Controlled-Force Grinding—A New Technique for Precision Internal Grinding

Abstract

The causes of random-size variations and random-taper variations in feed-rate grinding are described and related to stock variations and wheel-sharpness variations. A new technique, controlled-force grinding, is presented which eliminates errors resulting from variable elastic deflections. An analysis is made of the rounding-up dynamics of the controlled-force system and a critical workspeed is found which must be exceeded in order to have a rounding-up action. A study is also made of the stability of the system using the Nyquist criterion.

<title>The flexible grinding technology based on the electric current control</title>

“…The debugging results show that the higher the system is reliable and grinding accuracy, the better for grinding PCB with low rigidity [9,10]. The model in the combination of electric control scheme which mainly consists of PLC & touch screen and mechanical technology is a better scheme to grind PCB , and it has the advantages of compact construction, highautomation and high-efficiency; furthermore, it makes a high maintainability and agility for the brushing machine.…”

“…Thus, according to Equation (5) we can conclude that the grinding force can be kept invariable through adjusting current value, so that it can keep grinding uniformity for PCB and improve grinding accuracy [9,10].…”

Grinding force control in an automatic surface finishing system

“…Hahn [3] was the first person to propose the idea of controlled-force grinding. This has the advantage of eliminating errors due to machine deflections.…”

Modelling and simulation of an automatic grinding system using a hand grinder

“…It is known that force control may improve grinding results of mould and dies [1,2,3,4,5,6], and hence force control has become an important procedure for grinding and surface finishing processes. Recently, electric hand grinders have become popular surface finishing tools of moulds and dies.…”