CN103862233B - There is the preparation method of ripple layer sandwich structure composite plate - Google Patents

There is the preparation method of ripple layer sandwich structure composite plate Download PDF

Info

Publication number
CN103862233B
CN103862233B CN201410048716.9A CN201410048716A CN103862233B CN 103862233 B CN103862233 B CN 103862233B CN 201410048716 A CN201410048716 A CN 201410048716A CN 103862233 B CN103862233 B CN 103862233B
Authority
CN
China
Prior art keywords
ripple
layer
laminboard layer
preparation
sandwich structure
Prior art date
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.)
Expired - Fee Related
Application number
CN201410048716.9A
Other languages
Chinese (zh)
Other versions
CN103862233A (en
Inventor
陶杰
王文涛
郭训忠
潘蕾
蔡雷
朱建平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANGSU CHENGFEI PRECISION ALLOY CO Ltd
Nanjing University of Aeronautics and Astronautics
Original Assignee
JIANGSU CHENGFEI PRECISION ALLOY CO Ltd
Nanjing University of Aeronautics and Astronautics
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JIANGSU CHENGFEI PRECISION ALLOY CO Ltd, Nanjing University of Aeronautics and Astronautics filed Critical JIANGSU CHENGFEI PRECISION ALLOY CO Ltd
Priority to CN201410048716.9A priority Critical patent/CN103862233B/en
Publication of CN103862233A publication Critical patent/CN103862233A/en
Application granted granted Critical
Publication of CN103862233B publication Critical patent/CN103862233B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The invention discloses a kind of preparation method with ripple layer sandwich structure composite plate, belong to sheet metal manufacturing technology field.The present invention has the preparation method of ripple layer sandwich structure composite plate, comprises and first prepares ripple laminboard layer; Hollow parts to ripple laminboard layer adds passive plug; Ripple laminboard layer and the connection up and down between metal decking is realized by explosive welding; After taking out plug, obtain that there is ripple sandwich structure composite plate.The present invention can obtain than the higher-quality metallurgical binding intensity of soldering and interface, and achieve the connection between foreign material central layer and panel, it is prepared, and speed is fast, efficiency is high, preparation cost is low simultaneously.

Description

There is the preparation method of ripple layer sandwich structure composite plate
Technical field
The present invention relates to a kind of preparation method of laminboard layer composite plate, is specifically a kind of preparation method with ripple layer sandwich structure composite plate, belongs to sheet metal manufacturing technology field.
Background technology
At present, the composite plate with ripple layer sandwich structure obtains at Aeronautics and Astronautics engineering field to be applied widely, in the overall structure performance improving Aeronautics and Astronautics device, reduces weight and improve the aspects such as heat-proof quality having played important function.
The composite plate that existing manufacture has ripple layer sandwich structure mainly adopts superplasticforming/diffusion welding method and brazing, and it has the following disadvantages: (1), shape are single.The method only can directly prepare the composite plate with trapezoidal ripple sandwich structure, cannot be used for the preparation with radian shape, baroque ripple layer sandwich structure composite plate.(2), composite surface is of low quality, the region of especially diffusion welding (DW), and in superplasticforming process, panel and ripple laminboard layer are being connected with not to be connected the pulling force that intersection receives larger, very easily produce groove phenomenon.(3), the method is only applicable to the ripple laminboard layer situation identical with panel material, cannot be applicable to the connection for foreign material between ripple laminboard layer and panel.(4), bond strength is not high.Utilize method for welding to be connected with upper and lower panel by ripple laminboard layer, because soldering joint strength is far below mother metal, when high temperature, mechanical property does not reach the instructions for use in Aeronautics and Astronautics field.
Summary of the invention
Technical problem to be solved by this invention is to overcome above-mentioned defect, provides a kind of and can prepare various shape, the simple efficient and preparation method with ripple layer sandwich structure composite plate that can be applicable to/foreign material of high, the step of bond strength between panel and central layer.
In order to solve the problems of the technologies described above, the preparation method with ripple layer sandwich structure composite plate provided by the invention, comprises the following steps:
1) ripple laminboard layer, is prepared;
2) hollow parts, to ripple laminboard layer adds passive plug;
3), ripple laminboard layer and the connection up and down between metal decking is realized by explosive welding;
4), take out after plug, obtain that there is ripple sandwich structure composite plate.
In the present invention, the preparation process of described ripple laminboard layer is:
1) die with square wave, trapezoidal wave, triangular wave or sine waveform, is processed into stainless steel;
2), by titanium alloy plate be laid on die, then by be embossed on titanium alloy plate;
3), the mould assembled is put into heating furnace, mechanical pressurization is carried out to patrix, guarantee sealing, and by mold heated to titanium alloy superplastic forming temperature, pass into argon gas by the air inlet of patrix simultaneously, superplasticforming is carried out to titanium alloy plate material, after cooling, obtains titanium alloy ripple laminboard layer.
In the present invention, the preparation process of described ripple laminboard layer is:
1) die with square wave, trapezoidal wave, triangular wave or sine waveform, is processed into stainless steel;
2), by flat aluminium alloy plate be laid on die, then by be embossed on flat aluminium alloy plate;
3), the mould assembled is put into heating furnace, mechanical pressurization is carried out to patrix, and by mold heated to superplastic aluminum alloy forming temperature, passes into argon gas by the air inlet of patrix simultaneously, superplasticforming is carried out to aluminium horizontal sheet material, after cooling, obtains aluminium alloy ripple laminboard layer.
In the present invention, described step 2) be:
1), preparation and die have the core rod mould of identical bellows-shaped;
2), in core rod mould pour into a mould low-melting alloy, after cooling, load the hollow parts of ripple laminboard layer as plug.
In the present invention, described step 2) be: after soldering and sealing is carried out at the two ends of ripple laminboard layer hollow parts, the hollow parts to ripple laminboard layer injects low-melting alloy, after cooling as supporting plug.
In the present invention, in described step 2) be: machining inserts the hollow parts of ripple laminboard layer after going out the carbon steel plug identical with ripple laminboard layer bellows-shaped.
In the present invention, described step 3) in blast process be:
1) connecting portion, between ripple laminboard layer and upper and lower panel spreads emulsion;
2), be clipped between upper and lower panel by ripple laminboard layer, ignition charge realizes welding.
In the present invention, described upper and lower panel is titanium alloy sheet or aluminium alloy plate.
In the present invention, described ripple laminboard layer, top panel and lower panel are same material or foreign material.
Beneficial effect of the present invention: the present invention has the following advantages: (1), the present invention utilize Explosion composite to realize the connection of sandwich layer and panel, can obtain than the higher-quality metallurgical binding intensity of soldering and interface, achieve the connection between foreign material central layer and panel simultaneously; (2), the present invention utilizes super plastic forming method to be shaped separately to laminboard layer, and the ripple laminboard layer reducing reflected rate simultaneously of the complicated shape that can be shaped, ensures the precision be shaped; (3), compared with the method for attachment such as soldering and diffusion, the present invention prepares that speed is fast, efficiency is high, preparation cost is low.
Accompanying drawing explanation
Fig. 1 is preparation method's flow chart that the present invention has ripple layer sandwich structure composite plate;
Fig. 2 is ripple laminboard layer die structure dwg;
Fig. 3 is ripple laminboard layer mold sections figure;
Fig. 4 is the mould schematic diagram after assembling;
Fig. 5 is the ripple laminboard layer schematic diagram after being shaped;
Fig. 6 is mandrel form schematic diagram;
Fig. 7 is explosive welding schematic diagram;
Fig. 8 is the composite layered plate with ripple sandwich structure;
In figure, 1-die, 2-patrix, 3-air inlet, 4-metallic plate, 5-top panel, 6-lower panel, 7-plug, 8-explosive welding position.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the preparation method that the present invention has ripple layer sandwich structure composite plate is described further.
embodiment 1
The first step, is of a size of the die 1 of 260mm × 260mm × 40mm with 321 stainless steels (1Cr8Ni9Ti) machining profile, die 1 is sinusoidal wave, sinusoidal wave wavelength is 60mm, and wave amplitude is 30mm, for the manufacture of ripple laminboard layer, as shown in Figure 2,3;
Second step, is laid in the TC4 titanium alloy plate 4 being of a size of 260mm × 260mm × 1.5mm on die 1, then is pressed on TC4 titanium alloy plate 4 by patrix 2, as shown in Figure 4;
3rd step, puts into heating furnace by the mould assembled, and carries out mechanical pressurization, to ensure sealing to patrix 2; Simultaneously by mold heated to 900-920 DEG C, pass into argon gas by the air inlet 3 of patrix 2 simultaneously, superplasticforming carried out to TC4 titanium alloy plate 4, cooling after take out obtain TC4 titanium alloy ripple laminboard layer, as shown in Figure 4,5;
4th step, manufacture and die 1 have the core rod mould of identical bellows-shaped, and low-melting alloy is poured into a mould in core rod mould, low-melting alloy plug 7 is taken out after its cooling, and loaded the hollow position of TC4 titanium alloy ripple laminboard layer, plug 7 plays a supportive role when explosive welding, as shown in Figure 6;
5th step, when the explosive welding position 8(between TC4 titanium alloy ripple laminboard layer and upper TC4 titanium alloy panel 5, lower TC4 titanium alloy panel 6 and TC4 titanium alloy ripple laminboard layer are clipped in the middle of upper and lower panel and upper and lower panel contact site) spread emulsion; Then be clipped between upper and lower TC4 titanium alloy panel, electricity consumption cap sensitive explosive realizes welding between upper and lower TC4 titanium alloy panel with TC4 titanium alloy ripple laminboard layer, as shown in Figure 7;
6th step, puts into water by composite plate after blast, and after being heated to water boiling, namely low-melting alloy plug can melt and flow out from composite plate, and final acquisition has the composite plate of ripple sandwich structure, as shown in Figure 8.
embodiment 2
The first step, is of a size of the die of 260mm × 260mm × 40mm with 321 stainless steels (1Cr8Ni9Ti) machining profile, die 1 is trapezoidal wave, and the wavelength of trapezoidal wave is 60mm, and wave amplitude is 30mm, for the manufacture of ripple laminboard layer;
Second step, 5083 flat aluminium alloy plates that will be of a size of 260mm × 260mm × 2.5mm are laid on die, then by be embossed on 5083 flat aluminium alloy plates;
3rd step, puts into heating furnace by the mould assembled, and carries out mechanical pressurization to patrix, to ensure sealing; Simultaneously by mold heated to 500-535 DEG C, pass into argon gas by the air inlet of patrix simultaneously, superplasticforming carried out to 5083 flat aluminium alloy plates, cooling after take out obtain 5083 aluminium alloy ripple laminboard layers;
4th step, soldering and sealing is carried out at the two ends of 5083 aluminium alloy ripple laminboard layer hollow parts after shaping, hollow parts afterwards directly to 5083 aluminium alloy ripple laminboard layers injects low-melting alloy, after cooling the soldering and sealing at two ends is cut off, form low-melting alloy plug, plug plays a supportive role when explosive welding;
5th step, 5083 aluminium alloy ripple laminboard layers and on 5083 aluminium alloy panel, explosive welding position between lower 5083 aluminium alloy panel (when namely 5083 aluminium alloy ripple laminboard layers are clipped in upper and lower panel centre and upper and lower panel contact site) spread emulsion; Then be clipped between upper and lower 5083 aluminium alloy panel, electricity consumption cap sensitive explosive realizes welding between upper and lower 5083 aluminium alloy panel with 5083 aluminium alloy ripple laminboard layers;
6th step, puts into water by composite plate after blast, and after being heated to water boiling, namely low-melting alloy plug can melt and flow out from composite plate, and final acquisition has the composite plate of ripple sandwich structure.
embodiment 3
The first step, is of a size of the die 1 of 260mm × 260mm × 40mm with 321 stainless steels (1Cr8Ni9Ti) machining profile, die 1 is square wave, and the wavelength of square wave is 60mm, and wave amplitude is 30mm, for the manufacture of ripple laminboard layer;
Second step, is laid in the TC4 titanium alloy plate being of a size of 260mm × 260mm × 1.5mm on die, then by be embossed on TC4 titanium alloy plate;
3rd step, puts into heating furnace by the mould assembled, and carries out mechanical pressurization to patrix, to ensure sealing; Simultaneously by mold heated to 900-920 DEG C, pass into argon gas by the air inlet of patrix simultaneously, superplasticforming carried out to TC4 titanium alloy plate, cooling after take out obtain TC4 titanium alloy ripple laminboard layer;
4th step, the plug of the carbon steel material identical with TC4 titanium alloy ripple laminboard layer bellows-shaped is gone out by machining, and at mandrel surface coating butter solder resist, be inserted into the hollow parts of TC4 titanium alloy ripple laminboard layer, plug plays a supportive role when explosive welding;
5th step, TC4 titanium alloy ripple laminboard layer and on 5083 aluminium alloy panel, explosive welding position between lower 5083 aluminium alloy panel (when namely TC4 titanium alloy ripple laminboard layer is clipped in upper and lower panel centre and upper and lower panel contact site) spread emulsion; Then be clipped between upper and lower 5083 aluminium alloy panel, electricity consumption cap sensitive explosive realizes welding between upper and lower 5083 aluminium alloy panel with TC4 titanium alloy ripple laminboard layer;
6th step, extracts the carbon steel plug in composite plate out, and final acquisition has the heterogeneous material composite plate of ripple sandwich structure.
embodiment 4
The first step, is of a size of the die 1 of 260mm × 260mm × 40mm with 321 stainless steels (1Cr8Ni9Ti) machining profile, die 1 is triangular waveform, and leg-of-mutton wavelength is 60mm, and wave amplitude is 30mm, for the manufacture of ripple laminboard layer;
Second step, is laid in the TC4 titanium alloy plate being of a size of 260mm × 260mm × 1.5mm on die, then by be embossed on TC4 titanium alloy plate;
3rd step, puts into heating furnace by the mould assembled, and carries out mechanical pressurization to patrix, to ensure sealing; Simultaneously by mold heated to 900-920 DEG C, pass into argon gas by the air inlet of patrix simultaneously, superplasticforming carried out to TC4 titanium alloy plate, cooling after take out obtain TC4 titanium alloy ripple laminboard layer;
4th step, the plug of the cross section carbon steel material identical with TC4 titanium alloy ripple laminboard layer bellows-shaped is gone out by machining, and at mandrel surface coating butter solder resist, be inserted into the hollow parts of TC4 titanium alloy ripple laminboard layer, plug plays a supportive role when explosive welding;
5th step, TC4 titanium alloy ripple laminboard layer and on 2124 aluminium alloy panel, explosive welding position between lower 5083 aluminium alloy panel (when namely TC4 titanium alloy ripple laminboard layer is clipped in upper and lower panel centre and upper and lower panel contact site) spread emulsion; Then be clipped between 2124 aluminium alloy panel, lower 5083 aluminium alloy panel, electricity consumption cap sensitive explosive realizes upper 2124 aluminium alloy panel, lower welding between 5083 aluminium alloy panel with TC4 titanium alloy ripple laminboard layer;
6th step, extracts the carbon steel plug in composite plate out, and final acquisition has the heterogeneous material composite plate of ripple sandwich structure.
Stainless steel die waveform in above-described embodiment can be selected according to actual needs or make other conversion between square wave, trapezoidal wave, triangular wave or sine wave.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.

Claims (5)

1. there is a preparation method for ripple layer sandwich structure composite plate, it is characterized in that comprising the following steps:
1) ripple laminboard layer, is prepared;
2) hollow parts, to ripple laminboard layer adds passive plug:
First preparation and die have the core rod mould of identical bellows-shaped; Secondly in core rod mould, pour into a mould low-melting alloy, after cooling, load the hollow parts of ripple laminboard layer as plug;
Or after soldering and sealing is carried out at the two ends of ripple laminboard layer hollow parts, the hollow parts to ripple laminboard layer injects low-melting alloy, after cooling as supporting plug;
3), ripple laminboard layer and the connection up and down between metal decking is realized by explosive welding;
4), take out after plug, obtain that there is ripple sandwich structure composite plate.
2. the preparation method with ripple layer sandwich structure composite plate according to claim 1, is characterized in that the preparation process of described ripple laminboard layer is:
1) die with square wave, trapezoidal wave, triangular wave or sine waveform, is processed into stainless steel;
2), by titanium alloy plate be laid on die, then by be embossed on titanium alloy plate;
3), the mould assembled is put into heating furnace, mechanical pressurization is carried out to patrix, guarantee sealing, and by mold heated to the superplastic forming temperature of titanium alloy, pass into argon gas by the air inlet of patrix simultaneously, superplasticforming is carried out to titanium alloy plate, after cooling, obtains titanium alloy ripple laminboard layer.
3. the preparation method with ripple layer sandwich structure composite plate according to claim 1, is characterized in that the preparation process of described ripple laminboard layer is:
1) die with square wave, trapezoidal wave, triangular wave or sine waveform, is processed into stainless steel;
2), by flat aluminium alloy plate be laid on die, then by be embossed on flat aluminium alloy plate;
3), the mould assembled is put into heating furnace, mechanical pressurization is carried out to patrix, guarantee sealing, and by mold heated to the superplastic forming temperature of aluminium alloy, pass into argon gas by the air inlet of patrix simultaneously, superplasticforming is carried out to aluminium horizontal sheet material, after cooling, obtains aluminium alloy ripple laminboard layer.
4. the preparation method with ripple layer sandwich structure composite plate according to any one of claims 1 to 3, is characterized in that described step 3) in blast process be:
1) connecting portion, between ripple laminboard layer and upper and lower panel spreads emulsion;
2), be clipped between upper and lower panel by ripple laminboard layer, ignition charge realizes welding.
5. the preparation method with ripple layer sandwich structure composite plate according to claim 4, is characterized in that: described upper and lower panel is titanium alloy sheet or aluminium alloy plate.
CN201410048716.9A 2014-02-12 2014-02-12 There is the preparation method of ripple layer sandwich structure composite plate Expired - Fee Related CN103862233B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410048716.9A CN103862233B (en) 2014-02-12 2014-02-12 There is the preparation method of ripple layer sandwich structure composite plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410048716.9A CN103862233B (en) 2014-02-12 2014-02-12 There is the preparation method of ripple layer sandwich structure composite plate

Publications (2)

Publication Number Publication Date
CN103862233A CN103862233A (en) 2014-06-18
CN103862233B true CN103862233B (en) 2016-04-27

Family

ID=50901575

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410048716.9A Expired - Fee Related CN103862233B (en) 2014-02-12 2014-02-12 There is the preparation method of ripple layer sandwich structure composite plate

Country Status (1)

Country Link
CN (1) CN103862233B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104723579B (en) * 2015-04-13 2017-03-22 哈尔滨工业大学 Assembling mold for all-composite corrugated sandwich cylindrical shells
CN106881561A (en) * 2015-12-15 2017-06-23 航天特种材料及工艺技术研究所 A kind of preparation method of titanium alloy thin wall multilayer hollow structure
CN108160978A (en) * 2018-02-09 2018-06-15 中国科学技术大学 A kind of production method of high temperature impact resistance heat exchanger
CN108161210B (en) * 2018-02-09 2023-10-20 中国科学技术大学 Self-hardening filling type hollow structure explosion composite board and manufacturing method thereof
CN109318541B (en) * 2018-09-13 2021-06-29 北京理工大学 Bidirectional corrugated lattice reinforced composite material sandwich structure
CN113133270A (en) * 2020-01-14 2021-07-16 航天海鹰(哈尔滨)钛业有限公司 Confined space forced cooling system based on special-shaped diffusion welding water-cooling plate
CN114776747B (en) * 2022-03-15 2023-09-22 东北大学 Composite hyperbolic corrugated sandwich structure for inhibiting vibration of lubricating oil tank of aero-engine and application thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52129726A (en) * 1976-04-25 1977-10-31 Showa Gouhan Kk Production method of inorganic corrugated composite board
JPH01245923A (en) * 1988-03-25 1989-10-02 Mitsubishi Heavy Ind Ltd Controlling method for thickness distribution of superplastic forming parts
JPH06269961A (en) * 1993-03-19 1994-09-27 Yamaki Kogyo Kk Production of composite material
CN1189284C (en) * 2002-01-04 2005-02-16 大连理工大学 Composite metal material explosion welding technology with shape protection function
CN2627424Y (en) * 2003-01-09 2004-07-21 张志良 Explosion-welded red copper plate tube solar heat collecting device
CN202826578U (en) * 2012-08-29 2013-03-27 宁波红杉高新板业有限公司 Corrugated core type composite board
CN103071908B (en) * 2013-01-18 2014-11-12 中国人民解放军理工大学野战工程学院 Explosive welding method of arranging multiple reinforcing ribs between large-area double-layer steel plates

Also Published As

Publication number Publication date
CN103862233A (en) 2014-06-18

Similar Documents

Publication Publication Date Title
CN103862233B (en) There is the preparation method of ripple layer sandwich structure composite plate
US10363592B2 (en) Method for preparing metal composite plate strip by rolling
US11241725B2 (en) Method for rolling metal composite plate strip
CN104722702B (en) Supercritical unit high temperature steam pipeline forging molding process
CN104209697B (en) The preparation method of a kind of laminar titanium aluminum composite plate
CN103612007B (en) A kind of preparation method of high-temperature alloy three-dimensional lattice sandwich structure
CN102744517B (en) Method for manufacturing dual-phase stainless steel hollow sandwich structure element
CN101934432B (en) Coaxial composite welding method of laser spot welding and resistance spot welding
CN110539138A (en) Preparation method of aluminum alloy lightweight active cooling structural skin
CN107344431A (en) A kind of honeycomb ripple composite lattice sandwich cylindrical shell and preparation method thereof
CN107470483A (en) The flat no riveting joint forming device of direct sensing heating and technique of lightweight sheet material
CN106891598B (en) A kind of wavy channel core sandwich and preparation method thereof
CN105537363A (en) Molding device and method for heat expansion of aluminum alloy hollow part
CN103736956B (en) A kind of magnesium alloy semi solid state piles up forming method
CN202944564U (en) Connecting structure for pelvic fin and control cabin
CN102658612B (en) Appearance-adjustable wind-powered blade forming mold and deformation method thereof
CN204300057U (en) A kind of flange assembly
CN103753132B (en) There is the part preparation method of Ti/TixAly/Ti sandwich construction
CN102848101B (en) A kind of two constituent element Al powder thermit powders for aluminium alloy electric welding resistance
CN105350651A (en) Long-span steel truss-concrete composition roofing integral lifting method
CN202764077U (en) Appearance-adjustable forming mold for wind power vane
CN203485439U (en) Ultrasonic spot welding machine provided with double welding joints
CN205077116U (en) Steel billet heating furnace walking beam who can local dismantlement changes
CN205706876U (en) Semitrailer girder
CN203696228U (en) Continuous preparation device for material with honeycomb structure

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160427

Termination date: 20190212