(1) In order to ensure the processing accuracy, the roughing and finishing are preferably carried out separately. Because of the large amount of cutting during roughing, the cutting force and clamping force of the workpiece are large, the heat is generated, and the machining surface has a significant work hardening phenomenon. There is a large internal stress inside the workpiece. If rough and rough machining Continuously, the precision of the finished part will be quickly lost due to the redistribution of stress. For some parts with high machining accuracy requirements. After roughing and prior to finishing, a low temperature annealing or aging treatment should be arranged to eliminate internal stresses.
(2) Reasonable selection of equipment. Roughing is mainly to cut off most of the machining allowance, and does not require high machining accuracy. Therefore, roughing should be carried out on machine tools with high power and low precision. The finishing process requires higher precision. Machine tool processing. The roughing and finishing are processed on different machine tools, which can fully utilize the equipment capacity and extend the service life of the precision machine tool.
(3) In the machining process route, a heat treatment process is often arranged. The arrangement of the heat treatment process is as follows: in order to improve the cutting performance of the metal, such as annealing, normalizing, quenching and tempering, etc., it is generally arranged before the machining. In order to eliminate internal stress, such as aging treatment, quenching and tempering treatment, etc., it is generally arranged after roughing and before finishing. In order to improve the mechanical properties of the parts, such as carburizing, quenching, tempering, etc., it is generally arranged after the machining. If there is a large deformation after heat treatment, the final processing procedure must be arranged.
Road Salt is the Natural Sea Salt which made from sea water or deep underground brine. Road salt or De-Icing Salt is the most efficient way to control ice on the road. Safe road salt by effective up to -12 °C and is perfect for de-icing pavements, parking lots and roads. Our road salt can be ordered and delivered in individual packets or in bulk. In addition to road salt, we also supplies brine. With a concentration of 23% NaCl, the brine works quickly and efficiently up to -21 °C.
How road salt works:
Road salt works by lowering the freezing point of water via a process termed freezing point depression. In a nutshell, the salt breaks into its component ions in a small amount of liquid water. The added particles make it more difficult for the water to freeze into ice, lowering the freezing point of the water. So, for road salt to work, there needs to be a tiny bit of liquid water. This is part of the reason why road salt is not effective in extremely cold weather when water would freeze too easily. Usually, an extra source of water is not necessary because there is enough liquid water present, either coating the hygroscopic salt pieces or produced by friction from traffic.
When cold weather is forecast, it is common to pre-treat roads with brine, which is spreading road salt granular or a solution of salt and water.This helps prevent ice from forming and reduces the amount of road salt needed to de-ice the surface later. Once ice starts to form, road salt is applied in gravel or pea-sized chunks. Road salt may be mixed with dry or damp sand to aid the process, too.
Specifications:
Sodium Chloride: 96%-98%
Moisture: 0.5-2%
Particle size 0.5-5.6mm
Packaging: 1000kg/bag, 25kg/bag
Transportation method: bulk cargo ship, container
Road Salt
Road Salt,Snow Melt Salt,De-Icing Salt,De-Icing Agent Inorganic Salt
Weifang Xinchang Chemical Co.,Ltd , http://www.xinchangchem.com