Stainless steel rack knowledge:stainless steel rack maintenance stainless steel rack application has been very wide,stainless steel rack is not easy to rust does not mean it will not get dirty and wear,so in the daily use of stainless steel rack we have to pay attention to maintenance and maintenance.Today small make up for you to introduce stainless steel rack maintenance:a,the first to start from the Angle of installation.The tightness of the rack to matters,not too tight or too loose,this will damage the chain.Two,stainless steel rack should be kept clean to avoid sunlight and rain soaked,prevent contact with acid and alkaline organic solvents and other substances.This will reduce the corrosion of chain drive parts.Three,when the rack wear seriously should be replaced with a new chain and other parts,in order to ensure a good effect.Never use old or new products together.This results in increased wear and tear.Four,the rack in the work should be timely to add lubricating oil,in order to make the chain work more smooth,fast,reduce wear.This is also the daily maintenance of the matter
Water-soluble media for gear quenching treatment
So let's introduce a term--water-soluble quenching medium,you know?A lot of time,the part of rack can have fine crack,is how to cause?In fact,the main cause of steel parts quenching and cracking is the martensitic transformation(Ms point)at the beginning of the steel and cooling in the following temperature range too fast,so that cracks will appear.Because of this reason,the research and development of water-soluble quenching medium is aimed at reducing the cooling rate of water.Considering that the Ms point of most structural steels is around 300℃during cooling,the cooling characteristics of the water-soluble quenching solution are usually expressed by the cooling rate of the workpiece when it is cooled to 300℃.The water-soluble quenching medium can be used to grade the cooling speed of 300℃for heat treatment workers to choose.There are many kinds of such water-soluble quenching media,among which the PAG type medium has adjustable cooling characteristics and the concentration measurement and control is relatively easy.It is not only suitable for the overall quenching of the rack,also suitable for all kinds of induction heating quenching,and can be used for a long time and stable,both economic and convenient so it is widely welcomed,become the domestic and foreign heat treatment industry widely used water-soluble quenching medium.
What are the main options for rack reference?
(1)the run-out of the gear,the total tooth depth,the common normal line,whether the tooth direction is qualified,the tooth pendulum difference,whether the circumferential pitch error is out of tolerance.
(2)whether the installation distance is suitable after the installation of gear and rack.
(3)the mesh gap of rack and gear should be 0.25*modulus.
(4)whether the total tooth depth,run-out,common normal,especially the tooth direction is qualified.
The rack is also divided into straight rack and helical rack,which are used in pairs with straight gear and helical gear respectively.The tooth profile of the rack is a straight line rather than an involute(a plane for the tooth surface),which is equivalent to a cylindrical gear with an infinite dividing circle radius
Rack process size selection:blank size
The actual size of the parts is 715mm×30mm×28m left 2-3mm margin before rough milling and 2-3mm margin after rough milling so as to leave 0.2-0.3mm margin for fine milling after rough milling so as to leave 0.2-0.3mm margin for fine grinding so as to sum up the blank should be left some machining margin,in order to ensure the normal processing of the workpiece,rough calculation of the blank size length×width×height is 720mm×35mm×33mm.2.2 selection and calculation of cutting parameters,machining allowance and working hour quota.