CN103206444A - U-shaped bolt and preforming device, bending device and quenching and tempering method thereof - Google Patents
U-shaped bolt and preforming device, bending device and quenching and tempering method thereof Download PDFInfo
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- CN103206444A CN103206444A CN2013100833133A CN201310083313A CN103206444A CN 103206444 A CN103206444 A CN 103206444A CN 2013100833133 A CN2013100833133 A CN 2013100833133A CN 201310083313 A CN201310083313 A CN 201310083313A CN 103206444 A CN103206444 A CN 103206444A
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Abstract
The invention discloses a U-shaped bolt and a preforming device, bending device and quenching and tempering method thereof. The U-shaped bolt comprises mutually parallel straight column sections on two sides and a bent section connected with the two straight column sections. The straight column sections are provided with thread parts, and external threads are arranged on outer walls of the thread parts. The bent section comprises a flat part in the middle and transition arc parts connected with the flat part and the straight column sections on two sides of the U-shaped bolt. By partial flattening processing of non-thread parts, contact between the U-shaped bolt and a connecting component is changed from line contact to surface-to-surface contact, flatness of a partial arc section of the U-shaped bolt meets the design requirements, the U-shaped bolt and a shaft pipe are in good contact, and the contact area is over 95%. The contact area between the U-shaped bolt and the connecting component is increased, and looseness in connection is effectively avoided.
Description
Technical field
The present invention relates to the fastening connection piece technical field, more particularly, it relates to a kind of U bolt and pre-shaping equipment thereof, curving apparatus, hardening and tempering method.
Background technique
U bolt is generally used for the Motor Vehicle fastening connection piece, adopts the round steel material usually, is provided with externally threaded screw section at the two end part of bolt, and the screw section cooperates with specialized nut, thereby realizes being fastenedly connected of different parts.At present, the screw section of U bolt and the cross section of non-threaded portion are unified, and this kind U bolt is that line contacts with the way of contact of link for circular, and area of contact is little, and normal appearance connects not tight situation.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of U bolt bigger with the link area of contact, thereby improve the U bolt connective stability.The present invention also provides pre-shaping equipment, curving apparatus, the hardening and tempering method of above-mentioned U bolt.
The technological scheme that the present invention solves its technical problem is: a kind of U bolt, comprise both sides right cylinder section parallel to each other, connect curved section of two right cylinder sections, described right cylinder section is provided with the screw section, the outer wall of screw section is provided with outside thread, and described curved section comprises the plat part that is positioned at the middle part, the transition arcs portion that connects plat part and both sides right cylinder section.
The cross section of described plat part is rectangle.
Described plat part is that diameter is the arc steel section of R.
Described plat part is after adopting cold-press process that bar is flattened by the 2000t oil hydraulic press, bends moulding again.
The radian of described plat part is between 100-180 ℃.
A kind of pre-shaping equipment of U bolt comprises oil hydraulic press and casted die mould, bar to be processed, and described casted die mould places on the working platform of oil hydraulic press, and described bar places in the casted die mould, and described casted die mould comprises upper die plate and lower plate; Be arranged on last press-moulding die and following press-moulding die between the bolster and that be positioned at the bar middle part; Be arranged on holding device between the bolster and that be positioned at the bar both sides; Act on the elastic force apparatus on the bar both ends of the surface; Described holding device comprises binder block, lower support seat, close up the holding cavity that forms the bar both sides by the described opposing side of going up binder block, lower support seat, described lower support seat is fixed on the lower plate top, described upward binder block and upper die plate flexibly connect, the described binder block of going up is provided with spring chamber, be provided with elastomer in the described spring chamber, a described elastomeric end face places the bottom surface of spring chamber and dilatation in vertical direction.
A kind of curving apparatus of U bolt, comprise bending mould and press machine, described bending mould comprises punch, die, described die is fixed on the quiet die holder, and punch is arranged on the dynamic model seat, and described dynamic model seat is driven by press machine, also comprise support chamber, described support chamber runs through dynamic model seat and die, is provided with push rod in the described support chamber, and push rod connects the nitrogen spring device.
A kind of hardening and tempering method of U bolt is put into High Temperature Furnaces with U bolt and is heated to 840-870 degree and is incubated 1 hour, the bolt after the insulation is put into water cool off, and then place tempering furnace to be heated to 500-550 degree high temperature tempering 2 hours
The invention has the beneficial effects as follows: by non-threaded local the flattening handled, U bolt is changed into the contact of face face with contacting from the line contact of connected element, the planeness of its partial circle segmental arc reaches designing requirement, can well contact with central siphon, and area of contact reaches more than 95%.Increase the area of contact of U bolt and link, effectively prevented from connecting not tight situation.
At present the bolt hardness of the same type made of common process is HB220---250, and U bolt of the present invention is by cold moudling, and the U bolt of the 40Cr material of making, its hardness has reached HB310---and 330.The bolt grade is 4.9 grades.
U bolt outward appearance of the present invention is good, the coarse phenomenon of no peeling.
U bolt production of the present invention production domesticization significantly reduces product cost, and single products 17 U.S. dollars that can descend are for enterprise brings very big economic benefit.
Description of drawings
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-shaping device structure schematic representation of the present invention.
Fig. 4 is U bolt curving apparatus structural representation of the present invention.
Embodiment
Be example to be used for semitrailer car axletree with hanging the U bolt that is connected below, with embodiment the present invention be described in further detail by reference to the accompanying drawings.
As shown in Figure 1 and Figure 2, U bolt of the present invention is by bar 6 machine shapings, comprise both sides right cylinder section 31 parallel to each other, connect curved section 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 section comprises the plat part 32 that is positioned at the middle part, the transition arcs portion that connects plat part and both sides right cylinder section.
The cross section of described plat part 32 is rectangle.
Described plat part 32 is the arc steel section of R for diameter.
Described plat part 32 is after adopting cold-press process that bar is flattened by the 2000t oil hydraulic press, bends moulding again.
The radian of described plat part 32 is between 100-180 ℃.
The processing technology of U bolt of the present invention is such:
Be the rod iron of 25cm with diameter, cylindrical turning to diameter is 21cm---the both sides rolled thread of round steel bar---places pre-shaping in the pre-shaping equipment of the present invention, make the middle part of bar be pressed into flat pattern---bend, and certain U-shaped opening surplus (7mm)---quenching with Subsequent tempering---correction is set.Pre-shaping equipment of the present invention makes preformed U bolt have the arcuate segment of a surfacing, and at this arcuate segment, bolt contacts with axletree axis body face face, changes the mode of line face contact in the past, makes both contacts more abundant, and connection power is stronger.The present invention adopts 2000T oil hydraulic press (as calculated, for realizing high-precision bar molding effect, needing the above oil hydraulic press cold moudling of 1500T at least).
When bar placed in the pre-shaping equipment earlier, the bar both sides were by last binder block, lower support seat clamping, and both ends of the surface are then compressed by compression leg and stage clip, make the central lines of its vertical center line and upper and lower press-moulding die.The both sides, lower end of last press-moulding die are chamfered transition, the lug boss of press-moulding die lower end on the formation, this lug boss positive alignment the middle part of metal bar to be processed, need flatten the zone of moulding just.When bar has just placed in the casted die mould, the middle part of bar is identical with the both sides diameter, therefore, bar is last press-moulding die, lift certain altitude together with punch pad, upper die plate, after oil hydraulic press starts, along with oil hydraulic press upper die plate toward pressing down, distance is more and more littler between upper mould fixed plate and last binder block, until pressing together, at this moment, pressing process finishes, and the middle part of bar also is processed as flat pattern under strong pressure, thereby forms the transition arcs portion of plat part, connection plat part and both sides right cylinder section.And in the flattening process, it is long that bar can be pressed, and elastic force apparatus is set at the bar two ends can make the long amount of deformation of bar two side pressures be consistent, and flat area is remained on the medium position.
The pre-shaping equipment of bar 6 is referring to Fig. 3, U bolt pre-shaping equipment, comprise oil hydraulic press (not shown) and casted die mould, bar 6 to be processed, described casted die mould places on the working platform of oil hydraulic press, described bar 6 places in the casted die mould, and described casted die mould comprises upper die plate 8 and lower plate 1; Be arranged on last press-moulding die 10 between the bolster 1 and that be positioned at bar 6 middle parts and following press-moulding die 13; Be arranged on holding device between the bolster 1 and that be positioned at bar 6 both sides; Act on the elastic force apparatus on bar 6 both ends of the surface.
Described holding device comprises binder block 11, lower support seat 4, close up the holding cavity that forms bar 6 both sides by the described opposing side of going up binder block 11, lower support seat 4, described lower support seat 4 is fixed on lower plate 1 top, the described binder block 11 of going up flexibly connects with upper die plate 8, the described binder block 11 of going up is provided with spring chamber, be provided with elastomer in the described spring chamber, a described elastomeric end face places the bottom surface of spring chamber and 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 the lower support seat 4, described stage clip is built in that location key seat 3 and an end are pressed on the pressing plate 12 of location key seat 3, the other end is pressed on the compression leg 14, and described compression leg 14 is pressed in respectively on the both ends of the surface of bar 6.
Between described upper die plate 8 and last press-moulding die 10, be provided with punch pad 7, between described lower plate 1 and following press-moulding die 13, be provided with lower bolster 2.
Between punch pad 7 and last binder block 11, also be provided with upper mould fixed plate 17, between lower bolster 2 and lower support seat 4, also be provided with counterdie fixed plate 16.
Described upper mould fixed plate 17 is provided with and the described suitable through hole of spring chamber in the binder block 11 of going up, and a described elastomeric end passes described through hole and is pressed on the bottom surface of punch pad 7.
Also comprise caging bolt 9, described caging bolt 9 passes described upper die plate 8, punch pad 7, upper mould fixed plate, and described upper die plate 8 and last binder block 11 are flexibly connected.
Described caging bolt 9 is separately positioned on elastomeric both sides.
Described elastomer is the spring 5 of steel.
Blank after flattening is shaped places to bend again and bends shaping on the forming equipment.Thereby 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 above oil hydraulic press of 1500t, and wherein, bending mould comprises punch, die 22, described die 22 is fixed on the quiet die holder 27, and punch is arranged on the dynamic model seat 1.Dynamic model seat 21 is driven by press machine.Also comprise support chamber, described support chamber runs through whole dynamic model seat 27 and die 22 on it is set, and directes reach bar 6.Be provided with push rod 25 in the support chamber, push rod 25 connects the nitrogen spring device.
Be provided with a plurality of locating studs 29 in the bottom of die 22 and the top of quiet die holder 27, make die 22 and quiet die holder locate and be fastenedly connected, the nitrogen spring device is installed in the tubular cavity volume, and inside is provided with nitrogen spring guider ring 28.The nitrogen cylinder top of nitrogen spring 24 arranges piston 26, and piston 26 is connected with push rod 25.The nitrogen cylinder connects the nitrogen source of the gas, thereby guarantees enough nitrogen pressures.
The punch profile is pocket-shape, and top is wider than in the bottom, highly locates to be the width maximum at 1/3 of mould.Therefore, can bend inflexed slightly U bolt, so that operation is handled down, man-machine assurance finished product accuracy.
The technological process that bends moulding is as follows:
1) matched moulds.Press machine drives the dynamic model seat and moves down, and punch, die 22 are closed up gradually, and the bar 6 above die 22 contact with punch and pressed down from the middle part by punch and progressively is out of shape, and the order of deformation develops to both sides from the part, centre.When bar is deformed into by punch, when 22 of dies clamp mutually the curved U-shaped that is pressed into of bar quilt.
2) push rod 25 is pressed down in the matched moulds process, slides to lowest order downwards along support chamber.
3) after U bolt is shaped, the press machine release, the dynamic model seat moves up, the pressure of downward direction disappears, therefore push rod 25 is subjected to the thrust that nitrogen spring 24 makes progress, and follows punch and makes progress away, and make bar still be close to punch to make progress away, leave die 22 until blank, this moment, push rod 25 upwards slided to highest order along support chamber.
4) take out U bolt, bend moulding and finish.
In bending the process of moulding, the support power of push rod provided by nitrogen spring and the power value 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 moulding.Bolt after the present invention adopts nitrogen spring to make to bend is followed mould and is gone upward to together and leave the just demoulding behind the quiet mould, knockout course does not influence the A/F of U bolt, and it is little that nitrogen spring has a volume, elastic force is big, stroke is long, stable working, make accurate, advantages such as long service life, spring curve is mild, working procedure does not need pretension, it is worked as the part of mould, can in system, easily realize constant pressure, thereby simplify mould design and the manufacturing that bends, make things convenient for mould to install and adjust, prolong the working life of mould, make curving apparatus have flex capability.
The laggard capable quenching with Subsequent tempering of U bolt machining moulding, modified process route is to quench---tempering, as follows in detail: as bolt to be put into High Temperature Furnaces be heated to 840-870 degree and be incubated 1 hour, bolt after the insulation is put into water cool off, and then place tempering furnace to be heated to 500-550 degree high temperature tempering 2 hours.Workpiece is taken out correction.
Claims (8)
1. U bolt, comprise both sides right cylinder section parallel to each other, connect curved section of two right cylinder sections, described right cylinder section is provided with the screw section, the outer wall of screw section is provided with outside thread, it is characterized in that: described curved section comprises the plat part that is positioned at the middle part, the transition arcs portion that connects plat part and both sides right cylinder section.
2. U bolt according to claim 1, it is characterized in that: the cross section of described plat part is rectangle.
3. U bolt according to claim 1, it is characterized in that: described plat part is that diameter is the arc steel section of R.
4. U bolt according to claim 1 is characterized in that: described plat part is after adopting cold-press process that bar is flattened by the 2000t oil hydraulic press, bends moulding again.
5. according to each described U bolt of claim 1-4, it is characterized in that: the radian of described plat part is between 100-180 ℃.
6. the pre-shaping equipment of U bolt according to claim 1, it is characterized in that: comprise oil hydraulic press and casted die mould, bar to be processed, described casted die mould places on the working platform of oil hydraulic press, and described bar places in the casted die mould, and described casted die mould comprises upper die plate and lower plate; Be arranged on last press-moulding die and following press-moulding die between the bolster and that be positioned at the bar middle part; Be arranged on holding device between the bolster and that be positioned at the bar both sides; Act on the elastic force apparatus on the bar both ends of the surface; Described holding device comprises binder block, lower support seat, close up the holding cavity that forms the bar both sides by the described opposing side of going up binder block, lower support seat, described lower support seat is fixed on the lower plate top, described upward binder block and upper die plate flexibly connect, the described binder block of going up is provided with spring chamber, be provided with elastomer in the described spring chamber, a described elastomeric end face places the bottom surface of spring chamber and dilatation in vertical direction.
7. the curving apparatus of U bolt according to claim 1, it is characterized in that: comprise bending mould and press machine, described bending mould comprises punch, die, described die is fixed on the quiet die holder, and punch is arranged on the dynamic model seat, and described dynamic model seat is driven by press machine, also comprise support chamber, described support chamber runs through dynamic model seat and die, is provided with push rod in the described support chamber, and push rod connects the nitrogen spring device.
8. the hardening and tempering method of U bolt according to claim 1, it is characterized in that: U bolt is put into High Temperature Furnaces be heated to 840-870 degree and be incubated 1 hour, bolt after the insulation is put into water cool off, and then place tempering furnace to be heated to 500-550 degree high temperature tempering 2 hours.
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 |
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| CN103206444A true CN103206444A (en) | 2013-07-17 |
| CN103206444B CN103206444B (en) | 2015-02-04 |
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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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Cited By (8)
| 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 |
| CN103522073A (en) * | 2013-11-04 | 2014-01-22 | 宁波浩渤工贸有限公司 | U-shaped double-head bolt processing equipment |
| CN104295586A (en) * | 2014-08-25 | 2015-01-21 | 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 |
| CN110355279A (en) * | 2019-08-13 | 2019-10-22 | 天津天海精密锻造有限公司 | A kind of simple tooling for suppressing flat |
| CN114407424A (en) * | 2021-12-29 | 2022-04-29 | 余俊红 | Thermoforming mould for tablet aluminum plastic packaging |
| CN115815640A (en) * | 2023-02-20 | 2023-03-21 | 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 |
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Cited By (10)
| 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 |
| CN103522073A (en) * | 2013-11-04 | 2014-01-22 | 宁波浩渤工贸有限公司 | U-shaped double-head bolt processing equipment |
| 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 |
| CN104295586A (en) * | 2014-08-25 | 2015-01-21 | 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 |
| CN110355279A (en) * | 2019-08-13 | 2019-10-22 | 天津天海精密锻造有限公司 | A kind of simple tooling for suppressing flat |
| CN114407424A (en) * | 2021-12-29 | 2022-04-29 | 余俊红 | Thermoforming mould for tablet aluminum plastic packaging |
| CN115815640A (en) * | 2023-02-20 | 2023-03-21 | 邯郸市永年区卫争紧固件制造有限公司 | Bolt processing apparatus for producing |
| 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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| CN103206444B (en) | 2015-02-04 |
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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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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 |