5 mm smaller than the nominal size. Otherwise, the outer diameter is too large and cannot be matched with the nut.
3 Conclusion
Promote and use new tool materials, machine clamps (without re-grinding) turning tools, rationally change the tool geometry angle, and select the appropriate cutting amount in production practice, which can significantly improve tool durability and improve the processing quality of parts surface. Auxiliary time such as sharpening, tool change, installation, adjustment, etc., greatly improve labor productivity and reduce production costs.
Concerned about surprises
Tag: Tool durability Chips Tool material Threading Chip removal
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