CN2187091Y

CN2187091Y - Revolving centre for grinding rolls

Info

Publication number: CN2187091Y
Application number: CN 94205478
Authority: CN
Inventors: 李金利
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-26
Filing date: 1994-03-26
Publication date: 1995-01-11
Anticipated expiration: 2004-03-26

Abstract

The utility model relates to a revolving centre for grinding rolls. A whole centre is composed of a centre head, a centre neck and a centre body. The utility model is characterized in that the revolving centre body is inserted in a protective casing (5); a No 8000 bearing ball (7), a No 2000 bearing, a retainer (4) and a No 7000 bearing taper sleeve (6) are arranged on the upper part of the casing and are fixed with a front cover with a dust seal by screws. Five groups of bearings (10), retainers (9) and distance sleeves (8) are orderly arranged between the center body and the casing, the back cover is assembled by screws, and the assembly of the revolving center is completed. The utility model has the advantages that the working rotation speed is accelerated, the amount of feed is large, the work can be carried out continuously, the precision is high, the man-hour efficiency is improved, and the labour intensity is reduced.

Description

Revolving centre for grinding rolls

The utility model relates to the Machining Technology field, a kind of mill processing roll live center.

At present, at home and abroad the processing of breaker roll all is to adopt the back dead centre top tight workpiece in the machining, though the back dead centre simple structure can be born the large-tonnage load, machining accuracy is higher, has following shortcoming from reality is used:

1, roll must respectively tumble in a center hole at its two ends before mill processing.This hole technological requirement height, cost is big, about 600 yuan of present every pair of cost.

2, roll must to reduce the friction temperature, reduce top and wearing and tearing apical pore constantly to two ends apical pore filling lead oil in grinding processing.

3, in the mill processing of roll, though taked many protective measures, because the friction of big load relative motion, top and wearing and tearing apical pore are unavoidable.This just is easy to cause roll two ends apical pore and top wearing and tearing.In case wearing and tearing occur, then must shut down and repair, thereby cause the waste in man-hour and the increasing of labour intensity.Particularly in last several roads mill processing of roll, the appearance of above-mentioned situation will cause the generation of substandard products or waste product, wastes huge.

4, top and apical pore grinds the wearing and tearing that all will be subjected to basically when machining in various degree at roll.Thereby brought very big difficulty for the maintenance and the reparation of user's breaker roll, thus, some rolls have to transport at a distance return-to-factory reparation again.

Defective designs a kind of mill processing roll live center to the purpose of this utility model in order to overcome as above exactly, can make the processing faster rotational speed, the operation of turning round continuously, and precision height, live center use almost not wearing and tearing.

Described mill processing roll is formed according to such principle with live center technical pattern, and object and metal material are being subjected to temperature, under the external force effect, rising-heat contracting-cold takes place,---stablizing---process of deformation again that can produce deformation.Therefore live center has adopted the live center neck; top body device is in the protection housing; assembling is with rolling bearing (7) between protection housing and the top neck; No. 2000 bearings and retainer (4); No. 7000 bearing tapered sleeves (6); be covered with dust and protecgulum tightens assembling with screw by having, adopt five groups of bearings (10) and retainer (9) separation sleeve (8) assembled in sequence between the top body part of live center and the protection housing, compress with the bonnet screw then.

Described mill processing roll is with leaving the gap between No. 2000 bearings of top neck portion of live center and retainer (4) and the protection housing; No. 7000 bearing tapered sleeves (6) have the taper fit of 1:15 with top neck, and bearing tapered sleeve (6) has certain clearance with the top shoulder of going up.

Owing to adopted as above structural improvement, live center of the present invention was once tested in two, five subsidiary factories of Xingtai metallurgical machinery processing factory of Chinese Ministry of Metallurgical Industry, had successively machined the roll of 18 different tonnages, had following advantage:

1, mill processing rotating speed speeds, 13-17 rev/min of back dead centre mill processing rotating speed average out to, and live center then is 20 rev/mins.

2, feed is big: the back dead centre mill processing depth of cut is generally 0.03-0.04mm, and the live center depth of cut is 0.05-0.06mm,

3, the operation of turning round continuously: need often to shut down in the processing of back dead centre mill and carry out apical pore and appraise and decide.Live center then can be gone to bed till the roll mill machines running continuously from roll.At present, the test tidemark is running continuously 12 hours.

4, man-haur efficiency improves, and labour intensity alleviates, and auxiliary material consume almost nil.Mainly show as: the roll two ends do not need to inlay apical pore again.Do not need again ceaselessly to the apical pore oiling of roll two ends in the mill processing.Also reduced simultaneously in the mill processing constantly apical pore, top editing.Inferior, the percent defective of product reduce greatly.

5, precision height.Tolerance, form and position tolerance reach national specification requirement in twice.

6, live center wearing and tearing in use are almost nil.

Below in conjunction with the description of drawings specific embodiment of the utility model:

1-live center as shown in FIG.; The loam cake that the 2-band is covered with dust; The 3-holding screw; 4-2000 bearing and retainer; 5-protects housing; 6-7000 bearing tapered sleeve; The 7-8000 bearing; The 8-separation sleeve; The 9-retainer; Five groups of bearings of 10-; The 11-bonnet.

With No. 8000 bearings (7), No. 2000 bearings and retainer (4), No. 7000 bearing tapered sleeves (6) the protection housing top of packing into; With five groups of bearings (10) and protector (9), separation sleeve (8) number is packed in the protection housing in order, and top (1) is inserted in the housing from top to bottom, tightens bonnet, will have the protecgulum that is covered with dust with the top and housing of bolting.

Roll is pressed in the use with live center; because of being subjected to axial force and radial load effect meeting strain to occur; No. 2000 bearings this moment (4) can play strong point effect; and five groups of No. 2000 bearings in the protection housing bear because of strain role power; and then eliminate distortion, exempt from out tired motion.

Roll all adopts assembling movingly with live center each several part bearing, and transfer interference fits in the running gradually to, five groups of No. 2000 bearings in the protection housing produce the temperature difference that friction occurs at the volley: C10 °-15 °, the diameter of axle of live center can produce the 0.0072～0.01mm that rises that splashes, because grinding machine center hole external volume is big, is difficult for splashing and rises; The gap of No. 2000 bearings in protection housing top; bearing tapered sleeve (6) and the top taper fit that adopts 1:15; the 0.3mm gap is left on top; when running produces heat; add the top axial force that receives; the gap of the 0.3mm that top and bearing tapered sleeve (6) are anterior dwindles gradually, and bearing tapered sleeve (6) external diameter increases, and No. 2000 bearings and retainers (4) transfer interference fits to gradually with protection housing (5) combinational gap.Use through long-term, No. 2000 bearings and retainer (4) increase with the containment vessel body space, and No. 7000 bearing tapered sleeves are under temperature and responsive to axial force, and reach automatically is zero up to the gap.Can pull down disintegration with live center and manually readjust this moment.

Claims

1; a kind of mill processing roll live center; by centre head; top neck; top body is one-body molded; of the present utility model being characterised in that: described roll has adopted centre head with live center; neck; top body one is packed in the protection housing (5); assembling is with rolling bearing (7) between protection housing and the live center neck; No. 2000 bearings and retainer (4); No. 7000 bearing tapered sleeves (6); tighten assembling by having the protecgulum that is covered with dust with screw, adopt five groups of bearings (10) and retainer (9), separation sleeve (8) between the top body part of live center and the protection housing; assembled in sequence loads with the bonnet screw then.

2, mill processing roll live center as claimed in claim 1; it is characterized in that: leave the gap between No. 2000 bearings of the top neck portion of described live center and retainer (4) and the protection housing; No. 7000 bearing tapered sleeves (6) have the taper fit of 1:15 with top neck, and bearing tapered sleeve (6) is gone up shoulder with the top certain clearance.