CN113601120B - Machining method for electric spindle pull rod of automatic loosening broach - Google Patents
Machining method for electric spindle pull rod of automatic loosening broach Download PDFInfo
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- CN113601120B CN113601120B CN202110934535.6A CN202110934535A CN113601120B CN 113601120 B CN113601120 B CN 113601120B CN 202110934535 A CN202110934535 A CN 202110934535A CN 113601120 B CN113601120 B CN 113601120B
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- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a method for machining an automatic loosening broach electric spindle pull rod, which belongs to the technical field of machining and comprises the steps of blanking, drilling, rough turning of an outer circle, reaming, hole turning, thread turning, heat treatment, hole grinding, rough grinding of an outer shape, electric hexagon, milling of the outer shape, stabilizing treatment and the like. According to the method for machining the electric spindle pull rod of the automatic loosening broach, a machining method of the lengthened deep hole drill is adopted to ensure concentricity of the pull rod, 3Cr13 is used as the material of the pull rod, the stability of the pull rod production is improved by a cooling treatment process after rough machining heat treatment and a secondary stabilizing treatment process after rough grinding, and the bending deformation of the pull rod is prevented.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a machining method for an electric spindle pull rod of an automatic loosening broach.
Background
The automatic loosening broach electric spindle is a product with high technical content, the development time of the automatic loosening broach in China is short, and manufacturers for producing the automatic loosening broach electric spindle in China are few. The manufacture of an electric spindle of an automatic loose broach mainly relates to the problem of a processing method of parts. Because the electric spindle is slender in appearance and the internal part pull rod is slender in shape, the conditions of bending deformation and unqualified precision are easy to occur in the machining process.
Disclosure of Invention
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a processing method of automatic pine broach electricity main shaft pull rod, includes the pull rod, the pull rod is cylindrical, and the pull rod from left to right includes first excircle shelves, second excircle shelves, third excircle shelves, fourth excircle shelves, fifth excircle shelves and sixth excircle shelves in proper order, the central point of pull rod puts and is provided with the through-hole, and the both ends of through-hole are provided with first reaming and second reaming, be provided with the internal thread in the first reaming, and first reaming outer end is provided with emery wheel overrun groove, emery wheel overrun groove's outer end is provided with the hole, and the outer end of hole is provided with first centre bore, be provided with hexagonal hole in the second reaming, and second reaming outer end is provided with second centre bore, its characterized in that: the processing method of the pull rod comprises the following steps:
s1, blanking: clamping and positioning the outer circle, and turning a flat end face;
s2, drilling: drilling a through hole on the flat end surface of the lathe by using a deep hole drill;
s3, roughly turning the outer circle: roughly turning a first excircle baffle, a second excircle baffle, a third excircle baffle, a fourth excircle baffle, a fifth excircle baffle and a sixth excircle baffle according to the allowance required by the process drawing;
s4, reaming: reaming two ends of the through hole by using a drill bit according to the drawing size, and forming a first reaming hole and a second reaming hole after reaming;
s5, hole turning: turning a first center hole and a second center hole at two ends according to the drawing size, turning an inner hole according to the drawing size, and turning a grinding wheel overtravel groove;
s6, threading: turning internal threads in the first counterbored hole according to the drawing size;
s7, heat treatment: quenching the whole pull rod to ensure HRC48-52, and performing primary stabilization treatment by ice-cooling treatment;
s8, hole grinding: grinding the first central hole and the second central hole according to the requirements of a process drawing;
s9, rough grinding profile: grinding the first outer circle gear, the third outer circle gear and the fifth outer circle gear of the pull rod, and grinding the inner hole;
s10, electric hexagon: electrically hexagonally machining the second hole enlargement according to the structure of the drawing to form a hexagonal hole;
s11, milling the shape: milling the second outer circular file according to the drawing size;
s12, stabilizing: placing the pull rod in a container, heating to 150-160 ℃, preserving heat for 8 hours, and carrying out secondary stabilization treatment;
s13, grinding: grinding the first central hole and the second central hole at two ends according to the requirements of a process drawing, and grinding an inner hole at the same time;
s14, fine grinding: and finely grinding the first outer circle gear, the third outer circle gear and the fifth outer circle gear according to the requirements of a process drawing.
S15, grinding threads: and grinding the internal thread.
Preferably, after step S15 is completed, the method further includes the following steps: and (4) blowing and washing each machined surface of the machined pull rod by using high-pressure air, and removing scrap iron and grinding wheel ash of each machined surface.
Preferably, after the washing step is completed, the method further comprises the following steps of: and (5) inspecting that the overall size, the roughness and the surface hardness of each processing surface of the product meet the requirements, and oiling, packaging and warehousing the product.
Preferably, the material adopted by the pull rod is 3Cr 13.
Preferably, when the through hole is drilled in the step S2, the rotation speed of the cutter is 800r/min to 1200r/min, and the drilling speed of the cutter is 200 mm/min to 250 mm/min.
Preferably, when the outer circle of the tool is rough in the step S3, the cutting speed of the tool is 450 to 550m/min, and the feed rate is 0.2 to 0.3 mm/r.
Preferably, when the center hole is turned in the step S5, the cutting speed of the cutter is 100-200 m/min, and the feed rate of the cutter is 0.15-0.25 mm/r.
Preferably, the quenching temperature of the heat treatment in the step S7 is 850 to 960 ℃, the temperature is rapidly cooled to below 200 ℃ at a low temperature, and then the temperature is naturally cooled to normal temperature.
Preferably, in the step S7, the ice-cooling treatment is performed by freezing the tie rod immediately after quenching in an ice-cooling treatment tank, the tie rod is taken out after the holding time is up to 90 ℃ and naturally warmed in air for 1 hour, and then the tie rod is tempered in a tempering furnace at 170 ℃ for 4 hours.
The technical scheme provided by the invention has the beneficial effects that:
according to the processing method of the automatic loosening and pulling tool electric spindle pull rod, the pull rod of the automatic loosening and pulling tool electric spindle is a hollow and slender part, and the concentricity is guaranteed by adopting a processing method of a lengthened deep hole drill in order to guarantee the concentricity of the pull rod. 3Cr13 is used as a material of the pull rod, the pull rod is easy to bend and deform in processing, the stability of the pull rod production is improved by a cooling treatment process after rough processing heat treatment and a secondary stabilizing treatment process after rough grinding, the bending deformation of the pull rod is prevented, the pull rod is easy to deform after heat treatment, a special grinding machine is used for grinding a central hole, the high precision of the central hole is ensured, the precision of the central hole is ensured by a secondary fine center hole trimming process due to the deformation of the central hole after electric hexagon, the precision and the technical requirements of the pull rod of the electric spindle of the automatic broaching tool are ensured by the processing method, and the production requirements of the electric spindle of the automatic broaching tool at the current stage are met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for processing a pull rod according to the present invention;
FIG. 2 is a schematic view of the structure of the tie rod of the present invention;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
fig. 4 is an enlarged schematic view of B in fig. 2.
In the figure: 1. a first outer circular baffle; 2. a second outer circular gear; 3. a third outer circular baffle; 4. a fourth outer circular gear; 5. a fifth outer circular baffle; 6. a sixth outer circular baffle; 7. a first central aperture; 8. an inner bore; 9. a grinding wheel overrun groove; 10. an internal thread; 11. first reaming; 12. a through hole; 13. second reaming; 14. a hexagonal hole; 15. a second central aperture.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
In the following description, for clarity and conciseness of description, not all of the various components shown in the figures have been described. The various components shown in the figures provide those skilled in the art with a fully enabled disclosure of the invention. The operation of many of the components is familiar and obvious to those skilled in the art.
Example (b):
as shown in fig. 1-4, this embodiment provides a method for processing an automatic loose broach electric spindle pull rod, including a pull rod, the pull rod is cylindrical, and the pull rod sequentially includes, from left to right, a first outer circle gear 1, a second outer circle gear 2, a third outer circle gear 3, a fourth outer circle gear 4, a fifth outer circle gear 5 and a sixth outer circle gear 6, a through hole 12 is provided at a central position of the pull rod, and both ends of the through hole 12 are provided with a first reaming 11 and a second reaming 13, an internal thread 10 is provided in the first reaming 11, and an outer end of the first reaming 11 is provided with a grinding wheel overrun groove 9, an outer end of the grinding wheel overrun groove 9 is provided with an inner hole 8, and an outer end of the inner hole 8 is provided with a first center hole 7, a hexagonal hole 14 is provided in the second reaming 13, and an outer end of the second reaming 13 is provided with a second center hole 15, which is characterized in that: the processing method of the pull rod comprises the following steps:
s1, blanking: clamping and positioning the outer circle, and flattening the end face;
s2, drilling: drilling a through hole 12 on the flat end surface of the lathe by using a deep hole drill;
s3, roughly turning the outer circle: roughly turning a first excircle baffle 1, a second excircle baffle 2, a third excircle baffle 3, a fourth excircle baffle 4, a fifth excircle baffle 5 and a sixth excircle baffle 6 according to the allowance required by a process drawing;
s4, reaming: reaming two ends of the through hole 12 by using a drill according to the drawing size to form a first reaming hole 11 and a second reaming hole 13 after reaming;
s5, hole turning: turning a first center hole 7 and a second center hole 15 at two ends according to the drawing size, turning an inner hole 8 according to the drawing size, and turning a grinding wheel overrun groove 9;
s6, threading: turning internal threads 10 in the first reaming hole 11 according to the drawing size;
s7, heat treatment: quenching the whole pull rod to ensure HRC48-52, and performing primary stabilization treatment by ice-cooling treatment;
s8, hole grinding: grinding the first central hole 7 and the second central hole 15 according to the requirements of process drawings;
s9, rough grinding profile: grinding a first outer circular gear 1, a third outer circular gear 3 and a fifth outer circular gear 5 of the pull rod, and grinding an inner hole 8 to enable the surface roughness to reach 3.2;
s10, electric hexagon: performing electric hexagon machining on the second reaming 13 by using an electric spark machine according to the structure of the drawing to form a hexagonal hole 14;
s11, milling the shape: milling the second outer circular gear 2 according to the drawing size, removing burrs around the second outer circular gear 2, and grinding the surface roughness to 3.2;
s12, stabilizing: placing the pull rod in a container, heating to 150-160 ℃, preserving heat for 8 hours, and carrying out secondary stabilization treatment;
s13, grinding: grinding the first central hole 7 and the second central hole 15 at two ends according to the requirements of a process drawing, and simultaneously carrying out fine grinding on the inner hole 8 to ensure that the surface roughness reaches 0.4;
s14, fine grinding: finely grinding the first outer circle gear 1, the third outer circle gear 3 and the fifth outer circle gear 5 according to the requirements of a process drawing to enable the surface roughness to reach 0.4;
s15, grinding threads: the internal thread 10 is milled.
Preferably, after step S15 is completed, the method further includes the following steps: and (4) blowing and washing each machined surface of the machined pull rod by using high-pressure air to remove scrap iron and grinding wheel dust on each machined surface.
Preferably, after the washing step is completed, the method further comprises the following steps of: and (5) inspecting that the overall size, the roughness and the surface hardness of each machined surface of the product meet the requirements, and oiling, packaging and warehousing the product.
Preferably, the material adopted by the pull rod is 3Cr 13.
Preferably, in the step S2, when the through hole 12 is drilled, the rotation speed of the tool is 800r/min to 1200r/min, and the drilling speed of the tool is 200 mm/min to 250 mm/min.
Preferably, when the outer circle of the tool is rough in step S3, the cutting speed of the tool is 450 to 550m/min, and the feed rate is 0.2 to 0.3 mm/r.
Preferably, when the center hole is turned in the step S5, the cutting speed of the cutter is 100-200 m/min, and the feed rate of the cutter is 0.15-0.25 mm/r.
Preferably, the quenching temperature of the heat treatment in the step S7 is 850-960 ℃, the temperature is rapidly cooled to below 200 ℃ at a low temperature, and then the temperature is naturally cooled to the normal temperature.
Preferably, in the step S7, the ice-cooling treatment is performed by using an ice-cooling treatment tank to perform the freezing treatment immediately after the quenching of the tie bar, the ice-cooling treatment is performed while maintaining the temperature for one hour to 90 ℃, the tie bar is taken out after the holding time is up, the temperature is naturally raised in the air for 1 hour, and the tie bar is placed in a tempering furnace to temper for 4 hours at 170 ℃.
The pull rod of the electric spindle of the automatic loosening broach is a hollow and slender part, and the concentricity is ensured by a processing method of a lengthened deep hole drill in order to ensure the concentricity of the pull rod. 3Cr13 is used as a material of the pull rod, the pull rod is easy to bend and deform in processing, the stability of the pull rod production is improved by a cooling treatment process after rough processing heat treatment and a secondary stabilizing treatment process after rough grinding, the bending deformation of the pull rod is prevented, a special grinding machine is used for grinding a central hole to ensure the high precision of the central hole due to the fact that the central hole is easy to deform after heat treatment, a secondary fine center hole trimming process is adopted to ensure the precision of the central hole due to the fact that the central hole deforms after the hexagonal hole, and the processing method ensures the precision and the technical requirements of the pull rod of the electric spindle of the automatic broaching tool and meets the production requirements of the electric spindle of the automatic broaching tool in the current stage.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A processing method of an electric spindle pull rod of an automatic loosening broach comprises a pull rod, wherein the pull rod is cylindrical, the pull rod sequentially comprises a first outer circle gear (1), a second outer circle gear (2), a third outer circle gear (3), a fourth outer circle gear (4), a fifth outer circle gear (5) and a sixth outer circle gear (6) from left to right, a through hole (12) is formed in the center of the pull rod, a first broaching (11) and a second broaching (13) are arranged at two ends of the through hole (12), an internal thread (10) is arranged in the first broaching (11), a grinding wheel overrun groove (9) is formed in the outer end of the first broaching (11), an inner hole (8) is formed in the outer end of the grinding wheel overrun groove (9), a first center hole (7) is formed in the outer end of the inner hole (8), a hexagonal hole (14) is formed in the second broaching (13), and a second center hole (15) is formed in the outer end of the second broaching (13), the method is characterized in that: the processing method of the pull rod comprises the following steps:
s1, blanking: clamping and positioning the outer circle, and turning a flat end face;
s2, drilling: drilling a through hole (12) on the flat end surface of the lathe by using a deep hole drill;
s3, roughly turning the outer circle: roughly turning a first outer circle gear (1), a second outer circle gear (2), a third outer circle gear (3), a fourth outer circle gear (4), a fifth outer circle gear (5) and a sixth outer circle gear (6) according to the allowance required by the process drawing;
s4, reaming: reaming two ends of the through hole (12) by using a drill according to the drawing size, and forming a first reaming hole (11) and a second reaming hole (13) after reaming;
s5, hole turning: turning a first center hole (7) and a second center hole (15) at two ends according to the drawing size, turning an inner hole (8) according to the drawing size, and turning a grinding wheel overtravel groove (9);
s6, threading: turning internal threads (10) in the first hole expanding (11) according to the drawing size;
s7, heat treatment: quenching the whole pull rod to ensure HRC48-52, and performing primary stabilization treatment by ice-cooling treatment;
s8, hole grinding: grinding the first central hole (7) and the second central hole (15) according to the requirements of process drawings;
s9, rough grinding profile: grinding a first outer circular gear (1), a third outer circular gear (3) and a fifth outer circular gear (5) of the pull rod, and grinding an inner hole (8);
s10, electric hexagon: electrically hexagonally machining the second hole (13) according to the structure of the drawing to form a hexagonal hole (14);
s11, milling the shape: milling the second outer circular gear (2) according to the drawing size;
s12, stabilizing: placing the pull rod in a container, heating to 150-160 ℃, preserving heat for 8 hours, and carrying out secondary stabilization treatment;
s13, grinding: grinding the first central hole (7) and the second central hole (15) at two ends according to the requirements of a process drawing, and grinding an inner hole (8) at the same time;
s14, fine grinding: finely grinding the first outer circle gear (1), the third outer circle gear (3) and the fifth outer circle gear (5) according to the requirements of a process drawing;
s15, grinding threads: grinding the internal thread (10).
2. The machining method of the automatic broaching tool electric spindle pull rod according to claim 1, characterized in that: after step S15 is completed, the method further includes the following steps: and (4) blowing and washing each machined surface of the machined pull rod by using high-pressure air, and removing scrap iron and grinding wheel ash of each machined surface.
3. The machining method of the automatic broaching tool electric spindle pull rod according to claim 2, characterized in that: after the cleaning step is completed, the method also comprises the following steps of checking: and (5) inspecting that the overall size, the roughness and the surface hardness of each processing surface of the product meet the requirements, and oiling, packaging and warehousing the product.
4. The machining method of the automatic broaching tool electric spindle pull rod according to claim 1, characterized in that: the material that the pull rod adopted is 3Cr 13.
5. The machining method of the automatic broaching tool electric spindle pull rod according to claim 1, characterized in that: in the step S2, when the through hole (12) is drilled, the rotating speed of the cutter is 800 r/min-1200 r/min, and the drilling speed of the cutter is 200-250 mm/min.
6. The method for machining the electric spindle pull rod of the automatic loosening and pulling tool according to claim 1, wherein the method comprises the following steps: when the outer circle of the cutter is rough in the step S3, the cutting speed of the cutter is 450-550 m/min, and the feed rate is 0.2-0.3 mm/r.
7. The machining method of the automatic broaching tool electric spindle pull rod according to claim 1, characterized in that: when the central hole is turned in the procedure S5, the cutting speed of the cutter is 100-200 m/min, and the feed rate of the cutter is 0.15-0.25 mm/r.
8. The machining method of the automatic broaching tool electric spindle pull rod according to claim 1, characterized in that: the quenching temperature of the heat treatment in the step S7 is 850-960 ℃, the temperature is rapidly cooled to below 200 ℃ at a low temperature, and then the temperature is naturally cooled to the normal temperature.
9. The machining method of the automatic broaching tool electric spindle pull rod according to claim 1, characterized in that: the ice-cooling treatment in step S7 is performed by freezing the tie rod immediately after quenching in an ice-cooling treatment tank, maintaining the temperature for one hour to 90 ℃ for the ice-cooling treatment, taking out the tie rod after the holding time is up, naturally tempering the tie rod in air for 1 hour, and then tempering the tie rod in a tempering furnace at 170 ℃ for 4 hours.
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| CN114193094B (en) * | 2021-12-08 | 2023-08-15 | 江苏特贝尔精密机械科技有限公司 | Processing technology of ultra-high precision spindle |
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| CN2858135Y (en) * | 2006-01-20 | 2007-01-17 | 刘森钢 | Electric principal axis with automatic loose broach |
| CN101112743A (en) * | 2007-07-25 | 2008-01-30 | 江苏星晨高速电机有限公司 | Automatic triggering and broaching tool main spindle processing technics |
| CN102554581A (en) * | 2012-03-13 | 2012-07-11 | 苏州新凌高强度紧固件有限公司 | Manufacturing process of inner-hexagon cylindrical head shoulder screw |
| KR101728339B1 (en) * | 2016-02-05 | 2017-04-20 | 명화공업주식회사 | Manufacturing method for input shaft |
| CN107953071A (en) * | 2016-10-14 | 2018-04-24 | 宁波市鄞州路通液压管件厂 | A kind of sleeve processing technology |
| CN107825088A (en) * | 2017-12-11 | 2018-03-23 | 四川省川磨岷机联合数控机器股份有限公司 | A kind of precision grinder spindle processing technique |
| CN108443306A (en) * | 2018-06-08 | 2018-08-24 | 徐州安邦信汽车电机科技有限公司 | A kind of electric motor of automobile shaft and its processing method |
| CN110091138A (en) * | 2019-06-18 | 2019-08-06 | 常熟希那基汽车零件有限公司 | A kind of novel hollow production method of shaft |
| CN111872631A (en) * | 2020-05-29 | 2020-11-03 | 贵州新安航空机械有限责任公司 | Machining method for deep-hole slender shaft parts |
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