Super-thick rectangular flat steel hole pattern

Abstract

The utility model discloses an ultra-thick rectangular flat steel pass, the groove bottom compensation of the pass is valued according to the middle and lower limits of design specifications, the groove bottom compensation f of the pass is (0.2-0.5) b, b is the reduction of the next pass, the inclination alpha of the side wall is 8-12 degrees, the width B of the groove bottom is b-(0-1) mm, b is the thickness of an incoming material, the arc radius Rt of four corners is r + (0.3-0.6) bmm, and r is the corner size of a finished product. The shape precision of the rectangular flat steel is improved, torsion and scrap are reduced, the product yield is improved, the product benefit is increased, and the cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of blast furnace ironmaking technology, specifically relating to an ultra-thick rectangular flat steel hole type. Background Technology

[0002] Air suspension systems are advanced products popular in the automotive industry. In some countries, 100% of medium and large buses use air suspension systems, and more than 40% of trucks, trailers, and tractors use them. In some special vehicles (such as instrument vehicles, ambulances, special military vehicles, and container transport vehicles with high shock absorption requirements), air suspension is almost the only option. As a major component of air suspension, the guide arm's main function is to bear the vertical, longitudinal, and lateral reaction forces exerted on the wheels by the road surface; allowing the wheels to bounce relative to the frame and body along a certain trajectory, while also guiding the axle.

[0003] The guide arm is made of ultra-thick rectangular flat steel. Due to its special shape and size, it is difficult to produce using a two-roll short stress rolling mill. The product quality is extremely unstable due to the influence of process and tooling conditions. There are many scraps such as desquared and twisted scrap. It is necessary to optimize the process of the die to stabilize the product shape and quality. Utility Model Content

[0004] This invention provides a hole pattern for ultra-thick rectangular flat steel, which can solve the problems of unstable shape, de-squareness, and torsion of ultra-thick rectangular flat steel.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hole pattern for ultra-thick rectangular flat steel, wherein the groove bottom compensation of the hole pattern is taken according to the lower limit of the design specification, and the groove bottom compensation f = (0.2-0.5).

[0006] △b, △b is the amount of reduction in the next pass, the side wall slope α = 8-12°, the bottom width of the groove B = b - (0~1) mm, b is the thickness of the incoming material, the radius of the four corner arcs Rt = r + (0.3~0.6)△b mm, and r is the corner size of the finished product.

[0007] Compared with the prior art, the beneficial effects of this utility model are:

[0008] A newly designed die for ultra-thick rectangular flat steel still utilizes a widely used flat-vertical die system in flat steel production. Compared with other die types, it offers the following advantages: simple die shape, simplifying design; convenient adjustment, and easy control of rolled product dimensions; since it is rectangular flat steel, box-shaped die rolling is selected based on the product's cross-sectional shape to ensure that the rolled product's dimensions meet requirements; a smaller side slope improves die biting conditions, reduces rework, and increases die versatility; the groove bottom width is designed to be 0-1mm smaller than the incoming material, increasing die holding force and stabilizing the material shape; the groove bottom compensation is designed as f=(0.2-0.5)△b, ensuring the straightness of the product's side surface, stabilizing the rolled material shape, and thus improving the overall product quality. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the ultra-thick rectangular flat steel hole type of this utility model. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0011] Please see Figure 1 This embodiment provides a die pattern for ultra-thick rectangular flat steel. Taking the 62x70 specification as an example, the 62x70mm specification has a small width-to-height ratio and is a rectangular flat steel, so the finished product cannot be produced using a diamond-shaped die. Therefore, a box-shaped die system is used for production. To ensure that the dimensions of the rolled product meet the requirements, the design of the vertical rolling die for passes K2, K5, and K7 is particularly critical. The die design must simultaneously consider the control of the straightness of the sides and the radius of the four corners. It must also consider the bottom compensation of the groove and the reduction amount to control the concavity and convexity of the sides. At the same time, to reduce the difficulty of controlling the torsion and squareness, a smaller side slope is required. The straightness of the flat steel sides is controlled by designing a suitable groove bottom width and convexity, and the corner radius is designed to control the corner dimensions of the finished product. According to the die design principles, the groove bottom compensation of the die is taken according to the lower limit of the design specification. The groove bottom compensation of the die is f = (0.2-0.5).

[0012] △b, △b is the amount of reduction in the next pass, the side wall slope α = 8-12°, the bottom width of the groove B = b - (0-1) mm, b is the thickness of the incoming material, the radius of the four corner arcs Rt = r + (0.3-0.6)△b mm, r is the corner size of the finished product, Bk in the figure is the groove width of the hole type, and s is the width of the roller gap.

[0013] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hole type for ultra-thick rectangular flat steel, characterized in that: The groove bottom compensation of the hole type is taken according to the lower limit of the design specification. The groove bottom compensation of the hole type is f = (0.2-0.5)△b, where △b is the amount of pressure in the next pass, the side wall slope α = 8-12°, the groove bottom width B = b - (0~1) mm, where b is the thickness of the incoming material, and the radius of the four corner arcs Rt = r + (0.3~0.6)△b mm, where r is the corner size of the finished product.

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