JPH11320069A - Mold clamping decision apparatus for metal mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide whether the mold clamping state of metal molds for casting is defective or nondefective with high accuracy. SOLUTION: An L-shaped member 21 to be detected 21 is mounted at a guide rod 11 moving in a direction A-A' cooperatively with the opening and closing of the metal molds and a displacement sensor 25 of an eddy current system is arranged in a position facing the moving route of this member 21 to be detected. The surface 211 to be detected of the member 21 to be detected inclines by a prescribed angle θ with the direction A-A' described above. The positions of the metal molds in the mold clamping state are detected in accordance with the distance from the surface 211 to be detected which is detected by the displacement sensor 25. The output value of the displacement sensor 25 at the time of the completion of the mold clamping in a normal shot of the previous time and the output value of the displacement sensor 25 at the time of the completion of the mold clamping in the shot of this time are compared. If the deviation is below the prescribed threshold, decision is made that the mold clamping state of the shot of this time is nondefective.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold closing determining apparatus for determining whether or not a casting mold is securely closed.

[0002]

2. Description of the Related Art A fixed lower die, an upper die which can be approached / separated from above by a cylinder with respect to the lower die, and a front / rear and left / right which can be approached / separated from a lateral direction by a cylinder with respect to the lower die. A casting mold provided with a slide mold is known, for example, from Japanese Patent Publication No. 3-12993.

[0003] In such a casting mold, when the mold is incompletely clamped and the molten metal is poured into the cavity with a gap formed in the mating surface, the molten metal leaks from the gap to cause a casting defect. is there. Therefore, conventionally, when the upper mold and the slide mold have reached the mold clamping position, the corresponding limit switches are actuated to confirm the completion of the mold clamping of the mold.

[0004]

However, in general, a casting apparatus is capable of exchanging a plurality of types of dies. Each of the dies not only has a different size and shape, but also has a different type of die attached at the time of the exchange. In some cases, the position may slightly change, and the amount of thermal expansion of the mold or the cylinder changes depending on the mold temperature or the outside air temperature, so that it is difficult to avoid occurrence of erroneous detection.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to make it possible to determine with high accuracy whether or not a mold for casting is closed.

[0006]

In order to achieve the above-mentioned object, the invention described in claim 1 provides a member to be detected provided on a member which moves in conjunction with the opening and closing operation of a mold, and a member to be detected which is provided. A displacement sensor disposed so as to face the movement path of the member and capable of continuously detecting the displacement of the detected member; and determination means for determining a mold clamping state of the mold based on an output of the displacement sensor. It is characterized by having.

According to the above configuration, the displacement of the member to be detected, which moves in conjunction with the opening and closing operation of the mold, is continuously detected by the displacement sensor to determine the mold clamping state. Not only the accuracy of the determination is significantly improved as compared with the determination, but also the versatility for exchanging the mold can be improved.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the detected member has a detected surface which is arranged to be inclined with respect to the moving direction, and the displacement sensor is The distance to the surface to be detected is detected.

According to the above arrangement, the detected surface of the detected member detected by the displacement sensor is arranged inclined with respect to the moving direction of the detected member, so that the detected member moves in the moving direction. It is possible to arbitrarily set the ratio between the displacement and the displacement at which the detected surface of the detected member approaches / separates from the displacement sensor, thereby changing the detection characteristics of the displacement sensor.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the determining means includes an output value of the displacement sensor at the time of completion of the mold clamping in the previous shot and a mold clamping in the current shot. The clamped state of the mold is determined by comparing the output value of the displacement sensor at the time of completion.

According to the above configuration, the mold clamping state in the current shot is determined based on the output value of the displacement sensor at the time of completion of the mold clamping in the already completed shot.
The determination can be made with extremely high accuracy without being influenced by factors such as the type of the die, the error in the mounting position of the die, and the thermal expansion of the die.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 5 show one embodiment of the present invention. FIG. 1 is a sectional side view of a cylinder head casting apparatus, FIG. 2 is a view taken along line 2-2 of FIG. 1, and FIG. Enlarged view of part 3 of FIG. 2, FIG.
Is an explanatory diagram of the operation of the stroke detecting means, and FIG. 5 is a block diagram of a control system.

First, a schematic structure of a cylinder head casting apparatus will be described with reference to FIGS. The cylinder head casting apparatus simultaneously casts two cylinder heads and has a structure that is symmetrical in the front-rear direction with the center line L interposed therebetween.

On the lower base 1 of the cylinder head casting device
Lower D on the surface₁Is fixed, and this lower mold D₁Against
Upper die D that can approach / separate from above_TwoIs attached to the upper base 2
With a cylinder (not shown) supported through the
It is driven up and down. In addition, lower mold D ₁Around the front, back, left and right
And inside slide type D_Three, Outer slide type D_Four, Left
Ride type D_FiveAnd right slide guide D₆Is the lower mold
D₁Are arranged so that they can approach / separate from each other.

The inner slide type D ₃ and the connecting member 4 are connected via four connecting rods 5.
Output rod 7 of a pair of cylinders 7, 7 supported by a bracket 6, 6 provided on the _1, 7 with _one end is connected to the connecting member 4, the output rod 7 _1, 7 ₁ of the other end connecting member 7 Connected with _two . Therefore, the expansion and contraction of the pair of cylinders 7, 7, the inner slide D ₃ is driven so as to approach / away from the lower mold D _1. A cylinder 9 and a pair of slide guides 10, 10 are provided on a bracket 8 disposed between the pair of brackets 6, 6, and a pair of guide rods 11, slidably supported by the slide guides 10, 10. It is connected to the outer slide D ₄ 11 penetrates the coupling member 4, connected to the outer slide type D ₄ output rod 9 ₁ of the cylinder 9 through the connecting member 4. Therefore, by expansion and contraction of the cylinder 9, it approaches the outer slide type D ₄ is relative to the lower die D ₁ /
It is driven to separate.

A cylinder 13 and a slide guide 14 are supported by a bracket 12 provided on the lower base 1.
This slide guide 14 guide rod 15 which is slidably supported on the output rod 13 ₁ of the cylinder 13 is connected to the left slide die D _5. Similarly, a cylinder 17 and a slide guide 18 are supported by a bracket 16 provided on the lower base 1. A guide rod 19 slidably supported by the slide guide 18 and a cylinder 1
7 output rod 17 ₁ and is connected to the right slide die D _6. Therefore, by expansion and contraction of the cylinder 13 and 17, left slide D ₅ and the right slide die D ₆ is driven so as to approach / away from the lower mold D _1.

In order to determine the mold clamping state of the mold D, the inside
Ride type D_ThreeA pair of stroke detecting means corresponding to
S₁, S₁Is provided, and the outer slide type D_FourCorresponding to
A pair of stroke detecting means S_Two, S_TwoIs provided on the left side
Slide type D_FiveAnd right slide type D₆To each
Accordingly, the stroke detecting means S_Three, S_FourIs provided. each
Stroke detecting means S₁~ S_FourHas substantially the same structure
The outer slide type D_FourCompatible with
Stroke detecting means S provided as_Two, S _Twoof
One structure will be described.

As shown in FIG. 3, the tip of the guide rod 11 moves together with the outer sliding-type D ₄ by a cylinder 9, the detected member bending the metal plate in the schematic L-21
Are fixed with bolts 22. The detected face 21 ₁ of the detected member 21, (in the example 5 °) predetermined tilt angle θ with respect to the moving direction A-A 'of該被detection member 21 is inclined by. An eddy current type displacement sensor 25 fixed to the mounting stay 23 with nuts 24, 24 is disposed so as to face the movement path of the detected member 21. When the cylinder 9 extends and the outer slide mold D ₄ reaches the mold clamping position, the detected member 21 moves to a position shown by a chain line in FIG. 3 and faces the front of the displacement sensor 25.

Incidentally, the inner slide type D_ThreeStroke detection
Means S₁, S₁, Left slide type D _FiveStroke detection
Means S_ThreeAnd right slide type D₆Stroke detection hand
Step S _FourThe structure of the outer slide type D_FourStroke
Detecting means S_Two, S_TwoIs substantially the same as
The mounting locations of the projecting members 21 are different. That is, inside
Ride type D_ThreeStroke detection means S₁, S₁Detected
The members 21, 21 are the output rods 7 of the cylinders 7, 7.₁, 7
₁Of the left slide type D _Fiveand
Right slide type D₆Stroke detection means S_Three, S_Fourof
The detected members 21 and 21 are respectively connected to the guide rods 15 and
19.

As shown in FIG. 5, the outputs of the displacement sensors 25 of the six stroke detecting means S _{1 to} S ₄ are respectively amplified by amplifiers 26 and converted into analog voltages of 0 V to 5 V by an A / D converter 27. Is converted into a digital signal and input to the sequencer 28 constituting the determination means of the present invention. The sequencer 28 has an inner slide type D ₃ , an outer slide type D ₄ , and a left slide type D 3.
_If the mold clamping states of ₅ and the right slide mold D ₆ are all good, an OK determination signal is output to the pouring machine 29 to allow pouring of the mold D, and conversely, the inside slide mold D ₃ ,
If any of the outer slide die D ₄ , the left slide die D _5, and the right slide die D _{6 is in} a poorly-clamped state, an NG determination signal is output to the pouring machine 29 to perform pouring of the mold D. Ban.

[0022] Incidentally, the mold clamped state of the upper mold D ₂ is detected by a limit switch (not shown).

Next, the determination of the mold clamping state will be described with reference to FIG.

The detected member 21 is moved in the direction of arrow A with the mold clamping.
And the member to be detected 21 is
Position X₁At the stop, the displacement sensor 25
Sensor 25 and detected surface 21 of detected member 21₁Distance to
Y₁Is detected. In addition, the cause of foreign object biting
When the mold clamping state becomes poor in the above, the detected member 21 is
X₁Position X without being able to reach_TwoAt
The test is stopped and detected by the displacement sensor 25 at this time.
Surface 21₁And the distance is Y₁Y greater than _TwoNana
You. Therefore, the detected surface detected by the displacement sensor 25
21₁The quality of the mold clamping state based on the distance Y to
Can be

However, since there are various factors such as a change in the type of the mold D, a subtle error in the mounting position of the mold D, and thermal expansion of the mold D, the distance Y detected by the displacement sensor 25 is It is inappropriate to determine the quality of the mold clamping state based on For example, the detected distance Y is 2 m
Even if a criterion for determining that the mold-clamping state is good is set when m <Y <3 mm, the criterion also changes according to changes in the various factors. become unable.

Therefore, in this embodiment, the quality of the mold clamping state is determined by using the following methods (1) and (2). Distance Y detected when mold closing of the previous shot was completed
₀ is stored, and calculates the deviation Y-Y ₀ between the distance Y and the previous value Y ₀ detected at the time of mold clamping completion of this shot. If the absolute value | Y−Y ₀ | of the deviation Y−Y ₀ is equal to or smaller than a preset threshold δ, that is, | Y−Y ₀ | ≦
If δ holds, it is determined that the mold clamping state of the current shot is good. In this case, the condition is that the previous shot ends normally without any leakage of molten metal or the like. Distance Y detected at the completion of mold clamping of a predetermined number of shots (for example, 10 shots) before the previous shot
Are stored, and a value corresponding to a shot having the worst mold clamping state among the ten distances Y is selected as a selection value Y.
Select as _max . If the absolute value | Y- _Ymax | of the deviation between the distance Y detected at the time of completion of the mold clamping of the current shot and the selected value _Ymax is equal to or smaller than a predetermined threshold value δ, that is, | Y- _Ymax If | ≦ δ holds, it is determined that the mold clamping state of the current shot is good. In this case, it is a condition that the previous ten shots have been completed normally without the occurrence of molten metal leakage or the like.

The meaning of the selection value _Ymax will be described. In FIG. 4, the position of the detected member 21 at the time of completion of mold clamping shifts to the right with the deterioration of the mold clamping state. the distance Y that the detected face 21 ₁ of is detected apart from the displacement sensor 25 is increased. Therefore, the maximum value of the ten detected values corresponding to ten shots is the selected value _Ymax corresponding to the shot with the worst mold clamping state.

As described above, the quality of the mold clamping state of the current shot is determined based on the mold clamping state of the previous shot or a predetermined number of shots before the previous shot. Thus, an appropriate determination can always be made without being affected by factors such as a slight error in the mounting position and thermal expansion of the mold D.

In FIG. 4, when the detected member 21 stops at the solid line position X ₁ and the chain line position X ₂ , the relationship between the deviation ΔX in the X direction and the deviation ΔY in the Y direction is determined by Is represented by ΔY = ΔX tan θ. That is, 0 ° <θ <45 including θ = 5 ° in the embodiment.
°, the deviation ΔX in the Y direction relative to the deviation ΔX in the X direction
Y is detected after being reduced. Therefore, a larger stroke in the X direction can be detected using the displacement sensor 25 having a smaller detectable stroke. Conversely, 4
If 5 ° <θ <90 °, the deviation ΔY in the Y direction is detected to be larger than the deviation ΔX in the X direction. Therefore, high detection accuracy can be obtained even when the displacement sensor 25 having low detection accuracy is used. If θ = 45 °, the deviation ΔY in the Y direction relative to the deviation ΔX in the X direction is detected at the same ratio without being reduced or enlarged.

As described above, the displacement of the detected members 21 provided on the member moving in conjunction with the opening / closing operation of the mold D is continuously detected by the displacement sensors 25 to determine the quality of the mold clamping state. The limit switch is turned on.
The determination can be performed with higher accuracy than the conventional determination based on / OFF, and the versatility for exchanging the mold D can be enhanced. In particular, since the quality of the mold clamping state of the current shot is determined based on a shot that has already been completed normally, a change in the type of the mold D, a subtle error in the mounting position of the mold D, and a thermal expansion of the mold D The determination can be made with extremely high accuracy without being affected by factors such as the above.

Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.

For example, the members to which the members to be detected 21 are attached are not limited to those in the embodiment, but can be attached to any members that move in conjunction with the opening and closing operations of the mold D.
Although in the embodiment it is determined the quality of the mold clamped state of the upper mold D ₂ limit switch, the inner slide type D _3, the outer slide D _4, as with the left slide type D ₅ and right slide guide D ₆ It is possible to determine the quality of the mold clamping state by the stroke detecting means.

[0033]

As described above, according to the first aspect of the present invention, the displacement of the detected member, which moves in conjunction with the opening / closing operation of the mold, is continuously detected by the displacement sensor, and the mold is clamped. , So that not only the accuracy of determination is greatly improved compared to the one that
The versatility for exchanging molds and the like can be improved.

According to the second aspect of the present invention,
Since the detected surface of the detected member detected by the displacement sensor is arranged to be inclined with respect to the moving direction of the detected member,
It is possible to arbitrarily set a ratio between a displacement at which the detected member moves in the moving direction and a displacement at which the detected surface of the detected member approaches / separates from the displacement sensor, thereby changing the detection characteristics of the displacement sensor. it can.

According to the third aspect of the present invention,
Since the mold clamping state in the current shot is determined based on the output value of the displacement sensor at the time of mold clamping completion in the already completed shot, the type of the mold, the error in the mold mounting position, the thermal expansion of the mold, etc. The determination can be made with extremely high accuracy without being affected by the above factors.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a cylinder head casting device.

FIG. 2 is a view taken along line 2-2 of FIG. 1;

FIG. 3 is an enlarged view of a part of FIG. 2;

FIG. 4 is an explanatory diagram of an operation of a stroke detecting unit.

FIG. 5 is a block diagram of a control system.

[Description of Signs] 7 ₁ Output rod (member) 11 Guide rod (member) 15 Guide rod (member) 19 Guide rod (member) 21 Detected member 21 ₁ Detected surface 25 Displacement sensor 28 Sequencer (determination means) D Gold Type

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Hirata 1907 Hirata-cho, Suzuka City, Mie Prefecture Honda Motor Co., Ltd. Suzuka Factory

Claims (3)

[Claims] 1. A member _(71, 11,15,19) that moves in conjunction with opening and closing operation of the mold (D) and the detected member (21) provided in the movement of the detected member (21) A displacement sensor (25) arranged so as to face the path and capable of continuously detecting the displacement of the detected member (21); and a mold of the mold (D) based on an output of the displacement sensor (25). A mold closing determining device for a mold, comprising: determining means (28) for determining a closed state. 2. The member to be detected (21) has a surface to be detected (21 ₁ ) which is arranged to be inclined with respect to the moving direction, and the displacement sensor (25) is provided to the surface to be detected (21 ₁ ). The mold closing determination device according to claim 1, wherein a distance to the mold is detected. The determination means (28) is configured to determine an output value of the displacement sensor (25) at the time of completion of the mold clamping in the previous shot and an output value of the displacement sensor (25) at the time of completion of the mold clamping in the current shot. The mold closing determination device according to claim 1, wherein the mold closing state of the mold (D) is determined by comparing the mold closing conditions.