JPH084989B2 - Model processing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a model machining apparatus, and particularly to damage or breakage of a machining tool due to contact between a metal core of a model forming body and the machining tool. The present invention relates to a model processing device that can be prevented.

(Prior art and its problems) In the product development stage of automobiles and the like, models are often manufactured as part of the planning, designing, and designing process. Among them, automobiles are the typical ones, whose style is a major factor in product evaluation, and the quality of the design greatly affects the product appeal.

For this reason, in vehicle design, when the entire body shape is designed in the design process, the designer's image is actually embodied in a three-dimensional solid and the styling of the body is visually confirmed and confirmed. Based on the manufactured model shape, a design model is manufactured as a means for redesigning, modifying or changing the design.

In order to manufacture this vehicle design model, mechanization has been introduced, and a model processing device using an automatic processing machine, in particular, a numerically controlled (NC) processing machine is used. In this type of model processing apparatus, a mould-like body in which a covering material is formed on a base body in which a core material is assembled in a basket shape is prepared as a model forming body, and the model forming body is set in the processing apparatus, and the model forming body is set. The coating material on the surface is cut by the processing tool of the processing machine and the body shape is automatically cut out. The model production using such a processing device is superior in efficiency to the conventional production by a modeler, and it is possible to meet the necessity of shortening the period and labor saving by mechanization of the design process.

However, in the conventional device, for example, in the case where the machining tool cuts too much the coating material of the upper layer of the model forming body and hits the core material below it, when metal is used as the core material, the tool is It causes damage to the blade. As mentioned above, the design model grasps the image of the designer drawn in the design diagram, etc. in an actual three-dimensional manner, so it is possible to express the image more accurately 1/1 scale, that is, the actual size May be produced in. In such a case, since a steel frame is used as the backup material as the core material for the reason of maintaining the shape or supporting the covering material to be coated with a predetermined thickness, contact with the steel frame causes breakage of the blade. In particular, when utilizing the advantages of automation to process and manufacture models throughout the day and night, the device may be operated unattended. In such a case,
Even if a manual emergency stop device is provided, operation is not stopped because people do not monitor it, and operation is continued even if the backup material comes into contact with the processing tool as described above. As a result, there is a great possibility that the blade of the tool of the processing machine may be broken or the arm may be bent, which requires time and labor for repairing, and also increases the manufacturing cost.

(Object of the invention) The present invention has been made in view of the above circumstances, and a processing tool of a processing device that cuts a workpiece to be processed on a metal core material of a model forming body hits the metal core material. An object of the present invention is to provide a model machining apparatus having an automatic stopping mechanism that prevents damage to the blade of a tool and replacement of related members even when it occurs.

(Means for Solving Problems) In order to achieve the above object, the present invention is a model forming body formed by forming a non-conductive coating material on a base body in which a metal core material is assembled in a cage shape. In a model processing apparatus for automatically cutting the coating material to be processed on the surface of the model forming body by an interchangeable processing tool that is rotationally driven, an arm portion that guides a mounting portion of the processing tool. , On the rotation surface of the mounting portion of the machining tool for detecting conduction caused by contact between the arm member and the core member of the model forming body when the machining tool is rotationally driven. And a stopping means for automatically stopping the driving of the working system of the machining tool when the machining tool and the core material come into contact with each other by energization with the conduction detection section being grounded. It is the one.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a system conceptual diagram of a model production process using an automobile design model processing apparatus according to an embodiment of the present invention.

This system uses an NC milling machine as a model processing machine, and basically, programming and data input are performed in the same work as when processing a workpiece using an NC machine tool. . That is, based on the vehicle design diagram 1 etc., the information necessary for operating the NC processing machine, such as the body shape, dimensions, and processing sequence, was entered.
Create an NC tape 2 and use this NC tape 2 as the control unit body 3
The tape reader 4 is used to read numerical information.

The information on the NC tape 2 is given from the tape reader 4 to the microcomputer 6 via the interface circuit 5 and decoded. The microcomputer 6 performs a predetermined calculation and sends the result to the servo unit 7 via the interface circuit 5, and the servo motor of the NC processing machine body 8 is driven by a command from the servo unit 7.

As shown in FIG. 1, the NC processing machine main body 8 is of a gate type and is of a large size in which an actual size model forming body (workpiece) 9 can be set. There is. The position, rotation speed, etc. of the cutter 10 of the NC processing machine body 8 are controlled on the basis of the operation command from the servo unit 7, and thereby the model forming body 9 is cut as instructed.

As shown in FIG. 2, the actual size model forming body 9 is composed of a steel frame 9a as a backup material and a covering material forming a surface layer. In this embodiment, a cutter 10 is used as the covering material. Resin 9b that can be cut by and is non-conductive
Is used. The model forming body 9 to be cut by the cutter 10 is manufactured and prepared in advance as follows.

First, according to the shape and dimension values of the body set in the design diagram 1 etc., make a shape up to a certain degree,
A steel frame 9a is assembled in a basket shape to form a base body having an approximate body shape. When manufacturing the base made of the steel frame 9a, the cage base is made slightly smaller than the surface of the body to be processed in consideration of the thickness when the resin 9b is attached to the outer side of the base. After manufacturing such a substrate, as shown in FIG. 2, a resin 9b is formed on the substrate with a predetermined thickness (for example, 30 mm to 40 mm).
To form a surface coating layer.

The pawl-shaped model forming body 9 thus obtained is set at a fixed position of the NC processing machine body 8 as shown in FIG.

The cutting section 11 of the NC processing machine 8 is configured as shown in FIG. 3, while the setting section 12 is configured as shown in FIG. 4, and the steel frame 9a of the model forming body 9 will be described later. It is electrically connected to the emergency stop device.

As shown in FIG. 3, the resin on the surface of the model forming body 9
In the illustrated example, the cutting section 11 for cutting 9b has a structure including an automatic tool changer (ACT device). The cutting section 11 includes a cutter 10 as a processing tool,
It has a chuck 13 for mounting and holding the cutter 10, and an arm 14 for guiding the chuck 13. The cutter 10 and the chuck 13 are integrally driven to rotate, and these are a drive mechanism 15 including a motor that operates according to an operation command from the servo unit 7 of the control device body 3 shown in FIG. The rotation speed, position, etc. are controlled by.

The chuck 13 which is rotationally driven holds the cutter 10 and is electrically connected to the cutter 10. Further, a continuity detection unit 16 is provided which is in contact with the rotating surface 13a of the chuck 13 and electrically contacts therewith. Has been. In this embodiment, the continuity detecting unit 16 is configured by using the arm 14. That is, one end of the metal arm 14 has a chuck
A cylindrical portion 16a extending toward the rotation surface 13a of 13 is formed, and a stopper 16b is provided on the base end side thereof,
A metal ball 16c is rotatably mounted on the tip side. The ball 16c is urged by a spring 16d inserted inside the tubular portion 16a and is constantly pressed against the rotating surface 13a of the chuck 13.

In this way, the arm 14 is configured as a conducting arm and is connected to the ground via the machine body, so that the cutter 10 can be rotated by the chuck 1 even in the rotating state.
3, ground potential via ball 16c.

On the other hand, the model forming body 9 which is cut by the cutter 10 is, as shown in FIG. 4, an NC processing machine main body 8 via an insulating layer 18 for insulation formed on a surface plate 17, for example, resin.
Is set to Therefore, the model forming body 9 is insulated from the surface plate 17 of the NC processing machine body 8 even if the base body is made of the metal steel frame 9a.

As shown in FIG. 3, a lead wire 19 is connected to the steel frame 9a of the model forming body 9 which is set so as to be floated from the ground as described above, and the lead wire 19 is connected to the terminal 20a of the emergency stop device 20. It is connected to the. Emergency stop device 2
0 has a relay circuit 21 and coil 2 of this relay circuit 21
1a is inserted between the terminal 20a and one power supply terminal 22a of the operating power supply (for example, AC power supply of 8V AC), and the other power supply terminal 22b is connected to the ground through the terminal 20b of the emergency stop device 20. ing.

The normally closed contact 21b of the relay circuit 21 is inserted in the power path of the drive mechanism 15 through the terminals 20c and 20d of the emergency stop device 20. The drive mechanism 15 is composed of, for example, a DC servo motor, a position detector, and the like, and is connected to the power source from the terminals 23a and 23b via the main switch and the like. The normally-closed contact 21b of the relay circuit 20 is closed when the coil 21a is in a non-excited state to enable power supply to the drive mechanism 15, and when the coil 21a is excited by energization, the power supply path is closed. It opens, and the motor of the cutter operating system is turned off to stop the operation.

Further, in the present embodiment, this NC emergency stop device is an automatic and manual emergency stop device, and is provided with an emergency stop button 24 that is manually operated by a worker when an abnormality occurs during operation of the NC processing machine. The emergency stop button 24 is located on the operation panel surface of the NC processing machine.
The NC processing machine can be manually stopped by opening 24a.

Therefore, the model processing apparatus configured as described above can perform both emergency stop and temporary stop.

Next, the production of a model by the model processing apparatus having the above-described configuration and the automatic emergency stop at the time of contact between the cutter 10 and the steel frame 9a will be described with reference to FIG.

First, in the production of a model, as described above, the previously prepared model forming body 9 as shown in FIG. 2 is set on the insulating layer 18 on the surface plate 17 of the NC processing machine body 8, Perform predetermined work such as reference positioning during NC cutting. Then, the automatic cutting process based on the programmed NC tape 2 is started.

During the cutting process, the cutter 10 executes the process according to the command by the numerical control, cuts the resin 9b of the model forming body 9 as shown in FIG. 5 (A), and the body shape according to the instruction. The surface 9c is carved out. When the cutting process is normally performed, the rotating cutter 10, which is electrically connected to the ground through the continuity detecting unit 16 and the chuck 13, shows the metal of the model forming body 9 as shown in FIG. No contact with the steel frame 9a, and the resin 9b on the surface to be cut is a non-conducting material. Further, as shown in FIG. 4, the model forming body 9 as a whole is insulated from the surface plate 17. , No current flows through the coil 21a of the relay circuit 21 to which AC 8V is applied, and the coil 21a
Is in a non-excited state. For this reason, normally closed contacts
21b maintains the closed state, and the power supply to the drive mechanism 15 is not interrupted by the normally closed contact 21b. Therefore, the cutting by the cutter 10 described above proceeds as usual.

On the other hand, as shown in FIG. 5 (B), the cutter 10 scrapes the resin 9b of the model forming body 9 too deeply and the steel frame 9a
In such a case, when the cutter 10 and the steel frame 9a come into contact with each other, the NC processing machine is emergency stopped, and the cutter operating system motor is turned off to prevent the cutter 10 from being damaged. That is, if the cutter 10 touches the steel frame 9a, the power terminal
22a-Coil 21a of the relay circuit 21-Lead wire 19-Steel frame 9a of the model forming body 9-Cutter 10-Chuck 13-Conduction detection unit 16
A closed circuit composed of a conducting arm and ground is formed, and by energizing the coil 21a, the normally closed contact 21b is opened, and the power supply to the drive mechanism 15 is cut off. As a result, the operation of the cutter 10 is stopped, and it is possible to prevent the blade of the cutter 10 from being broken.

In this embodiment, since the chuck 13 that is a cutter mounting portion that rotates integrally with the cutter 10 is electrically connected to the cutter 10, the above-mentioned emergency stop is surely performed even while the cutter 10 is rotating. You can do it.

Generally, in this type of NC processing machine, the installed machining tool is in contact with the machine body side via the drive system, and therefore, the inventors have conducted the continuity detection unit 16 as shown in FIG. Without adding specially, the circuit configuration shown in FIG. 3 is used to perform the emergency stop when the machining tool and the metal backup material of the model forming body set in the insulating state as shown in FIG. I tried and experimented. In this experiment, when the NC processing machine was in a stopped state in which the processing tool was not rotationally driven, switch operation was obtained by contact between the two, and it was possible to energize the coil 21a, but in the rotating state of the processing tool, Even if the processing tool comes into contact with the metal backup material, there is no continuity,
The result was that the emergency stop device 20 did not operate.

This is because grease etc. is used in the rotary drive system of the processing tool, and the rotation of the processing tool cuts the electrical connection between the rotating processing tool itself and the machine body due to, for example, the core shaft grease coating, and insulation This is caused by the fact that the machine body is floated from the ground of the machine body, etc. Therefore, with the method of directly using the machine body as a current-carrying path, the emergency stop during the rotation of the machining tool becomes unstable.

On the other hand, according to the configuration in which the continuity detecting unit 16 is provided as shown in FIG. 3, continuity can be established even with the rotating cutter 10, so that the cutter 10 contacts the steel frame 9a. For example, as mentioned above, make sure to activate the emergency stop device 20,
The operation can be stopped. According to the experiment, in the device of the present embodiment, when the cutter rotation is 4000 rpm or more, when the cutter 10 hits the steel frame 9a, the cutter 10 moves from the contact position to the Z direction (Fig. 5 (B)) 2 /. It stopped when it moved 100 mm. As described above, in the case of this embodiment, the reliability of the emergency stop can be improved in the cutter rotating state.

In addition, in this embodiment, the ball 16c is used as the continuity detection unit 16.
Since the configuration is used, there is little problem such as abrasion of the continuity detecting unit 16 in establishing continuity with the cutter unit that rotates at high speed, and stable use is possible for a long period of time. In addition, since the continuity detection unit 16 is provided by using a part of the arm 4, the continuity detection unit can be easily attached to an NC processing machine equipped with an ATC device. It is also possible to avoid obstacles in terms of integration.

As described above, since an emergency stop can be performed when the cutter 10 and the steel frame 9a are in contact with each other, damage to the cutter 10 and the like can be prevented,
When applied to an NC machining device for an automobile design model, it is also effective in the following aspects.

That is, when making a car design model,
It has complicated shapes and dimensions such as planes and curved surfaces, and it spans multiple branches. The information such as the body shape obtained from the design diagram 1 etc. is digitized and the NC processing machine is operated based on this. Therefore, if there is an error in the input process for the size, shape, etc. during the programming work for creating the NC tape 2, the cutter 10 will be driven according to the command, and as a result, the cutter 10 will also operate as shown in FIG. The contact between the cutter 10 and the steel frame 9a occurs as shown in FIG. Therefore, when the above-mentioned automatic emergency stop is performed, it is possible to determine whether or not there is an error in data input by checking the relevant part of the program at that time. In particular, the body shape data used in the model production in the design process can be constructed not only in its own process but also in other processes, for example, the design and processing of the body structure which is the subsequent process, if this is constructed as a database in the computer. Even in such cases, the data can be extracted and used in various forms as the body shape database if necessary.
As described above, it becomes possible to find data mistakes, which can be useful for data correction.

In the above embodiment, the continuity detection unit 16 is configured to use the ball 16c, and the configuration example in which the ATC device is added is shown, but the present invention is not limited to this. For example, instead of the balls 16c, a conductive member such as carbon may be brought into contact with the rotating surface of the cutter mounting portion to establish conduction, and in the case of a processing machine in which the ATC device is not mounted, the cutter mounting portion A continuity detection unit may be attached to the machine body in the vicinity to establish continuity with the rotating cutter.

(Effect of the invention) According to the present invention, a model forming body is used in which a non-conductive coating material is formed on a base body in which a metal core material is assembled in a cage shape, and the surface of the model forming body is used. In a processing device of a model for automatically cutting the coating material to be processed by an exchangeable processing tool that is rotationally driven, an arm portion that guides a mounting portion of the processing tool, and the arm portion, A continuity detection unit that is brought into contact with the rotating surface of the mounting portion of the machining tool to detect conduction due to contact between the machining tool and the core member of the model forming body while the machining tool is rotationally driven. Since the machining tool is provided with a stopping means for automatically stopping the driving of the working system of the machining tool when the machining tool and the core material come into contact with each other by energizing the conduction detecting portion to be grounded, the machining tool contacts the core material. When you do, be sure to respond accordingly It is possible to stop the driving of the working tool and prevent damage to the working tool and damage to other related members.

In addition, since the conduction detecting portion is provided on the arm portion that guides the exchangeable machining tool mounting portion and the conduction detecting portion is brought into contact with the rotating surface of the machining tool mounting portion to energize, the machining tool is moved from the arm portion. It is possible to easily perform maintenance of the contact surface such as removal, cleaning of the continuity detecting portion provided on the arm portion, and mounting portion of the processing tool. Furthermore, since the continuity detecting unit is connected to the ground, an extra current does not flow during tool replacement and maintenance of the contact surface, and thus work can be performed safely.

[Brief description of drawings]

FIG. 1 is a system conceptual diagram of a model production process using a model machining apparatus according to an embodiment of the present invention, and FIG. 2 shows an example of a model forming body for producing a design model of an automobile applicable to the present invention. FIG. 3 is a perspective view, FIG. 3 is a configuration diagram of an emergency stop control circuit system including a concrete example of a cutting portion of an NC processing machine, and FIG. 4 is a cross-sectional view of a main portion showing a configuration of a setting portion of the NC processing machine. FIGS. 5 (A) and 5 (B) are mode diagrams for explaining the operation of the embodiment apparatus during normal processing and during contact between the cutter and the steel frame. 3 ... Control device body, 8 ... NC processing machine body, 9 ... Model forming body, 9a ... Steel frame, 9b ... Resin, 10 ... Cutter, 13
…… Chuck, 13a …… Rotating surface, 15 …… Drive mechanism, 16…
… Continuity detector, 16c …… Ball, 18 …… Insulation layer, 20 ……
Emergency stop device, 21 …… Relay circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeo Ito Inventor Takeo Ito 1-4-1, Chuo, Wako-shi, Saitama Inside of Honda R & D Co., Ltd. (56) Reference JP-A-56-15952 (JP, A) 61-205715 (JP, U) Actual public 62-889 (JP, Y2)

Claims (2)

[Claims] 1. A model forming body, comprising a non-conductive coating material to be processed formed on a base body in which a metal core material is assembled in a basket shape, and the coating material to be processed on the surface of the model forming body is used. In a machining device of a model that automatically cuts by means of an interchangeable machining tool that is rotationally driven, an arm portion that guides the mounting portion of the machining tool, and the machining tool that is provided on the arm portion and that rotationally drives the machining tool. A contact detection unit that is brought into contact with the rotating surface of the mounting portion of the machining tool when contacting the core member of the model forming body in order to detect the contact due to the contact between the core member and the core member; A model machining apparatus comprising: a stopping unit that automatically stops driving of an operating system of the machining tool when the machining tool and a core material come into contact with each other by energization to be grounded. 2. The model machining apparatus according to claim 1, wherein the continuity detecting section includes a metal ball which is brought into pressure contact with a rotating surface of a mounting section of the machining tool.