JPH11254385A - Machining device, and method for machining foamed resin member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately machine a foamed resin member by reciprocating a tool by a specified amount in a direction orthogonal to the center axis of the tool, advancing the tool in the direction of the center axis, and then moving the same in the direction of the center axis in a zigzag manner. SOLUTION: A tool 1 is moved to a specified position and, for first cutting the plane surface of a foaming styrene 2, the tool 1 is lowered along a tool track while moving in a zigzag manner by the operation control of a machining device. By moving the tool 1 in such a manner, air gaps are formed around the tool 1, and thus cut dusts are easily scattered to the outside, and a contact surface between the foaming styrene 2 and the tool 2 is reduced. Thus, the melting of the necessary part of the foaming styrene 2 caused by heat is prevented. Also, a foamed resin member is highly accurately machined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing apparatus and a method for processing a foamed resin member. For example, the present invention relates to a numerical control processing apparatus and a processing apparatus for processing a foamed resin member used in the production of a casting mold, and a method for processing the foamed resin member. Related to processing method.

[0002]

2. Description of the Related Art Heretofore, in manufacturing a casting mold, a so-called full mold method has been widely used, in which a cast model made of a foamed resin member such as styrene foam is used as an intermediate of a mold.

In general, in the full mold method, a so-called numerical control (NC) processing apparatus is equipped with a tool 1 which is a kind of ball end mill having an outer shape as shown in FIG.
While rotating the tool 1, a shape of a mold to be manufactured by casting is cut out from a foam resin member having a certain size.

[0004]

However, in the above-mentioned conventional example, when the tool 1 is moved to a predetermined position and the plane surface of the styrofoam 2 is first cut out, the tool 1 is moved as shown in FIG. Move linearly in the vertical direction. At this time, if the moving speed of the tool 1 is too fast,
When the Styrofoam 2 is crushed at the tip of the tool 1 or the chips generate heat due to the rotation of the tool 1, and the required portion of the Styrofoam 2 is melted by the heat, and the processing accuracy of the portion is deteriorated There is.
If the moving speed of the tool 1 is too slow, the side portion of the tool 1 generates heat due to the rotation of the tool 1, and this heat causes a necessary portion of the styrene foam 2 to melt, which also deteriorates the processing accuracy of the portion. There are cases.

Accordingly, an object of the present invention is to provide a processing apparatus for processing a foamed resin member with high precision and a method for processing the foamed resin member.

[0006]

To achieve the above object, a processing apparatus according to the present invention has the following features.

More specifically, a first aspect of the present invention is a processing apparatus having a control means for cutting a foamed resin member into a predetermined shape by rotating and moving a tool, wherein the control means cuts the foamed resin member. When machining, the tool is reciprocated by a predetermined amount in a direction orthogonal to the center axis of the tool, and the tool is moved in a zigzag manner by being advanced in the direction of the center axis. Thereby, the foamed resin member is prevented from being crushed or heated by the voids obtained by the zigzag operation of the tool, and the discharge of the swarf is promoted.

Alternatively, to achieve the above object, a processing method according to the present invention has the following features.

That is, a fourth aspect of the present invention is a processing method for cutting a foamed resin member into a predetermined shape by rotating and moving a tool, and reciprocating a predetermined amount in a direction orthogonal to a center axis of the tool. The tool is moved in a zigzag manner by moving the tool and moving it forward in the direction of the central axis. Thereby, the foam formed by the zigzag operation of the tool prevents the foamed resin member from crushing and generating heat, thereby facilitating the discharge of the cutting powder, and as a result, processing into a predetermined shape with high precision.

[0010] Preferably, a cast model in a full mold method is formed by cutting the foamed resin member.

Further, in any of the above-described processing apparatus and processing method, it is preferable to move the tool in a zigzag manner along the predetermined shape when performing cutting by the tool (claims 2 and 5). Thus, the foamed resin member is directly cut into the predetermined shape.

In the process of cutting the foamed resin member, the tool may be moved in a zigzag manner when the foamed resin member is to be lowered on a plane surface (claims 3 and 6). . By this, when there is already a gap around, to prevent the tool zigzag operation,
Make the processing process more efficient.

[0013]

An embodiment of the present invention will be described below in detail with reference to the drawings. In the present embodiment, the tool 1 is a tool shown in FIG. 6 for cutting a foamed resin member such as styrene foam, and a case where the tool 1 is used to manufacture a cast model by a full molding method will be described as an example.

FIG. 1 is a view for explaining the movement locus of a tool at the start of cutting as one embodiment of the present invention. FIG. 2 is a diagram showing an example of a tool path from before cutting to after cutting as one embodiment of the present invention,
The dashed line indicates the idle feed of the tool 1, and the solid line indicates the actual machining.

In this embodiment, when the tool 1 is moved to a predetermined position and the plain surface of the styrofoam 2 is first cut out, the tool 1 is shown by a solid line in FIG. Like tool path 3, it descends while moving zigzag. By moving the tool 1 in this manner, a gap is generated around the tool 1,
Chips are easily scattered to the outside, and Styrofoam 2
Therefore, it is possible to prevent a required portion of the expanded polystyrene 2 from melting due to heat generation. In this embodiment,
The span of the zigzag movement in the lateral direction of the tool 1 is about 10 mm, and the moving speed of the tool path 3 in each oblique direction is 2000 mm.
/ Min.

When the plain surface of the styrofoam 2 is first cut out, the zigzag movement of the tool 1 shown in FIG. 1 is cut out as shown in the top view of FIG. Perform along line 5. In this case, the processing apparatus may correct the linear zigzag locus into an arc shape along the cutout line 5 by a general method.

FIG. 3 is a block diagram of a processing apparatus according to an embodiment of the present invention, for example, an NC processing apparatus.

In the figure, reference numeral 22 denotes a display such as a CRT,
Reference numeral 3 denotes a keyboard as input means; 24, a ROM for storing a boot program and the like; 25, a RAM for temporarily storing various processing results; 26, tool path data based on design data of a prepared casting mold. Such as a hard disk drive (HDD) for storing a program for generating NC data, a program for generating so-called NC data based on the generated tool path data, and a program for realizing the operation control of the tool according to the present embodiment. Equipment, 27
Is a communication interface for communicating with an external device via a communication line 30, and 28 is a machining unit that actually performs machining such as cutting. These components are connected via an internal bus 29 and the CPU 21
Controls the entire processing apparatus in accordance with the program stored in the storage device 26.

FIG. 5 is a flowchart showing a tool lowering operation of the machining apparatus according to one embodiment of the present invention. The machining apparatus generates an NC based on a series of tool path data of the tool 1 created in advance. In the process of controlling the operation of the tool 1 attached to the machining unit 28 in accordance with the data, a determination process performed when the tool 1 is moved down is shown.

In the drawing, when the machining device finishes the idle feeding of the tool 1 (step S1), it determines whether or not the surroundings have already been machined (step S2). This is Tool 1
When processing the, if the surrounding has already been processed,
This is because there is no need to create a gap as shown in FIG. 1 by operating the tool 1 in a zigzag manner. In this decision,
Among a series of tool path data of tool 1 created in advance,
It may be determined whether or not the coordinate values of the position at which the tool 1 descends are included in the coordinate values included in the trajectory that has been moved so far.

If the determination in step S2 is YES, the tool 1 is lowered vertically in step S6. On the other hand, if the determination in step S2 is NO, it is determined whether or not the coordinates of the position at which the tool 1 descends are offset from the cutout line by the radius of the tool 1 (step S3).

If the determination in step S3 is YES, the linear predetermined zigzag operation is corrected to an arc shape along the cutout line, and the tool 1 is lowered while performing the zigzag operation based on the corrected trajectory. (Step S4). On the other hand, if the determination in step S3 is NO, the tool 1 is lowered by a predetermined linear zigzag operation (step S5).

In the embodiment described above, in the machining apparatus shown in FIG. 3, tool path data (NC
Data), the judgment processing is performed when the tool 1 is moved downward while the operation control of the tool 1 is performed. However, the present invention is not limited to this. It may be performed at the time of creation.

[0024]

As described above, according to the present invention,
A processing device for processing a foamed resin member with high accuracy and a method for processing a foamed resin member are provided.

[0025]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a movement trajectory of a tool at the start of cutting as one embodiment of the present invention.

FIG. 2 is a diagram showing an example of a tool path from before cutting to after cutting as one embodiment of the present invention.

FIG. 3 is a block diagram of a processing apparatus as one embodiment of the present invention.

FIG. 4 is a top view of a zigzag operation when the tool is moved down along a cutting line.

FIG. 5 is a flowchart showing a tool lowering operation of the processing apparatus as one embodiment of the present invention.

FIG. 6 is a view showing the shape of a general tool for cutting a foamed resin member.

FIG. 7 is a diagram illustrating a conventional tool path when a plain surface of a foamed resin member is first cut out.

[Description of Signs] 1: Tool, 2: Foam resin member (Styrofoam), 4: Tool locus, 21: CPU, 22: Display, 23: Keyboard, 24: ROM, 25: RAM, 26: Storage device, 27: Communication interface, 28: machining unit, 29: internal bus, 30: communication line,

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takanori Sakamoto 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd.

Claims (7)

[Claims] 1. A processing apparatus comprising a control means for cutting a foamed resin member into a predetermined shape by rotating and moving a tool, wherein the control means is configured to cut a foamed resin member.
By reciprocating a predetermined amount in a direction orthogonal to the center axis of the tool, and by advancing in the direction of the center axis,
A processing apparatus for moving the tool in a zigzag manner. 2. The processing apparatus according to claim 1, wherein the control means moves the tool in a zigzag manner along the predetermined shape when performing cutting by the tool. 3. The process according to claim 1, wherein the control means moves the tool in a zigzag manner when cutting down the foamed resin member on a plain surface of the foamed resin member. Item 5. The processing apparatus according to Item 1. 4. A processing method for cutting a foamed resin member into a predetermined shape by rotating and moving a tool, comprising: reciprocating a predetermined amount in a direction orthogonal to a center axis of the tool; By moving forward in the central axis direction,
A method of processing a foamed resin member, wherein the tool is moved in a zigzag manner. 5. When cutting with the tool,
The processing method according to claim 4, wherein the zigzag movement is performed along the predetermined shape. 6. The processing according to claim 4, wherein, in the step of cutting the foamed resin member, the tool is moved in a zigzag manner when the lowering process is performed on a plain surface of the foamed resin member. Method. 7. The processing method according to claim 4, wherein a cast model in a full mold method is created by cutting the foamed resin member.