SU1734991A1 - Method of control of round cut-in grinding and device - Google Patents

Abstract

The invention relates to a machine tool industry, in particular to methods for controlling circular plunge grinding, for example, on a circular grinding machine. The aim of the method is to improve the quality of the machined parts and the productivity of the equipment at the stage of finishing grinding by actively controlling the process at the nursing stage, which allows to optimize the duration of this stage. To do this, after rough grinding to an intermediate size, nursing is performed with control of the current material removal and surface roughness, and when the roughness reaches the required value, the machine is switched to the final grinding, which is performed with the material removal rate fixed at the time the roughness reaches the specified value to reach final size. 2 sec. f-ly, 2 ill. (Ls

Description

The invention relates to a machine tool industry, in particular to a method for controlling circular plunge grinding, for example, on a circular grinder.

The purpose of the invention is to improve the quality of the machined parts and the productivity of the equipment at the stage of finishing grinding by actively controlling the process at the nursing stage, which makes it possible to optimize the duration of this stage.

FIG. Figure 1 shows a graph of the actual removal rate of the allowance during the round plunge grinding cycle; in fig. 2 is a block diagram of a device for implementing the method.

FIG. 1 indicates: Vc is the feed rate of the caliper at the stage of rough grinding; Vi is the actual feed rate (removal rate of allowance) at the stage of rough grinding; V2 - removal rate allowance at the stage of stopping the wheelhead; Vs - removal rate of allowance at the stage of final grinding.

The device contains a detail size sensor 1, a differentiator 2, a level 3 master, a first subtractor 4, a 5 level master, a second subtractor 6, a 7 level master, a third subtractor 8, the active part roughness sensor 9, a key 10, null-bodies 11-13 , differentiators 14-16, element OR 17, dials 18–20 speeds, counter 21

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pulses, switch 22, engine control system 23, 24, set zero button 25.

The device works as follows.

The processing cycle begins with a rough grinding step, the speed of movement of the grinding head at which is determined by setting the level adjuster 18 (FIG. 2), and through the switch 22 the signal enters the engine control system 23 and sets the rotation speed of its rotor grinding grandma. Simultaneously with the beginning of grinding, at the output of the part size sensor 1, the signal that arrives at the input of the subtractor 4 is measured. The rough grinding stage continues until the value of the diameter determined by the level control unit 3 is reached (zone OA in Fig. 1 ), while the subtractor 4 generates a signal that closes the key 10 through the null organ 11 and simultaneously through the differentiator 14, the OR element 17 enters the pulse counter 21 and then switches to the switch 22 in the form of a binary code 01 signal. In this state master 19 level Corresponding to stop movement of the wheelhead. The stock removal at this stage is due to the unloading of the technological system, the removal rate is calculated by differentiator 2 (zone AB in Fig. 1).

When the key 10 is closed, the signal from the active roughness control sensor is fed to the input of the second subtractor 6, which is triggered when the specified roughness value is reached, which is determined by the unit of level 5. In this case, the subtractor 6 generates a pulse, which through the null-body 12, the differentiator 15 and the element OR 17 enters the pulse counter 21, at the output of which a binary code 10 signal is output to the switch 22. In this case, the output of the differentiator 2 sets the speed the movement of the wheelhead using the engine 24 at a speed that provides the desired roughness. This stage of finishing grinding is carried out until a predetermined diameter value is reached, which is determined by level adjuster 7 (zone BD in FIG. 1). In this case, the subtractor 8 is triggered. It outputs a pulse through the null organ 13, the differentiator 16 and the OR element 17 to the pulse counter 21, the output of which sends a signal in binary code 11 to the control inputs of the switch 22. Switching occurs

setter level 20, which corresponds to the accelerated removal of the grinding headstock from the part. Before starting the grinding of the next part, it is necessary to transfer the counter 21 by the zero setting button 25 to

state 00.

Claims (2)

1. The method of controlling the circular mortise grinding in the cycle, including rough grinding, nursing and finishing Grinding, characterized in that, in order to improve the quality of workpieces and productivity, the current value of the stock removal rate, the diameter of the part and the roughness are measured the machined surface and the feed to the final grinding include at the moment of reaching the specified roughness value, and the feed rate is set equal to the actually measured speed removal allowance at a given time. 2. A device for controlling a circular mortise grinding comprising a pulse counter, a part size sensor, three zero-bodies and a key different In order to improve the quality of machined parts and productivity, the device is equipped with three speed level adjusters, two diameter level adjusters, a roughness level adjuster, four differentiators, three subtractors, an active roughness control sensor, an OR element, a switch, and the first inputs of two subtractors are connected to a size sensor the second part is connected to the diameters level control devices, the first input of the third subtracter is connected via a key with the active roughness control sensor, and the second input is connected to unit of the level of roughness, and the outputs of the subtractors are connected to the inputs of zero-bodies, the outputs of which are connected through differentiators to the inputs of the OR element, the output of which is connected to the input of the counter, the fourth differentiator with its input is connected to the sensor of the size of the workpiece, and the output with the switch, the outputs of the pulse counter are connected to the switch to which three control devices for the speed of lateral movement of the grinding headstock are also connected. yy,