WO2022158159A1 - 転造盤およびこの転造盤で製造されるボールねじの製造方法 - Google Patents
転造盤およびこの転造盤で製造されるボールねじの製造方法 Download PDFInfo
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- WO2022158159A1 WO2022158159A1 PCT/JP2021/045479 JP2021045479W WO2022158159A1 WO 2022158159 A1 WO2022158159 A1 WO 2022158159A1 JP 2021045479 W JP2021045479 W JP 2021045479W WO 2022158159 A1 WO2022158159 A1 WO 2022158159A1
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- 238000005096 rolling process Methods 0.000 title claims abstract description 190
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 8
- 230000002093 peripheral effect Effects 0.000 claims abstract description 93
- 238000003825 pressing Methods 0.000 claims abstract 2
- 230000015572 biosynthetic process Effects 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 abstract 1
- 230000007246 mechanism Effects 0.000 description 7
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/04—Making by means of profiled-rolls or die rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/04—Making machine elements ball-races or sliding bearing races
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
Definitions
- the present invention relates to a rolling machine and a method for manufacturing a ball screw produced by this rolling machine.
- This type of rolling machine various rolling machines such as a round die rolling machine and a planetary rolling machine are provided depending on the type of dies. Rolling machines are known.
- This round die rolling machine is a device that plastically deforms the outer peripheral surface of a cylindrical screw material (blank) to process a male screw or the like.
- a pair of thread rolling dies are inserted into a pair of main shafts, respectively, and these thread rolling dies are attached and fixed to the respective main shafts by means of keys and key grooves.
- the pair of main shafts are synchronously rotated in the same direction by a driving device composed of a driving motor and a speed reducer.
- the pair of rolling dies are rotationally driven in the same direction by the rotation of each main shaft, and a male thread is formed on the outer peripheral surface of the blank to form a screw member.
- the present invention has been devised in view of the technical problems of the prior art, and provides a rolling machine that suppresses the occurrence of sticking of the rolling dies to the spindle and facilitates the removal of the rolling dies.
- One purpose is to provide
- An embodiment of the present invention includes a rolling die that presses the shaft-shaped member while rotating in contact with the outer peripheral surface of the shaft-shaped member, thereby plastically deforming the outer peripheral surface of the shaft-shaped member to form a male thread, and a main shaft that is inserted into a through hole that is formed through in a rotation axis direction and that transmits a rotational force to the rolling die; a regulating portion that regulates relative rotation of the rolling die with respect to the main shaft; and an inner circumference of the through hole. and a linear oil groove provided on the surface or the outer peripheral surface of the main shaft and extending in the inner axial direction from the axial end side of the through hole.
- FIG. 1 is an overall configuration diagram of a round die rolling machine according to an embodiment of the present invention
- FIG. 1 is a front view of a rolling die provided for a first embodiment of the present invention
- FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; BRIEF DESCRIPTION OF THE DRAWINGS
- the rolling die of this embodiment is shown, (a) is a perspective view of a rolling die, (b) is a principal part enlarged view of (a).
- FIG. 2 shows two rolling dies with different formation positions of oil grooves provided for this embodiment, and (a) and (b) are partial cross-sectional views of the rolling dies with different formation positions of the two oil grooves; (c) and (d) are front views of respective rolling dies corresponding to (a) and (b), respectively.
- FIG. 2 shows a rolling die provided for a second embodiment of the rolling machine of the present invention, where (a) is a front view of the rolling die and (b) is a sectional view taken along the line CC of (a).
- FIG. 3 shows a rolling die provided for a third embodiment of the rolling machine of the present invention, where (a) is a front view of the rolling die and (b) is a sectional view taken along the line DD of (a).
- the rolling machine of the present embodiment is a round die rolling machine, and the object to be rolled (shaft-shaped member) is described in, for example, JP-A-2019-189925 and JP-A-2020-026185.
- the object is the steering shaft of the ball screw used in the electric power steering system.
- a ball screw is composed of a nut having a helical female thread groove formed on its inner peripheral surface, and a shaft-like member to which the nut is assembled and having a helical male thread groove formed on its outer peripheral surface opposite to the female thread groove. It has a steering shaft and a circulation ball located between the female and male threads. As the nut rotates, the circulating balls move in the ball moving passage, thereby moving the steering shaft with respect to the nut in the direction of the rotation axis of the nut.
- FIG. 1 is an overall configuration diagram of a round die rolling machine according to an embodiment of the present invention
- FIG. 2 is a front view of a rolling die provided for this embodiment
- FIG. FIG. 4(a) is a perspective view of a rolling die
- (b) is an enlarged view of a main part of (a).
- a round die rolling machine is formed in a bilaterally symmetrical shape as shown in FIG. , 2 and are rotationally driven by a drive mechanism (not shown), and a pair of rolling dies 4, 4 attached to the outer periphery of the main shafts 3, 3. ing.
- the headstocks 2, 2 are moved relative to each other in the left-right and lateral directions (arrow directions) in the figure by a pair of electric motors and reduction gears (not shown) of the moving mechanisms 6, 6 supported by the support frames 5, 5. Relative movement is possible in the direction of separation.
- Each of the headstocks 2, 2 is guided and supported in the left and right lateral directions by four pillars 7, 8 arranged across the upper and lower sides of the support frames 5, 5.
- the moving mechanisms 6, 6 are designed to electrically move the headstocks 2, 2 relative to each other using an electric motor or the like. .
- the spindles 3, 3 are configured to rotate synchronously in the same direction (arrow X direction in the figure) by a drive mechanism consisting of an electric motor and a speed reducer (not shown) provided inside the headstocks 2, 2.
- the spindles 3, 3 are configured to be vertically tilted by tilting mechanisms 9, 9 provided on the headstocks 2, 2.
- the drive mechanism is driven and controlled by so-called CNC control.
- each of the rolling dies 4, 4 is formed in a cylindrical shape from a metal material such as alloy tool steel or high-speed tool steel suitable for rolling.
- Each of the rolling dies 4, 4 has through holes 10, 10 through which the respective main shafts 3, 3 are inserted in the direction of the inner central axis, and threaded teeth 11, 11 for threading are formed on the outer peripheral surface. formed.
- the rolling dies 4, 4 have key grooves 12, 12 which are restricting portions (marking portions) formed linearly in the axial direction on the inner peripheral surfaces 10a, 10a of the through holes 10, 10, and the key grooves 12, 12 , 12 restricts the relative rotation of the main shafts 3,3.
- the rolling dies 4, 4 are rotated counterclockwise like the main shafts 3, 3 as indicated by the arrows in FIG.
- the key grooves 12, 12 and the keys 13, 13 of each rolling die 4 are provided at the same position (reference position) in the circumferential direction of the through holes 10, 10. As shown in FIG.
- the steering shaft 14 which is the object to be rolled, is sandwiched. Form a male thread groove.
- the steering shaft 14 is rotatably mounted on the upper end of a support member 15 provided on the upper surface of the base 1 .
- the support member 15 is formed in a plate-like shape, is arranged below between the rolling dies 4 and 4, and has its lower end fixed on the base 1. As shown in FIG.
- Oil grooves 16, 16 are formed in the inner peripheral surfaces 10a, 10a of the through holes 10, 10 of the rolling dies 4, 4 as shown in FIGS. there is
- the oil groove 16 of one rolling die 4 will be described below as an example.
- the oil groove 16 is spirally formed on the entire inner peripheral surface 10a of the through-hole 10, one end 16a in the axial direction is formed to be open on the one side surface 4a of the rolling die 4, and the other end 16b is An opening is formed on the other side surface 4 b of the rolling die 4 .
- the oil groove 16 has a helical width W set to a predetermined distance, and one end 16a that is open on one side surface 4a is formed in a semicircular arc shape that is long in the circumferential direction as shown in FIGS. 4(a) and 4(b). .
- the other end portion 16b which is open to the other side surface 4b, is also formed in a semicircular shape elongated in the circumferential direction.
- a spiral oil groove 16 is also formed in the inner peripheral surface 10 a of the through hole 10 of the other rolling die 4 .
- the oil groove 16 of the other rolling die 4 has the same helical width W as that of the oil groove 16 on one side, but differs in the turning formation position (circumferential position) with respect to the inner peripheral surface 10a. Accordingly, in the oil groove 16 on the other side, the forming positions of the semicircular one end portion 16a and the other end portion 16b in the circumferential direction are different from the forming positions of the oil groove 16 on the one side.
- oil grooves 16 of the respective rolling dies 4 are formed at different positions in the circumferential direction with the key groove 12 and the key 13 as a reference.
- the oil grooves 16, 16 are filled with oil from one of the ends 16a, 16b. Oil is to be injected, for example manually.
- 5(a) and 5(b) are partial cross-sectional views of a rolling die in which the plurality of oil grooves 16 are formed at different positions. It is a front view of a manufacturing die.
- Each rolling die 4 is replaced with another one when the threading teeth 11 wear out due to long-time rolling work, and a plurality of new rolling dies 4 to be replaced are prepared in advance.
- 5(a) and 5(b) the spiral oil grooves 16 formed on the inner peripheral surface 10a of the through-hole 10 are different from each other.
- a plurality of oil grooves 16 are provided, and the turning forming positions of the respective oil grooves 16 are slightly shifted in the axial direction.
- the oil groove 16 of one rolling die 4 has an opening position of one end 16a positioned at the upper end of the through hole 10 as shown in FIG. 5(c).
- the oil groove 16 of the other rolling die 4 as shown in FIG. It is located on the side about 45 degrees to the right.
- the oil grooves 16 of the plurality of other rolling dies 4 are also different from each other, for example, the forming position is shifted in the axial direction or the length of the helical width W is different.
- the method of rolling the male thread groove on the outer peripheral surface of the steering shaft 14 by the round die rolling machine of the present embodiment is performed by a general method based on CNC control, so a specific description will be omitted.
- the oil injected into the oil groove 16 forms an oil film between the outer peripheral surface of the spindle 3 and the inner peripheral surface 10a of the through hole 10 of the rolling die 4.
- the occurrence of sticking between the main shaft 3 and the rolling die 4 due to high heat can be sufficiently suppressed.
- the efficiency of the replacement work at the time of replacement of the rolling die 4 is improved, and since there is no need to forcibly remove the rolling die 4 by hitting it with a hammer or the like, distortion of the main shaft 3, equipment, etc., does not occur, thereby improving the rolling accuracy. Decrease can be suppressed.
- the oil groove 16 is formed in a spiral or linear shape with a small width, so that the inner peripheral surface 16a of the through hole 10 and the outer peripheral surface of the main shaft 3 A sufficient contact area can be secured between them. Therefore, it is possible to suppress the occurrence of wear of the main shaft 3 that receives the withstand load.
- the formation positions of the oil grooves 16 in the axial direction are changed for each of the plurality of rolling dies 4, so that the formation positions of the oil grooves 16 differ when the rolling dies 4 are replaced. can be exchanged.
- the outer peripheral surface of the main shaft 3 can be prevented from being locally worn due to sliding against the inner peripheral surface 10a of the replaced through hole 10, thereby improving the durability.
- oil can be manually injected into the oil groove 16 from the openings of the one end 16a or the other end 16b, which reduces costs.
- the injection since the injection is performed manually using an injector, the cost can be reduced compared to automatic injection using equipment.
- the one end portion 16a and the other end portion 16b of the oil groove 16 are formed in a semicircular arc shape, and the overall opening area is sufficiently larger than the linear cross-sectional area. Therefore, it is possible to easily inject oil into the oil groove 16 from one end 16a or the other end 16b using an injector, and to inject a large amount of oil in one injection.
- the oil groove 16 is spirally formed on the inner peripheral surface 10a of the through hole 10, it is easy to form an oil film on the entire inner peripheral surface 10a of the through hole 10 and the outer peripheral surface of the main spindle 3. Molding using a tool or the like is facilitated, and since the overall length in the axial direction can be lengthened, oil retention is improved.
- FIG. 6 shows a rolling die provided for the second embodiment of the rolling machine of the present invention, (a) is a front view of the rolling die, and (b) is a sectional view taken along line CC of (a). be.
- each rolling die 4 has an oil groove 16 which is linearly formed in the inner peripheral surface 10a of the through hole 10 from one end to the other end in the axial direction.
- the oil groove 16 has a substantially semicircular cross-sectional shape perpendicular to the axis of the through-hole 10 , and has one end portion 16 a open on both side surfaces of the rolling die 4 and the other end portion 16 a. It is formed in an elongated linear shape along the axial direction of the through hole 10 to the end 16b.
- first to third annular grooves 17a, 17b, 17c communicating with the oil groove 16 are provided at three locations in the axial direction of the inner peripheral surface 10a of the through hole 10.
- These annular grooves are composed of a first annular groove 17a provided substantially in the center of the through hole 10 in the axial direction, and second and third annular grooves arranged on both sides of the first annular groove 17a with a constant span. It is composed of grooves 17b and 17c.
- the annular grooves 17a to 17c communicate with each other in such a manner that the oil groove 16 traverses the respective upper ends in FIG. Accordingly, the oil injected from one end 16a or the other end 16b of the oil groove 16 is filled from the oil groove 16 into the annular grooves 17a to 17c.
- the oil injected into the oil groove 16 is functions as an oil reservoir. Therefore, the oil film forming action between the inner peripheral surface 10a of the through hole 10 and the outer peripheral surface of the main shaft 3 is improved, and the effect of suppressing the sticking of the rolling dies 4 to the main shaft 3 after long-time driving is further improved. .
- FIG. 7 shows a rolling die provided for the third embodiment of the rolling machine of the present invention, (a) is a front view of the rolling die, and (b) is a cross-sectional view taken along line DD of (a). be.
- each rolling die 4 has a plurality of oil grooves 16 (10 in this embodiment) formed in the inner peripheral surface 10a of the through hole 10 along the axial direction. It is The ten oil grooves 16 are arranged at equal intervals of about 36° in the circumferential direction, and have a substantially semicircular cross-sectional shape perpendicular to the axis of the through hole 10. is formed in Each oil groove 16 is formed in an elongated linear shape along the axial direction of the through-hole 10 from one end 16a opened on both side surfaces of the rolling die 4 to the other end 16b.
- the oil can be stored well, and the oil can be stored between the main shaft 3 and the rolling die 4 . A sufficient oil film can be formed.
- the number of oil grooves 16 is 10 in this embodiment, the number may be 10 or less or more.
- an oil groove 16 is formed in the inner peripheral surface 10a of the through hole 10 so as to be inclined at a predetermined angle in the axial direction with respect to the rotation axis of the rolling die 4. did.
- the oil groove 16 is not helical or linear, but is inclined at a predetermined angle from one end 16a to the other end 16b.
- the oil groove 16 is formed in a swivel-inclined shape at a predetermined angle along the axial direction with respect to the through-hole 10 for less than one turn.
- the opening area of each of the one end portion 16a and the other end portion 16b can be increased compared to the case where the opening area of each of the one end portion 16a and the other end portion 16b is formed in a straight line. It becomes easier to inject oil into the
- the present invention is not limited to the configuration of the above embodiment, and can be applied to a rolling machine other than a round die rolling machine as a rolling machine.
- the object to be rolled which is the object to be rolled, is not limited to a ball screw, and includes a general shaft-shaped member having a male thread formed on its outer circumference.
- At least one of the one end portion 16a and the other end portion 16b of the oil groove 16 can be configured to open to the outside.
- a rolling die that presses the shaft-shaped member while rotating in contact with the outer peripheral surface of the shaft-shaped member to plastically deform the outer peripheral surface to form a male thread, and rotation of the rolling die.
- a main shaft that is inserted into a through hole formed through the axial direction to transmit a rotational force to the rolling die, a restricting portion that restricts relative rotation of the rolling die with respect to the main shaft, and an inner peripheral surface of the through hole.
- it has a linear oil groove provided on the outer peripheral surface of the main shaft and extending in the inner axial direction from the axial end side of the through hole.
- the oil supplied into the oil groove forms an oil film between the outer peripheral surface of the spindle and the inner peripheral surface of the through hole of the rolling die.
- the main shaft and rolling dies do not stick together due to the high processing heat generated during the drive of the platen. Therefore, the rolling die can be easily removed from the main shaft, and the efficiency of the replacement work can be improved.
- the oil groove is formed on the inner peripheral surface of the through-hole of the rolling die.
- the oil grooves on the inner peripheral surface of the through holes of the rolling dies it is possible to change the formation positions of the oil grooves for each of the plurality of rolling dies. That is, by making the forming positions of the oil grooves different from each other, it is possible to replace the rolling dies with those having different forming positions of the oil grooves when replacing the rolling dies. As a result, the outer peripheral surface of the main shaft can be prevented from being locally worn due to sliding against the inner peripheral surface of the replaced through hole, thereby improving the durability.
- one axial end of the through hole is open to the outside, and the other axial end is also open to the outside.
- oil when the rolling machine is stopped, oil can be injected into the oil groove through each opening at one end or the other end, which facilitates the injection work.
- the oil groove is formed on the inner peripheral surface of the through hole so as to be axially inclined with respect to the rotation axis of the rolling die.
- the oil groove in the axial direction along the axial direction at a predetermined angle in a swivel-inclined shape with less than one turn.
- the oil grooves in an inclined shape in this way, it is possible to form a uniform oil film over the entire inner peripheral surface of the through-hole and the outer peripheral surface of the spindle. Since the area can be increased as compared with the case where the groove is formed linearly, it becomes easier to inject oil into the oil groove.
- the oil groove is spirally formed on the inner peripheral surface of the through hole.
- the oil groove is formed in a spiral shape, the oil film can be uniformly formed over the entire inner peripheral surface of the through hole and the outer peripheral surface of the main shaft, and the oil groove is relatively formed. easy to do.
- the opening area of the one end opening and the other end opening can be made large, oil can be easily injected, and the length of the entire oil groove can be increased by forming it in a spiral shape, so that the oil storage property is improved. .
- the oil groove has an opening at one end and an opening at the other end extending in the circumferential direction.
- the openings of the one end and the other end extend in the circumferential direction, the opening area is increased. Therefore, it becomes easy to inject oil from each opening, and the workability is improved.
- the oil groove is provided linearly in the axial direction on the inner peripheral surface of the through hole, and one or two or more annular oil grooves communicate with the oil groove in the peripheral direction of the inner peripheral surface of the through hole.
- a groove is formed.
- each of the annular grooves can absorb the oil sent from the oil groove. functions as a reservoir. Therefore, the effect of forming an oil film between the inner peripheral surface of the through-hole and the outer peripheral surface of the spindle is increased, and the effect of suppressing sticking of the rolling die to the spindle is further improved.
- a plurality of the oil grooves are provided in the inner peripheral surface of the through hole along the axial direction.
- the oil groove is formed on the outer peripheral surface of the main shaft corresponding to the through hole.
- a ball screw manufacturing method using the rolling machine according to claim 1, comprising:
- the ball screw comprises a nut having a female thread formed on its inner peripheral surface, a metal shaft-shaped member to which the nut is assembled and having a male thread formed on its outer peripheral surface opposite to the female thread, and the female thread and the male thread. a plurality of balls positioned therebetween;
- the rolling die rotated by the rotational force transmitted from the main shaft is brought into contact with the outer peripheral surface of the shaft-shaped member, and the shaft-shaped member is pressed to plastically deform the outer peripheral surface to form the male screw. configured to form
- the replaced rolling dies are arranged so that the circumferential formation positions of the oil grooves of the rolling dies before replacement are the circumferential formation positions of the oil grooves of the rolling dies before replacement. It is designed to use something different from
- the dies having different formation positions of the oil grooves are used, so that the occurrence of local wear on the outer peripheral surface of the main shaft can be suppressed compared to dies having the same formation positions.
- the plurality of rolling dies for replacement are formed with a mark portion at the same position in the circumferential direction, and the oil groove is formed at a position different in the circumferential direction from the mark portion. .
- the mark portion is a key groove formed axially inward from the rim of the through hole, and the rolling die is formed by inserting and fixing a key into the key groove from the axial direction. Rotation relative to the main shaft is restricted.
- the ball screw is used in a power steering device that transmits the rotational force of an electric motor to the nut to axially move the shaft-shaped member to apply steering force.
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Abstract
Description
〔第2実施形態〕
図6は本発明の転造盤の第2実施形態に供される転造ダイスを示し、(a)は転造ダイスの正面図、(b)は(a)のC-C線断面図である。
図7は本発明の転造盤の第3実施形態に供される転造ダイスを示し、(a)は転造ダイスの正面図、(b)は(a)のD-D線断面図である。
本発明の第4実施形態としては、具体的に図示しないが、油溝16を貫通孔10の内周面10aに転造ダイス4の回転軸に対して軸方向へ所定角度で傾斜状に形成した。つまり、前記実施形態の油溝16のように螺旋状や直線状ではなく、一端部16aと他端部16bまでを所定角度の傾斜状に形成したものである。
前記ボールねじは、内周面に雌ねじが形成されたナットと、前記ナットが組み付けられ、外周面に前記雌ねじに対向する雄ねじが形成された金属製の軸状部材と、前記雌ねじと雄ねじとの間に配置された複数のボールと、を有し、
前記主軸から伝達された回転力によって回転した前記転造ダイスを、前記軸状部材の外周面に当接させて、前記軸状部材を押圧することで前記外周面を塑性変形させて前記雄ねじを形成するように構成されている。
Claims (14)
- 軸状部材の外周面に当接回転しながら前記軸状部材を押圧することで前記外周面を塑性変形させて雄ねじを形成する転造ダイスと、
前記転造ダイスの回転軸線方向に貫通形成された貫通孔に挿入され、前記転造ダイスに回転力を伝達する主軸と、
前記主軸に対する前記転造ダイスの相対回転を規制する規制部と、
前記貫通孔の内周面または主軸の外周面に設けられて、前記貫通孔の軸方向の端部側から内部軸方向に延びる線状の油溝と、
を有することを特徴とする転造盤。 - 請求項1に記載の転造盤であって、
前記油溝は、前記転造ダイスの貫通孔の内周面に形成されていることを特徴とする転造盤。 - 請求項1に記載の転造盤であって、
前記油溝は、前記貫通孔の軸方向の一端部が外部に開口していると共に、軸方向の他端部も外部に開口していることを特徴とする転造盤。 - 請求項3に記載の転造盤であって、
前記油溝は、前記貫通孔の内周面に転造ダイスの回転軸に対して軸方向へ傾斜状に形成されていることを特徴とする転造盤。 - 請求項4に記載の転造盤であって、
前記油溝は、前記貫通孔の内周面に螺旋状に形成されていることを特徴とする転造盤。 - 請求項3に記載の転造盤であって、
前記油溝は、一端部の開口と他端部の開口が周方向に延びていることを特徴とする転造盤。 - 請求項2に記載の転造盤であって、
前記油溝は、前記貫通孔の内周面に軸方向へ直線状に設けられ、
前記貫通孔の内周面の周方向に、前記油溝と連通する1又は2以上の環状溝が形成されていることを特徴とする転造盤。 - 請求項2に記載の転造盤であって、
前記油溝は、前記貫通孔の内周面に軸方向へ沿って複数設けられていることを特徴とする転造盤。 - 請求項1に記載の転造盤であって、
前記油溝は、前記主軸の前記貫通孔に対応する外周面に形成されていることを特徴とする転造盤。 - 請求項1に記載の転造盤を用いたボールねじの製造方法であって、
前記ボールねじは、内周面に雌ねじが形成されたナットと、前記ナットが組み付けられ、外周面に前記雌ねじに対向する雄ねじが形成された金属製の軸状部材と、前記雌ねじと雄ねじとの間に配置された複数のボールと、を有し、
前記主軸から伝達された回転力によって回転した前記転造ダイスを、前記軸状部材の外周面に当接させて、前記軸状部材を押圧することで前記外周面を塑性変形させて前記雄ねじを形成することを特徴とする転造盤を用いたボールねじの製造方法。 - 請求項10に記載の転造盤を用いたボールねじの製造方法であって、
前記転造ダイスを交換する際において、交換された後の転造ダイスは、前記油溝の周方向の形成位置が交換前の転造ダイスの前記油溝の周方向の形成位置とは異なっているものを用いることを特徴とする転造盤を用いたボールねじの製造方法。 - 請求項11に記載の転造盤を用いたボールねじの製造方法であって、
交換のための複数の前記転造ダイスは、周方向の同じ位置に目印部が形成され、
前記油溝は、前記目印部とは周方向の位置で異なる位置に形成されていることを特徴とする転造盤を用いたボールねじの製造方法。 - 請求項12に記載の転造盤を用いたボールねじの製造方法であって、
前記目印部は、前記貫通孔の孔縁から内部軸方向に形成されたキー溝であって、前記キー溝にキーが軸方向から挿入固定されることによって前記転造ダイスの前記主軸に対する相対回転を規制することを特徴とする転造盤を用いたボールねじの製造方法。 - 請求項10に記載の転造盤を用いたボールねじの製造方法であって、
前記ボールねじは、電動モータの回転力を前記ナットに伝達することによって前記軸状部材を軸方向に移動させて転舵力を付与するパワーステアリング装置に用いられることを特徴とする転造盤を用いたボールねじの製造方法。
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JPS5212642U (ja) * | 1975-07-17 | 1977-01-28 | ||
JPS57193257A (en) * | 1981-05-21 | 1982-11-27 | Kowa:Kk | Embossing machine |
JP2003062634A (ja) * | 2001-08-23 | 2003-03-05 | Nsk Ltd | ねじ転造方法及びねじ転造装置 |
JP2018176172A (ja) * | 2017-04-04 | 2018-11-15 | 日立金属株式会社 | リング圧延用主ロールの冷却方法及びリング圧延体の製造方法 |
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JPS5212642U (ja) * | 1975-07-17 | 1977-01-28 | ||
JPS57193257A (en) * | 1981-05-21 | 1982-11-27 | Kowa:Kk | Embossing machine |
JP2003062634A (ja) * | 2001-08-23 | 2003-03-05 | Nsk Ltd | ねじ転造方法及びねじ転造装置 |
JP2018176172A (ja) * | 2017-04-04 | 2018-11-15 | 日立金属株式会社 | リング圧延用主ロールの冷却方法及びリング圧延体の製造方法 |
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