JP2010260148A - Apparatus and method of machining injector nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method of machining an injector nozzle, which can change an machining amount for each injection hole of injector nozzle of an injector for an internal combustion engine. <P>SOLUTION: The machining apparatus 1 of the injection nozzle grinds a plurality of injection holes 105 formed in the end 100c of an injector nozzle 100 by sending and supplying an abrasive grain suspension liquid S to the injection holes 105, and is provided with: a sending and supplying apparatus 5 for sending and supplying the abrasive grain suspension liquid S to the injection holes 105; and an injection hole closing member 2 which circumscribes the end 100c of the injector nozzle 100 and closes the injection holes 105 excluding at least one of them. The machining apparatus is characterized in that it grinds the injection holes while sequentially changing the injection holes 105 not closed by the injection hole closing member 2 by relatively displacing the injector nozzle 100 and the injection hole closing member 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an injector nozzle processing apparatus and processing method, and more particularly to a technique for grinding (polishing) an injection nozzle of an injector nozzle using an abrasive suspension.

  Conventionally, as a method of finishing an injection hole formed by drilling or the like in an injector nozzle of an internal combustion engine injector, abrasive suspension is circulated through the injection hole, and the injection hole is ground and polished by the abrasive suspension. Techniques may be taken. Grinding with the abrasive suspension is suitable for processing micro holes such as injection holes, adjusting the diameter of the injection holes and adjusting the surface roughness of the inner surface of the injection holes, and forming an R portion at the opening end of the injection holes. Can be formed (for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 7-52022 JP 10-337649 A

  However, in the conventional grinding process using the abrasive suspension, the abrasive suspension pressurized by the feeding device is fed into the injector nozzle, and the abrasive suspension is supplied from the inside of the injector nozzle to each injection hole. Therefore, the abrasive suspension is supplied almost uniformly to all of the plurality of injection holes. Therefore, it is impossible to set the abrasive suspension feeding conditions (abrasive suspension pressure, feeding time, etc.) for each injection hole, and the processing amount (grinding amount) of each injection hole becomes the same. There is.

  This invention is made in view of the above problem, Comprising: It aims at providing the processing apparatus and processing method of an injector nozzle which can change a process amount for every injection hole.

  In order to solve the above-mentioned problem, the first invention is to distribute the abrasive suspension (S) through a plurality of injection holes (105) formed at the tip (100c) of the injector nozzle (100). An injector nozzle processing device (1) for grinding the injection hole, a feeding device (5) for supplying the abrasive suspension to the injection hole, and a circumscribing portion for the tip of the injector nozzle And an injection hole closing member (2) that closes the injection hole except at least one, and the injection hole closing member is capable of arbitrarily selecting an injection hole that is not blocked by the injection hole closing member. The injector nozzle is provided so as to be relatively displaceable with respect to the injector nozzle.

  According to this configuration, it is possible to arbitrarily select the injection hole through which the abrasive suspension is circulated by the injection hole closing member. Therefore, it becomes possible to set the feed condition of the abrasive suspension for each selected injection hole, and to change the processing amount for each injection hole.

  The second invention is characterized in that, in the first invention, a closing member holder (3) for supporting the injector nozzle and supporting the injection hole closing member is provided.

  According to this configuration, since the closing member holder supports both the injector nozzle and the injection hole closing member, the positional relationship between the injector nozzle and the injection hole closing member is stabilized. Further, by using the injection hole closing member and the closing member holder as separate members, it is possible to replace only the injection hole closing member with a corresponding shape in accordance with the shapes of the injector nozzle and the injection hole.

  According to a third invention, in the second invention, a nozzle holder (4) for supporting the injector nozzle is provided, and position confirmation means (61, 62) for confirming a relative position between the closing member holder and the nozzle holder. ). For example, the position confirmation means may be a scale when visually confirmed, and may be a potentiometer, a resolver, or an optical encoder when electrically confirmed.

  According to this configuration, the relative position between the closing member holder and the injector nozzle can be confirmed, the relative position between the injector nozzle and the closing member can be recognized, and the injection holes not closed by the closing member are recognized. be able to.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the injection hole is disposed on the same circumference centering on an axis (A) of the injector nozzle, and the injection hole closing member is The through hole is provided so as to be rotatable relative to the injector nozzle about the axis, and has a through hole continuous with at least one of the injection holes at a predetermined rotational position.

  According to this structure, the injection hole which is not obstruct | occluded by the injection hole obstruction | occlusion member can be changed by relative rotation of an injector nozzle and an injection hole obstruction | occlusion member.

  5th invention is the processing method of the injector nozzle which grinds an injection hole using the processing apparatus of the injector nozzle in any one of 1st-4th invention, Comprising: The said injection hole obstruction | occlusion member is said injector A step of selecting a spray hole which is displaced relative to the nozzle and is not blocked by the spray hole blocking member, and a step of feeding the abrasive suspension to the spray hole by the feeding device under an arbitrary processing condition. It is characterized by including.

  According to this configuration, it is possible to set processing conditions for each injection hole, and it is possible to change the shape of the injection hole for each hole.

  According to the above configuration, it is possible to obtain an injector nozzle machining apparatus that can set machining conditions for each injection hole and change the machining amount. Moreover, it becomes possible to change a shape for every injection hole with the processing method using the said processing apparatus.

Sectional view showing the injector nozzle processing device FIG. 1 is an enlarged cross-sectional view showing a portion II. III-III sectional view of FIG. The perspective view which shows the principal part of the processing apparatus of an injector nozzle Flow chart showing the processing steps of the injection hole

  Hereinafter, an embodiment in which the present invention is applied to an injector nozzle processing apparatus used in an injector of an automobile internal combustion engine will be described in detail with reference to the drawings. The injector nozzle processing apparatus according to the embodiment is an apparatus for grinding (polishing) an injection hole formed at the tip of the injector nozzle with an abrasive suspension.

  FIG. 1 is a cross-sectional view showing a processing apparatus 1 for an injector nozzle 100 according to an embodiment, and shows a state in which an injector nozzle 100 as a workpiece is set in the processing apparatus 1. In the following description, the upper side of the drawing in FIG. As shown in FIG. 1, the injector nozzle 100 includes a columnar base end portion 100a, a columnar central portion 100b formed to have a smaller diameter than the base end portion 100a, and a conical tip portion having a tapered front end side. 100c is coaxially provided in order from the base end side. A nozzle hole 101 that slidably accommodates a needle valve (not shown) along the axis A of the injector nozzle 100 opens in the proximal end portion 100a, the central portion 100b, and the distal end portion 100c. It is formed with.

  A fuel reservoir 102 having a diameter larger than that of the nozzle hole 101 is formed at an intermediate portion in the direction of the axis A of the nozzle hole 101, and a fuel supply hole 103 extending to the base end surface of the injector nozzle 100 is formed in the fuel reservoir 102. It is continuous. A guide portion 104 projecting in the radial direction is formed on the outer peripheral portion on the proximal end side of the central portion 100b.

  As shown in FIG. 2 and FIG. 3, eight injection holes 105 that penetrate from the outer surface to the nozzle hole 101 are formed in the tip end portion 100 c of the injector nozzle 100. The opening ends on the outer surface of the tip end portion 100c of each injection hole 105 are arranged at equal intervals with an interval of 45 ° around the axis A of the injector nozzle 100 (see FIG. 3).

  The injector nozzle 100 is made of a metal material, and is set in the processing apparatus 1 in a state where the nozzle hole 101, the fuel supply hole 103, and the injection hole 105 are previously drilled.

  As shown in FIG. 1, the processing device 1 includes an injection hole closing member 2, a closing member holder 3, a nozzle holder 4, a feeding device 5, and a stirring tank 6 as main components. The injection hole closing member 2, the closing member holder 3, and the nozzle holder 4 are arranged coaxially with the axis A of the injector nozzle 100.

  As shown in FIGS. 1 to 3, the injection hole closing member 2 has a cylindrical shape, and has a holding hole 11 into which the tip end portion 100 c of the injector nozzle 100 is fitted. Two communication holes 12 penetrating the outer peripheral surface of the injection hole closing member 2 are formed on the inner peripheral surface of the holding hole 11. As shown in FIG. 3, the communication holes 12 are arranged at an angle of 180 ° with respect to the axis A, and are stepped holes whose radially outer portions are enlarged. A pin hole 13 is formed on the lower end surface of the injection hole closing member 2.

  The closing member holder 3 includes a columnar main body 14 and a disk-shaped flange 15 formed at the upper end of the main body 14, and the flange 15 is supported on the upper surface of the base 7. . A bottomed and cylindrical support hole 16 is formed along the axis of the upper end surface of the closing member holder 3. A cylindrical recess 17 into which the injection hole closing member 2 is fitted is formed on the bottom surface 16 a of the support hole 16.

  A pin hole 18 is formed on the bottom surface of the recess 17, and when the injection hole closing member 2 is fitted into the recess 17, a knock pin 19 is inserted into the pin hole 13 of the injection hole closing member 2 and the pin hole 18 of the recess 17. Is inserted. Thereby, rotation prevention of the injection hole obstruction | occlusion member 2 with respect to the obstruction | occlusion member holder 3 is made | formed.

  The closing member holder 3 is formed with two discharge holes 21 communicating with the communication hole 12 of the injection hole closing member 2 and extending to the outer surface of the main body 14 in a state where the injection hole closing member 2 is fitted. Yes. A through-hole 22 extending downward along the axis of the main body 14 is formed at the center of the bottom surface of the recess 17.

  The distal end portion 100c and the central portion 100b of the injector nozzle 100 are inserted into the support hole 16 of the closing member holder 3. The guide portion 104 of the injector nozzle 100 is inscribed in the inner peripheral surface of the support hole 16, and displacement (falling) during insertion of the injector nozzle 100 is prevented. The tip portion 100 c of the injector nozzle 100 is fitted into the holding hole 11 of the injection hole closing member 2, and the outer surface of the tip portion 100 c of the injector nozzle 100 is covered with the inner surface of the holding hole 11. In this state, the injector nozzle 100 and the injection hole closing member 2 can be rotated relative to each other around the axis A, and the two communication holes of the injection hole closing member 2 at a predetermined relative rotation position (relative angle). The hole 12 and the two injection holes 105 communicate with each other.

  The nozzle holder 4 includes a columnar main body 25 and a boss 28 that is press-fitted into the upper end of the main body 25. A cylindrical support hole 26 into which the base end portion 100 a of the injector nozzle 100 is fitted is formed in the main body portion 25 along the axis of the main body portion 25. A through hole 27 that penetrates in the axial direction is formed in the boss portion 28, and the through hole 27 is continuous with the support hole 26. The through hole 27 has a smaller diameter than the support hole 26, and the lower end surface of the boss portion 28 forms a step portion 28a. In other embodiments, the main body portion 25 and the boss portion 28 may be a single piece.

  A pin hole 29 is formed in the stepped portion 28 a, and a pin hole 106 is formed in the base end portion 100 a of the injector nozzle 100. When the base end portion 100 a of the injector nozzle 100 is fitted into the support hole 26, the knock pin 31 is fitted into the pin hole 29 and the pin hole 106. Thereby, the rotation of the injector nozzle 100 with respect to the nozzle holder 4 is prevented. In a state where the injector nozzle 100 is fitted in the nozzle holder 4, the nozzle hole 101 of the injector nozzle 100 communicates with the through hole 27 of the nozzle holder 4.

  An annular groove 32 is formed on the upper end surface of the boss portion 28 so as to surround the through hole 27, and an O-ring 33 is attached to the annular groove 32.

  As shown in FIG. 4, a scale 61 indicating an angle is formed on the outer peripheral surface of the main body portion 25 of the nozzle holder 4 over the entire circumference, and a reference line 62 is provided on the outer peripheral surface of the flange portion 15 of the closing member holder 3. Is formed. Thereby, the operator can recognize the relative angle (position) of the nozzle holder 4 to the closing member holder 3. That is, the operator can recognize the position of the injector nozzle 100 with respect to the injection hole closing member 2 and can recognize the injection holes 105 that are not closed by the injection hole closing member 2. For example, in this embodiment, the scale 61 is described from 0 to 360 °, and the reference line 62 coincides with 0 °, 45 °, 90 °,... 315 ° (multiple of 45 °) of the scale 61. In addition, the communication hole 12 communicates with a predetermined injection hole 105.

  A cylinder 41 of the feeding device 5 that feeds the abrasive suspension S to the injector nozzle 100 via the nozzle holder 4 is connected to the upper end surface of the boss portion 28 of the nozzle holder 4. The cylinder 41 is formed with a feed hole 42 communicating with the through hole 27 of the nozzle holder 4. An annular convex portion 43 for guiding the contact position of the boss portion 28 is formed on the lower end surface of the cylinder 41, and the nozzle holder 4 and the cylinder 41 are in a state where the through hole 27 and the feeding hole 42 communicate with each other. And are connected.

  A piston 44 is slidably accommodated in the cylinder 41. The piston 44 is driven in the vertical direction by an actuator (not shown) and feeds the pressurized abrasive suspension S to the nozzle holder 4 and the injector nozzle 100 ”through the feed hole 42. The cylinder 41 is connected to the stirring tank 6 in which the abrasive suspension S is stored via a pipe 45 and receives the supply of the abrasive suspension S from the stirring tank 6.

  The agitation tank 6 is connected to a recovery tank 47 disposed below the closing member holder 3 via a pipe 48. The abrasive suspension S recovered by the recovery tank 47 is transferred to the agitation tank 6 by a pump (not shown). Further, the stirring tank 6 is provided with fins 49 for stirring and mixing the abrasive suspension S. The abrasive suspension S is composed of abrasive grains and a medium that holds the abrasive grains in a dispersed state.

  Next, a procedure for grinding the injection hole 105 of the injector nozzle 100 using the processing apparatus 1 according to the present embodiment will be described with reference to a flow showing the processing steps of the injection hole 105 of FIG. As shown in FIG. 5, first, the injector nozzle 100 is set in the processing apparatus 1 in the state shown in FIG. 1 (S1). That is, the tip end portion 100 c and the central portion 100 b of the injector nozzle 100 are inserted into the support hole 16 of the closing member holder 3 supported by the base 7, and the tip end portion 100 c is fitted into the holding hole 11 of the injection hole closing member 2. Then, the base end portion 100 a is fitted into the support hole 26 of the nozzle holder 4, and the nozzle hole 101 of the injector nozzle 100 and the through hole 27 of the nozzle holder 4 are made continuous. Further, the cylinder 41 of the feeding device 5 is connected to the nozzle holder 4, and the through hole 27 of the nozzle holder 4 and the feeding hole 42 of the cylinder 41 are made continuous.

  Next, the communication hole 12 of the injection hole closing member 2 is aligned with the injection hole 105 to be ground (S2). In this embodiment, since the two communication holes 12 are provided at an interval of 180 °, any two injection holes 105 facing each other among the eight injection holes 105 are selected and the communication holes 12 are selected. Make it continuous. The operation of matching the communication hole 12 with the selected injection hole 105 is performed by rotating the nozzle holder 4 relative to the closing member holder 3 around the axis A while visually confirming the scale 61 and the reference line 62. . In the present embodiment, the reference line 62 is set to 0 ° of the scale 61.

  Next, the feeding device 5 is driven to feed the abrasive suspension S to the injector nozzle 100 and the injection hole 105, and the injection hole 105 continuing to the communication hole 12 is ground (S3). The feed conditions such as the feed time and feed pressure of the abrasive suspension S at this time may be arbitrarily set. When a predetermined feeding time elapses, the feeding of the abrasive suspension S by the feeding device 5 is stopped.

  Next, it is checked whether or not there is an injection hole 105 that needs to be ground other than the injection hole 105 that has been ground in S3. If it exists (Yes), the process proceeds to S2, and if it does not exist (No) ) Ends the processing step of the injection hole 105. In the case of the present embodiment, the above-described steps S2 and S3 are performed a total of four times in order to grind the other six injection holes 105 other than the injection holes 105 processed in S3. Specifically, the scale 61 and the reference line 62 are confirmed in S3, the nozzle holder 4 is rotated by 45 ° with respect to the closing member holder 3, and the selected injection hole 105 is changed. Then, the abrasive suspension S is fed to the injection hole 105 selected under any feeding condition in S3. In other embodiments, the type (characteristic) of the abrasive suspension S to be used may be changed in subsequent processing steps.

  By performing processing using the processing apparatus 1 as described above, it is possible to change the processing conditions for each of the injection holes 105 with respect to the plurality of injection holes 105 and change the size and shape of each of the injection holes 105. Become. Further, in this embodiment, since the injection hole closing member 2 is configured as a separate member from the closing member holder 3, the injection hole is closed corresponding to the shape of the tip portion 100 c of the injector nozzle 100 and the position and size of the injection hole 105. It is possible to deal with various types of processing of the injector nozzle 100 simply by replacing the member 2.

  Although the description of the specific embodiment is finished as above, the present invention is not limited to the above embodiment and can be widely modified. For example, the number of communication holes 12 can be arbitrarily changed. In the present embodiment, the relative rotational position of the closing member holder 3 and the nozzle holder 4 is visually changed using the scale 61 and the reference line 62. For example, a potentiometer, a resolver, or an optical encoder is used. Then, the relative rotation position between the closing member holder 3 and the nozzle holder 4 may be detected, and the nozzle holder 4 may be rotated relative to the closing member holder 3 by driving an actuator based on the detection signal.

  In the present embodiment, the abrasive suspension S flows from the inside of the injector nozzle 100 in the order of the injection hole 105, the communication hole 12 of the injection hole closing member 2, and the discharge hole 21 of the closing member holder 3. The feed hole device 5 may be connected to the closing member holder 3 so that the abrasive suspension S flows in the order of the discharge hole 21, the communication hole 12, the injection hole 105, and the injector nozzle 100.

  1 .... Processing device, 2 .... Injection hole closing member, 3 .... Blocking member holder, 4 .... Nozzle holder, 5 .... Feeding device, 11 .... Holding hole, 12 .... Communication hole, 61 .... Scale (Position confirming means), 62 .. Reference line (Position confirming means), 100... Injector nozzle, 100 c.

Claims (5)

A processing device for an injector nozzle that grinds the injection hole by circulating abrasive suspension through a plurality of injection holes formed at the tip of the injector nozzle,
A feeding device for feeding the abrasive suspension to the injection holes;
An injection hole closing member that circumscribes the tip of the injector nozzle and closes the injection hole except at least one;
The injector nozzle processing apparatus, wherein the injection hole closing member is provided so as to be relatively displaceable with respect to the injector nozzle so that an injection hole not blocked by the injection hole closing member can be arbitrarily selected.   The injector nozzle processing device according to claim 1, further comprising a closing member holder that supports the injector nozzle and supports the injection hole closing member. A nozzle holder for supporting the injector nozzle;
The injector nozzle processing apparatus according to claim 2, further comprising a position confirmation means for confirming a relative position between the closing member holder and the nozzle holder. The injection holes are arranged on the same circumference around the axis of the injector nozzle,
The injection hole closing member is provided so as to be relatively rotatable with respect to the injector nozzle about the axis, and has a through hole continuous with at least one of the injection holes at a predetermined rotation position. The processing apparatus of the injector nozzle of any one of Claims 1-3. An injector nozzle processing method for grinding the injection hole using the injector nozzle processing apparatus according to any one of claims 1 to 4,
Displacing the injection hole closing member relative to the injector nozzle, and selecting an injection hole not blocked by the injection hole closing member;
And a step of feeding the abrasive suspension to the injection hole under an arbitrary machining condition by the feeding device.

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