CN109794731A - A kind of hollow bolt and its processing technology - Google Patents

A kind of hollow bolt and its processing technology Download PDF

Info

Publication number
CN109794731A
CN109794731A CN201811516966.5A CN201811516966A CN109794731A CN 109794731 A CN109794731 A CN 109794731A CN 201811516966 A CN201811516966 A CN 201811516966A CN 109794731 A CN109794731 A CN 109794731A
Authority
CN
China
Prior art keywords
screw rod
cold
hole
hollow bolt
nut
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
Application number
CN201811516966.5A
Other languages
Chinese (zh)
Inventor
涂哲豪
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.)
Zhejiang Guosheng Auto Polytron Technologies Inc
Original Assignee
Zhejiang Guosheng Auto Polytron Technologies Inc
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 Zhejiang Guosheng Auto Polytron Technologies Inc filed Critical Zhejiang Guosheng Auto Polytron Technologies Inc
Priority to CN201811516966.5A priority Critical patent/CN109794731A/en
Publication of CN109794731A publication Critical patent/CN109794731A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a kind of hollow bolt processing technologys, the specific steps are as follows: (1) raw material prepare;(2) cold-drawn;(3) cold-heading;(4) automatic instrument;(5) it cleans;(6) rolled thread;(7) it is heat-treated (quenched).Realize that material finish is good by processing technology, automatic processing efficiency is high, and rolled thread surface intensity is good, and product intensity is high.Hollow bolt of the invention simultaneously, including nut and screw rod, the nut side are equipped with circular concave, other side central integral formula is equipped with screw rod, screw rod is equipped with threaded one end portion, and annular array is equipped with three circular holes on the screw rod of nut side, and screw rod side is machined with inner hole.Using effect is good, and excessively oily effect is good.

Description

A kind of hollow bolt and its processing technology
Technical field
The present invention relates to a kind of hollow bolt and its processing technologys.
Background technique
Hollow bolt was called oil draining bolt, and bolt seal form is radial type.It is chiefly used in petroleum pipeline, water-supply-pipe connection is close Envelope.It is widely used in automobile, ship, the engine fuel systems such as machinery and hydraulic plumbing system.
There is the hollow bolt that the excessively oily effect of hole location has some setbacks, and produces in existing hollow bolt, precision is low, light Cleanliness difference, the degree of automation is low, and during rolled thread, often will lead to bolt deformation, the bolt after the completion of final process Performance is poor, and requirement is not achieved in hardness strength, causes service life shorter, is easily damaged.
Summary of the invention
To solve the above problems, that the object of the present invention is to provide a kind of using effects is good, surface smoothness is good, automatic processing High production efficiency, the hollow bolt that rolled thread surface intensity is good, product intensity is high and its processing technology.
To achieve the above object, technical solution of the present invention:
A kind of hollow bolt processing technology, the specific steps are as follows:
(1) raw material prepare: carrying out 2 spheroidizings to round steel, spheroidizing temperature is 740 DEG C, and soaking time is 32 Hour;
(2) cold-drawn: raw material fall to see below in room temperature carries out 2 drawings, pulls to φ 12.15mm for the first time, pulls to for the second time φ 11.6mm, while material hardness control is being less than or equal to 80HRB;
(3) cold-heading: by dedicated six film multi-station cold-heading of cold headers, forming bolt head, and wherein base diameter in φ 10.87mm ~ 10.90mm, supporting surface verticality are 0.1mm, and for internal orifice dimension in φ 6.6mm ~ 6.7mm, horizontal tapering is not more than 0.15mm, production Efficiency is up to 300/point;
(4) automatic instrument: using 360 ° of NC Lathe indexing, 3 120 ° of holes are uniformly distributed, automatic drilling, while boring cross-drilled hole size For φ 7mm, cross-drilled hole fraising circulation 2 times, inner hole must not have the visible burr of naked eyes;
(5) it cleans: straight to liquid and dirt using ultrasonic wave day cavitation effect out of office, acceleration effect and direct flow effect It connects, indirectly act on, crud layer is made to be divided three, emulsification, remove and reach cleaning;
(6) rolled thread: by cold rolling technique, bolt is processed using three-wheel rolled thread, accuracy of thread M12*1.5-6g, rolling speed 20/min;
(7) it is heat-treated (quenched): bolt being quenched first, 860 ± 10 DEG C of hardening heat, the cool time 85 ± 10min is carrying out tempering, and 500 ± 10 DEG C of tempering temperature, 85 ± 5min of tempering time reaches hardness HRC33 ~ 32, tension Intensity >=800MPa.
Preferably, the cold-heading of the step (3) during complete blank, heading, aggregation, molding, chamfering, thread rolling, Undergauge and trimming process.
Hollow bolt prepared by hollow bolt processing technology described above, including nut and screw rod, the spiral shell Cap side is equipped with circular concave, and other side central integral formula is equipped with screw rod, and screw rod is equipped with threaded one end portion, close to nut side Screw rod on annular array be equipped with three circular holes, screw rod side is machined with inner hole.
Preferably, fillet processing is done by the nut corner.
Preferably, the inner hole is connected to circular hole, and the depth of inner hole is more than circular hole position.
Beneficial conditions of the invention are:
1, by the annealing to raw material, while passing through cold-drawn twice, material hardness is good, and the product of cold-drawn is compared with thermoforming Dimensional accuracy is high, surface smoothness is good;
2, using dedicated cold headers and automatic instrument, machine-shaping, high production efficiency are automated;
3, the inherence that workpiece is improved without machining and the radial direction generated when surface quality, processing are carried out using cold thread rolling process Compression improves the fatigue strength and torsional strength of workpiece;
4, heat treatment quenching and tempering is handled, and bolt hardness strength is high;
5, the depth of inner hole is more than circular hole position, and excessively oily effect is good.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of hollow bolt of the present invention.
Specific embodiment
As shown in Figure 1, a kind of hollow bolt processing technology, the specific steps are as follows: (1) raw material prepare: carrying out 2 to round steel Secondary spheroidizing, spheroidizing temperature are 740 DEG C, and soaking time is 32 hours;(2) cold-drawn: raw material fall to see in room temperature 2 drawings of lower progress, pull to φ 12.15mm for the first time, pull to φ 11.6mm for the second time, while material hardness control is small In or equal to 80HRB;(3) by dedicated six film multi-station cold-heading of cold headers, bolt head, and wherein base diameter cold-heading: are formed In φ 10.87mm ~ 10.90mm, supporting surface verticality is 0.1mm, and internal orifice dimension is not more than in φ 6.6mm ~ 6.7mm, horizontal tapering 0.15mm, production efficiency is up to 300/point;(4) automatic instrument: using 360 ° of NC Lathe indexing, 3 120 ° of holes are uniformly distributed, Automatic drilling, while cross-drilled hole is bored having a size of φ 7mm, cross-drilled hole fraising circulation 2 times, inner hole must not have the visible burr of naked eyes;(5) clear It washes: liquid and dirt directly, indirectly being made using the ultrasonic wave effect of day cavitation, acceleration effect and direct flow effect out of office With, make crud layer by points three, emulsification, removing and reach cleaning;(6) rolled thread: by cold rolling technique, using three-wheel rolled thread to spiral shell Bolt processing, accuracy of thread M12*1.5-6g, 20/min of rolling speed;(7) it is heat-treated (quenched): bolt being quenched first Processing, is carrying out tempering, 500 ± 10 DEG C of tempering temperature, is returning by 860 ± 10 DEG C of hardening heat, 85 ± 10min of cool time Fiery 85 ± 5min of time reaches hardness HRC33 ~ 32, tensile strength >=800MPa.It is complete during the cold-heading of the step (3) At blank, heading, aggregation, molding, chamfering, thread rolling, undergauge and trimming process.
Raw material are by 2 spheroidizings, then divide 2 drawings, and material is made to reach certain shape and certain mechanical property Can, and the product of cold-drawn has the advantages that dimensional accuracy is high, surface smoothness is good compared with thermoforming, by the cold headers of profession, automatically Molding, and lathe one-pass molding Bolt sizes, high production efficiency utilize ultrasonic wave day cavitation effect out of office, acceleration effect And direct flow effect is direct to liquid and dirt, indirectly effect, so that crud layer divided three, emulsification, removed and reach cleaning, most It using heat treatment is built together with good comprehensive mechanical performance afterwards, reaches hardness HRC33 ~ 32, tensile strength >=800MPa.
Hollow bolt prepared by hollow bolt processing technology of the invention, including nut 1 and screw rod 3, the spiral shell 1 side of cap is equipped with circular concave 2, and other side central integral formula is equipped with screw rod 3, and screw rod 3 is equipped with threaded one end portion 4, close to spiral shell Annular array is equipped with three circular holes 5 on the screw rod 3 of 1 side of cap, and 3 side of screw rod is machined with inner hole 6.1 corner of nut does Fillet processing.The inner hole 6 is connected to circular hole 5, and the depth of inner hole 6 is more than 5 position of circular hole.
Hollow bolt of the invention is equipped with three circular holes 5, and the depth of inner hole 6 is more than 5 position of circular hole, interior when excessively oily Hole 6 is more than one cushion effect of depth oil supply of circular hole 5, facilitates smooth excessively oily, and the design of 1 upper recess surface 2 of nut prevents from colliding with and damaging It is bad, improve intensity of colliding with.
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, above-described embodiment and explanation It is merely illustrated the principles of the invention described in book, without departing from the spirit and scope of the present invention, the present invention also has Various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention It is defined by the appending claims and its equivalent thereof.

Claims (5)

1. a kind of hollow bolt processing technology, which is characterized in that specific step is as follows:
(1) raw material prepare: carrying out 2 spheroidizings to round steel, spheroidizing temperature is 740 DEG C, and soaking time is 32 Hour;
(2) cold-drawn: raw material fall to see below in room temperature carries out 2 drawings, pulls to φ 12.15mm for the first time, pulls to for the second time φ 11.6mm, while material hardness control is being less than or equal to 80HRB;
(3) cold-heading: by dedicated six film multi-station cold-heading of cold headers, forming bolt head, and wherein base diameter in φ 10.87mm ~ 10.90mm, supporting surface verticality are 0.1mm, and for internal orifice dimension in φ 6.6mm ~ 6.7mm, horizontal tapering is not more than 0.15mm, production Efficiency is up to 300/point;
(4) automatic instrument: using 360 ° of NC Lathe indexing, 3 120 ° of holes are uniformly distributed, automatic drilling, while boring cross-drilled hole size For φ 7mm, cross-drilled hole fraising circulation 2 times, inner hole must not have the visible burr of naked eyes;
(5) it cleans: straight to liquid and dirt using ultrasonic wave day cavitation effect out of office, acceleration effect and direct flow effect It connects, indirectly act on, crud layer is made to be divided three, emulsification, remove and reach cleaning;
(6) rolled thread: by cold rolling technique, bolt is processed using three-wheel rolled thread, accuracy of thread M12*1.5-6g, rolling speed 20/min;
(7) it is heat-treated (quenched): bolt being quenched first, 860 ± 10 DEG C of hardening heat, the cool time 85 ± 10min is carrying out tempering, and 500 ± 10 DEG C of tempering temperature, 85 ± 5min of tempering time reaches hardness HRC33 ~ 32, tension Intensity >=800MPa.
2. a kind of hollow bolt processing technology according to claim 1, which is characterized in that the cold-heading of the step (3) Blank, heading, aggregation, molding, chamfering, thread rolling, undergauge and trimming process are completed in the process.
3. a kind of using hollow bolt prepared by hollow bolt processing technology described in claim 1, including nut (1) with Screw rod (3), which is characterized in that nut (1) side is equipped with circular concave (2), and other side central integral formula is equipped with screw rod (3), screw rod (3) is equipped with threaded one end portion (4), and annular array is equipped with three circular holes on the screw rod (3) of nut (1) side (5), screw rod (3) side is machined with inner hole (6).
4. a kind of hollow bolt according to claim 3, which is characterized in that described nut (1) corner does at fillet Reason.
5. a kind of hollow bolt according to claim 3, which is characterized in that the inner hole (6) is connected to circular hole (5), And the depth of inner hole (6) is more than circular hole (5) position.
CN201811516966.5A 2018-12-12 2018-12-12 A kind of hollow bolt and its processing technology Pending CN109794731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811516966.5A CN109794731A (en) 2018-12-12 2018-12-12 A kind of hollow bolt and its processing technology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811516966.5A CN109794731A (en) 2018-12-12 2018-12-12 A kind of hollow bolt and its processing technology

Publications (1)

Publication Number Publication Date
CN109794731A true CN109794731A (en) 2019-05-24

Family

ID=66556641

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811516966.5A Pending CN109794731A (en) 2018-12-12 2018-12-12 A kind of hollow bolt and its processing technology

Country Status (1)

Country Link
CN (1) CN109794731A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1443946A (en) * 2003-04-17 2003-09-24 南京汽车集团有限公司 Production process of high strength bolt with above 1300MPa
JP2004066357A (en) * 2002-08-01 2004-03-04 Minebea Co Ltd Finishing work method of joint bolt
CN101963179A (en) * 2010-10-10 2011-02-02 浙江明泰标准件有限公司 Tubing bolt, molding process and mold thereof
CN202690656U (en) * 2012-06-26 2013-01-23 昆山神昌精密金属制品有限公司 Hollow bolt
CN104400344A (en) * 2014-10-30 2015-03-11 无锡市威海达机械制造有限公司 Bolt manufacturing technology
CN204921613U (en) * 2015-08-24 2015-12-30 青岛三祥科技股份有限公司 Braking system's whelk that crosses is tied
JP2016088073A (en) * 2014-11-04 2016-05-23 エフテックス有限会社 Manufacturing method of bolt/nut made of carbon fiber reinforced polyester resin
US20160208841A1 (en) * 2014-07-07 2016-07-21 Physical Systems, Inc. Hollow metal screw and method of making
CN107335970A (en) * 2017-06-09 2017-11-10 杭州创屹机电科技有限公司 A kind of preparation method of hollow bolt

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004066357A (en) * 2002-08-01 2004-03-04 Minebea Co Ltd Finishing work method of joint bolt
CN1443946A (en) * 2003-04-17 2003-09-24 南京汽车集团有限公司 Production process of high strength bolt with above 1300MPa
CN101963179A (en) * 2010-10-10 2011-02-02 浙江明泰标准件有限公司 Tubing bolt, molding process and mold thereof
CN202690656U (en) * 2012-06-26 2013-01-23 昆山神昌精密金属制品有限公司 Hollow bolt
US20160208841A1 (en) * 2014-07-07 2016-07-21 Physical Systems, Inc. Hollow metal screw and method of making
CN104400344A (en) * 2014-10-30 2015-03-11 无锡市威海达机械制造有限公司 Bolt manufacturing technology
JP2016088073A (en) * 2014-11-04 2016-05-23 エフテックス有限会社 Manufacturing method of bolt/nut made of carbon fiber reinforced polyester resin
CN204921613U (en) * 2015-08-24 2015-12-30 青岛三祥科技股份有限公司 Braking system's whelk that crosses is tied
CN107335970A (en) * 2017-06-09 2017-11-10 杭州创屹机电科技有限公司 A kind of preparation method of hollow bolt

Similar Documents

Publication Publication Date Title
CN102672440B (en) Light rail output bevel wheel machining process
CN104526284A (en) Thin-walled bearing ring lathing process
CN104384825B (en) Machining deformation control method of bushing thin-wall part
CN106246705A (en) A kind of electric motor of automobile rotating shaft and processing method thereof
CN107160118A (en) A kind of processing technology of cross axle
CN107116347A (en) A kind of processing technology of insertion axle
CN101722262A (en) New method for producing medium and large caliber alloy steel seamless pipe by utilizing radial forging technology
CN110026751B (en) Manufacturing method of oil groove of planetary bevel gear
CN105081692B (en) A kind of processing method of the gradual change type strength structure of piston of high power diesel engine pin oilhole
EP2896471A1 (en) Method of manufacturing gear with teeth involving forging
CN109794731A (en) A kind of hollow bolt and its processing technology
CN108838632A (en) A kind of electric machine main shaft processing method
CN106826142B (en) The manufacturing method of automobile gearbox jackshaft
CN107186444A (en) A kind of hubbed flange processing technology
CN106425321A (en) Method for controlling deformation of small diameter thin-walled special-shaped rotating part
CN101823200A (en) Method for manufacturing generator shaft
CN103447773A (en) Processing technology for fixed seat
CN110977365A (en) Method for precisely machining inner gear of ultrahigh-strength stainless steel large gear ring
CN110026747A (en) The nonstandard bush processing technology of high precision
CN104772611A (en) Forging manufacturing method of gear with teeth
CN109894822A (en) The processing unit (plant) and its processing method of thin-walled roller groove body
CN106799567A (en) A kind of process for processing steel ball
CN103894799A (en) Shaft workpiece machining technique
CN112404908A (en) Method for quickly forming bottomless spherical crown steel part based on fuse wire additive
CN109277645B (en) Broaching machining method for rectangular internal spline of titanium alloy thin-wall part

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