JP6069145B2 - High pressure twist molding machine - Google Patents

Description

  The present invention relates to a high-pressure twist molding machine. More particularly, the present invention relates to a high-pressure twist molding machine for refining a material by a high-pressure twist method.

  Crystal refinement means that a polycrystalline body such as a metal is subjected to physical force or heat treatment to break up and subdivide crystal grains. By refining crystal grains, mechanical properties such as strength and ductility can be improved. There is a strong strain processing method as a method for crystal refinement. The strong strain processing method is a method of physically dividing and subdividing crystal grains by applying a very large strain that cannot be applied by ordinary plastic processing.

  Typical high strain processing methods include High Pressure Torsion (HPT), Equal Channel Angular Pressing (ECAP), Accumulative Roll Bonding (ARB), and multi-axis forging. (MDF: Multi Directional Forging) is known. Among them, the high-pressure twisting method is a method of applying a shear stress by twisting deformation while applying a compressive stress to a material (for example, Patent Document 1).

JP 2006-247734 A

  Generally, a high-pressure twist molding machine for refining a material by a high-pressure twist method has a pair of molds that sandwich the material, and a pressure cylinder that applies pressure to one mold side is provided. The other mold is rotated. The mold on the rotation side is provided on the frame via a thrust bearing, and is configured to be able to rotate in a state of receiving pressure applied by a pressure cylinder. However, thrust bearings cannot withstand large pressures. Therefore, the conventional high-pressure twist molding machine is small, and there is no large molding machine having a pressure of several hundred tons or more.

  In view of the above circumstances, an object of the present invention is to provide a high-pressure twist molding machine that can apply a high pressure to a material.

A high-pressure twist molding machine according to a first aspect of the present invention includes a pair of molds sandwiching a material, a cylindrical portion, and a sliding portion that is slidable within the cylindrical portion, and a pressure cylinder that applies compressive stress to the material. A rotating means for rotating the sliding portion to apply shear stress to the material, a frame having a crown, a bed, and an upright, and following the sliding of the sliding portion with respect to the frame A slide that slides and rotatably supports the sliding portion , wherein one of the pair of molds is fixed to the sliding portion, and the cylindrical portion is The sliding part is rotatably supported while being fixed to a frame, and the rotating means is provided concentrically with the center of rotation of the sliding part, the main gear provided on the sliding part, A pinion gear meshing with the main gear, and the pinion gear fixed to the slide Characterized in that it comprises a motor for rotating the gears, the.
High twist molding machine of the second invention is the first invention, characterized in that it comprises a slide guide for limiting the inclination of the slide.
A high-pressure twist molding machine according to a third aspect of the present invention is characterized in that, in the first or second aspect , a plurality of the pinion gears are provided at equiangular intervals around the main gear.

According to the first invention, since one mold can be rotated by rotating the sliding portion by the rotating means, a thrust bearing for supporting the mold is unnecessary, and a high pressure can be applied to the material. Further, since the cylinder portion is fixed to the frame and does not rotate, the weight on the rotating side can be reduced as compared with the case where the entire pressure cylinder is rotated. Furthermore, one mold can be rotated by rotating a sliding part by the drive of a motor . Since rotation means is a simple structure, it can be a whole compact.
According to the second invention, since the slide is restricted so as not to be inclined, even if an eccentric load is applied to the mold, the inclination of the mold is limited, so that the eccentric load performance is good.
According to the third invention, since the pinion gears are provided at equal angular intervals around the main gear, it is possible to prevent the axial center of the sliding portion from shifting. Therefore, it is possible to prevent the mold from being displaced, and the processing accuracy is good.

It is a partial longitudinal cross-sectional view of the high-pressure twist molding machine which concerns on one Embodiment of this invention. It is the II-II arrow directional cross-sectional view in FIG. It is a partial longitudinal cross-sectional view of the pressurization state of the same high-pressure twist molding machine.

Next, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a high-pressure twist molding machine A according to an embodiment of the present invention includes a frame f including a crown 1, a bed 2, and four uprights 3 standing between them. have. The crown 1 is provided with a ram-shaped pressure cylinder 4. The pressure cylinder 4 has a cylinder tube 41 and a ram 42 that can slide in the cylinder tube 41. The cylinder tube 41 supports the ram 42 rotatably. A cylinder tube 41 is fixed to the crown 1. The cylinder tube 41 and the ram 42 correspond to “cylinder part” and “sliding part” described in the claims, respectively. In addition to the hydraulic cylinder, various cylinders can be used as the pressurizing cylinder 4.

  The high-pressure twist molding machine A includes a pair of molds 51 and 52 that sandwich the material M, that is, an upper mold 51 and a lower mold 52. The tip of the ram 42 of the pressure cylinder 4 is inserted through the through hole 61 of the slide 6, and the upper mold 51 is fixed to the tip of the tip. The upper mold 51 is attached with an in-row structure so as not to rotate with respect to the ram 42. The upper die 51 may be directly fixed to the ram 42, or may be indirectly fixed to the ram 42 via another member.

  On the other hand, a lower mold 52 is fixed to the upper surface of the bed 2. The lower mold 52 is attached with an in-row structure so as not to rotate with respect to the bed 2. The upper mold 51 and the lower mold 52 are respectively formed with concave accommodating portions 51a and 52a for accommodating the material M. By extending the pressurizing cylinder 4, the upper die 51 is lowered, and a pressure can be applied to the upper die 51. Thereby, compressive stress can be applied to the raw material M accommodated in the accommodating parts 51a and 52a.

  A rotation support member such as a bush or a radial bearing is provided between the through hole 61 of the slide 6 and the tip of the ram 42. The ram 42 is supported so as to be rotatable with respect to the slide 6 around a central axis parallel to the sliding direction. The slide 6 is configured to move up and down with respect to the frame f following the sliding of the ram 42. The clearance between the ram 42 and the slide 6 is minimized, and the ram 42 is restricted from tilting with respect to the slide 6.

  As shown in FIG. 2, a slide guide 62 is provided between the slide 6 and the upright 3. The slide guide 62 restricts the slide 6 so that it can move up and down along the upright 3 and does not rotate with respect to the frame f. Further, the clearance of the slide guide 62 is minimized, and is limited so that the slide 6 does not tilt with respect to the frame f.

  As described above, the ram 42 is restricted so as not to incline with respect to the slide 6, and the slide 6 is restricted so as not to incline with respect to the frame f. Even if this works, the inclination of the upper mold 51 is limited and can be kept horizontal. Therefore, the eccentric load performance is good and the processing accuracy of the material M is improved.

  Returning to FIG. On both the left and right sides of the crown 1, pull-back cylinders 7 are provided. A slide 6 is connected to the tip of the piston rod of the retracting cylinder 7. After the pressure cylinder 4 is extended and the slide 6 is lowered, the retracting cylinder 7 is contracted, so that the slide 6 can be raised and the pressure cylinder 4 can be contracted.

  The high-pressure twist molding machine A includes a rotating means 8 that rotates the ram 42 of the pressurizing cylinder 4 around its central axis. The rotating means 8 includes a main gear 81, a pinion gear 82, and a motor 83. The main gear 81 is provided along the outer periphery of the ram 42, and the axis (rotation center) of the ram 42 and the center of the main gear 81 are concentric. The main gear 81 is provided at a position above the slide 6 in the ram 42 and at a position protruding from the cylinder tube 41 even in the most contracted state of the pressure cylinder 4.

  The motor 83 is fixed to the upper part of the slide 6, and a pinion gear 82 is fixed to the drive shaft thereof. The pinion gear 82 is disposed at a position where it meshes with the main gear 81. Therefore, the upper mold 51 can be rotated by rotating the pinion gear 82 and the main gear 81 by driving the motor 83 and rotating the ram 42 about its central axis. In addition, as the motor 83, various motors other than a hydraulic motor and an electric motor can be used.

  As shown in FIG. 2, in this embodiment, two pinion gears 82 are provided. A motor 83 is provided for each of the two pinion gears 82. The two pinion gears 82 and 82 are provided around the main gear 81 at equiangular intervals (180 ° intervals). In other words, the two pinion gears 82 and 82 are disposed at symmetrical positions with the center of the main gear 81 (the axis of the ram 42) as the center.

  In addition to the tangential force that rotates the main gear 81, a normal force that separates them from each other is also applied between the main gear 81 and the pinion gear 82. This normal direction force causes the ram 42 and the slide 6 to be relatively displaced in the horizontal direction. In the present embodiment, since the two pinion gears 82 and 82 are provided at equal angular intervals around the main gear 81, the normal force is canceled and only the tangential force acts. Therefore, the axial center of the ram 42 can be prevented from shifting. As a result, the upper mold 51 can be prevented from being displaced in the horizontal direction with respect to the lower mold 52, and the processing accuracy of the material M is improved.

  Three or more pinion gears 82 may be provided. Even in this case, if the plurality of pinion gears 82 are provided at equal angular intervals around the main gear 81, the upper die 51 can be prevented from being displaced in the horizontal direction with respect to the lower die 52.

Next, the crystal refining process of the material M by the high-pressure twist molding machine A will be described.
First, as shown in FIG. 1, the material M is placed in the housing portion 52 a of the lower mold 52 with the pressure cylinder 4 pulled back. In general, the material M has a disk shape or a column shape. By making a hole in the center of the material M to make a donut shape or a cylindrical shape, the shear stress may be applied evenly.

  Next, as shown in FIG. 3, the pressure cylinder 4 is extended, and the material M is sandwiched between the upper mold 51 and the lower mold 52 to apply compressive stress. In this state, the motor 83 is driven and the upper mold 51 is rotated together with the ram 42, whereby the material M is twisted and deformed to apply a shear stress. Here, the ram 42 is rotatable with respect to the slide 6, and the slide 6 is restricted in rotation by the slide guide 62, so that the slide 6 does not rotate even if the ram 42 is rotated. Further, the slide 6 only moves up and down following the ram 42, and no pressure is applied by the pressure cylinder 4. Therefore, it is not necessary to support the applied pressure by the slide 6.

  From the above, a shear stress can be applied to the material M while applying a compressive stress, and crystal refinement by a high-pressure twisting method can be performed. Note that the rotation speed and the number of rotations of the upper mold 51 may be adjusted as appropriate. For example, the upper mold 51 is rotated 10 to 20 times at 1 rpm.

  After completion of crystal refining of the material M, the pressurizing cylinder 4 is contracted by the pull-back cylinder 7 and the material M is taken out.

  As described above, since the upper die 51 can be rotated by rotating the ram 42 itself by the rotating means 8, a thrust bearing for rotatably supporting the upper die 51 is unnecessary. Therefore, the high-pressure pressurizing cylinder 4 can be adopted, and a high pressure can be applied to the material M. Therefore, it can be set as a large sized molding machine whose applied pressure is several hundred tons or more. The present invention can be applied not only to a large molding machine but also to a small molding machine.

  Further, since the rotating means 8 has a simple structure, the entire high-pressure twist molding machine A can be made compact. Moreover, since a plurality of motors 83 are provided, a high shear stress can be applied with the small motor 83.

  Furthermore, since the cylinder tube 41 is fixed to the frame f and does not rotate, the weight on the rotating side can be reduced as compared with the case where the entire pressure cylinder 4 is rotated.

(Other embodiments)
The ram-type pressure cylinder 4 in the high-pressure twist molding machine A of the above embodiment may be replaced with a piston-type pressure cylinder 4. The piston rod of the pressure cylinder 4 corresponds to a “sliding portion” described in the claims. In this case, the main gear 81 of the rotating means 8 is provided on the piston rod of the pressure cylinder 4. The axis of the piston rod and the center of the main gear 81 are concentric. Even if the piston-type pressure cylinder 4 is used, the same effect as that of the above-described embodiment can be obtained. Since the piston-type pressure cylinder 4 can be lifted by itself, it is not necessary to provide the pull-back cylinder 7.

  In the high-pressure twist molding machine A of the above embodiment, the rotating means 8 may be provided below the slide 6. That is, the tip end portion of the ram 42 is configured to protrude below the slide 6, and the main gear 81 is provided at the protruding portion. A pinion gear 82 and a motor 83 are provided below the slide 6. Even with such a configuration, the same effects as those of the above-described embodiment can be obtained.

  Further, the upper die 51 may be fixed to the frame f, and the pressure cylinder 4 and the rotating means 8 may be provided on the lower die 52. Further, the pair of molds 51 and 52 may be arranged horizontally, and one mold 51 (52) may be slid in the horizontal direction.

DESCRIPTION OF SYMBOLS 1 Crown 2 Bed 3 Upright 4 Pressure cylinder 41 Cylinder tube 42 Ram 51 Upper mold | type 52 Lower mold | type 6 Slide 61 Through-hole 62 Slide guide 7 Pull-back cylinder 8 Rotating means 81 Main gear 82 Pinion gear 83 Motor

Claims (3)

A pair of molds that sandwich the material;
A pressure cylinder having a cylindrical portion and a sliding portion slidable in the cylindrical portion, and applying compressive stress to the material;
Rotating means for rotating the sliding portion and applying shear stress to the material;
A frame having a crown, a bed, and an upright;
A slide that slides relative to the frame following the sliding of the sliding portion and rotatably supports the sliding portion ;
One of the pair of molds is fixed to the sliding portion ,
The cylindrical portion is fixed to the frame and supports the sliding portion in a rotatable manner.
The rotating means includes
A main gear provided concentrically with the rotation center of the sliding portion, and provided on the sliding portion;
A pinion gear meshing with the main gear;
A high-pressure twist forming machine , comprising: a motor fixed to the slide and rotating the pinion gear . High twist molding machine according to claim 1, further comprising a slide guide for limiting the inclination of the slide. 3. The high-pressure twist molding machine according to claim 1, wherein a plurality of the pinion gears are provided at equiangular intervals around the main gear.

Images