CN209810962U - Die for calibrating circular steel tube - Google Patents

Abstract

The utility model discloses a mould for calibrating circular steel tubes, which comprises an upper mould body and a lower mould body which are symmetrically arranged up and down, wherein the mould walls of the upper mould body and the lower mould body are symmetrically provided with semi-oval openings, and at least two grid plates matched with the mould walls are oppositely arranged in the mould cavities of the upper mould body and the lower mould body; the upper die body and the lower die body are positioned and connected through a lap joint assembly; the lap joint subassembly is including setting up the fishplate bar in last die body bottom relatively to and set up the lower fishplate bar at die body top down, the fishplate bar is provided with fixing bolt with lower supporting plate is supporting. The utility model aims at providing a come control die to carry out the school circle to the steel pipe by the hydraulic press to the school circle process is quick simple and convenient, realizes utilizing the hydraulic press matched mould to carry out the school circle, replaces the plate bending machine.

Description

Die for calibrating circular steel tube

Technical Field

The utility model relates to the field of machining, especially, relate to a mould for school circular steel tube.

Background

At present, the annular seam assembly of a marine riser, a steel pile and a diagonal brace of an ocean platform is strict, so the concentricity and the ovality of a steel pipe must be ensured. In the current production project, a plate bending machine is generally adopted to round a single steel tube. The method has low efficiency, consumes manpower, and most importantly has large loss to the plate bending machine. In addition, if the steel pipe is rounded by using the plate bending machine, the rounding conflicts with the rolling process of the steel pipe by using the plate bending machine, so that the production efficiency is greatly reduced, and the rounding die for manufacturing the steel pipe is particularly important. The oil press is used for controlling the circle correcting die, so that the idle time of the oil press can be fully utilized, the working process is accelerated, and the loss of the plate bending machine is greatly reduced. Therefore, a die which is fast in rounding, convenient to operate and capable of utilizing an oil press to control and round the steel pipe is urgently needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome not enough among the above-mentioned prior art, aim at providing one kind and come control die to carry out the school circle to the steel pipe by the hydraulic press to the school circle process is quick simple and convenient, realizes utilizing the hydraulic press matched die utensil to carry out the school circle, replaces the veneer reeling machine.

In order to achieve the purpose, the utility model is realized by the following technical proposal:

a mould for calibrating circular steel tubes comprises an upper mould body and a lower mould body which are arranged in an up-down symmetrical mode, wherein the mould walls of the upper mould body and the lower mould body are symmetrically provided with semi-elliptical through holes, and at least two grid plates matched with the mould walls are oppositely arranged in the mould cavities of the upper mould body and the lower mould body; the upper die body and the lower die body are positioned and connected through a lap joint assembly; the lap joint subassembly is including setting up the fishplate bar in last die body bottom relatively to and set up the lower fishplate bar at die body top down, the fishplate bar is provided with fixing bolt with lower supporting plate is supporting.

Further, go up the mould body top and be provided with the upper base, lower mould body bottom is provided with lower base, all is provided with connecting bolt on two bases.

Furthermore, a welding bead reserved opening is formed in the top of the opening of the upper die body.

Furthermore, a guide post in a shape of a circular truncated cone is arranged on the lower connecting plate, and a guide groove matched with the guide post is arranged in the upper connecting plate.

Further, the thickness of the upper connecting plate is the same as the height of the guide post.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model discloses install and use on the hydraulic press, can replace the veneer reeling machine to carry out the school circle to the steel pipe. Can be repeatedly disassembled according to the actual requirements on site, and is flexible and convenient to install. Meanwhile, the structure is simple, the installation is convenient, and the stress is uniform after the die assembly. Compared with the traditional device, the device is simple to operate, high in safety, good in economical efficiency, strong in practicability, low in manufacturing cost and wide in application range, and can be applied and popularized in all areas with pipe roundness correction.

2. The welding bead reserved opening is formed in the top of the opening of the upper die body, after the longitudinal seam of the steel pipe is welded, the deformed area is close to the welding bead, the welding bead reserved opening is formed in the top, the welding seam position of the steel pipe can be guaranteed to be the highest point under pressure, and the circle correcting speed is improved.

3. The lap joint component in the utility model has double functions of fixing and positioning, and the fixing bolt matched with the lap joint component can facilitate the complete set fixing and complete set replacement of the die body; guide post on the lower connecting plate and the guide way in the upper connecting plate can provide the location effect for the die body pushes down when the steel pipe school circle, avoid the dislocation of upper and lower die body, make the steel pipe after the school circle level and not have the arch.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 in the direction A-A;

fig. 3 is a schematic structural diagram of the middle overlapping assembly of the present invention.

Reference numerals:

1-lower base, 2-upper base, 3-upper die body, 4-lower die body, 5-lapping component, 6-welding bead reserved opening, 7-grating plate, 8-die cavity, 51-upper connecting plate, 52-lower connecting plate, 53-guide groove, 54-guide column and 55-fixing bolt.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 3, a die for calibrating a circular steel tube includes an upper die body 3 and a lower die body 4 which are arranged vertically symmetrically, the die walls of the upper die body 3 and the lower die body 4 are symmetrically provided with semi-elliptical through openings, and at least two grid plates 7 which are matched with the die walls are oppositely arranged in the die cavities of the upper die body 3 and the lower die body 4, wherein five grid plates are provided in this embodiment; the upper die body 3 and the lower die body 4 are positioned and connected through a lap joint assembly; the lap joint assembly comprises an upper connecting plate 51 and a lower connecting plate 52, wherein the upper connecting plate 51 is oppositely arranged at the bottom of the upper die body 3, the lower connecting plate 52 is arranged at the top of the lower die body 4, and the upper connecting plate 51 and the lower connecting plate 52 are provided with fixing bolts 55 in a matched mode; a welding bead reserved opening 6 is formed in the top of the opening of the upper die body 3; the top end of the upper die body 3 is provided with an upper base 2, the bottom end of the lower die body 4 is provided with a lower base 1, and the two bases are provided with connecting bolts.

The utility model discloses during the use, pull down fixing bolt on the overlap joint subassembly earlier, be fixed in hydraulic press base and last moulding-die with connecting bolt for lower base of school circle mould and upper base again. When the upper pressing die of the oil press rises, the upper base of the circle correcting die is lifted at the same time, at the moment, the steel pipe is placed in the arc surface of the grating plate of the lower base, the longitudinal seam of the steel pipe is aligned with the weld bead reserved opening, when the oil press descends, the upper die body and the lower die body are folded, the grating plates for circle correction are uniformly distributed in the die cavity of the die body, and the steel pipe is subjected to micro-pressure from all angles to finish the circle correcting work of the steel pipe.

The lower connecting plate 52 is provided with a circular truncated cone-shaped guide post 54, the upper connecting plate 51 is provided with a guide groove 53 matched with the guide post 54, and the thickness of the upper connecting plate 51 is the same as the height of the guide post 54. The guide post and the guide way that match each other can make full use of the characteristics that the round platform bottom surface is greater than the top surface, have made things convenient for the guide post top to insert the guide way to the guide way inner wall along the round platform shape removes, thereby guide post and guide way coincide completely, provide accurate location for the pushing down of last die body, when avoiding upper and lower die body to push down the school circle to the steel pipe, inside grid board misplaces mutually.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a mould for school circular steel tube, includes the last die body and the lower die body that the longitudinal symmetry set up, its characterized in that: the mold walls of the upper mold body and the lower mold body are symmetrically provided with semi-elliptical through holes, and at least two grid plates matched with the mold walls are oppositely arranged in the mold cavities of the upper mold body and the lower mold body; the upper die body and the lower die body are positioned and connected through a lap joint assembly; the lap joint subassembly is including setting up the fishplate bar in last die body bottom relatively to and set up the lower fishplate bar at die body top down, the fishplate bar is provided with fixing bolt with lower supporting plate is supporting.

2. A die for calibrating tubular steel products according to claim 1, wherein: the die is characterized in that an upper base is arranged at the top end of the upper die body, a lower base is arranged at the bottom end of the lower die body, and connecting bolts are arranged on the two bases.

3. A die for calibrating a round steel tube according to claim 2, wherein: and a welding bead reserved opening is formed in the top of the opening of the upper die body.

4. A die for calibrating tubular steel products according to claim 1, wherein: the lower connecting plate is provided with a guide post in a circular truncated cone shape, and the upper connecting plate is provided with a guide groove matched with the guide post.

5. A die for calibrating tubular steel products according to claim 4, wherein: the thickness of the upper connecting plate is the same as the height of the guide post.