CN100380007C - Manufacturing method of group-assorted bulge quantity of angular contacted ball bearing - Google Patents

Abstract

The present invention provides a method for processing the protrusion quantity of assembled angular contact ball bearings. Protrusion quantity of a batch of single bearing parts, which needs to be repaired before assembly, is calculated, and part of the parts are repaired tentatively on a plane machine tool before assembly according to calculated values. The parts repaired tentatively are assembled, the projection quantity is measured, and repairing and grinding data are regulated according to the distributing condition of the projection quantity of the parts repaired tentatively. All rest parts are repaired and ground on the plane machine tool. By improving the method for processing the protrusion quantity of assembled angular contact ball bearings, the present invention effectively increases the pairing rate of one time projection quantity of a single batch of products, the pairing rate is increased to more than 96%, and the pairing efficiency is increased by more than two times. Simultaneously, waste products generated in single machine repair and a plurality of problems of cleaning, low accuracy, shortening of service lives of bears, low reliability of repeated measurement, etc. caused by the single machine repair are reduced, and requirements of users are satisfied. The present invention not only can be used for duplex arrangement angular contact ball bearings, but also can provide reference value for multiple arrangement angular contact ball bearings assembled in a directional mode, such as triple arrangement, quaternate arrangement, etc.

Description

The processing method of assembly angular contact ball bearing protrusion amount

Affiliated technical field

The invention belongs to the processing technique field of bearing, what relate generally to is a kind of processing method of assembly angular contact ball bearing protrusion amount.

Background technique

Angular contact ball bearing can bear radial and axial joint load simultaneously, also can bear pure axial load simultaneously, and can work under higher rotation speed.So, require occasions such as highi degree of accuracy, high rotating speed that purposes is widely arranged at machine tool chief axis, electric main shaft etc.Use for bearing capacity, rigidity and running accuracy, the angular contact ball bearing that improves bearing adopts two or more bearing assembly usually, and bearing generally to apply certain preloading when work.The angular contact ball bearing collocation form of known production duplex configuration has back-to-back (DB type), face-to-face (DF type) and series connection (DT type) three kinds.As Figure 1-3: (DB type) is that symmetry is installed back-to-back, can bear radial load, the thrust load of both direction, and bigger tilting moment, the wrapping angle of two cover bearings can be different; (DF type) symmetry is installed face-to-face, the thrust load that can bear the radial load both direction, and the ability of tilting moment is relatively poor; Series connection (DT type) is that two cover bearings are identical; Homophase is arranged, and can bear radial load, the thrust load that direction is bigger, and the wrapping angle of two cover bearings must be identical.

The assembly angular contact ball bearing can carry, and to preload size be that protrusion amount by single matched bearing is determined.Single cover bearing protrusion amount is that spindle holds to preload and acts on same end, and non-datum end face of lasso is with respect to the relative position size of another reference face of ring, and during protrusion, the protrusion amount is "+" value, and the protrusion amount is "-" value when recessed.As shown in Figure 4, (the protrusion amount schematic representation of single cover angular contact ball bearing), a, b are illustrated respectively in the protrusion amount (diagram a＞0, b＜0) at load Fa effect lower bearing two ends among the figure.To the duplex matched bearing, if directed assembly is when disposing back-to-back, two bearings a ₁+ a ₂≤ 0; In the time of face-to-face, b should be arranged ₁+ b ₂〉=0; If two bearings series connection, then a ₁+ b ₂≤ 0 or a ₁+ b ₁≤ 0; (promptly two single cover bearings can be with back-to-back or any assembly of face-to-face arbitrary mode and obtain constant preloading if universal assembled mode, also arranged in series and obtain constant preloading arbitrarily, also arranged in series obtains certain preloading arbitrarily) then require two ends protrusion amount a≤0, b≤0 of single cover universal matching bearing.

At present, domestic have following three kinds to assembly angular contact ball bearing protrusion amount pairing processing method:

First method is that bearing all is assembled into finished product, carries out protrusion measuring, data logging then, carries out the repair of unit protrusion amount at last.There is the defective that manufacturing efficiency is low, finished product accuracy is low in this method, owing to be that finished product is repaiied end face, before repairing, cause the channel surface quality to descend although take between raceway groove, to be coated with the method for full grease to prevent as far as possible that bearing from relatively rotating and the emery wheel abrasive dust enters raceway groove, however, but still after having the bearing assembly, the raceway face quality deterioration is serious, and bearing running accuracy of bringing thus and degradation problem under working life.In addition, the product of fixing the protrusion amount also needs with after the cleaning of gasoline list cover, carrying out the second time measures, the method, caused waste product when both easily having caused bearing quality decline and finished product to repair end face, cause problems such as the waste of grease and gasoline etc. and the duplication of labour again, the production of the therefore incompatible angular contact ball bearing of property assembly in batches.

Second method is that half of bearing is assembled into finished product and is numbered, surveys protrusion amount, data logging, and make protrusion amount distribution map according to record data, calculate reconditioning quality and second half bearing correlated parts of reconditioning according to distribution, after being assembled into finished product and carrying out protrusion measuring, carry out assembly with the first half bearing.Though this processing method manufacturing efficiency increases than first kind, half reconditioning quality of reconditioning is big, and sometimes even exceed national Specification, and bearing assembly rate is still about 60-70%, and the bearing that group unmatches also needs the unit repair.The bearing of unit repair is identical with above-mentioned first method, exists raceway face quality deterioration, running accuracy and working life to descend equally and produces problems such as reconditioning waste product, goods and materials be wasteful.This method is applicable to the production of small lot pairing bearing.

The third processing method is that bearing all is assembled into semi-finished product, promptly measures the protrusion value before not filling rolling element, is reduced into part, as calculated after the reconditioning of the amount of protrusion, finish finished product assembling, assembly work such as protrusion measuring again.This processing method exists that manufacturing efficiency is lower, organization of production is loaded down with trivial details, only is applicable to highi degree of accuracy, the production of experimental product pairing bearing.

This shows that all there is certain narrow limitation in above-mentioned three kinds of methods, whole efficiency is generally lower, and pairing process complexity is loaded down with trivial details.

Summary of the invention

The objective of the invention is at above-mentioned technological difficulties, a kind of processing method of assembly angular contact ball bearing protrusion amount is proposed, this method has taken into full account the influence of each parameter machining error to the protrusion amount, thereby effectively improved the disposable pairing rate of assembly angular contact ball bearing, manufacturing efficiency and product precision have been improved, the rate of reducing the number of rejects and seconds and cost of production.

The present invention realizes that the technological scheme that above-mentioned purpose is taked is: calculate the protrusion amount that should repair in advance before the assembling of single by the gross cover bearing part; Increase the level size reconditioning operation of corresponding part before the assembling, and repair part in the examination of plane lathe; The part assembling is repaiied in examination, measure the protrusion amount, repair part protrusion amount distribution situation, the reconditioning incremental data is adjusted, and remained whole parts in plane lathe reconditioning according to examination.

The protrusion amount that the present invention should repair before part is assembled is calculated and is calculated according to following formula: the protrusion amount that constitutes assembly ball bearing list cover bearing is set at δ, that is:

$\mathrm{\δ}=C-\mathrm{ai}-\mathrm{ae}+1/2\√\stackrel{\‾}{4g(R_i+\mathrm{Re}-\mathrm{Dw}-g^2)}+{\mathrm{\δ}}_1$

In the formula: C is the outer ring width, and ai is an inner ring ditch position dimension, and ae is the outer ring groove position size, and g is a bearing end-play, R _iBe the bear inner ring grooved railway radius of curvature, Re is the outer ring raceway radius of curvature, and Dw is a steel ball size, δ ₁For applying, bearing produces axial predeformation amount after the preload.

Bearing parameter C, ai, ae, g, R as can be seen from the above equation _i, Re, Dw machining error all make and protrude changing of volume production, respectively each parameter is asked local derviation, with the influence degree of definite each parameter to the protrusion amount.

$=0.274$

$=0.592$

$=-0.592$

Δδ＝ΔC-Δai-Δae+0.274Δg+0.592ΔR _i+0.592ΔRe-0.592ΔDw

Therefore, from following formula as can be known, the machining error of ring width and inside and outside circle ditch position has the greatest impact to the protrusion amount, and influence coefficient is 100%, and inside and outside circle raceway groove radius and steel ball size take second place, be 59.29%, and radially the error of supporting play is 27.4% to the influence coefficient minimum of protrusion amount, and the machining error of ai, ae, Dw subtracts direction to the influence of protrusion amount, promptly ai, ae, when Dw is processed into overgauge, then bearing protrusion amount reduces, and C, g, R _i, Re machining error the influence of protrusion amount is added direction, i.e. C, g, R _i, when Re is processed into overgauge, then bearing protrusion amount increases.

The machining tolerance of ai, ae is 100% to the influence coefficient of protrusion amount, but aborning can not be quantitative measure because the machining tolerance of ai, ae can only be controlled with model qualitatively, or quantitative the measuring of energy, but existing process equipment is limited in one's ability, owing to the transmission error of in-process measurement sum of errors standard piece, model, uncertain variation can take place in survey data simultaneously, so the control of the machining tolerance of ai, ae is difficult, and do not reach more effective result, therefore difficult control.

The machining tolerance of Ri, Re has certain influence to the protrusion amount, aborning can only be qualitatively to its control and can not be quantitative measure, because its size should not arbitrarily be changed in cost aspects such as the processing of process equipment ability and reference gauge and management, therefore should not control simultaneously.

Bearing end-play and steel ball tolerance all realize by matching, and the convenience in order to guarantee that wrapping angle that bearing has and user use bearing can not change it, therefore should not adjust.

The machining deviation of bearing width is 100% to the influence coefficient of protrusion amount, and work in-process is easy to reconditioning and quantitatively control.

From above analysis situation, the machining deviation of bearing width B or C is not only controlled but also give birth to considerable influence to protruding volume production easily, carries out emphasis control so tackle it, and single protrusion amount overall distribution of overlapping bearing is tending towards on the rational position.

The present invention passes through the improvement to the processing method of assembly angular contact ball bearing protrusion amount, improve the product list effectively and criticized disposable protrusion amount pairing rate, disposable pairing rate is brought up to more than 96%, matching efficiency has improved more than 2 times, also reduced simultaneously the waste product that produces owing to the unit repair, and many problems of bringing thus such as reliability as cleaning, precision, bearing life decline and duplicate measurements, satisfied user's requirement.The present invention not only can be applied to duplex configuration angular contact ball bearing, to directed assembly three, multi-joint configuration angular contact ball bearing such as tetrad also has reference value.

Description of drawings

Accompanying drawing 1-3 is the angular contact ball bearing collocation form schematic representation of existing duplex configuration.

Accompanying drawing 4 is protrusion amount schematic representation of the present invention.

Among the figure, C, being the outer ring width, ai, is inner ring ditch position dimension, ae, is the outer ring groove position size, g, is bearing end-play, R _i, be the bear inner ring grooved railway radius of curvature, Re, be the outer ring raceway radius of curvature, Dw, be steel ball size, δ ₁, produce axial predeformation amount after the preload for bearing applies.

Embodiment

Embodiment 1:

Present embodiment is paired back to back angle contact ball bearing configuration installation form, and with (7004AC/DB is an example), its protrusion amount pairing step is as follows:

1, calculate in the non-datum end face of cover to the protrusion amount δ of overcoat datum end face according to formula $\mathrm{\δ}={\mathrm{\δ}}_0+{\mathrm{\δ}}_1$

$=C-\mathrm{ai}-\mathrm{ae}+1/2\√\stackrel{\‾}{4g(R_i+\mathrm{Re}+\mathrm{Dw})-g^2}+{\mathrm{\δ}}_1$

The parameter substitution following formula of 7004AC is had

$\mathrm{\δ}=12-6-6.05+1/2\√\stackrel{\‾}{4\×0.075(2.98+2.98-5.5562){0.075}^2}+{\mathrm{\δ}}_1$

$=0.12+{\mathrm{\δ}}_1$ Again ${\mathrm{\δ}}_1=4.36\×{10}^{-43}\√\stackrel{\‾}{{\mathrm{Fa}}^2/(Z^2\×{\mathrm{Sin}}^2\mathrm{\α}\×\mathrm{Dw})}/\mathrm{Sin\α}$

$=0.005$

∴ protrusion amount δ=0.12+0.005

＝0.125

2, examination is repaiied 200, and (the non-datum end face of cover in repairing) size is by 12 ^-0.12 _-0.13Processing, check.

3, examination is repaiied part lasso trap, the protrusion amount is surveyed in assembling, and record protrudes numerical quantity simultaneously.

4, analyze examination and repair back product protrusion amount distribution situation, this batch protrusion amount has 40% deflection " subtracting " direction, does an adjustment so residue is waited to repair part reconditioning size, and size is by 12 ^-0.11 _-0.12Control.

5, bearing assembling, the pairing of protrusion amount.

Annotate: this batch protrusion amount is paired into power and reaches 98%.

Embodiment 2:

Present embodiment is in pairs face-to-face angular contact ball bearing configuration installation form, and with (7004AC/DF is an example), its protrusion amount pairing step is as follows:

1, calculates the protrusion amount δ that the non-datum end face of overcoat internally overlaps datum end face

Because single cover 7004AC bearing and example 1 are just the same, be the matching form difference, its protrusion amount is calculated with embodiment 1 (calculating slightly).

2, examination is repaiied 100, and (repairing the non-datum end face of overcoat) size is by 12 ^-0.11 _-0.12Reconditioning, check.

3, examination is repaiied part lasso trap, assembling, survey the protrusion amount, record protrudes numerical quantity simultaneously.

4, analyze examination and repair back product protrusion numerical quantity and distribution situation, this batch has 20% protrusion amount deflection " adding " direction, is 11.89 ± 0.005 so remainder is waited to repair overcoat reconditioning size adjusting.

5, bearing assembling, the pairing of protrusion amount.

Annotate: this batch protrusion amount is paired into power and reaches 99%.

Embodiment 3:

Present embodiment is that the series connection angular contact ball bearing disposes installation form in pairs, and with (7004AC/DT is an example), its protrusion amount pairing step is as follows:

1, this model and embodiment 1,2 are just the same, are the matching form difference, and its protrusion amount is calculated slightly (with embodiment 1 calculating)

2, according to its distinctive matching form, we wish that its protrusion amount δ closely may reach " omnipotent pairing " effect near zero.Therefore examination is repaiied 800, and wherein inner and outer ring is each 400, all repaiies non-datum end face, and size is by 12 ^-0.09 _-0.10Control.

3, examination is repaiied part lasso trap, assembling, survey the protrusion amount, record protrudes numerical quantity simultaneously.

4, analyze examination and repair back product protrusion numerical quantity and distribution situation, this batch protrusion amount all near zero, meets perfect condition.So remaining still presses 12 ^-0.09 _-0.10Processing.

5, bearing assembling, the pairing of protrusion amount.

Annotate: this batch protrusion amount is paired into power and reaches 99.5%.

Claims (1)

1. the processing method of an assembly angular contact ball bearing protrusion amount is characterized in that: calculate the protrusion amount that should repair in advance before the assembling of single by the gross cover bearing part; Repair part according to calculated value in the examination of plane lathe before the assembling; The part assembling is repaiied in examination, measure the protrusion amount, repair part protrusion amount distribution situation, the reconditioning data are adjusted, and remained whole parts in plane lathe reconditioning according to examination.

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