CN114309330A - Integrative stamping forming equipment of metal staple bolt batched - Google Patents
Integrative stamping forming equipment of metal staple bolt batched Download PDFInfo
- Publication number
- CN114309330A CN114309330A CN202111570707.2A CN202111570707A CN114309330A CN 114309330 A CN114309330 A CN 114309330A CN 202111570707 A CN202111570707 A CN 202111570707A CN 114309330 A CN114309330 A CN 114309330A
- Authority
- CN
- China
- Prior art keywords
- blanking
- plate
- bending
- upper die
- core
- 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.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims abstract description 50
- 238000005452 bending Methods 0.000 claims abstract description 79
- 230000007246 mechanism Effects 0.000 claims abstract description 30
- 238000005520 cutting process Methods 0.000 claims abstract description 23
- 238000004080 punching Methods 0.000 claims abstract description 15
- 238000007723 die pressing method Methods 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 239000011265 semifinished product Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
- Press Drives And Press Lines (AREA)
Abstract
The invention discloses a metal hoop batch integrated punch forming device, which comprises a die frame, a blanking mechanism and a bending mechanism, wherein the die frame is provided with a die head and a die head; the blanking mechanism comprises a blanking upper die core and a blanking needle which are arranged on the upper die plate, and a blanking lower die core plate which is arranged on the lower die plate and matched with the upper die core and the blanking needle, wherein a gap is reserved in the relative middle of the blanking upper die core; the bending mechanism comprises an upper bending mold core and a cutting punch which are arranged on the upper template, and a lower bending mold core and a lower cutting mold core which are arranged on the lower template. The punching and forming operation of the metal hoop is divided into two working procedures of punching and bending, the forming dies of the two working procedures are arranged in the same feeding direction, the punching working procedure and the bending working procedure can be completed only by one-time punching stroke, the production efficiency is high, and the metal hoop is suitable for mass production.
Description
Technical Field
The invention relates to the technical field of hardware fitting forming, in particular to a metal hoop batch integrated punch forming device.
Background
The metal hoop is widely applied to installation and fixation of an electrical equipment pipeline as the most common hardware fitting in industrial production, generally comprises a metal hoop plate, a bolt and a gasket, wherein the metal hoop plate is in an arc shape, is attached to the outer surface of the pipeline, is provided with two fixing lugs with holes and is used for fastening a bolt pair.
The hoop plate of the metal hoop is usually formed by stamping a metal plate, and the metal hoop stamping equipment at the present stage usually has the following problems: (1) the method is lack of integrated molding equipment, can be completed by a plurality of molds or a plurality of sets of equipment, and has low production efficiency; (2) the demoulding efficiency is low, and a continuous production beat is difficult to form; (3) the blanking and bending precision is poor, and the material waste is serious.
Disclosure of Invention
The invention aims to provide a metal hoop batch integrated punch forming device to solve the technical problems in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme: a metal hoop batch integrated punch forming device comprises a die frame, a blanking mechanism and a bending mechanism, wherein the blanking mechanism and the bending mechanism are sequentially arranged on the die frame along a feeding direction;
the die frame comprises an upper die plate and a lower die plate;
the blanking mechanism comprises a blanking upper die core and a blanking needle which are arranged on the upper die plate, and a blanking lower die core plate which is arranged on the lower die plate and matched with the upper die core and the blanking needle, wherein a gap is reserved in the middle of the blanking upper die core, so that a connecting part is reserved between the bent base plate and a rear raw metal plate after blanking;
the bending mechanism comprises a bending upper mold core and a cutting punch which are arranged on the upper template, and a bending lower mold core and a cutting lower mold core which are arranged on the lower template; the bending upper mold core is matched with the bending lower mold core; and the cutting punch is matched with the lower cutting die core and used for cutting off the connecting part.
Preferably, the upper template and the lower template are respectively provided with a guide sleeve and a guide post which are matched with each other; the top of the upper template is provided with a template handle, and the template handle is connected with a driving device.
Preferably, guide plates are respectively arranged on the two sides of the raw material metal plate on the blanking lower die core plate, and the distance between the two guide plates is matched with the width of the raw material metal plate, so that the guide and alignment effects are achieved.
Preferably, the guide plate is provided with a relatively narrow part in front of the blanking area, and a side rib is formed between the relatively narrow part and the blanking area; the width of the relative narrow part is matched with the width of the bent base plate after blanking is finished, and the feeding length between two blanking actions can be controlled.
Preferably, the blanking mechanism further comprises a blanking upper die pressing plate arranged on the upper die plate through a blanking pressing spring and used for fixing feeding during blanking.
Preferably, the blanking upper die core and the punching needle pass through the blanking upper die pressing plate and can slide relative to the blanking upper die pressing plate.
Preferably, the bending mechanism further comprises a bending upper die pressing plate arranged on the upper die plate through a bending pressing spring and used for fixing feeding during bending.
Preferably, an inner sliding groove is formed in the bending upper die core, and the bending upper die pressing plate is arranged in the inner sliding groove in a relatively sliding manner.
Preferably, the cutting punch is disposed in close contact with a side surface of the bent upper core.
Preferably, the highest point of the arc surface of the bending lower die core is flush with the surface of the blanking lower die core plate.
In the present invention, "front" means a direction directed in the feeding direction.
Compared with the prior art, the invention has the advantages that:
(1) the punching and forming operation of the metal hoop is divided into two working procedures of punching and bending, the forming dies of the two working procedures are arranged in the same feeding direction, the punching working procedure and the bending working procedure can be completed only by one-time punching stroke, the production efficiency is high, and the metal hoop is suitable for mass production.
(2) According to the invention, the side surface of the guide plate of the area to be blanked is limited by the raw material metal sheet in the horizontal direction, so that the feeding length between two blanking actions can be controlled, the structure is simple, and the efficiency is high.
(3) In the invention, semi-finished products in different procedures are connected with each other, and the feeding actions of a plurality of procedures can be completed only by one set of feeding mechanism in the horizontal direction.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a right side sectional view of the present invention.
Fig. 3 is a schematic structural view of the blanking mechanism of the present invention.
Fig. 4 is a schematic structural view of the bending mechanism of the present invention.
FIG. 5 is a schematic top view of the feed process of the present invention.
FIG. 6 is a schematic structural view of an upper mold plate according to the present invention.
FIG. 7 is a schematic structural view of the lower template of the present invention.
In the figure: 1. a die shank; 2. mounting a template; 3. a metal plate (301, a raw material metal plate; 302, a bent base plate; 303, a bent semi-finished product; 304, a workpiece finished product); 4. a guide sleeve; 5. a guide post; 6. a lower template; 7. a lower die fixing plate; 8. bending the lower mold core; 9. bending the upper mold core; 10. a guide plate; 11. blanking a material pressing spring; 12. blanking an upper mold core; 13. blanking an upper die pressing plate; 14. blanking a lower die core plate; 15. blanking the upper die fixing plate; 16. punching a needle; 17. bending the material pressing spring; 18. bending the upper die fixing plate; 19. cutting off the punch and 20, and bending the upper die pressing plate; 21. and cutting off the lower mold core.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further specifically described below by way of embodiments in combination with the accompanying drawings.
Example (b): a metal hoop batch integrated punch forming device is shown in figures 1-7 and comprises a die frame, and a blanking mechanism and a bending mechanism which are sequentially arranged on the die frame along a feeding direction.
The die carrier consists of an upper die plate 2, a lower die plate 6, a die shank 1, a guide pillar 5 and a guide sleeve 4; the upper die and the lower die of the blanking mechanism and the bending mechanism are respectively fixed on the upper template 2 and the lower template 6; the upper template 2 is provided with a guide sleeve 4, one end of a guide pillar 5 is fixed on the lower template 6, the other end of the guide pillar 5 and the guide sleeve 4 form a sliding pair, and the two groups of guide pillars 5 and the guide sleeve 4 are symmetrically arranged along the central axis. One end of the die shank 1 is fixed on the upper die plate 2, and the other end is connected with a hydraulic cylinder (not shown in the figure).
The blanking mechanism comprises a blanking upper die fixing plate 15, a blanking upper die pressing plate 13, a blanking upper die core 12, a punching needle 16, a blanking pressing spring 11, a guide plate 10 and a blanking lower die core plate 14; the blanking upper die fixing plate 15 is fixed on the upper die plate 2, one set of blanking mechanism comprises two guide plates 10 which are arranged in a mirror symmetry mode, two blanking needles 16 and four blanking pressing springs 11, the blanking upper die core 12 is divided into two parts which are arranged in a mirror symmetry mode, a gap is reserved in the middle of the two parts, each part is in an L shape, the size of a bent base plate 302 can be blanked, and a connecting part is reserved between the blanked bent base plate 302 and a rear raw material metal plate 301; the punching pins 16 are respectively bent at two ends of the base plate 302 for punching holes on fixing lugs at two ends of the metal hoop plate. One end of the blanking upper die core 12 and one end of the punch pin 16 are fixed on the blanking upper die fixing plate 15, and the other end of the blanking upper die core passes through the blanking upper die pressure plate 13 to form a single-degree-of-freedom sliding pair; the blanking upper die fixing plate 15 and the blanking upper die pressing plate 13 are provided with four symmetrically arranged blanking pressing springs 11, and the blanking upper die pressing plate 13 is pushed by force generated when the springs are compressed to fix the raw material metal plate 301. Blanking lower mould core plate 14 is fixed in lower mould fixed plate 7 on lower bolster 6, and deflector 10 is fixed in blanking lower mould core plate 14 through the bolt pair, and the distance between two deflectors 10 is equivalent with raw materials metal sheet 301's width, plays the effect of aliging, the feeding of the raw materials metal sheet 301 of being convenient for. The guide plate 10 is provided with a relatively narrow portion in front of the blanking region, a side flange is formed between the relatively narrow portion and the blanking region, the width of the relatively narrow portion is matched with the width of the bent base plate 302 after blanking, so that the guide plate plays a role of limiting, and the feeding length between two blanking actions can be controlled.
The bending mechanism comprises an upper bending die fixing plate 18, an upper bending die core 9, an upper bending die pressing plate 20, a lower bending die core 8, a cutting punch 19, a lower cutting die core 21 and a bending pressing spring 17. The bending upper die fixing plate 18 is fixed on the lower die plate 6, and the bending upper die core 9 is fixed on the bending upper die fixing plate 18 through a bolt pair; one end of a cutting punch 19 is fixed on the bending upper die fixing plate 18, and the side surface of the cutting punch is tightly attached to the bending upper die pressing plate 20; the bending upper die pressing plate 20 is arranged in a chute in the bending upper die core 9 and forms a sliding pair with the chute of the bending upper die core 9; one end of the bending material pressing spring 17 is fixed to the upper die plate 2, the other end of the bending material pressing spring is fixed to the bending upper die material pressing plate 20, and the bending upper die material pressing plate 20 is pushed by force generated when the spring is compressed to fix the bending base plate material 302. The bending lower mold core 8 is fixed on the lower mold fixing plate 7; the cutting lower mold core 21 is fixed in the square hole of the bending lower mold core 8. The highest point of the arc surface of the bending lower mold core 8 is flush with the surface of the blanking lower mold core plate 14, so that the blanked bending base plate 302 can smoothly enter the bending area.
The working process of the integrated metal hoop batch stamping and forming equipment in the embodiment is as follows:
as shown in fig. 5, in the initial state, the raw metal plate 301 is inserted in close contact with the lower die core plate 14 in the horizontal direction, and the side flanges of the pair of guide plates 10 arranged in mirror symmetry serve to align and fix the metal sheet. As shown in fig. 3, when the machine starts to work, the hydraulic cylinder drives the upper die plate 2 to vertically move downwards along the guide post 5, the blanking upper die fixing plate 15 firstly contacts and compresses the metal plate 301, meanwhile, the four blanking pressing springs 11 start to compress, the punching needle 16 and the blanking upper die core 12 continue to move downwards, the raw material metal sheet 301 is blanked and punched, a bent base plate 302 is obtained, after blanking, the hydraulic cylinder resets to drive the upper die plate 2 to move upwards for resetting, and blanking is finished.
Then, the raw material metal sheet 301 is continuously conveyed forward until the to-be-blanked area of the metal sheet is attached to the side flange of the guide plate 10 to complete the limiting, at this time, the feeding distance is the width of one metal hoop along the feeding direction, and the bent base plate 302 which is blanked last enters the bending area. The hydraulic cylinder is started again and moves downwards to drive the bending upper die pressing plate 20 to press the bending base plate 302, meanwhile, the bending pressing spring 17 is compressed, the bending upper die core 9 continues to move downwards, the bending base plate 302 is enabled to complete bending operation under the extrusion effect of the bending upper die core 9 and the bending lower die core 8, and the bending semi-finished product 303 is obtained. And simultaneously, cutting off the connecting strip between the finished product 304 and the bent semi-finished product 303 obtained in the previous bending process by using the cutting punch 19, and completing demoulding to obtain the finished metal hoop product 304.
The steps only illustrate the forming process of one hoop, and in the actual continuous working process, one-time die closing action of the die carrier can simultaneously carry out blanking and bending processes, so that the production efficiency is improved.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A metal hoop batch integrated punch forming device is characterized by comprising a die frame, a blanking mechanism and a bending mechanism, wherein the blanking mechanism and the bending mechanism are sequentially arranged on the die frame along a feeding direction;
the die frame comprises an upper die plate and a lower die plate;
the blanking mechanism comprises a blanking upper die core and a blanking needle which are arranged on the upper die plate, and a blanking lower die core plate which is arranged on the lower die plate and matched with the upper die core and the blanking needle, wherein a gap is reserved in the middle of the blanking upper die core, so that a connecting part is reserved between the bent base plate and a rear raw metal plate after blanking;
the bending mechanism comprises a bending upper mold core and a cutting punch which are arranged on the upper template, and a bending lower mold core and a cutting lower mold core which are arranged on the lower template; the bending upper mold core is matched with the bending lower mold core; and the cutting punch is matched with the lower cutting die core and used for cutting off the connecting part.
2. The metal hoop batch integrated punch forming equipment as claimed in claim 1, wherein the upper template and the lower template are respectively provided with a guide sleeve and a guide pillar which are matched with each other; the top of the upper template is provided with a template handle, and the template handle is connected with a driving device.
3. The metal hoop batch integrated punch forming equipment as claimed in claim 1, wherein guide plates are respectively arranged on two sides of the raw material metal plate on the blanking lower die core plate, and the distance between the two guide plates is matched with the width of the raw material metal plate.
4. The metal anchor ear batch integrated punch forming device as claimed in claim 3, wherein the guide plate is provided with a relatively narrow portion in front of the blanking region, and a side rib is formed between the relatively narrow portion and the blanking region; the width of the relative narrow part is matched with the width of the bent base plate after blanking.
5. The metal hoop batch integrated punch forming equipment as claimed in claim 1, wherein the blanking mechanism further comprises a blanking upper die pressing plate disposed on the upper die plate through a blanking pressing spring.
6. The metal hoop batch integrated punch forming equipment as claimed in claim 5, wherein the blanking upper die core and the punching needle pass through the blanking upper die pressing plate and can slide relative to the blanking upper die pressing plate.
7. The metal hoop batch integrated punch forming equipment as claimed in claim 1, wherein the bending mechanism further comprises a bending upper die pressing plate arranged on the upper die plate through a bending pressing spring.
8. The metal hoop batch integrated punch forming equipment as claimed in claim 7, wherein an inner sliding groove is formed in the bending upper die core, and the bending upper die pressing plate is arranged in the inner sliding groove in a relatively sliding manner.
9. The metal hoop batch integrated punch forming equipment as claimed in claim 1, wherein the cutting punch is closely attached to the side face of the bent upper die core.
10. The metal hoop batch integrated punch forming equipment as claimed in claim 1, wherein the highest point of the arc surface of the bent lower die core is flush with the surface of the blanking lower die core plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111570707.2A CN114309330A (en) | 2021-12-21 | 2021-12-21 | Integrative stamping forming equipment of metal staple bolt batched |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111570707.2A CN114309330A (en) | 2021-12-21 | 2021-12-21 | Integrative stamping forming equipment of metal staple bolt batched |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114309330A true CN114309330A (en) | 2022-04-12 |
Family
ID=81053911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111570707.2A Pending CN114309330A (en) | 2021-12-21 | 2021-12-21 | Integrative stamping forming equipment of metal staple bolt batched |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114309330A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115415749A (en) * | 2022-09-21 | 2022-12-02 | 成都飞机工业（集团）有限责任公司 | Hoop punching processing method |
| CN116978879A (en) * | 2023-08-14 | 2023-10-31 | 深圳市锐骏半导体股份有限公司 | Metal connecting sheet with buffer function and stamping equipment thereof |
| CN116978879B (en) * | 2023-08-14 | 2024-06-07 | 深圳市锐骏半导体股份有限公司 | Metal connecting sheet with buffer function and stamping equipment thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5067336A (en) * | 1988-12-30 | 1991-11-26 | Isoform | Device for pressing sheet material |
| JP2000024716A (en) * | 1998-07-08 | 2000-01-25 | Amada Co Ltd | Bending die set and punch press provided with bending die set |
| KR101737743B1 (en) * | 2016-12-21 | 2017-05-29 | 김형중 | The plane washer production device which is available the bur remaval |
| CN206854456U (en) * | 2017-06-20 | 2018-01-09 | 江西江铃底盘股份有限公司 | A kind of guide bearing catch progressive die |
| CN208131762U (en) * | 2018-04-09 | 2018-11-23 | 深圳市宏拓伟业精密五金制品有限公司 | Efficient press machine |
| CN208879475U (en) * | 2018-09-04 | 2019-05-21 | 东莞市申德机械配件有限公司 | A kind of punching press for processing sheet metal component, Bending Mould |
| CN211707878U (en) * | 2019-12-30 | 2020-10-20 | 上海德真工贸有限公司 | Support staple bolt stiff end piece that falls upgrades mould |
| CN216757937U (en) * | 2021-12-21 | 2022-06-17 | 杭州电力设备制造有限公司临安恒信成套电气制造分公司 | Integrative stamping forming equipment of metal staple bolt batched |
-
2021
- 2021-12-21 CN CN202111570707.2A patent/CN114309330A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5067336A (en) * | 1988-12-30 | 1991-11-26 | Isoform | Device for pressing sheet material |
| JP2000024716A (en) * | 1998-07-08 | 2000-01-25 | Amada Co Ltd | Bending die set and punch press provided with bending die set |
| KR101737743B1 (en) * | 2016-12-21 | 2017-05-29 | 김형중 | The plane washer production device which is available the bur remaval |
| CN206854456U (en) * | 2017-06-20 | 2018-01-09 | 江西江铃底盘股份有限公司 | A kind of guide bearing catch progressive die |
| CN208131762U (en) * | 2018-04-09 | 2018-11-23 | 深圳市宏拓伟业精密五金制品有限公司 | Efficient press machine |
| CN208879475U (en) * | 2018-09-04 | 2019-05-21 | 东莞市申德机械配件有限公司 | A kind of punching press for processing sheet metal component, Bending Mould |
| CN211707878U (en) * | 2019-12-30 | 2020-10-20 | 上海德真工贸有限公司 | Support staple bolt stiff end piece that falls upgrades mould |
| CN216757937U (en) * | 2021-12-21 | 2022-06-17 | 杭州电力设备制造有限公司临安恒信成套电气制造分公司 | Integrative stamping forming equipment of metal staple bolt batched |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115415749A (en) * | 2022-09-21 | 2022-12-02 | 成都飞机工业（集团）有限责任公司 | Hoop punching processing method |
| CN116978879A (en) * | 2023-08-14 | 2023-10-31 | 深圳市锐骏半导体股份有限公司 | Metal connecting sheet with buffer function and stamping equipment thereof |
| CN116978879B (en) * | 2023-08-14 | 2024-06-07 | 深圳市锐骏半导体股份有限公司 | Metal connecting sheet with buffer function and stamping equipment thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206882509U (en) | A kind of diel of piece terminal | |
| CN110711839A (en) | Multi-station stamping progressive die for automatic production of bent chain plates | |
| CN202239210U (en) | Steel backing composite dropping belt table device | |
| CN216757937U (en) | Integrative stamping forming equipment of metal staple bolt batched | |
| CN114309330A (en) | Integrative stamping forming equipment of metal staple bolt batched | |
| CN111014451B (en) | Progressive stamping die of radiator support | |
| CN218361628U (en) | Blanking and stretching composite die | |
| CN213440063U (en) | Mechanism punches a hole to inside outside | |
| CN211437741U (en) | Crossbeam continuous blanking die | |
| CN214133585U (en) | Automatic forming stamping die for elastic sheet on quick-release lock part | |
| KR102078599B1 (en) | Washer manufacturing equipment | |
| CN209349454U (en) | A kind of dedicated forging equipment of high-speed railway track switch iron seat | |
| CN213701432U (en) | Progressive die belt continuous stamping die with self-made wedge structure | |
| CN219561063U (en) | Stamping die of safety in production | |
| CN210059512U (en) | Stamping forming quick-change type tooth-drawing mechanism | |
| CN216027500U (en) | Double-end nut plate stamping and drawing die | |
| CN219483939U (en) | Continuous mould for forming terminal material with puncture and bending | |
| CN110695173A (en) | Copper pipe stamping forming device | |
| CN217223226U (en) | Novel in-mold riveting structure | |
| CN217617311U (en) | Mold mechanism for manufacturing wave-shaped chain type socket terminal | |
| CN213162899U (en) | Stamping type forging die for metal workpiece | |
| CN216989399U (en) | Stamping equipment for post-cast strip supporting baffle | |
| CN219093351U (en) | Stamping die for precise panel bracket | |
| CN218574758U (en) | Stamping die with synchronous side punching and hole flanging | |
| CN213826691U (en) | U-shaped bending stamping forming die for plates |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |