JPH0310706A - Method and apparatus for boring mounting hole - Google Patents

Abstract

PURPOSE:To automate the boring of a mounting hole in a flange surface by lifting and inserting an inspection pin into the bored holes, for confirmation and stamping a proof mark after and clamping the left and right portions of a casting symmetrically and forcing the flange to coincide with the upper drill position so as to make boring process with a plurality of drills. CONSTITUTION:A half-divided cylindrical casting C provided with flanges on its divided surfaces is temporarily placed on a square table 2 slidable on a base bed 1 and fixedly engaged with a set of two left and right symmetric clamp levers 5A, 5B and 6A, 6B rotated by rotating handles 3, 4 and brought in contact with the inner surface of the casting C so that the bore of the casting coincides with the axis of the cylinder. The square table 2 slided by a cylinder 7 is restricted, by restraining plate 10 such that a boring position is brought under a drill guide bushing 13, and after the boring process, released from the restraint of the restraining plate 10 to be returned to its initial position. Next, an inspection pin 17 is lifted from below to confirm the boring of a mounting hole 14 of the worked casting C and a marking machine 17 is operated to stamp an acceptance mark.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of drilling a mounting hole and an apparatus therefor, particularly a technique for drilling a mounting hole on a flange surface of a cast product having a two-part cylindrical shape and a flange attached to the split surface. It is.

[Prior Art] An example of a cast product having a two-part cylindrical shape and a flange attached to the split surface is shown in FIG.

The upper half should more accurately be called a T-shape, but when installing a new branch pipe in a T-shape to an existing gas pipeline, it is fitted over the outside of the pipe from above and below to support the branch airtight. It plays the role of maintaining airtightness. Since the upper and lower flange surfaces are screwed together with several bolts and nuts, it may not be possible to screw them together unless the mounting holes are drilled in the correct positions, or the upper and lower end surfaces may be misaligned, resulting in an unsightly connection.

Cast products that have a small wall thickness but a long shape are distorted and twisted, making it difficult to obtain products with exactly the same dimensions. Even if the same model is cast, dimensional variations are unavoidable. When drilling mounting holes, it is necessary to center each hole individually and use a multi-axis or single-axis drill. However, in order to confirm whether the desired processing has been carried out, the position of each mounting hole must be inspected visually or with a special gauge, and only after the inspection is completed will the inspector manually stamp a stamp. This process is then repeated.

[Problem to be solved by the invention] The casting process itself has been considerably streamlined, efficiency and automation have progressed by using various molding number ranges and newly developed molding materials, and a mass production system for standardized products has already been established. are doing.

However, no matter how thorough the quality control is, it is still difficult to guarantee complete identity for the above-mentioned cast products, and variations due to slight differences in delicate external conditions are still usually not overcome. be. This has become a bottleneck in automating the drilling of attachment holes, and has come to be particularly sought after as an obstacle in the process rather than in the casting itself.

In order to solve the above-mentioned problems, the present invention aims to provide a method and an apparatus for automating the process of drilling the mounting holes of the cast product, which has already been identified.

[Means for Solving the Problems] The method of drilling a plurality of mounting holes in the flange surface of the casting product according to the present invention includes dividing the casting product symmetrically with respect to the axis, gripping the same, and drilling holes. Guide and suppress the position on the flange to match the position of the upper cone, and multiple cones descend from above to drill multiple attachment holes and protrude upward into the attachment holes at a predetermined pitch. The above-mentioned problem was solved by automatically proceeding with the procedure of vertically inserting a plurality of inspection pins to confirm the inspection and stamping a confirmation stamp at a predetermined position after confirmation.

In addition, as a device used only for carrying out this method, two sets of two gripping levers, each of which rotates evenly left and right by the rotation of a screw, are arranged in parallel in the axial direction on a square tabletop that can freely slide on the base. On one side of the base, multiple cones are installed that can be raised and lowered from above.
Further, a restraining plate with a plurality of guide holes on the same axis as the drill is placed below this so that it can be raised and lowered, while on the other side of the base, inspection bottles with the same pitch as the predetermined mounting holes are protruded downward and can be raised and lowered. A stamping machine for stamping a verification mark is provided above the stamping machine, and all the members are controlled to operate automatically in sequence.

[Operation/Example] FIGS. 1 to 4 are a plan view, a front view, a side view, and a perspective view, respectively, showing an example of the present invention.

In the figure, two sets of gripping levers 5A, 5B and 6A, 6B, which rotate evenly left and right by the rotation of the handle 3.4, are arranged in parallel in the axial direction on the own vehicle 2, which is slidable on the base 1. Install it. Therefore, a cast product C having a two-part cylindrical shape and a flange attached to the split surface as shown in FIG. 3 is temporarily placed, and the handle 3
, 4 manually, the four gripping levers rotate and come into contact with the inner surface of the casting C, pressing it even harder. Even if there is some variation (error), the inner diameter is distributed evenly from the axial center, the position is corrected so that it coincides with the axial center of the cylinder, and the cylinder is firmly gripped at this position to lock it so that it does not move. In this state, the vehicle 2 slides laterally (to the right in the figure) on the base 1. Specifically, due to the action of the drive cylinder 7, it skids on the rail 8 and is stopped by the limiter 9.

Here, the restraining plate 10 descends from above and guides the user to an accurate position in the lateral direction (right and left directions). Specifically, the bottom of the restraining plate is provided with unevenness that fits with the unevenness provided on the flange surface of the cast product C, and even if there is some misalignment, this fitting forces the cone directly below the cone 11. Correct the drilling position so that it is located at the hole and hold it down. The restraint plate 10 is moved up and down by the operation of the cylinder 12. This restraining plate 10 has a guide bush 13 opened at the position where the awl should be inserted, and a guide hole (
play the role of Yatoi). The awl 11 is attached to this guide bush 1
Attachment holes are drilled at correct positions on the flange surface guided by 3 and suppressed by the restraining plate 10.

When the drilling is completed, the restraining plate 10 releases its restraint and rises,
The vehicle 2 slides back to its original position (to the left in the figure) and is stopped at a predetermined position by the limiter 14. The inspection pin 16 planted in the inspection device 15 rises from below to check whether the specified mounting hole is drilled, and if it passes, the inspection stamp machine 1 is inserted from the side.
7 comes into operation and stamps an acceptance mark at a predetermined position on the cast product C.

Although not shown in the figure, a sequence is set up and controlled by an electric circuit so that these operations occur at a predetermined timing according to a predetermined procedure.

[Effects of the Invention] Since the drilling method and device according to the present invention have the above-mentioned configuration and operation, it has succeeded in automating the drilling and inspection of mounting holes in castings with relatively uneven dimensions, and has enabled mass production of castings. The problem was solved by completely removing the obstacles in the system.

[Brief explanation of drawings]

1 to 4 are plan views of the embodiments of the present application, respectively;
Front view, side view and perspective view, FIG. 5A. The opening is a plan view and a side cross-sectional view of a cast product that is the subject of the present application. 1... Foundation 2... Own vehicle 3.
4... Handle 5, 6... Gripping lever 10... Suppression plate 11...
Awl 13...Guide bush (guide hole) 15...
...Inspection device 16...Inspection bin 17
・・・・・・Seal stamp machine

Claims (2)

[Claims] (1) In a method of drilling a plurality of mounting holes in the flange surface of a cast product having a two-part cylindrical shape and a flange attached to the split surface, the cast product is distributed symmetrically with respect to the axis and gripped, The position on the flange to be drilled is guided and restrained so that it matches the position of the upper cone, and multiple awls descend from above to drill multiple attachment holes and move upward into the attachment holes at a predetermined pitch. Verify by inserting multiple protruding test pins upward.
A method for drilling a mounting hole, characterized by automatically proceeding with the procedure of stamping a verification stamp at a predetermined position after confirmation. (2) On a square tabletop that can slide freely on the base, two sets of two gripping levers, which rotate evenly left and right by the rotation of screws, are arranged in parallel in the axial direction, and on one side of the base, multiple awls are placed upward A restraining plate with a plurality of guide holes on the same axis as the cone is placed below the plate so that it can be raised and lowered, while the other side of the base is equipped with inspection pins with the same pitch as the predetermined mounting holes. It is divided into a two-part cylindrical shape, characterized in that it is protruded so that it can be raised and lowered freely, a stamping machine for stamping a verification mark is provided above it, and that all the members are controlled so that they automatically operate in sequence. A device that drills multiple mounting holes into the flange surface of a cast product that has a flange attached to the surface.