Cutter head self-positioning device of thread milling cutter for twisted steel finished product roller

Abstract

A cylindrical groove is vertically formed in a cutter bar, a cutter head is arranged in the groove, one end of the cutter head is cylindrical and tightly attached to the inner wall of a groove body, the other end of the cutter head is a cutting face, and a datum plane is arranged on the outer side of the cylindrical end of the cutter head. A mounting hole is formed in the cutter bar and is perpendicular to the cylindrical groove, the cut-off end of the mounting hole is flush with the cutter bar, a pressing jackscrew is arranged in the mounting hole, the jackscrew is in sliding fit with the cutter bar and abuts against and is attached to the reference surface, and the pressing jackscrew is locked after being automatically aligned. The tool bit installation angle is ensured to be consistent with the designed transverse rib machining parameter beta angle, the machined transverse rib is consistent with the designed alpha angle, good symmetry is achieved, the design meets the cold bending performance requirements of rolled deformed steel bars and anchor rod steel bars, and the cracking problem caused by stress concentration of the root of the transverse rib is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of cutter head installation technology, specifically a self-positioning device for the cutter head of a thread milling cutter for finished threaded steel bar rolls. Background Technology

[0002] Threaded steel bars and anchor bars employ a crescent rib design to increase anchoring force with concrete and resin anchoring agents. However, during production, quality issues such as cold bending cracks often arise due to stress concentration at the root of the transverse ribs. Analysis reveals that the main cause is inaccurate control of the transverse rib processing parameters, leading to difficulties in grooving. Stress concentration at the root of the transverse ribs along the rolling direction, as well as obvious cracks and grooves at the junction of the transverse rib root and the base circle, are the primary reasons for cracking at the root of the transverse ribs during cold bending and stretching, resulting in low elongation after fracture. According to design principles, reducing stress concentration at the root of the transverse ribs involves optimizing the α and β angles in the transverse rib processing parameters, which aids in grooving design. However, the problems of grooves at the root of the transverse ribs and cold bending cracks persist. Upon further investigation, comparing normal and cracked samples on-site, it was found that the cracked samples had severe grooves at the root of the transverse ribs and asymmetrical α angle. Analysis indicated that improper machining of the α angle was the root cause of this problem. Because the thread milling machine uses a thread cutter, it was impossible to ensure that the cutter head angle matched the designed β angle during installation, leading to asymmetrical α angle during thread machining. In the production of ordinary threaded steel bars and anchor rod steel bars, scratches were also found on the surface of the transverse ribs, and small cracks appeared at the root of some transverse ribs. These transverse rib scratches and root cracks severely affect the surface quality and performance of the steel. Transverse rib scratches weaken the grip strength, while transverse rib root cracks severely affect cold bending performance. Due to these defects, threaded steel bars are often judged as scrap during quality inspection.

[0003] The cross-section of the transverse ribs of threaded steel bars should be an equilateral trapezoid. However, after the transverse ribs are scratched, their cross-sectional shape becomes triangular, and severe scratches remain on the surface of the transverse ribs. Cracks at the root of the transverse ribs only appear on one side of the transverse ribs. To eliminate this defect, it is necessary to analyze its cause and take necessary measures in the process to ensure product quality. Judging from the scratches and root cracks on the transverse ribs, it is clear that these defects are generated during the rolling process. Because the transverse ribs of threaded steel bars bulge periodically along the longitudinal direction, there is sliding between the rolls and the workpiece during the rolling process. This sliding action causes the transverse ribs to be subjected to shear stress, which in turn causes scratches and root cracks. Although measures have been taken to reduce stress concentration and stress problems in the design of transverse rib parameters, cold bending cracks and root grooves at the root of the transverse ribs still occasionally occur during the mature rolling process. Through comparison and analysis of field samples, another reason was found to be poor processing precision and human factors. Because the cutter head was installed without positioning reference and was installed entirely based on experience, the processing personnel did not fully realize this problem, resulting in asymmetrical processing of the transverse rib α angle, which in turn aggravated stress concentration. Utility Model Content

[0004] The purpose of this utility model is to provide a self-positioning device for the thread milling cutter head of the finished threaded steel bar roll, so as to solve the problem that when using thread milling machines, it is impossible to ensure that the cutter head angle is consistent with the designed β angle during installation, which leads to asymmetry of the α angle during thread processing. The cutter head is installed without positioning reference and is installed entirely based on experience. The processing personnel are not fully aware of this problem, which leads to asymmetry in the processing of the transverse rib α angle, and further aggravates the problem of stress concentration.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-positioning device for a thread milling cutter head of a finished threaded rebar roll, comprising a cutter bar, a cutter head, and a clamping set screw. A cylindrical groove is vertically formed on the cutter bar, and the cutter head is provided in the groove. One end of the cutter head located in the groove is cylindrical, and the outer circumference of the cylinder is tightly fitted with the inner wall of the groove. The other end of the cutter head is a cutting surface. A reference surface is formed on the outer circumference of the end of the cutter head located in the groove. The reference surface is set at an angle β with the cutting end of the cutter head. A mounting hole is vertically formed at one end of the cylindrical groove. The mounting hole is coaxial with the cutter bar, and the cut-off end of the mounting hole is flush with the cut-off end of the cutter bar. A clamping set screw is provided in the mounting hole, and the clamping set screw is slidably fitted with the cutter bar. The clamping set screw passes through the mounting hole, and its top end abuts against and fits against the reference surface.

[0006] Preferably, the β angle is consistent with the β angle of the thread milling machine, which is 45°-70°.

[0007] Preferably, the end of the clamping set screw away from the cutter head has an external thread groove, and the mounting hole has an internal thread groove, so that the clamping set screw is screwed onto the cutter bar.

[0008] Preferably, the end of the clamping set screw away from the cutter head has an internal hexagonal groove for screwing the clamping set screw in.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] By automatically aligning and flattening the clamping rod with the reference surface during the installation of the cutter head, and then locking the clamping rod, the installation angle of the cutter head can be consistent with the design parameters of the transverse rib processing, β angle. The processed transverse ribs are consistent with the design parameters of α angle and are symmetrical, which meets the requirements of cold bending performance when rolling threaded steel and anchor rods, and solves the problem of cracking caused by stress concentration at the root of the transverse rib. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the cooperation structure between the clamping set screw and the knife bar of this utility model.

[0013] Figure 3This is a schematic diagram of the interoperability between the cutter head and the reference surface of this utility model.

[0014] In the diagram: 1. Tool holder; 2. Tool head; 3. Set screw; 4. Reference surface. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: Please refer to Figure 1-3This utility model provides an embodiment of a thread milling cutter head self-positioning device for finished threaded steel bar rolls, comprising a cutter shank 1, a cutter head 2, and a clamping set screw 3. A cylindrical groove is vertically formed on the cutter shank 1, which is the main body of the tool and supports the cutter head 2. The cylindrical groove on the cutter shank 1 accommodates the cutter head 2, while the mounting hole allows the position of the cutter head 2 to be fixed by the clamping set screw 3, enabling the installer to accurately install the cutter head 2. The cylindrical groove allows the portion of the cutter head 2 away from the cutting end to be stably installed within the groove, while simultaneously ensuring a tight fit and contact with the inside of the groove, preventing displacement of the cutter head 2 and improving tool stability. The cutter head 2 is housed within the groove. The head 2, located at one end within the groove, is cylindrical. The head 2 is the core component of the cutting tool, its cutting surface used for actual machining. The design of the head 2 allows it to be positioned with the tool holder 1 through a tight fit within the groove. A reference surface 4 is provided on the cylinder. This reference surface 4 is used to align with the top of the clamping screw 3 during installation. The plane of the reference surface 4 is pressed tightly against the end of the clamping screw 3 located on the head 2, and the planes completely overlap. Because the reference surface 4 and the cutting end of the head 2 are at an angle β, when the planes completely overlap, the angle of the thread milling cutter head 2 is consistent with the β angle of the milling machine. The outer circumference of the cylinder is tightly fitted against the inner wall of the groove. The other end of the head 2 is the cutting surface. A reference surface 4 is provided on the outer circumference of one end of the cutter head 2 located in the groove. The reference surface 4 is set at an angle β with the cutting end of the cutter head 2. During the design and machining of the cutter head 2, the angle of the machining end of the cutter head 2 is designed to be 45°-70° with the reference surface 4, which is consistent with the β angle of the milling machine. This ensures that the installation angle of the cutter head 2 is consistent with the designed transverse rib machining parameter β angle, and the machined transverse rib is consistent with the designed α angle. The β angle is consistent with the β angle of the thread milling machine, which is 45°-70°. A mounting hole is vertically opened at one end of the cylindrical groove. The mounting hole is coaxial with the cutter shank 1, and the cut-off end of the mounting hole is flush with the cut-off end of the cutter shank 1. A clamping set screw 3 is provided in the mounting hole. The main function of the clamping set screw 3 is to hold the cutter head 2... The clamping screw 3 is fixed in the groove of the tool holder 1 to ensure that the tool head 2 will not loosen or shift during operation. The top of the clamping screw 3 is in contact with the reference surface 4 of the tool head 2 to clamp the tool head 2 and maintain its stability. The end of the clamping screw 3 away from the tool head 2 has an external thread groove, and the mounting hole has an internal thread groove. The clamping screw 3 is screwed into the tool holder 1. The clamping screw 3 is in sliding fit with the tool holder 1, so that the tool head 2 can be precisely fixed by rotating the clamping screw 3. The design of the external and internal thread grooves ensures that the connection between the clamping screw 3 and the tool holder 1 is reliable and can withstand the stress during operation. The clamping screw 3 is in sliding fit with the tool holder 1, and the clamping screw 3 passes through the mounting hole, with its top end abutting and in contact with the reference surface 4.

[0020] The end of the clamping screw 3 furthest from the cutter head 2 has an internal hexagonal groove for screwing in. The internal hexagonal groove is used to cooperate with a hexagonal bolt. First, the cutter head 2 is inserted into the cutter shank 1. After the clamping screw 3 is inserted, the clamping screw 3 is screwed in by the hexagonal bolt, allowing the clamping screw 3 to continue sliding. The end of the clamping screw 3 near the cutter head 2 abuts against and is completely in contact with the plane on the reference surface 4 on the cutter head 2. At this time, the installation of the cutter head 2 is completed. Through the precise installation of the cutter head 2, the installation angle of the cutter head 2 can be made consistent with the design transverse rib processing parameter β angle. The processed transverse rib is consistent with the design α angle and symmetrical, which meets the requirements of cold bending performance when rolling threaded steel and anchor rod steel bars, and solves the problem of cracking caused by stress concentration at the root of the transverse rib.

[0021] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A self-positioning device for the thread milling cutter head of a finished threaded steel bar rolling mill, characterized in that: The tool includes a tool holder (1), a tool head (2), and a clamping screw (3). A cylindrical groove is vertically opened on the tool holder (1), and a tool head (2) is provided in the groove. One end of the tool head (2) is cylindrical, and the outer circumference of the cylindrical part is tightly fitted to the inner wall of the groove. The other end of the tool head (2) is a cutting surface. A reference surface (4) is opened on the outer circumference of the end of the tool head (2) in the groove. The reference surface (4) is set at an angle β with the cutting end of the tool head (2). A mounting hole is vertically opened at one end of the cylindrical groove. The mounting hole is coaxial with the tool holder (1), and the end of the mounting hole is flush with the end of the tool holder (1). A clamping screw (3) is provided in the mounting hole, and the clamping screw (3) is slidably fitted to the tool holder (1). The clamping screw (3) passes through the mounting hole, and its top end abuts against the reference surface (4).

2. The self-positioning device for the thread milling cutter head of a finished threaded steel bar rolling mill according to claim 1, characterized in that: The β angle is consistent with the β angle of the thread milling machine, which is 45°-70°.

3. The self-positioning device for the thread milling cutter head of a finished threaded steel bar rolling mill according to claim 1, characterized in that: The clamping screw (3) has an external thread groove at one end away from the cutter head (2), and an internal thread groove in the mounting hole. The clamping screw (3) is screwed onto the cutter bar (1).

4. The self-positioning device for the thread milling cutter head of a finished threaded steel bar rolling mill according to claim 3, characterized in that: The end of the clamping set screw (3) away from the cutter head (2) has an internal hexagonal groove for screwing the clamping set screw (3).

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