KR102295719B1 - Gripper for welding needle and ball of needle assembly for automobile injector nozzle - Google Patents

Abstract

The present invention provides a chuck processing method for welding a needle and a ball of a needle assembly for an automobile injector nozzle that processes the tip of the chuck so that the needle can be moved simultaneously with stable chucking of a small-diameter needle, a chuck manufactured by this method, and The present invention relates to a gripper including the chuck, comprising: uniformly plane-processing the tips of a plurality of chucks (S10); forming a grinding space between the chucks facing each other by radially coupling the plurality of chucks to each moving member of the gripper, and moving the coupled chucks in the needle chucking direction (S20); and a step (S30) of grinding the front end plane of the chucks into a curvature part so that a curvature for chucking the needles can be formed with the front ends of the chucks facing each other by entering a jig grinder smaller than the diameter of the needle into the grinding space. to be processed

Description

Gripper for welding needle and ball of needle assembly for automobile injector nozzle

The present invention relates to a chuck processing method, and more particularly, a chuck for welding a needle and a ball of a needle assembly for an automobile injector nozzle that processes the tip of a chuck so that a needle with a small diameter can be stably chucked and moved at the same time. It relates to a processing method, a chuck manufactured by the method, and a gripper including the chuck.

In an automobile engine, an injector is installed that atomizes fuel and injects it at high speed so that the fuel can be smoothly mixed with air sucked into the combustion chamber and combusted.

The injector is electronically controlled by the engine control unit (ECU), which uses various sensors such as an air flow meter, intake air temperature sensor, throttle position sensor, coolant temperature sensor, crank angle sensor, and oxygen sensor. Receive information such as intake air quantity, intake air temperature, throttle opening, coolant temperature, engine speed, oxygen concentration in exhaust gas, etc. (Duration) control.

Such an injector is provided with a needle assembly that allows fuel introduced into the housing to be injected through a fuel passage hole formed at the end of the housing, and the needle assembly is composed of a needle having a predetermined length and a spherical ball, and the ball is a needle. welded to the end of

The ball is in close contact with or spaced apart from the surface of the valve seat according to the movement of the needle, thereby controlling the fuel injected through the fuel passage hole.

At this time, the ball should be welded to the exact center of the tip of the needle so that it coincides with the longitudinal center of the needle, but if in-place welding with the needle is not made, the contact with the valve seat part through the ball deteriorates, so it is difficult to control fuel. will cause problems

In welding the needle and the ball, first, the ball is seated at the tip of the needle while the needle is supported by a dedicated gripper, the needle is lowered to the welding point where welding is performed, and the needle and the ball are welded at the welding point.

At this time, the needle is supported by a plurality of chucks 1 installed in the gripper as shown in FIG. 1 , and the tip of the chuck 1 supporting the needle is formed in a flat surface.

However, in the chucking method of the needle as shown in FIG. 1 , since a plurality of chucks are in point contact with the needle, the pressure is inevitably concentrated strongly on the contact portion, so that it is difficult to lower the needle for welding. If the needle is forcibly lowered, bending occurs and the needle is damaged.

In addition, if the machining of the tip of each chuck is not uniform, the center of the chucked gripper may be eccentric in any one direction, so that when the needle and the ball are welded, a fatal problem occurs in that the ball is eccentrically welded to the needle.

If an operator can directly process the chuck tip into a curved surface for in-place chucking and movement of the needle, however, if the needle diameter is relatively large, it is easy to machine an arbitrary curved surface on the chuck tip, but if the diameter of the needle is If it is small, for example, about 2Φ (used for injectors), it is fundamentally impossible to process a uniformly arbitrary curved surface at the tip of each chuck.

Domestic Patent Publication No. 10-2019-0124363 Domestic Registered Patent No. 10-1836775

The present invention has been devised to solve the above problems and technical biases, and it is possible to prevent eccentricity of a needle during chucking of a needle with a small diameter and process a curvature at the tip of the chuck so that stable movement can be achieved in the chucked state. An object of the present invention is to provide a chuck processing method for welding a needle and a ball of a needle assembly for an automobile injector nozzle, a chuck manufactured by the method, and a gripper including the chuck.

A chuck processing method for welding a needle and a ball of a needle assembly for an automobile injector nozzle of the present invention for achieving the above object, a chuck manufactured by the method, and a gripper including the chuck are provided, flat processing (S10); forming a grinding space between the chucks facing each other by radially coupling the plurality of chucks to each moving member of the gripper, and moving the coupled chucks in the needle chucking direction (S20); and a step (S30) of grinding the front end plane of the chucks into a curvature part so that a curvature for chucking the needles can be formed with the front ends of the chucks facing each other by entering a jig grinder smaller than the diameter of the needle into the grinding space. to be processed

In this case, it is preferable that the jig grinder grinds the front end plane of the chucks with a curvature part while rotating in the grinding space and moving along a curvature trajectory according to the diameter of the needle.

In addition, the step S30 is preferably a step of grinding with a curvature of a diameter greater than 0.005 Φ to 0.01 Φ than the diameter of the needle.

In addition, it is preferable to provide a gripper with a stopper that allows the chucks to move only by a set distance in the radial direction.

In addition, it is preferable to perform grinding while supplying air to the moving member to prevent the chuck from being pushed when grinding the curved end portions of the chucks using the jig grinder.

In addition, a plurality of grippers are radially arranged on the main body, and a chuck having a curved portion contacting the outer peripheral surface of the needle for chucking the needle is formed at the distal end of the gripper; a plurality of moving members coupled to the chuck and configured to move the chuck by air supply; and a stopper for controlling a movement distance of the air chuck interlocked when the moving member moves, and an elevating member receiving elastic support from the inside and lifting and lowering the needle while accommodating one side of the needle is disposed.

Finally, it is preferable that the curvature portion is formed intermittently while having a predetermined width.

According to the method for manufacturing a chuck for welding a needle and a ball of a needle assembly for an injector nozzle according to the present invention having the above configuration and a gripper including the chuck, the plurality of chucks installed in the gripper are moved in the facing direction By entering the jig grinder and grinding the curvature at the tip of each chuck while the jig grinder draws a trajectory of the set diameter, it is possible to manufacture a dedicated gripper that allows each curvature of the grinded chuck to stably support only small-diameter needles, By preventing eccentric welding of the ball welded to the needle and at the same time making surface contact with a fine gap between the needle and the chuck, the pressure is distributed through the contact area with the outer peripheral surface of the needle, so that the chucked needle descends stably. It has an excellent effect to make it happen.

1 is a reference view showing a chuck of a conventional gripper,
2 is a sectional view of a main part of a gripper to which the chuck of the present invention is applied;
3 is a cross-sectional view showing a state in which the needle chucked in the chuck is lowered to the welding point;
4 and 5 are main plan views showing a state in which the chuck installed in the gripper of FIG. 2 chucks the needle;
6 and 7 are process diagrams showing the process of machining a curved part at the tip of the chuck,
8 is a flowchart showing a chuck processing method of the gripper.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. These embodiments are provided to explain the present invention in more detail to those of ordinary skill in the art to which the present invention pertains. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer description.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Fig. 2 is a major cross-sectional view of a gripper to which the chuck of the present invention is applied, Fig. 3 is a main cross-sectional view showing a state in which the needle chucked on the chuck is lowered to the welding point, and Figs. 4 and 5 are the chuck needle installed in the gripper of Fig. 2 It is a plan view showing a state of chucking, FIGS. 6 and 7 are process diagrams showing a process of machining a curved part at the tip of the chuck, and FIG. 8 is a flowchart showing a chuck processing method of the gripper.

As shown in FIGS. 2 to 8 , the chuck 120 processing method installed in the gripper 100 of the present invention includes the steps of uniformly flat processing the front ends of the plurality of chucks 120 ( S10 ); The plurality of chucks 120 are radially coupled to each moving member 130 of the gripper 100, and the coupled plurality of chucks 120 are moved in the needle (N) chucking direction between the facing chucks 120. forming a grinding space (A) (S20); and a jig grinder (G) smaller than the diameter of the needle (N) enters the grinding space (A) to form a curvature for chucking the needle (N) with the front ends of the chucks (120) facing each other. (S30) grinding the front end plane of the (120) to the curvature portion 121; is processed, including.

Prior to the description, the chuck 120 processing method of the present invention processes the curvature portion 121 at the tip of the chuck 120 in a state in which the chucks 120 are moved in the chucking direction, thereby forming a needle assembly for an automobile injector nozzle. When chucking a needle (N) with a small diameter, pressure distribution is induced through surface contact between the needle (N) and the curved part (121), so that the needle (N) for welding together with chucking of the needle (N) is stably descended. It has the biggest characteristic to make it happen.

The plurality of chucks 120 whose ends are machined through the processing method of the present invention are installed on the uppermost side of the gripper 100 as shown in FIGS. 2 and 3 .

The chuck 120 is to chuck the needle (N) to weld the ball (B) to the upper end of the needle (N), so that the welding of the ball (B) is not eccentric.

In addition, the chuck 120 allows the needle (N) to descend in the downward direction in the drawing as shown in FIG. 3 by the pressing force applied to the ball (B) seated on the top of the chucked needle (N).

This is to lower the contact area to the welding point (dotted-dotted line) so that welding can be made to the area where the ball (B) and the needle (N) are in contact, and at this time, the needle (N) is in surface contact with the chuck 120 It descends without flow while holding it.

Hereinafter, the structure of the gripper 100 including the chuck 120 will be described.

The gripper 100 includes a main body 110 , a chuck 120 , a moving member 130 , and a stopper 140 .

The main body 110 enables movement of the installed structures together with the installation of the structures such as the chuck 120 , the moving member 130 , and the stopper 140 .

A plurality of chucks 120 may be radially arranged on the uppermost side of the main body 110 as shown in FIGS. 3 and 4, and a small diameter needle N (N) ( For example, a curvature portion 121 in contact with the outer peripheral surface of the needle (N) is formed in order to chuck 2Φ.

At this time, the curvature portion 121 formed at the tip of the chuck 120 is intermittently configured while having a predetermined width in the downward direction as shown in FIGS. 2 and 3, which is a three-point point in the longitudinal direction of the needle (N). By minimizing the contact area with the outer peripheral surface of the needle (N) at the same time as making surface contact for pressure distribution in the needle (N), this is to ensure stable descent without flow in the chucked state of the needle (N).

In this embodiment, although it is illustrated that three curved portions 121 are formed, the number is not limited because the number may vary depending on the length of the needle (N).

In addition, the curvature portion 121 of the chucks 120 may be formed with a curvature of 0.005 Φ to 0.01 Φ larger than the diameter of the needle N to be chucked. This is, for example, if the diameter of the needle (N) is 2Φ, the size of the virtual diameter formed by the combination of the curvature parts 121 is formed within the range of 2.005Φ to 2.01Φ.

In this case, a gap (T) is formed between the needle (N) and the curvature portion 121 as shown in the enlarged view of FIG. 5 when the plurality of chucks 120 chuck the needle (N). However, since this gap T is extremely small, the chucking state of the needle N is not affected.

Precisely, while allowing the needle N to maintain the chucked state by the curvature portions 121 of the chuck 120 , a minute gap T between the needle N and the curvature portion 121 is By being present, the descent of the needle (N) for welding as shown in FIG. 3 can be made stably without flow.

Therefore, as the needle (N) is prevented from moving when descending with maintaining the center position by the chucks (120), the eccentric welding of the ball (B) welded to the needle (N) is fundamentally blocked.

If the curvature of the curvature portion 121 of the chuck 120 is formed to be less than 0.005Φ, the gap T between the outer circumferential surface of the needle N and the curvature portion 121 is too small, so that the needle N is smoothly descended. On the contrary, if the curvature of the curved portion 121 is formed to be 0.01 Φ or more, the gap T between the outer peripheral surface of the needle N and the curved portion 121 is too large, (N) is eccentric.

On the other hand, inside the chuck 120, as shown in Figs. 2 to 5, the stopper 122 is formed so that the movement distance is limited by the stopper 140 so that the movement of the chuck 120 can only move by a set distance in the radial direction. has been

A plurality of movable members 130 are arranged radially so as to be coupled to each chuck 120 upward, and are moved by air supply supplied through an air supply device (not shown) to face the chuck 120 while moving. It moves in conjunction with the chucking direction.

The stopper 140 limits the movement distance of the chuck that interlocks when the moving member is moved, is disposed at the inner center of the main body 110 as shown in FIGS. 2 and 3, and has a predetermined length. 141) and a circular engaging portion 142 extending from the upper side of the cylindrical portion 141 in the form of a flange and in contact with the engaging projection 122 of the chuck 120 moving.

Inside the longitudinal direction of the cylindrical portion 141, receiving elastic support by a spring disposed on the lower side, as shown in FIG. 3, a lifting member 143 that lifts and lowers in a state that accommodates one side (lower side) of the needle N is disposed. .

Elevation of the lifting member 143 allows the needle (N) to be lowered for welding the needle (N) and the ball (B).

Therefore, the circular locking jaw 122 of the stopper 140 makes the radial movement distance of the chucks 120 interlocking together when the radially formed moving member 130 moves, and at the same time, welding is performed. Guide the lifting member 143 so that the lowering of the needle (N) for stably made.

Hereinafter, a method of processing the tip of the chuck 120 of the gripper 100 will be described with reference to the accompanying drawings.

First, looking at the step (S10) of uniformly flat machining the tips of the plurality of chucks 120,

Before being installed in the gripper 100, the tip of each chuck 120 is individually ground in a plane as shown in FIG. 6 using a separate grinding grinder (not shown).

At this time, the length of the chuck 120 has a length that is included inside the virtual diameter D indicated by the dashed-dotted line when the tip of the plurality of chucks 120 is moved to the chucking position as shown in FIG. 6 in the ground plane position. desirable.

This is because the planar area of the tip of each chuck 120 included inside the imaginary diameter D trajectory is ground into the curvature portion 121 by a jig grinder G, which will be described later.

Here, the position of the front end plane of the chuck 120 does not necessarily have to be disposed at the same position inside the virtual diameter D, and the end portion forming the plane may be located only inside the virtual diameter D.

Next, the plurality of chucks 120 are radially coupled to each moving member 130 of the gripper 100 , and the coupled plurality of chucks 120 are moved in the needle (N) chucking direction to face the chucks 120 . ) of forming a grinding space (A) between the steps (S20),

First, a plurality of chucks 120 ground at the front end in a plane are coupled to the upper side of the plurality of moving members 130 arranged in a radial direction using a bolt (B) or the like.

In addition, a stopper 140 is installed in the center of the gripper body so that the chuck 120 can move only by a set distance when the chuck 120 is moved in the radial direction by the moving member 130 .

Thereafter, air is supplied to the moving member 130 to move the plurality of radially arranged chucks 120 to the chucking position as shown in FIG. 6 .

At this time, the chuck 120 is moved by the moving member 130, as shown in FIG. 3, the locking jaw 122 formed on the chuck 120 comes into contact with the locking part 142 of the stopper 140, so that FIG. They move together by the set distance.

That is, the movement of the plurality of chucks 120 is made uniformly by the stopper 142 of the stopper 140 .

In this case, a grinding space (A) into which the jig grinder (G) can enter is formed at the front end facing by the movement of the chucks ( 120 ) as shown in FIG. 6 .

At this time, of course, the formed grinding space (A) is smaller than the virtual diameter (D).

Finally, a jig grinder (G) smaller than the diameter of the needle (N) is introduced into the grinding space (A) to form a curvature for chucking the needle (N) with the tips of the chucks (120) facing each other. Looking at the step (S30) of grinding the tip plane of the 120 with the curvature 121,

First, when the movement of the chucks 120 is completed, as shown in FIG. 6 , a rod-shaped jig having a predetermined length smaller than the diameter of the needle N to be chucked into the grinding space A formed by the chucks 120 . Enter the grinder (G).

The material of the jig grinder may be any one of a whetstone, cemented carbide, and high-speed steel, and the hardness is preferably greater than that of the chuck.

When the entry of the jig grinder G is completed, the jig grinder G is driven to grind the front end plane of the chuck 120 with the curvature part 121 .

At this time, the jig grinder G grinds the front end plane of the chuck 120 with the curvature portion 121 while rotating and simultaneously moving in a curvature trajectory according to the diameter of the needle N in the grinding space A.

Here, the curvature trajectory is the same as the imaginary diameter D shown in FIG. 6 , and the front end of the chuck 120 is curved using a plurality of chucks 120 to chuck the outer peripheral surface of the needle N. ) is the trajectory drawn by the jig grinder (G) for grinding. That is, the trajectory coincides with the curvature of the curvature portion 121 formed at the tip of the chuck 120 .

And, when the jig grinder G grinds the curvature part 121 at the tip of the chuck 120, the gripper 100 in which the chuck 120 is installed rotates in the opposite direction to the jig grinder G, which are mutually This is to enable rapid grinding by rotating in the opposite direction.

In addition, the jig grinder (G) gradually widens the trajectory while going outward from the center of the grinding space (A) toward the curvature trajectory.

And in step S30, grinding is performed so that the curvature of the tip curvature portion 121 of the chuck 120 formed by the jig grinder G has a larger diameter than the diameter of the needle N, and the size of the curvature is 0.005 ? to 0.01?.

That is, the curvature of the curvature portion 121 of the chucks 120 is formed to be greater than the diameter of the needle N by 0.005 Φ to 0.01 Φ, and the detailed description thereof will be omitted as described above.

On the other hand, when grinding the tip curvature portion 121 of the chucks 120 using the jig grinder G, the moving member 130 may be prevented from being pushed by the pressing force applied to the curvature portion 121 . ) to continuously supply air until the grinding of the jig grinder (G) is completed.

Then, when the grinding of the curvature portion 121 of the tip of the chuck 120 using the jig grinder G is completed as shown in FIG. 7 , the grinding process is completed while the jig grinder G exits.

Here, the chuck 120, the tip curvature portion 121 grinding is to ensure that chucking of the chucking target needle (N) is made stably, and if the diameter of the chucking target needle (N) is changed, the chuck ( 120) will have to be processed through the order described above.

As described so far, in the chuck processing method of the gripper of the present invention, the jig grinder enters the jig grinder while moving the plurality of chucks installed in the gripper in the facing direction, and the tip of each chuck is drawn while the jig grinder draws a trajectory of the set diameter. By grinding the curvature of the chuck, it is possible to manufacture a dedicated gripper that allows each curvature of the grinded chuck to stably support only small-diameter needles. There is an excellent effect of dispersing the pressure through the contact area with the outer circumferential surface of the needle by making the surface contact where there is a gap so that the descent of the chucked needle can be made stably.

As mentioned above, the chuck processing method of the gripper of the present invention has been described with reference to the preferred embodiment and the accompanying drawings, but it goes without saying that this is only intended to help the understanding of the present invention and not to limit the technical scope of the present invention.

That is, without departing from the technical gist of the present invention, various modifications and alterations are possible by those skilled in the art to which the present invention pertains. It goes without saying that it is within.

100: gripper 110: body
120: chuck 121: curvature part
122: locking jaw 130: movable member
140: stopper 141: cylindrical part
142: locking part 143: elevating member
A : Grinding space B : Ball
D : virtual diameter G : jig grinder
N: Needle T: Gap

Claims (8)

delete delete delete delete delete delete A plurality of chucks 120 are arranged radially on the main body 110, and a curved portion 121 in contact with the outer circumferential surface of the needle (N) for chucking the needle (N) is formed at the distal end thereof;
a plurality of moving members 130 coupled to the chuck 120 and configured to move the chuck 120 by air supply; and
An elevating member 143 that receives elastic support from the inside and moves up and down while receiving one side of the needle N is disposed, and limits the moving distance of the chuck 120 that interlocks when the moving member 130 moves. A stopper 140; a gripper for welding the needle and the ball of the needle assembly for an automobile injector nozzle, characterized in that it is composed of.
8. The method of claim 7,
The curved portion 121 is a gripper for welding a needle and a ball of a needle assembly for an automobile injector nozzle, characterized in that it is intermittently formed while having a predetermined width.

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