JP7047712B2 - Posture correction device for spherical workpieces - Google Patents

Description

The present invention relates to a posture correction device for a spherical work.

Conventionally, a technique for a valve body portion of an injector having a ball valve has been proposed. As an example, in Patent Document 1, the valve body portion is composed of a plurality of spheres joined to each other coaxially on at least two or more, and the sphere at one end of the sphere has a valve body surface. We also propose a configuration in which at least one other sphere slides in the guide hole. By adopting this configuration, it is said that a simple configuration does not require strict processing accuracy, maintains a predetermined clearance accuracy, and can be easily assembled and processed.

Japanese Unexamined Patent Publication No. 5-71440

Here, when the sphere as the valve body portion is a so-called D-cut ball having a flat surface portion obtained by cutting out a part of the sphere, the posture of the D-cut ball, that is, the orientation of the flat surface portion is always a desired direction. There is difficulty in keeping it.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a posture correction device for correcting the posture of a spherical work having a D-shaped cross section having a flat surface portion obtained by cutting out a part of a sphere. Is.

The present invention is a posture correction device for rotating a spherical work (12) having a D-shaped cross section having a flat surface portion (14) obtained by cutting out a part of a spherical shape so that the flat surface portion faces in a desired direction. A cylindrical member (31) having an accommodating hole (35) capable of accommodating a work, and a plurality of intake ports (24) smaller than the diameter of the spherical work, and sucking the spherical work by intake air from the intake port. A plate (21) is provided.

This posture correction device for the spherical work faces the open end (32) of the tubular member from which the spherical work can be taken in and out so that the gap (W) with the suction plate is smaller than the diameter of the spherical work. .. Then, in a state where the spherical work is housed in the tubular member and faces the suction plate, the spherical work is placed in an arbitrary direction along the surface of the suction plate so that the flat surface portion is parallel to the surface of the suction plate. Roll and roll in a direction different from any direction along the surface of the suction plate. Here, the "direction different from the arbitrary direction" may be a direction orthogonal to the arbitrary direction or a direction diagonally intersecting the arbitrary direction.

In the posture correction device for a spherical work of the present invention, the spherical work is housed in a tubular member and rotated in at least two directions along the surface of the suction plate, for example, 270 ° or more. Then, as compared with the state where the spherical portion of the spherical work faces the surface of the suction plate, the state where the flat surface portion of the spherical work faces the surface of the suction plate secures a wider suction area and can strongly suck. As a result, the posture of the spherical work is maintained in a state where the flat surface portion is parallel to the surface of the suction plate. Therefore, the posture correction device for the spherical work of the present invention can appropriately correct the posture of the spherical work having a D-shaped cross section having a flat surface portion obtained by cutting out a part of the sphere.

It is sectional drawing of the injector for a diesel engine. FIG. 1 is an enlarged view of part II of FIG. It is a perspective view of a part of the posture correction device of the spherical work of embodiment. It is a perspective view of the suction plate. FIG. 5 is a schematic cross-sectional view taken along the line AA of FIG. 4 for explaining the suction action of the suction nozzle. FIG. 5 is a schematic cross-sectional view taken along the line AA of FIG. 4 for explaining the suction action of the suction nozzle. FIG. 5 is a schematic cross-sectional view taken along the line AA of FIG. 4 for explaining the suction action of the suction nozzle. It is a B arrow view of FIG. 4 explaining the operation of the suction plate. It is a B arrow view of FIG. 4 explaining the operation of the suction plate. It is a B arrow view of FIG. 4 explaining the operation of the suction plate. It is a B arrow view of FIG. 4 explaining the operation of the suction plate. It is a B arrow view of FIG. 4 explaining the operation of the suction plate. It is a figure which showed the locus which a spherical work rolls on the XY plane. It is sectional drawing which shows the state after the posture correction is completed. It is sectional drawing which shows the state which removed the temporary place | stand after the state of FIG. It is sectional drawing which turned upside down the XVI part of FIG. 2 which shows the process of arranging a spherical work on an injector. It is a figure which examines the force with respect to the rotational motion of a spherical work. It is a figure which examines the force concerning the maintenance of the adsorption state of a spherical work.

Hereinafter, embodiments of the posture correction device for the spherical work will be described with reference to the drawings. As shown in FIGS. 1 and 2, a spherical work 12 having a D-shaped cross section, which is made of ceramic and has a flat surface portion obtained by cutting out a part of a sphere, is arranged inside the injector 10 for a diesel engine. Inside the injector 10 for a diesel engine, there are a valve 15, a nozzle orifice 16, a knock pin 17, a solenoid 18, a retaining nut 19, a nozzle 20, and the like. A lower body 11 as an exterior is provided on the outside of the injector 10 for a diesel engine.

FIG. 3 shows a perspective view of the posture correction device 1 of the spherical workpiece. A plate-shaped suction plate 21 is arranged in the posture correction device 1 of the spherical work. The suction plate 21 sucks the spherical work 12. Further, a temporary stand 31 as a "cylindrical member" is arranged under the suction plate 21. The spherical work 12 is accommodated in the accommodating hole 35 of the temporary storage table 31. In the present embodiment, it is assumed that the accommodating hole 35 is open in the vertical direction.

As shown in FIG. 4, the suction plate 21 is formed with a portion 22 that is bent in a “dogleg” shape. Further, a suction nozzle 41, which is an intake device, and a holder 51 for holding the suction nozzle 41 are provided on the opposite side of the suction plate 21 from the temporary stand 31. The holder 51 is arranged with columnar protrusions 52, 52 that project so as to sandwich the suction plate 21. Further, both ends of the suction plate 21 in the longitudinal direction are held by the holding member 23. The spherical work 12 is sucked to the opposite position with the suction plate 21 of the suction nozzle 41 sandwiched between them.

5 to 7 are views for explaining the suction action of the suction nozzle 41, and time has elapsed as the process progresses from FIG. 5 to FIG. 7. FIG. 5 shows the state of the suction plate 21 at the stage where the spherical work 12 is not yet sucked on the suction plate 21. The suction plate 21 has a plurality of intake ports 24 (φ0.2 mm) smaller than the diameter Da (= φ1.6 mm) of the spherical work 12. By generating a negative pressure in the negative pressure passage 42 of the suction nozzle 41, the air is sucked in the direction of the block arrow M through the plurality of intake ports 24.

FIG. 6 shows a state in which the spherical work 12 is supplied and is adsorbed on the adsorption plate 21. The spherical work 12 is supplied in a state where the direction in the rotation direction is indefinite. Therefore, it is uncertain whether the spherical portion 13 of the spherical work 12 having a D-shaped cross section faces the suction plate 21 or the flat surface portion 14 faces the suction plate 21. Here, it is assumed that the spherical portion 13 of the spherical work 12 faces the suction plate 21, that is, the flat portion 14 first faces the ground. Further, the suction plate 21 sucks the spherical work 12 by the intake air from the intake port 24.

Next, the state in which the spherical work 12 adsorbed on the adsorption plate 21 is housed in the temporary placing table 31 which is a “cylindrical member” is the state shown in FIG. 7. Here, the open end portion 32 through which the spherical work 12 can be taken in and out faces the suction plate 21. Further, the gap W (= 0.2 mm) between the opening end portion 32 and the suction plate 21 is made smaller than the maximum diameter Da (= φ1.6 mm) of the spherical work 12.

Further, air pressure is applied to the spherical work 12 in the direction of the block arrow N from the hole 34 formed in the bottom portion 33 of the accommodation hole 35 of the temporary storage table 31. In this state, the spherical work 12 can freely rotate in the accommodating portion 35 without popping out from the accommodating portion 35 in which the spherical work 12 of the temporary storage table 31 is accommodated.

8 to 12 show the operation of the suction plate 21 after the state shown in FIG. 7, and the spherical work 12 is rolled along the surface of the suction plate 21 so as to draw a dogleg-shaped locus. Is shown in chronological order. Time has passed from FIG. 8 to FIG. Although not shown, the reciprocating operation is performed from FIG. 8 to FIG. 12 and then from FIG. 12 to FIG. Hereinafter, the left-right direction of FIGS. 8 to 12 is defined as the X-axis direction, and the vertical direction of FIGS. 8 to 12, which is the longitudinal direction of the suction plate 21, is defined as the Y-axis direction. The "K" -shaped locus means a locus that travels in one direction in the Y-axis direction and reciprocates from a reference position to another position in the X-axis direction.

As shown in FIGS. 8 to 12, both ends of the suction plate 21 are fixed to the holding member 23 with fasteners 28 and 28. Further, the suction plate 21 faces the suction plate 21 while the spherical work 12 is sucked by the intake air from the intake port 24 and the spherical work 12 is housed in the temporary storage table 31. Then, the spherical work 12 is rolled along the surface of the suction plate 21. At that time, the cam follower 27 provided in the recess 26 of the plate cam 25 rotates along the recess 53 of the holder 51, and the suction plate 21 and the holding member 23 are moved so as to draw a dogleg-shaped locus. .. At this time, the spherical work 12, the suction nozzle 41, the holder 51, and the temporary stand 31 do not move, and the spherical work 12 housed in the temporary stand 31 rolls along the surface of the suction plate 21.

While the spherical work 12 rolls along the surface of the suction plate 21, the surface of the suction plate 21 and the flat surface portion 14 of the spherical work 12 may face each other. Specifically, when the spherical work 12 is rotated by 270 ° or more when one rotation of the spherical work 12 is 360 ° in each of the X-axis direction and the Y-axis direction, the flat surface portion 14 is always attached to the suction plate 21. Facing the surface.

Here, by rolling so as to draw a dogleg-shaped locus as shown in FIG. 13, there is an effect of rolling in both the X-axis direction and the Y-axis direction at the same time. The circle shown in FIG. 13 is a rolling locus of the spherical work 12. In the example shown in FIG. 13, the movement range Tx in the X-axis direction is 8 mm, the movement range Ty in the Y-axis direction is 30 mm, and the distance U between the circles in the Y-axis direction is 2.5 mm. Further, the inclination angle of the "<" character is 40 ° with respect to the Y axis. Then, since the maximum diameter Da of the spherical work 12 is φ1.6 mm, not only the spherical portion 13 rolls along the surface of the suction plate 21, but the flat surface portion 14 always faces the surface of the suction plate 21. be. Further, by rolling the spherical work 12 so as to draw a “dogleg” -shaped locus, adverse effects due to slippage between the spherical work 12 and the suction plate 21 are unlikely to occur.

When the flat surface portion 14 faces the surface of the suction plate 21 in a state where the suction plate 21 sucks the spherical work 12 by suction from the intake port 24, the spherical portion 13 faces the surface of the suction plate 21 rather than facing the surface of the suction plate 21. The spherical work 12 is strongly adsorbed on the adsorption plate 21. The reason is that when the flat suction plate 21 and the flat surface portion 14 are brought into close contact with each other, the contact area between the suction plate 21 and the flat surface portion 14 is large, and the force of intake air from the intake port 24 is strongly received. Further, in the case of close contact between the spherical surface portion 13 and the suction plate 21, since the spherical surface portion 13 is not flat, the contact area with the flat suction plate 21 is small, and the force of intake air received from the intake port 24 is weak. Therefore, once the flat surface portion 14 faces the surface of the suction plate 21 and is in close contact with the surface, the posture is maintained even after that.

The above-mentioned "adverse effect of slipping between the spherical work 12 and the suction plate 21" is "sliding" in a state where the spherical surface portion 13 and the suction plate 21 are facing each other, that is, the operation shown in FIGS. 8 to 12. Say that it does not roll even if you do. Even if the operations shown in FIGS. 8 to 12 are performed in a state where the suction plate 21 and the flat surface portion 14 are in close contact with each other, it is a normal operation that the suction plate 21 and the flat surface portion 14 are kept in close contact with each other and do not “slip” and roll. In addition, it is confirmed by simulation whether the rotation of the spherical work 12 is impaired by the entrainment of air.

Then, by performing the reciprocating operation from FIG. 8 to FIG. 12 and from FIG. 12 to FIG. 8, the suction plate 21 and the flat surface portion 14 of the spherical work 12 come into close contact with each other as shown in FIG. , The posture correction of the spherical work 12 is completed. That is, the posture of the spherical work 12 is corrected from a state in which the flat surface portion 14 first faces a direction other than the heavenly direction to a state in which the flat surface portion 14 finally faces the heavenly direction. After that, the state in which the temporary stand 31 is removed so as not to affect the posture of the spherical work 12 is the state shown in FIG.

After that, as shown in FIG. 16, the sub-assembly 61 in which the spherical work 12 should be arranged in the manufacturing stage of the injector 10 is placed directly under the spherical work 12 adsorbed on the suction plate 21. Then, when the intake air from the intake port 24 is stopped, the spherical work 12 falls and is arranged at the position where the sub-assembly 61 should be arranged. After the spherical work 12 is once placed on the injector 10, the spherical work 12 may be fixed to the suction plate 21 again due to the influence of static electricity or the like. In such a case, a thin plate, paper, or the like is interposed between the suction plate 21 and the spherical work 12, and the scraping operation is performed so that the two do not stick to each other.

Next, with reference to FIG. 17, it is examined whether or not the operations of FIGS. 5 to 12 and 14 to 16 are possible. The condition that the spherical work 12 can rotate in the temporary table 31 is the vector P ₁ > P 2. Here, P ₁ = μ ₁ · F ₁ . Further, P ₂ = μ ₂ · F ₂ . Further, F ₁ = "force to lift the spherical work 12"-"mass of the spherical work 12". Further, the value of the air pressure (P) with respect to the spherical work 12 from the hole 34 is 0.4 [MPa]. The force taken in from the intake port 24 is −40 [kPa]. The mass m of the spherical work 12 is m = 0.02 [g]. Further, G is a gravitational acceleration (0.01 [N / g]).
F ₁ = π ・ (Da ^2/4 ) ・ Pm ・ G
= 2.01 [mm ² ] ・ 0.4 [MPa] -0.02 [g] ・ G
= 0.804 [N] -0.0002 [N] ≒ 0.8 [N]

Then, P ₁ which is a force acting in the rotation direction is obtained. Here, since μ ₁ = 0.2,
P ₁ = μ ₁ · F ₁ = 0.2 · 0.8 [N] = 0.16 [N]
Will be.

Furthermore, P ₂ which is a force that hinders rotation is obtained. Here, since F ₂ = 0.16 [N] and μ ₂ = 0.05,
P ₂ = μ ₂ · F ₂ = 0.16 [N] · 0.05 = 0.008 [N]
Will be. Therefore, P ₁ > P ₂ and the above operation is possible.

Further, with reference to FIG. 18, it is examined whether the flat surface portion 14 of the spherical work 12 can be stably maintained in a state of being strongly adsorbed on the adsorption plate 21. The condition of stability is Px · Lx> Py · Ly. Px and Py are vectors. The diameter of the flat surface portion 14 of the spherical work 12 is Lx. Further, the length of the perpendicular line drawn from the center O of the spherical portion 13 of the spherical work 12 to the flat surface portion 14 is Ly. In the example shown in FIG. 18, since Lx = 1.2 mm and Ly = 0.47 mm, the relationship of Px · Lx> Py · Ly was established, and the above spherical work 12 was strongly adsorbed on the suction plate 21. The state can be maintained stably.

As described above, the posture correction device 1 for the spherical work of the present embodiment accommodates the spherical work 12 in the temporary placement table 31 as a "cylindrical member", and accommodates the spherical work 12 in at least two directions along the surface of the suction plate 21. For example, rotate it by 270 ° or more. Then, the suction area is secured wider and stronger in the state where the flat surface portion 14 of the spherical work 12 faces the surface of the suction plate 21 than in the state where the spherical portion 13 of the spherical work 12 faces the surface of the suction plate 21. Can be adsorbed.

As a result, the posture of the spherical work 12 is maintained in a state where the flat surface portion 14 is parallel to the surface of the suction plate 21. Therefore, the posture correction device 1 for the spherical work of the present invention can appropriately correct the posture of the "spherical work 12 having a D-shaped cross section having the flat surface portion 14 obtained by cutting out a part of the sphere". Further, the spherical work 12 can be appropriately arranged at the position where the sub-assembly 61 should be arranged while maintaining the posture.

(Other embodiments)
In the above embodiment, the spherical work 12 is rolled along the surface of the suction plate 21 so as to draw a dogleg-shaped locus. However, for example, the spherical work 12 may be rolled separately in the X-axis direction and the Y-axis direction along the surface of the suction plate 21. Further, it may be rolled in an arbitrary direction along the surface of the suction plate 21 and in a direction different from that direction, that is, in a direction orthogonal to each other or in a direction at which the suction plate 21 intersects diagonally.

However, when the spherical work 12 is rolled separately in the X-axis direction and the Y-axis direction along the surface of the suction plate 21, an actuator for rolling in the X-axis direction and an actuator for rolling in the Y-axis direction are used. Requires two actuators. In that respect, when rolling so as to draw a "<" -shaped locus, it is possible to roll the spherical work 12 with one actuator, which is advantageous for reducing the number of parts.

In the above embodiment, air pressure is applied to the spherical work 12 from the hole 34 formed in the bottom 33 of the accommodating hole 35 of the temporary storage table 31. However, the air pressure from the hole 34 to the spherical work 12 is not always necessary. However, in order to increase the value of F ₁ described above and facilitate the condition of the vector P ₁ > P ₂ , the air pressure (P) is applied to the spherical work 12 from the hole 34. Is good, and the value should be large to some extent.

In the above embodiment, after proceeding from FIG. 8 to FIG. 12, the operation of proceeding from FIG. 12 to FIG. 8, that is, the reciprocating operation is performed. However, such reciprocating motion is not always necessary. However, since it is rational to reciprocate from the origin position in the operation of the posture correction device 1 of the spherical work, it is preferable to reciprocate.

In the above embodiment, the posture of the spherical work 12 changes from a state in which the flat surface portion 14 first faces a direction other than the top direction (for example, the ground direction) to a state in which the flat surface portion 14 faces the top direction at the end. Be corrected. In another embodiment, on the contrary, the flat surface portion 14 first faces a direction other than the ground direction (for example, the heavenly direction), and finally the flat surface portion 14 faces the ground direction. , The posture of the spherical work 12 may be corrected. Alternatively, the posture of the spherical work 12 may be corrected so that the flat surface portion 14 has a specific inclination angle. In short, the direction in which the flat surface portion 14 is corrected in the present invention does not matter.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various embodiments without departing from the gist thereof.

1 ... Posture correction device for spherical work 12 ... Spherical work 31 ... Temporary stand (cylindrical member)
21 ... Suction plate 24 ... Intake port 32 ... Open end 33 ... Bottom W ... Gap

Claims (4)

A posture correction device for rotating a spherical work (12) having a D-shaped cross section having a flat surface portion (14) obtained by cutting out a part of the spherical shape so that the flat surface portion faces in a desired direction.
A tubular member (31) having a storage hole (35) capable of accommodating the spherical work,
A suction plate (21) having a plurality of intake ports (24) smaller than the diameter of the spherical work and adsorbing the spherical work by intake air from the intake port.
Equipped with
Of the cylindrical members, the open end (32) through which the spherical work can be taken in and out is opposed so that the gap (W) with the suction plate is smaller than the diameter of the spherical work.
The spherical work is housed in the tubular member, and the spherical work is placed along the surface of the suction plate so that the flat surface portion is parallel to the surface of the suction plate in a state of facing the suction plate. A posture correction device for a spherical work that rolls in an arbitrary direction and rolls in a direction different from the arbitrary direction along the surface of the suction plate. The spherical work is housed in the tubular member and is opposed to the suction plate.
The posture correction device for a spherical work according to claim 1, wherein air pressure is applied to the spherical work from a hole (34) formed in the bottom portion (33) of the accommodation hole. The spherical work is housed in the tubular member and is opposed to the suction plate.
The posture correction device for a spherical work according to claim 1 or 2, wherein the spherical work is rolled so as to draw a dogleg-shaped locus along the surface of the suction plate. Any of claims 1 to 3 in which the posture of the spherical work is corrected from a state in which the flat surface portion faces a direction other than the vertical direction first to a state in which the flat surface portion faces the vertical direction at the end. The posture correction device for the spherical workpiece according to item 1.

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