CN2506049Y - Inductor used for surface induction heating - Google Patents

Abstract

The utility model discloses an inductor used for inducing heating on a surface, provided with two flow detectors, an upper induction coil and a lower induction coil, wherein, a magnetizer is arranged outside the lower induction coil, the upper induction coil and the lower induction coil are two semicircles, one of the flow detectors is communicated with a left semicircle of the lower induction coil, a left semicircle or the upper induction coil, a right semicircle of the lower induction coil, a right semicircle or the upper induction coil and the other flow detector in sequence and communicated with water. The utility model has the advantages that: 1. The inductor used for inducing heating on the surface of a workpiece is easy to make and is applicable to quenching the surfaces of all similar fittings through induction only based on corresponding modification of the physical dimension of the inductor; 2. the novel inductor does not have any obvious sharp angle effect, an ideal hardening layer can be obtained at step intermediate zones that have different axle diameters and a root segment of a flange; 3. having lower requirement for the precision of a quenching machine and spare clamps.

Description

The inductor that is used for the surface induction heating

Technical field

The utility model relates to a kind of inductor that is used for the surface induction heating.

Background technology

Hub is the high technology content of developing in recent years, the auto-parts of high added value, it is vapour axle company's new growth engines and developing direction, particularly company just discusses the supporting matters of third generation hub with global maximum auto parts machinery supplier DELPHI at present, therefore the hub trial-manufacture of sample is the task of top priority, and the surface heat processing is a hub manufacturing critical process; Particularly the surface heat treatment process difficulty of DELPHI part 7467101/03 is big, requirement is high, becomes the DELPHI project and develops bright critical bottleneck technology.

One, DELPHI project part 7467101/03 critical process surface is heat treated will ask for an interview to Fig. 1, is described as follows:

The A place: flange root quench-hardened case diameter reaches the requirement of Φ 64～74;

Locate for B45 °: require quench-hardened case DS=2.25～4.0, hardened layer hardness is HRC58～64;

The C ditch is directly located: require depth of hardening zone DS=2.75～6.0, hardened layer hardness is HRC60～64;

D diameter place: depth of hardening zone DS=1.0～2.0, hardened layer hardness is greater than HRC45;

E place: the minimum 8mm of being of the distance of not hardening.

Two, critical technological point analysis

1, the part head is very thin, easily heat penetration; Two step wedge angles and head seamed edge are overheated easily;

2, the flange root filtering area (raceway groove) different with diameter is to be difficult for heating region, and requires to obtain darker quench-hardened case;

3, B, C, D place depth of hardening zone require to differ;

4, whole surface requirements once heats and quenches simultaneously and obtain continuous hardened layer;

By above critical technological point analysis as can be known: adopting traditional quenching technology for surfaces and heating principle commonly used is to be difficult to meet the requirements of,

Three, inductor

1, by traditional handicraft---longitudinal magnetic flux heating commonly used, manufactured and designed a cone-type spiral inductor, be characterized in that induced current is along workpiece circumferencial direction distribution (seeing Fig. 3, the sense of current 1, inductor 2, workpiece 3 among the figure)

Result of the test is that sharp angle effect is strong, and step seamed edge and head are grilled thoroughly, and workpiece flange root and raceway groove (step axle transition region) are not heated to technological temperature.This scheme of evidence is not all right.

2, the method that adopts longitudinal magnetic flux and transverse magnetic flux to combine manufactures and designs inductor, be characterized in the induced current part along workpiece circumferencial direction part along workpiece axial direction (see figure 4).

This method has solved the heating problems of workpiece flange root through test, the raceway groove heating of workpiece also can but the degree of depth is not enough, do not reach the drawing requirement, this scheme of evidence is also not all right.

Summary of the invention

The utility model provides a kind of inductor that is used for the surface induction heating.It has two baffles, last induction coil, following induction coil, be provided with magnetic conductor outside the induction coil down, upper and lower induction coil is respectively two semicircles, one baffle is successively with following induction coil left semicircle, last induction coil left semicircle, induction coil right semi-circle, last induction coil right semi-circle and another baffle are interconnected down, and water flowing.

Advantage of the present utility model:

1, the inductor of surface of the work induction heating is made easily, and the inductor of this form is only made the surface induction hardening that corresponding change can adapt to all like parts to physical dimension.

2, novel inductor does not have tangible sharp angle effect, and the step transition district and the ring flange root of the different diameters of axle all can obtain desirable quench-hardened case.

3, not high to quenching machine and part clamp required precision.

Description of drawings

Fig. 1 is 7467101/03 sketch and the requirement of surface heat treatment technology;

Fig. 2 is the graph of a relation of quench-hardened case and heating time;

Fig. 3 is a longitudinal magnetic flux heating schematic diagram;

Fig. 4 is a vertical, horizontal magnetic flux heating schematic diagram;

Fig. 5 is a transverse magnetic flux heating schematic diagram;

Fig. 6 is the magnetizer structure dimensional drawing;

Fig. 7 is the sensor structure cutaway view;

Fig. 8 is the vertical view of inductor.

Embodiment

The inductor that is used for the surface induction heating has two baffles 4, last induction coil 5, following induction coil 6, be provided with magnetic conductor 7 outside the induction coil down, upper and lower induction coil is respectively two semicircles, one baffle is successively with following induction coil left semicircle, last induction coil left semicircle, induction coil right semi-circle, last induction coil right semi-circle and another baffle are interconnected down, and water flowing.

Said upper and lower induction coil is square special-shaped copper pipe.Following induction coil diameter is greater than last induction coil diameter.Magnetic conductor is the silicon steel sheet of δ=0.1～0.35 millimeter.

Four, the selection of process exploitation process 1, device frequency is according to data, and frequency is selected to be calculated as follows when induction heating rotary body, plane body: $f=\frac{5\×{10}^4}{{\mathrm{\δ}}^2}$ Get δ=2.5mm, then $f=\frac{5\×{10}^4}{{\mathrm{\δ}}^2}=8000\mathrm{HZ}$ The calculation specifications surface hardening adopts intermediate frequency power supply more suitable.2, power calculation is according to the computational methods of data introduction, and part heats total power consumption:

Q=Δ Q.S wherein, Δ Q=5kw.s/cm ²The surface area of the surface area part heating of (the specific energy consumption consumption has been considered various losses) S---part heating is divided into four parts, is calculated as follows: S=S ₁+ S ₂+ S ₃+ S ₄ $S_1=\mathrm{\π}.{\left(\frac{7.4}{2}\right)}^2=\mathrm{\π}{\left(\frac{5.0}{2}\right)}^2=24.22{\mathrm{cm}}^2$ Introduce the graph of a relation (see figure 2) of quench-hardened case and heating time by data, find: DS=2.5mmS ₂=12 * π * 38=14cm ²S ₃=24 * π * 43=32.4cm ²S ₄=12 * π * 50=18.8cm ²S=24.22+14+32.4+18.8=89.4cm ²Q=5kw.s/cm ²* 89.4cm ²=447kw.s

Be 3 seconds (DELPHI requires not too wide transition region of quench-hardened case core metal, and will lack selected heating time) corresponding heating time, and then rated output is: ${\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="Y0122833300071.png"\; state="\{\{state\}\}">P</figure-callout>}}_0=\frac{Q}{t}=\frac{447\mathrm{kw}.s}{3s}=149\mathrm{kw}$

Select to be greater than 150kw according to the result of calculation plant capacity, promptly equipment choosing power 150kw or 200kw all can.

3, sensor structure design

All adopt the transverse magnetic flux heating to manufacture and design the inductor (see figure 5).Be characterized in inductive current direction along the workpiece axial direction, workpiece step seamed edge and head corner angle sharp angle effect are very little, and step axle filtering area (raceway groove) and surface of the work CURRENT DISTRIBUTION are even; In order to make workpiece flange root obtain same firing rate, increased by row's magnetic conductor near circle under the inductor of workpiece flange root, material is selected the silicon steel sheet (reality substitutes with δ=0.5mm) of δ=0.1～0.35mm for use according to data.Magnetic conductor adopts the line cutting processing, and physical dimension is seen Fig. 6.

Inductor and workpiece radial clearance are 3mm, with the Flange Plane gap be 2mm, concrete structure size See Attachment 1 sensor structure figure.

4, engineer testing

Adopt novel inductor, heat run just finds that each position of workpiece comprises ring flange root, raceway groove (step axle transition region), excircle of workpiece surface homogeneous heating for the first time.Find the head through hardening by cutting sample, analyze discussion through us and solved this problem at head endoporus take the to spray water technological measure of cooling.

Five, quality testing

Check result reaches the drawing requirement fully and meets DELPHI standard HTS004.(, and there is not the impewdance matching metal lographic examination standard of 1070 steel correspondences at present because DELPHI standard HTS004 metallographic structure does not have classification; And the chemical composition of 1070 steel is similar to 65Mn, so use People's Republic of China's professional standard, standard No.: ZB J36009-98, standard name: steel part impewdance matching metal lographic examination, applicability of standard: the machine components that medium carbon structural steel and medium carbon structural alloy steel are made, the check of metallographic structure and effective case depth behind height, mid-frequency induction hardening.)

Six, conclusion

1, the inductor that manufactures and designs of transverse magnetic flux heating is through facts have proved: the sharp angle effect in the time of can reducing surface hardening, and the step axle filtering area of the different diameters of axle can obtain desirable quench-hardened case;

2, DELPHI workpiece 7467101/03 quenching technology for surfaces can promote the use of all similar workpiece of third generation hub.

Claims (4)

1. one kind is used for the inductor that surface induction heats, it is characterized in that it has two baffles [4], last induction coil [5], following induction coil [6], be provided with magnetic conductor [7] outside the induction coil down, upper and lower induction coil is respectively two semicircles, one baffle is successively with following induction coil left semicircle, last induction coil left semicircle, induction coil right semi-circle, last induction coil right semi-circle and another baffle are interconnected down, and water flowing.

2. a kind of inductor that is used for the surface induction heating according to claim 1 is characterized in that said upper and lower induction coil is square special-shaped copper pipe.

3. a kind of inductor that is used for the surface induction heating according to claim 1 and 2 is characterized in that said induction coil diameter down is greater than last induction coil diameter.

4. a kind of inductor that is used for surface induction heating according to claim 1 is characterized in that said magnetic conductor is the silicon steel sheet of δ=0.1～0.35 millimeter.

Images