JPH11291020A - Device for monitoring taking-out of molding material from casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the effective and simple monitoring for securing the accurate taking-out of a mold by providing one piece of an exhaust air introducing pipe or an exhaust air storage disposing a pressure monitoring gage therein in a hammer unit. SOLUTION: Compressed air is fed to a compressed air supplying pipe 5 and then, the hammer head 7 develops a striking movement and the exhaust air is exhausted through an exhaust air conduit 6. The pressure monitoring gage 9 is disposed with some distance from the hammer unit 4 and further, from an opening end part 8 and connected with an electronic assessment circuit through an electric connecting cables 10. The compressed oil vigorously pulsates at the time of exhausting from the hammer unit 4, but since the exhaust air conduit 6 is long, the pulsation is weakened at the tip part. Since the pressure monitoring gage 9 is disposed with the sufficient distance from the opening end part 8, the pulsation can sufficiently be detected even at the opening end 8. In the case that the hammer head does not contact with a casting, the pulsation can be detected with the increase of working frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for monitoring the removal of a mold having a core from a casting, the apparatus including at least one hammer unit operated by compressed air.

[0002]

2. Description of the Related Art In mass production of castings, it is necessary to remove as much as possible mold material from the castings. Because they contaminate or damage the transport means and processing machines used in subsequent processing operations and have a significant adverse effect on the function of those means and machines.

[0003] For the purpose of casting removal, the automated processing process includes a pneumatically driven hammer unit, wherein a feeder unit or a feed unit directs the casting material such that the hammer head strikes the casting material. Be moved. Then, when the hammer unit is operated, the hammer head performs a striking operation with an adjustable time within about 50 seconds. For this purpose, in particular, the casting is placed on an elastic vibration plate.

[0004] Upon completion of this hammering step, the at least one hammer unit is switched off and the feeder unit is returned to its original position. Thereafter, the casting from which the mold has been removed is sent to a mold removal position, while another casting is moved from the filling position to the mold removal position.

[0005] In general, the mold removal operation can be performed incorrectly because two major failures are likely to occur. First, due to incorrect placement of the casting,
The hammer head may not make good contact with the casting.
Furthermore, even if the hammer head comes into contact with the casting due to the hammer being damaged or worn,
The hammer may no longer function properly. In a dirty environment, the degree of wear of the hammer is very high, so that pressure sealing is impaired relatively quickly. Moreover, due to rough operating conditions, damage will occur very frequently, for example on pressure pipelines.

In a fully automated mold removal operation from a casting, it is important to introduce an effective and simple monitoring process to ensure accurate mold removal. Otherwise, damage can occur before a driving error is discovered.

[0007]

It is an object of the present invention to provide such a monitoring device.

[0008]

This object is achieved by providing at least one hammer unit with a single exhaust air conduit or reservoir in which a pressure monitoring instrument is located.

The measures proposed here are suitable both for monitoring the predetermined operating frequency of the hammer unit and for monitoring the required intensity of the hammering operation. For example, if the hammer head does not accurately contact the work part, the hammer will increase the frequency of operation,
As a result, a defective operation is immediately detected and the movement of the casting is interrupted.

[0010] If the operating process is stopped due to hammer wear or hammer breakage, it is also possible to detect a defect by comparing with a standard operating frequency. If the blow-through becomes too large due to wear of the hammer, even if the operation frequency is normal, it can be detected by the fact that the pressure level in the discharge pipe of the compressed air drops below a predetermined normal value.

[0011]

In the preferred embodiment, the exhaust air conduit is in the form of an open-ended pipeline, within which a pressure monitor is provided at a distance from the hammer unit and a sufficient distance from the open end. Instruments shall be arranged. By placing the pressure monitoring instrument at a certain distance from the hammer unit, it is possible to create good environmental conditions for the pressure monitoring instrument,
In particular, the instrument will be isolated or isolated from mechanical vibration. Placing the monitoring instrument away from the open end keeps the pulses of the pressure monitoring instrument high enough so that the frequency of operation can be reliably detected by simple electronics.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Although a preferred embodiment of the present invention is schematically illustrated in FIG. 1, the feeder unit 1 is substantially in the form of a double-acting pneumatic cylinder, which alternates between supplying and discharging compressed air. Two compressed air supply pipes 2, 3
It is connected to the.

The pneumatic hammer unit 4 is arranged to directly and mechanically connect to the feeder unit 1. The hammer unit 4 includes a compressed air supply pipe 5
And an exhaust pipe 6, which includes a hammer head 7, which can move in and out of contact with the casting by the movement of the feeder unit 1.

When the compressed air is sent to the compressed air supply pipe 5, the hammer head 7 performs a striking operation, and the discharged air is discharged through the discharge air conduit 6. A pressure monitoring instrument 9 is located at a distance from the hammer unit 4 and at a distance from the open end 8, which is connected by an electrical connection cable 10 to an electronic assessment circuit.

[0015] The compressed air that is violently pulsating when discharged from the hammer unit 4 is reduced in pulsation due to the long discharge air conduit 6. Since the pressure monitoring instrument 9 is arranged at a sufficient distance from the open end 8, pulsation can be sufficiently detected even at the open end 8.

In particular, if the hammer head does not come into contact with the casting, it can be detected by an increase in the operation frequency, and if an excessive pressure drop occurs due to wear of the hammer unit, it is detected by a decrease in the pressure level. be able to.

[0017]

According to the present invention, effective and simple monitoring that ensures accurate mold removal can be performed. The device of the present invention is inexpensive and robust, and can fully satisfy the above-mentioned objectives.

[0018]

[Brief description of the drawings]

FIG. 1 schematically shows a preferred embodiment of the device of the invention.

Claims (4)

[Claims] 1. A device for monitoring the removal of a mold material having a core from a casting enclosing at least one hammer unit operated by compressed air, said at least one hammer unit (4) comprising a pressure monitoring device. An apparatus for monitoring mold material removal, comprising an exhaust air conduit (6) or an exhaust air reservoir (tank) having an instrument (9) disposed therein. 2. The exhaust air conduit (6) is in the form of an open-ended pipeline, in which the pressure monitoring device (9) is located.
2. The device according to claim 1, wherein the is arranged at a distance from the pipeline end. 3. The pressure monitoring device (9) is connected to an assessment circuit for comparing the frequency and / or pressure level of pulsations in the exhaust air conduit (6) with a standard value. 3. Apparatus according to claim 1 or 2, characterized in that: 4. Apparatus according to claim 1, wherein the hammer unit (4) is arranged on a pneumatically operated feeder unit (1).