JPH0243343A - Corner parts for manganese steel containers - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a manganese steel container corner member having joint holes on three outer surfaces.

[Conventional technology]

When transporting small packages, large packages, liquids, etc., please use the dimensions (approximately 3
-12 m) and load capacities (10, 20, 24, and 30 MP) according to the ISO (International Standards Organization) classification.

Corner members are attached to eight corners of the container to facilitate horizontal or vertical connection of the containers to each other or to a vehicle.

The corner members can be joined using vertical and horizontal holders made of rolled plate or profiled parts. In addition to being movable, lifting, and fastening, it is important that containers can be stacked on top of each other.

Traditionally, container manufacturers cast steel and weld the finished castings to vertical and horizontal holders, usually by hand or by rudimentary mechanized operations. . It is difficult to completely inspect the welded area, and it cannot be said to be absolutely safe. Among the possible damage to containers, in addition to the destruction of corner members,
Split or broken seams due to incomplete welds occur very frequently. When repairing this, for example, when replacing a broken corner member, it is difficult to match the dimensions to Todoroki's original or to provide the required clearance, which requires a great deal of time and effort. It is. Moreover, a defective container cannot be used for a long period of time.

“Cargo Systems”
In the October 1985 issue of the scientific journal J, Hewitt, P.
) research institute, and the Trade Association Sheffield Ltd.
Sea Container Co., Ltd. (SeaContainer) regarding casting corner materials was carried out jointly with
s) is reported. The study included measurements and tests on cast corners manufactured around the world. The results regarding Charpy impact energy at low temperature are shown in the table below.

A4. O.J.
-40B 7.5J
-40CI4.5J
'-40D 10.5J
Materials suitable for the manufacture of -40 corner parts must meet the specifications ISO 1496/1 or LR1984 and are prepared using the Charpy method at -40°C in a so-called v-gap. The required values are as follows.

Regarding 10 x 10m1 test rod 34J or more 10X 7.5mn test rod 28J or more 1
It is clear that the requirements shown in the table above for 0X 5++WI+ test bars above 23J cannot be met by any manufacturer. Therefore, one of the drawbacks of cast members produced according to current state of the art knowledge is that their impact energy values at low temperatures are unsatisfactory.

A British company called Blair has recently developed a corner member whose minimum impact energy KVmzn at -50° C. can reach 21 J after just one normalizing heat treatment. However, it is not at low temperatures that most corner failures occur. In fact, major railway companies (e.g. 08 in West Germany, 5NCF in France)
According to data provided by companies such as BR Ltd. and BR Ltd. in the UK, damage to corner members or splitting of joints in their holders can occur not only when changing or aligning freight cars, but also due to rough handling or loading/unloading. It occurs in a temperature range of 0°C or higher.

Due to the raw material composition of the cast steel and the extra dynamic stress resulting from rough handling, the mechanical properties of the corner members are lower than 0°C.
It becomes even worse in the following temperature ranges. All such consequences in cracking and breaking limit the usefulness of the container.

According to tests carried out by the German company Die Bundesbahn (DB), the deceleration force measured during braking was 4 g/m/
A value of 5ee2 was reached, or in fact exceeded, which is more than twice the rated value. Therefore, Company 08 has set the specifications for all the containers it purchases to be higher than this.

From the above results, corner members used in containers must be manufactured under strict quality control and rigorously tested.

The disadvantages of conventional cast steel corner members are as follows.

(1) Steel casting technology requires special skills, techniques, and raw materials, and is also expensive and consumes a lot of energy.

(2) Surface defects (for example, shrinkage, inclusions, cracks, etc.) in the casting are exposed only during the processing of the corner member. Proper repair of such defects is complex and difficult as it requires preheating operations, special welding electrodes, and repeated heat treatments.

Things get even more complicated when defects are found in the finished product.

(3) In order to achieve the specified structural and mechanical qualities, heat treatments are required, which necessarily involve significant energy consumption.

(4) It is necessary to process at least three sides of the cast corner member, and in reality, from the relationship of the base surface, six
All surfaces are subject to processing.

(5) Due to the casting technique, the corner members become excessively heavy.

(6) The eight corner members required for each container can only be manufactured using four types of prototypes that are separately molded and cast.

From the above, it can be seen that it is not easy to manufacture corner members according to specifications.

[Problem to be solved by the invention]

The object of the present invention is to provide a corner member of the following new form, which eliminates the disadvantages of known methods.

(1) Suitable for continuous manufacturing in terms of materials, structure, and technology.

(2) Energy consumption is economical, and repeated heat treatments are unnecessary.

(3) Suitable for stacking.

(4) Impact energy at low temperatures meets standards.

[Means to solve the problem]

The present invention meets all of the requirements listed in item 2, including a manganese to carbon ratio of 8 to 12, a total phosphorus and sulfur content of up to 0.04 wt2, and a carbon content of up to 0.04 wt. This is based on the knowledge that this can be realized if the corner members are manufactured using a steel plate with a weight of 2.

The steel plate with the above composition is homogeneous as a material and has a flexible edge (
Rmin"a/2Wl, where a means the thickness of the plate), and the impact energy value at -40°C (K
Vmzn) reaches 21J. The wall thickness of a corner member manufactured using such a material is thinner than when a casting is used. Therefore, it is desirable to arrange a spacer inside the joint hole, thereby ensuring a secure connection with the conventional element.

The steel plate used as the basic material of the corner member according to the invention has a homogeneous grain structure even in the direction perpendicular to the rolling direction and is suitable for the application of cold working techniques. Its elongation value (A5) is more than 22% and the edges are very flexible.

The size and extent of tolerances for corner members manufactured using such materials must comply with the most stringent specifications (e.g. ISO 11
61). The weight of this corner member is at least 10% less than the weight of the cast steel control product, and the variation is 2% less than the rated value.

In most cases, no remachining is required and replacement within the container can be done quickly and easily. Each stage of manufacturing can be highly mechanized, so that robotization can also be applied, making it possible to increase the precision and reproducibility of the product.

The manufacture of the corner parts can be carried out on the basis of simpler and less energy consuming cold working techniques. Cut (pressed) steel plates are bent and assembled at low temperatures. The welding of the parts can be carried out in a planar manner using a robot by means of simple geometric tracing. Since the root of the weld is fixed, highly accurate and reproducible welding can be performed. The finished product is beyond that.”
It does not require any heat treatment of the second one, and the technology for its replacement is also much simpler.

Two methods of assembling the corner member according to the present invention are shown in FIGS. 1 to 6. In the case of the second style, 6 of the corner member
The side surface of the corner member according to the first mode is formed by three edges and two three-sided shell elements converging on one common vertex, while the side surface of the corner member according to the first mode is They meet at the edges of the book, so such elements are U-shaped.

〔Example〕

Hereinafter, the present invention will be described based on preferred embodiments with reference to the accompanying drawings.

The corner members placed on the second and bottom sides of the container are
The only difference is the size of the hole on its shorter side. Therefore, shell niremen 1 to (A) are manufactured to have two different holes. (B), the upper and lower rows are identical and match (A
) to form a corner member.

The slightly modified shell element (A) can be considered as a finished product, since it can be used as a corner part of a tank container.

The dimensions and tolerances of the corner members shown in FIGS. 1-6 comply with the 1984 ISO 1161 specification.

Therefore, it is as follows.

Length: 1 = 178 ± 1 Width: w = 162 ± 1 m Height: h = 118 ± 1 mm Weight 79.60 - 9.75 kg ± 2% (depending on assembly style) Corner members are interchangeable, and , for repair purposes, it can be manufactured with varying dimensions in increments of -.

According to the first embodiment, a shell element (
A) and a shell element (B) made of a steel plate with a thickness of 8 mm and having an L-shaped cross section with an inner bending radius RII,i equal to a/2 mn constitute a corner member.

Drill a suitable hole in (A), but leave no hole in (B).

Shell elements (A) in the row below the corner members include (c
i) Spacers (cz) and (C4) are seated inside the holes, their positions determined using a guide gauge.

Shell elements (A) in the row above the corner members include (C
2) Attach spacers labeled (C3) and (C4).

By determining the size of the hole in the shell element (A), it is determined whether the corner member is attached to the top or bottom of the container. Mirror image shell elements can be created by reversing the direction of bending or by reversing the steel plate.

Assemble the above spare parts in the guide gauge, check the size, and then secure with tack welds. The next operation is to perform one fillet weld in succession.

The final step is to slope the outside of the hole to inlet 1 (
6x45°) work.

Once the corner members are finished, their surfaces are cleaned.

The second embodiment is also based on the concept of creating a corner piece using two shell elements and three spacers. Holes are drilled on each side of the shell element (A). This hole is cut out from the unfolded board before it is bent. Do not drill holes in the shell element (B). The two shell elements are assembled in the same manner as described in the first embodiment to form a corner member.

[Brief explanation of the drawing]

FIG. 1 is a side view and a plan view of a corner member according to a second embodiment of the present invention, and a sectional view taken along the line D-E. FIG. 2 is a diagram showing a prototype of a shell element (A) according to a second embodiment of the present invention. FIG. 3 is a diagram showing a prototype of a shell element (B) according to a second embodiment of the present invention. FIG. 4 is a diagram showing a shell element (A) and a shell element (B) according to a second embodiment of the present invention together with a spacer. FIG. 5 is a diagram showing spacers (C type), (C2), (C3), and (C4) according to the second embodiment of the present invention. FIG. 6 is a diagram showing a corner member assembled using a shell element (A), a shell element (B), and a spacer according to the first embodiment of the present invention. FIG. 7 is an exploded view of a corner member according to a second embodiment of the present invention, in which (A) and (B) show two shell elements, (C3), (C2) and ( C4) indicates a spacer, and h indicates a bending baseline. (A) Shell element (B) Shell element (C) (C2) (C3) (C4) Spacer (D
) Starting point of the cutting line (E) Ending point of the cutting line Fig, 4

Claims (4)

[Claims] (1) Manufactured using a steel sheet with a manganese to carbon ratio of 8 to 12, a total phosphorus and sulfur content of up to 0.04% by weight, and a carbon content of up to 0.2% by weight; A manganese steel container corner member with a joint hole on the outer side. (2) Shell elements (A and B) manufactured by cold rolling steel plates and distance insert materials (C_1, C
_2, C_3, C_4) are assembled by welding. (3) The corner member for a container according to claim (2), characterized in that a shell element manufactured by bending or pressing is used. (4) Shell element manufactured using an automatic welding machine,
The corner member for a container according to claim 2, characterized in that a distance insert member is used.