CN102865304A - Ball type rotary support of composite raceway and machining method of ball type rotary support - Google Patents
Ball type rotary support of composite raceway and machining method of ball type rotary support Download PDFInfo
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- CN102865304A CN102865304A CN2012103249695A CN201210324969A CN102865304A CN 102865304 A CN102865304 A CN 102865304A CN 2012103249695 A CN2012103249695 A CN 2012103249695A CN 201210324969 A CN201210324969 A CN 201210324969A CN 102865304 A CN102865304 A CN 102865304A
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Abstract
The invention discloses a ball type rotary support of a composite raceway and a machining method of the ball type rotary support. The ball type rotary support of the composite raceway is characterized in that the upper curve and lower curve of the composite raceway are composed of a section of noncircular smooth curve and a section of circular arc curve which are in smooth connection, and the raceway is vertically symmetric; a starting point (X1, Y1) of the noncircular smooth curve, an arbitrary point (X0, Y0) of the noncircular smooth curve and a connection point (X2, Y2) of the noncircular smooth curve and the circular arc curve are calculated by utilizing a noncircular smooth curve function relational expression according to the concrete structural parameters of the composite raceway, and the raceway is machined by utilizing a numerically controlled lathe; and a common ball type raceway is changed into the composite raceway, so that the normal working time of the worn rotary support can be prolonged, and the bearing capacity of the raceway can be improved, thus the working performance of the rotary support is improved, and the service life of the rotary support is prolonged.
Description
Technical field
The invention belongs to the structural design of pivoting support, be specifically related to a kind of ball-type slewing bearing and processing method thereof of compound raceway.
Technical background
The raceway pattern of now general single-row ball type slewing bearing and double eight point contact ball slewings supporting is the two centers of circle (also claiming the peach-shaped raceway) of two circular arcs, R/r〉1, raceway symmetrical (seeing accompanying drawing 1) up and down, the Internal and external cycle raceway is symmetrical.Existing pivoting support can run well after the installation in order to guarantee, certain play must be arranged, and this play can cause the actual contact angle greater than the Theoretical Design wrapping angle, and this is favourable to the state that only bears axial force, but for bear tilting moment, radial force is disadvantageous.Raceway quenching hardness, depth of hardening zone, raceway radius of curvature and wrapping angle are to affect the bearing capacity of peach-shaped raceway pivoting support and four important parameters in working life.The raceway quenching hardness is subjected to the restriction of steel ball surface hardness can only be 55 ~ 62HRC, and is limited from the effect of this respect raising bearing capacity; As long as depth of hardening zone is deepened depth of hardening zone except meeting improves the quenching cost greater than specified value, can not aspect the raising bearing capacity large effect arranged; The design wrapping angle is crossed the possibility that conference increases raceway limit mouth conquassation in existing raceway pattern, also should not improve by the method that increases wrapping angle the bearing capacity of pivoting support; Only has the bearing capacity that improves pivoting support by the method that changes the raceway shape.
Summary of the invention
The purpose of this invention is to provide a kind of ball-type slewing bearing and processing method thereof that improves the compound raceway of raceway bearing capacity.The ball-type slewing bearing of this compound raceway can significantly improve service behaviour and the life-span of pivoting support.
The object of the present invention is achieved like this: the ball-type slewing bearing of described compound raceway changes compound raceway into by the peach-shaped raceway of ball-type slewing bearing, the upper lower curve of described compound raceway is made of jointly one section non-circle smooth curve and one section circular curve, two sections line smoothings connect, and raceway is symmetrical up and down.The starting point (X1, Y1) of non-circle smooth curve, the arbitrfary point (X0, Y0) of non-circle smooth curve, non-circle smooth curve and circular curve tie point (X2, Y2) are calculated by following functional relation respectively:
In the following formula: r is the steel ball radius of curvature; R is Theoretical Design point of contact radius of curvature; T=R/r is the ratio of Theoretical Design point of contact radius of curvature and steel ball radius of curvature; α is the design wrapping angle of steel ball and raceway; β is the theoretical wrapping angle of non-circular curve and steel ball; β 1 is the theoretical wrapping angle of non-circular curve starting point and steel ball; β 2 is the theoretical wrapping angle of non-circular curve and circular curve tie point and steel ball; O is raceway central point (being the steel ball center).The span of ratio of curvature t is: 1.01 ~ 1.06, and wrapping angle α span is: 40o ~ 60o, wrapping angle β span is: 15o ~ 60o.
The processing method of the ball-type slewing bearing of the compound raceway of the present invention is:
1, according to the concrete structure parameter of compound raceway, calculate the starting point (X1 of non-circle smooth curve with above-mentioned functional relation, Y1), the arbitrfary point (X0 of non-circle smooth curve, Y0), non-circle smooth curve and circular curve tie point (X2, Y2), adopt numerically controlled lathe that raceway is carried out semi finishing;
2, mid-frequency induction hardening is carried out in the shadow region in the raceway schematic diagram;
3, use the numerical control roller path special purpose lathe compound raceway is carried out hard car.
Studies show that, make general through ball type raceway into compound raceway, can improve the contact stress state of steel ball and raceway, both keep original common peach-shaped raceway and born the advantage of axial force, greatly improve under gapped state, the ability of bearing radial force, tilting moment prolongs the time of the rear pivoting support normal operation of wearing and tearing, improve the raceway bearing capacity, and then improve service behaviour and the life-span of pivoting support.After adopting compound raceway, in the situation that circular arc radius of curvature, depth of hardening zone are identical, the bearing capacity of pivoting support can improve more than 30%.
Description of drawings
Fig. 1 is the shape schematic diagram of existing ball-type slewing bearing raceway.
Fig. 2 is the shape schematic diagram of the compound raceway of the present invention.
Fig. 3 is the single-row ball type slewing bearing schematic diagram of the compound raceway of the present invention.
Embodiment
The shape schematic diagram of the compound raceway of the present invention is referring to Fig. 2.The ball-type slewing bearing of described compound raceway changes compound raceway into by the peach-shaped raceway of ball-type slewing bearing, and the upper lower curve of compound raceway is made of jointly one section non-circle smooth curve and one section circular curve, and two sections line smoothings connect, and raceway is symmetrical up and down.
Among the figure: r is the steel ball radius of curvature; R is Theoretical Design point of contact radius of curvature; T=R/r is the ratio of Theoretical Design point of contact radius of curvature and steel ball radius of curvature; R1 is the circular arc radius of curvature; O1 is the upper circular arc center of circle; O2 is the lower circular arc center of circle; E be up and down the circular arc center of circle with respect to the offset at raceway center; R2 is raceway bottom circular arc radius of curvature; α is the design wrapping angle of steel ball and raceway; β is the theoretical wrapping angle of non-circular curve and steel ball; β 1 is the theoretical wrapping angle 1 of non-circular curve starting point and steel ball; β 2 is the theoretical wrapping angle of non-circular curve and circular curve tie point and steel ball; O is raceway central point (being the steel ball center);
X0 is that any point can be by obtaining with r, R/r, function calculation that α, β are relevant with respect to the X value of raceway central point on the non-circle smooth curve;
X1---non-circle smooth curve starting point is with respect to the X value of raceway central point, can be obtained by the function calculation relevant with r, R/r, α, β 1;
The concrete structure parameter of compound raceway is as follows:
The span of ratio of curvature t is: 1.01 ~ 1.06, and wrapping angle α span is: 40o ~ 60o, wrapping angle β span is: 15o ~ 60o.
The processing method of the ball-type slewing bearing of the compound raceway of the present invention is:
1, according to the concrete structure parameter of compound raceway, calculate the starting point (X1 of non-circle smooth curve with above-mentioned functional relation, Y1), the arbitrfary point (X0 of non-circle smooth curve, Y0), non-circle smooth curve and circular curve tie point (X2, Y2), adopt numerically controlled lathe that raceway is carried out semi finishing;
2, mid-frequency induction hardening is carried out in the shadow region in the raceway schematic diagram; Quenching hardness is 57 ~ 62HRC, and depth of hardening zone is not less than 0.1 times of steel ball size.
3, use the numerical control roller path special purpose lathe compound raceway is carried out hard car.
As can be seen from Figure 3, the raceway pattern of single-row ball type slewing bearing is designed to compound raceway.When the raceway parameter value of ball-type slewing bearing is: steel ball radius of curvature r=15.875mm, the raceway radius of curvature of Theoretical Design point of contact and the ratio t=1.03 of steel ball radius of curvature, be radius of curvature R=16.35125 mm and wrapping angle α=45o, the radius of curvature r1=16.7262 mm of circular curve, e=0.60189, r2=4mm, the theoretical wrapping angle β 1=25o of non-circular curve starting point and steel ball, X1, Y1 (14.4381,6.64527), the theoretical wrapping angle β 2=60o of non-circular curve end point and steel ball, X2, Y2 (7.7982,13.85241), the formula of any point on the non-circular curve is as follows:
X0=-17.11565·ctgβ·(1+1.06185567*?ctg
2β)
-1/2+0.6943
Y0=16.11862·(1+1.06185567·ctg
2β)
?-1/2
The span of β: 25o～60o
According to above size, at first be to use numerically controlled lathe to carry out the semi finishing of the compound raceway of this kind.The curve surface of raceway regular shape of numerical control turning, surface roughness is low, raceway limit mouth circular arc chamfering radius is consistent, and with the roller surface smooth connection.The curve surface of raceway of rule makes depth of hardening zone evenly become possibility, and " sharp angle effect " the when chamfering of smooth connection has been avoided quenching eradicated the defective of raceway limit mouth easy hardening crack.The compound curve surface of raceway of numerical control turning, slightly poorer except surface roughness, the curve surface of raceway after all the other sizes and the fine finishing is in full accord, so the allowance for finish of raceway is very little.
Then use the method for Frequency Induction Heating the surface heat processing is carried out in the working zone of raceway, quenching hardness is 57 ~ 62HRC, and depth of hardening zone is greater than 3.2mm.
At last the compound raceway after the tempering is carried out with car for mill processing.Adopt numerically controlled lathe, pottery or cubic boron nitride cutting tool to carry out the hard car of raceway, can guarantee that raceway shape, surface roughness that turning goes out meet designing requirement, can form cold hardened layer in raceway face again and play and improve the pivoting support effect in working life.Only mid-frequency induction hardening is carried out in the working zone of raceway, can reduce the size of inductor, the energy that consumes when saving heat treatment.
Claims (4)
1. the ball-type slewing bearing of a compound raceway, the ball-type slewing bearing of described compound raceway changes compound raceway into by the peach-shaped raceway of ball-type slewing bearing, the upper lower curve that it is characterized in that compound raceway is made of jointly one section non-circle smooth curve and one section circular curve, two sections line smoothings connect, and raceway is symmetrical up and down; The starting point (X1, Y1) of non-circle smooth curve, the arbitrfary point (X0, Y0) of non-circle smooth curve, non-circle smooth curve and circular curve tie point (X2, Y2) are calculated by following functional relation respectively:
In the following formula: r is the steel ball radius of curvature, R is Theoretical Design point of contact radius of curvature, t=R/r is the ratio of Theoretical Design point of contact radius of curvature and steel ball radius of curvature, α is the design wrapping angle of steel ball and raceway, β is the theoretical wrapping angle of non-circular curve and steel ball, β 1 is the theoretical wrapping angle of non-circular curve starting point and steel ball, and β 2 is the theoretical wrapping angle of non-circular curve and circular curve tie point and steel ball, and O is raceway central point (being the steel ball center);
The span of t is: 1.01 ~ 1.06, α span is: 40o ~ 60o, the β span is: 15o ~ 60o.
2. the processing method of the ball-type slewing bearing of compound raceway according to claim 1, its process step is:
(1), according to the concrete structure parameter of compound raceway, calculate the starting point (X1 of non-circle smooth curve with above-mentioned functional relation, Y1), the arbitrfary point (X0 of non-circle smooth curve, Y0), non-circle smooth curve and circular curve tie point (X2, Y2), adopt numerically controlled lathe that raceway is carried out semi finishing;
(2), mid-frequency induction hardening is carried out in the shadow region in the raceway schematic diagram;
(3) use the numerical control roller path special purpose lathe compound raceway is carried out hard car.
3. the ball-type slewing bearing processing method of compound raceway according to claim 2 is characterized in that quenching hardness is 57 ~ 62HRC.
4. the ball-type slewing bearing of compound raceway according to claim 1 and 2 is characterized in that depth of hardening zone is not less than 0.1 times of steel ball size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210324969.5A CN102865304B (en) | 2012-09-05 | 2012-09-05 | Ball type rotary support of composite raceway and machining method of ball type rotary support |
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| CN201210324969.5A CN102865304B (en) | 2012-09-05 | 2012-09-05 | Ball type rotary support of composite raceway and machining method of ball type rotary support |
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| CN102865304B CN102865304B (en) | 2014-10-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111347178A (en) * | 2020-05-13 | 2020-06-30 | 常州奥旋重型轴承有限公司 | Integral bearing with bottom plate for laser cutting equipment |
| CN113275603A (en) * | 2021-06-18 | 2021-08-20 | 马鞍山方圆精密机械有限公司 | Machining method of wind power slewing bearing raceway |
| CN113798784A (en) * | 2020-06-17 | 2021-12-17 | 武汉软件工程职业学院 | Manufacturing method of machining part and machining part |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5174597A (en) * | 1990-03-10 | 1992-12-29 | Man Nutzfahrzeuge A.G. | Damping arrangement for the joint of an articulated omnibus |
| CN1865725A (en) * | 2006-03-30 | 2006-11-22 | 马鞍山统力回转支承有限公司 | Single-row ball type slewing bearing of elliptic roller track and method for making same |
| CN101555907A (en) * | 2009-05-22 | 2009-10-14 | 马鞍山精一工程机械有限公司 | Ball-type slewing bearing with asymmetric raceway and processing method thereof |
| DE202011051680U1 (en) * | 2011-10-19 | 2011-11-08 | Heinz-Jürgen Eggemann | slewing bearings |
| CN202971588U (en) * | 2012-09-05 | 2013-06-05 | 马鞍山统力回转支承有限公司 | Ball type slewing bearing of composite roller path |
-
2012
- 2012-09-05 CN CN201210324969.5A patent/CN102865304B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5174597A (en) * | 1990-03-10 | 1992-12-29 | Man Nutzfahrzeuge A.G. | Damping arrangement for the joint of an articulated omnibus |
| CN1865725A (en) * | 2006-03-30 | 2006-11-22 | 马鞍山统力回转支承有限公司 | Single-row ball type slewing bearing of elliptic roller track and method for making same |
| CN101555907A (en) * | 2009-05-22 | 2009-10-14 | 马鞍山精一工程机械有限公司 | Ball-type slewing bearing with asymmetric raceway and processing method thereof |
| DE202011051680U1 (en) * | 2011-10-19 | 2011-11-08 | Heinz-Jürgen Eggemann | slewing bearings |
| CN202971588U (en) * | 2012-09-05 | 2013-06-05 | 马鞍山统力回转支承有限公司 | Ball type slewing bearing of composite roller path |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111347178A (en) * | 2020-05-13 | 2020-06-30 | 常州奥旋重型轴承有限公司 | Integral bearing with bottom plate for laser cutting equipment |
| CN113798784A (en) * | 2020-06-17 | 2021-12-17 | 武汉软件工程职业学院 | Manufacturing method of machining part and machining part |
| CN113275603A (en) * | 2021-06-18 | 2021-08-20 | 马鞍山方圆精密机械有限公司 | Machining method of wind power slewing bearing raceway |
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| CN102865304B (en) | 2014-10-22 |
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