JPH0158025B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) This invention suspends a barrel tank with a spring, installs an electric motor equipped with an eccentric weight, and rotates the electric motor to load the inside of the barrel tank. This invention relates to a vibrating barrel processing machine that processes a workpiece that has been inserted into the machine.

(Prior art) Conventionally, in a vibrating barrel processing machine, in order to change the excitation force caused by an eccentric weight, a machine in which the weight moves by reversing the rotating shaft and changes the relative position is used (Patent No. 772020) ), the weight was replaced manually.

(Problem to be Solved by the Invention) However, in the technique of changing the excitation force by reversing the rotation axis, the types of excitation force that can be converted are limited, and in the manual method, the device is It had the disadvantage that it required disassembly, which required a great deal of time and effort.

(Means for Solving the Problems) According to the present invention, a barrel tank is suspended by a spring, an electric motor equipped with an eccentric weight is installed, and a workpiece is loaded into the barrel tank by rotation of the electric motor. In a vibrating barrel processing machine for machining is installed to be slidable relative to the fixed weight, a hydraulic cylinder is provided in the eccentric weight, the fixed weight and the sliding weight are connected by the hydraulic cylinder, and the hydraulic cylinder is connected to the fixed weight. A pressure control valve is installed in the passage that supplies pressurized oil,
A frequency converter is connected to a power source that rotates the electric motor to configure a vibrating barrel processing machine, and the above problem has been solved.

The pressure control valve and frequency converter are controlled by a microcomputer. In addition, the barrel tank is of a circle type, a circle type with a sorting device, a box shape, or a long-distance annular type in which two parallel parts are connected by two arcuate parts, and in principle, the shape of the barrel tank is but not limited to.

(Function) That is, according to the present invention, the degree of overlap of the double-structured eccentric weights can be changed by moving the piston using hydraulic pressure. Not only can the excitation force value be changed continuously by changing the amount, but also the pressure can be controlled to a required value by controlling the electric pressure control valve. In other words, a change in oil pressure appears as a movement in the position of the sliding weight. In addition, the rotation speed of the main motor is
By attaching a frequency conversion device, the frequency of the power supply supplied to the electric motor can be easily changed by rotating the dial of the device.

(Example) The details of the apparatus of the present invention will be explained below with reference to the accompanying drawings. In FIG. 1, the barrel tank 1 is annular and has a central cylinder 2 in which an electric motor 3 is fixed. The device is suspended on a machine base 5 by a number of springs 4. Eccentric weights 9a, 9b are attached to the electric motor 3 above and below the rotating shafts 30a, 30b, one end of the hollow load rod 6a, 6b is fixed to the eccentric weight 9a, 9b, and the other end is fixed to the central cylinder 2. It is rotatably fitted into rotary joints 7a and 7b attached to the upper and lower sides of the rod, and hydraulic pipe caps 8a and 8b are attached to the rotary joints, so that pressure oil can flow into the hollow load rod. ing. the eccentric weight 9a,
If the structure of 9b is shown for the upper weight 9a, the second
As shown in FIGS. 3, 3, and 4, the lower weight 9b has the same structure and will therefore be omitted. That is, the fixed weight 10a is fixed to the rotating shaft 30a. There is a side groove 1 on the side of the fixed weight 10a.
1a, 12a are cut, and the side grooves 11a, 1
2a has lower protrusions 13b, 13 of the sliding weight 13a.
c can be fitted. Fixed weight 10
A is provided with a space 31a, and a hydraulic cylinder 14a is fixed within one side of the space 34a. The piston rod 15a of the hydraulic cylinder 14a has a protrusion 16a at its tip, and the tip of the protrusion 16a is fitted into a slit 17a provided in the sliding weight 13a. Alternatively, the protrusion 16a may be moved by a sliding weight 13.
It may be fixed to a. A spring 18a is provided inside the hydraulic cylinder 14a, and a piston 19 is provided inside the hydraulic cylinder 14a.
a is pressed toward the pressurized oil inflow side. A guide hole 20a is provided continuously to the oil hole 35 provided at one end of the hollow load rod 6a, and opens on the piston side of the hydraulic cylinder 14a. The hollow load rod 6a of the sliding weight 13a has an opening 21a in its penetrating portion;
It is designed not to interfere with the sliding movement of the sliding weight 13a. In FIG. 1, high-pressure oil on the output side of the hydraulic pump 22 is supplied with known electric pressure control valves 23a and 2.
3b (for example, a current-controlled relief valve manufactured by Toyoko Kogyo Co., Ltd.), the rotary joints 7a, 7
It is connected to hydraulic pipe caps 8a and 8b provided at b. The microcomputer system is connected from a computer input 26 to a control panel 28 via a computer main body 27, and its output is connected to a pressure control amplifier 25.
a, 25b to control the electric pressure control valve. On the other hand, another output from the control panel 28 is transmitted to the frequency conversion device 24, which converts the frequency of the power supply supplied to the electric motor 3. Also printer 29
can type various data. Note that high air pressure can be used instead of the above-mentioned hydraulic pressure.

The operation of this device will be explained based on the structure described above. If the abrasive material, unprocessed workpiece, water and compound (these charges are collectively referred to as mass) are charged into the barrel tank 1, and the electric motor 3 is rotated, the barrel tank will open. 1 vibrates, imparts a spiral flow motion to the mass, and processes the workpiece through the relative movement between the abrasive and the workpiece. At this time, experiments have shown that if the excitation force (referred to as F value) by the sliding weight 13a is the same, the slower the rotation speed, the greater the amount of polishing and is suitable for rough polishing, and the faster the rotation speed, the better the polishing amount. Good roughness and suitable for final polishing. In order to make the excitation force the same for both, use the sliding weight 13a.
must be moved. The movement of this sliding weight 13a is controlled by the electric pressure control valves 23a and 23b.
to change the supply hydraulic pressure to the hydraulic cylinder 14.
Changing the pressure applied to the piston side of a is achieved by holding the sliding weight 13a at a position where this pressure and the spring 18a are balanced. Examples under these processing conditions are as follows.

Machine used in the experiment CLR-115 (motor capacity 2.2KW) Barrel tank capacity 115 Polishing stone type AT-3 Water amount 3.5 Compound GCP (35g) Test parts standard test piece (28mmφ x 8mm) #800 paper finish material SUS * All machines, polishing stones, and compounds used are from Co., Ltd.
Made by Chippton.

(1) Rough polishing motor rotation speed 1600rpm Excitation force (F value) due to eccentric weight Approximately 1000Kg Machining time 60 minutes Amount of polishing 22mg Surface roughness 1.6μ (2) Precision polishing motor rotation speed 2200rpm Excitation force (F value) due to eccentric weight ( F value) Approximately 1000 kg Processing time 30 minutes Polishing amount 6 mg Surface roughness 1.0 μ In the above experimental example, the test piece was measured after rough polishing under condition (1), and then precision polishing was performed under condition (2). As a result, the surface roughness was considerably improved compared to the rough polishing under condition (1).

An example was shown above, but if predetermined optimal processing conditions for various purposes are registered in the computer main body 27, the control panel 28 can be controlled by the data registered in the computer main body 27. In other words, since the pressure control valves 23a, 23b and the frequency converter 24 are operated under optimal machining conditions, the rotational speed of the electric motor 3, the operating time, and the excitation force by the eccentric weights 9a, 9b are also set to the optimal machining conditions. selected and can achieve various objectives.

Furthermore, the motor rotational speed or the excitation force can be manually changed to indicate the optimum processing conditions during processing, if necessary. Further, since the excitation force is changed by adjusting the electric pressure control valve, it is possible to apply the same excitation force to the upper and lower sides, or to apply different excitation forces to the upper and lower sides.

Next, FIG. 5 shows this invention in two parallel parts 31,
31a connected by two arcuate parts 32, 32a, is used in a vibrating barrel processing machine having a long-distance annular vibration tank 33 with an oblong planar shape, and the eccentric weight, pressure control valve, frequency converter, etc. Everything is the same as in the previous embodiment. In addition to the shapes of the above-mentioned embodiments, the vibrating tank may be a known box-shaped vibrating tank,
The vibration tank of the embodiment shown in FIG. 5 may be multi-staged, or the vibration tank may be multi-staged inside and outside, or the shape of the upper opening may be triangular, square, or rhombic.

(Effects of the Invention) As described above, according to the present invention, it is possible to change the rotational speed of the electric motor and the excitation force by the eccentric weight during processing in a vibrating barrel processing machine, so that polishing can be performed by changing the conditions. We have succeeded in creating a vibrating barrel processing machine with extremely excellent performance, which allows us to visually observe the flow condition of the mass and select the ideal polishing conditions. Furthermore, although the explanation has been given above regarding a donut-shaped annular vibrating barrel processing machine, the present invention can also be applied to a box-shaped or any other shape of vibrating barrel processing machine.

[Brief explanation of drawings]

Fig. 1 is a detailed view of the device for carrying out the present invention, Fig. 2 is a partially cutaway front view of the eccentric weight, Fig. 3 is a plan view, and Fig. 4 is a sectional view. FIG. 5 is a partial sectional view when the present invention is applied to an oblong vibrating barrel. 1... Vibrating barrel processing tank, 2... Central cylinder, 3...
...Electric motor, 4...Spring, 5...Machine base, 6
a, 6b...Hollow load rod, 7a, 7b...Rotary joint, 8a, 8b...Hydraulic pipe cap,
9a, 9b...Eccentric weight, 10a...Fixed weight,
11a, 12a...Gutter, 13a...Sliding weight,
14a...Hydraulic cylinder, 15a...Piston rod, 16a...Protrusion, 17a...Slit,
18a... Spring, 19a... Piston, 2
0a... Guide hole, 21a... Opening, 22... Hydraulic pump, 23a, 23b... Electric pressure control valve, 2
4... Frequency converter, 25a, 25b... Pressure control amplifier, 26... Computer input, 27...
...CPU (central control unit), 28...Control panel, 29
...Printer, 30a, 30b... Rotating shaft.

Claims (1)

[Scope of Claims] 1. A vibrating barrel processing machine in which a barrel tank is suspended by a spring and an electric motor equipped with an eccentric weight is installed, and a workpiece loaded into the barrel tank is machined by the rotation of the electric motor. In, the eccentric weight has a double structure with a fixed weight and a sliding weight,
The fixed weight is fixed to the rotating shaft of the electric motor,
The sliding weight is installed to be slidable relative to the fixed weight, and includes a hydraulic cylinder in the eccentric weight, and the hydraulic cylinder moves the fixed weight and the sliding weight. A vibrating barrel processing machine characterized in that a pressure control valve is interposed in a passage connected to the hydraulic cylinder and supplies pressurized oil to the hydraulic cylinder, and a frequency conversion device is connected to a power source for rotating the electric motor. 2. The vibrating barrel processing machine according to claim 1, wherein the pressure control valve and the frequency conversion device are controlled by a microcomputer. 3. The vibrating barrel processing machine according to claim 1, wherein the barrel tank has a circular shape. 4. The vibrating barrel processing machine according to claim 1, wherein the barrel tank is of a circle type with a sorting device. 5. The vibrating barrel processing machine according to claim 1, wherein the barrel tank is box-shaped. 6. The vibrating barrel processing machine according to claim 1, wherein the barrel tank is of a long-distance annular type in which two parallel parts are connected by two arcuate parts.