JP2690641B2 - Roll die for drum rolling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope rolling machine for rope hoists, and more particularly, to an improvement of a drum rolling roll die for rolling rope grooves around the outer circumference of a hoist drum.

[0002]

Prior to the description of the present invention, the structure and operation of a rope hoist will be described with reference to FIG. 6, 1 is a hoisting electric motor, which is fixed to a main frame 2a.

A deceleration mechanism 3 is supported by the main frame 2b and is directly connected to the drum 4.

In the above structure, when the electric motor 1 is rotated, the lower hook 7 is passed through the shaft 5, the speed reduction mechanism portion 3 of the electric motor 1, and the rope 6 wound around the drum 4.
Goes up and down.

By the way, when a load is hoisted on the rope hoist, an unbalanced load is applied to the rope hoist so that the rope 6 is easily disengaged from the rope groove of the drum 4.

Further, even when the hoist traverses, the rope 6 tends to come off the rope groove of the drum 4 due to the swinging motion of the load.

Therefore, the rope groove depth of the drum 4 should be deep.

FIG. 8 shows the structure of the drum 4. The winding drum portion 8, the side plates 9a and 9b, and the spline boss 10 are all made of steel plates, and the members 8 to 10 are joined by welding.

The drum 4 is provided with rope grooves 11 (right-handed rope groove 11a and left-handed rope groove 11b).

The structure of the drum rolling machine and its operation will be described with reference to FIGS. 7, 9 and 10. The rolling machine comprises a bed 12, a headstock 13 and a roll unit 14. The roll die 15 (15a, 15b) is attached to the roll unit 14.

A spindle 16 is provided in the spindle stock 13, and the spindle 16 is rotated by an electric motor 17.

A mandrel 18 is fastened to the main shaft 16, and the drum 4 which is a workpiece is inserted into the mandrel 18 during the rolling operation.

Further, the drum 4 is provided with a fixing metal fitting 19,
It is fixed by the hydraulic cylinder 20.

Then, the roll cylinder 21 of the roll unit 14 presses the roll dies 15a and 15b against the drum 4, and the main shaft 16 is rotated by the electric motor 17 to roll-form the rope groove 11 described above.

The roll die 15a (same for 15b) is
As shown in FIG. 10, three drums 4 are installed at positions that divide the circumference of the drum 4 into three equal parts.

Further, the three roll dies 15a (1
5b is also the same) are arranged at positions sequentially deviated from the axial direction of the drum 4 by 1/3 of the rope groove pitch.

Further, the roll dies 15a, 15b
Are inclined by the lead angle θ of the rope groove 11 shown in FIG. 11 with respect to the axial direction of the drum 4.

The right-hand rope groove 1 is formed on the outer circumference of the drum 4.
When the 1a is rolled, the roll die 15a (the right-handed rope groove roll die 15a) is used, and when the left-handed rope groove 11b is rolled, the roll die 15b (the left-handed rope groove roll die 15b is used. ) Is used.

A series of operations for rolling the rope groove 11 on the outer periphery of the drum 4 in the above structure will be described. First, the fixing metal fitting 19 of the rolling machine is removed.

Then, the drum 4 is inserted into the mandrel 18, and the right end portion of the drum 4 is temporarily fixed by the fixing fitting 19.

Next, the hydraulic cylinder 20 is operated to fix the drum 4.

After that, the moving unit 22 moves the roll unit 14 to the cutting start point of the right-hand rope groove 11a of the drum 4.

Then, the rolling cylinder 21 presses the right-handed rope groove roll die 15a against the drum 4,
The main shaft 16 is rotated by the electric motor 17 to start rolling.

Since the right-handed rope groove 11a (same as the left-handed rope groove 11b) is formed in a screw shape as shown in FIG. 11, the roll unit 14 has the right-handed rope groove 11a.
According to the lead angle θ of a, the rope groove 11a is moved to the cutting end point.

Therefore, at this time, the rolling cylinder 21 moves the right-handed rope groove roll die 15a backward from the drum 4, and the moving device 22 moves it to the cutting start point of the left-handed rope groove 11b.

Next, the rolling cylinder 21 moves forward to press the left-handed rope groove roll die 15b against the drum 4,
The left-handed rope groove 11b is formed by rolling.

When the left-handed rope groove 11b is moved to the cutting end point, the left-handed rope groove roll die 15b is retracted from the drum 4 by the rolling cylinder 21, and the rolling / forming work of the drum 4 is completed.

After that, the roll unit 14 is moved to a place where it does not interfere with the attachment / detachment of the drum 4, and the hydraulic cylinder 20
Is released and the fixing bracket 19 is loosened.

Next, the fixing member 19 is removed, and the drum 4
Is removed from the mandrel 18.

Here, the shape of the conventional roll die 15 for forming the rope groove 11 on the outer circumference of the drum 4 is shown in FIG.

As shown in FIG. 5, on the outer periphery of the roll die 15, a plurality of protrusions 15-1, that is, a plurality of roll die rolling protrusions for rolling the rope grooves 11 on the outer periphery of the drum 4. 15-1 is provided.

[0032]

By the way, when a load is hoisted on the rope hoist, an unbalanced load is applied to the rope 6 so that the rope 6 is easily disengaged from the rope groove 11 of the drum 4, and even when the hoist traverses. As described above, the rope 6 is likely to be disengaged from the rope groove 11 of the drum 4 due to the swaying movement.

On the other hand, when the rope groove 11 is deeply formed on the outer periphery of the drum 4 using the conventional roll die 15 shown in FIG. 5, the root portion 15 connecting the rolling projections 15-1 and 15-1 is formed. -2 needs to be a circle with a small radius of curvature.

However, as described above, the rolling projection 15-
When the root portion 15-2 connecting between 1 and 15-1 is a circle having a small radius of curvature, large stress concentration occurs at this root portion.

The force acting on the roll die 15 will now be described with reference to FIGS.

The roll die 15 is a rolling cylinder 21.
Is pushed against the drum 4, and thus the roll die 15 receives a load as its reaction.

When the rope groove 11 of the drum 4 is formed between the plurality of rolling projections 15-1 and 15-1 of the roll die 15, the balance between the inside and the outside of the projection 15-1 is lost. , A force is generated to tear the protrusions 15-1 and 15-1 in the axial direction.

Further, since the drum 4 is strongly pressed against the mandrel 18 by the rolling projection 15-1 of the roll die 15, a force extending in the axial direction acts on the drum 4.

From the above, the imbalance between the inside and the outside of the rolling projection 15-1 is further increased, and the force for tearing the projections 15-1 and 15-1 in the axial direction is also increased. It gets even bigger.

The stress concentration factor in that case is shown in FIG.
As shown in FIG. 3, it increases in inverse proportion to the ratio ρ / r of the radius of curvature ρ of the root portion 15-2 of the roll die 15 and the radius r of the protrusion 15-1.

As described above, when the rope groove 11 is deeply formed on the outer circumference of the drum 4 by using the conventional roll die 15 shown in FIG. 5, that is, the root portion connecting the rolling projections 15-1 and 15-1. When 15-2 is a circle with a small radius of curvature, there is a drawback that a large stress concentration occurs at this root portion and the life of the roll die 15 is shortened. In the worst case, the rope is attached to the outer circumference of the drum 4. At the beginning of rolling the groove 11, the roll die 15 may be immediately damaged.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to roll the rope groove around the outer circumference of the rope hoist drum by deeply forming the rope groove depth of the drum to be processed, An object of the present invention is to provide an improved roll die for drum rolling, which makes it possible to prevent the rope from coming off the rope groove and to extend the life of the roll die.

[0043]

SUMMARY OF THE INVENTION The above-mentioned object is to provide a drum rolling roll die having a plurality of rolling projections.
A roll for forming the plurality of rolling projections on the outer circumference of the drum.
And individually divided at a position corresponding to the ridges of-loop groove molding the rolling projection dividing member, wherein each of the divided members is achieved Ri by the concatenating by mechanical coupling such as bolts bond.

[0044]

According to the present invention having the above structure,
Each rolling projection of the drum rolling roll die is
Each of them is individually molded as a dividing member at a position corresponding to the mountain portion of the rope groove formed on the outer periphery, and as in the conventional case, one rolling projection and another adjacent rolling projection are formed. Since it does not have an integral root portion that connects with the rolling projection, it is possible to easily manufacture a rope hoist drum with a deep rope groove depth, that is, a drum in which the rope does not easily come off the rope groove. Since the roots that connect the individual rolling projections are divided into the left and right, even if a large force is applied to the rope hoist drum during rolling, the roots that connect the left and right rolling projections are concentrated. No stress is generated.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. 1 and 2. Reference numeral 23 is a general term for a drum rolling roll die, and two rolling projections 23A-
1, 23B-1 are individually divided, and in the case of the present embodiment, the two rolling projection dividing members 23A, 23B are fastened by inserting the bolts 25 to the left and right sides at the side surfaces thereof. There is.

According to the present invention having the above structure, however, each rolling projection 23 of the drum rolling roll die 23.
Each of A-1 and 23B-1 is individually molded as a divided member, and as in the conventional case, an integral root portion that connects one rolling protrusion and another rolling protrusion adjacent thereto. Since it does not have a rope groove, it is possible to easily manufacture a rope hoist drum having a deep rope groove depth, that is, a rope in which the rope is hard to come off from the rope groove, and at the same time, the plurality of rolling projections 23A-1 and 23B. Since the root portion 24 connecting -1 is divided into left and right, (1) the roll die 2 is moved by the forward movement of the rolling cylinder.
3 is strongly pressed against the drum, and thus a large load is applied to the roll die 23 as a reaction, (2) In addition, the balance between the inside and the outside of the rolling projection 23A-1 (23B-1 is also the same). Is collapsed and a force is generated to tear the protrusions 23A-1 and 23B-1 (3) Further, the drum is strongly pressed by the mandrel, and the drum acts so as to extend in the axial direction. However, no concentrated stress is generated at the root portion connecting the rolling projections 23A-1 and 23B-1, and the life of the drum rolling roll die can be extended. Further, according to the present invention,
The protrusions 23A-1 and 23B-1 for forming are formed on the outer periphery of the drum.
Individually divided at the position corresponding to the mountain part of the rope groove to be formed
Therefore, the position corresponding to the mountain part of the rope groove is
Be the joint of the rolling projections 23A-1 and 23B-1
Therefore, when rolling the drum,
Rolling projections 23A-1 and 23B-1, which are the corresponding positions,
Even if a burr occurs at the joint of this, this burr is on the rope
Rope wear caused by burr hitting the rope without hitting
Due to repeated wear and, consequently, rope wear
It is possible to prevent accidents such as rope disconnection
You. In other words, when making roll dies for drum rolling,
Tighten the individual rolling projections 23A-1 and 23B-1
Even if they are attached and connected, they are not
Ledais is strong against the drum due to the advance of the rolling cylinder
It is pressed and therefore reacts with the roll die
Ri written a large load Te, rolling projection 23A-1 and 23B
A gap is created at the joint with -1, and there is burr in this gap.
Although it will occur, as mentioned above, the mountain part of the rope groove
Rolling projections 23A-1 and 23B-, which are positions corresponding to
Even if a burr occurs at the point where it matches with 1, this burr
There is no hit.

According to the above-mentioned embodiment, the rolling projection dividing members 23A and 23B may be formed in the same shape, and as a result, the material yield can be improved.

Further, according to the above-mentioned embodiment, since the rolling projection members 23A and 23B are fastened by inserting the bolts 25 into the right and left alternately on the side surfaces thereof, as clearly shown in FIG. In other words, since the bolt heads, which occupy a large area with respect to the side surface of the die, are arranged alternately on the left and right, the mounting pitch of the bolts 25 can be reduced to connect the rolling projection split members 23A and 23B with a large number of bolts 25. Therefore, the connection strength between the split members 23A and 23B can be increased.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, a male thread 26 is provided on the side surface of one rolling projection dividing member 23A, and this male thread 26 is provided with another thread. Tighten the female screw 27 provided on the side surface of the projection dividing member 23B.
And shows the case.

FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, a male screw 26 is provided on the side surface of one rolling projection dividing member 23A, and this male screw 26 is provided with another rolling member. The side surface of the projection dividing member 23B is fitted to the male screw 2
The case where the nut 28 is fastened to the tip portion of 6 is shown.

[0051]

The present invention is as described above. According to the present invention, when the rope groove is rolled around the outer circumference of the rope hoist drum, the rope groove depth of the workpiece drum is deeply formed. As a result, it is possible to provide an improved roll die for drum rolling, which makes it possible to prevent the rope from coming off the rope groove and to extend the life of the roll die.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a roll die according to the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a left half longitudinal sectional view showing a second embodiment of the roll die of the present invention.

FIG. 4 is a left half longitudinal sectional view showing a third embodiment of the roll die of the present invention.

FIG. 5 is a vertical sectional view of a conventional roll die for rolling a drum .

FIG. 6 is a longitudinal sectional view of a main part of the rope hoist.

FIG. 7 is a perspective view showing an overall configuration of a drum rolling machine.

FIG. 8 is a vertical cross-sectional view of a hoist drum in which rope grooves are rolled.

9 is a partially longitudinal front view of the rolling machine shown in FIG.

10 is a cross-sectional view taken along the line I-I of FIG. 9.

FIG. 11 is a front view of the drum shown in FIG.

FIG. 12 is an explanatory diagram of a force that acts on a roll die during drum rolling.

FIG. 13 is an explanatory diagram of stress concentration acting on the roll die during drum rolling.

[Explanation of symbols]

23A, 23B ... Rolling projection dividing member, 23A-1, 2A-2
3B-1 ... Protrusion for rolling, 25 ... Bolt.

Front page continuation (72) Inventor Kunio Kuronuma 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Co., Ltd. Taga factory (72) Inventor Shigeru Uemura 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Shares Hitachi, Ltd. Taga factory (56) References Japanese Patent Laid-Open No. 50-84455 (JP, A) Actual 59-194323 (JP, U)

Claims (4)

(57) [Claims] 1. A roll-dies drum rolling with a plurality of rolling projections, the plurality of rolling projections, de
The rolling projection dividing member is formed by dividing the dividing member at a position corresponding to the mountain portion of the rope groove formed on the outer periphery of the ram, and the dividing members are connected by mechanical connection such as bolt connection. Roll dies for drum rolling characterized by 2. A drum rolling roll die according to claim 1, wherein the plurality of rolling projection dividing members are fastened to the side surfaces by alternately inserting bolts on the left and right sides. 3. The drum rolling method according to claim 1, wherein a male screw is provided on a side surface of one rolling projection dividing member, and a female screw provided on a side surface of another rolling projection dividing member is fastened to the male screw. Roll dies. 4. A male thread is provided on a side surface of one rolling projection dividing member, and a side surface portion of another rolling projection dividing member is fitted to this male screw to form a male thread of the male thread. Roll die for drum rolling with a nut fastened to the tip.