CN211247992U - Bending forming die for stainless steel plate - Google Patents

Bending forming die for stainless steel plate Download PDF

Info

Publication number
CN211247992U
CN211247992U CN201922262790.1U CN201922262790U CN211247992U CN 211247992 U CN211247992 U CN 211247992U CN 201922262790 U CN201922262790 U CN 201922262790U CN 211247992 U CN211247992 U CN 211247992U
Authority
CN
China
Prior art keywords
die
bending
main body
thickness
face
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.)
Active
Application number
CN201922262790.1U
Other languages
Chinese (zh)
Inventor
张大胜
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.)
Guangzhou Dingli Metal Products Co ltd
Original Assignee
Guangzhou Dingli Metal Products Co ltd
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 Guangzhou Dingli Metal Products Co ltd filed Critical Guangzhou Dingli Metal Products Co ltd
Priority to CN201922262790.1U priority Critical patent/CN211247992U/en
Application granted granted Critical
Publication of CN211247992U publication Critical patent/CN211247992U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The utility model provides a bending forming die for stainless steel plates, which is arranged on a bending forming machine, wherein the bending forming machine comprises a support frame and a workbench, and a bending upper die is connected with the lower end part of the support frame and comprises a first upper die and a second upper die; the first upper die is used for bending a stainless steel plate with the thickness of 2 mm-2.5 mm; the second upper die is used for bending a stainless steel plate with the thickness of 3 mm-6.5 mm; the first upper die comprises a first die shank and a first main body; the second upper die comprises a second die shank and a second main body; the end face, facing the support frame, of the workbench is connected with a lower bending die, and the lower bending die comprises a first lower die set and a second lower die; the first lower die set and the second lower die are connected with the workbench through the base; the first lower die set comprises eight die bodies with different lengths. The user can select and use or combine the stainless steel plates with different widths or directly select the second lower die with the length of 3200 mm.

Description

Bending forming die for stainless steel plate
Technical Field
The utility model belongs to the technical field of the forming die technique of bending and specifically relates to a forming die that bends for corrosion resistant plate material is related to.
Background
The bender belongs to one of forging machinery, mainly acts on the metalworking trade, and its product extensively is applicable to: light industry, aviation, ship, metallurgy, instrument, electrical appliance, stainless steel product, steel structure building and decoration industry. At present, a bending machine is a preferred machine for sheet metal processing of sheet materials, particularly large sheet materials, and has the function of pressing a steel plate into parts with various shapes according to process requirements, and the sheet materials can be subjected to edge bending, stretching, rounding, punching and the like by matching various different dies. The existing bending machine needs to replace different dies to realize bending of the plate in different degrees; for example, a car wall, a car roof and the like of an elevator need to use stainless steel plates, and the stainless steel plates need to be bent to different degrees, and a bending forming die is a tool for forming and processing the plates by a bending machine and is matched with the bending machine to use the bent plates; the bending forming die is composed of various parts, and different dies are composed of different parts. The processing of the shape of an article is realized mainly through the change of the physical state of a formed material, and the processing tool is used for enabling a blank to be a tool of a workpiece with a specific shape and a specific size under the pressure action of a bending machine. The bending forming die is provided with an upper bending die and a lower bending die and is used for stamping and separating a plate. At present, the market demands the die of the numerical control bending machine, not only the quantity increase, but also the quality improvement. The bending molding of the stainless steel plate is more common, the width of the surface of the stainless steel plate is various and generally cannot exceed 3200 mm; the stainless steel plates have various thicknesses, so that the number of bending forming dies for the stainless steel plates with different sizes is large; the structural rigidity of the upper bending die determines the stability during punch forming, and the forming groove of the lower bending die determines the forming effect of the stainless steel plate; generally, when bending and forming operation is performed, a stainless steel plate is placed on a bending machine, a lower bending die needs to be fixedly installed on the bending machine, the stainless steel plate needing to be bent is placed on a forming groove of the lower bending die, and then the upper bending die is controlled to be pressed downwards, so that the bending and forming operation is completed. Therefore, in order to complete the bending operation of the stainless steel plates with different widths, the lower bending die needs to be provided with the forming grooves with corresponding lengths, and in actual operation, the lower bending die needs to be replaced ceaselessly for the stainless steel plates with different widths, so that the problem of inconvenience in use is caused. In addition, the design of the bending upper die structure is related to the bending forming effect and the yield.
Therefore, in order to solve the problems in the prior art, it is important to provide a bending mold for stainless steel plates, which has a simple structure, a plurality of widths, and a stable and good structural rigidity.
SUMMERY OF THE UTILITY MODEL
The utility model aims to avoid the defects in the prior art and provide a bending forming die for stainless steel plates, wherein the upper bending die of the bending forming die is provided with two specific structures (namely a first upper die and a second upper die) which are respectively used for bending the stainless steel plates with the thickness of 2 mm-2.5 mm and 3 mm-6.5 mm; and the lower mould of bending is equipped with two kinds, is first lower mould and second lower mould respectively, and the die body of multiple different length is through setting up to first module, and the user can select to use or use in combination in the face of the actual demand of the stainless steel panel of different width, perhaps directly selects the second lower mould that length is 3200 mm.
The purpose of the utility model is realized through the following technical scheme:
a bending forming die for stainless steel plates is mounted on a bending forming machine, the bending forming machine comprises a support frame and a workbench, and the support frame is arranged above the workbench; the bending forming die comprises an upper bending die and a lower bending die; the bending upper die is connected with the lower end part of the support frame, the end face, facing the support frame, of the workbench is connected with a bending lower die, and the bending upper die and the bending lower die are arranged correspondingly;
the bending upper die comprises a first upper die and a second upper die;
the first upper die is used for bending a stainless steel plate with the thickness of 2 mm-2.5 mm;
the second upper die is used for bending a stainless steel plate with the thickness of 3 mm-6.5 mm;
the first upper die comprises a first die shank and a first main body; the height of the first die shank is 30mm, and the thickness of the first die shank is 13 mm; the wall surface of the first die handle part is inwards sunken to form a die neck, so that the first die handle is provided with a notch which is embedded and connected with the lower end part of the support frame; the height of the die neck is 10.5mm, and the thickness of the die neck is four fifths of that of the first die handle;
the height of the first body is 149mm, and the thickness of the first body is less than or equal to 48 mm; the first main body is provided with a head part, a middle part and a tail part, the thickness of the head part is 48mm, the thickness of the middle part is 20mm, and the thickness of the tail part is gradually reduced from the middle part downwards; the tail end of the first main body is provided with a first bending tip;
the end face of the head of the first main body is inwards bent by 45 degrees and extends to the middle of the first main body to form connection, the height of the part, which is not bent, of the head of the first main body is 30mm, two end faces of the middle of the first main body are parallel, the tail of the first main body comprises a first end face and a second end face, an included angle formed by the first end face and the connected middle end face of the first main body is 170 degrees, an included angle formed by the second end face and the connected middle end face of the second end face of the first main body is 158 degrees, the tail end of the first end face is provided with an outward-protruding bent angle, and the tail end of the second end face is bent towards the direction; the height of the tail part is 45.75 mm; the included angle of the first bending tip is 84 degrees;
the second upper die comprises a second die shank and a second main body; the height of the second die shank is 22mm, and the thickness of the second die shank is 13 mm; the height of the second main body is 183mm, and the thickness of the second main body is smaller than or equal to 22 mm; the second body has a head, a middle, and a tail; wherein, the thickness of the head part is 22mm, the height thereof is 35mm, the thickness of the middle part is 18mm, the height thereof is 98mm, and the thickness of the tail part thereof is gradually reduced from the middle part downwards; the tail end of the second main body is provided with a second bent tip;
the head of the second main body is bent inwards by 15 degrees from the end face with the height of 20mm and extends to the middle of the second main body to form connection; the height of the part of the head of the second main body, which is not bent, is 20mm, and the height of the bent part is 15 mm; the two end faces of the middle part of the second main body are parallel, and the included angle of a second bent tip at the tail end of the second main body is 30 degrees;
the bending lower die comprises a first lower die set and a second lower die; the first lower die set and the second lower die are connected with the workbench through the base; the base is provided with a fixing groove for fixedly placing the first lower die set or the second lower die, and the length of the fixing groove is 3200 mm;
the first lower die set comprises eight die bodies with different lengths, and the lengths of the eight die bodies are respectively 50mm, 80mm, 90mm, 100mm, 150mm, 200mm, 250mm and 2280 mm;
the second lower die comprises a die body with the length of 3200 mm;
the die bodies are provided with forming grooves corresponding to the bending tips of the bending upper die.
Specifically, the first upper die, the second upper die, the first lower die set and the second lower die can be combined and used at will, namely the first upper die can be combined with the first lower die set and the second lower die set to form a bending die for use, or the second upper die is combined with the first lower die set and the second lower die set to form a bending die for use; the specific use condition is determined according to the property of the stainless steel plate, if the thickness of the stainless steel plate is 2mm and the width of the stainless steel plate is 350mm, a first upper die and a first lower die set are selected, wherein a 200mm die body and a 150mm die body of the first lower die set are selected for splicing, and the bending operation of the stainless steel plate is completed.
Specifically, the first upper die and the second upper die are designed into two different structures according to different thicknesses of the stainless steel plate, and the rigidity and the bending strength of the second upper die are required to be larger than those of the first upper die due to the fact that the thickness of the stainless steel plate with the thickness of 3-6.5 mm is larger than that of the stainless steel plate with the thickness of 2-2.5 mm. Therefore, the technical scheme provides two different bending upper dies for two stainless steel plates with different thickness ranges for use.
Preferably, the molding groove of the die body is a right-angle groove.
Specifically, the forming groove is a right-angle groove, and the bending angle of the stainless steel plate is 90 degrees.
Preferably, the second die shank is perpendicular to the second body head.
Preferably, the lengths of the two side wall surfaces where the included angle of the first bending tip is located are 7.03mm and 6.45mm respectively.
Preferably, the second body tail portion comprises a third end surface and a fourth end surface, wherein the third end surface is provided with an outward convex folded angle and extends downwards to form a second folded tip with the fourth end surface.
The bevel of the third end surface is arranged on the end surface corresponding to the second main body with the tail height of 26 mm.
The utility model has the advantages that:
the utility model provides a bending forming die for stainless steel plates, wherein the upper bending die of the bending forming die is provided with two specific structures (namely a first upper die and a second upper die) which are respectively used for bending the stainless steel plates with the thickness of 2 mm-2.5 mm and 3 mm-6.5 mm; and the lower mould of bending is equipped with two kinds, is first lower mould and second lower mould respectively, and first module is through setting up the die body of multiple different length, and the user can select to use or make up the use in the face of the actual demand of the stainless steel panel of different width, perhaps directly selects the second lower mould that length is 3200mm, and is more nimble convenient in the use. If the mold body needs to be combined for use, the length can be spliced only by placing the mold body on a fixed groove of the base; in addition, the design of the included angle between the two bending tips of the upper bending die enhances the rigidity and stability of the upper bending die, optimizes the bending forming effect and improves the yield.
Drawings
Fig. 1 is a schematic view of a cross-sectional structure of a first upper die of a bending mold according to the present invention;
fig. 2 is a schematic view of a first upper die size of the bending forming die provided by the present invention;
fig. 3 is a schematic view of a second upper die cross-sectional structure of the bending mold according to the present invention;
fig. 4 is a schematic diagram of a second upper die size of the bending forming die provided by the present invention;
fig. 5 is a schematic view of a second upper die bending stainless steel plate of the bending forming die of the present invention;
fig. 6 is a schematic view of a cross-sectional structure of a first lower die set of the bending mold according to the present invention;
fig. 7 is a schematic view of a second lower die sectional structure of the bending forming die provided by the utility model.
Description of the reference numerals
1 a first upper die, 2 a second upper die, 3a first lower die set and 4 a second lower die;
11 a first die shank, 12 a first body; 111 die neck, 112 gap; 121 a first body head, 122 a first body middle, 123a first body tail, 124 a first bending tip, 123a first end face, 123b second end face, 123c first end face dog-ear;
21 a second die shank, 22 a second body; 221 a second body head, 222 a second body middle, 223a second body tail, 224 a second bent tip, 223a third end face, 223b fourth end face, 223c third end face bevel.
Detailed Description
The following describes the present invention with reference to the accompanying drawings.
As shown in fig. 1 to 7, the embodiment provides a bending forming die for a stainless steel plate, the bending forming die is installed on a bending forming machine, the bending forming machine includes a support frame and a workbench, and the support frame is arranged above the workbench; the bending forming die comprises an upper bending die and a lower bending die; the bending upper die is connected with the lower end part of the support frame, the end face, facing the support frame, of the workbench is connected with a bending lower die, and the bending upper die and the bending lower die are arranged correspondingly;
the bending upper die comprises a first upper die 1 and a second upper die 2;
the first upper die 1 is used for bending a stainless steel plate with the thickness of 2 mm-2.5 mm; the second upper die 2 is used for bending a stainless steel plate with the thickness of 3 mm-6.5 mm;
the first upper die 1 comprises a first die shank 11 and a first main body 12; the height of the first die shank 11 is 30mm, and the thickness of the first die shank is 13 mm; part of the wall surface of the first die handle 11 is inwards sunken to form a die neck 111, so that the first die handle 11 is provided with a notch 112 which is embedded and connected with the lower end part of the support frame; the height of the die neck 111 is 10.5mm, and the thickness of the die neck 111 is four fifths of that of the first die handle 11; when the mold neck is used for being connected with the supporting frame, the supporting frame clamps the mold neck, and the embedded block of the supporting frame is embedded and connected with the notch 112.
The height of the first body 12 is 149mm, and the maximum thickness is 48 mm; the first body is provided with a head part 121, a middle part 122 and a tail part 123, wherein the maximum thickness of the head part 121 is 48mm, the thickness of the middle part is 20mm, and the thickness of the tail part 122 is gradually reduced from the middle part 123 downwards; the first body tail 123 terminates with a first bent tip 124;
the end face of the first body head 121 is bent inward by 45 degrees and extends to form a connection with the first body middle part 122, the height of the part, which is not bent, of the first body head 121 is 30mm, two end faces of the first body middle part 122 are parallel, the first body tail 123 comprises a first end face and a second end face 123b of 123a, wherein an included angle between the first end face 123a and the end face of the middle part 122 connected with the first end face is 170 degrees, an included angle between the second end face 123b and the end face of the middle part 122 connected with the second end face is 158 degrees, an outward-protruding bent angle 123c is arranged at the tail end of the first end face 123a, and the tail end of the second end face 123b is bent towards the direction of the first end face 123a and is connected with the tail end of the first; the height of the tail part is 45.75 mm; the included angle of the first bent tip 124 is 84 °; in particular, the design of the break angle 123c of the first end surface can enhance the rigidity of the first bending tip.
The second upper die 2 comprises a second die shank 21 and a second main body 22; the height of the second die shank 21 is 22mm, and the thickness of the second die shank is 13 mm; the height of the second body 22 is 183mm, and the maximum thickness is 22 mm; the second body 22 has a head 221, a middle 222 and a tail 223; wherein, the maximum thickness of the head part 221 is 22mm, the height is 35mm, the thickness of the middle part 222 is 18mm, the height is 98mm, and the thickness of the tail part 223 gradually decreases from the middle part 222; the second body tail 223 has a second bent tip 224 at the end;
the head part 221 of the second main body is bent inwards by 15 degrees from the end surface with the height of 20mm and extends to form connection with the middle part 222 of the second main body; the height of the unbent part of the head part 221 of the second main body is 20mm, and the height of the bent part is 15 mm; the two end faces of the second body middle part 222 are parallel, and the included angle of the second bending tip 224 at the tail end 223 of the second body is 30 degrees;
the bending lower die comprises a first lower die set 3 and a second lower die set 4; the first lower die set 3 and the second lower die 4 are connected with the workbench through a base (not shown); the base is provided with a fixing groove for fixedly placing the first lower die set 3 or the second lower die, and the length of the fixing groove is 3200 mm;
the first lower die set 3 comprises eight die bodies with different lengths, and the lengths of the eight die bodies are respectively 50mm, 80mm, 90mm, 100mm, 150mm, 200mm, 250mm and 2280mm (marked in the figure);
the second lower die 4 comprises a die body with the length of 3200 mm; the die bodies are provided with forming grooves corresponding to the bending tips of the bending upper die.
In this embodiment, the molding groove of the mold body is a right-angle groove; the forming groove is designed as a right-angle groove, so that the bending angle of the stainless steel plate is 90 degrees. The second die shank 21 is perpendicular to the second body head 221.
The lengths of two side wall surfaces where the included angle of the first bending tip 124 is located are 7.03mm and 6.45mm respectively. The second body tail portion 223 includes a third end surface 223a and a fourth end surface 223b, wherein the third end surface 223a is provided with a convex folded corner 223c and extends downward to form a second folded tip 224 with the fourth end surface 223 b. The bevel 223c of the third end surface is arranged at the end surface corresponding to the second body tail 223 with the height of 26 mm.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (7)

1. A bending forming die for stainless steel plates is mounted on a bending forming machine, the bending forming machine comprises a support frame and a workbench, and the support frame is arranged above the workbench; the bending forming die comprises an upper bending die and a lower bending die; the bending upper die is connected with the lower end part of the support frame, the end face, facing the support frame, of the workbench is connected with a bending lower die, and the bending upper die and the bending lower die are arranged correspondingly; the method is characterized in that:
the bending upper die comprises a first upper die and a second upper die;
the first upper die is used for bending a stainless steel plate with the thickness of 2 mm-2.5 mm;
the second upper die is used for bending a stainless steel plate with the thickness of 3 mm-6.5 mm;
the first upper die comprises a first die shank and a first main body; the height of the first die shank is 30mm, and the thickness of the first die shank is 13 mm; the wall surface of the first die handle part is inwards sunken to form a die neck, so that the first die handle is provided with a notch which is embedded and connected with the lower end part of the support frame; the height of the die neck is 10.5 mm;
the height of the first body is 149mm, and the thickness of the first body is less than or equal to 48 mm; the first main body is provided with a head part, a middle part and a tail part, the thickness of the head part is 48mm, the thickness of the middle part is 20mm, and the thickness of the tail part is gradually reduced from the middle part downwards; the tail end of the first main body is provided with a first bending tip;
the end face of the head of the first main body is inwards bent by 45 degrees and extends to the middle of the first main body to form connection, the height of the part, which is not bent, of the head of the first main body is 30mm, two end faces of the middle of the first main body are parallel, the tail of the first main body comprises a first end face and a second end face, an included angle formed by the first end face and the connected middle end face of the first main body is 170 degrees, an included angle formed by the second end face and the connected middle end face of the second end face of the first main body is 158 degrees, the tail end of the first end face is provided with an outward-protruding bent angle, and the tail end of the second end face is bent towards the direction; the height of the tail part is 45.75 mm; the included angle of the first bending tip is 84 degrees;
the second upper die comprises a second die shank and a second main body; the height of the second die shank is 22mm, and the thickness of the second die shank is 13 mm; the height of the second main body is 183mm, and the thickness of the second main body is less than or equal to 22 mm; the second body has a head, a middle, and a tail; wherein, the thickness of the head part is 22mm, the height thereof is 35mm, the thickness of the middle part is 18mm, the height thereof is 98mm, and the thickness of the tail part thereof is gradually reduced from the middle part downwards; the tail end of the second main body is provided with a second bent tip;
the head of the second main body is bent inwards by 15 degrees from the end face with the height of 20mm and extends to the middle of the second main body to form connection; the height of the part of the head of the second main body, which is not bent, is 20mm, and the height of the bent part is 15 mm; the two end faces of the middle part of the second main body are parallel, and the included angle of a second bent tip at the tail end of the second main body is 30 degrees;
the bending lower die comprises a first lower die set and a second lower die; the first lower die set and the second lower die are connected with the workbench through the base; the base is provided with a fixing groove for fixedly placing the first lower die set or the second lower die, and the length of the fixing groove is 3200 mm;
the first lower die set comprises eight die bodies with different lengths, and the lengths of the eight die bodies are respectively 50mm, 80mm, 90mm, 100mm, 150mm, 200mm, 250mm and 2280 mm;
the second lower die comprises a die body with the length of 3200 mm;
the die bodies are provided with forming grooves corresponding to the bending tips of the bending upper die.
2. The bend forming die of claim 1, wherein the forming grooves of the die body are right angle grooves.
3. The bend-forming die of claim 1, wherein the second die shank is perpendicular to the second body head.
4. The bend forming die of claim 1, wherein the lengths of the two side wall surfaces of the first bending tip included angle are 7.03mm and 6.45mm respectively.
5. The bend-forming die of claim 1, wherein the second body tail portion includes a third end surface and a fourth end surface, wherein the third end surface defines a convex bend angle and extends downwardly to form a second bend point with the fourth end surface.
6. The bending mold according to claim 5, wherein the bevel of the third end surface is provided at the end surface corresponding to the second body tail portion with a height of 26 mm.
7. The bend-forming die of claim 1, wherein the die neck thickness is four-fifths of the thickness of the first die shank.
CN201922262790.1U 2019-12-13 2019-12-13 Bending forming die for stainless steel plate Active CN211247992U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922262790.1U CN211247992U (en) 2019-12-13 2019-12-13 Bending forming die for stainless steel plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922262790.1U CN211247992U (en) 2019-12-13 2019-12-13 Bending forming die for stainless steel plate

Publications (1)

Publication Number Publication Date
CN211247992U true CN211247992U (en) 2020-08-14

Family

ID=71967453

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201922262790.1U Active CN211247992U (en) 2019-12-13 2019-12-13 Bending forming die for stainless steel plate

Country Status (1)

Country Link
CN (1) CN211247992U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114130865A (en) * 2021-11-25 2022-03-04 江苏博林机械制造有限公司 Combined mould

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114130865A (en) * 2021-11-25 2022-03-04 江苏博林机械制造有限公司 Combined mould

Similar Documents

Publication Publication Date Title
CN102784843B (en) 90-degree bent stamping part mold and forming process thereof
JP2012192421A (en) Bending method of metal plate, machining tool used therefor, bent article formed by bending method and intermediate bent article
CN107427884B (en) Impact forming method and punch-forming mold
CN211247992U (en) Bending forming die for stainless steel plate
CN104998934A (en) Machining method of nine-bending workpiece
CN105728559A (en) One-die two-socket precise forming die
KR101744799B1 (en) Hydroforming apparatus for tube
CN212384384U (en) Bending, rounding and stamping progressive die for parts with multi-layer drum-shaped structures
CN211803242U (en) Arc-shaped structure folding tool and arc-shaped side plate thereof
CN103861902A (en) U-shaped metal plate manufacturing method
CN104209407A (en) Automotive chassis stamping die
CN110918725A (en) Bending process for ordinary bending multi-angle short bending distance
CN102672051A (en) Die for bending switch butterfly elastic piece
CN202411233U (en) Metal plate forming bending machine mold
CN103084440A (en) Application of mirco-connection in metal plate arc bending
JP6159108B2 (en) Bending mold
CN212042300U (en) Slotting and bending die
JP3147993U (en) Press bending die
CN216297705U (en) Hoop part forming tool
CN111872194A (en) Forming method and machining device for arc-shaped asymmetric part
CN211247975U (en) Aluminum profile bending die
CN211866247U (en) Section bar self-control bending device
JP5314383B2 (en) Mold for press bending machine
CN205732563U (en) A kind of industry diel
CN108405721A (en) A kind of coiling mould

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant