Improved Headstock of Universal Tool Grinder M9120A
Introduction
Universal tool grinder M9120A is a tool grinding solution for simple to complex tool geometry change and grinding. It is mainly used for grinding, side piercing, end miling, chamfering, drilling, milling and other machining operations. It has high rigidity and high accuracy. Its headstock, as the important part, is enhanced so as to have better grinding effect and safer operation process.
Design Principle
The design principle of the improved headstock of M9120A is to make it convenient and safe by enhancing its precision, stability and robustness. It must comply with the machining accuracy and requirements, ensure the cutting method and grinding operation quickly and safely. According to the principle of tool grinding, the grinding angle and headstock angle of grinding cutting edge should be uniform, consistent and reasonable.
Metallurgical Research
The cutting edge is the contact part between tool and workpiece in the grinding process. In order to ensure the yield of cutting edge in the grinding process and improve the contact stiffness, the hardness at cutting edge should be improved. The hardness at cutting edge is mainly related to the metal material and heat treatment process. The researchers select HCR13 and HCR18 metal materials for machining the parts, and use cryogenic quenching process. Compared with the traditional heat treatment process, the cryogenic quenching process has better mechanical properties and corrosion resistance, and can meet the requirements for the improvement of cutting performance.
Mechanical Structure Design
The mechanical structure design of the headstock mainly includes its structural design, strength analysis and motion accuracy analysis. Firstly, the transition curve is reasonable and its shape is stable, the contact surface is reasonably optimized, the contact area is increased, making reasonable design according to the strength analysis of the material. Secondly, the transmission parts are selected, reasonable processing allowance is set, reasonable force bearing and assembly clearance and tolerance is ensured, and the motion accuracy analysis is carried out. Finally, assembling and fixing should be reliable, and motion precision and displacement regulation should be applicable.
Assembly and Adjustment
The assembly and adjustment of the headstock has very important influence on the grinding accuracy and quality of workpieces. There are several important steps in the assembly process, such as grinding wheel installation and adjustment, spindle seat positioning and grub screw locking, etc. The spindle nut is the essential parts for tool adjust, the matching clearance of the nut and the manual of adjustable should be kept and adjusted in 0.03mm. The nut should be adjusted with appropriate force, and should not be locked too tight or too loose in order to prevent it from affecting the accuracy.
Conclusion
The improved headstock of universal tool grinder M9120A is designed and manufactured from the aspects of metallurgical research, mechanical structure design, assembly and adjustment, etc. It can ensure the cutting performance and grinding accuracy, ensure the safe operation and contented the precision machining requirements of tool grinding process. It can improve the tool grinding accuracy and grinding quality, and make the operation process of the headstock more reliable, safer and user-friendly.
