CN108869560B - Universal joint fork - Google Patents
Universal joint fork Download PDFInfo
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- CN108869560B CN108869560B CN201810996954.0A CN201810996954A CN108869560B CN 108869560 B CN108869560 B CN 108869560B CN 201810996954 A CN201810996954 A CN 201810996954A CN 108869560 B CN108869560 B CN 108869560B
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- hole
- spline
- fork
- blank
- spline hole
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- 238000005242 forging Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000004140 cleaning Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 16
- 238000003801 milling Methods 0.000 claims description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 12
- 230000002265 prevention Effects 0.000 claims description 12
- 239000006247 magnetic powder Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 claims description 3
- 230000005347 demagnetization Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000005415 magnetization Effects 0.000 claims description 3
- 229910001562 pearlite Inorganic materials 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
-
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a universal joint fork, which comprises a body, wherein one end of the body is provided with a pair of fork legs, one end of the body, which is far away from the fork legs, is provided with lugs, the body is also provided with a spline hole and a smooth hole, the spline hole and the smooth hole are coaxial with the body, the spline hole and the smooth hole are coaxially communicated and penetrate through the body, the spline hole is positioned at one end of the lugs, the smooth hole is positioned at one end of the fork legs, the pair of fork legs are provided with bearing holes, the bearing holes are coaxial and perpendicular to the spline holes, the inner sides of the fork legs are provided with widened fork openings, the outer sides of the fork legs are provided with step surfaces, and the step surfaces are perpendicular to the bearing holes; the lug is provided with a threaded hole, one end of the threaded hole penetrates through the end face of the lug, the other end of the threaded hole is coaxially connected with a counter bore, and one end, far away from the threaded hole, of the counter bore penetrates through the other end face of the lug; the threaded hole and the counter bore are perpendicular to the spline hole, the body is further provided with a groove, the groove is parallel to the axis of the body, one end of the groove, which is close to the fork leg, is provided with an arc hole, and the groove is communicated with the spline hole and the unthreaded hole.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to a universal joint fork.
Background
The steering system of the automobile is a key system for controlling the running direction of the automobile, and belongs to a safety part in automobile parts, wherein a universal joint fork is a key part for connecting a steering wheel rotating shaft and a steering gear, has the functions of transmitting torque and rotating speed, continuously bears alternating load of positive and negative rotation in operation, and can cause the automobile to run away once the universal joint fork fails, and the accident of destroying the automobile and causing death of the automobile, so that the structural design and the production process method of the universal joint fork used in the steering system are focused on safety, and the weight of products is reduced as much as possible.
Disclosure of Invention
The invention aims to provide a universal joint fork which has the advantages of good surface quality, light weight, no stress concentration, stable performance and high reliability, and solves the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the universal joint fork comprises a body 1, a pair of fork legs 2 are arranged at one end of the body 1, lugs 5 are arranged at one end, far away from the fork legs 2, of the body 1, spline holes 4 and unthreaded holes 6 are further arranged on the body 1, the spline holes 4 and the unthreaded holes 6 are coaxial with the body 1, the spline holes 4 and the unthreaded holes 6 are coaxially communicated and penetrate through the body 1, the spline holes 4 are positioned at one end of the lugs 5, the unthreaded holes 6 are positioned at one end of the fork legs 2, bearing holes 3 are respectively arranged on the pair of fork legs 2, the bearing holes 3 are coaxial and perpendicular to the spline holes 4, widened fork openings 201 are formed in the inner sides of the fork legs 2, step faces 202 are arranged on the outer sides of the fork legs 2, and the step faces 202 are perpendicular to the bearing holes 3; the lug 5 is provided with a threaded hole 10, one end of the threaded hole 10 penetrates through the end face of the lug 5, the other end of the threaded hole 10 is coaxially connected with a counter bore 9, and one end, far away from the threaded hole 10, of the counter bore 9 penetrates through the other end face of the lug 5; the threaded hole 10 and the counter bore 9 are perpendicular to the spline hole 4, a groove 8 is further formed in the body 1, the groove 8 is parallel to the axis of the body 1, an arc hole 7 is formed in one end, close to the fork leg 2, of the groove 8, and the groove 8 is communicated with the spline hole 4 and the light hole 6.
Through the arrangement, the body 1 is of a hollow structure, so that on one hand, the position of the spline shaft of the object is convenient to adjust during installation, the steering system has an optimal matching state, on the other hand, the weight of a product is reduced, the weight of the whole vehicle is reduced, and the energy consumption is reduced; the tail part of the groove 8 is provided with an arc hole 7, so that the spline of the spline hole is easily clamped on a spline shaft of an object part during assembly, the phenomenon of stress concentration is avoided, early failure is prevented from occurring under the action of alternating load in the use process, and the safety of the steering system is improved; the spline hole 4 is positioned at one end of the lug 5, and when the spline is assembled, the spline can be easily clamped on the spline shaft of the object by screwing the bolt into the threaded hole 10 through the counter bore 9 to a specified moment, and the spline is not connected by using a conventional nut and bolt, so that the number of spare parts is reduced, and the reliability is improved.
Further, the groove 8 and the bearing hole 3 have an included angle 11, and the included angle 11 is 87.06-88.06 degrees.
Through the arrangement, the direction of the included angle is staggered with the direction of the tangential force during use, so that superposition is avoided, stress superposition is prevented, the reliability of the universal joint fork is improved, and the use safety is ensured.
A method of manufacturing a universal joint fork comprising the steps of:
a. sawing phi 32 raw material into blanks with the length of 110 mm; the blanking with the specification breaks through the conventional requirement that the length-diameter ratio is smaller than 3 in the prior art, reduces the length-pulling procedure in the conventional forging process, saves energy sources, is beneficial to keeping the streamline and the product structure consistent after the universal joint fork is formed, and is beneficial to improving the performance and the reliability of the universal joint fork;
b. heating the blank rapidly for 8-12 seconds by adopting an induction heating method to enable the temperature of the blank to reach 1100-1150 ℃; by the method, the blank heating speed is high, the formed oxide skin amount is small, the material consumption loss is reduced, the metal materials are saved, and the production efficiency is improved;
c. the heated blank is put into an upsetting die to be upsetted, oxide skin generated during heating is primarily removed, the blank is upsetted to the height of 98-100mm, and compressed air is continuously sprayed to the blank and the die during upsetting; by adopting the upsetting standard, on one hand, the bending of the blank is prevented, the oxide skin generated during heating is removed in the other direction, the dropped oxide skin is blown away in time, the blank and the die are kept clean, and the dropped oxide skin is prevented from being pressed into the blank to form waste products;
d. placing one end of the upsetted blank on a tongue-shaped working surface 13 between tongue-shaped split die tables 12, and stretching the end of the blank to 34-36mm for blank making; by adopting the method, on one hand, part of the blank which is to form the fork leg 2 in the subsequent forming process is widened, the subsequent forming of the fork leg 2 is facilitated, and meanwhile, the tongue-shaped working surface 13 is an arc surface with smooth transition, so that the blank can be prevented from being folded in the subsequent forming of the fork leg 2;
e. the blank after blank making is quickly passed through high-pressure jet flow to further remove surface oxide skin and prevent the temperature of blank from reducing; by the method, on one hand, the formability of the blank in the subsequent forming processing is ensured, the damage of a die is prevented, and the surface quality after forming is good;
f. placing the blank after the oxide skin is cleaned into a pre-forging die of a 250-ton controlled electric screw press for pre-forming, wherein the thickness of the pre-forging is 1-1.5 mm thicker than that of the final forging; by the method, the fork feet 2 are filled fully, the deformation degree during final forging forming is reduced, and the die is protected;
g. placing the pre-forging piece into a final forging die of a 400-ton controlled electric screw press for final forming, taking out the final forging piece, placing the final forging piece on an iron grid net, and carrying out forced air cooling by using an axial flow fan to uniformly and rapidly cool the final forging piece to obtain a uniform pearlite structure, and preparing the structure for subsequent flaw detection and heat treatment;
h. cleaning the surface of the cooled workpiece by using a powerful shot blasting machine; the method is used for preparing the subsequent fluorescent flaw detection, the clean surface is beneficial to improving the resolution ratio of fluorescent magnetic powder flaw detection and preventing interference;
i. performing fluorescent magnetic powder inspection on the forge piece after finishing surface cleaning within 3 hours, and polishing the detected surface defects to prevent product rejection caused by defect expansion in subsequent heat treatment;
j. sending the flaw detection finished product into a gas protection continuous mesh belt furnace for quenching and tempering, and controlling the surface decarburization layer of the product to be not more than 0.15mm; by the method, the strength of the universal joint fork is not reduced, and the reliability of the universal joint fork is improved.
k. After the heat treatment is finished, a powerful shot blasting machine is used for cleaning the surface; the method is used for removing impurities attached to the surface of the universal joint fork after heat treatment, so that preparation is made for subsequent fluorescent flaw detection, and the clean surface is beneficial to improving the resolution ratio during fluorescent magnetic powder flaw detection and preventing interference phenomenon;
carrying out fluorescent magnetic powder inspection on the forge piece after finishing surface cleaning within 3 hours, and confirming the surface quality again; by the method, defective products are prevented from entering a subsequent processing procedure, so that loss of subsequent processing is reduced, and the reliability of the universal joint fork is further improved;
m, placing the flaw detection finished product into a coining die of a 500-ton hydraulic press for cold coining treatment; by the method, the dimensional accuracy of the universal joint fork is further improved, the subsequent machining positioning is facilitated, and the quality consistency of machined products is improved;
n, carrying out rust prevention treatment on the thin-layer rust prevention oil for the cold-coined universal joint fork; the universal joint fork is not rusted in the processing process by the method, so that the quality of the product is improved and maintained;
o, positioning bottom holes of the pre-drilled spline holes 4 and the smooth holes 6 by the outer circle of the body 1 and the end parts of the fork legs 2;
p, positioning the excircle of the body 1 and the end parts of the fork legs 2 on a numerical control lathe, finish turning the bottom hole of the spline hole 4 with a same cutter, finishing the final machining of the unthreaded hole 6, and machining the end face of the spline hole 4 of the body 1;
r, positioning and clamping the bottom hole of the spline hole 4, the end surface of the spline hole and the fork leg 2 for one time, drilling and reaming the bearing hole 3 with a cutter on a numerical control machining center, milling a step surface 202 by adopting two coaxially installed three-face milling cutters, and milling a fork opening 201 by adopting two coaxially installed forming milling cutters; by the method, the processing of the related dimensional characteristics is completed through one-time clamping, so that the product quality is guaranteed, the clamping frequency is reduced, and the production efficiency is improved;
s, taking the bearing hole 3 as a positioning part, and pulling out a spline hole 4 on the three-dimensional broaching machine; by the method, the perpendicularity precision of the bearing hole 3 and the spline hole 4 is guaranteed during processing;
t, positioning by using the spline hole 4 and the end face thereof, drilling the bottom holes of the counter bore 9 and the threaded hole 10, and completing tapping of the threaded hole 10; by the method, the processing of the related dimensional characteristics is completed through one-time clamping, so that coaxiality of the counter bore 9 and the threaded hole 10 is guaranteed, interference between bolts and counter bore walls during assembly is prevented, clamping times are reduced, and production efficiency is improved;
u, positioning and processing an arc hole 7 by using the bearing hole 3 and the spline hole 4;
v, positioning by using the bearing hole 3 and the spline hole 4, wherein the milling groove 8 is communicated with the circular arc hole 7, the spline hole 4 and the unthreaded hole 6, and the included angle 11 is ensured to be 87.06-88.06 degrees;
w, placing the product into an ultrasonic cleaner for cleaning, removing oil and impurities, and performing rust prevention treatment;
and x, passing the steel central conductor through the spline hole 4 and the unthreaded hole 6 to perform magnetization fluorescent flaw detection and demagnetization on the universal joint fork. By the method, the surface quality of the universal joint fork is further confirmed, products with folding cracks are prevented from leaving factories, and the reliability of the universal joint fork is further improved;
y, placing the product into an ultrasonic cleaner for cleaning, removing magnetic powder attached to the part, and performing rust prevention treatment; by the method, the surface of the universal joint fork is kept clean, and the coating quality after assembly is ensured.
Further, the high-pressure jet in the step e is a high-pressure water jet. Through the arrangement, the high-pressure water jet pressure is high in flow speed, impact force on oxide skin on the surface of the blank is large, stripping effect is good, residence time on the surface of the blank is extremely short, temperature of the blank cannot be reduced, and subsequent forging forming is facilitated.
The invention has the beneficial effects that: the universal joint fork provided by the invention is manufactured through reasonable structural design and strict process flow, and has the advantages of good surface quality, light weight, no stress concentration, stable performance and high reliability.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a section A-A of fig. 1.
Fig. 4 is a sectional view B-B of fig. 1.
Fig. 5 is a front view of the tongue-shaped split die table structure of the present invention.
Fig. 6 is a right side view of the tongue-shaped split die table structure of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, a universal joint fork comprises a body 1, wherein one end of the body 1 is provided with a pair of fork legs 2, one end of the body 1 far away from the fork legs 2 is provided with a lug 5, the body 1 is also provided with a spline hole 4 and a smooth hole 6, the spline hole 4 and the smooth hole 6 are coaxial with the body 1, the spline hole 4 and the smooth hole 6 are coaxially communicated and penetrate through the body 1, the spline hole 4 is positioned at one end of the lug 5, the smooth hole 6 is positioned at one end of the fork legs 2, the pair of fork legs 2 are provided with bearing holes 3, the bearing holes 3 are coaxial and perpendicular to the spline holes 4, the inner side of the fork legs 2 is provided with widened fork openings 201, the outer side of the fork legs 2 is provided with a step surface 202, and the step surface 202 is perpendicular to the bearing holes 3; the lug 5 is provided with a threaded hole 10, one end of the threaded hole 10 penetrates through the end face of the lug 5, the other end of the threaded hole 10 is coaxially connected with a counter bore 9, and one end, far away from the threaded hole 10, of the counter bore 9 penetrates through the other end face of the lug 5; the threaded hole 10 and the counter bore 9 are perpendicular to the spline hole 4, the body 1 is further provided with a groove 8, the groove 8 is parallel to the axis of the body 1, one end, close to the fork leg 2, of the groove 8 is provided with an arc hole 7, and the groove 8 is communicated with the spline hole 4 and the unthreaded hole 6.
Preferably, the groove 8 and the bearing hole 3 have an included angle 11, and the included angle 11 is 87.06-88.06 degrees.
A method of manufacturing a universal joint fork comprising the steps of:
a. sawing phi 32 raw material into blanks with the length of 110 mm;
b. heating the blank rapidly for 8-12 seconds by adopting an induction heating method to enable the temperature of the blank to reach 1100-1150 ℃;
c. the heated blank is put into an upsetting die to be upsetted, oxide skin generated during heating is primarily removed, the blank is upsetted to the height of 98-100mm, and compressed air is continuously sprayed to the blank and the die during upsetting;
d. placing one end of the upsetted blank on a tongue-shaped working surface 13 between tongue-shaped split die tables 12, and stretching the end of the blank to 34-36mm for blank making;
e. the blank after blank making is quickly passed through high-pressure jet flow to further remove surface oxide skin and prevent the temperature of blank from reducing;
f. placing the blank after the oxide skin is cleaned into a pre-forging die of a 250-ton controlled electric screw press for pre-forming, wherein the thickness of the pre-forging is 1-1.5 mm thicker than that of the final forging;
g. placing the pre-forging piece into a final forging die of a 400-ton controlled electric screw press for final forming, taking out the final forging piece, placing the final forging piece on an iron grid net, and carrying out forced air cooling by using an axial flow fan to uniformly and rapidly cool the final forging piece to obtain a uniform pearlite structure, and preparing the structure for subsequent flaw detection and heat treatment;
h. cleaning the surface of the cooled workpiece by using a powerful shot blasting machine;
i. performing fluorescent magnetic powder inspection on the forge piece after finishing surface cleaning within 3 hours, and polishing the detected surface defects to prevent product rejection caused by defect expansion in subsequent heat treatment;
j. sending the flaw detection finished product into a gas protection continuous mesh belt furnace for quenching and tempering, and controlling the surface decarburization layer of the product to be not more than 0.15mm;
k. after the heat treatment is finished, a powerful shot blasting machine is used for cleaning the surface;
carrying out fluorescent magnetic powder inspection on the forge piece after finishing surface cleaning within 3 hours, and confirming the surface quality again;
m, placing the flaw detection finished product into a coining die of a 500-ton hydraulic press for cold coining treatment;
n, carrying out rust prevention treatment on the thin-layer rust prevention oil for the cold-coined universal joint fork;
o, positioning bottom holes of the pre-drilled spline holes 4 and the smooth holes 6 by the outer circle of the body 1 and the end parts of the fork legs 2;
p, positioning the excircle of the body 1 and the end parts of the fork legs 2 on a numerical control lathe, finish turning the bottom hole of the spline hole 4 with a same cutter, finishing the final machining of the unthreaded hole 6, and machining the end face of the spline hole 4 of the body 1;
r, positioning and clamping the bottom hole of the spline hole 4, the end surface of the spline hole and the fork leg 2 for one time, drilling and reaming the bearing hole 3 with a cutter on a numerical control machining center, milling a step surface 202 by adopting two coaxially installed three-face milling cutters, and milling a fork opening 201 by adopting two coaxially installed forming milling cutters;
s, taking the bearing hole 3 as a positioning part, and pulling out a spline hole 4 on the three-dimensional broaching machine;
t, positioning by using the spline hole 4 and the end face thereof, drilling the bottom holes of the counter bore 9 and the threaded hole 10, and completing tapping of the threaded hole 10;
u, positioning and processing an arc hole 7 by using the bearing hole 3 and the spline hole 4;
v, positioning by using the bearing hole 3 and the spline hole 4, wherein the milling groove 8 is communicated with the circular arc hole 7, the spline hole 4 and the unthreaded hole 6, and the included angle 11 is ensured to be 87.06-88.06 degrees;
w, placing the product into an ultrasonic cleaner for cleaning, removing oil and impurities, and performing rust prevention treatment;
x, enabling the steel central conductor to pass through the spline hole 4 and the unthreaded hole 6 to carry out magnetization fluorescent flaw detection and demagnetization on the universal joint fork;
and y, placing the product into an ultrasonic cleaner for cleaning, removing magnetic powder remained on the part, and performing rust prevention treatment.
Preferably, the high pressure jet in step e is a high pressure water jet.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A manufacturing method of a universal joint fork, the universal joint fork comprises a body (1), a pair of fork legs (2) are arranged at one end of the body (1), a lug (5) is arranged at one end, far away from the fork legs (2), of the body (1), a spline hole (4) and a light hole (6) are also arranged on the body (1), the spline hole (4) and the light hole (6) are coaxial with the body (1), the spline hole (4) and the light hole (6) are coaxially communicated and penetrate through the body (1), the spline hole (4) is positioned at one end of the lug (5), the light hole (6) is positioned at one end of the fork legs (2), a pair of bearing holes (3) are arranged on the fork legs (2), the bearing holes (3) are coaxial and are perpendicular to the spline hole (4), widened fork openings (201) are formed in the inner sides of the fork legs (2), step surfaces (202) are arranged on the outer sides of the fork legs (2), and the step surfaces (202) are perpendicular to the bearing holes (3); the lug (5) is provided with a threaded hole (10), one end of the threaded hole (10) penetrates through the end face of the lug (5), the other end of the threaded hole (10) is coaxially connected with a counter bore (9), and one end, far away from the threaded hole (10), of the counter bore (9) penetrates through the other end face of the lug (5); the threaded hole (10) and the counter bore (9) are perpendicular to the spline hole (4), a groove (8) is formed in the body (1), the groove (8) is parallel to the axis of the body (1), an arc hole (7) is formed in one end, close to the fork leg (2), of the groove (8), and the groove (8) is communicated with the spline hole (4) and the light hole (6); the groove (8) and the bearing hole (3) are provided with an included angle (11), and the included angle (11) is 87.06-88.06 degrees, and is characterized by comprising the following steps:
a. sawing phi 32 raw material into blanks with the length of 110 mm;
b. heating the blank rapidly for 8-12 seconds by adopting an induction heating method to enable the temperature of the blank to reach 1100-1150 ℃;
c. the heated blank is put into an upsetting die to be upsetted, oxide skin generated during heating is primarily removed, the blank is upsetted to the height of 98-100mm, and compressed air is continuously sprayed to the blank and the die during upsetting;
d. placing one end of the upsetted blank on a tongue-shaped working surface (13) between tongue-shaped split die tables (12), and widening the end of the blank to 34-36mm for blank making;
e. the blank after blank making is quickly passed through high-pressure jet flow to further remove surface oxide skin and prevent the temperature of blank from reducing;
f. placing the blank after the oxide skin is cleaned into a pre-forging die of a 250-ton controlled electric screw press for pre-forming, wherein the thickness of the pre-forging is 1-1.5 mm thicker than that of the final forging;
g. placing the pre-forging piece into a final forging die of a 400-ton controlled electric screw press for final forming, taking out the final forging piece, placing the final forging piece on an iron grid net, and carrying out forced air cooling by using an axial flow fan to uniformly and rapidly cool the final forging piece to obtain a uniform pearlite structure, and preparing the structure for subsequent flaw detection and heat treatment;
h. cleaning the surface of the cooled workpiece by using a powerful shot blasting machine;
i. performing fluorescent magnetic powder inspection on the forge piece after finishing surface cleaning within 3 hours, and polishing the detected surface defects to prevent product rejection caused by defect expansion in subsequent heat treatment;
j. sending the flaw detection finished product into a gas protection continuous mesh belt furnace for quenching and tempering, and controlling the surface decarburization layer of the product to be not more than 0.15mm;
k. after the heat treatment is finished, a powerful shot blasting machine is used for cleaning the surface;
carrying out fluorescent magnetic powder inspection on the forge piece after finishing surface cleaning within 3 hours, and confirming the surface quality again;
m, placing the flaw detection finished product into a coining die of a 500-ton hydraulic press for cold coining treatment;
n, carrying out rust prevention treatment on the thin-layer rust prevention oil for the cold-coined universal joint fork;
o, positioning bottom holes of the pre-drilled spline holes (4) and the unthreaded holes (6) by using the outer circle of the body (1) and the end parts of the fork legs (2);
p, positioning the excircle of the body (1) and the end parts of the fork legs (2) on a numerical control lathe, finish turning the bottom hole of the spline hole (4) with a cutter, finishing the final machining of the unthreaded hole (6), and machining the end face of the spline hole (4) of the body (1);
r, positioning and clamping the bottom hole of the spline hole (4) and the end surface thereof as well as the fork feet (2) for one time, drilling and reaming the bearing hole (3) on the numerical control machining center by a same cutter, milling a step surface (202) by adopting two three-edge milling cutters which are coaxially arranged, and milling a fork opening (201) by adopting two forming milling cutters which are coaxially arranged;
s, taking the bearing hole (3) as a positioning part, and pulling out a spline hole (4) on the three-dimensional broaching machine;
t, positioning by using the spline hole (4) and the end face thereof, drilling the bottom holes of the counter bore (9) and the threaded hole (10), and completing tapping of the threaded hole (10);
u, positioning and processing the circular arc hole (7) by the bearing hole (3) and the spline hole (4);
v, positioning by using a bearing hole (3) and a spline hole (4), milling a groove (8), communicating with an arc hole (7), the spline hole (4) and a light hole (6), and ensuring that an included angle (11) is 87.06-88.06 degrees;
w, placing the product into an ultrasonic cleaner for cleaning, removing oil and impurities, and performing rust prevention treatment;
x, enabling the steel central conductor to pass through the spline hole (4) and the unthreaded hole (6) to carry out magnetization fluorescent flaw detection and demagnetization on the universal joint fork;
and y, placing the product into an ultrasonic cleaner for cleaning, removing magnetic powder remained on the part, and performing rust prevention treatment.
2. A method of manufacturing a yoke as defined in claim 1, wherein: the high-pressure jet in the step e is a high-pressure water jet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996954.0A CN108869560B (en) | 2018-08-29 | 2018-08-29 | Universal joint fork |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810996954.0A CN108869560B (en) | 2018-08-29 | 2018-08-29 | Universal joint fork |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108869560A CN108869560A (en) | 2018-11-23 |
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| CN1194892A (en) * | 1998-04-23 | 1998-10-07 | 南京标准件厂 | Steel plate cold stamping shaped universal-joint yoke and making method thereof |
| CN2407174Y (en) * | 1999-11-19 | 2000-11-22 | 乐清市联轴器厂 | Spline pair for cross axle style universal coupler |
| CN103341740A (en) * | 2013-05-31 | 2013-10-09 | 山东金马工业集团股份有限公司 | Method for preparing electric power steering system hot precision forging section fork |
| CN203979181U (en) * | 2014-01-20 | 2014-12-03 | 永嘉县正菱精密锻造有限公司 | A kind of universal-joint fork |
| CN104985401A (en) * | 2015-07-06 | 2015-10-21 | 浙江美亚特精密机械有限公司 | Joint yoke machining method |
| CN107264614A (en) * | 2017-07-25 | 2017-10-20 | 徐州徐工矿山机械有限公司 | The axial fixing structure of quarry tipper steering column upper spline axle and spline housing |
| CN208651465U (en) * | 2018-08-29 | 2019-03-26 | 浙江正昌锻造股份有限公司 | A kind of universal-joint fork |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2822122B1 (en) * | 2001-03-14 | 2003-05-23 | Nacam | ASSEMBLY OF A STEERING COLUMN BRACKET WITH A DIRECTION PINION OF A MOTOR VEHICLE |
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- 2018-08-29 CN CN201810996954.0A patent/CN108869560B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1194892A (en) * | 1998-04-23 | 1998-10-07 | 南京标准件厂 | Steel plate cold stamping shaped universal-joint yoke and making method thereof |
| CN2407174Y (en) * | 1999-11-19 | 2000-11-22 | 乐清市联轴器厂 | Spline pair for cross axle style universal coupler |
| CN103341740A (en) * | 2013-05-31 | 2013-10-09 | 山东金马工业集团股份有限公司 | Method for preparing electric power steering system hot precision forging section fork |
| CN203979181U (en) * | 2014-01-20 | 2014-12-03 | 永嘉县正菱精密锻造有限公司 | A kind of universal-joint fork |
| CN104985401A (en) * | 2015-07-06 | 2015-10-21 | 浙江美亚特精密机械有限公司 | Joint yoke machining method |
| CN107264614A (en) * | 2017-07-25 | 2017-10-20 | 徐州徐工矿山机械有限公司 | The axial fixing structure of quarry tipper steering column upper spline axle and spline housing |
| CN208651465U (en) * | 2018-08-29 | 2019-03-26 | 浙江正昌锻造股份有限公司 | A kind of universal-joint fork |
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| CN108869560A (en) | 2018-11-23 |
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Denomination of invention: A type of universal joint fork Granted publication date: 20231219 Pledgee: Industrial Bank Co.,Ltd. Wenzhou Ruian sub branch Pledgor: ZHEJIANG ZHENGCHANG FORGING Co.,Ltd. Registration number: Y2024980010192 |