JPH11254456A - Method for cleaning mold for molding in apparatus for manufacturing molded article and its apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cleaning a mold for molding in an apparatus for manufacturing a molded article and its apparatus wherein cycle time and the time for opening a mold are shortened and upsizing of the whole apparatus is prevented from occurring. SOLUTION: After molding by using a top mold 9, a middle mold 10 and a bottom mold 11 of a molding unit 1 is finished, the middle mold 10 is moved back and forth on a guide rail 17 and is transferred on a guide rail 19 of a removing unit 3 and burrs and a runner molded part 14a are removed by means of a cutter 23 and a molded article 2 is pushed out by means of a pushing-out pin 21 at a lower part of a pin hoisting/lowering device 20 and is stored in a chute 28. When the middle mold 10 is returned, a rotating brush 22 covered with a cover body 24 with a cutter 23 brushes away cut wastes stuck on the middle mold 10 into a chute 27. In addition, when the middle mold 10 is transferred to the guide rail 17, the cut wastes being still stuck are completely swept by air jetting from an air blow nozzle 26. The middle mold 10 returned to the molding unit 1 can be entered to the next molding process as it is.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article of rubber or the like using a mold (die) comprising a middle mold and a lower mold for forming a cavity and an upper mold for forming a material introduction path to the cavity. Regarding production, in particular, when the mold is opened in the molding unit, the molded product is held in the middle mold, the middle mold is moved to the adjacent take-out unit, and unnecessary moldings such as gates are cut there, and molded from the middle mold with extrusion pins. The present invention relates to a method of cleaning a molding die in a molding product manufacturing apparatus of a type in which a molded product is extruded, then returns to a molding unit and production of a molded product is started again, and an apparatus therefor.

[0002]

2. Description of the Related Art In manufacturing a molded article such as rubber by using a molding die, in the case of a molded article having a complicated shape, for example, a piston cup of a hydraulic device, an intermediate product is previously prepared by using an upper mold, a middle mold and a lower mold. Then, a part of the intermediate product is cut off to obtain a final product. That is, as shown in FIG.
A cavity 12 of a molded product is formed by the middle mold 10 and the lower mold 11, and a sprue 13 and a runner 14 for supplying a molding material to the cavity 12 are formed in the upper mold 9. The sprue 13 is connected to a nozzle 16 of an injection device (not shown).
The upper mold 9 is supported and fixedly installed on a base member (not shown), and the middle mold 10 and the lower mold 11 are supported by a lifting device (not shown) and can be independently moved in the vertical direction.
In particular, the middle die 10 is configured to be able to reciprocate in a horizontal direction at a predetermined portion (see Japanese Patent Application Laid-Open No. H10-24425).

Therefore, when the mold is opened as shown in FIG. 7, the molded product 2 is securely held on the middle mold 10 by the integral runner molding portion 14a and the annular projection 8 via the connecting portion 15a. Is moved in the horizontal direction as indicated by the arrow A, and the intermediate product is obtained by cutting off the runner molding portion 14a integrated with the sprue molding portion 13a with the cutter 23 which is in the fixed position and almost contacts the upper surface of the middle die 10, As shown in FIG. 8, the molded article 2 is cut at the portions indicated by chain lines a and b,
Cylindrical base part 5 from which a part of annular lip part 6 is cut off
(Product W) and a cap portion 7 having an annular projection 8 and a connection portion 15a. Therefore, in order to allow the horizontal movement of the middle die 10, a forming unit in which the middle die 10 and the lower die 11 are respectively arranged to be able to move up and down, and a take-out unit for receiving the horizontal movement of the middle die 10 are formed to form a molded product manufacturing apparatus. Make up.

[0004]

However, according to the above-described conventional molded article manufacturing apparatus, the middle mold 10 holds the molded article 2 and moves in parallel from the molding unit to the take-out unit to move the runner molding section 14a and the runner molding section 14a. Sprue forming part 13a
Unnecessary moldings such as are cut off, and the cutting die and fine burrs at the time of the cutting are placed or adhered, so that the middle mold 10 must be cleaned every time one process is completed. When this is performed at the stage when the middle mold 10 returns to the molding unit, the time required for cleaning increases the cycle time,
This leads to a decrease in productivity.

In addition, since the molding process cannot be performed while the mold surface is being cleaned, the mold opening time is prolonged, the variation in the mold temperature is increased, and the quality of the molded product is reduced. Further, under the present circumstances, the cleaning process of the mold surface has to be provided with a dedicated drive mechanism or the like independently, so that the entire apparatus has been increased in size.

Accordingly, the present invention has been made in view of the above circumstances, and provides a method and a device for cleaning a molding die of a molded article manufacturing apparatus capable of preventing an increase in the size of the entire apparatus without extending a cycle time or a mold opening time. It is something to offer.

[0007]

According to the present invention, as a means for solving the above-mentioned problems, according to the first aspect, a part of a molding die holding a molded product in a molding unit is transferred to an adjacent take-out unit. In a molded product manufacturing method in which the molded product from which an unnecessary molded portion has been cut forward and extruded is moved back to the molding unit and the molding process is started again, the movement of the molding die in the removal unit is performed. In the middle of the path, there is provided a mold cleaning device comprising a rotary brush and / or an air blow nozzle for removing burrs and cutting debris on the mold surface, and the mold cleaning device is used when the mold returns. The present invention also provides a method of cleaning a molding die in a molded article manufacturing apparatus, wherein the method removes the burrs, unnecessary molding portions, or cutting chips generated at the time of cutting the burrs and unnecessary molding portions.

According to a second aspect of the present invention, there is provided a molding unit having a molding die including a middle die and a lower die for forming a cavity, and an upper die for forming a material introduction path to the cavity. When separating the upper mold, the solidified material in the material introduction path of the upper mold is left integrated with the molded article of the middle mold, and the molded article is engaged with the middle mold at the material remaining portion, and the movement of the middle mold is continued. In this case, in a molded product manufacturing apparatus having a removal unit that cuts out the material remaining portion with a cutter just before the molded product removal position and then pushes the molded product from above with a push pin from above, the removal unit A rotating brush that is rotatable in contact with the surface of the middle die in front of the molded product take-out position, and a cover body that covers the rotating brush and the cutter and allows the movement of the middle die, During ~ Its mold surface during movement to provide a mold cleaning apparatus in molded article manufacturing device characterized in that it has to be cleaned.

According to a third aspect of the present invention, the mold cleaning device includes an air blow nozzle provided at least at an outlet of the take-out unit on the molding unit side. The rotary brush has a drive source and can be forcibly rotated. In addition, according to claim 5, the cutter has a drive source and a blade portion is parallel or orthogonal to a mold surface. A mold cleaning device in a molded article manufacturing apparatus, characterized in that the apparatus can be switched to a direction in which the mold is cleaned.

[0010] Therefore, a mold cleaning device is attached to the take-out unit so that cleaning is performed in the middle of the moving path of the mold, so that it is not necessary to extend the cycle time and the mold opening time is long. In addition to solving the inconvenience, it was possible to prevent the molded product manufacturing apparatus from being enlarged. According to the second aspect of the present invention, the rotating brush and the cutter are covered with the cover body, so that the swarf is prevented from being scattered. In the third aspect, the air blow nozzle completely removes the swarf which still adheres to the middle mold. In addition to
An air curtain is formed between the take-out unit and the forming unit. Further, in the configuration of claim 4, the cleaning efficiency of the rotating brush is improved. Dropping action occurs.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
A description will be given based on FIG.

In FIG. 1, reference numeral 1 denotes the piston
A molding unit for molding a rubber molded product 2 such as a cup, and 3 is a take-out unit arranged adjacent to the molding unit 1. The units 1 and 3 perform a series of operations in cooperation with each other, and the mold cleaning according to the present invention is performed during the series of operations.

The molding unit 1 has three molding dies: an upper mold 9, a middle mold 10, and a lower mold 11. The upper mold 9 is fixed to a base member supported by a platen 1a, and the middle mold 10 is a guide rod 1b. And a guide rail 17 which can be moved up and down by a driving means (not shown) so as to reciprocate in a horizontal direction, and has a cylinder device 18 as the horizontal driving means. Along the driving means 11a
Is fixed to a guide plate 11b which can be moved up and down. Therefore, the middle mold 10 and the lower mold 11 can be independently raised and lowered. Also, the cylinder device 18
Is moved up and down integrally with the middle mold 10. When these molds reach the lowest position when the mold is opened, the cylinder device 18 is operated to move the middle mold 10 forward along the guide rail 17. A cavity 12 similar to the above-described conventional one is formed in the middle mold 10 and the lower mold 11 and the upper mold 9 is formed.
Are formed with a sprue 13 and a runner 14 as a material introduction path to the cavity 12. Therefore,
FIG. 1 shows a connecting portion 15a, a runner forming portion 14a, and a sprue forming portion 13a after forming, and, for convenience of illustration, the cavity 12 and the molded product 2 are simply illustrated in a square shape.

On the other hand, the take-out unit 3 is composed of a frame having a guide rail 19 fixed at a position that is at the same level as the guide rail 17 of the molding unit 1 that has descended most, and above the end of the guide rail 19. The pin elevating device 20 is installed at the bottom. The pin elevating device 20 includes a plurality of extrusion pins 21 corresponding to the respective cavities 12 of the middle mold 10. When the middle mold 10 moves along the guide rail 19 to the terminal end thereof, the extrusion pins 21 are simultaneously lowered. It is made to let. As shown in FIG. 1 to FIG. 3, a rotating brush 22 and a cutter 23 are disposed at an appropriate distance before the pin elevating device 20, that is, in the middle of the movement path of the middle die 10.
The cover body 24 is fixedly installed above the guide rail 19, and an air blow nozzle 26 for ejecting air toward the middle mold 10 is provided at the outlet of the take-out unit 3 at the start end side of the guide rail 19 and formed. A mold cleaning device is configured.

The rotating brush 22 is configured such that a roll brush having an axial length covering substantially the entire area in the width direction of the middle die 10 comes into contact with the middle die 10 and is forcibly rotated by a brush motor 29 to clean the upper surface of the middle die 10. The cutter 23 has a blade edge directed horizontally to the molding unit 1 side, and furthermore,
It is installed so as to be almost in contact with the upper surface of the middle die 10 that moves forward along. For this reason, when the middle die 10 is conveyed along the guide rail 19, the cutting edge of the cutter 23 enters the lower surface of the runner forming portion 14a during the movement operation of the middle die 10, and the runner forming portion 14a is Can be sequentially cut from the connecting portion 15a.
In addition, the cutter 23 can be rotated by a cutter motor 30 in the horizontal and vertical directions within a range of approximately 90 degrees. When the middle die 10 moves forward, it is parallel to the middle die 10 and the middle die 10 is returned. It can be vertical when moving.
The cover body 24 is a tunnel-shaped surrounding body having an axial length greater than the axial length of the rotary brush 22, and linear brushes 25 are respectively fixed to the front and rear lower end portions so as to hang down. The linear brush 25 surrounds the cutting tool and the like scattered in the cover body 24 in contact with the upper surface of the middle die 10 so as to be accommodated in the shooter 27 and can pass through the sprue forming section 13a and the runner forming section 14a.

In general, it is effective to forcibly rotate the rotating brush 22. However, even if the rotating brush 22 is not forcibly rotated, it is effective.
If the cleaning effect is produced by the strong rotation following the strong contact with the middle mold 10 when returning, the forced rotation is not essential. The cutter 23 has a cutter motor 30 so that the cutting edge is horizontal when the middle die 10 moves forward and the cutting edge is vertical when the middle die 10 moves backward. If the means to be properly wiped off, for example, an air blow nozzle is installed in the vicinity, they may be fixed in parallel with the middle mold 10 as in the past. Further, the forced rotation of the rotating brush 22 is performed by providing a rack on the middle die 10 and using a pinion engaging with the rack to rotate the rotating brush 22.
Is rotated, the brush motor 29 can be omitted.

In the above configuration, when manufacturing the molded product 2, first, the middle mold 10 and the lower mold 1 of the molding unit 1 are formed.
1 is raised toward the upper mold 9, and the three molds of the upper mold 9, the middle mold 10 and the lower mold 11 are closed as shown in FIG. Sprue 1
3 and the runner 14 are filled into the cavity 12.
Then, the solidification of the rubber material is waited, and when the rubber material has solidified, the middle mold 10 and the lower mold 11 are lowered to open the mold. At this time, the molded product 2 formed by solidifying the material in the cavity 12 is firmly engaged with the middle mold 10 by the upper runner 14a and the lower annular projection 8 as shown in FIG. , Medium size 1 without remaining on lower mold 11 side
It is securely retained on the 0 side.

Next, when the lower mold 11 and the middle mold 10 are respectively lowered to the lowest position, the cylinder device 18 is actuated and the middle mold 10 is engaged with the guide rail 19 of the take-out unit 3 from the guide rail 17 and the pin elevating device. It moves to the 21 side.
At this time, when the middle die 10 passes under the cutter 23,
The runner molding portion 14a is sequentially cut from the connection portion 15a of each molded product 2 by the cutting edge of the cutter 23. In this way, the runner molding portion 14a and the sprue molding portion 13a integral therewith are completely removed from each molded product 2, and are accommodated in the shooter 27. Thereafter, when the middle die 10 stops below the installation position of the extrusion pin 21, the extrusion pin 21 is lowered by the operation of the pin elevating device 20, and each molded product 2 held by the middle die 10 is moved downward by the extrusion pin 21. It is pushed out and stored in the shooter 28. When the removal of the molded article 2 is completed in this way, the middle mold 10 is
8 returns to the initial position in the molding unit 1 by the retreating operation of the rotating brush 22.
Is scraped off and attached to the upper surface of the middle die 10 and stored in the shooter 27, and the debris attached to the surface of the middle die 10 coming out of the linear brush 25 is removed from the air blow nozzle 26. An air curtain is formed between the molding unit 1 and the air curtain by blowing off the air. The middle mold 10 thus cleaned returns to the molding unit 1 and directly enters the next molding step, and the cycle time starts.

[0019]

As described above, according to the present invention, since the mold surface is cleaned by the mold cleaning device while the middle mold is moving, there is no need to provide a separate cleaning step, and therefore, the molding cycle is not required. It does not change the time at all,
Rather, the efficiency can be shortened.

Further, since the removal of the molded product and the cleaning of the molding die are not performed in separate processes, the opening time of the molding die is not changed at all. It does not cause any inconvenience that causes a reduction.

Furthermore, since the mold cleaning device of the present invention is provided in the middle of the moving path of the mold, it does not require a separate step, and therefore does not increase the size of the molded article manufacturing apparatus, but rather does not involve equipment. Can be made compact.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of the embodiment.

FIG. 3 is a plan view showing a main part of the embodiment.

FIG. 4 is a side view showing the outline of the cleaning device in the embodiment.

FIG. 5 is a side view showing the operation of the cleaning device in the embodiment.

FIG. 6 is a partial sectional view of a conventional molded product manufacturing apparatus.

FIG. 7 is a partial sectional view of one process in a conventional molded article manufacturing apparatus.

FIG. 8 is a longitudinal sectional view of a product obtained from an intermediate product.

[Explanation of symbols]

 2 Molded product 9 Upper mold 10 Middle mold 11 Lower mold 12 Cavity 14 Runner 17, 19 Guide rail 18 Cylinder device 22 Rotary brush 23 Cutter 24 Cover body 25 Linear brush 26 Air blow nozzle 27, 28 ... Shooter 29 ... Brush motor 30 ... Cutter motor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Onuki 330 Kinagakawa Rubber Industry Co., Ltd., Naganuma-cho, Inage-ku, Chiba-shi

Claims (5)

[Claims] 1. A part of a molding die holding a molded product in a molding unit moves forward to an adjacent take-out unit and pushes out a molded product from which an unnecessary molded part has been cut, and then the molding die is moved to the molding unit. In the method for manufacturing a molded product, in which the molding process is restarted and the molding process is started again, a rotary brush and / or an air blow nozzle for removing burrs and cutting chips on the surface of the molding die in the middle of the moving path of the molding die in the unloading unit. A molding tool cleaning device comprising either one of them is provided, and the molding die cleaning device performs cleaning of the burrs, unnecessary molding portions, or cutting chips generated at the time of cutting off the molding burrs when the molding die returns. A method of cleaning a molding die in a molding product manufacturing apparatus. 2. A middle mold and a lower mold forming a cavity,
A molding unit having a molding die consisting of an upper mold forming a material introduction path to the cavity, and forming the solidified material in the material introduction path of the upper mold into a middle mold when separating the upper mold and the middle mold. The molded product is engaged with the middle die at the material remaining portion while being left integrated with the product, and at the time of the subsequent movement of the middle die, the material remaining portion is cut off by a cutter before the molded product removal position, and thereafter, A molded product manufacturing apparatus comprising: a take-out unit for extruding a molded product from a middle mold with an extrusion pin from above; a rotating brush rotatable in contact with a surface of the middle mold in front of a molded product take-out position in the take-out unit. Forming a cover body covering the rotary brush and the cutter and allowing the movement of the middle mold, wherein the mold surface is cleaned during movement of the middle mold. Product manufacturing Mold cleaning apparatus in location. 3. A middle mold and a lower mold forming a cavity,
A molding unit having a molding die consisting of an upper mold forming a material introduction path to the cavity, and forming the solidified material in the material introduction path of the upper mold into a middle mold when separating the upper mold and the middle mold. The molded product is engaged with the middle die at the material remaining portion while being left integrated with the product, and at the time of the subsequent movement of the middle die, the material remaining portion is cut off by a cutter before the molded product removal position, and thereafter, A molded product manufacturing apparatus comprising: a take-out unit for extruding a molded product from a middle die with an extrusion pin from above, wherein a rotary brush rotatable in contact with a surface of the middle die, the rotary brush and the cutter are provided in the take-out unit. And an air blow nozzle is provided at least at the outlet of the take-out unit on the molding unit side, so that the medium die can be moved. Mold cleaning apparatus in molded article manufacturing apparatus that mold surface during is characterized that it has to be cleaned. 4. The apparatus according to claim 2, wherein said rotary brush has a drive source and is capable of forcibly rotating. 5. The molded article manufacturing apparatus according to claim 2, wherein the cutter has a driving source and a blade portion can be switched in a direction parallel or orthogonal to a mold surface. Mold cleaning device.