JPS6113194Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a simple and inexpensive wedge press that utilizes an increase in the force ratio of the wedge.

Presses that are generally used as general-purpose machines are required to produce multiple types of parts using the same machine, so one type of part is first produced in bulk using one mold (lot production). Then, after replacing the mold, a different type of part is produced all at once. Therefore, parts are kept in stock as stock products and shipped out when necessary.

Furthermore, general-purpose machines are generally large in size and expensive because they have a somewhat large capacity so that they are suitable for use in many types, and are equipped with strong frames and large drive devices. Furthermore, if a dedicated machine is provided for each part, it has the advantage of eliminating the need for man-hours for changing molds to produce various parts, but since the number of machines required increases, general-purpose machines are generally not required. This is actually more expensive than installing a machine.

However, in recent mass production factories, it is required to eliminate the need for people to store, manage, transport, distribute, etc. the component parts, eliminate parts warehouses, and eliminate inventory of parts in order to increase capital turnover. In order to reduce processing man-hours, it is desired to reduce the man-hours required for exchanging press dies.

The present invention was devised in view of the above circumstances. By using a wedge-based press with a simple structure and low cost as a dedicated machine, the number of man-hours required for changing molds is completely eliminated and lot production can be performed. This system eliminates inventory of parts by producing at the right time and in the right quantity to meet needs, and by using dedicated machines on the line side, surplus man-hours on the line can be absorbed. (a) a frame formed by connecting first and second plate-shaped bodies arranged opposite to each other so that their relative positions remain unchanged by a connecting member; and (b) a first plate-shaped body. (c) a movable mold movable in a direction perpendicular to the fixed mold and immovable in a parallel direction guided by a first guide; and (d) a movable mold located behind the movable mold. It is guided by a second guide different from the first guide so as to be movable in the same direction as the movable mold, and the gap between it and the second plate-like body gradually decreases in a direction substantially perpendicular to the moving direction of the movable mold. a transmission member forming a wedge-shaped space;
(e) a buffer material disposed between the transmission member and the movable mold, which transmits the force transmitted by the transmission member to the movable mold while allowing minute relative movement between the two; and (f) the above-mentioned a wedge body that is slidably inserted into the wedge-shaped space and brings the transmission member into surface contact with the second plate-shaped body;
(g) A drive mechanism is provided that is attached to the frame and moves the wedge body forward and backward in a direction in which the gap changes.

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In the figure, reference numeral 1 denotes a bed whose upper surface has an inclination of θ ₁ with respect to the horizontal plane, and side frames 2, 2 are erected on both sides of the bed 1. A crown 3 is supported on the side frames 2, 2 so as to form a gate shape at a position opposite to the bed 1, and a fixed mold mounting base 5 to which a fixed mold 4 is attached is further fixed to the crown 3. ing. A movable mount 8 is held by four rods 6 slidably attached to the fixed mount 5, and a movable mold 7 is fixed thereto.

As is clear from the above description, the crown 3 and bed 1 function as the first and second plate-like bodies, respectively, and together with the side frame 2, they constitute the frame as the main body of the wedge press. There is. The four rods 6 that guide the movable mold 7 via the movable mold mount 8 constitute a first guide.

A wedge body 9 is disposed along the slope of the bed 1 so that its tapered direction is in the direction of the upward slope of the bed 1, and is slidable in the direction of the slope of the bed 1 but at right angles thereto. A guide piece 10 is attached to the bed 1 so as to be immovable in any direction.

A transmission member 11 is provided between the wedge body 9 and the movable mounting base 8 for transmitting force to both. This transmission member 11 is a rectangular prism arranged almost vertically, and its upper surface abuts against the movable mounting base 8 via a cushioning material 1 such as urethane rubber.
It is slidably held on the wedge body 9 with a lower surface having an inclined surface equal to the slope of the upper surface of the wedge body 9.
In order to reduce friction, a plurality of cylindrical graphite members are embedded in the contact surface of the wedge body 9 with the bed 1 and the transmission member 11, and in the contact surface of the transmission member 11 with the wedge body 9. Chrome plating is applied. Further, in order to prevent the transmission member 11 itself from moving in the direction in which the wedge body 9 tapers, a backup member 13 is fixed to the bed 1. Furthermore, so that the transmission member 11 moves in the vertical direction but not in the horizontal direction,
A guide piece 14 is fixed to the backup member 13. Backup member 13 and guide piece 14
The second guide is constructed by the following.

On the other hand, a backup plate 15 of a speed reducer is erected at the left end (FIG. 1) of the upper surface of the bed 1, and its right side surface 15a is formed at right angles to the inclined surface of the bed 1. The head 19 of the screw shaft 22 extending from the reducer 16 installed on this surface 15a is inserted into the recess 9a provided on the end surface of the wedge body 9 (on the opposite side of the tapered part), and Retaining plate 17 attached to
is prevented from coming out of the recess 9a. A motor 18 that drives this reducer 16 with a belt is fixed to the side frame 2.

As shown in FIGS. 2 and 3, the reducer 16 includes a screw nut 23 rotatably supported by a case 21, and the screw shaft 22 is screwed into the screw nut 23. are combined. A worm wheel 24 is attached to the screw nut 23 by a spacer ring 25 and bolts 26, and a worm 28 whose both ends are supported by conical roller bearings 27 is meshed with the worm wheel 24. ing.
A thrust bearing 29 is disposed at the end of the screw nut 23 which receives thrust as the screw shaft 22 expands. The tip of the screw shaft 22 is finished with a convex surface, and a two-chamfered portion 30 with which the retaining plate 17 can be engaged is carved near the tip.

In this configuration, when the worm 28 and worm wheel 24 are rotated by the motor 18, the screw nut 23 is also rotated at the same time. As the screw nut 23 rotates, the screw shaft 22 is gradually pushed out along the slope of the bed 1 while being supported by the reaction force by the thrust bearing 29, thereby pushing the wedge body 9. The motor 18 and the speed reducer 16 constitute a drive mechanism for the wedge body 9. As the wedge body 9 gradually slides along the inclined surface of the bed 1 while being guided by the guide piece 10, the transmission member 11 is guided by the backup member 13 and the guide piece 14 and is pushed upward. The movable mounting base 8 is also pushed up via the cushioning material 12, and guided by the four rods 6 to move upward. Therefore, the fixed mounting base 5
A desired pressing operation can be performed between the fixed die 4 fixed to the movable die mount 8 and the movable die 7 fixed to the movable die mount 8.

Furthermore, when opening the mold, the motor 18 is reversely rotated to pull in the screw shaft 22, but since its head 19 is engaged with the retaining plate 17, the wedge body 9 is also pulled back at the same time. At the same time, the transmission member 11 and the movable mold mount 8 are simultaneously lowered by their own weight, so that the mold can be opened.

At this time, there is a large frictional resistance between the upper surface of the transmission member 11 and the cushioning material 12, and a means to extremely reduce the frictional resistance between the upper surface of the transmission member 11 and the wedge body 9 is provided on the lower surface thereof. As the transmission member 11 moves backward, the transmission member 11 does not move in the same direction.

The relationship shown in Figures 4 to 6 exists for the change in the force ratio with respect to the angle of the tip of the wedge body 9. That is, if the inclination angles of the bed 1 and the transmission member 11 are _θ1 and _θ2 , respectively, the angle of the tapered portion of the wedge body is _θ1 + _θ2 . Here, _θ1 =
FIG. 5 shows the relationship between the input Q and the output F with the angle 2θ as a parameter when _θ2 = θ and the friction coefficient μ = 0.1. According to the figure, when 2θ = 11°, the output is 90 tons for an input of 36 tons, and
In Fig. 6, the relationship between the input Q and the output F is shown as the friction coefficient μ parameter when θ ₁ = θ ₂ (2θ = 11°).
As is clear from the above explanation, the output of the reduction gear 1 is 90 tons.
The multiplying mechanism of the wedge body 9 and the press body 6 makes it possible to obtain a very large pressing capacity from a very small driving source.

Furthermore, since the cushioning material 12 is made of an elastic material such as urethane rubber, even if the facing surfaces of the movable mount 8 and the transmission member 11 are not parallel to each other, its elasticity This allows the transmission of the acting force to be averaged over the contact surface. Therefore, the presence of the cushioning material 12 allows the press to operate smoothly and increase its durability.

Furthermore, since the movable mounting base 8 is guided by the rod 6 and the transmission member 11 is guided by the backup member 13, and both are guided by separate guide mechanisms, even if the wedge body 9 and the transmission member 11. Even if the backup member 13 etc. are worn out, the effect is not directly transmitted to the movable mounting base 8, and product accuracy is hardly affected. The presence of the buffer material 12 allows the transmission of the acting force to be averaged over the contact surface, thereby further eliminating the influence of wear.

The apparatus of the embodiment described above has _an extremely simple structure and can be made compact, lightweight, and _inexpensive . ₃ , _P4 can be specialized for each part and installed on site. In other words, on the line side where press parts are required, it becomes possible to produce the required quantity at the required time. Furthermore, by using the surplus man-hours on the line, it is possible to reduce the number of man-hours required for machining, and since it is a dedicated machine, there is no need to change molds. In other words, by adopting an inexpensive dedicated press machine, the number of man-hours for changing molds is eliminated, lot production of parts is eliminated, and therefore there is no need to keep inventory of parts, which also has the effect of eliminating parts storage warehouses. be.

In the above explanation, the electric motor 18 and the worm speed reducer 16 are used as the drive mechanism to achieve a compact, lightweight, and inexpensive structure, but the present invention is not necessarily limited to this, and the present invention is not necessarily limited to this, and may be implemented using a hydraulic cylinder or other device. A driving source may also be used.

Furthermore, in this embodiment, the fixed mold 4 is fixed to the upper part of the frame and the movable mold 7 is pushed up from below by a wedge body 9 or the like, so that the mold can be opened using gravity. It is also possible to create a structure in which the fixed mold is fixed at the bottom and the movable mold is lowered from above. In this case, a spring or the like is used to open the mold. Note that the movable moving mechanism may be moved diagonally or laterally instead of vertically.

Furthermore, the inclination of _the wedge body 9 is such that _the lower surface is θ ₁ and the upper surface is θ ₂ . Although shown and explained, it is of course possible to set θ ₂ =0.

As detailed above, the present invention utilizes the increase in the force ratio of the wedge to exert a large press capacity with a small force, and also makes it possible to provide a compact, lightweight, and inexpensive press with a simple structure. For example, if this press is applied as a dedicated press machine on the line side of a mass production factory, there will be no need to change molds.
Since lot production is not performed, there is an excellent effect that parts inventory can be eliminated and surplus man-hours on the line can be used for press work.

Moreover, in the present invention, the movable mold and the transmission member that transmits the driving force to the movable mold are guided by separate first guides and second guides, and there is a small distance between the transmission member and the movable mold. Since the wedge press is equipped with a cushioning material that transmits force while allowing relative movement, it has the effect of extending the life of the wedge press.

In order to obtain a large boosting effect using the wedge action, it is necessary to bring the wedge body into surface contact with the transmission member and the second plate-shaped body, but in this case, the sliding movement of each of these members It is inevitable that the surface will wear out,
If the wear of this sliding surface were to directly lead to a decrease in the relative positional accuracy between the fixed and movable dies, the life of the wedge press would be shortened, but this problem can be resolved as described above. It can be done. Even if the sliding surfaces of the wedge body, transmission member, and second plate-like body wear out and the end face of the transmission member on the movable die side becomes slightly inclined during operation, this inclination is absorbed by the cushioning material and the second This is because the movable mold guided by one guide can maintain an accurate relative position with respect to the fixed mold.

Furthermore, when the wedge body is inserted into the wedge-shaped space formed between the transmission member and the second plate-shaped body, a force in the direction of movement of the wedge body acts on the transmission member. This force is received by the second guide and is hardly transmitted to the movable mold, so no large force is applied to the surface of the first guide that guides the movable mold, and the wear of the first guide itself is also reduced. As a result, the relative positional accuracy between the movable mold and the fixed mold does not deteriorate, which also improves the durability of the wedge press.

[Brief explanation of the drawing]

FIG. 1 is a front view of a wedge press that is an embodiment of the present invention. FIG. 2 is a front cross-sectional view of a main part of the reducer used in the wedge press shown in FIG. 1, and FIG. 3 is a cross-sectional side view of the main part. Figure 4 is an explanatory diagram regarding the wedge angle of the wedge body shown in Figure 1, Figure 5 is a graph of input Q and output F with the wedge angle as a parameter, and Figure 6 is a graph of the friction coefficient as a parameter. This is a graph of input Q and output F. FIG. 7 is an assembly line layout diagram of a mass production factory using the wedge press according to the present invention. 1...Bed, 2...Side frame, 3...
Crown, 4...Fixed type, 5...Fixed type mounting base,
6... Rod, 7... Movable type, 8... Movable type mounting base, 9... Wedge body, 10, 14... Guide piece,
11... Transmission member, 12... Cushioning material, 113...
Backup member, 15... Backup plate, 16... Reduction gear, 17... Stopping plate, 18
... Motor, 21 ... Case, 22 ... Screw shaft, 23 ... Screw nut, 24 ...
...Worm foil, 25...Spacer ring, 2
6... Bolt, 27... Conical roller bearing, 28...
Worm, 29... Thrust bearing, 30... Double chamfered portion, Q... Input, F... Output, P ₁ , P ₂ , P ₃ ,
P ₄ ...wedge press.

Claims (1)

[Claims for Utility Model Registration] A frame formed by connecting first and second plate-like bodies arranged opposite to each other so that their relative positions remain unchanged by a connecting member; and the first plate-like body; a fixed mold that is fixed; a movable mold that is movable in a direction perpendicular to the fixed mold and immovable in a parallel direction and guided by a first guide; and a movable mold that is guided behind the movable mold in the same direction as the movable mold. a wedge shape that is movably guided by a second guide different from the first guide, and has a gap between it and the second plate-shaped body that gradually decreases in a direction substantially perpendicular to the direction of movement of the movable mold; a transmission member forming a space; and a transmission member disposed between the transmission member and the movable mold, transmitting the force transmitted by the transmission member to the movable mold while allowing minute relative movement between the two. a cushioning material; a wedge body that is slidably inserted into the wedge-shaped space and makes surface contact with the transmission member and the second plate-shaped body; and a wedge body that is attached to the frame and that connects the wedge body to the gap. A wedge press characterized by comprising: a drive mechanism that moves forward and backward in a direction in which the pressure changes;