Puncher head

Abstract

To provide a hydrostatic pressure puncher head capable of punching a work-piece such as a rail fitted to a building.SOLUTION: A puncher head includes: a punch 4 fitted to an end of a ram 3 of a hydrostatic pressure cylinder 2; and a die 5 fitted to an output side end part of the cylinder 2 so as to be engageable with the punch 4 via a die holder 7. In what arranges a work-piece between the punch 4 and the die 5 and punches the work-piece with a shear force of the advancing punch 4 and the die 5, the die holder 7 is provided with first, second brackets connected to the cylinder 2 with an axis line of the cylinder 2 in between so that they are mutually openable / closable; and a holder part for holding the die. The holder part is one with the first bracket, and is connectable to the second bracket or connectable to both brackets.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a puncher head that uses hydraulic or other fluid pressure as a drive source, and is particularly suitable for use in punching holes in hanger rails, raceways, etc. [Background technology]

[0002] A hanger rail or raceway (hereinafter, simply referred to as "rail") is attached to a building such as a ceiling or lintel with bolts or screws to hang doors, curtains, etc. in a movable manner, or to attach lighting fixtures in a manner that allows them to be powered. Therefore, it is usually cut to a standardized length before installation, and is transported to the site with holes for the bolts or screws drilled through it. Cutting is usually performed by a cutter that has a receiving blade with a slot formed therein for the rail to pass through, and a cutting blade that is also formed with a slot and is in a surface pair with the receiving blade, allowing it to move. Cutting and drilling are sometimes performed on an assembly line with the cutter and the hole drilling tool located close to each other. There are drills and hydraulic punchers as tools for drilling holes, each of which has its own advantages and disadvantages, with hydraulic punchers having the advantages of not producing fine chips and being quieter. This is because hydraulic punchers insert a rail between a male punch and a female die, and drill holes in one go by the shear force that accompanies the engagement of the punch and the die. A hydraulic tool capable of cutting and drilling independently has also been proposed (Patent Document 1).

[0003] However, after a rail is attached to a building, it may become necessary to drill holes in another location on the rail because the mounting strength is insufficient or the bolts or screws have come loose after years of use. Even in this case, in order to drill holes in the rail using a conventional hydraulic puncher, as mentioned above, the rail must be removed from the building once because the rail needs to be inserted between the punch and die.

[0004] In addition, whether it is a hanger rail or a raceway, it usually has a U-shape in cross section consisting of a center plate and both side walls, but depending on the cutter, the slot may have a downward U-shape or an upward U-shape. Therefore, when cutting and drilling are performed on an assembly line as described above, if there is no need to change the position of the rail when cutting and drilling, work efficiency increases accordingly. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 8-318423 Summary of the Invention [Problem to be solved by the invention]

[0006] However, removing rails just to drill additional holes in rails that are already attached to a building is extremely inefficient, and having multiple hydraulic punchers to align the cutter and rail in the previous process places an economic burden on workers. Therefore, a first object of the present invention is to provide a head for a fluid pressure puncher that makes it possible to punch holes in a workpiece such as a rail that is attached to a building, and a second object of the present invention is to provide a head for a fluid pressure puncher that can be easily and inexpensively combined with a plurality of cutters that cut the workpiece in different positions. [Means for solving the problem]

[0007] In order to solve the problem, the puncher head of the present invention is The machine is equipped with a punch attached to the tip of the ram of a fluid pressure cylinder, and a die attached to the output end of the cylinder so that it can fit with the punch via a die holder. A workpiece is placed between the punch and the die, and a hole is made in the workpiece by the shear force of the punch and die which move forward together with the ram as the cylinder is pressurized, and the punch is retracted by a return spring as the cylinder is released. The die holder is characterized in that it comprises first and second brackets connected to the cylinder so as to be able to open and close with respect to the axis of the cylinder, and a holder portion that holds the die, and the holder portion is integral with the first bracket and connectable to the second bracket, or is connectable to both brackets.

[0008] When using this puncher head for a workpiece such as a rail attached to a building, the workpiece is placed between them, the first bracket and the second bracket are closed together, and the holder part is connected to the second bracket. If the holder part is separate from the first bracket, it is also connected to the first bracket. This fixes the die to the die holder and supports the workpiece on the die. Then, by increasing the pressure of the fluid pressure cylinder, the punch advances toward the die accompanied by the ram, and a hole is made in the workpiece by the shear force with the die. Next, by releasing the fluid pressure cylinder, the punch retreats together with the ram due to the restoring force of the return spring. Finally, the connection between the holder part and the second bracket is released. This opens the first and second brackets, and the puncher head can be separated from the workpiece.

[0009] In this manner, by using the puncher head of the present invention, holes can be drilled in the workpiece while it is still attached to the building. The first and second brackets may be opened and closed with a simple structure so long as they are rotatable about their own ends on the cylinder side, thereby enabling them to be opened and closed.

[0010] It is preferable that the holder part is integral with the first bracket and connectable only to the second bracket, rather than being connectable to both the first and second brackets, because this saves the effort of connecting to the first bracket and there is no risk of losing the holder part.

[0011] Even in the case of a workpiece that is standardized to some extent, for example a hanger rail or raceway, the width of the mid-plate and the height of both side walls vary, and there are cases where the mid-plate is supported on its inner side by a die and punched from its outer side by a punch, and cases where punching is performed in the opposite direction. Therefore, the puncher head preferably further includes a pair of jigs that hold the workpiece against the die or support the workpiece together with the die, which are detachably mounted in a nested manner on the inner sides of the first and second brackets facing each other. This allows a single puncher head to punch holes in workpieces of various sizes and orientations. Since the jigs are detachable in a nested manner, they are easy to replace.

[0012] Another preferred configuration of the puncher head is such that the cylinder and the first and second brackets are connected via a connector having a through hole in the axial direction of the cylinder, The ram has a piston that can reciprocate within the cylinder, and a push rod that advances within the through hole of the connector, taking the punch with it as the piston advances; The return spring is disposed in the gap between the through hole of the connector and the push rod. With this configuration, the ram is separated by the piston and the push rod, so that the cylinder can be shared with other tool heads. Effect of the Invention

[0013] As described above, the puncher head of the present invention can punch holes in the workpiece while it is still attached to the building, improving work efficiency. In addition, it can be used for workpieces of various sizes and orientations, reducing the economic burden on the worker. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is an axial cross-sectional view showing the puncher head of the embodiment. [Diagram 2] FIG. 4 is a front view showing a mounting base on which the puncher head is mounted. [Diagram 3] FIG. 4 is a right side view showing the puncher head together with the mounting base. [Figure 4] FIG. [Diagram 5] FIG. 4 is an axial cross-sectional view showing a puncher head of another embodiment. [Figure 6] 13A and 13B are front views showing the main part of a puncher head of still another embodiment, with FIG. 13A showing the bracket in an open state and FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] -Embodiment 1- 1 to 3, the puncher head 1 of the embodiment comprises a hydraulic cylinder 2, a ram 3, a punch 4 attached to the tip of the ram 3, a die 5 engageable with the punch 4, and a return spring 6, and punches a hole in a hanger rail W, which is a workpiece, by the shear force of the punch 4 and die 5 which move forward together with the ram 3 as the pressure of the cylinder 2 rises, and the punch 4 is retracted by the restoring force of the return spring 6 as the cylinder 2 is released. The puncher head 1 is fixed to a stationary base 9 so that its position can be changed as necessary.

[0016] Cylinder 2 has plate-shaped connecting portions at linearly symmetric positions at its output end, with the axis of cylinder 2 (hereinafter simply referred to as "axis") as the axis of symmetry, and each connecting portion is provided with a pin hole that penetrates in the thickness direction. The ram 3 is composed of a piston 31 and a push rod 32. The piston 31 moves forward (descending in the drawing) with an increase in pressure of oil sent from a hydraulic pump (not shown) to an oil passage 21 in the cylinder 2. The rear end face of the push rod 32 is in elastic contact with the front end face of the piston 31 due to the restoring force of a return spring 6, and the front end face holds the punch 4.

[0017] The die 5 has a flange 51 on its outer circumferential surface and is generally cylindrical, and is detachably fixed to a die holder 7. The die holder 7 includes first and second brackets 71, 72, and a holder portion 73 formed integrally with the first bracket 71 to hold the die 5.

[0018] The brackets 71 and 72 are symmetrical with respect to each other, except for the presence or absence of the holder portion 73 and the presence or absence of a connecting portion with the mounting base 9. Each is connected to the output side end of the cylinder 2 via a single connecting tool 8, which will be described in detail later, and by rotating around the connecting point, the ends farther from the cylinder 2 can move away from or toward each other with the axis of the cylinder 2 between them. The brackets 71 and 72 each have a connecting portion at the cylinder 2 side end, which has the same thickness as the connecting portion of the cylinder 2, and the connecting portion has a pin hole. The bracket 71 further has connecting portions extending in a direction away from the axis, i.e., outward, at four locations in total, up and down in the axial direction and at the front and back when viewed from the front. The front connecting portion and the back connecting portion face each other, and pin holes are provided in all connecting portions. The bracket 72 further has connecting portions at the front and back of the end farther from the cylinder 2, which face each other, and both have pin holes.

[0019] The holder part 73 extends toward the bracket 72 from the end of the bracket 71 farther from the cylinder 2, has a thin-walled tip, and has a pin hole in the thin-walled part. The bracket 72 and the holder part 73 are connected by inserting the thin-walled part into the opposing connecting part of the bracket 72 and inserting the movable pin into the pin hole. The holder part 73 further has a through hole that is coaxial with the axis and has the same inner diameter as the outer diameter of the die 5, and the die 5 is fitted into the through hole from the punch 4 side, and the flange 51 engages with the edge of the through hole so that the die 5 resists the punch 4.

[0020] The connector 8 has an H-shape in plan view, integrally having four blades, and has a hole in the center of the H shape that passes through in the axial direction and passes the push rod 32. The blades are symmetrical in front view, with the two on the left facing each other at the front and back, and the two on the right facing each other in the same way, and each has two pin holes at the top and bottom. The connector 8 and the cylinder 2 are connected by inserting the connecting part of the cylinder 2 between the opposing blades of the connector 8 and inserting the movable pins into the respective pin holes. The connector 8 and the bracket 71 are connected to the connector 8 so that the bracket 71 can swing around the movable pin to the connecting part 8 by inserting the connecting part of the bracket 71 between the opposing blades of the connector 8 and inserting the movable pins into the respective pin holes. The bracket 72 is also connected to the connector 8 so that it can swing.

[0021] Box-shaped recesses are formed on the inside of brackets 71, 72, and jigs 74, 74 which are T-shaped when viewed from the front are nested in each recess so that they are laid sideways facing each other and fixed in place by ball lock pins 75, 75.

[0022] When the puncher head 1 is used, the connection between the bracket 72 and the holder portion 73 is released, and the brackets 71 and 72 are opened as shown by the imaginary lines in Fig. 1. Then, the brackets 71 and 72 are closed so that the hanger rail W is positioned between them, the outer surface of the middle plate of the hanger rail W is supported by the jigs 74 and the inner surface is supported by the die 5, and the thin-walled portion of the holder portion 73 is inserted into the connecting portion of the bracket 72, and the movable pin is inserted into the pin hole. In this way, the cylinder 2, the connecting member 8, the brackets 71 and 72, the holder portion 73, the die 5, and the jigs 74 are fixed to each other, and the axial movement of the hanger rail W relative to the punch 4 is prevented. Therefore, the punch 4 advances toward the die 5 as the pressure of the cylinder 2 increases, and a hole is punched in the hanger rail W.

[0023] With the puncher head 1, there is no need to insert the hanger rail W between the punch 4 and the die 5, and simply by closing the brackets 71, 72 at the intended longitudinal position of the hanger rail W where a hole is to be drilled, the hanger rail W can be positioned between the punch 4 and the die 5. Therefore, the hole drilling work is easy even for an extremely long hanger rail W, and holes can be drilled even in a hanger rail W that is attached to a building.

[0024] -Embodiment 2- 2 and 3, the base 9 includes support legs 91, a platform 92, a stand 93 fixed to an upper surface of one side of the platform 92, a shaft 94, and a handle 95.

[0025] The support legs 91, 91 are each L-shaped in vertical cross section and U-shaped in plan view, and are arranged on both sides in outward line symmetry when viewed from the front. The support leg 91 has long vertical slits formed at the front and back positions when viewed from the front. The platform 92 is flat and has screw holes formed on both end faces, and a bolt is inserted through the slit and fitted into the screw hole, thereby fixing the platform to the support legs 91, 91 so as to be movable up and down between the support legs 91, 91.

[0026] The stand 93 has an axial hole penetrating from the front to the back in a front view. The shaft 94 is composed of an axial portion 94a that fits in the axial hole in a rotating pair relationship, a male screw portion 94b that extends further back than the axial portion 94a, i.e., toward the handle 95, and a connecting portion 94c that is in the form of a plate that is long in the vertical direction and in front of the axial portion 94a. Pin holes are provided at the top and bottom of the connecting portion 94c, which correspond to the pin holes of the four connecting portions facing outward of the bracket 71. The puncher head 1 is fixed to the mounting base 9 by inserting the upper and lower parts of the connecting portion 94c into the upper and lower connecting portions facing outward of the bracket 71, respectively, and inserting the movable pin into the pin hole. The handle 95 has a female screw that is in a screw pair relationship with the male screw portion 94b, and by turning the handle 95 in a direction that tightens the screw via a washer 96, the washer 96 is pressed against the stand 93, preventing the shaft 94 from rotating.

[0027] With this mounting base 9, the rotation of the shaft 94 is allowed or prevented by turning the handle 95 to loosen or tighten the screw, so that the puncher head 1 can be fixed in a desired position as shown in Fig. 4. Therefore, when drilling holes following cutting of the rail, the puncher head can be mounted so as to correspond to the position of the rail on the rail cutter, and there is no need to change the position of the rail from cutting to drilling.

[0028] -Embodiment 3- In the puncher head of embodiment 1, the first bracket 71 and the holder portion 73 are integrated. In contrast, the puncher head of this embodiment differs from embodiment 1 in that the first bracket 76 and the holder portion 77 are separate bodies as shown in Fig. 5. Therefore, the holder portion 77 can be connected to and released from both the brackets 76, 72.

[0029] -Embodiment 4- In the puncher head of the first embodiment, the jigs 74, 74 are T-shaped when viewed from the front. In contrast, the puncher head of this embodiment differs from the first embodiment in that one jig 78 is L-shaped when viewed from the front, and the other jig 78 is an inverted L-shape facing it, as shown as a main part in Fig. 6. Therefore, in this embodiment, both the jigs 78, 78 and the die 5 support the outer surface of the middle plate of the hanger rail W, and the attitude of the hanger rail W can be turned upside down from that in the first embodiment so as to counter the force applied from the punch 4. [Explanation of symbols]

[0030] 1 Puncher Head 2 Hydraulic cylinder 3. Ram 4 Punch 5 Die 6 Return spring 7 Die holder 8 Connectors 9 Stand

Claims

1. A pressurizing machine comprising: a punch attached to the tip of a ram of a fluid pressure cylinder; and a die attached to the output side end of the cylinder via a die holder so as to be engageable with the punch; a workpiece is placed between the punch and the die; a hole is made in the workpiece by a shear force of the punch and the die which advance together with the ram as the pressure of the cylinder rises; and the punch is retracted by a return spring as the cylinder is released, The die holder includes first and second brackets connected to the cylinder so as to be openable and closable with respect to the axis of the cylinder, and a holder portion for holding the die, the holder portion being integral with the first bracket and connectable to the second bracket, or connectable to both brackets. A puncher head characterized by:

2. 2. The puncher head according to claim 1, wherein the first and second brackets are rotatable about their own ends on the cylinder side, thereby enabling them to be opened and closed.

3. The puncher head according to claim 1 , wherein the holder portion is integral with the first bracket and connectable to a second bracket.

4. The puncher head of claim 1, further comprising a pair of jigs which are telescopically attachable and detachable to the opposing inner surfaces of the first and second brackets, respectively, for holding the workpiece against the die or supporting the workpiece together with the die.

5. The cylinder and the first and second brackets are connected via a connector having a through hole in the axial direction of the cylinder, The ram has a piston that can reciprocate within the cylinder, and a push rod that advances within the through hole of the connector, taking the punch with it as the piston advances; The puncher head according to claim 1 , wherein the return spring is disposed in a gap between the through hole of the connector and the push rod.

6. The puncher head of claim 1 , wherein the workpiece is a hanger rail or a raceway.

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