JPH07204846A - Build-up welder - Google Patents

Abstract

PURPOSE:To provide a build-up welder capable of preventing the supercooling of a valve head from occurring and performing satisfactory build-up welding. CONSTITUTION:This welder is equipped with a welding torch which performs build-up welding on the valve head of a raw material valve A, and a raw material valve holding means which holds the raw material valve obliquely so as to confront the welding torch with the valve head of the raw material valve. The raw material valve holding means is equipped with a base metallic block 45 with which the end face on the valve head side of the raw material valve is abutted, and a cooling means 47 which cools the base metallic block. A cylindrical part 45c is formed on the upper terminal part of the base metallic block, and the diameter D of the cylindrical part is formed a little larger than the diameter (d) of the valve head of the raw material valve. Also, it is desirable to form the diameter D of the cylindrical part of the base metallic block larger than the diameter (d) of the raw material valve to be abutted by 0.5-5.0mm. Also, it is desirable to form the upper plane of the cylindrical part of the base metallic block in a flat plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a build-up welding apparatus for build-up welding dissimilar materials to a valve head of an intake valve or an exhaust valve of an internal combustion engine.

[0002]

2. Description of the Related Art As is well known, a valve head of an air supply valve or an exhaust valve of an internal combustion engine is repeatedly contacted with a valve seat at high speed, so that the valve head is required to have high wear resistance. Therefore, as shown in FIG. 6, a material having high wear resistance (for example, Co—Cr—W) is used for the valve head 2 of the valve 1.
(C-based alloy) is overlay welded (see 3 in the figure), and then the overlay welded portion is machined (for example, ground) to have a desired shape.

Here, in overlay welding on a valve head, an operator holds a valve (hereinafter referred to as a material valve) on which overlay welding is performed by a holding jig and manually performs Co-Cr-
Overlay welding is performed using a WC alloy welding rod. Here, the holding jig is provided with a base metal block which is in contact with the end surface on the valve head side and has a size considerably larger than the diameter of the valve head.

At this time, there is a problem that the base metal block becomes high temperature due to the heat transferred to the base metal block of the holding jig during welding.

In order to solve such a problem, it is conceivable that a cooling water passage is arranged inside the base metal block and cooling water is caused to flow therethrough for cooling.

[0006]

However, in the case where the base metal block is cooled by the conventional holding jig, the size of the base metal block is considerably larger than the diameter of the valve head, so that heat is generated during welding. When the valve head is excessively escaped, the valve head, especially the peripheral portion of the thinned valve head, is overcooled, and as a result, overlay welding failure may occur.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a overlay welding apparatus capable of preventing overcooling of a valve head and thereby performing favorable overlay welding. To do.

[0008]

The overlay welding apparatus according to claim 1 of the present invention is a overlay welding for overlay welding different materials to a valve head of an intake valve or an exhaust valve of an internal combustion engine. A welding torch that performs overlay welding on a valve head of a material valve to be overlay welded, and a material valve that holds the material valve at an angle so that the valve head of the material valve faces the welding torch. Holding means, the material valve holding means comprises a base metal block with which the end surface of the material valve on the valve head side abuts, and a cooling means for cooling the base metal block, the upper end portion of the base metal block A columnar portion is formed in the column, and the diameter of the columnar portion is slightly larger than the diameter of the valve head of the material valve with which the columnar portion abuts.

According to the overlay welding apparatus of the second aspect of the present application, in the overlay welding apparatus of the first aspect, the diameter of the valve head of the material valve with which the diameter of the cylindrical portion of the base metal block abuts. It is formed larger by 0.5 to 5.0 mm.

According to a third aspect of the overlay welding apparatus of the present application, in the overlay welding apparatus of the second aspect, the upper surface of the columnar portion of the base block is flat.

[0011]

According to the overlay welding apparatus of the first aspect of the present invention, the material valve is held obliquely by the material valve holding means so that the valve head of the material valve faces the welding torch. Then, the welding torch performs overlay welding on the valve head of the material valve, and the valve that becomes the product (hereinafter,
Product valve. ) Is manufactured.

Here, the base metal block is cooled by the cooling means to prevent the base metal block from being heated to a high temperature by the heat during welding. Here, a columnar portion is formed at the upper end portion of the base metal block, and the diameter of the columnar portion is set to be slightly larger than the diameter of the valve head of the material valve with which the base metal block abuts. The mass in the vicinity of the portion where the valve head abuts can be made appropriate, and supercooling of the valve head, particularly the peripheral portion of the valve head, is suppressed. As a result, welding defects (for example, peeling of the built-up portion, mixing of undissolved powder, etc.) due to overcooling can be reduced, and overheating of the base metal block can be suppressed.

According to the overlay welding apparatus of the present invention, since the diameter of the base metal block is larger than the diameter of the valve head by 0.5 mm or more, the mass of the cylindrical portion of the base metal block becomes too small, and Prevents overheating of the gold block and valve head, and prevents weld failure (for example, melting of the alloy of the material valve into the overlay to cause hardness decrease in the overlay) due to overheating. it can. In addition, since the diameter of the base metal block is smaller than the diameter of the valve head by 5.0 mm or more, the mass of the cylindrical portion of the base metal block is prevented from becoming too large and the material valve supported by the base metal block is prevented from being overcooled. It is possible to reduce welding defects (for example, peeling of the buildup portion, mixing of undissolved powder, etc.) due to supercooling.

According to the overlay welding device of the third aspect of the present application, since the upper surface of the cylindrical portion of the base metal block is flat, the peripheral portion of the valve head is released without coming into contact with the base metal block. Therefore, when it was loaded in the groove-shaped portion, uneven cooling was sometimes caused due to uneven contact with the base metal block, and poor build-up could occur. Good overlay welding is possible by effective cooling.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A build-up welding apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

The overlay welding apparatus according to the present embodiment includes a material valve stock means 10 for storing a material valve A for overlay welding and a welding means 20 for overlay welding on a valve head of the material valve A. , The material valve A so that the valve head of the material valve A faces the torch 25 of the welding means 20.
From the material valve holding means 30, the material valve holding means 30 for holding the product at an angle and rotating it about the axis, the product valve stock means 50 for storing the product valve B which has been welded by the welding means 20, and the material valve stock means 10. The material valve A is conveyed to the material valve holding means 30 and the product valve B is held by the material valve holding means 3.
And a valve transfer means 60 for transferring the product from 0 to the product valve stock means 50.

The material valve holding means 30 is provided with a rotary table means 31 against which the end surface of the material valve A on the valve head side abuts, and a valve stem of the material valve A which is spaced apart obliquely above the rotary table means 31. Is pressed from above and the material valve A is pressed between the rotary table means 31 and the rotary table means 31.
And a valve mounting / positioning means 33 for positioning and mounting the material valve A substantially coaxially with the rotary shaft of the rotary table means 31.

The valve mounting / positioning means 33 has a support member 3 having a V-shaped groove formed at its tip end to abut against the side surface of the valve stem of the material valve A to obliquely support the material valve.
4 and an axial moving means (for example, an air cylinder) 3 for moving the supporting member 34 in the axial direction of the material valve A.
5 and a radial moving means (for example, an air cylinder) 3 for moving the supporting member 34 in the radial direction of the material valve A.
6 and. The support member 34 is integrally fixed to the advancing / retreating member (for example, piston rod) of the radial moving means 36, and the radial moving means 36 is fixed to the advancing / retreating member (for example, piston rod) of the axial moving means 35. It is attached integrally, and when the advancing / retreating member of the axial moving means 35 is moved back and forth, the supporting member 34 moves together with the radial moving means 36 in the axial direction of the material valve A.

The valve conveying means 60 has the one point 62 on the fixed side 61 as a center, and the material valve stock means 10 is provided.
To the material valve holding means 30, from the material valve holding means 30 to the product valve stock means 50, and from the product valve stock means 50 to the material valve stock means 10. The moving arm means 63, the rotary member 64 rotatably attached to the tip end side of the swing arm means 63, and the rotary member 64 at the outer peripheral portion of the rotary member 64 are attached at two positions sandwiching the rotary shaft. Material valve A or product valve B
And two chuck means 65 and 66 for sandwiching the valve stem from the side.

A swivel base 67 is mounted on the fixed side 61 so as to swivel in a horizontal plane, and one end of the swing arm means 63 is connected to the upper part of the swivel base 67. The swing arm means 63 includes a first arm member 63a swingably connected to the swivel 67 and the first arm member 63a.
Second swingably connected to the tip of the arm member 63a of the
The arm members 63b and 63b are provided, and the swing angles of the arm members 63a and 63b can be changed independently of each other. A motor 68 is attached to the tip of the second arm member 63b so as to change the relative angle with the second arm member 63b. 64 is fixed.

As shown in FIG. 2, the chuck means 65 and 66 have two cylinders 69 arranged side by side in the rotational direction of the rotary member 64, and each piston rod 69a of these cylinders 69 has a valve stem. A contact member that abuts is attached.

The material valve stock means 10 is provided with an alignment supply means (for example, a parts feeder) 11 for aligning and transporting the material valves A one by one.

The welding means 20 is provided with a guide column 21 standing upright in the vertical direction, a movable table 22 movably attached to the guide column 21 in the vertical direction, and horizontally movable on the movable table 22. A movable table 23 that can be attached,
A bracket 24 fixed to the lower end of the moving table 23,
A welding torch 25 is attached to the tip of the bracket 24 in the vertical direction, and a powder supply means 26 for supplying the welding torch 25 with a powdered welding material. The position of the welding torch 25 can be adjusted by moving the moving bases 22 and 23 in the vertical and horizontal directions.

The powder supply means 26 includes a hopper 26a for storing a powdery welding material, a pressure feed pipe 26b for feeding the welding material in the hopper 26a to the welding torch 25 by an argon gas flow, and the hopper 26a. And a weight measuring means (not shown) (for example, a load cell) for adjusting the supply amount of the welding material to an appropriate amount. The weight measuring means measures the total weight of the weight of the hopper 26a itself and the stored welding material, and the weight of the welding material for overlay welding on one material valve A is the total weight. Since the weight is small and cannot be measured accurately, the weight of the welding material used was determined from the weight difference before and after the overlay welding was performed multiple times (for example, 100 times), and this weight was preset. As compared with the reference value, the flow rate of argon gas is adjusted to adjust the amount of the welding material pumped.

As shown in FIG. 3, the rotary table means 31 has a support portion 37a (see FIG. 1) on the guide column 21.
The swing block 37 rotatably held by the swing block 37 and the turntable 3 rotatably attached to the swing block 37.
8 and a motor 39 fixed to the swing block 37 and having its rotation shaft connected to the rotary table 38 via a belt 39a.

The turntable 38 includes a box-shaped frame 44,
The box-shaped frame 44 is provided with a base metal block 45 fixed to the upper part thereof, and the box-shaped frame 44 has a double pipe structure including an inner pipe 47a and an outer pipe 47b fixed to the swing block 37. Is rotatably mounted around the cooling pipe 47 via a bearing 46. Further, two grounding mechanisms 48 extending in the radial direction are attached to the side surface of the box frame 44. This ground mechanism 48
A carbon columnar body 48b is mounted in a hollow portion of the outer cylinder 48a so as to be able to move back and forth, and a spring 48c provided at an outer end portion of the outer cylinder 48a abuts the columnar body 48b to a support member 48d for supporting the cooling pipe 47. The columnar body 48b is grounded via a cable 48e that is biased and connected to the columnar body 48b, and is for grounding the base metal block 45 without the bearing 46.

As shown in FIGS. 3 and 4, the base metal block 45 has a flange portion 45a for bolting to the upper portion of the box frame 44, and the flange portion 45a.
And columnar parts 45b and 45c that are continuously provided on the upper part of the. Further, the columnar portion 45b has a tubular shape, and the inner tube 47a of the cooling pipe 47 is housed therein, with the ends thereof facing the back surface of the columnar portion 45c. An end portion of the inner pipe 47a is supported by a support member 47d, and a gap 45e through which cooling water passes is formed between the support member 47d and the back surface of the columnar portion 45c and is supplied from the inner pipe 47a. After cooling the cylindrical portion 45c, the cooling water is discharged from the hole 47f formed in the support member 47d to the outer pipe 47.
It has a structure that flows into b.

Further, as shown in FIG.
The diameter D of c is slightly larger than the diameter d of the valve head of the material valve A. By the way, in this embodiment, the diameter D of the cylindrical portion 45c is equal to the diameter d of the valve head.
Than 0.5 to 5.0 mm, preferably 1.0 to 3.0
It is formed larger by mm. If it is 0.5 mm or less, the mass of the cylindrical portion 45c of the base metal block 45 becomes too small, and the base metal block 45 and the valve head are overheated, resulting in poor welding (for example, build-up portion). If the thickness of the base metal block 45 is 5.0 mm or more, the mass of the columnar part 45c of the base metal block 45 becomes too large and the base metal block becomes too large. The material valve A supported by 45 is overcooled, and the welding failure caused by the overcooling (for example,
This is because peeling of the built-up portion, mixing of undissolved powder, etc.) occur.

As shown in FIG. 1, the valve attaching / detaching means 3
Reference numeral 2 denotes an advancing / retreating block 42 arranged coaxially with the rotary table 38 and having a groove 41 formed at the center for inserting a valve stem.
And a cylinder 43 that is supported by the swing block 37 and that moves the advancing / retreating block 42 forward and backward coaxially with the rotary table 38.

The product stock means 50 has a dolly 51 having wheels 52 attached to its lower surface, and a box-type pallet 53 placed on the dolly 51 and having an open top.
And a sampling chute 54 for taking out a sample of the product valve B every fixed number.

The rotary table 38 of the material valve holding means 30
A valve mounting surface polishing device (not shown) for polishing the upper surface of the rotary table 38 is provided near the base plate 4 of the rotary table 38.
5 is provided so as to be movable between a position in contact with the upper surface of 5 and a position away from the rotary table 38. This valve mounting surface polishing device is provided for flattening the valve mounting surface to which the welding beet is attached.

Reference numeral 71 in FIG. 2 is a cooling water circulating means for circulating cooling water through the welding means 20 and the material valve holding means 30, 72 is a welding power source device for supplying power to the welding means 20, and 73 is a welding power source device. Position of welding torch 25 of welding means 20, welding conditions such as plasma gas conditions, powder supply means 2
6 is a comprehensive control means for controlling the powder supply conditions by 6, the rotation condition of the material valve A by the material valve holding means 30, and the like, and 74 is an operation panel for issuing commands to these.

Next, the operation of the overlay welding apparatus of this embodiment will be described.

First, the shape and material of the valve to be overlay welded, the material to be overlayed on the valve, and the like are input from the operation panel 74. As a result, the optimum operation program for the valve to be overlay welded is selected from the plurality of operation programs set for each valve. According to this operation program, for example, the operation of the valve conveying means 60 (for example, the gripping position by the chucking means 65, 66, the supply position to the material valve holding means 30, the discharge position to the product stocking means 50, the waiting time between each operation) , Sampling timing, number of samples, etc.), welding conditions such as the position of the welding torch 25 of the welding means 20 and plasma gas conditions, powder supply conditions by the powder supply means 26, rotation of the material valve A by the material valve holding means 30. Conditions etc. are set.

After that, a series of operations as described below are automatically performed by the selected operation program. Therefore, even when overlay welding is performed on multiple types of valves made of various shapes and materials, simple operations such as selecting a preset operation program without setting various conditions are sufficient, and setup work can be performed. Easy to do.

That is, as indicated by the chain double-dashed line in FIG. 1, the swivel base 67 on the fixed side 61 is swung to the material valve stock means 10 side, and the swing arm means 63 is swung about the point 62. Then, by rotating the rotating member 64 attached to the tip of the swing arm means 63, the chuck means 65 is also directed toward the material valve stock means 10 side. Then, the alignment supply means 11 is operated to sequentially supply and supply the material valves A, and the valve stems of the supplied material valves A are clamped and held from the side surface by the chuck means 65. The holding position is set by the operation program so as to be an appropriate position according to the shape (length, thickness, etc.) of the valve.

Next, as shown by the solid line in FIG. 1, the swivel base 67 is swung to the side of the material valve holding device 30, and the swing arm means 63 is also moved to the material valve holding device 3 in the same manner.
Swing toward the 0 side. At this time, the motor 64 is rotated with respect to the second arm member so that the material valve A gripped by the chuck means 65 is located at a position sandwiching the rotary shaft of the rotating member 64 with respect to the material valve holding means 30. To

Next, the motor 68 is rotated to rotate the rotating member 6
4 is rotated 180 ° to position the material valve A sandwiched by the chuck means 65 between the base metal block 45 and the advancing / retreating block 42 of the rotary table 38 of the material valve holding means 30.

Next, the axial moving means 35 is connected to the material valve A.
When the tip end portion of the support member 34 reaches a predetermined position by moving the support member 34 in the axial direction, the movement is stopped. The stop position is set in correspondence with the position of the center of gravity of the valve, and is set in advance by the operation program according to the shape of the valve. Next, the radial direction moving means 36 is brought closer to the radial direction of the material valve A so that the tip of the support member 34 is moved to the material valve A.
Abut the outer surface of the valve stem of. After that, the clamping by the chuck means 65 is released, and the swing arm means 63 is moved so as to be slightly separated from the material valve A. As a result, the holding of the material valve A by the chuck means 65 is released, and the material valve A is held in an inclined state by the support member 34. After that, the radial direction moving means 36 is further moved in the radial direction of the material valve A, and the material valve A is moved in the radial direction of the rotary table 38 by the support member 34, so that the axial center of the material valve A and the rotary table 38 are moved. Make it coaxial with the axis of rotation. The movement amount of the radial direction moving means 36 is also preset by the operation program.

Here, when the axis center is adjusted by the swing arm means 63, it is difficult to adjust the axis center by moving in an arc shape due to the nature of the movement such as swing, but the axial direction moving means 35. Since the valve mounting and positioning means 33 including the radial movement means 36 and the radial movement means 36 is used, the axis of the material valve A and the rotation axis of the rotary table 38 can be made coaxial with each other with high accuracy, and will be described later. When overlay welding is performed on the valve head as described above, it is possible to form a high-quality overlay weld portion having a uniform thickness in the circumferential direction.

Next, the cylinder 43 is extended and driven to move the advancing / retreating block 42 forward to the rotary table 38 side. As a result, the upper portion of the valve stem of the material valve A is inserted into the groove 41 formed in the central portion of the advancing / retreating block 42.
The material valve A is pressed and held between the bottom portion of No. 1 and the rotary table 38. Then, the radial direction moving means 36 is driven to be reduced to retract the support member 34 from the outer surface of the material valve A, and then the rotary table 38 is rotated by rotationally driving the motor 39, whereby the material valve A is rotated. Begins to rotate with.

Material valve holding means 3 of the material valve A
The movable table 22 is moved along the guide pillar 21 in parallel with or before and after the attachment to the 0.
Move 3 horizontally. As a result, the welding torch 25 fixed to the moving table 23 is moved to a predetermined position, and a position facing the valve head of the material valve A held (or held) by the material valve holding means 30 from above. Is located in. In this case, the moving amounts of the moving bases 22 and 23 are also preset by the operation program according to the shape of the material valve and the like.

Then, the powder supply device 26 is driven to supply a constant weight of the welding material to the welding torch 25, and a high voltage is applied by the electrode 25d while the welding material is being jetted to melt the welding material. Eject toward the valve head of the valve A. Here, since the material valve A is obliquely supported and rotated by the material valve holding means 30,
The welding material does not flow out to the outside, and the welding material is built up uniformly in the circumferential direction of the valve head. Therefore, it is possible to form a high-quality build-up weld portion that is homogeneous and has little variation.

During this overlay welding, cooling water is supplied to the cooling pipe 47.
Of the inner tube 47a, which is supplied into the inner tube 47a of the base metal block 45a of the base metal block 45,
It is circulated into the outer tube 47b through the gap 47e between the supporting member 47d and the hole 47f. In this way, the base metal block 45, particularly the columnar portion 45c, is cooled by the cooling water. As a result, it is possible to prevent the columnar portion 45c of the base metal block 45 from reaching a high temperature due to the heat generated during welding.

Here, a columnar portion 45c is formed at the upper end portion of the base metal block 45, and the diameter D of the columnar portion 45c is made slightly larger than the diameter d of the valve head of the material valve with which the cylinder block 45c abuts. Because of the base metal block 45,
The mass in the vicinity of the portion where the valve head abuts can be made appropriate, and supercooling of the valve head, especially the peripheral portion of the valve head, can be suppressed. As a result, welding defects caused by supercooling can be reduced. Further, since the diameter is slightly larger than the diameter of the valve head, it is possible to prevent the base metal block from reaching a high temperature. By the way, according to the overlay welding apparatus of the present embodiment, the diameter D of the cylindrical portion 45c of the base metal block 45 is larger by 0.5 to 5.0 mm than the diameter d of the valve head of the material valve with which it abuts. Therefore, since D-d is 0.5 mm or more, it is possible to prevent overheating of the base metal block 45 and the valve head due to the mass of the cylindrical portion 45c of the base metal block 45 becoming too small. Also, D-d is 5.0
Since it is less than or equal to mm, it is possible to prevent the mass of the cylindrical portion 45c of the base metal block 45 from becoming too large and the material valve A supported by the base metal block 45 from being overcooled.

Here, D (columnar portion 4 of base metal block 45)
5c diameter) -d (diameter of the valve head of the material valve A) is 0.5 to 5.0 mm, preferably 1.0 to 3.
The reason for setting 0 mm will be described with reference to FIGS. 7 to 14 and Table 1. 7 to 14, the diameter of the valve head is 3
Stellite No. as a welding material is applied to a material valve of 1.5 mm. 6 (registered trademark) with a plasma current of 105 A
As a result, the product valve obtained by performing build-up welding by gradually changing D-d from 0 to 6.0 mm as shown in Table 1 was cut in the diameter direction of the valve head to enlarge its cross section. It is a thing. The line indicated by the two-dot chain line in the figure shows the profile of the valve head of the material valve A before welding, S
Indicates the base material portion of the material valve, and N indicates the welded portion.

[0047]

[Table 1]

According to FIGS. 7 to 14, it can be seen that when the D-d is 0 mm, the amount of melt-in of the build-up portion is excessive, and when the D-d is 0.5 to 5.0 mm, it is almost the same. It was found that a good melted state was obtained, and D-d was 6.
It can be seen that when it is 0 mm, the penetration is insufficient. Further, according to Table 1, it can be seen that when D-d is 0 mm, the hardness of the built-up portion is lowered, and when D-d is 0.5 to 5.0 mm, almost good hardness is obtained. It can be seen that the hardness is high when D-d is 6.0 mm.

Further, the cylinder portion 4 of the base metal block 45.
Since the upper surface of 5c is flat, when the material valve A is held in contact with the upper surface of the base metal block 45, the peripheral portion of the valve head is released without coming into contact with the base metal block 45. As shown in FIG. 5, a groove 1a having a diameter slightly larger than the diameter of the valve head is formed on the upper surface of the base metal block 1, and the material valve A is housed in the groove 1a so that the valve head is housed. When loaded,
The inner surface of the groove portion 1a of the base metal block 1 and the valve head collide with each other, and the cooling of the valve head that has collided progresses faster,
The cooling of the valve head that was not hitting one side was delayed, resulting in uneven cooling and poor build-up.
In the present embodiment, the periphery of the valve head is the base metal block 4.
Since the valve head is released without coming into contact with it, uneven cooling of the valve head can be suppressed, and the occurrence of build-up welding failure due to this can be reduced.

On the other hand, while the overlay welding is being performed by the welding torch in this manner, the material valve A for the overlay welding next.
Is conveyed from the material valve stock means 10 to the material valve holding means 30 in the vicinity. That is, after the material valve A is supported by the support member 34, the material valve A is released from being held. Therefore, the swing arm means 63 swings, the swivel base 67 swivels, and the rotary member 64 rotates. Done,
The chuck means 66 attached to the rotating member 64 of the valve conveying means 60 faces the material valve A of the material valve stock means 10, and the material valve A is sandwiched by the chuck means 66, and the swivel base 67, the swing arm member 63, etc. To return. At this time, the material valve A clamped by the chuck means 66 is positioned such that the rotary shaft of the rotary member 64 is clamped with respect to the material valve holding means 30.
At a position facing the material valve A during welding, the chuck means 65 not holding the material valve A is provided.

Next, when the overlay welding is completed, the motor 39
To stop the rotation of the turntable 38. Then, the swing arm means 63 is moved in a direction in which the swing arm means 63 is slightly closer to the product valve B, which has been slightly welded by overlay welding, and the rotary member 64 is moved.
The chuck means 65 attached to the product valve which does not hold the material valve is moved toward the product valve B, and the chuck means 65 is arranged so as to sandwich the valve stem of the product valve B. Next, the product valve B is sandwiched and held by the chuck means 65. Next, the cylinder 43
Is reduced to move the advancing / retreating block 42 obliquely upward to release the pressing of the product valve B by the advancing / retreating block 42. In this state, the rotating member 64 is rotated by 180 ° by rotating the motor 68. Then, the product valve B sandwiched by the chuck means 65 moves to a position sandwiching the rotary member 64 and the chuck means 6
The material valve A sandwiched by 6 is located between the rotary table 38 and the advancing / retreating block 42. Then, the material valve A is installed coaxially with the rotary shaft of the rotary table 38 by the same procedure as described above, and the overlay welding is applied to the valve head of the material valve A in the same manner as described above.

Material valve holding means 3 of this material valve A
The product valve B held between the chuck means 65 before and after being held at 0 is conveyed to the product valve stock means 50. That is, the swing of the swing arm means 63 and the swivel base 6
By the turning of 7, the rotating member 64 attached to the tip end side of the swing arm means 63 as shown by the chain double-dashed line in FIG.
Is moved above the pallet 53 of the product valve stock means 50. Then, the clamping of the product valve B by the chuck means 65 is released, and the product valve B is stored in the pallet 53 by a natural drop. Here, the product valve B has been welded to the overlay immediately before and is dropped from an excessively high position. The overlay welded portion is scratched or cracked, or the portion other than the overlay welded portion is scratched. Since a problem such as occurrence occurs, the swing arm means 63 is further swung to move the height of the product valve B sandwiched by the chuck means 65 as close to the pallet 53 as possible, and then dropped. To do. Also, pallet 5
The product valves B are so-called stuffed in 3 without being aligned, but when the product valves B stored in the pallet 53 are few, they are dropped at a low position,
As the product valves B gradually accumulate in the pallet 53, movement control is performed so that the product valves B are gradually dropped at a higher position. As a result, the product valve B is smoothly stored in the pallet 53.

Next, after releasing the product valve B, the swing arm means 63 and the swivel base 67 are swung to sandwich the new material valve A, and the rotation provided at the tip of the swing arm means 63 is performed. The member 64 is the material valve stock means 1
Toward 0, the material valve A is clamped by the chuck means 65 provided on the rotating member 64 in the same manner as in the above-described procedure, and the swinging of the swinging arm means 63 and the swivel base 67 are performed in the same manner as in the above-described procedure. The material valve A is conveyed toward the material valve holding means 30 by turning. After that, by repeating the above-mentioned operation again, overlay welding can be continuously performed on the valve head of the material valve A.

In the overlay welding apparatus according to the present embodiment, the material valve A to be supplied next while the material valve A is held by the material valve holding means 30 and the overlay welding is being performed by the welding torch 25. Since the operations such as transporting or discharging the product valve B to the product valve stock means 50 are simultaneously performed in parallel, the loss time for supplying the material valve A can be reduced. The productivity of overlay welding can be greatly increased.

[0055]

As described above, according to the first aspect of the present invention.
According to the overlay welding device described, a welding torch for overlay welding on the valve head of the material valve to be overlay welded,
A material valve holding means for holding the material valve at an angle so that the valve head of the material valve faces the welding torch, and the material valve holding means makes contact with the end surface of the material valve on the valve head side. A block and a cooling means for cooling the base metal block are provided, and a columnar portion is formed at the upper end of the base metal block, and the diameter of the columnar portion is slightly smaller than the diameter of the valve head of the material valve with which the columnar portion abuts. Due to the large size, the mass of the base metal block in the vicinity of the portion where the valve head contacts can be made appropriate, and it is possible to suppress overcooling of the valve head, especially the peripheral portion of the valve head. As a result, it is possible to reduce welding defects due to overcooling, while suppressing the base metal block from reaching a high temperature.

According to the overlay welding apparatus of the second aspect of the present application, in the overlay welding apparatus of the first aspect, the diameter of the cylindrical portion of the base metal block is 0 than the diameter of the material valve with which the base block abuts. It is formed to be large by 0.5 to 5.0 mm, that is, since it is 0.5 mm or more, it is possible to prevent the base metal block and the valve head from overheating due to the mass of the cylinder portion of the base metal block becoming too small. It is possible to prevent the occurrence of defective welding (for example, melting of the alloy of the material valve into the build-up portion to cause a decrease in hardness of the build-up portion).
Further, since it is 5.0 mm or less, it is possible to prevent the material valve supported by the base metal block from being overcooled due to an excessively large mass of the cylinder portion of the base metal block. , Peeling of the built-up portion, mixing of undissolved powder, etc.) can be reduced.

According to the build-up welding apparatus according to claim 3 of the present application, in the build-up welding apparatus according to claim 2, since the upper surface of the cylindrical portion of the base metal block is flat, the peripheral portion of the valve head is flat. Is released without contacting the base metal block, and good overlay welding can be performed by uniform cooling.

[Brief description of drawings]

FIG. 1 is a front view showing a build-up welding apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing the overlay welding device of FIG.

FIG. 3 is a sectional view showing a material valve holding means in FIG.

FIG. 4 is a partially cutaway view showing a main part of FIG.

FIG. 5 is a reference diagram for comparing the operation of the overlay welding apparatus shown in FIG.

6 is a partial cross-sectional view showing a valve manufactured by the overlay welding apparatus of FIG.

FIG. 7 is an enlarged cross-sectional view in which the overlay portion is cut and enlarged by the overlay welding apparatus of the present embodiment.

FIG. 8 is an enlarged cross-sectional view in which the overlay portion is cut and enlarged by the overlay welding apparatus of the present embodiment.

FIG. 9 is an enlarged cross-sectional view in which a build-up portion by the build-up welding apparatus of the present embodiment is cut and enlarged.

FIG. 10 is an enlarged cross-sectional view in which the overlay portion is cut and enlarged by the overlay welding apparatus of the present embodiment.

FIG. 11 is an enlarged cross-sectional view in which the overlay portion is cut and enlarged by the overlay welding apparatus of the present embodiment.

FIG. 12 is an enlarged cross-sectional view in which the overlay portion is cut and enlarged by the overlay welding apparatus of the present embodiment.

FIG. 13 is an enlarged cross-sectional view in which the overlay portion is cut and enlarged by the overlay welding device of the present embodiment.

FIG. 14 is an enlarged cross-sectional view in which the overlay portion is cut and enlarged by the overlay welding apparatus of the present embodiment.

[Explanation of symbols]

 1 valve 2 valve head 3 overlay welding part 25 welding torch 30 material valve holding means 45 base metal block 45c cylindrical part 47 cooling pipe A material valve D diameter of cylindrical part 45c of base metal block d diameter of valve head of material valve

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroshi Hiroi 1-7-5 Sakuragi-cho, Omiya-shi, Saitama Sonic City Building 21st floor Mitsubishi Materials Corporation Ikuno Works Omiya Office (72) Inventor Masayuki Naoki Asago, Hyogo Prefecture Ikuno-machi, Ichino-gun, Inouno 985-1

Claims (3)

[Claims] 1. A build-up welding apparatus for build-up welding dissimilar materials to a valve head of a valve for an intake valve or an exhaust valve of an internal combustion engine, the valve head of a material valve to which build-up welding is applied. A welding torch for overlay welding; and a material valve holding means for holding the material valve at an angle so that the valve head of the material valve faces the welding torch, wherein the material valve holding means is a valve of the material valve. A base metal block having an end surface on the head side in contact with the base metal block, and cooling means for cooling the base metal block. A columnar portion is formed at an upper end of the base metal block, and a diameter of the columnar portion is in contact with the base metal block. The overlay welding apparatus is characterized in that the diameter is slightly larger than the diameter of the valve head of the valve. 2. The diameter of the columnar portion of the base metal block is 0.5 to more than the diameter of the valve head of the material valve with which the cylinder block abuts.
The overlay welding apparatus according to claim 1, wherein the overlay welding apparatus is formed to be large by 5.0 mm. 3. The overlay welding apparatus according to claim 2, wherein an upper surface of a cylindrical portion of the base metal block is flat.