JP5977530B2 - Shaft holding unit used for shaft enlargement processing, shaft enlargement processing device, and shaft enlargement processing method using the same - Google Patents

Description

  The present invention relates to a shaft holding unit, a shaft enlargement processing apparatus, and a shaft enlargement processing method using the same, which are used for shaft enlargement processing for holding both ends of a rod-shaped workpiece to be shaft enlarged.

  A shaft enlargement processing machine is described in Patent Document 1. With this shaft enlargement processing machine, a rod-like workpiece having an enlarged portion can be obtained. Since the enlarged portion is formed integrally with the workpiece, it is very convenient for manufacturing various shaft parts.

  The shaft enlargement processing using the shaft enlargement processing machine is performed by holding both ends of the shaft with sleeves and tilting while rotating one sleeve while compressing the shaft. At this time, excessive Hertz stress is generated at the contact point between the shaft and the tip of the sleeve, and the sleeve may be damaged from the tip. If the sleeve breaks, it is necessary to replace the entire sleeve, which is disadvantageous in terms of cost.

JP 2008-200757 A

  The present invention is based on the above prior art, and is used for shaft enlargement processing that suppresses damage to the sleeve, extends the life of the sleeve, reduces replacement work, and reduces material costs for replacement. An object is to provide a shaft holding unit, a shaft enlargement processing apparatus, and a shaft enlargement processing method using the same.

In order to achieve the above object, in the present invention, when a metal workpiece is pressurized in a direction to shrink along an axis and energy is applied in a direction crossing the axis to enlarge any part of the workpiece. A shaft holding unit used for shaft enlargement processing for holding an end of the workpiece, the spindle having a substantially cylindrical shape, a first sleeve having a substantially cylindrical shape inserted and fixed in the spindle, A flange pipe having a flange that is in contact with the front end surface of the first sleeve and fixed to the front end surface of the spindle, and is arranged in a press-fit state in the flange pipe, and in cooperation with the first sleeve Provided is a shaft holding unit used for shaft enlargement processing, comprising a second sleeve that forms a hole through which a workpiece is inserted.

  Moreover, in this invention, it has a pair of axis | shaft holding units used for the shaft enlargement process arrange | positioned along the reference line where the said workpiece should be arrange | positioned, and is connected to one axis | shaft holding unit, and said one axis | shaft holding unit And pressurizing means that pressurizes the other shaft holding unit along the reference line and the other shaft holding unit, and energy is applied to the other shaft holding unit in a direction intersecting the axis of the workpiece. There is provided an axial enlargement processing device characterized by comprising an energy supply means for applying the.

  Furthermore, in the present invention, there is provided a shaft enlargement processing method using the shaft enlargement processing apparatus according to claim 2, wherein both ends of the workpiece are respectively held by a pair of shaft holding units, and the one of the ones is held by the pressurizing unit. The shaft holding unit is moved along the reference line to compress the workpiece in the axial direction, and the other shaft holding unit is tilted using the energy supply means to form an enlarged portion on the workpiece. A shaft enlargement processing method is provided.

  According to the present invention, the shaft holding unit includes the second sleeve press-fitted into the flange pipe. Therefore, even if the shaft holding unit is repeatedly used for shaft enlargement processing, damage to the sleeve is suppressed, and the life of the sleeve is extended. Thus, the replacement work can be reduced and the material cost for replacement can be reduced.

It is the schematic when a workpiece is hold | maintained with the axis | shaft holding | maintenance unit used for the shaft enlargement process which concerns on this invention. It is the schematic of the shaft enlargement processing apparatus which concerns on this invention. It is a graph which shows the relationship between the stress concerning a sleeve, and the distance from a spindle center to radial direction.

  A pair of shaft holding units 1a and 1b according to the present invention is provided for the shaft enlargement processing device 9 (see FIG. 2). One of the shaft holding units 1a and 1b is formed as a pressure side shaft holding unit 1a and the other as a bending side shaft holding unit 1b. The shaft enlargement processing device 9 having such shaft holding units 1a and 1b pressurizes the workpiece 2 made of a metal bar in a direction of contracting along the axis, and applies energy in a direction intersecting the axis to add the workpiece 2 It is intended to enlarge any part of. The shaft holding units 1 a and 1 b are for holding both ends of the workpiece 2 when the enlarged portion is formed on the workpiece 2. These units 1a and 1b are fixed to holders 12a and 12b, respectively (see FIG. 2).

  The shaft holding units 1 a and 1 b have a substantially cylindrical spindle 3. A first sleeve 6 is mounted in the spindle 3 via a sleeve collar 4. The sleeve collar 4 is abutted against a step 15 formed in the spindle 3 and its position is fixed. When the opposite side of the shaft holding units 1 a and 1 b is the front end, the front end surface of the first sleeve 6 is in contact with the rear end surface of the flange pipe 7. The flange pipe 7 has a flange 8 on its tip side. The flange pipe 7 is fixed to the front end of the spindle 3 with a bolt 13 via the flange 8. As a result, the first sleeve 6 is pressed by the flange pipe 7 and fixed in the spindle 3. More specifically, a step 14 is formed on the inner wall of the sleeve collar 4, and a thick boss 16 formed on the outer periphery of the first sleeve 6 abuts the step 14. And the position of the 1st sleeve 6 is being fixed because the front end surface of the 1st sleeve 6 is pressed down by the flange pipe 7. As shown in FIG.

  A second sleeve 17 is press-fitted inside the flange pipe 7. The first and second sleeves 6 and 17 cooperate to form a hole 18 into which the workpiece 2 is to be inserted. An abutment 19 is fitted in the hole 18, and a knock pin 21 is disposed on the rear side of the abutment 19. The rear end of the knock pin 21 is fixed in the spindle 3 by the base 22.

  As shown in FIG. 2, the shaft enlargement processing apparatus 9 using the shaft enlargement processing sleeve 1 according to the present invention includes a pressurizing means 10 and an energy supply means including, for example, a tilting means 11. A pair of shaft holding units 1a and 1b are arranged at the left and right ends with respect to the workpiece 2, and are arranged along a reference line A where the workpiece 2 is to be arranged. The shaft holding units 1a and 1b can be brought into and out of contact with each other along the reference line A by guide means (not shown). The workpiece 2 is held in a state where a portion to be enlarged is exposed. That is, the shaft holding units 1a and 1b hold the workpiece 2 while maintaining a predetermined separation distance.

  The pressurizing means 10 is connected to the shaft holding unit 1a through the holder 12a, and pressurizes the holder 12a along the reference line A toward the holder 12b (arrow P direction). As a result, the workpiece 2 is inserted into the hole 18 of the shaft holding unit 1b and is abutted and compressed in the axial direction.

  The tilting means 11 is connected to the shaft holding unit 1b via the holder 12b, and tilts the shaft holding unit 1b in a direction crossing the axis of the workpiece 2 (arrow T direction). At this time, the workpiece 2 is rotated also using a rotating means (not shown) for rotating the holder 12b around the reference line A. As the energy supply means, such tilting means 11 may be used, or the holder 12a may be swung or swung, or alternately twisted or applied with alternating impact torque.

  Since the shaft holding units 1a and 1b according to the present invention are used in the shaft enlargement processing apparatus 9 as described above, the shaft holding units 1a and 1b include the second sleeve 17 press-fitted into the flange pipe 7. Even if it is repeatedly used for shaft enlargement processing, damage to the sleeve 17 can be suppressed, the life of the sleeve 17 can be extended, and replacement work can be reduced and material costs for replacement can be reduced. In particular, when the shaft enlargement process is performed, when the tilting means 11 is tilted, an excessive Hertz stress is generated at the tip of the sleeve 17. Due to this stress, the workpiece 2 inside the sleeve 17 stretches outward and pushes the sleeve 17 out. However, since the second sleeve 17 is press-fitted into the flange pipe 7, the sleeve 17 is compressed from the outside. It will be. Accordingly, the force applied to the outer side of the compressed workpiece 2 is canceled out, so that the sleeve 17 can be prevented from being damaged. Further, even if the sleeve 17 is damaged due to excessive use, only the sleeve 17 needs to be replaced, which contributes to a reduction in material costs. In this way, by providing two types of sleeves (first sleeve 6 and second sleeve 17) in the spindle 3, the labor and cost of replacement are reduced.

  Furthermore, the present invention is not a simple double sleeve concept, and two types of sleeves are provided in consideration of the fact that excessive stress is applied only to the sleeve tip side, which is a problem peculiar to the shaft enlargement processing device. The sleeve 17 is press-fitted into the flange pipe 7. Therefore, only the sleeve 17 needs to be press-fitted. However, in the shaft enlargement processing apparatus, the outer diameter and inner diameter of the spindle 3 are determined by the design of the apparatus, and the outer diameter of the workpiece 2 is also determined. Is restricted, and the compression force when the sleeve 17 is press-fitted is also determined. When it is desired to add more compressive force, the size of the spindle 3 cannot be changed. Therefore, in order to increase the compressive force at the time of press-fitting, a sleeve having a large outer diameter cannot be added. Therefore, paying attention to the flange pipe 7 for pressing the sleeve, the flange pipe 7 was used as an outer cylinder for press-fitting the second sleeve 17. As a result, the sleeve structure most suitable for the shaft enlargement processing apparatus could be formed without any restriction on the inner diameter of the spindle 3.

  As shown in FIG. 3, the shaft holding units 1 a and 1 b according to the present invention indicated by a solid line B are indicated by a dotted line C indicating a shaft holding unit having a double sleeve structure press-fitted into an outer cylinder having an inner diameter of the spindle 3. It can be seen that the tensile stress represented by the circumferential stress σθ applied to the sleeve is lower than that indicated by the alternate long and short dash line D indicating the shaft holding unit of the conventional single sleeve structure. In particular, in the range of the distance from the inner diameter r0 to the inner diameter r1 in contact with the workpiece 2, the stress reduction when using the shaft holding unit according to the present invention is remarkable. Thus, the inventors have confirmed that mounting the second sleeve 17 press-fitted into the tip of the spindle 3 reduces the stress applied thereto and extends the life of the sleeve.

1a Pressure side shaft holding unit 1b Bending side shaft holding unit 2 Work piece 3 Spindle 4 Sleeve collar 6 First sleeve 7 Flange pipe 8 Flange 9 Shaft enlargement processing device 10 Pressure means 11 Tilt means (energy supply means)
12a, 12b Holder 13 Bolt 14 Step 15 Step 16 Boss 17 Second sleeve 18 Hole portion 19 Gold 21 Knock pin 22 Base

Claims (3)

A shaft for holding an end of the workpiece when pressurizing a metal workpiece in a direction of contraction along the axis and enlarging an arbitrary part of the workpiece by applying energy in a direction intersecting the axis. A shaft holding unit used for enlargement processing,
A substantially cylindrical spindle;
A substantially cylindrical first sleeve inserted and fixed in the spindle;
A flange pipe having a flange abutting on the front end surface of the first sleeve and fixed to the front end surface of the spindle;
For shaft enlargement processing, comprising: a second sleeve which is disposed in the flange pipe in a press-fit state and forms a hole through which the workpiece is inserted in cooperation with the first sleeve. The shaft holding unit used. A pair of shaft holding units used for shaft enlargement processing according to claim 1, wherein the workpiece is disposed along a reference line on which the workpiece is to be disposed,
A pressurizing means connected to one of the shaft holding units and pressurizing the one shaft holding unit toward the other shaft holding unit along the reference line;
An apparatus for enlarging a shaft, comprising: energy supply means connected to the other shaft holding unit and applying energy to the other shaft holding unit in a direction intersecting the axis of the workpiece. A shaft enlargement processing method using the shaft enlargement processing device according to claim 2,
Holding both ends of the workpiece with a pair of shaft holding units,
Moving the one shaft holding unit along the reference line by the pressurizing means to compress the workpiece in the axial direction;
A shaft enlargement processing method, wherein the enlargement portion is formed on the workpiece by tilting the other shaft holding unit using the energy supply means.

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