JPS6130317A - Deburring reamer - Google Patents

Abstract

PURPOSE:To enable sure deburring without accumulating removed burr in a groove between cutting edges, by setting the edge-perpendicular relief angle and axis-perpendicular rake angle of a reamer at about 0 deg. and 15-75 deg., respectively, and shaping the cross section of the groove as U or V. CONSTITUTION:The edge-perpendicular relief angle and axis-perpendicular rake angle of a deburring reamer are set at about 0 deg. and 30-50 deg., respectively. The cross section of each groove 2 of the reamer is shaped as U. The width of the top of the groove 2 and its depth AE are set at 2-3mm. and about 1.5mm., respectively. The angles AEF, FGL of both the bottom corners of the groove 2 are set at about 90 deg., respectively. The angle delta between lines EF, GF is set at about 8 deg.. To remove burr made on the inner and outer circumferential surfaces of a steering wheel made of urethane resin by rim molding, the reamer is attached to an air shooter so that the reamer is rotated at a speed of about 6-10 revolutions per sec. as the steering wheel is moved by about 30cm per min. Even if the removal of the burr is continued for about 100hr, the removed burr is not accumulated in each groove 2 of the reamer.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to improvements in deburring reamers.

In resin molded products, especially resin molded products that use a low viscosity reaction liquid such as rim molding, burrs are generated from the mating surfaces of the molds.

(Prior Art) Conventionally, burrs on resin molded products are often removed by the manufacturer using small force. Some parts are deburred using a regular reamer to remove burrs.

The reamer used for conventional deburring is the same as the reamer used for metal materials. This conventional lamer has a problem in that the burrs that have been scraped off accumulate in the grooves between the blades, making it impossible to remove the burrs in a short time.

[Purpose of the invention]

The present invention has been made to overcome the above-mentioned problems, and an object of the present invention is to provide a deburring reamer that prevents burr chips from accumulating in the groove and allows reliable deburring.

[Structure of the invention]

That is, in the deburring reamer of the present invention, the relief angle at right angle to the blade is approximately O thin, the rake angle at right angle to the axis is from 15 degrees to 75 degrees, and the groove between the cutting blades has a U-shaped cross section. -2222tech7'""asorsa.

In the deburring reamer of the present invention, the blade normal clearance angle is approximately 0 degrees. Here, the right angle relief angle of the blade refers to the angle of the reed part of the blade, and is the angle at which the tangent to the circle drawn by the tip of the blade intersects the line defined by the back of the blade. Therefore, a blade clearance angle of 0 degrees means that the back of the blade is at the same distance from the central axis of the reamer. The reason why the clearance angle at right angle to the blade is set to approximately 0 degrees is to avoid cutting off parts other than burrs on the resin molded product.

In the 14-hole reamer of the present invention, the rake angle perpendicular to the axis is 15 degrees to 75 degrees. Here, the axis-perpendicular rake angle refers to the intersection angle between a straight line passing through the center of the cutting edge and a straight line defined by the blade surface extending toward the center of the blade. This axis-perpendicular rake angle is 15 degrees to 75 degrees, more preferably 301 to 501 degrees.
& is. This axis-perpendicular rake angle has been confirmed through experiments, and is preferably 30 degrees to 50 degrees, particularly for reamers for deburring rim molding urethane resin.

The groove formed between the blades must have a U-shaped or U-shaped cross section. If the cross-sectional shape of this groove is a square shape and the bottom of the groove is an acute angle, burr chips tend to accumulate at the acute angle portion and often block the groove. Unlike U-shaped or U-shaped cross sections, there is no acute angle at the bottom of the groove, and by making the groove opening larger, burr chips can be easily discharged from the groove, allowing continuous deburring for a long time. becomes possible. According to experiments, the reamer diameter is 10 to 1
- About 2 mm, the number of blades is 6, and the width of the groove opening is 2 to 3 m.
It has been confirmed that when the reamer is m, it becomes an excellent deburring reamer.

The deburring reamer of the present invention is suitable for deburring rim-shaped urethane resin molded products. Note that the blade of the reamer may be on a straight line extending parallel to the axial direction, or may be twisted.

This deburring reamer is preferably held perpendicular to the rotating shaft, and the resin molded product to be deburred is placed on the side surface of the reamer to perform deburring. In this case, the scraped burr is discharged from the groove below the reamer, and the burr does not accumulate in the groove.

〔Effect of the invention〕

Since the deburring reamer of the present invention does not accumulate burrs in the groove between the blades, deburring can be carried out for a long time. In addition, since there is almost no scraping of the cheap resin molded product itself other than the five holes, it can also be used as a deburring reamer for automation.

(Example) Examples will be explained below.

A plan view of a deburring reamer according to an embodiment of the present invention is shown in FIG.
An enlarged sectional view of the blade portion is shown in FIG.

This deburring reamer has a total length of 7Qmm, a blade portion length of about 40n++n, a diameter of 10IllIR, and six blades 1 are formed on its side circumference. The back of multi-blade 1 is at center 0
It is on the same radius as . That is, the arc AS of the back portion of the blade 1 lies on the circumference with the radius being AO and the center being O.

Therefore, the clearance angle perpendicular to the blade is 0 degrees. The axis-perpendicular rake angle (angle EAB) α is 40 degrees. Groove 2 has a U-shaped cross section, a width of the frontage (part AK) of 2 mm, a depth of AEifil,
There is 5mmF. h, the bottom of the groove is the angle of both its corners, angle AE
F, angle FGL was set to 90 degrees. Angle δ between line EF and line GE
is about 8 degrees.

The deburring reamer of this embodiment has the above configuration.

This deburring reamer was used to remove burrs generated on the inner and outer side surfaces of a urethane resin handle formed by rim molding.

Attach this reamer to the near router and rotate at -6
~300 per minute at 10 times/second! I moved the handle and deburred it. As a result, deburring was carried out for 4 consecutive hours for 100 hours, but no problems such as accumulation of chips in the groove 2 of the deburring reamer were observed.

As another example, a deburring reamer was produced in the same way as the deburring reamer of the above example, with a diameter of 12111 m and a groove width of 3III111 and a groove depth AE of 2 + IIIl & Shi, which was expanded by about 1.2 times. . This deburring reamer was also used to deburr a rim-molded urethane resin handle. In the case of this deburring reamer as well, there were no problems such as accumulation of cut burrs in the grooves, and the deburring work was carried out smoothly.

[Brief explanation of drawings]

FIG. 1 shows a deburring reamer according to an embodiment of the present invention.
The figure is a plan view thereof, and FIG. 2 is an enlarged sectional view thereof.

Claims (4)

[Claims] (1) The clearance angle perpendicular to the blade is approximately 0 degrees, and the rake angle perpendicular to the axis is 15
A deburring reamer characterized in that the groove between the cutting blades has a U-shape or a U-shape in cross section. (2) The deburring reamer according to claim 1, wherein the axis-perpendicular rake angle is from 30 degrees to 50 degrees. (3) The deburring reamer according to claim 1, having a diameter of 10 to 12 mm, six blades, and a groove opening width of 2 to 3 mm. (4) The deburring reamer according to claim 1, which is used for urethane resin molded products.