JP2017112307A - Suction nozzle, surface mounting machine, and method of manufacturing nozzle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly accurate suction nozzle which becomes maintenance free as much as possible over a long period of time.SOLUTION: The suction nozzle includes a nozzle holder 21 and a nozzle body 22. The nozzle body 22 has a base end portion (a fitting cylinder 43) which is slidably fitted in a fitting hole 27 of the nozzle holder 21 and a tip end portion (a nozzle chip 42) on which a component suction surface 42a for sucking electronic components is formed. On the base end portion of the nozzle body 22, annular grooves 101 to 105 are continued along a circumferential direction of the fitting hole 27.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a suction nozzle, a surface mounter, and a method for manufacturing a nozzle body.

  As a conventional suction nozzle of this type, there is one described in Patent Document 1, for example. The suction nozzle disclosed in Patent Document 1 includes a nozzle holder attached to a pneumatic control system, and a nozzle body that is slidably fitted into a fitting hole of the nozzle holder.

  The nozzle holder is a hollow body that forms an air passage together with the nozzle main body, and the lower opening portion thereof constitutes a fitting hole.

  On the other hand, the nozzle body is a hollow cylindrical body, and the base end portion of the outer peripheral surface thereof is fitted in the fitting hole of the nozzle holder, and is connected by a connecting member such as a pin.

  The nozzle body repeats the projecting operation of projecting from the nozzle holder and the contracting operation of retracting to the nozzle holder to perform the mounting operation of the electronic component. In order to ensure the operation accuracy of the nozzle body and maintain high mounting accuracy, it is preferable that the base end portion of the nozzle body is joined as closely as possible to the fitting hole of the nozzle holder. Therefore, the base end portion of the nozzle body is fitted in the fitting hole with a very small tolerance.

JP 2008-300598 A

  As described above, the fitting hole of the nozzle holder is set to be very narrow with respect to the base end portion of the nozzle body. Therefore, even if a small amount of dust or the like is mixed in the fitting hole, the slidability of the nozzle body is affected, resulting in a malfunction (sliding failure) in which the nozzle body does not return to the normal position after operation. There is a fear.

  On the other hand, as use continues, wear tends to occur at the sliding contact portion between the nozzle holder and the nozzle body, and foreign matters such as wear debris and wear debris tend to remain. If such foreign matter is mixed into the gaps of the fitting holes, the above-described malfunction tends to occur.

  In order to avoid such a malfunction, conventionally, maintenance such as regular cleaning and refueling has been required. However, such maintenance work is time-consuming and causes a reduction in operating rate and high cost.

  The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a highly accurate suction nozzle, a surface mounter, and a method for manufacturing a nozzle body that are as maintenance-free as possible over a long period of time. Yes.

  In order to solve the above problems, a first aspect of the present invention is a nozzle holder attached to a pneumatic control system and having a fitting hole, a base end portion slidably fitted in the fitting hole, In a suction nozzle including a nozzle body including a tip portion on which a component suction surface a for sucking an electronic component is formed, the base end portion of the nozzle body is provided along a circumferential direction of the fitting hole. The suction nozzle is characterized in that a continuous annular groove is formed. In this aspect, by forming an annular groove that is continuous along the circumferential direction of the fitting hole, foreign matter that may be generated between the fitting hole and the base end portion of the nozzle body is easily collected in the annular groove. . Therefore, even if the base end of the nozzle body is fitted into the fitting hole with a very small tolerance and used over a long period of time, foreign matter such as wear debris and wear debris generated over time will remain on the nozzle body. It becomes difficult to affect the sliding contact surface between the nozzle body and the sliding movement of the nozzle body can be kept smooth. As a result, not only the maintainability is remarkably improved, but also a sliding failure is hardly caused.

  The suction nozzle according to a preferred aspect further includes a pin disposed along a direction perpendicular to the center line direction of the fitting hole, and the pin slides in the center line direction on the outer peripheral surface of the base end portion. A flat engagement surface is formed, and the annular groove is formed at a position communicating with the engagement surface. In this aspect, the pin and the engagement surface are connected so as to slide in the center line direction, so that the nozzle body is allowed to move relative to the nozzle holder along the center line direction of the fitting hole. Is done. Moreover, the nozzle body is connected to the nozzle holder so as to be restricted from rotating relative to the nozzle holder around the center line, and performs a projecting operation and a contracting operation. The foreign matter such as wear debris and wear debris generated between the pin and the engagement surface in accordance with this operation is efficiently collected in the annular groove from the communicating portion between the annular groove and the engagement surface. Moreover, since the annular groove is formed at a position communicating with the engagement surface, burrs generated when the engagement surface is processed after the formation of the annular groove can be released into the annular groove. Therefore, it is possible to obtain a fitting structure with good slidability without performing a post-process such as deburring.

  In a preferred aspect of the suction nozzle, the annular groove communicating with the engagement surface includes at least a first annular groove communicating with a portion of the engagement surface that defines the lowermost end of the nozzle body. In this aspect, in particular, it is possible to eliminate the influence of the burr at the portion that directly affects the lowermost end of the nozzle body having a severe dimensional tolerance.

  In the suction nozzle according to a preferred aspect, the annular groove communicating with the engagement surface further includes a second annular groove communicating with a portion of the engagement surface that defines the uppermost end of the nozzle body. In this aspect, even when the portion of the engaging surface that defines the uppermost end of the nozzle body is formed on the engaging surface, it is possible to eliminate the influence of burrs that may occur in the portion.

  In a preferred embodiment of the suction nozzle, the second annular groove has a groove width larger than that of the other annular groove communicating with the engagement surface. In this aspect, the second annular groove formed in the portion that has a relatively low influence on the forward / backward movement of the nozzle body is less likely to cause rattling of the nozzle body due to the relationship with the pin. Is set larger. As a result, the contact area between the nozzle body and the fitting hole can be reduced to suppress the influence of friction or the like.

  In the suction nozzle according to a preferred aspect, the annular groove further includes a third annular groove formed at a position deviated from the engagement surface, and at least the first annular groove among the annular grooves communicating with the engagement surface. In the case of including the groove, the groove depth is set shallower than that of the third annular groove. In this aspect, when the annular groove is communicated with the engagement surface, it is possible to suppress the reduction of the line contact length between the pin and the engagement surface as much as possible, and a connection structure with less play can be obtained.

  According to another aspect of the present invention, there is provided a suction nozzle as described above and a suction head that holds a nozzle holder of the suction nozzle, and the electronic component sucked by the suction nozzle is mounted on a printed circuit board. It is a surface mounting machine characterized by being made.

  Still another aspect of the present invention includes a base end portion that is slidably fitted in a fitting hole of a nozzle holder, and a tip end portion on which a component adsorption surface that adsorbs an electronic component is formed, and the nozzle holder In addition, in the manufacturing method of the nozzle body constituting the suction nozzle, a step of measuring a cylindrical metal member to form a shaft member having an annular groove, and fixing the nozzle tip to the tip of the shaft member after processing the annular groove And a step of forming a pin sliding engagement surface fixed to the nozzle holder in the vicinity of the base end portion of the shaft member to which the nozzle tip is fixed, and the annular groove includes the engagement It is a manufacturing method of a nozzle body, wherein the nozzle body is formed at a position communicating with a surface. In this aspect, after the nozzle tip is fixed to the shaft member in advance, a flat engagement surface that defines the stroke of the shaft member is formed, so that the dimensional accuracy of the engagement surface at the time of finishing is increased and the product yield is increased. Will improve. Moreover, since the annular groove is formed in the shaft member in advance, and this annular groove is formed at a position communicating with the engagement surface, the burr generated when the engagement surface is formed is released into the annular groove. Can do. As a result, even if the deburring operation is omitted, it is possible to manufacture a nozzle body having extremely good sliding characteristics.

  As described above, according to the present invention, the base end portion of the nozzle body is fitted into the fitting hole with a very small tolerance, and even if used over a long period of time, wear debris and wear debris generated over time The foreign matter is less likely to affect the sliding contact surface between the nozzle body and the fitting hole, and the sliding movement of the nozzle body can be maintained smoothly, making it as maintenance-free as possible over a long period of time. There is a remarkable effect that a highly accurate product can be obtained.

  Further features, objects, configurations, and advantages of the present invention will be readily understood from the following detailed description that should be read in conjunction with the accompanying drawings.

1 is a schematic plan view of a surface mounter showing an embodiment of the present invention. It is explanatory drawing of 1st Embodiment of the suction nozzle employable for the surface embodiment of FIG. 1, (A) is a front view, (B) is a longitudinal cross-sectional view. It is a perspective view which shows the external appearance of the suction nozzle which concerns on 1st Embodiment. It is a longitudinal cross-sectional view which expands and shows the principal part of the suction nozzle which concerns on 1st Embodiment, (A) shows at the time of the protrusion operation | movement of a nozzle main body, (B) shows the time at the time of degeneracy operation | movement of a nozzle main body, respectively. It is a perspective view which expands and shows the principal part of the suction nozzle which concerns on 1st Embodiment. It is explanatory drawing which shows the connection structure of the nozzle main body and nozzle holder which concern on 1st Embodiment, (A) is a cross-sectional view which shows a site | part without an annular groove among the parts in which the engagement surface is formed, ( B) is a cross-sectional view showing a portion where the annular groove is formed in the portion where the engagement surface is formed, and (C) is a portion of the annular groove formed in the portion where the engagement surface is not formed. FIG. It is a perspective view which shows the test article which concerns on 1st Embodiment of this invention, (A) shows a prior art example, (B) shows Example 1, (C) shows Example 2. FIG. It is a photograph which shows the external appearance before the test of Example 2, (A) is an enlarged photograph of the engaging surface part before a test start, (B) is an enlarged photograph of B part of (A). It is a photograph which shows the external appearance after the test of Example 2, (A) (B) is a photograph which shows the external appearance after implementing 16 million times, (C) (D) is FIG.8 (B). It is a photograph of an equivalent part. It is a perspective view of 2nd Embodiment. It is the longitudinal cross-sectional view which expands and shows the principal part of the suction nozzle which concerns on 2nd Embodiment of this invention, (A) is a front view, (B) is a longitudinal cross-sectional view.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

(Surface mount machine)
The suction nozzle 1 according to each embodiment of the present invention is used by being attached to the suction head 3 of the surface mounter 2 shown in FIG. 1, for example. Therefore, first, the surface mounter 2 in FIG. 1 will be described. In the following description, the horizontal direction along the conveyance direction of the printed board W (only shown in FIG. 1) conveyed to the surface mounter 2 is defined as the X direction, and the horizontal direction orthogonal to the X direction is defined as the Y direction. Further, with the surface mounter 2 as a reference, one of the Y directions is assumed to be the front.

  The surface mounter 2 shown in FIG. 1 includes a base 4 having a substantially rectangular shape in plan view installed on a conveyance line along the X direction, a conveyor 5 provided along the X direction at the center of the base 4, A plurality of component supply units 6 provided at both front and rear ends of the base 4 with the conveyor 5 interposed therebetween, and electronic components P (see FIG. 3) from these component supply units 6 are transferred to the printed circuit board W on the conveyor 5. And a component transfer section 8 to be mounted.

  The component transfer unit 8 is arranged on the left and right (both sides in the X direction) on the base 4 and extends between the pair of guide rails 9 and 9 and extends to the guide rails 9. A support member 10 supported so as to be movable in the Y direction, a ball screw type Y-direction drive device 11 for driving the support member 10, and a head unit 12 supported on the support member 10 so as to be movable in the X direction. And an X-direction drive device (not shown) for moving the head unit 12 in the X direction.

  The head unit 12 includes a plurality of suction heads 3. The suction nozzle 1 according to the present embodiment is attached to the lower ends of these suction heads 3 and is moved in the vertical direction by the suction head 3 and is rotated around the vertical axis. The suction head 3 is connected to a pneumatic control device 60 (shown schematically only in FIG. 3). The air pressure control device 60 has a configuration in which air is sucked from an air passage formed in the suction nozzle 1 when a component is sucked, and pressurized air is supplied into the air passage when the component is mounted. The suction head 3 and the pneumatic control device 60 constitute a pneumatic control system 70 (shown schematically only in FIG. 3). By supplying pressurized air or negative pressure air to the suction nozzle 1 described in detail below by the air pressure control system 70, the surface mounter 2 mounts the electronic component P sucked by the suction nozzle 1 on the printed circuit board W. It is configured as follows.

  The surface mounting machine as described above can employ various types of suction nozzles according to the present invention. Hereinafter, each embodiment of the suction nozzle will be described.

(First embodiment)
2 (A) and 2 (B), the suction nozzle 1 according to the first embodiment is formed in a cylindrical shape, and one end side forms a part of the pneumatic control system 70 (see FIG. 1). ), And a nozzle body 22 held by the nozzle holder 21. The nozzle holder 21 is attached to the lower end of the nozzle holder 21 so as to protrude downward. Further, the suction nozzle 1 includes a pin 23 (see FIG. 2B) for restricting the rotation of the nozzle body 22 relative to the nozzle holder 21 and the amount of movement in the vertical direction. A clip member 24 for preventing the release and a compression coil spring 25 as an urging member for urging the nozzle body 22 downward (in a direction protruding from the nozzle holder 21) are provided.

  The nozzle holder 21 is a cylindrical body made of stainless steel, and concentrically forms an air passage 26 that opens to the upper end side and a fitting hole 27 that opens to the lower end side continuously from the lower portion of the air passage 26. ing.

  The functional member includes a head portion 31 located at the upper end portion, an upper cylindrical portion 32 depending on the lower surface of the head portion 31, an upper flange portion 33 bulging at the lower end of the upper cylindrical portion 32, and an upper side thereof. A clip mounting groove 34 positioned below the flange portion 33, a lower flange portion 35 positioned below the clip mounting groove 34, and a lower cylindrical portion 36 projecting downward from the lower flange portion 35. Contains.

  The head portion 31 engages with a clamp member (not shown) provided on the suction head 3 (see FIG. 1). In the example of illustration, the external appearance which turned the polygonal column body formed in the irregular polygon cross section into the horizontal direction is exhibited.

  The cylindrical portion 32 is a cylindrical body that hangs down directly from the longitudinal central portion of the head portion 31.

  The upper flange portion 33 is an annular flange body that bulges substantially concentrically with the tubular portion 32. The upper flange portion 33 forms a clip mounting groove 34 in which a clip member 24 described later is disposed between the upper flange portion 33 and the lower flange portion 35 formed below. The clip member 24 is restricted from moving in the vertical direction by the two flange portions 33 and 35.

  The clip mounting groove 34 provides a mounting position for the clip member 24 used to prevent the pin 23 from coming off. The height and width of the clip mounting groove 34 (width in the front-rear and left-right directions of the nozzle holder 21) are formed to dimensions sufficient for the clip member 24 to be fitted, and both the flange portions 33, 35 are The clip member 24 is restricted from moving up and down.

  The pin 23 passes through a pin hole 37 communicating with the clip mounting groove 34 and is fixed to the nozzle holder 21, and is arranged along a direction perpendicular to the direction of the center line O of the fitting hole 27. . That is, the pin 23 is disposed along the horizontal direction so as to be orthogonal to the center line O.

  The pin hole 37 is formed along the one chord direction in the cross section of the nozzle holder 21, and the pin 23 extends along the one chord direction with respect to the center line O of the fitting hole 27. It is fixed in an orthogonal posture (see FIG. 6A). As a result, the pin 23 inserted into the pin hole 37 is formed so as to intersect with the fitting hole 27 of the nozzle holder 21 at the central portion in the longitudinal direction. That is, the pin 23 inserted into the pin hole 37 is supported by the nozzle holder 21 so as to cross the fitting hole 27 of the nozzle holder 21. Thus, the central portion in the longitudinal direction of the pin 23 inserted into the pin hole 37 is exposed in the fitting hole 27.

  The clip member 24 is formed by forming a linear body made of spring steel into a generally C shape that fits into the clip mounting groove 34, and elastically expands both end portions thereof to attach the clip. By fitting in the groove 34, the clip 23 is locked in the clip mounting groove 34 in a state of surrounding both ends of the pin 23 inserted in the pin hole 37. When attached to the clip attachment groove 34, the clip member 24 binds the clip attachment groove 34 (nozzle holder 21) by its elasticity. By attaching the clip member 24 to the clip attachment groove 34 in this way, the opening portion of the pin hole 37 is closed by the clip member 24, so that the pin 23 can be prevented from coming off the pin hole 37 and falling off. .

  Further, the clip member 24 can be removed from the clip mounting groove 34 by expanding both end portions of the clip member 24 with a jig or the like.

  The lower flange portion 35 serves as a background of the electronic component P when the electronic component P (see FIG. 3) sucked by the suction nozzle 1 is imaged by the component recognition camera 13 from below. The lower flange portion 35 according to this embodiment is formed in a disc shape. The lower flange portion 35 constitutes a light shielding flange. In this embodiment, an upper end portion of a compression coil spring 25 described later is brought into contact with the lower surface of the lower flange portion 35.

  An upper end portion of a compression coil spring 25 as an urging member is disposed on the outer periphery of the lower cylindrical portion 36 provided below the lower flange portion 35 in the nozzle holder 21. keeping. The compression coil spring 25 urges the nozzle body 22 downward so that the nozzle body 22 described below protrudes from the nozzle holder 21.

  Next, the nozzle body 22 will be described with reference to FIGS.

  The nozzle body 22 includes a cylindrical shaft member 41 that is movably fitted in a fitting hole 27 formed on the other end side of the nozzle holder 21, and a lower end of the shaft member 41. And a nozzle tip 42 provided on the surface. The shaft member 41 is an example of a base end portion that is slidably fitted into the fitting hole 27 of the nozzle holder 21. Further, the nozzle chip 42 is an example of a tip portion on which a component suction surface 42 a that sucks the electronic component P is formed.

  The shaft member 41 is formed of a stainless steel cylinder having an air passage 46 inside as a whole. In the following description, in the axial direction of the shaft member 41, the side connected to the nozzle holder 21 is a base end side, and the opposite side is a front end side. The shaft member 41 includes a cylindrical fitting cylinder 43 fitted into the fitting hole 27, a disc 44 provided at the tip of the fitting cylinder 43, and a nozzle protruding from the disc 44 toward the tip side. And a bottomed cylinder 45 for chip attachment.

  As shown in FIGS. 4A and 4B, the fitting cylinder 43 is formed so as to be movably fitted into the fitting hole 27 of the nozzle holder 21. Moreover, as shown in FIG. 3, FIG. 4 (A) (B), in the outer peripheral part at the said one end part side in this cylinder 43 for fitting, the flat notch surface 48 which is an example of the engaging part said by this invention. Is formed. In the first embodiment, the notch surface 48 constitutes an engagement surface that defines the stroke S of the shaft member 41 in cooperation with the pin 23 by making line contact with the pin 23.

  In the stroke S, the position at which the nozzle body 22 protrudes to the lowest side (hereinafter referred to as “stroke bottom end S1”) is defined by the upper end 48a (see FIG. 5) of the cutout surface 48. In the stroke S, the position at which the nozzle body 22 retracts to the uppermost side (hereinafter referred to as “stroke uppermost end S2”) is defined by the lower end 48b (see FIG. 5) of the cutout surface 48. Since the stroke bottom end S1 directly affects the operation accuracy of the suction nozzle 1, its tolerance is set to be relatively strict. On the other hand, since the stroke uppermost end S2 can be defined by other factors, its tolerance is set relatively moderately.

  The notch surface 48 is formed to cross the outer peripheral portion by a flat surface along a single string in the cross section of the fitting cylinder 43 at a certain depth. That is, the notch surface 48 is formed outside the air passage 46 formed in the nozzle body 22. As shown in FIGS. 4 (A) and 4 (B), the depth of the cut surface 48 is formed such that the pin 23 inserted into the pin hole 37 of the nozzle holder 21 can be engaged. In this embodiment, about half of the radial direction of the pin 23 exposed in the fitting hole 27 is engaged with the notch surface 48.

  Further, the groove length Lg (vertical length shown in FIG. 3) of the notch surface 48 is set to a dimension that allows the nozzle body 22 to move up and down by a predetermined stroke S with respect to the nozzle holder 21. ing. That is, the nozzle body 22 is vertically moved between a position where the pin 23 contacts the upper end 48a (see FIG. 5) of the notch surface 48 and a position where the pin 23 contacts the lower end 48b (see FIG. 5) of the notch surface 48. Can move in the direction. For this reason, when the pin 23 is engaged with the notch surface 48, the pin 23 is in line contact with the groove width Wg of the notch surface 48 (see FIG. 6A), and the nozzle body 22 is preset. The stroke S allows the nozzle body 21 to move relative to the nozzle holder 21 along the direction of the center line O of the fitting hole 27, and the nozzle body 22 rotates relative to the nozzle holder 21 around the center line O. The nozzle body 22 is connected to the nozzle holder 21 so as to restrict the movement.

  Furthermore, on the outer periphery of the fitting cylinder 43, at least one (in the first embodiment, five) annular grooves 101 to 105 are formed. The annular grooves 101 to 105 are all continuous along the outer periphery of the fitting cylinder 43 (in other words, along the circumferential direction of the fitting hole 27). It is formed at intervals. Among the plurality of annular grooves 101 to 105, some (annular grooves 101 to 104) communicate with the notch surface 48. Specifically, a first annular groove 101 continuing to the upper end 48a of the cutout surface 48 and a second annular groove 104 continuing to the lower end 48b are formed, and a plurality of ( For example, two (2) annular grooves 102 and 103 are formed. With this setting, the upper and lower end portions of the cutout surface 48 are smoothly continuous with the bottom portions of the corresponding annular grooves 101 and 104 without any step, and are not easily affected by burrs.

  Further, in the present embodiment, a third annular groove 105 is formed at a portion that is deviated downward from the notch surface 48.

  Referring also to FIG. 5, the advantage of forming the annular grooves 101 to 104 communicating with the cutout surface 48 as described above is that the influence of the burr 90 on the cutout surface 48 can be reduced as much as possible.

  In order to improve the processing accuracy, the nozzle body 22 according to the present embodiment employs a process of forming a notch surface 48 after joining with the nozzle tip 42 and finely adjusting the stroke length of the nozzle body 22. . Therefore, when the shaft member 41 is formed, the annular grooves 101 to 105 are first formed by lathe processing, and then, after the nozzle tip 42 is bonded, the cut surface 48 is formed by polishing using a grindstone or the like. Burr 90 of about 5 μm to 10 μm is likely to be generated on the outer edge (particularly the upper end 48 a and the lower end 48 b). In particular, the upper end 48a of the notch surface 48 is a part that defines the stroke bottom end S1 of the nozzle body 22 (see FIG. 4A), and is a part with severe tolerance, and the lower end 48b of the notch face 48 is also This is a part that defines the stroke bottom end S2 of the nozzle body 22 (see FIG. 4B). Therefore, in the conventional process, in order to maintain the operation accuracy of the nozzle body 22 at a required level, the upper end 48a and the lower end 48b of the notch surface 48 are polished by a router or the like.

  On the other hand, in the present embodiment, as described above, the annular groove 101 communicating with the upper end 48a of the notch surface 48 and the annular groove 104 communicating with the lower end 48b are formed in advance, so that the burr 90 is annular. The burr 90 can be released from the contact surface without falling into the grooves 101 and 104 and performing the deburring operation.

  Next, the groove widths (cross-sectional dimensions of the annular grooves along the center line O) Wr1 to Wr3 of the annular grooves 101 to 105 are set to three types in the illustrated example.

  First, since the three annular grooves 101 to 103 including the first annular groove 101 communicate with the notch surface 48, the contact accuracy between the pin 23 and the notch surface 48 may be affected. There is. Therefore, the groove width Wr1 of the annular grooves 101 to 103 is set to a narrow dimension (for example, 0.3 mm) as much as possible so as not to affect the contact accuracy between the pin 23 and the notch surface 48.

  Next, the second annular groove 104 communicating with the lower end 48 b of the notch surface 48 hardly affects the contact accuracy between the notch surface 48 and the pin 23. Therefore, the groove width Wr2 of the second annular groove 104 is set to a dimension (for example, 1.0 mm) wider than the three annular grooves 101 to 103.

  Further, the third annular groove 105 formed below the notch surface 48 (a position deviated from the notch surface 48) does not affect the contact accuracy at all. Therefore, the groove width Wr3 of the third annular groove 105 is set to a dimension (for example, 1.2 mm) wider than the annular groove 104 communicating with the lower end 48b of the notch surface 48.

  As described above, the groove width Wr1 of the annular grooves 101 to 103 that may affect the contact accuracy between the pin 23 and the notch surface 48 is set as narrow as possible, so that the contact accuracy between the pin 23 and the notch surface 48 is increased. On the other hand, the groove widths Wr2 and Wr3 of the second and third annular grooves 104 and 105 are set wider than the annular grooves 101 to 103, whereby the nozzle body 22 ( The contact area between the fitting cylinder 43) and the fitting hole 27 is reduced to suppress the influence of friction or the like.

  Next, referring to FIG. 6, the groove depth Dr1 of each of the annular grooves 101 to 103 communicating with the notch surface 48 is shallower than the groove depth Dr3 of the annular grooves 104 and 105 (see FIG. 6B). The dimension is set (for example, 0.05 mm).

  With reference to FIGS. 6A to 6C, the advantage of reducing the groove depth Dr1 of the annular grooves 101 to 104 will be described.

  First, as shown in FIG. 6A, the pin 23 is in a line contact state with the groove width Wg of the notch surface 48 in the part where the annular groove 101 is not formed among the parts where the notch surface 48 is formed. In contact. The contact length at this time has the same dimension as the groove width Wg. In addition, the gap is set so that the gap between the fitting hole 27 and the nozzle body 22 is small, and the rotation range α at the portion where the pin 23 is in line contact with the notch surface 48 is, for example, 7 Set to °.

  Next, as shown in FIG. 6B, for example, in the portion of the annular groove 102, the length in which the pin 23 comes into contact with the notch surface 48 is shortened by the annular groove 102. As described above, the groove depth Dr1 of the annular grooves 101 to 103 directly affects the effective contact length in which the pin 23 and the notch surface 48 come into contact. Therefore, in the present embodiment, as described above, the annular grooves 101 to 103 By setting the cross-sectional area to be small, the effective contact length is secured as short as possible, and the rotation range β in which the nozzle body 22 rattles around the axis in the fitting hole 27 is suppressed within, for example, 8 °. . If the cross-sectional area of the annular groove 102 or the like is set large as the groove depth Dr3 of the annular groove 105 formed in the lowermost part (that is, the annular groove 102 has been formed up to the position indicated by the broken line in FIG. 6B). ), The rotation range γ becomes considerably large (for example, γ = 12 °), and there is a possibility that the accuracy to be achieved by the suction nozzle 1 cannot be sufficiently maintained. Therefore, in the present embodiment, as described above, among the annular grooves 101 to 104 communicating with the cutout surface 48, the annular grooves 101 to 103 including at least the first annular groove 101 are the other annular grooves 104 and 105. The groove depth Dr1 is set smaller than that.

  On the other hand, for the second annular groove 104 at a position communicating with the lower end 48 b of the cut-out surface 48, the nozzle body 22 is less likely to rattle due to the relationship with the pin 23. Further, with respect to the third annular groove 105 located at a position deviated from the notch surface 48, the rattling is not affected at all. Therefore, for these second and third annular grooves 104 and 105, as shown in FIG. 6C, the groove depth Dr3 is set as large as possible, and the nozzle body 22 (the fitting cylinder 43). The contact area between the contact hole 27 and the fitting hole 27 is reduced to suppress the influence of friction or the like.

  Referring to FIGS. 4A and 4B again, the disc 44 of the shaft member 41 functions as a spring seat that receives the lower end portion of the compression coil spring 25. The outer diameter of the disc 44 is formed to be larger than the fitting cylinder 43 and the lower cylindrical portion 36 of the nozzle holder 21.

  The compression coil spring 25 is in a state in which the fitting cylinder 43 of the nozzle body 22 is inserted into the lower fitting hole 27 of the nozzle holder 21, in other words, the lower cylindrical portion 36 of the nozzle holder 21 and the nozzle body 22. It is arranged in a state where an initial load is applied between the disc 44 and the lower flange portion 35 in a state of being located outside the fitting cylinder 43. Thus, by arranging the compression coil spring 25 between the nozzle holder 21 and the nozzle body 22, the nozzle body 22 is biased in a direction protruding downward from the nozzle holder 21.

  The nozzle chip 42 is formed of a ceramic material, and the tip of the nozzle body 22 that adsorbs the electronic component P is formed by firmly bonding the ceramic material to the tip of the bottomed cylinder 45 with an adhesive. Configure. The nozzle body 22 forms a component suction surface 42a (see FIGS. 2A and 2B and FIGS. 4A and 4B) to be joined to the electronic component P. An air passage 47 is formed in the nozzle tip 42 so as to penetrate from the lower end to the upper end of the nozzle tip 42 and open to the component suction surface 42a. The nozzle tip 42 may be a super steel material formed with an industrial diamond. In that case, the super steel material is brazed to the tip of the bottomed cylinder 45.

  The air passage 47 includes an air passage 46 in the shaft member 41, an air passage 26 (see FIGS. 2A and 2B) formed of a hollow portion in the nozzle holder 21, and an air passage in the suction head 3. (Not shown) is connected to an air pressure control device 60 constituting the air pressure control system 70.

  Next, procedures for disassembling and assembling the suction nozzle 1 according to this embodiment will be described. In order to assemble the suction nozzle 1, first, the compression coil spring 25 is mounted on the outer periphery of the shaft member 41 of the nozzle body 22, and the compression coil spring 25 is placed on the disk 44 of the nozzle body 22. At this time, the compression coil spring 25 may be fitted to and held by the lower cylindrical portion 36 of the nozzle holder 21.

  Then, the shaft member 41 of the nozzle body 22 is fitted into the fitting hole 27 of the nozzle holder 21. The upper end portion of the compression coil spring 25 is fitted into the lower cylindrical portion 36 of the nozzle holder 21 when the shaft member 41 is inserted into the fitting hole 27.

  Thereafter, the nozzle body 22 is moved in the axial direction with respect to the nozzle holder 21 and rotated so that the notch surface 48 of the nozzle body 22 overlaps the pin hole 37 of the nozzle body 22, and the pin 23 is inserted into the pin hole 37. To do.

  Then, the clip member 24 is attached to the clip mounting groove 34 of the nozzle holder 21. By attaching the clip member 24 to the nozzle holder 21 in this manner, the assembling work of the suction nozzle 1 is completed.

  In the suction nozzle 1 assembled in this way, the nozzle body 22 can be moved upward relative to the nozzle holder 21 by pushing the nozzle body 22 upward against the elastic force of the compression coil spring 25. it can.

  For this reason, when the nozzle chip 42 contacts the electronic component P and pushes it from above when the electronic component P is sucked by the suction nozzle 1, the nozzle body 22 resists the elastic force of the compression coil spring 25. The impact is mitigated by moving upward with respect to the nozzle holder 21. This buffering action works similarly when the electronic component P sucked by the suction nozzle 1 is mounted on the printed board W.

  On the other hand, in order to disassemble the suction nozzle 1, a procedure reverse to the above-described assembly procedure is performed. That is, first, the clip member 24 is removed from the nozzle holder 21, and the pin 23 is extracted from the pin hole 37. In order to remove the pin 23 from the pin hole 37, the pin 23 is a thin rod-like member that is pushed into one opening of the pin hole 37 to protrude from the other opening, and the protruding portion of the pin 23 is gripped and pulled. By doing.

  After removing the pin 23 in this manner, the disassembly operation of the suction nozzle 1 is completed by pulling out the nozzle body 22 from the nozzle holder 21.

  In addition, foreign matter may adhere to the inside of the suction nozzle 1 when used for a long period of time. In such a case, conventionally, the suction nozzle 1 is disassembled to clean individual parts, or cleaning is performed using a cleaning tool (not shown) without disassembling.

  However, in the present embodiment, the annular grooves 101 to 105 are formed on the outer periphery of the nozzle body 22 (the fitting cylinder 43 constituting the shaft member 41). Therefore, foreign matters such as wear debris and wear debris are collected in the annular grooves 101 to 105, so that a smooth advance / retreat operation can be realized over a long period of time without maintenance.

  Next, the result of the test which this inventor implemented about 1st Embodiment is demonstrated.

(Test results)
Test objects shown in FIGS. 7A to 7C were prepared as test objects.

  FIG. 7A shows a conventional example corresponding to a conventional configuration in which an engagement surface 201 is provided on a cylindrical member 200 made of stainless steel.

  FIGS. 7B and 7C show Examples 1 and 2 in which a plurality of annular grooves are provided on the outer periphery of the cylindrical member 200, respectively. In the first embodiment, three annular grooves 210 to 212 are provided on the outer periphery of the cylindrical member 200, and the sizes of the annular grooves 210 to 212 are set to be the same. On the other hand, in Example 2, six annular grooves 220 to 215 are provided on the outer periphery of the cylindrical member 200, and the groove widths of the annular grooves 220 to 223 communicating with the engagement surface 201 are set to be relatively narrow. The annular groove 225 located away from the surface 201 has a mode in which the groove width is set wider.

  Ten each of these three types of test products were prepared, and the operation test was performed 3 million times for each test product. In the operation test, whether or not the part corresponding to the nozzle body protrudes from the nozzle holder to the proper position when the electronic component P is picked up under the same conditions as the actual product and the component is mounted and then returned to the free state. The number of times N when sliding failure (protrusion failure) occurred was counted.

  Table 1 shows the test results of each test product.

  In the conventional example (the test product in FIG. 7A), the number of occurrences of sliding failure was 36436, so the sliding failure occurrence rate was 0.121%. Although this numerical value is extremely excellent, even better results were obtained in Examples 1 and 2 (each test product in FIGS. 7B and 7C).

  First, in Example 1, since the number of occurrences of sliding failure was 2868, the occurrence rate of sliding failure was 0.010%. In Example 2, since the number of occurrences of sliding failure was 153, the sliding failure occurrence rate was 0.001%.

Therefore, when the number of sliding failures occurring in the conventional example is set as the reference value Ns and the number of sliding failures occurring in each of the embodiments 1 and 2 is set as N, the sliding reduced by each of the embodiments 1 and 2 is reduced. The ratio of the number of malfunctions (Ns-N) to the reference value Ns
Improvement rate = {(Ns−N) / Ns} × 100 (1)
Then, the improvement rates of Examples 1 and 2 were 92.1% and 99.6%, respectively, and it was confirmed that the number of defective products occurring in the conventional product could be improved by 90% or more.

  Furthermore, the enlarged photograph of Example 2 at the time of implementing the above-mentioned test 16 million times is shown in FIG.8 and FIG.9.

  As shown in FIGS. 8A and 8B, the edge of the engagement surface 201 has a burr 90 formed at the time of polishing. However, since this burr 90 has entered the annular groove 220, it slides on the pin. Not in a moving position. Therefore, it was confirmed from the test results that good sliding characteristics were obtained without being affected by the burr 90.

  Further, as shown in FIGS. 9A and 9B, after the test, it is confirmed that foreign matters such as wear debris and wear debris generated during sliding are collected in the respective annular grooves 220 to 223. It was done. As described above, the foreign matter generated during use is collected in the annular grooves 220 to 223, so that the sliding operation can be performed at an extremely high improvement rate even in an environment where maintenance work and deburring work are omitted. It was confirmed that it was possible.

(Second embodiment)
The suction nozzle can be formed as shown in FIGS.

  10 and 11, the same or equivalent members as those described in the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

  In the suction nozzle 1 shown in FIGS. 10 and 11, a long hole 51 is used as an engaging portion on the nozzle body 22 side with which the pin 23 engages. That is, the shaft member 41 of the nozzle body 22 according to the second embodiment is formed with a long hole 51 that penetrates along the one diameter direction of the fitting cylinder 43 and whose long axis extends along the center line O direction. ing. The long hole 51 passes through the air passage 46 and is formed at a position corresponding to the pin hole 37 of the nozzle holder 21.

  Of the inner diameters of the long holes 51, the shorter diameter is formed so that the pin 23 is movably fitted, and the longer diameter is a length corresponding to the amount of movement of the nozzle body 22 relative to the nozzle holder 21. Is formed. That is, the nozzle body 22 can move in the vertical direction between a position where the pin 23 contacts the upper end of the long hole 51 (see FIG. 11) and a position where the pin 23 contacts the lower end of the long hole 51. . In the second embodiment, the long hole 51 (specifically, the surface of the long axis portion of the long hole 51) is in line contact with the pin 23, so that the stroke of the shaft member 41 cooperates with the pin 23. S, the engagement bottom surface which defines the stroke bottom end S1 and the stroke top end S2.

  For example, a plurality of (at least one) annular grooves 110 are also formed in the shaft member 41 constituting the nozzle body 22 of FIGS. 10 and 11. The annular groove 110 is formed at a position where a part thereof communicates with the long hole 51.

  The long hole 51 also manufactures the shaft member 41 having the annular groove 110 and fixes the nozzle tip 42 (here, “fixed” refers to bonding when formed of a ceramic material, In the case of being formed of super steel material, it means brazing.) Then, it is formed by drilling. Both end portions in the longitudinal direction of the long holes 51 are continuous with the corresponding annular grooves 110, and burrs formed on the periphery of the long holes 51 are released to the corresponding grooves 110.

  Even if the engaging portion on the nozzle body 22 side is formed by the long hole 51 in this way, the same effect as that of the first embodiment is obtained.

  As described above, according to the above-described embodiments, the annular grooves 101 to 105 and 110 that are continuous along the circumferential direction of the fitting hole 27 are formed, so that the fitting hole 27 and the nozzle body 22 Foreign matter that may be generated between the fitting cylinder 43 is easily collected in the annular grooves 101 to 105 and 110. Therefore, even if the fitting cylinder 43 of the nozzle body 22 is fitted into the fitting hole 27 with a very small tolerance and used over a long period of time, foreign matters such as wear debris and wear debris generated over time are not removed. The sliding contact surface between the nozzle body 22 and the fitting hole 27 is hardly affected, and the sliding operation of the nozzle body 22 can be maintained smoothly.

  The number of the annular grooves 101 to 105, 110 may be at least one, but a plurality of grooves are preferably formed. In forming a plurality of annular grooves, it is preferable that at least one of the annular grooves (101 to 104) communicate with the notch surface 48. Further, the one communicating with the notch surface 48 preferably includes a first annular groove (101) communicating with the upper end 48a of the notch surface 48 and a second annular groove (104) communicating with the lower end 48b. .

  Each embodiment further includes a pin 23 disposed along a direction perpendicular to the center line O direction of the fitting hole 27, and the pin 23 is disposed on the outer peripheral surface of the fitting cylinder 43 in the center line O direction. A notch surface 48 or a long hole 51 is formed as a flat engagement surface that slides on the annular groove 101, and the annular grooves 101 to 105, 110 are formed at positions communicating with the notch surface 48 or the long hole 51. For this reason, in each embodiment mentioned above, the nozzle body 22 is connected to the fitting hole 27 by connecting the pin 23 and the notch surface 48 or the pin 23 and the long hole 5 so as to slide in the center line O direction. It is allowed to move relative to the nozzle holder 21 along the center line O direction. In particular, as shown in each embodiment, when the notch surface 48 or the long hole 51 as the engagement surface defines the stroke bottom end S1 or the stroke top end S2, the nozzle body 22 slides. The range can be positioned more accurately, and the operation reliability can be improved. Moreover, the nozzle body 22 is connected to the nozzle holder 21 so as to be restricted from rotating relative to the nozzle holder 21 around the center line O, and performs a projecting operation and a contracting operation. As a result of this operation, foreign matter such as wear debris and wear debris generated between the pin 23 and the notch surface 48 is caused by the annular grooves 101 to 105, 110 from the communication portion between the annular grooves 101 to 105, 110 and the notch surface 48. Efficiently collected. In addition, since the annular grooves 101 to 105 and 110 are formed at positions where they communicate with the cutout surface 48, the burr 90 generated when the cutout surface 48 is processed after the formation of the annular grooves 101 to 105 and 110 is removed. 101-105, 110 can be escaped. Therefore, it is possible to obtain a fitting structure with good slidability without performing post-processes such as removing the burr 90.

  In the first embodiment, the annular grooves 101 to 105 communicating with the notch surface 48 have at least the upper end 48a of the notch surface 48 (the notch surface 48 defines the stroke lowermost end S1, that is, the lowermost end of the nozzle body 22). A first annular groove 101 communicating with the notch surface 48 or the portion of the long hole 51 as an engaging surface. For this reason, in the first embodiment, it is possible to eliminate the influence of the burr 90 that directly affects the stroke bottom end S <b> 1 of the nozzle body 22 having a severe dimensional tolerance.

  In the first embodiment, the annular grooves 101 to 104 communicating with the notch surface 48 are provided at the lower end 48b of the notch surface 48 (the engagement surface that defines the stroke uppermost end S2, that is, the uppermost end of the nozzle body 22). And a second annular groove 104 that communicates with the cutout surface 48 or the long hole 51. For this reason, even when the part that defines the stroke uppermost end S2 of the nozzle body 22 is formed in the notch surface 48 or the long hole 51 as in the first embodiment, the influence of the burr 90 that may occur in the part is eliminated. be able to.

  In the first embodiment, the second annular groove 104 is set to have a groove width Wr2 larger than those of the other annular grooves 101 to 103 communicating with the notch surface 48. For this reason, in each of the above-described embodiments, rattling of the nozzle body 22 that occurs in relation to the pin 23 occurs in the second annular groove 104 formed in a portion that has a relatively low influence on the forward / backward movement of the nozzle body 22. Since it is difficult to occur, the groove width Wr2 is set as large as possible. As a result, the contact area between the nozzle body 22 and the fitting hole 27 can be reduced, and the influence of friction or the like can be suppressed.

  In the first embodiment, the annular grooves 101 to 105 further include third annular grooves 101 to 105 formed at positions deviated from the notch surface 48, and the annular grooves 101 to 104 communicated with the notch surface 48. Among them, those including at least the first annular groove 101 (annular grooves 101 to 103) have a groove depth Dr <b> 1 shallower than that of the third annular groove 105. For this reason, in the first embodiment, when the annular grooves 101 to 104 are communicated with the notch surface 48, it is possible to reduce the line contact length at least with respect to the portion given to the line contact length between the pin 23 and the notch surface 48. Therefore, it is possible to obtain a connecting structure with little backlash.

  In the first embodiment, the third annular groove 105 has a groove width Wr3 larger than the annular grooves 101 to 104 communicating with the notch surface 48. For this reason, in 1st Embodiment, the contact area can be reduced as much as possible, ensuring the contact state of the fitting hole 27 and the cylinder 43 for fitting. For this reason, the sliding accuracy of the nozzle body 22 can be improved, and a highly reliable sliding performance can be maintained over a long period of time.

  Further, the suction nozzle 1 according to each of the above-described embodiments includes a step of measuring a cylindrical metal member to form the shaft member 41 having the annular grooves 101 to 105, and bonding the nozzle tip 42 to the tip of the shaft member 41. A step of fixing by brazing, and a step of forming a notch surface 48 or a long hole 51 in the vicinity of the fitting cylinder 43 of the shaft member 41 to which the nozzle tip 42 is fixed. It is manufactured by a manufacturing method formed at a position communicating with the surface 48 or the long hole 51. Therefore, in each of the above-described embodiments, the notch surface 48 or the long hole 51 is formed after the nozzle tip is fixed to the shaft member 41 in advance, so that the dimensional accuracy of the notch surface 48 or the long hole 51 at the time of finishing becomes high. , Improve product yield. In addition, since the annular grooves 101 to 105 and 110 are formed in the shaft member 41 in advance, the annular grooves 101 to 105 and 110 are also formed at positions where the annular grooves 101 to 105 and 110 communicate with the notch surface 48 or the long hole 51. Burrs generated when the cut surface 48 or the long hole 51 is formed can be released into the annular grooves 101 to 105 and 110. As a result, even if the deburring operation is omitted, it is possible to manufacture the nozzle body 22 having extremely good sliding characteristics.

  Further, as shown in the above-described embodiment, the influence of the burr 90 can be eliminated as much as possible by forming the groove depth Dr1 of the annular grooves 101 to 103 communicating with the notch surface 48 at the time of manufacture as shallow as possible. And the deburring step can be omitted.

  The present invention is not limited to the embodiment described above, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

  For example, the suction nozzle 1 can be applied to applications other than the surface mounter, for example, various devices that pick up the electronic component P by an air pressure adjustment system such as a component inspection device.

  Moreover, the connection structure of the nozzle holder 21 and the nozzle body 22 is not limited to the structure of the pin 23 and the cutout surface 48, and may be a connection structure of a key groove and a key, for example. Further, the pin 23 is not limited to a circular cross section as exemplified in each embodiment, and may have a polygonal cross section. However, as exemplified in each embodiment, when the pin 23 having a circular cross section is employed, the pin 23 can be brought into rolling contact with the notch surface 48, which is more preferable.

  Further, when the backlash is allowed, the groove width of the annular groove is one that communicates with the engagement surface and one that deviates from the engagement surface as shown in the first embodiment (see FIG. 7B). And may be set to the same dimension.

  The groove width of the second annular groove 104 is the same as the groove width Wr1 of the other annular grooves 101 to 103 communicating with the engagement surface, as shown in the second embodiment (see FIG. 7C). May be set.

  Further, the clip member 24 may be not only a linear body but also a plate material made of spring steel.

DESCRIPTION OF SYMBOLS 1 Adsorption nozzle 2 Surface mounting machine 3 Adsorption head 21 Nozzle holder 22 Nozzle main body 23 Pin 27 Fitting hole 41 Shaft member 42 Nozzle tip (an example of front-end | tip part)
43 Cylinder for fitting (example of base end)
48 Notch surface (example of engagement surface)
51 Long hole 60 Pneumatic control device 70 Pneumatic control system 90 Burr 101-105, 110 Annular groove O Center line P Electronic component S Stroke S1 Stroke bottom end (bottom end)
S2 Lowermost stroke end (uppermost end)
Dr Groove depth W Printed circuit board Wr Groove width

Claims (8)

A nozzle holder attached to the pneumatic control system and having a fitting hole;
In a suction nozzle comprising: a base end portion slidably fitted in the fitting hole; and a nozzle body including a tip end portion on which a component suction surface 42a for sucking an electronic component is formed.
An annular nozzle that is continuous along the circumferential direction of the fitting hole is formed in the base end portion of the nozzle body. The suction nozzle according to claim 1,
A pin disposed along a direction perpendicular to the center line direction of the fitting hole;
On the outer peripheral surface of the base end portion, a flat engagement surface on which the pin slides in the center line direction is formed,
The said annular groove is formed in the position connected with the said engagement surface. The suction nozzle characterized by the above-mentioned. The suction nozzle according to claim 2,
The suction nozzle, wherein the annular groove communicating with the engagement surface includes at least a first annular groove communicating with a portion of the engagement surface defining at least a lowermost end of the nozzle body. The suction nozzle according to claim 3.
The suction nozzle, wherein the annular groove communicating with the engagement surface further includes a second annular groove communicating with a portion of the engagement surface defining the uppermost end of the nozzle body. The suction nozzle according to claim 4,
The suction nozzle, wherein the second annular groove is set to have a larger groove width than other annular grooves communicating with the engagement surface. The suction nozzle according to any one of claims 3 to 5,
The annular groove further includes a third annular groove formed at a position disengaged from the engagement surface, and among the annular grooves communicating with the engagement surface, at least the first annular groove includes The suction nozzle, wherein the groove depth is set to be shallower than that of the third annular groove. The suction nozzle according to any one of claims 1 to 6,
A suction head that holds a nozzle holder of the suction nozzle, and
A surface mounting machine configured to mount an electronic component sucked by the suction nozzle on a printed circuit board. A nozzle body including a proximal end portion slidably fitted in a fitting hole of the nozzle holder and a distal end portion on which a component suction surface 42a for sucking an electronic component is formed, and constituting a suction nozzle together with the nozzle holder In the manufacturing method of
Measuring a cylindrical metal member to form a shaft member having an annular groove; and
Fixing the nozzle tip to the tip of the shaft member after processing the annular groove;
Forming an engagement surface on which a pin fixed to the nozzle holder slides in the vicinity of the base end portion of the shaft member to which the nozzle tip is fixed, and
The method for manufacturing a nozzle body, wherein the annular groove is formed at a position communicating with the engagement surface.

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