JP3093979B2 - Vane and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a vane used for various positive displacement actuators and a method of manufacturing the same.

[0002]

2. Description of the Related Art First, the operation of an actuator using a vane will be described with reference to FIG. 8, which is an example of a sectional view of a hydraulic vane pump. In FIG. 8, the rotor 11 is inserted into a closed space formed by a pair of side blocks 18 in a direction perpendicular to the plane of the paper and the cam ring 13 sandwiched between the side blocks 18.
Are rotatably supported. The vane 1 has a substantially rectangular parallelepiped outer shape, and the both sides in the thickness direction are the rotor 1.
One radial groove 12 and both end faces are side blocks 18.
, Each of which is slidably guided at the end face of the rotor 11 and rotates together with the rotor 11 in the direction of arrow 20. Here, each vane 1 is provided with a centrifugal force due to rotation, or a hydraulic force further pressurized by a spring force or as described later.
The top surface, which is one surface perpendicular to each guide surface and has a middle-to-high shape in the thickness direction, is formed by the force for pushing the vane 1 generated by entering through the gap with the radial groove 12 and the cam surface 14 of the cam ring 13. It rotates while relatively sliding in the thickness direction while constantly pressing against it. The pump chamber 15 divided by the rotor 11, each vane 1, the cam surface 14 of the cam ring 13 and the side block 18 has a maximum volume at the upper left and lower right sides in the figure and a minimum volume at the lower left and upper right sides in the drawing. By rotation, hydraulic oil is sucked from suction ports 16, 16 provided in the side block 18, and discharged through the pump chamber 15 to discharge ports 17, provided in the side block 18.
It is ejected from 17.

The top surface of the vane 1 which slides in contact with the cam ring 13 has a middle and high profile in the direction of relative movement, that is, in the thickness direction, so as to obtain good friction and a sealing state in accordance with the relative angle change with the cam surface. And maintain the sealing action while sliding. For this reason, the surface needs to be finished with high accuracy in both shape accuracy and surface roughness. The cam ring 13 is usually sandwiched between both sides (front and back sides of the paper) by side blocks.

[0004] This pump can be used as it is as a hydraulic motor. In addition to the above-described types, there are various types of actuators using a vane, such as a type in which the vane performs a sealing action while the top surface slides on the outer peripheral surface of the eccentric rotor. Some of them are handled, and the vane of the present invention and the method for producing the same are applied to any of these. In the present invention, a cam ring 1 in which a vane performs a sealing action while sliding on a top surface thereof.
Members such as 3 are called mating members, and these mating members have at least one end (usually both ends) adjacent to the side block.

The top surface of the vane has a shape accuracy as described above,
Since high accuracy is required for both surface roughness and roughness,
In general, creep feed grinding is performed while a grinding wheel 9 having a regular-shaped groove formed by a dressing tool is relatively moved in a direction perpendicular to the plane of FIG. Grinding with high straightness and fine surface roughness. However, this processing method is inefficient and easily raises processing costs.

For this reason, there has been proposed a method of manufacturing a vane by omitting the creep feed grinding. That is, Japanese Patent Application Laid-Open No. 58-206896 discloses that, as a raw material, a flat wire material having at least one edge surface having an arc-shaped convex surface is subjected to a normalizing treatment, and then cut into a predetermined length to obtain a vane material. After hardening, each surface except the arc-shaped convex surface is finished to a predetermined size by grinding to form a vane,
With this arc-shaped convex surface as the top surface, this surface is incorporated in the pump so as to face the cam surface of the cam ring, and the smoothing operation is performed.The decarburized layer generated during the normalizing process during the smoothing operation is subjected to initial wear. By doing so, it is proposed that the shape be adapted to the cam ring shape. However, the above method is not applied because a large amount of abrasion powder is generated, and this is likely to cause a trouble.

Japanese Unexamined Patent Publication (Kokai) No. 2-308993 discloses a flat wire material 30 having a predetermined cross-sectional shape having both edge surfaces serving as a top surface 30c and a bottom surface 30d in FIG. 11 by plastic working (drawing or extrusion). As shown in FIG. 3, a pair of rolls 21 and 22 form a chamfered portion 30e, 30f,
a, rear surface 30b, curved surfaces 30h, 30i
After rolling under the control of 3, 24 (both edges 30c and 30d are not restrained), the obtained flat bar is cut to a predetermined length, preferably by a band saw or by press cutting (shearing). A method of manufacturing a vane for grinding a cut surface is proposed. However, in this method, the top surface 30c of the strip-shaped material obtained by drawing or extruding is used.
However, even if it is finished with high middle-high shape accuracy and high straightness, the straightness and the shape of the middle-high top surface are easily disturbed by rolling from the thickness direction, and as a result, the sealing performance of the top surface The present inventor's test has revealed that the band saw cutting recommended by this proposal cannot sufficiently reduce the manufacturing cost.

In general, a flat wire material is used as a material for producing a vane material, including the above two proposals, and this flat wire material can be cut at any stage by sawing a band saw or the like, cutting a grindstone, shearing with a press machine, or the like. It is cut to a predetermined length. In each of the cutting methods, the accuracy of the cut surface (length accuracy, surface roughness, scratches, squareness, straightness, etc.) is insufficient, and the cross-sectional shape is disturbed in shearing.
It is necessary to finish grind the cut surface with an appropriate grinding allowance. Therefore, the cutting method and the surface grinding allowance are also important factors that determine the vane manufacturing cost.

In order to improve the overall efficiency of the actuator, it is important to reduce the friction between the vane and the mating member and the leakage. For this reason, the mating member needs to have an accurate and sufficiently fine surface roughness like the top surface of the vane, and when the mating member particularly uses an inner diameter such as a cylinder or a cam ring, the inner diameter machining method is used. Usually, an inner diameter grinder is used. The processing method using this inner diameter grinding machine is based on a grindstone supported by a small diameter and cantilever shaft, so it has low rigidity, low processing efficiency, and spark-out (grinding spark It is likely that the continuation of the work up to the point where it does not come out) becomes insufficient. For this reason, processing sagging (a taper shape opening to the opening side) occurs, for example, within a range of about 0.5 mm from the end face.
When the top surface of the vane slides on the outer peripheral surface of the mating member, the mating member also has a different degree of sagging, but still has sagging.

On the other hand, since the vane material is usually subjected to a barrel treatment as a finishing treatment, the top surface of the vane material is also sagged at about 0.1 mm or less from its outermost end.
Therefore, when the vane and the mating member are assembled, dripping of both members is added to cause an increase in leakage.

[0011]

SUMMARY OF THE INVENTION The present invention reduces a leak at a sliding portion with a mating member, or reduces a manufacturing cost of a vane or a vane capable of allowing machining droop of a mating member to be larger. It is an object of the present invention to provide a vane that has been manufactured, and to provide a vane manufacturing method capable of reducing the processing cost of the vane itself.

[0012]

SUMMARY OF THE INVENTION The inventor of the present invention has proposed that, if dripping of a mating member is unavoidable, the shape of the top surface of the vane should be bulged at the end so as to compensate for the dripping. Focusing on, the specific method of swelling was examined. As a result, in the production of the vane, the top surface is cut by cutting from a long flat wire material, and then pressing in one or both directions of D1 (direction between end faces) and D2 (thickness direction) in FIG. 1a can be bulged toward the mating member (upward in the figure) in the vicinity of the extreme end. However, the most desirable bulging method is to use a flat wire material (flat bar) as a vane material in the thickness direction in the shear direction. When the individual pieces are cut by shearing as follows, the shearing cost is the lowest, and the shearing portion receives the pressure in the direction D2 in FIG. 6 by the shearing tool and swells in the width direction. ,
By grinding the cut surface with a small grinding allowance, the swelling shape can be left without completely removing it, low-cost cutting and swelling processing can be obtained at once, and the swelling amount in this case is By changing the hardness of the workpiece at the time of cutting (hardness adjustment by temporary quenching and tempering if necessary) and the shape and clearance of the cutting blade, it can be adjusted to 6 to 10 μm, 4 to 6 μm or 4 μm or less. I understood that.

An experiment on a pump incorporating a vane whose top surface bulges toward the mating member near the outermost end confirms an improvement in overall efficiency due to a reduction in leakage due to the presence of the bulge of the vane. However, by swelling an appropriate amount, the leak should be able to be reduced without causing any other trouble. In addition, as a result of the test, no inconvenience due to at least the top surface being excessively bulged was found even when vanes bulging beyond the sagging shape of the mating member were combined. For this reason, as a cutting method, a shearing method, which is several times more efficient and inexpensive than a wheel cutting or saw cutting, is used, and a large amount of the cross-sectional shape change (top surface bulges) due to this cutting is used. The present inventor has found that the total machining cost of the shearing and the end face grinding can be sufficiently reduced as compared with the conventional machining method without removing by the grinding of the grinding allowance.

[0014] That is, the first aspect of the present application, in the thickness direction
In this way, the sealing action is performed while sliding the middle
In the vane to be held , the top surface is bulged toward the counterpart member near the outermost end. Further describing the vane of the present invention in detail, the vane has a substantially rectangular parallelepiped outer shape, and is slidably mounted on both sides and both end faces in the thickness direction thereof as guide faces, and is perpendicular to each of these guide faces. The top surface, which is one surface, has a middle height in the thickness direction, and in the vane that slides on the top surface with a mating member to maintain a sealing action, the top surface is at least one of the end surfaces near the endmost end thereof. Are bulging to the partner member side.

Further, the inventor of the present invention has found that, for example, even in the case of a strip material (flat bar) as it is subjected to plastic working, it is possible to sufficiently increase the surface roughness and straightness of the convex surface of one of the edge surfaces serving as the top surface of the vane. Thereby, the surface roughness of the top surface of the vane can be made equal to or higher than the surface roughness (for example, about 0.4 Rz) by the conventional creep polishing (for example, about 0.3 Rz), and both ends of the top surface can be formed. The straightness of the central portion excluding the bulging portion is 5 μm or less, preferably 3 μm or less, and more preferably 1 μm.
m or less, and it has been found that the vane having such surface roughness and straightness is sufficiently applicable to applications such as power steering of automobiles.

Therefore, it is possible to leave the surface as it is plastically worked as the top surface and use it, and if this surface is used, creep polishing can be omitted, and if the above-described shearing method is used, the vane can be used. It has been found that it is very advantageous in terms of manufacturing cost, and that the swelling amount in the power steering application is desirably 10 μm or less.
Accordingly, the vane manufacturing method invention of the present application is to shear a flat wire material obtained by plastically processing at least one edge surface into a middle-high shape in the thickness direction so that the thickness direction becomes a shear direction. And then grinding the sheared surface to leave a bulged shape in the width direction due to the shearing near the grounded surface, which is the endmost portion, in a vane manufacturing method.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the vane of the present invention, the amount and shape of the bulge near the extreme end of the top surface may be determined according to the size and shape of the sagging of the counterpart member. As can be seen from the examples, there is no need for a high degree of conformity between the bulging amount and the shape. Normally, the machining sag of the counterpart member is gradually increased toward the end and sharply increased at the extreme end. The bulging shape of the vane material due to the machining method and the shearing shown in FIG. 6 is almost similar to this. These processing methods are appropriate. It is generally rare that the processing sag at the extreme end of the mating member exceeds 10 μm, usually 8 μm to 5 μm , or 3 μm or less, and the distance from the end face to the point where the processing sag becomes almost zero is: 1.5 mm or less, or
It is about 0 mm or less, usually 0.5 mm or less. Therefore, the bulging shape of the end of the vane is the same as above,
Alternatively, it may be smaller.

The general shape of the vane of the present invention will be described with reference to FIG. FIG. 1a is an example of a perspective view of a vane of the present invention,
The vane 1 has an outer shape in a substantially rectangular parallelepiped shape having two surfaces in a thickness direction (a direction perpendicular to the paper surface), both end surfaces (left and right directions in the drawing), a top surface 1a, and an edge surface opposite to the top surface 1a. is there. The top surface 1a has a middle height in the thickness direction, and at least one of the top surfaces in the vicinity of the outermost end protrudes toward the partner member (upward) as shown by 1b. However, in FIG. 1a, the bulging amount is exaggerated.

FIGS. 1c and 1d show examples of bulging shapes. For example, vanes having a shape projecting in broken lines are directly (c) or slightly flattened (d) by, for example, care using a handler. After that, those subjected to barrel processing are shown. FIG. 1b shows the cross-sectional shape of the flat wire material during the manufacturing process of the vane shown in FIG. However, the chamfered portions 30 described in FIG.
e, 30f with underfill such as 30f, and top surface 30c
May be curved surfaces 30h and 30i in FIG.
Moreover, further the top surface 1a there may be recess for receiving the spring or its end as shown by the dashed line on the opposite side (FIG. 1a), which are substantially a rectangular parallelepiped outer shape as referred to herein Is included. The term “substantially plastically worked skin” as used in the vane of the present invention refers to a plastically worked skin by hole die drawing, drawing by a roll, or rolling, or a skin that has been barrel-processed thereafter. Although FIG. 1A illustrates a case where the horizontal dimension is larger than the vertical dimension in the figure, the present invention is not limited to this. Note that the left and right surfaces in the figure are referred to as end surfaces.

Next, a method for producing the vane of the present invention will be described. In the flat bar material used in the present invention, at least one edge surface is a middle-high shape in the thickness direction corresponding to the shape of the top surface of the vane, and this surface is a surface formed by plastic working. preferable. The plastic working method is more advantageous in forming a surface having the same shape with high efficiency and high yield than the cutting and grinding methods, and therefore is advantageous in terms of the manufacturing cost of an article requiring a specific shape and precision. The material for the flat wire material is obtained by descaling the material after hot rolling, removing at least a surface layer of one edge surface which is an edge surface of the vane so that the material is free from defects such as decarburization and scratches. After that, the above-mentioned plastically processed one is desirable.

In view of the high straightness of the edge surface, the flat wire material obtained by a plastic working method in which the edge surface is pressed down with a working allowance as a substantially final cross-sectional shape forming method. desirable. Further, according to this plastic working, the surface roughness of the edge surface serving as the top surface can be set to 1.0 Rz or less, and further to 0.5 Rz or less. In order to make the surface roughness of this surface fine, a roll processing method is desirable. The bend is 1 per meter
0 mm or less, further 5 mm or less, twist is 1 per m
It is desirable that the angle is set to 0 ° or less, and more preferably 5 ° or less. In order to maintain these accuracy, cold working,
Alternatively, warm working (particularly 300 ° C. or lower) is desirable.

Important factors affecting the shape of the bulge of the top surface due to shearing are the hardness of the workpiece, the shear clearance, and the shape of the cutting edge. As work material, tool steel JIS G
4403 (SKH) and 4404 (SKS, SKT, S
In the case of KD) or the like, it was found that the hardness of the workpiece to obtain an appropriate top surface bulging shape was 25 to 45 HRC. That is, if it is less than 25 HRC, the amount of swelling tends to be excessive, and if it exceeds 45 HRC, the amount of swelling becomes insufficient and the shearing tool tends to be damaged. Desirably 27-35H
RC. 25-30 as hardened by cold working
It can easily fit in the HRC hardness range. If higher hardness is desired, when using the above tool steel as the workpiece,
Preliminary heat treatment (quenching and tempering: a continuous furnace is preferable from the viewpoint of preventing bending and surface protection) is appropriate. According to the quenching and tempering, any of the above hardnesses (25 to 45 HRC) And

The clearance δ during shearing shown in FIG. 7 is 0.02 to 0.2 m when the thickness t of the workpiece is about 2 mm.
m, preferably 0.04 to 0.08 mm,
When the thickness of the workpiece is different from 2 mm, it may be considered that the thickness is substantially proportional to the thickness. The angle θ shown in FIG. 7 may be set to about 5 ° or less in order to reduce the influence of the wear of the cutting edge, but may be set to θ = 0 °. However, when θ = 0 °, the wear width should be controlled to be 0.1 mm or less from the cutting edge, preferably 0.05 mm or less.

After the flat wire material is individually cut and sheared, a main heat treatment is performed. The main heat treatment may be performed after the shearing or after the rough grinding of the cut end surface. Of the main heat treatment, particularly, the quenching step is preferably performed in an H ₂ gas or a mixed gas atmosphere of H ₂ and an inert gas because oxidation and decarburization of the top surface are likely to occur due to high temperature. Since a trauma is likely to occur, it is desirable to use a tray that causes less collision and drop. After the main heat treatment, a grinding finish is performed. The finished surface is both end surfaces and, if necessary, the front and back surfaces, and the top surface is not ground (the surface opposite to the top surface generally does not require grinding).

An important point in the grinding of the end face is to maintain the perpendicularity accurately. As an example of a processing method for this purpose, a bulging portion of the top surface of the vane is provided on the reference surface of the jig. This is a method in which the center part except for the blade is brought into correct contact, and the angle of the vane during grinding is regulated to perform grinding. The flat wire material that is correctly plastically processed by rolling down the above-mentioned edge surface with a processing allowance can be considered that the middle and high edge surfaces and the edge surface opposite to the edge surface are exactly parallel, The surface opposite to the top surface may be used as the surface to be brought into contact with the reference surface of the jig at the time of the end surface grinding.

The total grinding allowance of the end face should be the minimum necessary to obtain an end face with sufficient accuracy, and the shearing conditions should be such that the swelling amount and the shape at this time are within the desired range. , The clearance, the angle θ, etc. should be set. Generally, both surfaces in the thickness direction are ground to obtain predetermined thickness accuracy, plane accuracy, and surface roughness. However, dripping remaining at the end of this surface at the time of individual cutting shear is not fatal and is generally allowed. The vane is generally subjected to barrel processing after the above-described processing. The purpose of this treatment is to remove fine burrs by grinding, to bevel small corners, and to improve the quality of the ground surface.

[0027]

EXAMPLE A hot-rolled flat wire material of SKH51, which is a high-speed tool steel, was prepared and annealed, and the entire peripheral surface was removed by grinding. After that, the cross-sectional shape (width) shown in FIG. It was cold-rolled to a thickness of 12 mm x 2.0 mm to obtain a material for the vane. However, in the rolling or roll die drawing method as the coil processing method, the reduction in the horizontal direction and the reduction in the edge direction may be separated and reduced alternately. In this case, it is desirable to set the reduction in the edge direction (edge direction) as the final reduction from the viewpoint of the middle and high profile of the middle and high edge surface serving as the top surface of the vane and maintaining straightness. The middle and high edge of the top surface is 1.0
It is important to have a sufficiently high surface roughness of not more than Rz, preferably not more than 0.5 Rz, and to sufficiently suppress bending and twisting.

Next, the rolled material was sheared by a high-speed press machine to a length of about 15 mm so that the thickness direction became the shear direction. When performing the temporary heat treatment, it is preferable to use a continuous quenching and tempering furnace from the viewpoint of preventing the occurrence of damage on the middle and high edge surfaces on the top surface, maintaining the straightness of the edge surfaces, and maintaining the surface roughness. The angle θ in shear was 0 °, but the wear width of the blade was kept within 0.05 mm. Subsequently, the above-mentioned individual cut and cut material is subjected to a main heat treatment of quenching and tempering in a protective atmosphere to have a hardness of about 63 HRC, followed by finish grinding and barrel treatment of the front and back surfaces and both end surfaces which are both surfaces in the thickness direction. Finished product. The grinding allowance for the finish grinding is about 0.05 mm on the front and back surfaces / one side, and about 0.2 mm on both end surfaces.
One end was ground, and the end face was ground by the perpendicularity-restricted grinding method using the aforementioned jig.

FIG. 1 is a perspective view of the entire vane after barrel processing.
(A) (However, the bulge 1b near the both ends of the top surface 1a and the bulge on the opposite edge surface are exaggerated). FIGS. 2 and 3 show examples of the measurement results of the straightness and the surface roughness of the top surface of the vane in the thickness direction center, respectively. From FIG. 2, this vane is 4 μm at one end and 3.5 μm at the other end near the outermost end.
Bulges toward the mating member side, and the bulge has almost disappeared at the points of 1.0 mm and 2.0 mm from the outermost end, respectively. 8μ
m and a high straightness of 1.0 μm or less.
From this, it can be seen that the top surface of the vane has a fine surface roughness of about 0.3 Rz. However, the straightness of the central portion can be sufficiently used as long as it is 5 μm or less for power steering of an automobile or the like, and may be 3 μm or less or 2 μm or less depending on the application.

Next, a comparative durability test was carried out for the oil pump (cam ring processing sag is about 3 μm) incorporating only the vane obtained by the above-described production method of the present invention and only the conventional vane obtained by creep feed grinding the top surface. The test was performed. During the test, all were in good condition, and the pump incorporating the vane obtained by the production method of the present invention showed no inferior point to the pump incorporating the conventional vane. The summary of the test is shown in Table 1.

[0031]

[Table 1]

FIGS. 4 and 5 show the results of measuring the straightness of the top surface of the vane and the inner surface of the cam ring obtained by combining them after the above durability test. Comparing the top straightness of the vane before the endurance test in FIG. 2 and the vane after the test in FIG. 4, the maximum swelling amounts 4 μm and 3.5 μm near the extreme end before use are 1.0 μm after the test.
It can be seen that the distance from the end face to the point where the swelling disappears has increased from 1.0 mm and 2.0 mm to 1.5 mm and 2.4 mm, respectively, as the diameters have decreased to m and 0.6 μm.

The reason that the former maximum swelling amount decreases after the test is considered to be that the maximum swelling amount was intentionally excessively increased, but decreased during use. I didn't see it. However, the reason why the bulge amounts at the outermost end after the test are 1.0 μm and 0.6 μm to 1.8 μm and 1.0 μm or less at the cam ring opening after the test in FIG. It is unknown why the distance to the point where the outgoing disappears increases. Perhaps pump start,
It is considered that the vane 1 has a process that is not parallel to the cam surface 14 as shown in FIG. 10 during a transition period such as when stopping or when switching between high pressure and low pressure. This seems to correspond to the fact that the distance to the point where the sag disappears is increased to 3.6 mm and 2.8 mm. In FIG. 10, reference numeral 18 denotes the aforementioned side block.

[0034]

As described above, the vane of the present invention has a top surface protruding near the outermost end, thereby eliminating a gap with the cam ring and improving airtightness, or reducing the sagging of a mating member. It is possible to increase the productivity by allowing a larger amount, and by eliminating the inconvenience due to the bulging of the top surface at the end, and by allowing this bulging, high efficiency and low efficiency can be achieved. It is possible to adopt a shearing method, which is a cost cutting method, and to perform end face grinding with a small grinding allowance, thereby suppressing an increase in vane processing costs. Further, the vane manufacturing invention of the present invention is a vane in which the above-described shear cutting and end grinding of a small grinding allowance are performed on a flat wire material by plastic working of a predetermined cross-sectional shape, and high-cost creep feed grinding of a top surface is omitted. Which enables low-cost production of vanes.

[Brief description of the drawings]

FIG. 1 is a perspective view (a) of a vane exaggeratedly showing a bulge 1b near the extreme end of a top surface 1a of the present invention and a diagram showing a cross-sectional shape of a vane material according to an embodiment of the manufacturing method invention (FIG. It is a figure (c, d) which shows b) and the example of a shape of a bulging part.

FIG. 2 is a view showing a result of measuring straightness of a top surface of a vane before an endurance test and a measurement procedure.

FIG. 3 is a view showing a measurement result of surface roughness of a top surface of a vane before a durability test.

FIG. 4 is a view showing the results of measuring the straightness of the top surface of the vane after the durability test.

FIG. 5 is a view showing a result of measuring straightness of an inner diameter surface of a cam ring after a durability test.

FIG. 6 is a diagram showing an example of a processing method for bulging the vicinity of the extreme end of the top surface.

FIG. 7 is a view showing a shape of a shearing tool for a vane material.

FIG. 8 is a diagram showing a structural example of a vane pump.

FIG. 9 is a diagram illustrating a creep feed grinding method.

FIG. 10 is an imaginary diagram illustrating a state of a vane in a transition period.

FIG. 11 is a diagram illustrating the proposed invention.

[Explanation of symbols]

Reference Signs List 1 vane, 1a top surface, 1b bulging part, 9 grinding wheel, 11 rotor, 12 radial groove, 13 cam ring (counterpart), 14 cam surface, 15 pump chamber, 16
Suction port, 17 discharge port, 20 arrows, 21,
2 rolls, 23 and 24 roll caliber, 30 Tairasen material, D1, arrows indicating the D ₂ direction, R the radius, t the thickness, theta angle, [delta] Clearance

Claims (6)

(57) [Claims] (1) The top surface at the middle height in the thickness direction is the mating member
The vane that holds the sealing action while sliding with
The top surface bulges toward the counterpart member near its outermost end.
Vane characterized by that. 2. It has a substantially rectangular parallelepiped outer shape, is slidably mounted on both sides and both end faces in the thickness direction thereof as guided surfaces, and is one surface perpendicular to each of these guided surfaces. The top surface is a middle height in the thickness direction, and in the vane that slides on the top surface with a mating member and maintains a sealing action, the top surface is close to at least one of the end surfaces near the mating member side. Vane characterized by bulging into Wherein the top surface is according to claim 1 or 2 of the vane remains substantially plastic working skin. 4. The method of claim 1 the height of the bulge is 10μm or less, 2 or 3 of the vane. (5) Straightness excluding the bulge at the end of the top surface
Is 5 μm or less. 6. A flat wire material obtained by plastically processing at least one edge surface into a middle-high shape with respect to a thickness direction, after shearing the flat wire material to a predetermined length so that the thickness direction becomes a shear direction, Characterized in that a bulge in the width direction due to the shearing is left in the vicinity of the ground surface, which is the outermost end, of the vane.