JP6071186B2 - Shaft enlargement processing method using shaft enlargement processing equipment - Google Patents

Description

The present invention relates to an axial enlargement processing method for axial enlargement of a workpiece using an axial enlargement processing apparatus that holds both ends of a rod-like workpiece to be axially 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. There is a demand for processing the end portion of the workpiece having the enlarged portion. It is convenient if this end processing can be performed together with the enlarged portion formation.

JP 2008-200757 A

The present invention takes the above-mentioned conventional art into consideration, and performs shaft enlargement processing on a rod-shaped workpiece to form an enlarged portion, and at the same time, a shaft that can also process the end portion of the workpiece. An object is to provide a shaft enlargement processing method using an enlargement processing apparatus .

In order to achieve the above object, the shaft enlargement processing apparatus used in the shaft enlargement processing method of the present invention pressurizes a metal workpiece in a direction of contraction along the axis, and applies an alternating load in a direction intersecting the axis. A shaft enlargement processing sleeve that holds an end of the workpiece when an arbitrary part of the workpiece is enlarged, and the shaft enlargement processing sleeve includes a hole into which the workpiece is inserted, A hole is formed on at least a part of the inner peripheral surface in an arbitrary cross section of the hole with a distance from the opening end of the hole, and is positioned on the inner side of the outer diameter of the workpiece inserted into the hole. Or it includes a plurality of reduced diameter portions.

Before Kichijimi diameter portion, that is intermittently arranged at regular intervals along the inner circumferential direction of the hole.

Further, the axial enlargement processing apparatus, in addition to said axis hypertrophy working sleeve, said workpiece is spaced along the reference line should be arranged with respect to the axis hypertrophy working sleeve, the other end of said workpiece A holding sleeve having a bottom for pressing the workpiece and connected to the holding sleeve, and moving the holding sleeve along the reference line toward the shaft enlargement processing sleeve, A pressurizing means for pressurizing the workpiece between the enlargement processing sleeve and the holding sleeve, and is connected to the axial enlargement processing sleeve, and intersects the axis of the workpiece via the axial enlargement processing sleeve. It has a load supply means for adding the direction of the alternating load on the workpiece.

Axis enlargement processing method using an axial enlargement processing apparatus described above, and held by inserting the other end portion of the workpiece on the holding sleeve is moved along the holding sleeve to said reference line by the pressing means The one end of the workpiece is inserted into the hole of the sleeve for shaft enlargement processing, and the alternating load is applied when the workpiece is further inserted by pressing against the reduced diameter portion in the hole. And forming an end portion to be processed which is complementary to the reduced diameter portion at one end portion of the workpiece, and forming an enlarged portion between the shaft enlargement processing sleeve and the holding sleeve. (Claim 1) .

Preferably, the workpiece is a pipe made of a hollow cylindrical (claim 2).

  According to the present invention, since the reduced diameter portion formed inside the outer diameter of the workpiece inserted into the hole is formed in at least a part of the arbitrary cross section of the hole, this reduced diameter is formed. The end of the workpiece can be processed using the part. Specifically, when the workpiece is inserted into the hole, the end surface of the workpiece hits the reduced diameter portion, and when the workpiece is further pushed, the reduced diameter portion relatively moves along the longitudinal direction of the workpiece. For this reason, the workpiece end portion can be processed by the reduced diameter portion. If the reduced diameter portion is formed in the entire region along the circumferential direction of the inner peripheral surface of the hole portion, the drawing process can be performed to reduce the diameter of the workpiece end portion. If it forms in part, the locus | trajectory of a reduced diameter part can be formed along the longitudinal direction of a workpiece end part. That is, an outer shape having the same shape as the cross-sectional shape of the hole portion in which the reduced diameter portion is formed can be formed at the end portion of the workpiece. By using such a sleeve as a sleeve for shaft enlargement processing, the workpiece can be subjected to shaft enlargement processing to form an enlarged portion, and at the same time, the end portion of the workpiece can be processed. Reduction of man-hours can be realized.

  Further, if the reduced diameter portion is formed intermittently at regular intervals along the inner circumferential direction of the hole portion, a spline shape can be formed at the workpiece end portion. By forming this in the sleeve for shaft enlargement processing, it can be processed efficiently and quickly.

  In particular, the inventors have actually confirmed that spline processing is performed simultaneously with shaft enlargement processing using a pipe having a hollow cylindrical shape as a workpiece. It is very useful to be able to form the enlarged portion and the spline shape at the same time without inserting a mandrel (pin) in the axial center of the pipe. That is, in the present invention, the pipe is held only on the outside. Of course, the present invention can be implemented even if a mandrel is used.

It is the schematic for orderly explaining the axial enlargement processing method of this invention using the axial enlargement processing apparatus typically shown by the sleeve for axial enlargement processing. Axis enlargement processing method according to the present invention by using a shaft enlargement processing apparatus shown as a representative in the axial enlargement processing sleeve is a schematic diagram for explaining sequentially. Axis enlargement processing method according to the present invention by using a shaft enlargement processing apparatus shown as a representative in the axial enlargement processing sleeve is a schematic diagram for explaining sequentially. It is sectional drawing of the sleeve for axial enlargement processing. It is a schematic side view of the workpiece which has the enlarged part formed with the axial enlargement processing method of this invention. It is the schematic of the shaft enlargement processing apparatus used with the shaft enlargement processing method of this invention.

As shown in FIG. 1, the shaft enlargement processing sleeve 1 of the shaft enlargement processing apparatus used in the shaft enlargement processing method of the present invention pressurizes the metal bar workpiece 2 in the direction of contraction along the axis and crosses the axis. When an energy (alternate load) is applied in the direction of enlarging to enlarge any part of the workpiece 2, that is, when forming the enlarged portion 3 (see FIG. 3) on the workpiece 2, the end of the workpiece 2 is held. Is to do. One end of the workpiece 2 is held by the shaft enlargement processing sleeve 1. The other end of the workpiece 2 is held by a holding sleeve 4 having a substantially cylindrical shape. These sleeves 1 and 4 are fixed to holders 12a and 12b, respectively.

  The holding of the workpiece 2 will be described in detail. The sleeves 1 and 4 are formed with holes 5a and 5b. In a state where the other end of the workpiece 2 is inserted and held in the hole 5b of the holding sleeve 4 (the state shown in FIG. 1), the holder 12b is moved in the direction of the opposed holder 12a, and one end of the workpiece 2 is moved. It is inserted and held in the hole 5a (state shown in FIG. 2). Then, normal shaft enlargement processing is performed to form an enlarged portion on the workpiece 2 (state shown in FIG. 3).

  Here, a diameter-reduced portion 13 formed inside the outer diameter of the workpiece 2 inserted into the hole 5a is formed on at least a part of the inner peripheral surface in an arbitrary cross section of the hole 5a. ing. As shown in FIG. 4, the reduced diameter portion 13 in this example is formed intermittently at regular intervals along the inner peripheral direction of the hole 5a.

By inserting the workpiece 2 into the hole 5 a having such a reduced diameter portion 13, the end portion of the workpiece 2 can be processed using the reduced diameter portion 13. Specifically, when the workpiece 2 is inserted into the hole 5 a, the end surface of the workpiece 2 abuts against the reduced diameter portion 13, and is further pushed into the reduced diameter portion 13 along the longitudinal direction of the workpiece 2. Move relatively. For this reason, the end portion of the workpiece 2 can be processed by the reduced diameter portion 13. If the reduced diameter portion 13 is formed intermittently at regular intervals along the inner circumferential direction of the hole portion 5a as shown in FIG. 4, the spline shape 7 (the end portion to be processed) is formed at the end portion of the workpiece 2. Can do. By using such a sleeve 1 as the sleeve 1 for axial enlargement processing, the workpiece 2 is subjected to axial enlargement processing to form the enlarged portion 3, and at the same time, the end portion of the workpiece 2 is processed. Can reduce the number of processing steps.

  In addition, if the reduced diameter part 13 is formed in the whole area along the circumferential direction of the inner peripheral surface of the hole part 5a, the drawing process which reduces the diameter of the end part of the workpiece 2 can be performed. If it forms in part, the locus | trajectory of the reduced diameter part 13 can be formed along the longitudinal direction of the workpiece 2 edge part. That is, an outer shape having the same shape as the cross-sectional shape of the hole 5 a in which the reduced diameter portion 13 is formed can be formed at the end of the workpiece 2. If a plurality of diameter-reduced portions 13 for forming the drawing process as described above are used in combination, spline processing can be performed while forming the outer shape of the end of the workpiece 2 into a desired shape. For example, the entire circumference on the inlet side of the hole portion 5a is made smaller than the diameter of the workpiece 2 to be a first reduced diameter portion, and at the back of the first reduced diameter portion, inside the first reduced diameter portion. 4 is formed as the second reduced diameter portion, the outer diameter of the workpiece 2 is made smaller than the original workpiece 2 (drawing), and the outer shape is splined. Can do.

As shown in FIG. 6, the shaft enlargement processing apparatus 9 using the above-described shaft enlargement processing sleeve 1 includes a pressurizing means 10 and an energy supply means including, for example, a tilting means 11. The sleeves 1 and 4 are disposed at both left and right ends with respect to the workpiece 2 and are disposed along a reference line A where the workpiece 2 is to be disposed. The sleeves 1 and 4 can be brought into contact with and separated from 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 sleeves 1 and 4 hold the workpiece 2 while maintaining a predetermined separation distance.

  The pressurizing means 10 is connected to the holder 12b and pressurizes the holder 12b along the reference line A toward the holder 12a (in the direction of arrow P). As a result, the workpiece 2 is inserted into the hole 5a of the sleeve 1 and is abutted and compressed in the axial direction.

The tilting means 11 is connected to the holder 12a and tilts the sleeve 1 in a direction intersecting the axis of the workpiece 2 (in the direction of arrow T). At this time, the workpiece 2 is also rotated using a rotating means (not shown) for rotating the holder 12a around the reference line A. Such tilting means 11 may be used as the energy (alternate load) supply means, or the holder 12a is swung or swung, or alternately twisted or applied with an alternating impact torque. May be.

  The enlarged portion 3 formed on the workpiece 2 is formed by compressing the workpiece 2 in the axial direction using the pressurizing means 10 and applying energy to an arbitrary position of the workpiece 2 using the tilting means 11. The Simultaneously with this axial enlargement processing, the end portion processing of the workpiece 2 by the reduced diameter portion 13 is performed. Actually, the reduced diameter portion 13 relatively moves along the surface of the workpiece 2 while the workpiece 2 is inserted into the hole 5 a of the sleeve 1 for axial enlargement using the pressurizing means 10. By doing so, the workpiece 2 is plastically flowed for processing. Since the workpiece 2 that has been plastically flowed moves toward the end face, a gap 14 is formed in advance between the holder 12a and the sleeve 1 to allow this. In addition, as shown in FIG. 3, when the pin 15 is provided in the holder 12a and this pin 15 is inserted through the hole 5a, a gap 14 is formed between the pin 15 and the end surface of the workpiece 2.

  In addition, you may use the pipe 6 which consists of a hollow cylindrical shape as the workpiece 2 (refer FIG. 5). The inventors have actually confirmed that the pipe 6 having a hollow cylindrical shape is used as the workpiece 2 and the spline processing is performed simultaneously with the shaft enlargement processing. It is very useful to be able to form the enlarged portion and the spline shape at the same time without inserting a mandrel in the axial center of the pipe 6. That is, in the present invention, only the outside of the workpiece 2 can be held and the shaft enlargement processing can be performed.

DESCRIPTION OF SYMBOLS 1 Axis enlargement processing sleeve 2 Work piece 3 Enlarged part 4 Holding sleeve 5a, 5b Hole part 6 Pipe 7 Spline shape (working edge part)
9 Shaft enlargement processing device 10 Pressurizing means 11 Tilt means ( alternating load supply means)
12a, 12b Holder 13 Reduced diameter portion 14 Clearance 15 Pin

Claims (2)

Pressurizing a metal workpiece in a direction to shrink along the axis, and holding one end of the workpiece when an alternating load is applied in a direction crossing the axis to enlarge any part of the workpiece A sleeve for shaft enlargement processing,
A hole into which the workpiece is inserted;
More than the outer diameter of the one end of the workpiece, which is formed on at least a part of the inner peripheral surface in an arbitrary cross section of the hole at a distance from the opening end of the hole and is inserted into the hole. A shaft enlargement processing sleeve including a plurality of reduced diameter portions positioned on the inner side and intermittently arranged at regular intervals along the inner circumferential direction of the hole portion ,
A holding sleeve having a bottom that is spaced along a reference line on which the workpiece is to be disposed with respect to the sleeve for shaft enlargement processing, holds the other end of the workpiece, and presses the workpiece;
Connected to the holding sleeve, moving the holding sleeve along the reference line toward the shaft enlargement processing sleeve, and pressurizing the workpiece between the shaft enlargement processing sleeve and the holding sleeve Pressurizing means;
Load supply means connected to the shaft enlargement processing sleeve and applying an alternating load in a direction intersecting the axis of the workpiece to the workpiece via the shaft enlargement processing sleeve;
In the shaft enlargement processing method using the shaft enlargement processing apparatus comprising
Insert the other end of the workpiece into the holding sleeve and hold it,
The holding sleeve is moved along the reference line by the pressurizing means, and the one end portion of the workpiece is inserted into the hole portion of the shaft enlargement processing sleeve,
When the one end portion of the workpiece is pressed against the reduced diameter portion and further inserted in the hole portion, the one end of the workpiece is applied by applying the alternating load to the workpiece using the load supply means. A shaft enlargement processing method characterized by forming an end portion to be machined in a shape complementary to the reduced diameter portion and forming an enlarged portion between the shaft enlargement processing sleeve and the holding sleeve . The shaft enlargement processing method according to claim 1 , wherein the workpiece is a pipe having a hollow cylindrical shape.

Images