How to use carbide taps reasonably

MRCM share / 2022-02-08 / Hits(5904)

How to use carbide taps reasonably?
Cemented carbide is an alloy material made of hard compound of refractory metal and bonding metal through powder metallurgy process.
Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which remain basically unchanged even at a temperature of 500 °C , still has high hardness at 1000℃.

Carbide is widely used as tool material, such as turning tools, milling cutters, planers, drills, boring tools, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone and ordinary steel, and can also be used for cutting Difficult-to-machine materials such as heat-resistant steel, stainless steel, high manganese steel, tool steel, etc.

The basic requirements for the machine tool: the spindle runout of the machine tool is less than 0.005mm, and the work is stable.

Requirements for the accuracy of tool installation: After the tap is installed on the tool system, the runout of the machine tool spindle is less than 0.02mm.

Thread bottom hole requirements before tapping: the position of the thread bottom hole to be tapped is less than 0.04MM, and the chamfer of the hole is (0.3 ~ 2) × 45 degrees, which is approximately proportional to the nominal diameter of the thread.

Tap geometry selection
When the hole to be machined is a through hole, left helical groove or straight groove tap can be selected;
When the hole to be machined is a blind hole, the right helical groove should be selected.
When customizing blind hole taps, the length of the incomplete thread should be provided, and the distance between the front end face of the threaded bottom hole and the front end face of the incomplete thread should be as large as possible.

Tool system requirements
A rigid tool system should be used and floating connections should be avoided to prevent tap breakage.

Choice of cutting fluid
Oil-based cutting fluid is recommended for cutting fluid. Water-soluble cutting fluid (emulsion) can also be used if conditions are not available.

Selection of cutting speed
A. No internal cooling, no coating tap
For tapping grey cast iron screw holes, the recommended cutting speed of the tap is v=(20~25)m/min
For tapping aluminum alloy screw holes, the recommended cutting speed of the tap is v=(24~30)m/min

B. Internal cooling, uncoated taps
For tapping grey cast iron screw holes, the recommended cutting speed of the tap is v=(23~29)m/min
For tapping aluminum alloy screw holes, the recommended cutting speed of the tap is v=(28~35)m/min

C. Internal cooling, coated taps
For tapping grey cast iron screw holes, the recommended cutting speed of the tap is v=(30~38)m/min
For tapping aluminum alloy screw holes, the recommended cutting speed of the tap is v=(36~45)m/min

       Zhejiang Meiri Intelligent Equipment Co., Ltd. is a service provider specializing in the development and production of small special tool grinders and precision machines. The company's main products: CNC tool grinder, drill grinder, milling cutter grinder, thread tapping grinder, turning tool grinder, saw blade grinder, universal knife grinder, universal tool grinder, chamfering machine, pneumatic tapping machine , Electric tapping machine, zero point positioning system, precision vise, rotary table, EDM machine and other precision machinery series. Products from research and development, manufacturing, management to sales strictly implement the ISO9001 quality management system, continue to innovate, continuously improve the enterprise management system, improve efficiency, and provide professional, reliable and high-quality products to serve global customers.