JPH0751987A - Interactive type numerical control device - Google Patents

Abstract

PURPOSE:To simplify production of an NC processing program by providing a means which is operated to automatically select a drill having size suitable for machining of a prepared hole in a recessed processing shape from a tool file and automatically produce a processing program according to which a drilling work for a proper depth is carried out in the order of a nominal diame ter. CONSTITUTION:In each drill picked up by a picking up means for a drill for processing a prepared hole, a sink depth at which the inside diameter of a recessed machining shape is caused to coincide with the nominal diameter of a drill is determined by a processing depth calculating means 31. Further, in a drill with a maximum nominal diameter having diameter lower than a minimum inside diameter, the maximum processing depth in a recessed processing shape is determined as a sink depth. A prepared hole processing program producing means 31 is caused to automatically produce a processing program, according to which drilling processing down to the sink depth of each of drills, detected by a drill picking-up means for processing a prepared hole, in the order of a nominal diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of an interactive numerical control device.

[0002]

2. Description of the Related Art An interactive numerical control device for automatically creating an NC machining program required for machining in response to a shape input is already known. In addition, in the case of finishing the recessed shape by performing boring processing with an NC lathe or die-cutting processing with an NC electric discharge machine, in order to improve processing efficiency and prevent electrode wear, It is desirable to pre-drill a prepared hole in the recessed shape. Therefore, even when a series of NC machining programs are created by the interactive numerical control device, a function of automatically creating a machining program for prepared hole machining is strongly desired.

[0003]

As an interactive numerical controller for automatically creating a machining program for preparing a pilot hole,
A drill with a nominal diameter slightly smaller than the minimum inner diameter of the recessed shape is automatically selected, and this drill automatically creates a machining program that allows hole drilling up to the maximum machining depth of the recessed shape. Things have already been proposed. However, when the recessed shape has a tapered diameter, especially when the taper is steep or the processing depth is deep, even if the prepared hole finishes, Many left-over parts remain, which causes a problem that time is required for finishing work such as boring and die-cutting.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, and even if a recessed shape having a steep taper or a deep working depth is inputted, a finish processing is performed according to the shape. It is an object of the present invention to provide an interactive numerical control device capable of accurately creating a prepared hole machining program that can be performed without difficulty in a short time.

[0005]

The interactive numerical control apparatus of the present invention inputs a tool file for storing the nominal diameter of a drill prepared for machining and a concave machining shape for expanding the diameter on the tool insertion side. Prepared hole drilling extraction means for detecting and extracting from the tool file each drill having a nominal diameter that is smaller than the maximum inner diameter of the recessed shape and is greater than or equal to the minimum inner diameter, and the prepared hole drilling extraction means With respect to each of the drills extracted by, the working depth calculation means for obtaining the submersion depth where the inner diameter of the concave working shape matches the nominal diameter of the drill, and the drill detected by the prepared hole drilling extraction means According to the configuration, it is provided with a prepared hole machining program creating means for automatically creating a machining program for performing hole drilling up to the sinking depth of each drill in accordance with the order of the nominal diameter. To achieve the objective.

Further, a drill having a maximum nominal diameter having a diameter smaller than the minimum inner diameter of the recessed shape is also extracted, and a machining program is set for the drill by setting the maximum processing depth of the recessed shape as the sink depth. By creating it, a prepared hole machining program is created so that even if a drill suitable for the concave machining shape is not prepared, finishing machining can be performed in a short time without difficulty.

[0007]

The nominal diameter of the drill prepared for machining is preset and stored in the tool file of the interactive numerical control device.
When the input of the concave machining shape that expands to the tool insertion side is detected by the interactive numerical control device, the interactive numerical control device
The tool file is searched by the drill extracting means for prepared hole processing, and is smaller than the maximum inner diameter of the recessed shape, and
A drill having a nominal diameter equal to or larger than the minimum inner diameter and a drill having a maximum nominal diameter having a diameter smaller than the minimum inner diameter of the recessed shape are extracted. The working depth calculation means, for each extracted drill, obtains the submerged depth in which the inner diameter of the recessed working shape matches the nominal diameter of the drill, and of the maximum nominal diameter having a diameter smaller than the minimum inner diameter. For the drill, the maximum working depth of the recessed shape is determined as the submerged depth. The prepared hole machining program creating means automatically creates a machining program for performing hole making processing up to the depth of each drill in each of the drills detected by the prepared hole drilling extraction means in accordance with the order of nominal diameter. A program for drilling holes.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of essential parts showing the configuration of an interactive numerical control apparatus of an embodiment to which the present invention is applied.

The processor 11 controls the entire interactive numerical controller according to a system program stored in the ROM 12. ROM12 has EPROM or EEPR
OM is used. An SRAM or the like is used as the RAM 13, and various data or input / output signals are stored therein. A CMOS backed up by a battery (not shown) is used for the non-volatile memory 14, and various data once stored are retained as they are even after the power is turned off.

The graphic control circuit 15 converts the digital signal into a signal for display and gives it to the display device 16. As the display device 16, a CRT, a liquid crystal display device, or the like is used. The display device 16 displays a shape, processing conditions, etc. when creating a processing program in an interactive form.

The keyboard 17 is composed of shape element keys, numerical keys, etc., and necessary graphic data, NC data, etc. are input using these keys.

The axis control circuit 18 receives the axis movement command from the processor 11 and outputs the axis command to the servo amplifier 19. The servo amplifier 19 receives the movement command and drives the servo motor of the machine tool 20. These components are coupled to each other by a bus 21.

A PMC (Programmable Machine Controller) 22 receives a T function signal (tool selection command) or the like via the bus 21 when executing an NC program. Then, this signal is processed by the sequence program, a signal is output as an operation command, and the machine tool 20 is controlled.
Further, it receives a status signal from the machine tool 20, performs a sequence process, and transfers a necessary input signal to the processor 11 via the bus 21.

Further, on the bus 21, a software key 23, NC whose function is changed by a system program or the like, is provided.
A serial interface 24 is connected to send data to an external device such as a floppy disk device (FDD), printer or paper tape reader (PTR). The software key 23 is provided on the CRT / MDI panel 25 together with the display device 16 and the keyboard 17.

In addition to the processor 11 which is a CPU for NC, a processor 31 for interaction having a bus 30 is connected to the bus 21. ROM 32 on the bus 30,
The RAM 33 and the non-volatile memory 34 are connected.

The interactive data input screen displayed on the display device 16 is stored in the ROM 32. On this interactive data input screen, information relating to the NC sentence, for example, the overall movement trajectory of the tool is displayed as a background animation when the NC sentence is created.
Further, the work or data that can be set by the input screen is displayed on the display device 16 in a menu format. The item to be selected from the menu is selected by the software key 23 arranged at the bottom of the screen corresponding to the menu. The meaning of the software key 23 changes for each screen. An SRAM or the like is used as the RAM 33, and various data for dialogue are stored therein.

The input data is the processor 3 for dialogue.
1 to process a workpiece machining program. The created program data is sequentially background-animated on the display device 16 used interactively. Further, the work machining program stored as the NC sentence in the non-volatile memory 34 is stored in the machine tool 20.
It is also executed when processing by, and the foreground animation is displayed.

Further, the non-volatile memory 34 is provided with a tool file for rewritably storing the nominal diameter of the drill, and the operator is loaded into a tool changing device of the machine tool 20 such as an NC lathe. The nominal diameter of the existing drill, that is, the nominal diameter of the drill prepared for machining
It is registered in the tool file in advance via the keyboard 17 of the MDI panel 25.

Since the input operation of the machining shape using the shape element keys, the numerical keys and the like and the normal processing program creation processing by the interactive processor 31 are already known, the description thereof will be omitted. The processing operation of the interactive numerical control device when a shape input is detected will be described.

FIG. 2A is a sectional view showing an example of the final finished shape of the recessed shape to be processed. The finishing of this processing is performed by an inner diameter tool of the machine tool 20 such as an NC lathe, and the insertion of the tool into the work is performed from the right side surface of the work in FIG. That is,
The machining shape shown in FIG. 2A is a concave machining shape in which the diameter is expanded on the tool insertion side. The initial shape of the work is a solid block as shown by the contour line in FIG. 2 (a), and the automatic programming function to be described below is the solid work shown in FIG. 2 (a). By performing the pilot hole machining a plurality of times, the machining with the inner diameter tool of the machine tool 20 such as an NC lathe is left, leaving a finishing allowance as shown in FIG. .

FIG. 3 is a flow chart showing an outline of the prepared hole machining program preparation process executed by the processor 31 which detects the input operation of the concave machining shape in which the diameter is expanded to the tool insertion side.

The processor 31, which has detected the input operation of the recessed shape, first reads the minimum inside diameter D1 and the maximum inside diameter D2 of the recessed shape from the input shape data and temporarily stores them (step S1, (a in FIG. 2). )), And also searches the tool file in the non-volatile memory 34 to read the minimum and maximum drill diameters, and register R1 and R2 respectively.
And the value of the register R3 is initialized to 0 (step S2).

Next, the processor 31 compares the maximum inner diameter D2 of the recessed shape with the minimum drill nominal diameter R1 registered in the tool file, and the minimum drill nominal diameter R1 is larger than the maximum inner diameter D2 of the recessed shape. It is determined whether or not it is small (step S3). However, the maximum inner diameter D2 of the recessed shape
If there is no drill with a smaller nominal diameter than
If the result of the determination in step S3 is true, it is impossible to perform the pilot hole machining. Therefore, in this case, as in the conventional case, the processor 31 performs the NC processing for cutting out the concave shape from the solid block as shown in FIG. 2A through all the steps of roughing and finishing with the inner diameter tool. A program is created (step S16), and the creation of the NC machining program for the concave machining shape is completed. The created NC machining program is stored in the non-volatile memory 34. The process of step S3 is a part of the pilot hole drilling extraction means.

On the other hand, when the minimum nominal drill diameter R1 is smaller than the maximum inner diameter D2 of the recessed shape, at least:
It is guaranteed that a single drilling can be performed with a drill having a minimum nominal diameter R1.

Therefore, in this case, the processor 31 determines whether or not the minimum drill nominal diameter R1 is smaller than the minimum inner diameter D1 of the recessed shape (step S4), and the drill nominal diameter R1 is smaller than the minimum inner diameter D1. If smaller, register R3
The drill nominal diameter R1 is stored as an initial value in (step S
5) Further, the tool file in the non-volatile memory 34 is searched to find a drill having the next thickest nominal diameter, and the nominal diameter is updated and stored in the register R1 (step S6). Therefore, the nominal diameter of the drill which is one step smaller than the nominal diameter of the drill stored in the register R1 is always stored in the register R3. Next, the processor 31 determines whether or not the nominal diameter of the drill currently stored in the register R1 has reached the maximum nominal diameter R2 of the drill registered in the tool file (step S7). If not, thereafter, the nominal diameter of the drill read in the register R1 exceeds the minimum inner diameter D1 of the recessed shape (step S4), or the nominal diameter of the drill read in the register R1 is registered in the tool file. Until the maximum drill nominal diameter R2 is reached (Step S
7), similarly to the above, steps S4 to S7
The process of is repeatedly executed. The processing of step S4 is a part of the drill extracting means for prepared hole processing.

When the determination result in step S7 is true, that is, the nominal diameter of the drill read in the register R1 reaches the maximum nominal drill diameter R2 registered in the tool file, and the nominal diameter is reached. If R1 = R2 is smaller than the minimum inner diameter D1 of the recessed shape, time is wasted even if repeated drilling is performed with a drill having a nominal diameter smaller than this, and once with a drill having the maximum drill nominal diameter R2. Only the prepared hole should be processed. For example, if there are 3 mm, 5 mm, and 8 mm drills when the minimum inner diameter D1 of the recessed shape is 10 mm, it is sufficient to finally drill a prepared hole with an 8 mm drill. There is no need to make a pilot hole. In this case, the processor 31 determines the maximum nominal diameter R having a diameter smaller than the minimum inner diameter D1 of the recessed shape.
NC that sinks the 2nd drill to the maximum processing depth of the recessed shape
A machining program is created to be an NC machining program for pilot hole machining (step S8, see (d) of FIG. 2), and
In accordance with the dimension R1 = R2 of the prepared hole, an NC machining program for performing roughing and finishing steps by an inner diameter tool is created as in the conventional case (step S15), and an NC machining program for the concave machining shape is created. Finish the creation. The created NC machining program is stored in the non-volatile memory 34 in the order of creation. Step S8
Is a part of the machining depth calculating means and the prepared hole machining program creating means.

On the other hand, when the minimum nominal drill diameter R1 read in the process of step S2 exceeds the minimum inner diameter D1 of the recessed shape from the beginning, or while the processes of steps S4 to S7 are repeatedly executed. Register R1
If the value of exceeds the value of the minimum inner diameter D1, step S
The determination result of 4 is true. In this case, the processor 31
First, it is determined whether or not the register R3 maintains the initialized state (step S9). If the initial state of the register R3 is maintained at this stage, it means that the minimum drill nominal diameter R1 read in the processing of step S2 has exceeded the minimum inner diameter D1 of the recessed shape from the beginning. The first prepared hole is started from the drill having the minimum nominal diameter R1 (see (b) of FIG. 2). At this stage, if a value other than the initial value 0 is stored in the register R3, the drill having the maximum nominal diameter smaller than the minimum inner diameter D1 of the recessed shape is repeated by repeating the above-described steps S4 to S7. This means that the value has already been stored in the register R3, and that the NC machining program for machining the prepared hole by the drill having the nominal diameter R3 has not been created yet.

Therefore, when a value other than the initial value 0 is stored in the register R3, the processor 31 first uses a drill having a maximum nominal diameter R3 having a diameter smaller than the minimum inner diameter D1 to obtain the maximum machining depth of the concave shape. An NC machining program for sinking is created as the first NC machining program for the pilot hole machining (step S10, see (d) of FIG. 2), and then
It is determined whether or not the nominal diameter of the drill currently read in the register R1 exceeds the maximum inner diameter D2 of the recessed shape (step S11). If the nominal diameter R1 of the drill exceeds the maximum inner diameter D2 of the recessed shape and the result of the determination in step S11 is true, it is impossible to perform prepared hole drilling with a drill having a diameter of R1 or more. The processor 31 creates the N created in the process of step S10.
In accordance with the size R3 of the prepared hole of the C machining program, an NC machining program for carrying out each process of roughing and finishing with an inner diameter tool is created as in the conventional case (step S1.
5) Then, the creation of the NC machining program for the concave machining shape is completed. The created NC machining program is stored in the non-volatile memory 34 in the order of creation. The process of step S10 is a part of the machining depth calculating means and the prepared hole machining program creating means, and the process of step S11 is a part of the prepared hole drilling extracting means.

Further, when the nominal diameter R1 of the drill does not exceed the maximum inner diameter D2 of the recessed shape and the determination result of step S11 is false, and when the nominal diameter R1 of the minimum drill read in the processing of step S2 Has exceeded the minimum inner diameter D1 of the recessed shape from the beginning and the result of the determination in step S9 is true, that is, through the determination processing in steps S3 and S4, the call currently stored in the register. When it is guaranteed that the value of the diameter R1 is included between the minimum inner diameter D1 and the maximum inner diameter D2 of the recessed shape, the processor 31 determines that the diameter of the inner peripheral surface of the recessed shape is the diameter of the drill. Drilling depth T matching the diameter R1
Is calculated (step S12), and the drill with the nominal diameter R1 is T
Create an NC machining program that sinks to the depth of the hole and make it part of the NC machining program for prepared hole machining (step S
13, see FIG. 2 (b)). Since the depth T of the drill is given by the position of the tip of the drill, a certain clearance is secured by the height of the heel ((b) of FIG. 2).
reference). That is, the outer periphery of the drill does not bite into the inner peripheral surface of the recessed shape during machining. The submersion depth of the drill in which the diameter of the inner peripheral surface of the recessed shape matches the nominal diameter R1 of the drill can be obtained from the relationship between the inner diameter D1 or D2 of the recessed shape and the taper gradient and the nominal diameter R1,
Further, even when the shape of the taper is a circular arc changing in the depth direction, it can be obtained according to the function. The process of step S12 is a part of the machining depth calculating means, and the process of step S13 is a part of the prepared hole machining program creating means.

The processor 31, which has created a part of the NC machining program for machining the prepared hole, searches the tool file in the non-volatile memory 34 for the next drill having the thickest nominal diameter, and stores the nominal diameter in the register R1. It is updated and stored (step S14). Hereinafter, until the nominal diameter of the drill currently read in the register R1 exceeds the maximum inner diameter D2 of the recessed shape, the processor 31 repeatedly executes the processing from step S11 to step S14 in the same manner as described above. Select a drill with a larger diameter one by one and create an NC machining program for the prepared hole corresponding to this. Then, when the newly read nominal diameter of the drill exceeds the maximum inner diameter D2 of the recessed shape and the determination result of step S11 becomes true, the processor 31 repeats the series of steps S11 to S14. In accordance with the size of the prepared hole machined by the NC machining program, an NC machining program for carrying out each process of roughing and finishing with an inner diameter tool is created as in the conventional case (step S1.
5) The creation of the NC machining program for the concave machining shape is completed. The created NC machining program is stored in the non-volatile memory 34 in the order of creation.

Therefore, if the diameter of the drill having the maximum nominal diameter among the drills registered in the tool file of the non-volatile memory 34 is smaller than the minimum inner diameter D1 of the concave shape, then the drill registered in the tool file As shown in FIG. 2 (d), the drill having the maximum nominal diameter is used to perform the pilot hole machining only once to reach the maximum machining depth of the concave machining shape (see step S3 to step S8), and the nonvolatile machining. Inner diameter D1 of the concave shape in the tool file of the memory 34
If the following items are not registered and one or more drills included between the minimum inner diameter D1 and the maximum inner diameter D2 are registered, (b) of FIG. 2 or (c) of FIG. As shown in FIG. 5, a single prepared hole or a plurality of prepared holes having different diameters are processed while leaving a constant machining allowance on the inner peripheral surface of the recessed shape (see step S11 to step S14). Furthermore,
If the recessed shape having a minimum inner diameter D1 or less and a plurality of drills included between the minimum inner diameter D1 and the maximum inner diameter D2 are both registered in the tool file of the non-volatile memory 34, (in FIG. As shown in e) and FIG. 2 (f), a fixed hole is formed on the prepared hole up to the maximum machining depth by the drill having the maximum nominal diameter smaller than the minimum inner diameter D1 and the inner peripheral surface of the concave machining shape. A plurality of prepared holes having different diameters left behind are simultaneously processed.

As described above, as one embodiment, all the drills included between the minimum inner diameter D1 and the maximum inner diameter D2 of the recessed shape are selected from those having a small nominal diameter, and an NC machining program for drilling a prepared hole is prepared. The case of creating is explained, but when a large number of drills with similar nominal diameters are prepared, for example, when a large number of drills are prepared with a step width of about 0.5 mm, the minimum inner diameter D1 and the maximum If an attempt is made to process the prepared hole using all the drills included between the inner diameter D2 and the inner diameter D2, the overall processing efficiency may deteriorate.

In such a case, the difference [R1-R3] between the current value of the register R1 and the current value of the register R3 is obtained immediately before the execution of the process of step S12 (the position after the confluence from step S9), Only when this value exceeds the predetermined value d, the processes of steps S12 and S13 are executed similarly to the above-described embodiment, and immediately after the execution of step S13, the value of the register R1 is transferred to the register R3. On the other hand, if the value of [R1-R3] does not exceed the predetermined value d, the processes of steps S12 and S13 and the transfer process are not executed, and step S1 is performed.
It is made to jump to the processing of 4. As a result, only when the difference between the drill diameter for which the NC machining program was selected immediately before and the newly selected drill diameter exceeds the predetermined value d (step size), the newly selected drill diameter is set. An NC machining program for preparing a pilot hole is created.

[0034]

According to the interactive numerical control apparatus of the present invention, a drill having a size suitable for drilling a recessed hole is automatically selected from the tool file, and a hole having an appropriate depth is selected according to the order of the nominal diameters. Since the machining program for performing the machining process is automatically created, even if the concave machining shape has a tapered diameter, it is necessary to leave the minimum necessary machining allowance for the prepared hole machining. It is possible to easily create an NC machining program for performing the above, and it is possible to reduce the labor and time required to create the NC machining program and to improve machining efficiency at the same time.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing the configuration of an interactive numerical control apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a recessed shape and a prepared hole.

FIG. 3 is a flowchart showing an outline of a pilot hole machining program creation process by the interactive numerical control device according to the embodiment.

[Explanation of symbols]

 25 CRT / MDI panel 30 bus 31 processor 32 ROM 33 RAM 34 non-volatile memory

Claims (2)

[Claims] 1. An interactive numerical controller that automatically creates an NC machining program required for machining a shape in response to a shape input, and stores a nominal diameter of a drill prepared for machining. Detects the input of the tool file and the recessed shape that expands to the tool insertion side, and extracts from the tool file each drill having a nominal diameter that is smaller than the maximum inner diameter of the recessed shape and greater than or equal to the minimum inner diameter. For the prepared hole drilling extraction means and for each of the drills extracted by the prepared hole drilling extraction means, a working depth calculation for obtaining a submerged depth at which the inner diameter of the recessed machining shape matches the nominal diameter of the drill Means, and a machining program for performing hole drilling up to the sinking depth of each drill by each of the drills detected by the prepared hole drilling extraction means is automatically created in accordance with the order of nominal diameters. Conversational numerical control apparatus characterized by comprising a lower hole machining program creating means. 2. The prepared hole drilling extracting means also extracts a drill having a maximum nominal diameter having a diameter smaller than the minimum inner diameter of the recessed shape, and the machining depth calculating means for the drill. The interactive numerical control device according to claim 1, wherein the maximum machining depth of the concave machining shape is obtained as a submerged depth.