JP2992386B2 - Rollet forming device for shaft material for armature shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knurling device for a shaft material for an armature shaft used in a rotating electric machine such as a motor.

[0002]

2. Description of the Related Art In general,
Among the armature shafts of this type of rotating electric machine, a flange portion is formed at an axially intermediate portion of the shaft material serving as the armature shaft, and further, a smaller diameter than the flange portion is provided between the flange portion and one end of the shaft material. The first shaft portion to which the core plate material is press-fitted is set to the flange portion side, and the second shaft portion to which the commutator is press-fitted and set to a smaller diameter than the first shaft portion is to one end of the shaft material. There is something to form. In manufacturing such an armature shaft, the outer periphery of the first shaft portion is subjected to knurling so that the core plate is securely mounted.

In this case, a second shaft portion having a smaller diameter is inserted into a fixed mold prior to the first shaft portion to be knurled. Since it is necessary to insert the thick first shaft portion thus formed, the diameter of the insertion side of the insertion hole formed on the fixed mold side must be adjusted to the diameter of the first shaft portion. Therefore,
If the length of the second shaft portion is longer than the stroke of the portion to be knurled, a second insertion hole corresponding to the diameter of the second shaft portion is formed at the back of the insertion hole, and the knurling process is started. Initially, knurling can be performed with the tip of the second shaft part fitted and supported in the second insertion hole. On the other hand, as shown in FIG. 8, when the length D of the second shaft portion 9c is shorter than the stroke C of the knurled portion of the first shaft portion 9b, the tip of the second shaft portion 9c is Second insertion hole 1
The knurling must be performed in an unstable loose fitting state before the shaft reaches No. 4, and as a result, there is a problem that it is difficult to knurl the shaft 9 accurately.

Further, a plurality of armature shafts having different lengths of the first shaft portion may be produced due to a difference in output and the like. In such a case, the stroke of the portion to be knurled is adjusted. It is necessary to prepare a plurality of fixed dies one by one, and this is not a disadvantage in that it is disadvantageous in terms of cost, and there is also a problem that replacement work of the fixed dies is troublesome and complicated, and workability is poor.

[0005]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned circumstances and has as its object to provide an apparatus for forming a knurled shaft material for an armature shaft, which can eliminate these disadvantages. A shaft material for an armature shaft, wherein the shaft material has a flange portion formed at an intermediate portion in the axial direction, and has a smaller diameter than the flange portion between the flange portion and one end of the shaft material. A first shaft portion formed on the flange portion side, a second shaft portion having a smaller diameter than the first shaft portion formed on one end side of the shaft member, and a first shaft portion of the shaft member. A knurling forming apparatus for knurling the outer periphery of a shaping material, comprising: a moving die having the other end side of the shaft material flange portion inserted therein and a die surface abutting the flange portion; To face In the configuration using the fixed die having the jing hole, the sizing hole is knurled only on the outer periphery of the first shaft portion from the opening end side without knurling the outer periphery of the second shaft portion. A knurled forming blade formed on the inner peripheral surface with a knurled shaping blade dimensioned as desired, and a state in which the second shaft side end of the first shaft portion is adjacent to the knurled processing portion and reaches the knurled shaping blade. A second shaft support body in which the second shaft section is slidably fitted and supported, and a support guide section for guiding the movement of the second shaft support body in the axial direction of the shaft material. A receiving portion for receiving the moved second shaft portion support, and a knockout pin for extracting the knurled shaft material from the mold; and a second shaft portion supporting the support member guide portion. Body movement stroke and second axis The length of the sum of the fitting stroke of the second shaft portion to the support, is characterized in that set to be longer than the stroke of the site to be Roretsuto processing of the first shaft portion.

According to the present invention, with this configuration, even if the length of the second shaft portion is shorter than the stroke of the portion to be knurled, the knurling can be performed in a centered state. It was done.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is a starter motor,
The starter motor 1 includes an armature shaft 2, a core 3 and a commutator 4 integrally fixed to the armature shaft 2, and a core 3.
And the like, and are formed by members such as a coil 5 wound around the brush, a brush 6 slidably in contact with the commutator 4, a permanent magnet 7, a motor casing 8, and the like.

Reference numeral 9 denotes a shaft member formed by cold forging to form the armature shaft 2.
Has a flange portion 9a formed at an intermediate portion in the axial direction,
Further, between the flange portion 9a and one end of the shaft member, a first shaft portion 9b having a smaller diameter than the flange portion 9a and to which the core member is press-fitted is mounted on the flange portion 9a side.
A second shaft portion 9c which is set to have a smaller diameter than the first shaft portion 9b and to which the commutator 4 is press-fitted is formed at one end side of the shaft member, while the second shaft portion 9c between the flange portion 9a and the other end of the shaft member is provided. Between them, a gear portion 9d connected to the engine side is formed.

Reference numeral 10 denotes a knurling forming device for knurling the outer periphery of the first shaft portion 9b of the shaft member 9. The shaping device 10 comprises an upper movable mold 11
And the lower fixed mold 12. The movable mold 11 is provided with an insertion hole 11 a having an opening on the lower side and a dimension set so that the other end of the shaft member 9 can be inserted therethrough. ing. On the other hand, the fixed die 12 is provided with a sizing hole 12a having an open upper side, and the sizing hole 12a is formed from the opening end side of the outer periphery of the second shaft portion 9c without knurling. A knurled blade 12b sized to knurl only on the outer periphery of the first shaft portion 9b is located below the knurled portion 12c formed on the inner peripheral surface of the knurled portion 12c. A second shaft portion support 12d having a cylindrical shape in which the second shaft portion 9c is slidably fitted and supported on the inner peripheral surface portion with the lower end portion of the single shaft portion 9b reaching the knurled blade 12b; A supporting member guide portion 12e formed to have a larger diameter than the processed portion 12c and movably guiding and supporting the second shaft portion supporting member 12d in the axial direction of the shaft member 9; and a moved second shaft portion supporting member. Receiving 12d Because surface portion 12f and the sizing hole 1 the shaft member 9 Roretsuto processing has been completed
A knockout pin 12g for pulling out from 2a is provided. Further, the support guide 12e
The sum of the moving stroke A of the second shaft portion support 12d with respect to the second shaft portion 9c and the fitting stroke B of the second shaft portion 9c with respect to the second shaft portion support 12d is the portion of the first shaft portion 9b to be knurled. Is set to be longer than the stroke C. The second shaft portion support 12d is supported by the support guide 12e via the ball plunger 13, so that it does not fall naturally.

In the embodiment of the present invention constructed as described above, when the shaft member 9 is subjected to the knurling process using the molding apparatus 10, first, the shaft member 9 is moved from the side of the second shaft portion 9c to the fixed mold 12 in the fixed die 12 side. The shaft 9 is inserted into the sizing hole 12a and set.
2c, and is supported in a two-point support state in which the lower end of the second shaft 9c is fitted and supported on the upper end of the inner peripheral surface of the second shaft support 12d. Become. Next, the movable mold 11 is lowered toward the fixed mold 12. As the movable mold 11 descends, first, the other end side of the shaft member 9 is inserted into the insertion hole 11a. The lower surface of the mold 11 abuts against the flange 9a and presses it downward. As a result, the shaft member 9 is pushed into the sizing hole 12a until the flange portion 9a comes into contact with the upper surface of the fixed die 12, and at this time, the first shaft portion 9b passes through the knurled portion 12c. As a result, a knurl is formed on the outer periphery of the second shaft support 12d. At this time, the lower end of the second shaft support 12d is guided by the support guide 12e and the lower end surface of the second shaft support 12d is received. 12f, the shaft member 9 is moved down together with the shaft member 9 until the second shaft support 12e is restricted, and after the second shaft support 12e is restricted from moving downward, the second shaft support 12e is moved to the inner peripheral surface of the second shaft support 12e. The portion 9c is inserted, whereby the second shaft portion 9c is ironed.

As described above, according to the present invention, the shaft member 9 pushed into the sizing hole 12a is subjected to knurling on the outer periphery of the first shaft portion 9b by the knurling portion 12c. However, in this case, the second shaft portion 9c
Of the shaft member 9 is always supported by the second shaft portion support 12d movable in the axial direction of the shaft member 9. As a result, the knurling can be performed in a stable support state in which the tip of the second shaft 9c is supported by the second shaft support 12d, and the knurling of the first shaft 9b can be performed. Even if the stroke C is the shaft member 9 longer than the length D of the second shaft portion 9c, the shaft member is always stable by avoiding an unstable state where the second shaft portion is not supported as in the related art. As a result, the knurling can be performed in a state in which the knurling can be performed with high accuracy without any runout.

Further, the sum of the moving stroke A of the second shaft portion support 12d with respect to the support body guide portion 12e and the fitting stroke B of the second shaft portion 9c with respect to the second shaft portion support 12d is knurled. Stroke C of the part to be machined
Therefore, even when the knurling process is performed on a plurality of types of shaft members 9 having different strokes at the portion to be knurled,
If the moving stroke A and the fitting stroke B are set so as to correspond to the longest stroke C of the portion to be knurled, a plurality of types of shaft members can be knurled in the stable supporting state by using a single molding device. It can be processed. As a result, as in the prior art, the plurality of fixed dies 1 are adjusted to the stroke of the part to be knurled.
This eliminates the necessity of preparing each of the components 2, thereby greatly contributing to cost reduction. It also eliminates the need for complicated and complicated replacement work of the fixed mold 12, thereby greatly improving workability.

[0013]

[Effects] In summary, since the present invention is constructed as described above, when the shaft material is subjected to the knurling process using the molding apparatus, the shaft material pushed into the sizing hole is subjected to the knurling process. In this case, the outer periphery of the first shaft portion is subjected to knurling. In this case, the second shaft portion is supported by a second shaft portion support whose distal end is moved and guided in the axial direction of the shaft material. Will be fitted and supported. As a result, the knurling can be performed in a stable support state in which the tip of the shaft material is also supported, and the stroke of the portion to be knurled of the first shaft is longer than the length of the second shaft. Even if the material is used, it is possible to reliably prevent the knurling from being performed in an unstable state where the tip of the second shaft portion is not supported as in the related art, and the knurling can be always performed in a stable supporting state. High accuracy without center run-out.

Further, the stroke obtained by adding the moving stroke of the second shaft support to the support guide and the fitting stroke of the second shaft to the second shaft support is the stroke of the portion to be knurled. Even if a plurality of types of shaft members having different strokes at the portions to be knurled are set to be knurled, the knurling is performed in the stable support state. This makes it possible to reliably perform high-precision knurling of a plurality of types of shaft materials using a single molding device. As a result, there is no need to replace the fixed mold corresponding to the stroke of the part to be knurled one by one as in the conventional case, and it is possible to reduce the number of molds and greatly contribute to cost reduction. This eliminates the necessity of replacing the fixed mold and greatly improves workability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a molding device when a shaft material is set.

FIG. 2 is a cross-sectional view of the molding apparatus at the time of completion of knurling.

FIG. 3 is an enlarged view of a main part of FIG. 1;

FIG. 4 is an enlarged view of a main part of FIG. 2;

FIG. 5 is an enlarged cross-sectional view of a main part of the forming apparatus when the shaft material is set in the shaft material having different strokes of the first shaft portion.

FIG. 6 is an enlarged cross-sectional view of a main part of the forming apparatus at the end of knurling of shaft materials having different strokes of a first shaft portion.

FIG. 7 is a sectional front view of a starter motor.

FIG. 8 is an enlarged cross-sectional view of a main part of a molding device when a shaft material is set in a conventional example.

[Explanation of symbols]

2 Armature shaft 9 Shaft material 9a Flange portion 9b First shaft portion 9c Second shaft portion 10 Molding device 11 Moving die 12 Fixed die 12a Sizing hole 12b Loret forming blade 12c Loret forming portion 12d Second shaft support 12e Supporting guide 12f Receiving surface 12g Knockout pin A Moving stroke of second shaft support relative to support guide B Fitting of second shaft to second shaft support Cutaway C stroke

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Iwashita 1-268, Hirosawa-cho, Kiryu-shi, Gunma Mitsuha Electric Works Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) ) B23P 9/02

Claims (1)

(57) [Claims] 1. A shaft material for an armature shaft, wherein the shaft material has a flange portion formed at an intermediate portion in the axial direction, and has a smaller diameter than the flange portion between the flange portion and one end of the shaft material. The first shaft portion to be set is formed on the flange portion side, the second shaft portion set to be smaller in diameter than the first shaft portion is formed on one end side of the shaft member, and the first member of the shaft member A knurling forming apparatus for knurling the outer periphery of a shaft portion, comprising: a moving mold having a shank material flange portion inserted through the other end thereof and a mold surface abutting against the flange portion; In the configuration using a fixed mold having a sizing hole opposed to the mold, the sizing hole is provided with a first shaft from the opening end side thereof without performing knurling of the outer periphery of the second shaft portion. Knurled only on the outer periphery A knurled shaping blade formed on the inner peripheral surface with a knurled shaping blade dimensioned to be worked, and a state in which the second shank side end of the first shaft portion is adjacent to the knurled shaping portion and has reached the knurled shaping blade. A second shaft portion support in which the second shaft portion is slidably fitted and supported, and a support guide portion for moving and guiding the second shaft portion support in the axial direction of the shaft material. A receiving portion for receiving the moved second shaft portion support, and a knockout pin for extracting the knurled shaft material from the mold, further comprising a second shaft portion for the support guide portion. The sum of the moving stroke of the support and the fitting stroke of the second shaft portion to the second shaft portion support is set to be longer than the stroke of the knurled portion of the first shaft portion. Of armature shaft shaft material Retsuto molding apparatus.