JP2016172270A - Rolling flat die, rolling device and rolling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling flat die capable of suppressing generation of a flaw on a thread during rolling processing, while suppressing cost increase, and to provide a rolling device and a rolling method.SOLUTION: A rolling flat die 10 in an embodiment includes a smoothing surface 14 and a rolling surface 16. The smoothing surface 14 is pressed onto the roughly-cut outer peripheral surface of a round bar member which is an object to be rolled, to thereby smooth the outer peripheral surface. The rolling surface 16 is formed beside the smoothing surface 14 in the length direction of the rolling flat die 10, and pressed onto the outer peripheral surface of the round bar member smoothed by the smoothing surface 14, to thereby form a thread on the outer peripheral surface of the round bar member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling flat die, a rolling device, and a rolling method.

  2. Description of the Related Art Conventionally, there is known a rolling device that includes a pair of rolling flat dies and forms a screw thread on the outer peripheral surface of a round bar member that is a material to be rolled by the pair of rolling flat dies (for example, Patent Document 1 reference). In this rolling apparatus, one of the pair of rolling flat dies is moved relative to the other while the rolling surface formed on the pair of rolling flat dies is pressed against the outer peripheral surface of the round bar member. The thread is formed on the outer peripheral surface of the round bar member while the round bar member is rotated.

Japanese Patent No. 3739692

  By the way, when a round bar member is rolled by the above rolling apparatus, the outer peripheral surface of the round bar member may be roughened before the rolling process. However, when the outer peripheral surface of the round bar member is roughened, streak-like processed marks (unevenness) are formed on the outer peripheral surface. When the round bar member is rolled with the streak-like processing marks formed on the outer peripheral surface, the thread may be damaged. This scratch may cause cracks or chips due to aging.

  Therefore, in order to suppress the occurrence of streak-like machining marks on the outer peripheral surface, in order to reduce the feed rate when roughing the outer peripheral surface of the round bar member, or to eliminate streak-like processing marks generated by roughing. It is conceivable that the outer peripheral surface of the round bar member after roughing is smoothed in a separate step before the rolling process. However, in these cases, the processing time becomes long, which increases the cost.

  The present invention has been made in view of the above-mentioned problems, and is capable of suppressing the occurrence of scratches on a thread during rolling processing, while suppressing an increase in cost, and a rolling device, and An object is to provide a rolling method.

  In order to solve the above-mentioned problem, the rolling flat die according to claim 1 is pressed against a rough-cut outer peripheral surface of a round bar member that is a rolled product, and a smoothed surface that smoothes the outer peripheral surface. A rolling surface that is formed side by side with the smoothing surface in the tangential direction of the round bar member, is pressed against the outer peripheral surface smoothed by the smoothing surface, and forms a thread on the outer peripheral surface. .

  According to this rolling flat die, the smoothed surface is formed in addition to the rolled surface. And before the rolling process by a rolling surface, the outer peripheral surface of a round bar member is smoothed by the smoothing surface. Therefore, even when the outer peripheral surface of the round bar member is roughened before the rolling process, and a streak-like processing mark (unevenness) is formed on the outer peripheral surface, the outer peripheral surface of the round bar member is formed by the smoothing surface. By smoothing, this processing trace can be eliminated or miniaturized. Thereby, even when the outer peripheral surface of the round bar member is rolled after rough cutting, it is possible to prevent the thread from being damaged.

  Moreover, since the smoothed surface is formed on the rolled flat die together with the rolled surface, in the same processing step using this rolled flat die, the smoothing process using the smoothed surface and the rolling surface using the rolled surface are performed. The manufacturing process is performed continuously. Thereby, for example, compared with the case where the feed rate when roughing the outer peripheral surface of the round bar member is slowed or the outer peripheral surface of the round bar member after roughing is smoothed in a separate process before rolling. The processing time can be shortened. As a result, even when the outer peripheral surface is smoothed before the thread is formed on the outer peripheral surface of the round bar member, an increase in cost can be suppressed.

  A rolling flat die according to a second aspect of the present invention is the rolling flat die according to the first aspect, in which a roughened slip preventing surface is formed on the smoothed surface.

  According to this rolling flat die, the smoothing surface is formed with a rough slip-preventing surface. Therefore, when the outer peripheral surface of the round bar member is smoothed by the smoothing surface, the slip between the outer peripheral surface of the round bar member and the smoothing surface can be suppressed by the slip suppression surface. Thereby, since a round bar member can be rotated exactly by a smoothing surface, the outer peripheral surface of a round bar member can be smoothed more effectively by this smoothing surface.

  A rolling flat die according to a third aspect is the rolling flat die according to the second aspect, wherein the slip suppression surface is formed on an end side in the width direction of the smoothing surface.

  According to this rolling flat die, the slip suppression surface is formed on the end side in the width direction of the smoothing surface. Therefore, since this slip suppression surface is positioned at the end side of the thread formation region on the outer peripheral surface of the round bar member, the slip suppression surface formed by this rough surface is prevented from affecting the quality of the thread. be able to. Thereby, the quality of a thread can be ensured.

  The rolled flat die according to claim 4 is the rolled flat die according to any one of claims 1 to 3, wherein the smoothed portion is formed with the smoothed surface, and the rolled surface. The smoothing part and the rolling part are separated from each other.

  According to this rolling flat die, the smoothing part in which the smoothing surface is formed and the rolling part in which the rolling surface is formed are separated from each other. Therefore, since the rolled surface and the smoothed surface can be maintained separately (for example, re-polishing), it is possible to improve the quality of the thread after processing while suppressing an increase in cost.

  Moreover, in order to solve the said subject, the rolling apparatus of Claim 5 makes the tangent direction of the round bar member which is a to-be-rolled product the length direction, and is centering on the rotation center axis | shaft of the said round bar member A pair of rolling flat dies arranged symmetrically to each other, and one of the pair of rolling flat dies, one of the rolling flat dies in the length direction one side as the front side, the one rolling flat die, A drive unit that moves from one side to the other in the length direction of the other rolling flat die of the pair of rolling flat dies, each of the pair of rolling flat dies A smoothing surface that is formed on one side in the length direction and is pressed against a rough-cut outer peripheral surface of the round bar member to smooth the outer peripheral surface, and the smoothness in the length direction of the rolling flat die Formed on the other side of the smoothing surface and smoothed by the smoothing surface It is pressed against the outer peripheral surface, and a rolling surface forming a screw thread on the outer peripheral surface.

  According to this rolling device, a smoothing surface is formed on the rolling flat die in addition to the rolling surface. And before the rolling process by a rolling surface, the outer peripheral surface of a round bar member is smoothed by the smoothing surface. Therefore, even when the outer peripheral surface of the round bar member is roughened before the rolling process, and a streak-like processing mark (unevenness) is formed on the outer peripheral surface, the outer peripheral surface of the round bar member is formed by the smoothing surface. By smoothing, this processing trace can be eliminated or miniaturized. Thereby, even when the outer peripheral surface of the round bar member is rolled after rough cutting, it is possible to prevent the thread from being damaged.

  Moreover, since the smoothed surface is formed on the rolled flat die together with the rolled surface, in the same processing step using this rolled flat die, the smoothing process using the smoothed surface and the rolling surface using the rolled surface are performed. The manufacturing process is performed continuously. Thereby, for example, compared with the case where the feed rate when roughing the outer peripheral surface of the round bar member is slowed or the outer peripheral surface of the round bar member after roughing is smoothed in a separate process before rolling. The processing time can be shortened. As a result, even when the outer peripheral surface is smoothed before the thread is formed on the outer peripheral surface of the round bar member, an increase in cost can be suppressed.

  A rolling device according to a sixth aspect is the rolling device according to the fifth aspect, wherein a slip suppression surface that is a rough surface is formed on the smoothed surface.

  According to this rolling apparatus, the smoothing surface of the rolling flat die is formed with a rough slip-preventing surface. Therefore, when the outer peripheral surface of the round bar member is smoothed by the smoothing surface, the slip between the outer peripheral surface of the round bar member and the smoothing surface can be suppressed by the slip suppression surface. Thereby, since a round bar member can be rotated exactly by a smoothing surface, the outer peripheral surface of a round bar member can be smoothed more effectively by this smoothing surface.

  A rolling device according to a seventh aspect is the rolling device according to the sixth aspect, wherein the slip suppression surface is formed on a lateral width direction end side of the smoothing surface.

  According to this rolling apparatus, the slip suppression surface of the rolling flat die is formed on the lateral width direction end side of the smoothing surface. Therefore, since this slip suppression surface is positioned at the end side of the thread formation region on the outer peripheral surface of the round bar member, the slip suppression surface formed by this rough surface is prevented from affecting the quality of the thread. be able to. Thereby, the quality of a thread can be ensured.

  The rolling device according to claim 8 is the rolling device according to any one of claims 5 to 7, wherein each of the pair of rolling flat dies has the smoothed surface formed thereon. A smoothing portion and a rolling portion on which the rolling surface is formed are provided, and the smoothing portion and the rolling portion are separated from each other.

  According to this rolling apparatus, in the rolling flat die, the smoothing portion where the smoothed surface is formed and the rolled portion where the rolled surface is formed are separated from each other. Therefore, since the rolled surface and the smoothed surface can be maintained separately (for example, re-polishing), it is possible to improve the quality of the thread after processing while suppressing an increase in cost.

  Moreover, in order to solve the said subject, the rolling method of Claim 9 is the smoothing surface formed in a pair of rolling flat die | dye in the rough-cut outer peripheral surface in the round bar member which is a to-be-rolled thing. A smoothing step of smoothing the outer peripheral surface with the smoothing surface while rotating the round bar member by moving one of the pair of rolled flat dies with respect to the other while pressing By moving one of the pair of rolling flat dies with respect to the other in a state where the rolling surface formed on the pair of rolling flat dies is pressed against the outer peripheral surface smoothed by the smoothing step, A rolling step of forming threads on the outer peripheral surface by the rolling surface while rotating the round bar member.

  According to this rolling method, a rolled flat die in which a smoothed surface is formed in addition to the rolled surface is used. And before the rolling process by a rolling surface, the outer peripheral surface of a round bar member is smoothed by the smoothing surface. Therefore, even when the outer peripheral surface of the round bar member is roughened before the rolling process, and a streak-like processing mark (unevenness) is formed on the outer peripheral surface, the outer peripheral surface of the round bar member is formed by the smoothing surface. By smoothing, this processing trace can be eliminated or miniaturized. Thereby, even when the outer peripheral surface of the round bar member is rolled after rough cutting, it is possible to prevent the thread from being damaged.

  Moreover, since the smoothed surface is formed on the rolled flat die together with the rolled surface, in the same processing step using this rolled flat die, the smoothing process using the smoothed surface and the rolling surface using the rolled surface are performed. The manufacturing process is performed continuously. Thereby, for example, compared with the case where the feed rate when roughing the outer peripheral surface of the round bar member is slowed or the outer peripheral surface of the round bar member after roughing is smoothed in a separate process before rolling. The processing time can be shortened. As a result, even when the outer peripheral surface is smoothed before the thread is formed on the outer peripheral surface of the round bar member, an increase in cost can be suppressed.

  A rolling method according to a tenth aspect is the rolling method according to the ninth aspect, wherein the rolling flat die has a roughened slip suppressing surface formed on the smoothed surface. This is a method using a die.

  According to this rolling method, the smoothing surface of the rolling flat die is formed with a rough slip-preventing surface. Therefore, when the outer peripheral surface of the round bar member is smoothed by the smoothing surface, the slip between the outer peripheral surface of the round bar member and the smoothing surface can be suppressed by the slip suppression surface. Thereby, since a round bar member can be rotated exactly by a smoothing surface, the outer peripheral surface of a round bar member can be smoothed more effectively by this smoothing surface.

  A rolling method according to an eleventh aspect of the present invention is the rolling method according to the tenth aspect, wherein the slip-preventing surface is formed on the widthwise end side of the smoothing surface as the rolling flat die. This is a method using a die.

  According to this rolling method, the slip suppression surface of the rolled flat die is formed on the lateral width direction end side of the smoothed surface. Therefore, since this slip suppression surface is positioned at the end side of the thread formation region on the outer peripheral surface of the round bar member, the slip suppression surface formed by this rough surface is prevented from affecting the quality of the thread. be able to. Thereby, the quality of a thread can be ensured.

  A rolling method according to a twelfth aspect is the rolling method according to any one of the ninth to eleventh aspects, wherein the smoothing surface is formed with the smoothing surface as the rolling flat die. The method uses a rolling flat die in which the rolling part on which the rolling surface is formed is separated.

  According to this rolling method, in the rolling flat dies, the smoothed portion where the smoothed surface is formed and the rolled portion where the rolled surface is formed are separated from each other. Therefore, since the rolled surface and the smoothed surface can be maintained separately (for example, re-polishing), it is possible to improve the quality of the thread after processing while suppressing an increase in cost.

It is a perspective view of the rolling flat die concerning this embodiment. FIG. 2 is a two-side view (plan view, side view) of the rolled flat die shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line F3-F3 of FIG. FIG. 4 is a cross-sectional view taken along line F4-F4 of FIG. It is the 1st explanatory view explaining the rolling method using the rolling device concerning this embodiment. It is the 2nd explanatory view explaining the rolling method using the rolling device concerning this embodiment. It is a figure which shows the round bar member by which the outer peripheral surface was smooth | blunted by the smoothing surface formed in the rolling flat die | dye of this embodiment. It is a figure which shows the round bar member by which the thread was formed in the outer peripheral surface by the rolling surface formed in the rolling flat die | dye of this embodiment. It is a double view which shows the 1st modification of the rolling flat die | dye which concerns on this embodiment. It is a double view which shows the 2nd modification of the rolling flat die which concerns on this embodiment. It is a figure which shows the round bar member by which the outer peripheral surface was rough-cut. It is a figure which shows the round bar member which was rolled after rough cutting and the screw thread was damaged.

  Hereinafter, an embodiment of the present invention will be described.

  First, a rolled flat die according to an embodiment of the present invention will be described.

  As shown in FIGS. 1 and 2, the rolling flat die 10 according to the present embodiment is for rolling a thread on the outer peripheral surface of a round bar member that is a rolled product. The tangential direction is formed in a long shape with the length direction. A processed surface 12 is formed on the upper surface of the rolled flat die 10. The processed surface 12 is formed by the smoothed surface 14 and the rolled surface 16.

  The smoothing surface 14 is formed on one side in the length direction of the rolled flat die 10 (arrow A side). The smoothing surface 14 is for smoothing the outer peripheral surface of the round bar member before rolling, and is pressed against the outer peripheral surface of the round bar member. In this embodiment, the smoothing surface 14 is formed as a mirror surface as an example (see also FIG. 3). The length of the smoothing surface 14 along the length direction of the rolled flat die 10 is equal to or longer than one round of the outer peripheral surface of the round bar member.

  The rolling surface 16 is formed side by side with the smoothing surface 14 in the length direction of the rolling flat die 10, and more specifically, the other of the smoothing surface 14 in the length direction of the rolling flat die 10. It is formed on the side (arrow B side). The rolling surface 16 is for rolling a thread on the outer peripheral surface of the round bar member, and has a plurality of blades 18 corresponding to the thread (see FIG. 4). The length of the rolling surface 16 along the length direction of the rolling flat die 10 is equal to or longer than one round of the outer peripheral surface of the round bar member. In the present embodiment, as an example, the length of the rolling surface 16 along the length direction of the rolling flat die 10 is longer than the length of the smoothing surface 14 along the length direction of the rolling flat die 10. It has become.

  The rolling flat die 10 is divided into a smoothing portion 24 in which the smoothing surface 14 is formed and a rolling portion 26 in which the rolling surface 16 is formed. The smoothing portion 24 and the rolling portion 26 are divided. Are separated from each other. More specifically, the smoothing portion 24 is formed in a block shape, and is fitted into an L-shaped cutout portion 28 formed on one side in the length direction of the rolled flat die 10 (rolled portion 26). Is fixed.

  Next, a rolling device according to an embodiment of the present invention will be described.

  As shown in FIG. 5, the rolling device 30 according to the present embodiment includes a pair of rolling flat dies 10 </ b> A and 10 </ b> B, a pair of fixing portions 32 </ b> A and 32 </ b> B, and a drive portion 34. The pair of fixing portions 32A and 32B are disposed to face each other. As an example, one fixed portion 32A is fixed, and the other fixed portion 32B is movable.

  The pair of rolled flat dies 10A and 10B are fixed to the facing surfaces 36 of the pair of fixing portions 32A and 32B, respectively. For the pair of rolled flat dies 10A and 10B, the rolled flat die 10 (see FIGS. 1 to 4) according to the above-described embodiment is used. The pair of rolling flat dies 10A and 10B are arranged such that the processing surfaces 12 face each other.

  Further, the pair of rolling flat dies 10A and 10B are arranged in a point-symmetrical manner with the tangential direction of the round bar member 40, which is a rolled product, as the length direction and the rotation center axis O of the round bar member 40 as a center. Is done. In FIG. 5, the length direction one side of one rolling flat die 10A is shown by the arrow A side, and the length direction other side of one rolling flat die 10A is shown by the arrow B side. One side in the length direction of the other rolling flat die 10B is indicated by an arrow A 'side, and the other side in the length direction of the other rolling flat die 10B is indicated by an arrow B' side.

  The drive unit 34 is configured by, for example, a motor drive device or the like, and reciprocates one rolled flat die 10A with the one fixed unit 32A relative to the other rolled flat die 10B.

  That is, as shown in the upper diagram of FIG. 5, when one rolling flat die 10 </ b> A is moved forward, one rolling flat die 10 </ b> A has its one side in the length direction (arrow A side) as the front side. The other rolling flat die 10B is moved from one side in the length direction (arrow A ′ side) to the other side (arrow B ′ side). On the other hand, as shown in the lower diagram of FIG. 5, when one rolling flat die 10A is moved backward, one rolling flat die 10A has its other side in the length direction (arrow B side) on the front side. The other rolling flat die 10B is moved from the other side in the length direction (arrow B ′ side) to the other side (arrow A ′ side).

  Next, a rolling method according to an embodiment of the present invention will be described.

  In the rolling method according to the present embodiment, the above-described rolling device 30 is used. Before the round bar member 40 supplied to the rolling device 30 is processed by the rolling device 30, the outer peripheral surface 42 is roughly cut to make the outer peripheral surface 42 into a stepped shape. As an example, the round bar member 40 is a shaft (more specifically, a motor shaft) having a worm.

  The round bar member 40 whose outer peripheral surface 42 is roughly cut is supplied between a pair of rolled flat dies 10A and 10B, as shown in the upper diagram of FIG. When the round bar member 40 is supplied to the pair of rolled flat dies 10A, 10B, one rolled flat die 10A is moved to one side in the length direction (arrow A ′ side) of the other rolled flat die 10B. It is assumed that Note that both axial ends of the round bar member 40 supplied between the pair of rolled flat dies 10A and 10B are supported by support dies 38 (see FIG. 6).

  When the round bar member 40 is supplied between the pair of rolled flat dies 10A and 10B, the drive unit 34 operates, and as shown in the lower diagram of FIG. 5, one rolled flat die 10A has its length. With the one side in the length direction (arrow A side) as the front side, the other rolling flat die 10B is moved from one side in the length direction (arrow A ′ side) to the other side (arrow B ′ side).

  At this time, as shown in the upper diagram of FIG. 6, in the initial stage of processing, the round bar member 40 is disposed between the smoothed surfaces 14 formed on the pair of rolled flat dies 10 </ b> A and 10 </ b> B. The pair of smoothing surfaces 14 are pressed against the outer peripheral surface 42 of the bar member 40. Moreover, the round bar member 40 is rotated with the movement of one rolling flat die 10A, and the outer peripheral surface 42 of the round bar member 40 is smoothed by the pair of smoothing surfaces 14 (the smoothing step).

  The round bar member 40 is moved in the same direction (arrow A side) as the moving direction of the one rolling flat die 10A while rotating with the movement of the one rolling flat die 10A.

  Further, when this round bar member 40 is moved in the same direction as the moving direction of one rolling flat die 10A, in one rolling flat die 10A, from one side in the length direction (arrow A side). Relative movement is made to the other side (arrow B side), and the other rolling flat die 10B is relatively moved from one side in the length direction (arrow A ′ side) to the other side (arrow B ′ side). That is, when one rolling flat die 10A is moved forward, the round bar member 40 rotates from the smoothing surface 14 side to the rolling surface 16 side with respect to each of the pair of rolling flat dies 10A and 10B. While moving relative.

  As shown in the middle diagram of FIG. 6, in the middle stage of machining after the initial stage of machining, a round bar member 40 is disposed between the pair of rolling surfaces 16, and the outer circumferential surface of the round bar member 40. The pair of rolling surfaces 16 are pressed against 42. Further, the round bar member 40 is rotated with the movement of one rolling flat die 10 </ b> A, and a thread 44 is formed on the outer peripheral surface 42 of the round bar member 40. The height of the thread 44 is increased as it shifts from the middle stage of machining to the latter stage of machining as shown in the middle to lower figures of FIG. 6 (the rolling process). In the present embodiment, the thread 44 is formed on the outer peripheral surface 42 of the round bar member 40 in the manner described above.

  In addition, when one rolling flat die 10A is moved to the other length direction other side (arrow B 'side) of the other rolling flat die 10B as shown in the lower drawing of FIG. It is discharged from between the rolling flat dies 10A and 10B. Thus, when the round bar member 40 is discharged from between the pair of rolling flat dies 10A and 10B, the drive unit 34 operates in the reverse direction, and one rolling flat die 10A has the other in the longitudinal direction. With the side (arrow B side) as the front side, the other rolling flat die 10B is moved from the other side (arrow B ′ side) in the length direction to the other side (arrow A ′ side), and is shown in the upper view of FIG. Return to original position.

  Next, the operation and effect of one embodiment of the present invention will be described.

  First, a comparative example will be described in order to clarify the operation and effect of the present embodiment. In this comparative example, a rolling flat die 10 according to this embodiment in which the smoothing surface 14 is omitted is used. That is, the outer peripheral surface 42 of the round bar member 40 is subjected to a rolling process without being smoothed after being rough-cut.

  However, this comparative example has the following problems. That is, as shown in FIG. 11, when the outer peripheral surface 42 of the round bar member 40 is roughened, a streak-like processed mark 46 (unevenness) is formed on the outer peripheral surface 42. When the round bar member 40 is rolled while the streak-like processing marks 46 are formed on the outer peripheral surface 42, the thread 44 may be damaged 48 as shown in FIG. The scratch 48 may cause a crack or a chip due to aging.

  On the other hand, in order to suppress the formation of streak-like machining marks 46 on the outer peripheral surface 42, the feed rate when roughing the outer peripheral surface 42 of the round bar member 40 is slowed down, or the streak-like processing marks generated by roughing are performed. In order to eliminate 46, it is conceivable that the outer peripheral surface 42 of the round bar member 40 after roughing is smoothed in a separate step before the rolling process. However, in these cases, the processing time becomes long, which increases the cost.

  On the other hand, as shown in FIGS. 1 and 2, in this embodiment, a smoothing surface 14 is formed on the rolling flat die 10 in addition to the rolling surface 16. 6, the outer peripheral surface 42 of the round bar member 40 is smoothed by the smoothing surface 14 before the rolling process by the rolling surface 16.

  Therefore, even when the outer peripheral surface 42 of the round bar member 40 is rough-cut before the rolling process, and a streak-like processing mark is formed on the outer peripheral surface 42, the round bar member is formed by the smoothing surface 14. By smoothing the outer peripheral surface 42 of 40, as shown in FIG. 7, this processing trace can be eliminated or miniaturized. Thereby, even when the outer peripheral surface 42 of the round bar member 40 is rolled after rough cutting, it is possible to suppress the thread 44 from being damaged as shown in FIG.

  And since the smoothing surface 14 is formed in the rolling flat die 10 with the rolling surface 16, in the same processing process using this rolling flat die 10, smoothing processing by the smoothing surface 14; The rolling process by the rolling surface 16 is performed continuously. Thereby, for example, when the feed rate when roughing the outer peripheral surface 42 of the round bar member 40 is slowed, or the outer peripheral surface 42 of the round bar member 40 after roughing is smoothed in a separate process before rolling. Compared to, the processing time can be shortened. As a result, even if the outer peripheral surface 42 is smoothed before the thread 44 is formed on the outer peripheral surface 42, an increase in cost can be suppressed.

  Thus, according to the present embodiment, it is possible to suppress the thread 44 from being damaged during the rolling process while suppressing an increase in cost. Thereby, the quality and durability of the thread 44 can be ensured.

  Moreover, in the rolling flat die 10 used in the present embodiment, the smoothing portion 24 in which the smoothing surface 14 is formed and the rolling portion 26 in which the rolling surface 16 is formed are separated from each other. ing. Therefore, since the rolling surface 16 and the smoothing surface 14 can be maintained separately (for example, re-polishing), the quality after processing of the thread 44 can be improved while suppressing an increase in cost.

  Further, since the smoothing unit 24 and the rolling unit 26 are separated from each other, the rolling unit 26 and the smoothing unit 24 can be manufactured separately, so that the rolling flat die 10 can be manufactured. It becomes easy and the cost increase of the rolling flat die 10 can also be suppressed.

  Next, a modification of one embodiment of the present invention will be described.

  In the above embodiment, the smoothing surface 14 formed on the rolling flat die 10 is formed as a mirror surface as an example. However, as shown in FIGS. The slip suppression surface 50 made into the surface may be formed. The slip suppression surface 50 has a surface roughness smaller than, for example, machining marks (unevenness) formed on the outer peripheral surface of the round bar member by roughing. Such a slip suppression surface 50 is formed by, for example, shot blasting or honing.

  Further, the slip suppression surface 50 may be formed on the entire smoothing surface 14 as shown in FIG. 9, and as shown in FIG. They may be formed on both ends in the axial direction of the bar member.

  As described above, when the smoothing surface 14 is formed with the rough slip prevention surface 50, the outer surface of the round bar member is smoothed when the outer surface of the round bar member is smoothed by the smoothing surface 14. Slip between the surface and the smoothing surface 14 can be suppressed by the slip suppression surface 50. Thereby, since a round bar member can be rotated exactly by the smoothing surface 14, the outer peripheral surface of a round bar member can be smoothed more effectively by this smoothing surface 14.

  Also, as shown in FIG. 10, when the slip suppression surface 50 is formed on the lateral width direction end side of the smoothing surface 14, the slip suppression surface 50 is a thread formation region on the outer peripheral surface of the round bar member. Since it is located on the end side, it is possible to suppress the slip suppression surface 50 formed by this rough surface from affecting the quality of the thread. Thereby, the quality of a thread can be ensured.

  In the modification shown in FIG. 10, the slip suppression surface 50 is formed on both ends of the smoothing surface 14 in the lateral width direction. However, the slip suppression surface 50 is formed only on one end side of the smoothing surface 14 in the width direction, and may not be formed on the other end side of the smoothing surface 14 in the width direction.

  Further, in the case where the smoothing surface 14 is formed of a mirror surface as in the above-described embodiment, a pair shown in FIGS. 5 and 6 is used to suppress slippage between the outer peripheral surface of the round bar member and the smoothing surface. An anti-slip agent may be interposed between the outer peripheral surface 42 of the round bar member 40 and the smoothing surface 14 during processing using the rolling flat dies 10A and 10B.

  Moreover, in the said embodiment, although the round bar member 40 (refer FIG. 5, FIG. 6) is made into the shaft (more specifically, motor shaft) which has a worm as an example, it is screws, such as a screw and a volt | bolt. It may be a member having a mountain.

  Moreover, in the said embodiment, although the drive part 34 is set as the structure which moves only one of a pair of rolling flat dies 10A and 10B, both of a pair of rolling flat dies 10A and 10B are mutually different. It may be configured to move in the direction.

  Moreover, in the said embodiment, although the smoothing part 24 in which the smoothing surface 14 was formed, and the rolling part 26 in which the rolling surface 16 was formed are made into a different body, you may make it integral. .

  It should be noted that modifications that can be combined among the plurality of modifications may be combined as appropriate. Moreover, the modification regarding the rolling flat die 10 among the plurality of modifications may be applied to the rolling device 30 and the rolling method according to the present embodiment.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Rolling flat die, 12 ... Work surface, 14 ... Smoothing surface, 16 ... Rolling surface, 18 ... Blade, 24 ... Smoothing part, 26 ... Rolling part, 28 ... Notch part, 30 ... Rolling device, 32A, 32B ... Fixed part, 34 ... Drive part, 36 ... Opposing surface, 38 ... Supporting die, 40 ... Round bar member, 42 ... Outer peripheral surface, 44 ... Screw thread, 46 ... Process mark, 48 ... Scratch, 50 ... Slip suppression surface, O ... Rotation center axis

Claims (12)

A smoothed surface that is pressed against a roughly cut outer peripheral surface of a round bar member that is a rolled product, and smoothes the outer peripheral surface;
Formed alongside the smoothed surface in the tangential direction of the round bar member, pressed against the outer peripheral surface smoothed by the smoothed surface, and a rolling surface that forms a thread on the outer peripheral surface;
Rolled flat dies with The smoothing surface is formed with a rough slip prevention surface,
The rolled flat die according to claim 1. The slip suppression surface is formed on an end side in the width direction of the smoothing surface.
The rolled flat die according to claim 2. A smoothing portion on which the smoothing surface is formed;
A rolling part formed with the rolling surface;
With
The smoothing part and the rolling part are separate from each other.
The rolling flat die according to any one of claims 1 to 3. A pair of rolling flat dies disposed symmetrically with respect to the center axis of rotation of the round bar member, with the tangential direction of the round bar member being the rolled material as the length direction,
One of the pair of rolled flat dies, with one side in the length direction of the one rolled flat die as the front side, the one rolled flat die is connected to the other rolled flat die of the pair of rolled flat dies. A drive unit that moves from one side to the other in the length direction;
With
Each of the pair of rolled flat dies,
A smoothing surface that is formed on one side in the length direction of the rolled flat die and pressed against the outer peripheral surface roughly cut in the round bar member to smooth the outer peripheral surface;
A rolling surface formed on the other side of the smoothed surface in the length direction of the rolling flat die, pressed against the outer peripheral surface smoothed by the smoothing surface, and forming a thread on the outer peripheral surface; ,
Rolling equipment having. The smoothing surface is formed with a rough slip prevention surface,
The rolling device according to claim 5. The slip suppression surface is formed on an end side in the width direction of the smoothing surface.
The rolling device according to claim 6. Each of the pair of rolled flat dies,
A smoothing portion on which the smoothing surface is formed;
A rolling part formed with the rolling surface;
With
The smoothing part and the rolling part are separate from each other.
The rolling apparatus as described in any one of Claims 5-7. One of the pair of rolling flat dies is moved with respect to the other in a state where the smoothed surface formed on the pair of rolling flat dies is pressed against the outer peripheral surface of the round bar member to be rolled, which is to be rolled. Thus, a smoothing step of smoothing the outer peripheral surface by the smoothing surface while rotating the round bar member,
By moving one of the pair of rolling flat dies with respect to the other while pressing the rolling surface formed on the pair of rolling flat dies against the outer peripheral surface smoothed by the smoothing step. A rolling step of forming a thread on the outer peripheral surface by the rolling surface while rotating the round bar member;
A rolling method comprising: As the rolled flat die, a rolled flat die in which a smoothing surface is formed with a roughened slip suppressing surface is used.
The rolling method according to claim 9. As the rolling flat die, a rolling flat die in which the slip suppression surface is formed on the side in the width direction of the smoothing surface is used.
The rolling method according to claim 10. As the rolled flat die, a rolled flat die in which the smoothed portion formed with the smoothed surface and the rolled portion formed with the rolled surface are separated from each other,
The rolling method as described in any one of Claims 9-11.

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