JPS62287960A - Automatic measurment head exchange device for machine tool - Google Patents

Abstract

PURPOSE:To fully automate a machining process and the measurement thereof by enabling the free mounting and dismounting of a measurement head corresponding to each amplifier or high frequency power source, and a machining head having a high frequency electric motor to and from the main spindle of a machine tool, and by making the connectors of each head freely detachable from machine side connectors. CONSTITUTION:When a workpiece 3 has been machined with a primary tool 1 according to a program, an automatic tool exchanger dismantles the tool 1 from a main spindle 2 and an automatic measurement head exchanger operates according to the output of a measurement instruction signal, thereby mounting a measurement head 4a for a machining part 5 to the main spindle 2 automatically. And a head side connector plug 12 and a machine side connector jack 13 are connected to each other concurrently with the mounting of a base 6 as part of said head 4a to the main spindle 2, and a predetermined circuit selector switch 15a is closed, thereby completing the electric system of a corresponding amplifier 16a. Then, the machining part 5 is measured with the head 4a, and a signal therefrom is amplified in the course of running through sakd electric system and inputted to CPU.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is a machine tool equipped with an automatic tool changer and equipped with a numerical control (hereinafter referred to as NC). This invention relates to an automatic measurement head exchange device for a machine tool that automatically measures measurements.

[Prior Art] A general NC machine tool equipped with an automatic tool changer automatically selects a large number of tools stored in a tool magazine according to a preprogrammed procedure, and then selects the main axis of the machine tool. After attaching the selected tool to the workpiece, various processes such as drilling, cutting and polishing are automatically performed on the workpiece. Although extremely high machining accuracy is required for this type of machine tool, it is difficult to maintain constant machining accuracy due to spindle center runout, tool mounting brackets, and tool wear.

As a countermeasure for this, after machining the workpiece, it is necessary to measure the machining dimensions of the machining location, and then replace the tool or rework the workpiece.
Publication No. 58 discloses a contact detection tool that improves the machining degree by bringing a gauge head into contact with or inserting a gauge head into the machining location of a workpiece, and controlling the tool replacement and re-machining process based on detection signals from the gauge head. is disclosed.

In other words, this contact detection tool is mainly used to maintain the ability to center the spindle of a machine tool, and has a shank portion fitted to the spindle at one end and a contact portion at the other end. A tool body, a ring-shaped holder supported on the tool body through a bearing so as to be relatively rotatable about the central axis of the tool body, and a ring-shaped holder provided around the tool body to surround the tool body. A detection coil having a toroidal shape, an electrical connection means for removably connecting the detection coil on the holder to an external power supply, and a member of the fixing part connected to the attachment and detachment of the tool body sealed to the main shaft. It is comprised of a separate locking mechanism that locks the holding body to either the fixing part or the tool body when released.

In addition, this contact detection tool can be inserted into the main shaft of a machine tool, and
Even when performing centering while rotating the tool body, the detection coil and external power supply can be electrically connected without using a slip ring, making it easy to use in general-purpose machine tools. ing.

[Problem to be solved by the invention 1 As described above, as the automation of machining processes progresses, it becomes difficult for workers to measure measurements, and automatic measurement immediately after machining becomes necessary, and high-precision measurements corresponding to various machining contents are required. be done. However, in the case of the above-mentioned known example, although it is suitable for centering processing, etc., it is difficult to measure the absolute dimensions of the machined part of the workpiece, and it is difficult to measure the absolute dimensions of the machined part of the workpiece. When a large number of different types of processing are performed on a workpiece,
Or, if different dimensions are processed for each workpiece, measurement takes too much time.

Therefore, it is unsuitable for high-mix, low-volume production in which a large number of workpieces must be processed and measured in a short period of time.

Furthermore, it cannot be used for anything other than centering processing, such as forming grinding processing in which a high-frequency electric motor is used as a power source to rotate a grindstone at high speed to grind the surface of a workpiece.

[Object of the Invention] The present invention has been made in view of the above circumstances, and it can be done in an extremely short time even when a large number of different types of processing are performed on one workpiece, or when processing different dimensions for each workpiece. By making it possible to measure each processed part within a short period of time, it is suitable for high-mix, low-volume production, and by selectively using measurement gauges suitable for various types of processing, high-precision measurement is possible. The object of the present invention is to provide an automatic measuring head changing device for a machine tool that can easily use a grindstone head equipped with a high-frequency electric motor.

[Means for Solving the Problems] The automatic measuring head changing device for a machine tool according to the present invention has connectors connected to a predetermined amplifier or high-frequency power source arranged in parallel on the main body side of an NC machine tool equipped with an automatic tool changing device. In addition, the measurement head and high-frequency motor-equipped grinding head corresponding to each of the above amplifiers or high-frequency power sources can be attached to and removed from the main shaft of the machine tool, and the connectors connected to each of the above heads can be connected to and separated from the connector on the main body side. It was made freely possible.

[Embodiment 1 of the invention Hereinafter, the present invention will be described in detail with reference to the drawings.

The drawings relate to one embodiment of the present invention, and FIG. 1 is a schematic front view of the NC machine tool, FIG. 2 is a partial cross-sectional view of the main part of the same, FIG. 3 is an electrical wiring system diagram of the main part of the same, and FIG. The figure is a partially sectional side view of the connector.

In these figures, numeral 1 is a machine tool with NC,
An automatic tool changer (
(not shown), so that the workpiece 3 can be machined according to a preset program. (Since this automatic tool changing means and the like are the same as those known in the art, a detailed explanation thereof will be omitted.) In addition, an automatic measuring head changing device (not shown) is attached to the main spindle 2, similar to the above tool. A large number of measuring heads 4 are stored in the magazine tool in advance and can be removed and replaced.

As shown in FIG. 2, the rear part of the measuring head 4, which can be freely engaged with and detached from the processed part 5 of the workpiece 3, is connected to the main @ 2 and the base 6, which is detachable, via a spring 7. The measurement heads 4 are supported so as to be movable forward and backward, and are either stored integrally with the base 6 in a magazine tool (not shown) or attached to the main shaft 2.

Roughly speaking, the base 6 has a guide pin 10 which is detachable from the guide pin 17 disposed on the machine body 8 of the NG machine compensation 1, and a lead wire 11 to the measuring head 4. Head side connector plug 1 connected through
The connector plug 12 is attached to a bracket 23 fixed to the base 6.

On the other hand, on the machine main body 8 side, the main shaft 2 is provided, and the main body side connector 2 is detachable from the head side connector plug 12. Tsuk 13 is bracket 24
The connectors 12 and 13 are fixedly connected through the connectors 12 and 13 so that both connectors 12 and 13 are connected simultaneously when the measurement head 4 is attached.

Of course, each of the connectors 12 and 13 may be a well-known cable connector, and their arrangement may be in a conventional manner as long as it does not interfere with the above functions.

In addition, when connecting the measurement head 4 and the main shaft 2, the guide pin 10 is connected to the connection guide of both and both connectors 12.
．． This is to protect 13 from unnecessary force being applied to it.

The above configuration applies to each of the other measurement heads 4 (4a, 4b, 4c).
), and any arbitrarily selected head can be attached and detached in the same way.

Further, as shown in FIG. 3, the other end of the lead wire 14 connected to the main body side connector jack 13 is connected to a circuit selection opening/closing circuit provided corresponding to each of the measurement heads 48.4b, 4c, . . . Vessels 15a, 15b.

15c..., and amplifiers 16a, 16b, 16c for amplifying measurement signals are connected in series for each circuit selection switch 15a, 15b, 15c....

In addition, each output of each of the amplifiers 16a, 16b, 16cm, etc. is input connected to a CPLI (not shown), and a dimension correction command signal 17 and a TL measurement data calculation processing signal 18 are obtained in response to each signal. , and accordingly controls the drive of the automatic measurement head exchanger, a separate automatic tool changer, or the machine tool body, and controls the drive of the other measurement head 4.
Alternatively, the tool may be replaced with a tool, processing may be continued, or an end operation may be performed.

Furthermore, if necessary, a high frequency electric motor 20 having a grinding wheel head 19 attached thereto is attached to the base 6 instead of the measuring head 4.
The measuring heads 4a, 4b can be attached to and detached from the main shaft 2 in the same way as the measurement heads 4a, 4b, and the connector 13 on the main body side is connected in parallel with the amplifiers 16a, 16b, 16c, etc. for high frequency power supply. By connecting the switch 21 and connecting a predetermined high frequency power source 22 in series with it, the high frequency power source 22 is connected to the high frequency motor 20 at the same time as it is attached to the main shaft 2.
is applied to

Next, the operation of the embodiment will be explained based on the above configuration.

Now, when machining of the workpiece 3 is completed using the first tool ("Z" in the figure) according to the program input in advance, the automatic tool changer is activated by the completion signal and the tool is removed from the spindle 2. The measurement command signal is output, and the automatic measurement head exchange device operates to adapt the measurement head 4 to the processing section 5.
a is selected and automatically mounted on the spindle 2.

Then, the base 6 integrated with the measurement head 4a is attached to the main shaft 2, and at the same time the head side connector plug 12
and the main body side connector jack 13 are connected, and a predetermined circuit selection switch 15a is closed, completing the connection of the corresponding electric circuit system of the amplifier 16a.

Next, the measuring head 4a measures the processing portion 5, for example, detects the diameter and depth of the bored hole, and the measured value signal flows through the electrical system, is amplified, and is input to the CPtJ. Here, if the measurement result is that the machining is insufficient, a dimension correction command signal is output, the measurement head 4a and the tool are automatically replaced again, and the predetermined lead is remachined. Further, if the measurement result is an appropriate value, the machining using the first tool is completed.

Next, the measuring head 4a is replaced with a second tool, and the same workpiece 3 or another workpiece is machined with different dimensions.

Of course, when this is completed, it is replaced with the second measurement head 4b, and its measurement signal is amplified by a predetermined amplifier 16b and output.

By repeating this sequentially, a single workpiece 3 is created.
Alternatively, even if different machining is performed for different workpieces, the tool and 51-measurement head adapted to each machining content are automatically replaced each time, and the first machining → first measurement → second machining (or correction machining) → Different types of machining or measurement processes such as second measurement can be processed completely automatically and efficiently.

In addition, when using one grinding wheel head, the base 6 having the high frequency electric power 1fi20 is automatically replaced with another measuring head 4 or tool by a predetermined operation, and high frequency power is also applied at the same time. Grinding of the workpiece 3 is automatically performed.

Note that the present invention is not limited to the above-mentioned embodiments. For example, if a measurement head 4 for a grinding sensor is prepared in advance, the roughness, dimensions, etc. of the ground surface can be automatically measured.

[Effects of the Invention] As explained above, according to the present invention, the measurement head is automatically attached to the main shaft of the machine tool body, and at the same time, the measurement signal amplification output circuit system corresponding to this measurement head is opened, so that the tool Processing and measurement of workpieces can be performed fully automatically. Therefore, it is possible to efficiently perform high-precision machining without relying on the skill level or intuition of workers, making it suitable for high-mix, low-volume production of items that require high quality.Furthermore, when adding a measuring head or circuit system, the connector on the main body can be used. Since it is simple and requires only a single piece of wire, it can be easily and easily used for conventional machine tools, and is also highly reliable. It has an extremely versatile effect that can be used.

[Brief explanation of the drawing]

The drawings show an embodiment of a machine tool with an automatic measuring head exchange device according to the present invention, and FIG. 1 is a schematic front view of the same machine tool, and FIG.
The figure is a longitudinal cross-sectional view of the main part of the same, FIG. 3 is an electric system circuit diagram of the main part of the same, and FIG. 4 is a partially sectional side view of the connector. 2...Spindle (of the machine tool) 3...Workpiece 4...Measuring head 6...
Base 8...Machine tool body 12...Head side connector 13...Body side connector 15...Circuit selection switch 16...Amplifier Fig. 1 Fig. 2

Claims (1)

[Claims] A plurality of measurement heads that can be selectively attached to and detached from the main shaft of the machine tool body by an automatic tool changer are each provided with a head-side connector for outputting a measurement signal of the workpiece processing part, is provided with a main body side connector that can be connected to the head side connector when the measurement head is installed, and a circuit selection switch and a measurement signal amplification amplifier corresponding to each of the measurement heads are connected in series to this main body side connector. An automatic measurement head exchange device for a machine tool, characterized in that it is connected to.