CN102234710B - Ohmic heating method and ohmic heating device - Google Patents
Ohmic heating method and ohmic heating device Download PDFInfo
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- CN102234710B CN102234710B CN201010156622.5A CN201010156622A CN102234710B CN 102234710 B CN102234710 B CN 102234710B CN 201010156622 A CN201010156622 A CN 201010156622A CN 102234710 B CN102234710 B CN 102234710B
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Abstract
The invention relates to an ohmic heating method and an ohmic heating device. Through the ohmic heating method and the ohmic heating device, the quenching or annealing of the back surface and tooth surface of a workpiece can be carried out in a roughly continuous operation period, and the high-precise quenching or annealing quality is easily obtained on the back surface or tooth surface while striving to improve the efficiencies of quenching or annealing. The ohmic heating method is characterized by comprising the following steps that a switching device is switched to a back surface side, so that one pair of first touch points contact the two ends of the heating range in the length direction of the back surface of the workpiece supported by a support device, the regulated frequency and output current for the back surface are supplied to the touch points from a power supply device, and then ohmic heating is carried out on the back surface; and after the step, the switching device is switched to a tooth surface side, so that one pair of second touch points contact the two ends of the heating range in the length direction of the tooth surface of the workpiece, the regulated frequency and output current for the tooth surface are supplied to the touch points from the power supply device, and then the ohmic heating is carried out on the tooth surface.
Description
Technical field
The present invention relates to a kind ofly heat turning to the back side of the workpiece such as tooth bar and the flank of tooth quenches or the energising heating means and the electric heating device that use when tempering by energising.
Background technology
Originally,, as this class electric heating device, for example, in Patent Document 1 (as No. 4232973 communique of Japanese Patent), disclosed.This electric heating device is equipped with a pair of powered electrode (contact) configuring in opposite directions in heated perimeter along the length direction of tooth bar, supply unit from the electric current of assigned frequency to this powered electrode that supply, and start from the inclined to one side mid-way of direction in opposite directions of powered electrode to this direction portion of terminal that roughly the crossing horizontal direction of straight line is extended in opposite directions, electric current by this portion of terminal from described supply unit item powered electrode supply regulation, and the flank of tooth of energising heating tooth bar etc. quenches.
But, this electric heating device is the flank of tooth or the back side that makes pair of contact contact tooth bar, then respectively to the flank of tooth or back side supply regulation outward current, thereby reach the flank of tooth of energising heating tooth bar or the object of quenching in the back side, but after quenching can not continue the flank of tooth to quench in the back side of tooth bar.So, can not roughly carry out quenching or the tempering of the tooth bar back side and the flank of tooth in continuous working cycle at one, exist operating efficiency low, and the quenching of the tooth bar back side or the flank of tooth or annealing quality are difficult to the problem points guaranteeing.
Summary of the invention
In view of such situation, the object of the present invention is to provide a kind of energising heating means and electric heating device, roughly carry out quenching or the annealing of back of work and the flank of tooth in continuous working cycle at one, make every effort to improve the efficiency of quenching or annealing operation, can easily obtain high-precision quenching or annealing quality with the flank of tooth overleaf simultaneously.
For achieving the above object, the present invention is achieved in that
A kind of energising heating means, it is characterized in that having following step, shifter is switched to rear side, make the length direction heated perimeter two ends at the back side of the 1st paired contact contact bracing or strutting arrangement supporting workpiece, the step at the frequency of the regulation of using to this supply back side, contact from supply unit and the outward current energising heating back side; And after this step, described shifter is switched to flank of tooth side, make the 2nd paired contact contact the length direction heated perimeter two ends of the described workpiece flank of tooth, the step of the flank of tooth is heated in the frequency of the regulation of using to this contact supply flank of tooth from described supply unit and outward current energising.
Described method, is characterized in that, possess after the energising heating at the described back side and the energising of described flank of tooth heating after, by the step that is configured in refrigerating unit between described each contact to the described back side and the flank of tooth sprays water coolant.And, possess after described switch means is switched, will adjust to MIN step to power frequency and the electric power of described each contact supply as far as possible.
A kind of electric heating device, it is characterized in that, on electric heating device, have can contact the back of work that supports by bracing or strutting arrangement and flank of tooth length direction heated perimeter two ends the 1st paired contact and the 2nd contact, be provided in paired refrigerating unit between each contact, by shifter to described the 1st contact and the supply unit of the 2nd contact supply rated current, control the control device of this supply unit, described refrigerating unit and described shifter; Described control device is being selected described shifter one property and is being switched to the back side or the flank of tooth, simultaneously according to the switching state of this shifter from described supply unit to described the 1st contact or the 2nd supply back side, contact with or frequency and the outward current of the regulation used of the flank of tooth.
Described electric heating device, is characterized in that, described supply unit has multiple frequency changer circuits or has frequency and output can be adjusted to a MIN frequency circuit as far as possible.
The technique effect of invention is:
1, energising heating means of the present invention, owing to possessing the step that shifter is switched to the rear side energising heated parts back side, and shifter is switched to the step of the flank of tooth side energising heated parts flank of tooth after this step, therefore can roughly carry out quenching or the annealing of back of work and the flank of tooth in continuous working cycle at one, can, in making every effort to improve quenching or annealing operating efficiency, easily obtain good quenching or annealing quality with the flank of tooth overleaf.
2, energising heating means of the present invention, due to after possessing energising heating overleaf and after flank of tooth energising heating, from the step that is configured in refrigerating unit between each contact to the back side and the flank of tooth sprays water coolant, so, can carry out efficiently with water coolant the quenching of back of work and the flank of tooth, also can easily obtain high-precision quenching quality with the flank of tooth overleaf simultaneously.
3, energising heating means of the present invention, also possess after shifter switches, the power frequency and the output that are supplied to each contact are adjusted to MIN step as far as possible, therefore can the automatically switch back side of workpiece and the quenching conditions of the flank of tooth, can carry out quenching or the annealing of the back side and the flank of tooth more efficiently.
4, electric heating device of the present invention, in selecting a property by control device shifter be switched to the back side and the flank of tooth, according to the switching state of this shifter from supply unit according to the back side with and the assigned frequency used of the flank of tooth to the 1st contact or the 2nd contact supply outward current, so, described in requiring 1 with patent, invention is the same, can roughly carry out quenching or the annealing of back of work and the flank of tooth in continuous working cycle at one, can be in making every effort to improve the efficiency of quenching or annealing operation, easily obtain high-precision quenching or annealing quality with the flank of tooth overleaf.
5, electric heating device of the present invention, supply unit has multiple frequency changer circuits or has frequency and output can be adjusted to a MIN frequency circuit as far as possible, so, can be from each frequency changer circuit conscientiously and stably to the back side or the suitable electric current of flank of tooth supply of workpiece, and can further promote operating efficiency and quenching quality etc.
Accompanying drawing explanation
Fig. 1 is the summary pie graph of the electric heating device that the present invention is relevant;
Fig. 2 is contact of the present invention contact condition schematic section;
Fig. 3 is front elevation and the B-B direction of arrow schematic diagram of other contact conditions of contact of the present invention;
Fig. 4 is cooling casing explanatory view of the present invention;
Fig. 5 is the explanatory view of switch of the present invention and frequency changer circuit;
Fig. 6 is the explanatory view of switch of the present invention and other examples of frequency changer circuit;
Fig. 7 is quenching method example signal schedule drawing of the present invention;
In figure:
1 ... electric heating device, 2a, 2b ... chuck, 3 ... chuck drive portion, 4a, 4b ... the 1st contact, 4c, 4d ... the 2nd contact, 5a, 5b ... contact driving part, 6 ... switch, 7a, 7b ... cooling casing, 8a, 8b ... casing driving part, 9 ... frequency changer circuit, 9a ... the 1st frequency changer circuit, 9b ... the 2nd frequency changer circuit, 10 ... control part, 11 ... chilled(cooling) water supply (CWS) portion, 12 ... recess, 13 ... casing body, 13a ... water coolant stream, 13b ... jet hole, 14 ... output adjustment part, W ... workpiece (tooth bar), Wa ... the back side, Wb ... the flank of tooth, Wc ... teeth groove (paddy).
Embodiment
Describe according to drawing the optimal morphology adopting for carrying out the present invention in detail below.
Example when Fig. 1～Fig. 7 represents the electric heating device the present invention relates to for rack quenching.As shown in Figure 1, the applicable tooth bar (being called workpiece W below) of electric heating device 1 of the present invention becomes the flank of tooth Wb of predetermined angular by what have a helical teeth with respect to axis, and forms at the back side Wa being made up of semicircle cambered surface of this flank of tooth Wb opposition side.
Then, electric heating device 1 is equipped with lower array apparatus: by the left and right chuck 2a, the 2b that support described workpiece W two ends as supporting method, with the chuck drive portion 3 that makes this chuck 2a, 2b move and clamp according to the direction of arrow イ or unclamp the composition such as click of workpiece W, and by 1 couple the 2nd contact 4c, the 4d that are disposed at copper coin on the length direction heated perimeter two ends of workpiece W back side Wa etc. and form.
In addition, on described the 1st contact 4a, 4b, connecting contact driving part 5a, contact 4a, 4b according to the arrow ロ advance and retreat of Fig. 1, can connect the output terminal of switch 6 one sides as shifter simultaneously simultaneously.In addition, on described the 2nd contact 4c, 4d, connecting contact driving part 5b, contact 4c, 4d, simultaneously according to arrow Ha advance and retreat, can connect the output terminal of the opposite side of the above switch 6 simultaneously.Between described the 1st contact 4a, 4b and between the 2nd contact 4c, 4d, configure cooling casing 7a and the cooling casing 7b as refrigerating unit, on this cooling casing 7a, connect the casing driving part 8a being formed by open and close valve etc., on cooling casing 7b, connecting the casing driving part 8b being formed by same valve etc.
And, connecting as the frequency changer circuit 9 of supply unit and having minicomputer or the control part of sequencer 10 at the input terminus of described switch 6.At this moment, switch 6 as shown in Figure 5, formed by common contact 6a and normally closed contact 6b, normal opened contact 6c and electromagnetism shutter or the special switch of being furnished with driving part 6d, common contact 6a is connected in frequency changer circuit 9, normally closed contact 6b is connected in the 1st contact 4a, 4b, meanwhile, normal opened contact 6c is connected in the 2nd contact 4c, 4d.In addition, as shown in Figure 1, described control part 10 is except connecting switch 6, also connecting respectively frequency changer circuit 9, chuck drive portion 3, contact driving part 5a, 5b, casing driving part 8a, 8b, in addition, on described each casing driving part 8a, 8b, connecting the chilled(cooling) water supply (CWS) such as cooling water tank or running water pipe portion 11.
Described the 1st contact 4a, 4b and the 2nd contact 4c, 4d as shown in Figure 2, have the recess 12 of semicircular arc on its contact surface, a part of close contact of the circular arc periphery of this recess 12 and workpiece W.At this moment, the 1st contact 4a, 4b contact (for example, from top contact) with the back side Wa of workpiece W, the 2nd contact 4c, 4b contact (for example, from below contact) with the non-flank of tooth (part beyond teeth groove described later) at the length direction heated perimeter two ends of the flank of tooth Wb of workpiece W.
And described the 2nd contact 4c, 4b are not limited to form shown in Fig. 2, its contact surface also can touch in the teeth groove starting most (paddy) Wc at length direction heated perimeter two ends of flank of tooth Wb, and example as shown in Figure 3.In addition, about the 1st contact 4a, 4b and the 2nd contact 4c, 4d, among pair of contact, contact 4b, the 4d of one side is configured to move according to the arrow ニ of Fig. 3 (a), also can according to can corresponding flank of tooth Wb or the form of the length L of back side Wa form, this formation can be applicable to the contact 4a～4d of form shown in Fig. 2.So, the form of contact 4a～4d just can, according to shapes such as the degree of depth of the size of the back side Wa of workpiece W or flank of tooth Wb or teeth groove Wc, be used the object with the osculatory of suitable shape or the contact surface of Rack.
Described cooling casing 7a, 7b as shown in Figure 4, are furnished with the casing body 13 that forms water coolant stream 13a in inside, with the flank of tooth Wb of the workpiece W of this casing body 13 or back side Wa in opposite directions above or below formed multiple jet hole 13b.At this moment, the jet hole 13b on the cooling casing 7b of flank of tooth Wb side forms oblique along the helical teeth of flank of tooth Wb.Then, by the operation of described casing driving part 8a, 8b, cooling-water flowing Figure 13 a cooling water supply from from described chilled(cooling) water supply (CWS) portion 11 to casing body 13, sprays to the flank of tooth Wb (or back side Wa) of workpiece W according to direction shown in arrow ホ from jet hole 13b.
Described frequency changer circuit 9 is made up of the frequency changer circuit of thyristor, and it is the alternating current of frequency (for example 60～100Hz) from its output terminal to described switch 6 output regulation outputs according to the rules.As shown in Figure 5, there is output adjusting portion 14 inside of this frequency changer circuit 9, it can regulate to frequency or output and the time of the electric current of described contact 4a～4b supply, by the control signal adjustment output adjustment part 14 of sending from described control part 10, for example, export the back side and quench with electric current and 2 kinds of electric currents of flank of tooth quenching electric current.
In addition, structure as the frequency changer circuit 9 of supply unit is not limited to Fig. 5, example as shown in Figure 6, frequency changer circuit 9 has the 1st frequency changer circuit 9a of back side quenching use and the 2nd frequency changer circuit 9b of flank of tooth quenching use, also the output terminal of frequency changer circuit 9a, 9b can be connected on the common terminal 6a of switch 6.At this moment, the 1st frequency changer circuit 9a and the 2nd frequency changer circuit 9b form the control signal by control part 10 operating state of selecting a property, but the structure of switch 6 is not just the switching that an input two is exported, but the switching of two input two outputs, therefore two frequency changer circuit 9a, 9b can be simultaneously in operating states.If adopt this structure, that will be from frequency changer circuit 9a, 9b to the 1st contact 4a, 4b and (special) circuit of the 2nd contact 4c, 4d supply regulation.In addition, at this moment, also can on the 1st frequency changer circuit 9a and the 2nd frequency changer circuit 9b, described output adjustment part 14 be set, determine that back side quenching is used or the electric current of flank of tooth quenching use, thereby carry out trickle control.
Use a quench example of operation of described electric heating device 1 according to the schedule drawing explanation workpiece W of Fig. 7 below.And, in the following description, be the structure shown in Fig. 5 as the frequency changer circuit 9 of supply unit.First, block (K01) described workpiece W by left and right chuck 2a, 2b, turn round described contact driving part 5a, 5b running, and make the 1st contact 4a, 4b and the 2nd contact 4c, 4d to the back side Wa of workpiece W and flank of tooth Wb advance (K02), when the 1st contact 4a, 4b touch the length direction heated perimeter two ends of back side Wa of workpiece W, the 2nd contact 4c, 4d also touch the length direction heated perimeter two ends of the flank of tooth Wb of workpiece W.
Under this state, the driving part 6d of the control signal running switch 6 by control part 10, switches (K03) to rear side by this switch 6.Then, under this state, adjust described output adjustment part 14 by the control signal of control part 10, and the time is fed to the 1st contact 4a, 4b by back side quenching with electric current according to the rules, energising heating (K04) back side Wa, in the time that this energising heating finishes, roughly simultaneously by the control signal time operation casing driving part 8a according to the rules of control part 10, and spray water coolant from cooling casing 7a, the back side Wa after cooling (K05) heating.Heating by this specified time and cooling, quenches to the back side Wa of workpiece W.
Then, after the back side Wa of workpiece W quenches, control signal by control part 10 is switched (K06) to flank of tooth Wb side by switch 6, under this state, adjust the output adjustment part 14 of frequency changer circuit 9 by the control signal of control part 10, and the time is fed to the 2nd contact 4c by flank of tooth quenching with electric current according to the rules, 4d, energising heating (K07) flank of tooth Wb, in the time that this energising heating finishes, roughly simultaneously by the control signal time operation casing driving part 8b according to the rules of control part 10, and spray water coolant from cooling casing 7b, flank of tooth Wb after cooling (K08) heating.
Heating by this specified time and cooling, quenches to the flank of tooth Wb of workpiece W.After the quenching of this flank of tooth Wb finishes, move described contact driving part 5a, 5b, make contact 4a～4d retreat (K09), remove the contact condition of contact 4a～4d and workpiece W., by the control signal operation chuck drive portion 3 of control part 10, chuck 2a, 2b retreated, unclamp (K10) workpiece W, and take out workpiece W from left and right chuck 2a, 2b, so far finish a series of quenching operation thereafter.That is, the back side Wa of workpiece W and the quenching of flank of tooth Wb can be passed through the control signal of control part 10, are setting under the state of workpiece W, roughly in continuous circulation, carry out at one.
For example, and described quenching method is an example,, advancing of contact 4a～4d in the time of operation K02 can be that the 1st contact 4a, 4b advance separately, the 2nd contact 4c, 4d advance etc. after operation K06, that is, the 1st contact 4a, 4b and the 2nd contact 4c, 4d can move respectively.In addition, the situation when back side Wa of workpiece W or flank of tooth Wb quench is described in Fig. 7, when these are carried out to tempering operation, as long as omit the refrigerating work procedure of operation K05, K08.And, under identical switch-on regime, when the back side Wa of heated parts W and flank of tooth Wa, can not adjust the output adjustment part 14 of frequency changer circuit 9, as long as to the electric current of the certain output of contact 4a～4d supply.
Like this, use the words of described electric heating device, by control part 10, switch 6 is selected to a property and be switched to rear side and flank of tooth side, simultaneously according to the switching state of this switch 6 frequency according to the rules from frequency changer circuit 9 to the 1st contact 4a, 4b and the 2nd contact 4c, time is supplied outward current in 4d one according to the rules, therefore can roughly carry out quenching or the annealing of back side Wa and the flank of tooth Wb of workpiece W in continuous working cycle at one, can be in making every effort to improve the efficiency of quenching or annealing operation, can easily on the back side of workpiece W Wa and flank of tooth Wb, obtain high-precision quenching or annealing quality.
In addition, if form the frequency changer circuit 9 as supply unit by the frequency changer circuit of an adjustable frequency and output, that just can export respectively by control part 10 electric current that the electric current used at the back side and the flank of tooth are used through output adjustment part 14, formation that like this will frequency changer circuit 9 just can form low-cost electric heating device 1 after simplifying.In addition, if form frequency changer circuit 9 by the back side is used and the flank of tooth is used 2 special frequency changer circuit 9a, 9b, that just can, conscientiously stably to the back side Wa of workpiece W or the electric current of flank of tooth Wb supply regulation, can simplify the control of being undertaken by control part 10 simultaneously.
And, if the recess of semicircular arc 12 is arranged on the 1st contact 4a, 4b and the 2nd contact 4c, 4d, contact 4a～4d just can fit tightly the non-flank of tooth part at the back side of workpiece W Wa or flank of tooth Wb so, make switch-on regime stable, suppress the generation of when energising spark etc., and can be easily on the flank of tooth Wb of workpiece W or back side Wa, obtain more high-precision quenching or annealing quality.In addition, if structure is that the 2nd contact 4c, 4d touch in the teeth groove Wc of workpiece W flank of tooth Wb, location between the 2nd contact 4c, 4d and the flank of tooth Wb of workpiece W just can be carried out conscientiously so, define the action of the 2nd contact 4c, 4d while energising etc. simultaneously, switch-on regime be can stablize like this, and can easily on the flank of tooth Wb of workpiece W, high-precision quenching or tempering quality be obtained.
In addition, energising heating means of the present invention are provided with switch 6 are switched to then the switch on operation of back side Wa of heated parts W of rear side, and switch 6 is switched to the operation of the flank of tooth Wb of flank of tooth side energising heated parts W after this operation, so can roughly carry out the back side Wa of workpiece W and the quenching of flank of tooth Wb or annealing operation in continuous working cycle at one, can, in making every effort to improve the efficiency of quenching or annealing operation, easily on the back side of workpiece W Wa and flank of tooth Wb, obtain good quenching or annealing quality.
In addition, due to after being provided in back side Wa energising heating and after flank of tooth Wb energising heating, spray the operation of water coolant to back side Wa and flank of tooth Wb from being disposed at cooling casing 7a between contact 4a, 4b and 4c, 4d and cooling casing 7b, so can effectively carry out by water coolant the quenching of back side Wa and the flank of tooth Wb of workpiece W, can easily obtain high-precision quenching quality on the back side of workpiece W Wa and flank of tooth Wb simultaneously.And, in the time switching switch 6, owing to being equipped with, the power frequency of exporting from frequency changer circuit 9 and output are adjusted to MIN operation K04, K07, so can automatically switch, the back side Wa of workpiece W and the quenching conditions of flank of tooth Wb etc., can carry out quenching or the annealing etc. of back side Wa and flank of tooth Wb more effectively.
And, in described example, the form of each contact 4a～4d or touch all examples just such as form, the power frequency of exporting from frequency changer circuit 9 of position, cooling casing 7a, the 7b of workpiece W, it can carry out suitable change according to the form of workpiece W, for example, make the back side Wa side of workpiece W and contact 4a, the 4b of flank of tooth Wb side and the form of 4c, 4d not equal.
The present invention is not defined in tooth bar by workpiece, and it can be used for the quenching annealing faces such as geared surface, and has and need to quench or the various workpiece at the back side of tempering at the face contrary with it.
In sum, be only preferred embodiment of the present invention, be not used for limiting practical range of the present invention, i.e. all equivalences of doing according to the content of the present patent application the scope of the claims change and modify, and all should be technology category of the present invention.
Claims (5)
1. energising heating means, it is characterized in that thering are two steps: operation has the driving part of common contact and normally closed contact, normal opened contact and shifter, this shifter is switched to rear side, make the circular arc periphery at the length direction heated perimeter two ends of the back of work of the recess contact bracing or strutting arrangement support forming on the contact surface of the 1st paired contact, the step at the frequency of the regulation of using to the 1st supply back side, contact from supply unit and the outward current energising heating back side; After this step, move the driving part of described shifter, this shifter is switched to flank of tooth side, make the recess forming on the contact surface of the 2nd paired contact contact the length direction heated perimeter two ends of the described workpiece flank of tooth, or the contact surface that makes the 2nd paired contact touches in first ditch at length direction heated perimeter two ends of described workpiece, the step of the frequency of the regulation of using to the 2nd contact supply flank of tooth from described supply unit and the outward current energising heating flank of tooth.
2. the heating means of switching on according to claim 1, is characterized in that, described method steps is specific as follows:
K01. block described workpiece by left and right chuck;
K02. contact driving part turns round, and advanced in the 1st contact and the 2nd contact to the back side and the flank of tooth of workpiece, when the 1st contact touches the length direction heated perimeter two ends at the back side of workpiece, the 2nd contact also touches the length direction heated perimeter two ends of the flank of tooth of workpiece;
K03. the driving part that passes through the control signal running switch of control part, is switched to rear side by this switch;
K04. under this state, by the control signal adjustment output adjustment part of control part, and the time is fed to the 1st contact by back side quenching with electric current, the energising heating back side according to the rules;
K05. in the time that this energising heating finishes, roughly simultaneously by the control signal time operation casing driving part according to the rules of control part, and from but water of cooling casing injected cool, the back side after cooling heating, heating by this specified time and cooling, quenches to the back side of workpiece;
K06., after quench in the back side of workpiece, by the control signal of control part, switch is switched to flank of tooth side;
K07. under this state, adjust the output adjustment part of frequency changer circuit by the control signal of control part, and the time is fed to the 2nd contact by flank of tooth quenching with electric current, the energising heating flank of tooth according to the rules;
K08. in the time that this energising heating finishes, roughly simultaneously by the control signal time operation casing driving part according to the rules of control part, and from but water of cooling casing injected cool, the flank of tooth after cooling heating; Heating by this specified time and cooling, quenches to the flank of tooth of workpiece;
K09., after the quenching of this flank of tooth finishes, operation contact driving part, retreats the 1st contact and the 2nd contact, removes the contact condition of contact and workpiece;
K10. by the control signal operation chuck drive portion of control part, chuck is retreated, unclamp workpiece, and take out workpiece from left and right chuck.
3. according to the heating means of switching on described in claim 1 or 2, it is characterized in that, after described shifter switches, by described the 1st contact, power frequency and the electric power of the 2nd contact supply adjusts to bottom line as far as possible.
4. an electric heating device, it has the 1st paired contact, the recess forming on its contact surface can contact the circular arc periphery at the back of work length direction heated perimeter two ends of supporting by bracing or strutting arrangement, and the 2nd paired contact, the recess forming on its contact surface contacts the length direction heated perimeter two ends of the described workpiece flank of tooth, or its contact surface touches in first ditch at length direction heated perimeter two ends of described workpiece, and be provided in the paired refrigerating unit between each contact, by thering is common contact and normally closed contact, the driving part of normal opened contact and shifter is to described the 1st contact and the supply unit of the 2nd contact supply rated current, control this supply unit, the control device of described refrigerating unit and described shifter, it is characterized in that, described control device moves the driving part of described shifter, this shifter is selected to a property and is switched to the back side or the flank of tooth, simultaneously according to the switching state of this shifter from described supply unit to described the 1st contact or the 2nd supply back side, contact with or frequency and the outward current of the regulation used of the flank of tooth.
5. electric heating device according to claim 4, is characterized in that, described supply unit has multiple frequency changer circuits or has frequency and output can be adjusted to a MIN frequency circuit as far as possible.
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| CN201010156622.5A CN102234710B (en) | 2010-04-26 | 2010-04-26 | Ohmic heating method and ohmic heating device |
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| CN201010156622.5A CN102234710B (en) | 2010-04-26 | 2010-04-26 | Ohmic heating method and ohmic heating device |
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| CN102234710A CN102234710A (en) | 2011-11-09 |
| CN102234710B true CN102234710B (en) | 2014-07-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102912094B (en) * | 2012-11-02 | 2014-02-12 | 十堰恒进科技有限公司 | Quench machine tool |
| CN104775016A (en) * | 2015-02-28 | 2015-07-15 | 宫电高周波设备（上海）有限公司 | Ohmic heating device for toothed bar |
| JP6628398B2 (en) * | 2015-09-15 | 2020-01-08 | 株式会社ミヤデン | Electric heating device for steering rack bar |
| CN105296719A (en) * | 2015-09-29 | 2016-02-03 | 宫电高周波设备（上海）有限公司 | Ohmic heating device for rack for steering |
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