JP2005207586A - Light alloy spline component and surface treatment method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light alloy spline component which is improved in a surface hardness of a tooth contact surface which is spline-fitted with a multiple disc and surface treatment method thereof. <P>SOLUTION: A thermal spraying nozzle 15 is disposed facing the tooth contact surface 7 of a spline 2 in the tangential direction of a drum 1 and the drum 1 is turned in the direction that causes the tooth contact surface 7 facing the thermal spraying nozzle 15 to approach the thermal spraying nozzle 15 to form iron thermal spraying coatings from iron spraying droplets sprayed from said thermal spraying nozzle 15 on an entire circumference of the spline 2 including the facing tooth contact surface 7, a tooth bottom surface 9, and a tooth top surface 8, which are located ahead and behind the tooth contact surface 7 respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light alloy spline component such as a drum or a hub that is spline-engaged with a multi-disc used in a clutch or brake of an automatic transmission, and a surface treatment method thereof.

In order to reduce the cost and weight of spline parts such as clutch drums and clutch hubs that have been spline-engaged with multi-plate discs conventionally used in automatic transmissions, etc., these spline parts should be manufactured from a light alloy such as aluminum. Has been proposed (see Patent Document 1).
JP-A-6-74251

  By the way, when the spline parts such as a clutch drum and a clutch hub that are spline-fitted with a multi-plate disc of a clutch or a brake such as a drive plate and a driven plate are formed of a light alloy such as aluminum as in the above-described conventional example, the surface Since the hardness is low, the spline that engages with the disc may experience aggressive wear (sliding wear) due to fastening / release operation and depression wear due to transmission torque during fastening, and it is necessary to improve the surface hardness of the spline. There is.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a light alloy spline component having improved surface hardness of a tooth contact surface to be spline-fitted with a multi-plate disk and a surface treatment method thereof. And

  The present invention is a surface treatment method for a light alloy spline part that can be engaged with a multi-plate disk, and a spray nozzle is arranged in a tangential direction of the spline part so as to face the tooth contact surface of the spline. The spline component is rotated in a direction in which the directly facing tooth contact surface approaches the thermal spray nozzle, and the direct contact surface of the entire circumference of the spline component and the front and rear tooth bottoms and tooth tips of the spline component are sprayed from the thermal spray nozzle. An iron spray coating was formed on the surface.

  Accordingly, in the present invention, there is provided a surface treatment method for a light alloy spline component that can be engaged with a multi-plate disk, wherein a thermal spray nozzle is arranged in a tangential direction of the spline component so as to face the tooth-contact surface of the spline. The spline component is rotated in a direction in which the tooth contact surface directly facing the nozzle approaches the thermal spray nozzle, and the tooth contact surface of the entire circumference of the spline component and the tooth bottoms before and after the spline component all around by the iron spray droplets sprayed from the spray nozzle. An iron spray coating was formed on the tooth tip.

  That is, the thermal spray nozzle arranged so as to face the spline tooth-contact surface from the tangential direction of the spline part forms the film thickness of the iron spray coating on the tooth-contact surface of the spline thicker than the tooth tip surface and the tooth bottom surface. In addition, it is possible to homogenize the thermal spray coating on all the tooth contact surfaces by rotating the spline part.

  In addition, the tooth contact surface facing the thermal spray nozzle and the front and back teeth thereof facing the entire circumference of the spline component by the iron spray droplets sprayed from the spray nozzle while rotating the spline component in a direction approaching the spray nozzle. Since the iron spray coating is formed on the bottom and the tooth tip, the relative speed between the spline component and the sprayed iron spray droplets increases, and the adhesion of the iron spray droplets to the tooth contact surface can be improved.

  Moreover, the tooth contact surface facing the entire circumference of the spline part and the front and rear teeth thereof by the iron sprayed droplets sprayed from the spray nozzle while rotating the tooth contact surface directly facing the spray nozzle in the direction approaching the spray nozzle. Spatter is generated by spraying the sprayed droplets from the tooth contact surface because the air spray generated by the rotation of the spline component and the spraying of the droplets flows from the tooth contact surface to the outside of the spline component in order to form an iron spray coating on the bottom and tooth tips. Can be prevented from adhering to the other tooth contact surface facing each other, and the surface roughness of the tooth contact surface is not reduced.

  Hereinafter, a light alloy spline part and a surface treatment method thereof according to the present invention will be described based on each embodiment.

(First embodiment)
1 to 8 show a first embodiment of a light alloy spline component to which the present invention is applied and a surface treatment method thereof, and FIG. 1 shows a drum such as a clutch and a brake as a light alloy spline component to be surface treated. 2 is a perspective view of the drum spline, FIG. 3 is a process diagram showing the working process of the surface treatment method in this embodiment, FIG. 4 is an enlarged sectional view of the spline portion, and FIGS. 5 to 10 are splines. The figure explaining the thermal spraying state in the iron spraying process to the tooth contact surface of FIGS. 11-16 is a figure explaining the barrel grinding | polishing process of an iron spraying surface.

  First, a drum such as a clutch or a brake as a light alloy spline part subjected to surface treatment will be described with reference to FIGS. 1 and 2. A drum 1 shown in FIG. 1 is manufactured entirely by die-casting using an aluminum alloy, and includes a cylindrical portion having a spline 2 formed on the outer peripheral side. The spline 2 includes spline teeth 4A of a plurality of disks 4. It is engaged so as to be movable in the axial direction.

  The plurality of disks 4 are alternately stacked with the disk 5 engaged with the spline 6A of the clutch drum 6 (transmission case in the case of a multi-plate brake) by a spline tooth 5A on the outer peripheral side in the case of a multi-plate clutch, When both are brought into contact with each other, they are brought into a fastening state where torque can be transmitted, and when both are released, they are brought into a released state. As shown in the figure, when the disc 4 is engaged with the outer peripheral side spline 2 of the drum 1, the drum 1 may be referred to as a clutch hub (or a brake hub in the case of a multi-plate brake). Here, such a case is referred to as a drum.

  As shown in FIG. 2, the spline 2 of the drum 1 and the spline teeth 4A of the disk 4 are inclined so as to open to the outer peripheral side of the drum 1, and further, on the tooth contact surface 7 of the spline 2 extending in the axial direction. On the other hand, the spline teeth 4A of the disk 4 are in contact with each other by a thin contact area corresponding to the plate thickness.

  Therefore, when the clutches and brakes are engaged / released and the discs 4 and 5 move in the axial direction between the close contact position and the open position, the disc 4 against the tooth contact surface 7 of the spline 2. However, there is a possibility that aggressive wear may occur due to the sliding movement in the axial direction while changing the contact position while maintaining the contact state. Further, according to the transmission torque between the disks 4 and 5, the spline teeth 4A of the disk 4 are pressed against the tooth-contact surface 7 of the spline 2 by the contact area corresponding to the plate thickness, and there is a risk of causing depressed wear according to the surface pressure. There is.

  Therefore, as shown in FIG. 3, the surface of the spline 2 of the drum 1 (spline tooth contact surface) is subjected to iron spraying in the iron spraying process to improve the surface hardness of the light alloy spline, and then the iron sprayed surface is barreled. The polishing process is finished in the polishing process. FIG. 4 shows a cross section of the spline 2 of the drum 1, and the film thickness of the iron sprayed coating 10 on the tooth contact surface 7 of the spline 2 is different from that of, for example, the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2. By increasing the thickness of the iron sprayed film, aggressive wear and depressed wear are suppressed. That is, even if the drum 1 is made of a light alloy, the weight of the entire drum 1 is reduced by iron spraying the tooth contact surface 7 that needs to be improved in hardness.

  Next, based on FIGS. 5-10, the thermal spraying state in the iron thermal spraying process to the tooth-contact surface of a spline is demonstrated. FIG. 5 and FIG. 6 are schematic views of the thermal spraying state in the iron spraying process on the tooth-contact surface of the spline, and FIG. 7 is a characteristic diagram showing the ratio of the coating thickness on each part of the spline at the time of thermal spraying in comparison with the comparative example. 8 is a characteristic diagram showing the relationship between the spray angle on the sprayed surface and the adhesion of the sprayed coating, and FIGS. 9 and 10 are sectional views showing the iron sprayed state of the comparative example.

  As shown in FIGS. 5 and 6, in the iron spraying process, the drum 1 is held rotatably about its axis, and fixed to a surface of the spline 2 of the drum 1 by a jig (not shown) so that iron spraying is possible. The thermal spray nozzle 15 is arranged. The spray angle of the spray nozzle 15 is offset from the center of the drum 1, and the tooth contact surface 7 on one side of the spline 2 of the drum 1 is opposed to the surface of the drum 1 in a substantially tangential direction or slightly inward from the tangential direction. It is arranged.

  When spraying molten iron from the thermal spray nozzle 15, the drum 1 is moved in the direction opposite to the thermal spray direction of the thermal spray nozzle 15, that is, the tooth contact surface 7 on one side of the spline 2 advances toward the thermal spray nozzle 15. Rotate. By doing in this way, the iron sprayed coating 10 can be mainly formed on the tooth contact surface 7 on one side of the spline 2, and the sprayed droplets are formed on the other tooth contact surface 7A facing the one side of the spline 2. It can be set as the state which does not adhere and hardly forms the iron sprayed coating 10.

  Then, the spray nozzle 15 is moved in the axial direction of the drum 1 while spraying iron spray droplets from the spray nozzle 15 while rotating the drum 1 and spraying mainly on the tooth contact surface 7 on one side of the spline 2 of the entire circumference of the drum 1. Move gradually to. Alternatively, the drum 1 is gradually moved in the axial direction while the movement of the thermal spray nozzle 15 is stopped. By doing in this way, a sprayed coating can be formed over the spline 2 full length of the one-side tooth contact surface 7. FIG.

  When the iron spray coating 10 is formed on the other tooth-contact surface 7A of the spline 2, the direction of the spray nozzle 15 is turned in a direction that is plane-symmetric with respect to the surface including the drum 1 axis and the spray nozzle 15. The sprayed droplets are sprayed to rotate the drum 1 in the opposite direction.

  Then, in the same manner as when the spray coating is formed on the one-side tooth contact surface 7, iron spray droplets are ejected from the spray nozzle 15 while rotating the drum 1, and the main spline 2 on one side of the entire circumference of the drum 1 is sprayed. The spray nozzle 15 is gradually moved in the axial direction of the drum 1 while being sprayed on the tooth contact surface 7A, or the drum 1 is gradually moved in the axial direction with the movement of the thermal spray nozzle 15 being stopped. A sprayed coating can be formed over the entire spline 2 of the tooth contact surface 7A. A plurality of thermal spray nozzles 15 corresponding to the rotation direction of the drum 1 may be prepared in the plane symmetry, and the thermal spray nozzles 15 to be sprayed according to the rotation direction may be selectively operated.

  As described above, when the thermal spray coating is formed, the drum 1 is rotated while spraying iron spray droplets from the thermal spray nozzle 15, so that the entire surface of the drum 1 is uniformly applied to the tooth contact surfaces 7, 7 </ b> A. Thermal spray coating can be deposited. Moreover, a uniform sprayed coating can be formed over the entire length of the spline 2 by gradually moving the axial relative position between the drum 1 and the spray nozzle 15.

  FIG. 9 shows a comparative example in which iron spray droplets from the spray nozzle 15A are ejected in the axial direction of the drum. Thus, in the case of spraying iron spray droplets perpendicularly to the surface of the drum, a thick sprayed coating is formed on the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2, and the tooth contact surface inclined obliquely of the spline 1. The film thickness of the sprayed coating 10 to 7 becomes thin. For this reason, the thermal spray coating 10 on the tooth contact surface 7 cannot be made thick enough to prevent the above-described aggressive wear and depression wear. In addition, in consideration of barrel polishing, which is a subsequent process, if it is attempted to thicken the edge portion that is the corner between the tooth contact surface 7 and the spline tooth tip surface 8 that are likely to be polished, extra portions are added to the tooth tip surface 8 and the tooth bottom surface 9. As a result, sprayed droplets are sprayed on the spline 2, and the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2 become a thick sprayed coating 10.

  On the other hand, in the arrangement of the thermal spray nozzle 15 of the present embodiment, since the iron spray droplets are jetted substantially perpendicular to the tooth contact surfaces 7 and 7A of the spline 2, the coating thickness is applied to the tooth contact surfaces 7 and 7A. It is possible to increase the thickness, and it is possible to reduce the film thickness on the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2 that is inclined without facing the injection direction. For this reason, the sprayed coating 10 on the tooth contact surface 7 can be made thick enough to prevent the above-described aggressive wear and depression wear. In addition, in consideration of barrel polishing, which is a subsequent process, it is easy to thicken the edge portion that is the corner between the tooth contact surface 7 and the tooth tip surface 8 that are easily polished, and the proof stress and strength can be sufficiently maintained.

  Moreover, in this embodiment, by rotating the drum 1, it is possible to reduce the spraying time on the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2 while maintaining the spraying time on the tooth contact surface 7. The film thickness on the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2 can be reduced without reducing the film thickness on the tooth contact surface 7. This allows the sprayed coating 10 to be formed sufficiently thick in a portion that requires the thermal spray coating 10, while a necessary minimum thickness can be formed in a portion that does not require much.

  FIG. 7 shows the ratio of the film thickness of the tooth tip surface 8 and the tooth bottom surface 9 of the iron sprayed coating 10 and the film thickness to the tooth contact surface 7 injected perpendicularly to the comparative example and the tooth contact surface 7. It is a characteristic view shown in contrast with the case where the drum 1 is further rotated. As shown in FIG. 7, in the comparative example, the film thickness of the thermal spray coating 10 on the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2 that does not require much film thickness is increased, and the tooth contact requiring the film thickness is increased. It shows that the film thickness on the surface 7 is reduced.

  On the other hand, when iron sprayed droplets are sprayed perpendicularly onto the tooth contact surface 7 as in the first embodiment, the film thicknesses on the tip surface 8 and the bottom surface 9 of the spline 2 are reduced and conversely. The film thickness on the tooth contact surface 7 can be increased. When the drum 1 is further rotated in a direction opposite to the thermal spray nozzle 15 during thermal spraying as in the second embodiment, the tip surface 8 of the spline 2 and the tip surface 8 of the spline 2 are reduced without reducing the film thickness on the tooth contact surface 7. The film thickness on the root surface 9 can be reduced.

  FIG. 8 shows the relationship between the spray angle relative to the spray surface and the coating adhesion. FIG. 8 shows that the film adhesion force increases when the spray angle with respect to the spray slope is substantially vertical, and the film adhesion force decreases as the spray angle decreases.

  From this result, in the comparative example, since the iron sprayed droplets are sprayed so as to face the tooth tip surface 8 and the tooth bottom surface 9 of the spline 2, the film adhesion force to the inclined tooth contact surface 7 cannot be increased. .

  However, when the iron sprayed droplets are sprayed so as to face the tooth contact surface 7 as in the first embodiment, the film adhesion force on the tooth contact surface 7 at which the spray angle with respect to the molten slope is substantially vertical is obtained. Can be high.

  In addition, as described in the second embodiment, as described above, when the drum 1 is rotated so that the tooth contact surface 7 of the spline 2 on which the thermal spray coating is to be formed approaches the thermal spray nozzle 15, the tooth contact surface 7. The relative velocity between the sprayed melt-sprayed droplets can be increased, and the adhesion of the film to the tooth contact surface 7 can be further strengthened as shown by the broken line.

  Further, in the comparative example, as shown in FIG. 10, when the sprayed iron droplet sprayed onto the spline 2 and reaches the tooth bottom surface 9 of the spline 2 rebounds, excess spatter is applied to the tooth contact surface 7 due to the flow of the air flow caused by spraying. The adhesion of the film to the tooth contact surface 7 deteriorates and the surface roughness deteriorates.

  On the other hand, in this embodiment, due to the spraying droplet spray direction and the rotation of the drum 1, the air current around the drum 1 flows along the tooth contact surface 7 from the tooth bottom surface 9 of the spline 2 as shown in FIG. Since it flows to the outer peripheral side, spatter generated when sprayed on the tooth contact surface 7 is carried to the outer peripheral side of the drum 1. For this reason, it is possible to prevent spatter from adhering to the other tooth contact surface 7 </ b> A facing the tooth contact surface 7 forming the thermal spray coating 10. Accordingly, the adhesion of the film to the tooth contact surface 7A does not decrease and the surface roughness is also maintained well.

  Next, the barrel polishing process of the iron sprayed surface will be described based on FIGS. FIG. 11 is a schematic diagram showing an outline of a polishing apparatus in a barrel polishing process of an iron sprayed surface, FIG. 12 is a cross-sectional view illustrating a contact state of a polishing stone to an iron sprayed portion, and FIGS. 13 and 14 are spline tooth contact surfaces FIG. 15 is a characteristic diagram showing changes in the surface roughness of the sprayed surface with respect to the drum rotation direction and polishing time, and FIG. 16 is a cross-sectional view illustrating the barrel polishing state of the comparative example. FIG.

  In the barrel polishing step, the surface roughness of the tooth contact surface 7 of the spline 2 on which the iron spray coating 10 of the drum 1 is formed is improved. In barrel polishing, as shown in FIG. 11, the drum 1 is fixed by a jig 17 coaxially with a rotation shaft 16A in a barrel tank 16 having a rotatable polygonal cross section, and quartz stone, sand, granite, etc. are placed in the barrel tank 16. 50% to 60% of an artificial spherical media particle 18 such as natural or aluminum oxide (hereinafter referred to as a grinding stone) and a compound obtained by dissolving acid, alkalinity, soap, etc. with water is placed in the barrel tank 16. Is rotated around the rotating shaft 16A at a speed of 10 to 200 rpm to polish the surface of the drum 1. As shown in FIG. 12, the grinding stone 18 abuts on the tooth contact surface 7 facing the rotation direction of the drum 1 rotating together with the barrel tank 16 and mainly polishes the tooth contact surface 7.

  A larger size of the polishing stone 18 is desirable because polishing energy can be increased. However, if the polishing stone 18 is too large, the edge that is the corner between the tooth contact surface 7 and the tip surface 8 of the spline 2 is likely to be worn away. There is a possibility that 18 is less likely to positively hit the tooth contact surface 7 and is difficult to be polished, and it is not possible to polish to the back of the tooth contact surface 7 as shown in FIG.

  For this reason, a spherical body having a radius of roundness R at the corner connecting the tooth contact surface 7 and the tooth bottom surface 9 of the spline 2 is used. When the polishing stone 18 is of this size, there is a high possibility that the polishing stone 18 will positively hit the tooth contact surface 7 and it is easy to be polished. As shown in FIG. As shown in FIG. 14, it is possible to reduce wear of the edge portion which is an angle between the tooth contact surface 7 and the tooth tip surface 8 of the spline 2.

  FIG. 15 shows changes in coating surface roughness with respect to the polishing time of the barrel contact 16 and the tooth contact surface 7 facing in the rotation direction of the drum 1 and the tooth contact surface 7A as the back surface in the rotation direction. As shown in FIG. 15, the tooth contact surface 7 facing in the rotation direction has a coating surface roughness that decreases with the lapse of the polishing time, while the tooth contact surface 7 </ b> A that is the back surface in the rotation direction becomes the film surface even with the lapse of the polishing time. The roughness is not so low. For this reason, after the barrel tank 16 is rotated forward at predetermined time intervals, the barrel tank 16 is reversed to switch to the tooth contact surface 7A to be polished and polished, and the barrel tank 16 is rotated forward and backward for polishing. Let's make it.

  In the present embodiment, the following effects can be achieved.

  (A) A surface treatment method for a light alloy spline component that can be engaged with the multi-plate disk 4. The thermal spray nozzle 15 is made to face the tooth contact surface 7 of the spline 2 from the tangential direction of the drum 1 that is the spline component. The iron spray coating is formed on the tooth contact surface 7 of the spline 2 and the front and back tooth bottom surfaces 9 and the tooth tip surface 8 of the spline 2 by the iron spray droplets sprayed from the spray nozzle 15.

  That is, the film thickness of the iron sprayed coating 10 on the tooth contact surface 7 of the spline 2 is changed from the tangential direction of the drum 1 to the tooth contact surface 7 of the spline 2 by the spray nozzle 15. It can be formed thicker than the bottom surface 9.

  In addition, the air flow generated by the spraying of the droplets flows from the tooth contact surface 7 to the outside of the spline part, and the sprayed spray drops from the tooth contact surface 7 and the generated spatter adheres to the other tooth contact surface 7A opposite to it. This can be prevented and the surface roughness of the tooth contact surface 7A is not lowered.

  (A) The drum 1 which is a spline component is rotated in a direction in which the tooth contact surface 7 facing the thermal spray nozzle 15 approaches the thermal spray nozzle 15, and the tooth contact surface 7 facing the thermal spray nozzle 15 and the front and rear thereof Since the iron spray coating 10 is formed on the tooth bottom surface 9 and the tooth tip surface 8, the relative speed between the spline 2 and the sprayed iron spray droplet is increased, and the adhesion force of the iron spray droplet to the tooth contact surface 7 is improved. Can be made. Moreover, the sprayed coating 10 to all the tooth contact surfaces 7 can be homogenized by rotating the spline 2.

  In addition, the spline part 1 is directly opposed to the peripheral spline 2 by the iron sprayed droplets sprayed from the spray nozzle 15 while rotating the tooth contact surface 7 facing the spray nozzle 15 in a direction approaching the spray nozzle 15. Since the iron spray coating 10 is formed on the tooth contact surface 7 and the front and back tooth bottom surfaces 9 and the tooth tip surface 8, the air flow generated by the rotation of the spline component and the spray of the droplets flows from the tooth contact surface 7 to the outside of the spline component. It is possible to prevent the spatter splashed from the flow and sprayed droplets from the tooth contact surface 7 from adhering to the other tooth contact surface 7A, and the surface roughness of the tooth contact surface 7A is not reduced.

  (C) A spray nozzle 15 is arranged from the tangential direction of the drum 1, which is a spline component, to face the tooth contact surface 7A of the spline 2 where the iron spray coating 10 is not formed. Rotating in the opposite direction and facing the tooth contact surface 7A of the entire circumference spline 2 by the iron spray droplets sprayed from the spray nozzle 15 facing the tooth contact surface 7A on which the iron spray coating 10 is not formed and its front and back Since the iron spray coating 10 is formed on the tooth bottom surface 9 and the tooth tip surface 8, the effects (a) and (a) can be obtained also on the tooth contact surface 7 </ b> A on the opposite side.

  (D) The iron sprayed coating 10 is easily formed during barrel polishing, which is a subsequent process, by forming a thick surface at the tooth contact surface 7 of the spline 2 and at the corner between the tooth contact surface 7 and the tooth tip surface 8. The proof strength and strength of the edge portion that is the corner between the tooth contact surface 7 and the tooth tip surface 8 can be sufficiently maintained.

  (E) The spline 2 of the drum 1 which is a spline part on which the iron spray coating 10 is formed is splined by barrel polishing with a sphere having a radius of roundness of the corners of the tooth contact surface 7 and the tooth bottom surface 9 as a polishing stone 18. 2 Since the surface is finished flat, the possibility that the grinding stone 18 will positively hit the tooth contact surface 7 is increased and it is easy to be polished, and it is possible to polish to the back of the tooth contact surface 7 while securing the polishing energy. It is possible to reduce wear of the edge portion which is an angle with the tooth tip surface 8 of the spline 2.

  (F) The drum 1 which is a spline part is fixed in the barrel tank 16 coaxially with the rotation axis 16A of the barrel tank 16, and the barrel tank 16 is rotated forward and backward around the rotation axis 16A so that the surface of the spline 2 is covered. In order to finish the surface, even if it has the tooth contact surfaces 7 and 7A facing each other like the spline 2, it can be sufficiently polished.

  (G) The iron sprayed coating 10 on the spline 2 can be formed of spline parts even with a soft light alloy by forming the film thickness on the tooth contact surface 7 greater than the film thickness of the tooth tip surface 8 and the tooth bottom surface 9. , The overall weight can be reduced.

  In addition, although the drum 1 provided with the spline 2 on the outer peripheral side has been described as the spline part in the above-described embodiment, although not illustrated, it may be a spline part such as a drum provided with the spline on the inner peripheral side.

(Second Embodiment)
17 to 23 show a second embodiment of a surface treatment method for a light alloy spline part to which the present invention is applied, and FIG. 17 is a cross-sectional view of the light alloy spline part subjected to the surface treatment in the present embodiment. FIG. 18 is a process diagram showing the work process of the surface treatment method in the present embodiment, FIG. 19 is an explanatory diagram showing the iron spraying procedure for light alloy spline parts, and FIG. 20 is a roughening process, iron spraying on the inner surface spline. FIG. 21 is a cross-sectional view showing the masking state in the iron spraying process on the outer surface spline, and FIG. 22 is a cross-sectional view showing the masking parts disassembled into respective parts. is there. In the present embodiment, a masking method at the time of surface treatment of a light alloy spline part is added. The same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIG. 17, the light alloy spline component in the present embodiment is intended for the drum 1 having splines 2A and 2B on the inner and outer peripheral surfaces. Although not shown, in the gear train of the automatic transmission, The splines 2A and 2B on the inner peripheral side are engaged with the external splines of the disc that is a multi-plate of the built-in clutch mechanism, and the splines on the outer peripheral side are those of the disc that is a multi-plate of another clutch mechanism or brake mechanism. An internal spline is configured to be engaged. In such a clutch drum 1, the surface treatment is performed on the splines 2A and 2B on the inner and outer peripheral surfaces of the drum 1 through the work process shown in FIG.

  In the surface treatment step in FIG. 18, a roughening treatment is performed to roughen the surfaces of the inner and outer splines 2A and 2B that form the iron spray coating of the workpiece by the roughening step, and then the inner surface spline iron spraying step and the outer surface. An iron sprayed coating is formed on the inner surface spline 2B and outer surface spline 2A roughened by the spline iron spraying step, and finally the iron sprayed coating on the surface of the spline is polished in the polishing step.

  As shown in FIG. 22, the masking jig 20 used in each step includes a masking jig 20 </ b> A that fits the shaft hole and the outer peripheral surface of the drum 1 and covers the back surface of the drum 1, and a piston slide of the drum 1. A masking jig 20B that fits into the moving surface and the shaft hole and covers the cylinder portion, and a masking jig 20C that fits into the opening of the cylindrical portion where the inner peripheral spline 2B of the drum 1 is formed and closes the opening. And a rotary shaft 20D that engages with the masking jig 20A and is attached to the chuck of the rotary table T of the processing machine.

  The masking jig 20A and the masking jig 20B can be connected to each other by engaging the screw 22 provided on the jig 20B with the screw hole 21 provided on the jig 20A in the shaft hole of the drum 1. . The masking jig 20B and the masking jig 20C can be connected to each other by engaging a screw 23 provided on the jig 20C with a screw hole 24 provided on the jig 20B. Further, the masking jig 20A and the rotating shaft 20D can be connected to each other by engaging a screw 25 that is coaxial with the drum 1 and protrudes outward from the masking jig 20A into the screw hole 26 of the rotating shaft 20D. .

  Then, in the roughening step and the inner surface spline iron spraying step, as shown in FIG. 20, the inner peripheral spline surface 2B and the outer peripheral spline surface 2A on which the thermal spray coating of the drum 1 as the work is formed are exposed and masked. The jig 20A and the masking jig 20B are connected and used. Further, the rotary shaft 20D is connected to the masking jig 20A, and the rotary shaft 20D is fastened to the chuck of the rotary table T of the processing machine. The drum 1 as a workpiece has the inner and outer peripheral splines 2A and 2B exposed to the outside, and the exposed inner and outer peripheral splines 2A and 2B can be roughened in the roughening step.

  Further, in the iron spraying process on the inner surface spline surface 2B, an iron spray nozzle 15 is inserted into the inner surface of the drum 1, and the drum 1 is rotated to one side (for example, clockwise rotation R) as described in the first embodiment. On the other hand, an iron spray droplet 30 is ejected from the nozzle 15 positioned so as to face the rotation direction, and first, an iron spray coating is formed over the entire circumference and the entire spline centering on one tooth contact surface. In this case, the iron spray droplet 30 by the nozzle 15 is sprayed with a secondary angle as shown in FIG.

  Next, the rotation direction and the injection direction are reversed (for example, counterclockwise L), the iron sprayed droplet 31 is sprayed from the nozzle 15, and the iron sprayed coating has the entire circumference and the spline total length around the other tooth contact surface. It is formed. Also in this case, the iron spray droplet 31 by the nozzle 15 is sprayed with a secondary angle as shown in FIG.

  Since the iron spray droplet in the above is sprayed on the inner surface of the drum 1, the sputter of the iron spray droplet is partially scattered from the opening of the drum 1. It does not adhere to the surface of the outer peripheral spline 2A of the drum 1. Therefore, the adhesion force of the iron spray coating to the surface of the outer peripheral spline 2A, which is made in a later process, is not reduced. In addition, when the iron sprayed coating is formed by spraying iron spray droplets on the inner peripheral spline 2B surface, the spatter of the scattered spatter does not substantially adhere to the outer peripheral spline 2A surface. In order to prevent this, a cylindrical masking jig 20E as shown by a chain line in FIG. 20 may be used in combination.

  In the iron spraying process on the surface of the outer peripheral spline 2A, as shown in FIG. 21, a masking jig 20C is further connected to the masking jig 20B and added. The masking jig 20C closes the opening of the drum 1 and seals the surface of the inner peripheral spline 2B. In this state, as shown in FIG. 19, as in the first embodiment, the iron spray droplet 32 is ejected from the nozzle 15 while rotating the drum 1 (for example, the right rotation R). The iron spray coating is formed over the entire circumference and the entire spline as the center, and then the iron sprayed droplet 33 is ejected from the nozzle 15 by reversing the rotation direction and the injection direction (for example, counterclockwise rotation L). An iron sprayed coating is formed over the entire circumference and the entire spline centering on the tooth contact surface. Sputtering of iron spray droplets in this iron spraying process does not adhere to the inner spline 2B surface because of the masking jig 20C, and prevents deterioration of surface roughness due to secondary adhesion on the spray coating. It is possible to shorten the polishing time in the subsequent process.

  In the polishing step, the iron spray coating on the inner and outer peripheral splines 2A and 2B of the drum 1 is polished in the masking state shown in FIG. 20 with the masking jig 20C removed.

  In the surface treatment method for light alloy spline parts in the present embodiment described above, when forming an iron spray coating by spraying iron spray droplets on the inner and outer peripheral splines 2A, 2B, when spraying to either one The other spline surface is isolated by a masking jig 20C or a masking jig 20E so as to prevent adhesion of spatter. For this reason, when the surface of the spline is a roughened surface, it is possible to prevent secondary adhesion to the surface, and it is possible to prevent a decrease in the adhesion of the iron spray coating performed in a subsequent process. Moreover, when the spline surface is a coating surface on which an iron spray coating has already been formed, secondary adhesion of spatter onto the spray coating can be prevented, and deterioration of the surface roughness of the iron spray coating can be prevented. In addition, the polishing time to be performed in the subsequent process can be shortened.

  Further, the rotating shaft 20D and the masking jigs 20A and 20B mask and drum the non-surface treated portion of the drum 1 throughout the entire surface treatment process from the roughening process to the polishing process of the drum 1 which is a workpiece. Since 1 is driven to rotate, there is no need for an extra step such as replacement to the drum 1.

  FIG. 23 shows a modification of the masking jig 20, in which the masking jig 20C and the rotating jig 20D are integrated into a masking jig 20F. The masking jig 20F is added by removing the rotating jig 20D and connecting it to the masking jig 20B in the iron spraying process on the surface of the outer peripheral spline 2A. Then, the rotary shaft of the masking jig 20F is connected to the rotary table T of the processing machine by a chuck, and the iron sprayed droplets are ejected while rotating the drum 1 by the rotary table T in the same manner as in the first embodiment. An iron spray coating can be formed on the surface. Also in this masking jig 20F, the spattering of the iron spray droplets in the iron spraying process does not adhere to the surface of the inner peripheral spline 2B, and the surface roughness deterioration due to the secondary adhesion on the sprayed coating can be prevented. The polishing time in the subsequent process can be shortened.

  In the present embodiment, in addition to the effects (a) to (ki) in the first embodiment, the following effects can be achieved.

  (H) The spline component includes spline teeth 2A and 2B on the inner and outer circumferences of the drum 1 which is a cylindrical member, and the outer circumferential side spline 2A or inner circumferential side spline on the back side prior to the formation of the thermal spray coating by the iron spray droplets. 2B is covered with masking members 20C and 20E, and a sprayed coating is formed on the inner peripheral side spline 2B or the outer peripheral side spline 2A in the masking state, so that the surface of the spline is a roughened surface on which no thermal sprayed coating has yet been formed. In such a case, secondary adhesion to the surface can be prevented, and a decrease in the adhesion of the iron sprayed coating formed in the subsequent process can be prevented. Moreover, when the spline surface is a coating surface on which an iron spray coating has already been formed, secondary adhesion of spatter onto the spray coating can be prevented, and deterioration of the surface roughness of the iron spray coating can be prevented. In addition, the polishing time to be performed in the subsequent process can be shortened.

  (K) The masking members 20A, 20B and 20D expose both the inner and outer peripheral splines 2A and 2B in the roughening step performed prior to the formation of the thermal spray coating by iron spraying, and the inner and outer peripheral splines 2A and 2B in the iron spraying step. Since either one of 2B is alternately exposed and both the inner and outer peripheral splines 2A and 2B are exposed in the subsequent polishing process, an extra process such as replacement to the drum 1 as a work is required. There is no.

  (E) The masking member is additionally mounted so as to cover the members 20A, 20B, and 20D that are mounted on the spline component between the roughening process and the polishing process, and the back side spline of the sprayed surface during the spraying process. Since the members 20C and 20E are configured, it is only necessary to add a target member according to the inner and outer peripheral surfaces forming the iron sprayed coating.

1 is a schematic cross-sectional view of a light alloy spline component showing an embodiment of the present invention. The schematic perspective view of the spline parts made from a light alloy. Process drawing which shows the operation | work process of the surface treatment method in this embodiment. The expanded sectional view of the spline of a spline component. The schematic diagram of the thermal spraying state in the iron thermal spraying process to the tooth contact surface of a spline. The schematic diagram of the air current state in the iron spraying process to the tooth contact surface of a spline. The characteristic view which shows the film thickness ratio to each part of a spline at the time of thermal spraying as contrasted with a comparative example. The characteristic view which shows the relationship between the spraying angle to a sprayed surface, and the adhesive force of a sprayed coating. Sectional drawing which shows the iron spraying state of a comparative example. Sectional drawing which shows the airflow state at the time of iron dissolution of a comparative example. The schematic diagram which shows the outline of the grinding | polishing apparatus in the barrel grinding | polishing process of an iron sprayed surface. Sectional drawing explaining the contact state of the grinding stone to an iron spraying part. Sectional drawing explaining the contact state of the grinding stone to the iron spraying part tooth bottom side. Sectional drawing explaining the contact state of the grinding stone to the iron spraying part tooth-tip side. The characteristic view which shows the change of the surface roughness of the sprayed surface with respect to the rotation direction and polishing time of a drum. Sectional drawing explaining the barrel grinding | polishing state of a comparative example. Sectional drawing of the spline components made from a light alloy in 2nd Embodiment of this invention. The process drawing of the work process of the surface treatment method of the light alloy spline components which shows 2nd Embodiment of this invention. Explanatory drawing which shows the iron spraying point to a light alloy spline component. Sectional drawing which shows the masking state at the time of a roughening process, the iron spraying process to an inner surface spline, and surface polishing. Sectional drawing which shows the masking state in the iron spraying process to an outer surface spline. Sectional drawing which decomposes | disassembles and shows a masking component in each components AD. Sectional drawing which shows the modification of masking components.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drum as spline parts 2 Spline 4, 5 Multi-plate disk 6 Drum 7, 7A Tooth contact surface 8 Tooth tip, tip surface 9 Tooth bottom, Tooth bottom 10 Iron spray coating 15 Spray nozzle 16 Barrel tank 18 Polishing stone 20, 20A-20F Masking member, masking jig

Claims (11)

It is a surface treatment method of a light alloy spline part that can be engaged with a multi-plate disk,
Place the spray nozzle from the tangential direction of the spline part so as to face the tooth contact surface of the spline.
A surface treatment method for a spline component made of light alloy, wherein an iron spray coating is formed on a tooth-contact surface of a spline, a front and a back of the spline, and a tooth tip thereof by an iron spray droplet sprayed from the spray nozzle. Rotate the spline part in the direction approaching the thermal spray nozzle with the tooth contact surface facing the thermal spray nozzle,
2. The surface treatment method for a light alloy spline component according to claim 1, wherein an iron sprayed coating is formed on the tooth contact surface facing the entire circumference of the spline component, and on the front and back of the tooth bottom and the tooth tip. It is a surface treatment method of a light alloy spline part that can be engaged with a multi-plate disk,
Place the spray nozzle from the tangential direction of the spline part so as to face the tooth contact surface of the spline.
The spline component is rotated in a direction in which the contact surface facing the thermal spray nozzle faces the thermal spray nozzle,
Surface treatment of a light alloy spline part, wherein an iron sprayed coating is formed on the tooth contact surface facing the entire circumference of the spline part, the front and back of the spline part, and the tooth tip of the spline part by means of an iron spray droplet sprayed from the spray nozzle. Method. A thermal spray nozzle is arranged in direct contact with the tooth contact surface on which the iron thermal spray coating of the spline is not formed from the tangential direction of the spline component,
Rotating the spline part in a direction opposite to the direction of rotation;
An iron spray coating is formed on the tooth contact surface facing the entire spline, on the front and back of the spline, and on the tip of the tooth by spraying iron spray from a spray nozzle directly facing the tooth contact surface on which no iron spray coating is formed. A surface treatment method for a light alloy spline component according to claim 2 or claim 3, wherein the surface treatment method is used.   5. The light alloy according to claim 1, wherein the iron spray coating is formed thick at a tooth contact surface of a spline and at a corner portion between the tooth contact surface and the tooth tip. Surface treatment method for spline parts.   The spline part has spline teeth on the inner and outer periphery of a cylindrical member, and covers the outer peripheral side spline on the back side or the inner peripheral side spline with a masking member prior to the formation of the thermal spray coating by the iron spray droplets, and the masking state. 6. The surface treatment method for a light alloy spline component according to claim 1, wherein a thermal spray coating is formed on the inner peripheral side spline or the outer peripheral side spline.   The masking member exposes both the inner and outer splines in the roughening step performed prior to the formation of the thermal spray coating by the iron spray, and alternately exposes one of the inner and outer splines in the iron spraying step. 7. The surface treatment method for a light alloy spline part according to claim 6, wherein both the inner and outer peripheral splines are exposed in the subsequent polishing step.   The masking member is composed of a member that is attached to the spline part between the roughening step and the polishing step, and a member that is additionally attached to cover the back side spline of the sprayed surface during the spraying step. A surface treatment method for a light alloy spline component according to claim 7.   2. The spline part on which the iron sprayed coating is formed has a spline surface finished by barrel polishing using a sphere having a radius of roundness at the corner between the tooth contact surface and the tooth bottom as a polishing stone. A surface treatment method for a light alloy spline component according to claim 8. The spline component is fixed in the barrel tank as coaxial with the rotation axis of the barrel tank,
10. The surface treatment method for a light alloy spline component according to claim 9, wherein the surface of the spline is flattened by rotating the barrel tank forward and backward about the rotation axis. It is a light alloy spline part that can be engaged with multi-plate discs,
A spline component made of light alloy, characterized in that the iron spray coating on the spline is formed so that the film thickness on the tooth contact surface is larger than the film thickness of the tooth tip and root.

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