CN107654478B - Input one shaft for automobile gearbox and rough machining process of input one shaft - Google Patents
Input one shaft for automobile gearbox and rough machining process of input one shaft Download PDFInfo
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- CN107654478B CN107654478B CN201710801129.6A CN201710801129A CN107654478B CN 107654478 B CN107654478 B CN 107654478B CN 201710801129 A CN201710801129 A CN 201710801129A CN 107654478 B CN107654478 B CN 107654478B
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- 238000003754 machining Methods 0.000 title abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000003801 milling Methods 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 238000007514 turning Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims description 3
- 102220314147 rs1553498753 Human genes 0.000 claims description 3
- 102220061219 rs786201529 Human genes 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 claims description 3
- 102220051105 rs114668710 Human genes 0.000 claims description 2
- 102220053607 rs200114285 Human genes 0.000 claims description 2
- 102220076495 rs200649587 Human genes 0.000 claims description 2
- 102220090538 rs371431782 Human genes 0.000 claims description 2
- 102220028374 rs386352313 Human genes 0.000 claims description 2
- 102220015600 rs397517489 Human genes 0.000 claims description 2
- 102220254834 rs759699517 Human genes 0.000 claims description 2
- 102220065835 rs77316189 Human genes 0.000 claims description 2
- 238000010606 normalization Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
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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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses an input one-shaft for an automobile gearbox and a rough machining process thereof, wherein the input one-shaft is integrated and comprises a first shaft section to a twelfth shaft section which are sequentially connected; is provided with a central hole, a notch and a step shaft section. The process comprises the following steps: checking raw materials; blanking; heating; rolling; removing the stub bar; decomposing; straightening; isothermal normalizing; milling end faces and drilling center holes; roughly turning the short end; a thick vehicle long end; checking and warehousing; the invention has the beneficial effects that the flaw detection is carried out once before straightening: the process meets the requirements of high precision of parts and workpiece requirements of heat treatment tissues, and the adoption of the isothermal normalizing process realizes effective control of the quality of the parts, thereby improving the machinability and the heat treatment deformation stability. Isothermal normalizing is a more common normalization that can achieve a uniform and consistent desired microstructure and hardness.
Description
Technical Field
The invention relates to an automobile gearbox part and a processing technology thereof, in particular to an input one shaft for an automobile gearbox and a rough processing technology thereof.
Background
A transmission is one of the main components of an automotive transmission system. The actual use conditions of the automobile are very complex, such as starting, idling stop, low-speed or high-speed running, acceleration, deceleration, climbing, reversing and the like, so that the driving force and the speed of the automobile are required to be changed within a quite large range, and the output torque and the rotating speed of the piston engine widely adopted at present are relatively small in change range. In order to adapt to the driving conditions which change frequently and simultaneously enable the engine to work under favorable working conditions (higher power and lower oil consumption), a transmission is arranged in a transmission system. The input shaft is a shaft for power to enter the speed changer, the power enters the speed changer from the engine through the input shaft, then the input gear on the input shaft drives the shaft to transmit the power to the output gear to drive the output shaft to rotate, and the differential mechanism is driven to move, so that the automobile can move forwards or backwards.
After power enters the gearbox housing from the input shaft, travel between the gears will begin. The gear in the box is well divided into two input shafts and two output shafts, and then a set of parking locking mechanism and a differential mechanism for conveying power to the wheel half shafts are added. The two input shafts are respectively connected with the K1 clutch and the K2 clutch, a 1357 gear is arranged on the input shaft, and a 246R gear is arranged on the input shaft. When the two clutches are alternately operated, power is continued between the odd and even gears. While gears 1-4 are connected to the output first shaft, gears 5-7 are connected to the output second shaft, and reverse and park locks are connected to the output third shaft.
The input shaft of the gearbox is a shaft part working under high-speed and heavy-load conditions, and has fatigue resistance, wear resistance, enough strength, rigidity, mechanical property and the like in the repeated motion process, so the requirements on material selection, blank manufacturing, machining, heat treatment, tolerance requirements and the like are very high, and the use requirements cannot be well met in the conventional production.
Disclosure of Invention
The invention aims to solve the technical problem of providing an input shaft for an automobile gearbox, which has high production precision and meets the use requirement by a heat treatment organization, and a rough machining process thereof.
The invention solves the technical problems through the following technical scheme: the input shaft is an input shaft after rough machining, the input shaft is integrated, and a first central hole and a second central hole are formed in two ends of the input shaft, and the input shaft comprises a first shaft section, a second shaft section, a third shaft section, a fourth shaft section, a fifth shaft section, a sixth shaft section, a seventh shaft section, an eighth shaft section, a ninth shaft section, a tenth shaft section, an eleventh shaft section and a twelfth shaft section which are sequentially connected; the connecting surface of the fifth shaft section and the fourth shaft section is provided with a notch, and the connecting surface of the fifth shaft section and the sixth shaft section is provided with a first step shaft section, a second step shaft section and a third step shaft section.
Preferably, the diameter of the fifth shaft section is the largest, the diameters of the first step shaft section, the second step shaft section and the third step shaft section are sequentially reduced, the diameter of the third step shaft section is larger than that of the sixth shaft section, and the diameters of the seventh shaft section and the ninth shaft section are equal; the notch is annular, the diameter of the inner ring is smaller than that of the fourth shaft section, and the diameter of the outer ring is smaller than that of the fifth shaft section.
Preferably, a connecting surface of the third shaft section and the second shaft section is taken as a reference surface, the distance from the head end of the first shaft section to the reference surface is l1=31.95 mm, and the diameter d1=28.3 mm; the distance from the head end of the second shaft section to the reference surface is L2=16.25 mm, and the diameter D2=32.8 mm; the axial length of the third shaft section is L3=21.3 mm, and the diameter D3=48.9 mm; the distance from the tail end of the fourth shaft section to the reference surface is L4= 41.85mm, and the diameter D4=31.2 mm; the distance from the tail end of the fifth shaft section to the reference surface is L5=57.2 mm, the diameter D5=86.6 mm, the distance from the first step shaft section to the reference surface is L51=60.6 mm, the diameter D51=62.5 mm, the distance from the second step shaft section to the reference surface is L52=65.5 mm, the diameter D52=53.3 mm, the distance from the third step shaft section to the reference surface is L53=68.1 mm, and the diameter D53=48.5 mm; the distance from the sixth shaft section to the reference surface is l6=102 mm, and the diameter d6=31.3 mm; the seventh shaft section is L7 = 149mm from the reference plane, and the diameter D7 = 26.3mm; the eighth shaft section has a length l8=13.3 mm and a diameter d8=21.3 mm; the distance from the ninth shaft section to the reference surface is l9=191.2 mm, and the diameter d9=26.3 mm; the tenth shaft section is separated from the reference surface by L10=240.2 mm, and the diameter D10=21.7 mm; the eleventh axis segment to datum distance l11=268.9 mm, diameter d11=23.8 mm, twelfth axis segment to datum distance l12= 299.4mm, diameter d12=19.3 mm.
Preferably, the tolerance of the distance from the head end of the first shaft section to the reference surface and the tolerance of the distance from the tail end of the fourth shaft section to the reference surface are +0.08mm to-0.08 mm, the tolerance of the rest distance or length is +0.1mm to-0.1 mm, and the tolerance of the diameter of the output shaft is 0 to-0.15 mm.
Preferably, a transition section with a trapezoid central axis section is arranged at the joint of the sixth shaft section and the seventh shaft section; and each adjacent two joints of the ninth shaft section, the tenth shaft section, the eleventh shaft section and the twelfth shaft section are provided with transition sections with trapezoidal sections.
Preferably, the first central hole and the second central hole are formed by the tangency of a circular arc hole and a cylindrical hole, when a sphere with the diameter of S phi 22mm is tangential to the circular arc hole with the diameter of R36mm, the roundness of the sphere is 0.03mm, the distance L13=14.7 mm between the end point of the sphere and the end face of the first shaft section, and the tolerance is +0.05mm to-0.05mm; when a sphere with S phi 5mm is tangent to an arc hole with R8mm, the roundness of the sphere is 0.03mm, the distance L14=2.95 mm between the end point of the sphere and the end face of the twelfth shaft section, and the tolerance is +0.05mm to-0.05mm; the depth of the first central hole is 25mm, and the diameter of the cylinder is 10mm; the second central hole had a depth of 6.5mm and a cylindrical diameter of 2.5mm.
Preferably, the notch is annular, the minimum diameter of the notch is smaller than the diameter of the fourth shaft section, the maximum diameter of the notch is smaller than the diameter of the fifth shaft section, and the depth of the notch is smaller than the length of the fifth shaft section.
Preferably, the depth of the notch is 6.35mm, the tolerance is +0.03mm to-0.03 mm, the minimum radius of the notch is 30mm, the tolerance is +0.2mm to 0mm, the notch forms 20 degrees with a fourth shaft section generating line, the maximum radius is 60.26, the tolerance is +0.1mm to-0.1 mm, and the notch forms 70 degrees with the end face of the fifth shaft section.
The invention also provides a rough machining process of the input one shaft for the automobile gearbox, which comprises the following steps:
step 1: raw material inspection, namely, performing component detection by using a stokehold spectrum analyzer, visually inspecting a macroscopic tissue by acid etching, testing the hardenability of the tail end by a Rockwell hardness tester, observing a banded tissue by using a microscope, and observing an internal tissue by using an ultrasonic flaw detector;
step 2: discharging, namely decomposing raw materials by using a band sawing machine, and ensuring that the verticality of the end face is less than or equal to 1mm;
step 3: heating by using a 500KW intermediate frequency furnace, wherein the heating temperature is 1080-1180 ℃, and the heating beat is 31+/-2 seconds;
step 4: rolling, namely rolling and forming by using a cross wedge rolling mill;
step 5: removing the stub bar, namely removing the stub bar by using a band sawing machine;
step 6: decomposing, namely performing intermediate decomposition by using a band sawing machine;
step 7: straightening, namely straightening a workpiece by using a hydraulic straightening machine, wherein the circle runout is less than or equal to 0.8mm;
step 8: isothermal normalizing, treating by using a push rod type isothermal normalizing furnace to realize hardness: HB150-180, hardness uniformity: the same batch is less than or equal to 20HB, the single piece is less than or equal to 10HB, and the same cross section is less than or equal to 5HB; metallographic structure: P+F is less than or equal to 3 levels, and the band-shaped tissue is less than or equal to 3 levels; grain size 5-8 grade;
step 9: milling the end face and drilling the center hole, wherein the milling and drilling numerical control machine tool is used for milling the end face and drilling the center hole, the depth of the center hole of the large end face is 25mm, and the depth of the center hole of the other end is 6.5mm; roughness is Ra2.5, and runout of each outer circle and each end face to the central hole is less than or equal to 0.10;
step 10: roughly turning the short end by a precise numerical control lathe;
step 11: roughly turning the long end, and roughly turning the long end by a precise numerical control lathe;
step 12: checking and warehousing;
performing flaw detection treatment on the workpiece by using an ultrasonic flaw detector between the step 7 and the step 8; the machine tool rotation speed of the step 10 and the step 11 is as follows: 950r/min, feed: 150mm/min.
Compared with the prior art, the invention has the following advantages: the invention has high part precision, the heat treatment structure meets the workpiece requirement, and the adoption of the isothermal normalizing process realizes the effective control of the part quality, thereby improving the cutting processability and the heat treatment deformation stability. Isothermal normalizing is a more common normalization that can achieve a uniform and consistent desired microstructure and hardness.
Drawings
FIG. 1 is a process flow diagram of an input shaft for an automotive transmission according to the present invention;
FIG. 2 is a schematic partial cross-sectional view of an input shaft for an automotive transmission according to the present invention;
FIG. 3 is a schematic dimensional view of an input shaft for an automotive transmission according to the present invention.
First shaft segment 110 second shaft segment 120 third shaft segment 130 fourth shaft segment 140 fifth shaft segment 150 sixth shaft segment 160 seventh shaft segment 170 eighth shaft segment 180 eighth shaft segment 190 tenth shaft segment 1100 eleventh shaft segment 1110 twelfth shaft segment 1120 first step shaft segment 151 second step shaft segment 152 third step shaft segment 153 first central bore 310 second central bore 320 notch 210
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
As shown in fig. 2, the present embodiment includes that the input shaft is a rough machined input shaft, and the input shaft is integrated, and has a first positioning hole 310 and a second positioning hole 320 at two ends, including a first shaft section 110, a second shaft section 120, a third shaft section 130, a fourth shaft section 140, a fifth shaft section 150, a sixth shaft section 160, a seventh shaft section 170, an eighth shaft section 180, a ninth shaft section 190, a tenth shaft section 1100, an eleventh shaft section 1110, and a twelfth shaft section 1120 that are sequentially connected; the connection surface of the fifth shaft section 150 and the fourth shaft section 140 is provided with a notch 210, and the connection surface of the sixth shaft section 160 is provided with a first step shaft section 151, a second step shaft section 152 and a third step shaft section 153.
The diameter of the fifth shaft section 150 is the largest, the diameters of the first step shaft section 151, the second step shaft section 152 and the third step shaft section 153 are sequentially reduced, the diameter of the third step shaft section 153 is larger than the diameter of the sixth shaft section 160, and the diameters of the seventh shaft section 170 and the ninth shaft section 190 are equal; the notch 210 is annular, the diameter of the inner ring is smaller than the diameter of the fourth shaft section 140, and the diameter of the outer ring is smaller than the diameter of the fifth shaft section 150.
As shown in fig. 3, the connection surface of the third shaft section 130 and the second shaft section 120 is taken as a reference surface, the distance from the head end of the first shaft section 110 to the reference surface is l1=31.95 mm, and the diameter d1=28.3 mm; the distance from the head end of the second shaft section 120 to the reference surface is l2=16.25 mm, and the diameter d2=32.8 mm; the axial length of the third shaft section 130 is l3=21.3 mm, and the diameter d3=48.9 mm; the distance from the tail end of the fourth shaft section 140 to the reference surface is l4= 41.85mm, and the diameter d4=31.2 mm; the distance from the tail end of the fifth shaft section 150 to the reference surface is l5=57.2 mm, the diameter d5=86.6 mm, the distance from the first step shaft section 152 to the reference surface is l51=60.6 mm, the diameter d51=62.5 mm, the distance from the second step shaft section 152 to the reference surface is l52=65.5 mm, the diameter d52=53.3 mm, the distance from the third step shaft section 153 to the reference surface is l53=68.1 mm, and the diameter d53=48.5 mm; the sixth shaft segment 160 is located at a reference plane distance l6=102 mm and a diameter d6=31.3 mm; the seventh shaft section 170 is separated from the reference plane by l7=149 mm, and has a diameter d7=26.3 mm; eighth shaft segment 180 has a length l8=13.3 mm and a diameter d8=21.3 mm; the ninth axial segment 190 is a distance l9=191.2 mm from the datum plane, and a diameter d9=26.3 mm; tenth shaft section 1100 is separated from the datum plane by l10=240.2 mm, and has a diameter d10=21.7 mm; the eleventh shaft segment 1110 is l11=268.9 mm from the reference plane, d11=23.8 mm in diameter, and the twelfth shaft segment 1120 is l12= 299.4mm from the reference plane, d12=19.3 mm in diameter.
The tolerance of the distance from the head end of the first shaft section 110 to the reference surface and the tolerance of the distance from the tail end of the fourth shaft section 140 to the reference surface are +0.08mm to-0.08 mm, the tolerance of the rest distance or length is +0.1mm to-0.1 mm, and the tolerance of the diameter of the output shaft is 0 to-0.15 mm.
A transition section with a trapezoid central axis section is arranged at the joint of the sixth shaft section 160 and the seventh shaft section 170; each adjacent two joints of the ninth shaft section 190, the tenth shaft section 1100, the eleventh shaft section 1110 and the twelfth shaft section 1120 are provided with transition sections with trapezoidal sections.
The first center hole 310 and the second center hole 320 are formed by the tangency of a circular arc hole and a cylindrical hole, when a sphere with the diameter of S phi 22mm is tangent to a circular arc hole with the diameter of R36mm, the roundness of the sphere is 0.03mm, the distance L13=14.7 mm between the end point of the sphere and the end surface of the first shaft section 110, and the tolerance is +0.05mm to-0.05mm; when a sphere with S phi 5mm is tangent to an arc hole with R8mm, the roundness of the sphere is 0.03mm, the distance L14=2.95 mm between the end point of the sphere and the end face of the twelfth shaft section 1120 is between +0.05mm and-0.05mm; the first central hole 310 has a depth of 25mm and a cylindrical diameter of 10mm; the second central hole 320 has a depth of 6.5mm and a cylindrical diameter of 2.5mm.
The notch 210 is annular, the minimum diameter of the notch 210 is smaller than the diameter of the fourth shaft section 140, the maximum diameter is smaller than the diameter of the fifth shaft section, and the depth of the notch 210 is smaller than the length of the fifth shaft section.
The depth of the notch 210 is 6.35mm, the tolerance is +0.03mm to-0.03 mm, the minimum radius of the notch is 30mm, the tolerance is +0.2mm to 0mm, the notch forms 20 degrees with the generatrix of the fourth shaft section 140, the maximum radius is 60.26, the tolerance is +0.1mm to-0.1 mm, and the notch forms 70 degrees with the end face of the fifth shaft section 150.
As shown in fig. 1, the invention also provides a rough machining process of an input one shaft for an automobile gearbox, which comprises the following steps:
step 1: raw material inspection, namely, performing component detection by using a stokehold spectrum analyzer, visually inspecting a macroscopic tissue by acid etching, testing the hardenability of the tail end by a Rockwell hardness tester, observing a banded tissue by using a microscope, and observing an internal tissue by using an ultrasonic flaw detector;
step 2: discharging, namely decomposing raw materials by using a band sawing machine, and ensuring that the verticality of the end face is less than or equal to 1mm;
step 3: heating by using a 500KW intermediate frequency furnace, wherein the heating temperature is 1080-1180 ℃, and the heating beat is 31+/-2 seconds;
step 4: rolling, namely rolling and forming by using a cross wedge rolling mill;
step 5: removing the stub bar, namely removing the stub bar by using a band sawing machine;
step 6: decomposing, namely performing intermediate decomposition by using a band sawing machine;
step 7: straightening, namely straightening a workpiece by using a hydraulic straightening machine, wherein the circle runout is less than or equal to 0.8mm;
step 8: isothermal normalizing, treating by using a push rod type isothermal normalizing furnace to realize hardness: HB150-180, hardness uniformity: the same batch is less than or equal to 20HB, the single piece is less than or equal to 10HB, and the same cross section is less than or equal to 5HB; metallographic structure: P+F is less than or equal to 3 levels, and the band-shaped tissue is less than or equal to 3 levels; grain size 5-8 grade;
step 9: milling the end face and drilling the center hole, wherein the milling and drilling numerical control machine tool is used for milling the end face and drilling the center hole, the depth of the center hole of the large end face is 25mm, and the depth of the center hole of the other end is 6.5mm; roughness is Ra2.5, and runout of each outer circle and each end face to the central hole is less than or equal to 0.10;
step 10: roughly turning the short end by a precise numerical control lathe;
step 11: roughly turning the long end, and roughly turning the long end by a precise numerical control lathe;
step 12: checking and warehousing;
performing flaw detection treatment on the workpiece by using an ultrasonic flaw detector between the step 7 and the step 8; the machine tool rotation speed of the step 10 and the step 11 is as follows: 950r/min, feed: 150mm/min.
The inspection position is taken from the second and eleventh shaft sections.
In the working process of the invention, an input first shaft is arranged in a hollow input second shaft and is connected with a clutch I through a spline, the input first shaft is connected with a 1/3/reverse gear and a 5-gear spiral gear, and a target wheel of a rotation speed sensor of the input first shaft is arranged between the 1 gear and the 3 gear; the input two shafts are connected with the clutch II through the spline, the input two shafts are provided with 2/4/6 gears, and the rotating speed sensor target wheels corresponding to the gears between the 2 gears and the 4 gears are also arranged.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The input one shaft for the automobile gearbox is characterized in that the input one shaft is a rough machined input one shaft, the input one shaft is integrated, a first central hole and a second central hole are formed in two ends of the input one shaft, and the input one shaft comprises a first shaft section, a second shaft section, a third shaft section, a fourth shaft section, a fifth shaft section, a sixth shaft section, a seventh shaft section, an eighth shaft section, a ninth shaft section, a tenth shaft section, an eleventh shaft section and a twelfth shaft section which are sequentially connected; a notch is formed in the connecting surface of the fifth shaft section and the fourth shaft section, and a first step shaft section, a second step shaft section and a third step shaft section are arranged on the connecting surface of the fifth shaft section and the sixth shaft section; the diameter of the fifth shaft section is the largest, the diameters of the first step shaft section, the second step shaft section and the third step shaft section are sequentially reduced, the diameter of the third step shaft section is larger than that of the sixth shaft section, and the diameters of the seventh shaft section and the ninth shaft section are equal; the notch is annular, the diameter of the inner ring is smaller than that of the fourth shaft section, and the diameter of the outer ring is smaller than that of the fifth shaft section; taking the connecting surface of the third shaft section and the second shaft section as a reference surface, wherein the distance from the head end of the first shaft section to the reference surface is L1=31.95 mm, and the diameter D1=28.3 mm; the distance from the head end of the second shaft section to the reference surface is L2=16.25 mm, and the diameter D2=32.8 mm; the axial length of the third shaft section is L3=21.3 mm, and the diameter D3=48.9 mm; the distance from the tail end of the fourth shaft section to the reference surface is L4= 41.85mm, and the diameter D4=31.2 mm; the distance from the tail end of the fifth shaft section to the reference surface is L5=57.2 mm, the diameter D5=86.6 mm, the distance from the first step shaft section to the reference surface is L51=60.6 mm, the diameter D51=62.5 mm, the distance from the second step shaft section to the reference surface is L52=65.5 mm, the diameter D52=53.3 mm, the distance from the third step shaft section to the reference surface is L53=68.1 mm, and the diameter D53=48.5 mm; the distance from the sixth shaft section to the reference surface is l6=102 mm, and the diameter d6=31.3 mm; the seventh shaft section is L7 = 149mm from the reference plane, and the diameter D7 = 26.3mm; the eighth shaft section has a length l8=13.3 mm and a diameter d8=21.3 mm; the distance from the ninth shaft section to the reference surface is l9=191.2 mm, and the diameter d9=26.3 mm; the tenth shaft section is separated from the reference surface by L10=240.2 mm, and the diameter D10=21.7 mm; the eleventh shaft section is distant from the reference surface by l11=268.9 mm, the diameter d11=23.8 mm, the twelfth shaft section is distant from the reference surface by l12= 299.4mm, the diameter d12=19.3 mm; the tolerance of the distance L1 from the head end of the first shaft section to the reference surface and the tolerance of the distance L4 from the tail end of the fourth shaft section to the reference surface are +0.08mm to-0.08 mm, and the tolerance of L2, L3, L5, L51, L52, L53, L6, L7, L8, L9, L10, L11 and L12 are +0.1mm to-0.1 mm, and the tolerance of the diameter of the input shaft is 0 to-0.15 mm.
2. The input shaft for an automobile gearbox according to claim 1, wherein a transition section with a trapezoid central shaft section is arranged at the joint of the sixth shaft section and the seventh shaft section; and each adjacent two joints of the ninth shaft section, the tenth shaft section, the eleventh shaft section and the twelfth shaft section are provided with transition sections with trapezoidal sections.
3. The input shaft for the automobile gearbox according to claim 1, wherein the first central hole and the second central hole are formed by tangent of an arc hole and a cylindrical hole, when a ball with the diameter of 22mm is tangent to an R36mm arc hole, the roundness of the tangent position of the ball and the arc hole is 0.03mm, the distance L13=14.7 mm between the end point of the ball and the end face of the first shaft section is between +0.05mm and-0.05mm; when a ball with the diameter of 5mm is adopted to be tangent with the R8mm circular arc hole, the roundness of the tangent position of the ball and the circular arc hole is 0.03mm, the distance L14=2.95 mm between the ball end point and the end face of the twelfth shaft section, and the tolerance is +0.05mm to-0.05mm; the depth of the first central hole is 25mm, and the diameter of the cylinder is 10mm; the second central hole had a depth of 6.5mm and a cylindrical diameter of 2.5mm.
4. An input shaft for an automotive transmission according to claim 1, wherein the notch is annular, the minimum diameter of the notch is smaller than the diameter of the fourth shaft section, the maximum diameter is smaller than the diameter of the fifth shaft section, and the depth of the notch is smaller than the length of the fifth shaft section.
5. An input shaft for an automotive transmission according to claim 4, characterized in that the notch has a depth of 6.35mm, a tolerance of +0.03mm to-0.03 mm, a minimum radius of 30mm, a tolerance of +0.2mm to 0mm, a maximum radius of 60.26mm, a tolerance of +0.1mm to-0.1 mm, and a tolerance of 70 ° to the fifth shaft segment end face.
6. A process for roughing an input shaft for a motor vehicle gearbox according to any one of claims 1-5, characterized in that the process steps are as follows:
step 1: raw material inspection, namely, performing component detection by using a stokehold spectrum analyzer, visually inspecting a macroscopic tissue by acid etching, testing the hardenability of the tail end by a Rockwell hardness tester, observing a banded tissue by using a microscope, and observing an internal tissue by using an ultrasonic flaw detector;
step 2: discharging, namely decomposing raw materials by using a band sawing machine, and ensuring that the verticality of the end face is less than or equal to 1mm;
step 3: heating by using a 500KW intermediate frequency furnace, wherein the heating temperature is 1080-1180 ℃, and the heating beat is 31+/-2 seconds;
step 4: rolling, namely rolling and forming by using a cross wedge rolling mill;
step 5: removing the stub bar, namely removing the stub bar by using a band sawing machine;
step 6: decomposing, namely performing intermediate decomposition by using a band sawing machine;
step 7: straightening, namely straightening a workpiece by using a hydraulic straightening machine, wherein the circle runout is less than or equal to 0.8mm;
step 8: isothermal normalizing, treating by using a push rod type isothermal normalizing furnace to realize hardness: HB150-180, hardness uniformity: the same batch is less than or equal to 20HB, the single piece is less than or equal to 10HB, and the same cross section is less than or equal to 5HB; metallographic structure: P+F is less than or equal to 3 levels, and the band-shaped tissue is less than or equal to 3 levels; grain size 5-8 grade;
step 9: milling the end face and drilling the center hole, wherein the milling and drilling numerical control machine tool is used for milling the end face and drilling the center hole, the depth of the center hole of the large end face is 25mm, and the depth of the center hole of the other end is 6.5mm; the roughness is Ra2.5, and the runout tolerance of each outer circle and each end face to the central hole is less than or equal to 0.10;
step 10: roughly turning the short end by a precise numerical control lathe;
step 11: roughly turning the long end, and roughly turning the long end by a precise numerical control lathe;
step 12: checking and warehousing;
performing flaw detection treatment on the workpiece by using an ultrasonic flaw detector between the step 7 and the step 8; the machine tool rotation speed of the step 10 and the step 11 is as follows: 950r/min, feed: 150mm/min.
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| CN114905235A (en) * | 2022-04-19 | 2022-08-16 | 杭州正元齿轮制造有限公司 | Forging forming process for triple gear |
| CN115213641B (en) * | 2022-07-29 | 2024-03-19 | 中国第一汽车股份有限公司 | Method for machining transmission input shaft |
| CN116550912B (en) * | 2023-07-07 | 2023-10-03 | 邯郸峰驰精密制造有限公司 | Automatic blanking-cutting head-thermal straightening all-in-one system for heavy-duty shaft wedge cross rolling |
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| CN202646329U (en) * | 2012-06-30 | 2013-01-02 | 浙江大发齿轮有限公司 | Automobile transmission input shaft |
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Effective date of registration: 20231116 Address after: 221400 plant 4, smart grid industrial park, Qiongjiang West Road, Xinyi City, Xuzhou City, Jiangsu Province Applicant after: Kunhao Electronic Technology (Jiangsu) Co.,Ltd. Address before: No. 2, Industrial Park, Development Zone, Anqing City, Anhui Province, 246000, Area 10 (Jingba Road) Applicant before: Anqing Zhenfa Auto Forging Co.,Ltd. |
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