CN101709741A - Asymmetrical multi-subdivision bearing and manufacture process thereof - Google Patents

Abstract

The invention relates to the field of large-size pivoting support products, in particular to an asymmetrical multi-subdivision bearing and a manufacture process thereof. The asymmetrical multi-subdivision bearing is characterized in that an inner ring and an outer ring are of asymmetrical subdivision structures formed by connecting a plurality of sections of arc plates; the inner ring and the outer ring spliced by the arc plates respectively form closed round roller paths, and a retaining frame is arranged between the roller paths; rollers are uniformly and non-uniformly arranged on the retaining frame; and a rolling body drives the retaining frame to do rotary motions. The processing process of the inner ring, the outer ring and flanges comprises the following steps of: (1) forging and annealing; (2) carrying out machining, roll curving and stabilizing treatment; (3) tempering and shaping; (4) preliminarily working; (5) carrying out induction hardening on a working surface; and (6) finishing. Compared with the prior art, the invention effectively solves the problems of relevant links of processing, transport, assembly, maintenance, and the like of large-size bearings.

Description

Asymmetric multi-subdivision bearing and preparation process thereof

Technical field

The present invention relates to the large-size pivoting support product scope, relate in particular to the asymmetric multi-subdivision bearing and the preparation process thereof of a kind of structure and technology novelty.

Background technique

The large-size pivoting support product is widely used in fields such as wind-power electricity generation, yard craft, mining machinery, military project, along with the raising of technology and the changes in demand in market, demand for large-sized pivoting support product is increasing, in the prior art, large-sized pivoting support mostly is overall structure, when swing diameter surpassed 5 meters, the processing of its blank and finished product and transportation all existed a lot of inconvenient.

Summary of the invention

The purpose of this invention is to provide a kind of asymmetric multi-subdivision bearing, this bearing is convenient to transportation, assembling with the form that the large scale bearing is designed to cut open more, and easy to maintenance.

For achieving the above object, the present invention is achieved through the following technical solutions:

Asymmetric multi-subdivision bearing, comprise inner ring, outer ring, rolling element, rolling element is arranged on the retainer between inner ring, the outer ring, it is characterized in that, the asymmetric subdivision structure that described inner ring, outer ring connect and compose for the multistage arc plate, the inner ring that some arc plates are spliced, outer ring are formed the closed circle raceway respectively, the inner ring raceway both sides are provided with rib, be provided with retainer between the raceway, even or non-homogeneous being arranged on the retainer of roller, rolling element drives retainer and rotates.

Adopt obtuse angle diagonal built Placement between described two adjacent arc plates.

Described retainer adopts the flexible chain plank frame.

The manufacturing process steps of described inner ring, outer ring, rib is as follows:

1) forges, anneals, wear-resisting metallic material is forged into blank, 650 ± 20 ℃ of annealing temperatures, holding time 10～12 hours, 300 ± 20 ℃ of tapping temperatures;

2) machining, roll Qu Jiagong, stabilization, blank is machined to requires size, roll the circular arc plate that Qu Jiagong obtains having requirement curvature, 200 ± 10 ℃ of stabilization temperature, time 6～8h;

3) modified, shaping is inserted shaping mould with the circular arc plate and is carried out die quenching, is heated to 860 ± 20 ℃ of temperature, carry out shaping after the quenching immediately and handle, amount of deformation is detected and repairs, adopt high-temperature tempering then, 560 ± 10 ℃ of temperature, 8～10 hours time, hardness 260～300HB;

4) preliminary working makes workpiece reach the size and dimension of designing requirement through machining;

5) working surface induction hardening, depth of hardening 15～20mm, direct current (d.c.) 500A, tank circuit voltage 500V carries out shaping immediately and handles after the quenching, low-temperature tempering, 170 ± 10 ℃ of temperature, 8～10 hours time, working surface reaches hardness 58～60HRC;

6) finishing is worked into finished size with boundary dimension, bores mounting hole, repaiies chamfering, the raceway polishing.

Compared with prior art, the invention has the beneficial effects as follows: efficiently solve the difficult problem of relevant links such as the processing of large scale bearing, transportation, assembling, maintenance, for the design and the manufacturing of all kinds of big machineries are laid a good foundation.

Description of drawings

Fig. 1 is the structural front view of asymmetric multi-subdivision bearing;

Fig. 2 is the A-A rotation enlarged view of Fig. 1;

Fig. 3 is inside and outside circle splicing schematic representation.

Fig. 4 is that the rib on the inner ring is arranged schematic representation.

1-inner ring 2-outer ring 3-carrier bar 4-rolling element 5-arc plate 6-chain rivet 7-bearing pin among the figure

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further:

See Fig. 1, Fig. 2, Fig. 3, asymmetric multi-subdivision bearing, the retainer that is made of inner ring 1, outer ring 2, rolling element 4, carrier bar 3, chain rivet 6 and bearing pin 7 constitutes, and the rolling element 4 between inner ring 1, the outer ring 2 is realized the rotation of big machinery and the transmission of radial load.See Fig. 3, the subdivision structure that inner ring 1, outer ring 2 connect and compose for multistage arc plate 5 leave the gap of 1.5～0.1mm between two adjacent arc plates, and partition patterns is a non-symmetry structure.Interface line has 6 °～20 ° left and right sides angles with the bearing center line, can guarantee rolling element 4 steadily to roll across interface and not produce to impact and noise, because interface band angle, the asymmetric shape of arc plate and gap are also very favourable to the maintenance of installing, debugging reaches in use.

Adopt obtuse angle diagonal built Placement between two adjacent arc plates 5, be separately fixed at the position that big machinery need rotate.The linkage structure of bearing pin 7 and carrier bar 3 can realize the even distribution of rolling element 4 at circumferencial direction, and the rib of inner ring 1 is done PURE ROLLING at circumferencial direction guiding rolling element 4.

Rolling element 4 rolling surfaces adopt full convexity cydariform roller, can effectively reduce and install and make the end stress concentration phenomenon that the axis deviation that produces causes.

The manufacturing process steps of the inner ring in the embodiment of the invention, outer ring, rib is as follows:

1, processing inner ring, outer ring:

1.1 assembly forging, annealing, preliminary working, bending, modified+shaping: the blank forging that at first with material is 42CrMo becomes cuboid; 650 ± 20 ℃ of annealing temperatures, 10～12 hours time, 300 ± 20 ℃ of tapping temperatures; With width and short transverse milling to requiring size, ultrasonic flaw detection; Machinery rolls song and is machined to and requires curvature, obtains one section circular arc plate; Modified+shaping, be heated to 860 ± 20 ℃ of temperature, the band shaping mould carries out die quenching, detects amount of deformation, repairs the excess distortion on apparatus for shaping, high-temperature tempering, 560 ± 10 ℃, 8～10 hours time, hardness 260～300HB;

1.2 preliminary working: aforementioned operation is obtained arc plate be filled on the processing mold, carry out preliminary working, the milling internal and external cambered surface is to certain size, and the milling height is to certain size; At one end extract the material core and be used for doing mechanical test; 200 ± 10 ℃ of stabilization temperature, time 6～8h; Preliminary working for the second time, milling internal and external cambered surface are to certain size, and the milling height is processed the rib groove to certain size;

1.3 raceway face heat treatment: workpiece is filled on the induction hardening lathe of particular design, adjusts track curvature, adjust workpiece motion s speed, because raceway is very wide,, outer arced surface groove portion branch is quenched so inductor, cooling unit, power supply etc. have been carried out the redesign coupling, depth of hardening 〉=15mm, direct current (d.c.) 500A, tank circuit voltage 500v carries out shaping immediately after quenching and handles, low-temperature tempering, 170 ± 10 ℃ of temperature, 8～10 hours time, working surface reaches hardness 58～60HRC;

1.4 finishing: detect cambered surface curvature, workpiece is filled to sawing machine, the two ends hypotenuse is amputated (leaving amount of finish) along skewed slot; Workpiece is moved on the machine dies, the milling height is to certain size again; Connect the bistrique axle on the CNC planer type milling machine main shaft, the grinding outer arced surface is to certain size (raceway face dye-penetrant inspection), and the milling intrados is to certain size; Milling rib groove; Milling arc length direction two ends hypotenuse interface; 170 ± 10 ℃ of stabilization temperature, time 6～8h; The milling height is to finished size, and the grinding outer arced surface is to finished size, and the milling intrados is to finished size; Milling rib groove is to finished size; Milling two ends hypotenuse is interfaced to final size, stays the gap to be not more than 1mm between the two adjacent inner ring assemblies; Boring: on the short transverse both ends of the surface, bore erection opening, bore upper and lower two row's mounting holes along arc surface; Repair chamfering: repair chamfering everywhere, the interface hypotenuse is repaiied the transition slope; Polishing: raceway is carried out polishing treatment with the abrasive belt buffing machine; The difference of outer ring and inner ring is no rib groove, and raceway is on intrados.

2, processing rib:

2.1 the forging of rib assembly, annealing, famine are milled, cut apart, bending forming, modified+shaping: the blank forging that at first with material is 42CrMo becomes cuboid (8 are closed forging); 650 ± 20 ℃ of annealing temperatures, 10～12 hours time, 300 ± 20 ℃ of tapping temperatures; To requiring size, length direction temporarily keeps former length, ultrasonic flaw detection with width and short transverse milling; Band saw is cut apart (4 portions), mills and divides face equally, and band saw is cut apart (2 portions), with width and short transverse milling to requiring size; Machinery rolls song and is machined to and requires curvature, obtains one section circular arc lath; Modified+shaping, be heated to 860 ℃, the band shaping mould carries out die quenching, detects amount of deformation, repairs the excess distortion on apparatus for shaping, and 560 ± 10 ℃, 8～10 hours time, hardness 260～300HB;

2.2 preliminary working: aforementioned operation is obtained the arc lath be filled on the processing mold, carry out preliminary working, the milling height is to certain size, the milling internal and external cambered surface is to certain size, each workpiece can be considered back-to-back 2 rib assemblies, promptly wherein on the short transverse end flat be respectively the working surface of a rib assembly; Cutting Length (arc length) direction is to certain size;

2.3 working surface heat treatment: workpiece is filled on the induction hardening lathe of particular design, adjust track curvature, adjust workpiece motion s speed, sliding contact surface (working surface) is carried out induction hardening, carry out shaping after both ends of the surface are quenched respectively immediately and handle low-temperature tempering, 170 ± 10 ℃ of temperature, 8～10 hours time, working surface reaches hardness 58～60HRC;

2.4 finishing: detecting cambered surface curvature, workpiece is filled to sawing machine, is two-part (leaving amount of finish) along the middle symmetry plane of two working surfaces with work piece cut, and each part can be processed into 1 rib assembly; Workpiece is moved on the machine dies, mill and divide face (non-basal plane) equally, mill flat working surface, the working surface dye-penetrant inspection, the non-basal plane of milling is to finished size again; The milling internal and external cambered surface is to finished size, and seam is installed in milling, and milling arc length direction two end interfaces stay the gap to be not more than 0.5mm between the two adjacent rib assemblies; Boring: the short transverse end face bores erection opening, bores mounting hole along cambered surface; Repair chamfering: repair chamfering everywhere, the interface working surface is repaiied the transition slope; Polishing: working surface is carried out polishing treatment with the abrasive belt buffing machine;

Rolling element and retainer carrier bar are generally blank forging (bar) with the method processing of routine, spheroidizing annealing, and blanking, rough turn, drill centers and erection opening, Bainitic hardening, finish turning; The oxygen-acetylene cutting of retainer carrier bar steel plate, milling profile, boring.

Bearing inner race, outer ring surround a full circle by 12 blocks of arc of circle plates respectively, connect by fillister head screw to be separately fixed on boat deck and the loop wheel machine axis, realize that by the rolling element between inner ring, the outer ring loop wheel machine rotates and the transmission of radial load.Interior cover rib is done PURE ROLLING at circumferencial direction guiding rolling element in raceway, an axle chain plate structure realizes that a rolling element evenly distributes at circumferencial direction.Stay the gap that 0.7mm is arranged approximately between per two blocks of arc plates, interface line is with 20 ° of bearing center line angles between the two arc plates, can guarantee that rolling element steadily rolls across interface and do not produce vibrations, impact and noise, because interface band angle, big little and gap of arc plate, all very favourable to the maintenance of installing and debugging reaches in use.The roller rolling surface adopts full convexity, can eliminate effectively or reduce to install and make the end stress that the axis deviation that produces causes and concentrate.

Claims (4)

1. asymmetric multi-subdivision bearing, comprise inner ring, outer ring, rolling element, rolling element is arranged on the retainer between inner ring, the outer ring, it is characterized in that, the asymmetric subdivision structure that described inner ring, outer ring connect and compose for the multistage arc plate, the inner ring that some arc plates are spliced, outer ring are formed the closed circle raceway respectively, are provided with retainer between the raceway, even or non-homogeneous being arranged on the retainer of roller, rolling element drives retainer and rotates.

2. asymmetric multi-subdivision bearing according to claim 1 is characterized in that, adopts obtuse angle diagonal built Placement between described two adjacent arc plates.

3. asymmetric multi-subdivision bearing according to claim 1 is characterized in that, described retainer adopts the flexible chain plank frame.

4. the preparation process of the described asymmetric multi-subdivision bearing of claim 1 is characterized in that, the manufacturing process steps of described inner ring, outer ring, rib is as follows:

1) forges, anneals, wear-resisting metallic material is forged into blank, 650 ± 20 ℃ of annealing temperatures, holding time 10～12 hours, 300 ± 20 ℃ of tapping temperatures;

2) machining, roll Qu Jiagong, stabilization, blank is machined to requires size, roll the circular arc plate that Qu Jiagong obtains having requirement curvature, 200 ± 10 ℃ of stabilization temperature, time 6～8h;

3) modified, shaping is inserted shaping mould with the circular arc plate and is carried out die quenching, is heated to 860 ± 20 ℃ of temperature, carry out shaping after the quenching immediately and handle, amount of deformation is detected and repairs, adopt high-temperature tempering then, 560 ± 10 ℃ of temperature, 8～10 hours time, hardness 260～300HB;

4) preliminary working makes workpiece reach the size and dimension of designing requirement through machining;

5) working surface induction hardening, depth of hardening 15～20mm, direct current (d.c.) 500A, tank circuit voltage 500V carries out shaping immediately and handles after the quenching, low-temperature tempering, 170 ± 10 ℃ of temperature, 8～10 hours time, working surface reaches hardness 58～60HRC;

6) finishing is worked into finished size with boundary dimension, bores mounting hole, repaiies chamfering, the raceway polishing.

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