JPS60150917A - Preparation of pins - Google Patents

Abstract

PURPOSE:To reduce the processes for the preparation of pins into half by using wire-cut electrical discharge machining by a large margin. CONSTITUTION:A groove 13 is formed onto the upper surface of an SUS-304 material 11 by a side cutter 12. The material 14 having the groove 13 worked is set onto a wire-cut electrical discharge machine 15, and a square pillar member 16 is worked. Then, Stellite rod 18 is Stellite build-up-welded into the groove 13 on the square pillar member 16 by using an acetylene burner 19, and then annealed for removing stress in an electrical furnace, etc. Then, the square pillar member is cut into a prescribed length by a wire-cut electrical discharge machine 15 again, and a build-up square pillar member 20 is formed. Finally, the member is cut in one time to a pin having a prescribed section by the working machine 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the manufacturing method of a bottle whose one side has been subjected to a process such as stellite overlay, and is particularly suitable for manufacturing a stub damper bottle for a turbine.

One type of bin that is used with processing applied to one side is the stub damper bin, which is attached to the low-pressure final stage of the rotor of a land turbine. It is then finished with stellite overlay and manufactured according to the process shown in Figure 1.

As a material, prepare a stainless steel plate (SUS304) 1 of 12 x 500 x 700 (thickness x width x length, same hereinafter), and use this material 1't side cutter 2 to cut approximately 12 x 25 x
After cutting to 350mm, milling 6 sides to 12x
The square timber 3 is 25x350.

Next, a groove 4 with an inverted trapezoidal cross section is cut on the top surface of this square piece 3 using a groove cutter attached to a milling machine, and then a stellite rod 5 is melted and bonded to the groove 4 using an acetin gas burner 6 or the like to build up stellite overlay. Perform welding and perform strain relief annealing.

After annealing, the square material 3 is cut to a length of 8011II+ with the side cutter 2 to obtain a 12X25X80 square material, and the stellite surface is processed to a minimum of 7.6Xi6X8.
The material is finished with overlay material 7 of 0.

- Separately from this overlay material 7, a liner 8 having a thickness of approximately 1.6 mm is prepared by polishing.

Then, align the stellite surfaces of the two overlay processed materials 7,
In between, the liner 8 is sandwiched and both end faces are spot welded so that they do not separate. After this, use a milling machine to reduce the width across flats to 1
It is machined into an octagonal column shape with 6 squares, and then turned into a round bar 9 of 13φ x 80+m by lathe processing.

Finally, one end of the liner 8 in the width direction is shaved off to form a chamfer 11, the spot welds are removed, and two stub damper pins io'14 are installed.

In this way, the production of stub damper binue 0 is completed.
The total process is 12 steps, and in particular, processing is completed from plate material to square material, octagonal material, and round bar, and groove processing for overlay processing is performed after cutting into square materials and attaching them to the machine table one by one. The disadvantage is that it is complicated and takes a long time.

1. In order to cut the stainless steel plate material into square pieces, a side cutter is coated with gold, and if the cutter breaks, it can cause scratches, resulting in quality deterioration and safety issues. Furthermore, the side cutter requires a certain degree of rigidity and a certain thickness, and a cutting allowance corresponding to this thickness is required, which increases the material cost.

It is an object of the present invention to provide a method for manufacturing pins that can eliminate such conventional drawbacks, reduce the number of manufacturing steps by half, improve quality and safety, and reduce costs. The structure of the present invention that achieves this object is as follows: - When manufacturing all the pins whose side surfaces have been processed, rough processing corresponding to the processing of the side surfaces is performed on the surface of the plate-shaped material at a constant pitch. Thereafter, the material is cut into prismatic shapes by wire-cut electric discharge machining, the side surfaces of each are finished, and then these prismatic materials are arranged in a plate shape and each is cut into a predetermined cross-sectional shape by wire-cut electric discharge machining. Features.

Hereinafter, an embodiment of the pin manufacturing method of the present invention applied to the manufacturing of a stub damper bin will be described in detail with reference to FIG. 2, in which the process is omitted.

As the material 11, a stainless steel plate (5US304) of 12 x 500 x 700 (thickness x width x length, same hereinafter) is prepared.

Then, the side cutter 12 is used to cut grooves 13'ff for stellite build-up on the upper surface of this material 11 at a predetermined 25 pitch.

Next, the grooved material 14 with the grooves 13 processed therein is attached to a wire-cut electrical discharge machine 15 and cut into a 12×25×350 square column shape to obtain a square column material 16. In this case, for example,
The cutting is carried out using a wire 17' made of brass and having a diameter of 0.2 mm, and the cutting distance is kept as small as possible, about 0.3 m.

Thereafter, stellite rods 18 are welded to the grooves 13 of each of the square columns 16 using an acetylene gas burner 19, a TIG welding machine, etc., and after welding, strain relief annealing is performed using an electric furnace or the like.

Then, in order to make each stellite overlaid prismatic material to a predetermined length, the wire-cut electric discharge machine 15 is used again for 12 seconds.
It is cut to x2sx80 to obtain a built-up prismatic material 20.

Finally, in order to make the cross-sectional shape of the built-up prismatic pillar materials 20 into a predetermined approximately semicircular shape, the stellite build-up surface of these built-up prismatic pillar materials 20 is unidirectional, and moreover, the longitudinal direction is the wire-cut electric discharge machine 15. The wires are arranged and set in a plate shape so as to match the direction of the wire 17, and continuous machining is performed while cutting them into a predetermined cross section in one go with the wire cut electrical discharge machine 15.

By manufacturing the stub damper pin,
The conventional 12 steps can be halved to 6 steps, significantly shortening the number of steps and construction period.

In addition, since the plate material is cut using wire-cut electrical discharge machining, the cutting width is extremely small, and there is almost no processing distortion, so grooves can be machined as is in the plate material, making the work easier and reducing material costs. This will reduce costs. Well done.

Good quality products can be obtained without the need for distortion correction. Furthermore, by controlling the wire-cut electric discharge machine using NC and arranging the prismatic materials after overlay welding during cutting into a plate shape, continuous unmanned operation is possible, which significantly reduces the number of man-hours.

In addition, the liner that was conventionally required for processing becomes unnecessary, making production easier, and even highly hard prismatic material after Stellite overlay can be easily cut, reducing processing time.

Similarly, although the above embodiment describes the production of a stub damper pin, the present invention is not limited to this and can be widely applied to the production of pins that require processing on the negative side.

As described above in detail with the embodiments, according to the present invention, by significantly incorporating wire-cut electric discharge machining, the entire process can be halved, and it is also possible to achieve superior quality and safety as well as cost reduction.

[Brief explanation of drawings]

FIG. 1 is a process diagram for manufacturing a conventional stub damper pin, and FIG. 2 is a process diagram when an embodiment of the bottle manufacturing method of the present invention is applied to a stub damper pin. In the drawings, 11 is a material, 12 is a side cutter, 13 is a groove, 14 is a grooved material, and 15 is a wire-cut electrical discharge machine. 16 is a prismatic material, 17 is a wire, 18 is a stellite rod, 19 is a gas burner, and 20 is a built-up prismatic material. Patent applicant Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney Shibu Mitsuishi (and 1 other person) 2nd run 11 2 5 b

Claims (1)

[Claims] When manufacturing a bottle with one side processed, the surface of a plate-shaped material is rough-processed at a constant pitch corresponding to the side-side processing, and then cut into a prismatic shape by wire-cut electrical discharge machining. A method for manufacturing a bottle, which comprises: finishing the entire side surface of each of the prismatic materials, and then arranging these prismatic materials in a plate shape and cutting each of them into a predetermined cross-sectional shape by wire-cut electrical discharge machining.