Introduction of Vectors To facilitate the discussion of interference checking, first make a vector at the key points of the part, then make a tool center path and mark the direction. The path of the center of the tool can be compared with the direction of the program path to determine whether or not to interfere with the difference between the two. Here, only the interference problem of the shape processing of the straight line-straight line, straight line-arc shape is discussed. Among them, V1, V2, V3, and V4 are the vectors of the center path of the tool at the key points of the arc intersections of A and B.
Condition of Interference Judgment Condition: The path direction of the tool is different from the path of the program (90° or more, 270° or less). When the tool is machining the shape of the part, its path is opposite to the machining direction, causing interference.
Pre-processing of interference When the tool radius correction is performed on the block A, B, and C of the program, multiple vectors (V1, V2, V3, and V4) are generated between A and B, and multiple vectors are generated between B and C (V5). , V6, V7, V8).
First, check for interference from the two most recent vectors. If interference, perform interference processing, and then interfere with the nearest two vectors. If the two or two vectors examined interfere with each other during the inspection, the CNC automatically cancels the interference and the tool moves linearly. Interference checking and interference processing are as follows: between V4 and V5 - interference - eliminating between V3 and V6 - interference - eliminating between V2 and V7 - interference - eliminating between V1 and V8 - interference - erasing after removing all interference, the tool is removed from V1 -V8 makes a linear movement. If only one of the single-segment vectors interferes during the inspection, the CNC automatically cancels the interference, and a linear movement occurs in the single-section tool. Interference checking and interference processing are as follows: between V4 and V5 - interference - eliminating between V3 and V6 - interference - eliminating between V2 and V7 - not interfering between V1 and V8 - interference - erasing, after all interference is eliminated, the movement of the tool is: V1 - V2 - V7 - V8.
False interference In the program, some actually do not interfere, but because the direction of the single block B program is opposite to the direction of the tool diameter correction, the tool will also stop.
(1) The recess is smaller than the tool diameter correction amount. There is actually no interference, but because the direction of the single block in the single block B program is opposite to the path corrected by the tool radius, the tool stops here and displays a warning.
(2) A groove smaller than the tool radius correction amount. In the direction of the single block B program opposite to the direction of the tool path correction, the tool stops and a warning is displayed.
According to reports, in recent years, the output value of the Japanese mold industry has been decreasing year by year. Experts believe that the Japanese mold industry has reached a point where it cannot be reformed. Compared with other manufacturing industries, the Japanese mold industry has a heavier cost burden on mold processing equipment, and the cost burden of mold processing equipment is heavier. Therefore, the depreciation rate of equipment is high and low, which directly affects the income, plus major customers, from automobiles to semiconductors. Gradually moving outward, in order to improve operational efficiency, the country's mold industry has also had to shift its focus to overseas.
Japan's mold production capacity accounts for about 40% of the world's total, ranking first in the world, but after the peak of the output value of 1.87 trillion yen in 1998, it is in a recession. In addition, based on the large-scale development of molds in other Asian countries and regions, regardless of cost or technology in this region is quite competitive, affected by the establishment of a versatile mold production system, Japan's mold prices have also dropped by about 20% in recent years.
At present, the operating difficulties of the Japanese mold industry are generally summarized as unstable orders, price reductions for orders, inability to cope with the shortened delivery period, high-tech technology, and increasingly stringent quality requirements. In view of this development background, in addition to working hard on high-precision machining technology, how to distinguish it from general molds and create high value-added processed products is the direction of the Japanese mold industry, which is also the need of other Asian countries and regions. New topic.
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