JPH0231207Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention allows holes or protrusions on the outer periphery to be formed at any position along the length of a pipe without distorting the pipe or creating burrs on the inner surface of the pipe. This invention relates to a drilling and burring device that performs burring with a short circumferential wall.

(Prior Art) In order to make a hole in the peripheral wall of a pipe, the hole is made with a punch or a drill while preventing distortion by a protector that closely surrounds the outer circumference of the pipe. There is no conventional device that can make holes by protruding a punch from the inner surface of a pipe without creating burrs on the inner surface of the pipe.In particular, forming a burring hole with a short peripheral wall protruding from the outer periphery is difficult as described above. This is not possible using conventional means such as drilling or punching.

(Problems to be Solved by the Invention) The present invention is directed to a pipe constituting an automobile part or other parts that has a certain length in a straight line from the end end, and a punch is protruded from the inner surface of the straight part at an arbitrary position. The object of the present invention is to develop a drilling and burring device that can drill holes and, in particular, can freely form burring holes having a short circumferential wall on the outer periphery of a pipe.

(Means for solving the problem) The purpose of the present invention is to specifically solve the problem mentioned in the previous section. A hollow insertion rod 1, a protrusion rod 3 having a sharpened portion 4 at its tip and movably inserted into the hollow hole 2 of the insertion rod 1, and a protrusion rod 3 provided at the tip of the hollow insertion rod 1 to prevent movement in the radial direction. A pair of pipe inner wall support members 8 which are generally aligned with the outer peripheral surface of the hollow insertion rod 1 due to the elasticity of springs 7 such as leaf springs, and one pipe inner wall support member 8 can be moved independently to support the support member 8. It consists of a punch 9 that protrudes from the pipe, and a pair of pipe outer periphery support members 10 that are arranged on the outer periphery of the planned hole punching position of the pipe. A first inclined cam 8a is provided on the inner wall support member 8, and the protruding rod 3 is provided with a first inclined cam 8a that moves into contact with the inner wall of the pipe as the sharpened portion 4 of the ejecting rod 3 moves forward.
, and the punch 9 is provided with a second inclined cam 9a that comes into contact with the sharp part 4 as the sharp part 4 advances and causes the pipe outer peripheral support member 10 to move through the die 11. The present invention relates to a characteristic drilling and burring device.

A preferred embodiment of the invention will now be described.

(Embodiment) Figures 1 and 2 are cross-sectional views of the first embodiment of the present invention.
A through hole H shown in Fig. 6 is formed on the outer periphery of the pipe P so that it opens from the inner surface, and in 1, an annular gap S is created on the inner surface of the straight part of the pipe P so that it can be inserted to an appropriate depth. The hollow insertion rod 3 is a protrusion rod that is movably and tightly inserted into the hollow hole 2 of the hollow insertion rod 1, and has an angle on both sides at the tip.
A wedge-shaped sharp portion 4 having an angle of about 60° is provided. The hollow insertion rod 1 is provided with sliding grooves 5, 5 in a symmetrical shape such as a circular shape,
A pair of pipe inner wall support members 8, 8 that move in the radial direction of the pipe P are slidably fitted into each of the sliding grooves 5, 5, and come into contact with shelf surfaces 6, 6 provided on one side of the sliding groove 5. The springs 7, 7 of the plate springs etc.
In the normal state, the springs 7, 7 extend linearly as shown in FIG.
A punch 9 that is movable in the radial direction is provided approximately in the center of the punch 9. The inner ends of the pipe inner wall support members 8, 8 protrude into the hollow hole 2 until they engage the slope of the sharp portion 4 and come into contact with the inner surface of the pipe P as the protruding rod 3 advances as shown in FIG. The first that causes movement
The punch 9 is made to further protrude into the hollow hole 2 from one of the punch inner wall supporting members 8, and the protruding part engages with the slope of the sharp part 4, so that the tip is attached to the outer periphery of the bread P. A second inclined cam 9a is formed to protrude.

In addition, a pair of punch outer periphery support members 10, 10 are provided corresponding to the outer periphery of the planned drilling position of the through hole H formed in the pipe P, and one support member 10 has a die 11 corresponding to the punch 9 and a die 11 for discharging punched waste. A hole 12 is provided so that the support member 10 can be moved in the directions of the arrows zx and y. 13 is the waste discharge hole 1
Insert it from 2 and hit it against the punch 9, and then press the punch 9.
This is a push-back rod that returns the holder to the position shown in Figure 1.

3 and 4 illustrate a burring forming apparatus for forming a burring B provided with a short circumferential wall B' protruding from the outer periphery as shown in FIGS. 7 and 8.
In this case, a small-diameter through-hole H' is formed in the pipe, and the burring peripheral wall B' is formed by expanding the through-hole H' with a burring punch 9, but otherwise the structure is the same as shown in Figures 1 and 2. is the same as Fifth
The figure is a plan view of the hollow insertion rod 1 and the like.

(Function) The present invention grips the portion of the pipe P shown in FIGS.
With the ejection rod 3 retracted, the hollow insertion rod 1 is inserted without contacting the inner surface of the pipe P, the punch 9 is aligned with the die 11, and the ejection rod 3 and the inside of the hollow hole 2 are simultaneously inserted. When pushed in the direction, the slope of the sharp portion 4 comes into contact with the first inclined cams 8a, 8a, and the pipe inner wall support members 8, 8 are projected onto the inner surface of the pipe P as shown in FIGS. 2 and 4, and at that time, the plate The spring 7 is bent to allow the members 8, 8 to move. Next, the second inclined cam 9a of the punch 9 pierces the wall surface of the pipe P using the inclined surface of the sharp portion 4, and punches a hole H through the die 11.

When performing burring forming, a through hole H' smaller than the outer diameter of the punch 9 is provided in the pipe P as shown in Figure 3, and the punch 9 is moved radially from the inner surface of the pipe P as shown in Figures 4 and 7. Perform burring molding.

After the burring is completed, the ejecting rod 3 is retracted and the punch 9 is pushed back to the position shown in FIGS. 1 and 3 by the pushing rod 13 or other arbitrary means. The pipe inner wall support members 8, 8 return to the positions shown in FIGS. 1 and 3 due to the elasticity of the springs 7, 7 extending.

(Effects) The present invention has the above-described structure and operation, and after inserting the hollow insertion rod 1 to an arbitrary position in the pipe P,
The ejecting rod 3 is advanced and the sharp portion 4 is brought into contact with the first inclined cam 8aa, and the pipe inner wall support member 8,
8 to fix the pipe P from the inside, then the second
The inclined cam 9a is brought into contact with the sharp part 4 to push out the punch 9, thereby forming a through hole or burring, and then the ejecting rod 3 is moved back to loosen the fixation of the pipe P by the pipe inner wall support members 8, 8. , further return the punch 9 appropriately, and then insert the hollow insertion rod 1.
By repeating the operation of pulling out the pipe P from the pipe P, a hole can be made, and this has the effect of preventing burrs from forming on the inner surface of the pipe due to the drilling.

[Brief explanation of the drawing]

1 and 2 illustrate a drilling device for drilling a through hole H, with FIG. 1 being a longitudinal sectional side view, and FIG. 2 being a longitudinal sectional side view showing the drilling operation. 3 and 4 show an example of a burring device for forming the burring B, and FIG. 3 is a longitudinal side view, and FIG. 4 is a longitudinal side view showing the operation of forming the burring B. Fig. 5 is a plan view of the hollow insertion rod 1 etc. common to Figs. 1 and 3, Fig. 6 is a perspective view of the through hole H formed in the pipe P, and Figs. FIG.

Claims (1)

[Scope of utility model registration request] A hollow insertion rod 1 that is inserted to an appropriate depth without contacting the inner surface of the pipe P, and a protrusion rod 3 that is movably inserted into the hollow hole 2 of the insertion rod 1 with a sharp portion 4 formed at the tip; A pair of pipe inner wall support members 8 are provided at the tip of the hollow insertion rod 1 to enable movement in the radial direction, and in a normal state, due to the elasticity of the springs 7, the pair of pipe inner wall support members 8 substantially coincide with the outer peripheral surface of the hollow insertion rod 1, and one pipe inner wall. The pipe outer periphery support member 1 consists of a punch 9 that is made to protrude from the support member 8 by independent movement, and a pair of pipe outer periphery support members 10 that are arranged on the outer periphery of the planned hole drilling position of the pipe.
0 is provided with a die 11 corresponding to the punch 9,
A first inclined cam 8a that moves into contact with a pair of pipe inner wall support members 8 by moving the sharp part 4 of the protruding rod 3 into contact with the sharp part 4 and coming into contact with the pipe inner wall.
, and the punch 9 is provided with a second inclined cam 9a that comes into contact with the sharp part 4 as the sharp part 4 advances and causes the pipe outer peripheral support member 10 to move through the die 11. Characteristic drilling and burring equipment.