Portable pipe end rounder

Abstract

This portable steel pipe end rounding tool is used to round off-center steel pipe ends into standard circles. It consists of a working head, a striking head, and a handle. Both the working head and the striking head are made of steel and have undergone heat treatment to achieve a hardness ≥25HRC. The working head and the striking head are connected and fixed via drilling, threading, and welding, ensuring their centerlines are aligned and their relative positions are fixed. The working head is a frustum-shaped cone, wider at the top and narrower at the bottom, with a taper of 6~12 degrees. 0 The working head is machined into an arc shape. This utility model allows two people to easily complete the pipe end rounding operation without unbundling or moving the pipe, saving time, effort, and money.

Description

Technical Field

[0001] This utility model belongs to metallurgical auxiliary tools and relates to a portable steel pipe end gauge. Background Technology

[0002] During the rolling process of seamless steel pipes, excessive reduction in diameter can easily lead to uneven deformation, resulting in an inner hole resembling a regular hexagon when viewed from the pipe end cross-section. This can cause problems such as misalignment during welding, affecting weld quality. If the hexagonal inner hole is severe, the pipe end needs to be treated to make it round.

[0003] Existing methods include: 1) using a lathe for internal boring, which requires transferring the steel pipe to a specific workbench for processing, involving multiple steps such as mounting, fixing, and machining, resulting in high costs. 2) internal grinding, using an internal grinding machine to grind the pipe ends, which is also time-consuming, labor-intensive, and inefficient. Utility Model Content

[0004] The present invention aims to provide a tapered hammer-shaped steel pipe end rounding tool, which can easily and quickly straighten the non-circular steel pipe end into a standard circle.

[0005] The technical solution of this utility model:

[0006] This portable steel pipe end rounding tool is used to round off-center steel pipe ends into standard circles. It consists of a working head, a striking head, and a handle. Both the working head and the striking head are made of steel and have undergone heat treatment to a hardness ≥25HRC. The working head and the striking head are connected and fixed via drilling, threading, and welding, ensuring their centerlines are aligned and their relative positions are fixed. The working head is a frustum shape, wider at the top and narrower at the bottom, with a taper of 6–12 degrees. 0 .

[0007] Furthermore, the end of the working head is machined into an arc shape to make it easier to strike into the steel pipe opening.

[0008] This invention allows the working head to be made into a frustum shape with different diameters and tapers according to the different diameters of the steel pipes. It is particularly suitable for rounding the inner hole of the pipe end of small-diameter, thin-walled boiler pipes with an outer diameter of less than 108mm and a wall thickness of less than 8mm.

[0009] The beneficial effects of this invention are as follows: Because the working head is a truncated cone shape with a larger top and smaller bottom, it is forcibly inserted into the steel pipe opening by striking the working head with a hammer, thus rounding the pipe opening under force. Specifically, one worker holds a long handle to guide the working head horizontally into the pipe opening, accurately aligning it with the central axis of the steel pipe, and then another worker strikes the working head horizontally with a hammer. This invention allows two people to easily complete the pipe end rounding operation without unbundling or moving the pipe, saving time, effort, and money. Attached Figure Description

[0010] Figure 1 Front view of a portable pipe end gauge.

[0011] Figure 2 Left view of a portable pipe end gauge.

[0012] Figure 3 Top view of a portable pipe end gauge.

[0013] Figure 4 This is a schematic diagram of the working state of a portable pipe end gauge.

[0014] In the diagram: 1-Working head; 2-Strike head; 3-Handle. Detailed Implementation

[0015] The following description, in conjunction with the accompanying drawings, illustrates the embodiments.

[0016] Figure 1 , Figure 2 , Figure 3 As shown: A portable steel pipe end gauge rounding tool. The working head 1 is 60mm long and machined from a round steel billet; the striking head 2 is 200mm long and made from a thin round bar; and the handle 3 is 500mm long and made from a small steel pipe. Both the working head 1 and the striking head 2 are made of steel and undergo heat treatment to achieve a hardness ≥25HRC. The working head 1 and the striking head 2 are connected and fixed by drilling, threading, and spot welding, ensuring their center lines are aligned and their relative positions are fixed. The working head 1 is a frustum shape, wider at the top and narrower at the bottom, with a taper of 6-12. 0 The end of the working head is machined into an arc shape to facilitate striking the steel pipe opening without damaging the inner surface of the pipe end.

[0017] This utility model can make the working head 1 into a frustum shape of different sizes and tapers according to the different inner diameters of the steel pipe to be shaped, and the end with the smaller diameter is processed into an arc shape.

[0018] Figure 4 As shown: During operation, one worker holds the working handle 3 and inserts the working head 1 horizontally into the end of the steel pipe until it cannot move. Another worker, after visually aligning the working head with the center line of the steel pipe, uses a hammer to strike the head 2, causing the working head 1 to be embedded a certain distance into the steel pipe, so that the inner hole of the pipe end is visible to the naked eye. After completion, the handle 3 is turned to remove the roundness gauge.

[0019] Generally, if the inner hole of the pipe end is not round, two hammer blows will achieve the effect of rounding the inner hole. For severe cases of non-roundness of the inner hole of the pipe end, the above-mentioned rounding action can be repeated once.

Claims

1. A portable steel pipe end rounding tool, used to round off-circular steel pipe ends into standard circles, characterized in that: It is composed of a working head, a hitting head and a handle, the working head and the hitting head are made of steel and are subjected to quenching and tempering heat treatment, the hardness is greater than or equal to 25HRC; the working head and the hitting head are connected and fixed through drilling + threading + welding, the center lines of the two are kept consistent and the relative positions are fixed; the working head is a circular truncated cone with the upper part being large and the lower part being small, the circular truncated cone taper is 6~12 0 .

2. The portable steel pipe end gauge according to claim 1, characterized in that: The end of the working head is machined into an arc shape.

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