JPH07185712A - Production of rod with spiral ridge - Google Patents

Abstract

PURPOSE:To easily regulate the height of a spiral ridge or the width of its smooth surface in a form rolling method which forms the smooth surface on the top of the roll formed spiral ridge at the same time with roll forming. CONSTITUTION:A rod blank 18 is supported with a rotary rest which can revolve around the axial center and regulates the height position, and a pair of form rolling round dies 11, 12 roll-form a spiral ridge on the outer circumferential surface of the rod blank 18 by driving with revolving while clamping the blank 18. In this time, the position of height of the rotary rest is regulated so that the required smooth surface is formed on the top of the roll formed spiral ridge with the reaction force Fr acting onto the rod blank 18 from the rotary rest 22 based on the roll forming force Ft.

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 in a device for applying a coating liquid to a continuously running strip-shaped support, and the like on the outer peripheral surface. The present invention relates to a method for manufacturing a rod having spiral ridges, and more particularly to a technique for forming the spiral ridges by a rolling process and at the same time making the peaks a predetermined smooth surface.

[0002]

2. Description of the Related Art A rod material is clamped between a pair of rolled round dies arranged substantially parallel to each other, and the rod material is rotated around its axis by following the rotation of the rolled round die. It is widely performed by threading etc. to form a spiral ridge on the outer peripheral surface of the rod material.
FIG. 8 is an example of a rolling machine that performs such rolling processing, and includes a pair of rolling round dies 100 and 102 and a rod material 104.
And a material support blade 106 for supporting the rolled material, and one of the rolled round dies 100 is moved closer to the right side of the drawing to pinch the rod material 104 between the rolled round die 102 and the rolled round die 102. The rod material 104 and the rolled round die 100 are driven to rotate around their respective axes by rotationally driving the rod material 10 with a motor or the like.
The outer peripheral surface of 4 is rolled to form a spiral mountain.

Here, if the dimension X from the upper end of the material supporting blade 106 to the straight line passing through the shaft centers of the both rolling round dies 100 and 102 is too large, the rolling round die 100,
The rod material 104 is strongly pressed by the material supporting blade 106 by the rolling force of the rod 102, welding is caused on the material supporting blade 106, and rolling defects such as the outer peripheral portion of the rod material 104 being scraped off occur, while the dimension X Is too small, the rod material 104 will protrude upward during rolling, so it is set to a value as small as possible within the range where the rod material 104 does not protrude, and it generally varies depending on the outer diameter of the rolling round dies 100 and 102, but Is 0 from the radius of the product after rolling.
A large value of about 05 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 adjusted 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 axes. Further, as described in, for example, Japanese Patent Publication No. 54-27306, a V is formed on the upper surface of the material supporting blade 106.
A groove is processed to arrange a cylindrical roller, and the rod material 104 is supported by the roller, so that the roller is driven to rotate along with the rotation of the rod material 104 during the rolling process, and the rod material 104 rotates. It is also considered to reduce resistance and friction.

On the other hand, there is a positive feed rod system in which a positive feed rod is used for driving as a means for guiding the print head of an OA equipment, especially a small printer to a predetermined position. Japanese Patent Fair 4-69
As described in Japanese Unexamined Patent Publication No. 298, it has been proposed to manufacture by using the above-mentioned rolling processing method. That is,
Although a spiral groove is rolled using a pair of rolling dies, the guiding performance of the print head is impaired as it is because both sides of the groove are raised and spiral ridges are formed. Therefore, the top of the spiral mountain 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.

Further, a rod for a coating device used in a device for coating a coating liquid on a continuously running strip-shaped support is also disclosed, for example, in Japanese Patent Laid-Open Nos. 3-189039 and 5-18939.
It has been proposed to manufacture by utilizing a rolling method as described in Japanese Patent No. 347, Japanese Patent Laid-Open No. 5-293580 and the like. Although such a rod can be rolled using the rolling machine shown in FIG. 8,
In each of the rolling methods described in the above publications, a pair of rolling circles are threaded through, that is, a rod material to be rolled is forcibly fed in the axial direction of the rod material and rotationally driven in synchronization with each other. A die is used to roll a continuous spiral ridge having a predetermined twist angle. In that case, for example, as shown in FIG. 9A, a pair of rolled round dies 110,
A portion of the outer peripheral surface of the rod 112 on the outlet side of the rod material 114 is formed as a smooth cylindrical surface 116, or one of a pair of rolled round dies 118 and 120, as shown in FIG. 118 is coaxially combined with a rolling die 122 having an outer peripheral surface having irregularities and a plain die 124 having a smooth outer peripheral surface to form a predetermined smooth surface on the top of the rolled mountain. Is disclosed to reduce the wear rate of the rod and prevent damage to the coating film of the lower layer during successive coating of two or more layers. It has been proposed to form not only the outlet side of the rod material but also at least one of a plurality of rolled round dies as a plane die to form a smooth surface on the top of the spiral mountain as described above.

[0006]

However, when manufacturing the positive feed rod, the top of the spiral ridge is removed by centerless grinding after the rolling process, so that high dimensional accuracy is stable. In addition to being difficult to obtain, the ground surface becomes rough and the metal structure is divided, resulting in a decrease in wear resistance. Further, since it is necessary to perform such centerless grinding, it takes time to manufacture and the manufacturing cost increases.

On the other hand, in the case of the rod for a coating apparatus, since the top of the spiral ridge has a smooth surface during rolling, it does not have the problem of the positive feed rod. However, the wear resistance performance and the flaw prevention performance of the lower layer coating differ depending on the height (groove depth) of the spiral mountain and the width of the smooth surface, and the mountain height and the smooth surface width are the cylindrical surface 116 and the plain die. Although it depends on the diameter of the rod 124, the relationship between the diameter and the height of the peak or the width of the smooth surface varies depending on the material of the rod and the like.
In the case of thread rolling, generally, a predetermined inclination is given to the shaft center of the pair of dies, so that it is difficult to obtain the diameter dimension by an arithmetic expression or the like. For this reason, it is necessary to obtain the desired ridge height and the diameter dimension to obtain the desired smooth surface width by trial and error, and various dies having different diameter dimensions of the cylindrical surface are prepared and the test processing is performed while changing the setup. Since the shape, peak height, and smooth surface width of the spiral ridge that achieves the desired performance vary depending on the type and amount of coating liquid, it is necessary to set the above-mentioned diameter dimensions according to such coating conditions. is there. In addition,
In the case of FIG. 9 (a) 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 the cross section of the spiral mountain is There is an inconvenience 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 increase the height of a spiral mountain when forming a smooth surface on the top of the spiral mountain simultaneously with the rolling process. It is to be able to easily adjust the width of the smooth surface.

[0009]

In order to achieve the above object, the present invention clamps a rod material between a pair of rolled round dies arranged substantially in parallel, and When the spiral ridge is rolled on the outer peripheral surface of the rod material by following the rotation and rotating the rod material around the axis, rotation around the axis substantially parallel to the axis of the rod material. The rod material is pressed according to the rolling force of the rolling round die to a cylindrical rotary rest that is movably arranged to support the rod material, thereby forming a predetermined smooth surface on the top of the spiral mountain. It is characterized in that it is formed. The rod material may be held in a predetermined fixed position and rolled, but the rod material may be rolled while being forcibly fed in the axial direction.

[0010]

In other words, in the conventional material support blade that supports the rod material, the dimension X (see FIG. 8) is
Although the rod material was set to have a value as small as possible within the range where it does not pop out, in the method of the present invention, a cylindrical rotary rest is provided instead of the material supporting blade, and the dimension X is relatively large. Then, 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 form a smooth surface. is there. In that case, if the dimension X is changed, the distance from the shaft center of the rod material to the shaft center of the rolling round die changes to change the rolling depth, and at the same time, between the rod material and the rotary rest. Since the pressing force changes and the amount of plastic deformation of 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. Also, since the rotary rest is rotated around the axis following the rotation of the rod material, the friction is small even if a large pressing force acts between them, and the outer peripheral portion of the rod material is scraped off by welding etc. In addition, since the top of the spiral ridge is flattened by the rotary rest while performing the rolling process with the pair of rolling round dies, the spiral ridge corresponding to the groove shape of the rolling round die is formed.

Since a smooth surface can be formed on the top of the spiral ridge at the same time as the rolling process as described above, if the positive feed rod is manufactured by this manufacturing method, centerless grinding is unnecessary and high dimensional accuracy is stable. 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 manufacturing time is significantly shortened. Manufacturing costs are reduced. On the other hand, in the method of the present invention, the height of the spiral ridge and the width of the smooth surface can be easily adjusted only by changing the dimension X. Compared with the case of forming various dies with different diameters and setting the diameters by trial and error while changing the setup, as in the case of forming, the preparation time until the main processing can be significantly shortened. Therefore, the cost required for the test die and the like becomes unnecessary and the manufacturing cost can be reduced.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an example of a rolling machine capable of suitably carrying out the method of the present invention, in which a pair of rolling round dies 10 and 12 have their axes O1 and O2 substantially horizontal and substantially parallel to each other. It is rotatably disposed around and is rotationally driven in synchronization with each other by a motor (not shown) or the like. The rolling round dies 10 and 12 are provided with rolling surfaces 14 and 16 on their outer peripheral portions, which are provided with irregularities having a cross-sectional shape corresponding to grooves and ridges to be rolled. , 16 has one axial end, that is, FIG.
From the front side of the sheet of paper, a biting part, a finishing part, and a relief part are provided. The cylindrical rod material 18 to be rolled is supported between the pair of rolling round dies 10 and 12 by the material support base 20 in a posture substantially parallel to the shaft centers O1 and O2, and It is designed to be forcibly fed from the front side of the paper, specifically from the front side of the paper. As a result, the rod material 18 is pinched by the rolling round dies 10 and 12 from both left and right sides, and is rotated around the axis Ow (see FIG. 3) following the rotation of the rolling round dies 10 and 12. Then, the spiral mountain is rolled on the outer peripheral surface. As described above, in the rolling rolling in which the rod material 18 is forcibly fed in the axial direction, the rolling round dies 10, 1
The concavo-convex formed on the second rolling surface 14, 16 may be twisted at a predetermined twist angle or may have a twist angle of 0,
The feed speed of the rod material 18 is set in accordance with the helix angle and the rotation speed of the rolled round die 12 so that the spiral ridge having a desired helix angle is rolled.

As shown in detail in FIG. 2, the material support base 20 has a cylindrical rotary rest 22 and a support plate 24 that supports the rotary rest 22 rotatably around its axis. A holding table 26 that integrally holds the support plate 24 at the upper end portion is provided, and the axis of the rotary rest 22 is the axis O1, O
2, the rod material 18 is supported in a state of being in contact with the outer peripheral surface of the rotary rest 22 in a posture substantially parallel to the axis of the rotary rest 22. The rotary rest 22 is provided with a support shaft 30 that penetrates the shaft center or is provided only at both ends in the shaft center direction.
Is supported by the support plate 24 so as to be rotatable about its axis. When the axial dimension of the rotary rest 22 is long, a backup roll may be provided as necessary to prevent the rotary deformation of the rotary rest 22 from bending. Further, the support plate 24 is fitted in the slit 32 formed in the upper portion of the holding table 26, and the bolts 34 screwed into the holding table 26 are tightened to integrally support the holding plate 26. It is supposed to be installed.

The table 28 is vertically guided by a plurality of guide pins 36. The table 28 is vertically moved by rotationally driving a pinion 40 engaged with a rack 38, and a compression coil spring or the like. The spring member 42 is always biased downward. The pinion 40 is non-rotatably attached to a rotary shaft 46 rotatably arranged around a substantially horizontal shaft center by a support bracket (not shown) fixedly mounted on the base 44, and is attached to the rotary shaft 46. The worm wheel 48 is also mounted so as not to rotate relative to the worm wheel 48 and is meshed with the worm 50. Warm 5
0 is a height adjustment dial 52 arranged on the base 44.
Is rotated by a rotating operation, and the worm wheel 48 and the pinion 40 are rotated accordingly, so that the table 28 is moved in the vertical direction. As a result, the height of the material support base 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 axes O1 and O2 is adjusted. It

Here, if the dimension X is sufficiently larger than the radius of the rod blank 18, as shown in FIG. 3, the rolling force Ft applied to the rod blank 18 by the both rolling round dies 10 and 12 is downward. The component force of the rod material 18 is increased by a large force corresponding to the component force of the rotary rest 22.
Pressed against. In other words, the rotary rest 22
Is pressed against the rod material 18 by the reaction force Fr of the above component force, and the spiral ridges formed by rolling on the outer peripheral surface of the rod material 18 by the both rolling round dies 10 and 12 are opposite to the rotary rest 22. It is crushed by being plastically deformed by the force Fr.
A predetermined smooth surface is formed on the top.

In that case, if the dimension X is changed by the height adjusting dial 52, the axial center Ow of the rod material 18 is changed.
To the shaft centers O1 and O2 of the rolling round dies 10 and 12 to change the rolling depth, the rotary rest 22 changes the reaction force Fr pressing the rod material 18 to change the spiral mountain. Since the amount of plastic deformation of the apex changes, the height of the spiral crest and the width of the smooth surface can be easily adjusted by changing the dimension X. Further, since the rotary rest 22 is rotated around the axis center 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. It is not scraped off, and the rolling rests of the rolling round dies 10 and 12 are used to smooth the tops of the spiral ridges with the rotary rest 22 while rolling with the pair of rolling round dies 10 and 12. A spiral crest corresponding to the groove shape formed in 14, 16 is formed.

FIG. 4 shows an example of a positive feed rod as a rod with spiral ridges, which is rolled according to the method of the present invention using the rolling machine of FIG. Is the pitch P1 of the two spiral grooves 62 and 64, respectively.
= 15.875 mm, which are offset from each other by a half pitch, can be inserted through a through hole provided in a print head (not shown), and an engaging projection protruding on the inner surface of the through hole can be any spiral shape. The print head is linearly moved in the axial direction of the positive feed rod 60 when the positive feed rod 60 is rotationally driven around the axial center while being engaged with the groove 62 or 64. A relatively shallow auxiliary groove 66 is spirally formed between the pair of spiral grooves 62 and 64 at the same pitch P1.
In the portion between 64 and 66, a total of four spiral ridges 68 are formed due to the swelling of the surplus, and the top of the spiral ridges 68 is clear from the enlarged sectional view of FIG. The smooth surface 70 is formed by being pressed by the rotary rest 22. The smooth surface 70 is a portion that is brought into sliding contact with 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 range of the inner surface of the through hole. Therefore, the print head can be smoothly moved in a fixed posture. Since the two spiral grooves 62 and 64 and the auxiliary groove 66 are formed, since the high-speed feed can be performed, even if the pitch P1 is relatively large, rolling can be performed with good balance, and the four spiral ridges 68 are formed. This is because the smooth surface 70 is formed on each apex and the smooth surface 70 is engaged with a wide range of the inner surface of the through hole of the print head having a relatively short dimension, and the posture of the print head is stabilized. 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 rolling surface 14, 16 of the rolling round die 10, 12,
Height is 1mm for rolling the spiral grooves 62, 64
A ridge larger than that of the auxiliary groove 6 is provided.
A ridge having a height dimension higher than 0.35 mm is provided in order to roll 6.

As described above, when the positive feed rod 60 is manufactured according to the method of the present invention, the spiral mountain 6 can be formed simultaneously with the rolling process.
Since the smooth surface 70 can be formed on the apex of the surface 8, high dimensional accuracy can be stably obtained as compared with the conventional case where the smooth surface 70 is post-processed by centerless grinding or the like. The surface roughness is improved and the metal structure is dense and continuous, so that excellent wear resistance is obtained, and the manufacturing time is significantly shortened and the manufacturing cost is reduced.

FIG. 6 shows a rod 72 for a coating device as a spiral mountain rod prepared by the method of the present invention using the rolling machine of FIG. 1 using SUS304 having a diameter of 12.7 mm as the rod material 18. FIG. 3 is a partial cross-sectional view showing an enlarged outer peripheral shape, showing a spiral mountain 7 with a pitch P2 = 0.2 mm.
4 and the rotary rest 22 forms a smooth surface 76 on the top of the spiral ridge 74. In that case, the depth of 0.0329 in the rolling surfaces 14 and 16.
When the rolling round dies 10 and 12 each having a cross-sectional concave groove corresponding to the spiral ridge 74 in mm are used, and the dimension X is variously changed by the height adjusting dial 52, the rolling process is performed. 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 the height H3 and width W thereof can be finely adjusted by changing the dimension X. The horizontal axis of FIG. 7 indicates the axis O of the rolled round dies 10 and 12.
1 is the dimension Y from the straight line L passing through O2 to the axis Ow of the rod material 18, and is the value obtained by subtracting the radius r of the rod material 18 from the dimension X.

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 simply changed by changing the dimension X with the height adjusting dial 52. ) Since the H3 and the width W of the smooth surface 76 can be easily adjusted, the diameter dimension can be reduced as in the conventional case where a smooth surface is formed on the top of the spiral mountain by using a plain die or the like having a smooth outer peripheral surface. Compared to the case where different types of dies are prepared and test processing is performed while changing the setup and the diameter is set, the preparation time until the main processing can be significantly shortened and the cost required for the test dies etc. 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 implemented in other modes.

For example, in the above embodiment, the positive feed rod 6 is used.
0, the case of rolling the coating device rod 72 has been described, but the present invention is similarly applied to the case of rolling another spiral mountain rod having a spiral mountain with a smooth top. obtain.

Further, in the above-mentioned embodiment, the thread rolling in which the rod material 18 is forcibly fed in the axial direction has been described. However, a pair of rolled round dies may be moved closer to or separated from each other so that the rod material 18 is held at a fixed position. The present invention can also be applied to the case where rolling is performed.

Further, 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, but other supports using a wedge member, a link mechanism, or the like. A position adjusting mechanism can be adopted, or a switch or the like can be used to rotationally drive and adjust a motor or the like.

Although not illustrated one by one, 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 drawings]

FIG. 1 is a front view illustrating an example of a rolling machine capable of suitably implementing the method of the present invention.

FIG. 2 is a cross-sectional view showing a height adjusting mechanism portion of a rotary rest in the rolling machine of FIG.

FIG. 3 is a diagram illustrating a reaction force applied from a rotary rest to a rod material in the rolling machine of 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 cross-sectional view showing the vicinity of an outer peripheral portion of the positive feed rod of FIG. 4 in a partially enlarged manner.

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

7 is a diagram showing the measurement results of the height H3 of the spiral ridges and the width W of the smooth surface when the coating device rod of FIG. 6 is rolled while the dimension X of FIG. 1 is changed.

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

FIG. 9 is a diagram illustrating 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 60: Positive feed rod (rod with spiral mountain) 68, 74: Spiral mountain 70, 76: Smooth surface 72: Coating device rod ( (Rod with spiral mountain)

Claims (1)

[Claims] 1. A rod material is pinched between a pair of rolled round dies arranged substantially parallel to each other, and the rod material is rotated around an axis centering on the rotation of the rolled round die. Thus, when a spiral mountain is rolled on the outer peripheral surface of the rod material, a cylindrical rotary member that is rotatably disposed around an axis substantially parallel to the axis of the rod material and supports the rod material. The rod material is pressed against the rest in accordance with the rolling force of the rolling round die, whereby a predetermined smooth surface is formed on the top of the spiral mountain. Production method.