JP2000000651A - Device for judging clamping of dies - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable judging whether the clamping condition of dies for casting is good or not, with high accuracy. SOLUTION: For an inside slide die D3, outside slide die D4, left side slide die D5 and right side slide die D6 which clamp a die D1, air passages 21 opened on these mating surfaces 22 are formed and pressure sensors 26 are connected with air pipings 24 for supplying high pressure air into these air passages 21 from air sources 24. When the gap between the mating surfaces 22 of the dies D is large, since the detected pressure is lowered by increasing the leakage quantity of the air from the mating surfaces 22, a sequencer 28 is judged as bad clamping condition of the dies. Since the die clamping condition is judged based on size of the gap between the mating surfaces 22 of the dies D, the suitable judgement can always be executed without affecting to factors, such as the change of kind of the die D, minute displacement of fitting place of the die D, thermal expansion of the die D.

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 the lower die by a cylinder from a lateral direction. 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. Because the position may change slightly, and the amount of thermal expansion of the mold and cylinder changes depending on the mold temperature and the outside air temperature, it is difficult to avoid erroneous detection with the conventional one using the limit switch. There was a problem.

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]

Means for Solving the Problems In order to achieve the above-mentioned object, the invention according to claim 1 is directed to an air passage formed in a mold and opening to a mating surface of the mold, and an air source formed by the air source. An air pipe for supplying high-pressure air to the air passage;
A pressure detecting means for detecting a pressure of the air pipe, and a judging means for judging a mold clamping state of the mold based on the pressure detected by the pressure detecting means are provided.

According to the above configuration, when high-pressure air from an air source is supplied to the mating surface of the mold through the air pipe and the air passage, if the mold is not properly clamped, it is determined from the mating surface of the mold. Since the amount of air leakage increases and the pressure detected by the pressure detecting means decreases, the determining means determines a failure in the mold clamping state. As described above, since the mold clamping state is determined based on the size of the gap between the mating surfaces of the molds, factors such as a change in the type of the mold, a subtle error in the mounting position of the mold, and thermal expansion of the mold. An appropriate determination can always be made without being affected. Moreover, since the pressure detecting means can be constituted by a non-contact type which does not directly contact the mold or the like, the influence of a bad environment such as heat and dust can be minimized.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the air source is for supplying cooling air to a mold.

According to the above configuration, since the mold closing state of the mold is determined using an air source for supplying cooling air to the mold, a special air source is not required, and the equipment cost is reduced. Be reduced.

[0010]

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 3 show an embodiment of the present invention. FIG. 1 is a side sectional view of a cylinder head casting apparatus, FIG. 2 is a view taken along line 2-2 of FIG. 1, and FIG. 2 is an enlarged view of a main part of FIG.

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.

A lower mold D ₁ is fixed on the upper surface of a lower base 1 of the cylinder head casting apparatus. An upper mold D ₂ which can approach / separate from the lower mold D ₁ from above is attached to the upper base 2. , And is driven up and down by a cylinder (not shown). Also so as to surround the front, back, left and right of the lower mold D _1, inner slide type D _3, the outer slide D _4, close the left slide D ₅ and right slide guide D ₆ is relative to the lower die D ₁ / away capable Be placed.

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.

[0016] As shown in FIG. 3, four air passages 21 ... end of which is formed to penetrate the left side sliding type D ₅ and right slide guide D ₆ is, inner slide type D
_{3. The} outer slide type D ₄ , the left slide type D _5, and the right slide guide D ₆ are connected so as to be orthogonal to the mating surfaces 22. The other end of each air passage 21 is connected to one end of an air pipe 24 via a joint 23, and the other end of the air pipe 24 is connected to an air source 25. As the air source 25, an air source provided to supply cooling air to the mold D is used. This eliminates the need to provide a special air source 25, thereby suppressing an increase in equipment cost. Air pipes 24 are joints 2
3 and is connected to the mold D, so that the mold D can be easily exchanged.

Pressure sensors 26 for detecting the internal pressure are connected to the respective air pipes 24, and these pressure sensors 26 are connected to a sequencer 28 which constitutes a judgment means of the present invention via a pressure controller 27. The sequencer 28 outputs an OK determination signal to the pouring machine 29 if the inner slide type D ₃ , the outer slide type D ₄ , the left slide type D _5, and the right slide guide D ₆ are all in a good mold clamping state. To the mold D, the inner slide D ₃ , the outer slide D
_4, the left slide D ₅ and right slide guide D ₆
If any of the mold clamping states is poor, the pouring machine 29
NG determination signal is output to prohibit pouring of the mold D.

When the mold D is clamped, high-pressure air is supplied from the air source 25 to the mating surfaces 22 of the mold D via the air pipes 24 and the air passages 21 before pouring. Then, the pressure of the air pipes 24 at that time is detected by the pressure sensor 26 and output to the sequencer 28. And if the mold clamping of the mold D is completed normally,
Since the gap between the mating surfaces 22 of the mold D is sufficiently small to reduce air leakage, the pressure sensors 26.
Is higher than a predetermined threshold. On the other hand, if the clamping of the mold D becomes poor due to foreign matter biting or the like, the gap between the mating surfaces 22 of the mold D becomes large and air leakage increases, so that the pressure detected by the pressure sensors 26. Becomes a value lower than the threshold value.

Therefore, the four pressure sensors 26...
By monitoring the pressure of the mold D, whether the mold D is properly clamped or not, and if the mold clamp is abnormal, the mold D
It is possible to determine in which part of the gap a gap is generated, and it is possible to reliably prevent the molten metal from leaking due to pouring while the mold clamping is poor.

As described above, the mold clamping state of the mold D is determined based on the amount of air leakage from the mating surfaces 22 of the mold D. The determination can be performed with higher accuracy than the conventional determination based on ON / OFF of the limit switch without being affected by a delicate error of the mounting position, thermal expansion of the mold D, or the like. . Since the pressure sensors 26 are non-contact sensors that do not directly contact the mold D, the heat of the mold D
It is possible to minimize the influence of dust, dirt, and the like, thereby preventing a decrease in detection accuracy.

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

[0022] For example, although in the embodiment the mold clamped state of the upper mold D ₂ is detected by the limit switch, similar inner slide type D _3, the outer slide D _4, a left slide-type D ₅ and right slide guide D ₆ a, it is possible to even the upper mold D ₂ applies the detection by the pressure sensor.

[0023]

As described above, according to the first aspect of the present invention, when high-pressure air from an air source is supplied to the mating surface of the mold through the air pipe and the air passage, the mold is clamped. If the state is poor, the amount of air leaking from the mating surface of the mold increases and the pressure detected by the pressure detecting means decreases, so that the determining means determines the failure in the mold clamping state. As described above, since the mold clamping state is determined based on the size of the gap between the mating surfaces of the molds, factors such as a change in the type of the mold, a subtle error in the mounting position of the mold, and thermal expansion of the mold. An appropriate determination can always be made without being affected. Moreover, since the pressure detecting means can be constituted by a non-contact type which does not directly contact the mold or the like, the influence of a bad environment such as heat and dust can be minimized.

According to the invention described in claim 2,
Since the mold clamping state of the mold is determined using an air source for supplying cooling air to the mold, a special air source is not required, and the cost of the equipment is reduced.

[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 main part of FIG. 2;

[Explanation of symbols]

 21 air passage 22 mating surface 24 air pipe 25 air source 26 pressure switch (pressure detection means) 28 sequencer (judgment means) D mold

Continued on the front page F term (reference) 4F202 AM19 AM32 AP02 CA11 CB01 CL09 CN05 CN12 CN22 4F206 AM19 AM32 AP02 JA07 JN43 JP13 JQ81

Claims (2)

[Claims] 1. An air passage (21) formed in a mold (D) and opening to a mating surface (22) of the mold (D), and a high pressure is applied from an air source (25) to the air passage (21). An air pipe (24) for supplying air; a pressure detecting means (26) for detecting the pressure of the air pipe (24); and the die (D) based on the pressure detected by the pressure detecting means (26). Determining means (28) for determining the state of mold clamping
And a mold closing determination device for a mold. 2. The mold closing determination device according to claim 1, wherein the air source (25) is for supplying cooling air to the mold (D).