JP2578525Y2 - Deburring mold - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deburring mold, and more particularly to a deburring mold for removing burrs that protrude into the outer and inner holes of a rubber molded product obtained by molding.

[0002]

2. Description of the Related Art When molding a rubber molded product obtained by molding, for example, a molded product 21 having a convex portion 22 and an internal hole 23 shown in FIGS. 2 (a) and 2 (b), a molding die is used. The excess rubber material is used to prevent the cavity from being unfilled.
The outer burr 25 protrudes from the inner hole 23, and a burr is formed in the inner hole 23, which becomes the inner burr 26.

The outer burrs 25 and inner burrs 26 formed in this manner are conventionally peeled off by hand or cut off with a blade such as scissors or a knife.
Into a jig, etc. prepared separately, and set the outer burr 25 and inner burr 26
Is pressed and the molded body 21 is punched to remove burrs.

[0004]

[Problems to be solved by the present invention] However, it takes time to perform deburring manually for each molded body, and it is difficult to remove deburrs with respect to a molded body having a complicated shape. In particular, inner burrs often cannot be removed cleanly, which is problematic in terms of mass production and quality.In addition, for compacts with simple shapes such as round and short shapes, press the burrs as described above. Although the method of punching a molded body is adopted, this method has a disadvantage that the molded body is damaged, the punching structure becomes complicated, and it takes time to switch to a molded body of another shape, and in particular, there is a disadvantage that inner burrs are formed. There is also a disadvantage that it is necessary to remove the inner burrs one by one even after punching.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a deburring mold which solves such disadvantages and disadvantages.
This has an outer periphery that matches the outer shape of the molded body and a pin hole that matches the inner hole shape.The lower mold on which the molded body is placed is fitted with the lower mold, and the outer and inner peripheral pins are fitted. Consists of an upper mold that forms a deburring blade, the plane passing through the cutting edge of the outer deburring blade is inclined with respect to the horizontal plane, and the cutting edge of the inner deburring blade has a conical shape. It is assumed that.

That is, the present inventor can remove burrs neatly without damaging even a molded article having a complicated shape, and can also remove inner burrs inside the molded article at the same time, and furthermore, very thin burrs or As a result of various studies to develop a deburring mold capable of removing even slight burrs formed in the concave portion on the outer periphery, the molded product was matched with the outer shape conforming to the outer shape of the molded product and the inner hole shape thereof. The outer and inner peripheral pins of the upper mold are placed on a lower mold having a pin hole, and the outer and inner peripheral pins of the lower mold are fitted with deburring blades. It is found that the outer peripheral burrs and inner burrs of the molded body can be easily removed with the deburring blade according to the present invention, and the plane passing through the cutting edge of the outer peripheral deburring blade is inclined with respect to the horizontal plane, and the cutting edge of the inner deburring blade The conical shape and This deburring is to complete the to the present invention confirm the more easily it can be carried out if Re. This will be described in more detail below.

[0007]

The present invention relates to a deburring mold, which has an outer periphery corresponding to the outer peripheral shape of the molded body and a pin hole conforming to the inner hole shape, and a lower mold for placing the molded body. The upper and lower dies are fitted with a lower die, and the outer and inner pins of the upper die are deburring blades. The plane passing through the cutting edge of the outer deburring blade is inclined with respect to the horizontal plane. The feature is that the cutting edge of the blade has a conical shape, but according to this, the outer peripheral burr in the molded body,
The advantage is that the inner burr can be easily and cleanly removed.

The deburring mold of the present invention is shown in FIG.
(B) and (c). This FIG. 1 (a)
FIG. 1 shows a deburring mold of the present invention comprising a lower mold 8 on which a molded body 2 formed of a rubber plate 1 is mounted and an upper mold 9 fitted to the lower mold 8. The molded body 2 has a convex portion 3 and an inner hole 4. The extra rubber material filled at the time of molding is formed as an outer burr 6 outside the outer periphery 5 of the molded body after molding. Is formed as an inner burr 7 on the upper surface.

The deburring mold of the present invention is used for removing the outer burr 6 and the inner burr 7, and includes a pin hole matching the outer shape of the molded body and an inner hole shape. A lower die 8 having a lower die 10 and an upper die 9 fitted into the lower die and having outer and inner pins serving as deburring blades 11 and 12 are provided. 9 is the lower mold 8
The edge of which constitutes an outer deburring blade 11, this pin serves as an inner deburring blade 12, and another pin serves as a rubber plate retainer 13. It is configured to be.

Therefore, when the compact 2 is placed on the lower mold 8, the pin holes 10 of the lower mold 8 are fitted into the internal holes 4 of the compact 2, and the outer shape of the lower mold 8 is Outer peripheral burr 6 that matches the outer shape and protrudes outside outer periphery 5 of the molded body
Comes out of the lower die 8, and is lowered from above the lower die 8 so that the upper die 9 is fitted to the lower die 8. The outer peripheral burr 6 is cut off and the inner burr removing blade of the upper mold 9 is removed.
12 allows the inner burr 7 of the molded body to be cut off.

In this case, in the deburring mold of the present invention, since the plane of the deburring blade 11 passing through the cutting edge is inclined by the inclination angle θ with respect to the horizontal plane, the upper die 9 is lowered. When the outer peripheral burr 6 is trimmed by cutting, the entire surface of the outer peripheral burr removing blade 11 does not cut the outer peripheral burr 6 at the same time, but cuts the outer peripheral burr 6 sequentially from the lowest part of the outer peripheral burr removing blade 11. Deburring can be easily performed without requiring any force to lower the mold 9.

The outer peripheral deburring blade 11 shown in FIG.
Is not particularly limited as long as deburring is possible,
If the inclination angle θ is too large, the stroke of the upper mold 9 becomes longer and the apparatus becomes excessively large. If the inclination angle θ is too small, a large pressing force is required at the time of deburring. And preferably 4 to 6 degrees.

The cutting edge of the inner deburring blade 12 provided on the upper die 9 is formed in a conical shape as shown in FIG. 1B, and the outer peripheral portion of the inner burr is formed inside. Since the deburring blade is flat, when the inner deburring blade 12 hits the inner burr 7, the inner burr 7 is pushed and the inner deburring blade 12 is pressed.
By pressing the entire inner circumference of the inner burr at the flat outer peripheral portion, the force of the inner burr removing blade 12 is uniformly applied to the entire inner burr 7, and
Is easily and cleanly punched.

The cutting edge angle α of the inner deburring blade 12 is not particularly limited as long as deburring can be performed. However, when the rubber having a low rubber hardness or the internal hole is large, the cutting edge angle α is 100%.
Below 140 degrees, the inner burr 7 is stretched by the cutting edge of the inner burr removing blade 12 and tears the inner burr 7 or the inner burr 7 remains. Since the inner burr 7 does not come out neatly because it is pushed at a time and some burr 7 remains,
140 degrees, preferably in the range of 120 to 130 degrees, but if the rubber is hard rubber having a rubber hardness of about 70 ° H or more and the internal hole is small, the cutting edge angle α is 20 to 100 degrees, Preferably, the angle is in the range of 60 to 90 degrees.

Further, the deburring mold of the present invention is formed by fitting the lower mold 8 and the upper mold 9 as described above, and the fitting of the lower mold 8 and the upper mold 9 is performed. In order to smooth the joints and remove burrs neatly, as shown in FIG.
As shown in (c), it is preferable to provide a fitting clearance g between the fitting of the two, and the size of this g is not particularly limited as long as deburring can be performed. mm, preferably in the range of 0.2 to 0.3 mm. In this case, if the pin hole 10 of the lower die 8 is tapered, the inner burr 7 can be smoothly removed.

The material of the deburring blade may be a known material such as a general structural rolled steel material or hard aluminum, but the inner deburring blade 12 is the most suitable when the upper die 9 is lowered. It is preferable that the inner burr has the same shape as the inner burr so that the inner burr in the formed body 2 can be removed by avoiding the convex portion 3 of the formed body before reaching the descent point.

[0017]

Next, embodiments of the present invention will be described. Example A hard aluminum having a thickness of 20 mm and an outer shape matching the outer shape of the molded body, and a punched inner burr was formed with a tapered hole so as to be easily dropped from the lower die, and a lower die was made. The outer periphery forms a peripheral deburring blade with a 30 mm thick aluminum plate, which is inclined 5 degrees to the horizontal plane.
The rubber plate retainer is cut out, and hard aluminum is further processed into an internal hole shape, and the cutting edge is a 120-degree conical shape, but the horizontal plane of 0.5 mm covers the entire circumference so that force is uniformly applied to the outer circumference of the inner burr While the deburring blade was screwed in,
An upper mold that fits with the lower mold with a fitting clearance of 0.25 mm was prepared.

Next, a molded body having an outer peripheral burr and an inner burr prepared by a separate mold is placed on the lower mold, and the upper mold is fitted to the lower mold from above. When pressed, the lower mold and the upper mold are fitted with clearance, so there is no damage to the mold, and the outer burr is removed by the outer burr removing blade, and the inner burr is removed by the inner burr removing blade at the same time with high working efficiency. I was able to.

[0019]

[Effect of the Invention] The present invention relates to a deburring mold, which has an outer periphery corresponding to the outer peripheral shape of the molded body and a pin hole conforming to the inner hole shape as described above, and mounts the molded body. A lower mold and an upper mold that fits into the lower mold and whose outer and inner peripheral pins serve as deburring blades, wherein a plane passing through the cutting edge of the outer peripheral cutting blade is inclined with respect to a horizontal plane. The inner deburring blade has a conical cutting edge, but according to this, the mold is not damaged, and the molded body is not damaged. The advantage is that the outer and inner burrs can be deburred at the same time, easily and more efficiently than the conventional manual deburring operation. In this case, light metal such as aluminum The mold can be made with It shall be easy to handle, the advantage is given that it is possible to work better workability in less time even in small lots.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view showing a use state of a deburring die of the present invention for deburring a molded body using upper and lower dies, and FIG. 1B is an upper die used in the present invention. 3C is a longitudinal sectional view showing the operating state of the inner deburring blade, and FIG. 3C is a longitudinal sectional view showing the operating state of the rubber plate retainer of the upper mold used in the present invention.

FIG. 2A is a plan view of a molded body molded by a mold,
(B) is a longitudinal sectional view along the line XX.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rubber plate, 2, 21 ... Molded body, 3, 22 ... Convex part, 4, 23 ... Internal hole, 5, 24 ... Molded body outer periphery,
6, 25 ... outer burr, 7, 26 ... inner burr, 8 ... lower mold, 9 ... upper mold, 10 ... pin hole, 11 ... outer burr removal blade, 12 ... inner burr removal blade, 13 ... rubber plate holder .

Claims (1)

(57) [Scope of request for utility model registration] 1. A lower mold having an outer periphery conforming to the outer peripheral shape of the molded body and a pin hole conforming to the inner hole shape, and a lower mold on which the molded body is mounted, and fitted to the lower mold to form an outer periphery and an inner periphery thereof. The peripheral pin consists of an upper mold that becomes a deburring blade, the plane passing through the cutting edge of the outer deburring blade is inclined with respect to the horizontal plane, and the cutting edge of the inner deburring blade has a conical shape. A deburring mold characterized by the following.