JP2787947B2 - Toggle press equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toggle press device, and more particularly to an improvement in a toggle press device capable of simultaneously performing both a forming press such as drawing and a punching press.

[Conventional technology]

2. Description of the Related Art Conventionally, as a device for forming and punching a rim, a web, and the like of a brake shoe, a direct-type press device for directly moving a mold up and down by a vertical cylinder output has been widely used. Since this type of press apparatus has a configuration in which the pressing force of the die is directly obtained by the pressing cylinder, the size of the pressing apparatus is determined only depending on the output of the pressing cylinder. Therefore, the press device had an output of several hundred tons, and had a bulky device structure. On the other hand, a toggle press device is known as a device that generates a small, high-load press. This is achieved by connecting a crank mechanism or the like that bends and stretches to the intermediate shaft of a toggle link that is fixed at one end and is capable of bending and stretching, and applies a large force generated at the sliding end when the toggle link becomes straight. It was used for

By the way, when forming and punching a rim and a web of a brake shoe for a vehicle by the above-described conventional press device, a coil-shaped strip material is fed out from a recoiler and supplied to the press device. Drilling and overhanging were carried out step by step, and a processing procedure was used to finally punch out the outer shape. Specifically, as shown in FIG. 14, the forming and punching of the rim of the brake shoe is composed of six steps, and when the rim is first supplied to the press device, a hole 1, an overhang 2, and a stamp 3 are formed.
Through the first step of forming the second step, the second step of the idle, the third step of forming the small overhang 4, the fourth step of forming the small hole 5, the fifth step of the idle, and the sixth step of punching the outer shape. The rim was pressed.

[Problems to be solved by the invention]

However, in the method of progressive blanking of a material by the above-described conventional press apparatus, the number of processing steps is extremely large because several steps are required for forming and punching a single product. There has been a problem that the processing accuracy is reduced due to a material feed pitch error.

SUMMARY OF THE INVENTION An object of the present invention is to provide a toggle press device capable of performing high-efficiency press working by reducing the number of working steps of forming and punching, focusing on the above conventional problems.

[Means for solving the problem]

In order to achieve the above object, a toggle press device according to the present invention connects a fixed shaft and a ram connection shaft by a toggle link, and drives an intermediate shaft located in the middle of the toggle link to bend and extend the toggle link. In a toggle press device for driving an intermediate shaft of a toggle link to bend and extend the toggle link, a connection between an intermediate shaft constituting the toggle link and upper and lower links and intermediate links above and below the toggle link is formed by the upper part. An arcuate groove formed on the surface of the link and the intermediate link facing the intermediate shaft is brought into contact with the outer peripheral surface of the intermediate shaft by abutting against the outer peripheral surface of the intermediate shaft. In this case, the toggle link is characterized in that the upper link and the intermediate shaft, and the intermediate shaft and the intermediate link, which constitute the toggle link, are connected and connected by a connection plate provided at an end.

[Action]

The operation of the invention having the above configuration is as follows. First,
In the first invention, a pressurizing cylinder is connected to drive means for applying a press working operation to the toggle link to which the ram is connected, and the bending and extension movement of the toggle link is performed by a stroke by the cylinder. Since the forward stroke or the backward stroke of the cylinder is configured to pass through the idea of the toggle link, the cylinder 1
The reciprocating operation of the ram can be performed in two strokes (one reciprocation), the number of operations of the pressure driving source is reduced, and high-speed press working can be performed. Further, the pressing force of the toggle press device depends on the size of the contact area between the support shaft and the link connecting the support shaft. According to the second invention, the pair of links do not completely cover the support shaft, Are pressed against each other so as to be in surface contact with each other, so that the load transmission area is doubled as compared with the case of the enveloping connection. Therefore,
A large press load can be taken, and a high-load press structure can be provided while having a low pressure input. Furthermore, in the third invention, since the ram itself that is operated to be lowered by the toggle link is further provided with a built-in cylinder mechanism, a two-action pressing operation can be performed in one step of the ram. Therefore, a single descending operation can perform a forming process such as drawing and a plurality of processes such as punching, overhanging, engraving, and punching in the same process, thereby reducing the number of processes. is there. In particular, in this case, since the process shifts to the punching process at the same place after the completion of the molding, the position of the material can be maintained until the punching process, and the punching process with high precision is performed.

〔Example〕

Hereinafter, embodiments of the toggle press device according to the present invention will be described in detail with reference to the drawings.

The toggle press device according to the embodiment has a press frame 10
An upper fixed shaft 2 fixed and supported horizontally, a middle intermediate shaft 14 arranged in parallel with the upper fixed shaft 2, and a lower ram connecting shaft are provided as rotating shafts. In addition, the shafts 12, 1
Between the 4 and 16, the upper link 18 of the thick flat plate, the intermediate link 20,
And the slider link located below the ram connecting shaft 16
22 are arranged, and a toggle link mechanism is configured by a combination of these links and the shaft.

The upper link 18 is rotatably mounted on the boss portion so as to be rotatable around the fixed shaft 12 through the fixed shaft 12.
The intermediate shaft 14 is located between the upper link 18 and the lower intermediate link 20, and the intermediate shaft 14 is joined and connected to the upper link 18 and the intermediate link 20 in a surface contact state.
That is, large-diameter portions 24 are formed on the lower surface of the upper link 18 facing the upper surface of the intermediate shaft 14 and the upper surface of the intermediate link 20 facing the lower surface of the intermediate shaft 14, respectively. Are the sliding members 63 mounted on these large diameter portions 24, 24.
The surface is joined to the outer peripheral surface of the intermediate shaft 14 through the connecting plate 42, and the connected state is maintained by the connecting plate 42.

The intermediate shaft 14 has a double shaft structure, and as shown in FIG. 8, a central shaft 26 and a pair of mantle shafts 28 for inserting the central shaft 26.
Consists of The pair of mantle shafts 28 are located near both ends of the center shaft 26, and a drive block 34 attached to the tip of the rod 32 of the hydraulic cylinder 30 for driving the toggle link is disposed between the mantle shafts 28. . The drive block 34 is a rectangular parallelepiped block, and the center shaft 26 passes through the drive block 34 while being sandwiched between the mantle shafts 28. The stroke of the rod 32 extended and contracted by the hydraulic cylinder 30 is a horizontal direction orthogonal to the axis of the intermediate shaft 14, thereby moving the intermediate shaft 14 and pressing the toggle link so as to impart bending and stretching motion to the toggle link. The operation is performed. Of course, the trunnion-type hydraulic cylinder 30 has its support shaft 35 attached to the press frame 10, and pushes and pulls the intermediate shaft 14 to
Is able to follow the arc movement of the intermediate shaft 14 caused by the rocking motion. Also, the upper link 18 and the intermediate link 20
A relief groove 36 is formed in a portion facing the drive block 34 in order to prevent interference with the drive block 34. In this case, the stroke amount of the rod 32 of the hydraulic cylinder 30 is set at an intermediate position from the maximum contraction position to the maximum extension position so as to pass a so-called thought point when the toggle links are linearly arranged. For this reason, the ram 38 is set so as to make one reciprocating motion in the going process or the returning process of the hydraulic cylinder 30.

The intermediate link 20 is further surface-bonded to the ram connecting shaft 16 located therebelow, so that the lower surface thereof has a sliding surface that matches the outer diameter of the ram connecting shaft 16 as well as the upper surface. The large diameter portion 24 that engages with the moving member 63 is formed.
Further, a slider link 22 joined to the ram connecting shaft 16 with a large-diameter portion 24 that also engages with the sliding member 63 is disposed on the lower surface of the ram connecting shaft 16, and a pressing operation is performed below the slider link 22. A ram 38 is provided for making. The ram 38 is guided by a sliding guide 65 attached to the press frame 10 so as to be able to move up and down, and is guided so as to move up and down as the ram connecting shaft 16 moves up and down.

Here, the intermediate link 20 and the ram connecting shaft 16 of the toggle link are connected to the upper link 18, the intermediate link 20, and the slider link 22 located above and below the sliding link 63, which engage with the large diameter portion 24, respectively. , The link engagement is disengaged as it is. In order to prevent this, a connecting plate 42 is used. This connecting plate 42
Are engaged with the central shaft insertion holes 39 opened at both ends of the intermediate shaft 14 and the slots 40 formed on the end surface of the ram connecting shaft 16 and are fixed to the respective links 18, 20, 22. I have. As shown in FIG. 9, the structure of the connection plate 42 has a fan-shaped flat plate 42A, which is formed upright from the fan-shaped flat plate 42A on the inner peripheral edge thereof, and has an inner diameter of the center shaft insertion hole 39 or the slot 40. An arc engagement piece 42B having an arc surface conforming to is provided. A bolt through hole 42C is formed in the outer edge of the fan-shaped flat plate 42A. In such a connection plate 42, the arc engagement piece 42B is inserted and held in the center shaft insertion hole 39 and the slot 40, and is fixed to the outer end face of each link through the connection bolt through the bolt through hole 42C. By doing so, the connection between the link and the shaft is maintained while securing the sliding at the joint surface.

Furthermore, the elastic deformation of the frame returns to its original state at the moment when the material is separated due to the total gap generated by each sliding portion during the punching process, which causes the punch edge of the mold to enter the die. In order to prevent the die from being worn or damaged, in this press device, an air chamber 46 surrounded by a slide guide 65 in the press frame 10 is formed on the lower surface of the slider link 22, and the air A constant pressure of compressed air is supplied to the chamber 46 from the air supply port 70. Therefore, the slider link 22 is lifted upward by the air pressure supplied to the air chamber 46, and the components of the toggle link can be brought into close contact with each other. The pressure supplied to the air chamber 46 is sufficient to bring each toggle link and each shaft into close contact.

A movable mold 47 is attached to the ram 38. The movable mold 47 includes a blank die 38 for punching an outer shape of a product from a processing material, a punch 50 for punching attached to the blank die 48, and a forming punch 52 for processing such as overhanging and engraving. It is composed of And
When the press is performed by the lowering operation of the ram 38, the movable mold 47 is configured to perform the forming process first, and then perform the punching and the blanking process. Therefore, the forming punch 52 is formed on the pressing surface of the blank die 48 by pressing. It is stored so that it can enter and exit from. That is, a forming cylinder 55 having a built-in forming piston 54 is formed on the ram 38, penetrates through the blank die 48,
The forming piston 54 and the forming punch are formed by a cylindrical forming punch mounting pin 56 having a large-diameter flange for suspension and a bolt that penetrates the center portion thereof and is screwed to the forming punch 52.
The lower portion of the forming punch 52 can enter and exit from the lower surface of the blank die 48 by the reaction force of a blank punch 62 described later with the reciprocation of the ram. A predetermined hydraulic pressure is constantly input to the hydraulic cylinder supply port 58 of the forming cylinder formed in the ram 38, and the forming piston 54 moves in and out of the ram 38 in conjunction with the bending / extending operation of the toggle link, thereby stretching the work material. Forming processing such as tapping processing is enabled. The punch 50 is slidably fitted in a hole penetrated by the forming punch 52 along the moving direction of the forming punch 52. Thereby, when the movable mold 47 comes into contact with a fixed mold described later, the molding punch 52 which is first pressed by the molding piston 54 and protrudes from the blank die 48 hits the processing material to form and process the toggle link. By further reducing the pressure by the operation, the forming piston 54 is pushed and the punch 50 is pushed toward the work material. As a result, drilling is performed. Then ram
By further lowering the blank 38, the blank die 48 integrated with the ram 38 is lowered to perform a punching process along the outer shape of the product.

On the other hand, opposed to the movable mold 47, a fixed mold 60 is installed on the base surface of the press frame 10, and by pressing the movable mold 47 against the fixed mold 60, the molding process is performed as described above. Drilling and punching are performed. The fixed mold 60 is attached to the base surface,
The blank punch 62 includes a blank punch 62 facing the forming punch 52 and a material receiving plate 64 located on a side of the blank punch 62. The material receiving plate 64 is supported by the cushion pins 66 to allow the blank punch 62 and the blank die 48 to escape the blank die 48 during shearing, and to push up the scrap.

The working material 68 is continuously supplied from the recoiler arranged on the upstream side of the press device to the strip between the movable mold 47 and the fixed mold 60. A cam 69 and a load sensor are provided between the upper link 18 of the toggle link and the upper beam of the pre-spray 10.
71 is attached to detect the press load.

The press operation by the press device thus formed is performed as follows. In advance, the rod 32 of the hydraulic cylinder 30 is maximally contracted so that the intermediate shaft 14 of the toggle link is separated from the plane connecting the fixed shaft 12 and the ram connecting shaft 16 so that the toggle link is bent. Further, a back pressure is applied to the forming piston 54 to make the forming punch 52 protrude. In this state the processing material 68
Is supplied between the molds 47 and 60.

From this state, when the hydraulic cylinder 30 is extended and the ram 38 is lowered so that the toggle link is on a straight line,
First, the forming punch 52 is pressed into contact with the processing material 68 on the blank punch 62, and a forming process such as overhang is performed. When the ram 38 is further lowered, the extension force of the toggle link overcomes the pushing force of the forming punch 52 by the forming piston 54, and the blank die 48 is lowered together with the ram 38, and the forming die is relatively moved.
Drilling punch 50 because 52 enters blank die 48
Protrudes from the forming punch 52, whereby a hole is formed in the processing material 68. Then, as the ram 38 further descends, the blank punch 62 of the fixed die 60 enters the forming punch 52 storage space of the blank die 48, and the blank die
A shearing action acts between the workpiece material 48 and the external shape of the product is punched from the processing material 68. In this state, the toggle links are in a linear arrangement.

Then, the rod 32 of the hydraulic cylinder 30 is further extended to allow the toggle link to pass through the conceivable point, and the ram 38 starts to move upward with the contraction of the toggle link, separating the movable mold 47 from the product and removing the mold. The punched product is pushed into the blank hole, and then a one-pitch feed is applied to the work material 68 to start the next press operation. This is followed by applying a retracting operation to the hydraulic cylinder 30 to perform similar processing.

According to the press device configured as described above, first, the hydraulic cylinder 30 for performing the press operation by giving bending and stretching motion to the toggle link is connected to the intermediate shaft 14 and one stroke passes through the idea of the toggle link. Therefore, one reciprocating operation of the ram 38 is performed by the extension operation or the retraction operation of the hydraulic cylinder 30, and one press operation is completed. For this reason, compared to the conventional case in which press work was performed only on one side of the toggle link, the hydraulic cylinder 30
Alternatively, the work amount of the means corresponding thereto is halved, and the effect of reducing the number of steps can be obtained.

Further, in this embodiment, the intermediate shaft 14 and the ram connecting shaft 16 are not boss-coupled to the upper link 18, the intermediate link 20, and the slider link 22, respectively, and have a connection configuration in which they are surface-joined by the large-diameter portion 24. Therefore, it is possible to increase the transmission area of the pressing force. In the conventional toggle press device, each shaft and link is a boss connection,
The bosses of the upper link and the lower link are fitted to the shaft, and the load transmission area had to share half of the shaft length with the upper and lower links. A transmission area can be provided. This makes it possible to generate a large press load while reducing the cross-section of the constituent members of the toggle link, thereby obtaining an effect that the press device can be significantly reduced in size.

Further, in the present embodiment, the forming cylinder 55
To form the molded piston 54, thereby forming the tenth
As shown in FIG. 13 to FIG. 13, the ram 38 is formed so that the forming process, blanking process, and drilling process are performed stepwise during one lowering operation of the ram 38, whereby the stroke of the ram 38 is applied to the workpiece 68 in one stroke. , And a blank and a hole can be formed, so-called one-step three-action processing can be performed. Moreover,
Since punching and drilling following forming are performed by continuously holding the work material 68 with the forming punch 52, there is no distortion of the product due to misalignment of the work material 68 at the time of processing, and there is also the advantage that processing accuracy is increased. can get.

Such a toggle press device not only performs the above-described press processing of the rim of the brake shoe, but also includes a disk pad,
It goes without saying that the present invention can be applied to various products such as a parking lever, an anchor plate, and a retainer plate.

〔The invention's effect〕

As described above, according to the present invention, the hydraulic cylinder performs the bending / extending operation of the toggle link, and the forward stroke or the backward stroke of the cylinder is caused to pass through the toggle link at the thought point. Can be driven at twice the speed of the operation of the input cylinder, and the number of machining steps can be reduced. Also, since the link and the shaft that constitute the toggle link are formed as a surface-joined structure so that the load transmission area can be increased, a small toggle press device of a low load and a high load type can be obtained. Since a built-in cylinder mechanism is provided to enable the forming process, the effect of greatly reducing the number of processing steps can be obtained.

[Brief description of the drawings]

FIG. 1 is an external perspective view of an essential part of a toggle press device according to an embodiment, FIG. 2 is a front view thereof, FIG. 3 is a side view thereof, FIG. 4 is a front view of a toggle link mechanism, and FIG. FIG. 6 is a partial sectional front view of a ram portion, FIG. 7 is a detailed sectional view of a mold portion, FIG. 8 is an exploded perspective view of an intermediate shaft, FIG. 9 is a perspective view of a connecting plate, 10 to 13 are partial front sectional views showing the operation of the mold, and FIG. 14 is an explanatory diagram of press working of a rim of a conventional brake shoe. 12 ... fixed shaft, 14 ... intermediate shaft, 16 ... ram connecting shaft, 18 ...
... Top link, 20 ... Intermediate link, 22 ... Slider link, 24 ... Circular groove, 26 ... Center shaft, 28 ... Cover shaft, 30 ...
... hydraulic cylinder, 34 ... drive block, 38 ... ram, 42
… Connection plate, 46… Air chamber, 54… Molded piston, 55… Molded cylinder, 47, 60… Mold, 58… Hydraulic oil supply / discharge port, 68… Processing material.

Claims (2)

(57) [Claims] 1. A toggle press device for connecting a fixed shaft and a ram connecting shaft by a toggle link, and driving an intermediate shaft of the toggle link to bend and extend the toggle link. The upper and lower links and the middle link are connected to each other by abutting an arcuate groove formed in a portion of the upper link and the intermediate link facing the intermediate shaft against the outer peripheral surface of the intermediate shaft, and by surface contact joining. Toggle press. 2. The structure according to claim 1, wherein the upper link and the intermediate shaft constituting the toggle link and the intermediate shaft and the intermediate link are connected and connected by a connecting plate provided at an end. The toggle press device as described.