JPS59124502A - Drilling device of valve hole - Google Patents

Abstract

PURPOSE:To enable a valve mounting hole to be machined as required without causing any deformation of a rim, by machining the valve mounting hole by means of drills sliding in the vertical direction from both inner and outer sides in relation to the rim in a 2-piece wheel constituted by shrinkage fitting the rim to a disc. CONSTITUTION:When a valve mounting hole is drilled in a rim 1 in a 2-piece wheel, first, the rim 1 is placed on a bed 13 and positioned in the horizontal direction by an adjusting plate 14 attachably provided in a fixing tool 16 moved by a cylinder 15. Next, a cylinder 19 is actuated, and an upper retainer 20 is turned downward around a supporting axis A to hold the rim 1 between the upper retainer and the bed 13. The hole having a round face (r) in its upper edge is drilled by an upper drill 11 turned by a motor 17 in relation to the rim 1 fixed in such way as in the above, while the bottom edge of the hole is chamfered by a bottom drill 12 turned by a motor 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulp hole processing machine for a rim of a one-piece wheel in which a rim and a disk are fitted and integrated by shrink fitting.

The air pulp attachment port of the tubeless breath ring has 5 holes on the outer periphery to make it easy for the air pulp to be inserted and to prevent scratches.
has an r-plane and a 0-plane on the inner circumferential side. (Figure 1)
Conventionally, in the air pulp attachment port, a hole is punched out using a press, and at the same time, the r surface is also machined, and the 0 surface on the inner peripheral side is cut with a chamfering tool.

However, the rim and disc are fitted by shrink fitting.
In the case of a one-piece wheel, punching out the valve mounting hole is not done due to the accuracy of the rim.

That is, in the above-mentioned copy wheel, the rim is joined by surface pressure acting on the joint surface due to the balance between the tensile stress generated in the rim cross section and the compressive stress generated in the disk, and local deformation of the rim, change in the inner diameter, etc. This is absolutely unacceptable as it will impede the 'hE-' of the bonding surface. Therefore, it is necessary to cut the valve mounting hole of the two-piece wheel so that it does not extend to other parts and cause deformation such as distortion.

For the reasons mentioned above, the purpose of the present invention is to provide a 2-piece wheel pulp mounting hole making device that can quickly and efficiently form a hole with a predetermined shape and zero dimensions by cutting. This is a machine that uses a drill that slides vertically on a rim fixed by a lower mold and an upper mold to form the valve mounting hole from both the outer and inner peripheral sides.

Embodiments according to the present invention will be described in detail below based on the drawings. (Figure 1, Figure 3) Water device r; Position the upper drill (//) and lower drill (/2) on the xx-X line, and the above drill (//)% (/co)
are attached to each motor (/7), (/f)
It can be rotated and slid in the vertical direction.

On the other hand, the table (/3) on which the rim (1) on which the valve mounting hole will be machined is placed is the upper drill (//) and the lower drill (/2).
) and is attached to both sides of the top rill (//) operated by the cylinder C/j') K.

By the way, the upper drill (//) has an r-plane with the same curvature at the stepped part so that it can machine the r-plane shown in Fig. 1, and the -blade type drill (
/2) also has a conical tip for processing the zero surface.

Below, we will explain the processing procedure for the valve mounting hole (B). First, the rim (1) is placed on the stand (/3), and the cylinder (/
The fixture (/B) is moved by the operation of S), and the fixture (/L) is moved.
) with the adjustment plate (/) attached to the upper presser foot (,1ll)), which uses the point (A) as the fulcrum and levers the cylinder (/) acting on the point CB). Press it to ζ level (/3). The upper presser foot (20) has a predetermined curvature to match the curvature of the rim (1), and presses the drop portion (3).

Also, the above stand (/3) and adjustment plate (/ri) are rims (1)
It can deal with changes in size, especially rim width, and can be changed so that the central axis of the cross section is always on the X-X line.

The rim (1), positioned and fixed in this way, is penetrated with an upper drill (/l) rotated by a motor (/7), and then drilled with the motor (/za). Surface 0 is machined with the rotating lower drill (/2).

As described above, this is a valve hole drilling machine according to the present invention, and the rim is formed by drilling the hole through plastic working. Therefore, it is possible to improve the bonding state between the rim (1) and the disk of a shrink-fitted wheel constructed using the rim (1), and to provide a wheel with stable strength.

In addition, this device can be easily and quickly positioned and fixed by simply placing the rim (1) on the stand (/3) using the fixture (/6) and the upper presser (20), and can be easily fully automated.

Furthermore, changes in the size of the rim (1) can be easily accommodated by replacing the stand (/3), adjustment plate (/4t), and upper presser.

[Brief explanation of the drawing]

FIG. 7 shows a cross-sectional view of a valve mounting hole provided in the rim drop part, and FIGS. 2 and 3 show a device according to the present invention, with FIG. 1 being a front view, FIG. 3 being a side view, and FIG. The diagram shows the tip of the upper drill. (1) -----------Rim (-2)
−−−−−−−Knoll mounting hole (3) −−−−−−
--Drop part (//), --------- Drill on top (/2
)------Double drill (/j)---One unit
(/Leeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeing adjustment board (/j) (/9)-1~-----Cylinder (/4)--------Ikkoku
Fixture (/7) (/f)------Motor
CX)) ---- Patent applicant Daido Kogyo Co., Ltd.

Claims (1)

[Claims] Upper drill (//) and lower drill (/2) which are rotated by a motor (/7) (7g) and can also slide vertically.
) on the X-X line, and a stand (/3) on which the rim (1) on which the pulp attachment hole (2) is to be machined is placed between the upper drill (//) and the lower drill (/2). In order to determine the horizontal position of the rim (1), a fixing device (/B) operated by the cylinder (/S) and attached with an adjustment plate (/B) is then attached to the rim (1) from above. ?) Upper presser foot to press IIc (
20) A pulp drilling device is equipped with a device.