Хонинговальные головки

A simplified linear dynamic grinding system can be represented by masses, springs, and elements. Based on the following simple grinding force model, which says that the normal grinding force Fn is proportional to the material removal rate damping (8.3)   where X is constant, b is grinding width, vw is workpiece speed, vs is grinding […]

10.4.1 Introduction In many cases, mineral oils are used as the base material for cooling lubricants. Mineral oil bases consist of hydrocarbons with mostly paraffinic, naphthenic, or aromatic structures. Depending on the fraction of the paraffins, naphthenes, and condiments, a distinction can be made between paraffin-based, naphthene-based, and mixed base oils [Mang 1983, Moller and […]

In any grinding process mechanical, thermal, and even chemical effects are usually superimposed in the zone of contact. Grinding in any variation is generating a significant amount of heat that may cause a deterioration of the dimensional accuracy of the workpiece, an undesirable change of the surface integrity, or lead to increased wear of the […]

13.1 INTRODUCTION 13.1.1 Grindability Workpiece material composition and condition control all aspects of the grinding process. As ever greater demands are placed on productivity and quality, it becomes critical that the engineer understands the metallurgy of the materials being ground and their impact on the grinding process. Grindability is the term used to describe the […]

ELID is a new technique that uses electrolysis to remove bond material. The application of this dressing technique during the course of a grinding process allows chips and debris to be removed easily and allows grindability to be maintained over a long period of time. Various applications of ELID grinding have been developed. With ELID […]

A ballscrew (or recirculating ball leadscrew) is at the heart of a controlled linear-motion system. It is a precision-ground hardened steel or stainless steel threaded shaft on which a ballnut rides with rolling contact to provide a positive, high efficiency of transmission and low friction. The ballscrew is manufactured by turning, heat treating, and then […]

Diamond roll dressing was introduced in the 1960s and has been growing in usage until it now represents the commonest dressing method for the majority of profiled and flat grinding applications, and virtually all vitrified CBN applications. Nevertheless, it often remains just an option on new grinders still designed primarily for stationary dressers or a […]

The process variants up — and down-grinding can be set in the case of creep feed grinding, using the favorable alternative for the particular machining conditions. If the vectors of the cutting and feed motion have the same direction at the contact point of abrasive grain and material, the process is defined as down-grinding. In […]

Grinding with segments represents the rough, high stock removal end of the flat grinding spectrum. The machine can be very large with powerful motors. The largest recently had a 200-diameter chuck, 117-diameter grinding wheel, and a 600-hp wheel drive custom built for a company to manufacture saws [Anon. 1995]. The majority of segment grinders have […]

Taking both the beneficial and negative impacts of high speed, Table 17.2 gives the maximum stock removal rate as a function of wheel width for a 10-kW spindle. TABLE 17.2 Maximum Stock Removal Rates as a Function of Wheel Width At 160 m/s, to reap benefits from the high speed, the spindle power requirement is […]