CN103206444B - Preforming device of U-shaped bolt - Google Patents
Preforming device of U-shaped bolt Download PDFInfo
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- CN103206444B CN103206444B CN201310083313.3A CN201310083313A CN103206444B CN 103206444 B CN103206444 B CN 103206444B CN 201310083313 A CN201310083313 A CN 201310083313A CN 103206444 B CN103206444 B CN 103206444B
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Abstract
The invention discloses a preforming device of a U-shaped bolt. The U-shaped bolt comprises a flat part. The performing device of the U-shaped bolt comprises an oil press, a die set, and bar stocks to be processed, wherein the bar stocks are arranged in the die set, and the die set includes an upper template and a lower template; an upper die set and a lower die set arranged between the upper template and the lower template and in the middle of the bar stocks; a clamping device arranged between the upper template and the lower template and at both sides of the bar stocks; and an elastic force device acting on the two ends of the bar stocks. The clamping device includes an upper pressing block, a lower support base and a housing cavity at both sides of the bar stocks formed by folding opposite surfaces of the upper pressing block and the lower support base. The lower support base is fixed above the lower template. The upper pressing block is movably connected to the upper template. A spring cavity is arranged on the upper pressing block. An elastic body is arranged in the spring cavity. One end of the elastic body is arranged at the bottom of the spring cavity and can stretch and deform in the vertical direction. The performing device of the U-shaped bolt can effectively prevent looseness in bolt connection.
Description
Technical field
The present invention relates to fastening connection piece technical field, more particularly, it relates to a kind of pre-forming device of U bolt.
Background technique
U bolt is generally used for Motor Vehicle fastening connection piece, and usually adopt round steel material, be provided with externally threaded screw section at the two end part of bolt, screw section coordinates with specialized nut, thus realizes being fastenedly connected of different parts.At present, the screw section of U bolt and the cross section unification in non-threaded portion are for circular, and the way of contact of this kind of U bolt and link is linear contact lay, and area of contact is little, the situation that normal appearance connection is not tight.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of pre-forming device of the U bolt larger with link area of contact, thus improve U bolt connective stability.
The technological scheme that the present invention solves its technical problem is: a kind of pre-forming device of U bolt, U bolt comprises both sides right cylinder section parallel to each other, connect the curved segment of two right cylinder sections, described right cylinder section is provided with screw section, the outer wall of screw section is provided with outside thread, described curved segment comprises the plat part being positioned at middle part, connect the transition arcs portion of plat part and both sides right cylinder section, the pre-forming device of U bolt comprises oil hydraulic press and casted die mould, bar to be processed, described casted die mould is placed on the working platform of oil hydraulic press, described bar is placed in casted die mould, described casted die mould comprises upper die plate and lower plate, be arranged between bolster and the upper press-moulding die be positioned in the middle part of bar and press down pattern, be arranged between bolster and be positioned at the holding device of bar both sides, act on the elastic force apparatus in bar both ends of the surface, described holding device comprises binder block, lower bearing support, the holding cavity forming bar both sides is closed up by the opposing side of described upper binder block, lower bearing support, described lower bearing support is fixed on above lower plate, described upper binder block is flexibly connected with upper die plate, described upper binder block is provided with spring chamber, be provided with elastomer in described spring chamber, a described elastomeric end face be placed in spring chamber bottom surface and can dilatation in vertical direction.
The cross section of described plat part is rectangle.
Described plat part is arc-shaped steel section.
Described plat part is after adopting cold-press process to be flattened by bar by 2000t oil hydraulic press, then bends shaping.
The radian of described plat part is between 100 °-180 °.
The invention has the beneficial effects as follows: by flattening process to local, non-threaded portion, the contact of U bolt and connected element changes into plane-plane contact from linear contact lay, the planeness of its partial circle segmental arc reaches designing requirement, can with central siphon good contact, area of contact reaches more than 95%.Add the area of contact of U bolt and link, effectively prevent from connecting not tight situation.
The bolt hardness of the same type that current common process is made is HB220---250, and U bolt of the present invention is by cold moudling, the U bolt of the 40Cr material made, and its hardness reaches HB310---and 330.Bolt grade is 4.9 grades.
U bolt outward appearance of the present invention is good, without the coarse phenomenon of peeling.
Production domesticization produced by U bolt of the present invention, and product cost is significantly reduced, and single products can decline 17 U.S. dollars, for enterprise brings very big economic benefit.
Accompanying drawing explanation
Fig. 1 is U bolt structural front view of the present invention.
Fig. 2 is U bolt stereogram of the present invention.
Fig. 3 is U bolt pre-forming device structural representation of the present invention.
Fig. 4 is U bolt curving apparatus structural representation of the present invention.
Embodiment
The U bolt be connected with suspension for semitrailer car axletree is below example, is described in further detail by reference to the accompanying drawings with embodiment to the present invention.
As shown in Figure 1 and Figure 2, U bolt of the present invention is by bar 6 machine shaping, comprise both sides right cylinder section 31 parallel to each other, connect the curved segment of two right cylinder sections, described right cylinder section is provided with screw section 33, the outer wall of screw section is provided with outside thread, and described curved segment comprises the plat part 32 being positioned at middle part, the transition arcs portion connecting plat part and both sides right cylinder section.
The cross section of described plat part 32 is rectangle.
Described plat part 32 for diameter be the arc-shaped steel section of R.
Described plat part 32 is after adopting cold-press process to be flattened by bar by 2000t oil hydraulic press, then bends shaping.
The radian of described plat part 32 is between 100-180 DEG C.
The processing technology of U bolt of the present invention is such:
Be the rod iron of 25cm by diameter, cylindrical turning to diameter is 21cm, and---the both sides rolled thread of round steel bar---is placed in pre-shaping in pre-forming device of the present invention, the middle part of bar is made to be pressed into flat pattern---bend, and certain U-shaped opening surplus (7mm)---quenching with Subsequent tempering---correction is set.Pre-forming device of the present invention makes preformed U bolt have the arcuate segment of a surfacing, and at this arcuate segment, bolt and axletree axis body plane-plane contact, change the mode of line face contact in the past, and make both contacts more abundant, attachment force is stronger.The present invention adopts 2000T oil hydraulic press (as calculated, for realizing high-precision bar molding effect, at least needing the oil hydraulic press cold moudling of more than 1500T).
When bar is first placed in pre-forming device, bar both sides are clamped by upper binder block, lower bearing support, and both ends of the surface then compressed by compression leg and stage clip, and its vertical center line is overlapped with the center line of upper and lower press-moulding die.The both sides, lower end of upper press-moulding die are chamfered transition, the lug boss of press-moulding die lower end in formation, this lug boss positive alignment middle part of metal bar to be processed, need just to flatten shaping region.When bar is just placed in casted die mould, the middle part of bar is identical with both sides diameter, therefore, bar is upper press-moulding die, lift certain altitude together with punch pad, upper die plate, after oil hydraulic press starts, along with oil hydraulic press presses down past for upper die plate, upper mould fixed plate and upper binder block spacing more and more less, until press together, now, pressing process terminates, and the middle part of bar is also processed as flat pattern under strong pressure, thus forms the transition arcs portion of plat part, connection plat part and both sides right cylinder section.And in flattening process, bar can be long by pressure, arranging elastic force apparatus at bar two ends can make the long amount of deformation of bar two side pressure be consistent, and flat area is remained on medium position.
The pre-forming device of bar 6 is see Fig. 3, U bolt pre-forming device, comprise oil hydraulic press (not shown) and casted die mould, bar 6 to be processed, described casted die mould is placed on the working platform of oil hydraulic press, described bar 6 is placed in casted die mould, and described casted die mould comprises upper die plate 8 and lower plate 1; Be arranged between bolster 1 and the upper press-moulding die 10 be positioned in the middle part of bar 6 and press down pattern 13; Be arranged between bolster 1 and be positioned at the holding device of bar 6 both sides; Act on the elastic force apparatus in bar 6 both ends of the surface.
Described holding device comprises binder block 11, lower bearing support 4, the holding cavity forming bar 6 both sides is closed up by the opposing side of described upper binder block 11, lower bearing support 4, described lower bearing support 4 is fixed on above lower plate 1, described upper binder block 11 is flexibly connected with upper die plate 8, described upper binder block 11 is provided with spring chamber, be provided with elastomer in described spring chamber, a described elastomeric end face be placed in spring chamber bottom surface and can dilatation in vertical direction.
Described elastic force apparatus comprises location key seat 3, stage clip, compression leg, described location key seat 3 is fixed on lower bearing support 4, described stage clip is built in location key seat 3 and one end is pressed on the pressing plate 12 of location key seat 3, the other end is pressed on compression leg 14, and described compression leg 14 is pressed in the both ends of the surface of bar 6 respectively.
Punch pad 7 is provided with, at described lower plate 1 and press down between pattern 13 and be provided with lower bolster 2 between described upper die plate 8 and upper press-moulding die 10.
Between punch pad 7 and upper binder block 11, be also provided with upper mould fixed plate 17, between lower bolster 2 and lower bearing support 4, be also provided with counterdie fixed plate 16.
Described upper mould fixed plate 17 is provided with the through hole suitable with the spring chamber in described upper binder block 11, and described elastomeric one end is passed described through hole and is pressed on the bottom surface of punch pad 7.
Also comprise caging bolt 9, described upper die plate 8, through described upper die plate 8, punch pad 7, upper mould fixed plate, is flexibly connected with upper binder block 11 by described caging bolt 9.
Described caging bolt 9 is separately positioned on elastomeric both sides.
Described elastomer is the spring 5 of steel.
Blank after press flat forming is placed in bend on forming equipment again and bends shaping.Thus obtain U bolt of the present invention.
See Fig. 4, U bolt curving apparatus of the present invention, comprises bending mould and press machine, described press machine adopts the oil hydraulic press of more than 1500t, and wherein, bending mould comprises punch, die 22, described die 22 is fixed on quiet die holder 27, and punch is arranged on dynamic model seat 1.Dynamic model seat 21 is driven by press machine.Also comprise support chamber, the die 22 that described support chamber runs through whole dynamic model seat 27 and arranges on it, direct reach bar 6.Be provided with push rod 25 in support chamber, push rod 25 connects nitrogen spring device.
Be provided with multiple locating stud 29 on the top of the bottom of die 22 and quiet die holder 27, make die 22 and quiet die holder locate and be fastenedly connected, nitrogen spring device is installed in a tubular cavity volume, and inside is provided with nitrogen spring guider ring 28.Arrange piston 26 above the nitrogen cylinder of nitrogen spring 24, piston 26 is connected with push rod 25.Nitrogen cylinder connects Nitrogen source gases, thus ensures enough nitrogen pressures.
Punch profile is pocket-shape, and bottom, wider than top, is that width is maximum at 1/3 At The Height of mould.Therefore, can bend slightly toward interior curved U bolt, so that lower operation process, man-machine guarantee finished product accuracy.
Bend shaping technological process as follows:
1) matched moulds.Press machine drives dynamic model seat to move down, and make punch, die 22 closes up gradually, the bar 6 above die 22 contacts with punch and pressed down by punch and is progressively out of shape from middle part, and the order of deformation locally develops to both sides from centre.When bar be deformed into clamped mutually by punch, die 22 time, bar is bent into a U-shaped.
2) push rod 25 is pressed down in matched moulds process, along support chamber glide downwards to lowest order.
3) after U bolt is shaped, press pressure relief, dynamic model seat moves up, distress resolves in downward direction, push rod 25 is subject to nitrogen spring 24 thrust upwards, follows punch and upwards walks, and therefore makes bar still be close to punch upwards to walk, until blank leaves die 22, now push rod 25 upwards slides to highest order along support chamber.
4) take out U bolt, bend shaping end.
Bending in shaping process, the support power of push rod is provided by nitrogen spring and force value is constant.If the holding power of push rod is provided by common spring, then along with compression or the deformation of common spring, its holding power constantly changes, and is unfavorable for bending shaping.The present invention adopts nitrogen spring to make the bolt after bending follow mould and goes upward to together and leave the just demoulding after quiet mould, knockout course does not affect the A/F of U bolt, and nitrogen spring to have volume little, elastic force is large, stroke is long, stable working, manufacture accurate, the advantages such as long service life, spring curve is mild, working procedure does not need pretension, it is worked as a part for mould, easily can realize constant pressure in systems in which, thus the Design of Dies and manufacture that bend is simplified, facilitate mould install and adjust, extend the mold use life-span, curving apparatus is made to have flex capability.
The shaping laggard row quenching with Subsequent tempering of U bolt machining, modified process route is quenching---tempering, in detail as follows: bolt to be put into High Temperature Furnaces and be heated to 840-870 and spend and be incubated 1 hour, bolt after insulation is put into water and cooled, and then is placed in tempering furnace and is heated to 500-550 degree high temperature tempering 2 hours.Workpiece is taken out and corrects.
Claims (5)
1. the pre-forming device of a U bolt, described U bolt comprises both sides right cylinder section parallel to each other, connects the curved segment of two right cylinder sections, described right cylinder section is provided with screw section, the outer wall of screw section is provided with outside thread, described curved segment comprises the plat part being positioned at middle part, the transition arcs portion connecting plat part and both sides right cylinder section, it is characterized in that: comprise oil hydraulic press and casted die mould, bar to be processed, described casted die mould is placed on the working platform of oil hydraulic press, described bar is placed in casted die mould, and described casted die mould comprises upper die plate and lower plate; Be arranged between bolster and the upper press-moulding die be positioned in the middle part of bar and press down pattern; Be arranged between bolster and be positioned at the holding device of bar both sides; Act on the elastic force apparatus in bar both ends of the surface; Described holding device comprises binder block, lower bearing support, the holding cavity forming bar both sides is closed up by the opposing side of described upper binder block, lower bearing support, described lower bearing support is fixed on above lower plate, described upper binder block is flexibly connected with upper die plate, described upper binder block is provided with spring chamber, be provided with elastomer in described spring chamber, a described elastomeric end face be placed in spring chamber bottom surface and can dilatation in vertical direction.
2. the pre-forming device of U bolt according to claim 1, is characterized in that: the cross section of described plat part is rectangle.
3. the pre-forming device of U bolt according to claim 1, is characterized in that: described plat part is arc-shaped steel section.
4. the pre-forming device of U bolt according to claim 1, is characterized in that: described plat part is after adopting cold-press process to be flattened by bar by 2000t oil hydraulic press, then bends shaping.
5. the pre-forming device of U bolt according to any one of claim 1-4, is characterized in that: the radian of described plat part is between 100 °-180 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310083313.3A CN103206444B (en) | 2013-03-15 | 2013-03-15 | Preforming device of U-shaped bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310083313.3A CN103206444B (en) | 2013-03-15 | 2013-03-15 | Preforming device of U-shaped bolt |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410551967.9A Division CN104275371A (en) | 2013-03-15 | 2013-03-15 | U-type bolt bending device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103206444A CN103206444A (en) | 2013-07-17 |
| CN103206444B true CN103206444B (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310083313.3A Active CN103206444B (en) | 2013-03-15 | 2013-03-15 | Preforming device of U-shaped bolt |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103157737A (en) * | 2013-03-21 | 2013-06-19 | 广东富华工程机械制造有限公司 | U-type bolt preforming device |
| CN103522073B (en) * | 2013-11-04 | 2015-09-02 | 宁波浩渤工贸有限公司 | The process equipment of U-shaped stud |
| CN104295586B (en) * | 2014-08-25 | 2017-02-15 | 蒋福泽 | U-shaped bolt and manufacturing method thereof |
| CN105855378A (en) * | 2016-05-25 | 2016-08-17 | 艾尼科环保技术(安徽)有限公司 | Mould for manufacturing connecting sleeve of mobile pole plate cathode frame tube |
| CN109185310A (en) * | 2018-11-29 | 2019-01-11 | 海盐万瑞标准件有限公司 | A kind of compact type U-bolt |
| CN115815640B (en) * | 2023-02-20 | 2023-05-16 | 邯郸市永年区卫争紧固件制造有限公司 | Bolt processing apparatus for producing |
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| US6852181B2 (en) * | 2001-10-23 | 2005-02-08 | Consolidated Metal Products, Inc. | Flattened U-bolt and method |
| KR100923068B1 (en) * | 2009-04-30 | 2009-10-22 | 대원전기 주식회사 | U-bolt for constructing utility pole underbracing |
| CN201661573U (en) * | 2010-03-09 | 2010-12-01 | 泉州市长源机械发展有限公司 | U-bolt |
| CN202132346U (en) * | 2011-07-05 | 2012-02-01 | 浙江捷能汽车零部件有限公司 | U-shaped bolt |
| CN202228509U (en) * | 2011-10-07 | 2012-05-23 | 吉安锐迈管道配件有限公司 | U-shaped bolt |
| CN202545509U (en) * | 2012-04-23 | 2012-11-21 | 浙江兴发交通建材有限公司 | U-shaped bolt |
| CN203076423U (en) * | 2013-03-15 | 2013-07-24 | 广东富华工程机械制造有限公司 | Forming support spring structure for air-suspension U-shaped bolt |
| CN203081971U (en) * | 2013-03-15 | 2013-07-24 | 广东富华工程机械制造有限公司 | U-shaped bolt |
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2013
- 2013-03-15 CN CN201310083313.3A patent/CN103206444B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB841631A (en) * | 1957-03-15 | 1960-07-20 | Belling & Lee Ltd | Improvements in clamping devices |
| US6852181B2 (en) * | 2001-10-23 | 2005-02-08 | Consolidated Metal Products, Inc. | Flattened U-bolt and method |
| KR100923068B1 (en) * | 2009-04-30 | 2009-10-22 | 대원전기 주식회사 | U-bolt for constructing utility pole underbracing |
| CN201661573U (en) * | 2010-03-09 | 2010-12-01 | 泉州市长源机械发展有限公司 | U-bolt |
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| CN202228509U (en) * | 2011-10-07 | 2012-05-23 | 吉安锐迈管道配件有限公司 | U-shaped bolt |
| CN202545509U (en) * | 2012-04-23 | 2012-11-21 | 浙江兴发交通建材有限公司 | U-shaped bolt |
| CN203076423U (en) * | 2013-03-15 | 2013-07-24 | 广东富华工程机械制造有限公司 | Forming support spring structure for air-suspension U-shaped bolt |
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| CN103206444A (en) | 2013-07-17 |
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Effective date of registration: 20160713 Address after: 528322 Guangdong Province, Shunde District Leliu street village committee, one of the village of Port Road, No. 9 Patentee after: GUANGDONG FUHUA MACHINERY EQUIPMENT MANUFACTURING CO., LTD. Address before: 528323, three, Huanglian Industrial Road, Leliu Town, Shunde District, Guangdong, Foshan Patentee before: Guangdong Fuwa Engineering Manufacturing Co., Ltd. |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20130717 Assignee: GUANGDONG FUWA HEAVY INDUSTRIES Co.,Ltd. Assignor: GUANGDONG FUWA EQUIPMENT MANUFACTURING Co.,Ltd. Contract record no.: X2020440000054 Denomination of invention: Preforming device of U-shaped bolt Granted publication date: 20150204 License type: Common License Record date: 20200327 |
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