JPS6091009A - Rotary shaft and its manufacture - Google Patents

Abstract

PURPOSE:To enable a rotary shaft to be manufactured at a low price decreasing its weight and increasing its rigidity, by forming small contour parts by drawing in ends of a main unit part of hollow round bar material and using said small contour parts as a bearing part while its following round bar material main unit part as a shaft main unit part. CONSTITUTION:A rotary shaft 1 forms its central part as shaft main unit part 2 of large contour while its both end parts as a bearing part 3 of small contour. The bearing part 3 is supported by a bearing not shown in the drawing. The shaft main unit part 2 is constituted from a steel pipe used as a hollow round bar material, and its external diameter is almost aligned to an external diameter of the shaft main unit part. The bearing part 3 is formed in a small contour by applying drawing work in both ends of the hollow round bar material. The rotary shaft 1, being constituted from the hollow round bar material, is lighter in weight than that of solid round bar material, while even a wasteful material is not generated because of no necessity for cutting work required to form the small contour part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating shaft including a shaft body and a bearing, and a method for manufacturing the same.

For example, a rotating shaft for conveying copy paper in a copying machine is arranged in a horizontal direction, and the copy paper is fed by a shaft main body section located in the middle thereof.

However, in the conventional rotary shaft for conveying copy paper, the shaft body and the bearing are machined out of a solid round bar material, so there is a waste of material II due to the cutting of the bearing, and the shaft is also heavy. Therefore, in a copy machine that drives a large number of shafts in conjunction with each other, the starting torque of the motor is large, requiring a large motor, and the overall weight is also large.

In order to improve this drawback, it is conceivable to use aluminum or synthetic resin as the material of the rotating shaft, but such materials may cause the rotating shaft to be bent.

Furthermore, as a means of reducing weight while ensuring a certain level of rigidity, the shaft body and bearing are made separate, the shaft body is constructed from a highly rigid steel tube, and the shaft body and bearing are welded together. However, it is not necessarily easy to weld the shaft body and the bearing in a state where they are aligned, and the welded part requires deburring, which increases the cost.

In view of the above points, the present invention is lightweight and has high rigidity by forming a bearing part by drawing the end of a hollow round bar material, and does not require additional balls such as deburring. The present invention provides a rotating shaft that can be manufactured at low cost.

Further, in manufacturing the above-mentioned rotating shaft, the present invention applies a drawing process to the end of the main body portion of the hollow round bar material to form a small diameter portion, and then rotates the hollow nine bar material described in 1-. Either the main body part or the small diameter part is cylindrically ground, and then the cylindrical ωF
By rotating the hollow nine bar material described in 1-1 about the axis of the machined main body part or small diameter part, and in this state, cylindrical grinding the other main body part or small diameter part that has not been subjected to cylindrical grinding,
The present invention provides a method for manufacturing a rotating shaft that can automatically align the axes of the main body portion and the small diameter portion.

The present invention will be explained below with reference to the illustrated embodiments.
In Fig. 2, reference numeral 1 denotes a rotating shaft for conveying copy paper used in a copying machine, and the center portion thereof has a large diameter shaft body portion 2;
Both end portions are small-diameter bearing portions 3. This bearing part 3
is rotatably supported on the machine frame of the copy machine via a bearing (not shown), and the copy paper is sandwiched between the L-marked shaft main body 2 and the shaft main body of another rotating shaft having a similar configuration. It is now possible to transport it. Further, in the illustrated embodiment, a tube 4 made of a heat-shrinkable material is provided on the outer periphery of the shaft body 2 for adsorbing paper dust due to static electricity.

The shaft main body portion 2 of the rotary shaft 1 is made of a steel tube as a hollow round bar material, and the outer diameter of the hollow round bar material is made to substantially match the outer diameter of the shaft main body portion 2. The recording receiving portion 3 is integrally formed with the shaft body portion 2 by drawing both ends of the hollow round bar material described in the description above to form a small diameter at both ends.

Fig. 3 is a process diagram showing the manufacturing process of the rotary shaft 1 described in 2.
A joint m-tube such as TKN-128 is used, and its wall thickness is 1.5 mm in consideration of bending and forming the groove 23 described later.
I am using a thick one. First, 1: Hollow nine stick material 1
o to a length of 400+nm, and then a drawing process is applied to both ends of the cut hollow round bar material 10 to form small diameter portions 11,1.
1 is formed.

In this embodiment, the drawing process consists of four steps, and in the first step, the main body 12 of the hollow round bar material 1o is held by the gripping member 13 within a range of 300 mm, and in this state, the die 14 is used to hold the main body 12 of the hollow round bar material 1o. The outer diameter of the small diameter part 11 is 161111
Drawing processing is applied to make it 1. 2nd process, 3rd
Likewise, dice 15.
By 1B and +7, the outer diameter of small f\tfR11 becomes 12
It is drawn to have a diameter of mm, 9m11, and 8I. Note that annealing is performed after each drawing process.

The hollow round bar material 1o that has been drawn is then cut to a predetermined total length, and then the main body part 12 and the small diameter part 11 are each cylindrical #F cut and centered. . This processing consists of two steps. First, in the first step, the main body 12
Cylindrical grinding is performed.

This cylindrical grinding process is carried out by placing the main body part 12 (-1=) rotatably on a support base 20 in which a V-shaped groove is formed, and using a grinding wheel 2.
1 is brought into contact with one side of the main body 12, and at the same time, a rubber drive wheel 22 is brought into elastic contact with the other side, and the grinding wheel 21 and the drive wheel 22 are rotationally driven by a drive source (not shown), and the drive wheel 22 This is done by rotating the hollow round bar material 10 due to friction with the material.

After the cylindrical grinding of the L-mounted body portion 12 is completed, cylindrical grinding of the small diameter portion 11 is then performed in a second step.

This cylindrical grinding is carried out by bringing the grinding wheel 21 into contact with the small diameter portion 11 on both sides as shown in FIG. It is done by letting At this time, hollow circle#
5 The material IO is rotating around the axis of the main body part 12 that has been ground, and the small diameter part 1 is rotating around the center of rotation.
1, the axis of the small diameter portion 11 is aligned with the main body portion 1.
2, and therefore centering can be performed simultaneously with cylindrical grinding. In addition, support stand 2
Instead of 0, it is also possible to use, for example, two rotatable support shafts arranged in parallel.

After cylindrical grinding and centering have been carried out as described above, next, a groove 23 for fitting a snap ring is formed in one of the small diameter portions 11, and necessary machining such as a hole 24 and a flat surface 25 for centering is performed. administer. After all machining is completed, a surface treatment such as manganese phosphate treatment is applied, and finally the tube 4 made of a heat-shrinkable material such as vinyl chloride is coated on the main body 12 and then The rotating shaft 1 is completed by heating the tube 4 in a furnace or the like to shrink the tube 4 and bring it into close contact with the main body 12.

In this embodiment, since the rotating shaft l is made of a hollow round bar material lO, the heavy sight can be made lighter by about Bθ% compared to a case made of a solid round bar material, and moreover, Sufficient rigidity can be ensured by using a hollow steel pipe or the like as the material for the real round bar. In addition, there is no need for cutting to form the small diameter portion 11, so there is no wastage of material, and the overall length can be extended by drawing the small diameter portion 11, so the length of the hollow round bar material lO indicated by L can be reduced. It can be made shorter than the total length of the finished product, which is also economical.

Further, the main body portion 12 and the small diameter portion 11 can be formed substantially on the same axis by the drawing process, and the cylindrical grinding process performed on each main body portion 12 and the small diameter portion 11 after the drawing process automatically Since it is possible to precisely align the respective axes of the L-mounting body part 2 and the bearing part 3 on the same axis, if the cylindrical grinding process is prepared, there is no need to prepare a special centering process. Therefore, the manufacturing process can be simplified and the manufacturing cost can be reduced. Also, unlike welding, drawing does not cause fringing, so it has the advantage that there is no need to prepare for the edge removal process.

Next, in the above embodiment, when drawing is performed on both ends of the hollow round bar material IO to form the small diameter portion 11.11, the drawing is performed in stages in four steps. By using
1 can also be processed in one step each.

Since FIG. 4 shows such an embodiment, in the same figure, the arcuate die 30 divided into a plurality of parts is rotationally driven by a drive source (not shown), and the hollow round bar material 10 is rotated by a cylinder device 31 etc. It is directed toward the arcuate die 30 by the arrow. Then, when the tip of the hollow round bar material 10 is press-fitted into the shaft of the arc-shaped die 30 and subjected to drawing processing, a small diameter portion 11 is formed at one end of the hollow round bar material 10 in one step. Ru. It is clear that by performing the drawing process on both ends of the hollow round bar material IO in this manner, the hollow round bar material 1O that has undergone the four drawing steps in the above embodiment can be obtained. Note that annealing after drawing can be omitted.

In addition, in the embodiment 1, when performing cylindrical grinding and centering of the main body portion 12 and the small diameter portion 11, the first step and the second step are performed.
The above main body part as well as the process! 2 is rotatably placed on a support base 20 with a V-shaped groove formed therein and driven to rotate by a rubber drive wheel 22. In the second step, the main body portion cylindrically ground in the first step is rotated by a rubber drive wheel 22. It is also clear that similar effects can be obtained by gripping the main body part 12 with a rotatably driven chuck or the like and rotating it around the axis of the main body part 12, and performing cylindrical grinding of the small diameter part 11 in this state. It is.

Further, in the above embodiments, the cylindrical grinding is performed starting from the main body 12, but the order is not necessarily limited to this.

As described above, according to the present invention, it is possible to obtain a rotating shaft that is lightweight and has high rigidity, and in manufacturing it, waste of material can be minimized, and post-processing such as deburring is not required. First, the effect is that the rotating shaft can be manufactured at low cost.

Furthermore, according to the manufacturing method of the present invention, the axes of both parts can be automatically aligned by simply performing cylindrical grinding of the main body part and cylindrical grinding of the small diameter part, so in this respect as well, the rotating shaft can be manufactured at low cost. The effect of being able to do this is obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
3 is a process diagram showing the manufacturing process of the rotating shaft shown in FIGS. 1 and 2, and FIG. 4 is a sectional view of the main part in another embodiment of the present invention. FIG. ■... Rotating shaft 2... Shaft main body part 3... Bearing part 1o... Hollow round bar material 11... Small diameter part 12... Main body part 14-17.3o... Tice 2o... ...Support stand 21
... Grinding wheel 22 ... Drive wheel Fig. 1 Fig. 2

Claims (2)

[Claims] (1) In a rotating shaft that includes a shaft body and a bearing, a small diameter part is formed by drawing at the end of the main body of a hollow round bar material, and the small diameter part is used as the bearing part of the rotating shaft, and this small diameter part 1. A rotating shaft characterized in that the main body of the hollow round bar material as described above is used as the shaft main body of the rotary shaft. (2) After drawing the end of the main body of the hollow round bar material to form a small diameter part, rotate the hollow round bar material.
; Cylindrical grinding is performed on either the main body portion or the small diameter portion, and then the hollow round bar material is rotated around the axis of the cylindrically ground main body portion or the small diameter portion, and cylindrical grinding is performed in this state. 1. A method of manufacturing a rotating shaft, which comprises cylindrical grinding the other main body portion or small diameter portion so that the axes of the main body portion and the small diameter portion coincide with each other.