If you pay attention, you will find that in many barrel-making enterprises processing steel drum bottom, top blank forming, will be coated with a layer of lubricant on the surface of the thin steel sheet, especially for hot-rolled steel sheet, if not coated In lubricants, most of the workpieces after stamping are cracked or cracked. So, why is there no cracking when it is coated with lubricant? This is because when the hot-rolled steel sheet, because the sheet cooling faster, so the temperature at the end of the rolling is relatively low, in general, the temperature is about 600 ~ 650 °C, then the plasticity of the metal has been reduced (this is The reason why the hot-rolled steel sheet does not have the good drawing property is that the hot-rolled steel sheet has a poor drawability, and the rigidity and brittleness increase. In addition, residual stress occurs inside the steel sheet, causing it to deform. The interaction of different extensions will cause the more extended portion to be inhibited by the smaller portion of the adjacent extension to produce compressive stress, while the less extended portion will have the tensile stress. The presence of these residual stresses will cause deformation of the surface of the hot rolled steel sheet, affecting the smoothness of the surface. Therefore, we often find that the surface of the hot-rolled steel sheet has warping inequality. The blank forming (drawing) process at the bottom and top of the drum barrel is actually a plastic deformation process of the metal sheet steel. There is friction between surfaces that move with each other. As a result of the friction, the molds that cause the blanks to draw are worn; scratches and scratches also appear on the bottom and top surface of the bucket. This not only shortens the service life of the drum bottom and the top blanking forming die, but also affects the surface quality of the bottom and top of the drum. In addition, due to the presence of friction, the deformation force and deformation work at the bottom and top of the bucket at the time of blanking and drawing are increased, and the resistance of the sheet material to be pulled into the die hole is increased. Therefore, the sheet material drawn into the die hole is more ideal than the ideal state. Less, so that the bottom of the bucket, the top of the drawing die at the top of the corner due to deep drawing materials can not be added in time to appear thin, puncture, etc.; the bottom of the barrel, the top in the blanking depth of the deformation force and deformation work The increase will also cause the internal metal deformation of the material to be non-uniform, so that the movement direction of the metal internal slip line will change, producing tensile stress and compressive stress. Reflected in the bottom of the barrel, the pull-out phenomenon occurs during the top blanking process. In order to reduce the adverse effects caused by friction, to prevent premature wear of the mold surface and the presence of defects such as cracking of the bottom of the bucket, top cover, and surface bite, a lubricant must be added between the metal sheet and the mold surface. First, the bottom of the barrel, top deep drawing of the lubricant requirements 1. The lubricant should have good pressure resistance performance. Under the effect of high pressure, the lubricating film can still adsorb on the contact surface and maintain the lubricating effect. That is, it can form a high-strength film, withstand a lot of pressure, and have good adhesion. 2. The lubricant should not corrode the bottom, top and mold of the bucket. 3, lubricants to deal with the human body is non-toxic, does not pollute the environment, and chemical properties are stable. 4, lubricants require the use, easy to clean, rich sources, cheap and so on. Second, the bottom of the barrel, the top of the commonly used lubricant At the bottom of the barrel, the top blanking material often contains fat and fatty oils (fat or fatty oils, including animal and plant-like butter, lard, fish oil, cottonseed oil, castor oil, etc.). Or soap-based emulsions of fatty oils, mineral oils, with fine powder fillers such as chalk powder or lithopone; or vulcanized oils; or fillers and vulcanized oils. Cold extrusion lubrication can also be used, that is, phosphating and saponification. The above-mentioned lubrication method is used to lubricate the bottom of the bucket and the dripping oil on the top is dripped along the way, which increases energy consumption and pollutes the operating environment. What is more serious is that the lubricant adhered to the workpiece must be cleaned before subsequent processing. This not only extends the working hours but also increases the cost. At present, a microemulsified water-soluble lubricant has been developed, which not only can remove the cleaning process before the subsequent processing, but also has a relatively inexpensive price. Therefore, the use of aqueous lubricants can reduce processes and reduce costs. How is this lubricant made? The composition of the water-soluble barrel bottom and top stamping processing lubricant adopts the method of micro-emulsion. First, the oil-soluble additive solution is formed into an oil phase in the oil, and then the water-soluble additive is dissolved in water to form an aqueous phase, and then the two Mixing and mixing under the action of a surfactant can form a microemulsion, and the emulsion can have a variety of properties by virtue of the effects of the oil solution and the aqueous solution additive, thereby satisfying the bottom and top stamping process. Claim. 1, the basic composition The bottom barrel and top stamping process use full loss lubrication, the lubrication fluid is not recycled, the temperature at the time of liquid supply is low, it is room temperature, so non-ionic surfactant can be selected; the thin oil film adhered by the steel plate is used for lubrication during stamping Therefore, the composition of the microemulsion should be selected from mineral oils with higher viscosity, and water-soluble tackifiers should also be added in the aqueous phase to ensure the thickness of the adhesion layer of the lubricant. 2, the preparation of lubricants The lubricity at the bottom of the barrel and the top stamping process includes adhesion and film formation to achieve the two parts of extreme pressure and anti-wear property of chemical reaction under low load oiliness and high load. The non-ionic surfactant contained in the microemulsion reduces the surface tension of the water and effectively achieves the diffusion and adhesion of the processing liquid on the surface; the adsorption film formed by the polar molecules such as fatty amines shows good results. Oily effect. 3, the use of effects The bottoms and tops of the barrels processed using the microemulsified water-soluble stamping lubricants are bright on the surface of the processed parts, without drawing marks and black deposits. After the stamping process, the barrel bottom and the top cover do not need to be subjected to the degreasing and cleaning process, so that the effect of degreasing with other lubricants can be achieved. In addition, the use of microemulsifying water-soluble lubricants does not cause dissolution of the paint on the punch, and it does not irritate the odor and does not corrode the operator's skin; it does not substantially pollute the air and the environment in which we live. So it has good lubricating properties, anti-rust properties, anti-corrosion properties and adhesion capabilities. It is the ideal lubricant for processing the bottom of the barrel and stretching the top blank. Pdc Cutter For Mining,Pdc Cutter,Gas Pdc Cutter,Water Well Pdc Cutter HENAN YALONG DIAMOND TOOLS CO.,LTD , https://www.pdcpcbncutter.com
Talk about the lubricant in the bottom stamping process of drum barrels