WO2013158008A1 - Method for manufacturing bearing housing by extrusion - Google Patents

Method for manufacturing bearing housing by extrusion Download PDF

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Publication number
WO2013158008A1
WO2013158008A1 PCT/SE2013/000046 SE2013000046W WO2013158008A1 WO 2013158008 A1 WO2013158008 A1 WO 2013158008A1 SE 2013000046 W SE2013000046 W SE 2013000046W WO 2013158008 A1 WO2013158008 A1 WO 2013158008A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing housing
bearing
metal
male component
component
Prior art date
Application number
PCT/SE2013/000046
Other languages
French (fr)
Inventor
Patric NIVA
Mikael Jansson
Original Assignee
Aktiebolaget Skf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aktiebolaget Skf filed Critical Aktiebolaget Skf
Publication of WO2013158008A1 publication Critical patent/WO2013158008A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/14—Making other products
    • B21C23/142—Making profiles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/042—Housings for rolling element bearings for rotary movement
    • F16C35/047—Housings for rolling element bearings for rotary movement with a base plate substantially parallel to the axis of rotation, e.g. horizontally mounted pillow blocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C43/00—Assembling bearings
    • F16C43/02—Assembling sliding-contact bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2204/00—Metallic materials; Alloys
    • F16C2204/20—Alloys based on aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/40—Shaping by deformation without removing material
    • F16C2220/48—Shaping by deformation without removing material by extrusion, e.g. of metallic profiles

Definitions

  • the present invention concerns a method for manufacturing a bearing housing, and a bearing housing manufactured using such a method.
  • a bearing housing helps in getting the maximum out of a bearing while reducing the effort required in mounting and dismounting a bearing on a shaft.
  • Bearing housings are usually arranged to lubricate and protect a bearing housed therein, which may increase the bearing lifetime. Moisture, dirt and other debris is namely prevented from reaching the bearings and lubricant is hindered from dripping out of or evaporating from the bearing.
  • at least part of a monitoring system, a lubricant injection system, or mounting and/or dismounting accessories can be incorporated into the bearing housing.
  • Bearing housings for use in conveyor equipment, drums, tube mills, converters, fans and large electrical machines are usually made from cast iron using a casting method in which metal is melted and poured into a casting mould. The metal cools in the mould and is then taken out of the mould by opening the mould.
  • Conventional cast iron plummer block roller bearing housings may have a high load capacity. Such cast iron bearing housings having a high loading capacity are expensive to manufacture, and many applications in which bearing housings are used do not require a bearing unit to have such a high load capacity.
  • An object of the invention is to provide an improved method for manufacturing a bearing housing.
  • This object is achieved by extruding at least part of the bearing housing, i.e. by manufacturing at least part of the bearing housing, i.e. the main body of the bearing housing, using an extrusion method in which a material, such as a metal, metal alloy, polymer or ceramic, is pushed or drawn through a die of the desired cross-section.
  • a material such as a metal, metal alloy, polymer or ceramic
  • the cost of manufacturing such an extruded bearing housing may namely be more than 30% less than the cost of manufacturing a cast bearing housing having the same load capacity.
  • the method comprises the step of extruding the bearing housing from a metal or metal alloy, for example a lightweight metal or metal alloy, i.e. a metal or metal alloy having an atomic weight that is less than the atomic weight of nickel, such as aluminium or an aluminium alloy.
  • a metal or metal alloy for example a lightweight metal or metal alloy, i.e. a metal or metal alloy having an atomic weight that is less than the atomic weight of nickel, such as aluminium or an aluminium alloy.
  • the method comprises the step of providing the underside of the bearing housing with at least one female component, such as a cavity, to enable it to be mounted by inserting at least one male component, such as a bolt or a screw, therein.
  • the at least one female component may be formed during the extrusion process.
  • the method comprises the step of providing the underside of the bearing housing with at least one male component, such as a bold or a screw, to enable it to be mounted by inserting the at least one male component into at least one female component, such as a nut.
  • the at least one male component may be formed during the extrusion process.
  • the bearing housing is arranged to support a shaft having a diameter of 20-100mm.
  • the bearing housing is arranged to withstand a dynamic load of 80-300 kN.
  • the present invention also concerns a bearing housing having a body whereby at least part of the body comprises extruded material, such as extruded metal or metal alloy, for example an extruded metal or an extruded metal alloy having an atomic weight that is less than the atomic weight of nickel, such as aluminium or the metal alloy is an aluminium alloy.
  • extruded material such as extruded metal or metal alloy
  • an extruded metal or an extruded metal alloy having an atomic weight that is less than the atomic weight of nickel, such as aluminium or the metal alloy is an aluminium alloy.
  • the bearing housing comprises at least one female component, such as a cavity, on the underside thereof to enable the bearing housing to be mounted by inserting at least one male component, such as a bolt or screw, into the at least one female component.
  • the at least one female component may be formed during the extrusion process.
  • the bearing housing comprises at least one male component, such as a bolt or screw, to enable it to be mounted by inserting the at least one male component into at least one female component, such as a nut.
  • the at least one male component may be formed during the extrusion process.
  • the bearing housing is arranged to support a shaft having a diameter of 20-100mm, and or it is arranged to withstand a dynamic load of 80-300 kN.
  • the bearing housing may be of any shape or size and may be arranged to incorporate any type of bearing, such as radial self-aligning rolling bearings i.e. self-aligning ball bearings, spherical roller bearings or CARB bearings, or a plurality of types of bearing. Any method of mounting the incorporated bearing(s) on a shaft may used such as: on adapter sleeves and smooth shafts, on adapter sleeves and stepped shafts, on withdrawal sleeves and stepped shafts and on cylindrical seats and stepped shafts.
  • any type of bearing such as radial self-aligning rolling bearings i.e. self-aligning ball bearings, spherical roller bearings or CARB bearings, or a plurality of types of bearing. Any method of mounting the incorporated bearing(s) on a shaft may used such as: on adapter sleeves and smooth shafts, on adapter sleeves and stepped shafts, on withdrawal sleeves and stepped shafts and on cylindrical seats and stepped shafts.
  • Figure 1 shows SKF's plummer block roller bearing unit SYNT 50 and a bearing housing according to an embodiment of the invention
  • Figure 2 shows a bearing housing according to an embodiment of the invention
  • Figure 3 shows a graph of shaft diameter versus dynamic load for bearing housings according to the prior art and a bearing housing according to an embodiment of the invention.
  • Figures 1 and 2 show a bearing housing 10 comprising extruded aluminium.
  • the bearing housing 10 comprises two female components 12, such as cavities, on the underside 14 thereof to enable the bearing housing 10 to be mounted from beneath by inserting at least 5 one male component 24, such as bolts or screws, into the at least one female component 12.
  • the head of the male component bolt/screw 24 is arranged to be housed within the bearing housing 10.
  • the head of the male component bolt/screw 24 may however be arranged to be housed outside the bearing housing 10.
  • the bearing housing 10 may comprise at least one male 10 component, such as a bolt or screw, on the underside thereof to enable it to be mounted from beneath by inserting the at least one male component into at least one female component, such as a nut.
  • Such a bearing housing 10 may be manufactured by hot or cold extrusion.
  • the bearing 15 housing 10 may also comprise any number of internal cavities and/or extruded features, formed during the extrusion process.
  • Figure 1 also shows SKF's cast iron plummer block roller bearing unit SYNT 50 (16) which has a basic dynamic load rating of 104 kN, which is arranged to support a shaft 20 having a diameter of 50 mm and which has a fastening dimension of 2 0 mm.
  • the extruded bearing housing 10 is lighter than a similarly sized cast iron plummer block roller bearing unit SYNT 50 (16) since it may be extruded from a lightweight metal or metal alloy, such as aluminium.
  • the extruded 25 bearing housing 10 is arranged to support a shaft 20 and a roller bearing 22 in the illustrated embodiment.
  • Figure 3 shows a graph of shaft diameter, d (in mm), versus dynamic load, C (in kN), for bearing housings according to the prior art, 16 and 18, and a bearing housing 10 30 according to an embodiment of the invention.
  • the curve 16 shows the dynamic load on SKF's cast iron plummer block roller bearing unit SYNT 50 when supporting shafts having an outer diameter of about 35mm to 100 mm.
  • the curves 18 show the dynamic load on other available cast iron bearing housings 35 18 for when supporting shafts having an outer diameter of about 15mm to 90 mm.
  • SKF's plummer block roller bearing unit SYNT 50 (curve 16) has a high load capacity.
  • the other prior art bearings 18 have a much lower load capacity.
  • the bearing housing 10 according to the present invention has a load capacity being higher than the prior art cast iron bearings 18 and may be used in applications that do not require such a high load capacity as SKF's plummer block roller bearing unit SYNT 50 (curve 16).

Abstract

Method for manufacturing a bearing housing (10) that comprises the step of extruding at least part of the bearing housing (10).

Description

Method for manufacturing bearing housing by extrusion
TECHNICAL FIELD
The present invention concerns a method for manufacturing a bearing housing, and a bearing housing manufactured using such a method.
BACKGROUND OF THE INVENTION
A bearing housing helps in getting the maximum out of a bearing while reducing the effort required in mounting and dismounting a bearing on a shaft. Bearing housings are usually arranged to lubricate and protect a bearing housed therein, which may increase the bearing lifetime. Moisture, dirt and other debris is namely prevented from reaching the bearings and lubricant is hindered from dripping out of or evaporating from the bearing. Furthermore, at least part of a monitoring system, a lubricant injection system, or mounting and/or dismounting accessories can be incorporated into the bearing housing.
Bearing housings for use in conveyor equipment, drums, tube mills, converters, fans and large electrical machines are usually made from cast iron using a casting method in which metal is melted and poured into a casting mould. The metal cools in the mould and is then taken out of the mould by opening the mould. Conventional cast iron plummer block roller bearing housings may have a high load capacity. Such cast iron bearing housings having a high loading capacity are expensive to manufacture, and many applications in which bearing housings are used do not require a bearing unit to have such a high load capacity.
SUMMARY OF THE INVENTION An object of the invention is to provide an improved method for manufacturing a bearing housing.
This object is achieved by extruding at least part of the bearing housing, i.e. by manufacturing at least part of the bearing housing, i.e. the main body of the bearing housing, using an extrusion method in which a material, such as a metal, metal alloy, polymer or ceramic, is pushed or drawn through a die of the desired cross-section. Such a method allows bearing housings having complex cross-sections and an excellent surface finish to be manufactured in a cost efficient manner. The cost of manufacturing such an extruded bearing housing may namely be more than 30% less than the cost of manufacturing a cast bearing housing having the same load capacity.
According to an embodiment of the invention the method comprises the step of extruding the bearing housing from a metal or metal alloy, for example a lightweight metal or metal alloy, i.e. a metal or metal alloy having an atomic weight that is less than the atomic weight of nickel, such as aluminium or an aluminium alloy.
According to another embodiment of the invention the method comprises the step of providing the underside of the bearing housing with at least one female component, such as a cavity, to enable it to be mounted by inserting at least one male component, such as a bolt or a screw, therein. The at least one female component may be formed during the extrusion process. Alternatively, or additionally the method comprises the step of providing the underside of the bearing housing with at least one male component, such as a bold or a screw, to enable it to be mounted by inserting the at least one male component into at least one female component, such as a nut. The at least one male component may be formed during the extrusion process.
According to a further embodiment of the invention the bearing housing is arranged to support a shaft having a diameter of 20-100mm.
According to an embodiment of the invention the bearing housing is arranged to withstand a dynamic load of 80-300 kN.
The present invention also concerns a bearing housing having a body whereby at least part of the body comprises extruded material, such as extruded metal or metal alloy, for example an extruded metal or an extruded metal alloy having an atomic weight that is less than the atomic weight of nickel, such as aluminium or the metal alloy is an aluminium alloy.
According to an embodiment of the invention the bearing housing comprises at least one female component, such as a cavity, on the underside thereof to enable the bearing housing to be mounted by inserting at least one male component, such as a bolt or screw, into the at least one female component. The at least one female component may be formed during the extrusion process. Alternatively, or additionally the bearing housing comprises at least one male component, such as a bolt or screw, to enable it to be mounted by inserting the at least one male component into at least one female component, such as a nut. The at least one male component may be formed during the extrusion process.
According to another embodiment of the invention the bearing housing is arranged to support a shaft having a diameter of 20-100mm, and or it is arranged to withstand a dynamic load of 80-300 kN.
The bearing housing may be of any shape or size and may be arranged to incorporate any type of bearing, such as radial self-aligning rolling bearings i.e. self-aligning ball bearings, spherical roller bearings or CARB bearings, or a plurality of types of bearing. Any method of mounting the incorporated bearing(s) on a shaft may used such as: on adapter sleeves and smooth shafts, on adapter sleeves and stepped shafts, on withdrawal sleeves and stepped shafts and on cylindrical seats and stepped shafts.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will hereinafter be further explained by means of non-limiting examples with reference to the appended schematic figures where;
Figure 1 shows SKF's plummer block roller bearing unit SYNT 50 and a bearing housing according to an embodiment of the invention, Figure 2 shows a bearing housing according to an embodiment of the invention, and
Figure 3 shows a graph of shaft diameter versus dynamic load for bearing housings according to the prior art and a bearing housing according to an embodiment of the invention.
It should be noted that the drawings have not necessarily been drawn to scale and that the dimensions of certain features may have been exaggerated for the sake of clarity. DETAILED DESCRIPTION OF EMBODIMENTS
Figures 1 and 2 show a bearing housing 10 comprising extruded aluminium. The bearing housing 10 comprises two female components 12, such as cavities, on the underside 14 thereof to enable the bearing housing 10 to be mounted from beneath by inserting at least 5 one male component 24, such as bolts or screws, into the at least one female component 12. In the illustrated embodiment the head of the male component bolt/screw 24 is arranged to be housed within the bearing housing 10. The head of the male component bolt/screw 24 may however be arranged to be housed outside the bearing housing 10. Alternatively or additionally the bearing housing 10 may comprise at least one male 10 component, such as a bolt or screw, on the underside thereof to enable it to be mounted from beneath by inserting the at least one male component into at least one female component, such as a nut.
Such a bearing housing 10 may be manufactured by hot or cold extrusion. The bearing 15 housing 10 may also comprise any number of internal cavities and/or extruded features, formed during the extrusion process.
Figure 1 also shows SKF's cast iron plummer block roller bearing unit SYNT 50 (16) which has a basic dynamic load rating of 104 kN, which is arranged to support a shaft 20 having a diameter of 50 mm and which has a fastening dimension of 2 0 mm.
The extruded bearing housing 10 according to an embodiment of the invention is lighter than a similarly sized cast iron plummer block roller bearing unit SYNT 50 (16) since it may be extruded from a lightweight metal or metal alloy, such as aluminium. The extruded 25 bearing housing 10 is arranged to support a shaft 20 and a roller bearing 22 in the illustrated embodiment.
Figure 3 shows a graph of shaft diameter, d (in mm), versus dynamic load, C (in kN), for bearing housings according to the prior art, 16 and 18, and a bearing housing 10 30 according to an embodiment of the invention.
The curve 16 shows the dynamic load on SKF's cast iron plummer block roller bearing unit SYNT 50 when supporting shafts having an outer diameter of about 35mm to 100 mm. The curves 18 show the dynamic load on other available cast iron bearing housings 35 18 for when supporting shafts having an outer diameter of about 15mm to 90 mm. As can be seen SKF's plummer block roller bearing unit SYNT 50 (curve 16) has a high load capacity. The other prior art bearings 18 have a much lower load capacity. The bearing housing 10 according to the present invention has a load capacity being higher than the prior art cast iron bearings 18 and may be used in applications that do not require such a high load capacity as SKF's plummer block roller bearing unit SYNT 50 (curve 16).
Further modifications of the invention within the scope of the claims would be apparent to a skilled person.

Claims

1. Method for manufacturing a bearing housing (10), characterized in that it comprises the step of extruding at least part of the bearing housing (10).
2. Method according to claim 1 , characterized in that it comprises the step of extruding the bearing housing (10) from a metal or metal alloy.
3. Method according to claim 2, characterized in that said metal or metal alloy has an atomic weight that is less than the atomic weight of nickel.
4. Method according to claim 2 or 3, characterized in that said metal is aluminium or said metal alloy is an aluminium alloy.
5. Method according to any of the preceding claims, characterized in that it comprises the step of providing the underside (14) of said bearing housing (10) with at least one female component (12) to enable it to be mounted by inserting at least one male component (24) therein.
6. Method according to any of the preceding claims, characterized in that it comprises the step of providing the underside (14) of said bearing housing (10) with at least one male component to enable it to be mounted by inserting the at least one male component (24) into at least one female component (12).
7. (Method according to any of the preceding claims, characterized in that said bearing housing (10) is arranged to support a shaft (20) having a diameter of 20-100mm.)
8. (Method according to any of the preceding claims, characterized in that said bearing housing (10) is arranged to withstand a dynamic load (C) of 80-300 kN.)
9. Bearing housing (10) having a body, characterized in that at least part of said body comprises extruded material.
10. Bearing housing (10) according to claim 9, characterized in that it comprises extruded metal or metal alloy having an atomic weight that is less than the atomic weight of nickel.
11. Bearing housing (10) according to claim 9 or 10, characterized in that said metal is aluminium or said metal alloy is an aluminium alloy.
12. Bearing housing (10) according to any of claims 9-11 , characterized in that it comprises at least one female component (12) on the underside (1 ) thereof to enable the bearing housing (10) to be mounted by inserting at least one male component (24) into the at least one female component (12).
13. Bearing housing (10) according to any of claims 9-12, characterized in that it comprises at least one male component to enable it to be mounted by inserting the at least one male component (24) into at least one female component (12).
14. (Bearing housing (10) according to any of claims 9-13, characterized in that it is arranged to support a shaft (20) having a diameter of 20-100mm.)
15. (Bearing housing (10) according to any of claims 9-14, characterized in that it is arranged to withstand a dynamic load (C) of 80-300 kN.)
PCT/SE2013/000046 2012-04-19 2013-04-12 Method for manufacturing bearing housing by extrusion WO2013158008A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1200235 2012-04-19
SE1200235-8 2012-04-19

Publications (1)

Publication Number Publication Date
WO2013158008A1 true WO2013158008A1 (en) 2013-10-24

Family

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PCT/SE2013/000046 WO2013158008A1 (en) 2012-04-19 2013-04-12 Method for manufacturing bearing housing by extrusion

Country Status (1)

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WO (1) WO2013158008A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1245833A (en) * 1968-08-30 1971-09-08 Glacier Co Ltd Method of making a bi-metallic strip
US3689124A (en) * 1970-09-11 1972-09-05 Trw Inc Linear motion anti-friction bearing and method of manufacturing
US4361629A (en) * 1980-07-11 1982-11-30 Daido Metal Company Ltd. Bearing material and method of producing same
DE3817755A1 (en) * 1988-05-20 1989-11-30 Mannesmann Ag Roller block
US5431498A (en) * 1994-04-11 1995-07-11 Thomson Industries, Inc. Linear motion bearing
GB2299556A (en) * 1995-03-28 1996-10-09 Lotus Car Extruded wheel carrier
US20040105722A1 (en) * 2001-12-20 2004-06-03 Matthias Gercke Ball and socket joint

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1245833A (en) * 1968-08-30 1971-09-08 Glacier Co Ltd Method of making a bi-metallic strip
US3689124A (en) * 1970-09-11 1972-09-05 Trw Inc Linear motion anti-friction bearing and method of manufacturing
US4361629A (en) * 1980-07-11 1982-11-30 Daido Metal Company Ltd. Bearing material and method of producing same
DE3817755A1 (en) * 1988-05-20 1989-11-30 Mannesmann Ag Roller block
US5431498A (en) * 1994-04-11 1995-07-11 Thomson Industries, Inc. Linear motion bearing
GB2299556A (en) * 1995-03-28 1996-10-09 Lotus Car Extruded wheel carrier
US20040105722A1 (en) * 2001-12-20 2004-06-03 Matthias Gercke Ball and socket joint

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