JP2002346801A - Manufacturing method of plastic-ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producion effective manufacturing method of a large variety of plastic-rings, in the manufacture method for manufacturing rings from a cylinder-like base material by NC machine tools. SOLUTION: In the manufacture method of the plastic-ring where a cylinder body made of resin (1) an end section of which carries out flat processing is held and axially rotated, and after having shaped an outer diameter and an inner diameter by cutting processing of an outer perimeter edge (10a) and an inner perimeter edge (10b) of an end face (10), cut down to an axial perpendicular direction in an axial distance, more than 1 or 2 circular ringlike slots (14) set up at desired width and depth of more than 1 or 2 radiuses are cut between the outer diameter and the inner diameter of the end section, and are cut out more than 2 rings of different diameters (2, 3). Also, in the above-cutting-out, it may be made to carry out at a respectively different axial distance (21, 31) from the end section, or edge processing to either inner edge (32) or outer edge (22) of at least each rings may be made to carry out before cutting out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin ring used for, for example, a seal ring of a pressure-resistant sealing part or a backup ring for packing.
The present invention relates to a method for manufacturing a resin ring for cutting a resin cylindrical body to cut out a ring having a desired shape.

[0002]

BACKGROUND OF THE INVENTION Conventionally, seal rings and packings have been used in hydraulic control parts such as torque converters, automatic transmissions, hydraulic motors, and the like for the purpose of sealing and holding hydraulic oil. In the packing, a backup ring is appropriately used depending on the operating pressure.

[0003] The material of the seal ring and the backup ring (hereinafter simply referred to as "ring") is made of a tetrafluoroethylene resin or a polyamide resin in consideration of workability, wear resistance and low friction characteristics. Many are used. As the manufacturing method, there are a method of forming with an injection molding machine and a method of cutting out from a cylindrical body (hereinafter, referred to as “base material”) of a resin material with an NC machine tool. Some of the rings are separated (cut) in the circumferential direction for convenience of mounting.

[0004]

2. Description of the Related Art The above-mentioned manufacturing method using an injection molding machine is suitable for mass-producing the same product in good yield because a dedicated mold is used. In order to produce this ring, it is necessary to replace the mold, which requires the production cost of the mold and the replacement work, which is not suitable for small-quantity production of multi-dimensional products.

[0005] On the other hand, a method of cutting out a base material by an NC machine tool can cope with small-scale production of a multi-dimensional product. However, the dimensions (wall thickness, inner diameter, outer diameter, etc.) of the base material are standard dimensions, and some base material manufacturers have their own dimensions. However, a long machining time is required for rough cutting and finishing, and the yield of the material is poor. In other words, since only one kind of ring can be cut out and manufactured from one base material, it is necessary to keep a large number of base materials in stock in consideration of supporting various types of standard dimensions,
Each time a standard ring was manufactured, it was necessary to attach a corresponding base material to the NC machine tool and change the setup, resulting in poor production efficiency. This has been a major obstacle to reducing the manufacturing cost of the ring.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and in a method of manufacturing a ring from a cylindrical base material using an NC machine tool, it is possible to simultaneously improve the yield and efficiently use many types of rings. An object of the present invention is to provide a method for manufacturing a resin ring that can be cut out and manufactured.

[0007]

In order to achieve the above object, the resin ring of the present invention is manufactured by the following method. That is, a resin cylindrical body (1) having a predetermined thickness whose end face is flattened is held and rotated around an axis, and an outer peripheral edge (10a) and an inner peripheral edge (10b) of the end face (10) are cut and processed respectively. In the method for manufacturing a resin ring, the outer and inner diameters of the end face (10) are formed by cutting the outer and inner diameters of the end face (10) in a direction perpendicular to the axis at a desired axial distance. ), One or two or more annular grooves (14) having one or more diameters and set to a desired width and depth are subjected to a cutting process,
The above-described rings (2, 3) having different diameters are cut out from the same end surface (10).

In cutting out two or more rings of different diameters (2, 3) formed on the same end surface (10), the axial distances from the end surface (10) are different from each other.
31).

Further, at least two inner diameter rings (2, 3) formed on the same end surface (10), at least the inner edge (32) or the outer edge (22) of each ring (2, 3) before cutting. May be subjected to edge processing.

The reference numerals in parentheses described in the claims and in the section of "Means for Solving the Problems" are attached with reference numerals in the drawings for reference to facilitate understanding of the structure of the invention. Of course, it is not limited to the form on the drawing.

[0011]

Next, a specific embodiment of the method for manufacturing a resin ring according to the present invention will be described in detail with reference to the drawings. FIGS. 1 to 4 and FIGS. 6 and 7 are perspective views showing processing states of respective steps, and FIG. 5 is a longitudinal sectional view of FIG.

The resin cylindrical body (hereinafter referred to as "base material 1") used in the present embodiment is appropriately selected depending on the specification of the ring to be manufactured. For example, a cylindrical body made of polyamide resin (Ube Industries, Ltd.) The main dimension of the base material 1 is 145 mm in outer diameter and 105 mm in inner diameter. Also, NC (Numerical control: NC) used in this embodiment
Machine tools are commonly used and have a lathe processing function and a tool changing function, and appropriately change a desired tool ("bite / bite") according to the specification of a cutting portion to perform a processing process. Is what you do. Using such an apparatus, a large ring 2 (outer diameter 140 mm, inner diameter 127 mm, plate thickness 3 mm) and a small ring 3 (outer diameter 120 m
m, an inner diameter of 111 mm, and a plate thickness of 3 mm).

As a procedure, first, as shown in FIG.
Initial settings such as fixing the base material 1 to the chuck C which rotates the axis of the NC machine tool M are performed.

Next, the NC machine tool M is started, and a dedicated machining program input in advance is called,
The cutting of the base material 1 is started according to the following process order.

First, in a first step, the end face 10 on one end side of the base material 1 is cut and processed into a flat face having a face perpendicular to the rotating shaft 13.

In the second step, as shown in FIG.
The outer peripheral surface 11 of the large ring 2 is cut along the axis 13 from the outer peripheral edge 10a to the outer diameter of the large ring 2 by a dimension exceeding the plate thickness 21 of the large ring 2. To finish.

In the third step, as shown in FIG.
0, the inner peripheral surface 12 is cut along the axis 13 along the axis 13 to the inner diameter of the small ring 3 by a size exceeding the thickness 31 of the small ring 3 and the inner edge 32 has a predetermined dimension. (In this embodiment, R0.5).

Next, in a fourth step, the inner diameter side 20 of the large ring 2 and the outer diameter side 30 of the small ring 3 are simultaneously cut. As shown in FIG. 4 and FIG.
An annular groove 14 is formed concentrically with the above, and excavation processing is performed with the dimensions of the plate thicknesses 21 and 31 of the large ring 2 and the small ring 3 as the machining depth. In the present embodiment, the tool is not replaced when the groove 14 is formed, and at the same time, the large ring 2 is not replaced.
The inside diameter side 20 of the small ring 3 is a curved surface, and the outside diameter side 30 of the small ring 3 is a double-edge type dedicated tool capable of cutting to a sharp edge.

After completing the above steps, in the fifth step,
As shown in FIGS. 6 and 7, the large ring 2 and the small ring 3 are cut in the direction perpendicular to the axis with the axial distance from the outer peripheral surface 11 side of the base material 1 to the end face 10 corresponding to each plate thickness.

By repeating the above steps, the same number of different rings of the large ring 2 and the small ring 3 are cut out by the same number each time the entire stroke is completed.

Finally, if necessary, another machine tool or the like is used to cut the end surface on the cut-out surface side, perform edge processing on the inner and outer diameter edges, and perform bias cut for ring setting.

The dimensions of the base material 1, the large ring 2, and the small ring 3 are not limited to those in the present embodiment, but can be freely set according to the fixing ability of the chuck C of the NC machine tool M. In the NC machine tool M of this embodiment, the maximum outer diameter is 380
The small and large rings are cut out by appropriately combining from the range of the base material dimensions of 50 mm and the minimum inner diameter of 50 mm. That is, this combination can be freely set as long as certain conditions such as the stock removal of the base material 1 and the securing of the width of the groove 14 are satisfied.

[0023]

[Possibility of Other Embodiments] In the above embodiment, after the outer peripheral surface 11 and the inner peripheral surface 12 of the base material 1 are cut in the first to third steps, the large ring 2 and the small ring 3 in the fourth step are cut. Groove 1 between
4 is excavated, but the present invention is not limited to this order. After the excavation of the groove 14, the outer peripheral surface 11 and the inner peripheral surface 12 of the base material 1 are cut. You may do so. In addition, the processing order shown in the second step and the third step is appropriate.

The plate thickness of the large ring 2 and the small ring 3 cut out from the base material 1 is the same in the above embodiment, but is not limited to this condition. That is, each ring 2,
The thickness of each plate may be changed depending on the required size of 3, and in that case, the cutting process is performed by changing the axial distances 21 and 31 (plate thickness) of each ring from the end face 10 side of the base material 1. You can do it.

Further, two types of rings cut out from the end face 10 of the base material 1 are preferable from the viewpoint of yield rate and demand forecast of various rings, but are not limited thereto. It is also possible to set more than five types (in some cases, five or six types), and the base material 1 may be changed from a cylindrical body to a round bar material in order to increase the area of the end face 10.

[0026]

As described above, the present invention cuts out and forms two or more types of rings having different diameters simultaneously from the end face of the base material, so that it is possible to cope with small-quantity production of other types and to reduce the production cost by improving the yield. Can be planned.

Further, by effectively using the base material, the base material type for the ring type can be limited to the minimum necessary.
Its storage space can be reduced, and its contribution to the industry is significant.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a processing state in a process of this embodiment.

FIG. 2 is a perspective view showing a processing state in a process of the present embodiment.

FIG. 3 is a perspective view showing a processing state in a process of the present embodiment.

FIG. 4 is a perspective view showing a processing state in a process of the present embodiment.

FIG. 5 is a longitudinal sectional view of FIG.

FIG. 6 is a perspective view showing a processing state in a process of the present embodiment.

FIG. 7 is a perspective view showing a processing state in a process of the present embodiment.

[Description of Signs] 1 Base material (resin cylindrical body) 10 End surface 10a Outer edge 10b Inner edge 11 Outer surface 12 Inner surface 13 Shaft 14 Groove 2 Large ring 20 Inner diameter side 21 Plate thickness (axial distance) 22 Outer edge 3 Small ring 30 Outer diameter side 31 Plate thickness (axial distance) 32 Inner edge C Chuck (of NC machine tool) M NC machine tool

Claims (3)

[Claims] An end surface (10a) and an inner periphery (10a) of the end surface (10) are held by rotating a shaft while holding a resin cylinder (1) having a predetermined thickness and having a flattened end surface.
b) forming a desired outer diameter and inner diameter by cutting each, and then cutting the ring in a direction perpendicular to the axis at a desired axial distance to produce a ring. The peripheral edge (10a) and the inner peripheral edge (10
b), one or more annular grooves (14) having one or more diameters and set to a desired width and depth are subjected to a cutting treatment to thereby form two or more different-diameter rings (2). 3. A method for manufacturing a resin ring, wherein 3) is cut out from the same end face (10). 2. In cutting out two or more rings of different diameters (2, 3) formed on the same end surface (10), the axial distances from the end surface (10) are cut out with different axial distances (21, 31). The method for manufacturing a resin ring according to claim 1, wherein: 3. At least two inner diameter rings (2, 3) formed on the same end face (10), at least an inner edge (32) or an outer edge (22) of each ring (2, 3) before cutting. 3. An edge processing is performed on any one of the above (1) and (2).
A method for producing the resin ring according to the above.