JPH04201229A - Deburring device in blow molding - Google Patents

Abstract

PURPOSE:To solve the problem of the deformation and wall sink of a product with the deformation of a burr, and to produce a sound blow molded product having high quality by providing the outside of the pinch-off section of a blow molding die with a deburring means following up the blow molding die on mold clamping and opening operation, being operated singly after molding and cutting off the burr. CONSTITUTION:Burr holding members 6, 7 are annexed outside a pinch-off section 4 as a deburring means cutting off a burr 5. The burr holding members 6, 7 are mounted in such a manner that they follows up blow molding dies 2, 3 on the mold clamping and opening operation of said molding dies 2, 3, are operated singly after mold clamping and cut off the burr 5 extruded from the pinch-off section 4. A cylinder 13 is elongated and operated at fixed timing after mold clamping and moves the burr holding member 7 to the blow molding die 2 side, and the burr holding member 6 is shifted in the same direction under the state in which the closing of a holding section 8 is held while compressing a spring 14 with the movement of the burr holding member 7. The pinch-off section 4 and the burr holding section 8 generate stagger, and the burr 5 extruded into a burr escaping space 11 is bitten off from a root (a pinch-off section outlet).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a blow molding apparatus including a deburring device that efficiently removes burrs generated during blow molding.

BACKGROUND ART As shown in FIGS. 1 and 2, when a three-dimensional cylindrical product 1 such as a filler tube for a vehicle fuel tank is blow molded, the entire circumference of the pinch-off part 4 of the blow mold 2°3 is A burr 5 is generated, resulting in a so-called line burr shape.

Conventionally, water is passed through the water pipe 6 provided in the blow molding mold 2.3 while the mold clamp is held, and the product 1 is water-cooled with burrs.
Furthermore, after demolding, air cooling is performed to mainly remove the heat retained by the burr 5,
After that, the burr is trimmed using a special trim machine.

Problems to be Solved by the Invention As mentioned above, in the past, an expensive dedicated trimming machine was required, which caused a burden on equipment costs, and cooling was performed with burrs remaining, which took a long time to cool, and air cooling after demolding was required. The dump space for this will also increase.

In addition, the product part is cooled quickly because it is brought into close contact with the mold by blow pressure, but the burr remains at a high temperature forever because it is not in close contact with the mold. In addition to the fact that the temperatures of the product part and the burr part are extremely different, there is a problem in that the deformation of the burr follows the deformation of the burr, resulting in deformation of the product and thinning of the meat. It is difficult to sufficiently suppress this burr deformation even if a specially manufactured forcing jig is used, and this burr deformation also causes problems of uneven trimming and poor trimming.

The present invention aims to effectively solve the above-mentioned problems in blow molding.

Means for Solving the Problems In order to achieve the above object, the present invention includes a deburring means that is attached to the outside of the pinch-off part of the blow molding die and moves in accordance with the closing and opening of the blow molding die, and the deburring means It is configured to be installed so that it operates independently after mold clamping to remove the burr pushed out from the pinch-off part.

Further, the present invention has a structure in which the above-mentioned burr removing means is attached to the outside of the pinch-off part of the blow molding die, and a groove for forming an ear on the product is provided along the inside of the pinch-off part to suppress the thinning caused by the above-mentioned burr removal. This is what I did.

As described above, the present invention operates the deburring means to extrude the deburr from the pinch-off portion at an appropriate timing after the blow-molding mold has been clamped, preferably after the pinch-off portion after the mold clamping has been cooled. Remove the burr. Therefore, the product can be efficiently cooled in the mold without any burrs, and the cooling time can be shortened.

Similarly, air cooling outside the mold after demolding can be reduced, or even if air cooling is used, the cooling time can be shortened, and the dump space for air cooling has burrs that occupy approximately the same area as the product. Since it is not used, it can be reduced to a large width and efficient cooling can be performed.

The problems of deformation, plate thickness change, and wall sink caused by cooling inside the mold to promote solidification of the product can be fundamentally solved by removing burrs during mold clamping.

EXAMPLES Hereinafter, examples of the present invention will be explained based on FIGS. 3 to 6.

The product 1 to which the present invention is preferably applied is, for example, a filler tube in a vehicle. This filler tube has a three-dimensional shape and produces a high-area burr 5 all around the pinch-off portion 4 around the special blow molding molds 2 and 3.

In FIGS. 3 and 4, a burr holding member 6.7 is attached to the outside of the pinch-off portion 4 as a burr removing means for removing the burr 5. This burr holding member 6゜7 is connected to the blow molding die 2,
The pinch-off portion 4 is arranged so as to surround the peripheral side surface of the mold 2.
It has a burr holding part 8 communicating with the outlet of the burr holding part 8.
It has outer end portions 10 extending in a direction perpendicular to the mold clamping direction, and the outer end portions 10 are spaced apart from each other to define a burr escape space 11.

The burr holding member 6.7 moves to follow the mold 2.3 during the clamping and opening operations of the blow mold 2.3, and operates independently after the mold is clamped to remove the burr 5 pushed out from the pinch-off section 4. Set up to perform the ablation.

In order to perform the above operation, one of the burr holding members 6
is provided on the side surface of one blow molding die 2, and the other burr holding member 7 is provided in contact with the side surface of the other blow molding die 3 so as to be slidable in the mold clamping and opening directions. A guide rail 12 is provided on each side to guide the sliding movement of the burr holding member 7, and one of the burr holding members 6 is moved via a pneumatic or hydraulic cylinder 13 that is telescopically operated in the mold clamping and opening directions. It is attached to a mounting plate 17 extending behind one blow mold 3, and the other burr holding member 7 is attached to a mounting plate 17 extending behind the other blow mold 2 via a spring 14 or cylinder that expands and contracts in the mold clamping and opening direction. It is resiliently supported on the plate 16.

Further, a guide pin 15 is provided which penetrates the outer end 1o of the burr holding member 6.7, and the burr holding member 6.7 is guided by the guide pin 15 and the guide rail 12. Obtains the movement of F.

As shown in FIG. 3, the burr clamping member 6-7 forms a continuous state with the pinch-off part 4 when the burr clamping part 8 is closed during mold clamping, and the cylinder 13 and the spring 14 (or The cylinder) serves as a means for generating a counterforce that crushes (pinches) the burr 5 pushed out from the pinch-off part 4 while keeping the burr holding part 8 continuously closed with the pinch-off part 4. And the cylinder 13 is 'f
%4 As shown in Figure 4, the burr clamping member 7 is extended at a certain timing after the mold is clamped and moved to the blow molding die 2 side, and as a result, the burr clamping member 6 compresses the spring 14 and the clamping part 8 are moved in the same direction while maintaining the closed position. As a result, the pinch-off part 4 and the burr holding part 8 create a misalignment, and the burr 5 pushed out into the burr escape space 11 is eaten away from the root (outlet of the pinch-off part).

Therefore, the product 1 molded by blow pressure in the blow mold is cooled in the mold with the burr 5 removed, and solidification is promoted. Reference numeral 18 denotes a water cooling hole provided in the blow molding die 2.3, and a similar water hole 19 is also provided in the burr holding member 6.7 to cool the burr 5 in the burr escape space 11. Tear off the above ingredients and cool until warm.

FIG. 5 shows an example in which a cutting blade 20 is used as a burr removing means in place of the burr holding member 6.7. The cutting blade 20
is attached to the peripheral side surface of one of the blow molding molds 2, and is arranged so as to be moved to follow the mold closing and opening operations of the blow molding molds 2 and 3, and to remove burrs pushed out from the pinch-off part 4 at the outlet of the pinch-off part after mold clamping. do. This cutting blade 20 can be installed so as to be operated in a cylinder after mold clamping to remove the burrs. In this case, in order to ensure that the cutting blade 20 can remove the burrs, a blade receiver 21 made of copper or Teflon material, for example, can be provided on the peripheral side surface of the other blow molding die 3.

Further, in FIG. 5, grooves 22 are provided inside the pinch-off portions 4 of the blow molding molds 2 and 3 for molding ears 1a along the pinch-off portions 4 in the product 1. At the same time as the mold is clamped, a part of the balisong is pushed into the groove 22, and the ear 1a is formed in the area that contacts the pinch-off part of the product 1. The outer edge of the ear 1a is held between the pinch-off parts 4, and the pinch-off part The above-mentioned burr removal is performed at the exit of No. 4.

The lugs 1a prevent the product from sinking due to the extrusion of burrs, and also serve as means for effectively preventing the sinking caused by the removal of burrs by the burr removing means.

Effects of the Invention According to the present invention, the burr pushed out from the pinch-off portion by the clamping of the blow molding die can be removed while the mold clamping is held. Therefore, the blow-molded product can be cooled inside the mold or outside the mold without burrs, and the cooling time can be greatly shortened and cooling can be performed efficiently.

In addition, since the burrs are removed and cooled in the mold, the problem of product deformation and sinkage due to the burr deformation is eliminated, and it is possible to produce healthy, high-quality blow-molded products.

In addition, it is possible to eliminate the conventional trimming after product demolding, and eliminate the burden on the equipment of a dedicated trimming machine. Overall, the process can be streamlined and product costs can be reduced, and Various advantages can be enjoyed, such as a significant reduction in dump space during cooling.

[Brief explanation of the drawing]

y, Fig. 1 is a cross-sectional view showing a filler tube molded state using a blow molding die showing a conventional example, Fig. 2 is a side view of the same filler tube, and Figs. 3 to 6 show an embodiment of the present invention. Fig. 3 is a partially cut-away front view showing a blow molding die to which a deburring means is attached, Fig. 4 is a front view showing a state in which burrs are removed by the deburring means, and Fig. 5 is a deburring machine. FIG. 6 is a cross-sectional view of a blow molding die showing the number of means, and FIG. 6 is a perspective view of the main part of the product showing an example of molding ears on the product. DESCRIPTION OF SYMBOLS 1... Product, 2.3... Blow molding mold, 4... Pinch-off part, 5... Burr, 6, 7... Burr holding member, 8... Burr holding part. [ Figure 3 Figure 4

Claims (2)

[Claims] (1) A deburring means is installed outside the pinch-off part of the blow mold, which follows the blow mold during mold clamping and opening operations, and operates independently after molding to remove burrs pushed out from the pinch-off part. A deburring device for blow molding featuring the following. (2) A deburring means is installed outside the pinch-off part of the blow mold, which follows the blow mold during mold clamping and opening operations, and operates independently after molding to remove burrs pushed out from the pinch-off part. A deburring device for blow molding, characterized in that a groove is formed along the inner side of the pinch-off portion to form a selvedge in the product.