JPS6362610A - Reamer and method of removing burr using it - Google Patents

Abstract

PURPOSE:To cut off a burr without remaining portions not cut, by rotating a reamer having a cutting portion comprising a taper portion and a portion of the same diameter in a substantial vertical posture to cause the tape portion to be brought into contact with burrs projectingly formed on an inclined surface of a member formed of macromolecule. CONSTITUTION:A reamer 1 comprises a cutting portion 2 and a portion 3 to be gripped by a rotating shaft, the cutting portion 2 comprising a portion of the same diameter 4, an upper taper portion 5 extending upwardly from the portion of the same diameter 4 and a lower taper portion 6 extending downwardly therefrom. A robot is actuated in such a manner that the reamer 1 griped by the rotating shaft is brought into contact with a member 33 formed of and covered by macromolecule. When a burr 35 projects from the surface of the covering member 33 above a horizontal level L passing through the center C of a ring portion 31, the lower taper portion 6 is moved in contact with the burr 35 so that a cutting blade 7 of the lower taper portion 6 passes through a tangential line passing through the burr 35, whereby the burr 35 is cut off clearly.

Description

Detailed Description of the Invention Object of the Invention (Industrial Field of Application) The present invention relates to a reamer, particularly the structure of a reamer used for deburring polymer molded products such as rubber and synthetic resin, and the use of the reamer. This relates to a method for removing burrs.

(Prior Art) In some techniques in which a polymer material is injected into a mold and molded, burrs are formed on the polymer molded product taken out from the mold. For example, as shown in FIG. 8, in a ring portion 101 of a steering wheel 100 of a vehicle,
A burr 102 is formed on the inner circumferential side and the outer circumferential side.

Conventionally, this burr 102 was removed manually, or
The present applicant takes a reamer having a specific structure on the rotating shaft of the motor (=i &p), operates the motor through a floating means, etc., and brings the reamer into contact with the burr 102. A technique (prior art) has already been proposed in which burrs are removed by removing burrs by removing burrs 102 which protrude horizontally from the surface of a covering material 104 which is applied to a ring part 101 as shown in FIG. This is an especially excellent method for scraping off.

(Problems to be Solved by the Invention) However, as shown in FIG. 10, the burr 102 is formed protruding upward from a straight sloped surface or a curved sloped surface, and as shown in FIG. If the burrs 102 are formed to protrude downward, the prior art may not be able to completely scrape off the burrs 102.

In the prior art, the equivalent diameter d of the cutting part 105 shown in FIGS. 13 and 14, that is, the diameter measured assuming that the cutting part 105 has a circular cross section, is Since the reamer 103 with the so-called equal diameter is held vertically and in contact with the burr 102 as shown in FIG. There are things you can do. This degrades the quality of the steering wheel 100.

Therefore, it is possible to adopt a method of tilting the reamer 103, but if the reamer 103 is tilted, it becomes difficult to adjust the contact pressure of the reamer 103 with respect to the covering material 104.

The purpose of the present invention is to provide a reamer that can scrape off burrs on the inclined surface of a polymer molded product, and also to provide a burr removal method that does not leave any uncut parts even when the reamer is used vertically. be.

Structure of the Invention (Means for Solving the Problems) The second invention employs a technical means in which the cutting part of the reamer is composed of an equal diameter part and a j-pa part. This is a technical means of rotating a reamer whose cutting part consists of a tapered part and an equal diameter part almost vertically, and then bringing the tapered part into contact with a burr formed protrudingly on the inclined surface of a polymer molded body. Adopt.

(Function) A reamer having a tapered portion whose Taper angle is approximately the same as the inclination angle with respect to the burr formed on the inclined surface of the polymer molded body is selected, and the reamer is attached to a motor or the like. Then, bring the reamer almost vertically close to the polymer molded body,
When the tapered part is brought into contact with the burr forming part while rotating the reamer, the rotating surface of the tapered part passes through a tangent line passing through the burr forming part on the inclined surface, so that the burr is neatly scraped off.

(Example) Next, an example in which the second invention and the second invention are simultaneously embodied will be described based on FIGS. 1 to 7.

As shown in FIGS. 1 and 2, the reamer 1 of this embodiment includes a cutting part 2 and a gripped part 3 gripped by a rotating shaft of a motor to be described later.

The cutting part 2 has an equal diameter part 4 formed in the center thereof,
An upper tapered part 5 extends upward from the equal diameter part 4 so that the equivalent diameter gradually decreases, and a lower tapered part 6 extends downward from the equal diameter part 1 so that the equivalent diameter gradually decreases. It is configured.

Roughly speaking, an auxiliary cutting portion 8 having an equivalent diameter smaller than the equivalent diameter i1 [ ) of the equal diameter portion 4 extends downward from the lower tapered portion 6 .

Further, a cutting blade 7 is formed around the cutting portion 2, and the front clearance angle α when rotating the reamer 1 in the right direction of the arrow X is approximately equal to the clearance angle.

Therefore, even if the reamer 1 is brought into contact with the polymer molded body described below, the cutting blade 7 will not dig in.1 The reamer 1 is held by the rotating shaft 11 of the motor 10 as shown in FIG. It has a function of scraping off the burr 35 formed on the covering portion 33 of the steering wheel 30 as a molecular molded body.

Note that the covering portion 33 covers the ring portion 31 and the spoke portions 32.
The burr 35 is formed by inserting the core metal 34 into the cellar 1 and covering it with a polymeric material in a mold consisting of an upper mold and a lower mold. Ru.

-〇- The motor 10 marked nb is connected to robots 1 and 2 as shown in Fig. 4.
0, the X @ arm 21, the Y-axis arm 22, the 7-axis air cylinder 23 attached to the tip of the Y-axis arm 22,
It is attached via a floating means supported by the seven-axis air cylinder 23 so that it can move in three-dimensional space with the leaf 1 in a substantially vertical position.

The floating means ``, as shown in FIG.
A ring-shaped locking part 43 that locks a part of the spring 42 is provided on the inner surface of the motor 10, and a spring 42 is installed around the motor
Ring-shaped locking part 1 attached to lock the other end
2, and the spring 42 is arranged in a zigzag shape between the two locking parts 12 and 43.

A base 24 is installed near the robots 1 to 22, and a steering wheel 30 is set on the base 24''.

Next, the functions and effects of this embodiment will be described. The robots I to 20 are operated so that the robots I to 20 mounted on the motor 10 and -71 come into contact with the covering material 33.

As shown in FIG. 6, when the burr 35 protrudes upward from the surface of the workpiece 133 from a horizontal plane passing through the center C of the ring part 31, the lower tapered part 6 of the reamer 1 is When the motor 10 is moved while contacting the burr 35, the cutting blade 7 of the lower tapered portion 6 passes on a tangent line passing through the burr forming area, so the burr 35 is neatly scraped off by the cutting blade 7.

The upper tapered part 5 of the reamer 1 has a burr 35 protruding downward from the surface of the coating +A' 33 below the horizontal plane 1- passing through the center C of the ring part 31 as shown in FIG. When the motor 10 is moved while bringing the burr into contact with the burr 35, the cutting blade 7 of the 17-part hooper part 5 passes on a tangent line passing through the burr forming area, so the burr 35 is neatly scraped off. If the burr 35 is located at a location that coincides with the horizontal plane 1-, the same diameter portion 4 of the leaf 1 can be brought into contact with the burr 35 as in the prior art.

In addition, since there is a part of the covering material 33 connected to the spoke part 32 or the ring part 32 that has a small curvature, when cutting off the burr 35 at that part, use the auxiliary cutting part 8.
is applied to that location.

By adopting the present invention, automatic deburring by a robot can be performed more reliably.

The present invention is not limited to the embodiments described above, and can also be implemented in the following embodiments, for example.

(1) The tapered portion 5 does not necessarily have to be sloped linearly, but may be sloped gently in a concave or convex shape. It is sufficient that the leaf 1 according to the present invention has a tapered portion 5.6 corresponding to the shape of the inclined surface on which the burr 35 is formed at J3 on the polymer molded body 33.

(2) The sloped surface of the polymer molded body 33 means not only a straight sloped surface but also a curved sloped surface, and for example, as in the above embodiment, the burr forming part has a gentle arc. It may be drawn and tilted.

(3) Two tapered portions 5.6 are provided if the burr 35 is formed unevenly (there is no need to tap them).

Effects of the Invention -〇 - As detailed above, the second invention exhibits the excellent effect of being able to cut off burrs formed on the inclined surface of a polymer molded body.

The second invention exhibits the excellent effect of being able to cleanly scrape off burrs formed on the sloped surface of a polymer molded body without leaving any scraps, with the reamer substantially straightened. If the second invention method is used, the deburring method can be completely automated using the robot 1 or the like.

[Brief explanation of the drawing]

1 is a side view of the embodiment of the first invention, FIG. 2 is a cross-sectional view of the same embodiment, and FIG. 4 is a partial side view showing an embodiment of the second invention, FIG. 5 is a partial sectional view taken along the v-■ direction in FIG. 3, and FIG. FIG. 7 is a side view of the reamer in contact with the ring section which is also cut in the radial direction, FIG. 8 is a sectional view of the steering wheel, FIG. 9 is a radial sectional view of the ring section, and FIG. Figure Gj is a partial cross-sectional view of a cladding formed with burrs facing upward; Figure 11 is a partial sectional view of a cladding formed with burrs facing downward; Figure 12 is a partial sectional view of a cladding formed with burrs facing downward; side view of the reamer in contact with the
FIG. 13 shows a side view of the prior art, and FIG. 14 also shows a cross-sectional view. 1... Reamer, 2... Cutting part, 4... Equal diameter part,
5.6...Tapered portion, 33...Polymer molded body, 35
...Flash, D...Equivalent diameter

Claims (1)

[Claims] 1. The cutting part (2) has an equal diameter part (4) and a tapered part (5, 6).
). 2. The reamer according to claim 1, wherein the equal diameter portion (4) has the largest equivalent diameter (D) among the cutting portions (2). 3. The reamer according to claim 1 or 2, wherein the equal diameter portion (4) is sandwiched between two tapered portions (5, 6). 4. Burrs (
35), in which the cutting part (2) consists of an equal diameter part (4) and a tapered part (5, 6), the reamer (1)
While rotating the tapered portions (5, 6) with the
A method for removing burrs, characterized in that the burr is brought into contact with the burr (35). 5. The deburring method according to claim 4, wherein the polymer molded body (33) is a steering wheel of a vehicle.