JPH01130832A - Forging method and its device - Google Patents

Abstract

PURPOSE:To forge without suspending the progress of a forging stock by bearing a forging stock by the roller table before and behind a forging machine, descending a lower roller hammer after forging it by pressing in the space with an upper roller hammer by ascending the lower roller hammer and rotating it to the position with which the roller hammer is not brought into contact. CONSTITUTION:A forging is executed by upper and lower roller hammers 4, 6 without stopping the progress of the forging stock 1 passing a roller table 2. In case of hot forging the operation position of the upper and lower roller hammers 4, 6 is varied in order and at the time when a deformation is not performed the upper and lower hammers 4, 6 are separated from the forging stock 1. Moreover, the temp. reduction of the forging stock 1 is reduced by fitting a roller hammer working cylinder 6 by separating and heat insulating. to a roller hammer shaft and the service life of the hammers 4, 6 can be to extended to enable the reuse of the roller hammer shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an advanced forging method for long forged materials and an apparatus for realizing the method.

(Prior art) Forging has traditionally been carried out by placing the material to be forged on an anvil and striking it with a hammer. It has not been possible to process the material being forged using such conventional forging methods. It is conceivable to forge while moving the forging machine to match the progress speed of the material to be forged, but moving the forging machine is not practical, and even in this case, the hammer must be replaced frequently due to its lifespan. However, the problem has not yet been solved industrially.

(Problems to be Solved by the Invention) A first object of the present invention is to provide a method for forging a forged material without stopping its progress, and an apparatus for carrying out the method. A second object of the present invention is to provide a forging method with a long hammer life and an apparatus for implementing the same.

(Means 2 for solving the problem) To explain the present invention in detail, FIGS. 1 to 6 are explanatory diagrams of the implementation status of the present invention, in which a forged material 1 in progress is forged. A process in which the workpiece 1 is supported by the front and rear roller tables 2 of the machine, a process in which the lower roller hammer 3 is raised to lift up the material 1 to be forged and press forged between it and the upper roller hammer 4, and a process in which the lower roller hammer 3 is lowered to cover the upper and lower roller hammers. away from forging material 1
Roller hammer operating surface 5 that came into contact with the material to be forged in the immediately preceding process
This forging method is characterized by sequentially repeating the steps of rotating the roller hammer actuating cylinder 6 to a position where the roller hammers do not contact each other. The material 1 to be forged is continuously fed by a roller table, and the roller table can be connected to a continuous casting machine, extrusion machine, or injection molding machine. As shown in Fig. 1, when the material to be forged is not being deformed, the upper and lower roller hammers 3 and 4 are kept away from the material to be forged for as long as possible to prevent the temperature of the material to be forged from dropping and the temperature of the roller hammers from rising. By rotating the roller hammer operating cylinder to a position where the roller hammer operating surface that came into contact with the material to be forged in the process does not continue to come into contact with it, the heat load on the tool is prevented from becoming locally excessive.

The direction in which the upper and lower roller hammers send the material to be forged to the exit side is V3. It is driven to rotate in the direction of the arrow V4, but it is not easy to drive the operating surface of the roller hammer in synchronization with the speed of the processed part of the workpiece, because the deformation state changes moment by moment during one stroke. This is because the speed of the deformed portion of the material to be forged changes moment by moment, but it cannot follow this.4 In the method of the present invention, the upper and lower roller hammers are made to idle at a circumferential speed faster than the speed of the material to be forged. When the roller hammer is pressed against the material to be forged, the working surface of the roller hammer matches the speed of the material to be forged. The first means of the present invention for adjusting the working surface of the roller hammer to the machining speed of the material to be forged and not using that working surface continuously is to adjust the working surface of the roller hammer to the machining speed of the material to be forged, and to avoid using that working surface continuously. The second method is to drive with a sufficiently small driving force.
As shown in FIG. 5 or 6, this means rotatably supports a roller hammer operating cylinder 6 on a roller hammer shaft 7, so that the roller hammer operating surface can follow the surface speed of the material to be forged, which changes rapidly during processing. It is important to have a structure. The latter method is the most preferable method since the roller hammer shaft 7 is rotated faster than the roller hammer operating cylinder 6 even during roller hammer pressing, thereby reducing the uneven distribution of thermal strain between the roller hammer shaft and the bearing, thereby preventing the shaft from bending and improving its life. .

An example of a device for implementing the present invention will be described based on FIG. 3. A lower roller hammer 3 has a roller hammer operating cylinder 6 rotatably mounted on a lower roller hammer shaft, an actuator 8 that repeatedly moves the lower roller hammer 3 up and down, an upper roller hammer 4 facing the lower roller hammer 3;
and a housing 9 that holds these roller hammers in place.

A drive device that rotates the upper and lower roller hammer shafts.

This forging machine is characterized in that it is equipped with front and rear roller tables 2 for passing the material to be forged 1 between the roller hammers. The lower roller hammer 3 preferably has a roller hammer operating cylinder 6 supported by a roller hammer shaft 7 via a bearing 10, as shown in FIG. Although the upper roller hammer 4 has a shorter contact time with the material to be forged and has a better usage environment than the lower roller hammer 3, it is preferable that the lower roller hammer 3 has a structure that rotatably supports the roller hammer operating cylinder like the lower roller hammer 3. The actuator for raising and lowering is preferably a hydraulic cylinder in terms of installation space, pressure that can be generated, and economy.The upper roller hammer 4 can also be opened and closed in synchronization with the lower roller hammer by a similar mechanism, but from the perspective of economy. It is sufficient to move only the lower roller hammer up and down. The housing 9 can be similar to the housing of a rolling mill and has sufficient strength and structure to keep the upper and lower roller hammers in predetermined positions and support the forging force.

Another device for carrying out the present invention will be described based on FIG. 4. The lower roller hammer 3 has a roller hammer operating cylinder 6 eccentrically attached to the lower roller hammer shaft with the roller hammer operating cylinder 6 eccentric from the lower roller hammer rotation center 7C, and the lower roller hammer 3. an upper roller hammer 4 facing the upper roller hammer 4, a housing 9 that holds these roller hammers in a predetermined position, a drive device that rotationally drives the upper and lower roller hammer shafts, and a front and rear roller table 2 that passes the material to be forged between the roller hammers. This forging machine is characterized by being equipped with:

The lower roller hammer shaft center 7A draws a circle whose radius is the eccentric distance, and accordingly, the roller hammer operating cylinder 6 moves approximately in a circular motion.There is a gap 11 between the roller hammer operating cylinder 6 and the roller hammer shaft as shown in FIG. Alternatively, a bearing 10 can be installed as shown in FIG. 5 to insulate the area and reduce frictional resistance, thereby making it possible to reuse the roller hammer shaft 7. The vertical movement of the lower roller hammer operating cylinder is performed by a mechanism similar to a crankshaft. Although it is possible to move the upper roller hammer up and down using a similar mechanism, generally only the lower roller hammer is moved up and down for economic reasons.

(Effects of the Invention) As described above, the forging method and device of the present invention enable forging without stopping the progress of the material to be forged.

In addition, during hot forging, because the operating position of the roller hammer changes sequentially, and because the roller hammer is kept as far away from the material to be forged as possible during times when no deformation is performed, the roller hammer is roughly separated into a cylindrical roller hammer shaft that can rotate freely. Because it is installed with insulation, the temperature drop in the forged material is small.

The life of the hammer can be extended, and the roller hammer shaft can be reused.

(Field of Application of the Invention) The forging method and its device of the present invention are applicable to processes 1 in which the material to be forged is flowing continuously, such as after a continuous casting machine, after an extruder, after an injection molding machine, or after a continuous rolling machine. It is appropriate to install and implement it beforehand. The method and apparatus of the present invention, which is particularly suitable for hot forging processes in which the temperature drop of the forged material and the life of the forging tool are problematic, can be applied not only to metals but also to inorganic and organic materials that can be plastically worked.

[Brief explanation of the drawing]

FIGS. 1 to 6 are explanatory diagrams of the present invention. Figure 1 shows the state where the roller hammer is away from the material to be forged.
Figure 2 shows the state in which the roller hammer is pressing the material to be forged.
Fig. 3 shows a forging device in which the lower roller hammer is moved up and down by a hydraulic cylinder, Fig. 4 shows a forging device in which the lower roller hammer is moved up and down by an eccentric shaft, and Fig. 5 shows a roller between the roller hammer shaft and the roller hammer operating cylinder. When bearings are installed. FIG. 6 shows an example in which a gap is provided between the roller hammer shaft and the roller hammer operating cylinder, and the roller hammer shaft moves circularly around the center of rotation. 1: Forged material, 2: Roller table, 3: Lower roller hammer, 4: Upper roller hammer, 5: Roller hammer operating surface, 6
: Roller hammer operating cylinder, 6C: Center of roller hammer operating cylinder, 7 Two roller hammer shafts. 7A: Roller hammer shaft center, 7C: Roller hammer rotation center, 8: Actuator, 9: Housing. 10: Bearing, 11: Gap, 12: Reduction device. V 1 , V 2: speed of forged material, V3. V4: 0-
Lahammer shaft peripheral speed, V5. V6: Roller hammer operating cylinder peripheral speed, Yl, Y2: Lower roller hammer movement direction.

Claims (4)

[Claims] (1) A process in which the material being forged is supported by the roller tables at the front and rear of the forging machine, a process in which the lower roller hammer is raised to lift the material to be forged, and pressure forged between the upper roller hammer and the lower roller hammer. A forging method characterized by sequentially repeating the steps of lowering the upper and lower roller hammers to separate them from the material to be forged, and then rotating the roller hammer operating cylinder to a position where the roller hammer operating surface that was in contact with the material to be forged in the previous step does not continue to come into contact with the material to be forged. (2) The forging method according to claim 1, which is carried out while rotating the roller hammer shaft faster than the roller hammer operating cylinder. (3) A lower roller hammer in which a roller hammer operating cylinder is rotatably mounted on the lower roller hammer shaft, an actuator that repeatedly moves the lower roller hammer up and down, an upper roller hammer that faces the lower roller hammer, and holds these roller hammers in a predetermined position. A forging machine characterized by being equipped with a housing, a drive device that rotationally drives upper and lower roller hammer shafts, and front and rear roller tables that pass a material to be forged between the roller hammers. (4) a lower roller hammer in which a roller hammer operating cylinder is mounted eccentrically from the rotation center of the lower roller hammer and rotatably attached to the lower roller hammer shaft; an upper roller hammer that faces the lower roller hammer; and a housing that holds these roller hammers in predetermined positions; A forging machine characterized by being equipped with a drive device that rotationally drives upper and lower roller hammer shafts, and front and rear roller tables that pass a material to be forged between the roller hammers.