JP7206813B2 - VERTICAL SLEEVE SPRAYER AND METHOD FOR CONTROLLING MOLD RELEASE AGENT - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vertical sleeve spray device for applying a release agent to the inside of an injection sleeve of a vertical casting die casting machine, and a release agent application control method thereof.

A die casting machine is a device that casts a metal product of a desired shape by injecting and filling a mold cavity in a mold with molten metal (molten metal) and cooling and solidifying the metal. In general, the clamping direction of the mold clamping device (horizontal clamping/vertical clamping) that clamps the mold of the two-part structure with a predetermined mold clamping force, and the injection of the injection device that injects and fills the mold cavity with molten metal. There are various forms of die-casting machines depending on the combination of filling (casting) direction (horizontal casting type/vertical casting type).

Among these, a die casting machine having a vertical casting type injection device is mainly used for the squeeze casting method (molten metal forging method) using aluminum or its alloy as a material. In the squeeze casting method, the molten metal is injected and filled into the mold cavity at low speed and high pressure, unlike the usual die casting method in which molten metal is injected and filled into the mold cavity at high speed and medium pressure. Since the molten metal is injected and filled into the mold cavity at a low speed, there is little entrainment of gas such as air in the molten metal.In addition, since the pressurized filling time is long, castings with few internal defects and excellent mechanical properties are produced. can get. For this reason, the squeeze casting method is employed in the manufacture of aluminum wheels for automobiles, brake calipers, pressure-resistant parts for casings of anti-lock brake systems, and underbody parts such as suspension arms.

With reference to FIG. 1, an outline of an injection device of a vertical clamping/vertical casting die casting machine and a squeeze casting method will be described. FIG. 1 is a schematic side cross-sectional view of an upper end portion of an injection device and a die of a general vertical clamping/vertical casting type die casting machine.

A fixed mold (lower mold) 20 is attached to the upper surface of a fixed platen (not shown). A cavity 22 is molded. A movable platen is moved up and down by a mold clamping device (not shown) so that the movable mold 21 can be vertically opened, closed, and clamped with respect to the fixed mold 20 .

A vertical casting type injection device 1 is arranged at a predetermined distance below the stationary platen. An injection sleeve 10 is attached to the upper end portion thereof, and a plunger tip 11a is inserted into the injection sleeve 10 . The plunger tip 11a is attached to a plunger rod 11b via a tip joint (not shown), and the plunger 11 consisting of the plunger tip 11a and plunger rod 11b is coaxially attached to the cylinder rod of an injection cylinder (not shown). . The injection sleeve 10 and plunger 11 are detachably attached to the upper end portion of the injection device 1 and the injection cylinder, respectively, in order to replace them according to the casting weight. Note that FIG. 1 shows a state in which the injection sleeve 10 and the plunger 11 are in the injection standby position.

At the injection standby position, the plunger tip 11a is lowered downward with respect to the overall height of the injection sleeve 10 so as to block the opening at the lower end of the cylindrical injection sleeve 10, which is also at the injection standby position, Molten metal supplied (supplied) from a molten metal storage container 30 (ladle) of a hot water supply means (not shown) is supplied into the injection sleeve 10 (a hot water supply step). In order to facilitate the hot water supply process to the injection sleeve 10 by the hot water supply means, the injection sleeve 10 at the injection standby position is retracted from the lower projected area of the fixed mold (lower mold) 20 in the vertical casting die casting machine. Specifically, there is a form in which the entire injection device 1 including the injection sleeve 10 is horizontally moved to retract the injection sleeve 10 from the lower projection area of the fixed mold (lower mold) 20. 2, a tilting shaft is provided below the injection device, and a tilting mechanism such as a tilting cylinder disposed on the side of the injection device tilts the entire injection device about the tilting shaft, thereby forming an injection sleeve 10. In general, the part including the . The hot water supply process performed by tilting the injection device in this manner can be easily understood by referring to FIGS.

The injection sleeve 10 is attached to the upper end portion of the injection device 1 via a lifting means (not shown) that is independent of the injection cylinder. 11a (plunger 11) is integrally raised. Then, the upper end portion of the injection sleeve 10 is brought into contact (docked) with the injection hole 20a formed in the lower surface of the stationary mold 20 through a through hole (not shown) penetrating from the lower surface to the upper surface of the stationary platen. After that, the plunger tip 11a is slowly raised at a high pressure of 100 to 150 MPa or more and at a predetermined speed (80 to 500 mm/sec.), and the molten metal stored in the injection sleeve 10 is injected into the stationary mold 20. The mold cavity 22 is injected and filled through the gate portion 20b communicating between the hole 20a and the mold cavity 22 (injection step). In the second half of the injection process, even after the mold cavity is filled with the molten metal (injection is completed), the plunger tip 11a is raised appropriately according to the solidification shrinkage of the molten metal, while continuing to apply high pressure to the molten metal (pressure increase process). A two-dot chain line in FIG. Regarding the contact (docking) of the injection sleeve to the fixed mold and the injection process of such a vertical mold clamping/vertical casting type die casting machine, see FIGS. It is easy to understand by referring to it.

After cooling and solidification of the molten metal (cast product) in the mold cavity is completed, the movable mold 21 is opened upward by a mold clamping device (not shown), and released from the mold cavity surface of the movable mold 21 by an extrusion device (not shown). The casted product is conveyed out of the mold by product removing means (not shown) (product removing step). After that, a release agent application means (not shown) is inserted between the molds in the open state, and the release agent is applied to the mold cavity surfaces of the fixed mold 20 and the movable mold 21 (mold release agent application step ).

On the other hand, in the injection device 1, the injection sleeve 10 is lowered to be separated from the fixed mold 20, and the plunger 11 is lowered during the product extraction step and the release agent application step. After the injection sleeve 10 and the plunger tip 11a are lowered to the injection standby position, a release agent (for sliding lubrication of the plunger tip 11a) is applied to the inside of the injection sleeve 10 (sleeve release agent application step). Waiting for the release agent to dry, the hot water supply step of the next casting cycle is started.

Here, in order to perform a sleeve release agent application step of applying a release agent to the inside of the injection sleeve 10, the injection sleeve 10 lowered to the injection standby position is retracted from the lower projection area of the fixed mold (lower mold) 20. There is a need. As described above, generally, the entire injection device is tilted about the tilt axis, and the portion including the injection sleeve 10 is retracted from the lower projection area of the fixed mold (lower mold) 20. In this embodiment, the hot water supply position of the injection sleeve 10 and the release agent application position for applying the release agent to the injection sleeve 10 are often the same position.

In order to perform the sleeve lubricant application process as described above, a spray device (vertical sleeve spray device) as shown in Patent Document 2 is installed in the vicinity of the release agent application position of the vertical clamping/vertical casting type die casting machine. is placed. In such a vertical clamping/vertical casting die casting machine, the lowering of the injection sleeve to the injection standby position after completion of injection and the tilting operation of the injection device are described in FIG. and (e) for easy understanding. The process of applying the release agent to the injection sleeve at the release agent application position by the vertical sleeve spray device can be easily understood by referring to FIGS. 2(g) and (h) of Patent Document 2. be.

Further, in the sleeve release agent application step as described above, the amount of the release agent to be applied may be controlled for the purpose of controlling the temperature of the injection sleeve, as disclosed in Patent Document 3. .

JP-A-02-295661 JP-A-02-055653 Japanese Utility Model Laid-Open No. 64-049357

As in Patent Document 1 and Patent Document 2, when the entire injection device is tilted about the tilt axis and the portion including the injection sleeve is retracted from the lower projected area of the lower mold, the hot water supply position and mold release As described above, the agent application positions are often the same. In the case of this form, during hot water supply, when a molten metal holding container (ladle) pumped with molten metal from the furnace is brought close to the injection sleeve at the hot water supply position (for example, FIG. 2 (B) to (D) of Patent Document 1) ), in the vertical sleeve spray device, at least the part including the spray nozzle must be retracted from the vicinity of the injection sleeve at the hot water supply position (Fig. 2 (g) of Patent Document 2 reference).

On the other hand, during the sleeve release agent application process, the part including at least the spray nozzle of the vertical sleeve spray device is moved from the previously retracted position to the release agent application position (same as the hot water supply position). It is necessary to move the spray nozzle to a position directly above the sleeve and coaxial with the injection sleeve (see, for example, FIGS. 1 and 2 (h) of Patent Document 2).

Regarding the movement of the part including the spray nozzle directly above the injection sleeve at the release agent application position, the upward and downward stroke of the spray nozzle required to apply the release agent inside the injection sleeve , The retraction stroke of the spray nozzle to the extent that it does not become an obstacle when the molten metal holding container is approached is added as the lifting stroke of the spray nozzle, and the part including the spray nozzle is retracted from directly above the injection sleeve and further upward during hot water supply. It is also possible to make

However, in the case of this form, the total height of the vertical sleeve spray device is increased by the retraction stroke, and depending on the lifting speed and the number of times the lifting operation is switched when the spray nozzle is moved up and down in the injection sleeve, the lifting operation of the spray nozzle is affected. Due to the associated moment of inertia, etc., vibrations and the like occur in the vertical sleeve spray device. In addition, an increase in cost or the like occurs due to an increase in the device frame and device mounting rigidity for suppressing this.

Therefore, in the vertical sleeve spray device, it is common to move the portion including the spray nozzle toward and away from the injection sleeve directly above the release agent application position in a horizontal direction. . Therefore, the drive mechanism for such approach/retreat movement of the vertical sleeve spray device also had to be arranged in the horizontal direction (for example, FIG. 2(g) and (h) in Patent Document 2 ) moving cylinder 16). Therefore, in the vertical sleeve spray device, there is a problem that the size and area required for installing the vertical sleeve spray device are increased by the size of the drive mechanism arranged in the horizontal direction.

The present invention has been made in view of the above problems. It is an object of the present invention to provide a vertical sleeve spray device and a release agent application control method that are capable of arbitrary approach/retreat movement and control of the amount of release agent to be applied to the inside of an injection sleeve.

The above-described object of the present invention is to move the spray nozzle toward and away from the injection sleeve at the release agent application position, and move the spray nozzle up and down within the injection sleeve to apply the release agent to the inside of the injection sleeve. A vertical sleeve spray device,
a body frame erected parallel to the injection sleeve at the release agent application position;
a ball screw shaft that is rotatably supported above and below the main body frame and whose central axis of rotation is arranged parallel to the vertical sleeve;
a ball screw nut combined with the ball screw shaft;
a spray nozzle guide opening opened to the side of the body frame;
a spray nozzle support member configured to project from the ball screw nut to the side of the body frame so as to penetrate the spray nozzle guide opening and to support the spray nozzle to the side of the body frame; ,
a servomotor arranged on the body frame;
a rotation transmission mechanism for transmitting rotation of the servomotor to the ball screw shaft;
with
The spray nozzle guide opening is
a spray nozzle turning guide opening for guiding the spray nozzle support member and turning the spray nozzle support member around the ball screw axis via the ball screw nut;
a spray nozzle elevation guide opening that guides the spray nozzle support member and raises and lowers the spray nozzle support member in parallel with the ball screw shaft via the ball screw nut,
The ball screw shaft is rotationally driven by the servomotor to move the ball screw nut up and down within the body frame, thereby moving the through portion of the spray nozzle support member, which penetrates the spray nozzle guide opening, into the spray nozzle. guided by the nozzle guide opening,
a spray nozzle swiveling operation of moving the spray nozzle toward and away from the injection sleeve at the release agent application position in the spray nozzle swivel guide opening;
a spray nozzle elevating operation for elevating the spray nozzle within the injection sleeve at the spray nozzle elevating guide opening;
This is achieved by a vertical sleeve spray device characterized in that the

In the vertical sleeve spray device according to the present invention, the side surface of the body frame including at least the spray nozzle swirl guide opening may be formed in an arcuate cross-sectional shape that coincides with the center of the ball screw shaft.

Further, the above object of the present invention uses the vertical sleeve spray device according to the present invention to measure the temperature of the injection sleeve by means of temperature measuring means arranged at a predetermined position of the injection sleeve, and so that the temperature difference at the predetermined position for each casting cycle of the vertical sleeve after the completion of coating is within a predetermined range,
This is achieved by a release agent application control method that controls at least one of the release agent application time by the spray nozzle that moves up and down within the injection sleeve and the elevation speed of the spray nozzle.

In the vertical sleeve spray device according to the present invention, the spray nozzle is moved toward and away from the vertical sleeve at the release agent application position, and the spray nozzle is moved up and down within the vertical sleeve to A vertical sleeve spray device that applies a release agent to the inside of the sleeve,
a body frame erected parallel to the vertical sleeve at the release agent application position;
a ball screw shaft that is rotatably supported above and below the main body frame and whose central axis of rotation is arranged parallel to the vertical sleeve;
a ball screw nut combined with the ball screw shaft;
a spray nozzle guide opening opened to the side of the body frame;
a spray nozzle support member configured to project from the ball screw nut to the side of the body frame so as to penetrate the spray nozzle guide opening and to support the spray nozzle to the side of the body frame; ,
a servomotor arranged on the body frame;
a rotation transmission mechanism for transmitting rotation of the servomotor to the ball screw shaft;
with
The spray nozzle guide opening is
a spray nozzle turning guide opening for guiding the spray nozzle support member and turning the spray nozzle support member around the ball screw axis via the ball screw nut;
a spray nozzle elevation guide opening that guides the spray nozzle support member and raises and lowers the spray nozzle support member in parallel with the ball screw shaft via the ball screw nut,
The ball screw shaft is rotationally driven by the servomotor to move the ball screw nut up and down within the body frame, thereby moving the through portion of the spray nozzle support member, which penetrates the spray nozzle guide opening, into the spray nozzle. guided by the nozzle guide opening,
a spray nozzle swirling operation of moving the spray nozzle toward and away from the vertical sleeve at the release agent application position in the spray nozzle swirl guide opening;
a spray nozzle elevating operation for elevating the spray nozzle within the vertical sleeve at the spray nozzle elevating guide opening;
, any approach/retreat movement is possible without providing a horizontally arranged drive mechanism for the approach/retreat movement of the portion including the spray nozzle.

Further, in the release agent application control method according to the present invention, which uses the vertical sleeve spray device according to the present invention, the temperature of the injection sleeve is measured by a temperature measuring means arranged at a predetermined position of the injection sleeve. In addition, so that the temperature difference at the predetermined position in each casting cycle of the injection sleeve after the release agent is applied is within a predetermined range,
In order to control at least one of the release agent application time by the spray nozzle that raises and lowers the inside of the injection sleeve and the raising and lowering speed of the spray nozzle, it is possible to control the amount of the release agent that is applied inside the injection sleeve.

1 is a schematic cross-sectional side view of an upper end portion of an injection device and a mold of a general vertical clamping/vertical casting type die casting machine; FIG. 1 is a schematic side cross-sectional view of a vertical sleeve spray device according to a first embodiment; FIG. It is each arrow directional view (including a partial cross section) of FIG. 2 and others. FIG. 3 is a detailed view (including a partial cross section) and others of the main part X of FIG. 2; FIG. 5 is a schematic diagram showing another form of the body frame of the vertical sleeve spray device according to the first embodiment; FIG. 5 is a schematic diagram showing another form of guide rollers of the vertical sleeve spray device according to the first embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

[First embodiment]
A vertical sleeve spray device 40 according to a first embodiment of the present invention will be described with reference to FIGS. 2 to 4. FIG. FIG. 2 is a schematic side sectional view of the vertical sleeve spray device according to the first embodiment. In order to simplify the drawing, the illustration of the vertical clamping/vertical casting die casting machine is omitted, and only part of the injection sleeve, plunger tip, and plunger rod at the release agent application position are shown with two-dot chain lines. there is FIG. 2 shows the spray nozzle at its lower limit position. FIG. 3 is a view (including a partial cross section) and others in the direction of arrows in FIG. FIG. 3(a) is an AA arrow (cross section) view, FIG. 3(b) is a B arrow view (front view), and FIG. 3(c) is a C arrow view of FIG. 3(b). (side view). FIG. 4 is a detailed view (including a partial cross section) and others of the main part X of FIG. FIG. 4(a) is a detailed view of the main part X of FIG. 1, and FIGS. 4(b) and 4(c) show another form of FIG. 4(a). FIG. 4(d) is a view (front view) taken along line DD of FIG. 4(a).

First, referring to FIG. 2, the basic configuration of the vertical sleeve spray device 40 according to the first embodiment of the present invention will be described. An injection unit (not shown) of a vertical clamping/vertical casting type die casting machine (not shown) is tilted, and the injection sleeve 10, plunger tip 11a and plunger rod 11b (part) are moved to the release agent application position. there is

The vertical sleeve spray device 40 is fixed via a mounting base 61 to a machine base 2 of a vertical clamping/vertical casting type die casting machine, only a part of which is illustrated by a chain double-dashed line. The main frame of the vertical sleeve spray device 40 is composed of a tubular main body frame 41, an upper plate 42 that closes the upper part of the main body frame 41, and a lower plate 43 that closes the lower part of the main body frame 41. The main frame 41 contains a release agent. It stands parallel to the injection sleeve 10 at the coating position.

Inside the body frame 41, a ball screw shaft 44 is rotatably supported by an upper plate 42 and a lower plate 43 via an upper rotary support member 42a and a lower rotary support member 43a, respectively. Naturally, the central axis of rotation of the ball screw shaft 44 is arranged parallel to the injection sleeve 10, and the ball screw shaft 44 is combined with the ball screw nut 45. As shown in FIG.

In addition, as shown in FIG. 3B and FIG. A spray nozzle guide opening 46 is open. A spray nozzle supporting member 47 projecting from the ball screw nut 45 to the side of the body frame 41 so as to penetrate the spray nozzle guide opening 46 is used to apply a release agent to the inside of the injection sleeve 10 . A nozzle 49 is supported on the side of the body frame 41 .

On the other hand, a servomotor 50 is arranged above the upper plate 42 of the body frame 41 via a motor bracket 51 such that its output shaft is coaxial with the rotation center of the ball screw shaft 44 . The output shaft of the servomotor 50 and the upper end of the ball screw shaft 44 projecting upward from the upper rotation support member 42a of the upper plate 42 are connected via a coupling 52 as a rotation transmission mechanism. The rotary motion of the servomotor 50 can be transmitted to the ball screw shaft 44 .

Next, the operation of the spray nozzle 49 of the vertical sleeve spray device 40 according to the first embodiment of the invention will be explained. As shown in FIG. 3B, the spray nozzle guide opening 46 described above includes a linear spray nozzle elevation guide opening 46a opened on the side (peripheral surface) of the tubular body frame 41. , a curved spray nozzle turning guide opening 46b continuously opened from the upper end portion of the spray nozzle lifting guide opening 46a to above a position where the phase is shifted by approximately 90 degrees in the circumferential direction; Configured. The length (moving area) of the spray nozzle elevation guide opening 46a in the longitudinal direction of the main frame 41 is ST1. The movement angle (movement area) of the nozzle turning guide opening 46b in the circumferential direction of the main unit frame 41 is assumed to be ST2'.

In the above configuration, for example, as shown in FIG. 2, the ball screw shaft 44 is rotationally driven by the servomotor 50 so that the ball screw nut 45 moves upward from the state where the spray nozzle 49 is at the lower limit position. . At this time, the ball screw nut 45 combined with the ball screw shaft 44 also tends to rotate in the same direction. However, the rotation of the ball screw nut 46 is restrained by the spray nozzle support member 47 projecting from the ball screw nut 45 to the side of the body frame 41 so as to pass through the spray nozzle elevation guide opening 46a, and the ball screw nut 46 moves upward. Therefore, the spray nozzle support member 47 and the spray nozzle 49 also start to move upward (rise) together. The rotation of the ball screw nut 46 is restrained by the spray nozzle support member 47, in other words, the upward movement of the spray nozzle support member 47 is guided by the spray nozzle elevation guide opening 46a, thereby raising the spray nozzle 49. is continued in the movement region of ST1.

When the rotation of the ball screw shaft 44 by the servomotor 50 is continued and the spray nozzle support member 47 projecting to the side of the body frame 41 reaches the spray nozzle turning guide opening 46b, the rotation of the ball screw nut 45 is restricted. At the spray nozzle swivel guide opening 46b, the spray nozzle support member 47 is released only in the swivel direction, allowing the spray nozzle support member 47 to swivel about the ball screw shaft 44. FIG. Further, the upward movement of the ball screw nut 45 is also permitted within a range in which the spray nozzle support member 47 can be lifted according to the opening shape of the spray nozzle turning guide opening 46b. Therefore, the upper part of the spray nozzle support member 47 is guided by the spray nozzle turning guide opening 46b, and the spray nozzle support member 47 and the spray nozzle 49 continue to rise integrally (ST2), as shown in FIG. , the spray nozzle support member 47 is moved from the position indicated by the solid line (at the time of ST1 movement) to the position indicated by the two-dot chain line (the upper end position of the spray nozzle turning guide opening 46b shown in FIG. 3(c)). It turns about the ball screw shaft 44 by the movement angle ST2'.

On the other hand, when the spray nozzle support member 47 is at the position indicated by the two-dot chain line in FIG. The spray nozzle 49 and the spray nozzle support member 47 can be operated in the opposite manner as previously described. That is, in the movement area ST2, the spray nozzle 49 and the spray nozzle support member 47 are integrally lowered by the guidance of the spray nozzle turning guide opening 46b, and the ball screw shaft 44 is moved as the center in the movement area ST2'. The spray nozzle 49 and the spray nozzle support member 47 descend integrally in the movement area of ST1 by being guided by the spray nozzle elevation guide opening 46a.

As described above, in the vertical sleeve spray device 40 according to the first embodiment of the present invention, the spray nozzle 49 is moved toward and away from the injection sleeve 10 at the release agent application position at the spray nozzle turning guide opening 46b. The spray nozzle turning operation and the spray nozzle elevation operation for raising and lowering the spray nozzle 49 within the injection sleeve 10 at the spray nozzle elevation guide opening 46a can be performed only by the servomotor 50. In other words, the vertical sleeve spray device 40 according to the first embodiment of the present invention does not have a horizontally disposed drive mechanism for approaching and retracting movement of the portion including the spray nozzle 49. Approach/shelter movement is possible.

The confluence position of the lower end of the spray nozzle turning guide opening 46b and the upper end of the spray nozzle lift guide opening 46a is set relative to the "lower limit position" of the spray nozzle 49. 49 "spray ready position". Further, the upper end of the opening of the spray nozzle turning guide opening 46b is defined as the "retracted position" of the spray nozzle 49. As shown in FIG. In the first embodiment, the spray nozzle swivel guide opening 46b is curved. Other openings may be linear as long as they are smoothly continuous.

Here, when the spray nozzle support member 47 is guided in the spray nozzle guide opening 46 (the spray nozzle elevation guide opening 46a and the spray nozzle turning guide opening 46b), the spray nozzle support member 47 is positioned at the spray nozzle guide opening. The penetrating portion (main portion X in FIG. 2) penetrating through 46 is configured to be a separate part and replaceable with respect to spray nozzle support member 47 in consideration of contact with the opening cross section of spray nozzle guide opening 46, Preferably, the penetrating portion is made of a material having a lower hardness than that of the main body frame 41 or a lubricating material that provides less sliding resistance to the main body frame 41 . Also, a structure may be arranged to periodically apply a lubricant to the contact portion between the through portion and the spray nozzle guide opening portion 46 from the side of the spray nozzle support member 47 or the side of the body frame 41 .

In the vertical sleeve spray device 40 according to the first embodiment of the present invention, guidance of the spray nozzle support member 47 in the spray nozzle guide opening 46 (contact with the opening cross section of the spray nozzle guide opening 46) is smoother. In order to do so, a guide roller 48 is arranged in the penetration, the center of rotation of which coincides with the radial direction of the spray nozzle swivel movement. This is shown in FIG. 4(a).

The guide roller 48 is composed of a bearing portion 48a and a roller portion 48b integrally formed on the outer peripheral surface of the bearing portion 48a. This is called "both brim" or the like. The cross-sectional shape of the penetrating portion protruding from the ball screw nut 45 to the side of the body frame 41 is circular, and the center 47d of the penetrating portion coincides with the radial direction of the spray nozzle swiveling operation. The inner ring portion of the bearing portion 48a is inserted into the small diameter portion 47a continuously formed in the through portion, and the bearing nut 47c is screwed from the male threaded portion 47b on the other end side (spray nozzle 49 side). As a result, the guide roller 48 is fixed to the spray nozzle support member 47 . With such a configuration, the center of rotation of the guide roller 48 coincides with the radial direction of the spray nozzle rotating operation.

The guide roller 48 as described above makes the guide of the spray nozzle support member 47 in the spray nozzle guide opening 46 smoother. Specifically, in the spray nozzle guide opening 46, in both the spray nozzle swivel guide opening 46b and the spray nozzle elevation guide opening 46a, the gap between the opposing opening cross-sections of the spray nozzle guide opening 46 is The distance is larger than the projecting direction cross-sectional dimension of the penetrating portion of the spray nozzle support member 47 , that is, the outer diameter of the guide roller 48 . This is so that the guide roller 48 is guided in one of the opposed opening cross-sections of the spray nozzle guide opening 46 .

Here, FIG. 4(d), which is a view taken along line DD of FIG. 4(a), shows the guidance of the spray nozzle support member 47 in the spray nozzle turning guide opening 46b. FIG. 4(d) shows a state in which the guide roller 48 is positioned in the middle of the opposing opening cross-sections of the spray nozzle turning guide opening 46b. When the spray nozzle support member 47 descends, the guide roller 48 arranged in the through portion of the spray nozzle support member 47 is pressed against the lower cross section of the opposite opening cross section of the spray nozzle turning guide opening 46b. Therefore, as shown in FIG. 4(d), when the spray nozzle turning guide opening 46b is lowered to the right (raised to the left), the guide roller 48 rotates clockwise while the spray nozzle support member 47 turns (ST2). ') and the lowering motion (ST2).

On the other hand, in the state where the ball screw shaft 44 is rotationally driven and the ball screw nut 45 is raised, the guide roller 48 arranged in the penetration portion of the spray nozzle support member 47 is moved to the opposite opening of the spray nozzle turning guide opening 46b. It is pressed against the upper cross-section of the cross-section. Therefore, the guide roller 48 guides the turning motion (ST2') and the downward motion (ST2) of the spray nozzle support member 47 while rotating clockwise.

Although not shown, in the spray nozzle elevation guide opening 46a, when the ball screw shaft 44 is rotationally driven and the ball screw nut 45 is raised and lowered, the ball screw shaft 44 is rotated. The ball screw nut 45 also tries to rotate. As a result, the spray nozzle support member 47 rotates integrally with the ball screw nut 45 by the circumferential clearance of the spray nozzle elevation guide opening 46a and the guide roller 48, so that the spray nozzle elevation guide opening 46a faces the opposite opening. Either the left or right side of the cross section is pressed. Since the guide roller 48 guides the spray nozzle support member 47 while rotating with respect to the section on the pressed side, the spray nozzle 49 is stably raised and lowered (ST1).

Such a guide roller 48 may be manufactured according to the required specifications, but various sizes and specifications are available on the market, and it is easy to select and obtain based on the required specifications. For example, although not shown, the inner ring portion of the bearing portion 48a may protrude from only one side of the outer ring portion toward the center of rotation ("single flange") or may not protrude at all ("no flange"). be. Further, the material of the roller portion 48b, which is integrally formed on the outer peripheral surface of the bearing portion 48a, can be selected from metal, resin, and the like. Alternatively, as shown in FIG. 4B, there is also a form in which an H groove is machined on the outer peripheral surface side of the roller part 48b, and a form in which the bearing part 48a is composed of a double bearing in order to cope with a high load. .

On the other hand, the fixation of the guide roller 48 to the spray nozzle support member 47 is not by fixing with a bearing nut 47c as shown in FIGS. 4(a) and 4(b), but as shown in FIG. The spray nozzle support member 47 may be configured to be axially splittable at the through portion, and the split portion may be configured to have a threaded structure with a fitting structure or the like so as to sandwich the inner ring portion of the bearing portion 48a. , a suitable form may be adopted.

As described above, in the vertical sleeve spray device 40 according to the first embodiment of the present invention, the spray nozzle support member 47 is attached to the ball screw nut 45 of the ball screw mechanism that converts the rotary motion of the servomotor 50 into linear motion. The spray nozzle 49 is lifted/lowered by the structure in which the spray nozzle 49 is supported through the support. The upward and downward movement of the spray nozzle 49 is guided by the spray nozzle elevation guide opening 46a and the spray nozzle rotation guide opening 46b through the penetration portion of the spray nozzle support member 47, thereby allowing the portion including the spray nozzle to approach. - Arbitrary approach/shelter movements are possible without a horizontally arranged drive mechanism for the shunting movements.

With the above configuration, the upward/downward movement and the approach/retreat movement of the spray nozzle are continuously performed by a single servomotor. , contributes to shortening the casting cycle. In addition, since it is not necessary to provide a horizontally arranged drive mechanism for approaching and retracting the portion including the spray nozzle, the size and area required for installing the vertical sleeve spray device can be suppressed. It is possible to reduce the projected area required for installation of the vertical sleeve spray device.

The vertical sleeve spray device 40 according to the first embodiment of the present invention has been described on the assumption that it is applied to a vertical clamping/vertical casting type die casting machine. However, the vertical sleeve spray device 40 according to the first embodiment of the present invention can also be applied to a horizontal clamping/vertical casting type die casting machine. Although not shown, in a horizontal die-clamping die casting machine, a clamping force sensor is arranged on the tie bar nut on the stationary platen so as to protrude horizontally from the stationary platen. In addition, in a horizontal clamping/vertical casting type die casting machine, the vertical sleeve spray device is arranged on the non-operating side in consideration of maintenance and replacement of casting parts such as injection sleeves and plunger tips from the operating side. Therefore, if a conventional vertical sleeve spray device is placed on the non-operation side, the projection area required for installation is large. It was not possible to place it on the tie bar nut on the lower side of the non-operation side. By adopting the vertical sleeve spray device 40 according to the first embodiment of the present invention to a horizontal mold clamping/vertical casting type die casting machine, the projection area required for installation is small, and the mold clamping force sensor is located on the non-operation side. It can be placed on the lower tie bar nut.

Also, in the vertical sleeve spray device 40 according to the first embodiment of the present invention, as shown in FIG. rice field. However, as shown in FIG. 5, the side surface of the body frame 41 including the spray nozzle swivel guide opening 46b and the spray nozzle elevation guide opening 46a, which constitute the spray nozzle guide opening 46, is detachable from the body frame 41. It may be configured as a possible separate member. In order to facilitate understanding, the arrow corresponding to FIG. 3(b) is shown in FIG. 5(b), and the arrow corresponding to FIG. F arrow view). 5(a) is a cross-sectional view along line EE of FIG. 5(b), and FIG. 5(c) is a cross-sectional view along line GG of FIG. 5(d).

Specifically, as shown in FIGS. 5(b) and 5(d), the spray nozzle elevation guide opening member 146a having the spray nozzle elevation guide opening 46a opened is bolted to the side of the body frame 41. Fixed. Further, a spray nozzle turning guide opening member 146b having a spray nozzle turning guide opening 46b opened above the spray nozzle lifting guide opening member 146a is fixed to the side of the main body frame 41 with a bolt. Each opening then continues in the "spray ready position" previously described.

On the other hand, on the sides of the body frame 41 corresponding to the spray nozzle elevation guide opening 46a and the spray nozzle rotation guide opening 46b, as indicated by broken lines in FIGS. An opening with a larger opening area is processed.

In this embodiment, for example, when the casting weight of a vertical clamping/vertical casting die casting machine is small and the vertical stroke of the spray nozzle 49 in the injection sleeve 10 can be short, the spray nozzle lifting guide opening member 146a can be used. The opening length of the spray nozzle lifting guide opening 46a in the longitudinal direction of the main body frame 41 is shortened in accordance with the lifting stroke of the spray nozzle 49, thereby reducing the opening area. Intrusion of release agent splashes and contamination can be suppressed.

Further, regarding the retraction movement operation of the portion including the spray nozzle 49, the previously described "retreat position" of the spray nozzle 49 may be changed. Specifically, when different sizes of molten metal holding containers (ladles) are used according to the casting weight of a vertical clamping/vertical casting machine, the spray nozzle 49 can be retracted to shorten the casting cycle. If the "position" is changed for each size of the molten metal holding container (ladle), and the release agent splashes and contamination occur more than expected, the "retraction position" of the spray nozzle 49 should be changed to the hot water supply position from the beginning. This is the case, for example, when it is desired to retreat to a position separated from a certain injection sleeve 10 as much as possible.

In such a change of the "shelter position" of the spray nozzle 49, a plurality of spray nozzle swirl guide opening members 146b having different positions of the upper end of the spray nozzle swirl guide opening 46b are prepared, and the "shelter position" is appropriately changed. By exchanging the spray nozzle turning guide opening member 146b according to the "position", the "retraction position" of the spray nozzle 49 can be easily changed. Since high accuracy is not required for the positional accuracy of the "retreat position" of the spray nozzle 49 with respect to the control accuracy of the elevation operation for raising and lowering the spray nozzle 49 within the injection sleeve, replacement of the spray nozzle turning guide opening member 146b There is no problem even if the "shelter position" is changed by In order to wash the spray nozzle 49 at the "retracted position" of the spray nozzle 49 or at a position other than the "retracted position", the tip of the spray nozzle 49 may be immersed in a cleaning liquid container arranged nearby, or the cleaning effect may be improved. In some cases, the spray nozzle 49 may be moved slightly up and down within the same cleaning liquid container to increase the amount. The spray nozzle turning guide opening member 146b is also effective when adding a new position or lifting operation for cleaning the spray nozzle 49 like this.

On the other hand, in this embodiment, when the guide roller 48 shown in FIG. The position where the guide roller 48 is arranged so as to be guided by the opening cross section of the spray nozzle turning guide opening 46b of the nozzle turning guide opening member 146b, that is, the spray nozzle turning from the central axis of rotation of the ball screw shaft 44 All that is required is to determine the radial distance of the maneuver.

In FIG. 5, the side surface of the body frame 41 including the spray nozzle swivel guide opening 46b and the spray nozzle elevation guide opening 46a, which constitute the spray nozzle guide opening 46, is positioned relative to the body frame 41 for both openings. A configuration configured as a separate member that can be attached and detached at the same time has been shown. However, both openings do not necessarily need to be constructed as separate members that can be attached and detached. It may be in the form of

Further, in the vertical sleeve spray device 40 according to the first embodiment of the present invention, a form in which one guide roller 48 is arranged in the penetrating portion of the spray nozzle support member 47 has been described. However, as shown in FIG. 6, a configuration in which a plurality of guide rollers are arranged is also possible. To facilitate understanding, the arrow corresponding to FIG. 4(a) is shown in FIG. 6(a), and the arrow corresponding to FIG. HH arrow view). FIG. 6(c) is a view (sectional view) taken along line II in FIG. 6(b).

Specifically, a guide roller support member 147 is arranged near the through portion of the spray nozzle support member 47 . The guide roller support member 147 may be formed integrally with the spray nozzle support member 47, or may be attached to the spray nozzle support member 47 as a separate member. As shown in FIG. 6B, guide rollers 148 are arranged on the upper left side and the lower right side of the guide roller support member 147, respectively. As shown in FIG. 6(a), the guide roller 148 is of a type having a support shaft 148c, and the guide roller 148 is male threaded so that the support shaft 148c penetrates the guide roller support member 147 and protrudes. It is fixed to the guide roller support member 147 by screwing a nut 148d to one end.

At the other end of the support shaft 148c of the guide roller 148, a roller portion 148a is rotatably supported by a bearing portion (not shown). In FIG. 6(a), the guide roller 148 and others are shown as a simple side view for the sake of simplification. The center of rotation of the roller portion 148a of the support shaft 148c of 148 is arranged so as to coincide with the radial direction of the spray nozzle rotating operation. This is, of course, an arrangement for being guided along the opening cross section (vertical direction) of the tubular spray nozzle turning guide opening 46b. Further, in order to align the center of rotation of the roller portion 148a of the support shaft 148c of the guide roller 148 with the radial direction of the spray nozzle turning motion, the mounting portion of the guide roller 148 of the guide roller support member 147 is tapered. The nut 148d is tightened to the guide roller support member 147 via a tapered washer or the like. Although not shown, the portion of the guide roller supporting member 147 where the guide roller 148 is attached may be an oblique through hole with a counterbore.

Such a plurality of guide rollers 148 are also effective in guiding the penetrating portion of the spray nozzle support member 47 in the spray nozzle elevation guide opening 46a. In FIG. 6(b), the opening cross section of the spray nozzle elevation guide opening 46a opened in the vertical direction is indicated by the same reference numeral 46a and indicated by a chain double-dashed line. Unlike the form described with reference to FIG. 4, in which there is only one guide roller (48), the guide rollers 148 are arranged on the left and right sides of the opposed opening cross section of the spray nozzle elevation guide opening 46a. Even if the clearance between the spray nozzle elevation guide opening 46a and the guide roller 148 is small and the left and right guide rollers 148 rotate in contact with the cross section of the opening, the respective guide rollers 148 rotate in different directions. , the upward and downward movement of the spray nozzle 49 (spray nozzle support member 47). Conversely, although not shown, in FIG. 6B, a mechanism is provided in which the left and right guide rollers 148 are slightly pressed against the left and right opening sections, and the spray nozzle at the spray nozzle elevation guide opening 46a is provided. 49 (spray nozzle support member 47) may be raised and lowered more accurately. 6 shows a configuration in which two guide rollers 148 are arranged, the spray nozzle support member 47 is further provided at both the spray nozzle elevation guide opening 46a and the spray nozzle turning guide opening 46b. For smooth guidance, a form in which three or more guide rollers are arranged may be used.

On the other hand, in the vertical sleeve spray device 40 according to the first embodiment of the present invention, since the vertical motion of the spray nozzle 49 is controlled by the servomotor 50, the vertical motion is controlled by a direct-acting actuator such as a hydraulic cylinder or an air cylinder. Various controls of the up-and-down motion of the spray nozzle are possible for the vertical sleeve spray device. First, in the linear motion actuator, linear control of the lifting speed by controlling the rotation speed of the servomotor 50 is performed in response to the change (control) of the lifting speed by changing the flow rate of the hydraulic oil and the supplied air. The speed of movement of the spray nozzle can be varied during its operation, whether the nozzle is being raised or lowered.

Next, for the control (change) of not only the elevation speed of the spray nozzle but also the elevation range that is restricted by a mechanical stopper or the like in the case of a direct-acting actuator, the rotation speed of the servomotor 50 is maintained and rotationally driven. It is also possible to linearly control the elevation range by increasing or decreasing the time or increasing or decreasing the rotation speed while maintaining the rotation driving time. Not only is it possible to control the lifting speed and lifting range linearly, but also the values corrected based on the information obtained in the previous casting cycle are used in the control in the next casting cycle that is continuously performed. Feedback is also easy.

Conventionally, in a vertical sleeve spray device in which a direct-acting actuator such as a hydraulic cylinder or an air cylinder is used to move the spray nozzle up and down, for the purpose of controlling the temperature of the injection sleeve, etc., the amount of mold release agent applied inside the injection sleeve was controlled. When changing, it was difficult to finely control the upward and downward movement of the spray nozzle.

However, the mold release agent supply unit that supplies the mold release agent to the vertical sleeve spray device arranged in the vertical clamping/vertical casting die casting machine is preferentially arranged in the vicinity of the injection device due to the structure of the molten metal supply device. It is arranged on the side of the die casting machine, etc., away from the molten metal holding furnace. There is also a safety consideration to avoid arranging as much as possible equipment that handles liquid near the area that handles molten metal. As a result, the vertical sleeve spray device and the release agent supply unit are separated by a predetermined distance, and the release agent is supplied from the release agent supply unit to the vertical sleeve spray device through the fixed pipe or the tube pipe.

Therefore, even if the amount of the release agent supplied to the vertical sleeve spray device is controlled to increase or decrease on the release agent supply unit side, the increase or decrease control of the release agent is sprayed from the spray nozzle. A time lag occurs before it is reflected in the release agent amount. In addition, the amount (volume) of release agent supplied per unit time is far greater than that of fixed piping or tube piping. The release agent increase/decrease control amount is absorbed. Therefore, it was difficult to control the amount of release agent supplied to the vertical sleeve spray device with high accuracy. Furthermore, as disclosed in Patent Document 3, instead of controlling the supply amount of the release agent, if it is desired to increase the supply amount from a plurality of systems of spraying pressurized air circuits with different pressures. It is difficult to change (control) the amount of release agent to the intended amount in stepwise control of the amount of release agent, in which high-pressure pressurized air is selected when low-pressure pressurized air is desired to be reduced. In addition, since the pressure of the pressurized air for spraying is different, there is a problem that the state of spraying and application of the release agent to the inner wall of the injection sleeve differs depending on the selected pressure.

However, such problems can be solved by a release agent application control method using the vertical sleeve spray device according to the present invention. After maintaining a constant amount of release agent supplied from the release agent supply unit to the vertical sleeve spray device, the spray nozzle can be adjusted by controlling the lifting speed and the lifting range of the spray nozzle as described above. By controlling the up-and-down operation of , the amount of the release agent sprayed and applied to the inner wall of the injection sleeve is controlled. For example, the temperature of the injection sleeve is measured by a temperature measuring means such as a thermocouple or a temperature sensor arranged at a predetermined position of the injection sleeve, and the temperature of the same predetermined position is measured in each casting cycle of the injection sleeve after the release agent is applied. At least one of the release agent application time by the spray nozzle that moves up and down in the injection sleeve and the up/down speed of the spray nozzle may be controlled so that the temperature difference is within a predetermined range.

In addition, the temperature of the injection sleeve is measured by temperature measuring means arranged at a plurality of positions in the longitudinal direction of the injection sleeve, and the temperature difference at all of the plurality of positions for each casting cycle of the injection sleeve after the release agent is applied. Or, so that the difference in temperature for each of the plurality of positions is within a predetermined range,
At least one of the release agent application time by the spray nozzle that moves up and down in the injection sleeve, the range and speed of the up and down of the spray nozzle may be controlled.

Continuous casting in a state in which the amount of release agent supplied from the release agent supply unit to the vertical sleeve spray device and the pressurized air pressure for spraying are kept constant by the release agent application control method as described above. During the cycle, it is possible to control the temperature of the injection sleeve to keep it within the desired temperature range. Since the amount of release agent supplied to the vertical sleeve spray device and the pressurized air pressure for spraying are kept constant, if the release agent application time is lengthened, the spraying and application state will not change. It is possible to increase the amount of mold release agent that is sprayed/applied into the injection sleeve in proportion to time. Conversely, if the release agent application time is shortened, the amount of release agent that is sprayed and applied into the injection sleeve can be reduced.

In addition, due to the above state, even if the amount of release agent sprayed and applied into the injection sleeve within a predetermined release agent application time is the same, the increase or decrease in the vertical speed of the spray nozzle will cause the release agent to be released into the injection sleeve. The spraying/coating state of the mold agent can be changed by increasing or decreasing the amount of the mold release agent sprayed/coated per unit area. For example, if the lifting speed is increased, the amount of release agent sprayed/coated per unit area can be reduced, and if the lifting speed is decreased, the amount of the release agent can be increased. .

On the other hand, it is also possible to increase or decrease the amount of the release agent sprayed/applied into the injection sleeve at a specific position in the longitudinal direction of the injection sleeve by adding control over the upward/downward range of the spray nozzle. According to this control, for example, it is possible to cope with drum-shaped deformation of the injection sleeve, which occurs conspicuously in a vertical casting type injection apparatus.

A brief description of the drum-shaped deformation of the injection sleeve is provided. In a form in which the entire injection device is tilted about the tilt axis and the portion including the injection sleeve is retracted from the lower projection area of the lower die, the tilting is performed to prevent hot water from spilling from the injection sleeve during the hot water supply process. Molten metal is supplied to approximately the middle position of the injection sleeve above the injection device in the state. After supplying hot water, the injection device is returned from the tilted state to the vertical state as described above, and the upper end portion of the injection sleeve abuts (docks) the injection hole formed in the lower surface of the stationary mold. In the case of the vertical casting type injection device, the molten metal is held in the injection sleeve for a long time because the molten metal is injected and filled into the mold cavity at a low speed.

In this state, the molten metal is not supplied to the upper portion (upper end) of the injection sleeve in order to prevent the molten metal from spilling. In addition, when the plunger tip is raised and the molten metal flows in the upper part of the injection sleeve, the upper end of the injection sleeve is in contact (docked) with the fixed mold for most of the time. The accompanying radial thermal expansion of the upper portion of the injection sleeve is suppressed. On the other hand, the lower portion of the injection sleeve is connected to elevating means or the like for elevating the injection sleeve, and at this connection portion that is not directly affected by the heat of the molten metal, the radial direction of the lower portion of the injection sleeve accompanying the temperature rise due to the molten metal is always constant. thermal expansion is suppressed. As a result, the central portion of the injection sleeve, which has no external structure to restrain thermal expansion, expands more in the radial direction than the upper and lower portions where thermal expansion is restrained, resulting in a drum-like shape with a bulging center. It transforms.

In the release agent application control method as described above, for a predetermined time after the release agent application is started, the spray nozzle is moved up and down only at the central portion of the injection sleeve where the drum-shaped deformation has occurred, and the drum-shaped deformed portion is removed. Intensive cooling. After the predetermined time has passed, if the spray nozzle is moved up and down within its original range, it is possible to suppress the drum-shaped deformation of the injection sleeve and to spray and apply the release agent to a desired range within the injection sleeve. Even if the amount of molten metal supplied to the injection sleeve is changed, the vertical range of the spray nozzle may be changed according to the position where the drum-shaped deformation occurs.

As described above, the first embodiment and other related forms have been described as the modes for carrying out the invention, but the present invention is not limited to the above-described embodiments, and the contents described in the claims Needless to say, it can be implemented in various forms within a range that does not deviate from the above.

For example, in the first embodiment of the present invention, the vertical sleeve spray device 40 is employed in a vertical clamping/vertical casting die casting machine. Any die casting machine, such as a machine, in which the injection device with the injection sleeve and plunger tip is arranged vertically can be employed.

Further, in the vertical sleeve spray device 40 according to the first embodiment of the present invention, the body frame 41 has a tubular form. However, the body frame 41 does not necessarily have to be tubular over its entire longitudinal length, and at least the sides of the body frame 41 including the spray nozzle turning guide opening 46b are aligned with the center of the ball screw shaft 44. It may be configured with an arc cross-sectional shape. On the other hand, even if the cross-sectional shape of the body frame 41 including the spray nozzle turning guide opening 46b is rectangular (for example, square or rectangular), the penetrating portion of the spray nozzle support member 47 is guided to the spray nozzle guide opening 46. If it is a form, there can exist an effect of this application. When a guide roller is employed in the through portion, the guide roller is continuously guided to one of the upper and lower sides of the opening cross section of the spray nozzle swivel guide opening 46b during the spray nozzle swivel operation. , a configuration in which the length in the radial direction of the spray nozzle turning motion is increased may be adopted.

Further, in the vertical sleeve spray device 40 according to the first embodiment of the present invention, the servomotor 50 is arranged above the body frame 41 so that its output shaft is coaxial with the rotation center of the ball screw shaft 44. and the output shaft of the servomotor 50 and the upper end of the ball screw shaft 44 are connected via the coupling 52 as a rotation transmission mechanism. However, the servomotor 50 does not necessarily need to be arranged above the body frame 41 so that its output shaft is coaxial with the rotation center of the ball screw shaft 44 . Although not shown, the servo motor 50 is arranged on the side of the body frame so that its output shaft is directed upward and parallel to the ball screw shaft 44. Alternatively, the output shaft of the servomotor 50 and the upper end of the ball screw shaft 44 may be connected by a rotation transmission mechanism using a chain and gears. Further, the servomotor 50 may be arranged below or on the lower side surface of the body frame 41 as long as the ball screw shaft 44 can be rotationally driven by the rotation transmission mechanism.

On the other hand, by controlling the up-and-down motion and turning motion of the spray nozzle 39 with a servomotor, various controls are possible for a vertical sleeve spray device that performs these motions with a direct-acting actuator such as a hydraulic cylinder or an air cylinder. Become.

The servomotor can not only be rotationally driven with a desired rotational torque, but also can measure and monitor the actual rotational torque generated on the output shaft. For example, the up-and-down motion of the ball screw nut 45 is converted into the up-and-down motion and swiveling motion of the spray nozzle 49, and only the up-and-down motion of the spray nozzle 49 and the region of the spray nozzle swivel guide opening 46b (ST2, ST2') In the area of the spray nozzle elevation guide opening 46a (ST1) to be converted, the actual rotational torque generated in the output shaft of the servo motor 50 is greater in the area of the spray nozzle turning guide opening 46b (ST2, ST2'). big. By utilizing the function of monitoring the actual rotational torque of the servomotor, the output of the servomotor indicates whether the spray nozzle 49 is in ST1 or ST2 (ST2') in the vertical sleeve spray device during operation. By comparing the actual rotational torque generated in the shaft with the preset reference rotational torque of each region (ST1/ST2), the control device of the die casting machine can recognize it.

In addition, a small amount of guide resistance ( A guide obstructing member such as an elastic body is intentionally provided so as to provide unevenness of actual rotational torque). It is possible to make the control device of the die casting machine recognize the position of the area of .

Then, this actual rotational torque is recorded for each casting cycle in the upward/downward/rotating motion of the spray nozzle 49, and is compared with the torque fluctuation in the previous casting cycle or the preset reference torque fluctuation, which is regarded as good operation, to determine if there is an abnormality. The control device of the die casting machine may be made to recognize such torque fluctuations and the places where the fluctuations occur. With this kind of control, it is possible to grasp the signs of mechanical troubles in the ball screw mechanism and to grasp the degree of wear of the threads and balls of the ball screw mechanism, thereby avoiding mechanical troubles in the vertical sleeve spray device, This is effective in avoiding problems with the injection sleeve and plunger tip due to improper application of release agent to the inside.

On the other hand, the spray nozzle 49 (spray nozzle The following forms are possible for position retention of the support member 47).

First, the controller of the die casting machine recognizes that the spray nozzle support member 47 has reached the "retracted position" from detection by a position sensor or an increase in the actual rotational torque of the servomotor 50, or the like. After that, the application of the predetermined rotational torque to the ball screw shaft 44 is continued so that the spray nozzle support member 47 lifts the ball screw nut 45 at the above-described "retracted position". In this case, a mechanical structure for holding the spray nozzle support member 47 at the "retracted position" is not required. Naturally, the predetermined rotational torque to be applied to the ball screw shaft 44 is preferably the minimum rotational torque for holding the spray nozzle support member 47 at the "retracted position".

Next, there is a form that employs a mechanical configuration for holding the spray nozzle support member 47 at the "retracted position". The position may be held by a guide obstructing member such as an elastic body that gives a slight guide resistance (unevenness of actual rotational torque) to the penetrating portion (or guide roller) of the spray nozzle support member 47 as described earlier. Alternatively, the above-mentioned "retreat position" may be set not at the upper end (uppermost part) of the spray nozzle swivel guide opening 46b, but at a position slightly lowered therefrom, and the lower part of that position may be used as a substitute for the guide obstructing member. good. When the position is held by these guide obstructing members, that is, when the vertical sleeve spray device is not in operation, energy can be saved by stopping the supply of drive power to the servo motor 50 other than the control power supply. . Regarding the holding of the position of the spray nozzle support member 47 at the above-mentioned "retracted position", the above-described and other known suitable forms may be employed as appropriate.

1 injection device, 2 machine base, 10 injection sleeve, 40 vertical sleeve spray device, 41 body frame, 44 ball screw shaft, 45 ball screw nut, 46 spray nozzle guide opening, 46a spray nozzle elevation guide opening, 46b spray Nozzle rotation guide opening 47 Spray nozzle support member 48 Guide roller 49 Spray nozzle 50 Servo motor 52 Coupling (rotation transmission mechanism) 61 Mounting stand 146a Spray nozzle elevation guide opening member 146b Spray nozzle rotation guide opening member 147 guide roller supporting member 148 guide roller

Claims (3)

A vertical sleeve spray device in which a spray nozzle is moved toward and away from an injection sleeve at a release agent application position, and the spray nozzle is moved up and down within the injection sleeve to apply the release agent to the inside of the injection sleeve. hand,
a body frame erected parallel to the injection sleeve at the release agent application position;
a ball screw shaft that is rotatably supported above and below the main body frame and whose central axis of rotation is arranged parallel to the injection sleeve;
a ball screw nut combined with the ball screw shaft;
a spray nozzle guide opening opened to the side of the body frame;
a spray nozzle support member configured to project from the ball screw nut to the side of the body frame so as to penetrate the spray nozzle guide opening and to support the spray nozzle to the side of the body frame; ,
a servomotor arranged on the body frame;
a rotation transmission mechanism for transmitting rotation of the servomotor to the ball screw shaft;
with
The spray nozzle guide opening is
a spray nozzle turning guide opening for guiding the spray nozzle support member and turning the spray nozzle support member around the ball screw axis via the ball screw nut;
a spray nozzle elevation guide opening that guides the spray nozzle support member and raises and lowers the spray nozzle support member in parallel with the ball screw shaft via the ball screw nut,
The ball screw shaft is rotationally driven by the servomotor to move the ball screw nut up and down within the body frame, thereby moving the through portion of the spray nozzle support member, which penetrates the spray nozzle guide opening, into the spray nozzle. guided by the nozzle guide opening,
a spray nozzle swiveling operation of moving the spray nozzle toward and away from the injection sleeve at the release agent application position in the spray nozzle swivel guide opening;
a spray nozzle elevating operation for elevating the spray nozzle within the injection sleeve at the spray nozzle elevating guide opening;
A vertical sleeve spray device characterized by performing The side surface of the body frame, including at least the spray nozzle swirling guide opening, is configured with an arcuate cross-sectional shape whose center coincides with the center of the ball screw axis,
The vertical sleeve spray device according to claim 1. A release agent application control method using the vertical sleeve spray device according to claim 1 or claim 2 ,
The temperature of the injection sleeve is measured by a temperature measuring means arranged at a predetermined position of the injection sleeve, and the temperature difference at the predetermined position for each casting cycle of the injection sleeve after the release agent is applied is within a predetermined range. so that
controlling at least one of the release agent application time by the spray nozzle that moves up and down in the injection sleeve and the lifting speed of the spray nozzle;
A release agent application control method characterized by:

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