JPH0321273B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for welding a chip member made of a hardenable material to an end face of a shaft portion of a valve member for an internal combustion engine.

[Conventional technology]

Exhaust valves for internal combustion engines operate at high temperatures, so high-alloy steel with high thermophilicity, ie, austenitic steel, is used as the material.

In overhead cam type engines,
When the rotation of the cam is transmitted to the valve member via the rocker arm, frictional action is repeated at the contact area between the end face of the shaft and the rocker arm, gradually causing trouble in opening and closing the valve.
Therefore, it is desirable that the end face of the shaft portion of the valve member be subjected to a wear-resistant treatment such as hardening.

However, if the valve member is made of austenitic steel as mentioned above, it does not have hardenability and the desired hardness cannot be obtained. Chip members made of steel are often welded.

1 and 2 show an example of a conventional chip welding device for this purpose.

The valve member 1 sent from a chute (not shown) is placed with the symbol A with its umbrella portion 1a facing up.
It is dropped into the supply position shown by and supported by a pair of front and rear support rods 2, 2.

The lower part of the shaft portion 1b of the valve member 1 is supported by a pair of right and left clamp members 3 and 4, and a tip member 6 is placed on a stand 5 below.

By integrally moving the slide shafts 7 and 8 of the clamp members 3 and 4 to the right, the valve member 1
is brought to the welding position indicated by B, and the tip member 6 is inserted into the recess of the lower electrode 9.

The end portion 1b of the valve member 1 passes through the notch 11a of the guide plate 11, reaches the center of the large diameter hole 11b, and the umbrella portion 1 is guided along the upper surface of the guide plate 11.
a falls from the large diameter hole 11b.

The shaft portion 1b of the valve member 1 is clamped by the upper electrode 12, and the lower electrode 9 is raised,
The tip member 6 contacts the lower end surface of the shaft portion 1b.

Next, while pressing the shaft portion 1b against the chip member 6 by the pressure member 13, current is applied to both electrodes 9 and 12, and the chip member 6 is welded.

After welding is completed, the lower electrode 9 is lowered, the valve member 1 is ejected to the left, the clamp member 3 is moved to the left and returned to the supply position A shown by the chain line, and the same process is performed for the next valve member 1. perform the work.

[Problem that the invention seeks to solve]

In the conventional chip welding device described above, 1
Every time we weld the main valve member 1, it is necessary to reciprocate the clamp members 3 and 4 and align the tip member 6 and the valve member 1, which reduces the efficiency of welding work. .

Further, since the clamp members 3 and 4 are located near the lower end of the shaft portion 1b of the valve member 1, the upper electrode 12 clamps the shaft portion 1b at a position away from the end of the shaft portion 1b. must, therefore,
There is a drawback that it takes time for the temperature of the shaft portion 1b to rise to a weldable state.

[Means for solving problems]

According to the present invention, the above-mentioned problem is solved by an apparatus for electrical resistance welding a chip member to the shaft end surface of a valve member for an internal combustion engine. It has a turntable that holds the member and rotates intermittently to four positions, the first position being a means for supplying the valve member to the holding part, and the second position being the means for supplying the valve member to the shaft end surface of the valve member. The mounting means is in the third position, the electric resistance welding means for welding the valve member and the chip member is in the fourth position, and the mounting means is in the third position.
The positions are each provided with means for discharging the valve member after welding is completed, the supply means is adapted to feed out the valve member in an upright state with its umbrella portion downward, and the mounting means is adapted to deliver the valve member in an upright state with the valve member facing downward. The welding means includes a device that feeds the member onto the shaft end surface of the valve member with the cap below, and the welding means includes a lower electrode mechanism that clamps the vicinity of the end of the shaft of the valve member with the cap below. and an upper electrode that presses a tip member placed on the shaft end surface of the valve member against the shaft end surface of the valve member, the ejection means comprising a device for removing the valve member from the holding portion, and further, Automatic welding of a chip member to a valve member for an internal combustion engine, characterized in that an indexing mechanism is provided in the drive section of the turntable so that each holding member can be stopped for a predetermined time at each position rotated by a required angle. Solved by the device.

〔Example〕

An embodiment of the present invention shown in FIG. 3 and subsequent figures will be described below.

In FIG. 5, four holding parts 22 are provided at equal intervals on the outer periphery of the turntable 21, and the turntable 21 is arranged at an angle of 90° from a first position _P1 to a fourth position _P4 . It is rotated counterclockwise intermittently.

In the first position _P1 , the means C for supplying the valve member 1 to the holding part 22 is in the second position P1.
At _P2 , the mounting means D for the tip member 6 on the shaft end surface 1c of the valve member 1 is in the third position _P3.
, there is an electric resistance welding means E between the valve member 1 and the tip member 6, and in the fourth position _P4 ,
A means F for preventing the valve member 1 from being ejected after welding is completed is provided.

That is, a chute mechanism 23 in the supply means C is disposed between the first and fourth positions P ₁ and P ₄ , and a loading mechanism 24 is disposed at the front left side thereof. Their details will be described later.

Further, in the second position _P2 , the shoot mechanism 23 of the chip member 6 in the mounting means D is in the third position.
A resistance welding mechanism 26, which is the welding means E, is disposed at the position _P3 , and a discharge mechanism 27, which is the discharge means F, is disposed at the fourth position _P4 . Their details will be described later.

A vertical shaft 28 having a turntable 21 at its upper end is supported by a housing 29 as shown in FIG. 6, and an index roller 31 is mounted on the shaft 28. As shown in FIG.

An index cam 33 is fixed to a drive shaft 32 provided within the housing 29 and driven by a drive source (not shown).

An index mechanism 34 is constituted by the index cam 33 and the index roller 31, and its action moves the turntable 21
is intermittently rotated in the direction of arrow 35 in FIG.

In FIG. 7, the umbrella portions 1a of the plurality of valve members 1 are hung on the guide member 36 of the chute mechanism 23 whose front end is inclined downward.

The first and second valve members 1 from the front are locked by stoppers 37 and 38, and by alternately protruding and retracting the stoppers 37 and 38, the valve members 1 are sequentially activated by the chute mechanism. Sent out from 23.

A turning mechanism 39 is provided at the outlet portion of the front end of the chute mechanism 23 . The lower end of the support lever 41 constituting the rotation mechanism 39 is fixed to a shaft 42 connected to a drive source (not shown), and upper and lower arm portions 41a, 41b that protrude backward from the support lever 41 are connected to a shoot. It is adapted to hold the valve member 1 ejected from the mechanism 23.

When the support lever 41 rotates forward and becomes horizontal, the valve member 1 becomes horizontal.

A loading mechanism 24 shown in FIG. 8 moves forward and backward from the side of the valve member 1 which is in a horizontal state.

In FIG. 8, the tips of connecting rods 47 and 48 are pivoted to clamp levers 45 and 46 whose bases are pivoted to the tips of U-shaped brackets 44, respectively.
The rear end of each of the connecting rods 47, 48 is pivotally connected to a shaft 49 fixed to a piston 52 of a cylinder 51.

The slide plate 53 supporting the cylinder 51 and the bracket 44 is supported by a slide shaft 54 and a piston rod 55 fixed thereto.
It is slidably supported by a rotating plate 56.

Cylinder 57 with piston rod 55
is fixed to the free end of the rotating plate 56, and
The base of 6 is fixed to a shaft 59 of a motor 58.

In the loading mechanism 24 configured in this way, when the cylinders 51 and 57 are operated,
The clamp levers 45 and 46 open and move forward in the direction of arrow 61 to clamp the valve member 1 in the horizontal state.

Thereafter, the clamp levers 45 and 46 are moved backward to move the valve member 1 laterally.

In this state, by operating the motor 58 and rotating the clamp levers 45 and 46 by 90 degrees,
As shown in the third diagram, the valve member 1 is vertical with the umbrella portion 1a facing downward.

At this time, the valve member 1 faces the holding portion 22 in the first position _P1 shown in FIG.

The holding portion 22 consists of a guide stopper 62 shown in FIG. 9 and a clamper 63 shown in FIG. 10.

The guide stopper 62 is the turntable 21
is fixed to the upper surface of the
As shown in the figure, the shaft portion 1b of the valve member 1 is fitted.

As shown in FIG. 10, opening/closing plates 65, 66 are attached to the support plate 64 of the clamper 63 with bolts 67 equipped with compression springs 68, and the opening/closing plates 65, 66 are fixed to the free ends of the opening/closing plates 65, 66. pin 71,7
2 and the free end of the support plate 64, the valve member 1
The shaft portion 1b is held. That is, the shaft portion 1b
is pushed from the free end of the clamper 63, the opening/closing plates 65, 66 open and close against the compression spring 68,
The shaft portion 1b is fitted and held.

When the valve member 1 is held by the holding part 22 in the first position _P1 , as shown in FIG.
The turntable 21 rotates 90 degrees in the direction of arrow 35,
The valve member 1 stops at the second position _P2 , as shown in FIG.

FIG. 11 also shows a mounting device D for the chip member 6.

A plurality of tip members 6 are housed in the tip member shooting mechanism 25 and are biased in the direction of the arrow. When the cylinder 74 perpendicular to the tip members 6 is actuated and the piston 75 moves in the direction of the arrow, the tip members 6 is placed on the shaft end surface 1c of the shaft portion 1b of the valve member 1.

When the turntable 21 further rotates in this state, the tip member 6 is guided by the guide stopper 62 and the arcuate guide member 76, as shown in FIG. 12, and moves to the third position P3 _.
sent to.

FIG. 13 shows the electric welding mechanism 26 in the welding means E.

Shaft portion 1b of valve member 1 with umbrella portion 1a below
is clamped by a lower electrode mechanism 77 near its end.

By operating the cylinder 78 and moving the support base 79, the lower electrode mechanism 77 moves forward and backward with respect to the valve member 1.

FIG. 14 is a plan view of the lower electrode mechanism 77.
The middle part of the pair of lower electrodes 81 is connected to the support base 7 by a shaft 82.
9, and the base of each lower electrode 81 is
Each is connected to a piston 86 of a cylinder 85 via links 83 and 84, respectively.

Due to the operation of the cylinder 85, the lower electrode mechanism 77 clamps the shaft portion 1b.

In this state, when the lower large-diameter cylinder 87 operates, its piston 88 pushes up the valve member 1, and the shaft end 1c and the tip member 6 are inserted into the recess 92 of the upper electrode 91.

The lower end of a piston rod 94 is attached to the support member 93 that pivotally supports the upper electrode 91, and the piston 96 of the small diameter cylinder 95 for pressurizing and the large diameter cylinder 97 for pressurizing during melting are attached to the piston rod 94. A piston 98 is connected.

When the small-diameter pressure cylinder 95 operates and lightly presses the tip member 6, and the tip member 6 and the shaft end face melt, the large-diameter cylinder 97 for pressure during melting is activated.
is operated to weld the tip member 6 to the shaft end surface of the valve member 1 (FIG. 4).

The valve member 1 that has been welded is sent to the discharge mechanism 27 by the rotation of the turntable 21.

As shown in FIG. 15, the discharge mechanism 27 includes a discharge cylinder 101 and a discharge chute 102 disposed below the turntable 21.
When the piston 103 of the discharge cylinder 101 protrudes and its free end 104 presses the side surface of the umbrella part 1a, the valve member 1 is released from the holding part 22,
It is discharged onto the discharge chute 102.

In this way, the valve member 1 to which the tip member 6 is welded is hardened and the tip member 6 at its shaft end is provided with wear resistance.

〔Effect of the invention〕

According to the present invention, the valve member is bonded to the circumferential surface of the turntable with the shaft end face of the valve member facing upward, and the loading, welding, and ejecting operations of the chip member are automatically performed in each position. The chip member can be efficiently welded to the member in a short time.

Further, since the valve member is clamped by the lower electrode near the shaft end, the temperature of the shaft rises within a short period of time, and the tip member can be quickly welded.

[Brief explanation of drawings]

FIG. 1 is a plan view conceptually showing a conventional chip welding device, FIG. 2 is a vertical sectional front view, and FIG. 3 is a front view of a valve member for an internal combustion engine before welding by the device of the present invention. 4 is a front view after welding, FIG. 5 is a plan view showing an embodiment of the device of the present invention, FIG. 6 is a longitudinal sectional front view, and FIG. 7 is a front view after welding.
The figure is a front view of the valve member shoot mechanism, FIG. 8 is a longitudinal sectional front view of the loading mechanism, and FIG.
A plan view of the guide stopper, FIG. 10 is a cross-sectional plan view of the clamper, FIG. 11 is a partial cross-sectional plan view of the tip member shoot mechanism, FIG. 12 is a side view, and FIG. 13 is an electrode welding FIG. 14 is a partially cross-sectional plan view of the lower electrode mechanism, and FIG. 15 is a vertical cross-sectional side view of the discharge mechanism. DESCRIPTION OF SYMBOLS 1... Valve member, 1a... Umbrella part, 1b... Shaft part, 1c... Shaft end surface, 2... Support rod, 3, 4...
Clamp member, 5...stand, 6...chip member,
7, 8...Slide shaft, 9...Lower electrode, 11...
...Guide plate, 11a...notch, 11b...hole,
12... Upper electrode, 13... Pressing member, 21...
Turntable, 22... Holding section, 23... Shoot mechanism, 24... Loading mechanism, 25...
Chip member shoot mechanism, 26... Electrode welding mechanism, 27... Discharge mechanism, 28... Shaft, 29... Housing, 31... Index roller, 32
...Drive shaft, 33... Index scum, 34...
Index mechanism, 35...Arrow, 36...Guide member, 37, 38...Stopper, 39...Turning mechanism, 41...Support lever, 41a, 41b...
... Arm part, 44 ... Bracket, 45, 46 ... Clamp lever, 47, 48 ... Link, 49 ...
Shaft, 51... Cylinder, 52... Piston, 5
3...Slide plate, 54...Slide shaft, 55...
... Piston rod, 56 ... Rotating plate, 57 ... Cylinder, 58 ... Motor, 59 ... Shaft, 61
...Arrow, 62...Guide stopper, 63...
Clamper, 64... Support plate, 65, 66... Opening/closing plate, 67... Bolt, 68... Compression spring, 74
... Cylinder, 75 ... Piston, 76 ... Guide member, 77 ... Lower electrode mechanism, 78 ... Cylinder, 79 ... Support stand, 81 ... Lower electrode, 8
2... Shaft, 83, 84... Link, 85... Cylinder, 86... Piston, 87... Large diameter cylinder, 88... Piston, 91... Upper electrode, 9
2... Recessed hole, 93... Support member, 94... Piston rod, 95... Small diameter cylinder for pressurization, 96
... Piston, 97 ... Large diameter cylinder for pressurizing during melting, 98 ... Piston, 101 ... Discharge cylinder, 102 ... Discharge chute, 103 ... Piston, C ... Supply means, D ... Placement means, E...
Welding means, F... discharge means.

Claims (1)

[Scope of Claims] 1. An apparatus for electrical resistance welding a chip member to the shaft end face of a valve member for an internal combustion engine, the valve member being held with the shaft end face facing upward by at least four holding parts on the peripheral surface. and has a turntable that rotates intermittently to four positions,
In the first position, the means for supplying the valve member to the holding part is in the second position, and in the second position, the means for placing the tip member on the shaft end surface of the valve member is in the third position.
The position is provided with electric resistance welding means for welding the valve member and the tip member, and the fourth position is provided with means for discharging the valve member after welding is completed. The tip member is fed out in an upright state with the part facing downward, and the placing means comprises a device for feeding the tip member onto the shaft end surface of the valve member with the umbrella part facing downward, and the welding means includes: A lower electrode mechanism that clamps the vicinity of the end of the shaft portion of the valve member with the umbrella portion facing downward, and an upper electrode that presses the tip member placed on the shaft end surface of the valve member against the shaft end surface of the valve member. The discharging means comprises a device for removing the valve member from the holding part, and further includes an indexing mechanism of the turntable that can be stopped for a predetermined time at each position where each holding member is rotated by a required angle. An automatic welding device for a chip member for a valve member for an internal combustion engine, characterized in that it is provided in a drive section. 2. A patent claim characterized in that the supply means includes a chute mechanism that suspends the valve member with its umbrella portion facing upward, and a turning mechanism that brings the valve member sent out from the chute mechanism into a horizontal state. An automatic welding device for a chip member in a valve member for an internal combustion engine according to item 1. 3. The supply means grasps the shaft portion of the valve member in a horizontal state and rotates it by 90 degrees, thereby transporting the valve member to the first position of the turntable with the umbrella portion of the valve member facing down; 3. An automatic welding device for a chip member for a valve member for an internal combustion engine according to claim 1 or 2, further comprising a device for supplying the tip member to the holding portion. 4. The placing means includes a tip member shooting mechanism located on the outer periphery of the second position of the turntable, thereby placing the tip member on the shaft end surface of the valve member. An automatic welding device for a chip member for a valve member for an internal combustion engine according to any one of claims 1 to 3. 5. The welding means includes a lower electrode mechanism that clamps the shaft portion of the valve member and energizes it, an upper electrode mechanism that pressurizes the tip member and energizes it, and a large diameter cylinder that pressurizes the lower part of the valve member. Claims 1 to 4 include a pressurizing small diameter cylinder disposed above the upper electrode and a medium diameter cylinder for pressurizing during melting.
An automatic welding device for a chip member for a valve member for an internal combustion engine according to any one of Items 1 to 9. 6. A patent claim characterized in that the ejection means includes an ejection cylinder and an ejection chute disposed below the turntable in the fourth position, thereby ejecting the valve member that has undergone chip welding. An automatic welding device for a chip member for an internal combustion engine valve member according to any one of items 1 to 5.