JPS607851Y2 - Press machine with positioning function - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a press machine used for bending sheet metal.

Conventionally, a press brake, which is a press machine used for bending sheet metal, has been provided with a special stopper by the press brake manufacturer for use in positioning the sheet metal when bending the sheet metal.

However, since this dedicated stopper is installed on the back side of the machine, it is not used because it is difficult to use and there is very little benefit from using it.

On the other hand, even if sheet metal parts having a plurality of bending angles have the same external dimensions, if the sheet metal parts have different thicknesses, the bending positions will differ and the unfolded dimensions will also differ.

For this reason, in order to determine the unfolded dimensions and bending position of a sheet metal, several test pieces were bent and their trends were ascertained.

However, even if the bending position is the same, the fit to the press brake upper mold is not uniform, resulting in uneven bending dimensions, making it difficult to obtain reliable data on unfolded dimensions.

Furthermore, when bending a sheet metal part using a press brake, it is necessary to support the part with one's hand, and there is a danger of one's hand being caught between the upper and lower dies.

In view of the above, this idea was developed when bending sheet metal parts.
By bending a single test piece regardless of the thickness of the sheet metal, it is possible to accurately determine the bending position and unfolded dimensions of the sheet metal, and it also eliminates wasted time such as marking the bending lines, which can occur during press processing. The purpose of this invention is to provide a press machine that can eliminate anticipated disasters.

Next, this invention will be explained based on embodiments shown in the drawings.

In the figure, a press brake 1, which is a machine for bending long sheet metal, has a C-shaped frame structure, and includes a lower frame 2 and an upper frame 3.

On the front surface of the lower frame 2, a tool support stand 4 is attached to the lower frame 2 so as to be slidable in the vertical direction.

A lower die 6 for bending is attached to the upper surface of the tool support 4 via a long pedestal 5 having a rectangular cross section.

The lower die 6 is a long member.

On the upper surface thereof, a ■-shaped i6a is provided in the longitudinal direction (the lower mold 6 shown in FIG. 1 has two V-grooves 6a provided in horizontal parallel).

). On the front surfaces of the pair of upper frames 3, 3, a long support plate 8 is provided above the tool support 4 and in parallel with the tool support 4, for attaching the upper mold 7 for bending to the lower part thereof.

The upper mold 7 attached to the lower part of the support plate 8 has a plate shape, and the lower end thereof has a V-shaped bent edge 7a.

The length of the lower mold 6 and the upper mold 7 is longer than the width of the plate material to be bent by these molds.

A foot lever 9 is provided at the lower front of the press brake 1, and when an operator steps on this foot lever 9, the tool support base 4 moves upward.

The slide base 10 is a block member having protrusions 11 and 11a formed on the upper and lower sides, and has two mounting holes 12 formed therein.

This slide base 10 has a protrusion 11. With the lla facing forward, an appropriate number of tools are horizontally attached to the upper part of the front surface of the tool support base 4 at a predetermined interval (an interval at which a slider 14, which will be described later, can be inserted) by fitting bolts 13.

The slider 14 has a front plate 15. It is a member having a U-shaped cross section consisting of a top plate 16 and a bottom plate 17, and the ends of the top plate 16 and bottom plate 17 are bent in directions facing each other to form locking pieces 16a and 17a.

The slider 14 has upper and lower projections 11 of the slide base 10 between the upper and lower locking pieces 16a and 17a and the front plate 15.
There are grooves 18 and 19 into which the lla is inserted.

Further, the slider 14 has three screw holes 20 formed in the top plate 16.

The scale holder 21 is a band-shaped member having approximately the same width as the slider 14 and a rectangular cross section, and a long groove 22 for fitting the scale 24 is provided in the longitudinal direction of its upper surface.

The scale holder 21 has a pair of mounting holes 23 formed on both sides of a long groove 22 at one end.

This scale holder 21 is installed by placing the end on the hole 23 side on the locking piece 16a side of the top plate 16 of the slider 14 and then placing it on the top plate 16. is attached to the slider 14 by screwing bolts 25 into each screw hole 20 of the slider 14.

As described above, the slider 14 with the scale holder 21 attached thereto is inserted into one slide base 1 attached to the tool support 4 via the upper and lower grooves 18 and 19.
0, the scale 24a of the scale 24 attached to the scale holder 21 is parallel to the bending edge 7a of the upper mold 7.

The scale 24 is fixed to the scale holder 21 by appropriate means, such as adhesive, at a position where the scale 24a indicates the distance from the bending edge 7a of the upper mold 7.

The stopper member 26 is attached to the scale holder 21 so as to be slidable in its longitudinal direction.

This stopper member 26 has a rear end of the upper plate 27 connected to the scale 24.
The main stopper 28 is formed parallel to the scale 24a.

Further, the stopper member 26 is provided with an auxiliary stopper 29 protruding from its side, and its front end surface 29a is also provided with the scale 2.
It is parallel to the scale 24a of 4.

The stopper member 26 has a hole 27a formed in the upper plate 27.
The position of the front end surface 29a of the auxiliary stopper 29 is set on the scale 2.
A guide (not shown) for reading at 4 is attached.

The stopper member 26 is fixed to the scale holder 21 by screwing a fixing screw 31 into a screw hole 30 provided in its side wall.

Reference numeral 32 denotes an auxiliary scale holder used when bending a long sheet metal, and is manufactured in the same shape as the scale holder 21 except for the protrusion 23a at the tip.

This auxiliary scale holder 32 has its protrusion 32a attached to the front end of the scale holder 21 with four screws 33.

Next, the operation of this embodiment will be explained.

As shown in Figure 3A, a rectangular sheet metal W with a width of W and a thickness of t is bent at the first bent part A at 90 degrees with respect to the center part B.
0 degrees bend, and the second bent part C on the opposite side to the first bent part A is aligned with the first bent part A and 18
The following explanation assumes that a single-shaped bending process is performed, which is bent in the opposite direction by 0 degrees.

First, ignoring the plate thickness t, calculate the dimension of the first bent part A and call it a.

Similarly, the dimension of the central portion B is b1, and the dimension of the second bent portion C is C.

Then, as shown in the opening of Figure 3, a test piece P□ having a length of a + b + 01 and a width of W is manufactured.

Next, a pair of sliders 14., each having a scale holder 21 inserted thereinto, are inserted into the two slide bases 10, 10, which are located at appropriate positions to support the test piece P1.
14 and adjust its position so that the distance between both scale holders 21 and 21 is slightly narrower than the width W of the test piece P1.

Next, the position of each stopper member 26 of both scale holders 21.21 is adjusted until the distance between each main stopper 28.28 and the bending edge 7a of the upper mold 7 is 10c (the third
(See Figure C) Adjustment is made via the scale 24, and each stopper member 26 is fixed to each scale holder 21 at this position by a fixing screw 31.

In this state, place the test piece P□ on both scale holders 21.
21, and its front end in the longitudinal direction is placed on each stopper 2.
6 (see Fig. 3 C and Fig. 4).

In this way, the test piece P is
When □ is supported, the rear end of the test piece P□ protrudes to the rear of the lower die 6.

Next, press foot lever 9 and press brake 1.
When activated, the tool support stand 4 rises and the lower mold ■
A test piece P□ is sandwiched between the groove 6a and the bending edge 7a of the upper mold 7, and a first bending portion A is formed.

Next, by sliding both sliders 14.14 on the slide bases 10, 10, or moving one slider 14 on one slide base 10, the distance between both scale holders 21.21 is adjusted to the test piece P1. Width W
Make it slightly wider.

Next, the fixing screw 31 is loosened, the stopper member 26 is slid on the scale holder 21, and the distance between the stopper surface 29a of the auxiliary stopper 29 and the bending edge 7a of the upper mold 7 is tested via the scale 24. The length b of the center part B of the piece P□ is set, and the stopper member 26 is fixed to the scale holder 21 at this position with the fixing screw 31.

Similarly, the stopper member 2 of the other scale holder 21
6. Perform positioning.

Next, the test piece P1 is placed on both scale holders 21 with the first bent part A of the test piece P1 facing downward.
．． 21, and the inner surface of the first bent part A is connected to each stopper surface 29a, 29 of both auxiliary stoppers 29.29.
9 a (see Figures 3-2 and 5).

In this state, when the foot lever 9 is pressed and the press brake 1 is activated again, the tool support base 4 is raised and the test piece P1 is bent by the upper and lower dies 7 and 6, and the second bending portion C is formed.

After the bending is completed as described above, test piece P1
When a product W□ is manufactured from the above, the dimensions of each part of this product W□ are measured except for the plate thickness t.

As a result of the measurement, as shown in Figure 3 E, the dimensions of the first bent part A are a-1, the dimensions of the central part B are b-2, and the dimensions of the second bent part C are c-1. , it is assumed that the dimensions are insufficient for each of the regular dimensions a, b, and c of this product.

In this case, the expanded dimensions of the sheet metal shown in the opening of FIG. 3 are expanded by adding the missing dimensions as shown in FIG. 3 to obtain the regular blanking dimensions.

In addition, when correcting the position of the stopper member 26, in the case of Fig. 3 in which the main stopper 28 is used, the distance 0 c is corrected to b 0 c + 3, and in the case of Fig. 3 2 in which the auxiliary stopper 29 is used. In this case, the distance is corrected so that it becomes b+2.

Then, the press brake 1 is used to bend the sheet metal having the regular blanking dimensions according to the above-described procedure.

As mentioned above, this idea uses an appropriate number of slide bases attached to the front of the tool support stand that supports the lower die for a press machine that bends sheet metal, and these slide bases allow the press machine to slide horizontally. A pair of scale holders are movably supported and protrude in front of the tool support base, and a stopper member that is slidable on the scale holders is provided. A main stopper that determines the bending position of the sheet metal placed on the scale holder via the scale, and an auxiliary stopper that supports the sheet metal and comes into contact with the rear surface of the bent piece to determine the bending position of the sheet metal are provided. This has the following effects.

(1) For products with multiple bending angles, accurate unfolded dimensions can be obtained by bending a single test piece.

(2) The sheet metal can be bent from an accurate bending position without marking the bending position on the sheet metal.

(3) When bending with a press machine, there is no need to support the workpiece by hand after positioning with the stopper member, which prevents possible accidents such as getting your hands caught between the bending dies. can do.

(4) The positioning of the workpiece relative to the press machine was conventionally done in two ways.
This was previously done by humans, but it can now be done by one person, reducing the number of man-hours required.

[Brief explanation of drawings]

The figures show one embodiment of this invention, in which Fig. 1 is a perspective view of the press brake, Fig. 2 is a perspective view of the scale holder and auxiliary scale holder to which the slide base, slider, and stopper member are attached, and Fig. 3 is a perspective view of the press brake. Fig. 4 is a perspective view showing the state in which a sheet metal is bent using the main stopper of the stopper member, and Fig. 5 is an explanatory diagram of the process until the unfolded dimensions of a workpiece having two bent parts are obtained. FIG. 6 is a perspective view showing a state in which a workpiece having a bending piece is bent using an auxiliary stopper of the auxiliary stopper member. 1...Press brake, 2...Lower frame, 3...Upper frame, 4...
Tool support stand, 6...Slide base, 7...
...Upper mold, 7a...Bending edge, 10
...Slide base, 14 ...Slider, 21 ...Scale holder, 24 ...
・Scale, 26... Stopper member, 28...
...Main stopper, 29...Auxiliary stopper.

Claims (1)

[Scope of utility model registration request] A press machine that bends sheet metal by moving either an upper die attached to the upper frame side with a straight bending edge or a lower die attached to the lower frame side toward the other die. There are an appropriate number of slide bases installed horizontally in front of the tool support base that supports the lower die, and the upper die can slide horizontally at right angles to the vertical plane including the bending edge. A pair of scale holders supported by a slide base and a stopper member that can slide on the scale holder are provided, and the stopper member is further provided with a scale that is placed on the scale holder via a scale provided on the top surface of the scale holder. A press machine having a positioning function, characterized in that it is provided with a main stopper that determines the bending position of the sheet metal, and an auxiliary stopper that supports the sheet metal and comes into contact with the rear surface of the bent piece to determine the bending position of the sheet metal.