CN111992999A - Automobile precision stepped shaft cylindrical grinding process - Google Patents
Automobile precision stepped shaft cylindrical grinding process Download PDFInfo
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- CN111992999A CN111992999A CN202010707810.6A CN202010707810A CN111992999A CN 111992999 A CN111992999 A CN 111992999A CN 202010707810 A CN202010707810 A CN 202010707810A CN 111992999 A CN111992999 A CN 111992999A
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Abstract
The invention discloses an external circle grinding processing technology of an automobile precision stepped shaft, which comprises the steps of positioning reference, rough turning of an external circle, tempering, primary center hole finishing, fine turning of the external circle, secondary center hole finishing, grinding and inspection, wherein hot rolled steel is placed into a vessel filled with mineral oil again for cooling, and the temperature of the hot rolled steel is reduced to 400 ℃. The invention relates to the technical field of automobile stepped shaft machining, in particular to an automobile precision stepped shaft excircle grinding machining process, which can improve the machinability by a method of triple heat treatment of annealing, quenching and tempering on a stepped shaft; the residual stress is eliminated, the size is stabilized, and the deformation and crack tendency is reduced; the method has the advantages that crystal grains are refined, the structure is adjusted, the structure defects are eliminated, meanwhile, after quenching and tempering, under the cooling work of oil cooling and brine cooling, and each time of heat treatment, the surface of the stepped shaft is polished by abrasive paper, so that the surface of the stepped shaft can be smoother, and meanwhile, the strength of steel can be improved.
Description
Technical Field
The invention relates to the technical field of stepped shafts, in particular to an external circle grinding process for an automobile precision stepped shaft.
Background
Along with the continuous improvement of people's living standard, more and more families have all possessed the car, the car has brought conveniently in the aspect of giving people's the trip, and the step shaft is an essential part on the car, the step shaft is a method of bearing axial positioning, the step shaft cover is particularly suitable for accurate bearing configuration, compare with threaded lock nut, it beats littleer and provides higher precision, the step shaft cover is used for super high speed main shaft usually, to this kind of main shaft, traditional locking device can't provide sufficient precision to it.
However, at present, when the outer circle of the automobile stepped shaft is machined and ground, the stepped shaft needs to be quenched and tempered, when the stepped shaft is quenched and tempered, the residual stress of the stepped shaft cannot be eliminated only through quenching and tempering, and the quenched and tempered shaft is cooled by natural cooling or water cooling, so that soft points which are not quenched and low in toughness are easily generated, and the cutting work is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an automobile precision stepped shaft outer circle grinding processing technology, which solves the problems that when the outer circle of an automobile stepped shaft is processed and ground, the stepped shaft needs to be quenched and tempered, and when the stepped shaft is quenched and tempered, the residual stress of the stepped shaft cannot be eliminated only through quenching and tempering, and the quenching and tempering modes of the stepped shaft adopt natural cooling or water cooling, so that soft points which are not quenched and hard are easily generated, the hardness is high, and the cutting work is influenced.
In order to achieve the purpose, the invention is realized by the following technical scheme: an outer circle grinding process for an automobile precision stepped shaft comprises the following steps:
s1, positioning reference: clamping the excircle of a hot rolled steel blank by using a three-jaw self-centering chuck, taking the excircle of the blank as a rough reference, machining an end face on the excircle of the blank, drilling a central hole by using a central drill, turning the excircle of one end of the central hole, then clamping the turned excircle by using the three-jaw self-centering chuck as a reference, machining the other end face of the excircle of the blank, and drilling another central hole to enable the central holes at two ends of the excircle of the blank to be positioned on the same horizontal shaft;
s2, roughly turning the outer circle: after the center hole of the excircle of the blank is machined, a tailstock center of a lathe is used for propping the center hole of the excircle of the blank, after propping, the lathe is used for roughly turning the surface of the excircle of the blank, and a step-shaped excircle is turned;
s3, hardening and tempering: putting the hot rolled steel processed in the step S2 into an annealing furnace for annealing at 740-780 ℃, putting the annealed steel into a vessel filled with mineral oil for cooling to normal temperature after the annealing is finished, then putting the cooled hot rolled steel into a quenching furnace for quenching treatment, wherein the temperature of quenching is 950-1200 ℃, after the quenching is finished, putting the hot rolled steel into a vessel filled with mineral oil again for cooling, reducing the temperature to 400-500 ℃, taking out the steel plate, putting the steel plate into another vessel, preparing brine with the concentration of 34-48%, spraying the brine onto the surface of hot rolled steel in a spraying mode, cooling the steel plate to normal temperature, putting the steel plate into a high-temperature tempering furnace for tempering at the temperature of 950-1200 ℃, and setting the cooling mode of the steel plate to be the same as the cooling mode of quenching after tempering;
s4, primary center hole repairing and grinding: clamping the hot rolled steel by using a three-jaw self-centering chuck, and then finishing a central hole in the hot rolled steel by using a central drill to ensure that the central holes at two ends of the hot rolled steel are positioned on the same axis, so that heat treatment deformation and oxide skin are eliminated;
s5, fine turning of the outer circle: step S4, after finishing the hot rolled steel center hole, turning the hot rolled steel with the outer circle turned by the lathe again, finish machining each outer circle, machining grooves and chamfers among the outer circles, then turning threads, after the threads are turned, marking a machining line of the key groove, and after the machining line is marked, turning the key groove by a milling cutter according to the position of the machining line;
s6, secondary center hole repairing and grinding: after finishing finish turning of the hot rolled steel in the step S5, finishing the center hole in the hot rolled steel again by the turning tool;
s7, grinding: in step S6, after finishing the secondary center finishing, polishing each excircle on the hot rolled steel by using a polisher until each excircle surface of the hot rolled steel is polished to a smooth position;
s8, checking: and in the processing process of the step S7, each excircle on the hot rolled steel is checked by a micrometer, and the size of the ground hot rolled steel is checked.
Preferably, in the step S1, the type of the hot rolled steel is 45 steel, and the size of the hot rolled steel is phi 55 × 255mm to phi 70 × 273 mm.
Preferably, in the step S2 and the step S5, the cutting margin of the rough turning outer circle is 0.4 to 0.7mm, and the cutting margin of the finish turning outer circle is 1.3 to 1.6 mm.
Preferably, in the step S3, the annealing heat preservation time is 20 to 25min, the quenching heat preservation time is 28 to 36min, and the tempering heat preservation time is 15 to 25 min.
Preferably, in step S3, when the hot rolled steel is cooled, the hot rolled steel is clamped by a clamp and is continuously turned in a vessel, so as to ensure sufficient cooling of the hot rolled steel.
Preferably, in the step S3, in the three cooling steps of annealing, quenching and tempering the hot-rolled steel, after the hot-rolled steel is cooled to normal temperature, the surface of the hot-rolled steel is sanded by sand paper, so as to remove dust and scale on the surface.
Preferably, in the steps S2 and S5 and S7, an electromagnetic plate is disposed below the hot-rolled steel to be processed, the electromagnetic plate has a size larger than the diameter of the hot-rolled steel, and when the hot-rolled steel is being processed, the electromagnetic plate is powered on to adsorb the cut steel scraps.
Preferably, in steps S7 and S8, the inspection and the grinding operation are performed simultaneously, the stepped shaft is inspected while grinding, and if the inspected dimension does not match the dimension on the drawing, the grinding operation is continued until the inspected dimension matches the dimension on the drawing.
Advantageous effects
The invention provides an automobile precision stepped shaft excircle grinding processing technology, which has the following beneficial effects compared with the prior art:
(1) the outer circle grinding processing technology of the precise stepped shaft of the automobile can improve the cutting processability by a method of carrying out annealing, quenching and tempering triple heat treatment on the stepped shaft; the residual stress is eliminated, the size is stabilized, and the deformation and crack tendency is reduced; the method has the advantages that crystal grains are refined, the structure is adjusted, the structure defects are eliminated, meanwhile, after quenching and tempering, under the cooling work of oil cooling and brine cooling, and each time of heat treatment, the surface of the stepped shaft is polished by abrasive paper, so that the surface of the stepped shaft can be smoother, the strength, the fatigue strength and the toughness of steel can be improved, and the quality of the processed stepped shaft is better.
(2) This car precision step shaft excircle abrasive machining technology is provided with an electromagnetic plate through the below at the hot rolled steel of processing, and the electromagnetic plate size is greater than the diameter of hot rolled steel, and when the hot rolled steel was at the in-process of processing, the power of switch-on electromagnetic plate can utilize the magnetism of electromagnetic plate, makes it adsorb the steel cuttings that the cutting got off, has played recycle's effect to the sweeps that the cutting got off, reduces extravagant phenomenon.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides three technical solutions:
example one
An outer circle grinding process for an automobile precision stepped shaft comprises the following steps:
s1, positioning reference: clamping the excircle of a hot rolled steel blank by using a three-jaw self-centering chuck, taking the excircle of the blank as a rough reference, machining an end face on the excircle of the blank, drilling a central hole by using a central drill, turning the excircle of one end of the central hole, then clamping the turned excircle by using the three-jaw self-centering chuck as a reference, machining the other end face of the excircle of the blank, and drilling another central hole to enable the central holes at two ends of the excircle of the blank to be positioned on the same horizontal shaft;
s2, roughly turning the outer circle: after the center hole of the excircle of the blank is machined, a tailstock center of a lathe is used for propping the center hole of the excircle of the blank, after propping, the lathe is used for roughly turning the surface of the excircle of the blank, and a step-shaped excircle is turned;
s3, hardening and tempering: putting the hot rolled steel processed in the step S2 into an annealing furnace for annealing at 740 ℃, putting the hot rolled steel into a vessel filled with mineral oil for cooling after annealing, cooling to normal temperature, putting the cooled hot rolled steel into a quenching furnace for quenching treatment, wherein the temperature of quenching is 950 ℃, putting the hot rolled steel into the vessel filled with mineral oil again for cooling after quenching is finished, reducing the temperature to 400 ℃, taking out the hot rolled steel and putting the hot rolled steel into another vessel, preparing brine with the concentration of 34 percent, spraying the brine onto the surface of the hot rolled steel in a spraying manner, cooling to normal temperature, putting the hot rolled steel into a high-temperature tempering furnace for tempering at 950 ℃, and setting the cooling manner of the hot rolled steel to be the same as the cooling manner of quenching after finishing quenching;
s4, primary center hole repairing and grinding: clamping the hot rolled steel by using a three-jaw self-centering chuck, and then finishing a central hole in the hot rolled steel by using a central drill to ensure that the central holes at two ends of the hot rolled steel are positioned on the same axis, so that heat treatment deformation and oxide skin are eliminated;
s5, fine turning of the outer circle: step S4, after finishing the hot rolled steel center hole, turning the hot rolled steel with the outer circle turned by the lathe again, finish machining each outer circle, machining grooves and chamfers among the outer circles, then turning threads, after the threads are turned, marking a machining line of the key groove, and after the machining line is marked, turning the key groove by a milling cutter according to the position of the machining line;
s6, secondary center hole repairing and grinding: after finishing finish turning of the hot rolled steel in the step S5, finishing the center hole in the hot rolled steel again by the turning tool;
s7, grinding: in step S6, after finishing the secondary center finishing, polishing each excircle on the hot rolled steel by using a polisher until each excircle surface of the hot rolled steel is polished to a smooth position;
s8, checking: and in the processing process of the step S7, each excircle on the hot rolled steel is checked by a micrometer, and the size of the ground hot rolled steel is checked.
Further, in step S1, the model of the hot rolled steel is 45 steel, and the size of the hot rolled steel is ∑ 55 × 255 mm.
Further, in the step S2 and the step S5, the cutting margin of the rough-turned outer circle is 0.4mm, and the cutting margin of the finish-turned outer circle is 1.3 mm.
Further, in the step S3, the annealing heat preservation time is 20min, the quenching heat preservation time is 28min, and the tempering heat preservation time is 15 min.
Further, in step S3, when the hot rolled steel is cooled, the hot rolled steel is clamped by a clamp and is continuously turned in a vessel, so as to ensure sufficient cooling of the hot rolled steel.
Further, in the step S3, in the three cooling steps of annealing, quenching and tempering the hot rolled steel, after the hot rolled steel is cooled to normal temperature, the surface of the hot rolled steel is polished by sand paper, and dust and scale on the surface are removed.
Further, in the steps S2 and S5 and S7, an electromagnetic plate is disposed below the hot-rolled steel to be processed, the electromagnetic plate has a size larger than the diameter of the hot-rolled steel, and when the hot-rolled steel is being processed, the electromagnetic plate is powered on to adsorb the cut steel scraps.
Further, in the above steps S7 and S8, the inspection and the grinding work are performed simultaneously, the stepped shaft is inspected while grinding, and if the inspected dimension does not match the dimension on the drawing, the grinding work is continued until the inspected dimension matches the dimension on the drawing.
Example two
An outer circle grinding process for an automobile precision stepped shaft comprises the following steps:
s1, positioning reference: clamping the excircle of a hot rolled steel blank by using a three-jaw self-centering chuck, taking the excircle of the blank as a rough reference, machining an end face on the excircle of the blank, drilling a central hole by using a central drill, turning the excircle of one end of the central hole, then clamping the turned excircle by using the three-jaw self-centering chuck as a reference, machining the other end face of the excircle of the blank, and drilling another central hole to enable the central holes at two ends of the excircle of the blank to be positioned on the same horizontal shaft;
s2, roughly turning the outer circle: after the center hole of the excircle of the blank is machined, a tailstock center of a lathe is used for propping the center hole of the excircle of the blank, after propping, the lathe is used for roughly turning the surface of the excircle of the blank, and a step-shaped excircle is turned;
s3, hardening and tempering: putting the hot rolled steel processed in the step S2 into an annealing furnace for annealing, wherein the annealing temperature is 780 ℃, after annealing, putting the hot rolled steel into a vessel filled with mineral oil for cooling, cooling to normal temperature, then putting the cooled hot rolled steel into a quenching furnace for quenching, wherein the quenching temperature is 1200 ℃, after quenching, putting the hot rolled steel into the vessel filled with mineral oil again for cooling, reducing the temperature to 500 ℃, then taking out the hot rolled steel, putting the hot rolled steel into another vessel, then preparing saline water with the concentration of 48%, spraying the saline water onto the surface of the hot rolled steel in a spraying manner, cooling to normal temperature, putting the hot rolled steel into a high-temperature tempering furnace for tempering, wherein the tempering temperature is 1200 ℃, and after quenching, setting the cooling manner of the hot rolled steel to be the same as the cooling manner of quenching;
s4, primary center hole repairing and grinding: clamping the hot rolled steel by using a three-jaw self-centering chuck, and then finishing a central hole in the hot rolled steel by using a central drill to ensure that the central holes at two ends of the hot rolled steel are positioned on the same axis, so that heat treatment deformation and oxide skin are eliminated;
s5, fine turning of the outer circle: step S4, after finishing the hot rolled steel center hole, turning the hot rolled steel with the outer circle turned by the lathe again, finish machining each outer circle, machining grooves and chamfers among the outer circles, then turning threads, after the threads are turned, marking a machining line of the key groove, and after the machining line is marked, turning the key groove by a milling cutter according to the position of the machining line;
s6, secondary center hole repairing and grinding: after finishing finish turning of the hot rolled steel in the step S5, finishing the center hole in the hot rolled steel again by the turning tool;
s7, grinding: in step S6, after finishing the secondary center finishing, polishing each excircle on the hot rolled steel by using a polisher until each excircle surface of the hot rolled steel is polished to a smooth position;
s8, checking: and in the processing process of the step S7, each excircle on the hot rolled steel is checked by a micrometer, and the size of the ground hot rolled steel is checked.
Further, in the step S1, the model of the hot rolled steel is 45 steel, and the size of the hot rolled steel is phi 70 × 273 mm.
Further, in the step S2 and the step S5, the cutting margin for rough turning of the outer circle is 0.7mm, and the cutting margin for finish turning of the outer circle is 1.6 mm.
Further, in the step S3, the annealing heat preservation time is 25min, the quenching heat preservation time is 36min, and the tempering heat preservation time is 25 min.
Further, in step S3, when the hot rolled steel is cooled, the hot rolled steel is clamped by a clamp and is continuously turned in a vessel, so as to ensure sufficient cooling of the hot rolled steel.
Further, in the step S3, in the three cooling steps of annealing, quenching and tempering the hot rolled steel, after the hot rolled steel is cooled to normal temperature, the surface of the hot rolled steel is polished by sand paper, and dust and scale on the surface are removed.
Further, in the steps S2 and S5 and S7, an electromagnetic plate is disposed below the hot-rolled steel to be processed, the electromagnetic plate has a size larger than the diameter of the hot-rolled steel, and when the hot-rolled steel is being processed, the electromagnetic plate is powered on to adsorb the cut steel scraps.
Further, in the above steps S7 and S8, the inspection and the grinding work are performed simultaneously, the stepped shaft is inspected while grinding, and if the inspected dimension does not match the dimension on the drawing, the grinding work is continued until the inspected dimension matches the dimension on the drawing.
EXAMPLE III
An outer circle grinding process for an automobile precision stepped shaft comprises the following steps:
s1, positioning reference: clamping the excircle of a hot rolled steel blank by using a three-jaw self-centering chuck, taking the excircle of the blank as a rough reference, machining an end face on the excircle of the blank, drilling a central hole by using a central drill, turning the excircle of one end of the central hole, then clamping the turned excircle by using the three-jaw self-centering chuck as a reference, machining the other end face of the excircle of the blank, and drilling another central hole to enable the central holes at two ends of the excircle of the blank to be positioned on the same horizontal shaft;
s2, roughly turning the outer circle: after the center hole of the excircle of the blank is machined, a tailstock center of a lathe is used for propping the center hole of the excircle of the blank, after propping, the lathe is used for roughly turning the surface of the excircle of the blank, and a step-shaped excircle is turned;
s3, hardening and tempering: putting the hot rolled steel processed in the step S2 into an annealing furnace for annealing, wherein the annealing temperature is 760 ℃, after annealing, putting the hot rolled steel into a vessel filled with mineral oil for cooling, cooling to normal temperature, then putting the cooled hot rolled steel into a quenching furnace for quenching, wherein the quenching temperature is 1100 ℃, after quenching, putting the hot rolled steel into the vessel filled with mineral oil again for cooling, reducing the temperature to 450 ℃, then taking out the hot rolled steel, putting the hot rolled steel into another vessel, then preparing brine with the concentration of 42%, spraying the brine onto the surface of the hot rolled steel in a spraying manner, cooling to normal temperature, then putting the hot rolled steel into a high-temperature tempering furnace for tempering, wherein the temperature is 1100 ℃, and after quenching, setting the cooling manner of the hot rolled steel to be the same as the cooling manner of quenching;
s4, primary center hole repairing and grinding: clamping the hot rolled steel by using a three-jaw self-centering chuck, and then finishing a central hole in the hot rolled steel by using a central drill to ensure that the central holes at two ends of the hot rolled steel are positioned on the same axis, so that heat treatment deformation and oxide skin are eliminated;
s5, fine turning of the outer circle: step S4, after finishing the hot rolled steel center hole, turning the hot rolled steel with the outer circle turned by the lathe again, finish machining each outer circle, machining grooves and chamfers among the outer circles, then turning threads, after the threads are turned, marking a machining line of the key groove, and after the machining line is marked, turning the key groove by a milling cutter according to the position of the machining line;
s6, secondary center hole repairing and grinding: after finishing finish turning of the hot rolled steel in the step S5, finishing the center hole in the hot rolled steel again by the turning tool;
s7, grinding: in step S6, after finishing the secondary center finishing, polishing each excircle on the hot rolled steel by using a polisher until each excircle surface of the hot rolled steel is polished to a smooth position;
s8, checking: and in the processing process of the step S7, each excircle on the hot rolled steel is checked by a micrometer, and the size of the ground hot rolled steel is checked.
Further, in the step S1, the model of the hot rolled steel is 45 steel, and the size of the hot rolled steel is ∑ 60 × 265 mm.
Further, in the step S2 and the step S5, the cutting margin for rough turning of the outer circle is 0.5mm, and the cutting margin for finish turning of the outer circle is 1.45 mm.
Further, in the step S3, the annealing heat preservation time is 23min, the quenching heat preservation time is 32min, and the tempering heat preservation time is 22 min.
Further, in step S3, when the hot rolled steel is cooled, the hot rolled steel is clamped by a clamp and is continuously turned in a vessel, so as to ensure sufficient cooling of the hot rolled steel.
Further, in the step S3, in the three cooling steps of annealing, quenching and tempering the hot rolled steel, after the hot rolled steel is cooled to normal temperature, the surface of the hot rolled steel is polished by sand paper, and dust and scale on the surface are removed.
Further, in the steps S2 and S5 and S7, an electromagnetic plate is disposed below the hot-rolled steel to be processed, the electromagnetic plate has a size larger than the diameter of the hot-rolled steel, and when the hot-rolled steel is being processed, the electromagnetic plate is powered on to adsorb the cut steel scraps.
Further, in the above steps S7 and S8, the inspection and the grinding work are performed simultaneously, the stepped shaft is inspected while grinding, and if the inspected dimension does not match the dimension on the drawing, the grinding work is continued until the inspected dimension matches the dimension on the drawing.
And those not described in detail in this specification are well within the skill of those in the art.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The outer circle grinding processing technology for the automobile precision stepped shaft is characterized by comprising the following steps of:
s1, positioning reference: clamping the excircle of a hot rolled steel blank by using a three-jaw self-centering chuck, taking the excircle of the blank as a rough reference, machining an end face on the excircle of the blank, drilling a central hole by using a central drill, turning the excircle of one end of the central hole, then clamping the turned excircle by using the three-jaw self-centering chuck as a reference, machining the other end face of the excircle of the blank, and drilling another central hole to enable the central holes at two ends of the excircle of the blank to be positioned on the same horizontal shaft;
s2, roughly turning the outer circle: after the center hole of the excircle of the blank is machined, a tailstock center of a lathe is used for propping the center hole of the excircle of the blank, after propping, the lathe is used for roughly turning the surface of the excircle of the blank, and a step-shaped excircle is turned;
s3, hardening and tempering: putting the hot rolled steel processed in the step S2 into an annealing furnace for annealing at 740-780 ℃, putting the annealed steel into a vessel filled with mineral oil for cooling to normal temperature after the annealing is finished, then putting the cooled hot rolled steel into a quenching furnace for quenching treatment, wherein the temperature of quenching is 950-1200 ℃, after the quenching is finished, putting the hot rolled steel into a vessel filled with mineral oil again for cooling, reducing the temperature to 400-500 ℃, taking out the steel plate, putting the steel plate into another vessel, preparing brine with the concentration of 34-48%, spraying the brine onto the surface of hot rolled steel in a spraying mode, cooling the steel plate to normal temperature, putting the steel plate into a high-temperature tempering furnace for tempering at the temperature of 950-1200 ℃, and setting the cooling mode of the steel plate to be the same as the cooling mode of quenching after tempering;
s4, primary center hole repairing and grinding: clamping the hot rolled steel by using a three-jaw self-centering chuck, and then finishing a central hole in the hot rolled steel by using a central drill to ensure that the central holes at two ends of the hot rolled steel are positioned on the same axis, so that heat treatment deformation and oxide skin are eliminated;
s5, fine turning of the outer circle: step S4, after finishing the hot rolled steel center hole, turning the hot rolled steel with the outer circle turned by the lathe again, finish machining each outer circle, machining grooves and chamfers among the outer circles, then turning threads, after the threads are turned, marking a machining line of the key groove, and after the machining line is marked, turning the key groove by a milling cutter according to the position of the machining line;
s6, secondary center hole repairing and grinding: after finishing finish turning of the hot rolled steel in the step S5, finishing the center hole in the hot rolled steel again by the turning tool;
s7, grinding: in step S6, after finishing the secondary center finishing, polishing each excircle on the hot rolled steel by using a polisher until each excircle surface of the hot rolled steel is polished to a smooth position;
s8, checking: and in the processing process of the step S7, each excircle on the hot rolled steel is checked by a micrometer, and the size of the ground hot rolled steel is checked.
2. The cylindrical grinding process for the precise stepped shaft of the automobile according to claim 1, which is characterized in that: in the step S1, the type of the hot rolled steel is 45 steel, and the size of the hot rolled steel is phi 55 multiplied by 255mm to phi 70 multiplied by 273 mm.
3. The cylindrical grinding process for the precise stepped shaft of the automobile according to claim 1, which is characterized in that: in the step S2 and the step S5, the cutting allowance of the rough turning outer circle is 0.4-0.7 mm, and the cutting allowance of the fine turning outer circle is 1.3-1.6 mm.
4. The cylindrical grinding process for the precise stepped shaft of the automobile according to claim 1, which is characterized in that: in the step S3, the annealing heat preservation time is 20-25 min, the quenching heat preservation time is 28-36 min, and the tempering heat preservation time is 15-25 min.
5. The cylindrical grinding process for the precise stepped shaft of the automobile according to claim 4, characterized in that: in step S3, when the hot rolled steel is cooled, the hot rolled steel is clamped by the clamp and is continuously turned over in the vessel, so as to ensure sufficient cooling of the hot rolled steel.
6. The cylindrical grinding process for the precise stepped shaft of the automobile according to claim 4, characterized in that: in the step S3, in the three cooling steps of annealing, quenching and tempering the hot rolled steel, after the hot rolled steel is cooled to normal temperature, the surface of the hot rolled steel is polished by sand paper, and dust and scale on the surface are removed.
7. The cylindrical grinding process for the precise stepped shaft of the automobile according to claim 1, which is characterized in that: in the steps S2 and S5 and S7, an electromagnetic plate is disposed below the hot rolled steel to be processed, the electromagnetic plate has a size larger than the diameter of the hot rolled steel, and when the hot rolled steel is being processed, the electromagnetic plate is powered on to adsorb the cut steel scraps.
8. The cylindrical grinding process for the precise stepped shaft of the automobile according to claim 1, which is characterized in that: in the above steps S7 and S8, the inspection and the grinding work are performed simultaneously, the stepped shaft is inspected while grinding, and if the inspected dimension does not match the dimension on the drawing, the grinding work is continued until the inspected dimension matches the dimension on the drawing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113752082A (en) * | 2021-09-17 | 2021-12-07 | 苏州鼎隆精密机械制造有限公司 | Production process of precise concentric shaft |
| CN115246062A (en) * | 2022-07-14 | 2022-10-28 | 浙江米皇新材股份有限公司 | Novel low-loss production process for automobile battery aluminum-clad section positioning pin |
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|---|---|---|---|---|
| CN113752082A (en) * | 2021-09-17 | 2021-12-07 | 苏州鼎隆精密机械制造有限公司 | Production process of precise concentric shaft |
| CN113752082B (en) * | 2021-09-17 | 2023-12-12 | 苏州鼎隆精密机械制造有限公司 | Production process of precise concentric shaft |
| CN115246062A (en) * | 2022-07-14 | 2022-10-28 | 浙江米皇新材股份有限公司 | Novel low-loss production process for automobile battery aluminum-clad section positioning pin |
| CN115246062B (en) * | 2022-07-14 | 2023-11-03 | 浙江米皇新材股份有限公司 | Novel low-loss production process for aluminum-clad profile positioning pin of automobile battery |
| CN115255838A (en) * | 2022-08-23 | 2022-11-01 | 宜昌船舶柴油机有限公司 | Manufacturing process and method of threading and rolling thread rolling wheel |
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