JPS6122323B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerical control device having an automatic feed rate changing function. An object of the present invention is to provide a numerical control device that can gradually change speed or feed amount according to a certain rule as position control or movement progresses.

Conventionally, in deep hole drilling, etc., there is a demand to reduce the feed rate as the drilling depth increases, but in normal numerical control, the amount of movement of the drill is divided into sections and commanded. Although the feed rate corresponding to the section is specified, in this method, the command for machining one deep hole must be divided into several parts and the program is complicated.

According to the present invention, deep hole drilling can be performed by simply giving commands indicating the total travel distance of the drill, the initial speed of feed, and the degree of change in feed speed.

The invention will now be explained with reference to the drawings.

FIG. 1 is a block diagram of a conventional numerical control device.

101 is a command input device such as a tape reader or a keyboard, 102 is a decoder, 103 is a movement command circuit, 104 is a speed command circuit, 105 is a pulse distribution circuit, and 106 and 107 are an X-axis servo circuit and a Y-axis servo circuit, respectively. .

A constant speed signal is sent from the speed command circuit 104, which controls the calculation cycle of the pulse distribution circuit 105 as a train of equally spaced pulses.

FIG. 2 is a diagram showing how the conventional device moves. The intervals between times t1, t2, t3, . . . are constant, and the amount of movement ΔZ at each time is constant. That is, it shows that the feed rate is constant.

FIG. 3 is a block diagram of the numerical control device of the present invention.

301 is a speed change command circuit, and 302 is an increase/decrease circuit.

A movement speed change degree command signal Q is given to the speed change command circuit 301, and a movement amount signal △ in a certain section is given to the speed change command circuit 301.
In combination with Z, an increase/decrease rate signal △V is sent out,
It is input to the increase/decrease circuit 302.

In the increase/decrease circuit 302, the speed command circuit 104
The feed speed signal F sent from
is sent.

On the other hand, the total movement command signal Z sent from the movement command circuit 103 is input to the pulse distribution circuit 105, and the gradual change is distributed as pulses in the calculation cycle.
Moves by the total amount of movement commanded.

FIG. 4 is a diagram showing an aspect of movement according to the present invention.

Since the moving amount ΔZ in each section changes with the feed speed, the moving amount changes as ΔZ=, , , . . . at equal time intervals of time t1, t2, t3, .

FIG. 5 is a detailed explanatory diagram of the speed change command circuit 301.

Q01,Q from tape reader or keyboard
A speed change command signal Q representing the degree of change in feed speed given in the form of 02, . . . is given. For example, when a command Q02 is given, the speed level is pre-stored in a numerical register so that it changes as 100% in the first section, 90% in the next section, and 80% in the third section. .

Then, as the movement amount △Z progresses, △Z=,
When a signal corresponding to , , . . . is input, a feed rate increase/decrease rate signal ΔV in that section is output.
For example, if the speed change command signal Q=Q02 is commanded and a signal corresponding to the movement amount △Z= is input, an increase/decrease rate signal △V corresponding to a speed degree of 80% of the initial speed is sent out. .

FIG. 6 is an explanatory diagram of the increase/decrease circuit 302.

A feed rate signal F is commanded as pulses with an interval of P seconds, which corresponds to the initial feed rate.

Specifically, the increase/decrease circuit 302 is a counter or a multiplier.

In the increase/decrease circuit 302, the feed rate signal F is converted into pulses with an interval of P' seconds by the increase/decrease rate signal △V and sent out as the calculation cycle control signal C. On the other hand, this signal It is used as a signal to give and is sent to the speed change command circuit 301.

Note that the speed change command circuit 301 may use a function generating device such as a DDA (Digital Differential Analyzer), instead of storing the information using a register.

As described above, according to the present invention, it is possible to improve tool life and chip removal performance, and to simplify programming.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional numerical control device, Fig. 2 is a diagram showing the state of movement in the conventional device, Fig. 3 is a block diagram of a numerical control device of the present invention, and Fig. 4 is a diagram of a numerical control device of the present invention. A diagram showing the mode of movement, Figure 5 is the speed change command circuit 3
01 is a detailed explanatory diagram, and FIG. 6 is an explanatory diagram of the increase/decrease circuit 302. 101... Command input device, 102... Decoder, 103... Movement command circuit, 104... Speed command circuit, 105... Pulse distribution circuit, 106...
X-axis servo circuit, 107...Y-axis servo circuit, 3
01...Speed change command circuit, 302...Increase/decrease circuit.

Claims (1)

[Scope of Claims] 1. A numerical control device that changes the amount of movement of a tool as the movement progresses, comprising: a command input device that sends a command signal for the degree of change in the speed of movement of the tool; and a command for the command input device. a movement command circuit that receives a command from the command input device and sends out a total movement command signal for the tool; a speed command circuit that receives a command from the command input device and sends a feed speed signal for the tool; and the change degree command signal and a certain section. a speed change command circuit that inputs a movement amount signal within and sends out an increase/decrease rate signal; and a speed change command circuit that inputs said feed speed signal and said increase/decrease rate signal and sends out a movement amount signal and arithmetic cycle control signal within said certain section. The tool is characterized by comprising an increase/decrease circuit and a pulse distribution circuit that distributes pulses in a calculation cycle according to the calculation cycle control signal, and moves the tool by a movement amount according to the total movement command signal. Numerical control device with automatic feed change function.