JP3325104B2 - Method of manufacturing spiral rod with ridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive feed rod for moving a print head of a small printer, a rod for a coating device used for a device for applying a coating liquid to a continuously running belt-shaped support, and the like. The present invention relates to a method for manufacturing a rod having a helical ridge, and more particularly to a technique for forming the helical ridge by a rolling process and at the same time, making the crest a predetermined smooth surface.

[0002]

2. Description of the Related Art A rod material is sandwiched between a pair of rolled round dies disposed substantially parallel to each other, and the rod material is rotated about an axis following the rotation of the rolled round die. Roll forming of a spiral ridge on the outer peripheral surface of the rod material is widely performed by threading or the like.
FIG. 8 shows an example of a rolling machine that performs such a rolling process, and includes a pair of rolled round dies 100 and 102 and a rod material 104.
And a roll supporting die 106 for supporting the rod material 104 between the rolling round die 102 and the rolling round die 102 by approaching the rolling round die 100 from the right side of the drawing. Is rotated by a motor or the like to rotate the rod material 104 and the rolled circular die 100 around the respective axes so that the rod material 10 is rotated.
A spiral ridge is roll-formed on the outer peripheral surface of No. 4.

Here, if the dimension X from the upper end of the material supporting blade 106 to the straight line passing through the axis of the two rolling dies 100, 102 is too large, the dimension X of the rolling dies 100, 102 is too large.
While the rod material 104 is strongly pressed by the material supporting blade 106 by the rolling force of 102, welding occurs on the material supporting blade 106, and a rolling defect such as peeling of the outer peripheral portion of the rod material 104 occurs. If the rod material 104 is too small, the rod material 104 protrudes upward during rolling. Therefore, the value is set as small as possible within a range where the rod material 104 does not protrude. Is 0. 0 from the radius of the product after rolling.
A value larger than about 0.5 to 0.2 mm is used as a guide.
Since the adjustment of the dimension X is important as described above, the material supporting blade 106 is moved by a height adjusting mechanism as described in, for example, Japanese Utility Model Publication No. 37-14140 and Japanese Patent Publication No. 60-55205. The rolling round dies 100 and 102 can be moved toward and away from a straight line passing through the axis. Further, as described in Japanese Patent Publication No. 54-27306, for example, a V
The groove is machined to arrange a cylindrical roller, and the roller supports the rod material 104. The roller is driven to rotate with the rotation of the rod material 104 during the rolling process. It is also considered to reduce resistance and friction.

On the other hand, as a means for guiding a print head of an OA equipment device, particularly a small printer to a predetermined position, there is a positive feed rod system driven by using a positive feed rod. Tokiwa 4-69
As described in Japanese Patent Publication No. 298, it has been proposed to manufacture using the above-mentioned rolling process. That is,
The spiral groove is rolled using a pair of rolled round dies, but since both sides of the groove are raised and a spiral mountain is formed, the guide performance of the print head is hindered as it is. Therefore, the top of the spiral ridge is removed by centerless grinding to form a sliding contact surface with the inner surface of the through hole provided in the print head, so that the print head can be moved smoothly.

[0005] Further, a rod for a coating device used in a device for applying a coating solution to a continuously running belt-like support is also disclosed in, for example, JP-A-3-189039 and JP-A-5-90539.
No. 347, Japanese Unexamined Patent Application Publication No. 5-293580, and the like, it has been proposed to manufacture by using a rolling process. Such a rod can also be rolled using a rolling machine shown in FIG.
In any of the rolling methods described in the above publications, through-rolling, that is, a pair of rolling circles that are rotationally driven in synchronization with each other by forcibly feeding a rod material to be rolled in the axial direction thereof. The spiral ridge having a predetermined twist angle is rolled by a die. In this case, for example, as shown in FIG. 9A, a pair of rolled round dies 110,
The outlet side of the rod material 114 on the outer peripheral surface of the 112 is formed into a smooth cylindrical surface 116, or one of a pair of rolled round dies 118 and 120 as shown in FIG. A predetermined smooth surface is formed on the top of the rolled spiral mountain by coaxially combining 118 with a rolling die 122 having irregularities on the outer peripheral surface and a plain die 124 having a smooth outer peripheral surface. A technique is disclosed that reduces the wear rate of the rod and prevents the lower coating film from being damaged during sequential application of two or more layers. It has also been proposed that not only the exit side of the rod material but also at least one of a plurality of rolled round dies be used as a plane die to form a smooth surface on the top of the spiral mountain as described above.

[0006]

However, in manufacturing the positive feed rod, since the top of the spiral ridge is removed by centerless grinding after rolling, high dimensional accuracy is stably obtained. In addition to being difficult to obtain, the ground surface becomes rough and the metal structure is cut off, and the wear resistance decreases. In addition, since it is necessary to perform such centerless grinding, it takes a long time to manufacture, and the manufacturing cost increases.

On the other hand, in the case of a rod for a coating device, since the top of the spiral ridge is made a smooth surface during rolling, there is no problem as in the positive feed rod. However, the abrasion resistance performance and the performance of preventing scratches on the lower coating film differ depending on the height (groove depth) of the spiral ridge and the width of the smooth surface, and the hill height and the smooth surface width are determined by the cylindrical surface 116 and the plane die. Although it depends on the diameter of the rod 124, the relationship between the diameter and the peak height or the smooth surface width differs depending on the rod material and the like.
In the case of through-rolling, since a predetermined inclination is generally given to the axis of a pair of dies, it is difficult to determine the diameter by an arithmetic expression or the like. For this reason, it is necessary to find the diameter of the desired peak height and the smooth surface width by trial and error, and various types of dies having different diameters of the cylindrical surface are prepared and the test processing is performed while changing the setup. The shape, peak height, and smooth surface width of the spiral ridge that provides the desired performance also differ depending on the type and amount of the coating liquid, and the above-described diameter dimensions need to be set according to such coating conditions. is there. In addition,
In the case of FIG. 9A in which the outer peripheral portions of the pair of rolled round dies are both cylindrical surfaces on the outlet side of the rod material, the top of the spiral mountain is crushed after rolling, so that the cross section of the spiral mountain is formed. There is a disadvantage that the shape changes.

The present invention has been made in view of the above circumstances, and an object of the present invention is to form a smooth surface on the top of a spiral mountain at the same time as the rolling process, and to increase the height of the spiral mountain. The purpose of the present invention is to make it possible to easily adjust the width of the sheath.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of clamping a rod material between a pair of rolled round dies arranged substantially in parallel, When the helical ridge is rolled on the outer peripheral surface of the rod material by rotating the rod material about the axis following the rotation, the rotation about the axis substantially parallel to the axis of the rod material is performed. The rod material is pressed according to the rolling force of the rolled round die on a cylindrical rotary rest that is disposed so as to support the rod material, and the rolled round die is rolled. The support position is adjusted so that the top of the spiral mountain is plastically deformed by the rotary rest to form a smooth surface of a predetermined width.
The height of the rotary rest is adjusted by an adjusting mechanism . The rod material may be rolled while being held at a predetermined position, or may be rolled while being forcibly fed in the axial direction.

[0010]

That is, the conventional material supporting blade for supporting the rod material has the dimension X (see FIG. 8).
Although the rod material was set to be as small as possible within a range where the rod material does not protrude, in the method of the present invention, a cylindrical rotary rest is provided instead of the material supporting blade, and the height of the rotary rest, that is, Dimension X above
Is adjusted by the support position adjusting mechanism so that the rod material is positively pressed against the rotary rest according to the rolling force of the rolling round die, and the top of the rolled spiral mountain is plastically deformed to a predetermined value. Thus, a smooth surface having a width of is formed. In this case, if the dimension X is changed, the distance from the axis of the rod material to the axis of the rolled round die changes to change the rolling depth, and the distance between the rod material and the rotary rest is changed. Since the pressing force changes and the amount of plastic deformation at the top of the spiral ridge changes, the height of the spiral ridge and the width of the smooth surface can be easily adjusted by changing the dimension X. In addition, since the rotary rest is rotated around the axis following the rotation of the rod material, even if a large pressing force acts between them, the friction is small, and the outer periphery of the rod material is peeled off by welding or the like. In addition, since the top of the spiral ridge is smoothly crushed by the rotary rest while rolling with a pair of rolling dies, a spiral ridge corresponding to the groove shape of the rolling dies is formed.

As described above, since a smooth surface can be formed on the top of the spiral ridge simultaneously with the rolling process, if the positive feed rod is manufactured by this manufacturing method, centerless grinding becomes unnecessary, and high dimensional accuracy can be stably achieved. As well as being obtained, the surface roughness of the top of the spiral ridge is improved and the metal structure is dense and continuous, so that excellent wear resistance is obtained, and the production time is greatly reduced. Manufacturing costs are reduced. On the other hand, in the method of the present invention, since the height of the spiral ridge and the width of the smooth surface can be easily adjusted only by changing the dimension X, a smooth surface is formed on the top of the spiral ridge by using a plane die having a smooth outer peripheral surface. As compared to the case where various dies having different diameters are prepared and the setup is performed and the diameters are set by trial and error as in the case of forming, the preparation time until the actual processing can be greatly reduced. In addition, the cost required for a test die or the like is not required, and the manufacturing cost can be reduced.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a rolling machine that can suitably carry out the method of the present invention. A pair of rolled round dies 10 and 12 are arranged so that their axes O1 and O2 are substantially horizontal and substantially parallel to each other. It is arranged so as to be rotatable around, and is driven to rotate in synchronization with each other by a motor or the like (not shown). Rolled round dies 10 and 12 are provided with rolled surfaces 14 and 16 provided on the outer periphery thereof with irregularities having a cross-sectional shape corresponding to grooves or ridges to be rolled. , 16 have one end in the axial direction, that is, FIG.
A biting portion, a finishing portion, and a relief portion are provided from the front side of the paper surface of FIG. The cylindrical rod material 18 to be rolled is supported by the material support 20 between the pair of rolled round dies 10 and 12 in a posture substantially parallel to the axes O1 and O2. The paper is forcibly fed in the direction of the center, specifically, from the front side to the back side of the paper. Thus, the rod material 18 is pinched by the rolled round dies 10 and 12 from the left and right sides, and rotates around the axis Ow (see FIG. 3) following the rotation of the rolled round dies 10 and 12. The spiral mountain is rolled on the outer peripheral surface. In the case of through-rolling in which the rod material 18 is forcibly fed in the axial direction as described above, the rolling round dies 10, 1
The irregularities formed on the rolling surfaces 14 and 16 of No. 2 may be twisted at a predetermined twist angle or may be zero.
The feed speed of the rod material 18 is set in accordance with the torsion angle and the rotation speed of the rolling round die 12 so that a spiral ridge having a desired torsion angle is rolled.

As shown in detail in FIG. 2, the material support table 20 includes a cylindrical rotary rest 22, a support plate 24 that supports the rotary rest 22 so as to be rotatable about an axis, and And a holding table 26 for integrally holding the support plate 24 at the upper end. The axis of the rotary rest 22 is aligned with the axis O1, O2.
The rod material 18 is disposed on the table 28 in a position substantially parallel to the position 2, and is supported in a state of contacting the outer peripheral surface of the rotary rest 22 in a position substantially parallel to the axis of the rotary rest 22. The rotary rest 22 is provided with a support shaft 30 penetrating the shaft center or provided only at both ends in the axial direction.
, And is rotatably supported by the support plate 24 around the axis. In the case where the axial dimension of the rotary rest 22 is long, for example, a backup roll may be provided as necessary to prevent the rotary rest 22 from bending and deforming. Further, the support plate 24 is integrally fitted to the holding base 26 by being tightened by the bolts 34 screwed to the holding base 26 in a state of being fitted into the slit 32 formed on the upper part of the holding base 26. It is designed to be attached.

The table 28 is vertically guided by a plurality of guide pins 36. The table 28 is moved up and down by rotating a pinion 40 meshed with a rack 38, and is also provided with a compression coil spring or the like. The spring member 42 is always biased downward. The pinion 40 is non-rotatably attached to a rotation shaft 46 rotatably disposed about a substantially horizontal axis by a support bracket (not shown) fixedly mounted on the base 44, and attached to the rotation shaft 46. The worm wheel 48 is similarly non-rotatably mounted and meshed with the worm 50. Warm 5
0 is a height adjustment dial 52 provided on the base 44
Is rotated by the rotation operation, and the worm wheel 48 and the pinion 40 are rotated accordingly, whereby the table 28 is moved in the vertical direction. Thereby, the height X of the material support table 20, in other words, the dimension X (see FIG. 1) from the support position of the rod material 18, which is the upper end of the rotary rest 22, to the straight line L passing through the axis O1, O2 is adjusted. You. In the present embodiment,
Worm 50, worm wheel 48, pinion 40, la
Adjust the height of the rotary rest 22 with the hook 38
A support position adjusting mechanism is configured.

If the dimension X is sufficiently larger than the radius of the rod material 18, as shown in FIG. 3, the rolling force Ft applied to the rod material 18 by the two rolling dies 10, 12 is reduced. Is increased, and the rod material 18 is rotated with a large force corresponding to the component force.
Pressed to. In other words, the rotary rest 22
Is pressed against the rod material 18 by the reaction force Fr of the above-described component force. The spiral mountain rolled on the outer peripheral surface of the rod material 18 by the two rolled round dies 10 and 12 is opposed to the rotary rest 22. Plastically deformed by force Fr and crushed,
A predetermined smooth surface is formed on the top.

In this case, if the dimension X is changed by the height adjusting dial 52, the axis Ow of the rod material 18 is changed.
, The distance from the rolling dies 10 and 12 to the axes O1 and O2 changes, and the rolling depth changes, and the reaction force Fr of the rotary rest 22 pressing the rod material 18 changes to change the spiral mountain. Since the amount of plastic deformation at the top of the spiral changes, the height of the spiral mountain and the width of the smooth surface can be easily adjusted by changing the dimension X. Further, since the rotary rest 22 is rotated about the axis following the rotation of the rod material 18, even if a large reaction force Fr acts between them, the friction is small, and the outer peripheral portion of the rod material 18 is welded or the like. Since the top of the helical ridge is smoothly crushed by the rotary rest 22 while being rolled by the pair of rolled round dies 10, 12, the rolled processing surface of the rolled round dies 10, 12 is not peeled off. Spiral ridges corresponding to the groove shapes formed on the grooves 14 and 16 are formed.

FIG. 4 shows an example of a positive feed rod as a helical ridged rod rolled by the rolling machine of FIG. 1 in accordance with the method of the present invention. Has two spiral grooves 62 and 64 each having a pitch P1.
= 15.875 mm, which are displaced from each other by a half pitch so that they can be inserted through a through hole provided in a print head (not shown), and any of the engagement protrusions protruding from the inner surface of the through hole is formed in a spiral shape. When the positive feed rod 60 is rotated around the axis while being engaged with the groove 62 or 64, the print head is linearly moved in the axial direction of the positive feed rod 60. A relatively shallow auxiliary groove 66 is formed spirally at the same pitch P1 between the pair of spiral grooves 62, 64.
A total of four spiral ridges 68 are formed at the portions between 64 and 66 due to the rise of the excess thickness, and the top of the spiral ridges 68 is apparent from the enlarged sectional view of FIG. Is pressed by the rotary rest 22 to form a smooth surface 70. The smooth surface 70 is a portion that is slid on the inner surface of the through hole of the print head. The smooth surface 70 is located on a cylindrical surface having a constant radius and is engaged with a wide area of the inner surface of the through hole. Therefore, the print head can be smoothly moved in a fixed posture. The two spiral grooves 62 and 64 and the auxiliary groove 66 are formed because they can be rolled in a well-balanced manner even when the pitch P1 is relatively large in order to perform high-speed feeding, and have four spiral ridges 68. By forming the smooth surfaces 70 on the tops of the print heads, the smooth surfaces 70 are engaged with a wide range of the inner surface of the through hole of the print head having a relatively short size, thereby stabilizing the posture of the print head. Further, the outer diameter D of the positive feed rod 60 of this embodiment is 7.9 mm, the depth H1 of the spiral grooves 62 and 64 is 1 mm, and the depth H2 of the auxiliary groove 66 is 0.35 mm.
However, these dimensions can be easily adjusted by changing the dimension X with the height adjustment dial 52. In addition,
On the rolled processing surfaces 14, 16 of the rolled round dies 10, 12,
The height dimension is 1 mm for rolling the spiral grooves 62 and 64
And the auxiliary groove 6 is provided.
In order to roll the No. 6, a ridge having a height dimension higher than 0.35 mm is provided.

As described above, when the positive feed rod 60 is manufactured according to the method of the present invention, the spiral ridge 6 is formed simultaneously with the rolling.
Since the smooth surface 70 can be formed on the top of the surface 8, higher dimensional accuracy can be obtained more stably than in the conventional case where the smooth surface 70 is post-processed by centerless grinding or the like. Since the surface roughness is improved and the metal structure is dense and continuous, excellent wear resistance is obtained, and the production time is greatly reduced and the production cost is reduced.

FIG. 6 shows a rod 72 for a coating device as a helical ridged rod manufactured according to the method of the present invention using the SUS 304 having a diameter of 12.7 mm as the rod material 18 by the rolling machine of FIG. FIG. 4 is a partial cross-sectional view showing the outer peripheral shape in an enlarged manner, showing a spiral mountain 7 having a pitch P2 = 0.2 mm
4 and a smooth surface 76 is formed on the top of the spiral mountain 74 by the rotary rest 22. In this case, the depth of 0.0329
The rolling process was performed by using the rolling round dies 10 and 12 provided with concave grooves having a sectional shape corresponding to the spiral ridge 74 in mm and changing the dimension X variously by the height adjusting dial 52. It can be seen that the height H3 of the spiral ridge 74 and the width W of the smooth surface 76 change as shown in FIG. 7, and that the height H3 and the width W can be finely adjusted by changing the dimension X. The axis of abscissa in FIG. 7 is the axis O of the rolled round dies 10, 12.
It is a value obtained by subtracting the radius r of the rod material 18 from the dimension X by the dimension Y from the straight line L passing through 1 and O2 to the axis Ow of the rod material 18.

As described above, when the coating device rod 72 is rolled according to the method of the present invention, the height (groove depth) of the spiral ridge 74 is changed only by changing the dimension X by the height adjustment dial 52. ) Since H3 and the width W of the smooth surface 76 can be easily adjusted, the diameter dimension is reduced as in the case where a smooth surface is formed on the top of the spiral mountain using a plain die or the like having a smooth outer peripheral surface as in the related art. Compared to preparing various different dies and performing test processing while setting up and setting the diameter, the preparation time before performing this processing can be significantly reduced, and the cost required for test dies etc. is reduced. It becomes unnecessary and the manufacturing cost can be reduced.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be embodied in other forms.

For example, in the above embodiment, the positive feed rod 6
0, the case of rolling the coating device rod 72 has been described. However, the present invention is similarly applied to the case of rolling other spiral ridged rods having a spiral ridge with a smooth top. obtain.

Further, in the above-described embodiment, a description has been given of the through-rolling in which the rod material 18 is forcibly fed in the axial direction. However, a pair of rolled round dies are moved toward and away from the rod material held at a fixed position. The present invention can also be applied to a case where a rolling process is performed.

In the above embodiment, the height of the rotary rest 22 is adjusted by the worm 50, the worm wheel 48, the pinion 40, and the rack 38. However, other supports using a wedge member, a link mechanism, or the like are used. It is also possible to employ a position adjusting mechanism, or it is also possible to rotate a motor or the like by operating a switch to make adjustment.

Although not specifically exemplified, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a front view illustrating an example of a rolling machine that can suitably carry out the method of the present invention.

FIG. 2 is a sectional view showing a rotary rest height adjusting mechanism in the rolling machine of FIG. 1;

FIG. 3 is a view illustrating a reaction force applied to a rod material from a rotary rest in the rolling machine of FIG. 1;

FIG. 4 is a front view showing an example of a positive feed rod manufactured according to the method of the present invention using the rolling machine of FIG. 1;

FIG. 5 is a partially enlarged sectional view showing the vicinity of the outer peripheral portion of the positive feed rod of FIG. 4;

6 is a partially enlarged sectional view showing the vicinity of an outer peripheral portion of a rod for a coating apparatus manufactured by using the rolling machine of FIG. 1 according to the method of the present invention.

7 is a diagram showing measurement results of a height H3 of a spiral ridge and a width W of a smooth surface when the rod for a coating apparatus of FIG. 6 is rolled while changing the dimension X of FIG. 1;

FIG. 8 is a front view showing an example of a conventional rolling machine.

FIG. 9 is a view for explaining a conventional rolled round die used when manufacturing by rolling through a rod for a coating apparatus.

[Explanation of symbols]

10, 12: rolled round die 18: rod material 22: rotary rest 38: rack 40: pinion 48: worm wheel 50: worm 52: height adjustment dial 60: positive feed rod (spiral rod) 68, 74: spiral ridge 70, 76: smooth surface 72: rod for coating device (rod with spiral ridge)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21H 3/00 B05C 11/02 B41J 19/20 B05C 1/08

Claims (1)

(57) [Claims] 1. A method of clamping a rod material between a pair of rolled round dies disposed substantially in parallel, and rotating the rod material around an axis following rotation of the rolled round die. Thus, when the spiral ridge is rolled on the outer peripheral surface of the rod material, a cylindrical rotary member rotatably disposed around an axis substantially parallel to the axis of the rod material and supporting the rod material. The rod material is pressed against the rest according to the rolling force of the rolled round die, whereby the top of the spiral ridge rolled by the rolled round die is plastically deformed by the rotary rest to a predetermined shape. A smooth surface of width is formed
As described above, the rotary position of the rotary rest is adjusted by the support position adjusting mechanism.
A method of manufacturing a spiral ridged rod, wherein the height is adjusted .