CN112792515A - Shaft core processing technology - Google Patents
Shaft core processing technology Download PDFInfo
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- CN112792515A CN112792515A CN202110105520.9A CN202110105520A CN112792515A CN 112792515 A CN112792515 A CN 112792515A CN 202110105520 A CN202110105520 A CN 202110105520A CN 112792515 A CN112792515 A CN 112792515A
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Abstract
The application relates to a shaft core processing technology, which comprises the following steps: s1: blanking, namely blanking by using a laser cutting machine; s2: quenching and tempering heat treatment to ensure that the hardness of the blank meets 45 HRC-50 HRC; s3: straightening by a machine to enable the circular runout of the blank finished in the step S2 to be within 0.03 mm; s4: coarse grinding, namely performing coarse grinding processing on the blank by using a cylindrical grinding machine to enable the outer diameter of the blank to be 8mm and the circular runout to be within 0.02 mm; s5: turning, namely performing semi-finish turning on the blank by using a numerical control lathe; s6: thread rolling, namely performing straight-line processing on the blank by using a thread rolling machine; s7: drilling, namely axially drilling holes on the blank by using a drilling machine to drill a water injection hole with the hole diameter of 3 mm; s8: quenching, namely quenching the blank by using a tempering furnace; s9: cylindrical grinding, wherein each section of the blank is finely ground by a cylindrical grinding machine; s10: surface passivation treatment; s11: and (5) inspecting a finished product. The method has the effects of improving the overall stability of the shaft core, reducing the internal stress and reducing the brittleness.
Description
Technical Field
The application relates to the field of shaft machining, in particular to a shaft core machining process.
Background
The dish washer is used to automatically clean tableware such as dish, chopsticks, dish, knife and fork.
In the related technology, the impeller type dish washing machine is one of dish washing machines, mainly comprises an impeller and a motor, and has the working principle that impeller blades are driven to rotate at a high speed, washing liquid is thrown up to the upper part at a high speed and splashed, and tableware is continuously and repeatedly washed, so that the purpose of cleaning tableware dirt is achieved. Before cleaning, the tableware is required to be placed on the dish rack neatly, the cabinet door is closed, and the time is adjusted to start the washing machine.
The shaft core is used as a transmission structure between the motor and the impeller, and needs to have certain structural strength, so that the condition of fracture is avoided.
Disclosure of Invention
In order to improve the structural strength of the shaft core, the application provides a shaft core processing technology.
The application provides a shaft core processing technology, adopts following technical scheme:
a shaft core processing technology comprises the following steps:
s1: blanking, namely blanking by using a laser cutting machine;
s2: quenching and tempering heat treatment to ensure that the hardness of the blank meets 45 HRC-50 HRC;
s3: straightening by a machine to enable the circular runout of the blank finished in the step S2 to be within 0.03 mm;
s4: coarse grinding, namely performing coarse grinding processing on the blank by using a cylindrical grinding machine to enable the outer diameter of the blank to be 8mm and the circular runout to be within 0.02 mm;
s5: turning, namely performing semi-finish turning on the blank by using a numerical control lathe;
s6: thread rolling, namely performing straight-line processing on the blank by using a thread rolling machine;
s7: drilling, namely axially drilling holes on the blank by using a drilling machine to drill a water injection hole with the hole diameter of 3 mm;
s8: quenching, namely quenching the blank by using a tempering furnace;
s9: cylindrical grinding, wherein each section of the blank is finely ground by a cylindrical grinding machine;
s10: surface passivation treatment;
s11: and (5) inspecting a finished product.
By adopting the technical scheme, the laser cutting device is high in laser cutting precision, high in speed, small in heat affected zone and not easy to deform. The cutting is smooth and beautiful, and the subsequent treatment is not needed. The hardness of the finished product meets 45 HRC-50 HRC, and the surface hardness is enhanced through quenching, so that the integral structural strength of the shaft core meets the structural strength required by use.
Optionally, the turning specifically comprises the following steps:
s51: milling a tool withdrawal groove by using a milling machine;
s52: turning a step on the blank by using a lathe;
s53: cutting a second section by using a double-wheel cutting knurling tool to cut reticulate knurling lines;
s54: turning a thread groove by using a milling machine;
s55: and milling flatly, namely milling flatly by using a numerical control milling machine to process a flat groove.
By adopting the technical scheme, the tool withdrawal groove is arranged, so that the tool can be conveniently withdrawn and the process can be processed to the bottom of the blank. The step functions to facilitate positioning of the mounting shaft. Turning to make the blank have the shape of the finished product.
Optionally, the quenching comprises the following specific steps:
s81: filling slurry into the water injection hole;
s82: putting the blank into a tempering furnace for quenching;
s83: taking the blank out of the tempering furnace and performing water quenching;
s84: putting the blank into a tempering furnace for tempering;
s85: taking the blank out of the tempering furnace and performing water quenching;
s86: and (5) poking out soil in the water injection hole and cleaning the soil.
By adopting the technical scheme and quenching in the tempering furnace, the occurrence of workpiece abrasion can be reduced, the workpiece hardness is increased, the wear resistance of a finished product is improved, and the probability of cracks possibly caused by rapid heating is reduced. As the slurry is filled in the water injection holes, the temperature of the part of the blank close to the water injection holes is slowly increased relative to the outer side of the blank in the quenching and tempering processes, so that the inner side of the water injection holes has toughness relative to the outer side of the blank, and the problem of poor dynamic load resistance caused by consistent integral brittleness of the blank is solved.
Optionally, the quenching temperature is 550-580 ℃, and the tempering temperature is 200-250 ℃.
By adopting the technical scheme, the surface hardness of the blank is improved by quenching, the overall stability of the blank is improved by tempering, the internal stress is reduced, and the brittleness is reduced.
Optionally, the external grinding comprises the following specific steps:
s91: grinding the excircle of the first section to ensure that the diameter of the first section is 7.94 mm;
s92: grinding the excircle of the third section to ensure that the diameter of the third section is 7.94 mm;
s93: grinding the excircle of the fourth section to make the diameter of the fourth section be 6.0 mm;
s94: and grinding the outer circle of the fifth section to ensure that the diameter of the fifth section is 5.8 mm.
By adopting the technical scheme, the outer surface of each section of the blank is ground into the required diameter, and different positions are ground among the steps, so that the sequence of the steps S91-S94 can be adjusted.
Optionally, the surface passivation treatment specifically comprises the following steps:
s101: oil and rust removal is needed before the finished product is processed;
s102: washing the degreaser with water for 1-3 min with common tap water;
s103: pickling the passivation solution, and soaking the stock solution at normal temperature for 5-10 min;
s104: rinsing the passivation solution remained on the surface of the finished product by water, and flowing tap water for 1-3 min;
s105: neutralizing with 5% caustic soda flakes and surface passivation solution of the blank finished product for 5 min;
s106: rinsing the passivation solution remained on the surface of the finished product by water, and flowing tap water for 1-3 min;
s107: removing impurities and water marks by using purified water for 1-3 min;
s108: oven drying or air drying at a temperature below 180 deg.C.
By adopting the technical scheme, the finished product needs to be subjected to oil removal and rust removal before being processed, and the finished product needs to be subjected to oil removal and rust removal after being subjected to oil removal, because if the finished product is not subjected to oil removal and rust removal firstly, oil stains are possibly generated on the surface, and the rust removal liquid cannot wet the surface, so that the rust removal is not thorough; secondly, if rust removal is carried out before oil removal, heating is often needed for oil removal. At higher temperatures, the workpieces that have been descaled may be re-oxidized. Therefore, oil removal is performed before rust removal. The passivating agent can generate a protective film on the surface of the finished product to slow down corrosion.
Optionally, the finished product inspection specifically comprises the following steps:
s111: and (4) taking a small amount of sample from the finished product, putting the sample into a salt spray test box, and spraying for 72 hours.
By adopting the technical scheme, the corrosion resistance of the finished product is tested through the salt spray test detection. The 72h spray time is more critical than a conventional 24h spray and is more critical to durability considerations for the finished product.
Optionally, the finished product is placed in a neutral salt spray experiment box for not less than 24 hours at room temperature before being tested for corrosion resistance.
By adopting the technical scheme, the surface of the finished product can be contacted with air for a period of time in a natural environment, so that the test environment is closer to a real use scene.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the hardness of the finished product meets 45 HRC-50 HRC, and the surface hardness is enhanced through quenching, so that the integral structural strength of the shaft core meets the structural strength required by use;
2. as the slurry is filled in the water injection hole, the temperature of the part of the blank close to the water injection hole is slowly increased in the quenching and tempering processes, and the blank has toughness relative to the outer side of the blank, so that the problem of poor dynamic load resistance caused by the consistent brittleness of the whole blank is solved.
Drawings
FIG. 1 is a block diagram of a spindle machining process of the present application;
fig. 2 is a schematic view of the structure of the shaft core of the present application.
Description of reference numerals: 1. a first stage; 2. a second stage; 3. a third stage; 4. a fourth stage; 5. a fifth stage; 6. a tool withdrawal groove; 7. reticulate pattern knurling lines; 8. flattening the groove; 9. and (7) water injection holes.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a shaft core processing technology. Referring to fig. 1, the shaft core processing technology comprises the following steps:
s1: and (5) blanking, namely blanking by using a laser cutting machine.
In step S1, the material to be cut is irradiated by the high power density laser beam, so that the material is heated to the vaporization temperature quickly, and is vaporized to form a hole, and the hole continuously forms a slit with a narrow width as the material moves by the beam, thereby completing the cutting of the material.
S2: quenching and tempering heat treatment to ensure that the hardness of the blank meets 45 HRC-50 HRC.
In step S2, the hardening and tempering can adjust the properties and materials of the steel to a great extent, and the steel has good strength, plasticity and toughness and good comprehensive mechanical properties. And if the hardness of the blank is required to meet 45 HRC-50 HRC, the heating temperature of the furnace is required to be 560-600 ℃.
S3: and (4) straightening the machine to enable the circular runout of the blank finished in the step S2 to be within 0.03 mm.
In step S3, after the blank is subjected to heat treatment, the blank is deformed under the combined action of thermal stress and structural stress, and the design requirements of the process can be met only by proper alignment. Because the hardness of the blank is 45 HRC-50 HRC, a cold-state knock-back straightening method is adopted in the application. The concave position of the deformation part is continuously knocked by a high-hardness hand hammer to generate small-area plastic deformation, and the concave surface is extended to correct the deformation.
S4: and (4) coarse grinding, namely performing coarse grinding processing on the blank by using a cylindrical grinding machine to enable the outer diameter of the blank to be 8mm and the circular runout to be within 0.02 mm.
S5: turning, namely performing semi-finish turning on the blank by using a numerical control lathe.
In step S4 and step S5, the blank is first rough-ground to make the outer diameter of the blank meet the design requirement and further improve the circular run-out of the blank. The finish turning can improve the roughness of the surface of the blank and improve the precision of the blank.
Wherein, the turning concrete steps are as follows: s51: milling the tool withdrawal groove 6 by a milling machine. S52: and (5) turning a step on the blank by using a lathe. S53: and cutting a reticulate pattern knurling line 7 on the second section 2 by using a double-wheel cutting knurling tool. S54: and turning a thread groove by using a milling machine. S55: and milling flatly, namely milling flatly by using a numerical control milling machine to process a flat groove 8.
S6: and (4) rolling threads, namely performing straight thread processing on the blank by using a thread rolling machine.
In step S6, the blank may also be straight-threaded by using a thread rolling machine, but because the blank is smaller, the thread rolling machine is more suitable for a workpiece with a large length, and in order to make the machining more flexible and efficient, the thread rolling machine is used to perform straight-threaded machining on the blank in the present application.
S7: and (4) drilling, namely axially drilling holes on the blank by using a drilling machine, and drilling water injection holes 9 with the hole diameter of 3 mm.
In step 7, since the water injection holes 9 directly penetrate through the whole blank, for example, the water injection holes 9 are directly machined at one end of the blank by a drilling machine, the blank may be broken during the drilling process by a drill, so that the two-way drilling is adopted during the drilling, and after one half of the water injection holes 9 are drilled at one end of the blank, the other end of the blank is drilled until the water injection holes 9 are communicated.
S8: quenching, and quenching the blank by using a tempering furnace.
Wherein, the quenching comprises the following specific steps:
s81: the water injection hole 9 is filled with slurry.
Wherein the Weibo consistency of the slurry is controlled between 5S and 10S, so that the slurry is convenient to fill into the water injection holes 9 and does not flow out of the water injection holes 9 when the blank is put into the tempering furnace. The main component of the slurry is soil, and after the slurry is dried in a tempering furnace, the dried soil is easy to clean holes.
S82: putting the blank into a tempering furnace for quenching;
s83: taking the blank out of the tempering furnace and performing water quenching;
s84: putting the blank into a tempering furnace for tempering;
s85: taking the blank out of the tempering furnace and performing water quenching;
in steps S82 to S85, the quenching temperature is 550 ℃ to 580 ℃, and the tempering temperature is 200 ℃ to 250 ℃. Quenching improves the surface hardness of the blank, tempering improves the overall stability of the blank, reduces the internal stress and reduces the brittleness. By adopting the tempering furnace for quenching, the occurrence of workpiece abrasion can be reduced, the workpiece hardness is increased, the finished product wear resistance is improved, and the probability of cracks possibly caused by rapid heating is reduced. As the slurry is filled in the water injection holes 9, in the quenching and tempering processes, the temperature of the part of the blank close to the water injection holes is slowly increased, and the blank has toughness relative to the outer side of the blank, so that the problem of poor dynamic load resistance caused by the consistent brittleness of the whole blank is solved. In some embodiments, the slurry may be processed into a rod-shaped mud bar, and the mud bar is inserted into the water injection hole 9, which is more convenient and efficient than injecting the slurry into the water injection hole 9, but because the water content of the mud bar is lower, the temperature rises faster, and the toughness of the side of the water injection hole 9 is not as high as that of the blank injected with the slurry.
S86: and (5) poking out the soil in the water injection hole 9 and cleaning the soil.
In step S86, when cleaning the water injection hole 9, the stick body with a diameter smaller than the diameter of the water injection hole 9 and a length larger than the length of the water injection hole 9 is used to stick out the burnt-out soil in the water injection hole 9, and then the water gun is used to flush the water injection hole 9 for about 1 minute to clean the water injection hole completely.
S9: and (5) cylindrical grinding, wherein the cylindrical grinding machine is used for carrying out fine grinding on each section of the blank.
Wherein, the concrete step of cylindrical grinding is: s91: grinding the excircle of the first section 1 to ensure that the diameter of the first section 1 is 7.94 mm; s92: grinding the excircle of the third section 3 to ensure that the diameter of the third section 3 is 7.94 mm; s93: grinding the excircle of the fourth section 4 to make the diameter of the fourth section 4 be 6.0 mm; s94: the fifth section 5 is ground to an outer circle so that the diameter of the fifth section 5 is 5.8 mm. The sequence of steps S91-S94 can be randomly changed. When the outer rounding is carried out, in order to avoid thermal deformation of the blank, water needs to be injected at the contact part of the grinding wheel and the blank so as to reduce the temperature during processing.
S10: and (5) surface passivation treatment.
The surface passivation treatment comprises the following specific steps:
s101: oil and rust removal is needed before the finished product is processed;
step S101 needs to be executed strictly in the order of removing oil first and then removing rust, because if the rust is removed first without removing oil, the surface may be greasy, and the rust removing liquid cannot wet the surface, so that the rust removal is incomplete; secondly, if rust removal is carried out before oil removal, heating is often needed for oil removal. At higher temperatures, the workpieces that have been descaled may be re-oxidized. Therefore, oil removal is performed before rust removal.
S102: washing the degreaser with water for 1-3 min with common tap water;
s103: pickling the passivation solution, and soaking the stock solution at normal temperature for 5-10 min; s104: rinsing the passivation solution remained on the surface of the finished product by water, and flowing tap water for 1-3 min; s105: neutralizing with 5% caustic soda flakes and surface passivation solution of the blank finished product for 5 min; s106: rinsing the passivation solution remained on the surface of the finished product by water, and flowing tap water for 1-3 min; s107: removing impurities and water marks by using purified water for 1-3 min; s108: oven drying or air drying at a temperature below 180 deg.C.
S11: and (5) inspecting a finished product.
The method comprises the following steps of:
s111: and (4) taking a small amount of sample from the finished product, putting the sample into a salt spray test box, and spraying for 72 hours.
In step S111, the salt spray test is generally performed for only 24 hours, but the spraying time is extended to 72 hours to check the durability of the product due to the severities of the quality requirements of the product.
In the present application, the experimental environment is closer to the actual use case. And placing the finished product in a neutral salt spray experiment box for detecting the corrosion resistance of the finished product, wherein the finished product needs to be placed at room temperature for not less than 24 hours.
The implementation principle of the shaft core processing technology in the embodiment of the application is as follows: in the quenching process, because the slurry is filled in the water injection holes 9, in the quenching and tempering processes, the temperature of the part of the blank close to the water injection holes 9 is slowly increased, and the blank has toughness relative to the outer side of the blank, so that the problem of poor dynamic load resistance caused by consistent integral brittleness of the blank is solved. The technology of quenching and tempering by adopting a tempering furnace improves the surface hardness of the blank, improves the integral stability of the blank, reduces the internal stress and reduces the brittleness. Finally, the performance of the shaft core for resisting shaft breakage is improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The shaft core processing technology is characterized by comprising the following steps:
s1: blanking, namely blanking by using a laser cutting machine;
s2: quenching and tempering heat treatment to ensure that the hardness of the blank meets 45 HRC-50 HRC;
s3: straightening by a machine to enable the circular runout of the blank finished in the step S2 to be within 0.03 mm;
s4: coarse grinding, namely performing coarse grinding processing on the blank by using a cylindrical grinding machine to enable the outer diameter of the blank to be 8mm and the circular runout to be within 0.02 mm;
s5: turning, namely performing semi-finish turning on the blank by using a numerical control lathe;
s6: thread rolling, namely performing straight-line processing on the blank by using a thread rolling machine;
s7: drilling, namely axially drilling holes on the blank by using a drilling machine to drill a water injection hole (9) with the hole diameter of 3 mm;
s8: quenching, namely quenching the blank by using a tempering furnace;
s9: cylindrical grinding, wherein each section of the blank is finely ground by a cylindrical grinding machine;
s10: surface passivation treatment;
s11: and (5) inspecting a finished product.
2. The shaft core machining process according to claim 1, characterized in that the turning comprises the following specific steps:
s51: milling a tool withdrawal groove (6) by using a milling machine;
s52: turning a step on the blank by using a lathe;
s53: cutting a reticulate pattern knurling line (7) on the second section (2) by using a double-wheel cutting knurling tool;
s54: turning a thread groove by using a milling machine;
s55: and (5) milling flatly, namely milling flatly by using a numerical control milling machine to process a flat groove (8).
3. The shaft core processing technology according to claim 1, wherein the quenching comprises the following specific steps:
s81: filling slurry into the water injection hole (9);
s82: putting the blank into a tempering furnace for quenching;
s83: taking the blank out of the tempering furnace and performing water quenching;
s84: putting the blank into a tempering furnace for tempering;
s85: taking the blank out of the tempering furnace and performing water quenching;
s86: and (4) poking out soil in the water injection hole (9) and cleaning.
4. The shaft core processing technology according to claim 3, wherein the quenching temperature is 550-580 ℃ and the tempering temperature is 200-250 ℃.
5. The shaft core processing technology according to claim 1, wherein the external cylindrical grinding comprises the following specific steps:
s91: grinding the excircle of the first section (1) to ensure that the diameter of the first section (1) is 7.94 mm;
s92: grinding the excircle of the third section (3) to ensure that the diameter of the third section (3) is 7.94 mm;
s93: grinding the excircle of the fourth section (4) to make the diameter of the fourth section (4) 6.0 mm;
s94: and (3) grinding the outer circle of the fifth section (5) to ensure that the diameter of the fifth section (5) is 5.8 mm.
6. The shaft core processing technology according to claim 1, wherein the surface passivation treatment comprises the following specific steps:
s101: oil and rust removal is needed before the finished product is processed;
s102: washing the degreaser with water for 1-3 min with common tap water;
s103: pickling the passivation solution, and soaking the stock solution at normal temperature for 5-10 min;
s104: rinsing the passivation solution remained on the surface of the finished product by water, and flowing tap water for 1-3 min;
s105: neutralizing with 5% caustic soda flakes and surface passivation solution of the blank finished product for 5 min;
s106: rinsing the passivation solution remained on the surface of the finished product by water, and flowing tap water for 1-3 min;
s107: removing impurities and water marks by using purified water for 1-3 min;
s108: oven drying or air drying at a temperature below 180 deg.C.
7. The shaft core processing technology as claimed in claim 1, wherein the finished product inspection comprises the following specific steps:
s111: and (4) taking a small amount of sample from the finished product, putting the sample into a salt spray test box, and spraying for 72 hours.
8. The process of claim 1, wherein the finished product is allowed to stand at room temperature for not less than 24 hours before being placed in a neutral salt spray laboratory to test the corrosion resistance of the finished product.
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| CN113098208A (en) * | 2021-05-17 | 2021-07-09 | 犍为安兴机械有限公司 | Improved assembling and processing device for rotor shaft of three-phase asynchronous motor and processing technology thereof |
| CN114734206A (en) * | 2022-04-13 | 2022-07-12 | 浙江骏马弹簧制造有限公司 | Machining process of hot-rolling spring mandrel |
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