JPH0225687B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a drilling device for drilling a hole in a curved surface of a member to be drilled having a curved surface.

BACKGROUND ART Conventionally, in order to drill holes at multiple locations on a curved surface of a member to be drilled (hereinafter referred to as a workpiece) having a curved surface, a single cam for drilling holes is used, as shown in Fig. 4. 2, a plurality of punches 3, 3... are arranged and attached so that their tips approximate the curved surface 1a of the workpiece 1, and the cam 2 thus formed is pressed against the workpiece 1, and the punches 3, 3... I'm trying to drill holes. However, although the above method can be used as long as the curved surface portion 1a of the workpiece 1 is in a narrow range, if the curved surface portion 1a is in a wide range, the holes may be punched in one go due to various factors such as restrictions on the movement stroke of the cam 2 and the rigidity of the punch 3. In such cases, the drilling work is divided into two or several steps, for example, as shown in Figures 5 and 6.
As shown in the figure, in the first step, the curved surface 4a of the workpiece 4
The cam 5 and punch 6 are used to make a hole in about half 4a' of the curved surface 4a, and in the next step, the cam 7 and punch 8 are used to make a hole in the remaining half 4a'' of the curved surface 4a. Furthermore, if the curved surface of the workpiece is wide, the stroke is increased to perform drilling.

Problems to be Solved by the Invention When drilling with conventional drilling equipment, if the workpiece to be drilled has a wide curved surface, the drilling process is repeated several times, resulting in very poor workability. It was hot. Another problem was that a drilling device was required for each process, resulting in high equipment costs.

Means for Solving the Problems This invention has a plurality of passive cams for drilling provided with punches arranged radially around a certain center point, and the passive cams are operated radially by a cam driver. This is what I did.

Function: This invention uses a cam driver to move passive cams radially to force a punch into the entire curved surface of a workpiece, thereby punching a hole in one go.

Embodiment FIGS. 1 to 3 are drawings showing an embodiment of the drilling device according to the present invention. In the figures, 10 is a base attached to the lower mold (not shown) of the press machine, and the curved surface of the workpiece is For example, it is formed into a semicircular shape having a larger outer diameter than the curved surface of the workpiece, and has a semicylindrical step 11 protruding from the center thereof. A small-diameter back-up portion 12 rising upward is formed on the upper surface, and a vertical wall 13 is formed on the outer peripheral edge concentrically with the back-up portion 12, and a mounting flange is mounted at an appropriate location on the upper surface of the vertical wall 13. 14, 14... are integrally formed. Moreover, the center point 0 of the outer diameter surface of the base 10 is located on the flat sliding surface 10a at the intermediate portion of the base 10.
A large number of guide grooves 1 are arranged radially at equal intervals around the center.
5, 15... are formed, and elongated lower guides 16, 16 are attached to the guide grooves 15, 15, respectively.

17, 17... are the sliding surfaces 10a of the base 10
It is a passive cam that is placed on the top so that it can slide radially.It is a rectangular parallelepiped with a thin thickness, and the center half of both sides are tapered toward the center.
They are shaped so that they do not interfere with each other. Further, the passive cam 17 has a tapered guide surface 18 formed on its upper surface on the center side, and slide grooves 19 and 20 formed along the longitudinal direction on its upper and lower surfaces, respectively. The passive cam 17 has a lower slide groove 20 that is slidably fitted into the lower guide 16 attached to the base 10, and an upper slide groove 19 that is attached to the slide surface 10a of the base 10 via a support 21. The upper guide 23, which has a T-shaped cross section, is slidably fitted to the lower surface of the top plate 22, which is provided radially in correspondence with the passive cam 17. Therefore passive cam 1
7, 17, . . . are arranged radially around the center point 0 of the base 10.

Reference numerals 24, 24, . . . indicate hole punches attached to the outer diameter side end surfaces of the respective driven cams 17, 17, . . . via retainers 25, 25, .

26, 26... are edges that are attached to the vertical wall 13 of the base 10 and support the workpiece, and a fitting groove 27 is formed in a part of the lower surface, and the fitting groove 27 is connected to the vertical wall 13.
It is fitted into a mounting flange 14 formed in the flange 14 and fixed with bolts or the like. The edges 26, 26, . . . have appropriate lengths, and their center-side end surfaces 26a are formed in a shape similar to or similar to the curved surface of the workpiece.
And punches 24, 24 for each edge 26, 26...
Punch holes 28, 28, . . . for inserting punches 24, 24, .

30 is a cam driver attached to the upper die of the press machine, which forms a semi-cylindrical pressing part 31 that enters between the back-up part 12 of the base 10 and the passive cams 17, 17, and the lower part of the pressing part 31. A tapered pressing surface 32 corresponding to the tapered guide surface 18 of the driven cam 17 is formed on the outer diameter side, and a bulge 33 that slides into contact with the back-up portion 12 is formed on the lower inner diameter surface.

A return spring 34 is compressed and interposed between the vertical wall 13 of the base 10 and the passive cam 17. A part of the spring 34 is inserted into the vertical wall 13, and the passive cam 17
Always press toward the center. This return spring 34 is provided to face each driven cam 17 individually.

The above-described drilling device supports the workpiece 35 with its curved surface along the center side end surfaces of the edges 26, 26, . . . . After that, the upper die is lowered, the pressing part 31 of the cam driver 30 is inserted between the back-up part 12 of the base 10 and the passive cams 17, 17, and the bulging part 33 of the cam driver 30 is pushed into the back-up part of the base 10. 12, and press the tapered guide surfaces 18, 18... of the passive cams 17, 17 with the tapered pressing surface 32, so that each of the passive cams 17,
17... are moved radially around the center point 0 of the base 10, and holes are punched in the workpiece 35 using punches 24, 24... attached to the respective passive cams 17, 17.... When the hole drilling is completed, the upper mold is raised to raise the cam driver 30, and the pressing force of the cam driver 30 on the passive cams 17, 17... is released.
Passive cams 17, 17 with return spring 34
... to the center side and pull out the punches 24, 24... from the workpiece 33. After this, the workpiece 35 is taken out from the edges 26, 26, . . . and the work is completed.

Effects of the Invention In this invention, the passive cam provided with a punch for punching a hole in a workpiece is divided into a number of parts, and each passive cam is arranged radially to act. By arranging them all around the curved surface of the workpiece, it is possible to drill holes in the entire curved surface of the workpiece in one operation, greatly improving work efficiency and making the equipment more compact.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a drilling device according to the present invention;
Figure 2 is a plan view of the main parts showing the arrangement of the passive cam;
The figure is a sectional view taken along the line shown in FIG. 2, and FIGS. 4 to 6 are plan views of main parts for explaining conventional drilling. 10...Base, 12...Backup section, 1
3... Vertical wall, 16... Lower guide, 17... Passive cam, 18... Taper guide surface, 24... Punch, 26... Edge, 30... Cam driver,
32...Tapered pressing surface, 34...Return spring.

Claims (1)

[Claims] 1. A semicircular base having a semi-cylindrical back-up portion in the center for backing up the cam driver, and a vertical wall portion for attaching an edge concentrically formed on the outer periphery; A plurality of passive cams are provided to be slidable radially around the center point, a punch is attached to the outer end surface of each passive cam, and a punch is attached to the vertical wall of the base along the shape of the member to be drilled. A drilling device comprising: an edge forming a punch hole into which the punch is inserted; and a cam driver that enters between the passive cam and the backup portion of the base and slides the passive cam in a radial direction.