JPS6225451B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a burring apparatus for a tubular body.

When forming a branch seat in a pipe, burring is often performed, and generally a jig 104 is used, as shown in FIG. Hold the tube body 101 with the screws, drill a pilot hole 105 in the tube body 101 concentrically with the hole 103, and make the plug 106 installed in advance inside the tube stick out of the tube body through the pilot hole 105 and insert it around the pilot hole 105. A burring method has been used in which the portion surrounded by the hole 103 is plastically deformed to form the burring portion 102, but this has the disadvantage that it cannot be mass-produced because the plaque 106 is often worn.

Furthermore, as shown in FIGS. 7 and 8, the tube body 10
7 contains a spherical die 108 and a slide taper cam 10.
9. Insert the guide jig 110 and move the slide taper cam 109 in the direction of arrow A shown in FIG.
There was a method in which 08 was made to protrude outside the tube body 107 and burring was performed.

In this method, it is difficult to manufacture and maintain a jig when applying it to a tube with a small diameter.An even more serious drawback is that the spherical die 108 is not suitable for the slide taper cam 10.
During the process of forming the burring part, the spherical die 108 is pushed up by the guide jig 110 and removed from the fixed guide jig 110.
There was a problem in that the force in the advancing direction was applied to the burring part through the spherical die 108, causing breakage of the burring part and uneven thickness.

The present invention provides a burring processing device that solves these problems, and one embodiment thereof will be described with reference to FIGS. 1 to 5. In the figure, 1 is an upper die, 2 is a lower die, 3 is a spherical punch, 4 is a right pusher, and 5 is a left pusher. Upper die 1
contacts the outer periphery of the tube 6 and presses the tube 6 from above. Further, the lower die 2 is in contact with the outer periphery of the tube 6 and supports the tube 6 from below. Further, the lower die 2 has a hole 8 which is equal to the completed outer diameter of the burring part 7 in order to form a burring part in the tube body 6 in connection with the spherical punch.
has. The right pusher 4 and the left pusher 5 are for pushing down the spherical punch 3 perpendicularly to the axis of the tube body 6, and each of the right pusher 4 and the left pusher 5 has a tapered surface that tapers toward the direction of movement. 9 is formed, and this tapered surface 9
The pushers have sloped surfaces facing each other toward the axis of the tube body 6, and the tips thereof are formed in a semi-cylindrical shape, so that when the left and right pusher tips are brought together, it becomes a cylindrical shape approximately equal to the inner diameter of the tube body 6. Also, Figures 1 and 3
As shown in the figure, the right pusher and the left pusher are arranged so that they can intersect with each other. Next, the operation will be explained. First, as shown in FIG. 2, the tube 6 is held by the upper die 1 and the lower die 2 so as to be concentric with the pilot hole 6A previously drilled in the tube 6 and the hole 8 of the lower die 2. Next, put the spherical punch 3 inside the tube body 6, and move the right pusher 4 and the left pusher 5 into the tube body 6 in opposite directions at the same position and the same speed with respect to the axis of the hole 8 of the lower die 2. By advancing, as shown in FIGS. 3 and 4, the burring portion 7 is formed by causing the spherical punch 3 to protrude outside the tube body 6 along the hole 8. At this time, equal axial force is applied by the left and right pushers 4 and 5, causing the spherical punch 3 to protrude vertically along the hole 8. That is, it is important to prevent the spherical punch 3 from applying pressure to one side of the hole 8 in order to prevent tearing of the burring part 7 and uneven thickness. Tapered surfaces 9 each tapering in the direction of travel
However, at the same time, this tapered surface is inclined opposite to the axis of the tube body 6. As described above, the present invention makes it possible to form a burring close to the pipe diameter on a small-diameter pipe without causing tears or uneven thickness in the burring portion.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a tube processing apparatus according to an embodiment of the present invention, FIGS. 2, 3, and 4 are longitudinal sectional views showing different processing states of the same embodiment of the apparatus according to the present invention, Fig. 5 is a sectional view taken along the - line in Fig. 3, Figs. 6 and 7 are longitudinal sectional views of the conventional device, respectively, and Fig. 8 is an exploded view of the jig installed inside the tube of the device shown in Fig. 7. FIG. 1... Upper die, 2... Lower die, 3... Spherical punch, 4, 5... Pusher, 8... Hole.

Claims (1)

[Claims] 1. An upper die and a lower die that sandwich and hold the pipe body to be machined, a hole formed in the lower die with a diameter approximately equal to the outer diameter of the burring part to be machined, and a hole approximately equal to the inner diameter of the burring part to be machined. a spherical punch having equal diameters and to be placed within the tube;
A pair of tapered surfaces are formed at the tip, and are arranged in a pair in the tubular body, facing each other with the spherical punch in between. It has a semi-cylindrical shape, and the tapered surface is arranged so that the pair of semi-cylindrical parts can intersect with each other in the axial direction of the tube, and the pushers are inclined so as to face each other. A tubular body burring processing device characterized by: