JPH0243650Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ring seal finishing device for polishing and removing molding burrs formed on the outer periphery of an O-ring or the like.

[Problems that conventional technology and ideas try to solve]

Generally, ring seals such as O-rings are molded using a pair of upper and lower molds, but in the molded state, as shown in Figure 1, the inner and outer peripheral sides are formed by the mating surfaces of the molds. Since the barrier remains, if used as is, it will cause initial leakage. Finishing is often required for ring seals that seal important parts, and especially in the case of dynamic O-rings where the seal is on the inner or outer circumference of the ring, this barrier must be removed. be. However, ring seals made from rubber or resin are soft and very difficult to cut, and currently grinding is done by hand by feeding the ring seal against a grindstone rotated by a motor while lightly supporting it with your hand. However, since all the parts are ground, a large number of man-hours are required, and the finishing accuracy cannot be said to be sufficient. Further, in other automated devices, a jig for grinding the ring seal is required for each size of the ring seal, resulting in a problem that the number of jigs becomes extremely large.

This invention solves these conventional problems and
It is an object of the present invention to provide a ring seal finishing device that can grind the outer circumferential side of a ring seal with high efficiency and precision, and can greatly improve the workability of removing burrs from the outer circumferential side.

[Means to solve the problem]

In order to solve the above-mentioned problems, the ring seal finishing device of the present invention includes a pair of parallel horizontal holding rolls that hold the ring seal to be ground in a suspended position at an upper position on the inner diameter side with the lower half free; It is located at the center of the outer diameter side of the ring seal and comes into contact with the outer periphery of the ring seal from above so as to be able to approach and separate it, and while rotating the ring seal in a centerless manner in a vertical plane using grinding resistance, the burrs on the outer periphery are removed by grinding. The present invention includes a horizontal grinding wheel for grinding, and a pressing means for pressing the grinding wheel by bringing the grinding wheel into contact with the outer periphery of the ring seal so as to be able to approach and separate from the outer periphery of the ring seal.

[Effect]

The ring seal to be ground is held vertically in a hanging manner with the lower half free only by a pair of horizontal holding rolls, and a rotating grindstone approaches from above the center using a pressing means and makes light contact with it. By doing so,
The ring seal is guided to run smoothly, and since the lower half of the ring seal is suspended in a free state, elastic expansion and contraction between the pair of horizontal holding rolls can be absorbed. Furthermore, when the rotating whetstone approaches from above using the pressing means, when it comes into contact with the upper semicircular arc part of the ring seal between the pair of holding rolls, this upper semicircular arc part bends elastically like a beam on both sides, producing an elastic repulsion force. It comes into contact with the rotating grindstone with a delicate contact pressure.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments.

In Fig. 2, reference numerals 1 and 1 refer to a pair of parallel horizontal holding rolls that hold a ring seal 2 such as an O-ring to be ground in a suspended manner at an upper position on the inner diameter side thereof, and are on the same horizontal line. located at predetermined intervals. The holding rolls 1, 1 are structured to freely and lightly rotate around the shaft 1a, and as shown in FIG. 3, a plurality of ring seals 2 are placed in a suspended manner.

3 is a ring seal 2 held above the middle part between the pair of holding rolls 1, 1, that is, on the holding rolls 1, 1;
It is a rotary grindstone for grinding located at the center of the outer diameter side of the ring seal 2 and in contact with the outer periphery of the ring seal 2 so as to be able to approach and isolate it, and as shown in FIG. It is connected to a drive motor 9 via a transmission mechanism 8 consisting of a belt 7 and the like, and is detachably attached to the high speed spindle unit 4 so that it can be replaced. The drive unit is reciprocated up and down by the pressing means 15. That is, as this pressing means 15, the fluid pressure cylinder 10 is illustrated in FIG. In this way, the drive unit is reciprocated up and down by the pressing means 15, and the rotating grindstone 3 approaches the upper semicircular arc portion of the ring seal 2 and is lightly pressed. ... is rotated in a centerless manner by the grinding resistance, and the barrier on the outer periphery is removed by grinding.

To explain this specifically, after removing burrs on the inner circumferential side using an inner circumferential grinding device (not shown), the ring seal 2 is held by a pair of holding rolls 1, 1.
When a grindstone 3 rotated at high speed by a drive motor 9 and a high-speed spindle unit 4 is raised by a pressing means 15 such as a fluid pressure cylinder 10 and brought into contact with the outer periphery of the ring seal 2..., the ring seal 2... resists grinding by the grindstone 3. That is, it rotates in a centerless manner in the same direction as the rotation direction of the grindstone 3 due to contact friction. In this case, since the holding rolls 1 and 1 rotate lightly, the ring seal 2 does not rotate at all or does not reach an appropriate rotational speed, and the ring seal 2 has dents and wavy irregularities due to the grindstone 3 biting into it. do not have. In this way, the ring seals 2 are rotated at a slower peripheral speed than the grindstone 3, which satisfies the requirements for uniformly polishing the peripheral surface in the polishing technique (cylindrical).

Next, in the grinding state, when the grindstone 3 comes into contact with the outer periphery of the ring seal 2 by the pressing means 15, the ring seal 2 is bent between the pair of holding rolls 1, 1 according to the contact pressure, and this elastic Due to the repulsive force, the grindstone 3 grinds smoothly while maintaining the contact pressure with the ring seal 2. That is, the contact pressure of the grindstone 3 required for grinding is minute, and normal pressure control requires a sophisticated mechanism and is expensive, but in the present invention,
By utilizing the elasticity of the ring seal 2 itself, the pressing means 15 only needs to set the stroke, which is very simple. Further, since the ring seal 2 has a suspended shape with its lower half free and rotates in a centerless manner in a vertical plane, a more uniform, smooth and beautiful finish can be achieved.

Also, the ring seal 2 rotated by the grindstone 3
... generates inertia due to rotational centrifugal force, and rotates stably vertically without rolling. This is the same principle as that of a bicycle rim, and as shown in Fig. 6, the Y-Y direction of the ring seal 2 is
As a result, one point of the barrier will not shift relative to the grinding wheel 3 in the circumferential direction Z of the cross section (see FIG. 5). In other words, as the ring seal 2 rotates on the holding roll 1, the ring seal 2 itself becomes stable, and the barrier comes into contact with the grinding wheel 3 at one point, so that the ring seal 2 rotates on the holding roll 1 as shown in FIG. Rolling by ±α on the holding roll 1 causes the barrier to move in the circumferential direction Z, thereby preventing the inconvenience of widening the grinding range and causing defects.

In addition, the ring seal 2 on the holding rolls 1, 1...
When the ring seal 2 rotates centerlessly and increases its speed until it reaches almost the same speed as the grinding wheel 3, the ring seal 2 becomes deformed or eccentric due to inertia and begins to move irregularly. In order to prevent this, it is preferable to attach a brake mechanism (not shown) to the pair of holding rolls 1, 1 to provide resistance to rotation, or to rotate the holding rolls 1, 1 at a constant speed as drive rolls. It is also effective. That is, braking force is applied to the ring seal 2 by the pair of holding rolls 1, 1. Now, as shown in Fig. 2, when the speed V _p of the ring seal 2 exceeds the surface speed V _r of the holding roll 1, a contact friction force P ₁ is generated between the two and acts on the ring seal 2 as a brake. Therefore, even if the contact pressure P ₂ of the grindstone 3 is increased, the ring seal 2 rotates at a constant speed V _p .

If the interval between the holding rolls 1 and 1 is adjustable, the optimum interval can be set according to the diameter of the ring seal 2, and the ring seal 2 can be adjusted over a wider range from small diameters to large diameters. can be retained. Even when the distance between the pair of holding rolls 1, 1 is adjustable in this way, it goes without saying that the holding rolls 1, 1 may be of either a free rotation type or a driven roll type. Furthermore, although the pressing means 15 moves the grinding wheel 3 up and down with respect to the holding rolls 1, 1 in the above-mentioned embodiment, the present invention It is preferable as a modification of .

In addition, the present invention is not limited to the ring seal 2 having a circular cross section, but can also be applied to ring seals 2 with various cross sectional shapes, and the barrier does not necessarily have to be located at the center of the outer periphery; for example, it may have a square cross section. In this case, it is also possible that the barrier protrudes obliquely from the corner of the outer periphery. And pressing means 15
Of course, any other known vertical movement mechanism may be used in place of the fluid pressure cylinder 10.

[Effect of idea]

The present invention has the following significant effects.

The ring seal 2 to be ground is held vertically in a hanging manner with its lower half free only by a pair of parallel horizontal holding rolls 1, 1, and is rotated by a pressing means 15 from above the center. By lightly contacting the grindstone 3, the grinding wheel 3 is guided to run smoothly, and the entire outer circumference is ground uniformly without undulations, resulting in a high-precision finish.

At this time, since the lower half of the ring seal 2 to be ground is in a free state, the elastic expansion/contraction and deformation between the holding rolls 1, 1 of the ring seal 2 can be absorbed.

The upper semicircular arc portion of the ring seal between the pair of holding rolls 1, 1 is elastically bent like a beam on both sides by the grinding wheel 3 approaching from above by the pressing means 15, and the elastic repulsive force causes the grinding wheel to 3, it comes into contact with a delicate contact pressure, making it possible to grind with high precision.

(For the same reason) the pressing means 15 does not require a sophisticated mechanism for delicate contact pressure control. That is, the elastic deflection and elastic repulsive force of the upper arc of the workpiece itself are skillfully utilized.

This is an excellent idea with remarkable effects.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing an example of a ring seal;
Fig. 2 is a simplified front view showing one embodiment of the present invention, Fig. 3 is a cross-sectional view showing the state in which the ring seal is held on the holding roll, Fig. 4 is a simplified side view showing an example of the grindstone drive unit, and Fig. 5 is a simplified front view showing an example of the present invention. This figure and FIG. 6 are sectional views for explaining the operation during rotation of the ring seal, respectively. 1...Holding roll, 2...Ring seal, 3...
... Grindstone, 15... Pressing means, a... Burr.

Claims (1)

[Scope of utility model registration request] A pair of parallel horizontal holding rolls 1, 1 that hold a ring seal 2 to be ground in a hanging manner with the lower half free at an upper position on the inner diameter side, and the ring seal 2.
... is located at the center of the outer diameter side of the ring seal 2 and contacts the outer periphery of the ring seal 2 from above so as to be able to approach and separate the ring seal 2 from above, and rotates the ring seal 2 in a centerless manner in a vertical plane due to grinding resistance. a horizontal grinding wheel 3 for grinding and removing the horizontal grinding wheel 3;
A ring seal finishing device comprising a pressing means 15 for pressing a ring seal 2 by bringing it into contact with the outer periphery of the ring seal 2 so as to be able to approach and separate the ring seal 2.