JP2002066405A - Apparatus and method for coating molding surface of metal mold with water-based mold release agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus which can uniformly coat the surface of a metal mold with a mold release agent without causing over spray. SOLUTION: In the apparatus for coating the outer surface of a tubular mold with the water-based mold release agent, the distances between the surface of a metal mold A and spray guns 8a, 8b are always kept constant even when the mold size is varied. The surface speed of the tubular outer surface is always kept constant even when the mold size is varied. By selecting the spray concentration of the mold release agent on a double coat section, the amount of the release agent applied per unit area of the mold surface is always kept uniform even when the mold size is varied. Thus, over spray is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to forming an endless rubber belt with a cylindrical mold, and applying a water-based release agent for coating the surface of the mold to smoothly remove the belt sleeve from the mold. Water-based mold release agent coating device and coating method for forming mold surface

[0002]

2. Description of the Related Art When removing a belt sleeve from a mold, unlike the removal of a general resin product, it is necessary to remove the belt sleeve by sliding the belt sleeve in the shear direction on the mold surface.
For this reason, a release agent using condensation-curable silicone has been used, and it was used after being dissolved in dichloromethane.Recently, however, halogens have been used due to global environmental problems such as destruction of the ozone layer and adverse effects on the human body. Use is being restricted, and dichloromethane is similarly restricted. From this, the present applicant has already proposed an aqueous release agent and a method of spraying the aqueous release agent, but the aqueous release of an emulsion in which a toluene solution of a condensation-curable silicone polymer and a curing agent is dispersed in water with a surfactant. Agent is used.

In a conventional coating apparatus, for example, as shown in FIG. 5, a spray gun is mounted on a rotating drum outside the mold and rotated while adjusting the maximum diameter of the mold, while the metal is suspended upward. While the mold descends into the rotary drum and rises again, the spray gun described above uniformly sprayed the mold surface, which is the cylindrical surface of the cylindrical mold.

[0004]

However, the water-based release agent has a problem in natural drying, and if it is sprayed too much, the part tends to be insufficiently dried. As a result, spots having a polka dot pattern are formed on the mold surface, resulting in poor belt appearance quality. For this reason, it is necessary that the release agent be uniformly applied to the mold surface without overspray. In the conventional coating apparatus described above, the belt circumference size is different, that is, the diameter of the mold is different, and in the small diameter type, the spray gun moves away and the amount of adhesion is reduced, and in accordance with this, the large diameter type tends to be overspray and the coating variation is large. There was a problem.

[0005] In addition, from the viewpoint of improving the drying property, it has been originally desired from the viewpoint of improving the drying property to uniformly apply the minimum amount to the insufficient drying, which is a weak point of the aqueous release agent, in order to improve the productivity.

Accordingly, the present invention has been made to solve such a problem. Even if the size of the mold fluctuates, the minimum amount of the aqueous release agent is uniformly applied to the molding surface of each mold to reduce the variation. Accordingly, it is an object of the present invention to provide a method of applying an aqueous release agent to a molding surface of a mold, which prevents occurrence of overspray, thereby shortening unnecessary drying time and reliably removing the mold.

[0007]

According to the first aspect of the present invention, there is provided an apparatus for applying a water-based release agent to a mold forming surface for forming an endless belt. Means to make the speed constant, means to make the distance between the mold forming surface and the spray port constant, and spray means to reduce the atomization concentration by half at the overlapping part of the spray start part and the end part, and to apply repeatedly. A water-based mold release agent coating device for the mold molding surface that keeps the spray amount per unit area of the mold molding surface constant. The moving speed of the coating surface is not changed, and the distance from the spray gun is not changed. In addition, in the atomization state of the spray gun, select the density of the release agent, and apply twice in the twice-applied area at half the density, and apply once in the standard-applied area once to start spraying. The overlap between the part and the end part can be made substantially uniform with the standard coating amount. In other words, it is possible to apply one turn, apply a thin coating twice at the beginning and end, and apply a standard spray to the other parts to apply evenly.

In the invention according to the second aspect of the present invention, the means for keeping the distance between the mold forming surface and the spray port constant is to provide a touch bar protruding from the spray port by a length corresponding to a fixed interval, and to provide the touch bar with a predetermined distance. This is a device that uses two cylinders to perform the operation of determining the contact interval and the positioning of the spray port. The size of the mold carried into the front of the spray gun varies, and the spray distance to the molding surface changes. By touching the touch bar, one small thrust cylinder detects the stroke change at the time of contact and separates the tip of the touch bar. The other cylinder performs an interval setting movement operation, and can position the spray port at a constant interval in response to a change in the position of the molding surface (described later).

In the invention according to the third aspect of the present invention, the spraying means for over-coating is a water-based release agent coating apparatus for applying a release agent to a molding surface for adjusting the shading by the supply amount of the release agent, and sends the pressure to a spray gun. The flow rate of the release agent liquid is easily adjusted by the back pressure of the pressurized tank, the atomizing air is fixed, and as a result, the spray concentration can be adjusted.

In the invention according to claim 4 of the present application, the means for keeping the relative speed constant detects a stroke position of a cylinder for extending the touch bar to the molding surface of the mold and detects a stroke corresponding to each predetermined position. This is a water-based mold release agent application device to a molding surface of a mold, which is controlled to change the speed by the rotation speed of the mold. Since the size of the mold brought into the front of the spray gun is different, that is, the outer diameter changes, the molding surface speed changes at a constant rotation. Therefore, the change in the outer diameter is preliminarily related to the stroke position of the cylinder, and the rotation speed of the large-sized mold is low at the stroke position where the extension is small, and the rotation speed is low at the stroke position where the extension is large. Rotate at high speed. As a result, the surface speed moving in front of the spray port is almost always constant irrespective of the size of the mold.

[0011] The invention according to claim 5 of the present application is a water-based mold release agent application device for applying a common hanging tool to the center of the upper surface of the mold, lifting the mold, and rotating the mold. It is possible to precisely position the die loaded without the rotating means in front of the spray port and rotate the molding surface to give a surface speed. In addition, the space between the transfer table and the bottom surface of the mold can be secured between the transfer table and the mold bottom because the mold is lifted.

According to a sixth aspect of the present invention, in the method for applying an aqueous release agent to a mold forming surface for forming an endless belt, the relative speed between the mold forming surface and the spray port, After adjusting the distance between the spray ports to a constant value, apply a water-based release agent to the mold forming surface. A method of applying a water-based release agent to a molding surface of a mold, characterized in that a spray amount per unit area of the surface is made constant. By spraying the spray gun while rotating the coating surface at a constant surface speed at intervals, the variation in the coating amount can be reduced even if the mold size changes. Furthermore, for the part where the coating is applied at the beginning and end of coating, the atomization concentration of the release agent is selected and the coating amount is made uniform. Spraying is prevented, thereby shortening the drying time and improving productivity.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a side view of an aqueous release agent coating apparatus of the present invention, FIG. 2 is a detailed view of a means for keeping a relative speed constant, FIG. 3 is a detailed view of a spraying means, and FIG. FIG. 3 is a detailed view of the distance determination. In the apparatus for applying a water-based release agent to a mold molding surface of the present invention, first, in FIG.
, And are carried in and out from the side to be applied. This apparatus comprises a booth main body 5, a means 2 for setting a relative speed at which a mold lifting section 10 for lifting a loaded mold A is installed above the main body, and a spray gun section 7 on the side. A means 3 (shown in FIG. 3) for adjusting the atomization density of the spray gun unit 7 is installed (not shown) beside the booth main body 5. .

The booth body 5 is enclosed by an iron plate panel made of a mold steel as an aggregate, and the filter D is removed to the side of the booth body 5 at a position opposed to the spray gun unit 7 and the means 3 for keeping the interval constant, and exhausted. There is an exhaust part 6. Mold A on the other side
Is provided with an entrance for carrying in and out of the transport pallet C, and is opened and closed by a shutter door (not shown).

The means 2 for keeping the relative speed constant is shown in FIGS.
As shown in the figure, a mold chucking portion 9 is provided at the lower end, and a mold lifting portion 10 that lifts the chucked mold A is installed on the ceiling aggregate 6 of the booth main body 5 and rotates the lifted mold A to rotate. Part 23. The mold A fixed on the mold transfer pallet C is carried into the booth main body 5 and stopped at the fixed position at the center by the centering pin.

As shown in FIG. 2, the mold chuck section 9 shrinks the three slide claws 38, enters the opening B at the center of the upper surface of the mold A, rotates the cam disk 35 by the cylinder 31, and rotates the cam disk 35. Slide claw 3 inserted in guide groove
The fixing pin 36 of No. 8 is guided outward, the three slide claws 38 are expanded, and the mold A is chucked. Next, the vertically moving cylinder 22 of the mold lifting section 10 is extended to connect the connecting bar 20.
The base plate 25 connected to the guide rod 19 is slidably supported by the guide bushing 18 and lifts the mold A. Thereafter, a rotating shaft 27 is supported by a rotating bearing 26 by a gear 29 which is rotationally driven by a motor 24 via a speed reducer 28 provided on a base plate 25, and a rotating plate 30 at the lower end of the rotating shaft 27 is rotationally driven to rotate the metal. Type A
To rotate.

For controlling the rotation speed of the mold A to keep the relative speed constant during rotation, the interval setting cylinder 1 shown in FIG.
5, the extension position of the interval setting cylinder 15 is detected by using a plurality of switches 61 (switches sensitive to the piston of the cylinder), and based on the diameter of the mold A corresponding to this position in advance. Means 3 for calculating and programming the number of revolutions at which the peripheral speed is constant, and making the following interval constant
The number of rotations is selected each time simultaneously with the operation of. In this position detection control, the rotation speed is changed in steps,
The stepless speed change may be handled by replacing the extension stroke of the interval setting cylinder 15 with a linear sensor.

FIG. 4 shows the details of the means 3 for keeping the interval constant. It mainly comprises a touch bar 11 having a narrower front end, a connector 13 at a rear end, a linear bearing 59, and two large and small cylinders 14, 15. The small cylinder 14 comes into contact with the mold and has a small thrust, so it is easy to contract. The touch bar 11 is slidably supported on the booth main body 5 by a guide bushing 12 so as to be slidable, and the rear end is connected to the moving head 60 of the interval setting cylinder 15 via the linear bearing 59 by the connector 13. . The small cylinder 14 is mounted on the moving head 60 and can extend and contract the touch bar 11 by 20 to 30 mm via the connection tool 13.

The interval setting operation with the mold A is performed by pressing the moving head 60 of the interval setting cylinder 15 in a state where the small cylinder 14 is extended and the touch bar 11 is projected, and the front end of the touch bar 11 is lifted. The small cylinder 14 is forcibly contracted by approaching and contacting the outer surface of the mold A, and the moving head 60 of the interval setting cylinder 15 is stopped and fixed by operating the built-in limit switch.
Thereafter, the small cylinder 14 shrinks and the touch bar 11
Is separated from the mold surface. As a result, the spray port B is set to the protrusion length L of the touch bar 11 and the small cylinder 1
It is always set to a constant value at an interval obtained by adding 30 mm of the stroke of No. 4.

When the mold A is lifted and a space is formed between the mold A and the pallet C, as shown in FIG. 1, wheels are attached to a cono-shaped frame 48 mounted outside the booth main body 5. The receiving tray 47 is drawn by the cylinder 46 on the rail 49, covers and covers the mold transport pallet C, closes the bottom opening in the booth, and receives the spray mist from above, thereby improving the exhaust efficiency.

As shown in FIG. 3, the spraying means 4 includes release agent tanks 42a and 42b which hold the release agent liquid through compressed air pressure reducing valves 41a and 41b, and an opening / closing valve for turning on / off the liquid supply. 43a, 43b, spray guns 8a, 8b,
Batching and mixing of mixed air for spray gun atomization 2
It comprises a one-way valve 44 and an on-off valve 45 for opening and closing the nozzles of the spray gun all at once. Here spray gun 8
For a and 8b, a gun having a flat flat pattern is selected. In this embodiment, as shown in FIG. 4, two spray guns are vertically arranged to obtain a one-character pattern. The spray angle is the amount of mixed air, and the atomization concentration is the release agent tanks 42a, 42
The holding pressure of b is given a high / low pressure difference by the compressed air pressure reducing valves 41a and 41b, respectively, and the density can be set by adjusting the amount of liquid sent to the spray guns 8a and 8b. This is performed by turning the valves 43a and 43b on and off.

Next, as for the mounting of the spray guns 8a and 8b, as shown in FIG. 4, a connection block 56 is fixed to a base flange 54 inserted into the touch bar 11, and a rod 55 is fastened to the connection block 56 to fix the spray guns 8a and 8b. It is finely adjusted and fastened to the body mounting seat of 8b.

The operation of the apparatus for applying a water-based release agent to the molding surface of the present invention will be described below. As previously mentioned,
1) The entrance of the booth main body 5 slides up, and the mold A placed on the mold transport pallet C stops at a fixed position in the booth main body 5. 2) The mold chuck 9 descends to mold A
Chuck and lift. 3) The shutter is lowered, the entrance is closed, and the tray 47 is inserted on the pallet. 4) The touch bar 11 is extended until the mold A is detected, and when the touch bar 11 contacts, the small cylinder 14 detects the contact and the interval setting cylinder 15 is stopped. 5) The small cylinder 14 is retracted, the touch bar 11 is separated from the mold A surface, and the spray guns 8a and 8b are positioned at regular intervals. 6) The exhaust unit 6 in the booth is activated to start spraying. First, spraying is started at a low concentration, and at the same time as the rotation of the mold A is started, the concentration is switched to a high concentration to slowly detect a predetermined molding speed based on a predetermined mold diameter based on the position condition in which the mold molding surface is detected. Rotate. Just before the start of spraying when the mold has approached one round, the spraying is switched to a low-density spray, and the spray coating sections are sprayed, the spray guns 8a and 8b are turned on and off by the shutoff valve 45, and the application is completed. 7) The mold A stops rotating, and the tray 47 avoids the outside of the booth main body 5. 8) The mold A is placed on the lower transport pallet, and the booth exit rises.
9) The mold A is carried out, the outlet is closed, and the exhaust is stopped.
A series of operations ends.

The details of the apparatus for applying the aqueous release agent to the molding surface of the mold have been described above. Hereinafter, the details of the application method will be described. According to the above-mentioned apparatus function, flat spray patterns close to a flat plate are arranged in the vertical direction to form a uniform spray band having a vertical line, and the distance from the mold surface is always constant at 100 to 400 mm regardless of the mold diameter size. At the same time, the mold surface speed is set to 100 to 800 milliseconds, and one round of application is performed at a constant spray concentration of 0.5 to 5 milligrams / square centimeter to prevent variation in the coating amount due to the mold size. The application method of eliminating overspray can be performed by reducing the spray concentration by half at the spray start and end zones, which become the overspray application. By reducing this variation, the absolute spray amount can be reduced, and the drying time can be shortened.

The embodiment is not limited to the above, but may be modified as follows. (1) In the present embodiment, the application is performed in one rotation, but a method of reducing the spray concentration and increasing the number of times of application may be used. (2)
The movement of the spray gun is controlled at predetermined intervals by detecting the mold diameter with the outer shape touch bar every time, but may be performed based on a program numerical value from the previous process.

[0026]

As described above, according to the coating apparatus of claim 1 of the present application and the coating method of claim 6 of the present invention, a toluene solution of a condensation-curable silicone polymer and a curing agent is converted into water with a surfactant. Using the aqueous release agent of the dispersed emulsion,
Prevent overspray by applying evenly,
Since demolding can be performed as in the case of the conventional solvent-type release agent, the use of halogen can be reduced due to problems such as global environmental problems and adverse effects on the human body by replacing with dichloromethane.

According to the coating apparatus of the second to fifth aspects, it is possible to uniformly apply to the molds having different circumferential lengths while preventing the variation in the amount of the release agent applied per cylindrical surface area of each mold. From this fact, it is possible to improve the working environment by preventing overspray, shorten the drying time, and improve the productivity.

[Brief description of the drawings]

FIG. 1 is a side view of a water-based release agent coating device of the present invention.

FIG. 2 is a detailed diagram of a means for making a relative speed constant.

FIG. 3 is a detailed view of a spraying unit.

FIG. 4 is a detailed view of determining a distance between a molding surface and a spray port.

FIG. 5 shows a conventional release agent application device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 water-based release agent coating device 2 means for keeping relative speed constant 3 means for keeping interval constant 4 spray means 5 booth body 6 exhaust unit 9 mold chuck unit 11 mold touch bar A mold B spray port C-type pallet L Projection length

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) B29C 33/58 B29C 33/58 (72) Inventor Shinji Aono 4-1-1-21 Hamazoedori, Nagata-ku, Kobe City, Hyogo Prefecture No. Mitsuboshi Belting Co., Ltd. (72) Inventor Akihiro Yoshida 4-1-1, Hamazoe-dori, Nagata-ku, Kobe City, Hyogo Prefecture F-term within Mitsuboshi Belting Co., Ltd. 4D075 AA01 AA65 AA67 AA71 AA82 AA85 CA07 DA08 DA20 DA29 EA06 4F035 AA03 BA22 CB02 CB05 CC01 CD03 CD19 4F202 AA45 AG16 AH12 CA11 CB01 CM64 CM83

Claims (6)

[Claims] 1. An apparatus for applying a water-based release agent to a molding surface of a mold for molding an endless belt, comprising: means for keeping the relative speed between the molding surface and the spray port constant; A constant spraying amount per unit area of the mold molding surface, comprising: A water-based release agent coating device for a mold molding surface. 2. The means for making the interval constant includes two steps: providing a touch bar protruding from the spray port by a length corresponding to the predetermined interval, and contacting the mold forming surface to determine the interval and positioning the spray port by two. 2. The apparatus for applying a water-based release agent to a molding surface of a mold according to claim 1, wherein the apparatus is applied by a cylinder. 3. The water-based mold release agent coating apparatus according to claim 1, wherein the spraying means for applying the paint repeatedly adjusts the shading with the supply amount of the mold release agent. 4. A means for keeping the relative speed constant detects a stroke position of a cylinder for bringing the touch bar into extension contact with the molding surface of the mold, and changes the speed at a predetermined number of revolutions of the mold corresponding to each position. 3. An apparatus for applying a water-based release agent to a molding surface of a mold according to claim 1, wherein the apparatus is controlled. 5. The apparatus for applying a water-based release agent to a molding surface of a mold according to claim 4, wherein the common hanging tool is inserted into the center of the upper surface of the mold, pulled up and rotated. 6. A method of applying an aqueous release agent to a mold forming surface for forming an endless belt, wherein a relative speed between the mold forming surface and the spray port and a distance between the mold forming surface and the spray port are constant. After the adjustment, apply the aqueous release agent to the mold forming surface, and in the overlapping part of the spray start part and the end part, reduce the atomization concentration by half and apply again, and spray amount per unit area of the mold forming surface A method of applying a water-based release agent to a molding surface of a mold, wherein