JPH073821U - Press brake - Google Patents

Abstract

(57) [Abstract] [Purpose] To facilitate the work of fixing the upper mold by the holder and prevent the holder from tilting due to a load. [Structure] A holder insertion groove 32 having an open lower surface and a front surface is formed at a lower end portion of a ram 4. The holder 7 has a ram connecting portion 30 that can be inserted into and removed from the holder inserting groove 32 at the upper end, and an engaging groove 36 is formed in the front surface of the ram connecting portion 30. The holder 7 is fixed to the ram 4 by the fixing plate 40.
The fixing plate 40 has an engaging projection 4 which can be engaged with and disengaged from the engaging groove 36.
1 is provided. Between the engaging projection 41 of the fixed plate 40 and the engaging groove 36, the holder 7 is pushed up by the tightening force of the bolts 50 and 51, and the upper end surface of the ram connecting portion 30 is moved to the groove bottom portion of the holder inserting groove 32. Biased taper surfaces 33 and 43 are formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a press brake for bending a plate material to be processed, and more particularly, the present invention relates to improvement of a holder mounting structure for holding an upper die.

[0002]

[Prior art]

 In general, a press brake has a structure in which a lower die is fixed on a table, and the upper die is attached to the lower end edge of the ram through a plurality of holders. By pressing the plate material to be processed with the mold, the plate material is processed into a predetermined bending shape.

Each holder is provided with a pair of front and rear mounting plates, a through hole is provided in the front mounting plate and the lower edge of the ram, and a screw hole is provided in the rear mounting plate. When mounting each holder to the ram, with the through hole and the screw hole aligned, sandwich the bottom edge of the ram in the center and make the mounting plates face each other in the front and rear direction, and attach the bolts to the mounting plate on the front side and the ram. The three parts are fixed together by inserting them into the through hole and screwing the screw part of the bolt into the screw hole of the rear mounting plate (Japanese Patent Publication No. 60-17610).

When bending a plate material having a length shorter than the width of the machine body by using the press brake of this kind of structure, an upper die having a length corresponding to the length of the plate material to be processed is prepared, and Hold the mold in the central position with the required number of holders, and work with the unnecessary holders left on the bottom edge of the ram.

However, when the plate material to be processed is a plate material 62 having standing side plates 60 and 61 as shown in FIG. 4, and it is desired to perform bending along the dotted line in the figure, each side plate 60 , 61 hits the holder, making bending difficult.

As shown in FIG. 5, when the length L1 of the upper die 71 does not match the total length L2 of the holders 72 holding the upper die 71, the mounting position of each holder 72 on the ram 73 is Since it is fixed, the end portion of the upper die 71 may protrude from the holder 72 by a considerable length. In this case, sufficient pressure is not applied to the plate member 62 to be processed on the protruding portions 71a and 71b, and proper bending becomes difficult.

[0007] Therefore, the applicant of the present invention has recently worked on a plate material to be processed even if the side plate exists, even if the length of the upper die does not match the total length of the holders holding the upper die. We proposed a holder mounting structure as shown in Fig. 6 and Fig. 7 that allows proper bending (Actual No. 5-13611).

In the figure, reference numeral 84 denotes a projecting portion formed at the lower end of the ram 83, and a pair of mounting plates 81 and 82 constituting the holder 80 are opposed to each other with the projecting portion 84 of the ram 83 being sandwiched in the center. It is arranged. Engagement protrusions 85, 86 and slide grooves 87, 88 are formed on the front and rear surfaces of the protrusion 84 over the entire length of the ram 83, while the engaging protrusions 85, 86 are formed on the upper ends of the mounting plates 81, 82. Engagement pieces 89 and 90 are formed to be engaged with and supported by the abutting portions 85 and 86. When the engagement state between the engagement pieces 89, 90 and the engagement projections 85, 86 is maintained and the tightening force of the bolt 91 is loosened, the holder 80 is moved along the longitudinal direction of the ram 83. At this time, the engaging pieces 89 and 90 slide the slide grooves 87 and 88.

In the figure, reference numeral 92 denotes an eccentric member formed by eccentricizing an intermediate shaft portion 95 coaxially with the front and rear shaft portions 93, 94. By inserting a tool into the hexagonal hole 96 provided in the end face and rotating the tool, the intermediate shaft portion 95 is eccentrically rotated, and the central adjustment plate 99 and the front and rear mounting plates 81, 82 are vertically moved. Adjust the relative positional relationship of. This makes it possible to deal with the phenomenon that the center of the upper die recedes from both ends when the plate material to be processed is pressed.

When fixing the upper die to the ram 83 via each holder 80, the ram 83 is moved downward and pressed while the tightening force of the bolts 91, 97, 98 of each holder 80 is relaxed. As a result, the upper end surface of the adjusting plate 99 is pressed against the reference surface A of the ram 83, and the bolts 91, 97, 98 are tightened in this pressed state. At this time, the engagement pieces 89, 90 are located in the slide grooves 87, 88, and a gap L is created between the engagement pieces 89, 90 and the engagement protrusions 85, 86.

[0011]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, when mounting and fixing the upper die, it is necessary to purposely lower the ram 83 to bring it into a pressurized state and tighten the bolts 84, 85, 86 in that state, so that the upper die ram by the holder 80 is required. It takes time to fix it to 83.

Further, since the holder 80 is fixed to the ram 83 by the tightening force of the bolt 91, when the one-sided load P acts, the holder 80 moves to the gap L as shown by the chain double-dashed line in FIG. There is also the problem of displacement and tilting within the range.

The present invention has been made in view of the above problems, and an object thereof is to provide a press brake that facilitates the upper die fixing operation by the holder and prevents the holder from tilting due to one load. .

[0014]

[Means for Solving the Problems]

 The press brake of this invention has a structure in which the upper die is attached to the lower end of the ram through a plurality of holders and a plurality of fixing members for individually fixing the holders to the ram. At the lower end of the ram, a holder insertion groove having an open lower surface and a front surface is formed. Each of the above-mentioned holders has a ram connecting portion that can be inserted into and removed from the holder inserting groove at the upper end portion, and an engaging groove is formed on the front surface of this ram connecting portion. Each of the above-mentioned fixing members is composed of a fixing plate having an engaging protrusion that can be engaged with and disengaged from the engaging groove, and a tightening member for tightening and fixing the fixing plate to the front surface of the ram. Between the engaging protrusion and the engaging groove of each holder, a taper that pushes up the holder by the tightening force of the tightening member and urges the upper end surface of the ram connecting part toward the groove bottom of the holder inserting groove. The surface is formed.

[0015]

[Action]

 Insert the ram connecting part of the holder into the holder inserting groove at the bottom of the ram, insert the engaging protrusion of the fixing plate into the engaging groove of the ram connecting part, and tighten the tightening member. By the action, the holder is pushed up, and the upper end surface of the ram connection portion is pressed against the groove bottom portion of the holder insertion groove. In this state, even if one load acts on the holder, the load is supported between the taper surfaces in the close contact state, so that the holder is not displaced and tilted. When the tightening member is loosened, the restraint by the fixing plate is released, and the ram connection portion becomes slidable in the holder insertion groove.

[0016]

【Example】

 FIG. 1 shows an external view of a press brake according to an embodiment of the present invention, in which a longitudinal table 3 for installing a lower mold 2 on the front surface of a machine body 1 and a ram 4 which is elevated and lowered with respect to the table 3. Are provided to face each other vertically. Hydraulic cylinders 5 and 6 are connected to the shoulders of both ends of the ram 4, respectively, and the hydraulic cylinders 5 and 6 are reciprocally operated by a pedaling operation of a pedal (not shown) to move the ram 4 up and down.

At the lower end of the ram 4, a plurality of holders 7 are arranged side by side in a row, and the upper die 8 is attached to the ram 4 via the holders 7. The upper mold 8 in the illustrated example is shorter than the width of the machine body 1 and is held by five holders 7 arranged at regular intervals. The structure of each holder 7 is illustrated in FIGS. 2 and 3, and the holder 7 of this embodiment includes an adjusting portion 9 and an upper die holding portion 10.

The adjusting portion 9 is a portion for correcting the central portion of the upper die 8 retracting from both end portions when the plate material to be processed is pressed, and is adjusted on the pair of left and right eccentric members 11 and 11, respectively. It has a structure in which mounting plates 13 and 14 are superposed and arranged on both sides of the adjusting plate 12 in the center. Screw holes 17 and 18 into which bolts 15 and 16 are screwed in the rear mounting plate 14, and support holes 19 and 20 in which the bolts 15 and 16 are inserted into the front mounting plate 13 and which supports the heads of the bolts 15 and 16. Are provided in the upper and lower positions, respectively.

Each eccentric member 11 is formed coaxially with respect to the front and rear shaft portions 21 and 22 by eccentricizing an intermediate shaft portion 23, and a tool is inserted into a hexagonal hole 24 provided in an end surface of the front shaft portion 21. Then, the intermediate shaft portion 23 is eccentrically rotated. The rotation angle of each eccentric member 11 is confirmed by the scale provided on the front surface of the mounting plate 13.

The adjusting plate 12 is supported on the intermediate shaft portion 23 of each eccentric member 11, and the front and rear shaft portions 21 and 22 are fitted into shaft holes 25 and 26 provided in the mounting plates 13 and 14, respectively. .

The upper die holding portion 10 is attached to the lower end portion of the adjusting portion 9 via the connection plate 27, and the upper end portion of the connection plate 34 is inserted between the front and rear attachment plates 13 and 14. The upper die holding portion 10 is provided with a pair of front and rear holding pieces 28, 29 for gripping the upper end portion of the upper die 8, and the upper end surfaces of the holding pieces 28, 29 contact the lower end surfaces of the mounting plates 13, 14. In the contacted state, the mounting plates 13 and 14 and the connection plate 34 are tightened and fixed by the bolts 16. In the figure, a bolt 37 is for fastening and fixing the upper end of the upper die 8 between the holding pieces 28, 29.

At the lower end of the ram 4, a holder insertion groove 32 whose lower surface and front surface are opened is formed, and the groove bottom plane of the holder insertion groove 32 serves as a reference surface 31. The adjustment plate 12 of the holder 7 is projected upward to form a ram connection portion 30. The ram connection portion 30 is inserted into the holder insertion groove 32, and the upper end surface of the ram connection portion 30 is pressed against the reference surface 31. is doing.

On the front surface of the ram connection portion 30, an engagement groove 36 is formed linearly along the longitudinal direction of the holder 7, and a taper surface 33 that widens the upper wall surface of the engagement groove 36 to the groove opening side. Has been formed. An engaging groove 37 parallel to the engaging groove 36 is formed on the front surface 34 of the lower end portion of the ram 4, and a lower wall surface of the engaging groove 37 is formed as a tapered surface 33 that expands toward the groove opening side. There is.

A fixing plate 40 is provided between the lower end of the ram 4 and the ram connecting portion 30 of the holder 7 so as to cover the front surface. Engaging projections 41, 42 projecting to the rear surface side are formed at the upper and lower ends of the fixed plate 40 along the longitudinal direction of the fixed plate 40. Tapered surfaces 43, 45 are formed on the inner surfaces of the engaging protrusions 41, 42 to expand toward the protruding base end side. When engaged in 37, the tapered surface 43 of the engaging projection 41 is pressed against the tapered surface 33 of the engaging groove 36, and the tapered surface 45 of the engaging projection 42 is pressed against the tapered surface 35 of the engaging groove 37. To do.

Bolts 50 and 51 for fastening and fixing the fixing plate 40 to the ram 4 are provided at both ends of the fixing plate 40. Both bolts 50 and 51 are inserted into support holes 52 and 53 penetrating the fixing plate 40, and the threaded portion at the tip thereof is screwed into a screw hole (not shown) formed in the ram 4. When the bolts 50 and 51 are tightened, the tightening force acts between the taper surfaces 33 and 43 that come into close contact with each other and pushes up the ram connection portion 30 of the holder 7, whereby the upper end surface of the ram connection portion 30 is moved to the ram 4 The holder 7 is fixed to the ram 4 by the fixing plate 40 while being urged and pressed against the reference surface 31 of.

On the back surface of the fixed plate 40, counterbored holes 55 and 56 are formed outside the support holes 52 and 53, and compression springs 57 and 58 are loaded in the counterbored holes 55 and 56, respectively. ing. The compression springs 57 and 58 act to apply a spring force to the fixing plate 40 to float the fixing plate 40 from the ram 4, so that the holder 7 can be easily moved in the holder insertion groove 32.

In the press brake configured as described above, in order to attach the upper die 8 to the ram 4 via the plurality of holders 7 and the fixing plate 40, the ram connecting portion 30 of each holder 7 is fitted into the holder insertion groove 32 of the ram 4. insert. Next, after mounting the fixing plate 40 so as to cover the lower end portion of the ram 4 and the front surface of the ram connecting portion 30, the bolts 50 and 51 are inserted into the support holes 52 and 53 and screwed into the screw holes of the ram 4, The tightening force causes a wedge action between the tapered surfaces 33 and 43 to push up the ram connecting portion 30 of the holder 7. As a result, the upper end surface of the ram connection portion 30 is pressed against the reference surface 31 of the holder insertion groove 32, and positioning and fixing are completed.

In this state, even if a single load acts on the holder 7, the load is supported between the tapered surfaces 33 and 43 in the close contact state, so that the holder 7 is not displaced and tilted. Further, when the bolts 50 and 51 fastening the fixing plate 40 are loosened, the restraint of the holder 7 by the fixing plate 40 is released, and the spring force of the compression springs 57 and 58 pushes up the fixing plate 40. It is possible to move the connecting portion 30 within the holder insertion groove 32.

[0029]

[Effect of device]

 As described above, the present invention provides a fixing plate having a fixing member for attaching the holder to the lower end of the ram, the fixing plate having an engaging projection that can be engaged with and disengaged from the engaging groove formed on the front surface of the ram connecting portion, and the fixing plate. Between the engaging protrusions of each fixed plate and the engaging groove of each holder, the holder is pushed up by the tightening force of the clamping member and the ram connecting part Since a taper surface for urging the upper end surface of the holder to the groove bottom portion of the holder insertion groove is formed, the holder can be positioned and fixed to the ram by a simple operation of tightening the tightening member.

Further, even if a single load is applied to the holder, the load is supported between the taper surfaces in the close contact state, and therefore the holder is not displaced and tilted. In addition, a holder insertion groove with the lower and front faces opened is formed at the lower end of the ram, and the ram connection part of each holder is inserted into this holder insertion groove and fixed by the fixing plate, so by loosening the tightening member, It is possible to move each holder, and even if the plate to be processed has side plates, or if the length of the upper die does not match the total length of each holder that holds the upper die, Practical effects are remarkable, such as proper bending.

[Submission date] July 30, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, when mounting and fixing the upper die, it is necessary to purposely lower the ram 83 to bring it into a pressurized state and tighten the bolts 91, 97, 98 in that state, so that the upper die ram by the holder 80 is required. It takes time to fix it to 83.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

The upper die holding portion 10 is attached to the lower end portion of the adjusting portion 9 via the connection plate 27, and the upper end portion of the connection plate 27 is inserted between the front and rear attachment plates 13 and 14. The upper die holding portion 10 is provided with a pair of front and rear holding pieces 28, 29 for gripping the upper end portion of the upper die 8, and the upper end surfaces of the holding pieces 28, 29 contact the lower end surfaces of the mounting plates 13, 14. In the contacted state, the mounting plates 13 and 14 and the connection plate 27 are tightened and fixed with bolts 16. In the figure, a bolt 37 is for fastening and fixing the upper end of the upper die 8 between the holding pieces 28, 29.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

On the front surface of the ram connection portion 30, an engagement groove 36 is formed linearly along the longitudinal direction of the holder 7, and a taper surface 33 that widens the upper wall surface of the engagement groove 36 to the groove opening side. Has been formed. An engaging groove 37 parallel to the engaging groove 36 is formed on the front surface 34 of the lower end portion of the ram 4, and a lower wall surface of the engaging groove 37 is formed as a taper surface 35 that expands toward the groove opening side. There is.

[Brief description of drawings]

FIG. 1 is a front view showing the appearance of a press brake according to an embodiment of the present invention.

FIG. 2 is a front view showing a configuration of a holder.

FIG. 3 is a cross-sectional view showing a structure of a holder.

FIG. 4 is a perspective view showing a plate material to be processed having side plates.

FIG. 5 is a front view showing a positioning state of a holder in a conventional press brake during bending.

FIG. 6 is a front view showing a conventional holder.

FIG. 7 is a cross-sectional view showing a conventional holder.

[Explanation of symbols]

 4 Ram 7 Holder 8 Upper Mold 13, 14 Mounting Plate 30 Ram Connection Part 31 Reference Surface 32 Engagement Groove 33, 43 Tapered Surface 40 Fixing Plate 41, 42 Engagement Projection 50, 51 Bolt

Claims (1)

[Scope of utility model registration request] 1. An upper die is attached to a lower end of a ram via a plurality of holders and a plurality of fixing members for individually fixing each holder to the ram, and the ram has a lower surface and a front surface at a lower end. Each holder has a ram connecting portion that can be inserted into and removed from the holder inserting groove at the upper end portion, and an engaging groove is formed on the front surface of the ram connecting portion. And each of the fixing members includes a fixing plate having an engaging projection that can be engaged with and disengaged from the engaging groove, and a tightening member for tightening and fixing the fixing plate to the front surface of the ram. Between the engaging protrusion and the engaging groove of each holder, there is a tapered surface that pushes up the holder by the tightening force of the tightening member and urges the upper end surface of the ram connecting portion toward the groove bottom of the holder inserting groove. A press brake formed and formed.