Method of producing spring and production line to this end

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in production of spring for car and railway car bogie suspensions. Proposed method comprises rejection of springs at initial step and heating the bars for spring winding at mandrel. Then spring being wound is subjected to continuous sequential quenching by dipping the mandrel with wound turn into quenching bath and holding it therein. Spring is tempered in furnace at preset temperature for preset time interval defined by steel grade and cooled down to 30-80°C. Then, spring is squeezed, its operating parameters being controlled, and subjected to shot-blasting. Proposed production line comprises bar rejection device, integral technological module composed of bar heater, spring winder and spring continuous sequential quenching device, cooler, squeezer, sand-blasting unit and device to control spring performances, all being functionally and kinematically coupled.

EFFECT: stable characteristics and quality.

4 cl, 1 tbl, 1 dwg

 

The invention relates to the manufacture of springs made of hot wound, which can be used in the automotive industry, for example, suspensions of cars, trucks, railway wagons.

A known method of manufacturing a high-loaded compression spring, which includes the winding of the spring, heat treatment, polishing of the ends, thermocalc and blast hardening, thermocalc produce after blast of cold working at a temperature of 200-250°C (RF patent No. 2208056, IPC C21B 9/02, publ. 10.07.2003).

The disadvantage of this method is not sufficiently stable quality of the products obtained, due to the lack of control characteristics.

Known automatic line for production, testing and sorting coil springs (patent RF №2005572, publ. 15.01.1994, containing United by transporting equipment loader rod blanks, heating furnace, spring-coiling machine, the units for quenching and tempering springs, blast installation and setup for control efforts springs, including the enforcement mechanism of the compression springs, the load device and a sorting mechanism, and a control system.

Famous line has a spring-coiling machine and Assembly for tempering springs, which are functionally separated, so there is no way technology is practical quality management nauywaima springs, that leads to low performance springs, and the sort operation only excludes to consumers springs low quality.

The closest technical solution is an automatic line for manufacturing coil springs, containing set the course of the process and connected vehicle charging device, an induction heater, forging rolls, machine for coiling springs, hardening installation, tempering machine, a device for cooling springs, press control compression springs and blasting installation (the magazine "die Forging production No. 4, 1984, p.16-17).

In the known construction line operations of winding and quenching are performed separately on different hardware, so not achieved stable production of springs of high quality, in addition, in the automatic line does not provide quality control of preparations for spring.

The objective of the invention is to obtain high-strength spring steel with stable quality characteristics.

The technical result is achieved due to the rejection bars with through ultrasonic flaw detector, preventing the production of spring bars with internal and external defects, and also is the production of a single process module, conducting induction continuous-sequential heating rods under the wrapped spring winding springs with continuous-sequential quenching nauywaima turns of spring in water or an aqueous solution of polymer-hardening liquid.

To achieve these objectives, the method of manufacturing springs at the initial stage, umbraculifera bars at the initial stage, the heating winding of the spring on the mandrel, hardened nalivaeva spring by continuous-sequential lowering of the mandrel with the wound coil in the quenching bath and soaking in it fully wound spring vacation in an oven at the specified brand of steel temperature and time, cooling to ambient temperature, then produce technological compression springs, controlling their power characteristics, and shot blasting. At the final stage produces the color of spring.

This object is achieved by using lines for the manufacture of springs made of steel, which contains the device rejection of rods, a single processing module, comprising a heating device for rods, winding and hardening springs, furnace for tempering, cooling unit, the Assembly process of the compression springs to control their power characteristics and installation blasting. A single processing module, which contains functionally and kinematically associated heating device for rods, the device is spring coiling device and continuous-sequential quenching. A single processing module executed automated. The Assembly process of the compression springs contains the centering spring-support, push the punch elements for the determination of resistance to compression of the spring. The line also includes the installation of color.

The drawing shows a production line of springs. The table presents the comparison of the characteristics of the springs produced by the proposed and the technology used.

Production line for spring device rejection, for example, an acoustic detector with shelving 1, reloading the rack 2, the process module 3, including induction heater machine for winding and the quenching bath, oven vacation 4, a condenser 5 bath, the robot arm 6, unit 7 of technological precipitation with control power characteristics of the springs, kobelt 8, unit 9 integrated control of geometrical parameters of the spring and hardness, unit 10 coloring springs, post packing 11.

The line work is carried out as follows.

Dimensional workpiece made of spring steel, are served on the rack detector 1, which produces the control rods to the lack of surface and internal defects in the metal. Rods deemed fit, proceed to overload the rack 2 is technological module 3, sequentially passing through the inductor of the induction heater of the process module 3 is heated to a temperature of 950-1100°C, depending on the steel grade, and consistently act in a winding machine of the process module 3. When the lesson winding mandrel of the machine winding the spring source to the winding position of the feed rollers serves rod into the grip frame and starts the winding of the spring. Naviwala spring together with the mandrel continuously sequentially vertically lowered into the quenching bath with an adjustable level of the medium (water or an aqueous solution of polymer-hardening liquid), which sequentially as lowering nauywaima coils springs are hardened. Wound fully spring is maintained in a quenching bath desired, depending on the steel grade, the time. During the return of the mandrel, the spring is removed from the mandrel and is directed into the furnace vacation 4. Winding the mandrel is returned to its original position for winding the next spring. To improve the performance of the automatic spring coiling process module can have several pots that work consistently.

Bake for vacation 4 has an operating temperature of 200-500°C., a specific value which is determined by the mark steel. After the holidays springs are cooled in a cooling bath 5 with water, until the temperature is 30-80°C, and served with the help of a robot arm 6 unit 7 technological precipitation - samevolume, where, after a 3-5-fold compression is the control force characteristics of the spring. Benevolenza spring arrives on the shot-blasting installation 8. After surgery, shot peening of springs received by the device 9 integrated control of geometrical parameters of the spring, which produces the control and sorting into groups on the tall sizes. Next spring is coming to the conveyor spray chamber 10 for coloring polymeric dyes in an electrostatic field and polymerization at a temperature of 240-260°C. Painted springs act on the post 11 packaging of finished products.

The method was tested in the production of spring steel THF, SA, SG and other several sizes of rods with diameters from 10 to 36 mm Test springs indicate increased complex structural and geometric characteristics of the springs.

Poster and performance testing of springs produced according to the invention showed that the springs have increased tenfold durability with virtually no draught.

A method of manufacturing springs and the line for their production
T the blitz
No.The indicator descriptionThe value of the index
experienced springconventional springs
1.Limit deviations:-0,5±2,5
the inner diameter, mm
on the outer diameter, mm-0,9±2,5
2.Maximum deviations in height in the free state, mm1,759
3.The residual strain after compression until it touches turns (3 compression)mm0,35
4.Durability, at rated load, number of cycles 10610·106not destroyed0,4-0,5·106collapsed

Cab manufacture the Oia spring steel bars, including umbraculifera bars at the initial stage, the heating winding of the spring on the mandrel, hardened nalivaeva spring by continuous-sequential lowering of the mandrel with the wound coil in the quenching bath and soaking in it fully wound spring vacation in an oven at the specified brand of steel temperature and time, the subsequent cooling of the spring to a temperature of 30-80°C., technological compression springs with control power characteristics and shot blasting.

2. The method according to claim 1, characterized in that at the final stage produces the color of spring.

3. Production line for spring rods of steel containing device rejection rods, modular, consisting of functionally and kinematically connected device heating rods, spring coiling mandrel and device hardening springs quenching bath made with the possibility of continuous-sequential lowering of the mandrel with the wound coil and shutter fully wound spring, a furnace for tempering springs at a given brand steel temperature, the cooling unit, the Assembly process of the compression springs to control their power characteristics and installation shot peening of springs.

4. Line according to claim 3, characterized in that it contains the installation coloring springs.



 

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Spring // 2194201
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