JPS6327865Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a press die clamping device for fixing an upper die such as a punch to a press machine.

In general, in a press machine, an upper die such as a punch is detachably attached to a press machine such as an inner slide or ram that moves up and down, and a lower die such as a die and the upper die are fixed to a bolster facing the upper die. Processing of plate materials is done in collaboration with A clamp device is used to removably attach the upper mold to a press machine, and this clamp device usually has one end of the rod swingably attached to the clamp device body attached to the press machine, such as an inner slide. The engaging part of the rod is made to protrude from the free end, and the engaging part of the rod is engaged with a part of the upper die such as a punch, which is a member to be clamped, by swinging the rod, and the punch is attached to the ram. It is clamped by pressing it against a part of the In this type of clamp device, the rod is often divided so that its length can be adjusted. The reason is that it makes it easier to take the material and process the rod.
This makes it easier to adjust when adding a clamper to a press machine that does not have a built-in clamper.
Furthermore, the length of the rod can be changed to match the attachment part of the press machine, so that the main body side of the clamp device can be shared.

An example of a conventional clamping device capable of dividing the rod in this manner is shown in FIG. A main body 4 of a clamp device 3 for removably attaching an upper mold 2 such as a punch to the press machine (inner slide ram) 1 is installed by bolts or the like (not shown). The shaft 5 rotatably attached to the main body 4 is the center of rotation.
A link 7 fixed to the shaft 5 is pin-coupled to a rod 9 of a cylinder 8 which is attached to the main body 4 and has an eccentric part 6 having a center O ₁ and a center O ₂ eccentric thereto. The eccentric part 6 has an engaging part 10 at its tip.
A rod 11 having a diameter is attached. Therefore, as the cylinder 8 is driven, the rod 11 swings and moves vertically in accordance with the amount of eccentricity.

The rod 11 consists of a first rod 11a fixed to the eccentric part 6 and a second rod 11b having an engaging part 10 that can be engaged with a part of the upper mold 2, and these are formed on the first rod 11a. In the screw hole 12, the second
They are connected by screwing together a male threaded portion 13 formed on the rod 11b. This connection state is
The lock nut 14 screwed onto the male screw 13 is the first
This is maintained by tightening the end of the rod 11a.

However, in the rod connection structure of such a conventional clamp device, the first rod 11a and the second rod 11b are connected only by screw connection. The male threaded portion 13 of 11b is susceptible to bending stress. Furthermore, the lock nut 14 tends to loosen due to the vibration of the press machine, and this loosening causes the first lock nut to loosen.
The problem is that the connection between the rod 11a and the second rod 11b is easily disconnected by the screw connection, and when the screw connection is loosened, the screw connection part of the first and second rods becomes twisted due to the looseness of the screw. It was hot.

The present invention has been made in view of such conventional problems, and the
Even if bending force is applied to the first rod and the second rod that is screwed to it, the bending force is not applied to the threaded part using a small number of parts, thereby suppressing the occurrence of twisting of the rod. At the same time, the purpose is to improve the durability of the clamp device.

Embodiments of the present invention will be described below with reference to the drawings.
2 to 4 are diagrams showing one embodiment of the present invention, and parts common to those in FIG. 1 are given the same reference numerals. First, to explain the configuration, the base end of the screw hole 12 of the first rod 11a has a fitting hole 1 with a circular diameter larger than the inner diameter of the screw hole 12.
5 is formed, and this fitting hole 15 has a second
A small diameter portion 16 formed at the tip of a lock nut 14 screwed into the male threaded portion 13 of the rod 11b is fitted with the outer peripheral surface in close contact. This lock nut 14 is formed with a radial pressure contact surface 17 extending outward from the base of the small diameter portion 16 thereof, and a radially outward pressure contact surface 17 is formed on the distal end surface of the first rod 11a from the distal end of the fitting hole 15. The contact surface 15a extends toward the
is formed. As a result, when the small diameter portion 16 is fitted into the fitting hole 12, the radial crimping surface 17 is strongly crimped to the contact surface 15a by the screwing force against the male threaded portion 13, and the screwing force between the threaded hole 12 and the male threaded portion 13 is The connection is fixed, and the rod itself is firmly fixed to the first rod 11a. A circular fitting hole 19 having an inner diameter larger than the inner diameter of the screw hole 18 is formed at the base end of the screw hole 18 of the lock nut 14. The outer circumferential surfaces 20 formed near the proximal end of the portion 13 are fitted into each other with their circumferential surfaces in close contact with each other. A pair of flat surfaces 21 are formed on this outer circumferential surface 20 at a position outside the base end surface of the lock nut 14, and the pair of flat surfaces 21 face each other with the axis of the second rod 11b sandwiched therebetween. It forms a parallel plane. On the other hand, an angled locking member 22 is removably attached to the outer peripheral surface of the free end of the first rod 11a via a bolt 23, and the horizontal piece of the locking member 22 has a substantially U-shape. It is formed into a shape to form a pair of flat inner surfaces 23. This flat inner surface 23 has a first rotation stopper 22.
When attached to the rod 11a, the rods are connected to the flat surfaces 21 of the second rod 11b, respectively. Therefore, the second rod 11b is prevented from rotating with respect to the first rod 11a via the rotation preventing member 22. The flat surface 21 and the flat inner surface 23 substantially form an engaging portion by engaging with each other while in contact with each other. Furthermore, in the installed state of the locking member 22, the gap C between the upper end surface of the horizontal piece of the locking member 22 and the lower end surface of the lock nut 14 is
The height B of the small diameter portion 16 of No. 4 is smaller than the height B of the small diameter portion 16 of No. 4. Therefore, the rotation member 22 is connected to the nut 1.
This prevents excessive slippage in 4.

Next, the effect will be explained. Male thread part 1 in screw hole 12
3 are screwed together, and the lock nut 14 is screwed to the male threaded portion 13 at its screw hole 18, the small diameter portion 16 is tightly fitted into the fitting hole 15 of the first rod 11a. , the radial pressing surface 17 presses and fits into the contact surface 15a. Furthermore,
The outer peripheral surface 20 of the second rod 11b is fitted into the fitting hole 19 of the nut 14, and the first rod 11a and the second rod 11b are connected to the male threaded portion 1.
It will be fastened with a lock nut 14 at a portion apart from the portion 3. Therefore, no bending load is applied to the male threaded portion 13 of the second rod 11b, and only a tensile load in the axial direction is applied. Further, since the second rod 11b is prevented from rotating with respect to the first rod 11a by the rotation preventing member 22, the second rod 11b does not move forward or backward in the axial direction with respect to the first rod 11a. The length defining the clamping distance is maintained. Further, the contact surface of the lock nut 14 with respect to the first and second rods 11a, 11b is formed in the small diameter portion 16.
Since the frictional force increases at the outer periphery of the nut and the inner periphery of the fitting hole 15, it can be expected that the frictional force will increase (for example, by making the contact surface uneven, the friction coefficient will be increased). Relaxation can be prevented. Even in the unlikely event that the lock nut 14 loosens, the lower end surface of the lock nut 14 is supported by the rotation stopper 22, so that the progress of loosening is minimized and the play between the screw hole 12 and the male threaded portion 13 is prevented. No axial movement occurs between the first rod 11a and the second rod 11b.

In the above embodiment, the first rod 11a is provided with a screw hole 12, and the second rod 11b is provided with a male threaded portion 13. However, in the present invention, the first rod 11a is provided with a male threaded portion 13, and the second rod is provided with a male threaded portion 13. The present invention can also be applied to the case where the screw hole 12 is provided in the hole 11b. Furthermore, the structure of the engaging portion between the rotation stopper 22 and the rod 11 is not limited to the engagement by joining the flat outer surface and the flat inner surface. A configuration in which a pin protruding from the tip of the rotation prevention member is fitted can be used.

As explained above, according to the present invention, a fitting hole having a diameter larger than the diameter of the screw hole is formed at the tip of the first rod, and a contact surface extending radially from the tip of the fitting hole is formed. a lock nut formed on the distal end surface of the first rod and screwed onto the male thread;
Since a small diameter portion that presses into the fitting hole, a radial pressure contact surface that presses the contact surface, and a fitting hole that presses the outer peripheral surface of the second rod are formed, the first rod and the second rod If a bending force is applied, the fitting hole and the radial pressure contact surface located far from the screw hole will receive the load, and the male screw will not receive the load directly. This prevents bending stress from acting on the parts, making it possible to significantly improve the durability of the clamp device with a reduced number of parts. It also prevents the lock nut from loosening due to the vibration of the press machine, and
The progress of relaxation can be suppressed to a minimum, and the effect that the occurrence of strain between the first rod and the second rod can be suppressed can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing a conventional example, Fig. 2 is a partially cutaway front view showing an embodiment of the present invention, and Fig. 3 is a partially cutaway front view showing an embodiment of the present invention.
The figure is a plan sectional view taken along the - line in FIG. 2, and FIG. 4 is an enlarged sectional view of the main part of FIG. 2. DESCRIPTION OF SYMBOLS 1... Press machine, 2... Upper mold, 3... Clamp device, 10... Engagement part, 11... Rod, 11
a...1st rod, 11b...2nd rod, 12
...Screw hole, 13...Male thread, 14...Lock nut, 15...Fitting hole, 16...Small diameter part, 17...
...Radial pressure contact surface, 19... Fitting hole, 22... Rotating member.

Claims (1)

[Scope of utility model registration request] A rod having an engagement portion that engages with a die that is detachably fixed to a press machine is attached to the press machine so as to be able to swing freely, and the rod is attached to a first die having a screw hole.
The lock nut is attached to the male screw, and the second rod has a male screw that screws into the screw hole. The first rod has a fitting hole at its tip end that is larger in diameter than the screw hole, and a contact surface extending radially from the tip end of the fitting hole is formed on the tip end surface of the first rod.
a press-type clamp device having a small diameter portion which is brought into pressure contact with the fitting hole, a radial pressure contact surface which is brought into pressure contact with the contact surface, and a fitting hole which is brought into pressure contact with the outer peripheral surface of the second rod.