CN203395021U

CN203395021U - Mixed ceramic ball bearing

Info

Publication number: CN203395021U
Application number: CN201320309102.2U
Authority: CN
Inventors: 徐辉
Original assignee: SHANGHAI GAOYUE CERAMICS Co Ltd
Current assignee: SHANGHAI GAOYUE CERAMICS Co Ltd
Priority date: 2013-05-30
Filing date: 2013-05-30
Publication date: 2014-01-15
Anticipated expiration: 2023-05-30

Abstract

The utility model discloses a mixed ceramic ball bearing. The mixed ceramic ball bearing comprises an outer ring, an inner ring, a rolling ball and a holding frame, wherein grooves are arranged on each of an inner ring surface of the outer ring and an outer ring surface of the inner ring; the rolling ball is embedded to the grooves of the outer ring and the inner ring by the holding frame; materials of the outer ring and the inner ring are bearing steel or stainless steel materials; the material of the holding frame is polytetrafluoroethylene; the rolling ball is formed by sintering silicon carbide powder through a hot isostatic pressure sintering process, and internally distributed with a plurality of irregular and fine foaming holes; a fine grinding surface layer is provided on the outer surface of the rolling ball; the zirconium oxide ceramic bearing ball has ball diameter variation amount of 0.13 VDWI-5VDWI, spherical error of 0.08 RW-2.5RW and surface roughness of 0.010 Ra-0.1Ra. Compared with a steel bearing, the mixed ceramic ball bearing disclosed by the utility model has the advantages of being long in service life, self-lubricated, high in rotation speed and low in noise, corrosion resistant, high temperature resistant, free of magnetism and electrically-insulated.

Description

A kind of hybrid ceramic ball bearing

Technical field

The utility model relates to the high-precision bearing in a kind of mechanical transmissioning technology field, especially for a kind of hybrid ceramic ball bearing accurate, high-speed machine tool main shaft.

Background technique

Bearing is the complete sets of basic equipment part of modern machine, it is the foundation stone that machine finish index guarantees, its performance can directly have influence on rotating speed, rotating accuracy, rigidity, trembling vibration cutting ability, noise, temperature rise and the thermal distortion of lathe, and then has influence on precision, the surface quality of processing accessories.In traditional machinery or common mechanical, rotating speed mainly forwards several thousand revs/min at hundreds of.Along with the fast development of Numeric Control Technology, " compound, at a high speed, intelligence, accurate, environmental protection " become the main trend of current machine tool industry technical development because, High-speed machining can effectively improve lathe work efficiency, shorten process-cycle of workpiece.Modern High-Speed working machine tool, spindle speed requires to reach several ten thousand and forwards tens0000 revs/min to.This just requires machine tool chief axis and associated components thereof will adapt to the demand of High-speed machining, and relating to of bearing proposed to brand-new requirement.If the high-speed adaptability of bearing is bad, the temperature rise meeting of axis system is very serious, even can burn inefficacy to death.Therefore, high performance lathe must the high performance bearing of adapted.The precision of bearing can be divided into P0, P6, P5, P4 and five grades of P2, the form and position tolerance such as the circular runout of main shaft bearing, end face run-out, rolling element diameter are inconsistent has a strong impact on the precision of axis system and workpiece thereof, for the bearing accuracy on modern machine main shaft should for P5 and more than, and for numerical control machine tool, machining center etc. at a high speed, the main shaft bearing of high-precision machine tool, need to select P4 and above high-precision bearing thereof.Due to machine tool mainshaft bearing highi degree of accuracy, at a high speed, high reliability request, rolling element material is had to some specific (special) requirements, and the rotating speed of general bearing steel rolling body bearing and temperature rise, life-span and bearing capacity, rigidity and vibration resistance, noise can not meet the requirement of modern machine.

Model utility content

Technical problem to be solved in the utility model is to provide a kind of hybrid ceramic ball bearing for above-mentioned the deficiencies in the prior art.

Technical problem to be solved in the utility model can be achieved through the following technical solutions:

A kind of hybrid ceramic ball bearing, comprise outer ring, inner ring, spin and retainer, on the inner ring surface of described outer ring and the outer ring surface of inner ring, be provided with groove, described spin is embedded in the groove of described outer ring and inner ring by described retainer, the material of described outer ring, inner ring is Bearing Steel or stainless steel material, and the material of described retainer is teflon; Described spin adopts silicon carbide powder to form through HIP sintering technique sintering, and its inside is distributed with many irregular tiny foam holes, and outer surface has one deck lappingout surface layer, the ball diameter variation 0.13～5V of this zirconia ceramics bearing ball _dWI, deviation from spherical form is 0.08～2.5R _w, surface roughness 0.010～0.1Ra.

Hybrid ceramic ball bearing of the present utility model is compared with steel bearing, and tool has the following advantages:

1, the life-span is long: due to silicon carbide ceramics ball density low (be about steel ball 40%), when running up, centrifugal force is little, and raceway load reduces, thereby greatly increases its working life, and hybrid ceramic ball bearing is 4～6 times of common steel bearing life.

2, selflubricating: silicon carbide ceramics bearing ball has certain self-lubricating function, the working life that therefore certificate is longer under the harsh rugged environments such as dry friction is also by low maintenance difficulties.

3, high rotating speed, low noise: because silicon carbide ceramics ball has high abrasion, the features such as low coefficient of friction, low bulk and lightweight, in application, silicon carbide ceramics ball bearing can reach higher rotating speed, its limit speed is 2～3 times of common steel bearing, be applied to high-speed, high precision numerical control machine tool, the fields such as electric main shaft.

4, corrosion-resistant: because silicon carbide ceramics ball has natural corrosion-resistant function, under the corrosive environments such as strong acid, highly basic, salt, to work.

5, high temperature resistant: silicon carbide ceramics ball can be worked under 1000 ℃ of environment.

6,, without magnetic, electrical insulation: silicon carbide ceramics ball has or not magnetic, electric insulation functions, can under requiring without magnetic, insulation environment, work.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model silicon nitride all-ceramic bearing.

Fig. 2 is the structural representation of the utility model spin.

Fig. 3 is the internal structure schematic diagram of the utility model spin.

Embodiment

Below in conjunction with meeting with embodiment, further describe the utility model.

Referring to Fig. 1, the silicon nitride all-ceramic bearing providing in figure, comprise outer ring 100, inner ring 200, spin 300 and retainer 400, on the inner ring surface of outer ring 100 and the outer ring surface of inner ring 200, be provided with groove 110,210, spin 300 is embedded in the groove 110,210 of outer ring 100 and inner ring 200 by retainer 400, the material of outer ring 100, inner ring 200 is Bearing Steel or stainless steel material, and the material of retainer 400 is teflon.

Referring to Fig. 2 and Fig. 3, spin 300 adopts silicon carbide powder to form through HIP sintering technique sintering, its inside is distributed with many irregular tiny foam holes 310, outer surface has one deck lappingout surface layer 320, ball diameter variation 0.13～the 5VDWI of this zirconia ceramics bearing ball, deviation from spherical form is 0.08～2.5RW, surface roughness 0.010～0.1Ra.

Claims

1. a hybrid ceramic ball bearing, it is characterized in that, comprise outer ring, inner ring, spin and retainer, on the inner ring surface of described outer ring and the outer ring surface of inner ring, be provided with groove, described spin is embedded in the groove of described outer ring and inner ring by described retainer, the material of described outer ring, inner ring is Bearing Steel or stainless steel material, and the material of described retainer is teflon; Described spin adopts silicon carbide powder to form through HIP sintering technique sintering, and its inside is distributed with many irregular tiny foam holes, and outer surface has one deck lappingout surface layer, the ball diameter variation 0.13～5V of this zirconia ceramics bearing ball _dWI, deviation from spherical form is 0.08～2.5R _w, surface roughness 0.010～0.1Ra.