JP4510276B2 - Head linear motion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a head linear motion device used for electronic component mounting, assembly, inspection, conveyance, and the like.
[0002]
[Prior art]
A conventional head linear motion device will be described with reference to FIGS. FIG. 5 is a cross-sectional view of the support frame of the conventional head linear motion device, FIG. 6 is a front view of the support frame of the conventional head linear motion device, and FIG. 7 is the heat of the support frame of the conventional head linear motion device. FIG. 8 is a plan view showing displacement due to deformation, and FIG. 8 is a cross-sectional view showing displacement due to thermal deformation of a support frame of a conventional head linear motion device.
[0003]
As shown in FIG. 5, the support frame 1 made of aluminum has iron linear motion guide rails 2a and 2b on the upper and lower sides, and linear sliding bearings 3a and 3b that move along the linear motion guide rails 2a and 2b. Have Reference numeral 4 denotes a support table fixed to the upper and lower linear sliding bearings 3a and 3b, and a head 5 which is an object to be operated is attached to the support table 4. A component suction nozzle 10 is attached to the head 5. The support frame 1 is provided with a motor 6 and a ball screw 7 that converts the rotation of the motor 6 into a linear motion. The support frame 1 is fixed to an apparatus body such as an electronic component mounting apparatus by left and right support portions 8.
[0004]
In the above configuration, when the motor 6 is rotated, the ball screw 7 converts the rotational motion into a linear motion, and the table 4 attached to the linear sliding bearings 3a and 3b is caused to linearly move along the linear motion guide rails 2a and 2b. The head 5 is positioned at a predetermined coordinate.
[0005]
[Problems to be solved by the invention]
In such a conventional head linear motion device, when the operation is started from the stop state of the head 5, the linear motion guide rails 2a and 2b generate heat due to friction with the linear sliding bearings 3a and 3b. Here, the material of the support frame main body 1 is aluminum, the material of the linear motion guide rails 2a and 2b is iron, and the two materials are different. The amount of thermal deformation in the longitudinal direction of the guide rails 2a and 2b is different. Then, as shown in FIG. 7, the support frame body 1 is slightly curved in the horizontal plane, and displacement in the Y direction occurs.
[0006]
Further, as shown in FIG. 8, a temperature difference occurs between the upper linear motion guide rail 2a and the lower linear motion guide rail 2b in the vertical plane. This is because the lower linear motion guide rail 2b is heavier than the upper linear motion guide rail 2a and the frictional force is increased accordingly. In this case, a difference in the amount of displacement in the Y direction between the upper linear guide rail 2a and the lower linear guide rail 2b occurs, and the support table 4 is tilted, causing the head 5 to be displaced. There is a problem that.
[0007]
An object of the present invention is to provide a support frame shape that is not affected by thermal deformation even if the support frame and the linear motion guide rail are made of different materials.
[0008]
[Means for Solving the Problems]
The above object of the present invention is achieved by the following configurations.
(1) A support table to which a head is attached, a support frame disposed along the linear movement direction of the head, and provided on the support frame, while supporting the load of the head and the support table, In a head linear motion apparatus comprising linear sliding bearings and linear motion guide rails that reciprocally guide the support table along the support frame, and drive means for driving the support table along the linear motion guide rails,
A head linear motion device, comprising: a reinforcing plate for reducing thermal deformation of the support frame on a back side of the support frame on the side where the guide rail is provided.
[0009]
(2) The head linear motion device according to (1), wherein the reinforcing plate is made of the same material as the linear motion guide rail.
[0010]
(3) The head linear motion device according to (1), wherein the reinforcing plate has a linear expansion coefficient equal to that of the linear motion guide rail.
[0011]
(4) A pair of guide rails are provided on the upper and lower sides, the reinforcing plate is provided corresponding to each guide rail, and the cross-sectional area of the reinforcing plate corresponding to the lower guide rail is the upper guide rail. 4. The head linear motion device according to any one of (1) to (3), wherein the head linear motion device is larger than a cross-sectional area of the reinforcing plate corresponding to the rail.
[0012]
In the present invention, a reinforcing plate made of the same material as that of the linear motion guide rail for reducing thermal deformation is preferably provided on the back surface of the support frame, and the upper and lower cross-sectional shapes are differentiated in proportion to the amount of deformation. Thereby, the thermal deformation of the support frame due to heat generation during the operation of the head linear motion device can be reduced.
[0013]
The head in the present invention includes a component suction head for mounting an electronic component on a substrate, an application head for applying an adhesive for bonding the electronic component to the substrate, an assembly jig, and an inspection device. A jig, a conveying jig, and the like can be cited, and these can be employed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view of a support frame of a head linear motion device according to an embodiment of the present invention, FIG. 2 is a front view of the support frame of the head linear motion device according to an embodiment of the present invention, and FIG. It is a rear view of the support frame of the head linear motion apparatus of one Embodiment of invention.
[0015]
As shown in FIG. 1, the support frame 1 made of aluminum has iron linear motion guide rails 2a and 2b on the upper and lower sides, and linear sliding bearings 3a and 3b that move along the linear motion guide rails 2a and 2b. Have Reference numeral 4 denotes a support table fixed to the upper and lower linear sliding bearings 3a and 3b, and a head 5 which is an object to be operated is attached to the support table 4. A component suction nozzle 10 is attached to the head 5. The support frame 1 is provided with a motor 6 and a ball screw 7 that converts the rotation of the motor 6 into a linear motion. The support frame 1 is fixed to an apparatus body such as an electronic component mounting apparatus by left and right support portions 8.
[0016]
Iron reinforcement plates 9a and 9b made of the same material as the linear motion guide rails 2a and 2b are attached to the upper and lower sides of the support frame 1 on the side opposite to the head mounting side (hereinafter referred to as the front side) (hereinafter referred to as the back side). ing. The basic configuration of the present embodiment is the same as the conventional configuration described above, and is different from the conventional configuration in that the reinforcing plates 9a and 9b are provided.
[0017]
In the above configuration, when the motor 6 is rotated, the ball screw 7 converts the rotational motion into a linear motion, and the support table 4 attached to the linear sliding bearings 3a and 3b moves linearly along the linear motion guide rails 2a and 2b. Thus, the head 5 is positioned at a predetermined coordinate.
[0018]
Here, since the reinforcing plates 9a and 9b are attached to the back side of the support frame 1, the linear motion guide rails 2a and 2b are caused by heat generated by sliding with the linear sliding bearings 3a and 3b at the beginning of movement. The deformation of the support frame 1 is prevented. The reinforcing plates 9a and 9b are formed to have different cross-sectional shapes or cross-sectional areas corresponding to the difference in displacement between the upper and lower linear motion guide rails 2a and 2b. That is, the rigidity of the reinforcing plate 9 is changed by changing the cross-sectional shape or cross-sectional area.
[0019]
Of the upper and lower linear motion guide rails 2a and 2b, the lower linear motion guide rail 2b acts more in weight than the upper linear motion guide rail 2b, and the frictional force with the linear sliding bearings 3a and 3b is larger. Therefore, the amount of heat generation is increased accordingly. Therefore, the amount of thermal deformation of the support frame 1 due to heat generation is larger in the lower part than in the upper part.
[0020]
Therefore, among the reinforcing plates 9a and 9b attached to the support frame 1, the lower reinforcing plate 9b is set to have higher rigidity than the upper reinforcing plate 9a. As a result, the lower reinforcing plate 9b has a greater deformation preventing ability than the upper reinforcing plate 9a.
[0021]
As described above, according to the present embodiment, the reinforcing plates 9a and 9b made of the same material as the linear motion guide rails 2a and 2b are attached to the back side of the support frame 1, and the upper and lower reinforcing plates 9a and 9b are attached to the upper and lower straight plates. By making a difference between the cross-sectional shapes of the cross-sectional areas proportional to the displacement difference between the moving guide rails 2a and 2b, it is possible to reduce misalignment due to thermal displacement.
[0022]
The cross-sectional areas of the reinforcing plates 9a and 9b are set so that the bending moment of the support frame 1 becomes zero. Considering a C-shaped cross-sectional shape of the support frame 1 as shown in FIG. 4, the moment M for bending the support frame 1 is
M = α1, T1, E1, S1, r1-α2, T2, E2, S2, r2
α: linear expansion coefficient T: rising temperature E: Young's modulus S: cross-sectional area r: distance from the main axis
[0023]
Here, if the materials of the linear motion guide rails 2a and 2b and the reinforcing plates 9a and 9b are the same, α1 = α2 and E1 = E2. Further, since the temperature distribution difference is small in the same cross section, it can be considered that T1 = T2. Therefore, the above equation is M = α1 · T1 · E1 (S1 · r1−S2 · r2)
It becomes.
[0024]
Therefore, if S2 and r2 are set so that S1 · r1−S2 · r2 = 0, the bending moment of the support frame 1 can be reduced to zero.
[0025]
When the reinforcing plates 9a and 9b having the cross-sectional areas as described above are provided, the deformation amount of the support frame 1 can be reduced to about 1/5 compared with the conventional case.
[0026]
The reinforcing plates 9a and 9b may be made of a material having the same linear expansion coefficient even if it is a different material from the linear motion guide rails 2a and 2b.
[0027]
【The invention's effect】
As described above, according to the head linear motion device of the present invention, the linear motion guide during operation is provided by providing the reinforcing plate for reducing the thermal deformation of the support frame on the side opposite to the support table mounting side of the support frame. Even if the rail generates heat, the support frame is not deformed and the head can be accurately positioned.
[0028]
In addition, by forming the reinforcing plate with the same material as the linear guide rail and making the upper and lower reinforcing plates have a cross-sectional shape proportional to the difference in displacement between the upper and lower linear guide rails, Positional displacement due to displacement can be reduced.
[0029]
In addition, the reinforcing plate is formed of a material having the same linear expansion coefficient as that of the linear motion guide rail, and the cross sectional area is differentiated so that the upper and lower reinforcing plates have a cross sectional shape proportional to the displacement difference between the upper and lower linear motion guide rails. As a result, it is possible to reduce misalignment due to thermal displacement.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a support frame of a head linear motion device according to an embodiment of the present invention.
FIG. 2 is a front view of a support frame of the head linear motion device according to the embodiment of the present invention.
FIG. 3 is a rear view of the support frame of the head linear motion device according to the embodiment of the present invention.
FIG. 4 is a diagram illustrating a bending moment of a support frame.
FIG. 5 is a cross-sectional view of a support frame of a conventional head linear motion device.
FIG. 6 is a front view of a support frame of a conventional head linear motion device.
FIG. 7 is a plan view showing displacement due to thermal deformation of a support frame of a conventional head linear motion device.
FIG. 8 is a cross-sectional view showing displacement due to thermal deformation of a support frame of a conventional head linear motion device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support frame 2a, 2b Linear motion guide rail 3a, 3b Linear sliding bearing 4 Support table 5 Head 6 Motor 7 Ball screw 8 Support part 9a, 9b Reinforcement board 10 Component adsorption nozzle

Claims (3)

A support table to which the head is attached; a support frame disposed along the linear movement direction of the head; and the head and the support table provided on the support frame while supporting a load on the head and the support table. A linear motion bearing and a linear motion guide rail that reciprocally guides the support table along the support frame, and a drive linear device that drives the support table along the linear motion guide rail.
A reinforcing plate for reducing thermal deformation of the support frame is provided on the back side of the support frame where the guide rail is provided ,
A pair of the guide rails are provided on the upper and lower sides, the reinforcing plate is provided corresponding to each of the guide rails, and the cross-sectional area of the reinforcing plate corresponding to the lower guide rail corresponds to the upper guide rail. The head linear motion device is characterized in that it is larger than the cross-sectional area of the reinforcing plate .   The head linear motion device according to claim 1, wherein the reinforcing plate is made of the same material as the linear motion guide rail.   The head linear motion device according to claim 1, wherein the reinforcing plate has a linear expansion coefficient equal to that of the linear motion guide rail.

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