Reasonable selection of files has a great impact on improving file efficiency, ensuring file quality, and extending file life. Each file has its own purpose, and you must carefully choose the right file before filing. If it is not properly selected, it will not be able to give full play to its effectiveness or lose its cutting ability prematurely, and cannot guarantee the quality of the file.
The correct selection of the file should be considered according to the specific conditions of the processing object from the following aspects:
(1) The cross-sectional shape of the file should match the shape of the workpiece.
(2) Rough files are used for rough machining, and fine files are used for finishing. The coarse file is suitable for filing workpieces with large machining allowance, low machining accuracy and large surface roughness value; the fine file is suitable for filing workpieces with small machining allowance, high machining accuracy and small surface roughness value; single tooth file Suitable for processing soft materials.
The choice of file thickness depends on the nature of the workpiece material, the size of the machining allowance, the processing accuracy and the surface roughness requirements, the hardness of the workpiece material, etc. Rough file (or single-tooth file) is suitable for filing workpieces with large machining allowance, low machining accuracy and large surface roughness, and filing copper, aluminum, etc. due to the large tooth pitch and large chip space. Soft metal material; fine file is suitable for filing workpieces with small machining allowance, high machining accuracy and small surface roughness value, and filing steel, cast iron, etc .; polished files are used for final finishing and polishing the surface of the workpiece to improve Dimensional accuracy reduces roughness.
(3) The length of the file should generally be 150 to 200 mm longer than the filed surface. The size of the file size depends on the size of the workpiece processing surface and the size of the machining allowance. When the size of the processing surface is large and the machining allowance is also large, a longer file should be used; otherwise, a shorter file should be used. The length of the file should generally be 150 to 200 mm longer than the filed surface.
PPF (luminous flux density) is an indicator used to measure the light energy output of plant lamps, indicating the flow of light energy through a unit area in a unit time. The higher the PPF, the following effects on plant lights:
1. Provide more adequate light energy: high PPF means that plant lamps can output more light energy, which is very important for plant photosynthesis. Photosynthesis is a key process for plant nutrient synthesis and growth, and high PPF can provide more adequate light energy and promote the efficiency of plant photosynthesis, thus promoting plant growth and development.
2. Promote the photosynthesis efficiency of plants: plant lamps with high PPF can provide more intense light, so that the chlorophyll on the leaves of the plants can absorb light energy more fully, thus improving the efficiency of photosynthesis. The improvement of photosynthesis efficiency can increase the nutrient synthesis capacity of plants and promote the growth and development of plants.
3. Increase the yield and quality of plants: high-PPF plant lamps can provide more intense light and promote the growth rate and yield of plants. In agricultural production, the use of high-PPF plant lamps can increase the yield of crops, and the quality of crops may also be improved due to the increase in light intensity.
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