JPH0712538B2 - Gravity tilt mold casting machine and its control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gravity type tilting mold casting machine using an upper and lower molds that can be opened and closed and tilted, in which molten metal is injected by using gravity, and a control method thereof. In particular, the present invention relates to a gravity type tiltable die casting machine which is excellent in workability and has a short cycle time, and a control method thereof.

[0002]

2. Description of the Related Art Gravity-type tilting molds using an upper and lower molds that can be opened and closed and can be tilted, in which molten metal is injected by using gravity, mainly for casting aluminum parts such as intake and exhaust manifolds. Casting machines are known.

For example, as shown in FIG. 1 and FIG.
Upper and lower movable die plates 10U, 10L to which upper and lower molds (not shown) are fixed, and upper and lower fixed die plates 12U for holding the upper and lower movable die plates 10U, 10L so that they can move forward and backward respectively. , 12L
And the upper fixed die plate 12U and the lower fixed die plate 12L are connected, and the upper movable die plate 10U and the lower movable die plate 10L are slidable and fixed to the upper fixed die plate 12U. And a mold clamping hydraulic cylinder (hereinafter, referred to as a mold clamping cylinder) for linearly moving the upper movable die plate 10U along the tie bar 1
6, and a pin-extruding hydraulic cylinder for extruding the product formed in the mold through an extruding pin 28L fixed to the lower fixed die plate 12L and fixed to a pin extruding plate 27L (see FIG. 3) ( Hereinafter, referred to as a pin pushing cylinder) 18 and side surfaces of the upper and lower fixed die plates 12U and 12L are fixed, and the boat-shaped frame 24 is tiltable with respect to the base 20 about a horizontal rotation axis 22. And a frame tilt hydraulic cylinder (hereinafter referred to as a tilt cylinder) 26 for tilting the boat-shaped frame 24 with respect to the base 20.

The lower die (hereinafter referred to as the lower die) 30L fixed to the lower movable die plate 10L has a structure shown in FIG.
Further, as shown in detail in FIG. 4, the molten metal to be poured into the cavity 32 formed in the mold and having a shape corresponding to the shape of the product, such as a weir, an oil passage, and a riser, is temporarily added. A pot 34 for storing is provided. This pot 3
Reference numeral 4 is made of metal such as an iron plate, and a refractory material such as putty is attached to the inner surface thereof.

In FIG. 3, reference numeral 29 designates pin passages 31U, 3L by urging the pin push-out plates 27U, 27L in directions away from the cavity 32.
The coil springs 36U and 36L for retracting the pushing pins 28U and 28L in 1L into the mold are the upper mold 30
U and lower mold 30L, upper fixed die plate 1 respectively
2U, a mold flange used when fixing to the lower fixed dive plate 12L.

In such a gravity type tilting die casting machine, as shown in FIGS. 1 and 2, the boat-shaped frame 24 is erected by the tilting cylinder 26 and the mold clamping cylinder 16 is contracted to the upper portion in the horizontal state. With the space between the movable die plate 10U and the lower movable die plate 10L opened in parallel, a shell core or the like is set in the mold from between the tie bars 14.

Next, the mold clamping cylinder 16 is extended and the movable die plate 10U is pushed down to close the mold.

Next, after pouring the molten metal into a horizontal pot 34 attached to the rear of the lower die 30L, the tilting cylinder 26 is driven to rotate the boat-shaped frame 24 as a rotating shaft as shown by an arrow in FIG. It is rotated by 90 ° around 22 to be in a horizontal state so that the molten metal in the pot is poured by gravity into the mold which is in a standing state from the horizontal state.

After the casting is completed, the tilting cylinder 26 returns the boat-shaped frame 24 to the standing state shown in FIG. 2 again, and the mold clamping cylinder 16 opens the upper movable die plate 10U and the lower movable die plate 10L in parallel, and The push-out cylinder 18 causes the push-out pin 28L to project into the mold to take out the product in the mold.

[0010]

However, in such a conventional gravity type tilting die casting machine, since the upper and lower die plates are connected by the tie bar 14, the gap between the horizontal die and It is necessary to set the shell core and the like from between the tie bars 14 and take out the product sideways, which is not only poor in workability but also difficult to automate the product taking-out work. Further, there is a problem that a lot of manual work is required and the cycle time cannot be shortened.

The present invention has been made to solve the above-mentioned conventional problems, and provides a gravity type tilting die casting machine which is excellent in workability and can shorten cycle time, and a control method thereof. The purpose is to do.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to a gravity type tilting die casting machine using an upper and lower molds that can be opened and closed and tilted, in which molten metal is injected by utilizing gravity. Upper and lower die plates to which the respective molds are fixed,
A die clamping means for moving at least one of the upper die plate and the lower die plate, a body frame to which the die clamping means is fixed, and which is tiltable about a horizontal axis with respect to a base, Body frame tilting means for tilting the body frame, and die tilting means for tilting at least one of the upper and lower die plates about the same horizontal axis as the body frame. The above-mentioned object is achieved by including.

In controlling the gravity type tiltable die casting machine, first, with the main body frame erected, the upper die plate is erected to open the upper die by about 90 ° and the horizontal state. Retract the lower die plate downwards,
In a standby state in preparation for casting preparation work, then tilt the upper die plate to a horizontal state, raise the lower die plate, close and clamp the upper and lower molds,
After the molten metal is poured into the pot attached to the lower mold, the body frame is tilted horizontally so that the molten metal in the pot is poured into the standing mold by gravity. After completion, with the lower die plate standing upright and retracting backward, tilt the upper die plate horizontally to open the mold, and push the extrusion pin downward from the upper mold to drop the casting, The object is also achieved by tilting the main body frame to the upright state and returning it to the standby state with the mold opened at about 90 °.

[0014]

According to the present invention, in the gravity type tiltable die casting machine, the diver and the fixed die plate are omitted, and the die plate can be tilted independently of the tilting operation of the main body frame. Alternatively, the lower part can be completely opened.
Therefore, the product can be taken out from below, and the workability is improved. Further, the preparation work for the shell core set and the like can be performed quickly and easily, and the cycle time can be shortened.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 5 is a front view showing a state in which the mold is closed in this embodiment, FIG. 6 is a plan view thereof, FIG. 7 is a side view thereof, and FIG.
[Fig. 3] is a side view of a main part showing a state where a mold is opened.

In this embodiment, as shown in FIGS. 5 to 8, a gravity-type tiltable metal mold using upper and lower molds 30U and 30L that can be opened and closed and tilted into which molten metal is injected by using gravity. In the mold casting machine, upper and lower die plates 40U and 40L to which upper and lower molds 30U and 30L are fixed, respectively,
Upper and lower pushing (hydraulic) cylinders 42U and 42L fixed to the upper and lower die plates 40U and 40L, respectively, and for moving the lower die plate 40L in the vertical direction of the drawing along a linear bearing 44. A mold clamping (hydraulic pressure) cylinder 46 and a body frame 54 to which the mold clamping cylinder 46 is fixed and can be tilted with respect to a base 50 around a horizontal rotation axis 52.
And a body frame tilting (hydraulic pressure) cylinder 56 for tilting the body frame 54 around the rotation axis 52,
An upper die tilt (hydraulic pressure) cylinder 58 for tilting the upper die frame 59 (see FIG. 7) to which the upper die plate 40U is fixed around the same horizontal rotation axis 52 as the main body frame 54. , Mainly.

The upper and lower molds 30U and 30L as shown in FIGS. 3 and 4 are the upper and lower die plates 40.
For example, two swing mold dies clamps 60 are provided at both ends of the U and 40L, for example, using air pressure.
U and 60L are fixed to the upper and lower die plates 40U and 40L by utilizing the flanges 36U and 36L.

The push-out cylinders 42U and 42L are
The upper and lower die plates 40U and 40L are fixed to the upper and lower die plates 40U and 40L via mounting posts 62U and 62L and mounting plates 64U and 64L, respectively. A push-out plate 68 in which push-out pins 66U and 66L are set up at the tips of the pistons of the push-out cylinders 42U and 42L.
U and 68L are fixed, and the push pin 66U and
The tip of 66L is the pin push plate 27 attached to the mold.
By pushing the surfaces of U and 27L (see FIG. 3), the push pins 28U and 28L attached to the mold project into the cavity 32 of the mold.

The main frame 54 has the mold clamping cylinder 46 fixed on its surface, and the upper mold tilting cylinder 58.
Is composed of a cylinder mounting plate 54P fixed to the back surface and substantially L-shaped arms 54A fixed to both sides of the plate 54P in a U shape.

An upper die floating prevention clamp 70 is fixed to the upper end of the arm 54A. As shown in detail in FIG. 9, the upper die floating prevention clamp 70 includes a receiving metal 72 attached to an upper surface of an end portion of the upper die plate 40U,
The rod 74 is attached to the main body frame 54, and the rod 74 slides and protrudes when the die is closed, and includes a cylinder 76 that mechanically clamps the tip of the receiving metal 72. The upper mold 30U is mechanically clamped so as to prevent its rising.

The base 50 is a square-shaped base portion 5.
0B and a post portion 50P that is erected from the base portion 50B in a U shape to support the rotating shaft 52, and the lower end of the main body frame tilting cylinder 58 is located on the base portion 50B. It is fixed. The tip of the piston of the body frame tilting cylinder 58 is attached to the body frame 54.
Is locked to the upper end of the arm 54A, and the main body frame 54 is tilted by the expansion and contraction of the main body frame tilt cylinder 58.

The upper die frame 59 is composed of the upper die plate 40U and plates 59P fixed to both sides thereof in a U shape, and as shown in FIG. The tip of the piston of the upper tilt cylinder 58 fixed to the back surface of the plate 54 is
It is locked to 9P.

The operation of the embodiment will be described below.

When casting is started, first, as shown in FIG. 10, with the main body frame 54 standing, the piston of the upper tilt cylinder 58 is pulled in, so that the arrow A
As shown in FIG.
The upper die plate 40U is erected upright to open the upper die by approximately 90 °, and the lower die plate 40L in the horizontal state is retracted downward by pulling in the piston of the die clamping cylinder 46 as shown by arrow B. Then, prepare for the casting preparation work. In this state, the upper mold is upright and the lower mold is retracted downward, so the upper part of the lower mold is completely opened, and the operator can easily put the shell core etc. in the lower mold. Can be set.

Then, the piston of the upper die tilting cylinder 58 is pushed out to tilt the upper die plate 40U to the horizontal state as shown by arrow C in FIG. The lower die plate 40L is lifted by pushing out the piston, and the upper die 30U and the lower die 30
Close L completely. At this time, the upper die floating prevention clamp 70 is operated to reliably maintain the closed state of the die.

The upper die lifting prevention clamp 70 of this embodiment
Is inexpensive because it is a slide type and has a simple structure, and it may occupy a small space. On the other hand, conventionally, the system has been adopted in which the hydraulic pressure of the mold clamping cylinder is increased or the pin is inserted from the side and locked. Therefore, the former method of directly pressing with a cylinder or the like requires a large structure,
Not only is it expensive, but it also requires space. Further, in the latter method of inserting the pin from the side, the mold temperature also rises to about 400 ° C. due to the oil temperature of aluminum (730 ° C.), so if the clearance is small, it will not come out due to thermal expansion. On the other hand, if the clearance is too large, there is a problem that the molten metal leaks.

In this embodiment, since the upper die was capable of tilting, the slide type lifting prevention clamp was provided on the upper die, but the position to attach this clamp is not limited to this. For example, in the case of a casting machine that tilts the lower mold, the lower mold may be provided with a mold floating prevention clamp. The clamp type is not limited to the slide type, and may be a swing type.

Here, after the upper mold is tilted by 90 °, the lower mold is raised and closed. However, a pin (not shown) for aligning the upper mold and the lower mold can be inserted. This is because

After the upper die and the lower die are clamped, the molten metal is poured into a pot 34 (see FIGS. 3 and 4) attached to the rear of the lower die in a horizontal state.

Then, with the upper die and the lower die clamped, the body frame tilting cylinder 56 tilts the body horizontally as indicated by arrow E in FIG. 11, so that the molten metal in the pot is Gravity injection into the standing mold.

The main body is left in a horizontal state to wait until the molten metal is cooled and the casting is completed.

After the casting is completed, first, as shown by an arrow F in FIG. 11, the piston of the mold clamping cylinder 46 is contracted to retract the lower die plate 40L rearward in an upright state, and the alignment pin is pulled out. At this time, the lower die plate 4 is protruded by the lower die push pin 28L as shown in FIG.
By retracting 0L to the rear, the upper mold 30U can be reliably
The product 84 can be left behind. In contrast, conventionally,
I tried to push the pin out when the mold was closed and attach the product to the other side, but there was a lack of certainty and there was a problem in automation of product removal.

The reverse can be done by reversing the upper and lower molds.

Then, as shown by an arrow G in FIG. 13, the upper die tilt cylinder 58 tilts the upper die plate 40U horizontally to open the mold.

Then, the extrusion pin 28U is projected downward from the upper die to drop the casting, and the casting is received and removed by a pan 90 on a pantograph type elevator, for example.

Then, while the mold remains open by approximately 90 °, the main body frame tilting cylinder 56 tilts the main body to the upright state and returns to the standby state shown in FIG.

In this embodiment, since the upper die floating prevention clamp 70 prevents the die from rising without using pins or a large hydraulic cylinder,
It has a simple structure, is inexpensive, and saves space.

Further, the main frame and the upper mold are made of the same rotary shaft 52.
Since it is tilted around, the relative position of the main body frame and the upper mold does not change even when tilted, and control is easy. or,
It has the smallest turning range and saves space.

Further, in this embodiment, since the upper and lower molds are opened by the protrusion of the lower mold pushing pin 28L, the product can be surely left in the upper mold.

Although the upper die plate is tiltable and the lower die plate moves straight in the above embodiment, the type and direction of movement of each die plate is not limited to this. For example, the lower die plate can be tilted, the upper die plate can be moved straight,
Alternatively, both the upper and lower die plates can be tiltable.

[0042]

As described above, according to the present invention, the tie bar and the fixed die plate of the gravity type tiltable die casting machine are omitted, and the die can be tilted independently of the rotation of the main body frame. As a result, the product can be taken out from the bottom, improving workability. Further, since the upper part of the mold is opened, preparation work is facilitated and cycle time can be shortened, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of an example of a conventional gravity type tilting die casting machine.

FIG. 2 is a side view of the same.

FIG. 3 is a side view showing a configuration of upper and lower molds and a mounting state on a die plate.

FIG. 4 is a plan view showing an example of a lower mold shape with a pot attached.

FIG. 5 is a front view showing a state in which the mold is closed in the embodiment of the gravity type tiltable mold casting machine according to the present invention.

FIG. 6 is a plan view of the same.

FIG. 7 is a side view of the same.

FIG. 8 is a side view of an essential part showing a state in which the mold is opened in the above embodiment.

FIG. 9 is a front view showing the configuration of an upper die floating prevention clamp used in the above-described embodiment.

FIG. 10 is a side view showing a standby state in the embodiment.

FIG. 11 is a side view showing a state where molten metal is poured into the mold by gravity.

FIG. 12 is a side view of the mold showing a state in which the mold is also opened by the push pin.

FIG. 13 is a side view showing the same product removal state.

[Explanation of symbols]

 28U, 28L ... Extrusion pin 30U, 30L ... Mold 32 ... Cavity 34 ... Pot 40U, 40L ... Die plate 42U, 42L ... Extrusion hydraulic cylinder 44 ... Linear bearing 46 ... Mold clamping hydraulic cylinder 50 ... Base 52 ... Rotating shaft 54 ... Main body frame 56 ... Main body frame Tilting hydraulic cylinder 58 ... Upper mold tilting hydraulic cylinder 59 ... Upper mold frame 70 ... Upper mold lifting prevention clamp 84 ... Product 90 ... Saucepan

Claims (4)

[Claims] 1. A gravity type tilting mold casting machine using an upper and lower molds which can be opened and closed and tilted, in which molten metal is injected by utilizing gravity, and an upper part to which the upper and lower molds are fixed, respectively. And a lower die plate, a mold clamping means for moving at least one of the upper die plate and the lower die plate, and the mold clamping means are fixed, and can be tilted about a horizontal axis with respect to the base. A main body frame, a main body frame tilting means for tilting the main body frame, and at least one of the upper and lower die plates for tilting about the same horizontal axis as the main body frame. A tilting die casting machine of the gravity type, characterized by comprising: 2. The gravity type tilting die casting according to claim 1, further comprising a die lifting preventing clamp for mechanically preventing the lifting of the die during pouring of the molten metal. Machine. 3. When controlling the gravity type tilting die casting machine according to claim 1, first, with the body frame standing, the upper die plate is raised to open the upper die by about 90 °. At the same time, the lower die plate in the horizontal state is retracted downward to be in a standby state in preparation for the casting preparation work, and then the upper die plate is tilted to be in the horizontal state,
Raise the lower die plate to close and clamp the upper and lower molds, and after the molten metal is poured into the pot attached to the lower mold, tilt the body frame horizontally to melt the molten metal in the pot. However, after the casting is completed, the lower die plate is evacuated backwards while standing upright, and the upper die plate is tilted horizontally to open the die. , Characterized in that the extrusion pin is projected downward from the upper die to drop the casting, and the body frame is tilted to the upright state and returned to the standby state while the die remains open at about 90 °. Control method of gravity type tilting die casting machine. 4. The gravity type tilting mold according to claim 3, wherein when the mold is opened after the casting is completed, the lower die plate is retracted backward by the protrusion of the lower product pushing pin. Casting machine control method.