Center hole grinding machine

Parameters of central hole grinding machine

Working voltage: three-phase four wire 50Hz 380v
Total power: 1.8kw
Speed: adjustable from 100-1400r/min
Scratching time: 1-99h99min adjustable
Scratching pressure: 0.1-0.8MP adjustable
研磨*： 莫氏4#
*Journey: 30mm
Maximum diameter of workpiece: 160mm
Maximum length of workpiece: 320mm
Workpiece installation method: horizontal
Cooling method: Water cooling
Lighting: Explosion proof and Waterproof Fluorescent Lamp
Scratching method: Double headed
Number of workpieces installed at once: 2

Classification of center hole grinding machines

Center hole, also known as * hole, according to national standards
GB145-1985
The central hole can be divided
Type A central hole,
B-type central hole
C-type central hole

Working principle of center hole grinding machine:

The reference surfaces of the center hole are 60, 75, and 90 degree conical surfaces, which are also the working surfaces for machining shaft parts. Therefore, the working surface of the center hole is of good quality
Bad, directly affecting the outer circle quality of shaft components.
When machining the center hole, the process method is mainly formulated from two aspects: improving the quality of the conical surface and processing efficiency. Therefore
Based on the requirements of different precision levels of shaft parts and the production status of the enterprise, the process method for machining the center hole is determined as follows:

(1) When the standard tolerance level requirement for parts is IT10-IT12, the standard tolerance value is between 0.04-0.012mm. The process of the center hole is: outer circle of the car - end face of the car - drilling the center hole.

(2) The standard tolerance level requirement for the parts is IT8-IT9, with a standard tolerance value between 0.014-0.036mm. The process for the center hole is: outer circle of the car - end face of the car - drilling the center hole - end face of the car - drilling the center hole - heat treatment - grinding the center hole circular cone surface.
(3) The standard tolerance level requirements for the parts are IT6-IT7, with a standard tolerance value of 0.006-0.012. The process for the center hole is: rough machining - treatment - (quenching and tempering) - outer circle of the car - end face of the car - drilling the center hole - end face of the car - drilling the center hole - rough grinding of the center hole conical surface - heat treatment - grinding of the center hole conical surface.