JPH0231619B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a forging device for hot rolling slab material suitable for width compression work of hot rolling slab material that requires high-mix low-volume production and high operating rate. Regarding.

[Background of the invention]

Conventionally, there is a forging device for hot rolling slab materials as shown in Fig. 4 (Precision Machinery Vol. 49, No. 8, No. 25).
page). This device is comprised of a pair of compression mechanisms and a pair of initial position setting mechanisms. The compression mechanism is
It has gears 10, 12 connected to a drive motor (not shown) for transmitting the power thereof, and an eccentric cam 14 is provided in contact with the gears 10, 12.
The eccentric cam 14 is provided with a pit man 16 that converts rotational motion into reciprocating motion, and the reciprocating motion of the pit man 16 is transmitted to a pair of forging tools 18 placed on both sides of the workpiece (not shown). do. This power is transmitted between the pittman 16 and the forging tool 18.
Swing link 20, link 22, arranged between
A slide 26 that slides within the C-shaped frame 24 by a link 22, pins 28, 30, 32 that connect these links, and a C-shaped frame on which a set of these is mounted.
It is composed of a mold frame 24.

In addition, the initial position setting mechanism is a C-shaped frame 24.
A ring-shaped frame 34 mounted horizontally on
, a hydraulic cylinder 38 containing a piston rod 36 and arranged horizontally within the frame 34 , and a pin 4 attached to the tip of the piston rod 36 and connecting the piston rod 36 and the swing link 20 .
It consists of 0.

The operations of this conventional hot-rolling slab material forging apparatus are roughly divided into a compression operation with a small stroke and high cycle, and an initial position setting operation with a large stroke and low cycle. First, in the compression operation, when a drive motor (not shown) is driven, the eccentric cam 14 rotates via the gears 10 and 12, and the pin 28 incorporated in the pit man 16 performs reciprocating motion. Swing link 2
0, the intermediate part is connected to the piston rod 3 by the pin 40.
6, the piston rod 36 swings around the pin 40 at a preset position. This rocking motion causes the slide 26 to reciprocate via the pins 30, 32 and the link 22, and the forging tool 18 moves toward the C-shaped frame 22.
It performs reciprocating motion along with the slide 26 on the top.

The compression mechanism consists of a pair of mechanisms arranged almost symmetrically, and also includes a pair of left and right eccentric cams 14.
Since two gears, ie, gears 10 and 12, are arranged between them, the pair of eccentric cams 14 operate symmetrically as the gear 10 rotates. The operation of the pair of eccentric cams 14 causes the entire pair of left and right compression mechanisms including the forging tool 18 to operate symmetrically. Therefore, when a workpiece (not shown) is inserted between the pair of forging tools 18, the drive motor (not shown)
By rotating the machine, the workpiece can be forged through these machines.

Next, in the initial position setting operation, when pressure oil is supplied into the hydraulic cylinder 38 by a pressure oil supply device (not shown) or pressure oil is discharged from the hydraulic cylinder 38, the pin 40 moves via the piston rod 36. , the swing link 20 rotates about the pin 40 as a fulcrum. Therefore, the swing link 20 horizontally moves the forging tool 18 along with the slide 26 on the C-shaped frame 24 via the link 22. Therefore, by supplying an appropriate amount of pressure oil into the hydraulic cylinder 38 or discharging pressure oil from the hydraulic cylinder, the forging tool 18 can be positioned at an appropriate position when the compression device is not operating (initial position). The forging tool 18 can be installed at. In addition, since the initial position setting mechanism consists of a pair of mechanisms arranged almost symmetrically, by supplying or discharging the same amount of pressure oil into the left and right pair of hydraulic cylinders 38,
The pair of piston rods 36 can be operated symmetrically, and furthermore, the entire pair of left and right initial position setting mechanisms including the forging tool 18 can be operated symmetrically.

Therefore, by supplying pressure oil to the hydraulic cylinder 38 or discharging pressure oil from the hydraulic cylinder 38, the initial positions of the pair of forging tools 18 can be set appropriately through the devices that constitute the initial position setting mechanism. Can be set to Furthermore, the pair of forging tools 18 are
The equipment constituting the compression mechanism described above reciprocates on the C-shaped frame 24 with its initial setting position as a base point, and the workpiece inserted between the pair of forging tools 18 can be forged.

However, with this conventional device, there are problems that must be fully recognized in terms of the dimensional accuracy of the forged product. First, regarding the initial position setting mechanism,
A pin 40 serving as a fulcrum of the swing link 20 is supported by a hydraulic cylinder 38 via a piston rod 36. Therefore, even if the amount of pressure oil inside the hydraulic cylinder 38 is set appropriately, the pressure oil inside the hydraulic cylinder 38 is compressed by the large forging force, and this moves the pin 40 via the piston rod 36, causing the setting of the forging tool 18. The position changes. Furthermore, since this amount of movement changes depending on the forging force, it has a large effect on the dimensional accuracy of the product.

The solid line in Figure 5 is a trial calculation of the product dimensional error due to compression of the pressure oil in the hydraulic cylinder 38 (cylinder diameter 1000 mm, tool stroke 100 mm).
In the case of a forging load of 2000 tons, the product dimensional error reached 3 mm, indicating that the dimensional error was large and it was not suitable for a large-load compressor.

The compression mechanism then transmits the reciprocating motion of the pitman 16 to the forging tool 18 through a number of links that reduce the stiffness of the mechanism. Therefore, the rigidity of the compression mechanism is also low, resulting in a decrease in product dimensional accuracy. This also becomes an impediment to increasing the size (larger capacity ratio).

In order to obtain a product with good dimensional accuracy using the conventional device described above, the position of the forging tool 18, which is affected by the displacement of the piston rod 36 and the deformation of the swing links 20 and 22 under load, is sequentially detected.
It is necessary to sequentially control the pushing position of the piston rod 36, and a complicated control mechanism is required.

On the other hand, a horizontal upsetting machine described in Japanese Patent Publication No. 49-47142 is related to a forging device for hot rolling slab materials. In this conventional device, the initial position of the movable ram is set using a worm wheel and a worm that meshes with the worm wheel.

However, in this conventional device, heat generation and wear occur between the worm and the worm wheel due to poor transmission efficiency of the worm. Cooling equipment is required due to the heat generated. In addition, positioning errors occur due to wear, resulting in poor product dimensional accuracy. In the end, even if the apparatus of Japanese Patent Publication No. 49-47142 is applied to forging large parts such as slab materials for hot rolling, the dimensional accuracy of the product will be poor.
Moreover, a worm wheel for driving the worm must be provided in the device, which is disadvantageous in increasing the size of the device.

[Purpose of the invention]

In order to solve these problems, the present invention is a highly rigid device that does not cause large deformation during forging, has good dimensional accuracy, and is suitable for hot rolling slab materials for large sizes. The purpose is to provide forging equipment.

[Summary of the invention]

In order to achieve the above object, the present invention includes a pair of freely slidable tools that are arranged oppositely in a housing and apply an external force to a workpiece, and a reciprocating motion is given to the tools to move the tools toward and away from each other. In the forging apparatus for hot rolling slab material, the forging device includes a drive device for moving the tool, and a pair of position adjustment devices for determining the initial position of the tool, the drive device includes a crankshaft that rotates, and a slide that moves forward and backward by the crankshaft. The position adjustment device includes a movable outer block and a shaft supported by the outer block and for sliding the tool, and the position adjustment device includes a nut formed on the tool side of the shaft and the outer block screwed into the nut. a threaded portion formed on the nut, a spline portion provided at the other end of the nut on the tool side, a reduction gear that slidably meshes with the spline portion, and a drive device that drives the reduction gear, The tool consists of an inner block that makes surface contact with the tip of the shaft, and a forged tool fixed to the inner block, and the tool communicates with a cylinder that is biased in a direction to move away from each other when the shaft retreats. This is a forging device for hot rolling slab material, which is characterized by:

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the forging apparatus for hot rolling slab materials according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partially sectional plan view of an embodiment of a forging apparatus for hot rolling slab material according to the present invention. In FIG. 1, the forging apparatus for hot rolling slab material is comprised of a pair of compression mechanisms and a pair of initial position setting mechanisms including a screw mechanism and a gear mechanism.

The compression mechanism is driven by a crankshaft 48 supported by a pair of housings 44 and 46 connected by a frame 42. The crankshaft 48 is connected to a shaft 50 at one end, and is rotationally driven by a drive motor 54 via a drive machine 52 . A connecting rod 56 is provided on the crankshaft 48, and this connecting rod is adapted to come into sliding contact with an outer block 58 provided on the housings 44, 46. This outer block 58 serves as a holder that supports the shaft 60. The shaft 60 has a tip (the left end in FIG. 1) that is connected to the housings 44, 4.
The forging tool 64, which is fixed to the inner block 62, is reciprocated in the longitudinal direction of the housings 44, 46 through the inner block 62 in cooperation with a cylinder, which will be described later. Between the pair of forging tools 64, the plate width is about 2 m and the plate thickness is about 30 mm.
Slab material for rolling at a high temperature of about 1.2 cm is fed.

On the other hand, the initial position setting mechanism is composed of a screw mechanism and a gear mechanism. That is, a nut 66 provided on the outer block 58 and a threaded portion 6 formed at the tip of the shaft 60 that is screwed into the nut 66.
8. The rear end side (rightward in the figure) of the shaft 60 is a spline portion 70, and this spline portion 70 meshes with a gear 74 provided in a gear case 72. The gear 74 meshes with a gear 76, and this gear 76 connects to an input shaft 78,
It is rotated by a drive motor 82 via a drive machine 80 . Note that the gear 74 and the gear 76 form a reduction gear that slidably meshes with the spline portion 70. In addition, as shown in Fig. 2, the inner block 6
2 is connected at its upper end to a piston rod 86 of a balance cylinder 84 provided at the top of the frame 42.

According to this embodiment, since there is no initial position setting mechanism consisting of the nut 66 and shaft 60 in the inner block 62, even if heat is transferred from the workpiece to the inner block 62 via the forging tool 64, No seizure lock occurs between the nut 66 and the shaft 60. Furthermore, as described above, since there is no initial position setting mechanism within the inner block 62, the actual volume of the inner block 62 is sufficient and its strength is large. Note that the reference numeral 88 shown in FIG. 1 indicates the center of the path of the workpiece.

The operation of the embodiment configured as described above is roughly divided into a small stroke high cycle compression operation and a large stroke low cycle initial position setting operation. The compression operation is performed by driving the drive motor 54.
The crankshaft 48 supported within the housings 44, 46 via the shaft 50 rotates, and the inner and outer blocks 62, 5 slide within the connecting rod 56 and the housings 44, 46 depending on the eccentricity of the crankshaft 48.
8 moves in the longitudinal direction of the housings 44, 46;
A forging tool 64 fixed to the inner block 62 reciprocates. That is, the connecting rod 56 is at the path center 88.
When moving in this direction, the forging tool 64 is forced into action by a series of compression mechanisms, and the conrod 56
When moving away from the path center 88, the balance cylinder 8 disposed on the frame 42
4 is connected to the inner block 6 via the piston rod 86.
2 against the end of the shaft 60. Therefore, during the compression operation, the forging tool 64 always follows the rotation of the crankshaft 48 and reciprocates. Furthermore, since the threaded portion 68 of the shaft 60 is engaged with the nut 66, the shaft 60 also reciprocates together with the outer block 58 that accommodates the nut 66. At this time, the rear end of the shaft 60 is
A spline portion 70 is formed, and this spline portion 70 meshes with the gear 74, and the gear 74 is fixed in the axial direction by the gear case 72, so that the internal teeth of the gear 74 and the shaft 6 during compression operation.
0 and the spline portion 70 always performs sliding motion.

The initial position setting operation is performed as follows. When the drive motor 82 is driven, the drive machine 80
Input shaft 7 supported by gear case 72 via
8. The gears 76, 74 and the shaft 60 rotate, and the shaft 66 slides between the spline portion 70 and the internal teeth of the gear 74 due to the nut 66 and the threaded portion 68 of the shaft 60, and rotates the outer block 58. Move in the axial direction as the base point. In addition, the inner block 62
is pressed against the tip of the shaft 60 by the balance cylinder 84. Therefore, as the input shaft 78 rotates, the gap between the inner block 62 and the outer block 58 increases or decreases, and the distance between the forging tool 64 and the connecting rod 56 increases or decreases.

In this embodiment, as described above, the drive motor 8
2, the gears 74 and 76, the input shaft 78, and the spline part 70 form an initial position setting mechanism, so the transmission efficiency to the spline 70 is good.
As a result, no heat is generated, so a large cooling device is not required. Moreover, since the transmission efficiency is good, there is no wear on the spline portion 70 and the gears 74, 76, thereby eliminating initial position setting errors and improving product dimensional accuracy.

The pair of left and right compression mechanisms and the pair of left and right initial position setting mechanisms are arranged approximately symmetrically with respect to the path center 88, and the left and right mechanisms can also be operated symmetrically with respect to the path center 88. Moreover, it is also possible to operate asymmetrically left and right if necessary.

Figure 3 shows a pair of left and right forging tools 6 by each mechanism.
4, the dimensions of the workpiece,
The initial position of a pair of left and right forging tools 64 is set by an initial position setting mechanism according to the amount of forging, the forging tools 64 are reciprocated by a compression mechanism, and a workpiece (not shown) is inserted between them. It can be seen that it can be forged. In the embodiment configured as described above, the inner and outer blocks 62, 58, shaft 60,
Since the connecting rod 56 and the crankshaft 48 are arranged substantially linearly, the amount of deformation of the entire mechanism due to forging force can be kept to a minimum. In addition, an electric screw mechanism is used for the initial position setting mechanism, and if the diameter of the shaft 60 is 350 mm and the tool stroke is 100 mm, the amount of variation in the initial position due to forging force can be minimized as shown by the broken line in Figure 5. It can be kept to a small value. Therefore, the forging equipment for hot-rolling slab materials of the example is a highly rigid equipment with less equipment deformation due to forging force than the conventional equipment, and therefore products with good dimensional accuracy can be easily obtained. , it can also be said that it is a mechanism suitable for increasing the capacity of mechanical performance.

In this embodiment, the gear mechanism (gears 74, 76 in FIG. 1, spline part 70) of the initial position setting mechanism and the drive device (driver 80, drive motor 8 in FIG. 1) are used.
2) is a forging device for hot-rolling slab material suitable for upsizing because it is formed outside the housing 44 and can take up a sufficient volume for the inner block 62 and the like.

The balance cylinder 84 may be operated so as to press the inner block 62 against the tip of the shaft 60 at all times, but the drive energy of the compression mechanism can be reduced by synchronously operating it when the conrod 56 is retracted. You can. Further, in the embodiment described above, the outer block 58 is slid through the connecting rod 56 provided on the crankshaft 48, but the outer block 58 may be provided directly on the crankshaft 48. Furthermore, by rotatably connecting the tip of the shaft 60 to the inner block 62, the balance cylinder 84 can be omitted.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to obtain a forging device for hot rolling slab material that has high rigidity and does not undergo large deformation during forging.

Furthermore, according to the present invention, the initial position setting that determines the dimensions of the product to be supplied between the pair of forging tools is performed by moving the shaft using the reduction gear, so the transmission efficiency by the gear is good. By doing so, initial position setting errors due to gear wear are reduced, and product dimensional accuracy is improved.

Further, since the reduction gear and the drive device for driving the gear are provided at the other end of the forging tool on the shaft side, that is, outside the housing, and a cooling mechanism is not required, the hot rolling slab according to the present invention It is suitable for large-sized material forging equipment.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view of an embodiment of the forging apparatus for hot rolling slab material according to the present invention, and FIG.
The figure is a partially sectional side view of an embodiment of a forging device for hot rolling slab materials according to the present invention, and FIG. 3 is a forging device of a forging device for hot rolling slab materials according to an embodiment of the present invention. FIG. 4 is a side view of a conventional forging device for hot rolling slab materials, and FIG. 5 is a diagram showing the trajectory of a tool, FIG. It is a figure which shows the comparison of the dimensional error of a product by forging load with the forging apparatus of the slab material for inter-rolling. 44, 46...housing, 48...crankshaft,
52, 80... Drive mechanism, 54, 82... Drive motor, 56... Conrod, 58... Outer block, 60
...Shaft, 62...Inner block, 64...Forging tool, 66...Nut, 68...Threaded part, 70...Spline part, 74, 76...Gear, 84...Balance cylinder.

Claims (1)

[Scope of Claims] 1. A pair of freely slidable tools that are arranged oppositely in a housing and apply an external force to a workpiece;
A forging device for hot rolling slab material having a drive device for separating the tools, and a pair of position adjustment devices for determining the initial position of the tool, the drive device having a crankshaft that rotates, and a crankshaft that moves forward and backward by the crankshaft. and a shaft supported by the outer block and for sliding the tool, and the position adjustment device is screwed into a nut formed on the tool side of the shaft. A threaded portion formed on the outer block, a spline portion provided on the other end of the nut on the tool side, a reduction gear that slidably meshes with the spline portion, and a drive device that drives the reduction gear. The tool consists of an inner block that makes surface contact with the tip of the shaft, and a forged tool fixed to the inner block, and the tools are urged in a direction to separate from each other when the shaft retreats. A forging device for hot rolling slab material, characterized by being connected to a cylinder.