JPH11267787A - Halogen lamp heater for forging die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make heat absorption better and thermal efficiency higher by previously applying graphite or black material on a die surface in order to enhance the heat absorptivity thereof at the time of heating the die by the radiation heat of a halogen lamp. SOLUTION: In the case the graphite or the like is applied on the surface of the die 1, a lubricant, such as graphite, contained in a die lubricant container 2 is applied by coating a yarn 3 or brush 4 or by a spray 5 of a graphite liquid. The heating efficiency may be considerably improved by such coating. Further, the halogen lamp which is glassware is liable to be broken. The halogen lamp is slowly brought near to the die vertically or downward by a jack mechanism in order to obviate the same, by which the failure of the glass part is prevented. At the time of heating the die, the fall of the water drops and oil drops from the die is conceivable but a wire net or perforated iron sheet is placed on the upper part to prevent the direct fall thereof onto the glass tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used when a die attached to a forging press is preheated before starting forging.

[0002]

2. Description of the Related Art In order to heat a mold attached to a forging press in advance, propane gas is burned by a burner suitable for the size of the mold and heated by the combustion heat.

[0003]

The work surface of the forging die is shiny with a metal surface, and easily reflects the radiant heat of the halogen lamp and has poor heat absorption. In the case of propane gas heating, as shown in FIG. 1, the heating is performed in an open state in which only the burner 6 is placed between the upper mold 11 and the lower mold 14, which results in poor heating efficiency and flame. There is a disadvantage that the temperature of the mold locally rises too much when the tip of the mold hits the convex part of the mold. Furthermore, forging factories have many fires such as heated materials of forging materials, and there is a risk of explosion due to gas leakage. In some cases, the flame spreads to the lubricating oil of the forging machine, causing a fire. Further, when igniting gas, explosive ignition may occur and burns may occur.

[0004]

In order to solve the problem of propane heating, heating is performed by radiant heat of a halogen lamp. In this case, graphite or a black substance such as a mold lubricant used in forging is applied to the surface of the mold in advance to increase the heat absorption of the mold. Originally, the surface of the mold is finished with fine metal surface roughness, so it easily reflects radiant heat and has poor heat absorption. In order to solve this, a method such as applying graphite such as a mold lubricant to the surface of the mold is used. Thereby, heat absorption is improved and thermal efficiency is extremely improved. Furthermore, the halogen lamp, which is a glass product, has a disadvantage that it is easily broken. In order to solve this problem, the halogen lamp is slowly moved up and down or downward by a jack mechanism to prevent the glass portion from being damaged.
In addition, when the mold is heated, water drops and oil drops may fall from the upper mold, but a wire mesh (or perforated iron plate) is placed on the upper part to prevent the drop from directly falling on the glass tube.

[0005]

According to the present invention, the use of propane gas in a factory using a fire such as a forging factory has a high risk of explosion or fire. The present invention enables clean, safe and efficient heating of the mold.

[0006]

FIG. 2 shows an example of application of graphite or the like to a mold to be heated. When applying graphite or the like to the surface of the mold 1, a lubricant such as graphite contained in a mold lubricant container 2 is applied with a coating thread (or cloth) 3 or a brush 4 or with a graphite liquid spray 5. There is a way. By this coating, the heating efficiency can be extremely improved. Next, an example of mounting the heating device will be described with reference to FIG. The figure is a front view of the forging press. The upper die 11 to be heated is fixed to the ram slide 13 via the upper die holder 12. The lower mold 14 is fixed to a press bed 16 via a lower die holder 15. The upper mold halogen lamp section 18 and the lower mold halogen lamp section 19 are moved between the upper mold 11 and the lower mold 14 and the press inner mold together with the lifting / lowering device section 17. In the illustrated example, a support 20 fixed to the floor, a lever 21 rotatably mounted on the support, and a link 22 rotatable beyond the lever 21,
The movement in the vertical direction is regulated by 23 and 24 so that the halogen lamp does not directly contact the mold and the holder. A method is also conceivable in which the halogen lamp portion and the lifting device are moved between the dies at the center of the press by an oil / pneumatic cylinder or the like from the side or rear side of the press. Next, the lifting device and the halogen lamp will be described with reference to FIG. The halogen lamp 31 and the reflection plate 32 are attached to the upper mold lamp bracket 33, and the moving block 37 of the up-and-down elevating device via two levers 34 and 35 on the left and right sides, respectively.
It is rotatably attached to both ends of the motor. A wire mesh (or perforated iron plate) is stretched over the halogen lamp to prevent water and oil drops from directly falling on the lamp. It is conceivable to use an iron plate or heat-resistant glass to prevent this drop. A halogen lamp and a reflector are attached to the lower mold lamp fitting 39 in a state where the upper mold lamp portion is turned upside down. The lower mold lamp fitting 39 is also attached to both ends of the moving blocks 37 and 38 of the up-and-down elevating device via two levers 40 and 41 on the left and right sides, respectively. The elevating device 36 has a handle 42 that is driven up and down to move up and down, and the entire heater section is connected to a link group that can be rotated by a support bracket 43. Next, the lifting device will be described with reference to FIG. The drive unit is located at the center of the upper and lower ramp units and moves the upper and lower ramp units up and down. A screw rod 52 having a right-hand screw and a left-hand screw is rotatably attached to the outer frame 51, and a handle 53 for rotating the screw rod is provided at the end of the screw rod. Movement blocks 54 and 55 having a right female screw and a left female screw are mounted on the screw rod 52. When the handle 53 is rotated clockwise, the moving blocks 54 and 55 move outward, respectively, and when the handle 53 is rotated left, they move inward. As a result, the upper ramp and the lower ramp attached to both ends of the moving block via the levers simultaneously move up and down toward and away from the mold. Depending on the rotation of the handle, the mold can be slowly approached, and there is no danger of the halogen lamp being damaged by a severe impact. Although the jack mechanism has been described above in which the halogen lamp is slowly approached to the mold, a method of protecting the halogen lamp by slowly approaching it with an air cylinder, a hydraulic cylinder, or the like is also conceivable.

[0007]

[Brief description of the drawings]

FIG. 1 is a front view of a forging press machine when propane gas is heated.

FIG. 2 is an example of application of graphite or the like to a mold.

FIG. 3 is a front view of a forging press showing an example.

FIG. 4 is an embodiment of a halogen lamp section and a lifting device section.

FIG. 5 is an embodiment of a vertical lifting drive unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 mold 2 mold lubricant container 3 coating thread (or cloth) 4 brush 5 spray 6 burner 11 upper mold 12 upper die holder 13 ram slide 14 lower mold 15 lower die holder 16 press bed 17 elevating unit 18 for upper mold Halogen lamp part 19 Lower mold halogen lamp part 20 Prop 21 Lever 22 Link 23 Link 24 Link 30 Wire mesh (or perforated iron plate) 31 Halogen lamp 32 Reflector 33 Upper mold lamp fitting 34 Lever 35 Lever 36 Lifting device 37 moving block 38 moving block 39 lower mold lamp fitting 40 lever 41 lever 42 handle 43 support fitting 51 outer frame 52 screw bar 53 handle 54 moving block 55 moving block

Claims (3)

[Claims] 1. A heating method, wherein when a forging die is heated by a halogen lamp, graphite or a black substance is previously applied to the die surface. 2. A heating apparatus characterized in that a halogen lamp is slowly approached to a mold by a jack mechanism in order to protect a glass tube of the halogen lamp. 3. A heating apparatus characterized in that a wire net (or a perforated iron plate) is provided on an upper portion of a halogen lamp to protect a glass tube from water drops and oil drops.