CN117086749A - Polishing tile for local quenching of crankshaft journal - Google Patents
Polishing tile for local quenching of crankshaft journal Download PDFInfo
- Publication number
- CN117086749A CN117086749A CN202310950584.8A CN202310950584A CN117086749A CN 117086749 A CN117086749 A CN 117086749A CN 202310950584 A CN202310950584 A CN 202310950584A CN 117086749 A CN117086749 A CN 117086749A
- Authority
- CN
- China
- Prior art keywords
- polishing
- journal
- quenching
- polishing pad
- tile
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 103
- 238000010791 quenching Methods 0.000 title claims abstract description 43
- 230000000171 quenching effect Effects 0.000 title claims abstract description 42
- 238000011156 evaluation Methods 0.000 claims abstract description 13
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/02—Machines or devices using grinding or polishing belts; Accessories therefor for grinding rotationally symmetrical surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/18—Accessories
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
- C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a polishing pad for locally quenching a crankshaft journal. The polishing pad comprises a polishing pad body, wherein a plurality of grooves are formed in the two side faces of the polishing pad body along the inner ring in a tooth shape. The invention ensures that the polishing deformation of non-quenching areas on two sides of the journal is less than or equal to that of a middle quenching area, and the journal bulge which is kept in the cylindricity evaluation width range is not increased before and after polishing, thereby ensuring the barrel surface degree of the journal and the cylindricity of the journal.
Description
Technical Field
The invention belongs to the technical field of crankshaft polishing tiles, and particularly relates to a polishing tile for local quenching of a crankshaft journal.
Background
A certain crankshaft main journal and connecting rod journal (hereinafter, referred to as journal for short) require local quenching, as shown in fig. 1, wherein 1 is an induction quenching zone, 2 is non-quenching zones on two sides of the journal, and 3 is a sink groove on two sides.
In order to achieve a better lubricating effect of the journal and reduce uneven wear of the bearing bush, the crankshaft journal adopts a middle drum-shaped bulge design, the crankshaft drum-shaped quantity is measured and evaluated by using a drum surface degree, the evaluation width is 10mm, and as shown in figure 2, the drum surface degree is ensured by grinding wheel finishing in the finish grinding process before the journal polishing.
The journal also had a cylindricity requirement, which evaluated the width (12 mm), as shown in FIG. 3.
The cylindricity evaluation width (12 mm) of the journal is larger than the median value 11.5mm defined by the induction quenching width of the journal, namely, the journal quenching high hardness zone and the non-quenching ordinary hardness zone are covered, and as shown in fig. 4, the removed material amount of the non-quenching (low hardness) zone is larger than that of the quenching (high hardness) zone under the same polishing power.
The polishing process structure comprises a polishing soft tile 1, a polishing belt 2, a polishing hard tile 3 and a journal 4, wherein 5 is a conveying device, and 6 is an abrasive belt frame, as shown in fig. 6, the polishing time is shortened, the polishing pressure is reduced, and the cylindricity and the barrelhead are difficult to be qualified simultaneously when the equipment precision is adjusted to the optimal state under the condition that the polishing roughness is qualified.
The reason that the barrel surface degree and cylindricity of the existing journal polishing are difficult to be qualified at the same time is that:
in order to ensure the barrel surface degree, the middle of the shaft neck is required to be protruded, so that the cylindricity is increased, and if the protrusion is insufficient, the barrel surface degree is unqualified; the cylindricity measurement evaluation length is larger than the journal quenching width definition median value, the non-quenching area with low hardness is larger in polishing quantity than the quenching area with high hardness, and more materials are removed, so that the relative heights of the middle bulges with the outer diameters of the two sides corresponding to the non-quenching area and the quenching area become larger after polishing, and the cylindricity is easier to exceed the upper limit, as shown in fig. 5.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a polishing pad for locally quenching a crankshaft journal.
The technical scheme adopted by the invention is as follows: the polishing shoe comprises a polishing shoe body, wherein a plurality of grooves are formed in two side surfaces of the polishing shoe body along an inner ring in a tooth shape.
In a further preferable structure, 3 grooves are formed on each side of the polishing pad body.
Further preferred is a structure in which the groove is 1mm deep.
Further preferred is a configuration wherein the slot is 18.6 degrees long.
In a further preferred configuration, the width between two adjacent grooves is smaller than the cylindricity evaluation width.
Further preferred is a structure in which the distance between the adjacent two grooves is 11mm to 11.2mm.
Further preferred structure, the polishing tile body thickness is 16 mm-16.01 mm.
In a further preferable configuration, the polishing pad is provided on the journal outer ring on the belt sander side.
The polishing device for the partial quenching of the crankshaft journal comprises a polishing tile for the partial quenching of the crankshaft journal, wherein one side of the journal is provided with an abrasive belt frame, the other side of the journal is provided with a conveying device, and the polishing tile is arranged on an outer ring of the journal at the side of the abrasive belt frame.
And the outer ring of the journal is also provided with a polishing soft tile.
The invention is suitable for polishing the journal with qualified barrel surface and cylindricity under the condition that the hardness difference of the journal surface is generated due to the quenching area and the non-quenching area after the main journal and the connecting rod journal of the crankshaft are locally quenched, the force of the polishing pad applied to the non-quenching area on the journal is reduced, the removal amount of polishing materials in the non-quenching area is reduced, and the polishing deformation amount of the whole journal is ensured to be uniform, thereby ensuring that the barrel surface and cylindricity are qualified at the same time.
The invention ensures that the polishing deformation of non-quenching areas on two sides of the journal is less than or equal to that of a middle quenching area, and the journal bulge which is kept in the cylindricity evaluation width range is not increased before and after polishing, thereby ensuring the barrel surface degree of the journal and the cylindricity of the journal.
Drawings
FIG. 1 is a schematic view of a partial quench of a crankshaft journal (connecting rod neck);
FIG. 2 is a schematic diagram of a crankshaft journal (connecting rod neck) stave evaluation width;
FIG. 3 is a schematic view of a crankshaft journal (connecting rod journal) cylindricity evaluation width;
FIG. 4 is a schematic diagram of the relationship between the quenching zone of the crankshaft journal (connecting rod journal) and the cylindricity evaluation width;
FIG. 5 is a schematic view of a polishing pad assembly;
FIG. 6 is a schematic diagram of barrel surface degree variation before and after partial quenching and polishing of a journal;
FIG. 7 is a schematic view of a prior art crank journal polishing shoe construction;
fig. 8 is a schematic view of the structure of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in FIG. 8, the polishing pad comprises a polishing pad body a, wherein a plurality of grooves b are formed on two side surfaces of the polishing pad body a along the inner ring in a tooth shape.
A preferred embodiment: and 3 grooves b are respectively processed on two sides of the polishing tile body a.
The groove b is 1mm deep.
Groove b is 18.6 degrees long.
The width between two adjacent grooves b is smaller than the cylindricity evaluation width.
The distance between two adjacent grooves b is 11 mm-11.2 mm.
The thickness of the polishing tile body a is 16 mm-16.01 mm.
The polishing pad is arranged on the outer ring of the shaft neck 4 at the side of the abrasive belt frame.
One side of the journal 4 is provided with an abrasive belt frame 6, the other side is provided with a conveying device 5, and the polishing tile is arranged on the outer ring of the journal 4 at the side of the abrasive belt frame 6.
The outer ring of the journal 4 is also provided with a polishing soft tile 1.
Examples:
in the fine grinding process before polishing, the finish polishing is carried out by a grinding wheel, so that the barrel surface degree of the journal within the width range of 10mm after the finish polishing is qualified, and the outer diameter and roundness of the journal are qualified.
The original polishing tile is mounted on a polishing machine, a polishing belt with the thickness of 0.24mm is mounted between the polishing tile and a crankshaft journal for polishing, and the conventional polishing tile structure is shown in figure 7, wherein the thickness of the polishing belt is 0.18mm, and the polishing diameter phi 41.49-42.008 mm.
And under the condition that the polishing roughness is qualified, the polishing time of the original polishing tile is shortened, the polishing pressure is reduced, and when the equipment precision is adjusted to an optimal state, the cylindricity and the barreling degree are determined to be still unable to be qualified at the same time, the cylindricity is found to be close to the upper limit, and the barreling degree is found to be close to the lower limit, so that the size of the part is out of tolerance, as shown in table 1.
Table 1: journal cylindricity and barrel surface degree after polishing of original polishing tile
The polishing tile comprises:
and corresponding journal non-quenching areas on two sides of the polishing tile, and symmetrically forming three grooves respectively: the groove depth was 1mm and the groove length was 18.6 degrees, and both sides corresponded to the groove distance 11 (0, +0.2), as shown in FIG. 8.
Tooth-shaped grooves on two sides of the polishing tile fall into the cylindricity evaluation width of 12mm, so that polishing force of a non-quenched area in the cylindricity evaluation width can be reduced, and the removal amount of polishing materials in the non-quenched area is reduced.
And installing a new polishing tile on the polishing machine, and installing a polishing belt with the thickness of 0.24mm between the polishing tile and the shaft diameter of the crankshaft.
And after the polishing tile and the polishing belt are installed, the original polishing process parameters are adopted to start polishing production, the roughness, the barrel surface degree and the coaxiality of the polished shaft neck are all qualified, and the barrel surface degree size can be controlled to be the tolerance median value under the condition that the cylindricity is qualified, and the table 2 is shown.
Table 2: the polishing pad of the patent has the advantages of journal cylindricity and barrel surface cylindricity after polishing
After the manufacture of the polishing tiles with tooth grooves on the two sides of the invention is completed, the polishing tiles are installed on a polishing machine to process a crankshaft test, and the cylindricity and the barrelled face of the crankshaft are qualified.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. A polishing shoe for localized quenching of a crankshaft journal, characterized by: the polishing pad comprises a polishing pad body, wherein a plurality of grooves are formed in the two side faces of the polishing pad body along the inner ring in a tooth shape.
2. A polishing pad for localized quenching of crank journals as claimed in claim 1 wherein: and 3 grooves are respectively processed on two sides of the polishing tile body.
3. A polishing pad for localized quenching of crank journals as claimed in claim 2 wherein: the groove was 1mm deep.
4. A polishing pad for localized quenching of crank journals as claimed in claim 2 wherein: the slot length is 18.6 degrees.
5. A polishing pad for localized quenching of crank journals as claimed in claim 1 wherein: the width between two adjacent grooves is smaller than the cylindricity evaluation width.
6. A polishing pad for localized quenching of crank journals as claimed in claim 1 wherein: the distance between two adjacent grooves is 11 mm-11.2 mm.
7. A polishing pad for localized quenching of crank journals as claimed in claim 1 wherein: the thickness of the polishing tile body is 16 mm-16.01 mm.
8. A polishing pad for localized quenching of crank journals as claimed in claim 1 wherein: and the polishing shoe is arranged on the outer ring of the shaft neck at the side of the abrasive belt frame.
9. A polishing device for local quenching of a crankshaft journal, which is characterized in that: a polishing shoe for the partial quenching of a crankshaft journal comprising the polishing shoe according to any one of claims 1-8, said journal being provided with a belt carrier on one side and a conveyor on the other side, said polishing shoe being provided on the outer journal ring on the belt carrier side.
10. A polishing apparatus for localized quenching of crank shaft journals as claimed in claim 9 wherein: and the outer ring of the journal is also provided with a polishing soft tile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310950584.8A CN117086749A (en) | 2023-07-31 | 2023-07-31 | Polishing tile for local quenching of crankshaft journal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310950584.8A CN117086749A (en) | 2023-07-31 | 2023-07-31 | Polishing tile for local quenching of crankshaft journal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117086749A true CN117086749A (en) | 2023-11-21 |
Family
ID=88776255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310950584.8A Pending CN117086749A (en) | 2023-07-31 | 2023-07-31 | Polishing tile for local quenching of crankshaft journal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117086749A (en) |
-
2023
- 2023-07-31 CN CN202310950584.8A patent/CN117086749A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination |