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3. Body Material: Brass, Stainless Steel, Aluminum Alloy, UPVC, CPVC, PTFE, PA, PP, POM, etc
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7. Voltage: 12VDC, 24VDC, 24VAC, 110VAC, 220VAC, other voltages can be customzied
Analysis of interference of complex parts in CNC machine tools
**Introduction to Vectors**
To make the interference checking process more efficient, it is essential to define vectors at key points of the part. These vectors help in identifying the direction of the tool center path and comparing it with the programmed path. By analyzing the difference between the two directions, we can determine if any interference occurs. This method focuses specifically on interference issues during the machining of straight-line to straight-line or straight-line to arc shapes.
In this context, V1, V2, V3, and V4 represent the vectors of the tool center path at critical points where arcs A and B intersect. These vectors serve as important references for detecting potential collisions.
**Interference Detection Conditions**
Interference occurs when the direction of the tool path differs from the programmed path by 90° or more, or 270° or less. If the tool’s movement is opposite to the intended machining direction, it may cause a collision. This condition is crucial for ensuring safe and accurate machining operations.
**Preprocessing for Interference**
When performing tool radius compensation on blocks A, B, and C in the program, multiple vectors are generated. Between A and B, vectors V1, V2, V3, and V4 are created, while between B and C, vectors V5, V6, V7, and V8 are formed. These vectors are used to check for possible interferences along the path.
**Interference Checking and Resolution**
The system first checks for interference between the two most recent vectors. If interference is detected, it is resolved, and the next pair of vectors is checked. If any two vectors interfere, the CNC automatically cancels the interference and moves the tool in a straight line. For example:
- Between V4 and V5 – interference detected – resolved
- Between V3 and V6 – interference detected – resolved
- Between V2 and V7 – no interference
- Between V1 and V8 – interference detected – resolved
After all interferences are removed, the tool moves linearly from V1 to V8. In cases where only one vector interferes, the CNC automatically adjusts, and the tool makes a linear move within that segment.
**False Interference**
Sometimes, the tool may stop even when there is no actual interference. This happens due to the direction of the single block being opposite to the tool's corrected path. Two common scenarios include:
1. A recess smaller than the tool radius correction, causing the tool to stop despite no real collision.
2. A groove smaller than the tool radius, leading to a false warning due to directional mismatch.
These situations highlight the importance of careful programming and tool path planning.
**Japanese Mold Industry Trends**
According to recent reports, the output value of Japan’s mold industry has been declining year after year. Experts suggest that the industry has reached a point where significant transformation is difficult. Compared to other manufacturing sectors, the mold industry bears a heavier cost burden, especially regarding equipment depreciation. This affects profitability, especially as major clients—ranging from automotive to semiconductor industries—gradually shift production overseas. As a result, Japan’s mold industry has increasingly focused on international markets.
Japan currently holds about 40% of the world’s mold production capacity, ranking first globally. However, since its peak output of 1.87 trillion yen in 1998, the sector has been in decline. The rise of mold production in other Asian countries has made them highly competitive in both cost and technology, which has led to a 20% drop in Japanese mold prices in recent years.
**Current Challenges and Future Outlook**
Today, the Japanese mold industry faces challenges such as unstable orders, price competition, shorter delivery times, and stricter quality standards. To remain competitive, the industry must focus not only on high-precision machining but also on creating high-value-added products that stand out from standard molds. This strategy is also relevant for other Asian regions aiming to enhance their own mold-making capabilities.
**Wen’an County Nordson Mould Factory**: http://