JPS6235541Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mold clamping device for a forging roll.

Conventionally, when attaching a mold to the roll shaft of a forging roll, as shown in Fig. 7, a plurality of semicircular molds b are installed in parallel around the outer periphery of the roll shaft a, and wedges c are attached with bolts. The mold b is attached and removed by pushing or pulling it out.

Work using such inputs is extremely time consuming and lacks safety.

Further, due to thermal expansion of the mold, it may become impossible to pull out the wedge due to input, and the mold can only be removed after the mold has been cooled.

Furthermore, when tightening with bolts, the tightening sometimes loosens due to shock and vibration during forging.

This invention was made to improve these conventional drawbacks, and it ensures secure clamping of the mold.
It has a strong tightening force, allowing you to work quickly and safely, and also prevents tightening from loosening due to shock or vibration.
An object of the present invention is to provide a mold clamping device for a forging roll in which the clamping device itself is not damaged.

Next, this invention will be explained in detail based on the embodiment shown in the drawings.

A mold clamping device A for a forging roll according to the present invention is composed of a longitudinally movable wedge ring 1, a vertically movable wedge ring 2, and a cylinder 3.

The longitudinally movable wedge ring 1 is a plate-shaped member having a substantially semicircular cross section, and is a member installed on the outer periphery of a roll shaft B, which will be described later. Therefore, its inner radius is the roll axis B
Match the outer radius of Also wedge ring 1
The outer circumferential radius of is formed to be approximately the same as the outer circumferential radius of the mold C having a substantially semicircular cross section.

When the longitudinally movable wedge ring 1 is installed on the roll axis B, one side is formed as an abutting surface 11 whose extension surface intersects at right angles to the axis, and the other side is formed at an acute angle to the axis. Intersecting slope 1
form 2. The inclined surface 12 is formed so that the length in the axial direction of the wedge ring 1 gradually increases from the center to both lower ends. A step 13 is formed near both ends of the wedge ring 1, and second inclined surfaces 14, 14 are formed below the step 13, respectively. The second inclined surfaces 14, 14 are formed parallel to the inclined surface 12, and T grooves 15, 15 having a T-shaped cross section are formed in the vertical direction of the inclined surfaces 14, 14, as shown in FIG. T groove 1
5 is also formed parallel to the inclined surface 14.

The vertically movable wedge ring 2 is a plate-shaped body having a substantially semicircular cross section like the longitudinally movable wedge ring 1, and is a member installed on the outer periphery of the roll axis B, which will be described later.
It should be adjacent to the longitudinally movable wedge ring 1.
Therefore, the outer and inner radii of the vertically movable wedge ring 2 are made to match those of the longitudinally movable wedge ring 1. The vertically movable wedge ring 2 has two sides in the axial direction, one of which has an extension surface that intersects at right angles to the axis, and the other side that forms an acute angle with the roll axis so that it exactly coincides with the inclined surface 12 of the longitudinally movable wedge ring 2. It is formed as a sliding contact surface 21 inclined so as to intersect with. Therefore, the sliding contact surface 21 forms steps 22, 22 at both ends thereof opposite to the steps 13, 13,
The second sliding surface 2 corresponds to the second inclined surfaces 14, 14.
3 and 23 are formed to protrude. However, the height from both ends of the vertically movable wedge ring 2 to the steps 22, 22 is 1 step from both ends of the longitudinally movable wedge ring 1.
3. It is formed somewhat lower than the height up to 13.

The second sliding contact surfaces 23, 23 have T-grooves 1 in the vertical direction.
Locking portions 24, 2 with a T-shaped cross section corresponding to 5, 15
form 4. (Fig. 5) At both lower ends of the vertically movable wedge ring 2, locking holes 25, 25 are formed in the vertical direction from the lower end surface, and locking holes 26, 25 are formed through the outer peripheral surface, and locking surfaces 26, 26 parallel to the lower end surface.
are formed around the locking holes 25, 25.

The rod 32 of the cylinder 3 is inserted into the locking hole 25 of the wedge ring 2. In this invention, in order to downsize the cylinder 3, a structure in which a piston rod 32 protrudes from the side of a cylinder case 31 is used.

That is, as shown in FIGS. 4 and 6, a groove 34 having a T-shaped cross section is formed in the piston 33 in the cylinder case 31, and the groove 34 is formed from one end of the piston 33 to the other end, and the bottom surface 35 thereof gradually curves downward. It has a slope that gets lower towards the end.

One end of the piston rod 32 is formed into a T-shaped cross section so as to fit into the groove 34. That is, a notch 36 is formed somewhat below one end of the piston rod 32 in parallel from both sides, and its lower end surface matches the slope of the bottom surface of the groove 34 and is fitted perpendicularly to the longitudinal direction of the piston 33.

The portion of the piston rod 32 protruding from the cylinder case 31 is inserted into the locking hole 25 of the vertical wedge ring 2. A collar 37 is formed in the middle of the piston rod 32 to abut against both end surfaces of the wedge ring 2, and a locking piece 38 that abuts the locking surface 26 of the wedge ring 2 is fitted at the tip.

When the clamp device A constituted by the above-mentioned longitudinally movable wedge ring 1, vertically movable wedge ring 2, and cylinder 3 is attached to the roll shaft B, it is attached so as to be in contact with the flange d formed at one end of the roll shaft B. Further, the inclined surfaces 12 and 14 of the longitudinally movable wedge ring 1 and the sliding surfaces 21 and 23 of the vertically movable wedge ring 2 are placed facing each other and adjacent to each other.

In the above state, the cylinder 3 is operated to draw the piston rod 32 downward and move the vertically movable wedge ring 2 downward. At this time, the sliding surfaces 21 and 23 of the vertically movable wedge ring 2 and the inclined surfaces 12 and 14 of the longitudinally movable wedge ring 1 are brought into sliding contact, and the longitudinally movable wedge ring 1 is moved in the axial direction of the roll axis B, so as to be adjacent to the longitudinally movable wedge ring 1. The mold C thus formed is extruded in the direction of the flange d on the opposite side and pressed and fixed.

To remove the mold C, the cylinder 3 is actuated to extend the piston rod 32 upward, and the vertical wedge ring 2 is raised. Since the vertically movable wedge ring 2 and the longitudinally movable wedge ring 1 are locked by the T grooves 15, 15 and the locking pieces 24, 24, the vertically movable wedge ring 2 pulls the longitudinally movable wedge ring 1 as it rises, and the mold C The tightening is released.

Since the forging roll mold clamp device according to this invention has the above-described configuration, the following effects can be obtained.

A cylinder is used to move the vertically movable wedge ring up and down, and the sliding surface of the vertically movable wedge ring and the inclined surface of the longitudinally movable wedge ring move back and forth to tighten or untighten the mold. Therefore, a strong clamp can be obtained, and even large molds can be reliably tightened.

Since the mold is tightened by the operation of the cylinder, it can be tightened quickly and easily with a simple switch operation, and the tightening force can be freely adjusted by adjusting the hydraulic pressure.

Also, unlike bolts, the tightening does not weaken due to shock or vibration, so you can always work safely.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of a forging roll using the clamping device according to this invention. Figure 2 is a partially cutaway side view of the clamp device.
Fig. 3 is a perspective view of the clamp device, Fig. 4 is a side view of main parts of the clamp device, Fig. 5 is a sectional view taken along line A-A,
FIG. 6 is a perspective view of a piston in a cylinder, and FIG. 7 is a partially cutaway side view of a conventional forging roll. A... Clamp device, B... Roll axis, C...
Mold, 1... Back-and-forth moving wedge ring, 2... Vertical moving wedge ring, 3... Cylinder, 12, 14
... Inclined surface, 21, 23 ... Sliding surface, 32 ... Piston rod, 33 ... Piston.

Claims (1)

[Scope of utility model registration request] A wedge ring with a substantially semicircular cross section that extends in the axial direction of the outer periphery of the roll shaft with flanges at both ends, and a wedge ring that has a substantially semicircular cross section and has an inclined surface that intersects the axial direction of the roll shaft at an acute angle at one end; A vertically movable wedge ring with a substantially semicircular cross section and a sliding contact surface that intersects at an acute angle is placed adjacently with the inclined surface and sliding surface facing each other, and the piston rod of the cylinder is fixed to both ends of the lower part of the vertically movable wedge ring. The vertical motion causes the vertical wedge ring to move up and down, and the sliding contact between the inclined surface and the sliding surface causes the longitudinal wedge ring to move in the axial direction of the roll shaft, causing the mold adjacent to the longitudinal wedge ring to become a flange. A mold clamping device for a forging roll, which is capable of being fixed by pressure contact.