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Home Industrial Technologies New Highly Effective Technologies of Grinding of Hard-to-Machine Materials

New Highly Effective Technologies of Grinding of Hard-to-Machine Materials

Description

Idea of the development is based on decreasing energy and force parameters of chip formation due to providing conditions for the utmost adsorption interaction of juvenile strips on the cutting zone surface with cutting fluid components. It helps reducing energy of plastic deformation, formation of a new surface and considerable reducing of adhesive phenomena by improving kinematics of shaping process.

Innovative Aspect and Main Advantages

Depending on curvature of a work surface, rotary part drive or abrasive tool can be subjected to modernization.

During circular or circular shaped grinding of parts’ surfaces with a diameter up to 30 mm and curvilinear parts’ surfaces (turbine buckets, camshafts) a group production in devices of drum type is carried out. In such a way portable travel of parts by circular path around common axis with controllable turning around planetary pivot pin is provided.

Grinding and deep grinding of flat and flat-shaped surfaces implies using special multi-spindle planetary-grinding instrument. It is mounted on the grinding stock spindle instead of an abrasive wheel. Abrasive wheels are fastened hard on planetary spindles and gain translational motion around center line of machine spindle and rotation around planetary axes with preset speed ratio. Standard abrasive wheels of straight profile or cup wheels of medium structure are used as cutters. Grade of grinding wheels is accepted higher than traditionally recommended.

The developed methods provide:

  • Reducing specific energy consumption by 3 to 10 times;
  • Increasing specific intensity by 5 20 and more times;
  • Increasing productivity of machining by 2,5 5 times;
  • Reducing consumption of liquid coolant by 5 10 times;
  • Reducing abrasive discharge intensity by several times;
  • Reducing loading during machining of high-plastic and ductile materials;
  • Cutting zone temperature is bellow 1000C, that entirely excludes grinding defects caused by thermal factor.

Areas of Application

Low-cost modernization of multi-purpose and special grinding machines without modification of main motion drive for technological enhancement of equipment.


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Fig. 4

Stage of Development

Several pilot and experimental-industrial models for group grinding have been developed: cylindrical production of small diameter (fig.1), turbine blade profiles with length up to 500 mm, centering plugs and camshafts up to 600 mm length, and also planetary-ganged and planetary grinding (fig.4) of flat and flat-profiled surfaces, deep grinding of jumbo size flat surfaces (Fig.3). Conducted tests revealed high efficiency and technological succession of the new methods of grinding.

Contact Details

A.N. Podgorny Institute for Mechanical Engineering Problems NAS of Ukraine
Contact person: Tarelin Anatoliy Alexeyevich, Corp. Member of NASU
Address: 2\10, Pozharsky str., 61046, Kharkiv, Ukraine
Tel.: (+38 0572) 959 609
Fax: (+38 0572) 944 635, (+38 0572) 942 744
E-mail: tarelin@ipmach.kharkov

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