JPS6247138B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerically controlled processing device that can perform integrated processing of various types of molds such as electroforming molds and injection molding molds.

These molds are manufactured through complicated processes using various machine tools, so process control is not necessarily easy.

Taking the electroforming mold used to manufacture an electroformed shell as an example, the material, that is, the workpiece, is first rough-machined with a milling cutter, then shaped by electrical machining such as electrical discharge machining, finished with a grinding finish, finished with a mirror finish, and surface oxidized. Although it is possible to devise a variety of processing methods, in order to adopt the most rational processing method, it is necessary to have a technology that is well-versed in all of these technologies. It requires people.

In addition, in the past, each of these processes was performed using separate machine tools, and in factories far apart.
During this time, time and manpower were often wasted.

Furthermore, although these electroforming molds are not manufactured in large quantities at once, they are often manufactured repeatedly at approximately regular intervals, and some changes may be made based on the results of use. This is often the case. Therefore, it is extremely uneconomical to study and plan suitable processing methods in response to these demands, and conventionally, it also required a lot of manpower to keep records of these processing methods.

The present invention has been made to solve the above problems, and its purpose is to provide a single numerically controlled processing device that can integrally manufacture various types of molds.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic plan view showing one embodiment of a numerically controlled processing apparatus according to the present invention, and FIG. 2 is a sectional view taken along the cutting line - in FIG. 1.

In the figure, 1 is a base, 2 and 3 are guides provided on the base 1, 4 is a numerical control device, 5 is a power supply circuit for various electrical machining, and 6 is for electrical machining such as electric discharge machining and electrolytic machining. 7 is a processing liquid supply device for grinding, 8 and 9 are first and second surface treatment liquid supply devices, respectively, and 10 is a column 1
1. Arm 12, processing head 13 and stem 14
15 is a workpiece supporting part, 16 is a workpiece, and
is an adapter for attaching the workpiece, 17 is the guide 2,
an electric processing tank movably supported on 3;
18 is an X-axis moving table 19, a Y-axis moving table 20, and hydraulic cylinders 21, 21 and 2.
2, X-axis direction guide 23, 23, Y-axis direction guide 2
A cross table composed of 4, 24, 25
2 is a rod-shaped or full-shaped electrode for electrical machining mounted on the cross table 18; 26 is a pump unit for returning electro-machining fluid; 27 is a hydraulic cylinder for moving the electro-machining tank; 28 is a surface treatment tank;
9 is a pump unit for surface treatment liquid return, 3
0 and 31 are hydraulic cylinders for moving the surface treatment tank, 32 is a milling machine, 33 is a spindle supported to be rotatable and movable in two axes perpendicular to the central axis of rotation, and 34 is attached to the tip of the spindle 33. 35 is a tool magazine containing milling cutters, polishing tools and other various tools 36, an electric machining unit 37, a grinding unit 38 for electrolytic grinding, etc., and 39 is an automatic tool changer. .

In order to simplify the drawings and omit complicated explanations, well-known parts that are not directly related to the present invention, particularly the workpiece support part 10 and the milling machine 3, will be explained.
A drive device and a control device for operating 2, and
Illustrations of switching valves for operating each hydraulic cylinder, encoders for confirming operation, etc. are omitted.

The standard processing procedure will be explained below.

The column 11 of the workpiece support section 10 is connected to the arm 1
A processing head 13 provided at the tip of the arm 12 is provided with a stem 14 that can be moved up and down, and a workpiece 15 is supported at the lower end of the stem 14 via an adapter 16. is attached, and the positions of the arm 12 and stem 14 are as follows.
It is controlled by a known motor or other actuator (not shown) which is controlled by a numerical control device 4.

The workpiece 15 mounted on the machining head 13 so as to be movable up and down is usually first roughly machined by a milling machine 32 .

An automatic tool changer 39 controlled by the numerical controller 4 takes out a predetermined milling cutter 34 from the tool magazine 35 and attaches it to the tip of the spindle 33.

The milling machine 32 moves the rotation center axis of the spindle 33 to a specified position in response to a command from the numerical control device 4, and rotates the spindle 33 at a predetermined speed.

Meanwhile, while the spindle 33 is rotating, the milling cutter 3
A relatively machining feed is applied between the workpiece 4 and the workpiece 15, and the workpiece 15 is milled.

The automatic tool changer 39 takes out designated tools 36, 36 from the tool magazine 35 in response to commands from the numerical control device 4, and replaces them with those attached to the milling machine 32.

In addition, during this milling work, the electric machining tank 1
7 is retracted to the position indicated by the broken line, and chips from the milling cutter are collected by a known collection device (not shown).

After the milling process is completed, the electric machining section performs electric machining such as electrical discharge machining and electrolytic machining.

The electric machining section includes an electric machining tank 17, a cross table 18 housed therein, hydraulic cylinders 21, 21 and 22, a hydraulic cylinder 27 for moving the electric machining tank, a power supply circuit 5, and a machining fluid supply for electric machining. It consists of 6 devices etc.

The electric machining tank 17 is located below the machining head 13 together with the surface treatment tank 28, and the workpiece support 1
Guides 2 and 3 provided across the front of 0
A moving hydraulic cylinder 27 that responds to commands from the numerical control device 4 moves the machining position shown by the solid line in the figure and the electrode replacement position shown by the dashed-dotted line along the guides 2 and 3. be forced to move between

Inside the electric machining tank 17, a cross table 18 and hydraulic cylinders 21, 21, 22, which are actuators thereof, are provided.
The cross table 18 is the X-axis direction moving table 1
9, Y-axis direction moving table 20, hydraulic cylinder 2
1, 21 and 22, X-axis direction guide 23, 23, Y
The X-axis direction moving table 19 is made to move in the X-axis direction in the figure along the X-axis direction guides 23, 23 by hydraulic cylinders 21, 21. The Y-axis moving table 20 placed above is guided in the Y-axis direction 24, 24 by a hydraulic cylinder 22.
is moved in the Y-axis direction.

In response to a command from the numerical control device 4, the automatic tool changer 39 takes out a predetermined electric machining general electrode 25 from the tool magazine 35 and attaches it to the Y-axis moving table 20.

In such a case, the hydraulic cylinder 27 for moving the electric machining tank contracts according to a command from the numerical control device 4.
The electrical machining tank 17 is moved to the machining position indicated by the solid line, and then a predetermined machining fluid for electrical machining, such as kerosene, is supplied from the machining fluid supply device 6 to the inside of the electrical machining tank 17. Hydraulic cylinders 21 and 2 are activated by commands from device 4.
1 and 22 are activated, the relative positions of the workpiece 15 and the electric machining rod or the full-form electrode 25 are controlled so that they face each other with an appropriate machining gap, and at the same time, the power supply circuit 5 connects the two with each other. Voltage pulses etc. for electrical processing are supplied to the workpiece 15, and electrical processing is performed on the workpiece 15.
Hydraulic cylinder 2 based on commands from numerical control device 4
1, 21, 22, or even arm 12
By the operation of the stem 14, processing feed or further shape creation processing feed is given to the electrically processed rod-shaped or full-shaped electrode 25.

When the predetermined electrical processing is completed, the electrical processing tank 17 is returned to the electrode exchange position, and then finishing processing is performed by grinding, polishing, etc. on the processed and formed surface.

Finishing mainly involves attaching a polishing attachment to the milling machine 32, mechanically grinding and polishing the processed and formed surface by electrical machining, and finishing it to a mirror finish using techniques such as lapping and buffing. All machining feeds are also automatically performed according to commands from the numerical control device 4.

In addition, the electrolytic grinding unit 3 is installed in the tool magazine 35.
8, it is possible to finish to a predetermined state by electrolytic grinding.

That is, this electrolytic grinding unit 38 is equipped with an electrolytic grinding grindstone, an electrolytic grinding power supply line, and an electrolytic grinding machining fluid supply nozzle, and the automatic tool changer is operated based on commands from a numerical control device. The electrolytic grinding unit is attached to and removed from a milling machine, and the milling machine performs electrolytic grinding on a workpiece using the electrolytic grinding unit based on commands from a numerical control device.

After finishing the processed and formed surface by milling and then electric machining to a predetermined mirror-like state, an oxide film for peeling off the formed electroformed shell is directly applied to this mirror-like formed surface by anodizing. However, electroformed shell metal (e.g.
It is also possible to form a thin plating film of a metal suitable for Ni), for example, Ni, and to anodize part or most of this plating film as described below.

In order to form the plating film, the surface treatment tank 28 is moved to a processing position directly below the processing head 13.

The surface treatment tank 28 is divided into two chambers 28b and 28c by a partition plate 28a, and at this stage, the Ni plating liquid sent from the first surface treatment liquid supply device 8 is used in the first treatment chamber 28b. Ni-metsuki is performed.

The processing head 13 lowers the workpiece 15 into the plating liquid in the first processing chamber 28b, and current is supplied from the plating output terminal of the power supply circuit 5 to a known electrode (not shown) and the workpiece 15. , Ni plating is performed.

Next, this Ni-plated surface (mirror-like) is anodized, which is a technique disclosed by the present inventors in Japanese Patent Application No. 166536/1983, in which 1 cm ² of the mirror-finished surface is A current of 0.08 to 0.24 coulombs is applied to form an anodic oxide film, making it easier to remove the electroformed shell.

To perform this treatment, the workpiece 15 is moved into the second processing chamber 28c, a chromic acid solution is supplied from the second surface treatment liquid supply device 9 into the second processing chamber 28c, and the workpiece 15 is moved into the second processing chamber 28c. The body 15 is immersed in the solution, a predetermined amount of electricity is supplied from the power supply circuit 5 according to a command from the numerical control device 4, and then the chromic acid is recovered by the pump unit 29 for returning the surface treatment liquid. Furthermore, water washing and the like are performed by a device not shown.

Next, the process moves on to the process of producing an electroformed shell on the processed forming surface by electroforming, and the surface treatment tank is moved again, and the Ni plating thin film (mirror-like, Unlike the static plating state of formation, a dynamic electroforming method, in some cases a high-speed electroforming method that is about 10 times faster than conventional electroforming, is applied to the processed forming surface of the anodic oxide film.
An electroformed shell to be peeled off and recovered later is formed to a desired thickness.

Therefore, it is recommended that this high-speed electroforming method be based on the electroforming method disclosed by the present inventors in Japanese Patent Application No. 125103/1982, Japanese Patent Application No. 125104/1983, etc., but conventionally known methods may be used. But of course there is no problem.

Further, when it becomes necessary to remove dendrites, needle crystals, etc. generated on the electroforming surface during electroforming, the workpiece 15 is pulled up from the electroforming liquid by a command from the numerical control device 4, and a milling machine (described later) These removal processes are performed by electrolytic grinding by the electrolytic grinding unit 32 and electrolytic grinding unit 38, electrical machining such as the above-mentioned electric discharge machining, or other machining means.

Further, when a predetermined electroforming process is completed, the workpiece 15 is similarly pulled up from the electroforming liquid according to a command from the numerical control device 4, and the process is completed.

Since the present invention is constructed as described above, it is an object of the present invention to provide a single numerically controlled processing device that can integrally manufacture various types of molds.

Note that the configuration of the present invention is not limited to the embodiments described above, and the apparatus of the present invention can widely employ known machine tools and devices other than those described above within the scope of the purpose of the present invention. For example, as a tool to be attached to a milling machine, for example, an electric machining unit equipped with a rod-shaped electrode, a power supply line for electric machining, and a machining fluid supply nozzle can be used, and it is also possible to arrange, replace, or replace these devices. The design of the method, the structure of the workpiece support section, etc. can be freely changed, and the power source, processing liquid supply device, etc. can also be changed, and the present invention encompasses all of them.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing one embodiment of a numerically controlled processing apparatus according to the present invention, and FIG. 2 is a sectional view taken along the cutting line - in FIG. 1. 1... base, 2, 3... guide, 4... numerical control device, 5... power supply circuit, 6... machining fluid supply device for electrical machining, 7… machining fluid supply device for electrical machining, 8...First surface treatment liquid supply device, 9...Second surface treatment liquid supply device, 10...Workpiece support section, 11...Column, 12...Arm, 13...
Processing head, 14...Stem, 15...Workpiece, 16...Adapter, 17...Electric processing tank, 18...Cross table, 19...X-axis direction moving table, 20...Y-axis direction moving table ,
21, 22...Hydraulic cylinder for cross table, 23...X-axis direction guide, 24...Y-axis direction guide, 25...General electrode for electric machining, 26...Pump unit for electric machining fluid return, 27...Hydraulic cylinder for moving the electric processing tank, 28...Surface treatment tank, 29...Pump unit for returning surface treatment liquid, 30, 31...Hydraulic cylinder for moving the surface treatment tank, 32...Milling machine, 3
3...spindle, 34...milling cutter, 35...
Tool magazine, 36... Tool, 37... Electric machining unit, 38... Electrolytic grinding unit, 39
...Automatic tool changer.

Claims (1)

[Scope of Claims] 1. A numerically controlled processing device comprising the components described in items (a) to (g) below. (a) Numerical control device. (b) A workpiece support section that is equipped with a processing head capable of supporting a workpiece in a vertically movable manner, and a column and an arm that support the processing head, and that operates in response to commands from the numerical control device. (c) A guide device provided across the front surface of the workpiece support, and a support that is movably supported by the guide device at least between a machining position provided below the machining head and an adjacent electrode exchange position. an electrically processed tank, a cross table for attaching an electrode provided in the electrically processed tank, an actuator for driving the cross table, a device for moving the electrically processed tank on the guide, and the electrically processed tank. and a power supply circuit capable of supplying voltage pulses, etc. for electrical machining to the electrodes attached to the cross table and the workpiece attached to the workpiece support, and An electrical processing section that operates in response to commands from a control device. (d) a surface treatment tank supported movably between a processing position provided at least below the processing head and a retracted position adjacent thereto by a guide device provided across the front surface of the workpiece support; , a device for moving the surface treatment tank on the guide, a device for supplying a surface treatment liquid into the surface treatment tank, a surface treatment electrode provided in the surface treatment tank, and a surface treatment electrode provided in the surface treatment tank; A surface treatment section comprising a power supply circuit capable of supplying current for surface treatment between an electrode and a workpiece, and operating in response to commands from the numerical control device. (e) A milling machine that is installed opposite the processing head and operates in response to commands from the numerical control device mentioned above. (f) A tool magazine that stores tools (including electrodes; the same applies hereinafter) used in the electrical machining section and milling machine. (g) An automatic tool that is installed adjacent to the electrode exchange position of the electric machining tank and the milling machine, operates in response to commands from the numerical control device, and attaches and detaches tools from the tool magazine to and from the electric machining section and the milling machine. Exchange device. 2. The tool magazine is equipped with an electric machining unit that includes a rod-shaped electrode, an electric machining power supply line, and a machining fluid supply nozzle, and the automatic tool changer changes the electric machining unit based on a command from a numerical control device. Claim 1: The milling machine can be attached to and detached from a milling machine, and the milling machine can perform electrical machining on a workpiece using the electrical machining unit based on commands from a numerical control device.
Numerical control type machining equipment described in section. 3. The tool magazine is equipped with an electrolytic grinding unit that includes an electrolytic grinding wheel, an electrolytic grinding power supply line, and an electrolytic grinding machining fluid supply nozzle, and the automatic tool changer performs the above operations based on commands from the numerical control device. 2. The numerically controlled processing apparatus according to claim 1, wherein the electrolytic grinding unit can be attached to and removed from a milling machine, and the milling machine can perform electrolytic grinding on a workpiece using the electrolytic grinding unit based on commands from a numerical controller.