JPH07116900A - Device for pressing heat treated and surface treated steel plate - Google Patents

Abstract

PURPOSE:To simultaneously execute heat treatment and surface treatment when a steel plate is pressed by applying a surface treating agent to the surface of the steel plate to be surface treated using an applying means, pressing the steel plate and quenching the steel plate by controlling the temperature using a controlling means for the temperature of heat treated surface. CONSTITUTION:The steel plate is heated to the quenching temperature by a heater and the surface treating agent is ejected to the pressed surfaces of upper and lower dies 15 and 12 by a surface treating agent ejecting device 20. The heated steel plate is positioned to be abutted on upper and lower dies 15 and 12 whose specific temperature is maintained and a pressing device 10 is driven. The surface treating agent applied to the pressed surfaces of upper and lower dies 15 and 12 is allowed to react by the heat of steel plate and stuck to the surface of steel plate. Meanwhile, the steel plate is quenched by controlling the temperature of pressed surfaces by a temperature adjusting device for controlling water 30. Thus, man-hours are saved since the heat treatment and surface treatment are simultaneously executed when the steel plate is pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel sheet press working apparatus for heat treatment and surface treatment.

[0002]

2. Description of the Related Art In various parts made of steel plate, some parts of the parts require high hardness in view of strength, wear resistance, etc., while other parts mainly have toughness, depending on the usage form. In many cases, low hardness is required in terms of workability. As a method for manufacturing such a steel sheet partially different in hardness, heat treatment methods such as flame quenching and induction quenching are known. Surface treatment such as rust prevention and plating is generally carried out by immersing a pressed steel sheet in an electrolytic solution and passing a current through the electrolytic solution to cause a scientific reaction.

On the other hand, in the technique disclosed in Japanese Patent Laid-Open No. 53-19115, cooling water is passed through a mold to form portions having different cooling rates, and the temperature can be raised to the quenching temperature. By providing the steel plate with a portion that can be rapidly cooled, press working is performed while forming portions having different hardness on the steel plate.

[0004]

In the above-mentioned conventional technique, press molding and heat treatment are performed at the same time,
We are working to reduce man-hours. On the other hand, in order to perform the surface treatment, the steel sheet after press forming has to be immersed in the electrolytic solution to perform rust prevention and plating treatment as described above, so two-step work must be performed. Without man-hours.

The present invention has a technical problem of performing heat treatment and surface treatment in one press molding.

[0006]

In order to solve the above-mentioned technical problems, the technical means taken in the present invention is that a heat-treated surface formed so as to come into contact with the whole or part of a steel sheet heated to a quenching temperature. A die provided, a heat treatment surface temperature control means for controlling the temperature of the heat treatment surface, and a coating means for applying a surface treatment agent to the surface treatment surface that abuts the entire surface or a part of the steel sheet when performing surface treatment on the steel sheet. Is.

[0007]

The function of the present invention will be described. A surface treatment agent is applied to the entire surface of the steel sheet or a surface-treated surface that comes into partial contact with the application means, and the steel sheet heated to the quenching temperature is press-formed. As a result, the surface treatment agent applied to the surface-treated surface causes a chemical reaction by the heat of the steel sheet, and is transferred from the surface-treated surface to the surface of the steel sheet. On the other hand, the temperature of the heat-treated surface can be controlled by the heat-treated surface temperature control means to subject the so-called portion of the steel sheet to quenching to partially change the hardness of the steel sheet. As described above, the heat treatment and the surface treatment can be performed at the same time when the press molding is performed, which leads to a reduction in the number of steps.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the steel plate press working apparatus for heat treatment and surface treatment according to the present embodiment includes a press working apparatus 10, a surface treatment agent injection device 20, and a control water temperature adjusting device 3.
It consists of zero. The press working apparatus 10 includes a lower die 12 held by a bed 11 and a guide 1 by hydraulic pressure.
Upper mold 1 held by a movable member 14 that slides 3 up and down
5 and 5. The upper and lower molds 15 and 12 are provided with pressure-receiving surfaces 15b and 12b that also serve as heat-treated surfaces and surface-treated surfaces, and the steel plate 40 (FIG. 3) has the pressure-receiving surfaces 15b and 15b.
It is sandwiched by 12b with a predetermined pressure, and molded into an arbitrary shape. Further, as shown in FIG. 2, each of the upper and lower molds 15 and 12 has an internal space 1 filled with control water.
5a and 12a are formed. These internal spaces 15
Each of a and 12a communicates with a control water tank 33 of the control water temperature adjusting device 30 via an inflow pipe 31 and an outflow pipe 32. In the control water tank 33, the control water is adjusted to an arbitrary temperature by the cooler 34 and the heater 35, and this control water is sent to the internal spaces 15a, 12a of the mold by the pump 36, and the upper and lower molds 15, The temperature of 12 is adjusted. On the other hand, the surface treatment agent injection device 20 includes the injection nozzle 2
1, the spray nozzle 21 is movable in the horizontal direction with respect to the ground, and sprays the surface treatment agent toward the upper side and the lower side.

Next, the operation of this embodiment will be described with reference to FIG.

First, the steel plate 40 is heated to the quenching temperature by the heater 50 in the steel plate heating step (800 degrees in this embodiment). Next, in the surface treatment agent applying step, the surface treatment agent injection device 20 injects the surface treatment agent toward the pressure receiving surfaces 15b and 12b of the mold. As the surface treatment agent, for example, a rust preventive agent, zinc powder or the like is used. Then, the steel plate 4 heated in the steel plate heating step
0 is the upper and lower molds 1 kept at a predetermined temperature with control water
The press working device 10 is driven at a position where the press working device 5 and 12 come into contact with each other. At this time, in the present embodiment, the temperature of the upper and lower molds 15 and 12 for quenching the steel plate 40 is indicated by a line (FIG. 4) showing the relationship between the time and the temperature of the steel plate 40 after the start of pressing. It must have a slope that intersects the t-section of the site (Ms) curve (Figure 4). The temperature of the control water is adjusted so that the steel plate 40 exhibits this inclination. On the other hand, the pressure receiving surfaces 15b, 1 of the upper and lower molds 15, 12
The surface treatment agent on 2b is placed at the position indicated by A in FIG.
The heat of the steel plate 40 causes a chemical reaction and the steel plate 40
Attached to the surface of. In addition, in part B of FIG.
0 press working is performed.

In this embodiment, the surface treatment agent injection device 20 applies a surface treatment agent to the pressure receiving surfaces 15b and 12b, and press-molds a steel sheet heated to the quenching temperature. As a result, the surface treatment agent causes a chemical reaction by the heat of the steel sheet during press working, and the steel sheet 40 is pressed from the pressure receiving surfaces 15b and 12b.
Is transferred to the surface of. On the other hand, the temperature of the pressure receiving surfaces 15b and 12b is controlled by the control water temperature adjusting device 30, so that the steel plate 40 is quenched. As described above, the heat treatment and the surface treatment can be performed simultaneously with the press molding, and the number of steps can be reduced.

In this embodiment, the pressure receiving surfaces 15b and 12b are used.
Although the whole is treated as a heat-treated surface and a surface-treated surface, the pressure-receiving surfaces 15b and 12b are partially heat-treated and surface-treated so that the hardness of the steel plate 40 is partially changed or surface-treated. You can

[0014]

The effects of the present invention will be described. A surface treatment agent is applied to the entire surface of the steel sheet or a surface-treated surface that comes into partial contact with the application means, and the steel sheet heated to the quenching temperature is press-formed. As a result, the surface treatment agent applied to the surface-treated surface causes a chemical reaction by the heat of the steel sheet, and is transferred from the surface-treated surface to the surface of the steel sheet. On the other hand, the temperature of the heat-treated surface can be controlled by the heat-treated surface temperature control means to subject the so-called portion of the steel sheet to quenching to partially change the hardness of the steel sheet. As described above, the heat treatment and the surface treatment can be performed simultaneously with the press molding, and the number of steps can be reduced.

[Brief description of drawings]

FIG. 1 shows a model view of a steel plate press working apparatus for heat treatment and surface treatment according to the present invention.

FIG. 2 shows an enlarged view of a press machine of a steel plate press machine for heat treatment and surface treatment according to the present invention.

FIG. 3 is a diagram showing a process of a steel plate press working apparatus for heat treatment and surface treatment according to the present invention.

FIG. 4 shows an isothermal transformation curve of steel.

[Explanation of symbols]

 10 ... Pressing machine 12 ... Lower mold 15 ... Upper mold 20 ... Surface treatment agent injection device 30 ... Control water temperature adjusting device 33 ... Control water tank 34 ... Cooler 35 ... Heater 36 ... Pump

Claims (1)

[Claims] 1. A mold having a heat treatment surface formed so as to abut all or part of a steel sheet heated to a quenching temperature, heat treatment surface temperature control means for controlling the temperature of the heat treatment surface, and a surface of the steel sheet. A press working apparatus for a steel sheet for heat treatment and surface treatment, comprising a coating means for coating a surface treatment agent on a surface treatment surface which abuts the entire surface or a part of the steel sheet in performing the treatment.