JP2899355B2 - Roll structure of three-roll cold drawing machine - Google Patents

Description

The present invention relates to a cold drawing plant for producing several small product pipes having different outer diameters from a mother pipe having a single reference outer diameter by drawing. The present invention relates to a technique for adjusting three rolls in order to manufacture a product pipe having a beautiful surface skin quality and high dimensional accuracy of an outer diameter.

(B) Conventional technology Conventionally, the relative positional relationship between the three rolls and the roll shaft is fixed, and in the case of a large-diameter pipe, the assembly incorporating the three rolls and the roll shaft is mounted on a special roll lathe. By hanging, a predetermined hole size was obtained by cutting.

(C) Problems to be solved by the invention However, in the conventional case, it is necessary to always have a special roll lathe, and a special technical They needed to be maintained and costly.

Also, when drawing a small-diameter pipe, the diameter that can be processed by a roll lathe is too small to be possible, and even if the processing accuracy of each roll is increased and the assembly accuracy when assembling it is increased, It is difficult to obtain the accuracy of the combination of the two, and it has been difficult to achieve and maintain the desired accuracy of the roll-hole type.

According to the present invention, two of the three rolls can be adjusted in the roll axis interval, and further, the rolls are slid in the axial direction of the roll shaft, so that the center position of the mother pipe passage space constituting the drawing hole die is formed. It is possible to make the adjustment match.

(D) Means for Solving the Problems The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

The three roll shafts 4, 5, and 6 are arranged at an angle of 60 ° in the same plane, and each of the roll shafts 4, 5, and 6 has rolls 1, 2, and 3 and a bearing device that form a drawing hole type. And the power transmission bevel gear is inserted, and the roll 1 on one roll shaft 4 of the three roll shafts is driven by the drive motor M, so that position adjustment is impossible, and the other two roll shafts 5, The rolls 2 and 3 on the roller 6 are driven by a single roll shaft 4 via a bevel gear.
By eccentrically aligning the axis of the bearing with the axis of the bearing, and by rotating the roll shafts 5, 6, the positions of the rolls 2, 3 can be adjusted in a direction perpendicular to the axis of the roll shafts 5, 6, and A shaft slide mechanism is provided at the end of shafts 5 and 6, and roll shafts 5 and 6 for rolls 2 and 3 are provided.
The position can also be adjusted in the axial direction of.

(E) Embodiment The problems to be solved and means to be solved by the present invention are as described above. Next, the configuration of the embodiment shown in the attached drawings will be described.

1 is an overall perspective view of a three-roll type cold drawing machine, FIG. 2 is a perspective view showing a roll position of the three-roll type cold drawing machine, and FIG. 3 is a front sectional view of one set of cold drawing machines. 4 is a cross-sectional view taken along the line XX of FIG. 3 showing a mechanism for rotating the bearing portion of the roll shaft 5, FIG. 5 is a cross-sectional view of a mechanism for pulling the roll shaft 5 in the axial direction, and FIG. It is sectional drawing which shows a male mechanism with the axis | shaft 5 in the axis direction.

In FIG. 1, a plurality of roll housings H each having three rolls arranged therein are arranged in series, and a base pipe having a reference outer diameter sequentially passes through the inside of the roll housings H arranged in series, thereby gradually increasing the number of roll housings H. Then, cold drawing is performed.

In FIG. 1, eight roll housings H are arranged in series, but usually 8 to 24 roll housings H are arranged.
Are arranged in series to perform cold drawing.

One roll housing H is provided with one variable speed drive motor M, which drives the spindle shaft 19 from the motor shaft, and then drives the roll shaft 4 via the coupling 20.

In FIG. 2, the rolls 1, 2, 3 and the roll shafts 4, 5, 6 arranged inside the roll housing H are shown. The roll shafts 4, 5, 6 are arranged on the same plane,
The mother pipe having a slightly larger diameter passes through the mother pipe passage space A formed by the three rolls 1, 2, and 3.

Next, in FIG. 3, the drive system of the rolls 1, 2, and 3 will be described.

Inside the roll housing H, three roll shafts 4, 5, and 6 are supported in the same plane by three bearings.

A roll shaft 4 for pivotally supporting the roll 1 protrudes to the outside of the roll housing H.
The spindle shaft 19 is connected via the
Are directly driven by the drive motor M.

The roll shaft 4 has bearings 25 and 26 with respect to the roll housing H.
, And bevel gears 7, 8 are fixed to the center of the roll shaft 4 via a key 27. A roll 2 is attached to the boss 8a of the bevel gear 8 via a key 28.
Is fixed.

With this configuration, when the roll shaft 4 rotates, the roll 1 rotates, and simultaneously, the bevel gears 7, 8 rotate. The bevel gear 7
Is engaged with a bevel gear 9 loosely fitted on the roll shaft 5 via bearings 21 and 22, and the roll 2 is fixed via a key 29 on a boss 9 a of the bevel gear 9.

Therefore, the boss 9a and the roll 2 are rotated by the bearings 21 and 22 without rotating the roll shaft 5 itself.

The roll shaft 5 has the bearing portions 5a and 5b at both ends fitted in fitting holes 23a and 23b formed in the roll housing H, and the shaft core of the bearing portions 5a and 5b, The center of the central portion 5b in which the bearings 21 and 22 are inserted is eccentric by a distance t as shown in FIG.

Similarly, the roll shaft 6 on which the roll 3 is loosely fitted also has the bearing portions 6a, 6
The portion a is eccentric with respect to the axis of the central portion 6b by a distance t.

The bevel gear 10 on the roll shaft 6 meshes with the bevel gear 8 on the roll shaft 4, and the adjustment mechanism for the rolls 2 and 3 has the same configuration. Therefore, the adjustment mechanism for the roll 2 will be described.

FIG. 4 is a cross-sectional view taken along the line XX of FIG. 3, in which a notch 5c is provided in the bearing 5a of the roll shaft 5. The notch
The pivoting support pin 15 is loosely fitted to the portion 5c, and the pivoting support pin 15 has an adjusting bolt contact surface 15a.

As shown in FIG. 4, tips of the left and right adjustment bolts 16 and 17 screwed into the wall portion of the roll housing H are in contact with the left and right adjustment bolt contact surfaces 15a and 15a.

The adjusting bolts 16 and 17 are screwed with lock nuts 18 for locking at the adjusted positions.

The adjusting bolts 16 and 17 are formed by hexagonal bolts, and a hexagonal wrench is inserted into a hexagonal hole drilled at an end and rotated to enable a push-pull operation. As shown in FIG. 4, the adjusting bolts 16 and 17 are pushed and pulled from the left and right, and the roll shafts 5 and 6 are rotated to a certain angle via the rotating pivot pins 15.

As the pivot pin 15 rotates in the fitting holes 23a, 23b, the central portion 5b having a different axis from the center of the mother tube passage space A is adjusted to be far from the center of the mother tube passage space A by the distance t. It is done.

The roll shaft 6 and the roll 3 also adjust the distance of the roll 3 with respect to the center of the mother tube passage space A.

When the roll shafts 5 and 6 rotate, the pivoting pivot pin 15 is loosely fitted and pivots at this portion, so that the ends of the adjusting bolts 16 and 17 and the adjusting bolt of the pivoting pivot pin 15 are connected. For the time being, the relationship with the surface 15a is always in a right angle state.

Adjustment by the adjustment bolts 16 and 17 is performed in the mother pipe passage space A.
The configuration is such that the rolls 2 and 3 are adjusted to be far and near with respect to the center of the roll.

The slide adjusting mechanism includes a pull bolt 11 and a push bolt 12 provided at the ends of the roll shafts 5 and 6.

The roll shafts 5, 6 are not positioned in the axial direction with respect to the fitting holes 23a, 23b, and the pulling bolt 11 and the pushing bolt 12 perform the positioning.

That is, when the push bolt 12 is loosened and the pull bolt 11 is rotated in the screwing direction, the roll shafts 5 and 6 are pulled in the direction of the fixed body 13 so that the pull side can be adjusted. Conversely, pulling bolt 11 is loosened, and pulling bolt 11 is
By screwing in the direction of pushing out to the side, the inside of the roll shaft 5 is pushed in and adjusted.

By adjusting the pull bolt 11 and the push bolt 12, the rolls 2, 3 can be slid in the axial direction of the roll shafts 5, 6.

That is, the rolls 2 and 3 can be moved in the circumferential direction that is the left and right direction with respect to the axis of the mother pipe passage space A.

(F) Effects of the Invention The present invention is configured as described above, and has the following effects.

First, the relative position of the three rolls and the roll shaft is conventionally fixed, and in the case of a large diameter pipe, the assembly incorporating the three rolls and the roll shaft is set on a special roll lathe. In this case, a predetermined hole size is obtained by cutting.

However, in the conventional case, it is necessary to keep a special lathe or roll lathe at all times, and it is necessary to maintain a special skill capable of operating the lathe to obtain a die size. Was difficult to secure.

On the other hand, as in the present invention, the distance from the center of the mother pipe passage space A can be adjusted to be far or near by the adjusting bolts 16 and 17, and the roll shaft can be adjusted by the pulling bolt 11 and the pushing bolt 12.
By adjusting the rolls 2 and 3 in the directions of the axes 5 and 6, it is possible to obtain a perfect circular state of the desired outer diameter of the mother pipe passage space A without a skilled worker.

Secondly, when drawing small diameter pipes, the diameter that can be processed by a roll lathe is too small to be possible, and the processing accuracy for each roll is increased, and the assembly accuracy when assembling it is increased. However, it is difficult to obtain the accuracy of combining both,
It was difficult to achieve and maintain the desired roll-hole accuracy.

In the present invention, two of the three rolls can be adjusted with respect to the conventional technology, and the roll shaft interval can be adjusted. Further, the rolls are slid in the axial direction of the roll shaft to form a drawing hole type. The center position can be adjusted and matched, whereby the surface of the cold drawn product pipe is beautiful and a product pipe with high drawing accuracy can be provided.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a three-roll type cold drawing machine, FIG. 2 is a perspective view showing a roll position of the three-roll type cold drawing machine, and FIG.
FIG. 4 is a front sectional view of a pair of cold drawing machines, FIG. 4 is a sectional view taken along the line XX of FIG.
FIG. 5 is a sectional view of a mechanism for pulling the roll shaft 5 in the axial direction, and FIG. 6 is a sectional view showing a male mechanism in the roll axis 5 in the axial direction. A: Mother pipe passage space 1, 2, 3 ... Roll 4, 5, 6 ... Roll shaft 8, 9, 10 ... Bevel gear 11 ... Pull bolt 12 ... Push bolt 15 ... Rotating pivot pin 16,17 …… Adjustment bolt

Claims (1)

(57) [Claims] 1. Three roll shafts 4, 5, 6 are arranged at an angle of 60 ° with respect to each other in the same plane, and each of the roll shafts 4, 5, 6 is provided with a roll 1, 2, , 3 and the bearing device and the power transmission bevel gear are inserted, and the roll 1 on one roll shaft 4 of the three roll shafts is driven by the drive motor M, so that the position adjustment is impossible, and the other two Roll 2,3 on roll axis 5,6 of
In a configuration in which a single roll shaft 4 is driven via a bevel gear, a bearing shaft supporting the roll shafts 5 and 6 and a bearing shaft supporting the rolls 2 and 3 are eccentrically arranged. By rotating the roll shafts 5, 6, the positions of the rolls 2, 3 can be adjusted in a direction perpendicular to the axis of the roll shafts 5, 6, and a shaft slide mechanism is provided at the end of the roll shafts 5, 6. , Roll 2,3
The roll structure of a three-roll type cold drawing machine characterized in that the position of the roll shafts 5 and 6 can also be adjusted in the axial direction.