阅读说明：本技术 一种用于制备螺纹钢的刀具及螺纹钢制备工艺 (Tool for preparing deformed steel bar and deformed steel bar preparation process ) 是由 杜海萍 于 2020-07-29 设计创作，主要内容包括：本发明提出了一种用于制备螺纹钢的刀具及螺纹钢制备工艺,涉及预应力桥梁、船坞、码头、建筑工程等领域。一种用于制备螺纹钢的刀具,包括刀具本体,滚丝轮本体,滚丝轮本体的齿牙呈连续螺纹状。采用本发明的刀具进行轧制的精轧螺纹筋保持了与原有方法生产螺纹钢的一切特性,而且将不连续的外螺纹变成了连续的外螺纹,使用更加安全,螺纹精度更高。(The invention provides a cutter for preparing deformed steel bars and a deformed steel bar preparation process, and relates to the fields of prestressed bridges, docks, wharfs, constructional engineering and the like. A cutter for preparing deformed steel bars comprises a cutter body and a thread rolling wheel body, wherein teeth of the thread rolling wheel body are in a continuous thread shape. The finish rolling threaded bar rolled by the cutter keeps all characteristics of the prior method for producing the deformed steel bar, and discontinuous external threads are changed into continuous external threads, so that the use is safer, and the thread precision is higher.)

1. The cutter for preparing the deformed steel bar is characterized by comprising a thread rolling wheel body, wherein teeth of the thread rolling wheel body are in a continuous thread shape.

2. The tool for manufacturing deformed steel bars according to claim 1, wherein the thread form of the die roller body has a trapezoidal shape.

3. The tool for manufacturing deformed steel bars according to claim 2, wherein the pitch of the teeth is 10mm to 26mm, the height of the teeth is 1mm to 5mm, and the width of the teeth is 4.2mm to 15 mm.

4. A process for the preparation of a deformed steel bar according to any one of claims 1 to 3, comprising the following steps:

s1, finishing the hot-rolled round steel to reach the required diameter before rolling the thread;

s2, placing the hot-rolled round steel on a transmission mechanism, and transmitting the hot-rolled round steel to heating equipment for uniform heating;

s3, continuously conveying the round steel heated in the step S2 to a thread rolling machine with a thread rolling wheel body through a conveying mechanism to roll threads;

s4, carrying out subsequent heat treatment on the round steel rolled in the step S4;

and S5, collecting the qualified finish-rolled deformed steel bars.

5. The process according to claim 4, wherein the conveying mechanism and the heating device in step S2 are a skew roll conveying and medium-frequency heating furnace, respectively.

6. A process for preparing deformed steel bar according to claim 5, wherein the heating temperature of the intermediate frequency heating furnace is 300 ℃ to 1150 ℃.

7. The process for producing a deformed steel bar according to claim 4, wherein the barrel bodies for the finish-rolled deformed steel bar are rotated in the same direction in the step S3.

8. The process for preparing deformed steel bar according to claim 7, wherein the rotating speed of the thread rolling die body is 15r/min to 45 r/min.

9. The process of claim 4, wherein the thread rolling machine in step S3 adopts a cooling device to cool the thread rolling wheel.

10. The process for preparing deformed steel bar according to claim 4, wherein the subsequent heat treatment comprises normalizing, tempering, quenching and tempering, and post-rolling residual heat quenching.

Technical Field

The invention relates to the field of prestressed engineering construction, in particular to a cutter for preparing deformed steel bars and a deformed steel bar preparation process.

Background

The twisted steel for prestressed concrete (also called finish rolled twisted steel) is a straight steel bar with a large diameter, high strength and high dimensional accuracy, in which discontinuous external threads are rolled on the whole steel bar. The steel bar can be screwed with a connector with internal threads at any section to be connected or screwed with a nut with threads to be anchored, and has the advantages of simple connection, convenient construction and the like.

The conventional production method for rolling round steel into the twisted steel at present is to perform casting blank in a steel mill and then perform multi-pass rolling on a rolling mill for forming, and the process flow is as follows: converter smelting → ladle vanadium microalloying → LF refining → full protection casting billet → billet inspection → heating furnace heating → controlled rolling → controlled cooling after rolling. The production process is too complex, the main difficulty lies in high precision of the overall dimension and stable overall length, and the teeth must be adjusted by the phase adjusting device to ensure that the transverse ribs of the threads on two sides are on the same spiral line.

Disclosure of Invention

The invention aims to provide a tool for preparing deformed steel bars, which can roll hot-rolled round steel bars with continuous external threads, and is safer to use and higher in precision.

Another object of the present invention is to provide a process for producing a deformed steel bar, which can effectively reduce the process flow of finish rolling of the deformed steel bar.

The embodiment of the invention is realized by the following steps:

in a first aspect, the embodiment of the present application provides a tool for manufacturing deformed steel bars, which includes a thread rolling wheel body, wherein teeth of the thread rolling wheel body are in a continuous thread shape.

In some embodiments of the present invention, the thread profile of the thread rolling die body has a trapezoidal shape.

In some embodiments of the present invention, the pitch of the teeth is 10mm to 26mm, the height of the teeth is 1mm to 5mm, and the width of the teeth is 4.2mm to 15 mm.

In a second aspect, an embodiment of the present application provides a preparation process of the deformed steel bar, including the following steps:

s1, finishing the hot-rolled round steel to reach the required diameter before rolling the thread;

s2, placing the hot-rolled round steel on a transmission mechanism, and transmitting the hot-rolled round steel to heating equipment for uniform heating;

s3, continuously conveying the round steel heated in the step S2 to a thread rolling machine with a thread rolling wheel body through a conveying mechanism to roll threads;

s4, carrying out subsequent heat treatment on the deformed steel bar rolled in the step S3;

and S5, collecting the qualified finish-rolled deformed steel bars.

In some embodiments of the present invention, the conveying mechanism and the heating device in the step S2 adopt oblique roller conveying and medium frequency heating furnaces, respectively.

In some embodiments of the present invention, the heating temperature of the intermediate frequency heating furnace is 300 ℃ to 1150 ℃.

In some embodiments of the present invention, the rolling mill body for clamping rolling the finish rolled round steel in the step S3 is rotated in the same direction.

In some embodiments of the invention, the rotating speed of the thread rolling wheel body is 15 r/min-45 r/min.

In some embodiments of the present invention, the thread rolling machine in step S3 above employs a cooling device.

In some embodiments of the present invention, the post-heat treatment includes normalizing, tempering, quenching and tempering, and post-rolling residual heat quenching.

Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:

the embodiment provides a cutter for preparing deformed steel bar, which comprises a thread rolling wheel body, wherein teeth of the thread rolling wheel body are in a thread shape. The finish rolling deformed steel bar rolled by the tool of the invention keeps all the characteristics of the finish rolling deformed steel bar produced by the original method, and discontinuous external threads are changed into continuous external threads, so the tool is safer to use, and the thread precision is higher.

When in actual use, the heated round steel is placed between the two thread rolling wheel bodies for rolling, radial compressive stress is provided for the round steel, and continuous external threads are rolled.

The embodiment provides a preparation process of the deformed steel bar, which comprises the following steps:

s1, finishing the hot-rolled round steel to reach the required diameter before rolling the thread;

s2, placing the hot-rolled round steel on a transmission mechanism, and transmitting the hot-rolled round steel to heating equipment for uniform heating;

s3, continuously conveying the round steel heated in the step S2 to a thread rolling machine with a thread rolling wheel body through a conveying mechanism to roll threads;

s4, carrying out subsequent heat treatment on the workpiece rolled in the step S3;

and S5, collecting the qualified finish-rolled deformed steel bars.

The invention breaks through the conventional production process of finish rolling threaded steel bars, the raw material adopts rolled round steel, multi-pass rolling mill equipment is not needed, the main processing equipment comprises thread rolling equipment and heating equipment, the thread rolling equipment is provided with a specially-made thread rolling wheel, the thread shape of the thread rolling wheel is consistent with the thread shape required by the threaded steel, the front section of the thread rolling machine is provided with a heating device, the round steel enters the thread rolling machine for hot rolling after passing through the heating device, and after the rolling is finished, the online heat treatment can be subsequently carried out to meet the mechanical property requirement of the finish rolling threaded steel bars.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of a thread rolling die body according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a tooth according to an embodiment of the present invention;

FIG. 3 is a flow chart of a process for preparing deformed steel bar according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a round steel rolled by the thread rolling roller body according to the embodiment of the invention.

Icon: 1-a thread rolling wheel body; 2-round steel; 3-heating equipment; 4-a thread roller; 5-cooling equipment.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are usually placed in when used, the orientations or positional relationships are only used for convenience of describing the present invention and simplifying the description, but the terms do not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operate, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, "a plurality" represents at least 2.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.