CN112059554A - Crankshaft journal groove sinking and quenching process - Google Patents
Crankshaft journal groove sinking and quenching process Download PDFInfo
- Publication number
- CN112059554A CN112059554A CN202010935693.9A CN202010935693A CN112059554A CN 112059554 A CN112059554 A CN 112059554A CN 202010935693 A CN202010935693 A CN 202010935693A CN 112059554 A CN112059554 A CN 112059554A
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- China
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- quenching
- journal
- sink
- connecting rod
- turning
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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
Abstract
A crankshaft journal sink tank before quenching process comprises the following steps: a. turning a large-head excircle and a small-head excircle, roughly turning and finely turning a main journal in sequence, and roughly milling and finely turning a connecting rod journal in sequence; b. intermediate cleaning before quenching is carried out; c. carrying out quenching and tempering on the main journal and the connecting rod journal; d. and carrying out intermediate cleaning after quenching. In the manufacturing of the crankshaft, the main journal and the connecting rod journal sink groove are turned firstly, and then quenching treatment is carried out, so that the turning of the high-hardness surface after quenching by an original cutter can be avoided, the loss of the cutter is reduced, the cost is reduced, and the processing efficiency is improved to a certain extent by reducing the time for replacing the cutter.
Description
Technical Field
The invention relates to the technical field of crankshaft machining processes, in particular to a crankshaft journal first groove sinking and then quenching process.
Background
At present, in the processing process flow of the crankshaft, a heat treatment mode comprising quenching is adopted so as to obtain a high-hardness surface layer and favorable internal stress distribution and improve the wear resistance and the fatigue strength. And then, adopting a turning mode to sink the groove, and further shaping the product. However, the surface hardness of the quenched product is high, so that the problem of high cutter loss during turning exists. The general approach is to reduce wear by enhancing the wear resistance and the medium level resistance of the tool, etc.
Disclosure of Invention
The invention aims to provide a crankshaft journal groove-sinking and quenching process, which can reduce the loss of a cutter and reduce the production cost.
The embodiment of the invention is realized by the following technical scheme:
a crankshaft journal sink tank before quenching process comprises the following steps: a. turning a large-head excircle and a small-head excircle, roughly turning and finely turning a main journal in sequence, and roughly milling and finely turning a connecting rod journal in sequence; b. intermediate cleaning before quenching is carried out; c. carrying out quenching and tempering on the main journal and the connecting rod journal; d. and carrying out intermediate cleaning after quenching.
And further, rolling the sinking groove at the main journal and the sinking groove at the connecting rod journal after the step d.
Further, the main journal and the connecting rod journal are further refined after quenching.
Further, the main journal, the connecting rod journal and the large-head excircle are subjected to surface induction quenching treatment, and the hardness of a hardening layer is 50-60 HRC;
the two axial sides of the precipitation tank need not have color change after quenching.
Further, the depth of a hardening layer in the quenching area of all main journals and all connecting rod journals is 1.3-4.0 mm;
the depth of a hardening layer in a quenching area of the excircle of the big end is 1.3-2.5 mm;
and the hardening layer is spaced from the two sides of the sink tank by a certain distance.
Further, flaw detection is performed after quenching.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects: in the manufacturing of the crankshaft, the main journal and the connecting rod journal are turned firstly, and then quenching treatment is carried out, so that the turning of the high-hardness surface after quenching by an original cutter can be avoided, the loss of the cutter is reduced, the cost is reduced, and the processing efficiency is improved to a certain extent by reducing the time for replacing the cutter.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The embodiment provides a crankshaft journal sink tank before quenching process, which comprises the following steps: a. turning a large-head excircle and a small-head excircle, roughly turning and finely turning a main journal in sequence, and roughly milling and finely turning a connecting rod journal in sequence; b. intermediate cleaning before quenching is carried out; c. carrying out quenching and tempering on the main journal and the connecting rod journal; d. and carrying out intermediate cleaning after quenching.
In the manufacturing of the crankshaft, the main journal and the connecting rod journal are turned firstly, and then quenching treatment is carried out, so that the turning of the high-hardness surface after quenching by the original cutter can be avoided, the loss of the cutter is reduced, the cost is reduced, and the processing efficiency is improved to a certain extent by reducing the time for replacing the cutter.
And d, rolling the sinking groove at the main journal and the sinking groove at the connecting rod journal after the step d, namely pressing the roller.
Wherein, after quenching, the main journal and the connecting rod journal are also finely ground.
The quenching is carried out after the operation of turning the sinking groove, the improvement of heating parameters and the modification of a heating inductor in the quenching process are needed, and the aims of only quenching the groove bottom of the sinking groove, setting a heat radiation area deviating from the two axial sides of the sinking groove and not quenching the two axial sides of the sinking groove of the crankshaft are fulfilled. And performing surface induction quenching treatment on the main journal, the connecting rod journal and the large-head excircle, wherein the quenched standard is as follows: the hardness of the hardening layer is 50-60HRC, and the two axial sides of the precipitation tank need not have color change after quenching.
Specifically, induction coils are used for quenching.
The depth of a hardening layer in the quenching areas of all main journals and all connecting rod journals is 1.3-4.0 mm; the depth of a hardening layer in a quenching area of the excircle of the big end is 1.3-2.5 mm. And the quenching layers at the outer circles of all the main journals, all the connecting rod journals and the big end are spaced from the two sides of the sink groove by a certain distance. So as to achieve the effect that the two axial sides of the sink groove have no color change after quenching.
Wherein, flaw detection is required after quenching, the installation of crack defects is performed by JB/T6729, and quenching cracks and grinding cracks generated by quenching quality are not allowed to occur.
Alternatively, the crankshaft described above is manufactured using QT700-2 ductile iron.
The crankshaft is machined by adopting the steps of the special quenching machine tool for the crankshaft. For example, a quenching machine KMCH-2-A-160 can be used for quenching treatment, and corresponding parameter regulation and induction coil improvement are carried out.
The process for quenching workers comprises the following steps:
1. before quenching, scanning a two-dimensional code on the end face of the crankshaft by adopting a handheld code scanning gun;
2. starting a machine, closing monitoring software, and aligning a tool by using a proofreading piece;
3. starting the machine, starting the monitoring software, scanning a workpiece to be machined, carrying out intermediate frequency quenching on the excircle of the shaft neck, taking down the workpiece within a certain time after quenching for low-temperature tempering treatment, then taking down the machined workpiece, checking whether data acquisition is finished, scanning the next workpiece for machining, and carrying out machining again
4. And ending and shutting down.
Correspondingly, when the workpiece to be processed is processed at the beginning, the mark, the line code and the online are printed firstly, and each workpiece is finely monitored.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A crankshaft journal sink tank before quenching process is characterized by comprising the following steps:
a. turning a big-end excircle and a small-end excircle, roughly turning, finely turning a main journal and a sink groove in sequence, and roughly milling and finely turning a connecting rod journal and a sink groove in sequence;
b. intermediate cleaning before quenching is carried out;
c. carrying out quenching and tempering on the main journal and the connecting rod journal;
d. and carrying out intermediate cleaning after quenching.
2. The crankshaft journal sink-first and quench-second process of claim 1, wherein step d is followed by rolling the sink at the main journal and the sink at the connecting rod journal.
3. The crankshaft journal first-groove and later-quenching process according to claim 1, wherein the main journal and the connecting rod journal are further refined after quenching.
4. The crankshaft journal tank-sinking and post-quenching process as claimed in claim 1, wherein the main journal, the connecting rod journal and the large-head outer circle are all subjected to surface induction quenching treatment, and the hardness of a quenching layer is 50-60 HRC;
the two axial sides of the precipitation tank need not have color change after quenching.
5. The crankshaft journal sink-first and then quench process of claim 4, wherein the quench hardening depth in the quenching area of all of the main journals and all of the connecting rod journals is in the range of 1.3-4.0 mm;
the depth of a hardening layer in a quenching area of the excircle of the big end is 1.3-2.5 mm;
and the hardening layer is spaced from the two sides of the sink tank by a certain distance.
6. The crankshaft journal sink-first and quench-second process of claim 1, wherein the quenching is followed by flaw detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010935693.9A CN112059554A (en) | 2020-09-08 | 2020-09-08 | Crankshaft journal groove sinking and quenching process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010935693.9A CN112059554A (en) | 2020-09-08 | 2020-09-08 | Crankshaft journal groove sinking and quenching process |
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| Publication Number | Publication Date |
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| CN112059554A true CN112059554A (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010935693.9A Pending CN112059554A (en) | 2020-09-08 | 2020-09-08 | Crankshaft journal groove sinking and quenching process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969334A (en) * | 2021-10-26 | 2022-01-25 | 山西柴油机工业有限责任公司 | Heat treatment deformation control method for medium-frequency quenching of high-power crankshaft |
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|---|---|---|---|---|
| CN102357785A (en) * | 2011-10-28 | 2012-02-22 | 湖北汽车工业学院 | Fillet rolling technology for automobile air compressor crankshaft |
| CN102777480A (en) * | 2012-07-18 | 2012-11-14 | 道依茨一汽（大连）柴油机有限公司 | Fillet rolling nodular cast iron crankshaft and machining technology thereof |
| CN103194586A (en) * | 2012-01-05 | 2013-07-10 | 广西玉柴机器股份有限公司 | Crankshaft quenching strengthening method |
| CN103867556A (en) * | 2014-04-02 | 2014-06-18 | 广西玉柴机器股份有限公司 | Crankshaft for engine |
| CN105196012A (en) * | 2015-09-23 | 2015-12-30 | 四川飞亚汽车零部件有限公司 | Novel process for processing crankshaft |
| CN105414908A (en) * | 2015-11-19 | 2016-03-23 | 徐州海拓机械制造有限公司 | Nodular cast iron crankshaft casting technology |
| CN106002113A (en) * | 2015-03-31 | 2016-10-12 | 三菱自动车工业株式会社 | A method of manufacturing a crankshaft |
| JP2017072261A (en) * | 2016-12-27 | 2017-04-13 | 住友重機械工業株式会社 | Eccentric oscillation type speed reduction device and process of manufacture of crank shaft |
| CN111421310A (en) * | 2020-04-24 | 2020-07-17 | 新昌县事必达精密制造有限公司 | Efficient machining process for crankshaft |
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2020
- 2020-09-08 CN CN202010935693.9A patent/CN112059554A/en active Pending
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| CN102357785A (en) * | 2011-10-28 | 2012-02-22 | 湖北汽车工业学院 | Fillet rolling technology for automobile air compressor crankshaft |
| CN103194586A (en) * | 2012-01-05 | 2013-07-10 | 广西玉柴机器股份有限公司 | Crankshaft quenching strengthening method |
| CN102777480A (en) * | 2012-07-18 | 2012-11-14 | 道依茨一汽（大连）柴油机有限公司 | Fillet rolling nodular cast iron crankshaft and machining technology thereof |
| CN103867556A (en) * | 2014-04-02 | 2014-06-18 | 广西玉柴机器股份有限公司 | Crankshaft for engine |
| CN106002113A (en) * | 2015-03-31 | 2016-10-12 | 三菱自动车工业株式会社 | A method of manufacturing a crankshaft |
| CN105196012A (en) * | 2015-09-23 | 2015-12-30 | 四川飞亚汽车零部件有限公司 | Novel process for processing crankshaft |
| CN105414908A (en) * | 2015-11-19 | 2016-03-23 | 徐州海拓机械制造有限公司 | Nodular cast iron crankshaft casting technology |
| JP2017072261A (en) * | 2016-12-27 | 2017-04-13 | 住友重機械工業株式会社 | Eccentric oscillation type speed reduction device and process of manufacture of crank shaft |
| CN111421310A (en) * | 2020-04-24 | 2020-07-17 | 新昌县事必达精密制造有限公司 | Efficient machining process for crankshaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113969334A (en) * | 2021-10-26 | 2022-01-25 | 山西柴油机工业有限责任公司 | Heat treatment deformation control method for medium-frequency quenching of high-power crankshaft |
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Application publication date: 20201211 |
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