JP2014234171A - Tank and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank of which a molding accuracy of a mouth is high and which can be manufactured with a good productivity while suppressing increase of a cost of manufacture, and a manufacturing method for the tank.SOLUTION: A tank made of a resin has a mouth. A tank body is formed by a blow molding, and an annular member, which is formed by, for example, injection molding, is bonded by deposition to a neck part of the tank body formed corresponding to the mouth. Further, a clearance is formed between the annular member and the tank body at an inner peripheral end part and an outer peripheral end part of the annular member. An interval of the clearance is 0.1 mm to 0.5 mm. In addition, a flange-like part is formed to the neck part of the tank body, and a corner part of the neck part of the tank body is brought into contact with an inclined plane of the annular member and deposited thereto.

Description

  The present invention relates to a tank formed by blow molding and a method for manufacturing the same, and more particularly to improvement of a mouth portion.

  For example, a vehicle having a water-cooled internal combustion engine is provided with a reserve tank that stores cooling water overflowing from a radiator. For this type of reserve tank, a blow tank manufactured by blow molding is widely used (see Patent Document 1 and the like).

  Patent Document 1 discloses a reserve tank in which a tank body and a reserve pipe are integrated, and a method for manufacturing a reserve tank by blow molding. In the reserve tank described in Patent Document 1, a reserve pipe extending downward from the upper part of the tank body along the peripheral wall of the tank body is connected and integrated by a connecting portion between the tank body and the reserve pipe.

JP-A-7-324623

  By the way, in the reserve tank as described above, it is necessary to provide a water injection port (mouth) in the tank body, but in order to prevent liquid leakage from the cap at the mouth of the sealed type reserve tank, High precision molding is required. In particular, in the reserve tank, the inner surface (inner diameter) of the water injection port needs to be formed with high accuracy because the convex portion provided on the cap is pushed into the water injection port to ensure sealing and prevent liquid leakage.

  As described in Patent Document 1 and the like, blow molding is widely used for forming this type of reserve tank, but in the case of blow molding, the molding accuracy is not always sufficient, and some countermeasure is necessary. It is. For example, in the invention described in Patent Document 1, attempts have been made to improve the accuracy of the inner surface of the water injection port by inserting a mouth portion restricting body during blow molding. Because of this, it is the actual situation that sufficient accuracy cannot be obtained. Moreover, depending on the formation position of the water inlet, it may be difficult to insert the mouth restrictor. In that case, it is difficult to ensure the accuracy of the inner surface of the water inlet.

  Therefore, conventionally, the mouth of the tank after blow molding has been subjected to a cutting process according to the required accuracy. Specifically, in order to increase the accuracy of the top and neck of the tank mouth, cutting is performed manually one by one. This cutting process needs to be performed on the total number of molded tanks.

  In the method using the cutting process, manufacturing cost is required for manufacturing the tank, and the number of work steps is increased, which becomes a factor of remarkably reducing productivity. In addition, there is a high possibility that the accuracy varies depending on the skill level of the operator, and the quality may become unstable. Cutting accuracy is not always sufficient.

  The present invention has been proposed in view of such conventional circumstances, and provides a tank that can solve the problem of accuracy and can be manufactured with high productivity while suppressing an increase in manufacturing cost. In addition, an object is to provide a manufacturing method thereof.

  In order to achieve the above-mentioned object, the tank of the present invention is a resin tank having a mouth portion, the tank body is formed by blow molding, and an annular member is welded to the neck portion formed in the tank body. The mouth portion is configured by joining, and a gap is provided between the annular member and the tank body at the inner peripheral end portion and / or the outer peripheral end portion of the annular member.

  Further, the tank manufacturing method of the present invention is a method for manufacturing a resin tank having a mouth portion, wherein a tank body having a neck portion is formed by blow molding, and an inner peripheral end portion and / or an outer peripheral end of an annular member are formed. An annular member is welded to the neck portion of the tank body so as to have a gap between the annular member and the tank body at the portion, and the mouth portion is formed.

  For example, injection molded products can be molded with higher accuracy than blow molded products. Therefore, by welding the annular member formed by injection molding or the like to the neck portion of the tank main body to configure the mouth portion, high accuracy is ensured without requiring cutting work or the like. Further, since a gap is provided between the annular member and the tank main body at the inner peripheral end portion and / or the outer peripheral end portion of the annular member, the protrusion of the burr at this portion is eliminated.

  According to the present invention, the accuracy of the mouth can be ensured without performing cutting, and an increase in work man-hours and an increase in manufacturing cost can be suppressed. Therefore, a highly accurate tank can be manufactured with low cost and high productivity. In addition, since accuracy is ensured by injection molding, there is no variation in accuracy due to the skill level of the operator and the like, and it is possible to stably supply a high quality tank. Furthermore, in the tank of the present invention, burrs are not dropped into the tank, and burrs can be prevented from being mixed into the contents. Or the protrusion of the burr | flash to the outer peripheral side can be prevented, the touch is favorable, and the tank which a burr | flash does not fall to circumference | surroundings at the time of use can be provided.

The tank of embodiment is shown, (a) is a top view, (b) is a side view. It is sectional drawing which expands and shows an opening | mouth part. It is a schematic diagram which shows the clearance gap between an annular member and a tank main body. It is a schematic diagram which shows the clearance gap between the annular member and tank main body in the tank of other embodiment. It is a schematic diagram for demonstrating the attachment method of the annular member to the neck part of a tank main body, (a) shows the state before welding, (b) shows the state at the time of welding. It is a perspective view explaining the use condition of a jig | tool. It is a schematic diagram which shows the other example of the attachment method of the annular member to the neck part of a tank main body. It is a schematic diagram which shows the further another example of the attachment method of the annular member to the neck part of a tank main body.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a tank to which the present invention is applied and a method for manufacturing the same will be described in detail with reference to the drawings.

  The tank of the present embodiment is used as a reserve tank for storing a reserve liquid for a radiator that cools an automobile engine, for example. Therefore, a reserve pipe for discharging the reserve liquid or steam to the outside of the tank and maintaining the atmospheric pressure may be provided in the tank body, the cap, etc., but the description thereof is omitted here.

  As shown in FIGS. 1 (a) and 1 (b), the tank 1 of the present embodiment is formed by forming a water inlet (mouth) 3 in the tank body 2, and the water inlet 3 is a tank. The annular member 4 is welded to a neck portion 2 a provided in the main body 2. Moreover, in the water injection port 3, chamfering processing such as R chamfering is performed on the inner side of the top surface to improve the insertion property of a hose or the like at the time of water injection.

  The tank body 2 is formed by blow-molding a thermoplastic resin, and the neck portion 2a is formed in a cylindrical shape at the center of the upper surface. Although any resin material can be used as the thermoplastic resin, for example, a polyolefin resin such as polyethylene and polypropylene, a polyester resin such as polyethylene terephthalate, and a polyamide resin such as nylon can be exemplified. . A polyolefin resin such as polypropylene is preferable.

  In general, a reserve tank or the like is used with a cap attached to the water injection port 3. However, if the processing accuracy of the water injection port 3 provided in the tank main body 2 is low, it may cause liquid leakage or the like. For this reason, high accuracy is required for forming the water injection port 3. However, if the water injection port is integrally formed when the tank body 2 is blow-molded, it is difficult to ensure sufficient accuracy due to the characteristics of blow molding. Processing (cutting) is required.

  Therefore, in the tank 1 of the present embodiment, cutting or the like is performed by attaching an annular member 4 formed in advance by a highly accurate molding method such as injection molding to the neck 2a of the tank body 2 formed by blow molding. The high-precision water injection port 3 is configured without any problems.

  An injection molded product has higher molding accuracy than a blow molded product, and a product satisfying the required accuracy can be obtained without performing cutting or the like. Therefore, by attaching the annular member 4 formed by injection molding, accuracy can be ensured, and liquid leakage or the like does not occur when the cap is attached.

  An arbitrary resin material can be used for the annular member 4 that is an injection-molded product, as in the case of the tank body 2, but considering the welding to the neck 2 a of the tank body 2, the resin material similar to that of the tank body 2 is used. It is preferable to form. For example, when the tank body 2 is formed of a polyolefin resin such as polypropylene, the annular member 4 can also be formed of a polyolefin resin such as polypropylene, thereby ensuring good welding strength. Of course, the present invention is not limited to this, and the annular member 4 can be formed of a resin material different from that of the tank body 2 with priority given to, for example, processing accuracy.

  In the water injection port 3 having the above-described configuration, it is important to secure the mounting accuracy of the annular member 4. The annular member 4 is attached to the neck portion 2a of the tank body 2 by a technique such as ultrasonic welding. However, if the amount of pressing during welding is different, it is difficult to ensure dimensional accuracy. Therefore, it is preferable that the pushing amount can be accurately managed.

  In order to achieve this, in the tank 1 of the present embodiment, a collar-like portion is provided on the neck 2a of the tank body 1. FIG. 2 is an enlarged view of the vicinity of the water inlet 3 of the tank 1, and as shown in the figure, a hook-like portion 5 is provided at a position slightly retracted from the tip of the neck 2 a of the tank body 2. By providing the hook-shaped portion 5, a jig can be placed on the lower surface 5a to support it, and the amount of push-in during ultrasonic welding can be accurately managed.

  Further, as shown in FIGS. 1 (a) and 1 (b), a convex portion 6 is provided along the parting line PL on the neck 2a of the tank body 2 in relation to the bowl-shaped portion 5. Yes. By providing the convex portion 6 on the neck portion 2 a, the hook-shaped portion 5 is supported and reinforced by the convex portion 6. Although the pressing force is applied to the hook-shaped portion 5 when the annular member 4 is welded, the protrusion 6 reinforces the pin-shaped portion 5 to suppress variation in the amount of pressing due to the bending of the hook-shaped portion 5. Can do.

  The formation of the convex portion 6 is effective not only for reinforcing the flange-shaped portion 5 but also for facilitating removal of burrs. In blow molding, burrs are generated along the parting line PL. In the case of making a product, it is necessary to cut off the burrs. However, in the neck portion 2a of the tank body 2, the parting line PL is inserted into the back due to the formation of the hook-shaped portion 5, and it is difficult to remove the burrs. If the convex portion 6 is formed, the parting line PL becomes flush with the outer peripheral surface of the bowl-shaped portion 5, and the deburring workability can be greatly improved. Further, if the burr can be surely removed, it is possible to avoid a fixing failure due to the influence of the burr when the neck portion of the tank 1 is sandwiched between the fixing jigs.

  Furthermore, in the tank 1 of the present embodiment, the generation of burrs is suppressed by providing a gap between the annular member 4 and the tank body 2 (neck portion 2a).

  FIG. 3 is a view for explaining a state in which the annular member 4 is attached to the neck 2 a of the tank body 2. In the attached state, the inner peripheral surface 4a of the annular member 4 constitutes the inner wall of the water inlet 3 together with the inner peripheral surface of the neck portion 2a. In addition, an outer peripheral wall portion 4b having an inner diameter dimension slightly larger than the outer diameter dimension of the neck portion 2a is formed on the outer peripheral portion of the annular member 4 downward, and is positioned by the outer peripheral wall portion 4b. Thus, the annular member 4 is fitted into the neck 2a.

  A tapered surface 4d that is inclined at a predetermined angle is formed at a boundary portion between the outer peripheral wall portion 4b and the horizontal wall portion 4c of the annular member 4. The inclination angle of the tapered surface 4d is, for example, 45 °. During ultrasonic welding, the outer corner of the neck 2a of the tank body 2 contacts the tapered surface 4d of the annular member 4 and is welded at this portion. The center of the annular member 4 and the center of the neck 2a are positioned so as to coincide with each other by bringing the outer corner of the neck 2a into contact with the tapered surface 4d of the annular member 4.

  At this time, when the annular member 4 is pushed in a large amount and the lower surface of the horizontal wall 4c of the annular member 4 comes into contact with the upper surface of the neck 2a of the tank body 2, the end of the annular member 4 on the inner peripheral surface 4a side ( Burr may occur at the inner peripheral edge. The end of the annular member 4 on the inner peripheral surface 4a side is exposed to the inside of the container of the tank 1, and if burrs are generated here, there is a possibility that it will fall off and be mixed into the contents of the container.

  Therefore, in the tank 1 of the present embodiment, as shown in FIG. 3, a gap S is provided between the lower surface of the annular member 4 and the upper surface of the neck portion 2 a of the tank body 2 so that no burrs are generated in this portion. . By providing the gap S, the generation of burrs can be avoided, and mixing of the burrs into the contents due to dropping into the container can be prevented.

  Here, the interval W1 of the gap S is preferably 0.1 mm to 0.5 mm, for example. If the gap W1 of the gap S is too large, the contents may enter the gap S. Therefore, it is preferable to make the gap W1 of the gap S as small as possible. However, if it is set too small, it becomes difficult to control the amount of pushing during welding, and the lower surface of the annular member 4 is inadvertently set to the upper surface of the neck portion 2a. There is a possibility that burrs will occur.

  The form of the annular member 4 and the hook-like part 5 is not limited to this, and the hook-like part 5 can be provided at the tip of the neck part 2a of the tank body 2 as shown in FIG. In this case, the outer corner portion of the hook-like portion 5 provided on the neck portion 2a of the tank body 2 contacts the tapered surface 4d of the annular member 4, and is welded at this portion. Positioning the center of the annular member 4 and the center of the neck 2a so as to coincide with each other by bringing the outer corner portion of the flange-shaped portion 5 into contact with the tapered surface 4d of the annular member 4.

  Also in the example shown in FIG. 4, a gap S is provided between the lower surface of the annular member 4 and the upper surface of the neck portion 2 a of the tank body 2 so that no burrs are generated in this portion. Similarly, the interval W1 of the gap S is preferably 0.1 mm to 0.5 mm.

  The above is the configuration of the tank 1 of the present embodiment. Next, a method for attaching the annular member 4 to the neck 2a of the tank body 2 will be described by taking the embodiment shown in FIG. 4 as an example.

  FIG. 5A and FIG. 5B are drawings for explaining a method of attaching the annular member 4 to the neck 2 a of the tank body 2. As described above, the neck portion 2a of the tank body 2 is provided with the flange portion 5, and the annular member 4 is mounted on the tip surface 2b of the neck portion 2a on which the flange portion 5 is provided.

  In ultrasonic welding, an ultrasonic wave is applied while pressing the annular member 4. At this time, it is necessary to accurately control the pushing amount. The variation in the push-in amount becomes a factor that reduces the dimensional accuracy of the water inlet 3.

  Therefore, in the present embodiment, the flange-shaped portion 5 is used to accurately manage the amount of pushing of the annular member 4 so as to realize a highly accurate welding state. Specifically, when ultrasonic welding is performed, as shown in FIG. 5, the jig 7 is set so as to support the lower surface 5 a of the bowl-shaped portion 5.

  As shown in FIG. 6, the jig 7 has a form divided into two parts, and has an arcuate recess 7 a corresponding to the shape of the neck 2 a of the tank body 2. These jigs 7 are mechanically supported, and are inserted below the bowl-shaped part 5 and set so as to support the lower surface 5a of the bowl-shaped part 5 on the upper surface thereof. If the annular member 4 is pushed in this state, fluctuations in the push-in amount due to deformation of the hook-like portion 5 can be avoided, and the same push-in amount can be ensured.

  At the time of ultrasonic welding, the outer corner of the flange 5 provided on the neck 2a of the tank body 2 is brought into contact with the tapered surface 4d of the annular member 4, and welding is performed at this portion. At this time, by controlling the pushing amount, a gap S having a predetermined interval W1 (= 0.1 mm to 0.5 mm) is provided between the annular member 4 and the tank body 2 at the inner peripheral end of the annular member 4. The annular member 4 formed by injection molding is welded to the neck 2a of the tank main body 2 so as to have.

  As mentioned above, although embodiment which applied this invention has been described, it cannot be overemphasized that this invention is not what is limited to the above-mentioned embodiment, In the range which does not deviate from the summary of this invention, a various change can be added. Is possible.

  For example, in the previous embodiment, the annular member 4 is formed with the tapered surface 4d, and the outer corner portion 5b of the flange-shaped portion 5 is brought into contact therewith to perform ultrasonic welding, but as shown in FIG. A protrusion 8 may be formed on the lower surface of the annular member 4 (or the tip surface of the neck 2a), and ultrasonic welding may be performed using the tip of the protrusion 8. Also in this case, a gap S having a predetermined interval W1 (= 0.1 mm to 0.5 mm) is provided between the lower surface of the annular member 4 and the upper surface of the neck 2a of the tank body 2.

  Alternatively, in the previous embodiment, the outer peripheral wall portion 4b is provided in the outer peripheral portion of the annular member 4, but as shown in FIG. 8, the inner peripheral wall portion 4e is provided in the inner peripheral portion of the annular member 4, and the inner peripheral side Ultrasonic welding may be performed by bringing the inner corner 2c of the neck 2a into contact with the tapered surface 4f. In this case, a gap S having a predetermined interval W2 (= 0.1 mm to 0.5 mm) is provided at the outer peripheral end of the annular member 4.

  When burrs are generated on the outside of the container, there is a problem that the touch is bad during use. In addition, there is a problem that burrs fall off to the surroundings during use. In the case of this example, since the clearance S is provided at the outer peripheral end of the annular member 4, such inconvenience is solved.

DESCRIPTION OF SYMBOLS 1 Tank 2 Tank main body 2a Neck part 3 Water inlet 4 Annular member 5 Gutter-like part 6 Convex part 7 Jig

Claims (10)

A resin tank having a mouth,
The tank body is formed by blow molding, and an annular member is joined to the neck formed on the tank body by welding to form the mouth,
A tank having a gap between the annular member and the tank body at an inner peripheral end and / or an outer peripheral end of the annular member.   The tank according to claim 1, wherein the annular member is formed by injection molding.   The tank according to claim 1 or 2, wherein the gap is 0.1 mm to 0.5 mm.   The tank according to any one of claims 1 to 3, wherein a collar portion is formed at a neck portion of the tank body.   The tank according to any one of claims 1 to 4, wherein a corner portion of a neck portion of the tank body is brought into contact with and welded to an inclined surface of the annular member. A method of manufacturing a resin tank having a mouth,
Mold the tank body with neck by blow molding,
The annular member is welded to the neck portion of the tank main body so as to have a gap between the annular member and the tank main body at the inner peripheral end portion and / or the outer peripheral end portion of the annular member, and the mouth portion is formed. Tank manufacturing method.   The method for manufacturing a tank according to claim 6, wherein the annular member is formed by injection molding.   The method for manufacturing a tank according to claim 6 or 7, wherein an amount of pushing at the time of welding is adjusted so that an interval of the gap is 0.1 mm to 0.5 mm.   7. An annular member is welded to the neck of the tank body in a state where a collar is formed on the neck of the tank body and a jig is brought into contact with and supported by the lower surface of the bowl. The method for producing a tank according to any one of claims 1 to 8.   The method for manufacturing a tank according to any one of claims 6 to 9, wherein the welding is performed by bringing a corner portion of a neck portion of the tank body into contact with an inclined surface of the annular member.

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