CN108176772A - Drop stamping plate heating unit - Google Patents
Drop stamping plate heating unit Download PDFInfo
- Publication number
- CN108176772A CN108176772A CN201711451878.7A CN201711451878A CN108176772A CN 108176772 A CN108176772 A CN 108176772A CN 201711451878 A CN201711451878 A CN 201711451878A CN 108176772 A CN108176772 A CN 108176772A
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- Prior art keywords
- electrode
- several
- electrodes
- drop stamping
- stamping plate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
Abstract
The invention discloses a kind of drop stamping plate heating units,For heating to drop stamping plate,Including heater circuit,The heater circuit includes several first electrodes,Several second electrodes,Several adjustable resistances and DC power supply,Several first electrodes are set parallel along the first side length direction of the drop stamping plate,The second electrode is symmetrically set in the second side of the drop stamping plate,Often opposite first electrode and second electrode form one group of heating electrode,First side contacts of the first end of the first electrode with the drop stamping plate,First end of the second end of the first electrode directly with the DC power supply is connected,Second side contacts of the first end of several second electrodes with the drop stamping plate,The second end of several second electrodes is respectively by being connected to the second end of the DC power supply after adjustable resistance,A resistance value detector is optionally connected in series between any first electrode and the first end of the DC power supply.
Description
Technical field
The present invention relates to drop stamping plate heating art, more particularly to a kind of drop stamping plate heating unit.
Background technology
Drop stamping is a kind of manufacturing process for obtaining and possessing excellent performance stamping parts, and process is high strength steel plate
(22MnB) is heated to austenitizing temperature and keeping the temperature homogenizes austenite, then moves quickly into stamping die, in mold
Upper completion punching course and pressurize quenching, finally obtain high-strength steel pressing of the tissue morphology based on martensite.Drop stamping work
The advantages of skill, is in punching course that resistance of deformation is small, and gained product intensity is high, and it is small to spring back opposite cold-stamped part.
Influence of the variation of plate temperature to drip molding quality is notable in its forming process.Since the cooldown rate of plate exists
It is non-uniform in entire punching course, heat during high temperature between plate and mold is transmitted very fast.Just start in punching course
When, punch-nose angle and die entrance touch plate at first, cause between plate and mold due to there is the huge temperature difference at this time
Heat transfer is violent and falls to cause to decline acutely with this portion of material temperature, and this portion of material is caused to start to turn to ferrite and pearlite
Become, so that cannot get martensitic phase during final quenching.With continuing for punching course, contacted with die entrance that
Portion of material continues the sidewall sections that the flowing into mold forms stamping parts；At the same time, the material of flange section is gradually in
The heart is flowed and is contacted with die entrance, this is but also this portion of material temperature declines, and then starts to turn to ferrite and pearlite
Become and make finally to quench obtained martensite content reduction.The non-uniform cooling of the above it is final so that the fillet of drip molding and
Side wall occurs diffusion transformation and makes ferrite and pearlite content more, and the heat-punch member horse for quenching final pressurize
Family name's body content is few and nonuniform organization.
Can influence of the pressurize quenching process of drop stamping to drip molding tissue and performance be also particularly important, obtain martensite
Content is uniform, and the uniform component of performance depends on the cooldown rate of plate various pieces in pressurize quenching process.Only work as plate
Cooldown rate be more than critical cooling rate (for most drop stamping boron steels, this critical value is about 27 DEG C/s) when austenite
Martensite can be changed into.However in pressurize hardening phase, blank and mold contact are often non-uniform, this is because in Re Chong
The material at punch-nose angle and the material at punch-nose angle touch mold at first during pressure, this two-part material cooldown rate adds
It is fast thus generate differential hardening, and during post forming, the effect of drip molding sidewall sections material tension stress and be thinned
When causing finally to mold, the side wall of drip molding cannot be completely bonded with mold shape face and there are gaps.Blank and mold contact are tight
Close local heat by convection current, radiation, pass fall diffusion thus cooldown rate it is very fast, and blank and mold have gap place heat
Amount can only be propagated, therefore cooldown rate is slower in the form of heat radiation and by air dielectric.The inhomogeneities of cooldown rate is fallen
The uneven of tissue has been caused, so that stamping parts overall mechanical properties is uneven, it is slow in sidewall sections cooldown rate, it is obtained
The martensite content obtained is low, and intensity hardness is insufficient.Therefore, there is an urgent need to one kind to carry out phase to drop stamping plate different location
Answer the heating unit of the heating of temperature.
Invention content
In view of this, the present invention it is really necessary to provide it is a kind of can to the different location of drop stamping plate carry out relevant temperature
The drop stamping plate heating unit of heating.
A kind of drop stamping plate heating unit is provided, for heating to drop stamping plate, including a heater circuit,
The heater circuit includes several first electrodes, several second electrodes, several adjustable resistances and DC power supply, and described several the
One electrode is set parallel along the first side length direction of the drop stamping plate, and several second electrodes are symmetrically set in the heat
The second side of punching press plate, an often opposite first electrode and a second electrode one group of heating electrode of formation, described several first
First side contacts of the first end of electrode with the drop stamping plate, the second ends of several first electrodes is directly and institute
The first end for stating DC power supply is connected, the second side joint of the first ends of several second electrodes with the drop stamping plate
It touches, the second end of several second electrodes is appointed respectively by being connected to the second end of the DC power supply after an adjustable resistance
A resistance value detector is optionally connected in series between one first electrode and the first end of the DC power supply to detect pair
The resistance value of heating electrode loop that should be organized.
Further, the heater circuit further includes another first electrode and another second electrode, another first electrode
With another second electrode form another group of heating electrode, another second electrode directly with the second end phase of the DC power supply
Even.
Further, anode of the second end of several first electrodes directly with the DC power supply is connected, described
The second end of several second electrodes is respectively by being connected to the cathode of the DC power supply, any electrode after an adjustable resistance
Between the anode of the DC power supply optionally one resistance value detector of series connection with detect it is with corresponding group of detection plus
The resistance value in thermode circuit.
Further, the resistance value detector is multimeter.
The drop stamping plate heating unit of the present invention employs several groups of heating electrode composition heating electrodes, and several groups add
Thermode is set parallel along the length direction of plate, first electrode and second electrode forming circuit in each group of heating electrode,
The electric current of each branch can be adjusted, and sketch plate material can be made to obtain uniform Temperature Distribution, and can be to different zones
Heated current is customized.It can realize the Temperature Distribution of customization, in plate is hot press-formed, initial plate be made to obtain not
Same tissue, intensity adjustable part can be obtained in follow-up drop stamping.
Description of the drawings
Fig. 1 is the circuit diagram of the heater circuit of one embodiment of drop stamping plate heating unit of the present invention.
Fig. 2 is the structure diagram of one embodiment of drop stamping plate heating unit of the present invention.
Fig. 3 is the vertical view of Fig. 2.
Fig. 4 is the enlarged drawing of part A in Fig. 3.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is referred to, the drop stamping plate heating unit of the present embodiment is for heating drop stamping plate, the heat
Punching press plate heating unit includes heater circuit 1, and the heater circuit 1 includes several first electrodes 101, several second electrodes
102nd, several adjustable resistances 103 and DC power supply 104, several first electrodes 101 are along the of the drop stamping plate 300
Side length direction is set parallel, and several second electrodes 102 are symmetrically set in the second side of the drop stamping plate 300, often
An opposite first electrode 101 and a second electrode 102 one group of heating electrode of formation, the first of several first electrodes 101
Hold the first side contacts with the drop stamping plate 300, the second ends of several first electrodes 101 directly with it is described straight
The first end in galvanic electricity source 104 is connected, the first ends of several second electrodes 102 with the drop stamping plate 300 second
Side contacts, the second end of several second electrodes 102 after an adjustable resistance 103 respectively by being connected to the DC power supply
104 second end is optionally connected in series with one between any first electrode 101 and the first end of the DC power supply 104
Resistance value detector is to detect the resistance value of the corresponding heating electrode loop with the corresponding group of detection, so that it is determined that the heating electrode
The regulated quantity of adjustable resistance 103 in circuit.
In the present solution, the first electrode 101 and second electrode 102 of each group of heating electrode form a heating circuit, pass through
Resistance value detector detects the resistance value of the adjustable resistance 103 in this group of electrode, to adjust the heating temperature of heating electrode, so as to
Heating temperature can be adjusted for temperature required for 300 each section of plate.It is adjustable by changing in each group of heating electrode
The size of 103 resistance value of resistance, to realize, electric current is strong at drop stamping plate 300 (blank, hereinafter referred to as plate 300) different cross section
The difference of degree, so as to fulfill the customization of blank temperature distribution so that 300 each section temperature of plate is controllable, improves drop stamping
Product quality.
In this specific embodiment, the second ends of several first electrodes 101 directly with the DC power supply 104 just
Extremely it is connected, the second end of several second electrodes 102 after an adjustable resistance 103 respectively by being connected to the DC power supply
104 cathode, optionally one resistance value of series connection detects between any electrode and the anode of the DC power supply 104
Instrument with detect it is corresponding be connected with second electrode 102 mutually adjust resistance resistance value.
In this specific embodiment, the mode of plug type can be used with detecting each heating electrode in the resistance value detector
Resistance value in circuit.The resistance value detector is multimeter 105.The multimeter 105 can be inserted directly into every one first electricity
To detect the resistance value of the adjustable resistance 103 in corresponding one group of heating electrode between pole 101 and the DC electrode.
The heater circuit 1 further includes another first electrode 101 and another second electrode 102, another first electrode 101
Form another group of heating electrode with another second electrode 102, another second electrode 102 directly with the DC power supply 104
Second end is connected.Group heating electrode can be used as benchmark, in order to which multimeter 105 adjusts above-mentioned resistance value.
300 heating unit of drop stamping plate of the present invention, employs several groups of heating electrodes composition heating electrodes, several groups
Heating electrode is set parallel along the length direction of plate 300, first electrode 101 and second electrode in each group of heating electrode
102 forming circuits, the electric current of each branch can be adjusted, and sketch plate material 300 can be made to obtain uniform Temperature Distribution, Er Qieke
It is customized with the heated current to different zones.It can realize the Temperature Distribution of customization, it is hot press-formed in plate 300
In, initial plate 300 is made to obtain different tissues, intensity adjustable part can be obtained in follow-up drop stamping.
Refer to Fig. 2 to Fig. 4, the drop stamping plate heating unit include it is identical with above-described embodiment structure or function or
Similar heater circuit 1, the drop stamping plate heating unit further include a pedestal 20, the first side on the pedestal 20
First electrode mounting structure 22, be symmetrically set on the pedestal 20 the second electrode mounting structure 24 of the second side and positioned at
Plummer 26 between one electrode mounting structure 22 and second electrode mounting structure 24, the drop stamping plate 300 are set to institute
The upper surface of plummer 26 is stated, several first electrodes 101 are installed on the first electrode mounting structure 22 rear with being placed in
300 first side of drop stamping plate on the plummer 26 is in contact, and several second electrodes 102 are installed on second electricity
It is in contact after on pole mounting structure 24 with 300 the second side of drop stamping plate being placed on the plummer 26.
In the present embodiment, in order to adapt to different shape and size of drop stamping plates 300, the first electrode installation knot
Structure 22 and second electrode mounting structure 24 can be moved to opposite direction or in the opposite direction, so, it is possible by described
First electrode mounting structure 22 and second electrode mounting structure 24 can adjust the spacing distance between them, enable adaptation to
Different in width drop stamping plate 300.Specifically：
The first electrode mounting structure 22 includes the first sliding sleeve 221, the first slide bar 222 and the first erecting bed 223.Institute
The first sliding sleeve 221 is stated set on first side on the top of the pedestal 20, first slide bar 222 is arranged in first sliding sleeve
In 221, towards second electrode mounting structure 24, outer end exposes to first sliding sleeve 221 for the inner end of first slide bar 222
Outside.First erecting bed 223 is fixed on the outer end of first slide bar 222 and is located at the top of first slide bar 222,
The length of first erecting bed 223 and the length of the plummer 26 match, and several first electrodes 101 are along described
The length direction of one erecting bed 223 is fixed on first erecting bed 223 towards the side of second electrode mounting structure 24 parallel.
In the present embodiment, one first fixed ear 224, first installation are provided in the outer end of first slide bar 222
The bottom surface of platform 223 is connect with the top surface of first fixed ear 224.
The quantity of first sliding sleeve 221 can be a set of, and when being a set of, first sliding sleeve 221 is along the pedestal
20 length direction setting, the i.e. length of the first sliding sleeve 221 and the length of the pedestal 20 match.When being a set of, in institute
It states on the first sliding sleeve 221 to be spaced apart along its length and is equipped with multiple first slide openings, the axial direction of first slide opening and described the
The axial direction (length direction) of one sliding sleeve 221 is vertically, corresponding, 222 quantity of the first slide bar and the first slide opening quantity
Match, be arranged in correspondingly in the first slide opening.The quantity of first sliding sleeve 221 is alternatively more sets, cover when to cover more more
The length direction of first sliding sleeve 221 along the pedestal 20 is arranged at intervals at first side on the top of pedestal 20, in every suit first
The first slide opening, the quantity of first slide bar 222 and more set 221 quantity phases of the first sliding sleeve are offered on sliding sleeve 221
Match, be arranged in correspondingly in corresponding first sliding sleeve 221.
In order to enable the position of each first electrode 101 can be adjusted so that in same group of heating electrode
One electrode 101 can be moved to 102 direction of second electrode or be moved to far from 102 direction of second electrode, to adapt to not similar shape
The drop stamping plate 300 of shape, the first electrode mounting structure 22 of the present embodiment further include：It is corresponding with 101 quantity of first electrode
Several first nuts 225 and several first adjusting bolts 226, several first nuts 225 are along first erecting bed 223
Length direction be set to parallel on first erecting bed 223, the outer ends of several first adjusting bolts 226 corresponds
Thread fitting on the first nut 225, inner end connects correspondingly with several insulation of first electrodes 101.
Further, it is respectively arranged with a first insulator 281 in several first electrodes 101, described several
The inner end of one adjusting bolt 226 is insulated by corresponding first insulator 281 with corresponding first electrode 101 to be connected.
The second electrode mounting structure 24 is symmetrical arranged with the first electrode mounting structure 22.The second electrode peace
Assembling structure 24 includes the second sliding sleeve 241, the second slide bar 242 and the second erecting bed 243.Second sliding sleeve 241 is set on described
The second side on the top of pedestal 20, second slide bar 242 are arranged in second sliding sleeve 241, second slide bar 242
Towards first electrode mounting structure 22, outer end exposes to the outside of second sliding sleeve 241 for inner end.Second erecting bed 243
It is fixed on the outer end of second slide bar 242 and positioned at the top of second slide bar 242, the length of second erecting bed 243
It spends and matches with the length of the plummer 26, length direction of several second electrodes 102 along second erecting bed 243
It is fixed on second erecting bed 243 parallel towards the side of first electrode mounting structure 22.
The quantity of second sliding sleeve 241 can be a set of, and when being a set of, second sliding sleeve 241 is along the pedestal
20 length direction setting, the i.e. length of the second sliding sleeve 241 and the length of the pedestal 20 match.When being a set of, in institute
It states on the second sliding sleeve 241 to be spaced apart along its length and is equipped with multiple second slide openings, the axial direction of second slide opening and described the
The axial direction (length direction) of two sliding sleeves 241 is vertically, corresponding, 242 quantity of the second slide bar and the second slide opening quantity
Match, be arranged in correspondingly in the second slide opening.The quantity of second sliding sleeve 241 is alternatively more sets, cover when to cover more more
The length direction of second sliding sleeve 241 along the pedestal 20 is arranged at intervals at the second side on the top of pedestal 20, in every suit second
The second slide opening, the quantity of second slide bar 242 and more set 241 quantity phases of the second sliding sleeve are offered on sliding sleeve 241
Match, be arranged in correspondingly in corresponding second sliding sleeve 241.
In the present embodiment, one second fixed ear 244, second installation are provided in the outer end of second slide bar 242
The bottom surface of platform 243 is connect with the top surface of second fixed ear 244.
In order to enable the position of each second electrode 102 can be adjusted so that in same group of heating electrode
Two electrodes 102 can be moved to 101 direction of first electrode or be moved to far from 101 direction of first electrode, to adapt to not similar shape
The drop stamping plate 300 of shape, the second electrode mounting structure 24 of the present embodiment further include：It is corresponding with 102 quantity of second electrode
Several second nuts 245 and several second adjusting bolts 246, several second nuts 245 are along second erecting bed 243
Length direction be set to parallel on second erecting bed 243, the outer ends of several second adjusting bolts 246 corresponds
Thread fitting on the second nut 245, inner end connects correspondingly with several insulation of second electrodes 102.
Further, it is respectively arranged with a second insulator 282 in several second electrodes 102, described several
The inner end of two adjusting bolts 246 is insulated by corresponding second insulator 282 with corresponding second electrode 102 to be connected.
In the present embodiment, the plummer 26 is insulation plummer 26, and the insulation plummer 26 is set to described first
On 221 and second sliding sleeve 241 of sliding sleeve, an insulating pad 21 is additionally provided on the plummer 26.
The drop stamping plate heating unit of the present invention, first electrode mounting structure 22 and second electrode mounting structure 24 it
Between distance be adjusted so that the distance between first electrode 101 and second electrode 102 for being mounted thereon are adjustable, can
Adapt to the drop stamping plate 300 of different in width.It is connected between respective electrode and nut by adjustable bolt again, it can be independent
The position that any electrode corresponds to drop stamping plate 300 is adjusted, can adapt to, in different shape (such as abnormity) plate 300, make
Along the parallel electrode of 300 length direction of plate can with the shape of plate 300 adjusting position, it is equal that each electrode is effectively ensured
It can contact with plate 300, effectively plate 300 is heated.It compares with traditional electric current heating, it can be according to plate 300
The position of shape adjustment electrode, so the present invention can carry out resistance heating, widened resistance to plate 300 in irregular shape
The application of heating.Multiple electrodes composition heater circuit 1 is employed, the electric current of each branch can be adjusted, and can make sketch plate material
300 obtain uniform Temperature Distribution, and the heated current of different zones can be customized.It can realize the temperature of customization
Degree distribution, in plate 300 is hot press-formed, makes initial plate 300 obtain different tissues, can be obtained in follow-up drop stamping
Obtain intensity adjustable part.
Example is specifically combined, the heat-punch member is illustrated this drop stamping plate heating unit by taking B columns as an example.Please after
It is continuous that referring to Fig. 3, the B columns plate 300 after being cut is sketch plate substantially of a lateral H shape, have width positioned at head end compared with
The stage casing of long first section, the narrower width positioned at the longer endpiece of the width of tail end and between first section and endpiece.Adding
Before heat, the previous B columns plate 300 is placed on plummer 26, then installs first electrode mounting structure 22 and second electrode
Structure 24 is moved to opposite direction, so as to the position of several first electrodes 101 of coarse adjustment and several second electrodes 102 so that the
One electrode 101 and second electrode 102 contact the two sides of longest one section of 300 width of B columns plate first, then fine tuning and B again
The first electrode 101 of the partial response of 300 narrower width of column plate and second electrode 102, so that 300 first side of B columns plate
First electrode 101 be in contact with it, the second electrode 102 of 300 the second side of B columns plate is in contact with it, each so as to ensure
Electrode is in contact with B columns plate 300, makes all to be clamped by electrode in the width direction of plate 300.In this way, positioned at same disconnected
The first electrode 101 and second electrode 102 in face form one group of heating electrode, and the part near the section is heated.To protect
Card 300 temperature of plate is uniformly distributed, and the resistance sizes of each branch are measured using universal meter, are adjusted by adjustable resistance 103
Resistance sizes.After integrated circuit is set, power on progress plate 300 and heat.To realize the intensity adjustable forming of part,
By 103 regulation resistance size of adjustable resistance, 300 different zones heated current size of plate is customized, plate 300 is made to obtain difference
Initial structure.
It these are only embodiments of the present invention, be not intended to limit the scope of the invention, it is every to utilize the present invention
The equivalent structure or equivalent flow shift that specification and accompanying drawing content are made directly or indirectly is used in other relevant technologies
Field is included within the scope of the present invention.
Claims (4)
1. a kind of drop stamping plate heating unit, for heating to drop stamping plate, including a heater circuit, feature
It is：The heater circuit includes several first electrodes, several second electrodes, several adjustable resistances and DC power supply, described
Several first electrodes are set parallel along the first side length direction of the drop stamping plate, and several second electrodes are symmetrically set in
The second side of the drop stamping plate, an often opposite first electrode and a second electrode form one group of heating electrode, if described
First side contacts of the first end of dry first electrode with the drop stamping plate, the second end of several first electrodes are straight
Connect and be connected with the first end of the DC power supply, the first ends of several second electrodes with the drop stamping plate second
Side contacts, the second end of several second electrodes after an adjustable resistance respectively by being connected to the second of the DC power supply
End, is optionally connected in series with a resistance value detector to examine between any first electrode and the first end of the DC power supply
Survey the resistance value of the heating electrode loop of corresponding group.
2. drop stamping plate heating unit as described in claim 1, it is characterised in that：The heater circuit further includes another
One electrode and another second electrode, another first electrode and another second electrode form another group of heating electrode, this another the
Second end of two electrodes directly with the DC power supply is connected.
3. drop stamping plate heating unit as described in claim 1, it is characterised in that：The second end of several first electrodes
Anode directly with the DC power supply is connected, and the second end of several second electrodes after an adjustable resistance respectively by connecting
The cathode of the DC power supply is connected to, optionally series connection one between any electrode and the anode of the DC power supply
Resistance value detector detects the resistance value for heating electrode loop for corresponding to group to detect.
4. drop stamping plate heating unit as claimed any one in claims 1 to 3, it is characterised in that：The resistance value inspection
Survey instrument is multimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451878.7A CN108176772A (en) | 2017-12-27 | 2017-12-27 | Drop stamping plate heating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451878.7A CN108176772A (en) | 2017-12-27 | 2017-12-27 | Drop stamping plate heating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108176772A true CN108176772A (en) | 2018-06-19 |
Family
ID=62548103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711451878.7A Pending CN108176772A (en) | 2017-12-27 | 2017-12-27 | Drop stamping plate heating unit |
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| JP2002248525A (en) * | 2001-02-22 | 2002-09-03 | Sumitomo Metal Ind Ltd | Method for hot pressing metal plate and apparatus therefor |
| KR20130100076A (en) * | 2013-08-05 | 2013-09-09 | 현대하이스코 주식회사 | Method for manufacturing high strength steel shaped body |
| CN204321400U (en) * | 2014-12-15 | 2015-05-13 | 天津市科华焊接设备有限公司 | There is multiple electrode and depress the welding machine of mesh that single electrode welds respectively simultaneously |
| CN106470777A (en) * | 2014-06-24 | 2017-03-01 | 高周波热錬株式会社 | The manufacture method of heating means, heater and compressing product |
| CN106825185A (en) * | 2016-11-25 | 2017-06-13 | 机械科学研究总院先进制造技术研究中心 | A kind of superplastic forming equipment platform heating means |
| CN207770640U (en) * | 2017-12-29 | 2018-08-28 | 重庆江东机械有限责任公司 | Drop stamping plate heating device |
-
2017
- 2017-12-27 CN CN201711451878.7A patent/CN108176772A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002248525A (en) * | 2001-02-22 | 2002-09-03 | Sumitomo Metal Ind Ltd | Method for hot pressing metal plate and apparatus therefor |
| KR20130100076A (en) * | 2013-08-05 | 2013-09-09 | 현대하이스코 주식회사 | Method for manufacturing high strength steel shaped body |
| CN106470777A (en) * | 2014-06-24 | 2017-03-01 | 高周波热錬株式会社 | The manufacture method of heating means, heater and compressing product |
| CN204321400U (en) * | 2014-12-15 | 2015-05-13 | 天津市科华焊接设备有限公司 | There is multiple electrode and depress the welding machine of mesh that single electrode welds respectively simultaneously |
| CN106825185A (en) * | 2016-11-25 | 2017-06-13 | 机械科学研究总院先进制造技术研究中心 | A kind of superplastic forming equipment platform heating means |
| CN207770640U (en) * | 2017-12-29 | 2018-08-28 | 重庆江东机械有限责任公司 | Drop stamping plate heating device |
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Application publication date: 20180619 |