JP7580974B2 - Press Equipment - Google Patents

Description

The present invention relates to a rotary cam press device that performs negative angle forming such as bending on a workpiece.

Conventionally, in press processing of automobile parts, etc., when negative angle forming such as bending is performed on a plate-shaped workpiece, a rotary cam type press device is used. A rotary cam type press device has a rotary cam with a roughly arc-shaped cross section that is rotatable on the lower die body. In a rotary cam type press device, after a negative angle is formed on the end of the workpiece by the processing cam, the rotary cam rotates relative to the lower die body to move the rotary cam away from the end of the workpiece, allowing the workpiece with the negative angle formed thereon to be removed from the die.

JP 2009-148798 A

As described above, in a rotary cam type press device, the rotary cam rotates relative to the lower die body to remove a workpiece that has a negative angle formed thereon. In this way, in a rotary cam type press device, the outer peripheral surface (sliding surface) of the rotary cam slides against the inner peripheral surface (sliding surface) of the lower die body.

For this reason, in rotary cam type press devices, maintenance is regularly performed, such as supplying oil to the sliding parts between the rotary cam and the die body. More specifically, in rotary cam type press devices, oil must be applied regularly during die maintenance to prevent malfunctions caused by seizure due to oil shortage.

In addition, the task of applying (supplying) oil to the rotary cam requires an operator to manually supply oil into the oil inlet, which increases the amount of work required. For this reason, there has been a demand for a structure that automatically supplies oil to the rotary cam to reduce the number of maintenance operations, or to supply oil during production to reduce malfunctions.

The present invention aims to provide a press device that can reduce the manual work of supplying oil to the rotary cam.

Here, we will explain in more detail the conventional oil supplying operation to a rotary cam. Conventionally, oil was supplied to the rotary cam by forming an oil groove (see oil groove 110 formed in rotary cam 100 in FIG. 7) on the sliding surface of the rotary cam, forming a through hole in the lower die body that reaches the oil groove, and flowing oil into the inlet of the through hole (oil supply port).

However, with the conventional method, the task of pouring oil into the oil supply port had to be done manually, which increased the number of work steps. There was also concern that dirt could get into the oil grooves formed on the sliding surface of the rotary cam, which could cause it to seize.

The inventors of the present invention have considered configurations to solve the above problems and have discovered that if a through hole that opens toward the rotary cam is formed in the lower die body, an oil supply device is attached to the through hole, and the contact part (ball) of the oil supply device comes into contact with the rotary cam to supply oil, then the oil can be automatically supplied by utilizing the rotation of the rotary cam.

(1) The press device of the present invention, which is provided based on the above findings, is a press device that includes an upper mold and a lower mold, the lower mold being provided with a lower mold body and a rotary cam, the lower mold body being provided with an oil supply device, the oil supply device including a contact portion that can come into contact with the rotary cam and an oil reservoir portion in which oil is sealed, and supplies oil from the oil reservoir portion to the rotary cam via the contact portion.

According to the press device of the present invention, oil can be automatically supplied by utilizing the rotation of the rotary cam. As a result, the press device of the present invention can reduce the number of manual maintenance tasks, such as manually supplying oil, and reduce labor costs. Furthermore, in the press device of the present invention, oil is supplied every time the rotary cam rotates. As a result, oil is supplied even during production, and malfunctions can be reduced. Furthermore, oil is supplied by rotating the contact part of the oil supply device in accordance with the rotation of the rotary cam, so a constant amount of oil can be supplied. In other words, the amount of oil supplied can be kept constant and excess oil supply can be suppressed.

Furthermore, the press device of the present invention does not require the provision of an oil groove for supplying oil to the rotary cam. This reduces the risk of malfunction due to dirt accumulating on the rotary cam. It also reduces the occurrence of burrs on the sliding surface of the rotary cam due to the oil groove.

(2) In the press device of the present invention, it is preferable that the oil supply device is disposed above the axis of the rotary cam.

The above-mentioned configuration allows the oil to flow from top to bottom. As a result, the oil can be applied to almost the entire rotary cam.

(3) In the press device of the present invention, a through hole that opens toward the rotary cam is formed in the lower die body, and the oil supply device is disposed in the through hole while being biased toward the rotary cam.

The above-mentioned configuration allows the rotary cam to maintain contact with the contact portion even when the rotary cam is displaced in the radial direction.

The present invention provides a press device that can reduce the need for manual oil supply to the rotary cam.

FIG. 1 is a schematic diagram showing a press device according to an embodiment of the present invention. 2 is a diagram illustrating an operation of the press apparatus of FIG. 1. FIG. 2 is a diagram showing an oil supply device of the press machine of FIG. 1 . 2 is a diagram showing a through hole of a lower die body of the press machine of FIG. 1 and a state in which an oil supply device is disposed in the through hole. FIG. FIG. 2 is a schematic diagram showing the arrangement of an oil supply device of the press machine of FIG. 1 . FIG. 2 is a diagram showing a main part of an oil supply device of the press machine of FIG. 1 . FIG. 13 is a reference diagram showing an oil groove formed in a rotary cam of a conventional press machine.

The press device 10 according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the press device 10 is equipped with a lower die 20, a lower die body 22, and a rotary cam 30. The press device 10 is a rotary cam type press device in which the rotary cam 30 is rotatable relative to the lower die body 22. As shown in FIG. 1, the press device 10 is also provided with an oil supply device 50, a processing cam 40, and a cylinder 42.

Although not shown in the figure, the press device 10 is provided with an upper die, and the processing cam 40 is pushed by a driver (not shown) that moves up and down in conjunction with the lifting and lowering of the upper die, and moves closer to the rotary cam 30.

In the following explanation, we will first explain the configuration and operation of the press device 10, and then explain the configuration and operation of the oil supply device 50.

As shown in FIG. 1, the rotary cam 30 is rotatably arranged on the lower mold body 22 so as to face the arc-shaped inner peripheral surface (sliding surface 22a). Also, as shown in FIG. 1, the lower mold body 22 is provided with a through hole (mounting portion 23) that opens toward the rotary cam 30 (formed to reach the rotary cam 30). To explain in more detail, as shown in FIG. 1, the lower mold body 22 is provided with a through hole that is inclined obliquely, and one end side of the through hole reaches a position facing the rotary cam 30. The through hole provided in the lower mold body 22 functions as the mounting portion 23 to which the oil supply device 50 is attached.

The rotary cam 30 is rotatably mounted so that its outer circumferential surface (sliding surface 30a) slides against the sliding surface 22a of the lower die body 22. As shown in FIG. 2(a), the rotary cam 30 is formed with a machining surface 32 for forming a negative angle (for bending) at the end of the workpiece W. The rotary cam 30 is capable of changing its rotation angle between a machining position P1 shown in FIG. 2(a) and a retreat position P2 shown in FIG. 2(d) by the operation of the cylinder 42. In more detail, the rotary cam 30 is rotatable between a position (machining position P1) where the machining surface 32 can come into contact with the workpiece W and a position (retract position P2) where the machining surface 32 is separated from the workpiece W.

As shown in FIG. 2(a), the tip of the processing cam 40 is provided with a processing blade 40a for pinching the end of the workpiece W between the processing surface 32 of the rotary cam 30 and performing a bent processing. The processing cam 40 can be displaced horizontally by being pushed by a driver (not shown) that moves up and down in conjunction with the upper die.

<About the operation of the press machine>
Next, a series of operations of the press device 10 will be described.

In the press device 10, the end of the workpiece W held by the lower die body 22 is sandwiched between the machining blade 40a of the machining cam 40 and the machining surface 32 of the rotary cam 30, so that a negative angle can be formed at the end of the workpiece W. Although not shown in the figure, when the workpiece W is set on the lower die body 22, the upper die descends and the workpiece W is sandwiched between the upper die and the lower die 20, and the workpiece W is formed.

As shown in FIG. 2(b), after the workpiece W is almost entirely formed, the machining cam 40 is pushed by a driver (not shown) and advances toward the rotary cam 30, and the tip of the machining cam 40 (machining blade 40a) is pressed against the machining surface 32, forming a negative angle at the end of the workpiece W. This forms a negative angle at the end of the workpiece W.

As shown in FIG. 2(c), after a negative angle is formed at the end of the workpiece W, the machining cam 40 retreats away from the rotary cam 30.

As shown in FIG. 2(d), after the machining cam 40 retreats, the cylinder 42 is actuated and the rotary cam 30 rotates from the machining position P1 toward the retreat position P2. That is, the rotary cam 30 rotates in a direction away from the workpiece W (first direction X1). As a result, the machining surface 32 of the rotary cam 30 moves away from the workpiece W, and the negative angle state of the end of the workpiece W is eliminated. Thereafter, the workpiece W with the negative angle formed therein is lifted upward and removed from the lower die 20.

Although not shown in the figure, after the workpiece W is removed from the lower die 20, the rotary cam 30 rotates in the direction opposite to the first direction X1 (second direction X2) and returns to the processing position P1 again, and then the next processing is performed.

In this way, the rotary cam 30 rotates from the processing position P1 toward the retreat position P2 (toward the first direction X1) each time processing is performed to form a negative angle at the end of the workpiece W, and then rotates again from the retreat position P2 toward the processing position P1 (toward the second direction X2). That is, the rotary cam 30 repeats the rotational movement between the processing position P1 and the retreat position P2.

<Configuration and operation of oil supply device>
Next, the configuration and operation of the oil supply device 50 will be described in detail with reference to the drawings.

As shown in FIG. 5, the press device 10 of this embodiment is provided with multiple (three in this embodiment) oil supply devices 50. The multiple oil supply devices 50 are arranged along the direction in which the axis of the rotary cam 30 extends (axial direction L).

As shown in FIG. 3, the oil supply device 50 includes a casing 51, a ball 52 (contact portion), an oil storage portion 54, a first biasing member 56, and a blocking body 58. As will be described later, the press device 10 is provided with a second biasing member 60 for biasing the oil supply device 50 and a blocking member 62 for blocking the mounting portion 23.

In the following description, the end of the oil supply device 50 on which the ball 52 is provided may be referred to as the "tip 50a," and the end opposite the tip 50a may be referred to as the "base 50b."

In the oil supply device 50, oil is sealed in the oil storage section 54, which is blocked by a blocking body 58. The blocking body 58 is biased by a first biasing member 56. The ball 52 is a spherical member that is attached to the tip of the oil storage section 54. The casing 51 has a portion (step portion 51a) with a different radial size formed in the middle of the longitudinal direction.

The inside of the casing 51 is hollow, forming an oil reservoir 54. Oil is sealed in the oil reservoir 54. The ball 52 is rotatably attached to the tip of the casing 51. The oil sealed in the oil reservoir 54 is pressed by a first biasing member 56 via a blocking body 58 made of a rubber material, and as the ball 52 rotates, the oil in the oil reservoir 54 is guided to the ball 52, making it possible to apply the oil from the tip 50a (ball 52). The oil supply device 50 is of the so-called cartridge type, which is reusable.

As shown in FIG. 4(b), the oil supply device 50 is disposed in the mounting portion 23 (through hole) of the lower mold body 22. More specifically, the oil supply device 50 is attached to the mounting portion 23 in an oblique orientation with the ball 52 (tip 50a) facing downward.

As shown in FIG. 4(b), the oil supply device 50 is disposed on the mounting portion 23 so that the ball 52 on the tip end 50a side is in contact with the outer circumferential surface (sliding surface 30a) of the rotary cam 30. As shown in FIG. 4(b), the second biasing member 60 is disposed on the base end 50b side of the oil supply device 50 on the mounting portion 23.

The mounting portion 23 is blocked by the blocking member 62 with the oil supply device 50 and the second biasing member 60 inserted. That is, the oil supply device 50 is inserted into the mounting portion 23 while being biased by the second biasing member 60 toward the tip 50a (toward the rotary cam 30). This maintains the ball 52 at the tip 50a of the oil supply device 50 in contact with the sliding surface 30a of the rotary cam 30.

As shown in FIG. 4(a), the mounting portion 23 formed as a through hole of the lower mold body 22 has portions of different sizes in the radial direction, forming a step 23a. When the oil supply device 50 is inserted into the mounting portion 23, the downward movement of the oil supply device 50 is restricted at the position where the step portion 51a contacts the step 23a. This prevents the oil supply device 50 from falling off the mounting portion 23, and allows it to function as a retainer.

Also, as shown in FIG. 1, the oil supply device 50 is disposed above the axial center position of the rotary cam 30. In other words, in the press device 10, the contact position between the ball 52 (contact portion) of the oil supply device 50 and the outer peripheral surface (sliding surface 30a) of the rotary cam 30 is located above the outer peripheral surface of the rotary cam 30. This allows the press device 10 to apply (supply) oil to the outer peripheral surface on the upper side of the rotary cam 30. Therefore, the oil flows down from the outer peripheral surface of the rotary cam 30 and reaches the outer peripheral surface on the lower side. As a result, the press device 10 can supply oil over a wide range of the rotary cam 30.

As shown in FIG. 6(a), when the rotary cam 30 rotates in the first direction X1 (the direction from the processing position P1 toward the retreat position P2), the ball 52 rotates in accordance with the displacement (rotation) of the sliding surface 30a of the rotary cam 30. In addition, when the ball 52 rotates, oil is guided from the oil reservoir 54 and applied to the outer circumferential surface (sliding surface 30a) of the rotary cam 30.

As shown in FIG. 6(b), when the rotary cam 30 rotates in the second direction X2 (the direction from the retracted position P2 toward the processing position P1), the ball 52 rotates in accordance with the displacement (rotation) of the sliding surface 30a of the rotary cam 30. When the ball 52 rotates, oil is guided from the oil reservoir 54 and applied to the sliding surface 30a of the rotary cam 30.

In this way, in the press device 10, the rotation of the rotary cam 30 rotates the ball 52, and oil is applied to the sliding surface 30a of the rotary cam 30. This allows the press device 10 to automatically supply oil by utilizing the rotation of the rotary cam 30. This allows the press device 10 to reduce the number of manual maintenance tasks and reduce labor costs.

In addition, in the press device 10, oil is supplied every time the rotary cam 30 operates (every time the rotary cam 30 rotates). This allows oil to be supplied even during production, reducing the occurrence of malfunctions.

Furthermore, because the contact part of the oil supply device rotates in accordance with the rotation of the rotary cam to supply oil, a constant amount of oil can be supplied. In other words, the amount of oil supplied is kept constant, and excess oil supply can be prevented.

As described above, the oil supply device 50 in the press device 10 is of a cartridge type, so the oil supply device 50 can be replaced just like replacing a cartridge.

Furthermore, the press device 10 does not require the provision of an oil groove for supplying oil to the rotary cam 30. This reduces the risk of malfunction due to the accumulation of dirt on the rotary cam 30, and providing an oil groove can prevent burrs from forming on the sliding surface 30a of the rotary cam 30.

The present invention can be suitably used to supply oil to the rotary cam of a rotary cam type press device.

10 Press device 20 Lower die 22 Lower die body 30 Rotary cam 50 Oil supply device 52 Ball (contact portion)
54 Oil reservoir

Claims (1)

A press apparatus comprising an upper die and a lower die, the lower die being provided with a lower die body and a rotary cam,
The lower die body is provided with an oil supply device,
The oil supply device includes:
A contact portion capable of coming into contact with the rotary cam;
an oil reservoir in which oil is sealed;
the oil supply device supplies oil from the oil reservoir to the rotary cam via the contact portion, and is configured to be replaceable by a cartridge type;
The oil sealed in the oil reservoir is pressed by a first biasing member via a blocking body,
The press apparatus , wherein the oil supply device is biased toward the rotary cam by a second biasing member .

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