CN106119473A

CN106119473A - Fork shaft moves heating immersion oil flash quenching method

Info

Publication number: CN106119473A
Application number: CN201610739225.8A
Authority: CN
Inventors: 张银凤; 李哲; 张冰; 王丽
Original assignee: CNR Dalian Locomotive and Rolling Stock Co Ltd
Current assignee: CRRC Dalian Co Ltd
Priority date: 2016-08-28
Filing date: 2016-08-28
Publication date: 2016-11-16
Anticipated expiration: 2036-08-28
Also published as: CN106119473B

Abstract

The invention discloses a kind of fork shaft and move heating immersion oil flash quenching method, in the sensing heating of quenching oil ullage, flash quenching under oil rapidly of not lowering the temperature, i.e. heat and cool down the quenching technical combined together.The quench-hardened case that thickness is suitable, be reasonably distributed can be obtained, improve wear-resisting, fatigue resistance, and thoroughly solve the inertial mass problem of crackle.

Description

Fork shaft moves heating immersion oil flash quenching method

Technical field

The present invention relates to metal heat treatmet field.

Background technology

Fork shaft is one of strength member on locomotive, and it is used for transmitting moment of torsion, and working condition is severe, it is desirable to have high wear-resisting Property, high fatigue strength and anti-brittle break ability, the most once the design medium-sized spline of shallow slot, occur fatigue equivalent and fracture existing As, improved structure was designed to deep trouth heavy type spline later, and its keyway number is increased to 16 by 6, and groove depth is increased to by 7 millimeters 8.5 millimeters, such bearing capacity improves, but brings crack problem to mid frequency induction hardening.For solving this long-term inertia mass Problem, we once carried out test and improved, but can not thoroughly eliminate hardening flaw and make fork shaft polyvinyl alcohol medium frequency induction hardening process Scrap problem.

My company just uses intermediate frequency to move the method adding the quenching of thermal jet polyvinyl alcohol at present, my company's medium frequency electric generating unit frequency F=8000HZ, by formula f optimal=250/m2KHZ, m is equivalent to 3.5 here, and therefore device frequency is on the low side in optimum frequency, this Sample root heating-up temperature is higher than top firing temperature, owing to polyvinyl alcohol applies quenching property on steel alloy Complex Parts unstable Fixed, the quenching stress so produced at the root that hardening heat is high is more than top quenching stress, and therefore crackle is first big at stress Root produce, and to top wedge angle extend.Because being rotary heating quenching, the therefore direct contact cooling in keyway side liquid, its Cooling rate is higher than opposite side, and the probability that the most fast cooling side crackle occurs is certainly more than opposite side.Though through various technique adjustment Improving, its crack number has reduced, but hardening flaw can not be eradicated.

Summary of the invention

Technical problem solved by the invention is to provide a kind of fork shaft and moves heating immersion oil flash quenching method,

The technical solution used in the present invention is, fork shaft moves heating immersion oil flash quenching method, and employing equipment includes quenching Fire groove, quenching tank is provided with quenching inducer, and quenching inducer is fixed on induction hardening transformer, quenching sense by middle transition plate Answering the lower surface of inducing conductor of device is that state of insulation is connected by brass screw, bakelite block with injection loop, and injection loop 7 soaks Entering below liquid level, the circumference of injection loop bores the nozzle opening of a group, quenching tank is provided with at least twice overflow launder, the face of overflow launder The long-pending area more than injection loop, also includes that the shifting axle of vertical direction, fork shaft to be processed are fixed on shifting axle；

Under the drive of shifting axle, fork shaft to be processed is from top to bottom through the central through hole of quenching inducer, quenching sensing Device energising is positioned at the part of inducing conductor and heats fork shaft, and fork shaft gradually moves down and lower end is first gradually immersed into quenching Groove quenches, and nozzle opening carries out oil spout and promotes liquid flowing in quenching tank；Fork shaft persistently moves down, and heats and enters with quenching simultaneously OK, until fork shaft is completely into quenching tank.

Described quenching inducer is higher than quenching oil liquid level 10mm-20mm.

Inducing conductor leads to cooling circulating water, to ensure the cooling of quenching inducer in heating process.

The invention has the beneficial effects as follows, utilize this to move the fork shaft of heating immersion oil flash quenching method quenching, can obtain Obtain the quench-hardened case that thickness is suitable, be reasonably distributed, improve wear-resisting, fatigue resistance, and the inertia mass thoroughly solving crackle is asked Topic.

Accompanying drawing explanation

Fig. 1 is fork shaft structure chart.

Fig. 2 is present configuration schematic diagram.

Fig. 3 is injection loop structure chart.

Figure is labeled as: 1-quenching inducer, 2-shifting axle, 3-induction hardening transformer, 4-inducing conductor, 7-injection loop, 71- Nozzle opening, 8-quenching tank, 9-fork shaft.

Detailed description of the invention

The invention will be further described below in conjunction with the accompanying drawings.

Patent of the present invention is achieved in that and carries out sensing heating at quenching oil ullage, does not lowers the temperature, moves down into rapidly The lower flash quenching of oil, i.e. heats and cools down the quenching technical synchronizing to carry out that combines together.

Quenching inducer 1 is connected with induction hardening transformer 3 by middle transition plate, and quenching inducer 1 is fixed on quenching Certain altitude above groove.Brass screw, bakelite block are passed through with injection loop 7 in insulation shape in the lower surface of the inducing conductor 4 of induction apparatus State is connected, and inducing conductor 4 leads to cooling circulating water, to ensure the cooling of induction apparatus in heating process；Injection loop 7 immersed in liquid level Hereinafter, the circumference of injection loop 7 bores a number of nozzle opening 71 and sprays oil, accelerate the circulation of quenching oil, to improve workpiece That is to say rate of cooling and the cooling uniformity of fork shaft 9.Quenching tank 8 designs a plurality of long slit overflow launder, this overflow launder Area be far longer than the area of injection loop, therefore fuel head remains in heating quenching process and mixes up fixing height in advance Degree, this ensure that quenching quality.The lower surface of quenching inducer 1 is very important with being accurately positioned of pasta, such as fruit oil Face raises and enters in induction apparatus, affects heats；If pasta reduces the time lengthening making workpiece enter injection loop, make quenching Temperature reduces too many, affects quenching effect.

The fork shaft of the present invention moves heating immersion oil flash quenching method, in the sensing heating of quenching oil ullage, does not drops Temperature flash quenching under oil rapidly, i.e. heats and cools down the quenching technical combined together.Can obtain that thickness is suitable, be reasonably distributed Quench-hardened case, improve wear-resisting, fatigue resistance, and thoroughly solve the inertial mass problem of crackle.

Claims

1. fork shaft moves heating immersion oil flash quenching method, and employing equipment includes quenching tank, and quenching tank is provided with quenching sense Answering device (1), quenching inducer (1) is fixed on induction hardening transformer (3) by middle transition plate, and the inducing of quenching inducer (1) is led The lower surface of body (4) is connected in state of insulation with injection loop (7) by brass screw, bakelite block, and injection loop (7) immerses liquid Below face, the circumference of injection loop (7) boring the nozzle opening (71) of a group, quenching tank (8) is provided with at least twice overflow launder, overflow The area of groove, more than the area of injection loop, also includes the shifting axle (2) of vertical direction, and fork shaft to be processed (9) is fixed on movement On axle (2)；

Under the drive of shifting axle (2), fork shaft to be processed (9) is from top to bottom through the central through hole of quenching inducer 1, quenching Induction apparatus (1) energising is positioned at the part of inducing conductor (4) and heats fork shaft (9), fork shaft (9) gradually move down and under End is first gradually immersed into quenching tank and quenches, and nozzle opening carries out oil spout and promotes liquid flowing in quenching tank；Fork shaft (9) persistently under Move, heat and carry out, until fork shaft (9) is completely into quenching tank with quenching simultaneously.

2. fork shaft as claimed in claim 1 moves heating immersion oil flash quenching method, it is characterised in that: described quenching sensing Device (1) is higher than quenching oil liquid level 10mm-20mm.

3. fork shaft as claimed in claim 1 moves heating immersion oil flash quenching method, it is characterised in that: inducing conductor (4) Logical cooling circulating water, to ensure the cooling of quenching inducer in heating process (1).