JPS6033055A - Fluidity testing device of casting - Google Patents

Abstract

PURPOSE:To measure the fluidity of a casting quantitatively by providing plural detection electrodes whose tip parts are exposed to the pouring space of a mold and a common and a start electrode whose tip parts are exposed to the pouring space on the molten metal upstream side of detection electrodes, and detecting the conductivity between electrodes. CONSTITUTION:When molten metal is poured in the pouring space 2 from a pouring cup 9, the common electrode 10 and start electrode 11 to conduct to each other firstly over a down gate 3, and consequently a conductivity detecting circuit 13 sends a start signal Ss, so that a time measuring device 14 starts counting seconds. Then, the molten metal reaches a lower electrode 12, the conductivity detecting circuit 13 generates the electrode number (e.g. 1) of the detection electrode 12 and a conductivity signal, and consequently the time measuring device 14 stores the second counting time in the input of the conductivity signal as a time measured value together with the electrode number and also displays the time measured value and electrode number on the screen of a display device 15a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a testing device for measuring the flow condition of a cast product.

In general, in order to float foreign matter mixed in the molten metal to the riser, it is necessary to make the route and thickness of the molten metal flow path from the sprue to the riser, riser, etc. appropriate, and this casting method is unsuitable. If it is not done properly, defects such as foreign object bite defects will occur in the casting. By the way, in order to decide on this casting method, it is necessary to understand the flow condition of the molten metal in the mold, but since there was no method or device to quantitatively measure the molten metal flow condition, it is necessary to estimate the molten metal flow condition.
It was necessary to determine the casting method through trial and error, and to eliminate defects such as foreign object bite defects.

This invention has been made in view of the above points, and it is an object of the present invention to provide a casting product flow testing device capable of quantitatively measuring the melt flow condition of a casting product. However, there are a plurality of sensing electrodes disposed with their tips exposed in the pouring space of νj5, and a common electrode and a common electrode disposed with their tips exposed in the pouring space on the molten metal upstream side of the sensing electrodes. It detects continuity between the start electrode and the common electrode connected to each of the above electrodes and issues a start signal, and also detects continuity between the common electrode and each of the detection electrodes to generate an electrode number signal and a continuity signal. and a time measuring device connected to the continuity detection circuit and measuring the time from the input of the start signal to the input of each of the continuity signals and storing the time measurement value together with the electrode number. and an output device connected to the time measuring device and outputting data stored in the time measuring device.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1 is a sand mold, and 2 is a pouring space formed in this mold, including a sprue 3, a runner 4, a weir 5, a pouring space 6 corresponding to the shape of the cast product, and a riser 7.8. Consists of etc. Note that illustrations of the parting surface of the mold 1, the flask, etc. are omitted. 9 is a pouring spout consisting of a ball cup. 10 is one common electrode whose tip is exposed to the sprue 3, 11 is a single start electrode whose tip is similarly exposed to the sprue 3, and 12 is the tip of the lower part of the sprue 3 and pouring metal other than the sprue 3. A large number of sensing electrodes are exposed in the space 2, and each electrode is made of a conductor such as a coated copper wire, and is embedded in the mold 1 during mold molding. The detection electrodes 12 are preferably provided at about 100 locations, depending on the size and shape of the cast product.The locations are selected depending on the shape of the casting space 6, and each detection electrode 12 is
are numbered (for example, 1.2.3...). 13 is a continuity detection circuit to which each electrode 10, 11, 12 is connected, and 4 between the common electrode 10 and the start electrode 11
Detecting one message and emitting a star 1 signal S8,
Detect continuity between the common electrode 10 and each of the detection electrodes 12 and generate a continuity signal S. and the electrode number signal S of the sensing electrode
Although a microcomputer interface is used, a device having a dedicated multi-contact detection circuit may be manufactured and used. Reference numeral 14 denotes a time measuring device connected to the continuity detection circuit 13, which measures 1 from the input of the start signal S5 to the input of each of the continuity signals SC.
A microcomputer is used to measure the time and store it together with the electrode number, but a dedicated multi-contact time measuring device using a clock, register, memory, etc. may be manufactured and used. Connected to the output side of the time measuring device 14 are a display 15a for displaying stored data such as time measurement values of the time measuring device 14 and a printer 15b for printing the stored data as output devices 15.

Using the test equipment with the above configuration, check the flow condition of the casting product if
! To do this, when the molten metal is poured into the pouring space 2 from the pouring spout 9, first the common electrode 1o and the start electrode 111iJ] are electrically connected by the conductive molten metal at the upper part of the sprue 3. As a result, continuity detection circuit 1
3 issues a start signal S8, and upon receiving this signal, the time measuring device 14 starts counting down.

Next, when the molten metal reaches the sensing electrode 12 provided at the bottom of the sprue 3, the sensing electrode and the common electrode 1o are electrically connected by the molten metal. Conductive signal S. 1, the time measuring device 14 stores the countdown time when this conduction signal is input as a time measurement value together with the electrode number, and simultaneously displays this time measurement value and the electrode number on the screen of the display 15a. The molten metal passes through the runner 4 and the weir 5 into the casting space 6.
As the molten metal flows, the sensing electrodes 12 are made conductive one after another by the molten metal, and the time of conduction of each sensing electrode is measured and stored by the time measuring device 14 in the same manner as described above, and the time is measured and displayed.
5 It is displayed in a. When the molten metal reaches all the sensing electrodes 12 and the pouring is completed, the countdown in the time + 111 constant device 14 is stopped, and the 120 hour measurement value of each sensing electrode stored in the time constant device 14 is printed along with the electrode number by the printer 15b. to obtain a list of measurement data. This makes it possible to know in detail the time required for the molten metal to reach each position in the mold 1, and to quantitatively understand the flow situation of the molten metal. Then, for example, the above-mentioned t111 constant data list is used to find local slow-speed points of the molten metal flow in the casting space 6, and the casting method is improved to eliminate these slow-speed points, thereby preventing the occurrence of casting defects such as foreign object bite defects. It is possible to do so.

The present invention is not limited to the above-described embodiment; for example, only the printer 15b may be used as the output device 15, and real-time display on the display 15H may be omitted. In addition, in the above embodiment, the time measurement values of the molten metal are output in the form of a list together with the electrode numbers, but the mold 1
Alternatively, a longitudinal section and/or a cross section obtained by cutting the pouring space 2 at an appropriate number of points may be graphically displayed, and the time measurement value may be displayed or printed at each sensing electrode position on this graphic. good. Furthermore, the molten metal flow distance between adjacent detection electrodes 12 may be input into the time measurement device 14, and the flow velocity of molten metal between each detection electrode may be calculated and output based on the time measurement value. . Further, in the above embodiment, the common electrode 10 and the start voltage ! 11 is provided near the upper end of the sprue 3, but these may be provided near the connection portion between the runner 4 or the weir 5 and the casting space 6.

As explained above, according to the present invention, it is possible to quantitatively understand the molten metal flow situation in the mold, and it is possible to reliably and easily obtain molten metal flow data useful for determining a casting plan, and to prevent the occurrence of casting defects. It greatly contributes to prevention.

[Brief explanation of drawings]

FIG. 1 is an equipment connection diagram of a molten metal flow testing apparatus showing an embodiment of the present invention, and FIG. 2 is a horizontal cross-sectional view of the central part of the mold shown in FIG. 1. 1.Mold, 2.Pouring space, 10.Common electrode, 1
1. Start electrode, 12. Detection electrode, 13. Continuity detection circuit, 14. Time measuring device, 15.-Output device, 15a.. Display, 15b.. Printer. Applicant Daido Steel Co., Ltd. Agent Akira Inui JI L Kuchimen No. 10

Claims (1)

[Claims] a plurality of detection electrodes disposed with their tips exposed in the pouring space of the mold; a common electrode and a start electrode disposed with their tips exposed in the pouring space upstream of the molten metal from the detection electrodes; , a conductor connected to each of the above electrodes that detects continuity between the common electrode and the start electrode and issues a start signal, and also detects continuity between the common electrode and each of the detection electrodes and issues an electrode number signal and a continuity signal. a detection circuit, a time measuring device connected to the continuity detection circuit and measuring the time from the input of the start signal to the input of each of the continuity signals and storing the time measurement value together with the electrode number; connected to the measuring device and the time a+I
A casting product flow testing device comprising an output device for outputting data stored in a constant device.