JP3089622B2 - How to attach the reflector to the suction nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a reflector on a suction nozzle of an electronic component mounting apparatus.

[0002]

2. Description of the Related Art In recent years, in an electronic component mounting apparatus for sucking electronic components such as chips using a suction nozzle and mounting the electronic components on an electronic circuit board, a displacement or the like of the electronic component sucked by the suction nozzle is detected. In order to correct the mount position based on this value, an electronic device that has been sucked by the suction nozzle is imaged by an imaging device.

At this time, a reflector made of a synthetic resin, which is larger than the electronic component to be sucked, is attached to the base of the suction nozzle in order to make the electronic component sucked by the suction nozzle stand out from therearound and to obtain a contrast. Often. Light is applied from a predetermined position, and the light is reflected by the reflector, whereby a contrast is obtained between the reflector and the electronic component.

[0004] Conventionally, the reflector is attached to the suction nozzle by bonding as shown in FIG. That is, a reflector 51 made of a synthetic resin having a predetermined shape is fixed to a metal suction nozzle 52 by applying an adhesive between their contact surfaces 53 and fixing the two.

[0005] In some cases, it is formed by injection molding using a mold. That is, as shown in FIG. 9, in a state where the nozzle pipe 56 is inserted into the root portion 55 of the suction nozzle, this is set in a mold in which the cavity of the reflector is formed, and then the reflector 57 is formed by injection molding. In some cases, it is integrated with a metal suction nozzle.

[0006]

However, when an adhesive is used, it is very difficult to accurately determine the amount of the adhesive to be applied. If the amount is small, sufficient adhesion cannot be achieved, and the amount is too large. If it is too long, it protrudes from the adhesive surface 53 and adheres to other parts, and it is necessary to remove the adhesive adhered to the other parts, which requires a lot of time and labor.

In the case where the both are fixed using an adhesive, the suction nozzle is mounted on a nozzle head (not shown), and mounting of the electronic component on the substrate by the suction nozzle is repeated at a high speed. In addition, there has been a problem that the adhesive surface 53 is peeled off due to repeated vibrations and the like, the reflector 51 turns around, and the reflector 51 comes off from the suction nozzle 52.

Next, when integrally forming the reflector by injection molding, a predetermined position of the suction nozzle 55 is engraved, and molding resin is wrapped around this portion 55a to prevent the reflector 57 from coming off. However, during injection molding, the nozzle pipe 56 is bent or the like due to a high temperature and a change in the temperature to a normal temperature, and the concentricity between the reflector 57 and the tip surface of the nozzle pipe 56 is significantly deteriorated. There was a point.

In addition, when the reflector is integrally formed by injection molding, unevenness occurs on the front end surface 57a of the reflector, and the planar accuracy is deteriorated as compared with the case of the cutting process. There is a problem that inconvenience occurs in image processing.

Therefore, an object of the present invention is to provide a reflector 57
In order to keep the concentricity of the tip end face of the nozzle pipe 56 and the flatness of the tip end face of the reflector high, the reflector is separately manufactured and fixed to the suction nozzle. It is an object of the present invention to provide a reflector mounting method for a suction nozzle, which is easy and does not cause the reflector to turn or come off once the mounting operation is performed once it is fixed.

[0011]

Means for Solving the Problems To achieve the above object, a reflector mounting method for a suction nozzle according to the present invention comprises:
An object of the present invention is to form a slanted and wedge-shaped raised portion by knurling on a cylindrical surface on which a reflector of an attraction nozzle of an electronic component mounting device is fitted, and then press-fit the reflector along the cylindrical surface.

The knurling may be performed at the corners of the knurl by obliquely applying a flat knurl.

[0013]

The reflector is press-fitted into the slope-shaped and wedge-shaped raised portion from the side where the slope is descended. Then, the reflector is pushed along the slope of the raised portion, and can be easily pushed into a predetermined position. Then, in this state, the raised portion is hardly fitted into the reflector, so that the reflector is prevented from coming off or rotating.

A flat knurl is applied obliquely, and knurling is applied to the corners of the knurl, whereby a slope-shaped and wedge-shaped raised portion can be easily formed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 2, the suction nozzle 1 includes an inner nozzle (a suction nozzle base) 1a and a nozzle pipe (a suction pipe) 1b, both of which are formed of metal. The inner nozzle 1a has an intake hole formed in the axial direction (not shown) to secure a reflector mounting portion 1c to be described later, and a cylindrical thick portion 1c inside the reflector mounting portion 1c.
d is formed (see FIG. 1). In the thick part 1d,
A pin 1f for attaching the suction nozzle 1 to a nozzle head (not shown) is attached. The mounting portion 1c of the reflector has a cylindrical surface, to which knurling described later is applied. The nozzle pipe 1b has an intake hole formed in the axial direction (not shown) so that an electronic component such as a chip is adsorbed on the tip surface 1e. After penetrating the nozzle pipe 1b into the inner nozzle 1a, the inner nozzle 1a and the nozzle pipe 1b are fixed to each other using a silver solder or the like.

In FIG. 3, the reflector 2 is formed by injection molding and is a semi-transparent synthetic resin molded product, and its tip surface 2a has a high degree of flatness by cutting. In addition, a concave portion 2b that fits with the mounting portion 1c of the suction nozzle 1 is formed in the rear portion. The inner diameter of the concave portion 2b is substantially equal to the outer diameter of the cylindrical surface of the mounting portion 1c. In addition, a hole 2c used for a jig hole or the like when the suction nozzle is attached to the nozzle head is provided at the tip portion.
It is provided in the place.

As shown in FIG. 4, a flat knurl 3 is used as the knurl. The teeth 3a parallel to the axial direction of the knurl are formed at equal pitches on the outer peripheral surface of the cylinder.

Next, the process of the embodiment will be described.

In FIG. 5, the suction nozzle 1 is attached to a main shaft of a lathe (not shown). Also, the knurl 3 is attached to the tool post of the lathe. In addition, the knurl 3 is inclined at a predetermined angle θ, for example, 4 ° 30 ′, in a state of being opened toward the tip of the nozzle pipe 1b. In this state, the corner 3b of the knurl 3 is attached to the mounting portion 1c of the suction nozzle 1.
And knurling is performed by the corner 3b. The contact position is set so that a constant interval is maintained between the thick portion 1d and the contact position. This is because, as will be described later, when a force in the detaching direction acts on the reflector, the resin portion of the reflector between the thick portion 1d and the contact position thereof is a portion that resists the detachment.

Then, as shown in FIG. 6, the mounting portion 1c
The part subjected to knurling causes plastic deformation. That is, a wedge-shaped protruding portion 1g having a slope-shaped and wedge-shaped protruding portion 1g, that is, a slope-shaped protruding portion extending to the crest portion 1j, and having a reduced width toward the crest portion 1j is generated.
At the same time, between the raised portions 1g, there is formed a concave portion 1h whose width becomes wider and deeper as it proceeds to the position of the crest portion 1j of the raised portion 1g.

Next, as shown in FIG.
Is press-fitted along the cylindrical surface 1c of the suction nozzle from the side where the slope of the raised portion is descending, that is, from the nozzle pipe 1b side. Then, the concave portion 2b of the reflector 2 becomes the raised portion 1g.
Is pushed in until the rear surface 2d hits the thick portion 1d (FIG. 7). At this time, since the reflector is press-fitted from the side where the slope is descended, the reflector can be pushed along the slope of the raised portion, easily climb up, and can be pushed into the predetermined position with a small force.

In this state, the raised portion 1g enters the reflector 2 made of a synthetic resin, so that the reflector cannot hit the rear surface 1i (see FIG. 6) of the raised portion and cannot escape. According to the experiment, the force (pull-out force) in the pull-out direction requires a force of about 8 to 11 kg, and a result that can withstand an extremely large pull-out force is obtained. Will not be able to rotate. Furthermore, since the rear surface 2d of the reflector is in contact with the thick portion 1d, the reflector 2 cannot move in the press-fit direction.

Suction nozzle 1 to which reflector 2 is fixed
Is mounted on the nozzle head and positioned in the nozzle head by the pin 1f. Then, in the mounting operation, the electronic component such as a chip is vacuum-sucked at the position of the component supply unit by the distal end face 1e of the nozzle pipe 1b, and in this state, while the electronic component is being transported to a predetermined position on the substrate, the reflector and The chip is irradiated with light, the electronic component is imaged, and the image processing detects a displacement of the electronic component with respect to the nozzle pipe. At this time, the concentricity between the reflector and the tip surface of the nozzle pipe is high precision,
Also, because the flatness of the reflector surface 2a is high precision,
High-accuracy imaging and position shift detection are possible. When the displacement is detected, the value of the displacement is corrected, and the electronic component is conveyed to a predetermined position on the substrate and mounted. This operation is repeatedly performed to mount the substrate. As described above, the reflector 2 is fixed to the suction nozzle by biting into the protruding portion 1g, so that the reflector 2 may rotate or fall out of the suction nozzle even when subjected to repeated vibrations or the like. This does not occur and the mounting operation can be continued with high efficiency.

In the present invention, the formation of the raised portion 1g by knurling can be easily performed by using a lathe or the like, and the subsequent work is only to press-fit the reflector 2 into the mounting portion 1c of the suction nozzle. Therefore, the total work time and cost required for mounting the reflector on the suction knurl are extremely small. Also, as described above, once press-fitted, the fixing force is extremely large. Therefore, this mounting method is a very advantageous mounting method.

In the above embodiment, the knurling operation is performed by the inner nozzle 1a to which the nozzle pipe 1b is already fixed.
However, when the inner nozzle 1a is manufactured by a lathe, the knurling operation can be performed at the same time when the inner nozzle 1a is manufactured.
May be fixed.

In the above embodiment, the flat knurls in which the eyes 3a are formed in the axial direction are used. However, the eyes are formed in an oblique direction with respect to the axial direction. Knurling is performed by attaching a knurl so that the eyes of the part are parallel to the axial direction of the member to be knurled. The flat knurl is also inclined, of course, so as to hit only the corners, and the slope-shaped and wedge-shaped protrusions are formed. It can be formed.

Further, in the above embodiment, a flat knurl is obliquely applied and knurling is performed at its corners, but various other knurls can be used for knurling. For example, it is possible to form only the corners of a flat knurl that is difficult to fit into the cylindrical surface 1c of the suction nozzle on the cylindrical outer peripheral surface of a plain knurl independently as eyes, and perform knurling using this knurl. Good.

The knurls whose eyes are cut in parallel are obliquely applied to the cylindrical surface of the member to be fixed.
The method of applying knurling, pressing the fixing member along the cylindrical surface on which the knurling is applied, and fixing the fixing member to the fixed member is not limited to the case of the suction nozzle and the reflector,
It can be used as a fixing method between various fixing members and a fixed member. Even in these cases, the total time and cost required for the fixing operation are extremely small, and a large fixing force can be obtained.

[0030]

As described above, the mounting method of the present invention
Extremely easy work. In addition, the fixing force is extremely strong against vibration and the like, and it is possible to prevent the reflector from turning or coming off during the mounting operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a reflector is pressed into a suction nozzle.

FIG. 2 is a plan view of the suction nozzle before knurling.

3A is a plan view of the reflector, and FIG. 3B is a front view of the reflector.

FIG. 4A is a plan view of a flat knurl, and FIG. 4B is a front view thereof.

FIG. 5 is a plan view showing a state in which knurling is applied to the suction nozzle.

FIG. 6 is an enlarged view of a main part of a suction nozzle provided with knurling.

FIG. 7 is a plan view showing a state where the reflector is pressed into the suction nozzle.

FIG. 8 is a plan cross-sectional view showing a state in which a suction nozzle and a reflector are fixed by bonding in the related art.

FIG. 9 is a plan sectional view showing a state in which a reflector is formed on a suction nozzle by conventional injection molding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suction nozzle 1c Cylindrical surface 1g Raised part 2 Reflector 3 Knurl 3b Knurl corner

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 13/04 B23P 21/00 305

Claims (2)

(57) [Claims] An inclined wedge-shaped raised portion is formed by knurling on a cylindrical surface on which a reflector of a suction nozzle of an electronic component mounting device is fitted. Next, the reflector is moved along the cylindrical surface. A method for mounting a reflector of a suction nozzle, characterized by press-fitting. 2. The method according to claim 1, wherein the knurling is performed by obliquely applying a flat knurl and using a corner thereof.