JP2009254142A - Stator forming mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a stator forming mold by which a stator which requires no inlay processing after forming the mold can be obtained. <P>SOLUTION: The stator forming mold comprises: a core rod A11, which is in a cylindrical shape and has a first level difference 11a, which fixes an iron core 2 provided with coils 3 at a prescribed position, a first protruding part 11b, which forms the shape of an inlay 6 for a P-side bracket, and a first recessed part 11c, on which a second core rod described below is fitted; a core rod B12, which is in a doughnut shape with inside diameter fitted on the first recessed part 11c and outside diameter part forms the shape of an inlay 7 for an O-side bracket; a lower mold A13, into which the core rod A11 is fitted using the opposite side of the inlay shape for the P-side bracket at the first protruding part 11b of the core rod A11 and which forms the P-side side surface of a stator; a lower mold B14, which is combined with the lower mold A13 and forms the outside circumferential surface of the stator; and an upper mold, which contacts the core rod A11, the core rod B, and the lower mold B14 and forms the O-side side surface of the stator. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stator molding die that is formed by setting an iron core into which a winding is inserted in a die, press-filling and sealing a mold resin.

In a stator that is formed by setting an iron core into which a winding is inserted into a die, press-filling and sealing a mold resin, the conventional stator has an inlay shape for positioning with a bracket, and an upper die and a lower die. Each core was dug into a mold, and a core rod with an iron core was inserted into the mold.
In order to insert the core rod into the lower die, a certain clearance is required between the core rod and the lower die of the die, and for positioning of the upper die and the lower die, a guide pin and A guide bush is used, but a certain clearance is required between the guide pin and the guide bush. Due to these clearances and the processing accuracy of the mold, misalignment occurs between the core bar, upper mold, and lower mold. .
In the conventional molding method, it is difficult to obtain the positional accuracy of the core rod, the upper mold of the mold, and the lower mold of the mold as described above, and the positional accuracy of the stator core and the spigot shape in the stator by molding alone. It was difficult to ensure.
Therefore, conventionally, after the stator is molded, the shape of the spigot for positioning with the bracket is machined to ensure the positional accuracy of the iron core and the spigot shape.

Further, Patent Document 1 discloses that a highly accurate inlay and a forming method thereof can be obtained without performing post-processing for the formation of a motor inlay provided for attaching an accessory such as an encoder or a brake to a bracket of the motor. There was a thing.
Patent Document 1 is a method for forming an inlay of a motor provided for attaching an accessory such as an encoder or a brake to a bracket of a motor. The bracket is made of metal such as aluminum having a plurality of holes, and is attached to the outside of the bracket. The first mold having the ring-shaped groove for forming the inlay is brought into close contact, and the bracket and the second mold for fixing the stator core of the motor at a predetermined position are combined, and the mold resin is formed in the gap between the bracket and the stator core. By filling the portion, the portion where the mold resin is exposed to the outside through the plurality of holes is filled into the groove formed in the first mold to form an inlay.

JP 2005-192334 A

  The above-mentioned Patent Document 1 inserts a stator core with a coil into a mandrel, attaches and positions a bracket, and then pressurizes and seals a mold resin on the first mold and the second mold. The inlay with the bracket of the stator is formed by using the bracket attached to the first mold, and the stator of the stator that forms the inlay shape for positioning with the bracket without using the bracket as a product at the time of molding. There was a problem that it could not be used as a molding method.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a stator molding die and a stator molding method capable of obtaining a stator that does not require inlay processing after molding. To do.

  The stator molding die according to the present invention is such that a core rod for fixing an iron core having a coil mounted thereon in a predetermined position is formed with an inlay shape for a load side bracket and an inlay shape for an anti-load side bracket. It is.

  In the stator molding die according to the present invention, the core rod that fixes the iron core on which the coil is mounted at a predetermined position is formed with an inlay shape for the load side bracket and an inlay shape for the anti-load side bracket. The position accuracy of the iron core and the spigot shape can be easily obtained, and it is not necessary to machine the spigot shape for positioning with the bracket after molding the stator.

Embodiment 1 FIG.
1 is a cross-sectional view of a stator manufactured by a stator molding die according to Embodiment 1 of the present invention. In the figure, 1 is a stator, 2 is an iron core, 3 is a coil, 4 is a mold resin, and 5 is a lead extraction portion. Further, 6 is a P side spigot that fits with a P side (load side) bracket (not shown), and 7 is an O side spigot that fits with an O side (anti-load side) bracket (not shown).

FIG. 2 is a sectional view of a stator molding die according to Embodiment 1 of the present invention. In the figure, reference numeral 11 denotes a cylindrical shape, and a first step 11a for fixing an iron core 2 (not shown) on which a coil 3 is mounted at a predetermined position and a first bracket shape for a P-side bracket 6 are formed. Core rods A and 12 as first core rods having a convex portion 11b and a first concave portion 11c into which a later-described core rod B is fitted, have a donut shape and have an inner diameter fitted into the first concave portion 11c, The outer diameter portion is a core rod B as a second core rod that forms an inlay 7 shape for the O-side bracket.
Reference numeral 13 denotes a first lower mold that fits the core rod A11 in the first convex portion 11b of the core rod A11 using the opposite side of the P-shaped bracket inlay and forms the P side surface of the stator. The lower molds A and 14 are the lower mold B as the second lower mold that forms the outer peripheral surface of the stator, and are fixed in combination with the lower mold A13 to constitute the lower mold.
Reference numeral 15 denotes an upper die that is combined with the core rod A11, the core rod B12, and the lower die B14 to form a mating surface with the anti-load side bracket.
However, the parts that make up the mold include guide bushes, guide pins, locating rings, etc. that align when multiple parts are installed, fastening parts that fix multiple parts, sprue bushes that are resin paths, and product Although there are ejector pins used for taking out, they are omitted in FIG.

3 to 6 are views showing a stator molding process using the stator molding die according to Embodiment 1 of the present invention. In the figure, reference numerals 1 to 15 are the same as those in FIG. 1 and FIG.
A stator molding method according to Embodiment 1 of the present invention will be described with reference to FIGS.
(1) The core 2 with the coil 3 inserted is inserted into the core rod A11 and fixed at the position of the first step 11a. Subsequently, the core rod B is fitted into the first recess 11c of the core rod A11. In this state, an inlay 6 shape for the P side bracket and an inlay 7 shape for the O side bracket are formed by the first convex portion 11b formed on the core rod A11 and the outer diameter portion of the core rod B12. (Figure 3)
Although omitted in FIG. 3, the lead take-out unit 5 is set.
(2) The lower mold A13 into which the core rod A11 is fitted and the lower mold B14 forming the outer peripheral surface of the stator are combined and fixed to constitute the lower mold.
Subsequently, the core side A11 to which the iron core 2 and the core bar B12 are attached is formed on the first convex portion 11b of the core bar A11 using the opposite side of the spigot shape for the P side bracket to form the P side surface of the stator. Fit into the lower mold A13. (Fig. 4)
(3) The upper die 15 that forms the mating surface with the anti-load side bracket is combined with the core rod A11, the core rod B12, and the lower die B and brought into close contact. (Fig. 5)
(4) A gap between the core rod A11, the lower die A13, the lower die B14 and the iron core 2 in which the coil 3 is inserted, the core rod A11, the core rod B12, the lower die B, the upper die 15, and the iron core in which the coil 3 is inserted. 2 is filled with mold resin 4. (Fig. 6)
(5) Using an ejector pin (not shown), take out the stator 1 from the mold. (Figure 1)

  As described above, the positional accuracy of the P-side inlay and the iron core of the stator manufactured by the stator molding method using the stator molding die according to Embodiment 1 of the present invention is the processing accuracy of the core rod A and the core rod. Depends on the assembly accuracy of A and iron core, and the positioning accuracy of the O-side spigot and iron core of the stator is the processing accuracy of core rod A, the processing accuracy of core rod B, the assembly accuracy of core rod A and core, the core rod A Depends on the assembly accuracy of the core rod B, and does not depend on the upper and lower molds of the mold, so the positional accuracy of the inlay and the iron core can be easily obtained, and a stator that does not require inlay processing after molding is obtained. be able to.

  In the stator molding die according to the present invention, the positional accuracy of the spigot and the iron core can be easily obtained, and after the molding, a stator that does not require the spigot process can be obtained, so that automation can be facilitated.

It is sectional drawing of the stator manufactured with the metal mold | die for stator shaping | molding concerning Embodiment 1 of this invention. It is sectional drawing of the metal mold | die for stator shaping | molding concerning Embodiment 1 of this invention. It is a figure which shows the process of a stator using the stator mold concerning Embodiment 1 of this invention. It is a figure which shows the process of a stator using the stator mold concerning Embodiment 1 of this invention. It is a figure which shows the process of a stator using the stator mold concerning Embodiment 1 of this invention. It is a figure which shows the process of a stator using the stator mold concerning Embodiment 1 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Stator, 2 Iron core, 3 Coil, 4 Mold resin, 5 Lead extraction part, 6 P side inlay, 7 O side inlay, 11 Core rod A, 11a 1st level | step difference, 11b 1st convex part, 11c 1st 1st Recess, 12 Core rod B, 13 Lower mold A, 14 Lower mold B, 15 Upper mold.

Claims (2)

  A stator molding die, characterized in that a core rod for fixing an iron core on which a coil is mounted at a predetermined position is formed with an inlay shape for a load side bracket and an inlay shape for an anti-load side bracket. A first step that has a cylindrical shape and fixes an iron core on which a coil is mounted at a predetermined position; a first protrusion that forms an inlay shape for a load-side bracket;
A first core rod having a first recess into which a second core rod to be described later is fitted;
A doughnut-shaped second core rod that has an inner diameter fitted into the first recess, and an outer diameter portion forms an inlay shape for the anti-load side bracket;
A first lower portion forming the load side surface of the stator while fitting the first core rod at the first convex portion of the first core rod using the opposite side of the spigot shape for the load side bracket. Type,
A second lower mold combined with the first lower mold to form an outer peripheral surface of the stator;
An upper die that contacts the first core rod, the second core rod, and the second lower die to form a side opposite to the load of the stator;
A stator molding die characterized by comprising:

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