JPS62222828A - Method for preparing tank made of synthetic resin by blow molding - Google Patents

Abstract

PURPOSE:To achieve the simplification of manufacturing equipment even if tank main bodies have many kinds of shapes, by a method wherein tank main bodies having several kinds of predetermined shapes are molded to be cooled while fed to one manufacturing line and the predetermined shapes are discriminated and classified by a discrimination device to be subjected to machine processing and welding processing. CONSTITUTION:A wt. inspection device 27 and a thickness inspection device 28 are provided in the downstream side of blow molding machine main bodies 2, 3 and a cooling cell 31 is formed in the downstream side of both devices 27, 28 to be connected to a cooling buffer 32 for once storing tank main bodies 22 as it is. A discrimination apparatus 24 formed of sensors each discriminating the predetermined shape of each tank main body 22 after the completion of cooling is provided in the downstream side of the cooling buffer 32 and a plurality of processing cells 33 are provided in the downstream side of said discrimination apparatus 24 so as to feed the tank main body classified on the basis of each predetermined shape to each of the processing cells 33... suitable for each predetermined shape.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a synthetic resin tank by blow molding, and particularly to a method for manufacturing tank bodies having several predetermined shapes on one production line. The present invention relates to a method for manufacturing a synthetic resin tank.

[Prior Art] It is already known that synthetic resin tanks are generally molded using a blow molding machine as shown in Japanese Patent Publication No. 58-12142 and Japanese Patent Publication No. 58-23212. Attempts have been made to use this molding machine to blow mold automobile fuel tanks.

This is because fuel tanks for automobiles have traditionally been press-formed metal tanks, which limits the shapes that can be formed, and increasing the trunk capacity of an automobile reduces the space within the vehicle body that can accommodate the fuel tank. For this reason, synthetic resin tanks that can be molded into complex shapes are attracting attention as automotive fuel tanks due to demands for effective use of space within the vehicle body and weight reduction of tanks. This is due to p.

This method of manufacturing a synthetic resin tank by blow molding involves injecting a molten cylindrical parison by suspending it from the parison head of a molding machine, and then splitting the tank body in the axial direction so that the parison is sandwiched around the outer circumference of the parison. The molding mold is assembled and clamped, and gas is blown into the inside of the parison from the lower part of the mold to adhere the parison to the inner wall of the mold, thereby forming a tank body having a hollow chamber inside. After cooling is complete, the mold with which the silk was attached is disassembled and the formed tank body is removed. After that, various inspections such as weight inspection,
Holes were made by mechanical machining such as T, fusion machining such as chamber fusion, machining, and assembly of parts such as pumps.

[Problems to be Solved by the Invention] By the way, the conventional method of manufacturing a synthetic resin tank by blow molding has the following problems.

As mentioned above, synthetic resin tanks are attracting attention as fuel tanks for automobiles because of their ability to be molded into complex shapes, but their shapes vary depending on the vehicle model due to differences in the space inside the vehicle, etc. Therefore, tank bodies having several types of predetermined shapes are required. Therefore, in the method for manufacturing a synthetic resin tank as described above, the parts to be machined and fusion-bonded differ depending on the respective predetermined shapes. As a result, it became difficult to manufacture tank bodies with several types of predetermined shapes on one production line, and the number of WA manufacturing lines increased.
There is a problem with the increase in the number of times.

Because of the opening, the advantage of synthetic resin tanks, which can be molded into complex shapes, cannot be taken advantage of, leading to a problem of reduced utilization.

In view of the above problems, the object of the present invention is to provide a method for manufacturing synthetic resin tanks by blow molding, which allows synthetic resin tanks to be manufactured in several predetermined shapes on one production line. That is.

[Means for Solving the Problems] In order to solve the problems in the method of manufacturing synthetic resin tanks by blow molding, the present invention involves molding tank bodies having several types of predetermined shapes by blow molding, and The main body is cooled while being transported to one production line, and after cooling is completed, the above-mentioned predetermined shape is classified into 11 by a discriminator, and machining and fusion processing suitable for each predetermined shape are performed. be.

[Operation] As described above, tank bodies having several predetermined shapes are discriminated and sorted into predetermined shapes by the discriminating device, so that machining and fusing suitable for each predetermined shape can be carried out in one production line. Since processing can be carried out, manufacturing equipment can be simplified even if the tank body has many different shapes, and the advantage of synthetic resin tanks, which can be molded into complex shapes, can be utilized.

[Example] A preferred example of the method of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, two well-known blow molding machine bodies 2.3 are installed side by side in a production line 1 for carrying out the method of the present invention. Each of these blow molding machine bodies 2.3 consists of a mold, a parison molding machine, and the like. Each of the blow molding machine bodies 2.3 is provided with a drive unit 4.5 for driving them and a mold cooling device 8.9 for cooling the molds 6, 7. Also, adjacent to the molds 6 and 7 provided in the blow molding machine bodies 2 and 3 are insert parts supply devices 10 and 11 for supplying inner parts such as mounting fittings into the molds 6 and 7, respectively. has been done. These molds 6.7 are each formed into a different predetermined shape. Then, these blow molding machine main bodies 2
, 3 are provided with tank body transfer robots 12 and 13 for transferring the tank bodies formed by these to the next process of the manufacturing line 1. These tank body transfer robots 12, 13 are each equipped with deburr removal cells 14, 15 for removing deburrs generated along the butt joints of the molds 6, 7 on the tank body.

These deburring cells 14 and 15 are removed by this,
A crushing device 16 for crushing the collected paris is connected, and a raw material cell 17 for accommodating the crushed paris crushed by the crushing device 16 and recycled as raw material as powder is connected to the crushing device 16. The tank body transfer robots 12 and 13, the crushing device 16, and the raw material cell 17 are connected by a conveyor line 18 such as a belt conveyor.

By the way, as shown in FIG. 2, the molds 6 and 7 are connected to a tank body molding mold 19, a hanger part molding mold 2, O, etc. disposed on the upper part of the tank body molding mold 19. It consists of The hanger member 21 molded by the hanger member molding die 20 is integrally formed with the tank body 22 on the edge portion 23 formed at the upper part of the tank body 22, as shown in FIG. 3 so as not to be supported at one point. As shown, it is formed to have a predetermined value of 1J. Also, on this hanger member 21, there is a mark 25 that serves as an identification mark for a discriminating device 24 to be described later, and serves as a work reference point for machining and fusion processing.
J marked with: Made of sea urchin. The tank body 22, which is formed into different predetermined shapes by the molds 6 and 7 of the blow molding machine bodies 2 and 3, has a hanger member 21, for example, a hanger clip 2G of a hanger conveyor, etc., as shown in FIG. By grasping this information, it is conveyed to the next process of the III manufacturing line 1. On the downstream side of the blow molding machine bodies 2 and 3 of the production line 1, a heavy lifting inspection device @27 is provided. This heavy enclosure inspection device 2
A layer thickness inspection device 28 is provided on the downstream side of 7. These weight inspection device 27 and layer thickness inspection device 28 are connected to
9.30 are branched from the production line 1 and connected to each other. The downstream side of the layer thickness inspection device 28 is a cooling cell 31, which is directly connected to a cooling buffer 32 for temporarily storing the tank body 22. cooling buffer 3
A discriminating device 24 formed of a sensor or the like for discriminating a predetermined shape of the tank body 22 that has been completely cooled is installed downstream of the tank body 22.

This discriminating device 24 reads the mark 25 and discriminates and sorts the tank bodies 22 into respective predetermined shapes. This discrimination mechanism employs, for example, color discrimination, magnetic discrimination, optical discrimination, shape discrimination, etc.

On the downstream side of this discrimination device 24, a plurality of processing cells 33...
・The tank body 22 which is sorted into each predetermined shape is provided with a machining hill 33 suitable for each predetermined shape.
It is designed to be transported to... These processing cells 33 are configured to perform machining and fusion processing suitable for each predetermined shape on the tank body 22 using the mark 25 as a reference point. In this example, each
Two processing cells 33 suitable for each predetermined shape are provided for each predetermined shape. These additions] -
An assembly cell 34 is provided downstream of the rails 33 . On the downstream side of this assembly cell 34, two airtightness inspection devices 35.
36 are arranged in parallel. And these airtightness inspection devices 3
5.36 is provided with a product unloading section 37, which is the final part of the production line 1, and the hanger conveyor that makes up the production line 1 is connected to the tank body transfer robot 12.13. As a whole, a circular production line 1 is formed.

Next, the method of the present invention implemented using the production line 1 as described above will be specifically explained.

First, the above-mentioned raw material is ff1ffi of the powder raw material in the mold 17, heated in a parison molding machine, and injected by hanging the parison from the parison head. 5, the tank body 22 is formed by a well-known blow molding method. In the production line 1 used in this embodiment, two blow molding machine bodies 2.3 are installed, and each of these is equipped with molds 6 and 7 having different predetermined shapes. Therefore, tank bodies 22 each having a different predetermined shape are formed. Further, as shown in FIG. 2, the hanger member 21 is formed integrally with the tank body 22 in the rib portion 23 formed on the upper part of the tank body 22 by the single hanger member molding die. . Furthermore, when blow molding the tank body 22, a mold 19 as shown in FIG.
0.11 is supplied into the mold 19 and formed integrally with the tank body 22. This mounting bracket 38 is attached to the tank body 22.
As shown in the figure, the blow molding method of integrally forming the
Three embedded enlarged parts 39 are formed at the base end of a mounting fitting 38 such as a bolt, and the embedded enlarged parts 39 are exposed and positioned in advance on the inside of one mold for forming the tank body, and the tip of the mounting fitting 38 is part is removably held in the tank body molding mold 19, and in this state, the three embedding enlarged parts are embedded in the parison 40 by molding.
At the same time as blow molding, the mounting bracket 38 is integrally attached to the tank body 22.

This has already been shown in Japanese Patent Application No. 60-246948. After cooling the tank bodies 22 formed into different predetermined shapes in the mold cooling devices 8 and 9, the molds 6 and 7 are divided and taken out. J.

Then, on the hanger member 21 formed on the upper part of each tank body 22, a mark 25 is placed (
= J t, then move this to the tank body transfer robot h12.
, 13 to grasp the hanger clip 26 of a hanger conveyor or the like. This mark 25 may be incorporated in advance into one mold for forming the hanger part, or it may be pasted by an arp or the like after the mold is divided. The tank body transfer robots 12 and 13 are controlled to alternately transfer tank bodies 22 of different predetermined shapes to the next process I\ of the production line 1, for example. When the tank body 22 is transferred to the next process of the 9# production line 1 by the Kawaguchi bot 12.13, the tank body 22 is transferred to the deburring cells 14, 15.
The molds 6 and 7 are passed through the tank body 22 to remove the debris generated along the butt joints of the molds 6 and 7. The debris removed and collected by these debris removal cells 14 and 15 is conveyed to the crushing device 1G by a debris conveyance line 18 such as a belt conveyor. Then, the pari is crushed in this crushing device 16 and reused as a raw material as a powder, which is transported to a raw material cell 171\ and has a capacity of 11 tons. The tank body 22 that has passed through the deburring cell 14.degree. 15 is transferred by a hanger conveyor or the like to a weight inspection device 27'\, which is the next process on the production line 1. This 1,000M inspection is performed by removing the hanger clip 26 from the hanger conveyor while holding the hanger member 21 with the hanger clip 2G. This is because the mark 25 attached to the hanger member 21 serves as an identification mark for the discriminator @ 24 and also serves as a work reference point for machining and fusion bonding, so as to prevent misalignment. After the weight inspection, the hanger clip 26 is attached to the hanger conveyor, the products that passed the inspection are transferred to the layer thickness inspection device fif 28 for the next process, and the products that failed the inspection are transferred to the reject product conveyance line 29. The layer thickness inspection device 28 measures and inspects the layer thickness of the tank body 22 using fB sound waves while the tank body 22 is suspended on a hanger conveyor. When the tank body 22 is molded by a multilayer blow molding method, this layer thickness inspection also includes an inspection to confirm the presence of a barrier layer 41 formed in the synthetic resin layer of the tank body 22 to suppress fuel permeation. Do it in parallel. This ultrasonic confirmation inspection of the barrier layer 41 is performed by obtaining the knowledge that when ultrasonic waves pass through a joint 43 of resins 42 made of different materials, a portion of the ultrasonic waves is reflected, as shown in FIG. The partition wall plate of the tank body 22 is irradiated with ultrasonic waves, and the T-cow waves a, b, c of the irradiated ultrasonic waves S are
The presence or absence of the barrier layer 41 as an intermediate layer is determined and confirmed by detecting this. These barriers 1/11 and their ultrasonic inspection methods have already been developed in Japanese Patent Application No. 6 (L-2).
46951 and Japanese Patent Application No. 430-246946. After this layer thickness inspection, the products that passed the inspection are transferred to the cooling cell 31 for the next process, and the products that failed the inspection are transferred to the reject product transport line 30. Inside this cooling cell 31, the tank body 22 is cooled while being transferred. And tank body 2
2 is transferred to a cooling fan 32 connected to the end of the cooling cell 31, where it is completely cooled and temporarily stored. After cooling is completed, the tank body 22 is transferred to the discrimination device 24. At this time, since the tank body 22 has undergone the various inspections described above, different predetermined shapes are transferred in various orders. Judgment 8 above! The mark 25 attached to the hanger part +121 located on the upper part of the tank body 22 is read by the i position 24. The mark 25 is read by the discrimination device 24 by, for example, color discrimination, magnetic discrimination, optical discrimination, shape discrimination, etc. This mark 25 is set at the same position on the hanger conveyor even if the tank body 22 has a different predetermined shape, because the hanger member 21 with the mark 25 attached is formed on the upper part of the tank body 22. ing. By reading the marks 25, the discriminating device 24 discriminates and sorts each tank body 22 into a predetermined shape. Then, the tank bodies 22 which have been differentiated and valved into respective predetermined shapes are transferred to the second L cells 33 . . . which are adapted to the respective predetermined shapes. Processing suitable for each predetermined shape is carried out by using the mark 25 attached to the hanger part 4A21 formed on the upper part of the tank body 22 as a reference point for the work. Apply machining and fusion bonding [1] suitable for the shape. For machining, we perform 7JIl gc of the fuel injection part 1'', molding the threaded part, and hole + J[II for the pump mounting fat D, etc., and for fusion pressurization, we perform chamber fusion processing and elbow fusion. We perform processing, clamp fusion processing, etc. This is done by measuring the distances of these machining points from the mark 25 in advance as shown in FIG. This can be done by adjusting and setting (not shown). This machining is performed after the tank body 22 has been completely cooled, so it is performed by cutting. In this way, the tank body 22
After completing the machining and fusion processing suitable for each predetermined shape, the tank body 22 is transferred to the assembly cell 34, which is the next process. The assembly of the attachment parts in this assembly cell 34 is performed manually by a worker. After completing the assembly of the parts to be attached to the tank body 22, this is transferred to the airtight inspection device 35, 36'\. The airtightness test in the airtightness testing devices 35 and 36 is performed, for example, by immersing the assembled tank body 22 in a water tank. Therefore, the airtightness inspection devices 35 and 36 are formed in a size suitable for each predetermined shape of the tank body 22. After the airtightness inspection, the products that failed the inspection are removed, and the products that passed the inspection are transferred to the product unloading section 37, which is the final process of the WA construction line 1. At this product unloading section 37, the synthetic resin tank is removed from the hanger clip 26 of the hanger conveyor, the hanger member 21 formed integrally with the tank body 22 is removed, and then the synthetic resin tank is transported as a product. .

By the way, in the method of manufacturing a synthetic resin tank by blow molding of this embodiment, the above machining is performed on the tank body 22.
The process is carried out by cutting as it is installed after the cooling process has been completed. When machining is performed by cutting, there is a risk that chips generated by the cutting may get mixed into the tank body 22, and post-processing requires a lot of man-hours. Therefore, as shown in FIGS. 7, 8, and 9, when blow molding the tank body 22,
That is, it is conceivable to perform processing of the inlet part, molding of the threaded part, hole processing, etc. by cutting before the completion of cooling.

FIG. 7 shows a method of processing the injection port of a synthetic resin tank. As shown in the figure, this is rotatably attached to the gas inlet part 44 of one mold for forming the tank body, and extends outward for a predetermined length from this, and the inlet part 44 side is rotatable around the axis. A flange portion 46, which is enlarged in the radial direction on the side of the injection port 44, is integrally formed in the tank body 22, which is molded by providing a mold 45 for forming the tank injection portion, which has a stepped portion enlarged outward in the radial direction. After forming the injection port 44,
While rotating the tank injection port molding die 45 around the axis of the injection port 44, the burrs generated on the outer periphery of the tank injection port 44 are removed. This is done by separating the inlet molding die 45 from the mold. This has already been shown in Japanese Patent Application No. 60-246950.

FIG. 8 shows a method of forming a threaded portion of a synthetic resin tank. As shown in the figure, the mold 19 for forming the tank body has a cylindrical body with a bottom, and a spiral threaded portion 4 is formed on the inner circumference of the mold 19.
7 is connected to the mold 48 for molding a threaded portion with its mouth facing the inside of the mold 19 for molding the tank body to form four raised cylindrical portions on the tank body 22, and
After integrally molding the threaded portions 47 on the outer peripheries of the four cylindrical portions, the threaded portion molding mold 48 is rotated around its axis before cooling of the tank body 22 including the cylindrical portion 49 is completed. It is made by molding and releasing. This was already applied for in the 1980s.
-246949.

Figure 9 shows the method for drilling holes in a synthetic resin tank. As shown in the figure, a cylindrical mold 5o having a bottomed cylindrical shape is connected to the tank body mold 19 with its front end facing the inside, and the tank body 22 is connected to the tank body 22 from the outside. After integrally molding the raised bottomed cylindrical body part 51, and before the completion of cooling of the tank body 22 including the cylindrical body part 51, the bottomed cylindrical body is molded by the cylinder body forming mold 50. A cutter 53 is inserted into the bottom part 52 of the cylinder body 51, and the cylinder molding die 50 is rotated around its axis to release the mold, and at the same time or individually, the bottom part 52 is cut to form the cylinder part. 51 is integrally molded. This was first shown in Japanese Patent Application No. 60-246947.

As described above, if machining by cutting is performed during blow molding, it is possible to prevent the harmful effects of cutting such as chips being mixed into the tank body 22. In this case, the machining process in the processing cells 33 will not be performed.

In this way, even if the tank body 22 has several different predetermined shapes, the mark 25 attached to the hanger member 21 can be read by the discriminating device 24, and the tank body 22 can be classified and sorted into each predetermined shape. It can be transferred to a processing cell 33 suitable for each predetermined shape in one production line 1 connected by a hanger conveyor etc., and machining and fusing suitable for each predetermined shape can be carried out. Processing can be carried out.

Therefore, even if the tank body 22 has many different shapes, manufacturing equipment can be simplified, and the characteristic of synthetic resin tanks that can be molded into complex shapes can be utilized.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) Since tank bodies having several predetermined shapes are sorted and sorted into each predetermined shape by the discrimination device, machining and fusing suitable for each predetermined shape are performed on one production line. Since processing can be carried out, manufacturing equipment can be simplified even if the tank body has many different shapes, and costs can be reduced.

(2) (As mentioned in Section 11, costs can be reduced, so
Since there is no difference in cost from conventional press-molded metal tanks, the advantage of synthetic resin tanks, which can be molded into complex shapes, can be taken advantage of, and the utilization of synthetic resin tanks can be promoted.

[Brief explanation of drawings]

FIG. 1 is a schematic system diagram showing a production line used to carry out the method of the present invention, FIG. 2 is a side sectional view showing a method of forming a hanger member, and FIG. 3 is a plan view showing a synthetic resin tank. Figure 4 shows how to grasp the hanger part in the hanger clip.
Fig. 5 is a side sectional view showing the method of attaching the insert member to the tank body; Fig. 6 is the confirmation of the barrier layer of the partition wall plate of the synthetic resin tank by ultrasonic waves. Figure 7 is a side sectional view of the main part showing the method of inspection, Figure 7 is a side sectional view of the main part showing the processing method for the injection port of a synthetic resin tank, and Figure 8 is the method for molding the threaded part of a synthetic resin tank. Fig. 9 is a side sectional view of the main part showing the hole machining method for a synthetic resin tank. In the figure, 1 is the production line, 22 is the tank body, and 24 is the discrimination device. Leopard Applicant: Ishikawajima Harima Sha T Gyo Co., Ltd. Representative Patent Attorney: Shin Kinutani Kyoichi Yusei ≧ 岑, → 綜

Claims (1)

[Claims] Tank bodies having several predetermined shapes are molded by blow molding, and these tank bodies are cooled while being transferred to one production line. After cooling is completed, the predetermined shapes are discriminated and sorted by a discriminating device to form each tank body into each predetermined shape. A method for manufacturing a synthetic resin tank by blow molding, which comprises performing machining and fusion processing suitable for the shape of the tank.