Rapid production of products is the common goal of manufacturing colleagues. The value of cemented carbide saw blade is low, so the production efficiency is particularly important for saw blade producers. Grinding process occupies about half of the time in the production process of saw blade, so how to improve the production efficiency in the grinding process of saw blade is a matter of concern to the saw blade producers.
Grinding process is divided into two processes, 1. Grinding process of grinding wheel and workpiece contact; 2. Auxiliary time; the efficiency of grinding process of grinding wheel and workpiece contact can be improved by speeding up the tool walking speed, but at the same time, it brings the disadvantages of speeding up the loss of grinding wheel, increasing the risk of rapid change of workpiece size and increasing the number of wheel replacement. Shorten the unnecessary auxiliary time, improve the efficiency of more space.
We explain how to improve the efficiency of saw blade grinding by grinding the back angle of the saw blade. The grinding of the back angle of the saw blade is divided into the following four steps:
In the process of knife setting: the fast walking knife turns to the slow walking knife, where a = 2 mm or so;
Easy to make mistakes: A is too long, especially in the process of thin tooth grinding, which seriously affects the grinding efficiency; a is too short, which causes the grinding wheel to touch the workpiece before reaching the set speed, or even the workpiece when fast cutting, which leads to serious wear of the grinding wheel.
The main problems in grinding process are as follows: too slow cutting speed affects grinding efficiency; too fast cutting speed leads to 1. Tool paste; 2. Fast grinding wheel loss; 3. Reduced saw blade accuracy; 4. Edge collapse (not sharp).
The determination of cutting speed: cutting speed (mm / s) x cutting head width (mm) ≈ 10 ~ 15. For example: 305x96tx3.2 tool speed = 10 / 3.2 = 3 ~ 3.5mm/s.
The length of the whole tool travel ≈ a + cutter head thickness + B + grinding wheel width = 2 + 3 + 2 + 5 = 12mm
The action of grinding each tooth = gear shifting + fast cutter + slow cutter + grinding + tool retraction + return; time = 1.0 + 0.5 + 0.5 + 3.5 + 0.5 + 1 = 7 seconds / tooth
Take 305x96t as an example: the overall grinding time is about 7x96s = 672s = 11.2min
The way to increase the speed is as follows:
1. Minimize the length of a and B.
2. Improve the feed speed in the four processes of gear shifting, fast feed, retraction and return
The above is the example of rear corner grinding, and how to improve the grinding efficiency is analyzed. By analogy, the efficiency of the whole grinding process can be improved through the above methods for both sides and front corners.
Editor: Dong yinglei, Shijiazhuang jinhengtai Grinding Wheel Co., Ltd
2021.3.27
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