SU996141A1

SU996141A1 - Friction welding method

Info

Publication number: SU996141A1
Application number: SU813279545A
Authority: SU
Inventors: Владимир Ильич Рабинович; Леонид Юльевич Лищинский
Priority date: 1981-04-22
Filing date: 1981-04-22
Publication date: 1983-02-15

Description

(54) СПОСОБ СВАРКИ ТРЕНИЕМ(54) METHOD OF WELDING THRESHOLD

1one

Изобретение относитс к машинострое .нию и может быть использовано дл управлени машинами дл сварки трением.The invention relates to machine building and can be used to control machines for friction welding.

Наиболее близким к изобретению вл етс -способ сварки трением, при котором заготовкам сообщают относительное перемещение , прикладывают осевое усилие, обеспечивающее образование точно прилегающих друг к другу поверхностей торцов заготовок, контролируют выходной параметр (температуру в зоне стыка), а при достижении последним заданной величины осевое усилие снижают, обеспечива необходимый дл проковки разогрев стыка, а затем осуществл ют проковку I.The closest to the invention is the friction welding method, in which the blanks are informed by relative displacement, an axial force is applied to ensure the formation of precisely adjacent surfaces of the end faces of the blanks, the output parameter is controlled (the temperature in the butt zone) the force is reduced, providing the necessary heating for the forging, and then the forging I is carried out.

Недостатком указанного способа вл етс необходимость экспериментального определени температуры и назначение момента снижени осевого усили по достижению заранее заданного абсолютного значени -температуры в зоне стыка. Указанна температура определ етс экспериментальным путем дл каждой tiapbi свариваемых заготовок , в зависимости от их материала и размеров . Недостатком также вл етс неопределенность момента окончани образовани The disadvantage of this method is the need to experimentally determine the temperature and the appointment of a moment of decrease in axial force to achieve a predetermined absolute value of temperature in the joint zone. This temperature is determined experimentally for each tiapbi workpiece to be welded, depending on their material and size. The disadvantage is also the uncertainty of the time of completion of education.

точно прилегающих друг к другу поверхностей торцов. Указанный момент, а следовательно , и выходные параметры процесса его характеризующие, назначаютс в любом месте переходного процесса: от по влени exactly adjacent surfaces of the ends. The specified time, and consequently, the output parameters of the process characterizing it, are assigned at any place in the transition process: from

в стыке очагов жидкой фазы до установившегос процесса тепловыделени . Така неопределенность такж.е приводит к снижению производительности процесса или к перерасходу металла, уход щего в грат. at the junction of the foci of the liquid phase prior to the steady-state process of heat release. Such uncertainty also leads to a decrease in the productivity of the process or to the waste of metal that goes into the bur.

10 Цель изобретени - снижение себестоимости и повышение производительности процесса , экономи металла, уход щего в грат. Цель достигаетс тем, что согласно способу сварки трением, при котором заготовкам сообщают относительное перемещение, 10 The purpose of the invention is to reduce the cost and increase the productivity of the process, saving the metal leaking. The goal is achieved by the fact that according to the method of friction welding, in which the blanks are informed of relative displacement,

Claims

15, an axial force is applied to ensure the formation of precisely adjacent surfaces of the faces of the workpieces to the friend, control the output parameter of the process, and when the latter reaches the specified value, the axial force is reduced, providing the junction zone necessary for the forging, and then they are forged as you. the process flow parameter takes the friction force between the welded ends, and the axial force is reduced when the friction force reaches the maximum value. The necessity and sufficiency of the change in the axial force precisely at the moment when the friction force reaches its maximum is due to the fact that at this moment the plastic settlement of the welded blanks begins. The first, increased axial force does not determine the quality of the welded joint, but allows to intensify the process, i.e., to increase its productivity. If the reduction of the axial force is carried out at the moment preceding the onset of plastic precipitation, the process prior to its beginning will be delayed in time, since it will occur at a lower pressure. In the event that the change is made at the moment following the onset of plastic precipitation, the intensity of metal removal into the burst will increase, since the sediment will occur with a greater axial force compared to the required one. As blanks, two cylindrical bars of steel 45 with a diameter of 18 mm and a length of 100 mm, obtained by cutting on a roll press, are used. After installation of the blanks in the machine and their preliminary approach, the blanks are informed about the relative movement, for which one of the blanks is started to rotate around its axis with a rotation frequency of 1200 rpm. Then apply an axial force equal to - 1200 kgf. At the same time, they begin to control the torque on the drive spindle, which characterizes the torque from the friction forces, and turn on the device for searching for the maximum torque. When the aforementioned device gives a signal that the maximum moment has been reached from the friction forces, the axial force is reduced to 850 kgf. The average basic welding time is 4 seconds, instead of 7 seconds by a known method, while maintaining the quality of the welded joint. At the same time, in the known method, the grat goes to 0.8-1.2 cm of metal more than in the proposed method. The proposed method can be used on all machines for friction welding, while reducing costs, improving process efficiency and saving metal. Claims The method of friction welding, in which the blanks are informed by relative movement, applies an axial force ensuring the formation of exactly adjacent surfaces of the end faces of the blanks, controls the output process parameter, and when the latter reaches the specified value, the axial force decreases to provide the necessary joint for heating. and then carried out a forging, characterized in that, in order to reduce the cost, increase the productivity of the process and save the metal, in honors process output parameter, taking the frictional force between the welded ends, and, the axial force reduces the frictional force when the maximum value. Sources of information taken into account in the examination 1. US patent No. 4087036, cl. In 23 K 19/02, 1978 (prototype).