JPH09216100A - Mechanical press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable adjusting the stroke of a press in a crank shaft when the press is started by stopping rotation between an eccentric bushing and a press connecting member by connecting both of them and enabling the rotation of the 2nd eccentric member in the 2nd eccentric bushing. SOLUTION: In operation of a usual press, when the crank shaft 14 is rotated, the eccentric bushing 20 is held in a prescribed place of the eccentric part of the crank shaft by press-fixing in the vicinity of the eccentric part of the crank shaft or interference adaptation and, thus, sufficient torque to execute striking or forming motion is transmitted. When oil is supplied to smooth the rotation of the eccentric bushing 20 to a connecting part 10, an oil film on which the eccentric bushing 20 is rotated is formed by passing through a conduit pipe through the head part of the connecting part or the like and flowing into a clearance 26 in the radial direction. The crank shaft 14 and its eccentric bushing 20 revolved together are revolved to the connecting part 10, so the reciprocating motion of a slide is generated.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to stamping and drawing presses, and more particularly to an apparatus for adjustable stroke connection for adjusting the stroke length of a press slide. is there.

[0002]

2. Description of the Related Art In mechanical presses, it is often desired to adjust or change the stroke length of a reciprocating member such as a slide for mounting a stamp tool. In some toothed adjustment systems based on the prior art, system components tend to wear out after a period of service. It would be desirable to provide a device or system that allows the stroke length of a slide or other component to be adjusted quickly, easily and accurately.

[0003]

SUMMARY OF THE INVENTION The present invention provides a double eccentric adjustable stroke connection system for use in changing the stroke length of a slide or other member of a mechanical press.

An eccentric bush is arranged on the eccentric portion of the rotary crankshaft. Press connecting members such as connecting rods and links are mounted around the eccentric bush. During normal operation, there is relative movement between the eccentric bush and the connecting member or arm, which results in a reciprocating movement of the press slide. During stroke adjustment,
Pressurized oil is passed between the eccentric bush and the eccentric part of the crankshaft, thereby releasing the press fit and interference fit between them, expanding the eccentric bush and connecting it. Form a temporary crimp connection with the arm. At the same time, the crankshaft is rotated along the eccentricity, which makes it possible to change the eccentric position in the eccentric bush. This causes a change in stroke length. When the hydraulic pressure is then released, the eccentric bush contracts again to form a crimp or interference fit with the crankshaft press eccentric, releasing the temporary crimp connection between the outside of the eccentric bush and the connecting member or arm. When such high hydraulic pressure is reduced, normal press operation proceeds.

[0005]

According to one aspect of the present invention, there is provided a press connecting member, an eccentric bush arranged in the press connecting member, and a second eccentric member arranged in the eccentric bush. It comprises a mechanical press having a second eccentric member releasably connected thereto. The rotatable crankshaft is connected to the second eccentric member. The present invention connects the eccentric bush with a press connection member to prevent rotation between the two and to allow rotation of the second eccentric member within the second eccentric bush, thereby activating the means. Includes means for enabling the crankshaft for press stroke adjustment.

The invention also provides a coefficient of friction disposed between the second eccentric member and the eccentric bushing to prevent rotation of the eccentric bushing with respect to the second eccentric member before a temporary crimp connection is made. Includes a high friction seal.

According to another aspect of the present invention, a fluid pressure means for connecting an eccentric bush with a press-joining member to prevent rotation between the two and to allow a second eccentric member in the eccentric bush to rotate. Composed by. The fluid pressure means includes a fluid path through the interior of the crankshaft that communicates with fluid pressure boosting means to increase fluid pressure through the path within the crankshaft. In one form of the invention, the pressure boosting means comprises a movable piston for increasing the fluid pressure in the crankshaft path.

One advantage of the present invention is that the mechanical press now has a simple and compact stroke adjustment connection that is operated by fluid pressure. In prior art stroke adjustment connections, keys and / or gears were used between the crankshaft and the various eccentrics. The present invention provides a connection that is simple in design and that significantly reduces the components required for the stroke adjustment mechanism.

Another advantage of the present invention is the use of a simple stroke adjustment connection to enhance the functionality of the press while at the same time
That is, a significant cost reduction can be obtained. Moreover, the maintenance costs of the adjusting and replacement parts are reduced compared to conventional adjusting stroke connections.

Yet another advantage of the present invention is provided by the fluid pressure boosting means, which, despite being located within the crankshaft of the press, achieves a high rate of fluid pressurization. The novel fluid intensifier according to the invention is simple in construction and operation and only requires a rotary sealing system.

The above-described and other features and advantages of the present invention, and methods for achieving the same, will be further understood by referring to the following description of the embodiments of the present invention and the accompanying drawings. Will be understood.

In these figures, the same reference numerals are used for corresponding parts. Although these drawings show embodiments of the present invention, they are not to scale and
Certain features have been exaggerated or omitted for the sake of clarity and explanation of the present invention.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The adjustable stroke connection of the present invention is suitable for a variety of stamping press configurations. Prior art mechanical presses 110 (FIG. 9) generally include a crown 115, a floor 1 having a bolster assembly connected thereto.
17 and a vertical portion 113 connecting the crown 115 with the floor 117. The vertical portion 113 is connected to or integrated with the lower side of the crown and the upper side of the floor. The slide 119 includes the vertical portions 11
It is arranged between the three to perform a reciprocating motion induced with respect to the floor. Ties that extend inside the top, vertical part and floor.
Rods (not shown) are attached to each end with tie rod nuts. The leg members 118 are formed as an extension of the floor and are typically attached to the work floor by shock absorbing pads.

A drive mechanism 114 for the press is provided to drive the reciprocating motion of the slide 119. A suitable mechanism is an auxiliary flywheel 1 mounted on the crown 115.
Drive motor 116 mounted by a belt on 20
have. The auxiliary flywheel 120 is the main flywheel 112.
The main flywheel 112 is selectively engaged by the clutch of the combined clutch / brake mechanism to drive the rotation of the press crankshaft 14, which press crankshaft 14 connects the slide and the crankshaft. Initiate a sliding movement through a connection extending between them. The description of the press 110 and its drive mechanism is merely exemplary. Various mechanical presses are well known in the prior art and the present invention can be used with any mechanical press that uses a crankshaft type device to effect the reciprocating motion of the press members. An example of a mechanical press is disclosed in US Pat. No. 5,189,928 entitled "ADJUSTABLE STORKE PUNCH", which patent is incorporated herein by reference.

Referring now to FIG. 1, there is shown a perspective view of a portion of the crankshaft, its associated eccentric bush, and the connecting portion driven by rotation of the crankshaft. The connection may be formed by a bottom and a head, the bottom of the connecting member 10 being generally attached to the press slide in a suitable manner. The crankshaft 14 includes a cylinder main portion 16 centered on a rotation axis of the crankshaft, and a cylinder eccentric portion 18 rotatably fixed to or integrated with the cylinder main portion 16.
Have a second eccentric member such as. Although only one crankshaft eccentric portion is shown, a plurality of eccentric portions are arranged along the axial direction of the crankshaft 14 when corresponding to another connecting portion (not shown).

The ring-shaped crankshaft eccentric portion 18 is
The eccentric bush 20 made of bronze. 2 (a), (b) and FIG. 3 show the structure of these parts well, in which the crankshaft main part is shown in broken lines. During normal press operation, as the crankshaft 14 rotates, the eccentric bushing 20 is held in place on the crankshaft eccentric portion 18 by crimping or interference fitting around the crankshaft eccentric portion at 22 (ie, it). With it), which imparts sufficient torque to perform a stamping or molding operation. Oil is supplied in order to smooth the rotation of the eccentric bush 20 with respect to the connecting portion 10. For example, the oil may pass through the conduit head through the connection head or cap of the connection into the radial gap of 0.003 "to 0.005", causing the eccentric bushing 20 to rotate over the oil film. Form. FIG. 4 (a)
Show how at pressures such as 125 p.si, oil is transmitted through the hose 25 and the conduit 24 to the radial / drive gap 26 to lubricate the movement of the connection. In this operation, the conduit and the eccentric portion shown by the broken line in FIG. 4 (a) in the crankshaft 14 are not used in a method of causing stroke adjustment as described below. Since the crankshaft 14 and its co-rotating eccentric bush 20 rotate with respect to the connecting portion 10,
The connecting portion 10 moves up and down to cause the slide 119 to reciprocate.

When it is desired to change or adjust the stroke of the slide 119, the rotation of the crankshaft 14, and hence the movement of the slide, is stopped, and the joint 10 is stopped.
The oil supply from the conduit 24 at the head of the machine is stopped. After that, the high-pressure oil is supplied to the inside of the eccentric bush 20 through the crankshaft 24 through the shaft hole 28 and one or more lateral holes 29. The pressure of the high-pressure oil is preferably between 7,000 p.si and 10,000 p.si, but is not limited to this and is distributed on the outer peripheral portion of the crankshaft eccentric portion 18. To prevent the high pressure oil from escaping, for example, bushing 20
Seals 100, 102 may be provided along the axial ends of the inner diameter of the. High pressure oil expands the bush 20 into a circular shape,
It shows a tendency to release the pressure contact between the crankshaft eccentric portion 18 and the eccentric bush 20. The high-pressure oil creates a small radial gap between the eccentric portion 20 and the crankshaft eccentric portion 18 at the position of 31, and forms a circumferential gap between the eccentric bush 20 and the connecting portion 10, and temporarily at the position of 33. Create a crimp or interference fit situation (see also Figure 4 (b)). The lubricated radial gap 31 allows the crankshaft 14 to rotate with respect to the eccentric bush 20, which does not rotate due to temporary compression with the connecting member 10. When the crankshaft 14 rotates, the main part 16 of the crankshaft will move to the eccentric bush 2.
It can be moved to a different position relative to 0, thereby effectively changing the stroke length of the joint 10 to the desired length. When the adjustment is completed, the supply of the high pressure oil supplied through the crankshaft 14 at the position 31 is stopped,
The eccentric bush 20 returns to the crimped state with the crankshaft eccentric portion (second eccentric member 18) due to the restoration of its metal structure, and the connecting portion reciprocates, whereby the stamping operation is continued.

2 (a) and 2 (b) show how the eccentric bush 20 and the crankshaft 14 are rotated by 180 degrees, and are shown for a 2.5 "stroke length. Of course, other stroke lengths are possible within the scope of the invention.

FIG. 5 discloses another embodiment of the present invention, which illustrates a stamping operation. In this embodiment, an additional connecting bush 11 is interposed between the connecting part 10 and the bush 20, and the connecting bush 11 is joined to a circumferential groove arranged radially outside the eccentric bush 20. It Oil is a radial gap 2
Introduced into 6, it forms an oil film and allows free rotational movement of the crankshaft with its eccentric bush connection 10 and its associated bush 10.
In this embodiment, the seal 35 prevents the high pressure oil from escaping between the crankshaft eccentric portion 18 and the eccentric bush 20. During the stroke adjustment, high pressure oil is supplied from the plurality of lateral holes 29 through the axial bore 28. The shaft hole 28 further extends along the axial length of the crankshaft to each connection portion through the crankshaft.

Since the shaft hole 28 has an "oval shape", it prevents the eccentric bush 20 and releases the pressure, so that the crankshaft eccentric portion 18 and the eccentric bush 20 are released as described above.
The shape of the eccentric bush 20 has been enlarged in order to reduce the pressure-bonding to and can be used.

For example, FIG. 6 (a) is an axial sectional view of an eccentric bush, in which the eccentric lobe portion 40 has an internal cavity 41 (cavity) in fluid communication with an eccentric bush internal opening 43 for receiving the crankshaft eccentric portion 18. Have When the high-pressure oil is introduced into the crankshaft eccentric part around the circle, the high-pressure oil is forced to move outward in the radial direction (arrow 4).
2), the force of which acts in the lobe recess as shown. FIG.6 (b) is sectional drawing,
6A is conceptually similar to the axial cross-section of FIG. 6A, the outer lobe portion of which has a central rib 45
It has a beam-type structure. The force produced by the high pressure oil is shown again at 42. FIG. 6 (c) shows the eccentric bush shown in the side view of FIG. 6 (b), and the eccentric lobe is shown including a rib 45 which is recessed from the axial end of the eccentric bush. There is. FIG. 6 (d) discloses an axial sectional view of yet another embodiment, showing an eccentric bush 20.
The eccentric lobe 47 of is hollow.

FIG. 7 illustrates yet another aspect of the present invention in which a conventional rotating union rather than a special high pressure rotating union is used to introduce high pressure oil used to expand the eccentric bush. be able to. Most of the embodiments shown in FIG. 7 are conceptually similar to the embodiments described above. The cylindrical crankshaft eccentric portion 52 is integrated with the crankshaft main portion 50, and is surrounded by an eccentric bush 54 which is crimped onto the eccentric portion 52 at a position of 55. The connecting bush 56 surrounds the eccentric bush 54 and is at position 60.
Are arranged with a small radial interval. The connection bush 56 includes a connection head 63 and a connection bottom 62.
It is crimped inside the opening provided between and and attached to the press / slide.

The inner cavity 65 is the crankshaft main portion 50.
From the crankshaft eccentric portion 52, and a lateral bore 67 extends radially through the crankshaft eccentric portion 52. The axial bore 65 extends to the left, in FIG. 7, towards the other connection. High pressure oil can be transferred to the eccentric bush 54 without introducing it from the rotating union to the crankshaft.
In order to be able to use it to spread
A 10: 1 (and so on) ratio booster is provided. A booster rod or plunger 69 is disposed inside the end of the shaft hole 65, is sealed by a seal 70, and is disposed in the inner groove of the crankshaft. The seal can also be a tatami mat mounted on the plunger 69. The plunger 69 is terminated by a piston 72 whose circumference is sealed. For example, 1,000p.si
At the pressure of 7
6 and chamber 78, where it acts on piston 72 to drive plunger 69 to the left. Air passes through vent 79 while the plunger is operating.

The plunger 69 has a cross-sectional area, such as one-tenth of the cross-sectional area of the piston 72, so that the oil already inside the axial hole 65 and the lateral hole 67 is generated by operating the piston. It is boosted to about 000p.si. The piston and plunger are designed with sufficient stroke to displace the oil to expand the eccentric bushing of all connections. The seal 81 prevents oil from escaping or leaking from the sealing system as the high pressure oil inside the lateral hole 67 flows into the inner diameter recess of the eccentric bushing and radially expands the bushing.

FIG. 8 is a partial axial cross-sectional view showing another method for sealing high pressure oil used to expand the eccentric bush. In this embodiment, the eccentric bush 86
An O-ring face seal 84 mounted above cooperates with the radially aligned walls of ribs 88 projecting from crankshaft eccentric 90. Further, a seal portion may be arranged on the rib 88 to prevent oil leakage. Other seal configurations may be used within the scope of the invention.

The present invention includes two seals 100 and 102 (see FIGS. 1 and 10) made of a high coefficient of friction material which, when under pressure, both the eccentric bush 20 and the second eccentric member 18. Creates a holding force or mechanism to engage one another until a crimp or interface fit occurs in the gap 26 between the connection 10 and the eccentric bush 20.

The clutch torque while the crankshaft 14 is rotating must overcome the high coefficient of friction created thereby between the eccentric member 18 and the eccentric bush 20. This feature allows multiple eccentrics to be at the same angle at the same time, without the need for mechanical teeth, sprockets, or other mechanisms to ensure proper timing or offset from each other. This sealing configuration, together with a high coefficient of friction, further reduces parts and simplifies the design.
No other mechanical parts are needed to properly hold the positions of the eccentrics relative to each other, thus allowing the slides to remain parallel after the press stroke change is complete. .

Yet another feature of the present invention is that the same adjustable stroke connection between the crankshaft and the balancer may be used, thereby maintaining press balance. Therefore, the type of joining member that can be utilized in the present invention may be a conventional connecting arm or other link to a pressed part, such as a dynamic balancer.

Although the adjustable stroke mechanism of the present invention uses a single oil path through the crankshaft, it may have two different oil paths from opposite sides, one of which is in accordance with the present invention. The adjustable stroke connection mechanism may be activated and the other path may activate stroke adjustment for the balancing arrangement.

One type of seal that has been found useful in the present invention is the U-type seal. This type of seal operates by the action of internal fluid pressure which spreads the lip of the seal. By this movement, a braking force is generated between the eccentric portion and the journal portion, and a tightening force is formed. U-cups or U-shaped seals have been shown to work better than any other type of seal ever used.

FIG. 10 shows a typical U-shaped seal (100, 102) when pressure is applied between two eccentric members.
Is shown. The tightening force increases with increasing pressure. The holding force is therefore easily actuable, whatever the torque required by the device.

While the present invention has been described above on the premise of having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. Therefore,
Therefore, this application includes within its scope modifications, uses, or applications using its basic principles. Further, in the present application, such differences from the present disclosure are within the scope of those skilled in the art to which the present invention pertains, and are included within the scope of the appended claims.

[Brief description of drawings]

FIG. 1 is a partially cutaway overhead view of a crankshaft and a slide connecting portion.

2 (a) and 2 (b) are two cross-sectional views of the crankshaft and the eccentric bush at maximum and minimum stroke positions respectively, with the connections shown in elevation and for lubrication. No oil groove or crankshaft adjustment mechanism is shown.

FIG. 3 is an enlarged view of the crankshaft and eccentric bush of FIG. 2 (a).

4A and 4B are axial cross-sectional views schematically showing another time zone of the operation, that is, a normal stamp operation and a stroke length / eccentricity adjustment, respectively. Is.

FIG. 5 is an axial cross-sectional view of another embodiment of the present invention showing an eccentric bush and another connecting bush between its connections, showing an oil conduit for crankshaft adjustment.

FIG. 6 (a) is an axial sectional view of a first eccentric bush, and FIGS. 6 (b) and 6 (c) are axial sectional views and side views of another eccentric bush, respectively. Yes, FIG.6 (d) is an axial sectional view of another eccentric bush.

FIG. 7 is an axial cross-sectional view of one embodiment of the present invention showing a suitable method of supplying high pressure oil to a crankshaft that does not have a high pressure rotating union.

FIG. 8 is a schematic partial cross-sectional view of a second seal structure for sealing high pressure oil between the eccentric bush and the crankshaft eccentric portion.

FIG. 9 is an elevational view of a standard mechanical press to which the present invention has been applied.

FIG. 10 shows diagrammatically a cross-sectional view of one of the U-shaped seals according to the invention.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Richard Jay. Owen USA, 45895 Ohio, Wapa Connecta, Freiburg Drive 15523 (72) Inventor Edward A. Daniel United States, 45845 Ohio, Ft. Loreimy, Holthouse Road 9300

Claims (15)

[Claims] 1. A press connecting member, an eccentric bushing disposed inside the press connecting member, a second eccentric member disposed in the eccentric bushing and detachably connectable to the eccentric bushing, and A rotatable crankshaft connected to the two eccentric members and, when actuated to effect the press stroke adjustment, connect the eccentric bush to the press connecting member to prevent mutual rotation. And a means for allowing the second eccentric member to rotate within the eccentric bushing, thereby allowing the crankshaft to rotate. 2. A fluid pressure applied to the contact surface between the second eccentric member and the eccentric bush to allow relative rotation between the second eccentric member and the eccentric bush. The press according to claim 1, which is a constituent element. 3. The connecting means is hooked on a contact surface between the second eccentric member and the eccentric bush so that the eccentric bush and the press connection portion are connected to each other in a temporary crimp connection state. The press according to claim 1, wherein 4. A press as claimed in claim 3, characterized in that the means operate via the crankshaft. 5. At least one high friction seal disposed between the second eccentric member and the eccentric bushing is provided before the temporary crimp connection occurs. The press of claim 3, wherein the eccentric bushing prevents the eccentric bushing from rotating relative to the second eccentric member. 6. The press according to claim 5, wherein the high-friction seal is a U-shaped seal. 7. A press as claimed in claim 1, characterized in that the means operate via the crankshaft. 8. The eccentric bushing includes an internal recess communicating with the second eccentric member.
Press described in. 9. The press of claim 1, wherein the eccentric bushing includes I-beam ribs in its cross section. 10. A press connecting member, an eccentric bushing arranged inside the press connecting member, a second eccentric member arranged in the eccentric bushing and detachably connectable to the eccentric bushing, A rotatable crankshaft connected to the second eccentric member, and the eccentric bushing connected to the press connecting member to prevent rotation between the two, and at the same time the second eccentric member is the eccentric bushing. Fluid pressure means for allowing rotation therein, including a fluid path leading into the crankshaft and in communication with a fluid pressure booster for increasing fluid pressure through the crankshaft path. A mechanical press composed of means. 11. The press of claim 10, wherein the fluid intensifier includes a moveable piston for increasing fluid pressure in the crankshaft path. 12. The fluid pressure means is applied between the second eccentric member and the eccentric bushing so that the pressure causes relative rotation of the interface between the second eccentric member and the eccentric bushing. 11. A press according to claim 10, characterized by a fluid pressure enabling component. 13. A fluid for applying the fluid pressure means to a contact surface between the second eccentric member and the eccentric bush so that the advanced bush and the press connection portion are connected by a temporary crimp connection. The press according to claim 10, wherein pressure is a component. 14. At least one high friction seal is provided between the eccentric member and the eccentric bushing, whereby the high friction seal is provided relative to the second eccentric member of the eccentric bushing. 2. The relative rotation is prevented before the mechanical pressure bonding state occurs.
The press according to item 3. 15. The press according to claim 14, wherein the high-friction seal is a U-shaped seal.