CN116423430A - Electric screwdriver output shaft structure and production process thereof - Google Patents
Electric screwdriver output shaft structure and production process thereof Download PDFInfo
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- CN116423430A CN116423430A CN202310364867.4A CN202310364867A CN116423430A CN 116423430 A CN116423430 A CN 116423430A CN 202310364867 A CN202310364867 A CN 202310364867A CN 116423430 A CN116423430 A CN 116423430A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000000227 grinding Methods 0.000 claims description 66
- 239000000463 material Substances 0.000 claims description 22
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 18
- 238000007514 turning Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000003754 machining Methods 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000005242 forging Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 230000003449 preventive effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 230000033001 locomotion Effects 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention relates to the technical field of electric screwdrivers, and discloses an electric screwdrivers output shaft structure and a production process thereof, wherein the electric screwdrivers output shaft structure comprises a central shaft, a striking block is sleeved on the outer surface of the central shaft, an output shaft is arranged on the upper surface of the striking block, two protrusions are fixedly connected to the upper surface of the striking block, a first spring is arranged between the striking block and the central shaft, a circular ring is sleeved on the outer surface of the bottom end of the output shaft, two transverse legs are fixedly connected to the outer surface of the circular ring, and a second spring is arranged between the circular ring and the output shaft; when the invention works, the striking block is driven to rotate through the central shaft, when the bulge contacts with the transverse foot, the bulge drives the striking block to slide downwards along the central shaft and compress the first spring, and meanwhile, the transverse foot drives the circular ring to slide upwards along the output shaft and compress the second spring, and at the moment, the bulge and the transverse foot can both axially displace, so that the whole movement time is reduced, the abrasion is reduced, and the service life is prolonged.
Description
Technical Field
The invention relates to the technical field of electric screwdrivers, in particular to an output shaft structure of an electric screwdrivers and a production process thereof.
Background
The electric spanner is a spanner powered by a power supply or a battery, and is a tool for tightening high-strength bolts, which is also called a high-strength bolt gun. The device mainly comprises an impact wrench, a torsion shear wrench, a fixed torque wrench, a corner wrench and an angular wrench. At present, a miniature motor is mostly adopted as a driving motor for an impact electric wrench, a striking block is used for striking a transverse foot on an output shaft to realize torque transmission, so that the inertia force generated by a high-speed rotating striking block flywheel is converted into impact force to achieve the purpose of disassembling and assembling a bolt or a nut, the electric screwdriver is one of the electric wrenches, and the output shaft is required to be assembled with a screwdriver.
The two bulges on the striking block of the existing electric screwdriver are matched with the two transverse feet of the T-shaped output shaft, the transverse feet are struck by the bulges to transfer torsion, and the striking block must have an axial displacement difference to give way to the bulges when in work.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides an output shaft structure of an electric screwdriver and a production process thereof, so as to solve the problems that an impact block of the existing electric screwdriver in the prior art needs to have an axial displacement difference to let a bulge pass when the existing electric screwdriver works, and the T-shaped output shaft cannot axially move to increase the whole movement time, so that abrasion between the bulge and the T-shaped output shaft is larger, and the service life is reduced.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an electric screw driver output shaft structure, includes the center pin, the surface cover of center pin is equipped with the striking piece, the upper surface of striking piece is provided with the output shaft, the upper surface fixedly connected with of striking piece is two protruding, be provided with first spring between striking piece and the center pin, output shaft bottom surface cover is equipped with the ring, the surface fixedly connected with of ring two horizontal feet, be provided with the second spring between ring and the output shaft.
Preferably, the bottom end of the central shaft is fixedly connected with a mounting ring, the lower surface of the striking block is provided with an annular groove, the first spring is positioned between the mounting ring and the annular groove, and the inner top wall of the annular groove is provided with a gasket and a steel ball.
Preferably, a through hole is formed between the upper side and the lower side of the striking block, the central shaft and the output shaft are both arranged coaxially with the through hole, and the transverse feet correspond to the protruding positions.
Preferably, the bottom end of the output shaft is fixedly connected with a first fixed ring, the outer surface of the output shaft is provided with a second fixed ring, and the second spring is positioned between the circular ring and the second fixed ring.
Preferably, the left and right sides of ring inner wall all fixedly connected with slider, the spout corresponding with the slider has been seted up to the surface of output shaft, the mounting hole has all been seted up to the left and right sides of second solid fixed ring, the screw hole has all been seted up to the left and right sides of output shaft surface, be provided with fastening screw in the mounting hole, fastening screw and screw hole threaded connection.
The production process of the output shaft structure of the electric screwdriver comprises the following steps:
step one, forging a blank: selecting proper chrome-manganese steel, calculating a blanking size according to the weight of a part blank, blanking round bar materials on a cutting machine according to the blanking size to form short bar materials according to the used external dimension, performing flaw detection on the short bar materials, heating the materials to 800-1250 ℃, and then placing the materials on a hammer press for forging to form blank materials, so that machining allowance is reserved on the surface of the blank materials.
Step two, CNC once: and placing the forged blank into two tools with grooves with corresponding angles, tightly pushing the blank at two ends, and then turning a pin on a workpiece to form a positioning groove.
Third, CNC secondary: and loading the blanks with the turned positioning grooves on a special fixture, supporting one end of each blank against each positioning groove, setting reasonable cutting parameters, and then machining the outer circle and chamfer by using a lathe.
Fourth, grinding the outer circle once: fixing the rough machined blank on a special fixture, and adjusting the thimble of the grinding machine to move towards the positioning groove until the positioning groove is tightly propped for rough grinding.
Step five, processing center once: and replacing a lathe tool to clamp the part into a clamping port of the numerical control machining center, and punching and slotting by using a numerical control machine tool.
Step six, processing center secondary: and fixing the punched and grooved part on a numerical control machining center by using a special fixture, and finish-milling the outer circle, the end face, the boss and the ring groove of the part by using the numerical control machining center.
Step seven, deburring: and fixing the finish-milled part in a deburring machine for clamping, and then performing deburring processing.
Step eight, heat treatment: and (5) placing the deburred part into a heat treatment box, and quenching by adopting an isothermal normalizing process.
Step nine, vibrating and grinding once: and (3) placing the processed and formed parts into a grinding machine, wherein grinding stones are added into the grinding machine, and screening qualified parts after grinding for 10-20 hours.
Step ten, grinding the outer circle for two times: and fixing qualified parts, ensuring that the inspection grinder runs stably, ensuring that the radial runout of a grinding wheel spindle is less than or equal to 2 mu m, the axial runout is less than or equal to 2 mu m, ensuring that the static rigidity of the grinding wheel spindle is less than or equal to 1 mu m/10kg when the excircle is cut into the grinding, and then grinding the excircle of the parts through the grinding wheel.
Step eleven, grinding the outer circle for three times: and (3) carrying out secondary dressing on the grinding wheel according to the grinding requirement, ensuring that the unbalanced precision grade G of the grinding wheel is less than or equal to 0.2 mm/s, determining the grinding quantity of the grinding wheel according to the grinding requirement, and carrying out fine grinding on the outer circle of the workpiece.
Step twelve, CNC finish turning is carried out once: and loading one end of the ground part into a finish turning clamp for clamping, then finish turning the excircle, the end face, the boss and the annular groove, positioning the finish turned one end, and finish turning the excircle, the end face, the boss and the annular groove at the other end.
Thirteenth step, cleaning: and (3) conveying the workpiece into a cleaning machine to clean, removing greasy dirt and impurities on the surface, taking out the cleaned part to dry, wherein the drying time is 45min, and the drying temperature is 40-50 ℃.
Fourteen steps, over rust preventive oil: and (3) immersing the surface of the part in oil to prevent the part from being rusted due to the external environment, and finally packaging.
Preferably, the part performs chamfering operation on two ends of the blank in CNC machining, and the chamfering amount is (3-5 mm) 45 degrees.
Preferably, when the machining center is used for machining, the part is placed in the three-jaw chuck of the main shaft, the cylindrical ejector rod is mounted on the lathe tailstock, a blind cavity matched with the appearance of the part is arranged in the middle of the lathe tailstock, the depth dimension of the blind cavity is smaller than the total thickness of the part, the part is placed in the blind cavity of the fixture, the tailstock is moved to press the cylindrical ejector rod on the tailstock against the surface of the part, and then machining is started.
Preferably, the heat treatment of the parts is carried out in a quenching furnace, wherein the quenching temperature is 800-850 ℃, the quenching heat preservation time is 40-50 minutes, the parts are cooled for 10 minutes under the cooperation of a cooling medium after quenching, the cooling medium temperature is minus 40-50 ℃, the heat preservation time is 60-80 minutes, the tempering temperature after quenching is 150-160 ℃, and the heat preservation time is 180-200 minutes.
(III) beneficial effects
Compared with the prior art, the invention provides the output shaft structure of the electric screwdriver and the production process thereof, and the output shaft structure has the following beneficial effects:
1. according to the electric screwdriver output shaft structure and the production process thereof, the second spring and the second fixing ring are sleeved on the outer surface of the output shaft, so that the mounting hole on the second fixing ring is aligned with the threaded hole, and then the fastening screw is screwed down to fix the second fixing ring with the output shaft, so that the circular ring can drive the transverse foot to move up and down along the output shaft to give way for the striking block, and the transmission is more stable.
2. This electronic screwdriver output shaft structure and production technology, during operation drives the striking piece through the center pin and rotates, when protruding and horizontal foot contact, because the striking piece can reciprocate along the center pin to the ring drives horizontal foot and can reciprocate along the output shaft, and protruding drive striking piece simultaneously slides down along the center pin and compresses first spring, and horizontal foot drives the ring simultaneously and upwards slides and compress second spring along the output shaft, and protruding and horizontal foot can both carry out axial displacement this moment, thereby has reduced whole motion time, has reduced wearing and tearing, has improved life.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic cross-sectional elevation view of the present invention;
FIG. 3 is a schematic perspective view of an output shaft of the present invention;
FIG. 4 is a schematic cross-sectional view of an output shaft of the present invention;
fig. 5 is an enlarged schematic view of the structure of fig. 4 a according to the present invention.
In the figure: 1. a central shaft; 2. a striking block; 3. an output shaft; 4. a protrusion; 5. a first spring; 6. a circular ring; 7. a transverse leg; 8. a second spring; 101. a mounting ring; 102. an annular groove; 103. a gasket; 104. steel balls; 201. a through hole; 301. a first fixing ring; 302. a second fixing ring; 303. a slide block; 304. a chute; 305. a mounting hole; 306. a threaded hole; 307. and (5) fastening a screw.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following describes in detail the structure of the output shaft of the electric screwdriver, the production process and method thereof with reference to the accompanying drawings.
Referring to fig. 1-5, the invention provides an output shaft structure of an electric screwdriver, which comprises a central shaft 1, wherein a striking block 2 is sleeved on the outer surface of the central shaft 1, an output shaft 3 is arranged on the upper surface of the striking block 2, two bulges 4 are fixedly connected to the upper surface of the striking block 2, a first spring 5 is arranged between the striking block 2 and the central shaft 1, a circular ring 6 is sleeved on the outer surface of the bottom end of the output shaft 3, two transverse feet 7 are fixedly connected to the outer surface of the circular ring 6, and a second spring 8 is arranged between the circular ring 6 and the output shaft 3;
specifically, the bottom end of the central shaft 1 is fixedly connected with a mounting ring 101, the lower surface of the striking block 2 is provided with an annular groove 102, a first spring 5 is positioned between the mounting ring 101 and the annular groove 102, and the inner top wall of the annular groove 102 is provided with a gasket 103 and a steel ball 104, so that the central shaft 1 can drive the striking block 2 to rotate in the rotating process, and power is better transmitted;
wherein, a through hole 201 is arranged between the upper side and the lower side of the striking block 2, the central shaft 1 and the output shaft 3 are both arranged coaxially with the through hole 201, and the transverse foot 7 corresponds to the position of the bulge 4, thus the striking block 2 can be sleeved on the outer surface of the central shaft 1, and the striking block 2 transmits power to the transverse foot 7 when rotating;
the bottom end of the output shaft 3 is fixedly connected with a first fixed ring 301, a second fixed ring 302 is arranged on the outer surface of the output shaft 3, and a second spring 8 is positioned between the circular ring 6 and the second fixed ring 302, so that the second fixed ring 302 is arranged to limit the second spring 8, and the circular ring 6 can compress the second spring 8 in the upward moving process;
further, the left side and the right side of the inner wall of the circular ring 6 are fixedly connected with sliding blocks 303, the outer surface of the output shaft 3 is provided with sliding grooves 304 corresponding to the sliding blocks 303, the left side and the right side of the outer surface of the second fixed ring 302 are provided with mounting holes 305, the left side and the right side of the outer surface of the output shaft 3 are provided with threaded holes 306, the mounting holes 305 are internally provided with fastening screws 307, and the fastening screws 307 are in threaded connection with the threaded holes 306, so that the circular ring 6 moves more stably, and the circular ring 6 transmits power to the output shaft 3 through the sliding blocks 303 in the rotating process;
the production process of the output shaft structure of the electric screwdriver comprises the following steps:
step one, forging a blank: selecting proper chrome-manganese steel, calculating a blanking size according to the weight of a part blank, blanking round bar materials on a cutting machine according to the blanking size to form short bar materials according to the used external dimension, performing flaw detection on the short bar materials, heating the materials to 800-1250 ℃, and then placing the materials on a hammer press for forging to form blank materials, so that machining allowance is reserved on the surface of the blank materials.
Step two, CNC once: and placing the forged blank into two tools with grooves with corresponding angles, tightly pushing the blank at two ends, and then turning a pin on a workpiece to form a positioning groove.
Third, CNC secondary: and loading the blanks with the turned positioning grooves on a special fixture, supporting one end of each blank against each positioning groove, setting reasonable cutting parameters, and then machining the outer circle and chamfer by using a lathe.
Fourth, grinding the outer circle once: fixing the rough machined blank on a special fixture, and adjusting the thimble of the grinding machine to move towards the positioning groove until the positioning groove is tightly propped for rough grinding.
Step five, processing center once: and replacing a lathe tool to clamp the part into a clamping port of the numerical control machining center, and punching and slotting by using a numerical control machine tool.
Step six, processing center secondary: and fixing the punched and grooved part on a numerical control machining center by using a special fixture, and finish-milling the outer circle, the end face, the boss and the ring groove of the part by using the numerical control machining center.
Step seven, deburring: and fixing the finish-milled part in a deburring machine for clamping, and then performing deburring processing.
Step eight, heat treatment: and (5) placing the deburred part into a heat treatment box, and quenching by adopting an isothermal normalizing process.
Step nine, vibrating and grinding once: and (3) placing the processed and formed parts into a grinding machine, wherein grinding stones are added into the grinding machine, and screening qualified parts after grinding for 10-20 hours.
Step ten, grinding the outer circle for two times: and fixing qualified parts, ensuring that the inspection grinder runs stably, ensuring that the radial runout of a grinding wheel spindle is less than or equal to 2 mu m, the axial runout is less than or equal to 2 mu m, ensuring that the static rigidity of the grinding wheel spindle is less than or equal to 1 mu m/10kg when the excircle is cut into the grinding, and then grinding the excircle of the parts through the grinding wheel.
Step eleven, grinding the outer circle for three times: and (3) carrying out secondary dressing on the grinding wheel according to the grinding requirement, ensuring that the unbalanced precision grade G of the grinding wheel is less than or equal to 0.2 mm/s, determining the grinding quantity of the grinding wheel according to the grinding requirement, and carrying out fine grinding on the outer circle of the workpiece.
Step twelve, CNC finish turning is carried out once: and loading one end of the ground part into a finish turning clamp for clamping, then finish turning the excircle, the end face, the boss and the annular groove, positioning the finish turned one end, and finish turning the excircle, the end face, the boss and the annular groove at the other end.
Thirteenth step, cleaning: and (3) conveying the workpiece into a cleaning machine to clean, removing greasy dirt and impurities on the surface, taking out the cleaned part to dry, wherein the drying time is 45min, and the drying temperature is 40-50 ℃.
Fourteen steps, over rust preventive oil: and (3) immersing the surface of the part in oil to prevent the part from being rusted due to the external environment, and finally packaging.
And chamfering the two ends of the blank when the part is processed by CNC, wherein the chamfering amount is (3-5 mm) 45 degrees.
Further, when the machining center processes, the parts are placed in the three-jaw chuck of the main shaft, the cylindrical ejector rod is mounted on the lathe tailstock, a blind cavity matched with the appearance of the parts is formed in the middle of the lathe tailstock, the depth dimension of the blind cavity is smaller than the total thickness of the parts, the parts are placed in the blind cavity of the fixture, the tailstock is moved to press the cylindrical ejector rod on the tailstock against the surfaces of the parts, and then the machining is started.
Specifically, the heat treatment of the parts is carried out in a quenching furnace, the quenching temperature is 800-850 ℃, the quenching heat preservation time is 40-50 minutes, the parts are cooled for 10 minutes under the cooperation of a cooling medium after quenching, the cooling medium temperature is minus 40-50 ℃, the heat preservation time is 60-80 minutes, the tempering temperature after quenching is 150-160 ℃, and the heat preservation time is 180-200 minutes.
The working principle of the invention is as follows: when the novel impact device is used, the second spring 8 and the second fixing ring 302 are sleeved on the outer surface of the output shaft 3, the mounting hole 305 on the second fixing ring 302 is aligned with the threaded hole 306, then the fastening screw 307 is screwed to fix the second fixing ring 302 and the output shaft 3 together, the central shaft 1 drives the impact block 2 to rotate during operation, when the bulge 4 is in contact with the transverse foot 7, the impact block 2 can move up and down along the central shaft 1, the circular ring 6 drives the transverse foot 7 to move up and down along the output shaft 3, the bulge 4 drives the impact block 2 to slide downwards along the central shaft 1 and compress the first spring 5, the transverse foot 7 drives the circular ring 6 to slide upwards along the output shaft 3 and compress the second spring 8, and the bulge 4 and the transverse foot 7 can both axially displace, so that the whole movement time is reduced, abrasion is reduced, and the service life is prolonged.
It will be understood that the invention has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. The utility model provides an electric screw driver output shaft structure, includes center pin (1), its characterized in that: the outer surface cover of center pin (1) is equipped with strikes piece (2), the upper surface of striking piece (2) is provided with output shaft (3), the upper surface fixedly connected with of striking piece (2) is two protruding (4), be provided with first spring (5) between striking piece (2) and center pin (1), the outer surface cover of output shaft (3) bottom is equipped with ring (6), the outer surface fixedly connected with of ring (6) two horizontal feet (7), be provided with second spring (8) between ring (6) and output shaft (3).
2. The electric screwdriver output shaft structure according to claim 1, wherein: the novel hammer is characterized in that a mounting ring (101) is fixedly connected to the bottom end of the central shaft (1), an annular groove (102) is formed in the lower surface of the striking block (2), the first spring (5) is located between the mounting ring (101) and the annular groove (102), and a gasket (103) and a steel ball (104) are arranged on the inner top wall of the annular groove (102).
3. The electric screwdriver output shaft structure according to claim 2, wherein: through holes (201) are formed between the upper side and the lower side of the striking block (2), the central shaft (1) and the output shaft (3) are arranged coaxially with the through holes (201), and the transverse feet (7) correspond to the protrusions (4).
4. A power screwdriver output shaft structure as defined in claim 3, wherein: the novel high-speed motor is characterized in that a first fixing ring (301) is fixedly connected to the bottom end of the output shaft (3), a second fixing ring (302) is mounted on the outer surface of the output shaft (3), and the second spring (8) is located between the circular ring (6) and the second fixing ring (302).
5. The structure of the output shaft of the electric screwdriver according to claim 4, wherein: the novel rotary shaft is characterized in that sliding blocks (303) are fixedly connected to the left side and the right side of the inner wall of the circular ring (6), sliding grooves (304) corresponding to the sliding blocks (303) are formed in the outer surface of the output shaft (3), mounting holes (305) are formed in the left side and the right side of the second fixing ring (302), threaded holes (306) are formed in the left side and the right side of the outer surface of the output shaft (3), fastening screws (307) are arranged in the mounting holes (305), and the fastening screws (307) are in threaded connection with the threaded holes (306).
6. A production process of an output shaft structure of an electric screwdriver, comprising the output shaft structure of the electric screwdriver as claimed in any one of claims 1 to 5, and characterized in that: the method comprises the following steps:
step one, forging a blank: selecting proper chrome-manganese steel, calculating a blanking size according to the weight of a part blank, blanking round bar materials on a cutting machine according to the blanking size to form short bar materials according to the used external dimension, performing flaw detection on the short bar materials, heating the materials to 800-1250 ℃, and then placing the materials on a hammer press for forging to form blank materials, so that machining allowance is reserved on the surface of the blank materials.
Step two, CNC once: and placing the forged blank into two tools with grooves with corresponding angles, tightly pushing the blank at two ends, and then turning a pin on a workpiece to form a positioning groove.
Third, CNC secondary: and loading the blanks with the turned positioning grooves on a special fixture, supporting one end of each blank against each positioning groove, setting reasonable cutting parameters, and then machining the outer circle and chamfer by using a lathe.
Fourth, grinding the outer circle once: fixing the rough machined blank on a special fixture, and adjusting the thimble of the grinding machine to move towards the positioning groove until the positioning groove is tightly propped for rough grinding.
Step five, processing center once: and replacing a lathe tool to clamp the part into a clamping port of the numerical control machining center, and punching and slotting by using a numerical control machine tool.
Step six, processing center secondary: and fixing the punched and grooved part on a numerical control machining center by using a special fixture, and finish-milling the outer circle, the end face, the boss and the ring groove of the part by using the numerical control machining center.
Step seven, deburring: and fixing the finish-milled part in a deburring machine for clamping, and then performing deburring processing.
Step eight, heat treatment: and (5) placing the deburred part into a heat treatment box, and quenching by adopting an isothermal normalizing process.
Step nine, vibrating and grinding once: and (3) placing the processed and formed parts into a grinding machine, wherein grinding stones are added into the grinding machine, and screening qualified parts after grinding for 10-20 hours.
Step ten, grinding the outer circle for two times: and fixing qualified parts, ensuring that the inspection grinder runs stably, ensuring that the radial runout of a grinding wheel spindle is less than or equal to 2 mu m, the axial runout is less than or equal to 2 mu m, ensuring that the static rigidity of the grinding wheel spindle is less than or equal to 1 mu m/10kg when the excircle is cut into the grinding, and then grinding the excircle of the parts through the grinding wheel.
Step eleven, grinding the outer circle for three times: and (3) carrying out secondary dressing on the grinding wheel according to the grinding requirement, ensuring that the unbalanced precision grade G of the grinding wheel is less than or equal to 0.2 mm/s, determining the grinding quantity of the grinding wheel according to the grinding requirement, and carrying out fine grinding on the outer circle of the workpiece.
Step twelve, CNC finish turning is carried out once: and loading one end of the ground part into a finish turning clamp for clamping, then finish turning the excircle, the end face, the boss and the annular groove, positioning the finish turned one end, and finish turning the excircle, the end face, the boss and the annular groove at the other end.
Thirteenth step, cleaning: and (3) conveying the workpiece into a cleaning machine to clean, removing greasy dirt and impurities on the surface, taking out the cleaned part to dry, wherein the drying time is 45min, and the drying temperature is 40-50 ℃.
Fourteen steps, over rust preventive oil: and (3) immersing the surface of the part in oil to prevent the part from being rusted due to the external environment, and finally packaging.
7. The process for producing the output shaft structure of the electric screwdriver according to claim 6, wherein the process comprises the following steps: and chamfering operation is carried out on two ends of the blank when the part is processed by CNC, wherein the chamfering amount is (3-5 mm) 45 degrees.
8. The process for producing the output shaft structure of the electric screwdriver according to claim 7, wherein: when the machining center is used for machining, a part is placed in the three-jaw chuck of the main shaft, a cylindrical ejector rod is mounted on a lathe tailstock, a blind cavity matched with the appearance of the part is formed in the middle of the lathe tailstock, the depth dimension of the blind cavity is smaller than the total thickness of the part, the part is placed in the blind cavity of the fixture, the tailstock is moved to press the cylindrical ejector rod on the tailstock against the surface of the part, and then machining is started.
9. The process for producing the output shaft structure of the electric screwdriver according to claim 8, wherein the process comprises the following steps: the heat treatment of the parts is carried out in a quenching furnace, the quenching temperature is 800-850 ℃, the quenching heat preservation time is 40-50 minutes, the parts are cooled for 10 minutes under the cooperation of a cooling medium after quenching, the cooling medium temperature is minus 40-50 ℃, the heat preservation time is 60-80 minutes, the tempering temperature after quenching is 150-160 ℃, and the heat preservation time is 180-200 minutes.
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| CN202310364867.4A CN116423430A (en) | 2023-04-07 | 2023-04-07 | Electric screwdriver output shaft structure and production process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117259821A (en) * | 2023-11-23 | 2023-12-22 | 成都成缸液压设备制造有限公司 | Machining mechanism for machining inner hole of high-pressure oil cylinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117259821A (en) * | 2023-11-23 | 2023-12-22 | 成都成缸液压设备制造有限公司 | Machining mechanism for machining inner hole of high-pressure oil cylinder |
| CN117259821B (en) * | 2023-11-23 | 2024-02-09 | 成都成缸液压设备制造有限公司 | Machining mechanism for machining inner hole of high-pressure oil cylinder |
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