JP2009002475A - Direct acting guide mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct acting guide mechanism capable of preventing the vibration from occurring resulting from the wear occurring between a rolling body and a raceway. <P>SOLUTION: A metallic material forming a raceway mounting portion 5, 5 is selected so that the rigidity (Young's modulus) of a metallic material forming the raceways mounting portion 5, 5 comprising a second frame is lower than the rigidity (Young's modulus) of a metallic material (steel material) forming a traverse beam 3 comprising a first frame. The raceway mounting portion 5, 5 mounted by the raceway 6 is softened compared to the traverse beam 3 to apt to bend. As a result, when the vibration occurs, the raceway mounting portion 5, 5 functions properly to absorb the vibration. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a linear motion guide mechanism used for a purpose of moving a beam such as a molded product take-out machine.

Japanese Patent Laid-Open No. 2001-38778 (Patent Document 1) and Utility Model Registration No. 3000168 (Patent Document 2) show an example of a linear motion guide mechanism used for the purpose of moving a beam of a molded product take-out machine. Has been. This linear motion guide mechanism is supported by a metal track attached to the traverse beam and a drawing beam (base member) that moves forward and backward along the traverse beam, and is rotatably supported by a plurality of rolls that roll on the trajectory. It has a moving body. The transverse beam includes a first frame and a second frame that is fixed to the first frame and extends in the same direction as the direction in which the first frame extends. A track is attached to the second frame. A rolling element that rolls on the track is rotatably supported by the extraction beam that moves forward and backward along the second frame.
JP 2001-38778 A Utility Model Registration No. 3000168

  In the conventional linear motion guide mechanism, the first and second frames are both made of steel. However, when the linear motion guide mechanism is used for a long period of time, the gap between the rolling element raceway and the rolling element supported by the base member becomes large due to wear generated between the rolling element and the raceway. As a result, vibration is generated. This vibration not only affects the movement of the linear motion guide mechanism but also causes noise. Conventionally, however, this vibration is considered to be lost unless the worn parts are replaced, and the generation of vibrations is left until the parts are replaced.

  An object of the present invention is to provide a linear motion guide mechanism that can suppress the occurrence of vibrations caused by wear generated between a rolling element and a track.

  The linear motion guide mechanism to be improved by the present invention includes a first frame, a second frame fixed to the first frame and extending in the same direction as the direction in which the first frame extends, A track attached to the frame, and a rolling element that is rotatably supported by a base member that moves forward and backward along the second frame and rolls on the track. In this specification, the term “rolling” includes both the case where the rotating body rotates around the axis and the case where the sphere rotates. At least one rolling element is used for one track, but usually two or more rolling elements are used for one track. The structure of the rolling element is arbitrary.

  When the rolling element rolls repeatedly on the raceway and wear occurs between them, and the gap between the two becomes large, vibration occurs due to the gap. However, in the present invention, the second frame is mounted so that the rigidity (Young's modulus) of the metal material forming the second frame is lower than the rigidity (Young's modulus) of the metal material forming the first frame. The metal material to be formed is selected. Therefore, the second frame on which the track is mounted is softer than the first frame and is easy to bend. As a result, when the vibration described above occurs, the second frame functions to absorb this vibration. That is, when vibration is transmitted to the second frame, the second frame also vibrates when viewed macroscopically and absorbs this vibration energy. As a result, vibration can be suppressed. In order to suppress vibration, when the Young's modulus of the metal material forming the first frame is 50 GPa (gigapascal) to 90 GPa (gigapascal), the Young's modulus of the metal material forming the second frame is , 180 GPa (gigapascal) to 220 GPa (gigapascal) is preferable. This is because if the difference between the rigidity of the first frame and the rigidity of the second frame becomes extremely large, the second frame may vibrate greatly due to the resonance phenomenon, and the vibration may increase.

  In the case where the first frame is integrally formed of a steel material, the present invention can be easily realized if the second frame is integrally formed of an aluminum material.

  According to the present invention, the second frame is mounted so that the rigidity (Young's modulus) of the metal material forming the second frame is lower than the rigidity (Young's modulus) of the metal material forming the first frame. Since the metal material to be formed is selected, when vibration is generated due to the gap between the rolling element and the track, the second frame functions to absorb this vibration. As a result, an advantage that vibration can be suppressed is obtained.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing a molded product take-out machine 1 and a resin molding machine 2 provided with a linear motion guide mechanism targeted by the present invention. FIG. 2 is an enlarged view showing an example of the main part of the linear motion guide mechanism provided in the molded product take-out machine. FIG. 3 is an enlarged view showing the relationship between the track of the linear motion guide mechanism and the rolling elements. 1 and 2, the molded product take-out machine 1 moves the extraction beam 4 in the direction indicated by the arrow X along the transverse beam 3 made of a steel material mounted on a mounting portion 2A of an injection molding machine (resin molding machine) 2. Move back and forth. A main take-out mechanism of the molded product take-out machine 1 is mounted on the drawing beam 4. As shown in FIG. 2, the linear motion guide mechanism for reciprocating the extraction beam 4 in the direction of the arrow X is a pair of plate-like track mounting portions 5 made of aluminum material fixed to the upper surface of the transverse beam 3. 5 is provided. In the present embodiment, the traversing beam constitutes the first frame, and the orbit mounting portion 5 constitutes the second frame. The track mounting portions 5 and 5 extend along the transverse beam 3 and are actually bolted onto the transverse beam 3 as shown in FIG. On the upper and lower surfaces of the track mounting portions 5, 5, columnar tracks 6, 6 each having a circular cross-sectional shape are fixed so as to face each other in the thickness direction of the track mounting portion 5. Orbit 6 has a Rockwell hardness of 59-60? It is made of hardened steel. As shown in FIG. 3, the track 6 is fixed in a state in which the cross-sectional shape formed in the track mounting portion 5 is fitted in an elongated groove 7 having a semicircular arc shape.

  As shown in FIG. 2, a base member 8 is fixed to the lower part of the extraction beam 4. The base member 8 includes a pair of vertical wall portions 9, 9 extending along both side surfaces of the transverse beam 3. A plurality of spiral holes 10 and 11 are formed in the vertical wall portions 9 and 9 at intervals in the vertical direction. These through holes are provided as many as the number of rolling elements 12 to be used. In the present embodiment, eight rolling elements 12 roll on one track 6. The eight rolling elements 12 are arranged in a row in the X direction. A bolt member 13 whose tip portion constitutes a shaft member of the rolling element 12 is screwed into the spiral holes 10 and 11.

  In the present embodiment, as shown in FIG. 3, the rolling element 12 rotates outside the inner ring 14 via an inner ring 14 fitted to the tip of the bolt member 13 and a rolling element 15 such as a sphere. A ball bearing type rolling element provided with an outer ring 16 is used. An annular groove 17 into which the track 6 is fitted is formed on the outer peripheral surface of the outer ring 16.

  When the rolling element 12 repeatedly rolls on the track 6 and wear occurs between the two, and the gap between the two becomes large, vibration is generated due to the gap. However, in the present embodiment, the rigidity (Young's modulus) of the metal material (aluminum material) that forms the track mounting portions 5 and 5 that constitute the second frame is used to form the transverse beam 3 that constitutes the first frame. The metal material forming the track mounting portions 5 and 5 is selected so as to be lower than the rigidity (Young's modulus) of the metal material (steel material). Therefore, the track mounting portions 5 and 5 to which the track is mounted are softer than the transverse beam 3 and are easily bent. As a result, when the vibration described above occurs, the track mounting portions 5 and 5 function to absorb this vibration. That is, when vibration is transmitted to the track mounting portions 5 and 5, the track mounting portions 5 and 5 also vibrate macroscopically and absorb this vibration energy. As a result, vibration can be suppressed. In order to suppress vibration, when the Young's modulus of the steel material forming the transverse beam 3 is 50 GPa (gigapascal) to 90 GPa (gigapascal), the Young's modulus of the aluminum material forming the track mounting portions 5 and 5 is used. Is preferably set to a value in the range of 180 GPa (gigapascal) to 220 GPa (gigapascal). This is because if the difference between the rigidity of the traverse beam 3 and the rigidity of the track mounting portions 5 and 5 becomes extremely large, the track mounting portions 5 and 5 may vibrate greatly due to a resonance phenomenon, and the vibration may increase.

  The rolling elements of the above embodiment are radial ball bearing type rolling elements, but the present invention can of course be applied to other types of rolling elements.

  Further, in the above embodiment, the traverse beam 3 and the steel material are formed, and the track mounting portions 5 and 5 are formed of an aluminum material, but the trajectory is higher than the rigidity (Young's modulus) of the metal material forming the traverse beam 3. If the relationship that lowers the rigidity (Young's modulus) of the metal material forming the mounting portions 5 and 5 is established, the transverse beam 3 and the track mounting portions 5 and 5 may be formed of other materials. Of course.

  The configurations of the invention described in this specification will be listed below.

(1) a first frame (transverse beam);
A second frame (orbit mounting portion) fixed to the first frame (transverse beam) and extending in the same direction as the direction in which the traverse beam extends;
A track attached to the second frame (track mounting portion);
A linear motion guide mechanism comprising a rolling element that is rotatably supported by a base member that moves forward and backward along the second frame (track mounting portion) and rolls on the track.
A linear motion guide mechanism characterized in that the rigidity of the metal material forming the second frame (track mounting portion) is lower than the rigidity of the metal material forming the first frame (transverse beam).

(2) The rigidity of the second frame is a vibration generated due to a gap formed between the contact surface of the rolling element and the track when the rolling element rolls on the track. The linear motion guide mechanism according to the above (1), which is set to allow the second frame to be deformed so as to suppress the deformation.

(3) When the Young's modulus of the metal material forming the first frame is 50 GPa (gigapascal) to 90 GPa (gigapascal), the Young's modulus of the metal material forming the second frame is 180 GPa ( The linear motion guide mechanism according to the above (2), characterized in that it is in the range of (Giga Pascal) to 220 GPa (Giga Pascal).

(4) The linear motion guide mechanism according to (1) or (2), wherein the first frame is integrally formed of a steel material, and the second frame is integrally formed of an aluminum material.

It is the perspective view which decomposed | disassembled and showed the molded article extraction machine 1 and the resin molding machine 2 provided with the linear motion guide mechanism which this invention makes object. It is an enlarged view which shows an example of the principal part of the linear guide mechanism provided in the molded article extraction machine. It is an enlarged view which shows the relationship between the track | orbit of a linear motion guide mechanism, and a rolling element.

1 Mold take-out machine 2 Injection molding machine 3 Traverse beam (first frame)
4 Extraction beam 5 Track mounting part (second frame)
6 Track 7 Groove 8 Base member 9 Vertical wall portion 10, 11 Spiral hole 12 Rolling element 13 Bolt member 14 Inner ring 15 Rolling element 16 Outer ring

Claims (1)

A first frame;
A second frame fixed to the first frame and extending in the same direction as the direction in which the first frame extends;
A track attached to the second frame;
A linear motion guide mechanism comprising a rolling element that is rotatably supported by a base member that moves forward and backward along the second frame and rolls on the track,
A linear motion guide mechanism, wherein a rigidity of a material forming the second frame is lower than a rigidity of a material forming the first frame.