JPS6144562B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a pretreatment device for extrusion billets in extrusion equipment. (Prior Art) It is known that an extrusion billet in an extrusion facility is heated as a pretreatment for extrusion, whether the extrusion type is direct extrusion or indirect extrusion, and is made into a so-called hot billet. Further, the heating temperature varies depending on the material and the extrusion type, for example, from 350°C to 500°C, and it is natural that the extrusion temperature conditions should be optimized. On the other hand, billets for extrusion are subjected to scalping treatment to remove the outer skin in the axial direction of the billet as a pre-treatment for extrusion, and this usually leads to deterioration of product quality due to the metal flow in indirect extrusion presses. Therefore, scalping treatment is essential. Also, recently, scalping has become necessary in direct extrusion presses, especially for high-strength products such as aircraft materials, which require higher quality. From this point of view, a pretreatment device for an extrusion press has been proposed in which a billet is heated and then shaved, as disclosed in JP-A-50-10263. (Problems to be Solved by the Invention) By the way, in the pretreatment device disclosed in JP-A-50-10263, heating is performed to a scalping temperature equivalent to the extrusion temperature; If this is high, the scalping temperature will also be high, leading to problems such as buckling of the billet into a so-called barrel shape during scalping or deformation of the chip, which increases the required scalping force. Therefore, the present invention prevents billet buckling during scalping by heating to a temperature suitable for scalping that is lower than the extrusion temperature regardless of the extrusion temperature, and furthermore, the required force for scalping can be minimized. By reheating after scalping to a temperature suitable for the extrusion temperature, sufficient soaking time for the hot billet can be obtained, and the temperature distribution in the radial and axial directions is well spread, making it possible to obtain extruded products of excellent quality. In particular, the heating device is equipped with a heating element that can be changed between the scalping temperature and a higher temperature, and the heating device and the scalping device are connected by a closed-loop conveying device. be. (Means for Solving the Problems) The technical means taken by the present invention to achieve the above object are characterized by a billet heating device and a billet scalper for removing the axial outer skin of the hot billet. In the extrusion equipment equipped with a pre-treatment device, the billet heating device has a heating element that can be controlled to change between a temperature suitable for scalping and a temperature suitable for extrusion that is higher than the scalping temperature, and the billet heating device A billet scalper is provided on the outlet side of the first conveying device via a communication conveying device, and is parallel to the first conveying device. and a second conveyance device that can be freely switched back and forth,
Further, a third conveying device is provided which can stand by at each output side of the first and second conveying devices and the billet scalper device and can reciprocate while supporting the billet, and the container of the extrusion equipment is transported through the third conveying device. The present invention is capable of supplying a hot billet that has been scalped, and is provided with a communication conveyance device that connects the first and second conveyance devices to each other on the entrance side to the billet heating device. (Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic plan view of the equipment according to the present invention, in which 1 is an extrusion press, pressure stems 2,
The extrusion apparatus is configured to include parts and members necessary for extrusion, such as a drive device 3, a container device 4, and a die stem 5. A pretreatment device 6 is provided on one side of the extrusion press 1, and the pretreatment device 6 is mainly composed of a heating device 7 and a scalper device 8. The heating device 7 heats the billet B uniformly over the entire length of the billet to a temperature suitable for scalping, for example, Y° C., as shown in FIG. A heating element capable of uniformly reheating the entire length of the billet to a temperature Y1°C suitable for an extrusion temperature higher than Y°C, or tapered heating on the condition that the temperature is higher than Y°C as shown in FIG. For example, the reheating method shown in Fig. 3 2 is suitable for a direct extrusion press where the billet length (horizontal axis X in the figure) is short, and the reheating method shown in Fig. 3 3 is suitable for a long billet length. It is suitable for indirect extrusion presses. The heating element method is induction method,
Kerosene or gas combustion type or other types may be used. As an example of the scalper device 8 is shown in FIG. 3, the scalper device 8 includes a scalper die 8A, a reciprocating scalper pressurizing stem 8B, and the like. In FIG. 1, reference numeral 9 denotes a first conveying device, which is illustrated in the form of a roller table, and a heating device 7.
It consists of an inlet conveying device 9A and an outlet conveying device 9B. 10 is a communication conveyance device, and the first conveyance device 9
The billet B can be transported between the output transport device 9B and the scalper device 8 at. Reference numeral 11 denotes a second conveying device, which is exemplified in the form of a roller table, and is arranged parallel to the first conveying device 9, so that the billet can be conveyed back and forth. Reference numeral 12 denotes a third conveyance device, which has a track 12A with a length spanning the exit side of the scalper device 8 and the respective exit sides of the first and second transport devices 9 and 11, and is capable of freely reciprocating on the track. The carriage 12B includes a roller table capable of stopping the output side of the scalper device 8 and the output sides of the first and second conveyance devices 9 and 11 at respective corresponding positions. Reference numeral 13 denotes a communication conveyance device, which connects the first and second conveyance devices 9 and 10 with each other on their respective entry sides. In addition, a conveying device 15 for a billet conveying body 14 such as a billet loader is provided on the exit side of the third conveying device 12. In addition, in Figure 1, 1
Reference numeral 6 indicates a scalper chip conveying device, and 17 indicates a disk card processing device of an extrusion press. Next, the effect will be explained. First, the billet is loaded into the heating device 7 by the first conveying device 9, and before being scalped, the entire billet is heated to a temperature suitable for scalping, and then delivered to the scalper 8 via the communication conveying device 10. Hot billet B is scalped over its entire axial length in the manner shown. Next, the hot billet after scalping is delivered to the trolley 12B on the third transport device 12, and the transport device 12 is moved forward to transfer the hot billet to the second transport device 11, and then transferred to the trolley on the third transport device 12. 12B is placed on standby for return movement on an extension of the output conveyance device 9B. On the other hand, the scalped billet B on the second conveying device 11 is transferred to the first conveying device 9 via the conveying device 13, and then charged into the heating device 7 again to have a temperature higher than the scalping temperature. That is, it is reheated to a temperature suitable for the extrusion temperature, and after the reheating is completed,
The billet is delivered to the first conveying device 9 and the trolley 12B waiting on its extension, and then loaded into the center of the extrusion press by the billet conveying body 14 via the conveying device 15. The above is the basic concept of the present invention. Although the billet material contains copper, when the billet material is aluminum or its alloy, it is heated to 150°C to 350°C in the heating device 7 before scalping.
At this temperature, it is scalped using a scalper 8 in the same manner as described above, and then it is reheated using a heating device 7 to an extrusion temperature higher than the scalping temperature, that is, from 350°C to 500°C. The examples are shown in the table below.

[Table] (Effect of the invention) In the conventional example, since the temperature of hot billet B is equivalent to the extrusion temperature, when scalping is performed as chip B1 as shown in FIG.
As shown in , the chip B1 is buckled and deformed into a barrel shape.
However, in the present invention, there is no barrel-like buckling deformation and the chip has a good shape. That is, the cross-sectional area of the hot billet B and the cross-sectional area of the pressurizing stem 8B are constant, and therefore, as the scalping allowance (chip thickness) increases, buckling deformation occurs due to the higher temperature in the conventional example. Also, during scalping, the flow of the chips on the die surface becomes poor, the shape of the chips collapses, and the scalping force becomes more than necessary, which in turn causes buckling deformation of the billet. The present invention solves this problem. In addition, in the present invention, after scalping, the heating device 7 is used to raise the temperature to a temperature suitable for extrusion above the scalping temperature and reheat the billet. This results in a better temperature distribution,
In this way, the reheated hot billet suitable for the extrusion temperature is transferred to the billet conveyor 14 via the conveyor device 15.
The container device 4 located at the center of the extrusion press 1 is loaded via the container device 4 in a known manner. In particular, in the present invention, since the heating device 7 has a heating element that can change the scalping temperature and the extrusion temperature higher than this temperature, a closed loop is provided by the first, second, and third conveying devices 9, 11, 12, etc. By using a transport route, only one heating device 7 is required, which has the advantage that the entire equipment can be designed compactly.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing the entire equipment according to the present invention, Fig. 2 is a detailed view showing the billet scalping behavior of the conventional and the present invention, and Fig. 3 is an explanation showing the billet heating behavior. It is a diagram. 1... Extrusion press, 6... Pretreatment device, 7...
Heating device, 8... Scalper, 9... First conveying device, 11, 12... Second and third conveying device.

Claims (1)

[Scope of Claims] 1. An extrusion facility equipped with a pretreatment device having a billet heating device and a billet scalper for removing the axial outer skin of the hot billet, wherein the billet heating device has a temperature suitable for scalping and a scalping temperature. It has a heating element that can be controlled to change the temperature suitable for extrusion as described above, and is equipped with a first conveying device that allows the billet to be taken in and out of the billet heating device, A billet scalper device is provided on the side via a communication conveyance device, and a second conveyance device that is parallel to the first conveyance device and can be switched back and forth is provided,
Furthermore, a third conveying device is provided which can stand by at each exit side of the first and second conveying devices and the billet scalper device and can freely reciprocate while supporting the billet. For extrusion in extrusion equipment, which is capable of supplying scalped hot billet into a container and is equipped with a communication conveyance device that interconnects the first and second conveyance devices on the entrance side to the billet heating device. Billet pretreatment equipment.