Introduction of powder metallurgy tap coating

Release time:

2022-12-27

Introduction of powder metallurgy tap coating The coating steam oxidation of the powder metallurgy tap: After the powder metallurgy tap enters the high temperature water vapor, a layer of oxide film is formed on the surface, which is well adsorbed on the coolant, which can reduce friction and prevent the bonding between the tap and the cutting material. Suitable for processing low carbon steel.

　　powder metallurgy tapCoating Introduction

The surface of the powder metallurgy tap is covered with steam oxidation: After the powder metallurgy tap enters a high-temperature water vapor, there is no student oxide film on the surface, which is well adsorbed on the coolant, which can effectively reduce trade friction and prevent the development of taps and cutting technology materials The bond between them is suitable for deep operation of low carbon steel. Nitriding time treatment: nitriding the surface of the tap to form a surface hardening layer, which is suitable for tool wear during the deep operation of cast iron, cast aluminum and other materials. Steam + nitriding: combined analysis of the above is the advantages of both. The surface covering is golden yellow, with good firmness and lubricity, and good adhesion. It is suitable for most building materials in our country's deep operation enterprises. The blue-gray surface is covered, the firmness is about 3000HV, and the heat resistance is 400°C. The dark yellow surface coverage aspect has very excellent surface coverage robustness and lubricity, which is suitable for producing most learning materials with deep operation methods. Blue-gray surface covering, sturdiness 3300HV, heat resistance up to 900°C, can be used for economical high-speed information depth operation. The silver gray surface is covered, and the lubrication system performance is more superior, mainly including the deep operation of non-ferrous metal products in China. The surface coverage of powder metallurgy taps has a significant impact on the performance of the tap, but at present, various equipment manufacturers and surface cover manufacturers are able to communicate and cooperate with each other to provide special surface coverage. Cooling working conditions: For these powder metallurgy taps, especially extruded powder metallurgy taps, the requirements for coolant are lubrication and GT; cooling; in actual use, we can prepare according to the conditions of the machine tool (when using traditional emulsions, The recommended mass concentration is significantly greater than 10%).

Accordingpowder metallurgy tapThe type, material, depth operation material and robustness, as well as the advantages and disadvantages of tap equipment, gives the depth operation parameters of powder metallurgy tap. Generally, according to the parameter selection given by the powder metallurgy tap manufacturer, deceleration is required in the following situations: poor machine rigidity; large tap jump; insufficient cooling; uneven material or firmness of the welding area, Uch as a welding joint; tap extension rod Or use an extension rod. Manual operation, such as bench drill, boom drill, etc.

Select some powder metallurgy tap technology, powder metallurgy tolerances of different accuracy levels, and selection criteria, and select and determine the material and robustness of the deep operation workpiece according to the accuracy of the deep operation thread, tapping equipment (such as machine conditions, Clamping handle, cooling environment, etc.), precision and manufacturing error of powder metallurgy taps. For example, when operating 6H thread in depth, 6h detail tap can be used for steel depth operation, and 6HX detail tap should be used for gray cast iron depth operation, because tap diameter wear is fast, screw hole expansion is small, and service life is longer.

The cutting tap OSG uses an OH detail system different from the ISO standard. The OH detail system will force the tolerance band width to exceed the lower limit. Each 0.02MM is a precision grade, named OH1, OH2, OH3, etc. The extrusion tap OSG uses the RH detail system to force the entire tolerance band width to exceed the lower limit. Each 0.0127MM is a precision grade, named RH1, RH2, RH3, etc. Therefore, when using ISO fineness taps instead of OH fineness taps, 6H should not be considered to be approximately equal to OH3 or OH4.