CN213701617U - Thread rolling wheel for concrete reinforcing bar - Google Patents

Abstract

The application discloses concrete reinforcement's thread rolling wheel includes: the wheel body is provided with a shaft hole and thread rolling teeth; the wheel body is a revolution body formed around a central axis; the shaft hole is formed by extending along the central axis approximately; defining a plane on which the central axis is positioned as a projection plane, wherein the tooth top shape of the thread rolling tooth comprises a round angle in the projection of the projection plane, and the radius R of the round angle is 0.35 mm; defining the distance from the top to the bottom of the thread rolling teeth as the tooth height; the tooth height range of the thread rolling teeth is between 1.37 and 1.56; the diameter range of the shaft hole is 34 mm to 34.5 mm; the largest outer diameter of the thread rolling teeth of the wheel body ranges from 77 millimeters to 77.8 millimeters. The concrete reinforcement rolling die has the beneficial effects that the concrete reinforcement rolling die can provide a high rolling effect.

Description

Thread rolling wheel for concrete reinforcing bar

Technical Field

The application relates to a thread rolling wheel, in particular to a thread rolling wheel for concrete reinforcing bars.

Background

Reinforcing steel bars (rebars) are steel materials for reinforced concrete and prestressed reinforced concrete, and have a circular cross section, and sometimes a square cross section with rounded corners. Comprises plain round steel bars, ribbed steel bars and twisted steel bars.

The reinforcing steel bar for reinforced concrete is straight bar or wire rod-shaped steel for reinforcing steel bar for reinforced concrete, the shape of the reinforcing steel bar is smooth steel bar and deformed steel bar, and the delivery state is straight bar and wire rod.

The plain round steel bars are actually small round steel and wire coils of ordinary low-carbon steel. Deformed bars are surface ribbed bars, usually with 2 longitudinal ribs and transverse ribs distributed uniformly along the length. The cross ribs are 3 types of spiral, herringbone and crescent shapes. Expressed in millimeters of nominal diameter. The nominal diameter of the deformed steel bar is equivalent to the nominal diameter of the smooth steel bar with the same cross section. The nominal diameter of the rebar is 6 to 50 millimeters, with 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 32 millimeters being preferred. Steel grade: 20MnSi, 20MnV, 25MnSi, BS20 MnSi. The steel reinforcement is mainly subjected to tensile stress in the concrete. The deformed reinforcing steel bar has larger bonding capacity with concrete due to the action of the ribs, so that the deformed reinforcing steel bar can better bear the action of external force. Reinforcing bars are widely used in various building structures. Especially large, heavy, light-duty thin-walled and high-rise building structures.

The existing steel bars can be connected by using the sleeve for combination, so the two ends of the steel bars are always required to be externally threaded by turning, but the existing thread rolling wheels are not firm enough when the steel bars are connected by the sleeve due to unreasonable structures, and the processing efficiency is at the bottom of the steel bars.

The addendum and the dedendum of the thread rolling wheel are flat bottoms, in the thread forming process, the extrusion type cutting is possibly generated on the material except for the extrusion of the external addendum, the cutting part can generate extremely small scratch cracks on the dedendum, in the subsequent fatigue stretching process of the material, the material can be damaged to break, and the ultimate strength of the mechanical connection of the reinforcing steel bar can not be ensured.

In the extrusion process, the tooth root of the thread rolling wheel is flat, and the tooth surface and the tooth root are connected by a break angle, so that the force arm of stress is longer in the ultimate stretching process of each tooth, and the slip tooth or the broken tooth is easily caused at the break angle, so that the steel bar slides out when the steel bar does not reach the ultimate strength in the sleeve.

Disclosure of Invention

A concrete reinforcing bar thread roller comprising: the wheel body is provided with a shaft hole and thread rolling teeth; the wheel body is a revolution body formed around a central axis; the shaft hole is formed by extending along the central axis approximately; defining a plane on which the central axis is positioned as a projection plane, wherein the tooth top shape of the thread rolling tooth comprises a round angle in the projection of the projection plane, and the radius R of the round angle is 0.35 mm; defining the distance from the top to the bottom of the thread rolling teeth as the tooth height; the tooth height range of the thread rolling teeth is between 1.37 and 1.56; the diameter range of the shaft hole is 34 mm to 34.5 mm; the largest outer diameter of the thread rolling teeth of the wheel body ranges from 77 millimeters to 77.8 millimeters.

Further, the width W of the bottom shape of the thread rolling teeth is 0.39 mm.

Further, the tooth height of the thread rolling teeth ranges from 1.47 mm to 1.56 mm.

Further, the distance between the tooth tops of different thread rolling teeth defines a tooth top difference, and the value range of the tooth top difference is 0.14 mm to 0.72 mm.

Further, the difference between the tooth heights of the thread rolling teeth is defined as the tooth height difference, and the value range of the tooth height difference is less than or equal to 0.7 mm.

Furthermore, the wheel body also comprises two transition parts, and the two transition parts are respectively arranged between the two end surfaces of the wheel body and the thread rolling teeth; the projection of the transition part in the projection plane comprises a bevel edge obliquely intersected with the end face and an arc edge connecting the bevel edge and the end face.

Furthermore, the arc edge is arc-shaped, and the radius of the arc edge is 1.5 mm; the bevel edge is a straight line edge, and the range of the included angle formed by the straight line edge and the central axis is 17 degrees.

Further, the thread rolling teeth are divided into three groups according to the tooth heights, the thread rolling teeth in the same group have the same tooth height, and the thread rolling teeth in the same group are at least adjacent to the thread rolling teeth in one group; the thread rolling teeth with the larger tooth height are arranged between the two groups of thread rolling teeth with the smaller tooth height.

Further, the projected tooth tops of the thread rolling wheels on the projection plane are at least located on two different straight lines.

Further, the tooth tops of the thread rolling wheels in one group with the same tooth height are located on the same straight line.

Further, the included angle between two different straight lines is 2 to 5 degrees.

Further, one of the two distinct straight lines is parallel to the central axis.

Further, the straight line of the top of the thread rolling teeth in the group with smaller tooth height obliquely intersects with the central axis.

Further, the included angle of the side edge of the thread rolling teeth is 60 degrees.

Further, the tooth pitch of the thread rolling teeth is 2.5 mm.

The application has the advantages that:

the thread rolling wheel for the concrete reinforcing steel bar can provide a high thread rolling effect.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

FIG. 1 is a schematic cross-sectional view of a thread roller according to the present application;

FIG. 2 is an enlarged view of the thread rolling die of FIG. 1 at the thread rolling teeth.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. 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 application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 2, the roller 100 for a concrete reinforcing bar includes: a wheel body 101. Specifically, wheel body 101 is formed with shaft hole 102 and thread rolling teeth 103; the wheel body 100 is substantially a solid of revolution formed around the central axis S; the shaft hole 102 is formed extending substantially along the center axis S; a plane on which a central axis S is located is defined as a projection plane (e.g., a plane of a paper surface in fig. 1 and 2), in a projection of the thread rolling teeth 103 on the projection plane, a tooth top shape of the thread rolling teeth 103 includes a rounded corner 103a, and a radius R of the rounded corner 103a is 0.35 mm.

By adopting the above scheme, especially the design of the shape and the size of the tooth top, the cutting of the tooth top processing steel bar body can not be generated when the thread rolling wheel 100 rolls threads.

Defining the distance from the top to the bottom of the thread rolling teeth 103 as the tooth height H; the tooth height H of the threading teeth 103 ranges from 1.37 to 1.56.

Specifically, the width W of the root shape of the thread rolling teeth 103 is 0.39 mm.

Specifically, the tooth height H of the thread rolling teeth 103 ranges from 1.47 mm to 1.56 mm.

Specifically, the distance between the tooth tops of the different thread rolling teeth 103 defines a tooth top difference K, and the value of the tooth top difference K ranges from 0.14 mm to 0.72 mm.

Specifically, the difference between the tooth heights H of the thread rolling teeth 103 is referred to as a tooth height difference Δ H, and the value range of the tooth height difference Δ H is 0.13 mm to 0.70 mm.

By adopting the scheme, when the thread rolling wheel 103 is used for extrusion forming of the steel bar body, the material flow direction gradually flows to the final three-unsaturated thread teeth, and the inlet angle of the thread rolling wheel is controlled.

Specifically, the wheel body 101 further includes two transition portions 104, and the two transition portions 104 are respectively disposed between two end surfaces 105 of the wheel body 101 and the thread rolling teeth 103; the transition portion 104 includes a sloping edge 106 obliquely intersecting the end face 105 and an arc edge 107 connecting the sloping edge 106 and the end face 105.

Specifically, the arc edge 107 is circular arc, and the radius of the arc edge is 1.5 mm; the inclined edge 106 is a straight edge, and an included angle a formed by the straight edge and the central axis S is 17 degrees.

Specifically, the dimension M of the transition portion 104 in the direction of the central axis S takes a value of 3.95 mm.

Specifically, the thread rolling teeth 103 are divided into three groups 10, 20 and 30 according to the tooth height H, the thread rolling teeth 103 in the same group have the same tooth height H, and the thread rolling teeth 103 in the same group are arranged adjacent to at least one thread rolling tooth 103 in the same group; the group 20 of the thread rolling teeth 103 having the larger tooth height H is provided between the two groups 10, 20 of the thread rolling teeth 103 having the smaller tooth height H.

Specifically, the tooth tops of the projections of the thread rolling wheels 103 on the projection plane are located on at least two different straight lines L1, L2 (or L2, L3). Specifically, the tops of the thread rolling wheels 103 having the same tooth height are located on the same straight line. The angle b between two distinct straight lines is 2 to 5 degrees, preferably 3 degrees.

Specifically, one of the straight lines L2 is parallel to the center axis S. Specifically, a straight line L1 (or L3) on which the tooth tips of the group 10 (or 30) of thread rollers 103 having a smaller tooth height intersect the center axis S obliquely.

Specifically, the included angle c of the side 108 of the thread rolling teeth is 60 degrees.

By adopting the technical scheme, the scheme of the application has the following advantages:

1. the tooth top of the thread rolling wheel is made into a round angle, so that the tooth root of the thread after thread rolling is in arc transition, the extrusion cutting scars cannot be generated in the extrusion process, and the reliability is ensured

2. The tooth top of the thread rolling wheel is made into a round angle, the tooth root of the external thread of the steel bar is integrally stressed in the stretching process of the steel bar, the tooth breakage is not easy to generate, and the integral strength of the external thread is ensured when the steel bar is stretched in the limit

3. The tooth height is reduced, and the tooth thickness is enhanced, so that the teeth are not easy to break. The tooth height cannot be too short, and if the tooth height is too short, the meshing surface is too small, and the teeth are easy to slide.

4. The front end of the thread rolling wheel is reserved with a steel bar entering angle, and the last three teeth to five teeth are unsaturated teeth at the last stage of thread rolling of the steel bar, wherein the unsaturated degree of the last three feet is larger, so that the strength of the sleeve at the sleeve joint rear edge with the steel bar is enhanced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (14)

1. The utility model provides a thread rolling wheel of concrete reinforcement which characterized in that:

the thread rolling wheel for the concrete reinforcing steel bar comprises:

the wheel body is provided with a shaft hole and thread rolling teeth;

the wheel body is a revolution body formed around a central axis;

the shaft hole is formed by extending along the central axis approximately; defining a plane on which the central axis is positioned as a projection plane, wherein the tooth top shape of the thread rolling tooth comprises a round angle in the projection of the projection plane, and the radius R of the round angle is 0.35 mm;

defining the distance from the top to the bottom of the thread rolling teeth as the tooth height;

the diameter range of the shaft hole is 34 mm to 34.5 mm;

the largest outer diameter of the thread rolling teeth of the wheel body ranges from 77 millimeters to 77.8 millimeters;

the tooth height of the thread rolling teeth ranges from 1.37 mm to 1.56 mm.

2. A concrete reinforcing bar thread roller according to claim 1, wherein:

the width W of the bottom shape of the thread rolling teeth is 0.39 mm.

3. A concrete reinforcing bar thread roller according to claim 1, wherein:

and defining the distance between the tooth tops of different thread rolling teeth to be tooth top difference, wherein the value range of the tooth top difference is 0.14-0.72 mm.

4. A concrete reinforcing bar thread roller according to claim 1, wherein:

and defining the difference between the tooth heights of the thread rolling teeth as the tooth height difference, wherein the value range of the tooth height difference is less than or equal to 0.7 mm.

5. A concrete reinforcing bar thread roller according to claim 1, wherein:

the wheel body further comprises two transition parts, and the two transition parts are respectively arranged between the two end surfaces of the wheel body and the thread rolling teeth; the projection of the transition part in the projection plane comprises a bevel edge obliquely intersected with the end face and an arc edge connecting the bevel edge and the end face.

6. A concrete reinforcing bar thread roller according to claim 5, wherein:

the arc edge is arc-shaped, and the radius of the arc edge is 1.5 mm; the bevel edge is a straight line edge, and the range of the included angle formed by the straight line edge and the central axis is 17 degrees.

7. A concrete reinforcing bar thread roller according to claim 1, wherein:

the thread rolling teeth are divided into three groups according to the tooth heights, the thread rolling teeth in the same group have the same tooth height, and the thread rolling teeth in the same group are at least adjacent to one thread rolling tooth in the same group; the thread rolling teeth with the larger tooth height are arranged between the two groups of thread rolling teeth with the smaller tooth height.

8. A concrete reinforcing bar thread roller according to claim 7, wherein:

the projected tooth tops of the thread rolling wheels on the projection plane are at least positioned on two different straight lines.

9. A concrete reinforcing bar thread roller according to claim 8, wherein:

the tooth tops of the thread rolling wheels with the same tooth height are positioned on the same straight line.

10. A concrete reinforcing bar thread roller according to claim 9, wherein:

the included angle between two different straight lines is 2 to 5 degrees.

11. A concrete reinforcing bar thread roller according to claim 10, wherein:

one of the two distinct straight lines is parallel to the central axis.

12. A concrete reinforcing bar thread roller according to claim 9, wherein:

the straight line of the top of the thread rolling teeth in the group with smaller tooth height obliquely intersects with the central axis.

13. A concrete reinforcing bar thread roller according to claim 9, wherein:

the included angle of the side edges of the thread rolling teeth is 60 degrees.

14. A concrete reinforcing bar thread roller according to claim 9, wherein:

the tooth spacing of the thread rolling teeth is 2.5 mm.

Images