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ASIMCO Camshaft (Yizheng) Co., Ltd.
Technical Improvements in the Grinding Quality of CNC Grinding Machines
Release Date:
18-04-23
The grinding process is an important downstream process in the production of Camshaft blanks, which not only removes residual material from the gating system but also ensures that over-grinding does not occur, resulting in insufficient machining allowance and scrap.
For a long time, the grinding process in the casting workshop has relied on a combination of CNC grinding machines and manual finishing. This approach demands consistent grinding performance from the CNC machines; if residual material remaining after machining exceeds acceptable limits, extensive manual rework is required, which is both time-consuming and labor-intensive. Conversely, if the CNC machine over-grinds, it can easily result in scrap of the raw castings. This issue has long been a persistent challenge, necessitating continuous adjustments to the machining program’s toolpaths to ensure grinding quality.
This month, we decided to implement technical improvements to the CNC grinding machine’s program to resolve previous issues.
Improvement process:
Step 1: Following an inspection of all grinding machines, it was found that the CNC programs for five of them exhibited varying degrees of discrepancy, with no clear definitions for the start and end positions. Operators could alter the end position of the grinding wheel by modifying program statements, resulting in inconsistent surface finish quality among different operators. Therefore, the first priority is to rewrite the programs to explicitly specify the start and end positions of the grinding wheel and standardize these settings across all machines.
Step 2: During the debugging of the program, it was found that the grippers on the fixture were prone to wear, resulting in poor clamping of the workpiece and frequent positional deviation. Therefore, a new fixture was redesigned and manufactured, abandoning the previous gripper configuration in favor of a bowl-shaped, semi-enclosing structure. The tailstock cylinder applies pressure to firmly hold the workpiece in place, while the surrounding semi-enclosure serves to constrain its position.
Step 3: Through continuous debugging, identify defects in the machine tool and carry out repairs.
Step 4: Implement lifecycle management for grinding wheels by replacing them on a scheduled basis, thereby maintaining their cutting performance and preventing excessive grinding residues.
Through the above four steps, consistent grinding quality has been achieved on the grinding machine, thereby reducing the workload of operators, preventing scrap of raw blanks, and increasing the yield of qualified parts.
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ASIMCO Camshaft (Yizheng) Co., Ltd.
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