JPS60241958A - Feeder of powdery material - Google Patents

Abstract

PURPOSE:To keep the amt. to be added of a powdery material constant by providing a metering device for carrying out a specified amt. of the powdery material in a feeder for supplying the powdery material to a plasma torch. CONSTITUTION:In a device 25 for confirming the supply amt. of a powdery material, windows 20a and 20a are formed at a part of an introducing pipe 20 which is inserted into a main body 28, and the supply amt. of a powdery material 5 can be obtained by confirming that the optical fiber 39 from a luminescent element 38 and the optical fiber 41 from a photodetector element 40 are faced to each other through the windows 20a and 20a, and measuring the luminous energy of the light passing through the windows 20a and 20a. An inert gas is supplied into the main body 26 through a pipe 42 for supplying a back pressure gas, and the pressure in the main body 26 is made higher than the pressure in the introducing pipe 20. Accordingly, the amt. of the powdery material 5 leaking from the window 20a is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for supplying a powder material such as a high hardness metal to a plasma torch for forming a remelted hardened layer on a part of the surface layer of a cast iron member, for example.

In cast iron members such as camshafts, parts of the surface layer such as sliding surfaces are required to have better wear resistance and pitting resistance than other parts.

For this reason, it is considered to remelt a part of the surface layer with a plasma torch, add high hardness metal powder to this melted part, and rapidly cool it to form a remelted hardened layer with excellent properties such as wear resistance. It will be done.

In order to add metal powder to the molten part during the remelting hardening process, it is necessary to suspend the metal powder in dry air or inert gas and supply it to the plasma torch through an inlet pipe. However, when this type of supply method is adopted, metal powder adheres and accumulates on the inner wall of the introduction pipe during floating conveyance, and the pipe diameter becomes thinner over time, making it impossible to stably supply metal powder. As a result, variations occur in the amount added, which affects the quality of the processed product.

For this reason, it is conceivable to plate the inner wall of the introduction tube or to construct the introduction tube itself from lumber 1 with a low coefficient of friction, but it is not possible to sufficiently prevent the metal powder from adhering to the introduction tube.

The present invention has been made in view of the above-mentioned problems, and its purpose is to re-melt a part of the surface layer of a cast iron member using, for example, a plasma torch, and inject powder such as high-hardness metal into the molten part. To provide a powder material supply device capable of always stably supplying a certain amount of powder material to the plasma torch when adding the material to form a remelted and hardened layer having excellent properties such as abrasion resistance. It is in.

1; In order to achieve the above object, the supply device according to the present invention connects a discharge device for measuring and conveying a powder material such as metal powder and a plasma torch through a powder material introduction pipe, and connects the powder material introduction pipe and the discharge device. The main idea is that a vibration device is installed near the connection with the powder material introduction tube to transport the powder material while vibrating the powder material introduction tube, and a device for confirming the supply amount of powder material is attached to a part of the powder material introduction tube. do.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the overall configuration of a powder material supply device according to the present invention, and in the figure (1) is a powder material delivery device, and this delivery device (1) is a closed box body (2). An inert gas such as argon gas is supplied into the box (2) through the introduction pipe (4) to create positive pressure inside the box (2). I try to keep it that way.

Further, a hopper (6) for storing powder material (5) is provided inside the box (2). Here, the powder material (5) is, for example, a single substance or a compound of a high hardness metal such as Cr, Mo, Ni, W, V, or Nb in a powder state. A powder material measuring device (7) is disposed below the outlet (8a) of the leak 31-shaped lower part of the hopper (6). As shown in Figures 1 and 2, this metering device (7) is connected to the bottom plate (3).
The rotation axis (θ) of the motor (8) installed below the bottom plate (3
), and a turntable (10
) is mounted so that it rotates in a horizontal plane. On the other hand, as shown in Fig. 2, a base (11) that can be moved up and down is provided above the turntable (lO).
The IT measurement plate (13) is pivoted to the bracket (12) of the turntable (IQ) so that it has clearance with the two sides of the turntable (IQ). In (14), the positional relationship with the turntable can be adjusted in the horizontal plane. Further, a funnel-shaped receiving member (+5) is provided below the measuring plate (13) with the turntable (10) in between.

In addition, on one side of the turntable (10) facing the it it plate (13), there is a measuring plate (1) whose position can be adjusted downward.
113), and with this Atfi plate (113),
The surface of the powder material (5) supplied from the outlet (6a) is leveled on the turntable (10).

The powder material (5) stored in the hopper (6) is
+ (8a) is supplied to the turntable (10) J2, and the powder material (
5) is scraped off by the counting plate (13) by rotating the turntable (10), and is supplied falling into the receiving member (15). Here, the supply amount of the powder material (5) can be adjusted by moving the base (II) up and down and adjusting the clearance between the measuring plate (13) and the J-plane of the turntable (10), or by Board (13) or (+13
) and the turntable (10).

The lower half of the receiving member (15) is held longitudinally by the bottom plate (3), and the lower end of the receiving member (15) protruding downward from the bottom plate (3) is an ultrasonic vibrator! (+8) is fitted into the vibrator (17). That is, a passage (18) is vertically provided in the vibrator (17), and the lower end of the receiving member (15) is fitted into four large diameter parts formed at the upper end of this passage (18). Also, the passage (1
An inverted T-shaped join (+9) is fitted into the four large diameter parts formed at the lower end of 8). Here, the inner diameter of the passage (18), the inner diameter of the lower half of the receiving member (15), and the joint (
19) The inner diameters of the passages formed inside are set equal.

In addition, the powder material is introduced v(2
0).

(20) is connected at one end. This introduction tube (20) is made of stainless steel or ceramic material, and the other end is held through the shield cap (22) of the plasma torch (21). A passage (24) for plasma gas spraying is formed in the extension line of the introduction pipe (20) and the nozzle tip (23) while being held by the shield cap (22).
The extended line of the curvature is arranged to substantially intersect with the extended line of the curvature at the lower position.

Further, a powder material supply amount confirmation device (25) is attached to the middle portion of the introduction pipe (20). As shown in detail in FIG. 3, this supply amount confirmation device (25) has a cylindrical body (26) with a pair of outward protrusions (27) formed in the middle part. Large diameter holes (2B) and (29) are provided vertically in a part and lower part of (26), and a small diameter hole (30) is provided vertically in the middle part. Further, a horizontal hole (31) is bored in the protrusion (27), one end of which opens into the small diameter hole (30), and the other end of which opens to the outside. Furthermore, the upper end of the large diameter hole (28) and the lower end of the large diameter hole (28) have tapered portions (28a) and (29a) that expand outward, and the upper end of the small diameter hole (30) also forms a similar tapered portion (30a).

Then, sealing plugs (32) and (33) are pushed into the tapered parts (28a) and (29a) from the outside, and threaded parts are carved on the outer periphery of one end and the lower end of the main body (26). Screw the lid members (34) and (35) onto the lid members (34) and (35).
34) and (35) hold the sealing plugs (32) and (33) in the state pushed into the main body (26). Here, the sealing plugs (32) and (33) have through holes (32a) and (33a) for press-fitting and holding the introduction tube (20), and also have a lid member (33a).
34) and (35) have holes (with a diameter larger than that of the introduction pipe (20)).
34a) and (35a) are formed. Therefore, the through holes (32a) and (33a) of the sealing plugs (32) and (33)
) with the introduction tube (2o) penetrating and held therein, insert the main body (2o)
6) Insert the introduction tube (2o) into the lid member (34), (
35), the main body (26) connects to the introduction tube (20
) is supported. In addition, the introduction pipe (20) is inserted into the main body (26).
When inserting the tube, make sure that the windows (20a), (20a) formed in the introduction tube (20) face the horizontal holes (31), (31) formed in the protrusion (27).

In addition, the horizontal holes (31) and (31) are provided with tubular sealing plugs (
3B) and (3B), screw the lid members (37) and (37) from the outside, and then attach the one sealing column (36).
The optical fiber (39) led out from the light emitting element (38) is press-fitted into the through hole (38a) formed in the other sealing plug (36), and the light receiving element (40) is inserted into the through hole (38a) formed in the other sealing plug (36). The optical fibers (41) led out from the
The end protruding from the window (20) of the introduction tube (20)
0a) and (20a) to face each other.

Furthermore, a large diameter hole (28) is provided in the upper side wall of the main body (26).
A back pressure gas supply pipe (42) facing the large diameter hole (29) is installed at the bottom of the side wall, and a pipe (43) for carrying out leaked powder material facing the large diameter hole (29) is installed.

In the above, the powder material (5) supplied from the hopper (6) to the receiving member (15) by the metering device (7) is vibrated by the ultrasonic energy of the ultrasonic vibrator (16) and the inlet tube ( 20), the inert gas from the pipe (4) attached to the bottom plate (3) passes through the introduction pipe (20) by the transport action of the pipe (4) and the action of gravity, and is transported to the plasma torch (21), where the plasma arc ( 44) supplied inside.

Then, the powdered material (5), such as a high-hardness metal, is enclosed in the plasma arc (44), and the cast iron member (5) is heated at high temperature and high speed.
45) into the melting zone (46) formed on the surface layer, and is uniformly dispersed or melted in the melting zone (46).

By the way, in the powder material supply amount confirmation device (25), windows (20a), (20a) are formed in a part of the introduction pipe (20) inserted into the main body (28), and these windows ( 20a
).

(20a), an optical fiber (39) from the light emitting element (38) and an optical fiber (4) from the light receiving element (40).
1) are facing each other, so windows (20a) and (20
By measuring the amount of light passing through a), the amount of powder material (5) supplied can be determined. Furthermore, an inert gas such as argon gas is supplied into the main body (28) through a back pressure gas supply pipe (42) so that the pressure inside the main body (2B) is higher than that inside the introduction pipe (20). window (20a), (
The amount of powder material (5) leaking from 20a) is extremely small, and the leaked powder material (5) is discharged to the outside via the discharge pipe (43) and recovered. In addition, with this structure, the discharge pipe (43) is closed, and the back pressure gas supplied from the supply pipe (42) is passed through the window (20a) of the introduction pipe (20).
(20a) into the inlet pipe (20) to form a window (2Oa).

It is also possible to prevent powder from leaking out from (20a).

In addition, in the implementation side, the ultrasonic vibration device was attached to the receiving member that forms the connection between the introduction pipe and the unloading device, but in addition to the receiving member, it is also possible to install a vibration device in the middle of the introduction pipe, for example. Good too.

As is clear from the above description, according to the present invention, a cast iron member is remelted with a plasma torch, and a powder material such as a high hardness metal is added to the melted part to remelt and harden it to obtain desired characteristics. When forming the treatment layer, the apparatus for supplying powder material to the plasma torch is equipped with an Atfft device for transporting a predetermined amount of powder material, making it possible to accurately supply a predetermined amount of powder material. Furthermore, since each member used to transport the powder material to the plasma torch is vibrated by a vibrating device using ultrasonic waves, the powder material does not adhere to the inner wall of the introduction pipe, and the diameter of the pipe changes over time. The amount of powder material added can be maintained constant, and processed products with consistent quality can be obtained. In addition, a supply amount confirmation device is attached to a part of the powder material introduction pipe, so the powder material can be confirmed even during processing, and the metering device is activated by the signal from the supply amount confirmation device to supply the powder material. It is also possible to change the amount.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the overall configuration of a powder material supply apparatus according to the present invention, FIG. 2 is an overall perspective view of a measuring device, and FIG. 3 is a sectional view of a powder material supply amount confirmation device. In the drawings, (1) is a powder material delivery device, (2) is a sealed box body (5) is a powder material, (6) is a hopper, (7) is a weighing device,
(10) is a turntable, (13) is a meter plate, (16)
) is an ultrasonic vibration device, (19) is a receiving member, (2o) is an introduction pipe, (21) is a plasma torch, (25) is a powder material supply amount confirmation device, and (45) is a cast iron member. Patent Applicant Kida Giken Kogyo Co., Ltd. Agent Patent Attorney Kuni Ohashi Patent Attorney Yu2 Koyama

Claims (1)

[Claims] A powder material delivery device that weighs and transports powder materials such as metal powder, and a powder material introduction device in which one end is connected to the powder material delivery device and the other end is connected to the plasma torch in order to supply the powder material to the plasma torch. A powder material comprising a pipe, a vibrating device disposed near a connecting part of the powder material introduction pipe to a powder material delivery device, and a powder material supply amount confirmation device attached to a part of the powder material introduction pipe. feeding device.