JPH029847B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a seal body of a filter element used in an air cleaner for an internal combustion engine.

As shown in FIG. 1, the filter element 1 is made by folding a sheet of filter paper to form a filter paper body 2, and sealing the peripheral wall of the filter paper body 2 with side wallpaper 3 to form a filter body 4.
A sealing body is formed by bonding a foamed elastic material to the outer periphery of the lower end of the filter body 4, and the sealing body 5 is formed of a foamed elastic material such as foamed urethane. Filter body 4
A conventional process for joining a foamed elastic material to a material will be explained with reference to FIG.

The lower mold 21 has a groove 14' around the entire circumference consisting of an inner circumferential wall 12' and an outer circumferential wall 13', and an appropriate amount of foamed elastic material is injected into the groove 14', and immediately after that, a filter body is placed on the inner circumferential wall 12'. 4, and while pressing the filter body 4, the upper die 20 is placed above the groove 14' and in contact with the outer peripheral end 13'. The foamed elastic material is bonded to the filter body 4 by the foaming of the foamed elastic material injected into the groove 14'. Since air is released from the outer peripheral wall 13' of the mold 20 and the lower mold 21 as the foam is formed, a burr 5' is generated from the joint between the upper and lower molds, and the burr 5' is formed by joining the foamed elastic material to the filter body 4. After the object is removed from the mold, it is cut out manually, which has the disadvantage of requiring a large number of man-hours.

In order to solve these shortcomings,
No. 31750 discloses that a product containing granular caps made of melamine-impregnated paper is placed between an upper die and a lower die having cutting edges, the upper die is lowered, and the cutting edges of the upper die and the lower die are crossed to form a melamine-impregnated product. A device is shown that is designed to shear the burr-like fins that occur on paper.

However, in order to intersect the cutting edges, the upper die must compress the product, so there is a problem that it cannot be used for deburring products that have problems with deformation due to compression, such as the above-mentioned air cleaner for internal combustion engines.

In order to solve these problems, this application aims to solve A.
A C upper mold supported by an elastic body was provided between the upper mold and the upper mold having a blade part at the lower part, and the upper surface periphery was in contact with the C upper mold with the lower mold having the blade part formed on the outer periphery of the groove. A filter body is provided and the elastic body of the C upper die is expanded and contracted to cut the burrs on the filter body, so when the blades intersect, they are held by the C upper die supported between the elastic bodies. The filter body is not subjected to a strong force that causes deformation due to one elastic body contracting and the other elastic body stretching.

FIG. 2 is a cross-sectional view of a method of forming a seal body according to the present invention. The lower mold 11 is a rectangular plate with a smooth upper surface, and a groove 14 having a triangular cross section is cut on the upper surface over the entire circumference. Reference numeral 12 indicates an inner peripheral wall of the groove, and reference numeral 13 indicates an outer peripheral wall of the groove, and a blade portion 17 is formed at the outer peripheral edge of the end between the groove and the upper surface. Groove 1
The cross-sectional shape of 4 may be, for example, semicircular or square. The upper mold 10 consists of an A upper mold 6, a B upper mold 7, and a C upper mold 8. A upper mold 6 has a box shape,
A B upper mold 7 is attached to the entire circumference of the lower end. B
The upper mold 7 has an inverted L-shaped cross section with a convex portion on the lower side in which a blade portion is formed. The blade part 16 is provided on the outer peripheral edge of the lower end of the convex part, and is attached to the outer peripheral wall 13 of the lower die 11.
The blade portion 17 of the lower mold 11 forms a burr cutting mechanism 15. A C upper mold 8 having an inverted L-shaped cross section is supported by elastic bodies such as an upper spring 9 and a lower spring 9', and is disposed between the A upper mold 6 and the B upper mold 7. After injecting an appropriate amount of foamed elastic material into the groove 14 of the lower mold 11, the filter 4 is placed on the upper surface of the lower mold 11 with the lower peripheral edge of the filter 4 protruding to about half the width of the groove 14. do. Then, when the C upper mold 8 is placed on the upper periphery of the filter body 4, the B
The lower end of the convex portion of the upper mold 7 is arranged so as to close the remaining approximately half of the groove portion 14 of the lower mold 11.

At this time, gaps are created between the convex portion of the B upper mold 7 and the side wall of the filter, and between the blade portion 17 on the peripheral edge of the outer peripheral wall 13 of the lower mold 11 and the blade portion 16 of the B upper mold. Due to foaming, the foamed elastic material rises from the groove 14 to the outside through the spaces between the two points, and the foamed elastic material between the blades forms the burr 5', and then the filter body 4 and the B upper mold 7. The elastic body between them serves as a wall seal for the filter body 4. A foamed elastic material is bonded to the lower edge of the filter body 4 to form a seal 5.
After the body is formed and the foam elastic material has solidified, the third
As shown in the figure, when the upper die 10 is slid under pressure slightly downward, the blade portions 16 and 17 intersect and burr 5'.
cut. At this time, as the A upper mold 6 descends, the C upper mold 8 also presses the filter body 4, but the upper spring 9 is bent and the lower spring 9'
By stretching, the force applied to the filter body 4 in the height direction is weakened, and deformation of the filter body 4 is prevented. B
The pressing force on the seal body 5 caused by the downward sliding of the upper die 7 cuts only the burr 5' due to the contraction effect of the seal body 5 itself due to its elasticity, and does not damage the shape of the end plate 5. . Further, variations in the height of the filter body 4 and the pressure applied to the filter body 4 during foaming of the foamed elastic material can be absorbed by slightly increasing the elastic force of the springs 9, 9'.

As shown in FIG. 3, the A upper mold 6 and the B upper mold 7 are screwed together with mounting bolts 18, and are configured so that they can be removed when polishing the blade portion 16 of the B upper mold 7.

As described above, in the present invention, the C upper mold supported by upper and lower elastic bodies is disposed between the A upper mold and the B upper mold, and the C upper mold is placed between the C upper mold and the C upper mold, which is supported by upper and lower elastic bodies. The filter body held by the mold is placed, and the burrs on the sealing body caused by the foamed elastic material injected into the groove of the lower mold in advance are removed by a burr cutting mechanism consisting of the blade of the lower mold of the upper mold B. Since the filter body is held by the C upper die when cutting, the pressing force applied to the filter body is absorbed by the expansion and contraction of the elastic bodies placed above and below the C upper die, thereby preventing deformation of the filter body. can.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the filter element. FIG. 2 is a sectional view of a main part of a mold for molding the seal body of the present invention, and FIG.
The figure is an enlarged cross-sectional view of the main part during burr cutting. FIG. 4 is a sectional view of the main part of a conventionally used mold. 4... Filter body, 5... Seal body, 5... Burr,
6...A upper mold, 7...B upper mold, 8...C upper mold,
9,9'...Spring, 10...Upper mold, 11...
...lower die, 15...burr cutting mechanism, 16...blade section,
17...Blade.

Claims (1)

[Claims] 1. A B upper mold with a blade formed on the outer periphery of the lower end is fixed to the lower end of the box-shaped upper mold A, and an upper mold C supported by upper and lower elastic bodies is placed between the A upper mold and the B upper mold. The periphery of the upper mold is in contact with the upper mold C between an upper mold having an annular groove on the upper surface and a blade portion with which the blade of the upper mold comes into contact with the outer periphery of the groove. A filter is provided, and a foamed elastic material is injected into the groove of the lower mold and foamed, and the burrs generated between the outer periphery of the lower mold and the outer periphery of the B upper mold are removed by the blade of the upper mold and the blade of the lower mold. A method for molding a sealing body for a filtering element, in which the elastic body of the C-upper mold is expanded and contracted to hold the filtering body in a constant shape when cutting the filtering element.