Хонинговальные головки

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 […]

The selection of the appropriate load/unload mechanism is a major source of cycle time savings. Options include: • Through-the-work-spindle loading. Small parts are fed through the workhead into a chuck. Each new part ejects the preceding part that falls or is held by a receiving arm. Grinding resumes as soon as the ground part and […]

The support surface of a workrest should be harder than the workpiece. The workrest also has to be tough and capable of withstanding the knocks encountered on the factory floor. The wear-resistant surface of the workrest is selected according to the types of work material ground. For steels, tungsten carbide inserts provide a suitable surface. […]

Three grinding wheels listed in Table 19.5 were each tested using an L827 orthogonal array to determine the most favorable conditions. The aluminum oxide wheel listed having 42% porosity gave better results than a number of other aluminum oxide wheels tested for grinding Inconel 718. The CBN wheels listed also had increased porosity, 40% compared […]