CN109048232A - A method of forging railway bearing lasso outer ring raceway streamline - Google Patents
A method of forging railway bearing lasso outer ring raceway streamline Download PDFInfo
- Publication number
- CN109048232A CN109048232A CN201811095228.8A CN201811095228A CN109048232A CN 109048232 A CN109048232 A CN 109048232A CN 201811095228 A CN201811095228 A CN 201811095228A CN 109048232 A CN109048232 A CN 109048232A
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- Prior art keywords
- rolling
- clout
- outer ring
- raceway
- forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/003—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass bearings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Forging (AREA)
Abstract
Invention is related to a kind of method for forging railway bearing lasso outer ring raceway streamline, and a, selection prepare the raw material of bearing ring, and raw material obtain material section 1 after shearing by sawing machine；B, material section 1 is put into heating furnace and is heated, jumping-up is carried out after heating；C, the material section 1 in step b is subjected to backward extrusion.The stamping die of press machine cooperation press machine is punched out.Go out blind hole 2 and clout 3.Clout 3 is annular.Coal dust lubricated dies are added when punching or in formed punch front coating lubricating oil.At this moment the height for expecting section 1 is 185mm；D, clout 3 is separated with blind hole 2.Angle in flattening clout 3 to 172mm after separation and modifying simultaneously；E, the planar end surface of the clout 3 in step d is sent on Ring Rolling Machine and carries out rolling.3 rolling of clout obtains the outer ring forging 5 with raceway 4.Rolling repeatedly recycles；F, it is examined by shaping, obtains the outer ring forging for the bearing ring that metal streamline is distributed along raceway.It is reverse that the present invention changes outer ring raceway streamline.
Description
Technical field
The present invention relates to bearing ring preparation field, in particular to a kind of forging railway bearing lasso outer ring raceway streamline
Method.
Background technique
In process, internal stomata is loose and various Inclusions Along deformation direction elongations, in fibre for metal material
Tie up shape distribution.On its longitudinal section after polished and acid corrosion, it can be seen that the lines of striated, referred to as metal fibrous tissue or
Metal streamline.Metal streamline is that the low melting point ingredient and banded structure in metal are segregated in rolling or stretch and formed when squeezing
's.
For bearing, the main damage form for influencing bearing life is fatigue flake, and the fatigue flake of bearing and gold
Belonging to streamline has much relations.The cutting metal of traditional handicraft, which forms raceway, causes stock utilization low, by larger chipping allowance
The raceway for processing obtained bearing ring has cut off metal streamline, and metal streamline occurs reverse.
Summary of the invention
In view of the deficiencies of the prior art, the invention discloses a kind of sides for forging railway bearing lasso outer ring raceway streamline
Method.
The technical solution adopted in the present invention is as follows:
1, a kind of method for forging railway bearing lasso outer ring raceway streamline, it is characterised in that the following steps are included:
A, selection prepares the raw material of bearing ring, and raw material obtain material section after shearing by sawing machine；
B, material section is put into heating furnace and is heated to 1150 DEG C~1200 DEG C, carry out jumping-up after heating；Jumping-up makes to expect section
Height reduces and cross section increases；
C, the material section in step b is subjected to backward extrusion；The stamping die of press machine cooperation press machine is punched out；The punching
Compression mould is the forming punching head that diameter is 85mm；Go out blind hole and clout；Clout is annular；Coal dust lubricated dies are added when punching
Or in formed punch front coating lubricating oil；Obtain the material section that height is 185mm；
D, clout is separated with blind hole；Clout is flattened with press machine to 172mm after separation and while modifying interior angle；
E, the planar end surface of the clout in step d is sent on Ring Rolling Machine and carries out repeatedly circulation rolling；Clout rolling obtains band
The outer ring forging of raceway；Reduction 0.5mm~1.0mm when the outer diameter surplus of outer ring is relative to first rolling when secondary rolling eventually, it is secondary eventually
Increase 0.5mm~1.0mm when the diameter surplus of raceway is relative to first rolling when rolling；Obtaining temperature is 850 DEG C~900 DEG C
Outer ring forging；
F, it is examined by shaping, obtains the outer ring forging for the bearing ring that metal streamline is distributed along raceway.
Its further technical characteristic are as follows: the press machine in step c and step d provides the pressure of 6300kN.
Its further technical characteristic are as follows: the planar end surface of the clout in step d is sent on Ring Rolling Machine and is repeatedly recycled
Rolling；Clout rolling obtains the outer ring forging with raceway；Eventually when time rolling the outer diameter surplus of outer ring relative to first rolling when subtract
Few 0.5mm, eventually when time rolling the diameter surplus of raceway relative to first rolling when increase 0.5mm；At this moment forging temperature in outer ring exists
850 DEG C~900 DEG C.
Beneficial effects of the present invention are as follows:
In bearing ring, metal streamline parallel with the working surface of bearing ring is best.With formed by working surface
The bigger angle the more bad, is worst perpendicular to working surface.Bearing ring can be obviously improved using process flow of the invention
Metal streamline shape, metal streamline distribution is ideal, improves the reverse phenomenon of the outer ring raceway streamline of bearing ring, improves bearing
The quality of lasso improves the average life of bearing ring.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Fig. 2 is the sectional view of material section of the invention.
Cross-sectional view of the structure when Fig. 3 is jumping-up of the present invention.
Cross-sectional view of the structure when Fig. 4 is backward extrusion of the present invention.
Fig. 5 is cross-sectional view of the structure when present invention separation flattens.
Fig. 6 is cross-sectional view of the structure when rolling of the present invention rolls.
In figure: 1, expecting section；2, blind hole；3, clout；4, raceway；5, outer ring forging.
Specific embodiment
With reference to the accompanying drawing and three embodiments for preparing K grades of railway bearing lassos, illustrate that forging bearing sleeve ring outer ring is rolled
The method of road streamline, bearing ring include outer ring and inner ring.Fig. 1 is process flow chart of the invention.As shown in Figure 1, preparing axis
The outer ring of bearing ring and inner ring include the following steps.
A, selection prepares the raw material of bearing ring, and raw material obtain material section 1 after shearing by sawing machine.
B, material section 1 is put into heating furnace and is heated to 1150 DEG C~1200 DEG C, carry out jumping-up after heating.Jumping-up makes to expect section 1
Height reduce and cross section increase.
C, the material section 1 in step b is subjected to backward extrusion.The stamping die of press machine cooperation press machine is punched out.Punching press
Mold is the forming punching head that diameter is 85mm.Go out blind hole 2 and clout 3.Blind hole 2 goes out material and can do other bearing rings.
Clout 3 is annular.Coal dust lubricated dies are added when punching or in formed punch front coating lubricating oil.Obtain the material that height is 185mm
Section 1.
D, clout 3 is separated with blind hole 2.Clout 3 is provided to the power of 6300kN with press machine after separation, flatten to 172mm
And angle in modifying simultaneously.
E, the planar end surface of the clout 3 in step d is sent on Ring Rolling Machine and carries out repeatedly circulation rolling.3 rolling of clout obtains
Outer ring forging 5 with raceway 4.Reduction 0.5mm~1.0mm when the outer diameter surplus of outer ring is relative to first rolling when secondary rolling eventually,
Increase 0.5mm~1.0mm when the diameter surplus of raceway 4 is relative to first rolling when secondary rolling eventually.Obtain temperature be 850 DEG C~
900 DEG C of outer ring forging 5.
F, it is examined by shaping, obtains the outer ring forging 5 for the bearing ring that metal streamline is distributed along raceway 4.
Embodiment 1:
A, Fig. 2 is material section sectional view of the invention.As shown in Fig. 2, selection prepares the raw material of K grades of railway bearing lassos
GCr15, K grades of railway bearing lassos are designed according to AAR standard M-934.GCr15 is high carbon chromium, and GCr15 passes through model
Material section 1 is obtained after the computerized numerical control sawing machine shearing of GZ4230.
B, cross-sectional view of the structure when Fig. 3 is jumping-up of the present invention.As shown in figure 3, will material 1 level of section be put into volume be 1160 ×
It is heated to 1150 DEG C in 1025 × 4500 heating furnace, jumping-up is carried out after heating.Jumping-up reduces the height for expecting section 1 and cross section
Increase.
C, cross-sectional view of the structure when Fig. 4 is backward extrusion of the present invention.As shown in figure 4, being squeezed the material section 1 in step b is counter
Pressure.The stamping die of press machine cooperation press machine is punched out.Stamping die is the forming punching head that diameter is 85mm.Go out blind hole
2 and clout 3.Clout 3 is annular.Coal dust lubricated dies are added when punching or in formed punch front coating lubricating oil.Obtaining height is
The material section 1 of 185mm.
D, Fig. 5 is cross-sectional view of the structure when present invention separation flattens.As shown in figure 5, clout 3 is separated with blind hole 2.Separation
Clout 3 is provided to the power of 6300kN with press machine afterwards, flatten to 172mm and modify interior angle simultaneously.
E, Fig. 6 is cross-sectional view of the structure when rolling of the present invention rolls.As shown in fig. 6, by the flush end of the clout 3 in step d
Face, which is sent on Ring Rolling Machine, carries out repeatedly circulation rolling.3 rolling of clout obtains the outer ring forging 5 with raceway 4.Outer ring when secondary rolling eventually
Outer diameter surplus relative to first rolling when reduce 1.0mm, when the diameter surplus of raceway 4 is relative to first rolling when time rolling eventually
Increase 1.0mm.Obtaining temperature is 850 DEG C of outer ring forging 5.
F, it is examined by shaping, obtains the outer ring forging 5 for the bearing ring that metal streamline is distributed along raceway 4.
Metal streamline is that GCr15 is stretched in rolling or extruding and formed.On the longitudinal section of the outer ring of bearing ring
After polished and acid corrosion, it can be seen that the lines of striated.
Embodiment 2:
A, Fig. 2 is material section sectional view of the invention.As shown in Fig. 2, selection prepares the raw material of K grades of railway bearing lassos
GCr15.Material section 1 is obtained after the computerized numerical control sawing machine shearing that GCr15 passes through model GZ4230.
B, cross-sectional view of the structure when Fig. 3 is jumping-up of the present invention.As shown in figure 3, will material 1 level of section be put into volume be 1160 ×
It is heated to 1200 DEG C in 1025 × 4500 heating furnace, jumping-up is carried out after heating.Jumping-up reduces the height for expecting section 1 and cross section
Increase.
C, cross-sectional view of the structure when Fig. 4 is backward extrusion of the present invention.As shown in figure 4, being squeezed the material section 1 in step b is counter
Pressure.The stamping die of press machine cooperation press machine is punched out.Stamping die is the forming punching head that diameter is 85mm.Go out blind hole
2 and clout 3.Clout 3 is annular.Coal dust lubricated dies are added when punching or in formed punch front coating lubricating oil.Obtaining height is
The material section 1 of 185mm.
D, Fig. 5 is cross-sectional view of the structure when present invention separation flattens.As shown in figure 5, clout 3 is separated with blind hole 2.Separation
Clout 3 is provided to the power of 6300kN with press machine afterwards, flatten to 172mm and modify interior angle simultaneously.
E, Fig. 6 is cross-sectional view of the structure when rolling of the present invention rolls.As shown in fig. 6, by the flush end of the clout 3 in step d
Face, which is sent on Ring Rolling Machine, carries out repeatedly circulation rolling.3 rolling of clout obtains the outer ring forging 5 with raceway 4.Outer ring when secondary rolling eventually
Outer diameter surplus relative to first rolling when reduce 0.5mm, when the diameter surplus of raceway 4 is relative to first rolling when time rolling eventually
Increase 0.5mm.Obtaining temperature is 900 DEG C of outer ring forging 5.
F, it is examined by shaping, obtains the outer ring forging 5 for the bearing ring that metal streamline is distributed along raceway 4.
Metal streamline is that GCr15 is stretched in rolling or extruding and formed.On the longitudinal section of the outer ring of bearing ring
After polished and acid corrosion, it can be seen that the lines of striated.
Embodiment 3:
A, Fig. 2 is material section sectional view of the invention.As shown in Fig. 2, selection prepares the raw material of K grades of railway bearing lassos
G20Cr2Ni4, G20Cr2Ni4 are carburizing steel, obtain material section after the computerized numerical control sawing machine shearing that G20Cr2Ni4 passes through model GZ4230
1。
B, cross-sectional view of the structure when Fig. 3 is jumping-up of the present invention.As shown in figure 3, will material 1 level of section be put into volume be 1160 ×
1200 DEG C are heated in 1025 × 4500 heating furnace, jumping-up after heating.Jumping-up reduces the height for expecting section 1 and cross section increasing
Greatly.
C, cross-sectional view of the structure when Fig. 4 is backward extrusion of the present invention.As shown in figure 4, being squeezed the material section 1 in step b is counter
Pressure.The stamping die of press machine cooperation press machine is punched out.Stamping die is the forming punching head that diameter is 85mm.Go out blind hole
2 and clout 3.Clout 3 is annular.Coal dust lubricated dies are added when punching or in formed punch front coating lubricating oil.Obtaining height is
185mm expects section 1.
D, Fig. 5 is cross-sectional view of the structure when present invention separation flattens.As shown in figure 5, clout 3 is separated with blind hole 2.Separation
Clout 3 is provided to the power of 6300kN with press machine with press machine afterwards, flatten to 172mm and modify interior angle simultaneously.
E, Fig. 6 is cross-sectional view of the structure when rolling of the present invention rolls.As shown in fig. 6, by the flush end of the clout 3 in step d
Face, which is sent on Ring Rolling Machine, carries out repeatedly circulation rolling.3 rolling of clout obtains the outer ring forging 5 with raceway 4.Outer ring when secondary rolling eventually
Outer diameter surplus relative to first rolling when reduce 0.5mm, when the diameter surplus of raceway 4 is relative to first rolling when time rolling eventually
Increase 0.5mm.Obtaining temperature is 900 DEG C of outer ring forging 5.
F, it is examined by shaping, obtains the outer ring forging 5 for the bearing ring that metal streamline is distributed along raceway 4.
Metal streamline is that G20Cr2Ni4 is stretched in rolling or extruding and formed.Vertical in the outer ring of bearing ring cuts
On face after polished and acid corrosion, it can be seen that the lines of striated.
The selection of computerized numerical control sawing machine, the power of heating furnace and press machine and model is the common knowledge of this field, can be by this
Field technical staff selects and adjusts as needed.
The metal streamline of the outer ring raceway of the K grade bearing ring manufactured using process flow of the invention does not occur inverse again
To the streamline for changing outer ring raceway is reverse, greatly improves the service life of bearing ring.
Above description is explanation of the invention, is not intended to limit the invention, and limited range of the present invention is referring to right
It is required that the present invention can make any type of modification without prejudice to basic structure of the invention.
Claims (3)
1. a kind of method for forging railway bearing lasso outer ring raceway streamline, it is characterised in that the following steps are included:
A, selection prepares the raw material of bearing ring, and raw material obtain material section (1) after shearing by sawing machine；
B, material section (1) is put into heating furnace and is heated to 1150 DEG C~1200 DEG C, carry out jumping-up after heating；Jumping-up makes to expect section (1)
Height reduce and cross section increase；
C, the material section (1) in step b is subjected to backward extrusion；The stamping die of press machine cooperation press machine is punched out；The punching
Compression mould is the forming punching head that diameter is 85mm；Go out blind hole (2) and clout (3)；Clout (3) is annular；Coal is added when punching
Powder lubricated dies or in formed punch front coating lubricating oil；Obtain the material section (1) that height is 185mm；
D, clout (3) is separated with blind hole (2)；Clout (3) is flattened with press machine to 172mm after separation and modifies interior angle simultaneously
Degree；
E, the planar end surface of the clout (3) in step d is sent on Ring Rolling Machine and carries out repeatedly circulation rolling；Clout (3) rolling obtains
Outer ring forging (5) with raceway (4)；Eventually when time rolling the outer diameter surplus of outer ring relative to first rolling when reduce 0.5mm~
1.0mm, increase 0.5mm~1.0mm when the diameter surplus of raceway (4) is relative to first rolling when secondary rolling eventually；Obtaining temperature is
850 DEG C~900 DEG C of outer ring forging (5)；
F, it is examined by shaping, obtains the outer ring forging (5) for the bearing ring that metal streamline is distributed along raceway (4).
2. the method for forging railway bearing lasso outer ring raceway streamline according to claim 1, it is characterised in that: step c
The pressure of 6300kN is provided with the press machine in step d.
3. the method for forging railway bearing lasso outer ring raceway streamline according to claim 1, it is characterised in that: by step
The planar end surface of clout (3) in d, which is sent on Ring Rolling Machine, carries out repeatedly circulation rolling；Clout (3) rolling obtains outer with raceway (4)
It encloses forging (5)；Eventually when time rolling the outer diameter surplus of outer ring relative to first rolling when reduce 0.5mm, raceway (4) when time rolling eventually
Diameter surplus relative to first rolling when increase 0.5mm；At this moment forging (5) temperature in outer ring is at 850 DEG C~900 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811095228.8A CN109048232A (en) | 2018-09-19 | 2018-09-19 | A method of forging railway bearing lasso outer ring raceway streamline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811095228.8A CN109048232A (en) | 2018-09-19 | 2018-09-19 | A method of forging railway bearing lasso outer ring raceway streamline |
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| CN109048232A true CN109048232A (en) | 2018-12-21 |
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| CN201811095228.8A Pending CN109048232A (en) | 2018-09-19 | 2018-09-19 | A method of forging railway bearing lasso outer ring raceway streamline |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109909437A (en) * | 2019-05-05 | 2019-06-21 | 临清市同兴轴承锻造有限公司 | A kind of bearing ring forging processing technology and its system of processing |
| CN111230409A (en) * | 2019-12-31 | 2020-06-05 | 武汉理工大学 | Bearing raceway streamline control near-net forming process |
| CN112404337A (en) * | 2020-10-21 | 2021-02-26 | 洛阳市洛凌轴承科技股份有限公司 | NU2300 series bearing sleeve forging process |
| CN112846055A (en) * | 2020-12-16 | 2021-05-28 | 哈尔滨工业大学 | Forging forming method for aero-engine roller bearing ring capable of controlling reasonable distribution of metal flow lines |
| CN114589463A (en) * | 2022-03-10 | 2022-06-07 | 西北工业大学 | L-shaped high-temperature bearing ring forming method |
| CN115415473A (en) * | 2022-09-19 | 2022-12-02 | 哈尔滨工业大学 | Automatic forging method for bearing ring of aero-engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101402163A (en) * | 2007-10-07 | 2009-04-08 | 襄樊市汇聚龙机械制造有限公司 | Bearing ferrule workblank triple external member smithing and molding process |
| US20150068264A1 (en) * | 2009-12-02 | 2015-03-12 | Nsk, Ltd. | Manufacturing method for bearing outer ring |
| CN104493439A (en) * | 2014-11-28 | 2015-04-08 | 江阴吉爱倍万达精工有限公司 | Orging process of outer blank for double-row tapered roller bearings |
| CN108465770A (en) * | 2018-04-20 | 2018-08-31 | 洛阳Lyc轴承有限公司 | A kind of rational EMU bearing internal external circle forging forming method of streamline distribution |
| CN108500196A (en) * | 2018-03-12 | 2018-09-07 | 希西维轴承（盱眙）有限公司 | A kind of double-row bearing part double channel rolling core roller and its forging method |
-
2018
- 2018-09-19 CN CN201811095228.8A patent/CN109048232A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101402163A (en) * | 2007-10-07 | 2009-04-08 | 襄樊市汇聚龙机械制造有限公司 | Bearing ferrule workblank triple external member smithing and molding process |
| US20150068264A1 (en) * | 2009-12-02 | 2015-03-12 | Nsk, Ltd. | Manufacturing method for bearing outer ring |
| CN104493439A (en) * | 2014-11-28 | 2015-04-08 | 江阴吉爱倍万达精工有限公司 | Orging process of outer blank for double-row tapered roller bearings |
| CN108500196A (en) * | 2018-03-12 | 2018-09-07 | 希西维轴承（盱眙）有限公司 | A kind of double-row bearing part double channel rolling core roller and its forging method |
| CN108465770A (en) * | 2018-04-20 | 2018-08-31 | 洛阳Lyc轴承有限公司 | A kind of rational EMU bearing internal external circle forging forming method of streamline distribution |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109909437A (en) * | 2019-05-05 | 2019-06-21 | 临清市同兴轴承锻造有限公司 | A kind of bearing ring forging processing technology and its system of processing |
| CN111230409A (en) * | 2019-12-31 | 2020-06-05 | 武汉理工大学 | Bearing raceway streamline control near-net forming process |
| CN111230409B (en) * | 2019-12-31 | 2021-05-18 | 武汉理工大学 | Bearing raceway streamline control near-net forming process |
| CN112404337A (en) * | 2020-10-21 | 2021-02-26 | 洛阳市洛凌轴承科技股份有限公司 | NU2300 series bearing sleeve forging process |
| CN112404337B (en) * | 2020-10-21 | 2024-04-12 | 洛阳市洛凌轴承科技股份有限公司 | NU2300 series bearing sleeve forging process |
| CN112846055A (en) * | 2020-12-16 | 2021-05-28 | 哈尔滨工业大学 | Forging forming method for aero-engine roller bearing ring capable of controlling reasonable distribution of metal flow lines |
| CN114589463A (en) * | 2022-03-10 | 2022-06-07 | 西北工业大学 | L-shaped high-temperature bearing ring forming method |
| CN115415473A (en) * | 2022-09-19 | 2022-12-02 | 哈尔滨工业大学 | Automatic forging method for bearing ring of aero-engine |
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Application publication date: 20181221 |