JP3842200B2 - Adjustable mandrel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adjustable mandrel for positioning a workpiece such as a stator core, which is used, for example, in a core stacking operation in which stator cores of a large motor are aligned and stacked.
[0002]
[Prior art]
Conventionally, a mandrel having a guide portion corresponding to the inner diameter of the stator core has been used in a core stacking operation in which the stator cores of a large motor are aligned and stacked. Moreover, since the inner diameter of the stator iron core is different for each motor model, mandrels having a guide portion having a diameter corresponding to the motor model have been manufactured for all models.
[0003]
For example, as a mandrel used to hold a workpiece with respect to a machine tool, an extended mandrel whose outer diameter can be adjusted by a taper mechanism is known (for example, see Patent Document 1).
[0004]
[Patent Document 1]
[Patent Document 1] Japanese Patent Laid-Open No. 8-187639
[Problems to be solved by the invention]
In the conventional mandrel for core stacking work as described above, since it is necessary to manufacture many types of mandrels, the manufacturing cost is high and a vast storage place is required. In addition, the expandable mandrel using a taper mechanism has a small diameter adjustable range, and it has been difficult to apply it to a workpiece having a different inner diameter for each model, such as a stator core of a large motor.
[0006]
The present invention has been made to solve the above-described problems, and an object thereof is to obtain an adjustable mandrel capable of ensuring a sufficient adjustable range with a simple configuration.
[0007]
[Means for Solving the Problems]
An adjustable mandrel according to the present invention includes a base plate, a support column erected on the base plate, and a top plate supported by the support column and provided with a plurality of pin holes in parallel to the base plate. eccentric member provided between the rotatable base plate and the top plate has a positioning surface for positioning the inner circumference of the work, and a parallel eccentric axes mutually centered, attached to the top plate A plurality of pin housings whose positions with respect to the pin holes can be finely adjusted, and positioning pins that are selectively inserted into the plurality of pin holes via the pin housings and position the eccentric members by contacting the eccentric members, The position of the positioning surface can be adjusted by rotating the eccentric member around the eccentric shaft.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an adjustable mandrel according to an example of an embodiment of the present invention. In the figure, a cylindrical column 2 is erected vertically on the center of a disk-shaped base plate 1. An annular top plate 3 is fixed horizontally at the upper end of the column 2. The base plate 1 and the top plate 3 are arranged in parallel to each other. The support 4 includes a base plate 1, a support column 2, and a top plate 3.
[0009]
Between the base plate 1 and the top plate 3, a plurality of (here, three) eccentric rollers 5 having a columnar (or cylindrical) shape as an eccentric member are arranged. Each eccentric roller 5 is rotatable about eccentric shafts 5a that are parallel and perpendicular to each other. Moreover, the outer peripheral surface of each eccentric roller 5 serves as a positioning surface 5b for positioning the inner peripheral surface of the stator iron core 20 (see FIG. 4), which is a workpiece. The eccentric roller 5 is made of steel, for example, and the positioning surface 5b is subjected to processing for improving wear resistance, for example, chromium plating.
[0010]
The eccentric shaft 5 a is disposed at a position offset from the axis of the eccentric roller 5. Therefore, the position of the positioning surface 5 b can be adjusted in the radial direction of the inner peripheral surface of the stator core 20 by rotating the eccentric roller 5 about the eccentric shaft 5 a.
[0011]
The top plate 3 has a plurality of pin holes 3a. Positioning pins 6 are selectively inserted into the pin holes 3a. The eccentric roller 5 is positioned by bringing the eccentric roller 5 into contact with the positioning pin 6. Further, the positioning pin 6 is inserted into the pin hole 3 a via the pin housing 7 attached to the top plate 3.
[0012]
2 is a plan view showing the positioning pin 6 and the pin housing 7 of FIG. 1, and FIG. 3 is a sectional view taken along the line III-III of FIG. The position of the pin housing 7 with respect to the pin hole 3a can be finely adjusted. An adjustment margin for the position of the pin housing 7 is, for example, about 0.5 mm. The pin housing 7 is fixed to the top plate 3 by tightening a pair of fixing screws 8.
[0013]
In FIG. 1, a lock screw 9 is screwed to the upper end portion of each eccentric shaft 5a. By tightening the lock screw 9, the rotation of the eccentric roller 5 is locked. A key positioning mechanism 10 that is inserted into a slot (groove) of the stator core 20 and positions the stator core 20 in the circumferential direction is attached between the base plate 1 and the top plate 3. The key positioning mechanism 10 is disposed so as not to interfere with the eccentric roller 5.
[0014]
FIG. 4 is a plan view showing the adjustable mandrel of FIG. 1 in more detail. As shown in the figure, the inner peripheral surface (tooth tip) of the stator iron core 20 is in contact with the positioning surfaces 5b (outer peripheral surfaces) of the three eccentric rollers 5 or opposed via a very small gap. The pin hole 3a is arranged according to the motor model. Further, a pin housing 7 finely adjusted corresponding to the actual stator core 20 is attached to each pin hole 3a.
[0015]
The pin housing 7, the fixing screw 8, and the lock screw 9 are disposed in a recess (counterbore) 3 b provided on the top surface of the top plate 3. This prevents the pin housing 7, the fixing screw 8, and the lock screw 9 from protruding upward from the top surface of the top plate 3.
[0016]
Next, a method for using the adjustable mandrel according to this embodiment will be described. First, several stator iron cores 20 are stacked on the base plate 1 with all the eccentric rollers 5 being rotatable. When the thickness of the laminated body of the stator core 20 reaches an appropriate size, all the eccentric rollers 5 are manually rotated, and the positioning surfaces 5b are brought into contact with the inner peripheral surface of the stator core 20, respectively.
[0017]
Thereafter, the pin housing 7 is temporarily fixed to the pin hole 3 a corresponding to the motor model, and the positioning pin 6 is inserted into the pin hole 3 a through the pin housing 7. Then, the positioning pin 6 is brought into contact with the eccentric roller 5 while finely adjusting the position of the pin housing 7.
[0018]
Next, the pin housing 7 is permanently fixed by the fixing screw 8 in a state where the positioning pin 6 is in contact with the eccentric roller 5. Further, the lock screw 9 is tightened on the eccentric shaft 5a to lock the rotation of the eccentric roller 5. After all the eccentric rollers 5 are locked, the remaining stator iron cores 5 are sequentially stacked.
[0019]
When the stator cores 20 of different motor models are stacked, the pin housing 7 is fixed to the pin holes 3a corresponding to the motor models in the same procedure as described above. When the stator core 20 corresponding to the pin housing 7 that has been finely adjusted once is stacked again, the positioning pin 6 is inserted into the pin housing 7, the eccentric roller 5 is brought into contact with the positioning pin 6, and the eccentric roller is in this state. What is necessary is just to lock 5 rotation.
[0020]
That is, as shown in FIG. 4, if the pin housing 7 is finely adjusted with respect to the pin hole 3a corresponding to the stator core 20 of all models, the subsequent fine adjustment of the pin housing 7 is unnecessary, and positioning is performed. The eccentric roller 5 can be positioned by the pin 6.
[0021]
FIG. 5 is a process diagram showing a method of positioning the eccentric roller 5 in the adjustable mandrel with fine adjustment of the pin housing 7. First, as shown in FIG. 5A, the key positioning mechanism 10 is disposed between the base plate 1 and the top plate 3. Next, as shown in FIG. 5B, the key positioning mechanism 10 is fixed to the base plate 1 and the top plate 3 with a plurality of screws 11.
[0022]
Thereafter, as shown in FIG. 5C, the positioning pins 6 are inserted into the three pin housings 7 corresponding to the stator cores 20 to be laminated. Then, as shown in FIG. 5 (d), the three eccentric rollers 5 are rotated and brought into contact with the side surfaces of the positioning pins 6. In this state, as shown in FIG. 5 (e), the lock screw 9 is tightened on the eccentric shaft 5 a to restrict the rotation of the eccentric roller 5. Thereby, the positioning of the eccentric roller 5 is completed, and the stator iron core 20 is laminated.
[0023]
In such an adjustable mandrel, since the position of the positioning surface 5b can be adjusted by rotating the eccentric roller 5 about the eccentric shaft 5a, a sufficient adjustable range is ensured with a simple configuration. be able to. That is, by adjusting the rotation angle of the eccentric roller 5, the diameter of the virtual circle formed by connecting the outermost peripheral points of the three eccentric rollers 5 can be easily and largely adjusted.
[0024]
In addition, since a sufficient adjustable range can be secured with one adjustable mandrel, there is no need to manufacture a dedicated mandrel for each motor model, which can reduce costs and save storage space. .
[0025]
Further, in the fixed mandrel, there is a possibility that problems such as the stator iron core being twisted may occur when the stator iron core after lamination is extracted. On the other hand, according to the adjustable mandrel described above, the eccentric roller 5 can be easily rotated by loosening the lock screw 9 after the stator core 20 is laminated, and between the eccentric roller 5 and the stator core 20. After the sufficient gap is secured, the laminated body of the stator cores 20 can be extracted. Therefore, deformation and damage of the stator iron core 20 can be prevented and workability can be improved.
[0026]
Furthermore, since the individual eccentric rollers 5 are independently rotated, there is no need to perform high-accuracy synchronous operation or high-precision machining on each eccentric roller 5, and the manufacturing cost can be reduced. Can be reduced.
[0027]
Further, since the eccentric roller 5 is positioned by bringing the eccentric roller 5 into contact with the positioning pin 6, the eccentric roller 5 can be easily positioned according to the inner diameter of the stator core 20.
[0028]
Further, since the pin housing 7 attached to the support body and capable of fine adjustment of the position relative to the pin hole 3a is attached to the top plate 3, and the positioning pin 6 is inserted into the pin hole 3a via the pin housing 7, According to the size of the stator core 20, the positioning pin 6 can be arranged at a more accurate position. Further, once the position of the pin housing 7 with respect to the pin hole 3a is finely adjusted, the positioning pin 6 can be easily placed at an accurate position from the second time, and the position reproducibility can be improved. Furthermore, since errors such as the mounting position of the eccentric shaft 5a with respect to the support 4 can be absorbed by the pin housing 7, the manufacturing and assembling accuracy of the parts can be reduced, and the structure can be reduced.
[0029]
Furthermore, since the key positioning mechanism 10 for positioning the stator core 20 in the circumferential direction is attached between the base plate 1 and the top plate 3, the stator core 20 can be more accurately stacked with a simple configuration. it can.
[0030]
Here, FIG. 6 is an explanatory diagram for explaining the adjustable range of the adjustable mandrel of FIG. The thickness t of the cylindrical support column 2 is 10 mm, the maximum diameter φAmax of the virtual circle formed by the three eccentric rollers 5 is 840 mm, 2 × d1 ≧ 80 mm, and the inner diameter φAin of the support column 2 is 250 mm.
d2 + da = 420mm (1)
da−d2 = 135 mm (2)
From formulas (1) and (2), da = 277.5 mm
d1 = 40mm
d2 = 142.5mm
Therefore, dmin = da + d1 = 317.5 mm
φAmin = 635mm
φAmax = 840mm
Therefore, the adjustable range of φA is 635 to 840 mm.
[0031]
Thus, according to the adjustable mandrel as described above, it is possible to cope with a change in the inner diameter of the stator iron core 20 over a wide range of 205 mm. Such an adjustable range can sufficiently cope with various stator iron cores.
[0032]
In the above example, after stacking several actual stator cores 20, the positioning of the eccentric roller 5 and the fine adjustment of the pin housing 7 were performed. However, as shown in FIG. Positioning of the eccentric roller 5 and fine adjustment of the pin housing 7 may be performed using a calibration ring 21 having a corresponding inner diameter.
Further, a spacer or shim 22 having a known dimension may be combined with the calibration ring 21 to perform positioning of the eccentric roller 5 or fine adjustment of the pin housing 7.
[0033]
Furthermore, in the above example, the eccentric roller 5 is shown as the eccentric member, but the shape of the eccentric member is not limited to the roller shape. For example, it may have a sector or semicircular cross section.
[0034]
Furthermore, in the above example, three eccentric rollers 5 are used, but two eccentric members may be used. That is, for example, one of the eccentric rollers 5 in FIG. 1 may be a fixed roller, and the diameter of the virtual circle may be changed by the rotation of the remaining two eccentric rollers 5.
Further, four or more eccentric members may be used.
[0035]
Furthermore, in the above example, the stator core 20 is shown as a workpiece. However, the adjustable mandrel of the present invention can be used for positioning of any other workpiece, and its application is limited to the lamination of the stator core 20. It is not a thing.
[0036]
Furthermore, in the above example, the eccentric roller 5 is positioned by laminating several actual stator iron cores 20 and bringing the eccentric roller 5 into contact with the positioning pins 6. However, the positioning pins and the pin housing 7 are used. First, while the actual stator iron core 20 is being laminated, the eccentric roller 5 is positioned by bringing the eccentric roller 5 into contact with the stator iron core 20, and the rotation of the eccentric roller 5 is locked in this state. The remaining stator core 20 can be laminated.
[0037]
【The invention's effect】
As described above, the adjustable mandrel of the present invention can adjust the position of the positioning surface by rotating the eccentric member around the eccentric shaft. Can be secured.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an adjustable mandrel according to an example of an embodiment of the present invention.
2 is a plan view showing a positioning pin and a pin housing of FIG. 1. FIG.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a plan view showing the adjustable mandrel of FIG. 1 in more detail. FIG.
FIG. 5 is a process diagram showing a method of positioning an eccentric roller in an adjustable mandrel with fine adjustment of the pin housing.
6 is an explanatory diagram for explaining an adjustable range of the adjustable mandrel of FIG. 1; FIG.
7 is a plan view of a principal part showing another example of a method for positioning an eccentric roller of the adjustable mandrel of FIG. 1; FIG.
[Explanation of symbols]
4 support body, 5 eccentric roller, 5a eccentric shaft, 5b positioning surface, 6 positioning pin, 7 pin housing, 10 key positioning mechanism, 20 stator core (workpiece).

Claims (2)

A support body having a base plate, a support column erected on the base plate, and a top plate that is supported by the support column and provided with a plurality of pin holes in parallel to the base plate ;
An eccentric member provided between the base plate and the top plate that has a positioning surface for positioning the inner peripheral surface of the workpiece and is rotatable about eccentric shafts parallel to each other;
A plurality of pin housings attached to the top plate and capable of fine adjustment of positions relative to the pin holes;
A positioning pin that is selectively inserted into the plurality of pin holes through the pin housing and positions the eccentric member by contacting the eccentric member, and rotates the eccentric member around the eccentric shaft. By adjusting the position of the positioning mandrel, the position of the positioning surface can be adjusted. A groove is provided on the inner peripheral surface of the workpiece, and a key positioning mechanism that is inserted into the groove and positions the workpiece in the circumferential direction is attached to the support. The adjustable mandrel of claim 1 .

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