JP2569866B2 - Press equipment and processing method for burring - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a burring press apparatus and a processing method.

[Prior Art] FIG. 9 (a) shows a first step of a first conventional example of a burring method, in which a hole is drilled in a plate 14 to be processed by a punch 11 and a die 12, and FIG. (B) shows a burring method in which burring is performed on the prepared hole formed in the previous step by the burring punch 21 and the burring die 22 in the second step. Reference numerals 13 and 23 denote pads for pressing the plates 14 and 24 to be processed.

FIG. 10 shows a second conventional example.
It is published by. A punch 31 fixed to the upper die 35 and a punch die 32 fixed to the lower die 36 are opposed to each other, and an upper outer surface of the punch 32 is formed on a bending blade 32a, and the punch 31 and the punch are formed. The dies 32 are vertically movably fitted to the burring dies 33b and the lower pads 33a that sandwich the work plate 34 at the respective tip surfaces, and the lower inner surface of the burring dies 33b and the upper inner surface of the lower pad 33a are Die bending blade 32a
A spring having a different spring constant is inserted between the upper die, the lower die, and the pad to enable drilling and burring in one stroke.

[Problems to be solved by the invention]

As described above, the conventional burring apparatus includes the first conventional example in which the pre-drilling and the burring are performed in two steps and the second conventional example in which the piercing is performed in one step. Also, when the burring height shown in FIG. 5H must be accurately machined, there is a disadvantage that the pilot hole dimensions must be precisely determined.

An object of the present invention is to provide a press apparatus and a processing method for burring capable of accurately processing the burring height even when the burring is performed in a single step and the pilot hole diameter is in a wide range. To offer.

[Means for solving the problem]

The burring processing means of the present invention includes a first punch portion 1a mounted on a punch holder 5 and also serving as a bending blade and a cutting blade, and a pilot hole protruding from a tip end surface of the first punch portion and opening a prepared hole in the plate 4 to be processed. A punch 1 comprising a second punch portion 1b for making a hole (preparing without a corresponding die on the lower side of the punch);
A first die part having a depth h for performing burring to form a flange around the prepared hole drilled in the work plate 4 in cooperation with the first punch part 1a mounted on the die holder 6
A die 2 comprising a second die portion 2b connected to the first die portion and cutting the flange at a desired height in cooperation with the first punch 1a; and a die provided on the punch holder. And a pad 3 for pressing and holding the processing plate 4 on the die side.

[Action]

When the plate to be processed is strongly clamped between the die and the pad and fixed to the upper surface of the die, and the punch centered with the die is lowered, the second punch portion hits the plate to be processed in the first stage and drills a hole in the air. In the second stage, the punch is further lowered, and a burring process is performed by the bending blade portion at the tip of the first punch portion 1a and the first die portion 2a. In the third stage, the first punch portion 1a further The first die reaches the entrance of die 2b
Excess material protruding from the tip of the punch 1a is subjected to shearing by the cutting edge of the second punch 1a, and the above first to third steps are performed in one stroke.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 is a cross-sectional view near a pair of dies, FIG. 2 is a double-sided view of a punch having a pre-drilling function, FIGS. 3 and 4 are double-sided views of a punch that punches a pre-drilled hole, and FIG. Perspective view of a flange portion manufactured by a mold, FIG.
FIG. 7 is a diagram for explaining the operation of the burring method, FIG. 7 is a diagram in which a burring die is experimentally attached to a press device, and FIG. 8 is a diagram showing a punch projection (for the burring height h when the plate thickness t = 0.7 or 1.2). 2 is a table showing a selection range of a diameter dφ of a (2 punch portion).

The punch 1 shown in FIG. 2 is formed of a first punch portion 1a and a second punch portion 1b, both of which are cylindrical, and the second punch portion 1b protrudes from the tip of the large-diameter first punch portion 1a. It is necessary that the first shoulder R of the punch shown in FIG. 2 has both functions as a burring bending blade and a shearing cutting edge, and the latter has a cutting edge function of R = 0, and the bending blade has some functions. There must be R. Thus, as an example, a bending blade having a certain cutting blade function was set to R = 1 mm.

A die 2 is installed facing the punch 1 as shown in FIG. 1, and a pad 3 is arranged concentrically outside the punch to press a work plate 4 in the direction of the die 2. The diameter of the entrance of the die 2, that is, the diameter of the first die portion 2a is substantially (D + 2t), where t is the thickness of the workpiece plate 4 and D is the diameter of the first punch 1a, and the depth is the burring height of the product. H.
A second die portion 2b having a diameter D through which the first punch 1a passes is provided continuously behind the first die portion.

FIG. 7 is a view showing a state in which the punching burring dies 1 and 2 are mounted on a press machine. In order to simplify the mold structure, the pressure source of the pad uses the cushion of the press machine, and the normal mold is inverted. They are looking good. In order to take out the product from the processed mold, four commercially available ejectors (not shown) are used on the die 2 side.

 Next, the operation of the above embodiment will be described.

In FIG. 6 (a), an aerial hole is started by the second punch portion 1b, in FIG. 6 (b), a hole corresponding to the conventional hole of the burring is aerial drilled, and in FIG. The shape of the plate to be processed is made lower and flatter than when the shoulder R of the first punch portion 1a touches the plate to be processed. (D) In the figure, the burring proceeds at the shoulder portion of the first punch portion 1a and the side surface of the punch, and the burring height increases.
(E) In the figure, the flange forming advances to the flange tip and shears the surplus material. (F) shows a state in which the surplus material is sheared to complete the burring process.

If the height H of the second punch portion 1b shown in FIG. 8 (a) is low, the shoulder of the first punch portion 1a touches the material intensively before the second punch portion cuts the work plate in the air. Punch cutting without burring. Therefore, if the punch projection height H is 5 mm or more in the punching burring, the burring inner diameter D = 32 m
In the case of m, molding is possible, but in view of the safe side in molding, H was set to 7 mm in the example.

Further, the selection range of the punch protrusion diameter dφ in the punching burring is as follows: plate thickness t = 0.7, 12 mm, and second punch diameter D = 3.
The relationship with the burring height h when the length is 2 mm is as shown in FIG. 8 (b).

〔The invention's effect〕

Since the present invention is configured as described above, aerial drilling,
It is possible to provide a burring press apparatus and a burring method capable of reliably performing burring and accurate setting of the burring height in one stroke.

[Brief description of the drawings]

1 is a cross-sectional view of a pair of burring dies, FIG. 2 is a double-sided view of a punch having a pre-drilling function, FIGS. 3 and 4 are double-sided views of a punch having a piercing function, and FIG. 6 is a perspective view of a flange portion manufactured by the method, FIG. 6 is an explanatory diagram of processing by a mold, FIG. 7 is a view showing a situation where a burring die is attached to a press device, FIG. 8 is a table showing experimental data of punching burring, and FIG. FIG. 1 is a drawing corresponding to FIG. 1 of the first conventional example,
FIG. 10 is a diagram corresponding to FIG. 7 of the second conventional example. 1 ... Punch, 1a ... First punch, 1b ... Second punch, 2 ... Dice, 2a ... First die, 2b ... Second die, 3 ... Pad, 4 ... Workpiece plate, 5: punch holder, 6: die holder

Claims (2)

(57) [Claims] 1. A first punch portion (1a) mounted on a punch holder (5) and serving also as a bending blade and a cutting blade, and a first punch portion protruding from a tip end surface of the first punch portion and lowering a work plate (4). A punch (1) comprising a second punch portion (1b) for making a hole in the air; and a pilot hole mounted on a die holder (6) and formed together with the first punch portion on a work plate (4). A first die portion (2a) having a depth (h) for performing burring to form a flange around the first die portion, and the flange is formed in a desired shape in cooperation with the first die portion in cooperation with the first punch portion. A die (2) comprising a second die part (2b) cut at a height;
A burring press apparatus comprising: a pad (3) provided on the punch holder to press and hold a work plate (4) on the die side. 2. A punch having a first punch portion and a second punch portion protruding from a front end face of the first punch portion,
The first to perform burring on the plate in cooperation with the punch
A first stage in which a die having a die portion is brought close to the die, a work plate pressed and fixed to the die with a pad is drilled in the air by a second punch portion, and a work is performed by a bending blade function at the tip of the first punch portion. The second stage of projecting the plate into the first die portion to perform burring, and the third stage of shearing excess material to determine the burring height by the cutting edge function of the tip of the first punch portion are performed in one stroke. A burring method characterized by performing.