JPS594979A - Welding device of engine valve face - Google Patents

Abstract

PURPOSE:To form an extremely outstanding welded surface on the surface of an engine valve face, by using the elasticity of rubber of the O-rings provided to upper and lower rolls in feeding positively a filler metal which is an ultrahigh heat-resistant alloy to a TIG torch. CONSTITUTION:A valve 1 is placed on a base metal 2, and a piston rod 10 is brought down to hold the axial end part of the valve 1 with a guide metal 12. An inert gas is first released from a TIG torch 29; at the same time, a filler rod 15 is fed and advanced quickly to the welding point. The torch 29 is then ignited to generate an arc and is also begun to oscillate to start feeding the bar 15 for welding. The metal 2 is rotated together with the valve 1 and when both rotate about one turn, the welding operation is completed. Thereafter, the bar 15 is retreated quickly and is stopped, and the one cycle including turning off of the electric current to the TIG torch, the stoppage of the oscillation, the stoppage of the inert gas supply, the stoppage of the base metal rotation, the ascending of the piston rod and the unloading of the work of the valve 1 is completed. Since the elasticity of the rubber of the O-rings provided to upper and lower rolls 18, 19 is used in feeding the bar 15, the feed function having high reliability is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for welding a super heat-resistant alloy material onto the face surface of engine pulp using a tungsten inert gas method (hereinafter referred to as TIG).

In recent years, due to the performance demands of engines, super heat-resistant alloy materials are often welded to the face of engine pulp (hereinafter referred to as pulp). Super heat-resistant alloy materials include cobalt-based, nickel-based, and ferrite-based alloys, all of which maintain strength at high temperatures and have excellent corrosion and wear resistance, and each can be used depending on engine performance. Conventionally, these super heat-resistant alloy materials have been welded to the valve face using oxygen acetylene gas. In this welding using oxygen acetylene gas, there are several problems in the quality of the material in the bath-bonded part of the pulp. When oxy-acetylene is welded with a gas, the welding material is welded without preheating the base material at the welding point, but since the flame temperature of acid and elementary acetylene is high, the structure of the base material becomes coarse due to the thermal effect. The structure of the welding material also becomes larger than standard. This reduces the high-temperature strength of the base material, and the welding material also becomes insufficiently custom-made as a super heat-resistant alloy.

In addition, the carbon contained in the oxygen acetylene gas, especially acetylene, is charred into the deposited material and becomes more carbon than the standard component of the welded material, which increases the hardness of the welded material and makes it difficult to cut after welding. There are problems such as an increase in the difficulty of processing.

In contrast, the above-mentioned problems hardly occur with the TIG method. The TIG method uses energized N (contact) welding in an inert gas, and there is no need to preheat the underlying base material, allowing welding by directly melting the welding material. In the case of TIG, the welding conditions can be precisely controlled, so there is no coarsening of the structure of the base material or welding material, and there is no cause of decarburization, so stable quality can be ensured without changes in components. .

However, when attempting to automate the welding of a super heat-resistant alloy material to a valve face using the TIG method, various problems arise. The first is TI of the welding material, which is a super heat-resistant alloy material.
G) - Difficulty in reliably feeding the welding material to the valve face.The second problem is the tendency of the molten bead of the welding material applied to the valve face surface to be medium and high.

The present invention completely eliminates these problems and provides a melting M device that can form an extremely excellent bathing surface on the valve face surface.

A device for welding a super heat-resistant alloy material to a valve face using a TIG torch will be described in detail below.

FIG. 1 shows a state in which another material different from the base material is welded to the face surface of the pulp. That is, the face surface of the pulp 1 is formed into a convenient shape for welding, and this pulp is to be welded with a welding material 1a of a super heat-resistant alloy of cobalt-based, nickel-based, or ferrite-based. 1 welding 1-1j is performed on the base metal 2 shown in Figure C. At the bottom of the base metal 2, there is a bearing 3 that rotatably holds the shaft 4 of the base @2, a gear 5 is fixed to the shaft 4, and a pinion 6 fixed to the shaft of the variable speed motor 7 meshes with the bearing 3. The base metal 2 connected to the shaft 4 is rotated. A rotary joint 8 is attached to the lower end of the shaft 4, and cooling water enters from the arrow B, passes through the inner hole of the shaft 4, cools the base metal 2, and is discharged from the arrow B. Also base metal 2
A carbon brush 14 is pressed onto the outer surface of the flange by a loose method (not shown) using a spring force or the like.

This carbon brush 14 functions as a negative electrode for TIG welding and conducts current. Bearing 3
is screwed onto the top surface of a box-shaped mount (not shown) that houses the gear 5, rotary joint 8, pinion 6, and variable speed motor 7 therein.

The trap is such that the welding rod 15 is fed in by two rollers. The lower roller 19 is fixed to one end of a supported drive shaft 24 via a bearing (not shown).
A worm wheel 25 is fixed to the other end, and a worm 26 fixed to the shaft of a variable speed motor 27 meshes with this.

The upper roller 18 is rotatably mounted approximately at the center of the roll holder 21 by a shaft 20.

One end of the roll holder 21 is connected to the mounting hardware 17 by a shaft 22.
At the other end of the roll holder 21, an eye is pushed down by a spring 23 around a shaft 22 using a bolt and a nut, and an upper roller IB is attached to the outer surface of the lower roller 19. A welding rod 15 is sandwiched therebetween. The spring force of the spring 23 is adjusted using the nut of the L eye bolt.

The mounting hardware 17 is provided with guides 16a1 and 16b for the welding rod 15 before and after these rollers, and the welding rod 15
orient it so that its tip faces the weld area on the valve canopy face at an angle that accommodates it. A limit switch 28 is attached to a part of the mounting hardware 17 above the welding rod 15 behind the guide 16b, and monitors the passage of the end of the welding rod 15. When the final end of the welding rod 15 passes through the contact of the limit switch 28 and reaches the feed roller, the switch is turned OFF.
The operation of all mechanisms will stop. Welding rod 15 in this case
The limit switch 28 secures the amount of one cycle required for welding the length between the feed rollers. Welding rod 1
5 can be used either with a predetermined length or with a coil. The two rollers for feeding the welding rod 15 described above are preferably of the same size and shape, and the outer surfaces of the upper roller 18 and lower roller 19 are provided with two semicircles separated from their centers as shown in FIG. A groove 42' is provided in which a rubber O-ring 42 is fitted. The solid O-ring 42 is a general type and preferably has a hardness of 70 to 90 rubber. The material of the rows 218 and 19 may be a common metal such as carbon steel.

F is the mounting hole of the roller and means GFi keyway.

The practical operation is shown in a partial sectional view in FIG. Upper roller 1
The welding rod 15 is held between the nine O-rings 42 and the lower roller 19 at the center thereof. ``Although the welding rod 15 may have a bend, the bend is absorbed by the flexibility of the rubber of the O-ring 42, so there is no concern that it will slip. For example, when the welding rod 15 is made of a cobalt-based alloy, its hardness is as high as 7Qk, depending on the hardness, and the tensile strength is 7Qk! , 9/tm'. If the roller corresponding to this is made of gold a, welding I
l! It will be necessary to have hardness and tensile strength that are complementary to the above. If the hardness and tensile strength of the roller is low, it will lead to wear, and if the hardness is low, it will become slippery. As mentioned above, the O-ring 42 used for the roller is made of rubber hardness *qo-deθ, and those with this hardness practically do not have any slippage between it and the welding rod 15, so no wear occurs. . However, if used for a long time, fatigue will occur due to aging, but in that case it can be easily replaced. Q IJng42
Since the service life is calculated, the running cost is also negligible.

TIG)-chi 29 is provided with an arbitrary angle corresponding to the face surface to be welded on the valve 1, and can perform oscillation L) in a direction across the face surface during welding. TIG)-chi 29 is attached to one end of the torch holder 80, and the other end of the torch holder 80 is attached to the upper end of the shaft 81.

The shaft 81 is swingably supported by a bearing (not shown).

An oscillation plate 82 is fixed to the lower end of the shaft 81. The eccentric cam 88, which is housed in the notch of the cam bolter 84 and provided on the spline shaft 85, is located at a position where its outer surface is in contact with the side surface of the oscillation plate 82. The spring 41 is on the side of the eccentric cam 88, one end is hung on the side of the oscillation plate 82, and the other end is attached to the oscillation mounting box (not shown).
The inner wall of the building has been carved out and the oscillation grade is 82.
is constantly kept in close contact with eccentric cam 8B. The eccentric cam 8B#'i is spline-engaged with the spline shaft 35 with a loose fit. The rotation of the eccentric cam 33 causes the oscillation grating 32 to move toward the shaft 3.
1 on the axis at a predetermined angle, and therefore this swing angle torch holder 30 swings via the shaft 31. The spline shaft 35 is supported via a bearing (not shown),
The -y# trap has a fixed gear 39 and a variable speed motor 40.
The eccentric cam 33 is engaged with the pinion 38 fixed to the shaft of the eccentric cam 33 and moves with the appropriate rotation. A number of guide shafts 36 are passed downwardly through the cam holder 34 in parallel and loosely, so that the cam holder 34 can swing on the guide shafts, and both ends of the guide shaft 360 are attached to an oscillation mounting box (not shown). Both [YK installation. An adjustment screw 37 is screwed into the center of the cam holder 34 above the guide shaft 36, and the adjustment screw 37 is supported by a bearing (not shown), and a let handle 42 is fixed to one end of the screw.

It is desirable that the bearing portion be constructed so that the adjustment screw 37 does not move in the longitudinal thrust direction. By operating the handle 42, the cam holder 34 and trick cam 33 can be moved to change the oscillation width of the TIG torch 29.C of the TIG torch 29 is an inert gas pipe, and D is a torch. The cooling water pipe, E is a positive power supply conductive wire.The welding angle of this TIG)-chi 29 is changed by rotating the entire oscillation mounting box (not shown).At the bottom of the oscillation mounting box, there is a Multiple Sly P
(not shown) is provided with a structure that allows the height of the torch tip position to be moved forward, backward, left and right to adjust the VF4.

A cylinder 9 is provided above the axis of the base metal 2.

The power source for this cylinder 9 may be hydraulic or pneumatic.

A threaded end trap of the piston rod 10 of the cylinder 9 is screwed onto a guide metal body 11 and locked with a nut 13. The guide hardware 12 is in a rotatable state and is attached to the guide hardware main body 11F.
The guide hardware 12 has an inner hole that accommodates and holds the outer diameter of the stem of the pulp 1, and maintains the axis of the pulp 10 when it rotates.

The guide hardware 12 can be replaced when the stem diameter of the valve 1 changes. Also 9 shillings
The mounting position can be adjusted up or down depending on the length of the pulp 1.

To explain the operation of this device, first, the pulp 1 is placed on the base metal 2. The piston rod 10 is lowered and the guide metal fitting 12 holds the axial end of the pulp 1. First, the inert gas starts to be released from the TIG hole 29, and at the same time, the welding rod 15 moves forward toward the welding point. (
Next, the TIG)-chi 29 (which is retracted when stopped) ignites an arc, and at the same time oscillation starts, and the welding rod 15
starts welding feed, the base metal 2 starts rotating together with the pulp 1, and the welding operation ends after approximately 1/2 rotation. That is, welding rod 1
5 is fast return υ backward and stop, TIG torch current OFF, oscillation stop, inert gas stop, alloy rotation stop,
The piston rod rises, the pulp 1 workpiece is unloaded, and the 1 cycle ends. The /4 loop 1 can be attached and detached manually, but by using a loading device it becomes fully automatic and can be operated unmanned. By setting and programming the cycle time, stable quality welding can be achieved.

One of the important points in this welding operation is that there should be no unevenness or slippage in the feeding speed of the welding rod. If there is unevenness or slippage, it is not possible to ensure a uniform welding surface. The feeding of molten Mu according to the present invention is carried out by the frictional force using the elasticity of the rubber of the O-rings provided on the upper and lower rollers, and the wedge effect sandwiched by the nine O-rings on the upper and lower rollers, so it is highly reliable. Demonstrates high feed function. Another point is oscillation. If TIG)-chi oscillation is not performed during welding, the bath melt bead will not spread due to surface tension and will tend to break in the middle and height, leading to increased consumption of welding material.

By performing oscillation with appropriate gas amplitude and speed, it is possible to spread the bead, obtain the minimum welding height, and obtain a welding surface without waviness even under pressure on the circumference of the valve face. can.

Since there are many rare metals in the composition of super heat-resistant alloys, the consumption of welding material must be kept to a minimum during welding. This device according to the invention makes it possible to maintain reliable quality with a minimum amount of welding, especially when welding various super heat-resistant alloys to engine valve faces using TIG).

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of pulp with a different material welded to the face surface, and Figure 2 shows the main mechanism of the device for welding a super heat-resistant alloy rod to the face surface of engine pulp using a TIG torch in the present invention. FIG. 3 is a cross-sectional view of a welding rod feeding roller, and FIG. 4 is a partial cross-sectional view of a state in which the O-rings of the upper and lower welding rod feeding rollers sandwich molten MII. 1...Pulp, 2...Base metal, 15...Welding rod, 1
8.19...roller, 29...TIG torch.

Claims (1)

[Claims] 1) A rotationally driven alloy, a device for holding the axial end of pulp placed on the alloy, a TIG) on the face of the pulp, and a TIG) facing the torch. and a feeding device for supplying a welding rod, and the TIG)-chi is swung across the valve face surface. Engine valve face welding equipment with all features. (2) The welding rod feeding device includes upper and lower rollers, one of which is rotationally driven, each roller having a pair of O-rings made of Dem on its circumferential surface, and the welding rod is attached to the upper and lower rollers. −
An engine valve face welding device characterized in that it is held by an IJ ring.