JPH0796173B2 - O-ring insertion method and device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for inserting an O-ring having an outer diameter slightly larger than the diameter of a work recess into the bottom of the recess.

(Prior Art) For example, there is a work W in which a shaft 2 is inserted in a case 1 as shown in FIG. A small-diameter step portion 2a is formed on the upper end portion of the shaft 2. Here, consider the case where the O-ring 3 for sealing is inserted into the bottom of the space recess A between the stepped portion 2a and the shaft hole of the case 1. Since the outer diameter of the O-ring 3 is slightly larger than the diameter of the shaft hole of the case 1, the O-ring 3 remains at the upper end of the shaft hole of the case 1 as shown in the figure. Therefore, it suffices to forcibly lower the cylindrical body 4 from above and push the O-ring 3 to the bottom of the recess A. However, simply lowering the cylindrical body 4 causes the O-ring 3 to move halfway through the case 1 and the cylindrical body 4. It will get caught in the gap between the and the O-ring 3 and damage the O-ring 3.
Even if you push the O-ring 3 to the bottom of the
A twisting force acts on the O-ring 3 and it is difficult to bring the O-ring 3 into close contact with the bottom of the recess A over the entire circumference. Therefore, in order to insert the O-ring 3 into the predetermined position accurately, it is necessary to lower the cylindrical body 4 while rotating it about the front-back, left-right, and vertical axes. When attempting to automate this insertion operation, it becomes very difficult to control the position of the cylindrical body 4.

(Problems to be Solved) The present invention has been made in view of the above circumstances, and the invention of claim (1) damages the O-ring 3 by using two types of cylindrical bodies having different lower end surface shapes. It is an object of the present invention to provide an insertion method capable of closely contacting the entire circumference of the bottom of the recess A without causing the above-mentioned problem. In the invention of claim (2), the O-ring 3 uses the first cylindrical body having a corrugated lower end surface. The purpose of the present invention is to provide an insertion device that can be brought into partial contact with the bottom of the recess A without damaging the O-ring 3 only by adsorbing and lowering the first cylindrical body.

(Means for Solving the Problems) The present invention relates to (1) a method of inserting an O-ring having an outer diameter slightly larger than the diameter of a work-work recess into the bottom of the recess, wherein the lower end surface is formed into a corrugated shape. 1) The O-ring insertion method, wherein the O-ring is pushed into the recess by the cylindrical body, and then the O-ring is pressed against the bottom surface of the recess by the second cylindrical body having a flat lower end surface so as to be in close contact. And (2) a device for inserting an O-ring having an outer diameter slightly larger than the diameter of the work recess into the bottom of the recess, the slide being supported by the controlled body so as to be finely movable in a horizontal plane, and attached to the slide. An outer diameter slightly smaller than the outer diameter of the O-ring, and a vertically extending first cylindrical body having a corrugated lower end surface, and vertically movably inserted into the first cylindrical body, and always urged downward. The O-ring insertion device, further comprising: a centering member for the workpiece recess formed therein, and an air suction passage for adsorbing the O-ring is formed between the centering member and the first cylindrical body. Is.

(Operation) In the invention of claim (1), the O-ring is pushed into the recess by the first cylindrical body having a corrugated lower end surface. At this time, since the O-ring bends along the corrugated shape, the O-ring has an outer diameter slightly larger than the recess diameter, but has little friction with the work and is quickly pushed into the recess. Then, the pushed O is pushed by the second cylindrical body having a flat lower end surface.
The ring is further pressed so that the O-ring is completely adhered to the bottom surface of the recess over the entire circumference.

In the invention of claim (2), the O-ring is air-adsorbed by using the first cylindrical body, the first cylindrical body is aligned with the center line of the recess by the centering member, and the O-ring is formed by the first cylindrical body in the recess. Push in.

(Example) R is an uncontrolled object of a known industrial robot which is positioned by, for example, XYZ rectangular coordinates. A slidable body 11 is provided on the controlled body R so as to be finely movable in a horizontal plane (XY plane). A first cylindrical body 12 and a second cylindrical body 13 having the same diameter are attached to the sliding body 11 in the vertical direction with a space therebetween. The outer diameter of each of the cylindrical bodies 12.13 is set to be slightly smaller than the outer diameter of the O-ring 3. The lower end surface of the first cylindrical body 12 is formed into a corrugated shape 12a, and the lower end surface of the second cylindrical body 13 is formed into a flat surface 13a.

Reference numeral 14 is a centering member for the concave portion A of the work W, which is vertically movably inserted into the first cylindrical body 12 and is always urged downward by a bullet 15 (compression spring) in this embodiment. The outer circumference of the lower end of the centering member 14 is tapered 14a.
In the state of being urged downward by the ammunition machine 15, the tapered portion 14a is in a position projecting from the lower end of the first cylindrical body 12. Further, a spherical protrusion 14b is provided at the center of the lower end of the centering member 14, and the protrusion 14b is fitted into a tapered hole 2b formed at the center of the upper end of the shaft 2 to form a first protrusion.
The centering of the recess 12 of the cylindrical body 12 is possible.
Reference numeral 16 is an air suction passage for adsorbing the O-ring 3 formed between the first cylindrical body 12 and the centering member 14, and 17 is an air hose connected to the passage 16, which is a known suction source (not shown). Connected to.

In addition, in the second cylindrical body 13 as well as the centering member 14,
The centering member 18 is provided so as to be urged downward by a bullet 19 and its detailed description is omitted.

Then, the controlled body R is position-controlled to position the first cylindrical body 12 at the stock position of the O-ring 3 which is not shown in the figure, and this is sucked by air. That is, the O-ring 3 is adsorbed between the lower end of the first cylindrical body 12 and the tapered portion 14a of the centering member 14.

Then, as shown in FIG. 2, the attracted O-ring 3 is positioned above the concave portion A and then lowered. Then, as shown in FIG. 3, the protrusion 14b is fitted into the hole 2b and the centering member 14 is centered with respect to the recess A. In this state, the O-ring 3 is pushed into the recess A by the first cylindrical body 12. . At this time, since the outer diameter of the O-ring 3 is slightly larger than the diameter of the recess A, the O-ring 3 is curved into a shape along the corrugated surface 12a of the first cylindrical body 12 and is pushed into the recess A.

Next, the controlled body R is raised to displace the first cylindrical body 12 from the recess A, and instead, the second cylindrical body 13 is positioned above the recess A as shown in FIG. 4 and then lowered. Then, as shown in FIG. 5, the protrusion 18b fits into the hole 2b and the centering member 18
Is in a state of being centered with respect to the concave portion A, and in that state, the O-ring 3 pushed into the corrugation is the second cylindrical body.
It is pressed by the flat surface 13a of 13. Ie O
The ring 3 is in close contact with the bottom of the recess A all around.

The above description is an embodiment, and for example, an air cylinder device may be used instead of the bullets 15 and 19, and the centering members 14 and 18 may be biased downward by a constant air pressure. Substitution with equivalents is also included in the technical scope of the present invention.

(Effect of the Invention) Since the present invention is as described above, according to the invention of claim (1), two types of cylindrical bodies 12, 13 having different lower end surface shapes are provided.
The O-ring 3 is inserted into the bottom of the recess A and securely adheres to the entire circumference without damaging the O-ring 3 between the cylindrical bodies 12 and 13 and the case 1 just by sequentially lowering the O-ring 3 into the recess A. Can be made. According to the invention of claim (2),
Only by lowering the first cylindrical body 12, the O-ring 3 adsorbed by the first cylindrical body 12 is curved along the waveform 12a without being caught in the gap between the cylindrical body 12 and the case 1, and the concave portion A is formed. It can be inserted with the bottom part in close contact, and the position control of the controlled object R is simple.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, and FIG. 1 is an overall schematic view of a controlled body. 2 to 5 are partial vertical cross-sectional views of the main part and also operation explanatory views. FIG. 6 is a conventional explanatory view. W ... Work, A ... Recess, R ... Controlled body, 1 ... Case, 2 ... Shaft, 2a ... Step, 2b ... Hole, 3 ... O-ring, 11 ... Sliding body, 12 …… first cylinder, 12a …… corrugated surface, 13 …… second cylinder, 13a …… flat surface, 14,18 ……
Centering member, 14a, 18a ... Tapered portion, 14b, 18b ...
… Protrusions, 15, 19… ammo.

Claims (2)

[Claims] 1. A method for inserting an O-ring having an outer diameter slightly larger than that of a work recess into the bottom of the recess, wherein the O-ring is pushed into the recess by a first cylindrical body having a corrugated lower end surface. After that, the O-ring is pressed against the bottom surface of the recess by the second cylindrical body having a flat lower end surface to bring the O-ring into close contact.
Ring insertion method. 2. An apparatus for inserting an O-ring having an outer diameter slightly larger than the diameter of the recess of the work into the bottom of the recess, the slide being supported by the controlled body so as to be finely movable in a horizontal plane, and the slide. It is attached and the outer diameter is slightly smaller than the O-ring outer diameter,
Further, the centering is provided with a vertically extending first cylindrical body having a corrugated lower end surface, and a centering member that is vertically movably inserted into the first cylindrical body and that is always urged downward to the work concave portion. The O-ring insertion device, wherein an air suction passage for adsorbing the O-ring is formed between a member and the first cylindrical body.