CN2062671U

CN2062671U - High-speed internal grinding head of static and dynamic pressure bearing

Info

Publication number: CN2062671U
Application number: CN 89221470
Authority: CN
Inventors: 胡惜时; 胡冬阳; 陶志安; 童建辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-12-17
Filing date: 1989-12-17
Publication date: 1990-09-26

Abstract

The utility model relates to the high-speed internal grinding head of a static and dynamic pressure bearing, changing a rolling bearing to a liquid static and dynamic pressure bearing. The utility model is characterized in that front and back bearings of a restrictor arranged on an outer column surface are pressed in two through bearing holes in a sleeve barrel to bear a spindle together; pressure oil flowing through the restrictor form a form a layer of oil film between the spindle and the bearings; on the job, no metal is contacted; so, the utility model has the advantages of stable operation and no noise; the utility model is free from the limitation of the limit speed of the rolling bearing, and the linear velocity of a grinding wheel can be increased to more than 45 metres / second; the utility model is especially suitable for high efficiently grinding bores with high accuracy requirement and bores requiring fine processing to surface roughness.

Description

High-speed internal grinding head of static and dynamic pressure bearing

The utility model belongs to a kind of grinding attachment on the internal grinder, is specially adapted to the workpiece that the required precision of high-efficiency grinding endoporus is very high and the surface roughness requirement is superfine.

Domestic widely used internal grinding head mainly adopts rolling bearing structure at present.Because the restriction that the axis of rolling bears limit speed, grinding speed can only be controlled in 35 meter per seconds, thereby production efficiency is low; And because rolling bearing is that metal directly contacts, noise is big when rotating at a high speed, and bearing wear is serious, thereby needs often to change; Simultaneously, mainly be the metal dots contact during owing to rolling bearing work, rotating accuracy is low, poor rigidity, thereby the inaccessible very high request of bore area crudy.

The purpose of the utility model design is: a kind of high speed internal grinding head is provided, overcomes existing internal grinding head shortcoming, grinding speed is brought up to more than 45 meter per seconds, production efficiency and bore area crudy are significantly improved.

Of the present utility model being characterised in that: changing rolling bearing is the liquid hydrostatic and hydrodynamic bearing, be pressed into the forward and backward bearing in interior two the straight-through dead eyes of sleeve, its external cylindrical surface is provided with flow controller, from the pressure oil of special oil supply system, flow to forward and backward journal bearing and end face thrust bearing continuously through flow controller, main shaft is automatically positioned on the bearing centre position, and limited its axial float, it is simple in structure, and is easily manufactured, reliable operation.

Introduce structure of the present utility model and operation principle in detail below in conjunction with accompanying drawing.

Fig. 1 is a main cutaway view of the present utility model.

Fig. 2 is the A-A profile of Fig. 1.

Fig. 3 is the B-B profile of Fig. 1.

As shown in Figure 1: the main shaft 4 that the front axle throat is provided with shoulder is supported by fore bearing 3 and rear bearing 6, and its axial float is controlled by the front end face of fore bearing 3 and the rear end face of end cap 1.Forward and backward bearing 3 and 6 inner surface all have four equal-sized wedge shape oil pockets, have cut the twice cannelure on the external cylindrical surface, and the face of cylinder diameter between the second ring groove is suitably reduced, to form throttle clearance.Rear bearing 6(sees Fig. 2) with the equidistant part of second ring groove, circumference is divided into the quartering, bore four apertures and communicate with four wedge shape oil pockets respectively.Fore bearing 3(sees Fig. 3) with the equidistant part of second ring groove, circumference is divided into six fens, bore six apertures, wherein four apertures communicate with four wedge shape oil pockets respectively, and two other corresponding aperture communicates with two horizontal apertures that lead to main shaft 4 shoulder end face oil pockets respectively.Adjusting pad 2 is slightly thicker than main shaft 4 shoulders between fore bearing 3 and end cap 1, be used to control the end face oil pocket size of main shaft 4 shoulders.From the pressure oil of oil supply system, the oil duct on sleeve 5 enters the cannelure of forward and backward bearing 3 and 6, enters wedge shape oil pocket and end face oil pocket through throttle clearance and aperture again.Main shaft 4 is in the center under four corresponding mutually wedge shape oil pocket pressure effects.At this moment the fluid in the oil pocket flows out from the bearing both ends of the surface through the bearing clearance, returns oil supply system through spill port and oil returning tube then.

The utility model is because fluid is automatically positioned on the bearing centre position with main shaft, between main shaft and bearing, form the thicker oil film of one deck, there is not Metal Contact during work, it is the neat liquid friction, thereby running steadily, noiselessness, and be not subjected to the restriction of rolling bearing limit speed, grinding speed can be brought up to more than 45 meter per seconds, production efficiency can improve more than 30%, and because this bearing is the neat liquid friction, the bearing long-term work does not have wearing and tearing, need not frequent replacing, can save a large amount of maintenance costs and maintenance time.Simultaneously, because main shaft is that the whole face of cylinder contacts with bearing by oil film, and bearing employing wedge shape oil pocket, have very high dynamic pressure effect during high speed rotary, thereby the spindle rotation accuracy height, good rigidly can improve the bore area crudy greatly.

The utility model is not only applicable to internal grinding, and is applicable to boring, drilling and other mechanisms of rotating at a high speed.

Claims

1, a kind of hydrostatic and hydrodynamic bearing high speed internal grinding head that is used for internal grinder, form by sleeve 5, end cap 1, adjusting pad 2, main shaft 4 and forward and backward bearing 3 and 6 etc., it is characterized in that: the forward and backward bearing 3 and 6 that external cylindrical surface is provided with flow controller is pressed in sleeve 5 interior two straight-through dead eyes, supporting the main shaft 4 that the front axle throat is provided with shoulder jointly, its shoulder is limited between fore bearing 3 and the end cap 1.

2, internal grinding head according to claim 1, it is characterized in that: preceding, rear bearing 3 and 6 inner surface all have four equal-sized wedge shape oil pockets, cut the twice cannelure on the external cylindrical surface, face of cylinder diameter between the second ring groove is suitably reduced, rear bearing 6 with the equidistant part of second ring groove, circumference is divided into the quartering, boring four apertures communicates with four wedge shape oil pockets respectively, fore bearing 3 with the equidistant part of second ring groove, circumference is divided into six fens, bore six apertures, wherein four apertures communicate with four wedge shape oil pockets respectively, and two other corresponding aperture communicates with two horizontal apertures that lead to main shaft 4 shoulder end face oil pockets respectively.

3, internal grinding head according to claim 1 is characterized in that: the adjusting pad 2 between fore bearing 3 and end cap 1 is slightly thicker than the shoulder of main shaft 4.