SU1366360A1 - Gear shaping n/c machine tool - Google Patents

Abstract

The invention relates to a machine tool industry, in particular to CNC gear shaping machines for machining gear wheels under rolling conditions. The purpose of the invention is to increase the tool life in multi-pass machining by leveling the cutting conditions on both side cutting edges of its teeth. A CNC gear shaping machine contains a device for synchronizing the rotary drives of the rammer of the slot and dividing table, including the first and second pulsed measuring transducers installed on the ram and the dividing table and connected respectively to the first and second counters, a phase discriminator whose output through a pulse An analog converter is connected to the first input of a summing amplifier. To the second input of this amplifier, a block supplying a circular supply of a dividing table connected to the first counter is connected, and the output of the summing amplifier is connected to a dividing table drive electric motor through a power amplifier. Introduced three elements And, the element is NOT and the time relay. The first and second elements of And are connected by their first inputs, respectively, with the first and second counters and outputs - with the inputs of the phase discriminator. This element I is connected to the first input with the unit for setting the circular feed of the separating table and the output to the third input of the summing amplifier. The second inputs of the first and second elements And are connected to the output of the element NOT, the input of which is connected to the output of the time relay. The second input of the third element And is connected to the output of the time relay. 2 Il. $ (L her about: O5 with O)

Description

The invention relates to a machine tool industry, in particular to gear shaping machines for machining gears under rolling conditions.

The purpose of the invention is to increase the tool life in multi-pass machining by leveling the cutting conditions on both side cutting edges of its teeth.

Figure 1 shows a diagram of the drive; machine tool; Fig. 2 is a block diagram of the control device.

The electric motor 1, which receives energy from the CNC device 2 through the track control unit 3 and the power amplifier A, is kinematically connected through a worm separator pair 5 to the ram 6 of the cylinder 7, which is the driving coordinate of the functional connection (chain, rolling). The slave coordinate of this link is the dividing table 8, on which the workpiece 9 of the wheel being cut is mounted,

The functional connection between the ram 6 and the index table 8, which reproduces the gearing, is carried out by the synchronization device.

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than the second input directly, and the third input - through the third element And 24.

The output of the summing amplifier 23 through the power amplifier 25 is connected to an electric motor 26, kinematically connected through a worm separator pair 27 to the separating table 8.

The second inputs of the first 13 and second 18 elements And connected through the element NOT 28 with the output of the electronic relay 29 time. The second input of the third element And 24 is connected to the output of the relay 29 time.

The electronic time relay 29 comprises a reference frequency generator 30, a pulse counter 31, a comparator 32 codes, a code setting unit 33, a driver-amplifier 34 and a control device 35.

The feed drive of the radial incision of the longitudinal table 36, on which 5 the separating table 8 is installed, is realized through a screw gear 37 from the electric motor 38, controlled from the CNC device 2 through the track control unit 39 and the amplifier

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their drives. This device includes power 30 0.

a first pulsed measuring transducer 10, for example, a photoelectric connected through a series of first pulse signal amplifier 11, the first counter 12 and the first element I 13 to the first input of the phase discriminator 14, and mounted on a divider 35

The drive of the reciprocating movement of the motor 41, in which the ram 6 of the cylinder is mounted, is carried out by the electric motor 42 and the rocker mechanism 43.

As electric motors I, 26, and 38, high-memeitic DC machines are used, which allow the step-by-step adjustable table 8 to carry out a second pulse measurement of circular frequency. Moreover, the electric converter 15, is connected to the motor 1 of the drive specifying the co-ordinate through a series of second amplifier 16 of the pulse signal, the second counter 17 and the second element And 18 with the second input of the phase discriminator 14.

The counters 12 and 17 are connected to the I9 and 20 sets of the gear ratio of the functional link. To the output of the first counter I2 is connected the input of the block 21 of the task of the circular feeding of the separating table 8.

The output of the phase discriminator 14 through a pulse-analog converter 22 is connected to the first input of summing amplifier 23. The second and. The third inputs of this amplifier are connected to the output of the block 21 for setting the circular feed of the separating table. At5

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The dinates and the drive motor 38 are controlled independently of the method of setting the program from the CNC device 2.

The gear ratio of the functional connection of the stolsel 6 and the separating table 8 is set by blocks 19 and 20 as a coefficient determining the ratio of the circular frequency of the stolsel 6 and the circular frequency of the dividing table 8. The circular feed of the separating table is set by block 21, which sets the circular feed of the table.

The infeed feed rate and the number of embedding steps are set programmatically by setting the program to; CNC device. The time during which at each successive embedding stage an additional rotation of the dividing table with the workpiece relative to the groove takes place is set by the block 33 to set the time relay code 29. The start of the time relay is carried out according to the program simultaneously with the start of the corresponding embedding stage.

The machine works as follows.

The workpiece 9 is installed on the dividing table 8. Then set the necessary cycle of work and speed of movement of the executive bodies of the machine.

When the motor 42 is turned on, it receives a reciprocating motion P, a sleeve 41 and 6 sleeves 7. After accelerated movement of the longitudinal-table 36 to the initial point for processing, according to the program, the electric motor 38 switches to the working infeed feed (P motion) to a part of the tooth height corresponding to the amount of incision in the first draft pass, and at the same time the electric motor 1, which sets the coordinates, informs the movement B, feeds 6 with the working circular feed. Simultaneously, the synchronization device of the functionally connected drives is also turned on.

The first pulse transmitter 10 generates a high frequency pulse signal. This signal through the amplifier 11 of the pulse signal enters the first counter 12, where the signal is divided according to the coefficient set at block 19. The signal from the output of the first counter 12 starts the block 21 for setting the circular feed of the dividing table. Unit 21 generates an analog signal, which, after passing through amplifiers 23 and 25, rotates the motor 26 of the slave coordinate - the separation table 8 (movement E).

The signal from the output of the first counter 12 through the first element I 13, opened at the second input, is fed to the first input of the phase discriminator 14. The second impulse measuring converter 15 simultaneously with the beginning of movement B produces a high-frequency signal, which after preamplification in the amplifier 16 of the signal enters the second

the counter 17, where it is divided in accordance with the coefficient specified in block 20. From the output of the counter 17 through the second element And 18, open through the second input, the signal enters the second input of the phase discriminator 14.

As a result of comparing the signals

produced by master and slave

coordinates, at the output of the phase discriminator, a correction signal is formed, which, after being converted to analog form in the pulse-to-analog converter 22, enters the summing amplifier 23, where the correction of the control signal of the dividing table drive motor 26 coming from the circular feed reference unit 21 occurs.

After embedding into a predetermined part of the height of the tooth according to the program, the insertion motion P2 stops also during

full rotation of the dividing table 8 is carried out the first rough pass of processing the workpiece 9 of the wheel being cut with coordinated movements Bj and B (rolling). Then when

Continuing run-in is included in the punching-in movement for plunging a ram into the second part of the allowance. At the same time, the control device 35 of the electronic time relay 29 is turned on.

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Timed relay time 29

the time signal arrives at the second input of the third element AND 24 and opens it for the signal from block 21 to the third input of the summing amplifier 23. At the same time, the time delay signal through the element 28 closes the elements 13 and 18. As a result, the correction signal for

summing amplifier 23 is not received. At the same time, in this amplifier, the addition of two signals arriving at the second and third inputs from block 21 occurs. As a result, the dividing

the table 8 is additionally rotated and the workpiece is displaced with respect to the groove on the corner bar so that the cutting allowance on the passage will be carried out along one side

cutting edge Then, according to the program, time control device 35 is turned off. At the same time or after a certain time, the plunging motion of the Pz stops.

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After turning off the time relay 29, element 24 is closed and element 13 and elements 13 and 18 are opened through element 28. As a result, the synchronization device of the drives is rebuilt into the original structure and during the full rotation of the dividing table 8 a second roughing passage is performed by means of rolling.

After the second roughing run is completed, a plunge cycle is repeated for the next pass, and so on. Moreover, before each subsequent roughing pass, the structure of the synchronization device of the drives is rebuilt, providing the angular displacement of the workpiece relative to the die to the side opposite to its displacement in the previous passage, which ensures the alternation of the lateral cutting edge along which the cutting is performed on the passage.

Similarly, plunging is performed before the finishing pass. However, in the final incision, carried out by the Minimum value, the additional movement of the workpiece is set relative to the slot so that the cutting allowance is evenly distributed between the two side cutting edges of the teeth of the slot.

Claims (1)

Invention Formula CNC gear shaping machine containing a device for synchronizing the rotational drive drives 6 and dividing table, including first and second pulse measuring transducers installed on the ram and dividing table and connected respectively to the first and second counters, phase discriminator, the output of which is connected to the first input of the summing amplifier through the pulse-analogue converter, to the second input of which the unit for setting the circular feed of the dividing table connected to the first counter is connected, and the output of the summing amplifier is connected to the drive motor via a power amplifier yes divisive table, about t l and due to the fact that, in order to increase tool life in multipass processing by leveling the cutting conditions on both side cutting edges of its teeth, the first, second and third elements AND, the element NOT and the time relay, the first and second elements AND are connected into the machine the first inputs, respectively, with the first and second counters and outputs — with the inputs of the phase discriminator; the third element I is connected with the first input to the block for setting the circular feed of the separating table and the output with the third input of the summing amplifier; l, second inputs of first and second AND gates connected to the output of NOT circuit whose input is connected to the output time switch and the second input of the third AND gate connected to the output time switch. -X " one  one ABOUT & Q P at “M; F.