Study On The Quality Control And Improvement Of Inner Tyre Production Line

The subject mainly research: applying statistics process control(SPC) principle andcontrol chart, controling the half-product quality of inner tvre production line chiefworking procedure including rubber material,inner tyre extrude,forming andsulphuric inner tyre. According to the result of control, we improve the unsteadyworking procedure until each working procedure steady. At last, we increase the qualityof inner tyre, reduce cost, raise the economy benefit of enterprise.The quality control of rubber material: analyze the rubber's proportion andhardness, through the printed dot of average-extreme control chart, we can see rubberquality steady dearly or not. applying new technologe,new material,newmanagement, we put up the improvement system of rubber quality and improve thefunction of the rubber material.Inner tyre extruding working procedure: control the size including tyre matterinner thickness,outer thickness,width and longth, according to the average-extremecontrol chart, we find the width and length of tyre matter unsteady, the main reason isthat the speed of extrude machine is not steady and cool speed is not very good.reforming them, we use the average-extreme control chat again, the width and longth oftyre matter are both steady. That is our purpose.Inner tyre forming working procedure: applying the average-extreme control chat,analyzing the half-product quality, we find that the half-product is unsteady. The mainreason is that the function of welding machine is unsteady. we remold the PLCcontrol of the welding machine, we also increase the quality of half-product, the controlchart is steady.Sulphuric inner tyre working procedure: according to the control chart,thehalf-product quality of sulphuric inner tyre working procedure is unsteady. The mainreason of the quality's unsteady is that the control function of sulphuric machine is notgood, it makes the rubber sulphuric effect not obey. according to reforming the controlof the sulphuric machine, the sulphuric quality of the inner tyre working proceduring hasimproved, the control chat is steady.In order to make the quality control system of inner tyre working procedurevigourous, we must have the competence of improvement and adapting reform.Consequently, establish the quality improvement system of inner tyre workingprocedure, upgrade the working procedure, raise the product quality continually.Through the quality control and improvement of the inner tyre production line eachworking procedure, the qualified percent of the inner product heighten to a great extent,form 97 percent to now more 99.5 percent, raw material also reduces and come intobeing very good economy benefit.