KR20020009267A - Device for and method of making blade holes on an rotor shaft using a milling machine - Google Patents

Abstract

PURPOSE: A device and method for making blade holes on rotor shaft using milling machine is provided which makes a plurality of blade holes on the rotor shaft without using of an exclusive equipment. CONSTITUTION: The apparatus for making blade holes on rotor shaft comprises a main plate(20) which is fixed to a bed(10) of a milling machine, in which bearings(26,28) are interposed, and which is equipped with mounts(23,25), wherein the rotor shaft(50) is rotationally supported to the mounts(23,25); a chuck fixing stand(38) which is installed on the main plate(20) so as to support one end of the rotor shaft(50) through a chuck(40); a tail stock(32) which is installed movably in a length direction on the main plate(20) so as to support the other end of the rotor shaft(50); an index(46) which is fixed to one end of the main plate(20) so as to control an angle of rotation of the rotor shaft(50); a first dividing plate(52) on the circumferential surface of which a plurality of dividing grooves are formed so that the rotor shaft(50) is rotated to certain degrees of an angle; a dividing plate fixture(60) and a second dividing plate fixture which temporarily releases the fixed state of the first dividing plate(52) during operation of the index(46) so as to enable rotation of the rotor shaft(50); and a second dividing plate which is arranged adjacently to the mounts(23,25) so as to check the dividing angles through a dial gauge(80).

Description

Rotor Shaft blade mounting groove processing device and processing method {DEVICE FOR AND METHOD OF MAKING BLADE HOLES ON AN ROTOR SHAFT USING A MILLING MACHINE}

The present invention relates to a blade mounting groove processing apparatus and a processing method of a rotor shaft capable of processing a blade mounting groove of a high speed rotor shaft for ships using a general general purpose milling machine.

The rotor shaft used for the engine of a large ship is a device that increases the efficiency of the engine by more than 20% by injecting outside air into the engine by a plurality of blades mounted on the outer circumference while rotating at a speed of 15,000 rpm or more. When manufacturing the rotor shaft, a dedicated equipment was used. The machine, called a broaching machine, is a broach-type cutter that strikes the rota shaft's machining part once to complete one blade groove. A plurality of turbine blades are fixed to the completed blade mounting groove.

However, the conventional rotor shaft processing equipment is difficult to manufacture and expensive, and thus cannot be introduced due to economic reasons, and even if introduced, there is a problem in that profitability is deteriorated due to a decrease in operation rate due to a small amount of material that can be secured.

The present invention for solving such problems is a blade mounting groove processing apparatus and processing method of the rotor shaft that can process a plurality of blade mounting grooves on the rotor shaft using a general universal milling machine without using a dedicated equipment for rotor shaft processing The purpose is to provide.

1 is a front view showing a state of use of the blade mounting groove processing apparatus of the rotor shaft according to the present invention,

2 is a plan view of the processing apparatus shown in FIG.

3 is a side view showing a state of use of the fastener for fixing the first partition plate,

4a to 4d is a cross-sectional view showing the processing sequence of the blade mounting groove according to the present invention,

Figure 5 is a cross-sectional view showing the inspection process of the completed blade mounting groove.

♣ Explanation of symbols for main part of drawing ♣

10: Bed 12: Tool stand

14: Spindle 16: cutter

18, 18 ': Block gauge 19, 19': Pin

20: main plate 22, 24: hydraulic clamp

26, 28: Bearing 32: Tailstock

38: Chuck fixation 40: Chuck

42: lock pin 44: lock clamp

46: Index 50: Rotor shaft

50a: fixed end 51: machining part

51d: blade mounting groove 52, 56: 1st, 2nd partition

52a: Split groove 58: Shaft holder

60: partition plate fastener 62: bracket

64: housing 65: pressure spring

66: knob 68: fixed shaft

80: dial gauge 82, 84: horizontal, vertical rod

Blade mounting groove processing apparatus of the rotor shaft of the present invention for achieving the above object is a main plate is provided with a support that is fixed to the bed of the milling machine and the rotor shaft is rotatably supported through a bearing, and through the chuck A chuck holder mounted on the main plate to support one end of the rotor shaft, a tailstock installed on the main plate so as to support the other end of the rotor shaft, and a tailstock fixed to one end of the main plate. An index for adjusting the rotation angle of the shaft, a first partition plate having a plurality of dividing grooves formed on a circumferential surface of the rotor shaft so that the rotor shaft can be rotated by a predetermined angle, and the first partition plate when the index is operated. Partition plate fasteners and dials that allow the rotor shaft to rotate by temporarily releasing the lock Through not to check the divided angle characterized by consisting of the second partition plate is disposed adjacent to the support.

In addition, the blade mounting groove processing method of the rotor shaft of the present invention by using the support on the main plate inclined at a predetermined angle to the bed of the milling machine to support the central portion of the rotor shaft rotatably, at the same time both ends of the rotor shaft Using a chuck and a tailstock to fix it so that it does not move, using a cutter to process holes and chambers in turn on the machining part of the rotor shaft, and then roughing and finishing, using at least one partition plate Releasing the fixed state of the rotor shaft and rotating the rotor shaft at a predetermined angle by using an index, and checking the dividing angle by using a partition plate and a dial gauge installed on the rotor shaft, and then rotating the rotor shaft. It characterized in that it comprises a step of fixing.

Hereinafter, with reference to the accompanying drawings will be described in detail the blade mounting groove processing apparatus and processing method of the rotor shaft according to a preferred embodiment of the present invention.

1 is a front view showing a state of use of the blade mounting groove processing apparatus of the rotor shaft according to the present invention, Figure 2 is a plan view of the processing apparatus shown in FIG.

As shown in these drawings, in the preferred embodiment of the present invention instead of the conventional dedicated equipment using a general general purpose milling machine blade mounting grooves (hereinafter, abbreviated as mounting grooves) of the rotor shaft is a method that can be machined To illustrate. In view of the rough construction of the processing apparatus, the main plate 20 fixed to the bed 10 of the milling machine, and the support for disposing on the main plate 20 to support the central portion of the rotor shaft 50 are shown. (23) and (25), the chuck 40 and tailstock 32 for supporting both ends of the rotor shaft 50, the index 46 for rotating the rotor shaft 50 at a predetermined angle, and For fixing and releasing the first partition plate 52, the second partition plate 56 for checking the rotation state of the rotor shaft 50 through the dial gauge 80, and the first partition plate 52. It consists of a divider fixture 60.

Here, the main plate 20 is fixed on the bed 10 of the milling machine by the clamp 44 or the plurality of fixing pins 42. In this case, the center line of the main plate 20 is inclined at an angle of 17 ° with the longitudinal center line of the bed 10. The reason for this is that, according to international regulations, the mounting groove 51d to be machined to the machining part 51 of the rotor shaft 50 should be formed to be inclined at an angle of 17 ° from the axis center of the rotor shaft.

On the main plate 20, support members 23 and 25 for rotatably supporting the rotor shaft 50 are provided, for example, via bearing means such as brass metal bearings 26 and 28. In addition, the support shafts 23 and 25 are provided with hydraulic clamps 22 and 24 for fixing the rotor shaft 50 to move the rotor shaft 50 by the hydraulic pressure supplied through the hydraulic hose. Secure it so that

One end of the rotor shaft 50 is supported by the chuck 40 provided on the chuck holder 38 and the other end is supported by the usual tailstock 32 used in machine tools such as lathes. Therefore, at the time of fixing the rotor shaft 50, the mandrel 34 having one end supported on the chuck 40 and the other end inserted into the tailstock 32 in the state in which the center portion is fitted to the supports 23 and 25 is inserted. The handle 36 may be fixed so as not to move in the state of being supported. Tailstock 32 is installed so that the longitudinal movement on the main plate 20, so that it can be fixed even if the length of the rotor shaft is different depending on the vessel.

As shown in the figure, the left side of the main plate 20 is for adjusting the rotation angle of the rotor shaft 50 when machining the next mounting groove adjacent to the completion of the mounting groove 51d formed in the machining part 51. The index 46 is provided. In processing the mounting groove 51d, the index 46 is adjusted to coincide with the first partition plate 52. In other words, by using the index 46, it is possible to move the machining part 51 within a predetermined angle, for example, within a tolerance range of 8 ° ± 1 '.

The first partition plate 52 is disposed on the main plate 20 adjacent to the index 46, and the first partition plate 52 is stopped from rotation by the fixed shaft 68 of the partition plate fixture 60. . The dividing plate fastener 60 has a fixed shaft 68 inserted into the dividing groove 52a of the first dividing plate 52 during processing to restrain the radial rotation of the rotor shaft 50, while the index 46 At the time of operation), the fixed state of the first partition plate 52 is temporarily released to enable the rotation of the rotor shaft 50.

Apart from the first partition plate 52, a second partition plate 56 is further disposed. The second partition plate 56 serves to check the division angle through the dial gauge 80. The ordinary dial gauge 80 may be attached to the tool post 12 of the milling machine by the horizontal rod 82 and the vertical rod 84. The cutter 16 is attached to the spindle 14 of the tool post 12.

Next, FIG. 3 is used to mount the blade mounting groove of FIG. 4A together with the index 46, and a side view of the holder for holding the first partition plate is shown. Looking at the configuration of the partition plate fixture 60, the housing 64 is fixed to the bracket 62 disposed on the main plate 20, and one end is the first split plate 52 by the pressure spring (65). Is inserted into the dividing groove (52a) and the other end is composed of a fixed shaft (68) having a knob (66).

The partition plate fastener 60 and the index 46 of this structure are used for the processing of the blade mounting groove, and in the processing of the blade groove, the lower end of the fixed shaft 68 is the division groove of the first partition plate 52. It is inserted in the 52a to restrain the radial rotation of the rotor shaft 50. Next, when machining the next adjacent mounting groove, lift the rib 66 fixed on the upper end of the fixed shaft 68, the fixed shaft 68 overcomes the force of the spring 65 and upwards in the housing 64. It will be moved to, and the lower end of the split out from the groove 52a. As a result, the fixed state of the first partition plate 52 is released, and it is possible to rotate the rotor shaft 50 at a predetermined angle.

In this way, in the state in which the fixed state of the rotor shaft 50 is released, the machining part 51 is rotated within the tolerance range of 8 ° ± 1 'using the index 46. Next, after checking the dividing angle by using the second dividing plate 56 and the dial gauge 80 provided on the rotor shaft 50, the fixed shaft 68 of the dividing plate fixture 60 is adjacent to the dividing groove. The next blade mounting groove is machined in the state where the radial rotation of the rotor shaft is restrained by inserting in the 52a to fix the first partition plate 52.

4A to 4D are cross-sectional views illustrating a processing sequence of the blade mounting groove according to the present invention, with reference to this, a process of processing the blade mounting groove will be described.

First, while supporting the central portion of the rotor shaft rotatably by using the support 23, 25 on the separate main plate 20, both ends of the rotor shaft are chuck 40 and tailstock 32 ) So that it does not move. At this time, the first split plate 52 is maintained in a fixed state by the fixing shaft 68 of the split plate fixture 60 inserted into the split groove 52a.

In this state, the hole 51a is primarily formed in the machining part 51 by using the hole cutter 16a shown in FIG. 4A operated by one milling machine.

Next, using a chamber cutter 16b operated by another milling machine, the hole 51a formed in the machining part 51 is processed into a cone-shaped chamber 51b, and then the roughing cutter 16c is The blade mounting groove 51c is roughly machined into the machining part 51 by using the same. Normally, a roughing allowance of about 0.2 to 0.3 mm is given during roughing for the next finishing operation.

Next, by precisely machining the press groove 51c using the finishing cutter 16d, the blade mounting groove 51d as shown in FIG. 4D is completed. After the completion of one mounting groove 51d through a series of holes, chambers, roughing, and finishing operations, the rotor shaft 50 is rotated to process the next adjacent mounting groove.

That is, as described with reference to FIG. 3, the machining part 51 is set to 8 ° ± 1 'using the index 46 in the state in which the rotor shaft 50 is released by operating the plate holder 60. Rotate within the tolerance range of.

As described above, after the machining part 51 is rotated by using the index 46, the dividing angle is checked by using the second dividing plate 56 and the dial gauge 80 installed on the rotor shaft 50. Next, as described with reference to FIG. 3, the first split plate 52 is fixed by using the fixed shaft 68 of the splitter fixture 60 in the above order in the state in which the radial rotation of the rotor shaft is restrained. The blade mounting groove 51d is machined.

Next, Figure 5 is a cross-sectional view showing the inspection process of the completed blade mounting groove. After the machining of all the mounting grooves 51d on the circumferential surface of the machining part 51 on the principle as described above, the rotor shaft is separated in the reverse order at the time of installation and transported to the inspection station.

For inspection of the completed mounting groove 51d, insert the pin 19 into the lower left and right recesses and insert the block gauge 18 to check the tolerance visually, and then pin the upper right and left recesses. Insert (19 ') and insert a block gauge (18') to visually check for tolerances. In this way, the tolerance of all the mounting grooves 51d formed on the circumferential surface of the machining part 51 is checked to finally determine whether the product is passed.

According to the present invention described above, by processing a plurality of blade mounting grooves in the rotor shaft using a conventional milling machine without using a dedicated machine for rotor shaft processing, it is not necessary to purchase a dedicated and expensive dedicated equipment of the conventional Productivity and profitability are improved, there is an advantage that can significantly reduce the manufacturing cost.

Claims (3)

A main plate 20 fixed to the bed 10 of the milling machine and provided with supports 23 and 25 on which the rotor shaft 50 is rotatably supported via bearings 26 and 28; A chuck holder 38 mounted on the main plate 20 to support one end of the rotor shaft 50 through the chuck 40; A tailstock 32 installed on the main plate 20 to be movable in the longitudinal direction so as to support the other end of the rotor shaft 50; An index 46 fixed to one end of the main plate 20 to adjust a rotation angle of the rotor shaft 50; A first dividing plate 52 having a plurality of dividing grooves formed on a circumference thereof so that the rotor shaft 50 can be rotated by a predetermined angle; The partition plate holder 60 and the second plate holder 70 which temporarily release the fixed state of the first partition plate 52 to allow the rotation of the rotor shaft 50 when the index 46 is operated. Wow, Blade mounting groove processing apparatus of the rotor shaft, characterized in that composed of a second partition plate 56 disposed adjacent to the support 23, 25 to check the divided angle through the dial gauge (80) . The method of claim 1, The partition plate fixture 60 is divided into the housing 64 fixed to the bracket 62 disposed on the main plate 20 and one end of the first partition plate 52 by a pressure spring 65. The blade mounting groove processing apparatus of the rotor shaft, which is inserted into the groove (52a) and the other end is composed of a fixed shaft (68) having a knob (66). While supporting the central portion of the rotor shaft rotatably using the supports 23 and 25 on the main plate 20 fixed to the bed 10 of the milling machine at a predetermined angle, both ends of the rotor shaft are rotatable. Fixing the chuck 40 and the tailstock 32 to prevent movement by Using a cutter to process the hole 51a and the chamber 51b in the machining part 51 of the rotor shaft 50 in order, and then rough and finish machining; Releasing the fixing state of the rotor shaft by using the first dividing plate 52 and rotating the rotor shaft 50 at a predetermined angle by using the index 46; Checking the divided angle by using the second partition plate 56 and the dial gauge 80 installed on the rotor shaft 50, and then fixing the rotor shaft blade mounting groove of the rotor shaft, characterized in that Processing method.