JPH0543978Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention relates to a measuring device for measuring the injection force when injecting molten metal poured into the injection sleeve of a die-casting machine into a cavity. be.

<Prior art> When measuring the injection force in a die-casting machine,
Conventionally, the pressure (hydraulic pressure) applied to the head side of the injection cylinder was an indirect measurement that considered the injection force.
As a result of the injection force being transmitted to the head side of the injection cylinder through many parts from the plunger tip to the plunger rod, coupling, and injection cylinder rod, not only is the response slow, but the sliding resistance on the piston of the injection cylinder is also added to the injection force. There was a problem that the injection force could not be measured accurately.

Therefore, a method was proposed to measure the injection force by attaching a strain gauge to the outer surface of the plunger rod, but this measurement method also injects the force in the bending direction (the force that attempts to bend the plunger rod). Since the measurement is performed in addition to the output, there was a problem in which highly accurate measurements could not be expected.

<Problem to be solved by the invention> The present invention was made in view of the above-mentioned conventional problems, and is a die-casting machine that can accurately measure the injection force each time the molten metal in the injection sleeve is injected. The present invention aims to provide an injection force measuring device for use in the present invention.

<Means for Solving the Problems> The injection force measuring device for a die-casting machine of the present invention that achieves the above object is provided with a coupling connecting flange of a plunger rod which is connected to an injection cylinder rod via a coupling. The pressure sensing part is constructed by alternately arranging a large number of parallel parallel parts in the axial direction of parallel parts and thin flat plate parts, each of which is formed by penetrating four round holes in the shape of a parallel grid so as to surround the axis of the part. At the same time, a recess is formed on the rear end surface of the coupling flange, and a measuring element is disposed within the recess for extracting the amount of deformation of the pressure sensing portion using an electric signal. It is.

<Example> Hereinafter, an example of implementing the present invention will be described using an illustrated example applied to a horizontal mold clamping/lateral injection type die casting machine.

In the figure, 1 is an injection sleeve installed horizontally in a fixed platen 3 that holds a fixed mold 2, 4 is a plunger tip fitted into the injection sleeve 1 so as to be able to move forward and backward, and 5 is a plunger rod that supports the plunger tip 4. , 6 indicate a coupling for connecting the plunger rod 5 and the injection cylinder rod 8.

The coupling connecting collar 5a of the plunger rod 5, that is, the coupling connecting collar 5a of the plunger rod 5, which is connected to the rod 8 of the injection cylinder 7 via the coupling 6, includes:
A pressure sensing section 9 is configured, and a measuring element 10 for extracting the amount of deformation of the pressure sensing section 9 as an electrical signal is installed and arranged.

The pressure detection unit 9 is directly connected to the coupling connecting flange 5a of the plunger rod 5 through a large number of round holes 11a,
11b... are arranged in a perforated arrangement. That is, as shown in FIG. 3, the coupling connecting flange 5a
There are four round holes 11a, 1 surrounding the axis.
1a, 11b, 11b are formed in a cross-shaped shape to form a parallel cross-shaped part 9a, and this parallel cross-shaped part 9a is connected to the round hole 1.
1a, 11a, 11b, and 11b are arranged in parallel in the axial direction alternately with thin flat plate portions 9b that are not formed.

At this time, in order to concentrate the injection force acting on the plunger rod 5 on the axis of the coupling connecting flange 5a, as shown in FIGS. 11a, 11a
It is preferable that the distance between the two round holes 11b and the distance between the round holes 11b in the vertical direction become gradually narrower toward the rear end surface 5a' of the coupling connecting flange 5a.

Further, as the measuring element 10, for example, a strain gauge (the example shown in FIG. 2) or a piezoelectric element (the example shown in FIG. The signal cable 13 is installed in the recess 12 and electrically connected to the signal cable 13. In addition, the signal cable 13 is
The cable is led out of the coupling ring 6 through the cable lead-out groove 14 and the cable lead-out hole 15.

The molten metal poured into the injection sleeve 1 is then transferred to the cavity 1 by the plunger tip 4 via the plunger rod 5 by the operation of the injection cylinder 7.
When the injection force (injection force) is injected into the plunger rod 6, the force (injection force) is transmitted to the pressure sensing portion 9 formed on the coupling connecting collar 5a of the plunger rod 5. Then, the thin flat plate portions 9b of each cross-shaped portion 9a constituting the pressure sensing portion 9 are deformed in accordance with the injection force, and the amount of deformation is reflected by the measuring element 10 disposed within the recess 12.
This is then extracted as an electrical signal and measured as the injection force.

The principle of pressure detection by the pressure detection section 9 is known, for example, from Japanese Patent Laid-Open No. 61-41939.

<Effects of the invention> Since the injection force measuring device for the die-casting machine of the invention is configured in this way, all the forces applied to the plunger tip during the injection operation (gate resistance of the molten metal, sliding resistance of the plunger tip, after filling is completed) The pressure applied to the molten metal, etc.) can be intensively received by the pressure detection section configured in the coupling connecting flange of the plunger rod. Therefore, each time the molten metal in the injection sleeve is injected, it is possible to measure and output the pressure change from the start of injection to the completion in real time, and it is almost unaffected by the force in the bending direction applied to the plunger rod. As a result, the injection force can be measured with high accuracy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially cutaway front view, Fig. 2 is an enlarged sectional view of the main part, Fig. 3 is a sectional view taken along the line - - of Fig. The figure is an enlarged sectional view of main parts showing another embodiment. In the figure, 1... injection sleeve, 4... plunger tip, 5... plunger rod, 6... coupling, 5a... coupling connecting flange, 7...
...Injection cylinder, 8...Injection cylinder rod, 9
. . . Pressure detection portion, 9a . . . Cross-shaped portion, 9b .

Claims (1)

[Scope of utility model registration request] The coupling connecting flange of the plunger rod, which is connected to the rod of the injection cylinder via the coupling, has a cross-shaped part and a thin wall formed by four round holes penetrating the flange so as to surround the axis of the flange. forming a pressure sensing part configured by arranging a large number of flat plate parts alternately in parallel in the axial direction, and forming a recessed part on the rear end surface of the coupling connecting collar part,
An injection force measuring device for a die-casting machine, characterized in that a measuring element for extracting the amount of deformation of the pressure sensing portion by an electric signal is disposed in the recess.