A method of sizing a hole

Abstract

This invention discloses a method for matching rolls in the cutting hole field, belonging to the technical field of section steel rolling. It solves the technical problem that the upper and lower rolls are damaged due to collisions between the cutting edges during high-speed rotation. The method involves setting a first roll matching gap smaller than the cutting edge gap at both ends of the upper and lower rolls, and determining the diameters of both ends of the upper and lower rolls based on the first roll matching gap. The first roll matching gap is 0.5-2mm smaller than the cutting edge gap. When the upper or lower roll shifts during high-speed rotation, because the first roll matching gap is smaller than the cutting edge gap, the first roll matching gap of the upper and lower rolls will contact each other first, preventing collisions between the cutting edges and avoiding abnormal damage to critical positions such as the cutting edges.

Description

Technical Field

[0001] This invention relates to the field of steel section rolling technology, and more specifically, to a method for matching rolls for slitting holes. Background Technology

[0002] In the steel section rolling process, as shown in the attached... Figure 1 As shown, the annular grooves cut on the rolls to process the workpiece are called grooves A. A roll ring B is left between two adjacent grooves A. The openings formed on the rolling surface by the two grooves A of the upper roll C and the lower roll D are called the pass E. The gap formed by the two roll rings B is called the roll gap F. The arrangement of the pass and the roll gap on the rolls is called roll matching.

[0003] Existing roll matching methods typically set the same roll gap value at both ends and in the middle of a set of rolls. This allows for adjustments when encountering special die shapes, such as split holes. Figure 2 The roll gap F value will be equal to or even less than the gap of the cutting edge G, that is, the cutting edge G on the groove A is higher than the roll ring B. The defects are mainly manifested as follows:

[0004] In the slitting rolling process, the roll gap is already relatively small, and the gap between the slitting blades is even smaller. When the roll shifts due to a defect in the positioning bearing during the rolling process, the upper and lower rolls, which are rotating at high speed, will be damaged by the collision between the slitting blades of the shifted rolls. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a method for matching rollers for the cutting hole, which can avoid abnormal damage to key positions of the cutting edge and other hole shapes.

[0006] The technical solution of the present invention is: a method for matching rollers for a cutting hole, wherein a first roller matching gap smaller than the cutting blade gap is respectively set at both ends of the upper roller and the lower roller, and the diameters at both ends of the upper roller and the lower roller are determined according to the first roller matching gap.

[0007] As a further improvement, the first roller gap is 0.5-2 mm smaller than the cutting blade gap.

[0008] Furthermore, the first roller gap is formed by connecting at least two different widths of gaps in sequence.

[0009] Furthermore, while meeting the normal die design requirements, at least one second roll gap smaller than the cutting blade gap is provided in the middle of the upper and lower rolls, and the diameter of the upper and lower rolls located at the second roll gap is determined according to the second roll gap.

[0010] Furthermore, the second roller gap is 0.5-2 mm smaller than the cutting blade gap.

[0011] Furthermore, the second roller gap is formed by connecting at least two different widths of gaps in sequence.

[0012] Furthermore, when preparing the rolling program, the specific values ​​of the first or second roll gap at different positions of the upper and lower rolls must be noted to better guide production operations.

[0013] Beneficial effects

[0014] Compared with the prior art, the advantages of this invention are as follows:

[0015] In this invention, when the upper or lower roller shifts during high-speed rotation, the first roller gap is smaller than the cutting edge gap, so the first roller gap of the upper and lower rollers will contact each other first, so that the cutting edges of the upper and lower rollers will not collide, thus avoiding abnormal damage to the cutting edge and other key positions of the hole. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the upper and lower rollers in the prior art;

[0017] Figure 2 This is a schematic diagram of the cutting blades of the upper and lower rollers in the prior art;

[0018] Figure 3 This is a schematic diagram of the structure of the first roller gap in this invention;

[0019] Figure 4 for Figure 3 Enlarged view of point P in the middle;

[0020] Figure 5 This is a schematic diagram of the structure of the second roller gap in this invention.

[0021] Wherein: 1-upper roll, 2-lower roll, 3-pass shape, 4-cutting blade, A-roll groove, B-roll ring, C-upper roll, D-lower roll, E-pass shape, F-roll gap, G-cutting blade, H-cutting blade gap, K-roll gap, M-first matching roll gap, N-second matching roll gap. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0023] See Figures 3-5 A method for matching rollers for a cutting hole involves setting a first roller gap M, smaller than the cutting edge gap H, at both ends of an upper roller 1 and a lower roller 2. The cutting edge gap H is the gap between the two cutting edges 4 of the upper roller 1 and the lower roller 2. The diameters at both ends of the upper roller 1 and the lower roller 2 are determined based on the first roller gap M. The gap between the first roller gap M and the hole type 3 is a roller gap K, which is larger than the cutting edge gap H.

[0024] When the upper roller 1 or lower roller 2 moves during high-speed rotation, the first roller gap M is smaller than the cutting blade gap H, so the first roller gap M of the upper roller 1 and lower roller 2 will contact each other first, so that the cutting blades 4 of the upper roller 1 and lower roller 2 will not collide, thus avoiding abnormal damage to the key position of the cutting blade hole.

[0025] In this embodiment, the first roller gap M is 0.5-2mm smaller than the cutting blade gap H. The value of the first roller gap M is determined according to the actual situation. When the cutting blade gap H is too small, the value is taken from the lower limit. When the cutting blade gap H is too large, the value is taken from the upper limit.

[0026] Specifically, the length L of the first roll gap M can be determined based on the length of the roll body without the perforations at both ends. Furthermore, when the length L of the first roll gap M is large, such as L reaching 50mm, the first roll gap M can be formed by sequentially connecting at least two different widths of gaps, such as... Figure 4 As shown, the first roll gap M is composed of gaps M1, M2, and M3, which decrease sequentially. Of course, gaps M1, M2, and M3 can also increase sequentially, or be larger at both ends and smaller in the middle, or smaller at both ends and larger in the middle. All gaps M1, M2, and M3 are 0.5-2mm smaller than the cutting blade gap H, which can reduce the processing difficulty of the roll at the first roll gap M (the larger the gap, the lower the processing difficulty) and facilitate assembly.

[0027] When the length of the upper roller 1 and lower roller 2 is large (e.g., reaching 500mm), while meeting the normal die design requirements, at least one second roller gap N smaller than the cutting edge gap H is set in the middle of the upper roller 1 and lower roller 2. The second roller gap N is generally set at the roller ring, such as... Figure 5 As shown, the gap between the second roll gap N and the die 3 is the roll gap K, which is larger than the cutting edge clearance H. The diameters of the upper roller 1 and the lower roller 2 at the second roll gap N are determined based on the second roll gap N. Setting the second roll gap N can prevent abnormal damage to the critical position of the cutting edge die in the middle of the upper roller 1 and the lower roller 2.

[0028] The second roll gap N is 0.5-2mm smaller than the cutting blade gap H. Similar to the first roll gap M, when the length L of the second roll gap N is large, the second roll gap N is formed by connecting gaps of at least two different widths in sequence.

[0029] When preparing the rolling program, the specific values ​​of the first roll gap M or the second roll gap N at different positions of the upper roll 1 and the lower roll 2 must be specified to better guide the production operation.

[0030] This method uses the cutting hole as an example to illustrate its main function. If needed, other hole types can also refer to this method for roller matching.

[0031] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for matching rollers in a cutting hole, characterized in that, A first roller gap (M) smaller than the cutting blade gap (H) is set at both ends of the upper roller (1) and the lower roller (2), and the diameters of both ends of the upper roller (1) and the lower roller (2) are determined according to the first roller gap (M); The first roller gap (M) and the die (3) are separated by a roller gap (K), which is larger than the cutting blade gap (H). The first roller gap (M) is 0.5-2 mm smaller than the cutting blade gap (H); The first roller gap (M) is formed by connecting at least two different widths of gaps in sequence; Under the condition of meeting the normal die type (3) design requirements, at least one second roller gap (N) smaller than the cutting blade gap (H) is set in the middle of the upper roller (1) and the lower roller (2), and the diameter of the upper roller (1) and the lower roller (2) located at the second roller gap (N) is determined according to the second roller gap (N); The second roller gap (N) is 0.5-2 mm smaller than the cutting blade gap (H); The second roller gap (N) is formed by connecting at least two gaps of different widths in sequence.

2. The method for matching rollers for a cutting hole according to claim 1, characterized in that, When preparing the rolling program, the specific values ​​of the first roll gap (M) or the second roll gap (N) at different positions of the upper roll (1) and the lower roll (2) must be specified to better guide the production operation.

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