JP2002059227A - Press die set and direct drive mechanical element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die set for a die and a direct drive mechanical element having a stracture hardly causing skewing. SOLUTION: In the die set for a press die in which a first plane is formed on an outer face of a guide post parallel to its axis, a second plane is formed on an inner face of the guide bush parallel to its axis, when the guide post is pierced to a hollow part of the guide bush, the first plane and the second plane are faced to each other, and a plane roller bearing is interposed between the first plane and the second plane, the plane roller bearing interposing plural rollers between the plane roller holders consisting of members which include a linear section having respective rollers of the plane roller bearing in contact with the first plane/second plane, are arranged with opening windows 112, 113, have a bisected/same shape, and are made of polyvinyl chloride or resin, and freely rotatably holding them, is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die set used for punching, bending, drawing, coining, forging, rubber molding, molding, die casting, powder molding, and the like. In particular, it relates to sliding parts such as guide posts, retainers, and guide bushes. The invention also relates to a linear motion machine element, usually referred to as a linear motion system. And the linear motion machine element of the present invention is a semiconductor manufacturing device, a precision scientific instrument, a measuring instrument,
It can be applied to optical devices, copiers, printers, electric devices, and press machines in general, and is particularly suitable for application to injection molding machines. An injection molding machine is a machine in which one of two halves is attached to a movable platen and a fixed platen respectively, and the movable platen is moved along a spline axis. This is a machine that injects resin containing fiber, resin containing carbon, etc. into the cavity of the mold under pressure and solidifies, and then separates the mold to take out the solidified molded product.

[0002]

2. Description of the Related Art In a die set for a press die, an upper die and a lower die relatively vertically slide through a guide post, a retainer, and a guide bush to perform a punching process or the like.

In a die set for a press die disclosed in Japanese Patent Application Laid-Open No. 6-328165, a running plane formed on a guide post and a running plane formed on an inner surface of a guide bush are opposed to each other, and a flat roller and a bearing are interposed therebetween. To rotate and run. The flat roller of the flat roller bearing used here is a needle roller or a rod roller. Needle rollers and rod rollers each have a length / diameter ratio of 3 or more and 10 or less, but have a diameter of 5 or less.
Those having a diameter of 5 mm or less are called "needle rollers", and those having a diameter of more than 5 mm are called "bar rollers".

[0004]

However, in a conventional die set for a press die or a linear moving machine element, a flat roller is rotated along a running plane formed on a side surface of a guide post or a spline nut to form a straight line. When exercising, the flat roller tends to tilt.

[0005] The phenomenon in which the roller tilts during exercise is generally called "skewing" or "skew".
When skew occurs, the roller is difficult to rotate smoothly, the roller slides on the running surface, and the friction force increases rapidly. As a result, during the repetitive linear motion, the retainer gradually comes off at the top dead center or the bottom dead center, and finally cannot perform the repetitive linear motion. Therefore, the linear movement must be temporarily stopped, the retainer must be removed from the guide post or the spline nut, the retainer must be disassembled, and the retainer must be reassembled.

[0006] When skew occurs, positional accuracy deteriorates, which is a problem. It is not a pure linear motion, but a rotary motion and a torsional motion are added.

Further, if skew occurs, there is a problem that the running surface is scratched or worn, or the rollers are worn, shortening the service life.

Accordingly, an object of the present invention is to provide a die set for a press die and a linear motion machine element having a structure in which skew is unlikely to occur.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to provide a die set for a press die according to the first aspect of the present invention, that is, a guide post having a substantially round bar shape is passed through a hollow portion of a substantially cylindrical guide bush via a retainer. A die set for a press die in which the guide bush moves linearly along the guide post, wherein a first plane parallel to its axis and perpendicular to its radius is formed on the outer surface of the guide post; A second plane parallel to the axis and perpendicular to the radius is formed on the inner surface of the guide bush, and when the guide post is passed through the hollow portion of the guide bush, the first plane and the second plane are In a die set for a press die which is opposed to each other and has a flat roller bearing interposed between a first plane and a second plane, each row of the first and second planes and the flat roller bearing is provided. A length / diameter ratio of less than 3 between two split, flat roller bearing holders made of identically shaped vinyl chloride or resin members with aperture windows containing straight sections that contact This is achieved by a die set for a press die, which uses a flat roller bearing that holds a plurality of rollers so as to be rotatable and that adjacent rollers are parallel to each other.

The object of the present invention is to provide a die set for a press die according to claim 2, that is, a guide post having a substantially round rod shape penetrating a hollow portion of a substantially cylindrical guide bush through a retainer. In a die set for a press die that linearly moves along a guide post, two planes are formed on the outer surface of the guide post in parallel with its axis.
A first right-angled groove forming an angle of 90 ° and a first plane parallel to its axis and orthogonal to its radius are formed. On the inner surface of the guide bush, two planes are formed at 90 ° parallel to its axis. When a guide post is made to pass through the hollow of the guide bush by forming a second right-angle groove having an angle of? And a second plane parallel to its axis and perpendicular to its radius, the first right-angle groove is formed. And the second
And the first plane and the second plane face each other, a cross roller bearing is interposed between the first right groove and the second right groove,
This is also achieved by a die set for a press die, characterized in that a flat roller bearing comprising a number of rollers having a length / diameter ratio of less than 3 is interposed between the first plane and the second plane. You.

Further, the above object is achieved by making a substantially linear rod-shaped spline shaft penetrate a hollow part of a linear motion mechanical element, that is, a substantially cylindrical spline nut, and the spline nut extends along the spline shaft. A linear motion machine element that moves linearly and forms a first plane parallel to its axis and orthogonal to its radius on an outer surface of a spline shaft, and is formed on an inner surface of a spline nut parallel to its axis and its radius. Is formed, and when the spline shaft is passed through the hollow portion of the spline nut, the first plane and the second plane face each other, and the first plane and the second plane are formed. In the linear motion machine element having a flat roller bearing interposed between the flat surfaces of the flat roller bearing, an aperture window including a linear portion where the first and second flat surfaces directly contact each roller of the flat roller bearing is formed. Establishment Adjacent rollers hold two or more rollers with a length / diameter ratio of less than 3 between flat roller bearing holders made of vinyl chloride or resin members of the same shape. This is also achieved by a linear machine element characterized by using flat roller bearings that are assembled to be parallel.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIG. 1 is a front view of a retainer according to a first embodiment of the present invention, and FIG. 2 is a schematic plan view of the retainer according to the first embodiment of the present invention.

The retainer 1 has a cylindrical shell shape, and a flat roller bearing 13 in which a large number of rollers 12 are rotatably held in a flat roller bearing holder 11.
And a coupling member 14 having coupling grooves on both side ends and having a curved surface. The side end of the flat roller bearing 13 is fitted and connected to the connecting groove at the side end of the connecting member 14.

FIG. 3 is an explanatory view showing the flat roller bearing holder according to the first embodiment of the present invention. The flat roller bearing holder 11 is constructed by combining two parts of a vinyl chloride part 110 having the same shape and divided into two parts. The semi-cylindrical concave portions 111 are arranged at predetermined intervals,
At the bottom of the recess 111, rectangular aperture windows 112, 11 are provided.
3 are formed two by two. When two cylindrical rollers (not shown) are arranged and accommodated in the recess 111 such that the rotation axes are aligned in a straight line, the rollers are rotatably held, and the two rollers come into contact with each other. Designed not to. A part of each roller is exposed to the outside through the aperture windows 112 and 113, and when the retainer is interposed between the guide post and the guide bush, each roller becomes a travel plane of the guide post and a travel plane of the guide bush. Runs in contact with.

FIG. 4 is a perspective view of the roller of the first embodiment. The roller 12 has a cylindrical shape, and the boundary between the side surface 121 and the bottom surfaces 123 and 124 is chamfered. This is to prevent the flat roller bearing holder and the running surface from being damaged. Instead of chamfering, an R portion may be formed at the boundary. The length (L) / diameter (D) ratio is 2.5.

The roller is designed to rotate and run toward the center axis of the guide post. That is, the axis of rotation of the roller should be kept perpendicular to the long axis of the guide post. Similarly, the rollers are designed to run rotationally toward the central axis of the guide bush. However, for some reason,
When "skewing" occurs and the roller deviates from the normal running direction, and the rotation axis of the roller is inclined from the direction perpendicular to the long axis of the guide post or guide bush,
If the ratio of the length (L) / diameter (D) of the roller is less than 3, instantaneous return to the normal direction and normal rotation running due to imbalance of the frictional force acting on the roller. Applicants have found by experiment. Therefore, according to the die set for a press die according to the present invention, this is equivalent to substantially no "skewing" occurring.

In the present embodiment, the rollers are set sideways.
The rollers are arranged one by one, and a large number of the rollers are arranged in parallel at predetermined intervals in the running direction, and two rows of rollers are arranged in a grid.

Second Embodiment Another embodiment (second embodiment) can be modified so that two rows of rollers are arranged in a staggered manner.

Third Embodiment In still another embodiment (third embodiment), three rows of rollers are arranged in a staggered manner. The ratio of length (L) / diameter (D) of each roller is 2.9.

Fourth Embodiment In another embodiment (fourth embodiment), three rows of roller groups are arranged in a grid. Among the three rows, the rollers in the leftmost row and the rightmost row have a length (L) / diameter (D) ratio of 2.0, and the rollers in the middle row have a length (L) / diameter (D) ratio. ) Was 3.5.

In any of the above embodiments, a low-friction spacer may be interposed between the rollers so that the rollers arranged side by side can freely rotate with respect to each other, or the roller may be inserted into the recess of the flat roller bearing holder. May be provided so as not to contact with each other.

As the material of the roller, bearing steel,
Tool steel, high-speed steel, cemented carbide, and ceramics can be used.

In any of the above embodiments, two flat and roller bearing parts are combined to form a flat roller bearing holder, and the roller is housed and held in the semi-cylindrical recess. In comparison with the conventional caulking method, the rollers do not come off and fall off at all, and the space for caulking work is unnecessary, so the interval between the rollers arranged in parallel, compared to the conventional caulking method, It can be much shorter. As a result, it is possible to increase the arrangement density of the rollers and to withstand a large load. In particular, it is suitable for performing high-speed reciprocating motion with high accuracy.

[0025]

In the die set for a press die according to the present invention, since the ratio of the length / diameter of each roller of the flat roller bearing is set to less than 3, even if the position of the roller is inclined, it is instantaneous. In addition, the vehicle returns to a normal position and rotates, and as a result, substantially no "skewing" occurs, and there is no adverse effect due to "skewing". That is, the frictional resistance does not suddenly increase during the repetitive linear motion, and at the top dead center and the bottom dead center, the retainer does not gradually come off, rotation and torsion hardly occur and pure linear motion, The effect of improving the position accuracy is obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a retainer according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view of the retainer according to the first embodiment of the present invention.

FIG. 3 is an explanatory view showing a flat roller bearing holder according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a roller according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retainer 11 Flat roller bearing holder 12 Roller 13 Flat roller bearing 14 Coupling member 110 Parts made of vinyl chloride 111 Depression 112 Opening window 113 Opening window 121 Side surface 123 Bottom surface 124 Bottom surface

Claims (4)

[Claims] 1. A substantially round bar-shaped guide post is passed through a hollow portion of a substantially cylindrical guide bush via a retainer,
A die set for a press die in which a guide bush moves linearly along a guide post, wherein a first plane parallel to its axis and orthogonal to its radius is formed on an outer surface of the guide post, and an inner surface of the guide bush is formed. A second plane is formed parallel to the axis and perpendicular to the radius so that the first and second planes face each other when the guide post is passed through the hollow portion of the guide bush. In a die set for a press die in which a flat roller bearing is interposed between a first plane and a second plane, the first plane, the second plane, and each roller of the flat roller bearing are provided. A plurality of rollers having a length / diameter ratio of less than 3 between a flat roller bearing holder made of a two-part, same-shaped vinyl chloride or resin member having an aperture window including a contacting linear portion. Scissors rotatably holds the die set for press die rollers, characterized by using a flat roller bearings assembled in parallel adjacent. 2. A substantially round bar-shaped guide post is passed through a hollow portion of a substantially cylindrical guide bush via a retainer.
In a die set for a press die in which a guide bush moves linearly along a guide post, a first right-angled groove in which two planes form an angle of 90 ° is formed on an outer surface of the guide post, parallel to the axis, and the axis thereof. And a second plane perpendicular to the radius of the guide bush, on the inner surface of the guide bush, parallel to its axis, a second right-angle groove whose two planes form an angle of 90 °, When a second plane that is parallel and perpendicular to the radius is formed and the guide post penetrates through the hollow of the guide bush, the first right-angle groove and the second right-angle groove face each other, and And a second plane are opposed to each other, a cross roller bearing is interposed between the first right-angle groove and the second right-angle groove, and a length is provided between the first plane and the second plane. A flat roller consisting of a number of rollers with a height / diameter ratio of less than 3・ Die set for press dies, with bearings interposed. 3. A linear motion machine element in which a substantially round bar-shaped spline shaft is passed through a hollow portion of a substantially cylindrical spline nut, and the spline nut linearly moves along the spline shaft. A first plane parallel to the axis and orthogonal to the radius is formed, and a second plane parallel to the axis and orthogonal to the radius is formed on the inner surface of the spline nut to form a hollow portion of the spline nut. A linear machine element having a first plane and a second plane facing each other when a spline shaft is passed through, and a flat roller bearing is interposed between the first plane and the second plane. Wherein the first and second planes are provided with an aperture window including a linear portion where the respective rollers of the flat roller bearing directly contact each other, and are made of the same polyvinyl chloride or resin member. Flat b A flat roller bearing is used to hold a plurality of rollers having a length / diameter ratio of less than 3 between roller bearing holders so that they can rotate freely and to assemble adjacent rollers in parallel. And linear motion machine element. 4. A linear motion machine element in which a substantially round bar-shaped spline shaft penetrates a hollow portion of a substantially cylindrical spline nut, and the spline nut linearly moves along the spline shaft. Parallel to the first plane, the two planes form a first right-angle groove forming an angle of 90 °, and a first plane parallel to its axis and orthogonal to its radius. Parallel, a second right-angle groove where the two planes make an angle of 90 °, and parallel to its axis,
When a second plane perpendicular to the radius is formed and the spline shaft is passed through the hollow part of the spline nut, the first right-angle groove and the second right-angle groove face each other, and
And a second plane are opposed to each other, a cross roller bearing is interposed between the first right-angle groove and the second right-angle groove, and a length is provided between the first plane and the second plane. Sa /
A linear motion machine element comprising a plurality of flat roller bearings having a diameter ratio of less than three.