JPH0353642B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a feed rate command device in a numerical control device.

(Prior Art) In numerically controlled machining, the optimum feed rate is determined in consideration of the life of the blade, machining time, etc. If the machining speed is increased in an attempt to shorten the machining time without considering this optimal feed rate, the load on the cutter will increase, resulting in breakage or chipping of the cutter. If the machining speed is made low, the machining time will be too long and efficient numerical control machining cannot be performed. Generally speaking, the optimum machining speed is determined by taking into consideration various factors such as the hardness of the workpiece, the size of the machining allowance, the sharpness of the cutter, the deflection of the cutter, and the composition of the machine. When a machine is actually operated after perforating the instruction tape, it often happens that the operating speed is too fast and the blade breaks, or that the operating speed is a little too slow. For this reason, this type of numerical control device is equipped with a plurality of dials 1, 2, and 3 for specifying the feed speed as shown in Figure 1, and the command tape is set to either F0 (fast forward), F1, F2, or F3. is commanded to designate a predetermined dial, and during actual machining, the designated dial is turned to obtain the optimum feed speed (F1-digit feed speed command). In Fig. 1, 1, 2, and 3 are dials for adjusting the feed speed, 4, 5, and 6 are scale plates for the feed speed, and 7, 8, 9, and 10 are lamps. At the top of is F0, F1,
Symbols F2 and F3 are attached, and when any one of F0, F1, F2, or F3 is commanded from the tape, the corresponding lamp lights up.

Fig. 2 is a circuit block diagram for realizing this type of feed speed command method described above, in which a plurality of dials 1 to 3 specify the feed speed, and pulses with a frequency corresponding to the specified value of each dial are generated. Multiple pulse oscillators 11 to 13, oscillator 1 for fast forwarding
4. A tape 15 for specifying which pulse train to select from among the output pulse trains of the oscillators 11 to 14, a tape reader 16, a register 17 for storing commands F0, F1 to F3 for the tape 15, and a register 17 for storing commands F0, F1 to F3 for the tape 15; Gate 1 selects the output pulse train of a predetermined pulse oscillator based on the stored speed command
8. It is equipped with a plurality of lamps 7 to 10.

(Problem to be Solved by the Invention) In this way, this type of system allows setting the optimum feed rate according to the processing situation by rotating the dial according to the feed rate command from the tape. , is an effective method. However, since it requires a large number of dials 1 to 3 and oscillators 11 to 14, the cost is very high, and it also requires a considerable amount of mounting space, making it difficult to downsize.
In particular, in a numerical control device that adopts such a feed rate command method, the more dials there are, the easier it is to process and program, so it is normal to have nine dials, which increases the number of parts and requires mounting space. increase

Therefore, the present invention uses a method that allows setting the optimum feed rate according to the machining situation, and also provides a new feed rate command device with a simple configuration that has a small number of parts and requires very little mounting space. The purpose is to provide.

(Means for solving the problems) According to the present invention, in order to achieve the above-mentioned object,
In a movable object feed rate command device of a numerical control device, a feed rate command information input means for inputting feed rate command information, a table for storing a plurality of pieces of feed rate command information and a plurality of addresses corresponding thereto, and a table for storing a plurality of pieces of feed rate command information and a plurality of addresses corresponding thereto; A storage means for storing addresses greater than the number of stored addresses, a plurality of feed speed values corresponding to these addresses, and a table containing addresses corresponding to the feed speed command information input from the feed speed command information input means. a calculation means having an increase/decrease means for increasing/decreasing the address read from the table, and a feed rate value corresponding to the calculated address outputted from the calculation means from the storage means. A second readout means for reading, a pulse generator that generates a pulse with a frequency proportional to the feed speed value read from the storage device, and an address after the calculation outputted from the calculation means are selected in the table. There is provided a feed rate command device characterized in that it has means for readably rewriting the updated address as a renewal address corresponding to the given feed rate command information.

(Function) In the movable object feedrate command device of the numerical control device according to the present invention, an address corresponding to the feedrate command information inputted from the feedrate command information input means such as a tape reader is read from the table, and The address read from is continuously increased or decreased by the calculation means, and the address after calculation output from the calculation means is sent to the table, and the updated address corresponding to the selected feed speed command information in this table is It can be read and rewritten in the table as desired.

On the other hand, the feed speed value read from the storage means is input to the pulse generator, and the pulse generator generates a pulse having a frequency proportional to the feed speed value.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a circuit block diagram for realizing the feed rate command device according to the present invention.

In the figure, 101 is a paper tape on which a processing program is perforated, and the feeding speed is F0, F1,
..., is stored on paper tape by punching F9. Reference numeral 102 denotes a paper tape reader, and 103 an input circuit, which has a buffer and the like for storing the feed speed and the like read from the paper tape.

201 is a memory, which has a large number of addresses Af ₁ ,
Af ₂ , ..., Af ₉ ...A large number of feed speed values are stored corresponding to Af _o . A large number of numerical values are stored for this feed rate value so that it gradually increases as the address increases. 202 is an address register, 203 is a feed speed command F1, F2,..., F9 given from the paper tape 101 and a memory 2.
204 is a _register that stores the address read _from the table ₂₀₃ .

109 is an arithmetic circuit that generates an up pulse UPP or a down pulse by operating an up button or a down button as an operating device on an operation panel (not shown).
Each time a DWP occurs, "1" is added to or subtracted from the address value output from the register 204. That is, it is raised or lowered by one address. Note that the calculation result by the calculation circuit 109 is input to the register 204. 110 is a digital pulse generator, which includes a register 110a, an accumulator 110b, and an adder 110c that adds the contents of the register 110a and the accumulator 110b every time a frequency clock pulse CP is generated, and stores the addition result in the accumulator 110b. have. If the value set in the register 110a is A and the capacity of the accumulator 110b is 2 ⁿ -1 (n-bit register), and the above-mentioned addition is performed by the adder 110c every time a clock pulse CP is generated, the accumulator 110
A carry pulse OVFP is output from b, and its frequency ₀ is given by ₀ = A/(2 ⁿ -1). That is, a carry pulse with a frequency proportional to the value set in register 110a.
OVFP is output.

Next, the operation of the present invention will be explained.

A feed speed command, for example F5, stored on the paper tape 101 is read by the tape reader 102,
The feed rate command F5 is temporarily stored in the input circuit 103. Next, based on this feed speed command F5, the corresponding address _Af50 is read from the table 203 and stored in the register 204. This address is also transferred to the register 202 via the arithmetic circuit 109. When Af ₅₀ is transferred to the address register 202, the value corresponding to the feed speed (1100) is obtained from the address Af ₅₀ in the memory 201.
is read out and register 1 of pulse generator 110
10a, and the pulse generator 110 outputs a pulse OVFP with a frequency proportional to the numerical value (1100). In this state, if the up button is pressed, an up pulse UPP is generated. When the up pulse UPP is generated, the arithmetic circuit 109 adds +1 to the contents of the register 204 and inputs the result of the operation to the register 204 and the address register 202. As a result, the contents of address register 202 are increased by +1, and a numerical value (1150) is read from address (Af ₅₀ +1) and set in register 110a. Now, since this number (1150) is greater than the number (1100) stored at address Af ₅ , the frequency of the output pulses generated from the pulse generator gradually increases. Thereafter, if the up button is continued to be pressed and an up pulse UPP is generated, the value set in the register 110a will gradually increase, the frequency of the output pulse OVFP will also gradually increase, and the circuit of the movable object will rise. When the address stored in the register 204 is stored in the table 203 as a new address Af ₅₁ corresponding to F5 upon release of the up button, completion of pulse distribution, etc., the feed rate adjustment operation is completed. Incidentally, when the down button is pressed, almost the same operation is performed.

In the above embodiments, hardware is provided for each function, but since there are no analog elements, the system can also be configured using a processing device such as a microprocessor.

In addition, we have explained the case where up pulses UPP and down pulses DWP are generated by pressing the up button and down button provided on the operation panel, but the operation panel of the numerical control device also has a jog button for manual feed and manual pulse generation. The jog button and manual pulse generator may be used in place of the up button and down button, and in this way the number of parts can be further reduced.

As above, this invention has been described in some detail with respect to its most preferred embodiment, but the description of the preferred embodiment does not include variations in detailed parts of the configuration or contrary to the spirit of the invention as described in the claims. It is possible to make various modifications or combinations thereof.

(Effects of the Invention) As described above, according to the present invention, (1) the correspondence between the feed rate command and the feed rate value is not fixed;
Since the numerical value in the memory can be changed as necessary or the numerical value in the memory can be shifted in response to the operation of the operating device, the feed rate value can be easily changed. That is, it is possible to easily set the optimum feed rate according to the so-called machining situation, corresponding to the type of workpiece and the machining mode, without depending on the numerical control tape. (2) Programming is extremely easy for numerically controlled tapes, as you only need to give the feed rate command (F1 digit). This is more effective in machining that requires frequent changes in feed speed. (3) Since the operating device for adjusting the feed rate can be used as one set, the number of parts can be reduced, the space for mounting parts can be reduced, costs can be reduced, and the operation can be simplified and erroneous operation can be avoided. can be avoided.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams for explaining the feed rate command system to which the present invention is applied, and FIG. 3 is a circuit block diagram for realizing the feed rate command device according to the present invention. 101...Paper tape, 102...Tape reader, 1
03...Input circuit, 104...Memory, 105...Write control circuit, 106...Read control circuit, 107...
Address register, 108...Register, 109...
Arithmetic circuit, 110...Pulse generator, 110a...Register, 110b...Accumulator, 110c
...Adder, 201...Memory, 202...Address register, 203...Table, 204...Register.

Claims (1)

[Scope of Claims] 1. A movable object feed rate command device of a numerical control device, comprising: feed rate command information input means for inputting feed rate command information; and storing a plurality of pieces of feed rate command information and a plurality of addresses corresponding thereto. a table for storing data, a storage means for storing addresses greater than the number of addresses stored in the table, a plurality of feed speed values corresponding to these addresses, and a feed speed command input from the feed speed command information input means. a first readout means for reading out an address corresponding to information from a table; a calculation means having an increase/decrease means for increasing or decreasing the address read from the table; a second step of reading the feed rate value from the storage means;
a pulse generator that generates a pulse with a frequency proportional to the feed speed value read from the storage device; A feed speed command device comprising: means for readably rewriting speed command information as a renewal address corresponding to the speed command information.