TW201338891A - Straightening-free rod thermal treatment method and device thereof - Google Patents

Abstract

This invention discloses a straightening-free rod thermal treatment method and a device thereof and more particularly relates to an innovative design capable of greatly reducing the labor and time costs required by the follow-up straightening. With the innovative design, this invention makes use of an ABCD guide wheel set and an idler to clamp and rotate a workpiece, prevent workpiece deformation and move the workpiece forwards during the process of high frequency quenching thermal treatment. The workpiece treated by this mechanism can have a straightness of 0.1 mm, which is greatly improved from 2 to 3 mm in traditional processes, meeting the JIS shape straightening deformation standard of cold drawn rod steel and hot rolled rod steel, thereby eliminating the need of a straightening process. The straightening-free rod thermal treatment method and the device thereof can solve the problem associated with deformation caused by the stress release during the quenching thermal treatment and eliminate the post-thermal treatment straightening operation, so as to save the labor and time costs.

Description

Straightening bar heat treatment method and device thereof

The invention relates to a heat treatment method and device for the straightening-free bar, in particular to an innovative designer who can greatly save the cost of subsequent straightening manpower.

Press, Heat Treatment has long been used in industry, and it is a treatment method that changes the properties of materials by thermal changes (including heating and cooling). Changes in material properties include strengthening, softening, or treatment with special physical properties. While heat treatment techniques are used to change material properties, most of them are metallic materials. Heat treatment is a key technology in the processing of metal materials. Heat treatment is one of the important means to obtain the final properties of metal parts or tools. Before designing, selecting materials, forming, and machining, the metal profiles must be heat treated or surface treated to enhance the performance of the materials.

Please refer to the first figure, which is a schematic diagram of the normal press straightening method. The straightening of the press is the simplest straightening method. The principle is the same as the three-point bending. The material is mainly placed in the same plane. On the bearing (support point), the punch is set according to the deformation distribution of the material, and the appropriate fulcrum span and the material straightening and pressing position are set, and the appropriate amount of the material is applied to the material in the span of the two fulcrums, so that the punching point is enabled at the fulcrum point. The material between them achieves the effect of bending and straightening.

However, almost all materials have a certain modulus of elasticity. When the material is bent and formed, the material must first undergo elastic deformation, and then plastic deformation occurs. Therefore, the deformation during forming can be divided into elastic deformation and Plastic deformation two parts. When the mold is retracted to the preparation position during the bending forming process, the amount of elastic deformation is restored and disappears, leaving only the portion of the plastic deformation amount, which is called spring back. However, the press straightening method uses the same principle as the three-point bending to straighten the material bending, so there is a tendency to rebound. Therefore, when using a press to bend and straighten the material, it must also be considered. Rebound and correct it.

Therefore, in view of the problems existing in the straightening operations required for the above-mentioned conventional heat treatment, how to develop an innovative technology that can greatly save manpower and time cost, and the consumer is eagerly awaited, and the relevant industry must strive to develop breakthroughs. In view of this, the inventor has been engaged in the manufacturing development and design experience of related products for many years. After detailed design and careful evaluation of the above objectives, the invention has finally become practical.

That is, the main object of the present invention is to provide a heat treatment method and apparatus for the straightening-free bar; the problem to be solved is the wasteful labor time cost for the straightening operation extended by the conventional heat treatment. The problem points are improved and breakthrough; and the technical characteristics of the problem solving are mainly through the process steps including:

A, the workpiece is preheated by the coil;

B. The AB guide wheel set and the idler wheel are clamped and rotated on the workpiece;

C, the workpiece is quenched and heated by the coil;

D. The workpiece passes through the first stage of quenching water cooling ring;

E. clamping and rotating on the workpiece by the CD guide wheel set and the idler;

F. The workpiece passes through the second stage quenching water cooling ring;

G, the workpiece is tempered to heat the coil;

H, the workpiece often warm water cooling ring;

And a straightening bar heat treatment device, wherein the two sets of guide wheel sets are respectively disposed in the heat treatment two-stage quenching process, the guide wheel set comprises: two guide wheels and an idler wheel, and the two guide wheels are tapered The purpose is to provide the workpiece clamping, rotating, preventing the workpiece from deforming and moving the workpiece forward; thereby, the innovative and unique design enables the workpiece to be used in the high-frequency quenching heat treatment process by using the ABCD guide wheel set and the idler. Provide workpiece clamping, rotation, prevent workpiece deformation, and move the workpiece forward. The straightness of the workpiece after heat treatment by this mechanism is greatly increased from 2mm~3mm to 0.1mm in the traditional process, which conforms to the JS cold-drawn bar steel and hot-rolled bar steel shape straightening deformation specification, so the straightening process can be omitted, and the invention is free from straightening. The bar heat treatment method and the device thereof can solve the deformation caused by the stress release of the bar during the quenching heat treatment process, and the straightening operation after the heat treatment is omitted, thereby saving manpower and time cost.

Please refer to FIG. 2, which is a preferred embodiment of the heat treatment method and apparatus for the straightening-free bar of the present invention, but the embodiments are for illustrative purposes only and are not limited by the structure in the patent application; The process steps include:

A, the workpiece (C) is preheated coil (2), the workpiece (C) is placed in the automatic feeding mechanism (A), and the workpiece (C) is pushed to the preheating coil (2) by the push rod to heat the preheating temperature. 260 ° C ~ 300 ° C, the workpiece (C) through the preheating coil (2) and then to the AB guide wheel (31, 32) group;

B. The workpiece (C) is clamped, rotated, prevented from deforming the workpiece (C) by the AB guide wheel (31, 32) group and the idler (33) support frame, and the workpiece (C) is moved to the right. The speed and direction of the two rollers A and B are the same;

C. The workpiece (C) is quenched by the heating coil (4). When the workpiece (C) passes through the AB guide wheel (31, 32) group to the quenching heating coil, its high cycle power is 300kw, the frequency is 10~30KHz, and the heating temperature is about To 850 ° C ~ 920 ° C, the material phase from ferrite (Perrite) and Pearlite (Pearlite) phase change to Austenite (Austenite), to the first stage of quenching water cooling ring (5);

D, the workpiece (C) through the first stage of quenching water cooling ring (5), quenching water cooling ring design length 50mm ~ 100mm, inner diameter Φ 30mm ~ Φ 60mm, through the workpiece (C) travel speed, water pressure (flow), etc. The parameter control makes the material change from the iron phase of Vostian to Martensitic, and the cooling temperature of the workpiece (C) to below about 550 °C to achieve quenching and rapid cooling;

E, then to the CD guide wheel (61, 62) group, the CD guide wheel (61, 62) group is designed the same as the AB guide wheel (31, 32) group, because the rotation speed determines the workpiece (C) travel speed, so CD (61, 62) and AB guide wheel (31, 32) group must be synchronized;

F. When the workpiece (C) passes through the CD guide wheel (61, 62) group, the second stage quenching water cooling ring (7) performs the second stage quenching cooling to lower the workpiece (C) temperature to below the Ms point ( About 150 ° C ~ 250 ° C, depending on the amount of carbon);

G, the workpiece (C) is tempered heating coil (8), and then the tempering process, the tempering temperature is about 160~220 ° C, in order to eliminate the internal stress of the granulated iron, complete the tempering purpose;

H. Finally, a set of normal temperature water cooling ring (9) is passed, so that the workpiece (C) is cooled from the tempered state to the normal temperature, and after the full length of the workpiece (C) passes, the automatic receiving mechanism (B) is completed, that is, a complete process is completed. ;

Then, as shown in FIG. 4, it is a schematic diagram of the heat treatment device for the straightening-free bar of the present invention, wherein the A and B guide wheels (31, 32) and the C and D guide wheels (61, 62) and the bottom end are The idler (33, 63) support plate holds the intermediate workpiece (C) so that the workpiece (C) can be gripped, rotated, prevented from deforming the workpiece (C), and the workpiece (C) is moved forward.

Thereby, the present invention enables the workpiece (C) to use the ABCD guide wheel (31, 32, 61, 62) set and the idler (33, 63) to provide the workpiece (C) clamping and rotating during the high-frequency hardening heat treatment process. Prevent the workpiece (C) from deforming and move the workpiece (C) forward. The straightness of the workpiece (C) after heat treatment by the mechanism is greatly increased from 2mm~3mm to 0.1mm, which conforms to the JS cold-drawn bar steel and hot-rolled bar steel shape straightening deformation specification, so the straightening process can be omitted. The method for heat treatment of the straightening bar and the device thereof can solve the deformation caused by the stress release of the bar during the quenching heat treatment process, and the straightening operation after the heat treatment is omitted, thereby saving manpower and time cost.

The disclosure of the embodiments is intended to be illustrative of the invention, and is not intended to limit the invention. From the above detailed description, it will be apparent to those skilled in the art that the present invention can achieve the foregoing objects and is in accordance with the provisions of the Patent Law.

Conventional part:

(C). . . Workpiece

(D). . . Model

(E). . . Model

(F). . . shower

(G). . . Pressure die

Part of the invention:

(A). . . Automatic feeding mechanism

(B). . . Automatic receiving mechanism

(C). . . Workpiece

(2). . . Preheat coil

(31). . . A guide wheel

(32). . . B guide wheel

(33). . . Idler

(4). . . Quenching heating coil

(5). . . First stage quenching water cooling ring

(61). . . C guide wheel

(62). . . D guide wheel

(63). . . Idler

(7). . . Second stage quenching water cooling ring

(8). . . Tempered heating coil

(9). . . Normal temperature water cooling ring

Figure 1: Schematic diagram of the straightening of the press after the conventional heat treatment.

Fig. 2 is a flow chart showing the heat treatment method of the straightening-free bar of the present invention.

Fig. 3 is a schematic view showing the flow of the heat treatment method for the straightening-free bar of the present invention.

Fig. 4 is a perspective view showing the flow of the heat treatment method for the straightening-free bar of the present invention.

Fig. 5 is a schematic view showing the heat treatment apparatus for the straightening-free bar of the present invention.

Claims (3)

The utility model relates to a heat treatment method for straightening bar-free, the process steps comprising: A, the workpiece is preheated by the coil; B, clamping and rotating on the workpiece by the AB guide wheel set and the idler wheel; C, the workpiece is quenched by the heating coil; D, The workpiece passes through the first stage quenching water cooling ring; E, the CD guide wheel set and the idler wheel are clamped and rotated on the workpiece; F, the workpiece passes through the second stage quenching water cooling ring; G, the workpiece is tempered heating coil; H The workpiece is often heated and cooled by the water ring; thereby, the workpiece can be used to clamp and rotate the workpiece during the high-frequency quenching heat treatment process by using the ABCD guide wheel set and the idler to prevent the workpiece from being deformed and moving the workpiece forward. The straightness of the workpiece after heat treatment by this mechanism is greatly increased from 2mm~3mm to 0.1mm in the traditional process, which conforms to the JS cold-drawn bar steel and hot-rolled bar steel shape straightening deformation specification, so the straightening process can be omitted. An anti-straightening bar heat treatment device, wherein two sets of guide wheel sets are respectively disposed in a heat treatment two-stage quenching process, the guide wheel set comprises: two guide wheels and an idler wheel, and the two guide wheels are tapered The purpose is to provide workpiece clamping, rotation, deformation of the workpiece, and moving the workpiece forward. The straightening-free bar heat treatment device according to claim 1, wherein the idler is provided with a support plate.