JP2016094974A - Manufacturing method of grooved member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a grooved member for forming a groove at a groove forming surface at a soft processed member in which a workability of the groove can be further improved.SOLUTION: This invention relates to a manufacturing method of a grooved member 1 by forming a groove 3 at a groove forming surface 21 at a soft processed member 2. The groove 3 has one side edge 31, the other side edge 32 and a connecting part 33 between one side edge 31 and the other side edge 32 as seen in a vertical sectional view along a width direction WD. A knife N capable of cutting substantially without forming any cut debris is applied, the knife N is inserted into the groove forming surface 21, the knife N is moved in a longitudinal direction where the groove 3 extends. At first, one side edge 31 is formed and subsequently the other side edge 32 is formed, a separation portion 34 defined by one side edge 31, the other side edge 32 and the connecting part 33 is removed from the processed member 2, resulting in that a grooved member 1 is attained.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for manufacturing a grooved member by forming a groove on a groove forming surface of a workpiece.

  In a sealing device having a seal lip, the seal lip is brought into close contact with, for example, a shaft, and sealing is performed so that oil does not leak as a lubricant from the outer peripheral surface of the shaft. The seal lip can be formed of a fluororesin such as polytetrafluoroethylene (PTFE) in order to ensure heat resistance and pressure resistance, for example. Further, the seal lip can be provided with a groove in order to exhibit the function of capturing the lubricant and pumping it back to the lubricant side (see, for example, Patent Documents 1 and 2 below).

  The fluororesin seal lip (grooved member) having a groove is formed by forming a groove on the upper surface which is a groove forming surface of a cylindrical material (soft workpiece) made of fluororesin, for example. And obtained by slicing the grooved member. As a method for forming a groove on a groove forming surface of a soft workpiece, press forming or cutting is generally used.

JP 2013-142474 A Japanese Patent Application Laid-Open No. 07-042847

  In a method for producing a grooved member for forming a groove on a groove forming surface of a soft workpiece, a method capable of further improving the workability of the groove is desired.

  An object of the present invention is to provide a method capable of further improving the workability of a groove in a method for manufacturing a grooved member for forming a groove on a groove forming surface of a soft workpiece.

  The present invention is a method of manufacturing a grooved member by forming a groove on a groove forming surface of a soft workpiece, and the groove has one side edge and the other in a longitudinal sectional view along the width direction. And a connecting portion between the one side edge and the other side edge, and a knife capable of cutting without substantially generating chips, and using the knife on the groove forming surface. And moving the knife in the longitudinal direction in which the groove extends to first form the one side edge, then form the other side edge, the one side edge, the other side edge and It is a manufacturing method of the member with a groove | channel which removes the separation part divided by the said connection part from the said to-be-processed member, and thereby obtains a member with a groove | channel.

  In addition, in the longitudinal sectional view along the longitudinal direction of the groove, the groove is cut with the knife so that the depth of the groove is gradually increased on the side where the cutting is started and thereafter becomes substantially constant. May be.

  Further, when the one side edge is formed, the knife may be cut to a depth exceeding the connecting portion, and when the other side edge is formed, the knife may be cut to a depth exceeding the connecting portion.

  ADVANTAGE OF THE INVENTION According to this invention, in the method of manufacturing the grooved member which forms a groove | channel in the groove | channel formation surface in a soft to-be-processed member, the method which can improve the workability of a groove | channel can be provided.

It is a perspective view of the grooved member 1 of the 1st form obtained by the manufacturing method of this invention. It is a longitudinal cross-sectional view along the width direction of a groove | channel which shows the groove | channel 3 of a 1st form. (A)-(E) are the longitudinal cross-sectional views along the width direction of a groove | channel which show the formation procedure of the groove | channel 3 of a 1st form one by one. It is a longitudinal cross-sectional view along the longitudinal direction of a groove | channel which shows the formation procedure of the groove | channel 3 of a 1st form one by one. (A), (B) is a longitudinal cross-sectional view along the width direction of a groove | channel which shows the formation procedure of the groove | channel 3A of a 2nd form one by one. (A), (B) is a longitudinal cross-sectional view along the width direction of a groove | channel which shows the formation procedure of the groove | channel 3B of a 3rd form one by one. (A), (B) is a longitudinal cross-sectional view along the width direction of a groove | channel which shows the formation procedure of the groove | channel 3C of a 4th form one by one. (A), (B) is a longitudinal cross-sectional view along the width direction of a groove | channel which shows the formation procedure of the groove | channel 3D of 5th form one by one. It is a perspective view of 1 A of grooved members of the 2nd form obtained by the manufacturing method of this invention. It is a perspective view of grooved member 1B of the 3rd form obtained by the manufacturing method of the present invention. It is a perspective view of 1 C of grooved members of the 4th form obtained by the manufacturing method of this invention. It is a perspective view of grooved member 1D of the 5th form obtained by the manufacturing method of the present invention. It is a perspective view of the grooved member 1E of the 6th form obtained by the manufacturing method of this invention. It is a perspective view of the grooved member 1F of the 7th form obtained by the manufacturing method of this invention.

  Hereinafter, the manufacturing method of the member with a groove | channel of this invention is demonstrated. FIG. 1 is a perspective view of a grooved member 1 of a first form obtained by the manufacturing method of the present invention. FIG. 2 is a longitudinal sectional view showing the groove 3 of the first form along the width direction of the groove. FIGS. 3A to 3E are longitudinal cross-sectional views along the width direction of the grooves, sequentially illustrating the formation procedure of the grooves 3 of the first form. FIG. 4 is a longitudinal sectional view along the longitudinal direction of the grooves, sequentially showing the procedure for forming the grooves 3 of the first embodiment.

As shown in FIGS. 1 to 4, the embodiment of the method for manufacturing a grooved member according to the present invention forms the groove 3 of the first form on the groove forming surface 21 in the soft workpiece 2, thereby forming the grooved member. 1 is a method of manufacturing 1. 2 to 4, WD indicates a width direction, DD indicates a depth direction, and LD indicates a longitudinal direction.
The soft workpiece 2 is a relatively soft member. The relatively soft member is typically made of a material softer than a general synthetic resin material such as a so-called fluororesin. The relatively soft member does not include a member made of a metal material.

Examples of the fluororesin include polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), and ethylene-chlorotrifluoroethylene copolymer (ECTFE). ) Is used.
In addition, examples of the relatively soft member include foamed plastic such as rigid polyurethane foam and carbon fiber reinforced plastic (CFRP).
The workpiece 2 in the embodiment is a cylindrical member made of PTFE.

  As shown in FIG. 1, the groove | channel 3 of a 1st form is provided in the groove | channel formation surface 21 which is a circular upper surface in the cylindrical to-be-processed member 2 so that it may extend spirally. In addition, the groove | channel 3 extended helically may be provided in multiple.

  As shown in FIG. 2, the groove 3 is a connecting portion between one side edge 31, the other side edge 32, and the one side edge 31 and the other side edge 32 in a longitudinal sectional view along the width direction WD. 33. In a longitudinal sectional view along the width direction WD of the groove 3, one side edge 31 has a linear shape that falls toward the inside of the width direction WD, and the other side edge 32 falls toward the inside of the width direction WD. It is straight. The length of one side edge 31 and the length of the other side edge 32 are the same, and the groove 3 of the first form has an isosceles triangle shape.

  Extra cuts 311 and 321 are provided on the extension line of one side edge 31 and on the extension line of the other side edge 32 obliquely downward from the connection portion 33, respectively. The extra cuts 311 and 321 are formed in order to reliably form the connection portion 33 when the one side edge 31 and the other side edge 32 are formed using the knife N as described later (manufacturing errors and design errors are reduced). To absorb).

Next, an embodiment of the manufacturing method of the present invention will be described. In the manufacturing method of the present invention, a knife N that can be cut without substantially generating chips is used. Since the knife N is relatively thin, the knife N can be cut substantially without generating chips. For example, the cutting tool is not included in the knife. The thickness of the knife N is, for example, 0.1 to 2.0 mm. Specifically, the knife N has a tapered shape with a tip side thickness of 0.1 to 0.2 mm and a root side thickness of 1.5 to 2.0 mm.
As shown in FIG. 4, the shape of the knife N viewed from the tip side in the thickness direction is a shape that is narrowed toward the tip and the tip is rounded.

  As shown in FIGS. 2, 3A, 3B, and 4, the knife N is inserted into the groove forming surface 21, and the knife N is moved in the longitudinal direction LD in which the groove 3 extends. 31 and an extra cut 311 are formed. That is, when one side edge 31 is formed, the knife N is cut to a depth exceeding the connection portion 33 (to a depth at which the extra cut 311 is formed) to form the cut K11.

  At this time, as shown in FIG. 4, in the longitudinal sectional view of the groove 3 along the longitudinal direction LD, the depth of the groove 3 is gradually increased on the side where the incision is started and thereafter becomes a substantially constant depth. In this way, cutting is performed with a knife N. In FIG. 4, a gradually deeper region of the groove 3 is denoted by reference numeral 361, and a region having a substantially constant depth is denoted by reference numeral 362. “Slowly deeper” includes a case of deepening in a straight line as shown in FIG. 4 and a case of deepening in a curved line (not shown). The “substantially constant depth” is a depth that can be regarded as a constant depth in terms of machining accuracy, and does not actively change the depth.

  Thereafter, as shown in FIGS. 2 and 3C and 3D, the knife N is inserted into the groove forming surface 21 with an inclination different from that at the time of forming the one side edge 31, and the other side edge 32 and the surplus A cut 321 is formed. When the other side edge 32 is formed, the knife N is cut to a depth exceeding the connecting portion 33 (to a depth at which the extra cut 321 is formed) to form the cut K12.

Thereafter, as shown in FIGS. 2, 3 </ b> D, and 3 </ b> E, the separation portion 34 defined by one side edge 31, the other side edge 32, and the connection portion 33 is removed from the workpiece 2. Thereby, the groove | channel 3 which has the one side edge 31, the other side edge 32, and the connection part 33 in the longitudinal cross-sectional view along the width direction WD is formed. Further, extra cuts 311 and 321 are also formed obliquely downward from the connection portion 33. In this way, the grooved member 1 is obtained.
The knife N that forms one side edge 31 and the knife N that forms the other side edge 32 may use different knives, or the same knife may be used with different inclinations. .

  Next, the variation of the longitudinal cross-sectional view shape along the width direction of a groove | channel is demonstrated. In addition, in the variation of the groove, an extra cut can be provided in the same manner as the groove 3 of the first form. FIGS. 5A and 5B are vertical cross-sectional views along the width direction of the groove, sequentially showing the formation procedure of the groove 3A of the second form. FIGS. 6A and 6B are longitudinal sectional views along the width direction of the groove, sequentially showing the formation procedure of the groove 3B of the third embodiment. FIGS. 7A and 7B are longitudinal sectional views along the width direction of the groove, sequentially showing the formation procedure of the groove 3C of the fourth embodiment. FIGS. 8A and 8B are vertical cross-sectional views along the width direction of the groove, sequentially showing the formation procedure of the groove 3D of the fifth embodiment.

  As shown in FIG. 5, the groove 3A of the second form includes one linear side edge 31A, the other linear side edge 32A, a connecting portion 33A, and a linear additional side edge 35A. Have. From another viewpoint, the groove 3A of the second form has a quadrangular shape having one internal angle of 180 degrees or more. Such a groove 3A can be obtained by forming the outer cuts K21 and K23 and then forming an intermediate cut K22 so as to connect the cuts K21 and K23 as a first method. Alternatively, in the groove 3A, as a second method, after forming only one of the outer cuts K21 or K23, the intermediate cut K22 is formed, and then either the outer cut K21 or K23 is formed. You can get it.

  As shown in FIG. 6, the groove 3B of the third form has one linear side edge 31B, the other arc-shaped side edge 32B, and a connecting portion 33B. Such a groove 3B can be obtained by forming a linear cut K31 and an arc cut K32 in this order or in the reverse order.

  As shown in FIG. 7, the groove 3 </ b> C of the fourth form has one arc-shaped side edge 31 </ b> C, the other arc-shaped side edge 32 </ b> C, and a connection portion 33 </ b> C. Such a groove 3C can be obtained by forming the arc-shaped cut K41 and the arc-shaped cut K42 in this order or in the reverse order.

  As shown in FIG. 8, the groove 3D of the fifth form has one arcuate side edge 31D, the other arcuate side edge 32D, and a connecting portion 33D. The groove 3D of the fifth form has a shape close to a circle or an ellipse compared to the groove 3C of the fourth form.

  The groove is obtained by cutting twice with a knife N to form two side edges. However, the groove is cut three times as in the groove 3A of the second form shown in FIG. It is also possible to form a groove having two side edges. Similarly, a groove having four or more side edges can be formed by cutting four or more times.

  Next, variations in the shape of the groove in the longitudinal direction and the position where the groove is formed will be described. FIG. 9 is a perspective view of a grooved member 1A of the second form obtained by the manufacturing method of the present invention. FIG. 10 is a perspective view of a grooved member 1B of the third form obtained by the manufacturing method of the present invention. FIG. 11 is a perspective view of a fourth embodiment of a grooved member 1C obtained by the manufacturing method of the present invention. FIG. 12 is a perspective view of a grooved member 1D of the fifth embodiment obtained by the manufacturing method of the present invention. FIG. 13: is a perspective view of the grooved member 1E of the 6th form obtained by the manufacturing method of this invention. FIG. 14 is a perspective view of a grooved member 1F according to a seventh embodiment obtained by the manufacturing method of the present invention.

  As shown in FIG. 9, according to the manufacturing method of the present invention, the grooved member 1A of the second form can be manufactured. In the grooved member 1A of the second form, the groove 3H is provided on the groove forming surface 21A that is the upper surface of the cylindrical workpiece 2A so as to extend circumferentially. The circumferential groove 3H may be provided in multiple.

  As shown in FIG. 10, according to the manufacturing method of this invention, the grooved member 1B of the 3rd form can be manufactured. In the grooved member 1B of the third form, the groove 3I extends circumferentially at substantially the same height position on the groove forming surface 21B which is the side surface (circumferential surface) of the cylindrical workpiece 2B. Is provided. The circumferential groove 3I may be provided in multiple.

  As shown in FIG. 11, according to the manufacturing method of the present invention, the grooved member 1C of the fourth form can be manufactured. In the grooved member 1 </ b> C of the fourth form, the groove 3 </ b> J is provided on the groove forming surface 21 </ b> C that is a side surface (circumferential surface) of the cylindrical workpiece 2 </ b> C so as to extend spirally. In addition, the spiral groove 3J may be provided in multiple.

  As shown in FIG. 12, according to the manufacturing method of the present invention, the grooved member 1D of the fifth embodiment can be manufactured. In the grooved member 1D of the fifth embodiment, the workpiece 2D has a shape obtained by hollowing out a small coaxial cylinder from a large cylinder. From another viewpoint, the workpiece 2D has an annular cross-sectional shape having a width. The workpiece 2D has an outer surface (outer peripheral surface) and an inner surface (inner peripheral surface). The groove 3K is provided on a groove forming surface 21D which is an inner surface (inner peripheral surface) of the workpiece 2D so as to extend circumferentially at substantially the same height position. The circumferential grooves 3K may be provided in multiple.

  As shown in FIG. 13, according to the manufacturing method of the present invention, the grooved member 1E of the sixth embodiment can be manufactured. In the grooved member 1E of the sixth mode, the processed member 2E has an outer surface (outer peripheral surface) and an inner side surface (inner peripheral surface) in the same manner as the processed member 2D of the grooved member 1D of the fifth mode. Have. The groove 3L is provided on the groove forming surface 21E that is the inner surface (inner peripheral surface) of the workpiece 2E so as to extend in a spiral shape. The circumferential grooves 3L may be provided in multiple.

  As shown in FIG. 14, according to the manufacturing method of this invention, the grooved member 1F of the 7th form can be manufactured. In the grooved member 1F of the seventh embodiment, the workpiece 2F is a plate-like member. The plurality of grooves 3M are provided linearly and / or in a curved shape on the groove forming surface 21F that is the upper surface of the workpiece 2F. The upper surface of the plate-like workpiece 2F may be flat or curved.

According to the manufacturing method of the present invention, for example, the following effects are exhibited.
In general, when a groove is formed in a hard workpiece, a cutting tool (such as a cutting tool) having the same cross section as the longitudinal sectional view along the width direction of the groove or a narrower cross section is used. The member to be processed is cut while removing the groove to form a groove.
However, when the same cutting process is performed on a soft workpiece, deformation or plastic flow occurs with respect to a constant cross-sectional area. For this reason, swells and burrs are generated in the peripheral part of the cutting location, and it is difficult to form grooves. Even if an attempt is made to remove burrs or the like after the cutting process, the removal process is very difficult due to the low rigidity of the workpiece.
Therefore, since it is generally difficult to cut a soft workpiece, the groove is formed by cutting or cutting the workpiece little by little using a sharp blade. However, it is difficult to form the groove shape by such a method.

  On the other hand, according to the manufacturing method of the present invention, as shown in FIG. 2 and FIG. 3, the groove forming surface of the workpiece 2 using the knife N that can be cut substantially without generating chips. The knife N is inserted into 21 and moved in the longitudinal direction LD in which the groove 3 extends, so that one side edge 31 is formed first, and then the other side edge 32 is formed. The separation portion 34 defined by the side edge 32 and the connecting portion 33 is removed from the workpiece 2. For this reason, deformation and plastic flow hardly occur on the groove forming surface 21 of the workpiece 2, and bulge and burrs hardly occur in the peripheral portion of the groove 3. That is, post-processing (finishing processing) after forming the grooves 3 can be made unnecessary or suppressed. Further, the shape of the groove 3 can be formed with high accuracy. Therefore, the workability of the groove 3 can be improved.

  Further, as shown in FIG. 4, in the longitudinal sectional view of the groove 3 along the longitudinal direction LD, the depth of the groove 3 is gradually increased on the side where the incision is started and thereafter becomes a substantially constant depth. Then, cutting is performed with a knife N. Therefore, the cutting can be started smoothly.

  Further, as shown in FIG. 3, when forming one side edge 31, the knife N is cut to a depth exceeding the connecting portion 33, and when forming the other side edge 32, to a depth exceeding the connecting portion 33, Cut the knife N. For this reason, it is possible to absorb the manufacturing error (such as the depth of cut) and the design error, and to reliably form the connecting portion 33.

As mentioned above, although preferred embodiment of this invention was described, this invention can be implemented with a various form, without being limited to embodiment mentioned above.
For example, the longitudinal sectional view shape along the width direction of the groove 3 in each embodiment, the longitudinal shape of the groove 3, the shape of the workpiece 2, the position of the groove forming surface 21, the shape of the groove forming surface 21 and the like may be combined as appropriate. , Can be replaced.

1, 1A, 1B, 1C, 1D, 1E, 1F Grooved member 2, 2A, 2B, 2C, 2D, 2E, 2F Work piece 3, 3A, 3B, 3C, 3D, 3H, 3I, 3J, 3K, 3L, 3M Groove 21, 21A, 21B, 21C, 21D, 21E, 21F Groove forming surface 31, 31A, 31B, 31C, 31D One side edge 32, 32A, 32B, 32C, 32D The other side edge 33, 33A, 33B, 33C, 33D Connecting portion 34 Separating portion 35A Additional side edge 311 Extra cut 321 Extra cut 361 Gradually deeper region 362 Substantially constant depth DD Width direction K11, K12, K21, K22, K23, K31, K32, K41, K42 Cut LD Longitudinal direction N Knife WD Width direction

Claims (3)

A method of manufacturing a grooved member by forming a groove on a groove forming surface of a soft workpiece,
The groove has one side edge, the other side edge, and a connection portion between the one side edge and the other side edge in a longitudinal sectional view along the width direction,
First, the one side edge is formed by inserting a knife into the groove forming surface and moving the knife in the longitudinal direction in which the groove extends, using a knife capable of cutting substantially without generating chips. Then, the other side edge is formed, and the separation portion defined by the one side edge, the other side edge, and the connection portion is removed from the workpiece, thereby obtaining a grooved member. The manufacturing method of a member with a groove | channel.   In the longitudinal cross-sectional view along the longitudinal direction of the groove, the depth of the groove is gradually increased on the side where the cutting is started, and then the cutting is performed by the knife so as to become a substantially constant depth thereafter. Item 2. A method for producing a grooved member according to Item 1. When forming the one side edge, the knife is cut to a depth exceeding the connecting portion,
The method for manufacturing a grooved member according to claim 1 or 2, wherein when the other side edge is formed, a knife is cut to a depth exceeding the connecting portion.

Images