JPH0242338Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a burring head for pipes, and particularly to a burring head suitable for rotary burring.

[Background of the idea]

In general, there are two types of burring methods: one is to form the product by simply pulling it out without rotating the punch, and the other is to form the product by pulling it out while rotating the burring head.

In the non-rotational molding method described above, the roundness of the molded part is good, but not only does the punch require a perfect shape, but also a large force is required to pull it out.

In the rotational molding method described later, the burring head does not need to have a full shape, and furthermore, the pulling force is only about 1/3 of that in the non-rotational molding method.

Both conventional non-rotating and rotating burring methods have the following problems.

For example, as shown in FIG.
When attempting to perform burring by pulling out the punch 12, in the non-rotational molding method, the punch 12 naturally cannot be inserted through the prepared hole because of its full shape. Therefore, it is necessary to push the punch 12 through the tube hole and position it at a predetermined location.

Also, in the rotational molding method, if the burring head rotates and forms a trapezoidal thin plate, the burring head cannot be inserted through the pilot hole, as with the punch in the non-rotational molding method, and is forced into the pipe hole to form the burring head. It is necessary to position it in place.

As explained above, if the burring head cannot be inserted through the pilot hole of the burring part, it will not only take a lot of work time to position the burring head because it will have to be inserted into the pipe hole and positioned in the burring part before being connected to the machine. , may damage the raw pipe. This problem is noticeable when burring a large and long raw pipe.

Conventionally, this type of burring punch,
Alternatively, it is known that the head is of an integral type or a divided type, and is formed by inserting the head into a hole in the raw pipe, making it into a complete shape, and then pulling it out. Incidentally, related devices of this type include, for example, Japanese Patent Application Laid-open No. 1986-
Examples include No. 90323 and Utility Model Application No. 57-82424.

[Purpose of invention]

The purpose of this invention is to have good workability, to be able to process with the same machining head even if the hole diameter of the burring part changes, and to be easy to process even if the pipe is made of relatively hard material. An object of the present invention is to provide a head for pipe burring that can be performed in a number of ways.

[Summary of the idea]

In the present invention, an adjustment shaft is fitted into a shank that is rotatably provided in a burring machine and is movable in the radial direction of the pipe, and an adjustment shaft is fitted so as to be slidable in the axial direction of the shank, and one end of each of a plurality of forming bars is provided. is coupled to the tip of the adjustment shaft via a pin, and the other ends of each of the plurality of forming bars are connected to a portion protruding from the shank tip of the adjustment shaft via a plurality of corresponding links, respectively; The forming bar is connected to the link, and the link and the adjustment shaft are connected to each other via pins.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIG. In Fig. 1, 1 is a raw pipe with a prepared hole in the burring part, 2 is a shank installed in a burring machine (not shown) so that it can rotate and move up and down, and 3 is inside the shank 2 in the vertical direction. 4 is a rack provided on the adjustment shaft 3; 5 is a pinion provided on the shank 2 and meshed with the rack 4; 6 is a pin 7 with one end attached to the tip of the shank 2; The other end of the combined forming bar is connected to the tip of the adjustment shaft 3 via pin 8, link 9, and pin 10, and the forming bar 6
A plurality of links 9 are arranged at the tip of the shank 2 to form a burring head.

In the above-described configuration, when performing burring, first, the pinion 5 and rack 4 slide the adjustment shaft 3 in the direction of the dotted arrow shown in the figure, thereby extending the forming bar 6 and the link 9 to adjust their outer diameter. Make smaller. Next, after lowering the shank 2 and inserting the burring head into the prepared hole of the raw pipe 1, the forming bar 6 and link 9 are reduced to the position shown by sliding the adjustment shaft 3 in the direction of the solid arrow shown in the figure. to form a predetermined burring diameter, and by raising the shank 2 while rotating with the burring machine,
The raw pipe 1 can be burred.

According to this embodiment, the outer diameter of the burring head can be made smaller so that it can be inserted into the mother tube through the pilot hole of the mother tube, and by expanding and contracting the adjustment shaft, the forming angle of the forming bar and the burring processing diameter can be changed. can be changed arbitrarily.

In addition, by maximizing the lengths of the forming bar 6 and link 9, taking into account the reduction in strength, it is possible to process holes with a diameter larger than the diameter of the shank 2, as well as holes with a relatively large diameter. I can do it. Furthermore, since the tip of the forming bar 6 is supported by the link 9, the forming bar 6 can be firmly held during machining, so the base pipe 1 is made of a relatively hard material. Processing can be performed even if the material is

[Effect of idea]

As explained above, according to the present invention, the burring head can be easily inserted into the pilot hole of the raw tube during burring of the tube, and work efficiency can be improved. In addition, burring of different hole diameters can be processed with the same processing head simply by adjusting the protrusion amount of the adjustment shaft.
Moreover, it has the effect that even a tube made of a relatively hard material can be processed.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of burring using a burring head according to the present invention, and FIG. 2 is a longitudinal sectional view showing an example of burring using a conventional punch. 1...Main pipe, 2...Shank, 3...Adjustment shaft,
4...Rack, 5...Pinion, 6...Forming bar, 7, 8, 10...Pin, 9...Link, 12...Punch.

Claims (1)

[Scope of utility model registration request] An adjustment shaft is fitted into a shank that is rotatably provided on the burring machine and is movable in the radial direction of the pipe so as to be slidable in the axial direction of the shank, and one end of each of the plurality of forming bars is connected to the adjustment shaft. is coupled to the tip of the forming bar via a pin, and the other ends of the plurality of forming bars are respectively connected to a portion protruding from the shank tip of the adjustment shaft via a plurality of corresponding links, and the forming bar is connected to the tip of the forming bar through a pin. A head for burring a pipe, characterized in that the link and the adjustment shaft are connected via pins.