CN103418617A - Manufacturing process of taper sleeve used in wire mill - Google Patents

The invention discloses a manufacturing process of a taper sleeve used in a wire mill. The manufacturing process comprises the following process flows: performing die forging on a 40CrNiMoA material to manufacture blanks or purchasing forging blanks and checking the forging blanks; normalizing; roughly turning the outer circle, the inner hole and the end face and maintaining unilateral machining allowance of 4-6 mm; quenching and tempering, wherein the oil quenching temperature is 890+/-10 DEG C, and the tempering temperature is 590+10 DEG C; finely cutting the outer circle, the inner hole and the end face, wherein all the surface roughness reaches Ra1.6; performing surface quenching, wherein the hardness is 53-55 HRC; plating chromium on the surface; grinding to enable that the roughness of the outer circle and the end face reaches Ra0.8, the run-out tolerance of the outer circle is not greater than 0.025 and the coaxiality of the inner hole and the periphery of the taper sleeve is controlled to be phi 0.02 mm; checking the product size and appearance. The manufacturing process has the advantages of high stability performance, high reliability, capability of guaranteeing the precision of the taper sleeve, convenience in assembly and repair, high operability, high surface hardness, high wear resistance and contribution to prolonging the service life of the taper sleeve.

A kind of manufacture craft of the tapered sleeve for rod-rolling mill

Technical field

The present invention relates to a kind of rod-rolling mill accessory processing technology, be specifically related to the tapered sleeve manufacture craft for rod-rolling mill.

Background technology

In prior art, the rod-rolling mill tapered sleeve is for supporting and fixing collars, pack into the endoporus of collars of tapered sleeve, guarantee the shaft shoulder location of collars with roll mandrel during assembling, then by the dedicated hydraulic handling instrument by the cone-shaped inner hole tensioner of tapered sleeve between the roll mandrel and collars with tapering, roll collar inner hole and tapered sleeve cylindrical, tapered sleeve internal taper hole and roll shop building are the interference fit face.This tapered sleeve is in manufacturing process poor operability, poor reliability at present.Tapered sleeve and collars gap can not be adjusted, in process, machine tool accuracy, processing location, cutter and human factor impact are large, if tapered sleeve and collars interference fit are slightly large, can cause tapered sleeve axially to scratch and be difficult to mounting or dismounting, cause the tapered sleeve low precision, yielding, be not easy to assembling and maintenance, cause tapered sleeve to be scrapped in advance.

Summary of the invention

Technical problem for above-mentioned existence the objective of the invention is: proposed that a kind of case hardness is high, wearability is strong, be beneficial to the manufacture craft of the tapered sleeve for rod-rolling mill that extends its service life.

Technical solution of the present invention is achieved in that a kind of manufacture craft of the tapered sleeve for rod-rolling mill, it is characterized in that: comprise following technological process:

A, select the 40CrNiMoA material carry out the die forging base or the buying forging stock, then carry out the forging stock check;

B, normalized treatment;

C, rough turn cylindrical, endoporus, end face, stay monolateral allowance 4～6mm;

D, modifier treatment, the oil quenching temperature is 890 ± 10 ℃, temperature is 590 ± 10 ℃;

E, smart turning, endoporus, end face, all surfaces roughness reaches Ra1.6;

F, surface hardening, hardness is 53～55HRC;

G, chrome-faced;

H, grinding, cylindrical and surface roughness reach Ra0.8, and the excircle radical runout tolerance is not more than 0.025, and the axiality of tapered sleeve endoporus and periphery is controlled as ￠ 0.02mm;

I, check product size and outward appearance.

Due to the utilization of technique scheme, the present invention compared with prior art has following advantages:

Tapered sleeve for rod-rolling mill manufacture craft of the present invention, stability is good, and reliability is high, guarantees the tapered sleeve precision, is convenient to assembling and maintenance, workable and case hardness is high, wearability is strong, is beneficial to and extends its service life.

The accompanying drawing explanation

Below in conjunction with accompanying drawing, technical solution of the present invention is described further:

Accompanying drawing 1 is the fabrication processing of the tapered sleeve for rod-rolling mill figure of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing, the present invention is described.

Be a kind of manufacture craft of the tapered sleeve for rod-rolling mill of the present invention as shown in Figure 1, it is characterized in that: comprise following technological process:

A, select the 40CrNiMoA material carry out the die forging base or the buying forging stock, then carry out the forging stock check;

B, normalized treatment;

C, rough turn cylindrical, endoporus, end face, stay monolateral allowance 4～6mm;

D, modifier treatment, quenching and tempering hardness is 269-312HB, modulator approach is: workpiece is heated to 880 ℃ to 900 ℃, be incubated and ooze by force 3 hours after 30 minutes, carbon potential 0.4, then temperature is down to 860 ℃ of diffusions 10 minutes, carbon potential 0.4 is come out of the stove, oil quenching 600 seconds, wherein stir by force and within 500 seconds, stir slowly 100 seconds, carry out tempering after finally taking-up drains 200 seconds, 580 ℃ to 590 ℃ of temperatures, tempering time 2 hours, adopt modulation treatment to replace Quenching Treatment in the past, can increase the depth of quenching and carburizing carbon potential, after processing, surface of the work hardness is high, wearability is strong, be beneficial to and extend its service life,

E, smart turning, endoporus, end face, all surfaces roughness reaches Ra1.6;

F, surface hardening, hardness is 53～55HRC;

G, chrome-faced;

H, grinding, cylindrical and surface roughness reach Ra0.8, and the excircle radical runout tolerance is not more than 0.025, and the axiality of tapered sleeve endoporus and periphery is controlled as ￠ 0.02mm;

I, check product size and outward appearance.

Above-described embodiment is only explanation technical conceive of the present invention and characteristics; its purpose is to allow the person skilled in the art can understand content of the present invention and be implemented; can not limit the scope of the invention with this; all equivalences that Spirit Essence is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.

1. the manufacture craft of the tapered sleeve for rod-rolling mill is characterized in that: comprise following technological process:

Select the 40CrNiMoA material to carry out die forging base or buying forging stock, then carry out the forging stock check;

Normalized treatment;

Rough turn cylindrical, endoporus, end face, stay monolateral allowance 4～6mm;

Modifier treatment, the oil quenching temperature is 890 ± 10 ℃, temperature is 590 ± 10 ℃;

Essence turning, endoporus, end face, all surfaces roughness reaches Ra1.6;

Surface hardening, hardness is 53～55HRC;

Chrome-faced;

Grind, cylindrical and surface roughness reach Ra0.8, and the excircle radical runout tolerance is not more than 0.025, and the axiality of tapered sleeve endoporus and periphery is controlled as ￠ 0.02mm;

Check product size and outward appearance.