JP2013188757A - Manufacturing method of external joint member for constant velocity universal joint and external joint member - Google Patents

Abstract

An object of the present invention is to improve the productivity of an outer joint member including a cup portion formed into a predetermined shape by ironing a cup-shaped portion of a front shape member.
A cup portion 2 having an opening at one end and a plurality of axially extending track grooves 5 formed in an inner diameter surface 4 is provided. The inner diameter surface 4 of the cup portion 2 is a cup of a front element 1 ″. This is a method for manufacturing the outer joint member 1 formed by ironing the shape portion 2'.Cup depth D on the inner diameter surface 4 of the cup portion 2 (inner diameter surface of the cup shape portion 2 '). Using the ironing punch 20 that can mold the judgment reference portions 12 and 13 for judging whether or not pass or fail, ironing is executed.
[Selection] Figure 4

Description

  The present invention is used in, for example, power transmission systems of automobiles, aircraft, ships, various industrial machines, etc., and is an outer joint for a constant velocity universal joint that transmits rotational power at a constant speed between two axes of a driving side and a driven side. The present invention relates to a member manufacturing method and an outer joint member.

  As is well known, constant velocity universal joints are broadly classified into fixed constant velocity universal joints that allow only angular displacement and sliding constant velocity universal joints that allow angular displacement and axial displacement. Regardless of whether the constant velocity universal joint is a fixed type or a sliding type, an outer joint member having a cup portion in which one end is opened and a plurality of track grooves extending in the axial direction is formed on an inner diameter surface; A joint internal component such as an inner joint member or a torque transmission member accommodated in the inner periphery of the cup portion is provided as a main constituent member. Out of these joint components, the outer joint members are manufactured using various processing methods such as machining represented by cutting and turning, and plastic working represented by forging. Since there is a limit to the improvement of the yield, plastic working is often adopted as much as possible.

  As an example, the following Patent Document 1 discloses an outer joint member of a tripod type constant velocity universal joint, which is a kind of sliding type constant velocity universal joint, in particular, a plurality of tracks having one end opened and extending axially on an inner diameter surface. A method of manufacturing an outer joint member integrally including a bottomed cylindrical cup portion having a groove and a shaft portion extending axially outward from the other end of the cup portion by plastic working is described. Specifically, a solid rod-shaped material (billet) is subjected to upsetting and the like to form an intermediate material having a large-diameter portion that eventually becomes a cup portion, and to the large-diameter portion of the intermediate material. A step of obtaining a former shape material having a cup-shaped portion roughly formed into a cup shape by extruding, and a step of forming the cup-shaped portion of the previous shape material into a finished shape and size by ironing; and Is included.

  As described above, when manufacturing an outer joint member by sequentially performing various forging processes such as upsetting, extruding, and ironing, particularly when manufacturing an outer joint member for a sliding type constant velocity universal joint. In many cases, track grooves are formed (finished) into a final shape by ironing. On the other hand, when manufacturing an outer joint member for a fixed type constant velocity universal joint, the track groove is often finished to a final shape by performing appropriate machining after completion of the ironing process.

  The ironing process described above is performed, for example, in a state where a punch having a molding die portion corresponding to the inner peripheral shape of the cup portion to be molded is arranged on the inner periphery of the cup-shaped portion of the previous raw material. This is done by pushing the cup-shaped part of the profile through the inner periphery of the die (the outer diameter surface of the cup-shaped part is squeezed with the die). When the ironing process is completed, the shape of the outer joint member (final forged product) in which the axial dimension of the cup-shaped part is longer than the axial dimension before the ironing process and the inner diameter surface is finished to a predetermined shape. Is obtained. In general, since the weight and volume between billets vary, the axial dimension (cup depth) of the cup-shaped portion after ironing varies between the base materials. Therefore, after the ironing process is completed, it is inspected whether the cup depth is within the tolerance range, and only acceptable products whose cup depth is within the tolerance range are delivered to a subsequent process such as a heat treatment process. I have to.

JP 2002-213476 A

  Conventionally, the inspection of whether or not the cup depth is within the tolerance range (judgment determination of the cup depth) is performed by a dedicated measuring instrument 100 as shown in FIG. A combination of a scale 102 and a jig 101 having a substantially T-shaped cross section composed of an axial portion 101a having a portion and a radial portion 101b having a contact portion with an inner diameter surface of the cup portion). However, the measurement result is executed by comparing with the dimensional standard for each product.

  However, in this case, it is necessary to follow the procedure of installing the measuring instrument 100 → reading the scale 102 → removing the measuring instrument 100. In addition, in order to make an accurate pass / fail judgment, the jig 101 and the scale 102 are accurately positioned. It is necessary to pay particular attention to the reading of the scale 102 as well as the arrangement. For this reason, there is a problem that much labor is required to determine whether or not the cup depth is acceptable, and the productivity of the outer joint member cannot be effectively increased. In addition, since the readings of the scale 102 are likely to vary (individual differences), there is a problem to be improved in order to improve the accuracy of the pass / fail judgment.

  In view of such circumstances, the present invention aims to improve the workability and accuracy of the pass / fail determination of the outer joint member including the cup portion formed by ironing, thereby contributing to the improvement of the productivity of the outer joint member. Objective.

  The outer joint member manufacturing method according to the present invention created to achieve the above object comprises a cup portion having one end opened and a plurality of track grooves extending in the axial direction on the inner diameter surface. Is a method for manufacturing an outer joint member for a constant velocity universal joint having a molding surface formed by ironing the cup-shaped portion of the former raw material, and a determination for determining pass / fail of the cup depth Ironing is performed using a molding die that can mold the reference portion on the molding surface. In addition, “the cup-shaped portion of the front element” in the present invention is formed into a shape approximate to the cup portion of the final product (outer joint member) through sequential forging processes such as upsetting and extrusion. It is a part (part). The same applies to the outer joint member according to the present invention described below.

  Further, an outer joint member according to the present invention created to achieve the above object includes a cup portion having one end opened and a plurality of track grooves extending in the axial direction on an inner diameter surface, the cup portion being An outer joint member for a constant velocity universal joint having a molding surface formed by ironing the cup-shaped portion of the former shape material, and having a judgment reference portion for judging pass / fail of the cup depth. In addition, the determination reference portion is molded on the molding surface simultaneously with the ironing process.

  According to the above-described configuration of the present invention, after the ironing process is completed, whether or not the cup depth is acceptable, that is, whether or not the cup depth is within the dimensional tolerance, is visually confirmed by the presence / absence of the determination reference portion and the formation mode. It is possible to make a determination with More specifically, if a predetermined reference portion is molded on the molding surface of the cup portion (cup-shaped portion), the cup depth can be determined to be within the tolerance range, while the cup If the determination reference portion is not molded in a predetermined manner on the molding surface of the portion (cup-shaped portion), it can be determined that the cup depth is not within the tolerance range. Therefore, it is not necessary to perform the pass / fail determination of the cup depth using the dedicated measuring instrument 100 as shown in FIG. 9, and it is possible to easily perform the pass / fail determination of the cup depth and improve the determination accuracy. be able to. Thereby, the productivity improvement of an outer joint member can be aimed at.

  In the method for manufacturing the outer joint member according to the present invention, when performing the ironing process, it is possible to use a molding die that can mold the determination reference portions at two locations spaced apart in the axial direction of the molding surface. When ironing is performed using such a method, the judgment reference part molded on the other end side of the cup part (opposite opening end part side) should be used as a part indicating the tolerance lower limit of the cup depth. Can be used as a part indicating the upper limit of the tolerance of the cup depth, so that the cup depth can be reduced after the ironing process is completed. It becomes possible to determine more accurately whether or not it is within the tolerance range. More specifically, it can be determined that the cup depth is within the tolerance range if the determination reference portion is molded in a predetermined manner at one location in the axial direction of the molding surface. And if the determination reference part is molded in a predetermined manner at two locations separated in the axial direction of the molding surface, it can be determined that the cup depth is a rejected product exceeding the tolerance range, If the determination reference portion of the predetermined mode is not molded on the molding surface, it can be determined that the cup depth is a rejected product that is below the tolerance range.

  Moreover, the manufacturing method of the outer joint member which concerns on this invention can further include the edge part removal process which removes the predetermined dimension of the one end part (opening edge part) of a cup part after ironing, This edge part removal In the process, one end portion of the cup portion can be removed by reaching an axial position where the entire determination reference portion is removed. That is, the determination reference portion molded on the molding surface of the cup portion by ironing can be used as a mark when finishing by removing a predetermined dimension in the axial direction at one end portion of the cup portion.

  The determination reference part can take any form as long as it does not hinder the function of the outer joint member. For example, it can be provided continuously in the circumferential direction of the cup part (provided over the entire circumference of the cup part), or can be provided intermittently in the circumferential direction of the cup part. In addition, the determination reference portion is, for example, a step portion having a height difference of 0.01 mm to 1.0 mm, a projecting portion having a height dimension of 0.01 mm to 1.0 mm, or a depth dimension of 0.01 mm or more. It can be composed of a concave portion of 1.0 mm or less. The lower limit value of the height difference, height dimension, or depth dimension (hereinafter referred to as “height difference etc.”) of the judgment reference portion is set to 0.01 mm, so that the pass / fail judgment of the cup depth is executed accurately and quickly. For this reason, if the height difference is as small as less than 0.01 mm, there is a high possibility that the pass / fail determination of the cup depth cannot be performed accurately and quickly. In addition, the upper limit value of the height difference of the judgment reference part is set to 1.0 mm because when the height difference exceeds 1.0 mm, the releasability of the cup part (cup-shaped part), and thus the molding accuracy of the cup part. This is because there is a possibility that it will have an adverse effect.

  The present invention can be applied to an outer joint member in which a track groove is formed by a linear portion extending in parallel with a joint axis, that is, an outer joint member for a sliding type constant velocity universal joint. Examples of applicable sliding constant velocity universal joints include tripod type constant velocity universal joints (TJ) and double offset type constant velocity universal joints (DOJ). In addition, the present invention provides a track portion in which the track groove is relatively positioned on one end side (opening end side) of the cup portion and extends in parallel with the joint axis, and relatively on the other end side (reverse side) of the cup portion. It is applied to an outer joint member composed of an arcuate portion located on the opening end side), that is, an outer joint member for an undercut-free constant velocity universal joint (UJ) which is a kind of fixed type constant velocity universal joint. You can also. In any of the types of outer joint members for constant velocity universal joints exemplified above, the linear portion of the track groove is formed with a molding surface formed by ironing the cup-shaped portion of the former raw material. can do.

  A constant velocity universal joint can be configured by the outer joint member according to the present invention described above and the joint internal parts accommodated in the inner periphery of the cup portion.

  In the configuration of the present invention described above, the ironing process may be performed in any atmosphere of cold, warm, or hot, but if it is performed cold, it is warm or hot. Compared with the case where it is carried out, the molding accuracy of the cup part (the accuracy of the ironing process) can be improved.

  As described above, according to the present invention, it is possible to improve the workability and accuracy of the pass / fail determination of the outer joint member including the cup portion formed by ironing, thereby contributing to the productivity improvement of the outer joint member. Can do.

(A) A figure is a front view of the outside joint member for constant velocity universal joints concerning one embodiment of the present invention, and (b) figure is an AA line arrow sectional view in (a) figure. (A)-(d) figure is a conceptual diagram which shows a pre forge process in steps among the various manufacturing processes for manufacturing the outer joint member shown in FIG. It is a front view of a front element. It is sectional drawing which shows a ironing process process typically. (A) The figure is a schematic sectional view of a shaped member having a cup portion whose cup depth is below the tolerance lower limit, and (b) is a drawing of the shaped material having a cup portion whose cup depth exceeds the tolerance upper limit. It is a schematic sectional drawing. Both (a) figure and (b) figure are schematic sectional drawings of the outer joint member which concerns on other embodiment of this invention. It is a front view of the outside joint member concerning other embodiments of the present invention. It is a schematic sectional drawing of the outer joint member by which the edge part removal process was performed after the ironing process. It is a figure which shows typically the mode of the conventional inspection method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, for the sake of convenience, an embodiment of the outer joint member according to the present invention will be described first with reference to FIG. 1. Subsequently, an embodiment of the method for manufacturing the outer joint member according to the present invention will be described with reference to FIGS. This will be described with reference to FIG.

  FIG. 1A shows a schematic front view of an outer joint member 1 for a constant velocity universal joint according to an embodiment of the present invention (hereinafter, simply referred to as “outer joint member 1”), which is the same as FIG. 1 is a schematic cross-sectional view of the outer joint member 1 (A-A schematic cross-sectional view of FIG. 1A). This outer joint member 1 is an outer joint member for a tripod type constant velocity universal joint (TJ) which is a kind of sliding type constant velocity universal joint that allows both angular displacement and axial displacement, and one end is open. The bottomed cylindrical cup portion 2 and the shaft portion 3 extending axially outward from the other end (the opposite opening end portion) of the cup portion 2 are integrally provided. The tripod type constant velocity universal joint is configured by incorporating a tripod member as an inner joint member, a roller as a torque transmission member, or the like on the inner periphery of the cup portion 2 of the outer joint member 1.

  Three track grooves 5 extending in the axial direction are formed at equal positions in the circumferential direction of the inner diameter surface 4 of the cup portion 2. Each track groove 5 has a pair of roller guide surfaces 6 and 6 which face each other in the circumferential direction, and is formed in a straight line including the roller guide surfaces 6 and 6 and extending in parallel with the joint axis. As is clear from FIG. 1 (a), the cross section perpendicular to the axis of the cup portion 2 of the present embodiment is a corolla shape in which three large diameter portions and three small diameter portions are alternately arranged in the circumferential direction. The track groove 5 is formed on the inner periphery of each large diameter portion. In an actual product, in order to allow the angular displacement of the joint in the region between the track grooves 5 and 5 on the inner periphery of the opening of the cup portion 2 (to avoid interference with a shaft extending from a tripod member not shown). Although an entrance chamfer is provided, the illustration thereof is omitted in FIG. In an actual product, an annular groove for fitting one end of a boot that seals the inside of the joint is provided on the outer diameter surface of the cup portion 2, but the illustration thereof is omitted in FIG. 1.

  Although the details will be described later, the outer joint member 1 is subjected to plastic processing steps such as extrusion processing, upsetting processing, and ironing processing in order to obtain a substantially finished product-shaped material 1 ′ (two-dot chain line in FIG. 4). Is obtained by performing an appropriate finishing process and further a heat treatment. The entire inner diameter surface 4 of the cup portion 2 including the track groove 5 and the roller guide surface 6 is formed into a final shape by ironing the cup-shaped portion 2 ′ (see FIG. 3) of the front raw material 1 ″. Note that the opening-side end surface 7 of the cup portion 2 of the outer joint member 1 of the present embodiment is subjected to ironing on the cup-shaped portion 2 ′ of the front raw material 1 ″. Thus, the opening-side end of the cup-shaped portion 2 ′ is a surface obtained by free deformation, and is not a surface finished by finishing such as turning.

  At a predetermined position in the axial direction of the inner diameter surface 4 of the cup part 2, a judgment reference part (first judgment reference part 12) molded simultaneously with the ironing process on the cup-shaped part 2 ′ of the front profile 1 ″ The step 14 is provided continuously (over the entire circumference of the cup 2) in the circumferential direction of the cup 2. Here, the judgment reference part is an ironing This is a part that is used as a reference when determining whether or not the cup depth D is within the tolerance range after the machining is completed. This is because the determination reference part is a part that is used as a reference when determining whether or not the cup depth D exceeds the tolerance lower limit (tolerance lower limit of the required cup depth). As will be described later, on the inner diameter surface 4 of the cup portion 2, as shown in FIG. In some cases-up depth D is the second criterion portion 13 is further molded to be a reference in determining whether it exceeds the tolerance limit (tolerance limit required cup depth).

  In the present embodiment, the axis orthogonal plane indicated by reference numeral x1 in FIG. 1B is the tolerance lower limit of the required cup depth, and the stepped portion as the first determination reference section 12 for displaying the axis orthogonal plane x1 14 is molded in accordance with the axis orthogonal plane x1. In the outer joint member 1, the stepped portion 14 (the whole) as the first determination reference portion 12 exists on the inner diameter surface 4 of the cup portion 2 which is a molding surface by ironing, and the second determination reference portion 13 Step 14 (see FIG. 5B) does not exist on the inner diameter surface 4 of the cup portion 2, it can be determined by visual confirmation that the cup depth D is within the tolerance range. .

  The height difference y1 of the stepped portion 14 serving as the first determination reference portion 12 (further, the second determination reference portion 13 shown in FIG. 5B) is set to 0.01 mm or more and 1.0 mm or less. The reason why the lower limit of the height difference y1 is set to 0.01 mm is to execute the pass / fail determination of the cup depth D accurately and quickly, and the height difference y1 is so small that it is less than 0.01 mm. And the possibility that the pass / fail determination of the cup depth D cannot be performed accurately and quickly increases. The upper limit of the height difference y1 is set to 1.0 mm because if the height difference y1 exceeds 1.0 mm, the mold release property of the cup-shaped part 2 ′ from the molding die used for ironing is adversely affected. This is because there is a possibility that the rolling performance of the roller may be adversely affected.

  Hereinafter, an embodiment of a method for manufacturing an outer joint member according to the present invention, that is, a method for manufacturing the outer joint member 1 described above will be described in detail with reference to FIGS. The outer joint member 1 is a pre-forging step (see FIGS. 2 (a) to (d)) for obtaining a pre-shaped member 1 ″ having a cup-shaped portion 2 ′ (see FIG. 3), a pre-shaped member 1 ″. Each part of the base material 1 ′ obtained through the ironing process (FIG. 4) and the ironing process for forming the inner diameter surface of the cup-shaped part 2 ′ into the final shape (the shape of the inner diameter surface 4 of the cup part 2) Is completed through a finishing process for finishing the material into a final shape, a heat treatment step for heat-treating the shaped material 1 ′ finished in the final shape, and the like.

  The pre-forging process is composed of a plurality of processes. Specifically, first, the solid bar-shaped material (billet) M shown in FIG. 2A is subjected to forward extrusion processing, and as shown in FIG. 2B, one end outer peripheral edge of the bar-shaped material M is rounded. At the same time, the first intermediate molded product M1 in which the central portion at one end of the rod-shaped material M swells is molded. Next, the first intermediate molded product M1 is further subjected to a forward extrusion process, whereby a shaft-shaped portion 3 ′ is formed on the side where the outer peripheral edge is rounded as shown in FIG. 2C. Intermediate product M2 is obtained. Thereafter, upsetting is performed on the second intermediate molded product M2, and as shown in FIG. 2D, the third intermediate molding in which the upsetting portion 2 ″ is formed integrally with the shaft-like portion 3 ′. Product M3 is obtained.

  Next, by performing a backward extrusion process on the upset portion 2 ″ of the third intermediate molded product M3, a front shape member 1 ″ having a cup-shaped portion 2 ′ as shown in FIG. 3 is obtained. The cup-shaped portion 2 ′ of the front element 1 ”has a cross-sectional shape similar to the cup portion 2 of the outer joint member 1 as a finished product. A track groove 5 ′ having a cross-section flower crown shape and having roller guide surfaces 6 ′ and 6 ′ is formed on the inner diameter surface thereof. However, the cup-shaped portion 2 ′ of the front profile 1 ″ is thicker and shorter in the axial direction than the cup portion 2 of the outer joint member 1 as a finished product. Therefore, the track groove 5 ′ (roller The axial dimension of the guide surface 6 ′) is also shorter than the axial dimension of the track groove 5 (roller guide surface 6).

  Next, the pre-shaped material 1 ″ is transferred to the ironing process. In the ironing process, the molding material provided with the ironing punch 20 and the ironing die 30 shown in FIG. The cup-shaped portion 2 ′ is ironed to form (finish) the inner diameter surface of the cup-shaped portion 2 ′ into a final shape (the shape of the inner diameter surface 4 of the cup portion 2).

  A molding die 21 for finishing the inner diameter surface of the cup-shaped portion 2 ′ to a final shape is provided on the outer periphery of the tip portion of the ironing punch 20. First and second determination reference molding portions 22 and 23 are provided at two positions spaced apart in the axial direction of the molding die portion 21. The first determination reference molding part 22 is used when inspecting / determining whether the cup depth D of the cup part 2 (cup-like part 2 ′ after ironing) exceeds the tolerance lower limit of the required cup depth. The first determination reference portion 12 (see FIG. 1B and the like) serving as a reference for the shape is a portion that can be molded on the inner diameter surface of the cup-shaped portion 2 ′. On the other hand, the second criterion forming part 23 is inspected / determined whether or not the cup depth D of the cup part 2 (cup-like part 2 ′ after ironing) exceeds the upper limit tolerance of the required cup depth. The second determination reference portion 13 (see FIG. 5B), which is a reference for the case, is a portion that can be molded on the inner diameter surface of the cup-shaped portion 2 ′. Accordingly, the axial separation distance L1 between the tip surface 20a of the punch 20 and the end 22a of the first determination reference molding portion 22 is equal to the tolerance lower limit value of the cup depth D (required cup depth), and the punch 20 The axial separation distance L2 between the tip surface 20a and the end 23a of the second determination reference molding part 23 is equal to the tolerance upper limit value of the cup depth D (required cup depth).

  The front blank 1 '' is positioned and arranged in the molding die having the above configuration, and the iron punch 20 is inserted into the inner periphery of the cup-shaped portion 2 'of the front blank 1' '. In this state, when the ironing die 30 is moved relative to the ironing punch 20 in the axial direction, the cup-shaped portion 2 ′ is ironed along with the relative movement. As the ironing process proceeds, the cup-shaped portion 2 ′ expands and deforms in the axial direction, and at the same time, the inner diameter surface of the cup-shaped portion 2 ′ plastically deforms following the forming die portion 21 of the ironing punch 20. . When the axial movement of the ironing die 30 with respect to the ironing punch 20 is completed, the inner diameter surface of the cup-shaped portion 2 ′ is finished to the final shape (the shape of the inner diameter surface 4 of the cup portion 2 shown in FIG. 1). The member shape material 1 ′ (indicated by a two-dot chain line in FIG. 4) is obtained.

  After the raw material 1 'is taken out of the molding die, it is inspected whether the cup depth D of the raw material 1' is within the dimensional tolerance. In the present invention, the first and second determination reference portions 12 and 13 are formed by using a molding die (squeezing punch 20) that can be molded at two locations separated in the axial direction of the inner diameter surface of the cup-shaped portion 2 ′. Since the cup-shaped portion 2 ′ of the former raw material 1 ″ is ironed, the cup-shaped portion 2 ′ after the ironing processing (the cup-shaped portion 2 ′ of the raw material 1 ′, more specifically, completed) It is possible to visually check whether the cup depth D of the cup portion 2) of the outer joint member 1 as a product is within the tolerance range, that is, as shown in FIG. First and second determination reference portions are formed on the inner diameter surface of the cup-shaped portion 2 ′ of the raw material 1 ′, which is a molding surface formed by ironing the cup-shaped portion 2 ′ of the raw material 1 ″. If 12 and 13 do not exist at all, it is determined that the cup depth D is a defective product that is below the tolerance lower limit. It is possible. On the other hand, as shown in FIG. 5B, if the first and second determination reference portions 12 and 13 are present on the inner diameter surface of the cup-shaped portion 2 ′ of the shaped member 1 ′, the cup depth D Can be determined to be a defective product exceeding the tolerance upper limit.

  Thus, in the present invention, the determination reference portion for determining whether or not the cup depth D is within the tolerance range is used as the molding surface (the cup portion 2 of the cup portion 2). Using a mold that can be molded on the inner diameter surface 4), the cup-shaped portion 2 'of the front blank 1 "is ironed. In this way, the cup depth D has a tolerance. Whether or not it is within the range is determined based on whether or not there is a determination reference portion (first and second determination reference portions 12 and 13) molded on the inner diameter surface of the cup-shaped portion 2 ′ (cup portion 2). It is possible to make a determination only by visually confirming the formation mode, so that it is not necessary to perform the measurement / inspection processing of the cup depth D using the dedicated measuring instrument 100 as shown in FIG.・ Improving the workability of the inspection process and improving the accuracy of pass / fail judgment . Thus, productivity outer joint member 1 is achieved.

  As described above, the acceptable product determined that the cup depth D is within the dimensional tolerance is paid out to the subsequent process. Then, for example, after forming an annular groove for fixing the boot on the outer diameter surface of the cup-shaped portion 2 ′ of the shaped member 1 ′ and forming a spline or the like on the shaft-shaped portion 3 ′ of the shaped member 1 ′, The outer joint member 1 shown in FIGS. 1A and 1B having the cup portion 2 and the shaft portion 3 integrally is completed.

  The outer joint member 1 and the manufacturing method thereof according to one embodiment of the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. It is possible to make changes.

  For example, the determination reference portion (first and second determination reference portions 12, 13) is a protruding portion 15 having a height y2 of 0.01 mm or more and 1.0 mm or less, as shown in FIG. Alternatively, as shown in FIG. 6B, the depth dimension y3 may be constituted by a concave portion 16 having a depth of 0.01 mm or more and 1.0 mm or less. 6A and 6B, the protruding portion 15 and the recessed portion 16 are formed as the first determination reference portion 12 over the entire circumference of the inner diameter surface 4 of the cup portion 2 of the outer joint member 1. The case is shown as an example.

  Further, as shown in FIG. 7, the determination reference portion (first determination reference portion 12 in the illustrated example) may be provided intermittently in the circumferential direction of the cup portion 2. In particular, as shown in FIG. 7, if the determination reference portion is provided in the circumferential region excluding the formation region of the track groove 5, the reduction in rolling performance of the torque transmitting member (roller) due to the provision of the determination reference portion is taken into consideration Not enough. FIG. 7 shows the case where the concave portion 16 is employed as the determination reference portion (first determination reference portion 12), but also when the stepped portion 14 or the protruding portion 15 is employed as the determination reference portion. Such a configuration can be adopted.

  Further, the outer joint member 1 shown in FIG. 1 has a surface obtained by freely deforming the opening-side end portion of the cup-shaped portion 2 ′ of the front element 1 ″ along the ironing process. Although the opening side end surface 7 is configured, the opening side end surface 7 of the cup portion 2 may be a surface finished by turning as shown in Fig. 8. That is, see Fig. 4. After the ironing process described above, a turning process is further provided as an end removing process for removing a predetermined dimension of the opening end of the cup-shaped part 2 ′ of the shaped member 1 ′. In this turning process, the cup-shaped part The opening end portion of 2 ′ may be turned to an axial position where the entire first determination reference portion 12 (stepped portion 14) is removed.In this case, on the inner diameter surface of the cup-shaped portion 2 ′. The stepped portion 14 as the first determination reference portion 12 formed by molding is a turning end position (capacity). It can be utilized as a mark indicating the formation position of the opening end surface 7 of the flop section 2).

  In the above description, the determination reference portion is molded on the inner diameter surface 4 of the cup portion 2 (the inner diameter surface of the cup-shaped portion 2 ′ of the base material 1 ′). Instead of the inner diameter surface 4 or in addition to the inner diameter surface 4 of the cup portion 2, it may be molded on the outer diameter surface of the cup portion 2 (not shown).

  In the above, the outer joint member 1 for a tripod type constant velocity universal joint (TJ), which is a kind of sliding type constant velocity universal joint, and the case where the present invention is applied when manufacturing the outer joint member 1 are described. However, the present invention can also be applied to the manufacture of other sliding type constant velocity universal joints, such as an outer joint member for a double offset type constant velocity universal joint (DOJ), and this outer joint member. Is possible.

  The present invention is not limited to the outer joint member for the sliding type constant velocity universal joint described above, but also the outer joint member for the fixed type constant velocity universal joint such as an undercut free type constant velocity universal joint (UJ). And when the outer joint member is manufactured. The fixed type constant velocity universal joint does not allow axial displacement but allows only angular displacement, and the track groove of the outer joint member incorporated therein is relatively positioned on the cup opening side. It is comprised by the linear part extended in parallel with a joint axis line, and the circular arc-shaped part located in a cup bottom side relatively. In this case, the linear portion of the track groove can be formed (finished) into a final shape by ironing.

DESCRIPTION OF SYMBOLS 1 Outer joint member 1 'Shape material 1 "Pre-shape material 2 Cup part 2' Cup-shaped part 3 Shaft part 3 'Shaft-shaped part 4 Inner diameter surface (molding surface)
5 Track groove 12 First determination reference part (determination reference part)
13 Second determination reference part (determination reference part)
14 Stepped portion 15 Protruding portion 16 Concave portion 20 Iron punch 21 Mold portion 22 First determination reference forming portion 23 Second determination reference forming portion 30 Ironing die D Cup depth x1 Axis orthogonal plane (of required cup depth) Tolerance lower limit)
y1 Height difference of stepped part y2 Height dimension of projecting part y3 Depth dimension of recessed part

Claims (11)

A molding surface having a cup portion having one end opened and a plurality of track grooves extending in the axial direction on the inner diameter surface, the cup portion being formed by ironing the cup-shaped portion of the former material A method for manufacturing an outer joint member for a constant velocity universal joint, comprising:
An outer joint member for a constant velocity universal joint characterized in that the ironing process is executed using a molding die that can be molded on the molding surface as a judgment reference portion for judging pass / fail of the cup depth. Production method.   2. The outer joint member for a constant velocity universal joint according to claim 1, wherein the molding die is a mold that can mold the determination reference portion at two positions spaced apart in the axial direction of the molding surface. Manufacturing method.   After the ironing process, the method further includes an end portion removing step for removing one end portion of the cup portion by a predetermined dimension. In the end portion removing step, the cup portion reaches an axial position where the entire determination reference portion is removed. The method for manufacturing an outer joint member for a constant velocity universal joint according to claim 1, wherein one end of the outer joint member is removed. A molding surface having a cup portion having one end opened and a plurality of track grooves extending in the axial direction on the inner diameter surface, the cup portion being formed by ironing the cup-shaped portion of the former material An outer joint member for a constant velocity universal joint,
An outer joint member for a constant velocity universal joint, comprising: a judgment reference part for judging whether the cup depth is acceptable or not, wherein the judgment reference part is molded on the molding surface simultaneously with the ironing process.   The outer joint member for a constant velocity universal joint according to claim 4, wherein the determination reference portion is continuously provided in a circumferential direction of the cup portion.   The outer joint member for a constant velocity universal joint according to claim 4, wherein the determination reference portion is provided intermittently in a circumferential direction of the cup portion.   The outer joint member for a constant velocity universal joint according to any one of claims 4 to 6, wherein the determination reference portion is configured by a step portion having a height difference of 0.01 mm to 1.0 mm.   The outer joint member for a constant velocity universal joint according to any one of claims 4 to 6, wherein the determination reference portion is constituted by a protruding portion having a height dimension of 0.01 mm or greater and 1.0 mm or less.   The outer joint member for a constant velocity universal joint according to any one of claims 4 to 6, wherein the determination reference portion is configured by a concave portion having a depth dimension of 0.01 mm or greater and 1.0 mm or less.   The outer joint member for a constant velocity universal joint according to any one of claims 4 to 9, wherein the track groove includes a linear portion extending in parallel with a joint axis.   The track groove is composed of a linear portion that is relatively positioned on one end side of the cup portion and extends parallel to the joint axis, and an arc-shaped portion that is relatively positioned on the other end side of the cup portion. The outer joint member for constant velocity universal joints as described in any one of Claims 4-9.

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