CN103624503A - Middle shaft machining technology - Google Patents

The invention discloses a middle shaft machining technology. The middle shaft machining technology comprises the steps of blanking, forging, isothermal normalizing, finish turning, tooth manufacturing, spline rubbing, hole drilling, heat treatment, straightening, external grinding, cleaning, finished product detecting, and packaging and storing, wherein the length of blanks is turned into 222.2-222.3mm in the step of finish turning. According to the technology, the length of the blanks is turned into 222.2-222.3mm before heat treatment, working allowance of secondary finish turning is not reserved, a workpiece is made to reach the requirements of the size and beats of a middle shaft only through one time of finish turning before the heat treatment, and secondary finish turning is not needed, so that the machining processes of the middle shaft are reduced, middle shaft machining time is shortened, the middle shaft machining progress is quickened, and production efficiency is improved.

Jackshaft processing technology

Technical field

The invention belongs to the technical field of driving parts processing.

Background technology

Jackshaft, is a power transmission shaft in automobile gearbox, and axle itself is integrated with gear, and effect is transmission campaign and power between power shaft and output shaft.The modal size in jackshaft two ends is 222.2mm, and the error of permission is ± 0.1mm, the position that both ends of the surface are bearing assemble, its size directly determines the reliability of positioning of axle in mission case, therefore in technical process, must guarantee size accurately.

Existing jackshaft processing technology is the technique that jackshaft is carried out to blanking, forging, normalizing, finish turning, tooth processed, rubs spline, boring, heat treatment, alignment and cylindrical grinding with the hands, again end face is carried out to finish turning afterwards, finally cleans, product inspection and packing warehouse-in.Because of when heat treatment, the deformation of jackshaft is difficult to estimate, jackshaft need to be through twice finish turning, before heat treatment, need to carry out finish turning for the first time, after Overheating Treatment, also need according to the actual conditions after heat treatment jackshaft workpiece finish turning again, the size of guarantee jackshaft reaches the requirement of final size.And finish turning jackshaft workpiece need to expend many time, affect the progress of jackshaft processing.

Summary of the invention

The invention provides a kind of jackshaft processing technology, to solve, need to carry out finish turning twice to jackshaft, cause jackshaft longer problem process time.

In order to solve the problems of the technologies described above, the invention provides following technical scheme: a kind of jackshaft processing technology, comprises the following steps:

A, blanking;

B, employing die forging mode turned blank;

C, isothermal normalizing;

D, blank is carried out to finish turning, it is the size of 222.2-222.3mm that blank finish turning is become to total length;

E, tooth processed;

F, stranding spline;

G, boring;

H, heat treatment;

I, alignment;

J, cylindrical grinding;

K, cleaning;

L, product inspection;

M, packing warehouse-in;

Compared with prior art, the invention has the advantages that: before heat treatment, blank finish turning is become to the length dimension of 222.2-222.3mm.Do not stay the allowance of finish turning for the second time, only need before heat treatment, as above state the requirement that just can make workpiece reach jackshaft size and beat after a finish turning heat treatment of size, guarantee that the size fluctuation of jackshaft is within the scope of 222.1-222.3mm, do not need to carry out finish turning again, reduced the operation of jackshaft processing, shorten the time of jackshaft processing, accelerated the progress of jackshaft processing.

Further, in described step e, staying shaving surplus is 0.05mm, makes it meet dimensional requirement.

Further, normalizing adopts isothermal normalizing, and the more common normalizing of isothermal normalizing can obtain microscopic structure and the hardness that uniformity needs.

the specific embodiment

A kind of jackshaft processing technology in the present embodiment, comprises the following steps:

A, blanking: adopt 20CrMnTiH-GB/T5216-200 material.

B, blank is forged: adopt die forging mode to process forging stock.

C, isothermal normalizing: isothermal normalizing hardness is 160～190HB.

D, finish turning: excircle dimension, need grinding position to stay grinding allowance 0.25mm, all the other are worked into finished size; Axial overall length is that 222.2-222.3 mm(finished size is 222.2 ± 0.1mm), all the other dimensioned are to finished size; The 0.02mm that beats of grinding position, alignment.

E, gear hobbing: adopt numerical control five-axle to roll gear shaving machine, with axle two ends centre bore location, ringfeder pull bar is connected with machine tool hydraulic cylinder, hydraulic cylinder piston moves downward the mode of ringfeder clamping circle product external and carries out clamping mode converted products; Stay shaving surplus 0.05mm(transverse tooth thickness direction, bilateral).

F, shaving: adopt numerical control gear shaving machine, according to product heat treatment deformation rule, teeth directional strengthens helix dip deviation 0.02mm, and transverse tooth thickness M value is pressed the processing of finished product lower limit.

G: rub spline with the hands: adopt precision to frustrate tooth machine GZ730, working (machining) efficiency is high, machining period approximately 18 seconds, transverse tooth thickness M value is pressed the processing of finished product lower limit, total cumulative pitch error is pressed 0.035mm and is controlled, and gear ring circular runout is pressed 0.03mm and controlled, and decile error adopts integrated spline ring gauge to control.

H, boring: adopt NC deep hole drilling machine DHE-500-4, can process 4 axles simultaneously, the disposable finished size that is machined to, and the axiality of the endoporus of processing and cylindrical can reach in 0.3mm.

I, heat treatment: adopt to like the special-purpose heat treatment tooling of association's woods equipment and customization, can effectively reduce the heat treated deflection of jackshaft, guaranteed precision after the heat of gear.

J, alignment: the gondola PAS/30(QP/GJT04-27-4024A that adopts import) automatic shaft straightener, this straightener efficiency is high, precision is high, can within the time of 15 seconds, beating of 3 place's alignment cylindricals be proofreaied and correct in 0.02mm, effectively guarantee specification requirement.

K, cylindrical grinding: adopt high-speed numeric control cylindrical grinder and CNC angular approach cylindrical grinding machine.High-speed numeric control cylindrical grinder can clamped one time completes the grinding of φ 20, φ 30 and φ 35 excircle dimensions, has reduced the number of times of jackshaft clamping, has shortened process time, has improved efficiency; End face numerical control external cylindrical grinding machine is with axial dimension automatic detection device, higher than the stability of machine tool.

L, cleaning: adopt supersonic wave cleaning machine, can effectively remove greasy dirt and other foreign material that surface of the work adheres to, immersion in liquid preventives functional oil can make workpiece can not produce the phenomenon of surface oxidisation in long-time simultaneously.

M, product inspection: the content of the size marking on product figure and specification requirement regulation is carried out to sampling Detection or inspection entirely, guarantee that workpiece meets design requirement completely.

N, packing warehouse-in: adopt special-purpose inner packaging box and extranal packing box to pack workpiece, prevent that in carrying and transportation, workpiece collides with mutually, guarantee again that extranal packing box can be not damaged easily simultaneously, prevent that workpiece is scattered.

The present embodiment has adopted some novel equipment to improve production efficiency.As adopt numerical control deep-hole to bore once to process 4 products, and lathe can only product of time processing in the past; simultaneously The time that gondola automatic shaft straightener completes a product is 15 seconds, and domestic straightener in the past needs the time of 30 seconds to 60 seconds; Adopt numerical control external cylindrical grinding machine can clamped one time to complete the grinding of a plurality of cylindricals, and can only clamped one time during plain external grinding machine batch production complete the grinding of a cylindrical, saved the spent time of clamping workpiece after adopting numerical control external cylindrical grinding machine.

Table 1 is the change in size of above-mentioned three sizes after the processing of e-m step

Table 1

The modal dimensional requirement of jackshaft is 222.2mm, and the error of permission is ± 0.1mm that the size of above-mentioned finished product all meets the requirements.

For a person skilled in the art, not departing under the prerequisite of structure of the present invention, can also make some distortion and improvement, these also should be considered as protection scope of the present invention, and these can not affect effect of the invention process and practical applicability.