JP7523056B2 - Knockout Device - Google Patents

Description

The present invention relates to a knockout device that is installed in a press machine having a die that moves toward or away from the press machine and that removes a workpiece from the die.

For example, to manufacture a cylindrical case (product) with a bottom from a sheet steel plate (workpiece), multiple press processes are carried out in succession to plastically deform the workpiece so that it gradually approaches the product shape. This makes it possible to manufacture a thin-walled case without causing wrinkles, distortions, or even cracks in the workpiece. A press machine capable of efficiently carrying out multiple press processes like this to shorten the manufacturing time is described in, for example, Patent Document 1.

The press machine described in Patent Document 1 is a so-called transfer press machine, and includes a support base having multiple lower forming tools (lower dies), and a slide that is movable up and down relative to the support base and has multiple upper forming tools (upper dies). The up and down moving slide is provided with a holding means that presses and holds a preformed body (workpiece) that has been punched into a disk shape. This holding means includes a coil spring and a rod member with a pressing member that is pressed toward the support base by the spring force of the coil spring.

Patent No. 2538772

However, in the technology described in Patent Document 1, the spring force of a coil spring attached to a slide that moves up and down is used to press and hold the preformed body placed on the support base, so the spring force of the coil spring changes significantly, especially when the slide moves up and down by a large amount.

As a result, the holding force of the holding means also changes significantly, and the position of the workpiece may shift when the support base vibrates significantly. If the position of the workpiece shifts, it may become impossible to transport the workpiece to the next process with high accuracy.

Furthermore, if you try to shorten the production time by increasing the vertical movement speed of the slide, in other words, to increase the number of products produced per unit time, the spring force of the coil spring changes significantly as described above, and the rod member pressed by the coil spring is unable to keep up with the vertical movement of the slide. As a result, the rod member rattles relative to the slide, causing what is known as "wild movement" of the rod member.

The object of the present invention is to provide a knockout device that can accurately position a workpiece in a specified position before transferring the workpiece to the next process, thereby shortening the manufacturing time.

In one aspect of the present invention, a knockout device is provided in a press machine having a die that moves toward or away from the die, and removes a processed product from the die, the knockout device comprising: a first cylinder provided in the die and extending in the direction of movement of the die; a hollow first piston provided inside the first cylinder so as to be able to slide freely; a hollow first rod having one end fixed to one axial side of the first piston and the other end protruding to the outside of the first cylinder; a first air chamber provided inside the first cylinder on the other axial side of the first piston and connected to a first air supply/exhaust mechanism; an ejection pin provided at the other end of the first rod and ejecting the processed product from the die; a second cylinder fixed to the other axial side of the first piston and extending in the direction of movement of the die; a solid second piston provided inside the second cylinder so as to be able to slide freely; a second air chamber provided on the other axial side of the second piston inside the second cylinder and connected to a second air supply/discharge mechanism; and a support pin provided at the other end of the second rod for supporting the processed product removed from the die , wherein a first bottom wall portion and a second bottom wall portion are provided on the other axial side of the first cylinder and the second cylinder, respectively, a first communication passage and a second communication passage communicating between the outside of the first cylinder and the first air chamber are provided in the first bottom wall portion, a third communication passage communicating between the first air chamber and the second air chamber is provided in the second bottom wall portion, and a flexible third air piping is provided between the second communication passage and the third communication passage inside the first air chamber.

In another aspect of the present invention , a first air pipe is provided between the first communication passage and the first air supply/exhaust mechanism outside the first cylinder, and a second air pipe is provided between the second communication passage and the second air supply/exhaust mechanism outside the first cylinder.

In another aspect of the present invention, the pushing force of the ejection pin against the workpiece is greater than the supporting force of the support pin against the workpiece.

According to the present invention, by supplying air to the first air chamber of the first cylinder, the ejection pin can be operated to remove the workpiece from the die, and by supplying air to the second air chamber of the second cylinder arranged inside the first cylinder, the support pin can be operated to support the workpiece removed from the die.

Therefore, regardless of the amount of movement of the support pin, the pressure of the support pin against the processed product can be properly maintained by adjusting the amount of air supplied to the second air chamber. This allows the workpiece to be accurately positioned in a specified position before being transferred to the next process, thereby shortening the manufacturing time.

FIG. 1 is a schematic diagram showing a transfer press machine. 1 is a cross-sectional view showing one (sixth press working unit PD6) of the first to twelfth press working units PD1 to PD12 provided in the transfer press machine of FIG. 1. FIG. 11 is a cross-sectional view illustrating the workpiece preparation process. FIG. 11 is a cross-sectional view illustrating the drawing process. 11 is a cross-sectional view showing a state in which the sixth press working part PD6 has reached the bottom dead center. FIG. FIG. 11 is a cross-sectional view illustrating the demolding process (knockout operation). FIG. 4 is a cross-sectional view illustrating the workpiece holding step. FIG. 11 is a cross-sectional view illustrating the workpiece transfer process. 1A is a cross-sectional view showing the upper and lower die units of the third press working unit PD3, and FIG. 1B is a cross-sectional view showing the upper and lower die units of the ninth press working unit PD9.

Below, one embodiment of the present invention will be described in detail with reference to the drawings.

Figure 1 is a schematic diagram showing a transfer press machine, Figure 2 is a cross-sectional view showing one (sixth press working unit PD6) of the first to twelfth press working units PD1 to PD12 provided in the transfer press machine of Figure 1, Figure 3 is a cross-sectional view explaining the [work preparation process], Figure 4 is a cross-sectional view explaining the [drawing process], Figure 5 is a cross-sectional view showing the sixth press working unit PD6 reaching the bottom dead center, Figure 6 is a cross-sectional view explaining the [mold release process (knockout operation)], Figure 7 is a cross-sectional view explaining the [work holding process], Figure 8 is a cross-sectional view explaining the [work transfer process], Figure 9(a) is a cross-sectional view showing the upper and lower die units of the third press working unit PD3, and (b) is a cross-sectional view showing the upper and lower die units of the ninth press working unit PD9.

The transfer press machine 10 shown in FIG. 1 is a press machine that efficiently performs multiple press processes to manufacture a bottomed cylindrical motor case (yoke). The transfer press machine 10 is heavy and is firmly fixed to a sturdy floor surface FL of a factory or the like. This allows the transfer press machine 10 to operate stably without rattling. The transfer press machine 10 has a base part 11 fixed to the floor surface FL and a housing 12 that covers the base part 11. Inside the housing 12, a total of 12 first press processing parts PD1 to 12th press processing parts PD12 (not shown in detail) are provided in a row in the longitudinal direction of the transfer press machine 10 (left and right direction in the figure).

As shown by the two-dot chain line in the figure, a slide (lifting member) 13 that is driven to move up and down inside the housing 12 is provided inside the housing 12. Specifically, the slide 13 moves up and down at a predetermined moving speed as indicated by the arrow M1 in the figure by a large electric motor (not shown) mounted on the transfer press machine 10. Here, a touch panel type operation unit 14 is installed near the transfer press machine 10. The operation unit 14 is provided with a controller that provides overall control of the transfer press machine 10, and by operating the operation unit 14, the moving speed of the slide 13 can be finely and steplessly adjusted.

The slide 13 is provided with upper dies (not shown) arranged in the longitudinal direction (left-right direction in the figure) to form the first to twelfth press processing sections PD1 to PD12, respectively. In contrast, the base section 11 is provided with lower dies (not shown) arranged in the longitudinal direction (left-right direction in the figure) to form the first to twelfth press processing sections PD1 to PD12, respectively. In other words, by operating the transfer press machine 10 and driving the slide 13 up and down, each upper die approaches or moves away from its corresponding lower die inside the housing 12.

In addition, inside the housing 12 and between the base 11 and the slide 13, a transfer mechanism 15 driven inside the housing 12 is provided as shown by the two-dot chain line in the figure. Specifically, the transfer mechanism 15 is moved at a predetermined speed as indicated by the arrow SW in the figure by a large electric motor (not shown) mounted on the transfer press machine 10. A synchronizing mechanism (not shown) is provided between the slide 13 and the transfer mechanism 15 so that their operations are synchronized with each other.

The transfer mechanism 15 transfers the processed products (workpieces or products) that have been pressed by the first to twelfth press processing sections PD1 to PD12 from the entrance side to the exit side of the housing 12 one after another inside the housing 12. Specifically, the transfer mechanism 15 has a pair of fingers (gripping claws) 15a (see Figures 7 and 8) for each press processing section. In other words, in this embodiment, since there are a total of 12 press processing sections, the transfer mechanism 15 has a total of 12 pairs of fingers 15a.

The transfer mechanism 15 is configured to simultaneously hold multiple workpieces and one product inside the housing 12 at a predetermined timing and transfer these workpieces and products to the next (downstream) process. As shown in FIG. 1, the workpiece (processed product) W0 before press processing is transferred into the inside of the transfer press machine 10 (housing 12) by the first conveyor device C1, and the completed product W12 after press processing in the twelfth press processing section PD12 is transferred outside the transfer press machine 10 (housing 12) by the second conveyor device C2. The flow direction of the workpieces and products is from left to right in FIG. 1.

In addition, an underfloor storage section SC is provided below the transfer press machine 10, and the underfloor storage section SC houses pneumatic equipment 20. The pneumatic equipment 20 is composed of an air compressor that generates compressed air, an air tank that stores the compressed air generated by the air compressor, a pressure sensor that detects the internal pressure of the air tank, a solenoid type supply and exhaust valve, a pressure regulating valve, etc. (not shown). The pneumatic equipment 20 also has the function of operating knockout devices provided in the upper dies of the first to twelfth press processing sections PD1 to PD12, respectively, and the lower dies of the first to twelfth press processing sections PD1 to PD12.

Here, the pneumatic equipment 20 is installed inside the underfloor storage section SC, which is located underground (below) the floor surface FL. This effectively prevents the operating noise of the pneumatic equipment 20 (especially the noise of an air compressor, which is a loud operating noise) from leaking outside the factory.

At the entrance side (left side in FIG. 1) of the transfer press machine 10, a punching machine 30 is installed, which punches out a disk material (blank) from a coil material CL made by rolling steel plate into a roll. The punching machine 30 is provided near and upstream of the transfer press machine 10, and is firmly fixed to the floor surface FL in the same manner as the transfer press machine 10. In addition, a first conveyor device C1 is provided between the punching machine 30 and the transfer press machine 10, which transfers the workpiece W0, which is a disk material, into the inside of the housing 12.

The punching machine 30 is equipped with a base 31 to which the coil material CL is supplied at a predetermined feed rate, and a punching punch 32 formed in a generally cylindrical shape that is freely movable up and down and is provided directly above the base 31 as shown by the arrow M2 in the figure. This punching machine 30 also operates in synchronization with the transfer press machine 10 by operating the operation unit 14. As a result, the workpieces W0 (blanks) punched by the punching punch 32 are supplied (transferred) one after another at a predetermined timing into the interior of the housing 12 via the first conveyor device C1.

Next, the detailed structure of the first to twelfth press working units PD1 to PD12 provided inside the housing 12 of the transfer press machine 10 will be described with reference to the drawings. The first to twelfth press working units PD1 to PD12 have different upper and lower mold shapes, but the rest of the structure is approximately the same. Therefore, the detailed structure of the sixth press working unit PD6, which is located approximately in the center of the housing 12 of one of the first to twelfth press working units PD1 to PD12, will be described as a representative example.

As shown in FIG. 2, in the sixth press working section PD6, the workpiece W5 that has been pressed by the fifth press working section PD5 located upstream is further pressed to form the workpiece W6, which is then handed over to the seventh press working section PD7 located downstream. In this way, the transfer press machine 10 according to this embodiment is configured to manufacture the product W12 (see FIG. 1) by performing a total of 12 press workings to plastically deform the blank workpiece W0 (see FIG. 1) so that it gradually approaches the product shape.

The sixth press processing section PD6 includes a sixth upper die unit 40 fixed to the slide 13 and a sixth lower die unit 50 fixed to the base portion 11. A knockout device 60 is fixed to the sixth upper die unit 40 via the slide 13. Specifically, the sixth upper die unit 40 is provided on the base portion 11 side of the slide 13 (lower side in the figure), and the knockout device 60 is provided on the opposite side of the slide 13 from the base portion 11 side (upper side in the figure). In addition, in Figures 2 to 9, the shapes of the base portion 11 and the slide 13 are simplified to make the structure of the sixth press processing section PD6 easier to understand.

The sixth upper mold unit 40 comprises, in order from the slide 13 side (upper side in the figure), a mold base 41 fixed to the slide 13, a cylindrical pin support member 42 fixed to the mold base 41, and a sixth upper mold (mold) 43 fixed to the pin support member 42.

The mold base 41 is formed in a generally cylindrical shape with a thick wall in the radial direction, and a through hole 41a that penetrates the sixth upper mold unit 40 in the axial direction is formed on the radially inner side. The through hole 41a of the mold base 41 slidably supports a cylindrical member 63b that forms part of the first rod 63 of the knockout device 60.

The pin support member 42 is arranged coaxially with the mold base 41, and a through hole 42a having a larger diameter than the through hole 41a of the mold base 41 is formed on the radially inner side. The through hole 42a of the pin support member 42 slidably supports the main body portion PP1 of one end of the ejection pin PP fixed to the other end of the cylindrical member 63b of the knockout device 60.

The sixth upper die 43 is arranged coaxially with both the die base 41 and the pin support member 42, and has a through hole 43a formed radially inward that is smaller in diameter than the through hole 42a of the pin support member 42. The through hole 43a of the sixth upper die 43 slidably supports the tip PP2 at the other end of the ejection pin PP. In addition, a machining recess (machining area) 43b is opened and provided on the base portion 11 side of the sixth upper die 43, and the machining recess 43b is configured to mold the radially outer side of the workpiece W6.

As shown in FIG. 2, the slide 13 also has a through hole 13a, and the through hole 13a of the slide 13 is also arranged coaxially with the other through holes 41a, 42a, 43a and the machined recess 43b. The through hole 13a of the slide 13 slidably supports the rod body 63a of the first rod 63. Here, the diameter of the tubular member 63b is smaller than the diameter of the rod body 63a. Therefore, the tubular member 63b is not in contact with the through hole 13a of the slide 13. This prevents the sliding resistance of the first piston 62 of the knockout device 60 from becoming unnecessarily large, improving the controllability of the knockout device 60.

Here, in addition to the sixth upper die unit 40, another upper die unit of a different shape (see FIG. 9) can be attached to the slide 13. This allows press processing to be performed in stages. The sixth upper die unit 40 is composed of a die base 41, a pin support member 42, a sixth upper die 43, a tubular member 63b, an ejection pin PP, a rod member 66b (described below), and a support pin SP. When replacing with another upper die unit (see FIG. 9), it is replaced with a corresponding lower die unit of a different shape (see FIG. 9).

The knockout device 60 is equipped with a large-diameter, long first cylinder 61. This first cylinder 61 is formed in a substantially cylindrical shape and extends in the direction of movement of the sixth upper die 43 (up and down in the figure). Specifically, the first cylinder 61 is fixed to the side of the slide 13 opposite the sixth upper die unit 40 (upper side in the figure). In other words, the first cylinder 61 is provided in the sixth upper die unit 40 (sixth upper die 43) via the slide 13.

A hollow first piston 62 is slidably provided inside the first cylinder 61. The first piston 62 divides the inside of the first cylinder 61 into a first upper chamber UR1 and a first lower chamber BR1. A seal ring 62a made of a material with good sliding properties such as fluororesin is attached to the radial outside of the first piston 62. This allows the first piston 62 to slide smoothly inside the first cylinder 61.

The first piston 62 is also formed with a communication hole 62b that connects both axial sides of the piston, and the communication hole 62b connects the first lower chamber BR1 of the first cylinder 61 with the second lower chamber BR2 of the second cylinder 64. In other words, the internal pressure of the first lower chamber BR1 and the internal pressure of the second lower chamber BR2 are the same pressure (same pressure).

One end of a hollow first rod 63 is fixed to one axial side (lower side in the figure) of the first piston 62. The first rod 63 is composed of a rod body 63a fixed to the first piston 62 and a tubular member 63b whose base end is fixed to the side of the rod body 63a opposite the first piston 62 side. The other end of the first rod 63 protrudes outside the first cylinder 61.

A hollow ejection pin PP formed in a roughly two-stage cylindrical shape is fixed to the other end of the first rod 63, i.e., the tip of the tubular member 63b. A large-diameter main body PP1 is provided at the base end side (upper side in the figure) of the ejection pin PP, and a tip portion PP2 having a smaller diameter than the main body PP1 is provided at the tip end side (lower side in the figure) of the ejection pin PP. A portion of the tip portion PP2 is exposed to the inside of the machining recess 43b of the sixth upper die 43, and has the function of pushing out the workpiece W6 stuck to the inside of the machining recess 43b from the machining recess 43b.

The first cylinder 61 is formed of a cylindrical main body 61a, a rod guide portion 61b that guides the sliding of the first rod 63 while closing one axial side of the cylindrical main body 61a, and a first bottom wall portion 61c that closes the other axial side of the cylindrical main body 61a. The cylindrical main body 61a, the first piston 62, and the first bottom wall portion 61c form a first upper chamber UR1, and the cylindrical main body 61a, the first piston 62, and the rod guide portion 61b form a first lower chamber BR1.

In addition, a communication hole 61d that connects the first lower chamber BR1 to the outside is provided in a portion of the cylindrical body 61a toward one axial side and near the rod guide portion 61b. No external equipment such as the pneumatic equipment 20 is connected to the communication hole 61d, meaning that the first lower chamber BR1 is open to the atmosphere. Therefore, the internal pressure of the first lower chamber BR1 is always atmospheric pressure. Accordingly, the internal pressure of the second lower chamber BR2 in the second cylinder 64 is also always atmospheric pressure.

Furthermore, the first bottom wall portion 61c is provided with a first communication passage 61e that connects the outside of the first cylinder 61 with the first upper chamber UR1. Then, outside the first cylinder 61, a first air piping TB1 is provided between the first communication passage 61e and the first air supply/exhaust mechanism 21 that constitutes the pneumatic equipment 20. In other words, the first upper chamber UR1 is connected to the first air supply/exhaust mechanism 21. Here, the first upper chamber UR1 is provided on the other axial side of the first piston 62 inside the first cylinder 61, and constitutes the first air chamber in the present invention.

As a result, by driving the first air supply/exhaust mechanism 21, air can be supplied to and exhausted from the first upper chamber UR1. Here, a flexible air pipe covered with, for example, metal fibers (mesh) and whose internal volume hardly changes is used for the first air pipe TB1. This improves the operational responsiveness of the first piston 62.

A second communication passage 61f that connects the outside of the first cylinder 61 with the first upper chamber UR1 is provided near the first communication passage 61e in the first bottom wall portion 61c. A second air pipe TB2 is provided outside the first cylinder 61 between the second communication passage 61f and the second air supply/exhaust mechanism 22 that constitutes the pneumatic equipment 20. A third air pipe TB3 is provided between the second communication passage 61f inside the first upper chamber UR1 and the third communication passage 64c of the second cylinder 64.

As a result, by driving the second air supply/exhaust mechanism 22, air can be supplied to and exhausted from the second upper chamber UR2 of the second cylinder 64 via the second air piping TB2 and the third air piping TB3. In other words, the second upper chamber UR2 is connected to the second air supply/exhaust mechanism 22. Here, the second and third air piping TB2, TB3 also use flexible air piping that has little change in internal volume and is covered with, for example, metal fibers (mesh). This also improves the operational responsiveness of the second piston 65 inside the second cylinder 64.

In this way, the first piston 62 and the second piston 65 that form the knockout device 60 both have good operating responsiveness, making it possible to operate the knockout device 60 quickly, thereby improving the operating speed (work efficiency) of the entire transfer press machine 10.

The third air pipe TB3 is arranged inside the first upper chamber UR1 with a sufficient length (slack so that it meanders). This allows the second cylinder 64 to move smoothly inside the first cylinder 61 in conjunction with the sliding of the first piston 62.

The knockout device 60 is equipped with a second cylinder 64 that is smaller in diameter and shorter than the first cylinder 61. The second cylinder 64 is formed in a generally cylindrical shape and extends in the direction of movement of the sixth upper die 43 (the up-down direction in the figure). Specifically, the second cylinder 64 is disposed inside the first upper chamber UR1 of the first cylinder 61 and is fixed to the other axial side of the first piston 62 (the upper side in the figure).

A solid second piston 65 is slidably provided inside the second cylinder 64. The second piston 65 divides the inside of the second cylinder 64 into a second upper chamber UR2 and a second lower chamber BR2. The diameter of the second piston 65 is smaller than the diameter of the first piston 62, and is set to approximately 1/3 of the diameter of the first piston 62. A seal ring 65a formed in an annular shape from a material with good sliding properties such as fluororesin is attached to the radial outside of the second piston 65. This allows the second piston 65 to slide smoothly inside the second cylinder 64.

One end of a solid second rod 66 is fixed to one axial side (lower side in the figure) of the second piston 65. The second rod 66 is composed of a rod body 66a fixed to the second piston 65 and a rod member 66b fixed to the side of the rod body 66a opposite the second piston 65. The rod body 66a and rod member 66b are slidably provided inside the hollow first piston 62 and hollow first rod 63, respectively.

Here, a tip sliding portion 66c having a larger diameter than the main body of the rod member 66b is provided on one axial side of the rod member 66b. The axial length of the tip sliding portion 66c is much shorter than the axial length of the main body of the rod member 66b. The tip sliding portion 66c is provided so as to be able to slide freely inside the tubular member 63b. This prevents the sliding resistance of the rod member 66b against the tubular member 63b from becoming unnecessarily large. This improves the operational responsiveness of the second piston 65, allowing the second piston 65 to move smoothly inside the second cylinder 64.

The base end (upper part in the figure) of a support pin SP, which is formed in a rod shape like the rod member 66b, is fixed to the tip sliding part 66c of the rod member 66b, i.e., the other end of the second rod 66. The tip side of the support pin SP is slidably provided inside the hollow ejection pin PP. Here, the tip part SP1 of the support pin SP can protrude from the ejection pin PP, and has the function of supporting the workpiece W6 removed from the machining recess 43b of the sixth upper die 43.

In addition, a base end sliding part SP2 is provided on the base end side of the support pin SP (upper side in the figure), which has the same diameter as the tip sliding part 66c and a shorter axial length. This prevents the sliding resistance of the support pin SP against the cylindrical member 63b from becoming unnecessarily large. This also improves the operational responsiveness of the second piston 65.

The second cylinder 64 is formed of a cylindrical main body 64a and a second bottom wall portion 64b that closes the other axial side of the cylindrical main body 64a, and one axial side of the second cylinder 64 is open. The first piston 62 is fixed to the opening of the second cylinder 64 so as to close the opening. The cylindrical main body 64a, the second piston 65, and the second bottom wall portion 64b form a second upper chamber UR2, and the cylindrical main body 64a, the second piston 65, and the first piston 62 form a second lower chamber BR2. Furthermore, the second bottom wall portion 64b is provided with a third communication passage 64c that communicates the second upper chamber UR2 of the second cylinder 64 with the first upper chamber UR1 of the first cylinder 61.

The second upper chamber UR2 is provided inside the second cylinder 64 on the other axial side of the second piston 65, and constitutes the second air chamber of the present invention. The knockout device 60 is also a common component to the other press working sections, namely the first to fifth press working sections PD1 to PD5 and the seventh to twelfth press working sections PD7 to PD12. Specifically, the knockout device 60 is composed of the first cylinder 61, the first piston 62, a rod body 63a, the second cylinder 64, the second piston 65, a rod body 66a, and the third air piping TB3.

The pneumatic equipment 20 connected to the knockout device 60 of the sixth press processing section PD6 includes a first air supply and exhaust mechanism 21 and a second air supply and exhaust mechanism 22. Both the first and second air supply and exhaust mechanisms 21, 22 are operated by the operation unit 14 (see FIG. 1). The first air supply and exhaust mechanism 21 supplies and exhausts air to the first upper chamber UR1 of the first cylinder 61, and the second air supply and exhaust mechanism 22 supplies and exhausts air to the second upper chamber UR2 of the second cylinder 64.

As shown in FIG. 2, the first air supply/exhaust mechanism 21 is provided for each of the first through twelfth press working sections PD1 through PD12 (12 in total). In contrast, the second air supply/exhaust mechanism 22 is common to each of the first through twelfth press working sections PD1 through PD12 (1 in total).

The first air supply/exhaust mechanism 21 controls the internal pressure of the first upper chamber UR1 to a positive or negative pressure, thereby causing the first piston 62 to slide vertically inside the first cylinder 61. At this time, the second cylinder 64 also moves vertically inside the first cylinder 61 together with the first piston 62, causing the third air piping TB3 to bend.

In addition, since the first to twelfth press processing sections PD1 to PD12 are linked by the lifting and lowering movement of one slide 13, the timing of the knockout operation to remove the processed product (workpiece W1 or product W12) is also simultaneous. Therefore, the first air supply and exhaust mechanisms 21 corresponding to the first to twelfth press processing sections PD1 to PD12 each operate in sync with the lifting and lowering movement of the slide 13.

The second air supply/exhaust mechanism 22 controls the internal pressure of the second upper chamber UR2 to a positive or negative pressure, thereby causing the second piston 65 to slide vertically inside the second cylinder 64.

The first to twelfth press processing sections PD1 to PD12 are linked by the lifting and lowering movement of a single slide 13, so the timing of the support operation for supporting the processed product (workpiece W1 or product W12) is also simultaneous. Therefore, the single second air supply and exhaust mechanism 22 corresponding to the first to twelfth press processing sections PD1 to PD12 also operates in sync with the lifting and lowering movement of the slide 13.

The first air supply/exhaust mechanism 21 has a higher output air compressor (not shown) than the second air supply/exhaust mechanism 22 because it is used for the knockout operation, which requires a relatively large pushing force (push-out force) to move the large-diameter first piston 62. The shapes of the processed products differ in the first to twelfth press processing sections PD1 to PD12, and therefore the pushing forces during the knockout operation also differ. For this reason, one first air supply/exhaust mechanism 21 is provided for each of the first to twelfth press processing sections PD1 to PD12. The pushing forces (push-out forces) during the knockout operation in the first to twelfth press processing sections PD1 to PD12 are all set to approximately 10 kN.

In contrast, the second air supply/exhaust mechanism 22 has a lower-output air compressor (not shown) than the first air supply/exhaust mechanism 21, since it is used for the workpiece support operation that requires a relatively small pressing force (supporting force) by moving the small-diameter second piston 65. The pressing force (supporting force) when supporting the workpiece in the first to twelfth press processing sections PD1 to PD12 is set to about 0.5 kN. As shown in Figures 5 to 7, the movement amount (t1-t2: about 240 mm) of the support pin SP that supports the processed product (workpiece W1 to product W12) is greater than the movement amount (T1-T2: about 120 mm) of the ejection pin PP (t1-t2>T1-T2), and the second air supply/exhaust mechanism 22 is equipped with a relatively large-capacity air tank and a pressure sensor for managing the internal pressure of the air tank at a predetermined pressure so as to be able to output a pressing force sufficient to support the processed product without deforming it.

In this way, by providing the first air supply and exhaust mechanism 21 and the second air supply and exhaust mechanism 22, which have different functions, the pushing force of the ejection pin PP against the workpiece is made greater than the supporting force of the support pin SP against the workpiece. In other words, the first air supply and exhaust mechanism 21 requires a large pushing force that is set individually for each of the first to twelfth press processing sections PD1 to PD12, whereas the second air supply and exhaust mechanism 22 requires more delicate management of the air pressure than the first air supply and exhaust mechanism 21. Therefore, in order to reduce the load on the operation unit 14 as much as possible, the second air supply and exhaust mechanism 22 is provided with an air tank and a pressure sensor, so that the supporting forces (which can all be the same pressing force) in the first to twelfth press processing sections PD1 to PD12 can be managed collectively.

As shown in FIG. 2, the sixth lower die unit 50 includes a sixth lower die (die) 51 formed in a generally cylindrical shape. The sixth lower die 51 is configured to mold the radially inner side of the workpiece W6. The sixth lower die 51 is also movable in the movement direction of the slide 13 (up and down in the figure) by an air supply and exhaust mechanism (not shown) for the lower die provided in the pneumatic device 20.

Specifically, as shown in Figures 5 and 6, the sixth lower die 51 can be raised and lowered freely relative to the base portion 11. This allows the workpiece W6 to be released from the sixth lower die 51. Note that the workpiece W6 released from the sixth lower die 51 remains in a specified position on the base portion 11 (directly above the lowered sixth lower die 51) (see Figures 6 and 7).

The base end (lower part in the figure) of the sixth lower mold 51 is fixed to a lifting platform 52 that is raised and lowered below the base part 11. The lifting platform 52 is raised and lowered by the supply and exhaust of air from an air supply and exhaust mechanism for the lower mold. The air supply and exhaust mechanism for the lower mold is also driven by the operation of the operation part 14 (see FIG. 1), and the timing of the descent of the lifting platform 52 (sixth lower mold 51), i.e., the timing of demolding, is approximately the same as the operation timing of the knockout device 60.

In this way, the sixth lower die unit 50 is formed from the sixth lower die 51 and the lifting platform 52 to which the sixth lower die 51 is fixed, and the sixth lower die 51 is set (paired) with the sixth upper die 43. In other words, the sixth lower die 51 and the sixth upper die 43 move toward or away from each other (cooperate) to mold the workpiece W6.

Next, the operation of the sixth press working section PD6 formed as described above will be explained in detail using the drawings.

[Work preparation process]
3, in the "workpiece preparation step," the transfer press machine 10 is in a "reference state." Specifically, the slide 13 is in a state in which it is disposed at a position farthest from the base portion 11, i.e., in a state in which it has reached the top dead center, and the separation distance L1 between the base portion 11 and the sixth upper die 43 is sufficiently larger than the installation height dimension Hw of the workpiece W5 (L1>Hw), so that the workpiece W5 can be easily set (installed) on the sixth lower die 51.

In addition, in the [workpiece preparation process], the ejection pin PP and support pin SP of the knockout device 60 are both positioned in their most retracted positions. Specifically, the separation distance between the first piston 62 and the rod guide portion 61b is the furthest separation distance T1, and the separation distance between the second piston 65 and the first piston 62 is the furthest separation distance t1. Here, the amount of movement of the second piston 65 is greater than the amount of movement of the first piston 62, so t1 > T1.

In the sixth press processing section PD6, the depth dimension HG6 of the processing recess 43b of the sixth upper die 43 that forms the workpiece W6 is equal to the height dimension of the workpiece W6. In addition, the inner diameter dimension WD6 of the processing recess 43b is equal to the outer diameter dimension of the workpiece W6.

Furthermore, the sixth lower die 51 of the sixth lower die unit 50 is in the uppermost position; specifically, when the top surface of the base 11 on which the workpiece (machined product) W5 is placed is taken as the reference position HB, the distance between the reference position HB and the lift table 52 is the closest distance S1. At this time, the sixth lower die 51 is locked by a locking mechanism (not shown), and the sixth lower die 51 will not descend even if a large pressing force (machining force) acts on the sixth lower die 51. Here, the outer diameter D6 of the sixth lower die 51 is equal to the inner diameter of the workpiece W6.

Then, as shown in FIG. 3, when the slide 13 is at its farthest position from the base portion 11, the transfer mechanism 15 (see FIG. 1) is driven as indicated by the dashed arrow in the figure, and the workpiece W5 that has been pressed in the fifth press processing portion PD5, which is located upstream of the sixth press processing portion PD6, is transferred to the sixth lower die 51 of the sixth press processing portion PD6. This causes the workpiece W5 to be set in the sixth lower die 51, completing the [workpiece preparation process].

In the [workpiece preparation process], the first and second air supply and exhaust mechanisms 21, 22 (see FIG. 2) are both driven to stop (prohibit) the intake and exhaust of air inside the first and second upper chambers UR1, UR2. As a result, the ejection pin PP and support pin SP are both held in their most retreated positions (the state shown in FIG. 3), and the ejection pin PP and support pin SP do not descend under their own weight.

[Drawing process]
4, in the drawing process, the slide 13 is lowered at a predetermined moving speed as indicated by an arrow M3 by driving the transfer press machine 10. As a result, the sixth upper die 43 approaches the sixth lower die 51, and the separation distance L1 (see FIG. 3) between the base portion 11 and the sixth upper die 43 gradually becomes shorter as a separation distance L2.

As a result, the tip side of the sixth lower die 51 penetrates into the machining recess 43b of the sixth upper die 43, and the workpiece W5 set in the sixth lower die 51 is squeezed (pressed) between the sixth lower die 51 and the sixth upper die 43, gradually approaching the shape of the workpiece W6.

During the drawing process of the workpiece W5, the sixth lower die 51 is positioned at the top and locked by the locking mechanism, as in the [workpiece preparation process]. In other words, the distance between the reference position HB and the lift table 52 is S1.

In addition, in the [drawing process], the knockout device 60 also has the ejector pin PP and the support pin SP both positioned in their most retracted positions, as in the [workpiece preparation process]. That is, the distance between the first piston 62 and the rod guide portion 61b is T1, and the distance between the second piston 65 and the first piston 62 is t1.

[Bottom dead center reached]
5, as the slide 13 continues to move downward, the sixth upper die 43 comes into contact with (butts against) the base portion 11. That is, the tip end of the sixth lower die 51 enters completely inside the sixth upper die 43, and the distance between the sixth upper die 43 and the base portion 11 becomes "0". In this way, the slide 13 reaches the bottom dead center by driving the transfer press machine 10, and the workpiece W5 enters completely between the sixth lower die 51 and the sixth upper die 43 to become the workpiece W6. This completes the drawing (pressing) process in the sixth press working section PD6.

At this time, the sixth lower die 51 is still positioned at the top and maintains a locked state. In addition, in the knockout device 60, the ejection pin PP and the support pin SP are both still positioned at their most retreated positions.

[Mold release process (knockout operation)]
Next, as shown in Fig. 6, the workpiece W6 processed by the sixth press processing section PD6 is removed from both the sixth upper die 43 and the sixth lower die 51 (knockout operation). Specifically, first, as shown by the outlined thick arrow in the figure, the first air supply/exhaust mechanism 21 (see Fig. 2) is driven to supply "positive pressure" air of a predetermined pressure (large) from the first communication passage 61e to the first upper chamber UR1 of the first cylinder 61. At approximately the same time, the second air supply/exhaust mechanism 22 (see Fig. 2) is driven to supply "positive pressure" air of a predetermined pressure (small) from the second communication passage 61f to the second upper chamber UR2 of the second cylinder 64. As a result, the internal pressure of the first and second upper chambers UR1 and UR2 is increased, as shown by the shading (light and dark) in Fig. 6.

The internal pressures of the first and second upper chambers UR1 and UR2 are controlled by the first and second air supply and exhaust mechanisms 21 and 22 so as to maintain them constant at predetermined internal pressures. The control of the internal pressures by the first and second air supply and exhaust mechanisms 21 and 22 (constant pressure maintenance control) continues in the next [workpiece holding process].

Then, as shown by the arrow M4 in the figure, the sixth lower die 51 is released from the locked state, and an air supply/exhaust mechanism (not shown) for the lower die provided in the pneumatic device 20 is driven to lower the sixth lower die 51. This causes the sixth lower die 51 to be released from the workpiece W6, and the tip portion of the sixth lower die 51 becomes hidden by the base portion 11. Specifically, the distance between the reference position HB and the lifting platform 52 becomes the maximum distance S2 (S2>S1).

Meanwhile, as shown by the arrow M5 in the figure, the slide 13 is now raised at a predetermined moving speed. Then, because the internal pressure of the first upper chamber UR1 of the first cylinder 61 is increased, as the slide 13 rises, the first cylinder 61 expands, that is, the first piston 62 approaches the rod guide portion 61b. At this time, the air inside the first lower chamber BR1 of the first cylinder 61 is released to the atmosphere through the communication hole 61d. As a result, almost the entire bottom surface of the workpiece W6 is pressed with a pressing force F1 (large) by the ejector pin PP, and the workpiece W6 is released from the sixth upper die 43.

When the slide 13 rises and the separation distance between the first piston 62 and the rod guide portion 61b becomes the closest separation distance T2 (T2<T1) and the separation distance between the base portion 11 and the sixth upper die 43 becomes L3 (L1>L3>L2), the workpiece W6 is completely released from the sixth upper die 43, and the release (knockout operation) of the workpiece W6 from the sixth upper die 43 is completed.

At this time, the support pin SP of the knockout device 60 has not yet protruded from the push-out pin PP, and so remains in its most retracted position. In other words, the distance between the second piston 65 and the first piston 62 remains at the maximum distance t1.

[Work holding process]
7, as the slide 13 continues to ascend, the sixth upper die 43 moves away from the base 11. The transfer press 10 then returns to the "reference state", where the slide 13 is positioned at the farthest position from the base 11, i.e., reaches the top dead center. In other words, the distance between the base 11 and the sixth upper die 43 becomes L1.

At this time, the internal pressure of the first upper chamber UR1 in the first cylinder 61 is maintained at "positive pressure." Therefore, the main body PP1 of the ejector pin PP is abutted against the sixth upper die 43, and the distance between them becomes "0." This stops the ejector pin PP from protruding further into the machining recess 43b, and the ejector pin PP leaves the workpiece W6.

The internal pressure of the second upper chamber UR2 in the second cylinder 64 is also maintained at a "positive pressure," so that the support pin SP now protrudes from the push-out pin PP. That is, in the [workpiece holding process], the tip SP1 of the support pin SP is maintained in a state in which it presses against a part of the bottom surface of the workpiece W6 with a pressing force F2 (F2<F1). Here, the magnitude of the pressing force F2, i.e., the supporting force supporting the workpiece W6, is set to a magnitude that does not deform the workpiece W6 and can hold the workpiece W6 without rattling or shifting from the specified position on the top surface (mounting surface) of the base portion 11.

When the transfer press machine 10 returns to the "reference state," the distance between the second piston 65 and the first piston 62 becomes closest to each other at distance t2, and the movement (protrusion) of the support pin SP becomes approximately maximum. At this time, the third air pipe TB3, which is provided with slack inside the first upper chamber UR1, becomes smoothly and approximately straight inside the first upper chamber UR1 (see FIG. 7). In addition, the air inside the second lower chamber BR2 of the second cylinder 64 is released to the atmosphere through the communication hole 62b, the first lower chamber BR1, and the communication hole 61d. Therefore, the second piston 65 can move smoothly inside the second cylinder 64.

In addition, as the second air supply/exhaust mechanism 22 is driven, the internal pressure of the second upper chamber UR2 of the second cylinder 64 is maintained at a predetermined (small) "positive pressure." Therefore, the support force (pressing force F2) of the support pin SP against the workpiece W6 is maintained approximately constant. Therefore, even in the "reference state" of the transfer press machine 10 shown in FIG. 7, the workpiece W6 is held in a specified position on the upper surface of the base portion 11 without rattling or shifting.

Then, the transfer mechanism 15 (see FIG. 1) is driven, and the workpiece W6 supported by the support pins SP is gripped by the pair of fingers 15a, as shown by the dashed arrow in FIG. 7. At this time, the workpiece W6 is accurately held in the correct position by the support pins SP, so the pair of fingers 15a can grip the workpiece W6 accurately and reliably without failing to grip the workpiece W6 or damaging it. This eliminates the need for unnecessary work such as stopping the operation of the transfer press machine 10 to check the gripping state of the workpiece W6. This completes the "workpiece holding process."

[Work transfer process]
Next, as shown in Fig. 8, the sixth upper mold unit 40 is returned (restored) to the "reference state" (see Fig. 3). Specifically, as shown by the thick black arrow in the figure, the first air supply/exhaust mechanism 21 (see Fig. 2) is driven to suck air from the first upper chamber UR1 of the first cylinder 61 through the first communication passage 61e and discharge it to the outside. That is, the first upper chamber UR1 becomes "negative pressure". At approximately the same time, the second air supply/exhaust mechanism 22 (see Fig. 2) is driven to suck air from the second upper chamber UR2 of the second cylinder 64 through the second communication passage 61f and discharge it to the outside. That is, the second upper chamber UR2 becomes "negative pressure".

As a result, as shown by the arrow M6 in the figure, both the ejector pin PP and the support pin SP rise, and both return to the state shown in FIG. 3. In other words, the distance between the first piston 62 and the rod guide portion 61b becomes the farthest distance T1, and the distance between the second piston 65 and the first piston 62 becomes the farthest distance t1. At this time, air (atmosphere) flows into the first lower chamber BR1 of the first cylinder 61 and the second lower chamber BR2 of the second cylinder 64 through the communication holes 61d and 62b, respectively.

Then, the workpiece W6 held by the pair of fingers 15a is transferred to the seventh press section PD7, which is downstream of the sixth press section PD6, by driving the transfer mechanism 15 (see FIG. 1). At this time, because the support pin SP has retracted and the separation distance L1 between the base section 11 and the sixth upper die 43 is sufficient, the workpiece W6 held by the transfer mechanism 15 or the pair of fingers 15a does not come into contact with the support pin SP or the sixth upper die 43.

Then, an air supply/exhaust mechanism (not shown) for the lower die provided in the pneumatic equipment 20 is driven, and as shown by the arrow M7 in the figure, the sixth lower die 51 rises, and the tip of the sixth lower die 51 emerges from the base portion 11. Thereafter, the locking mechanism (not shown) enters a locked state, and the separation distance S2 between the reference position HB and the lifting platform 52 becomes the closest separation distance S1 (see FIG. 3). In other words, the sixth lower die unit 50 also returns to the "reference state" shown in FIG. 3. This completes the [workpiece transfer process].

Here, in the transfer press machine 10 of this embodiment, the above-mentioned multiple processes (operations), namely, the [workpiece preparation process], [drawing process], [reaching bottom dead center], [mold release process (knockout operation)], [workpiece holding process], and [workpiece transfer process], are performed continuously in this order within an extremely short period of time. Specifically, the transfer press machine 10 of this embodiment employs a knockout device 60 having a so-called "double-cylinder air cylinder structure," and it has been found that it can stably achieve a production capacity of "30 to 60 pieces per minute."

In contrast, in a comparative example (not shown) in which the support pin SP was pressed by a coil spring as in the past, the expansion and contraction action of the coil spring could not keep up with the increasing speed of the raising and lowering action of the slide 13, and the production capacity was limited to "30 pieces per minute." In this way, the transfer press machine 10 of this embodiment can fully meet the need to shorten production time as well as the need to produce with high precision and eliminate defective products.

In addition, instead of the sixth upper mold unit 40 described above, for example, a third upper mold unit 70 and a ninth upper mold unit 90 as shown in Figures 9(a) and 9(b) can be attached to the slide 13. Correspondingly, a third lower mold unit 80 and a ninth lower mold unit 100 can be attached to the base part 11.

In the following description of the third upper mold unit 70, the third lower mold unit 80, the ninth upper mold unit 90 and the ninth lower mold unit 100, only the parts that differ from the sixth upper mold unit 40 and the sixth lower mold unit 50 will be described, and parts that have the same functions as the sixth upper mold unit 40 and the sixth lower mold unit 50 will be given the same symbols and detailed descriptions thereof will be omitted.

As shown in FIG. 9(a), the third upper die unit 70 includes a third upper die (die) 71. The third upper die 71 forms a large-diameter, shallower workpiece W3 (not shown) that is less narrowed than the workpiece W6, upstream of the sixth upper die unit 40. Therefore, the inner diameter dimension WD3 of the machining recess (machining area) 71b in the third upper die 71 is set to be larger than the inner diameter dimension WD6 of the machining recess 43b (see FIG. 3) (WD3>WD6).

The depth dimension HG3 of the machining recess 71b is set smaller than the depth dimension HG6 of the machining recess 43b (see FIG. 3) (HG3<HG6). Furthermore, due to the larger inner diameter dimension WD3 of the machining recess 71b, the diameter dimension of the tip portion PF3 of the ejector pin PN3 is set larger than that of the sixth upper die unit 40.

In addition, due to the increased inner diameter dimension WD3 of the machining recess 71b, the outer diameter dimension D3 of the third lower die 81 of the third lower die unit 80 is set to be larger than the outer diameter dimension D6 of the sixth lower die 51 (D3>D6).

As shown in FIG. 9(b), the ninth upper die unit 90 includes a ninth upper die (die) 91. The ninth upper die 91 forms a workpiece W9 (not shown) downstream of the sixth upper die unit 40, which is narrower and deeper than the workpiece W6. Therefore, the inner diameter dimension WD9 of the machining recess (machining area) 91b in the ninth upper die 91 is set smaller than the inner diameter dimension WD6 of the machining recess 43b (see FIG. 3) (WD9<WD6).

The depth dimension HG9 of the machining recess 91b is set to be larger than the depth dimension HG6 of the machining recess 43b (see FIG. 3) (HG9>HG6). Furthermore, due to the smaller inner diameter dimension WD9 of the machining recess 91b, the diameter dimension of the tip PF9 of the ejector pin PN9 is set to be smaller than that of the sixth upper die unit 40.

In addition, due to the smaller inner diameter dimension WD9 of the machining recess 91b, the outer diameter dimension D9 of the ninth lower die 101 of the ninth lower die unit 100 is set smaller than the outer diameter dimension D6 of the sixth lower die 51 (D9<D6).

As described above in detail, according to the knockout device 60 of this embodiment, by supplying air to the first upper chamber UR1 of the first cylinder 61, the ejection pin PP can be operated to remove the workpiece W6 from the sixth upper die 43, and by supplying air to the second upper chamber UR2 of the second cylinder 64 arranged inside the first cylinder 61, the support pin SP can be operated to support the workpiece W6 removed from the sixth upper die 43.

Therefore, regardless of the amount of movement (t1-t2) of the support pin SP, the pressing force F2 (support force) of the support pin SP against the workpiece W6 can be appropriately maintained by adjusting the amount of air supplied to the second upper chamber UR2. This allows the workpiece W6 to be accurately positioned in a specified position before being transferred to the next process, thereby shortening the manufacturing time.

In addition, according to the knockout device 60 of this embodiment, the flexible third air pipe TB3 is arranged inside the first upper chamber UR1 of the first cylinder 61 with a sufficient length (slack so as to meander), so that the second cylinder 64 can be moved smoothly inside the first cylinder 61 in conjunction with the sliding of the first piston 62. This improves the controllability of the second air supply/exhaust mechanism 22 (pneumatic equipment 20).

Furthermore, according to the knockout device 60 of this embodiment, the pressing force (push-out force) F1 of the ejection pin PP against the workpiece W6 is set to be greater than the pressing force (support force) F2 of the support pin SP against the workpiece W6 (F1>F2).

This allows the workpiece W6, which has been subjected to press processing (drawing), to be reliably removed (knocked out) from the processing recess 43b of the sixth upper die 43, and allows the workpiece W6 to be held without any wobbling or shifting relative to the specified position on the top surface (mounting surface) of the base portion 11 without deforming the workpiece W6.

The present invention is not limited to the above embodiment, and it goes without saying that various modifications are possible without departing from the spirit of the invention. For example, the above embodiment has been described using a transfer press machine 10 having multiple press processing sections PD1 to PD12 as an example, but the present invention is not limited to this, and can also be applied to a simple press machine that has a pair of upper and lower dies and produces a processed product in one go.

In addition, in the above embodiment, a transfer press machine 10 equipped with the first to twelfth press processing sections PD1 to PD12 (a total of 12 sections) was shown, but the present invention is not limited to this, and the number of press processing sections can be set arbitrarily depending on the material and size of the workpiece, as well as the processing depth (degree of drawing, etc.). In other words, the total number may be 11 or less, or 13 or more.

In addition, in the above embodiment, the product W12 is a cylindrical motor case (yoke) with a bottom, but the present invention is not limited to this, and can be used for any purpose as long as the shape can be pushed out by an ejection pin and supported by a support pin.

The material, shape, dimensions, number, installation location, etc. of each component in the above embodiment are arbitrary as long as they can achieve the present invention, and are not limited to the above embodiment.

10. Transfer press machine (press machine)
REFERENCE SIGNS LIST 11 Base portion 12 Housing 13 Slide 13a Through hole 14 Operation portion 15 Transfer mechanism 15a Finger 20 Pneumatic device 21 First air supply and exhaust mechanism 22 Second air supply and exhaust mechanism 30 Punching machine 31 Base 32 Punching punch 40 Sixth upper die unit 41 Die base 41a Through hole 42 Pin support member 42a Through hole 43 Sixth upper die (die)
43a: through hole 43b: machining recess 50: sixth lower die unit 51: sixth lower die (die)
Description of the Related Art 52 Lifting platform 60 Knockout device 61 First cylinder 61a Cylindrical main body 61b Rod guide portion 61c First bottom wall portion 61d Communication hole 61e First communication passage 61f Second communication passage 62 First piston 62a Seal ring 62b Communication hole 63 First rod 63a Rod main body 63b Cylindrical member 64 Second cylinder 64a Cylindrical main body 64b Second bottom wall portion 64c Third communication passage 65 Second piston 65a Seal ring 66 Second rod 66a Rod main body 66b Rod member 66c Tip sliding portion 70 Third upper die unit 71 Third upper die 71b Machined recess 80 Third lower die unit 81 Third lower die 90 Ninth upper die unit 91 Ninth upper die 91b Machined recess 100 Ninth lower die unit 101 Ninth lower die BR1 First lower chamber BR2 Second lower chamber C1 First conveyor device C2 Second conveyor device CL Coil material F1 Pressing force (push-out force)
F2 Pressure force (supporting force)
FL Floor surface HB Reference position PD1 to PD12 1st to 12th press processing sections PD6 6th press processing section PF3 Tip section PF9 Tip section PN3 Ejector pin PN9 Ejector pin PP Ejector pin PP1 Main body section PP2 Tip section SC Underfloor storage section SP Support pin SP1 Tip section SP2 Base end sliding section TB1 1st air pipe TB2 2nd air pipe TB3 3rd air pipe UR1 1st upper chamber (1st air chamber)
UR2 Second upper chamber (second air chamber)
W0, W5, W6 Work (processed product)
W12 Products (processed products)

Claims (3)

A knockout device provided in a press machine having a die that approaches or moves away from the die, for removing a processed product from the die, comprising:
A first cylinder provided in the mold and extending in a moving direction of the mold;
a hollow first piston slidably provided inside the first cylinder;
a hollow first rod having one end fixed to one axial side of the first piston and the other end protruding outside the first cylinder;
a first air chamber provided on the other axial side of the first piston inside the first cylinder and connected to a first air supply/exhaust mechanism;
an ejection pin provided at the other end of the first rod for ejecting the processed product from the die;
a second cylinder fixed to the other axial side of the first piston and extending in the moving direction of the die;
a solid second piston slidably provided inside the second cylinder;
a second rod having one end fixed to one axial side of the second piston and slidably provided inside the first piston and the first rod;
a second air chamber provided on the other axial side of the second piston inside the second cylinder and connected to a second air supply/exhaust mechanism;
a support pin provided at the other end of the second rod for supporting the processed product removed from the die;
Equipped with
A first bottom wall portion and a second bottom wall portion are provided on the other axial side of the first cylinder and the second cylinder, respectively;
a first communication passage and a second communication passage communicating between an outside of the first cylinder and the first air chamber are provided in the first bottom wall portion,
a third communication passage that communicates the first air chamber and the second air chamber is provided in the second bottom wall portion,
a third air pipe having flexibility is provided between the second communication passage and the third communication passage inside the first air chamber ,
Knockout device. 2. The knockout device according to claim 1 ,
a first air pipe is provided between the first communication passage outside the first cylinder and the first air supply/exhaust mechanism;
A second air pipe is provided between the second communication passage outside the first cylinder and the second air supply/exhaust mechanism.
Knockout device. a pushing force of the ejection pin against the workpiece is greater than a supporting force of the support pin against the workpiece,
The knockout device according to claim 1 or 2.

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