JPH07241671A - Cladding by welding equipment - Google Patents

Abstract

PURPOSE:To surely keep the attachment/detachment workability of a stock valve to/from a rotary table, and to improve the manufacturing efficiency of a valve by setting the stock valve where the oil/grease content at the bottom of the valve head is removed by a cleaning mechanism on the rotary table. CONSTITUTION:A cleaning member provided on a cleaning mechanism 80 is abutted on a valve head of a stock valve A, and rotated to remove the oil/ grease content adhered to the valve head. Cladding by welding is executed to the valve head of the stock valve A by a welding torch 25. The valve head of the stock valve A is held by a rotary table 38 opposite to the welding torch 25, and the valve head is rotated around its axis. The stock valve A at the waiting position is held by a transferring mechanism 60, and transferred so as to be abutted on the cleaning member, and the stock valve A is transferred to the rotary table 38. This constitution can prevent the adherence of the sputter or the like during the welding.

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. For this reason, as shown in FIG. 5, a material having high wear resistance (for example, Co—Cr—W—C alloy) is welded to the valve head 2 of the valve 1 formed through forging (see 3 in the figure). After that, the overlay welding portion is subjected to machining (for example, grinding) to obtain a desired shape.

In overlay welding on a valve head, a valve for overlay welding (hereinafter referred to as a material valve) is held on a rotary table at its end face on the valve head side, and the overlay is rotated while rotating the rotary table. Overlay welding is performed under the same welding conditions from the starting point of welding to a position where it is rotated 360 ° for one turn.

[0004]

By the way, in the conventional overlay welding, the demolding agent (oil) at the time of forging adhered to the end face of the material valve, especially the valve head, is transferred to the rotary table and is transferred onto the upper surface of the rotary table. In many cases, the demolding agent is integrated with spatter etc. generated during welding to sinter on the turntable to form a strong sintered layer, which may interfere with the work of attaching and detaching the valve to the turntable. There's a problem. In addition, it is possible to arrange a water cooling tube inside the rotary table to prevent the sintering, but
Since the demolding agent attached to the rotary table serves as a heat insulating layer to hinder the heat radiation of the rotary table, the cooling efficiency is lowered, and there is a problem that the sintering preventing effect cannot be sufficiently obtained. In view of the above problem, if the work of removing the demolding agent attached to the valve is carried out manually before welding the material valve, the production efficiency of the product valve will be reduced this time.

The present invention has been made in view of the above circumstances, and provides a build-up welding apparatus capable of automatically removing oil and fat components adhering to the end surface of a valve head to improve the production efficiency of a product valve. The purpose is to do.

[0006]

The present invention has the following features to attain the object mentioned above. That is, according to the overlay welding device of claim 1, when manufacturing a valve head of a valve for an intake valve or an exhaust valve of an internal combustion engine, a overlay for overlay welding different materials to the valve head of the material valve. A welding apparatus, which has a cleaning member that rotates in contact with the valve head of the material valve, the cleaning mechanism removing oil and fat components adhering to the valve head by the cleaning member, and the valve head. A welding torch for build-up welding, a rotary head for holding the valve head in opposition to the welding torch, and rotating the valve head about its axis, and a material valve at a standby position for gripping the valve. A means for solving the above-mentioned problems is provided with a transfer mechanism for transferring the material valve so as to be in contact with the cleaning member and for transferring the material valve onto the rotary table.

According to the overlay welding device of the second aspect, the cleaning mechanism includes a rotating body, a felt member that is attached to an end surface of the rotating body and constitutes the cleaning member, and the rotating body and the felt body. And a drive source for rotationally driving the.

[0008]

According to the overlay welding device of the first aspect, the material valve supplied to the standby position is gripped by the transfer mechanism, and the material valve is brought into contact with the cleaning member of the cleaning mechanism to adhere to the material valve. After removing the oil and fat components that have been removed, the material valve, from which the oil and fat components have been removed, is transferred to a rotary table for overlay welding.

According to the overlay welding device of the second aspect of the present invention, the oil and fat components adhering to the material valve are automatically removed only by bringing the material valve into contact with the felt by rotationally driving the rotor and the felt.

[0010]

DETAILED 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 FIGS.

As shown in FIGS. 1 and 2, the overlay welding apparatus according to the present embodiment includes a material valve supply mechanism 10 for storing a material valve A to be subjected to overlay welding, and a valve head for the material valve A. Welding mechanism 20 for overlay welding and a welding mechanism 2
A material valve holding mechanism 30 for holding the material valve A diagonally so that the valve head of the material valve A faces the welding torch 25 of 0 and rotating it about an axis.
The product valve stock mechanism 50 that stores the product valve B that has been welded by the welding mechanism 20 and the material valve A from the material valve supply mechanism 10 to the material valve holding mechanism 30 and the product valve B From the material valve holding mechanism 30 to the product valve stock mechanism 5
The valve transfer mechanism 60 that conveys the material valve A toward 0 and the valve head bottom surface of the material valve A during the transportation of the material valve A from the standby position 11 of the material valve supply mechanism 10 to the material valve holding mechanism 30 by the valve transfer mechanism 60. And a cleaning mechanism 80 for removing oil.

The material valve holding mechanism 30 is provided with a rotary table mechanism 31 with 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 provided obliquely upwardly spaced from the rotary table mechanism 31. Is pressed from above and the material valve A is pressed between the rotary table mechanism 31 and
And a valve mounting / positioning mechanism 33 for positioning and mounting the material valve A substantially coaxially with the rotary shaft of the rotary table mechanism 31.

In the valve transfer mechanism 60, the material valve supply mechanism 10 is centered on a point 62 on the fixed portion 61 side.
To the material valve holding mechanism 30, from the material valve holding mechanism 30 to the product valve stock mechanism 50, and further from the product valve stock mechanism 50 to the material valve supply mechanism 10. The moving arm mechanism 63, the rotating member 64 rotatably attached to the tip end side of the swinging arm mechanism 63, and the rotating member 64 at the outer peripheral portion of the rotating member 64 are attached at two positions sandwiching the rotating shaft. Two chuck mechanisms 6 that clamp the valve stem of the material valve A or the product valve B from the side surface.
5, 66 and.

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 mechanism 63 is connected to the upper part of the swivel base 67. The swing arm mechanism 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.

The chuck mechanisms 65 and 66 have two cylinders 69 arranged side by side in the rotating direction of the rotating member 64.
Each of the piston rods 69a of the cylinders 69 is constructed by attaching an abutting member that abuts the valve stem.

As shown in FIG. 2, the material valve supply mechanism 10 has one end at the supply source of the material valve A (not shown) and the other end at the grip standby position 11 by the transfer mechanism 60. A guide member 12 for guiding the supplied material valve A to the standby position 11, and this guide member 1
2, an alignment supply mechanism (for example, a parts feeder) 13 that aligns and conveys the material valves A provided one by one at a position slightly closer to the supply source than the standby position 11.
The standby position 11 is provided with a stationary mechanism (not shown) for stopping the material valve A supplied from the alignment supply mechanism 13 at the standby position 11. The guide member 12
Is a long strip-shaped member having a groove in the central portion in the width direction, and is provided so as to descend from the supply source toward the standby position 11, and the material valve A has the valve stem in the groove. When the valve head is hooked on the upper surface of the guide member 12, it slides down from the supply source toward the standby position 11 by its own weight by being inserted from above to below.

The welding mechanism 20 is provided with a guide column 21 standing upright in the vertical direction, a movable base 22 movably attached to the guide column 21 in the vertical direction, and a horizontal movement on the movable base 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 attached to the tip of the bracket 24 in the vertical direction, and a powder supply mechanism 2 shown in FIG. 1 for supplying the welding torch 25 with powdered welding material.
6 and. 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 mechanism 26 drops a welding material in the hopper 26a, which stores the powdered welding material, and a rotating roller 26b, which is knurled, to rotate the rotating roller 26b. Welding torch 25 with powder accumulated on the knurled surface by argon gas flow
A pressure feeding pipe 26c for feeding pressure to the hopper 26a and a weight measuring mechanism (for example, a load cell) (not shown) for measuring the weight of the hopper 26a and adjusting the supply amount of the welding material to an appropriate amount. In this weight measuring mechanism, the total weight of the weight of the hopper 26a itself and the stored welding material is measured, 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. The rotation speed of the knurled rotary roller 26b is adjusted as compared with the reference value, and the amount of welding material pumped by this is adjusted.

The rotary table mechanism 31 includes a swing block 37 rotatably held by the guide column 21 by a support portion 37a (see FIG. 1), and a rotary table rotatably attached to the swing block 37. 38 and this turntable 3
A cooling pipe (shaft member) 47 that rotatably supports 8 through a bearing (not shown), and a motor 39 that is fixed to the swing block 37 and has its rotation shaft connected to a rotary base 38 via a belt (not shown). Is equipped with.

As shown in FIG. 3, the rotary table 38 is attached in a rotatable manner with respect to the cooling pipe 47 while maintaining a hermetically sealed state so that powdery welding material cannot enter the periphery of the cooling pipe 47. Box frame 44 and this box frame 4
4 and a base metal block 45 fixed to the upper part of 4. The box-shaped frame 44 is provided with two grounding mechanisms 48 that extend in the radial direction and ground the cooling pipe 47 without a bearing 46.

As shown in FIG. 1, the valve attaching / detaching mechanism 3 is provided.
Reference numeral 2 denotes an advancing / retreating block 42 which is arranged coaxially with the rotary table 38 and has a groove (not shown) formed at the center thereof into which a valve stem is inserted; And a cylinder 43 for moving back and forth.

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

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

As shown in FIG. 4, the cleaning mechanism 80 includes a disk-shaped rotating body 81, a felt 82 which is attached to the upper surface of the rotating body 81 and constitutes the cleaning member, and these rotating bodies. 81 and a drive source 83 that rotationally drives the felt 82. The drive source 83 is an electric motor, and is contained and fixed in a housing 84 that is erected adjacent to the side of the fixing portion 61 (see FIG. 1). The rotating body 81 has a rotating shaft 85 of the drive source 83 horizontally fixed to a tip of the rotating body 85 protruding above the upper surface of the housing 84.

Next, the operation of the overlay welding apparatus of this embodiment will be described. First of all, the shape of the valve used for overlay welding,
A material, a material to be built up 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. By this operation program, for example, the operation of the valve transfer mechanism 60 (for example, the gripping position by the chuck mechanisms 65 and 66, the supply position to the material valve holding mechanism 30, the discharge position to the product stock mechanism 50, and the waiting time between each operation) , Sampling timing, sampling number, etc.), welding conditions such as the position of the welding torch 25 of the welding mechanism 20 and plasma gas conditions, powder supply conditions by the powder supply mechanism 26, rotation of the material valve A by the material valve holding mechanism 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. It can be done automatically.

That is, as shown by the chain double-dashed line in FIG.
While swinging to the 0 side, the swing arm mechanism 63 is swung about one point 62, and the swing arm mechanism 6
By rotating the rotating member 64 attached to the tip of 3,
The chuck mechanism 65 is also oriented toward the material valve supply mechanism 10 side. Then, the alignment supply mechanism 13 is operated to sequentially align and supply the material valves A, and at the same time, the material valve A is supplied and stopped at the standby position 11 by the action of the stationary mechanism.
The valve stem of (1) is clamped and held from the side by the chuck mechanism 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, the swivel base 67 is swung by about 90 degrees to face the cleaning mechanism 80, and the rotary member 64 is moved to 1
After rotating the material valve A upside down by rotating 80 degrees and swinging the swing arm mechanism 63 toward the cleaning mechanism 80 side, the valve head bottom surface of the material valve A is attached to the upper surface of the felt 82 which is rotationally driven. A) to remove the oil and fat component adhering to the bottom surface of the valve head.

Next, as shown by the solid line in FIG. 1, the swivel base 67 is swung to the side of the material valve holding mechanism 30, and the swing arm mechanism 63 is similarly moved to the material valve holding mechanism 3.
Swing toward the 0 side.

Next, the material valve A sandwiched by the chuck mechanism 65 is positioned between the base metal block 45 and the advancing / retreating block 42 shown in FIG. 3 of the rotary table 38 of the material valve holding mechanism 30.

Next, the cylinder 43 is extended to drive 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 a groove (not shown) formed in the center of the advancing / retreating block 42, and the material valve A is pressed and held between the bottom of the groove and the rotary table 38. When the holding of the material valve A is completed, the valve mounting positioning mechanism 33 is retracted, and then the motor 39 is rotationally driven to rotate the material valve A integrally with the rotary table 38.

Material valve holding mechanism 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 mechanism 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 welding material to the welding torch 25, and the welding material is melted by the welding torch 25 while jetting the welding material, and the valve of the material valve A is used. Eject toward the head.

Here, the welding torch 25 side is set to a high voltage, and the material valve A side is grounded so that current flows from the welding torch 25 side toward the material valve A side. The weld material melted by the above is sprayed toward the valve head of the material valve A, and good overlay welding can be performed. In this embodiment, since the grounding mechanism 48 is provided, the above-described current flow can be generated, and good overlay welding can be performed. Further, since the material valve A is obliquely supported and rotated by the material valve holding mechanism 30, the welding material does not flow out 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.

Since the demolding agent on the bottom surface of the valve head of the material valve A is removed by the cleaning mechanism 80, the demolding agent does not adhere to the upper surface of the base metal block 45 during build-up welding, and the base metal block 45. The close contact between the material valve A set on the upper surface and the upper surface of the base metal block 45 is ensured, and the spatter generated during welding is prevented from adhering to the upper surface of the base metal block 45. Also, during this overlay welding,
Since the base metal block 45 is cooled by supplying the cooling water into the cooling pipe 47 and refluxing it, the base metal block 45 is prevented from being heated to a high temperature by the heat during welding.
It is possible to prevent sintering on the upper surface of the base metal block 45, such as sputtering, and to prevent formation of a heat insulating layer.

On the other hand, while the overlay welding is being performed by the welding torch 25, the material valve A for the overlay welding is conveyed from the material valve supply mechanism 10 to the material valve holding mechanism 30 in the vicinity thereof. come. That is, after the material valve A is positioned by the valve attachment positioning mechanism 33, the material valve A is released from the holding state, so that the swing arm mechanism 63 swings, the swivel base 67 swings, and the rotary member 64 rotates. The rotary member 6 of the valve transfer mechanism 60
The chuck mechanism 66 attached to the No. 4 is made to face the material valve A of the material valve supply mechanism 10,
Thus, the material valve A is clamped, and the swivel 67, the swing arm member 63, etc. are returned. At this time, the material valve A clamped by the chuck mechanism 66 is moved to the material valve holding mechanism 30.
On the other hand, the rotary shaft of the rotating member 64 is sandwiched between the chucks 65, and the chuck mechanism 65 not sandwiching the material valve A is located at the position facing the material valve A being welded.

Next, when the overlay welding is completed, the motor 39
To stop the rotation of the turntable 38. Then, the swing arm mechanism 63 is moved in a direction in which the swing arm mechanism 63 is slightly closer to the product valve B on which the overlay welding has been performed, and the rotating member 64 is moved.
The chuck mechanism 65, which is not attached to the material valve, is moved toward the product valve B, and the chuck mechanism 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 mechanism 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 mechanism 65 moves to a position sandwiching the rotary member 64 and the chuck mechanism 6
The material valve A sandwiched by 6 is located between the rotary table 38 and the advancing / retreating block 42.

After releasing the holding of the product valve B by the material valve holding mechanism 30, the product valve B is conveyed to the product valve stock mechanism 50.

Next, after releasing the product valve B, the swing arm mechanism 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 mechanism 63 is performed. The material valve A is sandwiched by the chuck mechanism 65 provided on the rotating member 64 so that the member 64 is directed toward the material valve supply mechanism 10 and the swing and swivel base 67 of the swing arm mechanism 63 is held. The material valve A is first conveyed to the cleaning mechanism 80 to remove oil and fat components, and then conveyed to the material valve holding mechanism 30. After this, by repeating the above operation again,
Overlay welding can be continuously performed on the valve head of the material valve A.

In the overlay welding apparatus of this embodiment, since the material valve A from which the oil and fat components adhering to the valve head bottom surface are removed by the cleaning mechanism 80 is installed on the base metal block 45, the top surface of the base metal block 45 is It is possible to prevent the metal block 45 from being polluted with oil, maintain the heat radiation of the metal block 45, and prevent the spatter and the like from adhering at the time of welding. Therefore, the manufacturing efficiency of the product valve is improved.

Further, since the cleaning mechanism 80 has a structure in which the felt 82 constituting the cleaning member adhered to the rotating body 81 is rotationally driven by the drive source 83, the material valve A is attached to the rotationally driven felt 82. The oil and fat components adhering to the material valve A can be automatically removed just by contacting them, and the work time for removing the oil and fat components is greatly shortened.
The manufacturing efficiency of the product valve B can be further improved.

[0042]

As described above, according to the overlay welding apparatus of the first aspect, the material valve from which the oil and fat components attached to the bottom surface of the valve head have been removed by the cleaning mechanism is installed on the rotary table. The upper surface of the rotary table is not polluted with oil, the heat radiation of the rotary table is maintained, and the adhesion of spatter etc. during welding can be prevented, and the workability of attaching / detaching the material valve to / from the rotary table is reliably maintained. Therefore, the valve manufacturing efficiency is improved.

According to the overlay welding device of the second aspect, since the cleaning mechanism is configured to rotate the felt constituting the cleaning member adhered to the rotating body by the drive source, the felt driven to rotate is rotated. The oil and fat components adhering to the material valve can be automatically removed simply by abutting the material valve on, and the work time for removing the oil and fat components can be greatly shortened, further improving the valve manufacturing efficiency. You can

[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 side view showing a turntable in FIG.

4 is a side view showing the cleaning mechanism in FIG. 1. FIG.

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

[Explanation of symbols]

 1 Valve 2 Valve Head 3 Overlay Welding Part 25 Welding Torch 38 Turntable 60 Transfer Mechanism 80 Cleaning Mechanism 81 Rotating Body 82 Felt 83 Drive Source A Material Valve

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location B23K 37/00 A (72) Inventor Yoshio Chiba 1230 Kamihidani, Okegawa, Saitama Mitsubishi Material Stock Okegawa Manufacturing Company

Claims (2)

[Claims] 1. A build-up welding apparatus for build-up welding dissimilar materials to a valve head of a raw material valve when manufacturing a valve head of a valve for an intake valve or an exhaust valve of an internal combustion engine, the raw material valve A cleaning mechanism that has a cleaning member that rotates in contact with the valve head, the cleaning mechanism removing oil and fat components adhering to the valve head by the cleaning member, and a welding torch for overlay welding the valve head, A rotary table that holds the valve head facing the welding torch and rotates the valve head about its axis, and a material valve in a standby position, and grips the material valve against the cleaning member. And a transfer mechanism for transferring the material valve onto the rotary table. 2. The overlay welding apparatus according to claim 1,
The cleaning mechanism includes a rotating body, a felt that is attached to an end surface of the rotating body and that constitutes the cleaning member, and a drive source that rotationally drives the rotating body and the felt. Welding equipment.