US3688541A

US3688541A - Stripper guide

Info

Publication number: US3688541A
Application number: US82046A
Authority: US
Inventors: Hiroyuki Ohkubo; Shigeo Saotome
Original assignee: Daido Steel Co Ltd; IHI Corp
Current assignee: Daido Steel Co Ltd; IHI Corp
Priority date: 1969-10-20
Filing date: 1970-10-19
Publication date: 1972-09-05
Anticipated expiration: 1989-09-05
Also published as: FR2066247A5; GB1278008A; DE2051217A1

Abstract

A stripper guide with a plate spring of suitable elasticity is located at the exit of a planetary mill. The leading edge of the plate spring extends beyond the envelope of the planetary roll so that the leading edge of the strip may be accurately guided by the deflection of the plate spring.

Description

0 United States Patent 11 1 3,688,541

Ohkubo et al. Sept. 5, 1972 I54] STRIPPER GUIDE [72] lnventon: Hlroyuki Ohkubo; Shigeo Seotome, [561 W cm both of Yokohama Japan UNITED STATES PATENTS I s GhihnllIM-lhrima J m 1,056,030 3/1913 Killion ..72/172 Knbmhfil Knish, y Daldo 1,675,820 7/1928 Pisarcik ..72/250 Sdlw M K81!!! Nagoyo- 499,259 6/1893 Sheldon ..72l428 X shi, Japan Primary Examiner-Milton S. Mehr [22] Filed. Oct. 19, 1970 Atmmey Nlte & None 21 App]. No.: 82,046

[57] ABSTRACT [30] Foreign Application Priority Data A stripper guide with a plate spring of suitable elasticity is located at the exit of a planetary mill. The leading Oct. 20, 1969 Japan ..44/s3701 edge of the plate spa-"g extends beyond the envelope of the planetary roll so that the leading edge of the Ls. a t 1 t 1 I 1 u 1 i 1 t I 1 u v v u 1 t I I v m [51] Int. Cl. .132") 39/20 plate spn-ng [58] Field at Search ..72/250, 227, 428, l72, l9l,

72/194 7 Claims, 7 Drawing Figures PKTENTED E 5 I97? SIiEUIllFZ PATENTEB E 5 I912 SHEETZIIFZ INVENTORS O I OHKUBO ATTORNEYS STRIPPER GUIDE BACKGROUND OF THE INVENTION The leading edge of strip leaving a planetary rolling mill must be guided to prevent it curving to follow the work rolls of the mill.

To achieve this end, in the prior art, a rigid guide plate has been located with its leading edge as close as possible to the path of the work rolls and near to the exit from the path mill, i.e., the plate is located as close as possible to the external cylindrical envelope. Even when the lead edge of the guide plates is located as closely as possible to the path of the working rolls there is a tendency for the lead edge of the strip to enter the space between adjacent ones of the working rolls to interrupt the rolling mill operation.

An alternative prior art arrangement to solve this problem has been the provision of a rotating strip guide which rotates in the opposite direction to the planetary mill and has teeth directed towards the exit from the mill to catch the leading edge of strip issuing from the mill and divert it from the work rolls. A major problem with this type of guide is that the leading edge of the strip tends to be bent over or hooked as it is sprung back by the teeth of the rotary guide.

Additionally, the guide must be spaced from the external envelope of the planetary rolls by a distance not less than 0.2 to 0.5 mm so that the guide does not interfere with the movement of the mill. Even with this minimum spacing there is a tendency for the leading edge of the strip issuing from the mill to pass between the guides and the planetary rolls so that the rolling operation is interrupted.

The present invention seeks to overcome the disadvantages of the prior art guides described above.

The present invention is further described with reference to the accompanying drawings.

FIGS. 1 and 2 are diagrammatic views for explanation of the prior art shipper guides as already described above.

FIG. 3 is a graph illustrating the relation between the forward displacement of the leading edge of the strip and the angular position of the work roll.

FIG. 4 is a perspective view of a planetary mill incorporating a stripper guide in accordance with the present invention for explanation of the working rolls;

FIG. 5 is a schematic view illustrating a first embodiment of a stripper guide of the present invention;

FIG. 6 is a diagram for explanation of the leading edge of the strip being guided by the stripper guide of the present invention; and

FIG. 7 is a schematic view illustrating a second embodiment of the present invention.

In the prior art stripper guide for guiding the strip rolled by the planetary mill from its exit, the leading edges of guides are generally located close to the external cylindrical envelopes of the planetary rolls b as shown in FIG. 1, Le, located close to the path of the work rolls e.

In the prior art fixed-type stripper guide, even when the space between the leading edges of the guides a and the envelopes c of the planetary rolls 1: is reduced to the minimum, the leading edge of the strip d which is bent as shown in FIG. 1 tends to enter into the space between the adjacent work rolls e because of the rotation at high speed of the planetary roll, thus causing the failure of the rolling operation.

To overcome this problem, the prior art has proposed a stripper guide system as shown in FIG. 2. The stripper guide system is provided with rotary stripper guides f having teeth moving so that the leading edge of the rolled strip may be guided by the teeth of the rotary stripper guides f.

The leading edge of the strip d entering into the space between the rotary stripper guide f rotating at high speed and a planetary roll b may be redirected by the rotary stripper guide f toward the correct path. However, there arises a problem of bending of the leading edge of the strip as shown in FIG. 2 because the leading edge is sprung back by the teeth of the rotary guide f.

In the prior art guides of the type described, the leading edge of the guide must be spaced apart from the planetary roll by a distance at least longer than 0.2 to 0.5 mm so that breakdown due to the contact or collision of the guide with the work rolls may be prevented. However, even when the spacing between them is reduced to the minimum, the leading edge of the thin strip at still tends to pass below the guides so that the rolling operation becomes extremely difficult and sometimes becomes impossible.

Referring to FIGS. 4 and 5, a planetary roll generally designated by 1 and consisting of a plurality of work rolls 2, 2' and so on mounted inside cages 3 is supported by a pair of chucks 4. A main body 5 of a stripper guide is securely fixed to the chocks 4 in such a manner that the leading edge of the main body 5 may be spaced apart from the envelope 8 of the planetary roll 1. A plate spring 6 is securely fixed upon the main body 5 by a spring retainer 7 in such a manner that the leading edge of the plate spring 6 extends beyond the envelope 8 into the space between the adjacent work rolls 2 and 2'. In consequence, the plate spring 6 is caused to spring back successively by the reversely spinning work rolls so that the plate spring 6 is bent upwardly, whereby the leading edge of the strip 9 is guided accurately toward the upper surface of the main body 5.

Because of the construction of the stripper guide described above, even when the leading edge of the strip 9 is bent downwardly by the high speed rotation of the planetary roll I and is directed toward the space between the work rolls, the strip 9 is prevented from entering into the space by the plate spring 6 and is guided toward the upper surface of the main body 5.

According to FIG. 5, the leading edge of the plate spring 6 is pressed against the spinning work rolls successively with a predetermined pressure and is caused to spring back so that the leading edge of the strip 9 may be guided toward the upper surface of the main body 5.

For an actual planetary rolling mill, the relation between the forward displacement of the leading edge of the strip and the angular position of the work roll is illustrated in FIG. 3. FIG. 6, as already indicated, shows the actual positions of the parts.

According to the present invention, the leading edge of the plate spring 6 always extends beyond the envelope of the planetary roll, where it encounters the strip, unless the leading edge of the strip 9 be extremely bent so that it may advance along the undersurface of the plate spring 6. Therefore, the accurate guidance of even a thin strip is ensured.

The second embodiment of the present invention is schematically illustrated in FIG. 7. At the leading edge of the plate spring 6 is fixed a resilient bridge plate 10 in such a manner that the bridge plate 10 coasting with the plate spring 6 may completely block the space between the adjacent work rolls 2 and 2' or bridge the adjacent work rolls 2 and 2'. In consequence, the leading edge of the strip 9 is prevented from entering the space between the adjacent work rolls 2 and 2' and is positively guided toward the upper surface of the main body 5 of the stripper guide.

The second embodiment has the advantage that the leading edge of the strip may be more positively prevented from entering the space between the adjacent work rolls.

Although the present invention has been described as being applied to the lower planetary roll, it is understood that the stripper guides of the present invention may be applied to both of the upper and lower planetary rolls of the planetary mill. it is also understood that the present invention is not limited to the embodiments described above.

From the foregoing description, it is seen that the present invention does not employ the rigid construction of the prior art stripper guide. According to the present invention, the leading edge of the plate spring is extended beyond the envelope of the planetary roll so that the leading edge of the strip may be accurately guided by the deflection of the plate spring. Therefore, the leading edge of the strip now can be positively prevented from entering into the space between the guide and the planetary roll, which cannot be attained by the prior art stripper guide. Even a thin strip is positively and accurately guided and the leading edge of the strip will not be bent. Because of the elasticity and flexibility of the plate spring, no surface flaw is caused upon the surfaces of the work rolls which spin at high speed. This is in contrast to the rigid construction of the prior art stripper guide. Furthermore, less noise and vibrations are produced.

What is Claimed is:

1. A planetary rolling mill having a plurality of rolls orbiting about a common center comprising a guide means for strip issuing from the mill said guide means having a guide support body positioned at the exit from the mill and outside the path of movement of the rolls of the mill and a resilient guide element secured to said body and extending from it slightly into the path of movement of the rolls of the mill to contact successive ones of the rolls passing the resilient guide element thus to deflect the leading edge of strip issuing from the mill on to the guide support body.

2. A rolling mill as claimed in claim 1 wherein said guide element comprises a plate spring.

3. The rolling mill as claimed in claim 1 comprising a bridging element secured to the resilient guide element to bridge the space between adjacent works rolls passing said guide element.

4. The rolling mill as claimed in claim 2 comprising a bridging element secured to the resilient guide element to bridge the space between adjacent work rolls passing said guide element.

5. in a planetary mill of the type having a planetary roll including a plurality of work rolls orbiting about a common cente and d nin an envelo of movement, and a stripper gui e m unted at m 'im side of said mill for guiding strip materials passing through said mill, the improvement wherein said stripper guide is comprised of a resilient plate mounted with a leading edge thereof extending into the envelope of movement of said work rolls and positioned to be successively deflected by said work rolls upon rotation of said planetary roll, whereby said leading edge is forced out of said envelope by each work roll and springs back into said envelope between adjacent work rolls as the planetary roll rotates.

6. The planetary mill of claim 5 wherein said resilient plate comprises a plate spring, and said stripper guide further comprises a second plate spring mounted on said leading edge for successively contacting said work rolls.

7. The planetary mill of claim 5 wherein said second plate spring is of a width to form a bridge between adjacent work rolls.

I It i i

Claims

5. In a planetary mill of the type having a planetary roll including a plurality of work rolls orbiting about a common center and defining an envelope of movement, and a stripper guide mounted at the exit side of said mill for guiding strip materials passing through said mill, the improvement wherein said stripper guide is comprised of a resilient plate mounted with a leading edge thereof extending into the envelope of movement of said work rolls and positioned to be successively deflected by said work rolls upon rotation of said planetary roll, whereby said leading edge is forced out of said envelope by each work roll and springs back into said envelope between adjacent work rolls as the planetary roll rotates.