JP3167643B2 - Manufacturing method of molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a molded article made of a synthetic resin, and in particular, to greatly shorten a molding cycle by removing a cooled molded article from a mold. The present invention relates to a method for producing a molded article.

[0002]

2. Description of the Related Art For example, to manufacture a hollow molded article by a blow molding method,
It is manufactured through the following steps. First, the split mold in which the cavity is formed is moved to a position where the parison to be continuously extruded is provided, and the split mold is closed to hold the parison. Next, after cutting the parison, the split mold is retracted (retracted) so as not to contact the parison continuously extruded. And
After the blow pin is blown in from above the split mold, the split mold is opened after cooling and the molded product is taken out by the chuck of the molded product take-out device.

[0003] In the above manufacturing process, in order to take out the cooled molded article from the split mold, for example, after opening the split mold after cooling, the parison is used by the parison to mold the next molded article. When moving to the extruded position and closing the split mold, the molded product hanging on the blow pin is
After temporarily holding the platen of the mold clamping device or the molded product holder provided in the split molding die, pull out the blow pin,
The molded product held by the molded product holder is taken out by the chuck of the molded product removal device.

[0004] However, in the above method, unless the operation of pulling out the blow pin from the molded product held in the molded product holder is completed, the split molding die cannot be retracted (moved) and the subsequent molded product removal device. Molding cannot be taken out by the chuck. In other words, in the above method, when the split mold is retracted, it is necessary to wait until the blow pin is pulled out of the molded product, so that a wasteful waiting time occurs and the molding cycle cannot be shortened.

Therefore, conventionally, for example,
A method as shown in FIG. 7 has been proposed. That is, as shown in FIG.
01, 102, blow pin 104 of blowing device 103
Prepare to drive from below.

Next, as shown in FIG. 1B, a blow pin 104 is driven from below the split molds 101 and 102, and air is blown into the parison existing in the split molds 101 and 102. Next, after cooling the formed product, the split molds 101 and 102 are opened and the blow pin 104 is moved downward. Then, as shown in FIG. 3C, after the blowing device 103 is rotated by 90 degrees about the rotation shaft 105, the blow pin 10 is positioned horizontally.
4, for example, the molded product 106 such as a bottle is pulled out.

However, in the above-described removal method, since the air cylinder 107 is used to move the blow pin 104 up and down and the air cylinder (not shown) is used to rotate the blow pin 104 by 90 degrees, a molded product is used. It takes time to remove 106.

For this reason, as shown in FIG. 8, a method has been proposed in which the operation of moving the blow pin 104 up and down and the operation of rotating the blow pin 104 are operated by one servomotor 108.

[0009] Such a method, as shown in FIG.
Blow pin 10 is applied to split molds 101 and 102 which have been clamped.
4 is blown, and air is blown into the parison existing in the split molds 101 and 102. Next, after cooling the formed product, the split molds 101 and 102 are opened, and the blow pin 104 is moved downward. Then, as shown in FIG. 3B, after the blow pin 104 is tilted by 30 degrees, the opening of the molded product 106 hanging from the blow pin 104 is clamped by the chuck 109 of the product take-out device. Take out.

In the above-described method, the use of the servomotor 108, which operates at a higher speed than that of an air cylinder, makes it possible to perform the up / down operation and the rotation operation of the blow pin 104 at a high speed, thereby shortening the molding cycle. .

However, when the molded product 106 is taken out, the blow pin 104 is rotated by 30 degrees. Therefore, it takes a long time to take out the molded product 106 for the rotation operation.

Accordingly, it is an object of the present invention to provide a method of manufacturing a molded article which significantly shortens the time required for removing the molded article from the mold after cooling, thereby shortening the molding cycle and improving the productivity. Is to provide.

[0013]

Means for Solving the Problems The invention described in claim 1, by extruding a parison from the extruder continuously subjected feeding the split mold halves, and cut the parison, implanted blow pin into the split mold halves A method for producing a molded product formed in the split mold by blowing air from the blow pin into the parison, and after cooling, opening the split mold to take out the blow pin. Driving from below, before or after driving the blow pin, retract the split mold from the position where the parison is supplied , and retract the split mold.
Then, blow air into the parison from the blow pin,
After the blow pins have been driven in and before the split mold is opened, the burrs protruding from above the split mold connected to the molded product being formed in the split mold by the chuck of the molded product take-out device. After holding and holding the molded product, the split mold is opened and the blow pin is pulled out of the molded product, and then the molded product is conveyed to the next step by the chuck while the burr is gripped. In addition, the above object has been attained by providing a method for manufacturing a molded product, characterized in that the split mold is moved to a position where the parison is supplied.

According to a second aspect of the present invention, air is blown.
Before the exhaust process is completed, the burr is
The grip according to claim 1, wherein
By providing a method for manufacturing molded articles,
It has been achieved. According to a third aspect of the present invention, there is provided the method of manufacturing a molded article according to the first or second aspect , wherein a cooling water is supplied to the chuck to provide a method of manufacturing the molded article. The purpose has been achieved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

FIG. 1 is a process chart showing the steps until a molded product is removed from a mold, FIG. 2 is a perspective view showing a state in which burrs protruding from the mold are gripped by a chuck of a product removal device, and FIG. FIG. 4 is a perspective view showing a state in which a mold is opened and a molded product is taken out, FIG. 4 is a front view showing the product take-out device partially cut away, and FIG. 5 is a process diagram showing a comparison between the present invention and conventional processes. is there. FIG. 5 merely shows the steps in order, and does not show the time of each step.

First, a method of manufacturing a molded article according to the present embodiment will be briefly described with reference to FIGS. First, as shown in FIG. 1A, the parison 2 is continuously supplied from the crosshead 1 of the extruder. Next, the pair of split molds 3 and 4 are moved to a position where the parison 2 is supplied by a mold moving motor. At this time, the split molds 3 and 4 are opened so that the parison 2 is gripped. The movement of the split molds 3 and 4 is simply referred to as mold movement in FIG.

Next, as shown in FIG. 1 (b), the parison 2 suspended to a predetermined length is sandwiched between a pair of split molds 3, 4. Next, after the parison 2 is cut by a cutter, the blowing device 5 is raised, and the blow pins 8 are driven from below the split molds 3 and 4.

Then, as shown in FIG. 1C, the split molds 3 and 4 are moved by the mold moving mechanism, and the split molds 3 and 4 are retracted from the position where the parison 2 is supplied. The blowing into the parison 2 is performed while moving the split molds 3 and 4.

Next, when the split molds 3 and 4 reach the positions retracted from the parison 2, the chucks 6 and 6 of the product take-out device advance and are being formed in the split molds 3 and 4. of the split mold 3 and 4 which are Tsu connected to the molded part of the
The burrs 7 protruding from above are gripped by the chucks 6 and 6. During this time, air is blown into the parison 2 to perform an exhaust process.

Next, when the exhaust process is completed, FIG.
As shown in (2), the split molds 3 and 4 are opened, and at the same time or after the molds are opened, the blowing device 5 is moved downward as indicated by the arrow Y to remove the blow pin 8 from the molded product 9. As a result, the molded article 9 after cooling is held by the chucks 6 and 6. Then, the chucks 6 and 6 are moved in the direction indicated by the arrow X in the figure, and the split molds 3 and 4 are moved again to the position where the parison 2 is supplied. Through the above steps, the molded article 9 made of a synthetic resin is molded, and one molding cycle is completed.

Next, an apparatus used in the manufacturing method of this embodiment will be briefly described. First, the configuration of the blowing device 5 will be described. The blowing device 5 includes a base plate 10
, A toggle mechanism for bending and extending these links 11, 11 and a blow pin 8 which can be moved up and down by the toggle mechanism.

The toggle mechanism transmits the rotation of the servo motor 12 to the pulley 13 and moves the block 15 which moves back and forth along a feed screw 14 supported by the pulley 13,
By abutting against an abutting member 16 rotatably provided at the connecting portion of the pair of links 11, 11, the link 11,
11 is bent in the vertical direction.

The blow pin 8 is fixed on a blow pin base 17 fixed to the tip of one link 11. The blow pin base 17 includes a pair of guide rods 1.
8, 18 and each guide rod 18, 18
To the guide portion 1 provided on the base plate 10.
By being guided to 9, 19, it can be moved up and down.

Next, the configuration of the take-out device will be described. As shown in FIG. 4, the take-out device moves a pair of chucks 6, 6; a chuck opening / closing mechanism 20 for opening and closing these chucks 6, 6; And a moving mechanism 21.

As shown in FIG. 4, the pair of chucks 6 and 6 comprise a pair of arms, and a pair of tie bars 2 disposed on a platen 22 for fixing the split molds 3 and 4.
The gaps between the tie bars 23 and the split molds 3 and 4 are arranged so as to enter the gaps between the tie bars 23 and the split molds 3 and 4. In order to cool the burrs 7, the chucks 6 and 6 are provided with a cooling water introduction pipe (not shown) for circulating cooling water therein.

The chuck opening / closing mechanism 20 is provided at the rear end of the chucks 6, 6, as shown in FIG. The chuck opening / closing mechanism 20 controls the pair of chucks 6 and 6 so as to open and close in a direction in which they come into contact with each other and in a direction in which they leave.

The moving mechanism 21 includes a belt driving motor 25 composed of a servomotor and a belt driving motor 2.
The belt 26 includes an endless belt 26 that is rotated by the belt 5 and a pair of pulleys 27 and 28 on which the belt 26 is wound.

The pair of pulleys 27 and 28 and the belt 26 hung on the pulleys 27 and 28 are accommodated in a cover case 29. The belt 26 rotates forward and backward by a belt drive motor 25 provided outside the cover case 29.

The chuck opening / closing mechanism 20 is fixed to the belt 26. For this reason, the chucks 6 and 6 can be freely moved in the arrow X direction in FIG. 4 by the belt 26 rotated by the belt drive motor 25.

The molded product 9 taken out of the split molding dies 3 and 4 is transferred by the chucks 6 and 6 to the next step, for example, as shown in FIG. After the processing, the mouth processing unit 31 performs the processing of the mouth.

Next, with reference to FIGS. 2 to 4, the steps up to taking out the molded product 9 from the split molds 3 and 4 by the chucks 6 and 6 together with the blowing device 5 and the taking-out device having the above configuration will be described. It will be described in detail. As shown in FIG.
While air is being blown into the parison 2 by the blowing device 5, burrs 7 protruding from above the divided molds 3 , 4 which are connected to the molded product in the divided molds 3 , 4 are removed. It is gripped by the chucks 6,6. In other words, instead of opening the split molds 3 and 4 and then inserting the chucks 6 and 6 to chuck the cooled molded product 9 as in the past, blow molding is performed in the present embodiment. During the process, the burrs 7 protruding from above the divided molds 3 and 4 connected to the molded article 9 being molded are gripped, thereby shortening the removal time of the molded article 9.

Since the chucks 6 and 6 are provided with cooling water introduction pipes, the burrs 7 protruding from the split molds 3 and 4 are cooled. For this reason, the molded article 9 can be reliably transported to the subsequent process without the burrs 7 adhering to the chucks 6 and 6.

Next, as shown in FIG. 3, after the exhaust process is completed, the split molds 3 and 4 are opened, and simultaneously or after opening, the blowing device 5 is moved downward as indicated by arrow Y. The blow pin 8 is pulled out of the molded product 9. Then, the chucks 6 and 6 are moved in the direction indicated by the arrow X in the figure (the next step), and the split molds 3 and 4 are moved to a position where the parison 2 is supplied.

Molded product 9 taken out from split molds 3 and 4
Is sent to the next process while being held by the chucks 6 and 6,
After the burr processing is performed by the burr processing unit 30, the mouth processing unit 3
At step 1, the mouth is processed.

As described above, in the method for manufacturing a molded product according to the present embodiment, the divided molding dies 3 and 4 which are connected to the molded product 9 being molded in the divided molding dies 3 and 4 protrude from above . After the burrs 7 are held by the chucks 6 and 6 of the product take-out device, the divided molds 3 and 4 are opened after cooling, and the chucks 6 and 6 are moved to cool the burrs 7 from the divided molds 3 and 4. Since the molded article 9 is taken out, the operation of taking out the molded article 9 is performed in parallel with the molding operation, and the molding machine immediately starts the next operation without stopping the molding machine. The waiting time for handling the molded article can be reduced, and the molded article 9 can be manufactured efficiently.

As described above, according to the method for manufacturing a molded article of the present embodiment, the time required for removing the molded article 9 after cooling from the split molds 3 and 4 can be greatly reduced, and the molding cycle can be shortened. Shortening can be achieved, and significant improvement in productivity can be realized. Further, since the cooling water is supplied to the chucks 6, 6, the burrs 7 protruding from the split molds 3, 4 can be cooled.

[0038] In machine operation time occupying the molding cycle in the production process of the present embodiment, it is possible to shorten the machine operating time of the extraction process zero seconds at the shortest (0 seconds) leave it operating time to. Therefore, according to the present invention, it is possible to contribute to eliminating the time required for this step in a remarkable molding machine which has recently been remarkably speeded up.

As described above, the method of manufacturing a molded article to which the present invention is applied is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. An example
For example, the configuration of the blowing device 5 can be variously changed.
You.

FIG. 6 is a view from above of the split molds 3 and 4.
The blow molding is performed by inserting the blow pin 8 and performing the split molding.
The burrs 7 coming out of the molds 3 and 4 are chucked by the chucks 6 and 6.
It is a reference drawing showing the example of making it grasp.

[0041]

[0042]

As is apparent from the above description, according to the present invention, the time required for removing the cooled molded product from the mold is greatly reduced, thereby shortening the molding cycle and improving the productivity. It is possible to provide a method for manufacturing a molded article which realizes improvement of the molded article.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a process chart sequentially showing steps until a molded product is removed from a mold.

FIG. 2 is a perspective view showing a state in which burrs protruding from a mold are held by a chuck of a product take-out device.

FIG. 3 is a perspective view showing a state in which a mold is opened and a molded product is taken out.

FIG. 4 is a partially cutaway front view of the product take-out device.

FIG. 5 is a process chart showing a comparison between each step of the present invention and a conventional step.

FIG. 6 is a perspective view showing an example in which a blow pin is inserted from above the split mold to perform blowing, and burrs coming out from above the split mold are gripped by a chuck.

FIG. 7 is a process diagram sequentially showing a conventional manufacturing method in which a blow pin is vertically moved and rotated using an air cylinder.

FIG. 8 is a process diagram sequentially showing a conventional manufacturing method in which a blow pin is moved up and down and rotated using a servomotor.

[Explanation of symbols]

 2 Parison 3, 4 Split mold 5 Blowing device 6 Chuck 7 Burr 8 Blow pin 9 Molded product 21 Moving mechanism

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 49/00-49/80

Claims (3)

(57) [Claims] 1. Extruding a parison continuously from an extruder
Subjected Feed split mold Te, cut the parison, implanted blow pin into the split mold, the molded article molded in the divided mold by blowing air into the parison from the blow pin, cooled In the method for manufacturing a molded product which is opened and taken out of the split mold, the blow pin is driven from below the split mold,
Before or after the blow pin is driven, the split mold is retracted from the position where the parison is supplied , and
While the split mold is retracted,
Air is blown into the parison, and after the blow pins are driven in and before the split mold is opened, the chuck of the molded product take-out device is used to connect the molded product being molded in the split mold to the split mold. After holding the burr protruding from above, after forming the molded product, open the split mold and pull out the blow pin from the molded product. Then, the molded product is gripped by the chuck, and the burr is gripped. A method of manufacturing a molded product, wherein the divided molding die is moved to a position where the parison is supplied, while being conveyed to the next step. 2. The method according to claim 1, wherein the burrs are gripped by the chuck before the exhaust process after the blowing of the air is completed. 3. The method according to claim 1, wherein cooling water is flowed through the chuck.