JPS5969264A - Nozzle branch device for sand blast - Google Patents

Abstract

PURPOSE:To uniformly machine a work by constituting a nozzle branch device for machining the injection hole of a turbine disk for a jet engine so that the sand air can be sprayed to multiple nozzles in the same sand blast condition. CONSTITUTION:A nozzle branch holder 5 is provided with multiple branch injection ports 55 below a closed case 50 connecting an injection main pipe 56. The bottom interior of a bottom body 51 is formed in a spherical shape, and branch injection ports 55 of the same number as the nozzle ports on a patch plate 7 are formed at a uniform distance on the peripheral wall at the same height from the center of the bottom interior. Burnishing grains of alumina oxide are sealed in advance in a case 50 to a position slightly lower than the branch injection ports 55. The sand air injected from the injection main pipe 50 hits the surface center of the burnishing grain layer stored in the bottom of the case 50, and makes the sand face of the bottom center recessed and makes the periphery of the sand face uniformly swelled. The swelled burnishing grains overflow to individual branch injection ports 55, and are blasted to the injection hole 81 of a turbine blasted to the injection hole 81 of a turbine disk 8 from nozzle ports through hoses 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle branching device in which sand air from a sand air injection main pipe is branched into a plurality of nozzles in a sandblasting device and can be injected from each nozzle at the same injection pressure.

In conventional sandblasting equipment, the sand air supplied from the sand tank to the main injection pipe is branched to multiple nozzles and ejected, allowing simultaneous blasting work at multiple locations using one sand tank and main injection pipe. Or it may be done individually.

At this time, sand air is required to be ejected at the same pressure and flow rate to all nozzles so that each nozzle can perform blasting under the same conditions.

As shown in FIG. 6, the conventional nozzle branching device connects a sand air injection main pipe to one end of a long header (50), and has a plurality of branching outlets 65 arranged in a row on the shaft of the header (50). A branch hose (6) is connected to each branch spout (55),
Blasting work is carried out by attaching a spray nozzle to the tip of each branch hose (6). However, in the conventional nozzle branching device, the air pressure, mixing ratio of abrasive particles, and flow rate are different between the branch outlet (55a) close to the main injection pipe (5G) and the branch outlet (55b) far away, and each branch Hose (6)
It was not possible to maintain uniform blasting conditions at the injection nozzle.

Figure 6 shows the process of finishing the injection holes on the outer circumference of a turbine disk of a jet engine supercharger by sandblasting. cast and molded,
After casting, a drill is passed through the injection hole to finish the hole surface.

However, since the turbine disk is made of an ultra-hard titanium alloy, it is hard and has extremely poor workability. For this reason, the drill becomes worn out and becomes unusable after completing just two or three injection holes, and the drill must be replaced repeatedly to finish all the injection holes, which is time-consuming and reduces efficiency. Unfortunately, there was also the problem of increased processing costs.

Therefore, the applicant attempted to finish the injection holes of the turbine disk for a supercharger by sandblasting.

FIG. 6 shows the sandblasting device used as a prototype.

, L The blasting device is configured to inject jets of the turbine disk (8) into a circular arc pad (7) that matches the outer circumferential curvature of the disk.
A plurality of nozzle ports ff1) are opened corresponding to the pitch of holes +81) to (81), and each nozzle port (71) to (711) is opened.
Branch hoses (6) to (6) branched from the sand air injection main pipe through the header are connected to the sand air injection main pipe.

According to the above-mentioned blasting device, by aligning the injection holes (+81) of the turbine disk (8) and the nozzle opening (71) of the pad (7) and injecting sand air for 2 to 3 minutes, the injection holes of the disk (8) are There is an advantage that (81) can be completed efficiently by using a plurality of them.

However, in this device, as mentioned above, the ejecting air pressure, the mixing ratio of abrasive particles, and the ejecting flow rate are different between the branch nozzle close to the main injection pipe and the branch nozzle far from the main injection pipe.
It was found that the finish of each injection hole (81) of No. 8) was uneven.

The technical problem to be solved by the present invention is to eject sand air of the same pressure from each branch injection port, and to achieve blasting under the same sandblasting conditions for each nozzle.

The technical measures taken to solve the technical problem described in item 1 are to connect the sand air injection main pipe to the center of the upper surface of the sealed case toward the bottom of the case, and connect the bottom peripheral wall of the case to the bottom surface of the case at the same height. It is equipped with multiple branch injection ports.

If abrasive particles are sealed in the bottom of the case in advance and sand air is injected from the main injection pipe toward the bottom of the case,
Sand air collides with the sand surface accumulated at the bottom of the case, denting the sand surface at the center of the bottom and evenly raising the outer periphery of the sand surface. The abrasive particles on the raised outer periphery overflow to each branch injection port and are ejected from the nozzles.

Therefore, by connecting ports of the same length to each branch injection port, sand air is injected from the nozzle ports connected to each port under the same sandblasting conditions. By connecting this hose to each nozzle port of the pad, a plurality of locations of each injection hole of the turbocharger turbine disk can be blasted uniformly and efficiently.

The present invention will be specifically described below based on embodiments shown in the drawings.

FIG. 1 shows a state in which a nozzle branch boulder (5) according to the present invention is installed in a known box-type sandblasting device.

In the sandblasting device, a workpiece, for example, a turbine disk for a supercharger (
a turntable (3) supporting a turntable (3), a stopper (7) provided with a plurality of nozzle ports (71) and arranged so as to be able to approach and separate from the outer periphery of the turbine disk (8), and a box (1).
A nozzle branch holder (5) that branches and communicates the sand air injection main pipe (56) deployed through the nozzle port (711) of the pad (7), and a recovery hose t21 at the lower end of the box fil. It consists of a connected abrasive particle collection device (2).

The outer circumferential surface of the turbine disk (8) has a large number of injection holes (811) with a diameter of 3 mm arranged at equal intervals in a radial manner. It is curved, and a plurality of nozzle ports ffl+ are opened at equal intervals facing the injection hole (8υ) of the turbine disk (8), and a wear-resistant reinforcing tube (72) made of tungsten is fitted to the nozzle lower 1+. There is.

A concave groove ('73) is formed in the inner peripheral surface of the pad (7) in the longitudinal direction, and a urethane rubber pad ('7) is attached to the layer (73).
41, and each nozzle port σl is inserted into the corresponding plate ff41.
) is provided with a through hole ('75) that communicates with it.

Pin holes (761) for positioning are provided at both ends of the pad (7).

The base end of the lever (7) is pivoted to the tip of the lever surface provided in the box (1) so that it can rotate in a horizontal plane.
) is attached to a shaft qα that is rotatably supported.

On the transition path of the lever surface, there is a cam (4) that can come into contact with the lever (m).
A clamp device (4) with a handle (4) protruding from the handle (1) is provided.

The nozzle branch holder (5) is provided with a plurality of branch injection ports (5!) at the bottom of the sealed case that connects the main injection pipe.

The case ■ is formed into a vertically long rotationally symmetrical shape by removably fixing a lid 621 to a thick bottom body (51) via a sealing material (53). The injection main pipe (561) protrudes toward the bottom of the case.

The bottom inner surface of the bottom body 1511 is formed into a spherical shape, and the bottom body (51
) are provided with the same number of branch injection ports (55
) are formed at equal intervals.

The abrasive particles (9) are previously sealed in the case spit to a position slightly lower than the branch injection port.

The abrasive particles of the embodiment are particles of alumina oxide.A flexible hose of the same length is connected between each branch injection port (55) and the base end of each nozzle port (71) of the cover (7). (6) - (6) communicate with each other.

However, the turntable (3)" and the turbine disk (
8) is fixed and the lever surface is rotated to bring the stopper (7) into contact with the outer periphery of the turbine disk (8). The stopper (7) is rotatably fixed to the tip of the lever, so even if the turntable (3) and turbine disk (8) are slightly misaligned, the inner surface of the stopper (7) will The attached urethane rubber abutment plate q4) is attached to the turbine disc (8) without any gaps.
touches the outer periphery of

Rotate the turntable (3) to rotate the turbine disc (8).
) injection port (81) and nozzle port (7) ff1)
and insert the positioning pin (43) through the pin holes (76) at both ends of the stopper (7) and the injection c+ (811) of the turbine disk (8).

In the above state, the handle (42) of the clamping device (4)
Rotate to press the crest of the cam (41) against the lever surface,
The stopper (7) is pressed against the outer peripheral surface of the turbine disk (8) and clamped.

Next, sand air containing a mixture of abrasive particles and compressed air is injected into the nozzle branch holder (5) from the sand air injection main pipe (56).

The abrasive granules are the same alumina oxide as the abrasive granules enclosed in the case of the branch holder (5).

The sand air injected from the main injection pipe (56) collides with the center of the surface of the abrasive grain layer collected at the bottom of the case, causing the surface to become concave.

The abrasive grains contained in the sand air collide with the abrasive grain layer accumulated at the bottom of the case ω) and mix with the abrasive grains in the layer.

On the other hand, the outer peripheral side of the abrasive grain layer rises evenly in accordance with the depression in the center, and the abrasive grains that have reached a higher level than each branch jet port ω) overflow from the branch jet port ω). It blows out on the pressurized air that fills the case, and flows through the nozzle port (71) of the cover (7) through the hose [6] to the turbine disk (
Each branch injection port 65) that sprays the injection holes (81) to (81) of 8) opens at the same height from the bottom of the case (50), and the pressurized air in the case is sprayed under the same conditions to each branch injection port. Since it is injected from the turbine disk (8), the plurality of injection holes (81) of the turbine disk (8) can be cleaned all at once and evenly.

At the bottom of the case (A), the amount of abrasive grains (9) that is approximately equal to the amount initially sealed remains at all times, and the sand air does not directly collide with the bottom of the case. will not be worn out or torn by the sand air.

In the case of the example, the hole surface could be beautifully finished with a cleaning time of about 45 seconds.

The present invention has the excellent effect of being able to eject sand air while keeping a plurality of nozzles under the same sandblasting conditions, and being able to uniformly blast a plurality of locations on a workpiece at once.

[Brief explanation of the drawing]

Figure 1 is a front view of the blasting device, Figure 2 is a sectional view of the nozzle branch holder, Figure 3 is a sectional view taken along line JII-III in Figure 2, Figure 4 is a sectional view of the pad, and Figure 5. 6 is a perspective view showing the connection state between the nozzle branch holder and the stopper.
The figure is a perspective view showing a connection between the nozzle branch holder and the stopper, which the applicant attempted before filing the present application. (5)...Nozzle branch holder (50)...Case Zheng)...Injection main pipe 6
5)...Branch injection port

Claims (1)

[Claims] ■ A sand air injection main pipe (56) is connected to the center of the upper surface of the sealed case (50) toward the bottom of the case, and a plurality of branch injection ports 65 are provided on the lower peripheral wall of the case (50). ) are arranged in the circumferential direction. (2) The sandblasting nozzle branching device according to claim 1, wherein the bottom inner surface of the closed case (50) is recessed into a hemispherical surface. ■ Each branch injection port 65) is provided at the same height from the bottom surface of the case 60).
The sandblasting nozzle branching device described in 2.