CN101509062B

CN101509062B - Method for quenching end socket ribbet position of assembled camshaft

Info

Publication number: CN101509062B
Application number: CN2009100667048A
Authority: CN
Inventors: 姜波; 崔凯; 王宏
Original assignee: FAW Group Corp
Priority date: 2009-03-27
Filing date: 2009-03-27
Publication date: 2013-03-06
Anticipated expiration: 2029-03-27
Also published as: CN101509062A

Abstract

The invention relates to a method for quenching a notch part at the end of an assembled camshaft. The invention is characterized in that the method comprises the following steps: fastening a contact plate of a quenching inductor and a quenching transformer of a quenching machine together; placing the notches of parts downwards on the boss of a locating plate; pressing down a start button to allow an alternating current and the quenching inductor to form a circulating current via two polar plates of the quenching transformer, thus producing an induced current in the metal parts adjacent to active wires for heating the parts for 2 to 3 seconds; stopping heating when the parts are heated to a temperature 50 DEG C higher than the austenitizing temperature of the material; completely cooling for 5 seconds through water spraying; and finishing the quenching process of the parts by taking the parts down from the locating plate after cooling. The method can solve the problem with the distribution uniformity of effective hardening layers in induction quenching and reduce the heat penetration depth of the induced current; the method adopts the short-time rapid heating manner, thereby reducing the heat conduction time; the heat-affected zone (HAZ) of the parts is reduced; and the quenching inductor has the advantages of simple structure, short process time and high production efficiency.

Description

Method for quenching end socket ribbet position of assembled camshaft

Technical field:

The present invention relates to a kind of method for quenching end socket ribbet position of assembled camshaft.

Background technology:

In Hyundai Motor is made, the assembled cam shaft of engine is one of more advanced technology, the effect of plug-in type shaft coupling is played in the termination in camshaft assembly, the notch place of part withstands shocks and rubs in the work, according to its working conditions and service condition, in manufacturing processed, require the both sides of notch to have higher hardness raising wear resistance and intensity, need to carry out induction quenching and strengthen.This part requires to carry out induction quenching in the notch both sides of wide 8mm, height 8.5mm, because the space at quenching position is very little, the layout of the active wires of inductor block in notch is very difficult; Be subject to the restriction of part shape and size, the location difficulty of part; Because the size of part is little, thermal capacity is also little, obtain the effective hardened layer difficulty of the equally distributed induction quenching in notch both sides very large.

In view of above difficult point, with the notch type parts quenching inductor block of traditional form, realize the induction quenching of this part, and it is very difficult to obtain meeting the qualified part that the induction quenching technology of product drawing regulation requires.

Summary of the invention:

The object of the present invention is to provide a kind of method for quenching end socket ribbet position of assembled camshaft, 1. it use novel inductor newly developed and rational processing parameter, the induction quenching quality of this part reaches the induction quenching technology requirement of product drawing regulation, satisfies use properties; 2. inductor block is simple in structure, and the process time is short, and production efficiency is high; 3. solved the problem of this part location difficulty and effective hardened layer distributing homogeneity with simple method; 4. the employed novel inductor of this part induction quenching can be applied in the induction quenching of like parts.

Technical scheme of the present invention is achieved in that method for quenching end socket ribbet position of assembled camshaft, it is characterized in that: its concrete technology step is as follows: (A) contact plate of the quenching inducer induction hardening transformer with quenching machine is tightened together; Guaranteeing under the unobstructed condition in water coolant and quenching water route, be placed on the part notch on the strongback downwards, this strongback be the width that the thick copper sheet of the 6mm with the magnetic action of keeping away processes be 7.9mm, highly for the boss of 1mm as positioning table, the notch of part is sitting on the boss, the upper-lower position of limit feature, be the position of limit feature along active wires, to make two for the thick polyfluortetraethylene plate of 1mm of strongback and active wires insulation and heat-resisting function, the centre reserves the position and places part; The gap of active wires and two sides of notch is evenly at 1mm; (B) at this moment, press start button, exchange current is by two pole plates and inductor block formation circulation of induction hardening transformer, under the effect in the magnetic field that this exchange current produces, make to produce induced current (eddy current) near the metal parts that is placed on the active wires and make the part heating, be 2-3 second heat-up time, selects the higher induction heating power of frequency, be that frequency is that 200kHz, power are 100kW mosfet transistor power supply, reduce the thermoelectric current penetration depth; (C) when part is heated to above 50 ℃ of the austenitizing temperatures of material, stopped heating, and spray water immediately by the water-jet that is welded in the active wires both sides; The rectangle water-jet of two positioned opposite is welded on the excessive wire of active wires both sides, makes the notch that is sprayed on part from the water column of spout hole ejaculation, guarantees fully cooling, makes part need the position of quenching strengthening that martensitic transformation occurs, and be 5 seconds cooling time; Cooling is taken off part surface hardness after finishing from strongback: 500-600HV ₁Effective case depth: DS=440HV ₁0.5-2, namely finish the quenching process of this part.

The two ends of quenching inducer active wires are welded together with an end of two transition wires respectively, the other end of two transition wires is welded together with an end of two converging wires respectively again, and two water inlet pipes are welded on the contact plate of two symmetries after being welded in respectively the other end of converging wires.

Positively effect of the present invention is to have solved the effective hardened layer distributing homogeneity of induction quenching, can reduce faradic heat penetration and enter the degree of depth; Adopt short period of time rapid heating mode, the shortening heat conduction time; That utilizes low-permeability material keeps away the magnetic effect, with the notch both sides that copper sheet makes induced current only flow through and obtain hardening in hope as the strongback of part, the heat affected zone of reducing part; By the adjustment of inductor block when assembling, guarantee that the gap of active wires and two sides of notch is evenly greatly about about 1mm; Inductor block simple in structure, the process time is short, and production efficiency is high.

Description of drawings:

Fig. 1 is the structural representation of inductor block of the present invention;

Fig. 2 is side structure schematic diagram of the present invention;

Fig. 3 is A-A schematic diagram of the present invention;

Embodiment:

The present invention will be further described below in conjunction with accompanying drawing: method for quenching end socket ribbet position of assembled camshaft as shown in the figure, and it is characterized in that: its concrete technology step is as follows: (A) contact plate 1 of the quenching inducer induction hardening transformer with quenching machine is tightened together; Guaranteeing under the unobstructed condition in water coolant and quenching water route, the part notch is placed on downwards on the strongback 5, this strongback 5 be the width that the thick copper sheet of the 6mm with the magnetic action of keeping away processes be 7.9mm, highly for the boss of 1mm as positioning table, the notch of part is sitting on the boss, the upper-lower position of limit feature, be the position of limit feature along active wires 2, to make two for the thick polyfluortetraethylene plate of 1mm of strongback 5 and active wires 2 insulation and heat-resisting function, the centre reserves the position and places part; The gap of active wires 2 and two sides of notch is evenly at 1mm; (B) at this moment, press start button, exchange current is by two pole plates and inductor block formation circulation of induction hardening transformer, under the effect in the magnetic field that this exchange current produces, make and produce induced current (eddy current) near the metal parts that is placed on the active wires 2 and make the part heating, be 2-3 second heat-up time, selects the higher induction heating power of frequency, and namely frequency is that 200kHz, power are 100kW mosfet transistor power supply; (C) when part is heated to above 50 ℃ of the austenitizing temperatures of material, stopped heating, and spray water immediately by the water-jet 9 that is welded in active wires 2 both sides; The rectangle water-jet 9 of two positioned opposite is welded on the

transition wire

17,18 of active wires 2 both sides, make the notch that is sprayed on part from the water column of spout hole ejaculation, guarantee fully cooling, make part need the position of quenching strengthening that martensitic transformation occurs, be 5 seconds cooling time; Cooling is taken off part surface hardness after finishing from strongback 5: 500-600HV ₁Effective case depth: DS=440HV ₁0.5-2, namely finish the quenching process of this part.

As Figure 1-3, the active wires 2 of quenching inducer and two transition wires 17, an end of 18 are welded together,

transition wire

17,18 is welded together with two converging wires 15, an end of 16 respectively again, be welded on the contact plate 1 of two symmetries after two water inlet pipes 14 are welded in respectively converging

wires

15,16 the other end, form the current circuit of inductor block; After two insulcretes 3 of strongback 5 usefulness of inductor block and two insulation thimble 19 and active wires 2 insulation, tighten together by two round brass washers 10, two insulating washers 11, two nuts 12 and two brass double-screw bolts 6 being welded in below the active wires 2; Two water-jets 9 with water inlet pipe 8 are welded on the

transition wire

17,18 of active wires 2 both sides by web plate 20, and the spout hole of two water-jets 9 is relative, make water column directly spray to the notch both sides of part; After 7 insulation of two contact plates, 1 usefulness insulating pad, tighten together with two brass bolts 13, four round brass washers 10, four insulating washers 11, two insulation thimble 7, two brass nuts 12.The material of induction quenching part: 44SMn28, quench part require to carry out induction quenching in the notch both sides of wide 8mm, height 8.5mm,

Table 1 termination notch quenching process parameters

Galvanic current

Volts DS

The power assignment

Real power

The turn ratio

Electric capacity

Frequency

Heat-up time

Cooling time

140-160A

180V

30kW

24-28kW

4∶2

4.2μF

195kHz

2.5S

5S

Claims

1. method for quenching end socket ribbet position of assembled camshaft, it is characterized in that: its concrete technology step is as follows: (A) contact plate (1) of the quenching inducer induction hardening transformer with quenching machine is tightened together; Guaranteeing under the unobstructed condition in water coolant and quenching water route, the part notch is placed on downwards on the strongback (5), this strongback (5) be the width that the thick copper sheet of the 6mm with the magnetic action of keeping away processes be 7.9mm, highly for the boss of lmm as positioning table, the notch of part is sitting on the boss, the upper-lower position of limit feature, be the position of limit feature along active wires, to make two for the thick polyfluortetraethylene plate of 1mm of strongback (5) and active wires (2) insulation and heat-resisting function, the centre reserves the position and places part; The gap of active wires (2) and two sides of notch is evenly at lmm; (B) at this moment, press start button, exchange current is by two pole plates and inductor block formation circulation of induction hardening transformer, under the effect in the magnetic field that this exchange current produces, make to produce induced current near the metal parts that is placed on the active wires (2) and make the part heating, be 2-3 second heat-up time, selects the higher induction heating power of frequency, be that frequency is that 200kHz, power are 100kW mosfet transistor power supply, reduce the thermoelectric current penetration depth; (C) when part is heated to above 50 ℃ of the austenitizing temperatures of material, stopped heating, and spray water immediately by the water-jet (9) that is welded in active wires (2) both sides; The rectangle water-jet (9) of two positioned opposite is welded on the transition wire (17,18) of active wires (2) both sides, make the notch that is sprayed on part from the water column of spout hole ejaculation, guarantee fully cooling, make part need the position of quenching strengthening that martensitic transformation occurs, be 5 seconds cooling time; Cooling is taken off surface hardness with part from strongback (5) after finishing: 500-600HV1; Effective case depth: DS=440HV1 0.5-2, namely finish the quenching process of this part.

2. method for quenching end socket ribbet position of assembled camshaft according to claim 1, the two ends of active wires (2) that it is characterized in that described quenching inducer are welded together with an end of two transition wires respectively, the other end of two transition wires (17,18) is welded together with an end of two converging wires (15,16) respectively again, two water inlet pipes (14) are welded on the contact plate (1) of two symmetries after being welded in respectively the other end of converging wires (15,16), form a current circuit.