JPH02256477A - Manufacture of rotary stand - Google Patents

Abstract

PURPOSE:To simplify the production process of a rotary stand by setting holes on an under ring, and coupling an upper ring by pressure for assembling. CONSTITUTION:Many holes 4 are circularly arranged in the guide groove 15 or 25 of an under ring 1 or an upper ring 2, and both rings 1 and 2 are arranged face to face across the balls 4 while the dropping of the balls 4 from the guide grooves 15 and 25 is prevented by a hooking means (e.g. grease) 5. Both rings 1 and 2 are pressed relatively in the coupling direction, peripheral walls of the rings 1 and 2 are elastically deformed, and the balls 4 are coupled into the guide grooves 15 and 25 of both rings 1 and 2 to obtain a desired rotary stand.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a rotating table used when rotating an article to perform work.

(Conventional Example) Conventionally, as shown in Fig. 7, the peripheral wall (
13) and the peripheral wall (25) of the upper ring (3), a rotary table is used in which a row of balls (4) is interposed.

It was convenient to place a cargo handling pallet on the rotating table and place articles (not shown) on the pallet, since the articles including the pallet could be rotated easily.

However, although the rotary table described above has excellent durability against radial loads, it has a problem in that it has poor durability against thrust loads. As is clear from Fig. 7, this is due to the same peripheral wall (13) of the under ring (1) and upper ring (2).
) (23) is formed almost perpendicular to the rotation plane of the rotary table, so that the guide grooves (15) and (25) formed on the opposing peripheral surfaces of the peripheral walls (13) and (23), This is because the contact area in the thrust direction with the row of balls (4) fitted between the guide grooves is significantly smaller than the contact area in the radial direction.

Furthermore, the assembly of the above rotary table is performed using the under ring (1).
After fitting the upper ring (2) into the hole (14) made in the under ring, fit the ball (4) between the peripheral walls (13) (23) of both rings, and after fitting the ball, The holes (14) had to be plugged, which was time-consuming and resulted in poor productivity.

Therefore, the applicant proposed a rotary table that is sufficiently durable against not only radial loads but also thrust loads, as shown in Figs.
issue).

The rotating table shown in Figures 1 and 2 above is an under ring (1).
is an inverted conical or conical shaped short peripheral wall (1
3), and the upper ring (2) has an under ring (
A conical or inverted conical inclined peripheral wall (23) that extends along the slope of the peripheral wall (13) of 1) and fits into the peripheral wall (13) from above.
has.

Guide grooves (15) (25) are formed around the ring on the opposing surfaces of each peripheral wall (13) (23), and a large number of balls (4) roll between both guide grooves (15) (25). movably interposed.

The peripheral walls (13) and (23) of both rings (1) and (2) are rotatably engaged through the ball (4) but are not separable.

Both rings (1) (2) rollably support the ball (4).
) The peripheral walls (13) (23) are formed in a conical or inverted conical shape, and the ball (4) can receive both radial load and thrust load at the same time, simplifying the structure. However, the ball (4) is inserted into the guide groove (1) of both rings.
5) Since the upper ring (2) and the under ring (1) roll while being fitted in the ring (25), there is no misalignment between the upper ring (2) and the under ring (1), and the ring can be used as a rotary table for precision work.

(Problems to be Solved) The present invention clarifies a method for easily manufacturing the rotary table shown in FIGS. 1 and 2 above.

(Means for Solving the Problems) The present invention has a conical or inverted conical peripheral wall, and the peripheral wall (13
) is recessed in the direction of fall of the peripheral wall over the entire length of the guide groove (1
5), an upper ring (2) having an inclined peripheral wall (23) along the inclination of the under ring, and a guide groove (25) recessed in the direction in which the inclined peripheral wall falls over the entire length of the peripheral wall. ) and the respective surrounding walls (13) (
23) are fitted into each other's guide grooves (15) (25) via rows of balls that are rotatably fitted into the guide grooves (15) (25) of the peripheral walls (13) (23) of both rings. A method of manufacturing a rotary table in which the side edge of the ball (4) is partially covered and hooked on the upper or lower side of the ball (4), and both rings are inseparably and rotatably engaged via the ball, and the - side ring (4)
1) Also, a large number of balls (4) are arranged in an annular manner in the guide grooves (15) (25) of (2), and the balls (4) are prevented from falling out of the guide grooves by the locking means (5), Both rings (1) and (2) are placed concentrically facing each other with the ball in between, and both rings are pressurized toward the other ring to elastically deform the peripheral walls of the rings to form guide grooves in both rings (1) and (2). (
25), the ball (4) is fitted into the hole.

(Operations and Effects) As described above, the balls (4) are lined up in the guide groove of one ring, and while the balls (4) are prevented from slipping from the guide groove, both rings (1) are placed with the balls (4) in between. ) (2) are arranged facing each other, and in this state, both rings are pressed against each other.

The circumferential walls (13) (23) of the under ring (1) and the upper ring (2) are bent in the direction in which the gap between the circumferential walls increases, and the ball (4) also fits into the other guide groove (25). .

When the ball (4) fits into both guide grooves (15) (25), the peripheral wall (13) (23) returns to its original shape, and both rings (1) and (2) engage with each other through the ball, and the ball (4)
) to prevent separation of both rings.

The peripheral walls (1) of both rings that rollably support the balls (4)
3) (23) is formed into a conical shape, and the ball (4)
) can receive both radial load and thrust load at the same time, simplifying the configuration.

However, the ball (4) is inserted into the guide grooves (15) (25) of both rings.
), the upper ring (2) and the under ring (1) will not be misaligned and can be used as a rotary table for precision work.

As described above, assembly can be achieved by simply setting the ball (4) in the under ring (1) and pressurizing and fitting the upper ring (2), and cost reduction can be achieved by simplifying the manufacturing process.

This cannot be achieved with the conventional rotating table consisting of a combination of an upper ring, an under ring, and a ball having a substantially vertical peripheral wall as shown in FIG. 7, and is the greatest feature of the present invention. This is an excellent effect not found in other countries.

(Example) The example explains the manufacturing method of a large turntable for cargo handling pallets, but by downsizing it, it is possible to implement small turntables used for painting vases, caring for bonsai, etc. Of course.

Both the under ring (1) and the upper ring (2) are formed by bending a shaped steel having a cross-sectional shape corresponding to the cross-sectional shape of each ring into a ring with a diameter of 2 m using a pengu, and welding both ends of the steel.

The under ring (1) has a horizontal ring part (11).

It consists of a peripheral wall (13) that protrudes upward from the inner peripheral edge of the ring portion in a short inverted conical shape.

The upper ring (2) consists of a horizontal ring part (21) and a circumferential wall (23) that protrudes in a short conical shape downward from the inner peripheral edge of the ring part.

The circumferential wall (13) of the under ring (1) is enlarged at the upper end, and the circumferential wall (23) of the upper ring (2) is reduced in diameter at the lower end along the circumferential wall (13) of the under ring.
The peripheral wall (23) of the upper ring (2) is fitted into the peripheral wall (13) of the under ring (1) with plenty of room.

The peripheral walls (13) and (23) of both rings are inclined by approximately 30' with respect to the rotation axis of the rotary table.

Horizontal ring part (11) (21) of both rings (1) (2)
)for.

A bolt hole (10) for fixing the rotary table to the floor surface and a bolt hole (20) for fixing a work table such as a pallet on the rotary table are provided.

A guide groove (15) (2
5) is formed. The guide grooves (15) and (25) are formed as round bottom grooves with a 150° arc along the curvature of the spherical surface of the ball (5), which will be described later.

A grease injection hole (17) is formed in the peripheral wall (13) of the under ring (1), and a grease nipple (not shown) is attached to the hole.

Approximately 30m between the guide grooves (15) and (25) of both rings
Balls (4) with a diameter of 374 inches are interposed at m pitches.

The ball (4) is attached to a synthetic resin retainer (3) shown in Figure 3.
) keeps the distance between adjacent balls (4) constant.

The retainer (3) has five ball accommodating holes (31) at equal intervals in the band (30), and bifurcated lip portions (33) on both longitudinal edges of the band (30). ), and the lip portion (33) (33) forms both rings (
1) Contact the peripheral wall (13) (23) of (2) to prevent dust and foreign matter from entering the rolling path of the ball.

The required number of retainers (3) are used by arranging them on the guide groove depending on the size of the ring.

Each guide groove (15) (25) of both rings (1) (2)
) slightly overlaps the ball upward and downward, and the amount of overlap W is about 4 mm. For this reason, even if the upper ring (2) is lifted, both rings are prevented from being caught by the outer edges (15a) (25a) of the guide groove via the ball (4) and separated.

Both rings (1) (2) rollably support the ball (4).
) The peripheral walls (13) (23) are formed in a conical or inverted conical shape, and the ball (4) can receive both radial load and thrust load at the same time, simplifying the structure. However, the ball (4) is inserted into the guide groove (1) of both rings.
5) Since it fits into (25) and rolls, there is no misalignment between the upper ring (2) and the under ring (1), and it can be used for turning and turning tables for precision work.

Next, the procedure for assembling the above rotary table will be explained.

As shown in Figure 4, the retainer (3) fitted with the balls (4) is arranged on the guide groove (15) of the under ring (1) without any gaps, so that the balls (4) do not slip from the guide groove (15). It is locked by the locking means (5).

The locking means (5) in the embodiment is grease, and the ball is coated with a large amount of grease, and the ball (4) is held in the guide groove (15) using the adhesive property of the grease, and the ball is held in the guide groove (15). falling out of the groove.

The lower outer surface of the peripheral wall (23) of the upper ring (2) is placed over the ball (4) (FIG. 4).

When the upper ring (2) is pressurized, the peripheral walls of both rings (1
3) (23) is bent in the direction in which the gap between the peripheral walls is widened, and the ball (4) also fits into the guide groove (15) (25) of the upper ring (2) (Fig. 2).

When the ball (4) fits into both guide grooves (15) (25), the peripheral wall (13) (23) returns to its original shape, and in this state, the outer edge (15a) of each guide groove (15) (25)
(25a) slightly overlaps the ball (4) in the direction of preventing it from coming out, so the ball (4) is caught on the side edges (15a) and (25a), preventing separation of both rings.

Although the rotary table can be completed through the above steps, it is desirable to further add the following steps.

As shown in FIG. 5, between the two positioning rolls (91) (91) of the known Pengu (9) and the correction rollers (92) (92) disposed facing each positioning roll so that they can approach and separate from each other,
Fit a part of the rotary table and attach the rotary table to the localization roller (91) (
91) on both sides of the receiving rolls (93) (93).

The portion of the rotary table protruding from the pengu (9) is supported by a plurality of stands (not shown) so as to be freely rotatable within a horizontal plane.

The movable pressing roller (94) is connected to the positioning roller (91) (9).
1), press the upper ring (2) with the movable pressing roller (94), and press the under ring (1).
are brought into contact with the localization rollers (91) (91).

The two positioning rollers (91) (91) are driven to rotate in the same direction, and the movable pressing roller (94) is driven to rotate in the opposite direction to the positioning roller (91).

Due to the rotation of the rollers, the upper ring (2) and the under ring (1) rotate in opposite directions.

The correction roller (92) is moved toward the positioning roller (91), and the circumferential wall (23) of the upper ring (2) is pressed outward by the correction roller (92).

As a result, the peripheral wall (23) of the upper ring (2)
It rotates while receiving a force in the direction of expanding the diameter, and both guide grooves (25
) (15) and the ball (4), the gap is eliminated, and the ball (4) and the guide groove (15) (25) fit better, and the ring groove ( 15) Even if (25) is not finished by cutting, the ball (4) smoothly slides into the guide groove (15) (2
5), it is possible to obtain a rotating table in which the upper ring (2) rotates smoothly.

In addition, the above under ring (1) and upper ring (2)
) The step of fitting the ball (4) into both the guide grooves (15) and (25) may be performed by relatively rotating both rings while pressurizing the peripheral wall of the outer ring inward.

Furthermore, when implementing a small rotary table, the under ring and upper ring can be formed by punching and bending with a press.

Furthermore, the guide grooves (15) (25) of the under ring and upper ring are formed on the spherical surface of the ball (4) as necessary after the peripheral wall (13) (23) is depressed into a groove shape by pressing. It is also possible to finish by carving out the grooves accordingly.

The present invention is not limited to the above configuration, and various modifications can be made within the scope of the claims.

[Brief explanation of drawings]

Figure 1 is a partially sectional perspective view of the rotary table, Figure 2 is a sectional view of the main parts of the rotary table, Figure 3 is a slope view of the retainer, and Figure 4 is a partial cross-sectional view of the rotary table.
The figure is an explanatory diagram of the assembly procedure, Figure 5 is a plan view of the turntable being corrected with a damper, Figure 6 is a cross-sectional view taken along line VI-VI in Figure 5, and Figure 7 is a cross-section of the main part of the conventional example. It is a diagram. (1)...Under ring (2)...Upper ring (13) (23)...Peripheral wall (15) (25)...Guide groove (3)...Retainer (4)... ball

Claims (1)

[Scope of Claims] [1] A guide groove (15) having a conical or inverted conical peripheral wall and recessed along the entire length of the peripheral wall (13) in the direction in which the peripheral wall falls.
an upper ring (2) having an inclined peripheral wall (23) along the slope of the under ring and a guide groove (25) recessed in the direction in which the inclined peripheral wall falls over the entire length of the peripheral wall; The respective peripheral walls (13) (23) of
are fitted into each other's guide grooves (15) (25) via rows of balls that are rotatably fitted into each other's guide grooves (15) (25), and the peripheral walls (13) (
23) The side edges of the guide grooves (15) and (25) partially overlap and catch the ball above or below, and both rings are irreparably and rotatably engaged with each other via the ball. A large number of balls (4) are arranged annularly in the guide groove of the under ring (1) or the upper ring (2), and the balls (4) are released from the guide groove by the locking means (5).
While preventing the rings from falling off, both rings are arranged concentrically facing each other with the ball in between, and both rings are relatively pressurized in the fitting direction, and the peripheral wall of the rings is elastically deformed to form the guide grooves (15) of both rings. ) A method for manufacturing a rotary table characterized by fitting a ball (4) into (25). [2] In the method for manufacturing the rotary table described in item 1, both guide grooves (15
) After fitting the ball (4) into (25), both rings are rotated relative to each other while pressing the inner circumferential wall outward or the outer circumferential wall inward. (1) (2) Guide grooves (15) (25) and balls (4)
) is a manufacturing method for a rotary table that is characterized by blending in.