Method for overcoming keyway broaching defects

In the keyway broaching of thin-wall brittle material workpieces, the cracking of the keyway pull-out end often occurs, causing the workpiece to be scrapped, and the workpiece and the cracking position are as shown in Fig. 1. Observing the broaching process, it was found that the cracking always occurred when the keyway depth dimension was close to the requirement. The main reason is that the workpiece wall is too thin and the strength is low. Because the bottom surface of the keyway has a tendency to crack under the action of the pulling force, the groove depth is shallow in the initial stage of the broaching, and the strength of the workpiece can still be satisfied. As the groove depth increases, the bottom of the workpiece keyway becomes thinner and thinner, and the strength becomes weaker and weaker, eventually causing the bottom surface of the keyway to rupture. To this end, the spring collar can be added during broaching, as shown in Figure 2. Spring collar

Metallographic Cutting Piece

It is very important to control microbial activity in cutting fluid containers. Both bacteria and fungi can cause problems because they metabolize the components of the cutting fluid, resulting in the production of biofilm/mucus (large quantities of biofilm/mucus can exacerbate foaming problems and sticky surfaces) and secondary metabolites in the form of short-chain organic acids. The latter can result in a lower pH of the cutting fluid and an increased risk of corrosion. It is also important to note that high levels of bacteria and fungi can cause health problems for those operating the machines.



If the pH drops to less than 8.5, it may indicate bacterial growth in the cutting fluid. In such cases, we recommend measuring bacterial growth and replacing the cutting fluid if the test is positive.



Other signs of bacterial growth are a bad smell and fungal/bacterial film on top of the cutting fluid.

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