JP2885767B2 - Jet honing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet honing apparatus for spraying high-pressure water onto a workpiece to remove burrs and dirt on the surface.

[0002]

2. Description of the Related Art FIG. 5 is a view for explaining an example of a conventional jet honing apparatus. Conventionally, this type of jet honing apparatus includes, as shown in FIG. 5, a nozzle 3 for jetting water 4 onto a lead frame 5 which is a workpiece to be sent in one direction under the control of a transfer control unit 6, The pump 1 includes a pump 1 for supplying a nozzle 4 to a nozzle 3 and a pressure regulating valve 2 for regulating the pressure of water.

In the actual deburring operation, the lead frame 5 is transported at a constant speed by the transport control unit 6 to remove burrs and dirt on the surface by the impact of water. Then, after the lead frame 5 passed through the water jetting area, it was visually inspected whether or not burrs had been removed.

[0004]

In the conventional jet honing apparatus described above, even if the nozzle is slightly clogged, a sufficient amount of water is not jetted, and dirt that cannot be visually recognized remains on the lead frame. It will be sent to the next process as it is. For this reason, when the next step is a mets step, there is a problem that plating is not applied on the entire surface and a defective product is generated.

Further, even if the clogging state is visually observed from the water injection state, it has been difficult to find a slight clogging which impairs the quality. Further, by the time clogging progresses until it can be visually confirmed, many lead frames are sent to the next step, and a large number of defective products are generated. It is conceivable to frequently replace the nozzle so as not to cause this problem. However, there is a problem that a large amount of time is wasted in replacing the nozzle and the operation rate of the apparatus is reduced. In addition, many expensive nozzles must be prepared, which increases operating costs.

A method for detecting such nozzle clogging is disclosed, for example, in Japanese Patent Application Laid-Open No. 59-126932. In this detection method, a floating piece that moves in accordance with the flow rate is provided in a fluid pressure feeding pipe for supplying paint to an air spray nozzle for spraying paint, and the movement of the floating piece activates a micro switch to cause clogging. Is detected. However, providing such a complicated mechanism under the high-pressure water flow may cause a failure in the detection mechanism. Further, the operating range of the microswitch itself is wide and the detection accuracy is poor, and it is difficult to detect slight clogging such as jet honing.

Accordingly, an object of the present invention is to provide a jet honing device capable of detecting a slight clogging and immediately repairing it without requiring a particularly complicated detecting mechanism.

[0008]

SUMMARY OF THE INVENTION A feature of the present invention is that a nozzle for injecting water to a workpiece sent from one direction, a pump for supplying the water to the nozzle, and a pressure of the supplied water are controlled. A pressure regulating valve for adjusting, a flow meter for measuring the flow rate of the water supplied to the nozzle, and stopping the feed of the workpiece when the flow rate value of the flow meter decreases and adjusting the pressure regulating valve Then, after increasing the pressure of the water and supplying the water to the nozzle for a predetermined time, the pressure is returned to the water, and it is determined whether or not the flow rate of the water is normal. And a control unit that stops the operation of the apparatus if not provided. Further, it is preferable that the flow meter is provided independently for each of the plurality of nozzles.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration for explaining a jet honing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the jet honing apparatus is provided with a flow meter 7 provided in the middle of a pipe for supplying water to two nozzles 3, and receives a flow value signal from the flow meter 7 and compares it with a reference flow value signal. If the flow rate is low, the opening of the pressure control valve 2 is adjusted to increase the pressure, and water 4 flows through the nozzle 3 for a predetermined time. A control unit 8 is provided to continue the operation when the value is equal to or more than the value and to stop the operation when the value is smaller than the reference flow value.

The nozzle 3, the transport control unit 6, and the pump 1 are provided in the same manner as in the conventional example. It is desirable that the flowmeter 7 use an ultrasonic flowmeter having no mechanism instead of a flowmeter having a wing or a float that moves by a water flow. The pressure regulating valve 2 is a valve having a needle valve structure, and the opening degree of the needle valve is precisely controlled by a step motor. The control unit 8 includes a transport control unit 6
, And control of the pressure regulating valve 2 based on the input of the flow meter 7 and sequence control including starting and stopping of the pump 1.

FIG. 2 is a graph showing the correlation between the nozzle hole diameter and the flow rate, and is a graph showing the correlation between the nozzle hole diameter and the flow rate. . Until the present invention, the correlation with the hole diameter of the nozzle 3 was determined in advance. As a result, as shown in FIG. 2, it was found that the hole diameter of the nozzle 3 and the flow rate were substantially proportional.

[0013] Therefore, usually used 0.15mm
Pressure of 700 cm 2 per square centimeter using nozzle 3
The flow rate was reduced gradually from kilograms, and the flow rate was lowered. As a result, it was possible to remove even from 0.4 liter per minute to 0.35 liter per minute. This means that the hole diameter is from 0.15 mm to 0.14 m from FIG.
It can be said that there is no need to replace the nozzle 3 even when the value reaches m.

The decrease in the hole diameter of the nozzle 3 is caused by
This is the same as depositing scale in the nozzle 3. So, I tried to determine how much the scale could raise the water pressure before it could be removed. As a result, it was found that the gas could be removed by flowing for several seconds at a pressure two to three times the steady pressure.

FIG. 3 is a flow chart for explaining the operation of the jet honing apparatus of FIG. Next, the operation of the jet honing apparatus will be described with reference to FIGS. First, in step A of FIG. 3, the lead frame 5 of FIG.
Is injected. Then, at step B in FIG. 3, the flow signal value of the flow meter 7 in FIG. And
The control unit 8 compares the input flow signal value with the reference flow signal value to determine whether the flow signal value is lower than the reference flow signal value.

If not, the operation returns to step A and the operation is continued. On the other hand, if the flow signal value is low, the process proceeds to step C, where a command signal is transferred from the control unit 8 to the transport control unit 6, and the movement of the lead frame 5 is stopped. Then, in step D, a predetermined number of pulse currents are supplied from the control unit 8 to the step motor of the pressure regulating valve 2 to increase the opening of the pressure regulating valve 2 to, for example, three times the normal degree. As a result, an effect is produced in which the water 4 that has rapidly increased in the nozzle 3 flows and the scale deposited in the nozzle 3 is peeled off. And
After a lapse of several seconds, the opening degree of the pressure regulating valve 2 is returned to the original state according to a command from the control unit 8.

In step F, the flow signal value is input from the flow meter 7 to the control unit 8 and compared with the reference flow signal value.
If the flow rate signal value is equal to or greater than the reference flow rate signal value, it is determined that the deposit on the nozzle 3 has been removed, and the process proceeds to step H.
The transport of the lead frame 5 is started, and the operation in step A is continued. If the flow signal value is lower than the reference flow signal value, the process proceeds to step G, where an alarm is generated and the operation of the device is stopped. Then, the nozzle is replaced or cleaned and repaired.

FIG. 4 is a view showing a modified example of the jet honing apparatus of FIG. This jet honing device
As shown in FIG. 4, a flow meter 7 was attached to each of the individual nozzles 3, and clogging detection and repair were specified. By this, even if the nozzle 3 which cannot remove the sediment occurs even if the water pressure is increased, all the nozzles 3
It is not necessary to clean or replace the nozzles, and only the nozzles whose clogging could not be repaired need to be performed.

[0019]

As described above, the present invention measures the flow rate of water supplied to the nozzle, and when the flow rate is lower than the standard, increases the water pressure to produce an effect of separating the deposits in the nozzle, Since it is possible to prevent water pressure from leaking in advance to prevent the occurrence of clogging that reduces the ability to remove burrs and dirt, the burrs and dirt of the lead frame sent from the upstream process are completely removed, preventing the occurrence of defective products in the next process This has the effect of improving the yield.

In addition, since most nozzles are controlled and operated so that clogging does not occur automatically, the number of stoppages of the apparatus due to repair or replacement of the nozzles is reduced, so that the operation rate of the apparatus increases and the operation of the apparatus increases. There is an effect that cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration for explaining a jet honing apparatus according to an embodiment of the present invention.

FIG. 2 is a graph showing a correlation between a nozzle hole diameter and a flow rate.

FIG. 3 is a flowchart illustrating an operation of the jet honing apparatus of FIG. 1;

FIG. 4 is a view showing a modified example of the jet honing apparatus of FIG. 1;

FIG. 5 is a diagram showing a configuration of an example of a conventional jet honing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Pressure control valve 3 Nozzle 4 Water 5 Lead frame 6 Transport control part 7 Flow meter 8 Control part

Continuation of front page (58) Fields investigated (Int. Cl. ⁶ , DB name) B24C 5/02 B08B 3/02 B24C 3/00 B26F 3/00 H01L 21/304 341

Claims (2)

(57) [Claims] 1. A nozzle for injecting water to a workpiece sent from one direction, a pump for supplying the water to the nozzle, a pressure adjusting valve for adjusting a pressure of the supplied water,
A flow meter that measures the flow rate of the water supplied to the nozzle, and stops the feed of the workpiece when the flow value of the flow meter decreases and adjusts the pressure regulating valve to increase the pressure of the water. After the water is supplied to the nozzle for a predetermined time, the pressure is returned to the water, and it is determined whether or not the flow rate of the water is normal. If the flow is normal, the operation is continued. A jet honing apparatus, comprising: 2. The flow meter according to claim 1, wherein the flow meter is provided independently for each of the plurality of nozzles.
The described jet honing device.