JPS5875445A - Molding dvice for mold of stator of electric rotary machine - Google Patents

Abstract

PURPOSE:To display the effect of rust prevention while omittng a sub-gate and to improve productivity by forming a resin film within a gap between the inside diameter surface of a stator core and a core bar while shaping the exfoliation preventive groove of the film. CONSTITUTION:The gap g' between the inside diameter surface of the stator core 2 and the core bar 15 fitted to the inside diameter surface is formed in size such as 0.05-0.10mm., and a slight draft is shaped toward a nose 16 in the core bar 15. When the plasticorder torque of resin is lowered and fluidity is improved, the flow of resin passes through a spool 9 and a runner 10, and resin is filled into a cope 4 from a gate 18. A drag 11 is filled at the same time as the filling while using the insides of slots and the opening sections 20 of the slots and the gap g' as paths. Accordingly, the effect of rust prevention of the inside diameter surface of the stator core can be displayed, and productivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for molding a coil of a stator of a rotating electric machine.

An upper rotating electric machine in which the stator coil portion is molded with resin has greater advantages within the ring, such as ease of manufacture and ease of processing after winding the stator coil portion.

However, the conventional method has the following disadvantages. This will be briefly explained with reference to FIGS. 1 and 82. In other words, 1 is a stator in which a coil 5 is wound around a stator core 2;
4.11 is a pair of upper and lower molds. The upper mold 4 is provided with an inner wall 6 with a gap from the coil end so that a space 5 surrounding the upper coil end of the stator 1 is created. Further, the lower mold 11 is provided with an inner wall 15 with a gap from the coil end so that a space 12 surrounding the lower coil end of the stator 1 is created. Furthermore, a mandrel 15 is provided in the center of the lower mold 11,
A slight gap g is provided on the inner diameter surface of the stator core 2, and the stator core 2 is fitted into the stator core 2. Further, the upper mold 4 and the lower mold 1F are provided with a sprue 9 and a runner 10 for supplying resin. sub runner 1
7 will be provided. That is, the sprue 9 passes through the upper mold 4 and opens at the end surface 8. The runner 10 is connected to the end face 16 of the mandrel 15.
Several radial pressure relief pipes are provided from the center of the space 5 to reach the space 5 through the gate 18. The sub-runner 17 is formed by a groove on the cylindrical surface of the mandrel 15 along the axial direction of the stator core 2 so as to open toward the inner diameter side of the stator core 2. One end communicates with the runner 1a, and the other end communicates with the runner 1a. enters the space 12 through the gate 19
reach. A plurality of sub-runners 17 are arranged in the same way as the runners 10, avoiding the slots opening on the inner diameter side of the stator core 2.

Next, an example will be described in which the stator 1 configured as described above is molded in a mode V mode using a double-sided molding apparatus. First, both parties [4,
11 and set the stator 1 on the lower mold 11. In this case, the stator core 2 is fitted into the mandrel 15 by providing a gap g on the inner diameter side thereof, and is inserted until the lower end surface of the stator core 2 contacts the upper surface of the lower die 11. Next, press both molds 4.11 until the upper end surface of the stator core 2 hits the lower surface of the upper mold 4.
bring it closer. In this state, an appropriate pressing force is applied between the molds 4 and 11 so that the space 5.12 is sufficiently airtight, and the molds are clamped, and thermosetting resin is injected into the sprue 9 without being heated and pressurized. Then, the resin supplied to the sprue 9 is transferred to the '9ner 10. A mana runner 10 flows into the space 5 through the gate 18. Subrunner 17. The resin flows into the space 12 through the gate 19, filling the space 5.12, permeating the coil S, and stator core 2.
It is also filled into the slots of the stator core 2 and the slight gap g between the slot opening 20 and the mandrel 15 on the inner diameter side of the stator core 2. After the resin has hardened, one mold 4.
Subtract 11! ! - When released, the sprue 9 is removed by the extrusion force of the lower mold 11, and the stator 1 can be removed from the lower mold 11 with the runner 10 and sub-runner 170 portions attached.

However, as post-processing, runner 10. sub runner 1
7 with a knife and the removal of the resin film leaking into the gap on the inner diameter surface of the stator core 2 requires a great deal of time and effort, and there is also the disadvantage that resin is wasted.

Therefore, in view of the above-mentioned drawbacks, the present invention increases the gap between the inner diameter surface of the stator core and the metal core, actively attaches a resin film, and provides grooves to prevent peeling, thereby omitting inner diameter finishing.
, and also has a rust-preventing effect on the inner diameter surface of the stator core.

Furthermore, the purpose of this is to omit the sub-gate, making it economical and improving productivity.

The present invention focuses on the fact that a gap occurs between the inner diameter surface of the stator core and the metal core during molding from the viewpoint of productivity, and proactively attaches a resin film to any leakage to prevent it from being removed. In addition to improving the rust effect, by making the gap larger and providing a groove to prevent peeling, the sub/-) can be omitted.

Embodiments according to the present invention will be described below with reference to FIG. Since the overall structure has already been explained in FIG. 1, the description thereof will be omitted. In this embodiment, the gap r between the inner diameter surface of the stator core 2 and the mandrel 15 that fits therein is α05 to 0. I Q am
The mandrel 15 is provided with a slight draft angle toward the tip 16. For example, if the plastic coder torque of the resin is low and the fluidity is improved, the resin will flow through the sprue 9° runner 10 and fill the upper mold 4 through the gate 18. At the same time, when the lower die 11 is opened, the sprue 9 is removed by the pushing force of the lower die 11, and the runner 10 is attached.The stator 1 is removed from the lower die 11. be able to. The runner 10 attached to the stator 1 can be broken by applying a light blow.
0 describes the radially continuous ν flow side.

In this case, grooves with slopes on both sides so that the opening becomes narrow are provided in the teeth of the inner diameter surface of the stator core 2, and this serves to prevent the resin from peeling off and to serve as a passage for the resin. Middle) to (e) show other examples.

As described above, according to the present invention, the rust prevention effect is achieved by forming a resin film in the gap between the inner diameter surface of the stator core and the mandrel, and furthermore, grooves are provided to prevent peeling of the resin film, and sub-gates are omitted. It is possible to provide an inexpensive molding device for a stator of a rotating electric machine with a flexible structure.

[Brief explanation of the drawings] Figure 1 is a partial cross-sectional view illustrating the structure of a conventional mold forming device. Figure 2 is a runner and fixation of the mold forming device shown in Figure WN2. A cross-sectional view for explaining the positional relationship of the slots of the child core, FIG. 3 is a cross-sectional view for explaining the positional relationship of the slots of the stator core and the runner of a mold forming device according to an embodiment of the present invention, Figure WN4 is a partial cross-sectional view for explaining the structure of a molding device of another embodiment. 1... Stator, 2... Stator core, 3... Coil, 4゜11... Pair of molds, 5.12... Space, 1
5... Core metal, 17... Runner, 1. N□

Claims (1)

[Scope of Claims] t. A device for molding a coil end of a stator in which a coil is housed in a stator core, the inner diameter surface of the stator core and the tip of a mandrel that fits therein are made slightly thinner, A molding device for a stator of a rotating electrical machine, characterized by providing a gap around the entire circumference and forming a resin film on the inner diameter surface of the stator core. 2. A molding device for a stator of a rotating electric machine as set forth in claim 1, characterized in that grooves are provided in the teeth on the inner diameter surface of the stator core to improve the adhesion of the oil film.