SU1380868A1 - Method of mechanical working of blanks - Google Patents

Abstract

The invention relates to the field of material processing by cutting and can be used in the processing of billets of hard-to-cut alloys. The aim of the invention is to increase the productivity of the process and the durability of the cutting tool. For the processing of the workpiece 1 by the cutting tool 2 with the preheated cutting part 3, its temperature is controlled within the limits corresponding to the quasi-plastic state of the tool material and carried out by means of discrete controlled distribution of the liquefied inert gases on the cutting part. 1 il.

Description

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The invention relates to the processing of metals by cutting and can be used) {o when processing workpieces from difficult-to-work rakes,

The purpose of the invention is to improve the process performance and cutting tool life.

The drawing shows the device that implements the proposed method

The method of machining the blanks is carried out as follows.

The processed zag heating 1 is installed in the chuck of a lathe and the surface 2 is formed by the tool 2, the cutting part 3 of which is preheated outside the sources and control the temperature by sensor A. At the same time, the required temperature range corresponding to the quasi-plastic state of the tool material is provided processing by discrete distribution on its cutting part 3 of liquefied inert gases supplied from the tank 5 by a device for pumping and spraying laziness, which is a connection with a capacity of 5, a pipeline 6 with an electromagnetic valve 7, a chamber 8, divided by a membrane 9 into two cavities, the cavity 10 being smaller, from which they are connected

The pneumatic circuit is provided with a pipe 11 equipped with a spool 12. The control electrical winding of the latter is connected to the thermocouple of sensor 4, and the large cavity 13 is connected by a pipe 14 to a solenoid valve 15 with a spray chamber 16 equipped with a swirler 17 and a nggsadky 18 of honeycomb structure 19 from a mile. A heat pipe 20 is provided to supply heat to the surface of the tool 2 to preheat it.

The device implementing the method works as follows.

The pre-cutting part 3 of the tool 2 is heated with an absorbing heat pipe 20, connected to the heater to a temperature corresponding to the lower limit of the quasi-plastic state of the tool material, which does not have a brittle fracture of the cutting edge. Upon reaching the lower temperature limit, the corresponding quasioplastic

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Combined with the heat source, it is removed from the heat pipe, which is then connected to a cooler. At this time, the tool 2 enters into operation, and the excess heat that occurs during the processing is removed by the heat pipe 20. When the heating temperature of the cutting part, in which the material state of the head part from the kpazyplastic part goes into plastic, the signal from the sensor 4 temperature is transferred to the spool 12, which passes compressed air into the cavity 10. At this time, the solenoid valve 1.5 opens. Under the action of compressed air, the membrane 9 is deformed and the liquefied gas, which is flowing through the cavity 13, is fed through pipe 1I into the spray chamber 16, where the swirler 17 passes through spiral channels, gets onto the end surface of the nozzle 18 and through the holes 19 is fed to the front edge of the cutter as separate sprayed droplets that evaporate without retaining the liquid 4) base. This way, the tool 2 is cooled and the heating temperature is controlled within the limits corresponding to the quasi-plastic state of the material of the cutting part. During the supply of liquefied gas to the instrument, the temperature is controlled at the front edge of the cutter using a temperature sensor 4, which, when the lower temperature limit of the quasi-plastic material of the cutting part is reached, sends a signal to the spool 12, which stops the flow of compressed air into the cavity 10 and connects it to the atmosphere. In this case, the membrane 9 returns to its previous state, displaces the air from the cavity 10, and part of the liquefied gas from the pipe 14 returns back to the cavity 13. After that, the electromagnetic valve 15 is closed, and the valve 7 is opened and the liquefied gas from the tank 5 flows into cavity I3 based on the prin- Utma communicating vessels. Upon reaching the lower limit of the temperature of the quasi-plastic state of the cutting part of the tool, heat is removed from it during processing by one heat pipe 20.

An example. The workpiece is processed from hard-to-work31380868

Claims (1)

The first heat-resistant alloy in the following formula of the invention: the number of revolutions of the workpiece 24 revolutions; cutting speed 35 m / min; Machining method inlet 0.3 mm / rev; cutting depth, cooking, including preliminary 3.5 mm; heating temperature tool-controlled heating of the cutting part of the ment 983-1023 K; the tool and the subsequent formation are cooled with the aid of a heat pipe or the reverse surface of the inert gas; cutting material, differing in that of the VK8M tool; cutting speed, with the aim of increasing tool production 90 min; the number of the process flow and the tool life of the 3-, machining time of the treatment, the regulation of the temperature of the pro 188 min; the auxiliary time is produced within the limits corresponding to the processing of 7.2 min. of the quasi-plastic state of the material Compared with the known variant of the tool, and its mechanical processing volume is observed — by discrete control over the increase in the productivity of the projected distribution to the cutting process and the resistance of the cutting tool part of the liquefied inert gas, call.