CN101209478A - A non-isothermal stamping forming device for sheet metal - Google Patents

Abstract

The invention belongs to the field of mechanical engineering, and specifically relates to a plate non-isothermal forming die device, which is mainly used for non-isothermal stamping and forming of plate parts. The material may include magnesium alloy, aluminum alloy, titanium alloy and other metal materials that are difficult to form at normal temperature. The plate non-isothermal stamping forming device has a punch, a die, a blank holder, a constant temperature circulation system arranged inside the punch, a heating system arranged on the top of the blank holder, and a cooling system arranged at the bottom of the die. The present invention heats the blankholder and cools the lower surface of the die with circulating liquid to ensure that a temperature gradient is formed in the blankholder, the blank and the die after the blank is put in and closed. Keep the temperature low at the fillet of the die. The low temperature at the rounded corner of the die can effectively avoid the fracture of the deformed blank due to insufficient strength caused by excessive temperature, and effectively improve the forming performance of the sheet. The use of constant temperature circulating liquid in the punch is conducive to maintaining the stability of the forming process conditions.

Description

A non-isothermal stamping forming device for sheet metal

technical field

The invention belongs to the field of mechanical engineering, and specifically relates to a plate non-isothermal forming die device, which is mainly used for non-isothermal stamping and forming of plate parts. The material may include magnesium alloy, aluminum alloy, titanium alloy and other metal materials that are difficult to form at normal temperature.

Background technique

The stamping forming of plate parts is to use the punch, die and blank holder to deform the sheet into the required shape and size. This forming process has been widely used in industrial production because of its high productivity, low cost and excellent product quality. However, at present, a large number of stamping production activities are carried out at room temperature. For some high specific strength materials that have attracted increasing attention due to environmental protection and energy saving, such as magnesium alloys, aluminum alloys and titanium alloys, due to their poor plasticity at room temperature, The industrial application of these materials as stamped products is severely limited. Extensive experiments have demonstrated that these materials exhibit significantly enhanced plastic deformation capabilities under heated conditions. Therefore, the warm or hot stamping forming process that can effectively improve the formability of these difficult-to-form materials at room temperature is bound to be widely used.

Previous warm or hot stamping devices can be divided into isothermal stamping and non-isothermal stamping. A large number of experiments and theories have proved that non-isothermal stamping can effectively improve the forming ability of materials. However, the non-isothermal stamping devices reported in the literature all use heating elements to heat the die and blankholder at the same time, and some use water or other liquids to cool the punch at the same time. This kind of stamping forming device can effectively form a temperature field that is beneficial to stamping forming inside the blank. However, due to the heat conduction of the rounded corner of the die with a high temperature to the nearby deformed part, this part of the blank has an excessively high temperature. The low strength exhibited at excessively high temperatures significantly increases its likelihood of fracture.

In order to further improve the deformation ability of difficult-to-form materials at normal temperature in non-isothermal stamping forming, the present invention proposes an improved non-isothermal stamping forming device.

Contents of the invention

The object of the present invention is to provide a sheet material non-isothermal stamping forming device, through the improvement of the traditional non-isothermal stamping die device, the deformation ability of difficult-to-form materials at room temperature in non-isothermal stamping is further improved.

Technical scheme of the present invention is:

A non-isothermal stamping forming device for sheet materials, which has a punch, a die, and a blank holder. The blank corresponding to the punching direction of the punch is placed between the die and the blank holder. A heating system is installed on the top of the blank holder, and the bottom of the die Set up cooling system.

The heating system is a heating plate with built-in heating coils or other heating elements.

The cooling system is a cooling plate with built-in circulating liquid.

In the sheet material non-isothermal stamping forming device, the punch fixed on the punch seat and the punch seat have a built-in constant temperature liquid circulation system.

The constant temperature circulation system placed in the punch and the punch seat is composed of circulating liquid, the input end of the circulating liquid arranged on the punch seat or the punch, the output end of the circulating liquid arranged on the punch or the punch seat, and the Consists of the punch and the guide tube of the punch seat.

The sheet material non-isothermal stamping forming device is also equipped with a thermocouple for testing the temperature of the blank holder and the die, and a controller for adjusting the power of the heating system.

A typical stamping die set consists of a punch, a die and a blank holder. For some materials that are difficult to form at room temperature, such as magnesium alloy and some aluminum alloys, in order to improve the formability of the plate, the stamping die also needs a matching heating and cooling device. The non-isothermal stamping forming die device of the present invention only heats the blank holder, and the suitable part of the die is cooled by circulating liquid, so as to ensure that the temperature gradient is formed in the blank holder, the blank and the die soon after the blank is put into the mold. , to ensure that the flange part of the blank to be deformed has a sufficiently high temperature, and at the same time, the low die temperature, especially the low temperature at the fillet of the die, can effectively avoid the fracture of the deformed billet due to insufficient strength caused by excessive temperature , A constant temperature circulating liquid is used in the punch to ensure that the punch maintains a relatively stable temperature during the forming process. Through this method of heating the blank holder, cooling the lower surface of the concave die with a circulating liquid, and using a constant temperature circulating liquid in the punch, stable forming process conditions can be obtained, and the forming performance of the sheet can be improved at the same time.

Advantage of the present invention is as follows:

1. Compared with the existing non-isothermal stamping forming device, the present invention only heats the blank holder, and at the same time, uses circulating liquid to cool the suitable part of the die, so as to ensure that after the blank is put in, the blank holder and the die are closed , and quickly form a reasonable temperature gradient in the blank holder, the blank and the die, which not only ensures the high temperature of the flange part of the blank to be deformed, but also has a low temperature at the fillet of the die, avoiding the concave The deformed part of the blank near the rounded corner of the die is broken due to the excessive temperature of the die.

2. The constant temperature liquid circulation system inside the punch of the present invention ensures that the punch maintains a constant temperature during the forming process, which is conducive to formulating stable forming process parameters.

3. The present invention saves the required energy because only the blankholder is heated.

Description of drawings

Figure 1 is a schematic diagram of the structure of a non-isothermal stamping forming device. In the figure, 1-lower workbench, 2-lower template, 3-insulation plate (I), 4-cooling plate, 5-die, 6-binder ring, 7-heating plate, 8-insulation plate (II) , 9-upper template, 10-beam, 11-insulation board (III), 12-punch seat, 13-punch, 14-drain tube, 15-heating coil, 16-thermocouple, 17-blank, 18 - guide post, 19 - circulating liquid, A - input end of circulating liquid of punch, B - output end of circulating liquid of punch, C - input end of circulating liquid of die, D - output end of circulating liquid of die.

Detailed ways

As shown in FIG. 1 , the plate non-isothermal stamping forming device (mold) of the present invention is mainly composed of a punch 13, a die 5, a blank holder 6, and a heating and cooling system. The non-isothermal stamping die is installed on a double-action or triple-action press, and an insulating plate is used to avoid heat conduction between the die and the press. The blank holder 6, the heating plate 7 (built-in heating coil 15) and the heat insulating plate (II) 8 are fixed on the upper template 9 from bottom to top, and the upper template 9 can move vertically along the guide pillar 18; the die 5 , cooling plate 4 (built-in circulating liquid 19, such as: cooling water or other liquids) and insulation plate (I) 3 are fixed on the lower template 2 from bottom to top, and lower template 2 is fixed on the lower workbench 1 of the press; The mold 13 is fixed on the punch base 12, and the punch 13 and the punch base 12 are built into the guide tube 14 to ensure that the circulating liquid 19 is fully in contact with the punch 13, and they are fixed together with the heat insulating plate (III) 11 on the bottom of the press. On the beam 10 , the beam 10 can move vertically along the guide post 18 .

The blankholder 6 is heated by a heating device (heating plate 7), and the circulating liquid 19 in the cooling plate 4 enters from the input end C of the circulating liquid of the die and flows out from the output end D of the circulating liquid of the die through the circulating liquid 19 in the cooling plate 4. Perform circulation cooling, put the blank 17 between the blank holder 6 and the die 5, and then form a suitable temperature gradient in the blank holder 6, the blank 17 and the die 5. In addition, the liquid constant temperature circulation system inserted into the punch 13 and the punch seat 12 enters through the circulating liquid 19 from the punch circulation liquid input port A opened on the punch seat 12, and passes through the punch 13 and the punch seat 12. The guide pipe 14 flows out to the output port B of the punch circulating liquid to ensure that the punch 13 has a relatively stable temperature. The thermocouple 16 is used to test the temperature of the blank holder 6 and the die 5, and a controller is used to adjust the power of the heating coil so that the binder ring 6 and the die 5 maintain a relatively stable temperature.

Heating coil 15 is used to heat blankholder 6 to a suitable temperature before forming starts, and at the same time, circulating liquid 19 of constant temperature is passed into cooling plate 4 under die 5, and circulating liquid of constant temperature is also passed into punch 13 , when the thermocouple 16 in the blank holder ring 6 and the die 5 shows the required temperature, place the blank 17 on the upper surface of the die 5, clamp the blank holder ring 6 with the die 5 and apply a reasonable blank holder force , and then the punch moves downward to deform the blank to the required shape.

Claims (6)

1. sheet material non-isothermal punching forming device, have punch (13), die (5), blank holder (6), the blank corresponding with punch (13) pressing direction places between die (5), the blank holder (6), it is characterized in that: blank holder (6) top is provided with heating system, and die (5) bottom is provided with cooling system.

2. according to the described sheet material non-isothermal punching forming device of claim 1, it is characterized in that: described heating system is the heating plate of built-in heater coil or other heating element heater.

3. according to the described sheet material non-isothermal punching forming device of claim 1, it is characterized in that: described cooling system is the coldplate of built-in circulating fluid.

4. according to the described sheet material non-isothermal punching forming device of claim 1, it is characterized in that: be fixed on the punch (13) and the built-in isothermal liquid circulatory system of convex mould base (12) on the convex mould base (12).

5. according to the described sheet material non-isothermal punching forming device of claim 4, it is characterized in that: described place in punch and the convex mould base the constant temperature circulatory system by circulating fluid, be located at convex mould base or punch the circulating fluid input, be located at the circulating fluid output of punch or convex mould base and be arranged in punch and the mozzle of convex mould base constitutes.

6. according to the described sheet material non-isothermal punching forming device of claim 1, it is characterized in that: also be provided with the thermocouple that is used to test blank holder and die temperature, and the controller that is used to regulate heating system power.

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