The method of tapping on the corrugated rod

 

(57) Abstract:

The invention relates to the processing of metals by pressure, in particular to the process of tapping on the corrugated core. According to the method of tapping on the corrugated rod thread runs on one end. However before landing in a hot condition of the threaded end of the rod so that the cross-sectional area formed by the thread was at least equal to the cross-sectional area of the remaining part of the rod, remove the ribs and channels of the rod. The end of the rod is subjected to controlled heat, since heat from the beginning free from riffles parts and raising the temperature in the direction of the other end is free from riffles part. The fluted core sandwiched motionless, pressed into the movable cylindrical mold. The carving is done on the planted part of the formation. 1 C.p. f-crystals, 3 ill.

The invention relates to a process of tapping on the corrugated core.

Corrugated rod used as a procurement method which is the subject of the present invention, is made from a round profile using a special method of molding, which receive the ribs of the corrugated core is given the strength of corrugated rod while increasing the hardness of the ribs, which are made of a much harder material.

Conventional threaded nuts on the corrugated core is performed using known methods, including or rolling or cutting. In these cases, the cross-section of the rod is reduced in the threaded part, and the strength of the rod to break completely determined by the cross sectional area of the thread. The decrease in the tensile strength of the rod is about 20 to 30% Thus, the tensile strength of the threaded rod is determined solely by the cross-sectional area of the thread, leaving the strength of the rest of the rod unused, which means inefficient use of steel. The economic challenge is tapping, whose cross section in the zone of tension greater than or equal to the nominal cross-section of the grooved rod.

Patented several ways to get the thread with the full tensile strength of the corrugated core. All of them are based on the application of the method of cold flatten the end of the corrugated core at room temperature. So, for example, patent application UK 2227802 provides as a reinforcement for reinforced concrete to use the connection rods to the ends fulfill tapered thread. In the patent Finland 890509 offer a way of mechanical connection of round bars with threaded bushings installed on the joints. According to this proposal, one of the two adjacent ends of the rods before tapping flat in a cold state. Flattening is performed along the length of the threaded section so that the base diameter of the threaded area at least equal to or greater than the normal diameter of the connected terminals.

Cold flattening does not entail any changes in material or strength properties of corrugated rods. After cold flatten the thread on the flattened segment is applied through cutting. This method allows you to retain mechanical properties of steel bars, but at the same time remove material from the surface of the rod. In the method of cold flatten the end of a corrugated rod can be increased only at a short interval, since the structure of the steel well enough resists cold flattening to cut into the corrugated rod threaded at greater length than is required for the nuts. For connections that require a long thread, way cool flatten not pickup the giving of such a way of carving performance on the grooved rod which preserves the increased strength of steel produced in the manufacturing process of corrugated core and surface hardness of steel and its internal viscosity even in the process of threading, allowing you to get on the corrugated core thread with the full tensile strength.

In the method, subject of the present invention, the end of a corrugated rod obtochuyut, removing ribs and the lateral grooves of the rod, then the end of the rod is heated and subjected to hot-flattening, thereby increasing the area of its cross section. After the hot flatten the end of a corrugated core is cooled. The threads on the end of the rod do the rolling. The features of the process which is the subject of the present invention, presented in the claims.

This method allows you to get a thread with perceiving stress rupture Poperechnaya cross-section, equal to or greater than its net square cross section solid knurled rod that is decisive in relation to the nominal characteristics of the bolts. In addition, regardless of the diameter knurled rod, rezinovy plot can have the desired length depending on the purposes for which it is designed is Astok, and the way you can get a thread of any desired length. Thus, fluted threaded rod can be used in such applications that require thread longer than the height of the nut, or, in other words, the thread may be sufficient in length to produce the required regulation. Such applications include, for example, anchor bolting in the columns.

In Fig. 1,shows a corrugated rod; Fig. 1,b is the same, with the processed end; Fig. 2 the process of hot flatten; Fig. 3,and the end of the rod after hot flatten; Fig. 3,b corrugated threaded rod.

According to the method of obtaining a full-sized thread the end of a corrugated rod first obtochuyut on a lathe to remove the ribs 1 and the lateral grooves 2 (Fig. 1,a) on a segment of the rod 3, which is scheduled to put the thread (Fig. 1,b). This removes most of the solid portion of the corrugated core. In the production process of corrugated core material of the ribs is exposed to the greatest change. In the method, subject of the present invention, with the grooved rod is removed the zone of maximum hardness of material, which serve as a hindrance for hot flatten, try a controlled manner, in order to achieve a smooth transition temperature in the treated area 3 between the end of the rod 4 and early 5 corrugated part, with the highest temperature observed at the end of 4 fluted rod, gradually decreasing in the direction of the other end 5 of the treated area. The temperature of the raw part 6 corrugated rod does not increase, excluding the heat transfer from the heated part 5.

Heated grooved rod 7 (Fig. 2) is clamped by the hydraulic press 8 so that he could not move. Other hydraulic pressure 9 end 11 of the rod pressed against the closed cylindrical mold so that the end 11 of the corrugated core is subjected to hot-flattening, the area of its cross section increases and becomes equal to the inner diameter of the cylindrical mold 10 of the press.

The end 7 of the corrugated rod expands to such an extent that the cross-sectional area of the thread 15 formed on it, was at least equal to the cross-sectional area of the remaining part of the rod 7, so the strength of the core gap persists even fully threaded on the site.

The pressing force is applied to the end 11 of the rod in the direction of the clamping press 8 and is large enough the temperature distribution in the machined part of the rod is to provide an initial demonstration of the effect of hot flatten on the end 11 of the rod and, as more pressing, distribution of this effect in the direction of the other end 12 of the processed part. With a smooth change of temperature can provide continuous control over the distribution zone flattening rod, eliminating the probability of the initial manifestations of the effect of flattening in the middle of the treated area. In addition, temperature increases in the direction of the end 11 of the rod ensures that subjected to flattening land pogatsa before the effect of flattening will not appear in the most hot spot 11. The molding process is stopped only after the processed portion 13 expands, fills the mold 10.

Flattened end 14 of the rod (Fig. 3,a) after hot flatten subjected to controlled cooling so that the cooling process could be saved initial strength characteristics of the corrugated core.

To obtain the full thread applies known in the art a method of threading, in which the cylindrical portion 14 formed on the rod by hot flatten, amrabat the La.

In the process of rolling on the surface of the rod is formed thread, and rolling also has a hardening effect on the material, as steel 17 in the process of rolling is subjected to forming in a cold state, which increases its strength and hardness. The effect of hardening by cold working does not reach the inner part 18 of the rod, so that the material inside the rod remains viscous, and the viscosities of the entire threaded area is preserved.

Rolling to form a thread starts only after cooling of the end of the grooved rod to room temperature. The threads perform throughout flattened portion 14 of the corrugated core. Then the rod is not subjected to machining.

Using the rolling method allows you to restore the original hardness of the material on the threaded section, lost in the heating process. In addition, the rolling causes the tilt of the stem material on the threaded area, helping to restore the initial hardness of the surface of the corrugated core in this part. The effect of hardening by cold working does not reach the inner part of the rod and therefore satisfactory show to be obvious, different variants of implementation of the present invention is not limited to the example described above and can be modified within the scope of this invention defined by the following claims.

1. The method of tapping on the corrugated rod used in the joints of concrete reinforcement, such as connections, anchor bolts, wherein prior to planting in the hot condition of the threaded end of a corrugated rod so that the cross-sectional area formed by the thread was at least equal to the cross-sectional area of the remaining part of the rod, remove the ribs and grooves of the rod, characterized in that the end of the grooved rod is subjected to controlled heat, since heat from the beginning free from riffles parts and raising the temperature in the direction of the other end is free from the riffles of the rod, fluted core sandwiched nepodvizhno, pressed into the movable cylindrical mold, and the temperature difference between different parts of the rod causes a landing on the most hot end of the rod and its dissemination to the field of decreasing temperature.

2. The method according to p. 1, characterized in that the threads execute on raspushennoy part of negative the

 

Same patents:

Reinforcing rope // 2075578
The invention relates to reinforcing the packets that are destined for reinforcement of prestressed concrete structures, and can improve the degree of adhesion with the concrete

The invention relates to reinforcing elements for concrete structures reinforcement

The invention relates to the field of building materials, namely, the reinforcing elements of reinforced concrete structures

Rebar // 2021440
The invention relates to the field of construction and can be used in reinforced concrete structures

Reinforcing element // 2020225
The invention relates to the construction and can be used for reinforcement of concrete structures

The invention relates to the manufacture of building products, namely for reinforcement of prestressed concrete structures

Reinforcing rope // 2020223
The invention relates to the manufacture of building products, namely for reinforcement of prestressed concrete structures

The invention relates to the processing of metals by pressure, retinoblastoma tool and can be used when forming the threads knurling on the core products of the type of screws and screws

The invention relates to the processing of metals by pressure, retinoblastoma tool and can be used when forming the threads knurling on the core products of the type of screws and screws

Tap forming // 2009750

The invention relates to the processing of metals by pressure and can be used for stamping rod parts with a massive head with a cavity, for example, details of the type of cutter

The invention relates to a punching tool with detachable matrices and can be used for stamping the core products of the type of nails

The invention relates to the processing of metals by pressure and can be used in the manufacture of cold-formed tool, in particular for precipitation of a large amount of heads parts rod type

The invention relates to the field of metal forming, in particular for landing in split matrices, and is used primarily in medical technology, namely in the operations of osteosynthesis in the treatment of fractures of tubular bones

The invention relates to the field of metal forming and, in particular, to a device for cold plastic deformation and details with regulated phenomenological combination of performance and can be used in the manufacture of:

a new generation of sensors for measuring physical parameters in chemically active environments, ultra-small and ultra-high pressures, while vibrodiagnostic with changing amplitude, high and cryogenic temperatures;

a new generation of the defining parts of video and audio equipment (switches-magnetically operated contacts) that allows you to create on the basis of one element mutually exclusive physical features: high elasticity and corrosion resistance high magnetic induction Bsstable maximum magnetic permeabilitymax;

a new generation of environmentally friendly magnetic modules in food containers for catalyzing the formation of amino acids during fermentation of protein masses;

a new generation of long-term self-healing blood analyzers to AIDS, allowing fast enough to visually appreciate the fact neobhodimosti constant stirring with the aim of preserving one part

The invention relates to the processing of metals by pressure and can be used for punching round steel rod with flange, for example, axes hire

The invention relates to mechanical engineering technology, namely the restoration of worn in diameter parts, such as cylindrical pins for pattern plates, and can be used in shipbuilding, construction, automotive and other sectors of the economy in order to restore the various parts manual
Up!