TWI795924B - Manufacturing method of laminated iron core - Google Patents

Abstract

A method for manufacturing a laminated iron core, comprising a pre-step, a stacking step, a coating step, a heating step, a pressing step, and a separation step. The pre-step is to prepare several base materials with two coating layers. In the stacking step, the base materials are stacked on the mold to form several structural parts. In the coating step, a release agent layer is coated between the structural parts. The heating step is to heat the structural parts to form a semi-finished product. The release agent layer is heated to form an isolation film that is not bonded to the paint layers. The pressing step is to apply stamping force to consolidate the semi-finished product into a laminated iron core. In this separation step, the laminated iron cores are taken out from the mold to obtain several finished products. The isolation film can reduce the deformation problem caused by stress concentration, so as to improve the yield of the manufacturing process.

Description

Manufacturing method of laminated iron core

The invention relates to a manufacturing method, in particular to a manufacturing method of a laminated iron core.

Referring to Fig. 1, 2, illustrate the manufacturing method of a kind of existing iron core, be applicable to making several iron cores 8 simultaneously, each iron core 8 comprises a plurality of self-adhesive steel sheets 81, the manufacturing method of this iron core comprises a preparation Step S1, a lamination step S2, a pressing step S3, and a separation step S4. In the preparation step S1, the self-adhesive steel sheets 81 are provided, and each self-adhesive steel sheet 81 has two adhesive coatings located on opposite sides on the surface. In the stacking step S2, first set the number of self-adhesive steel sheets 81 to be stacked for each iron core 8 and then start stacking, and whenever the stacked quantity of these self-adhesive steel sheets 81 reaches the When the stacking quantity of the core 8 is preset, a separator 7 will be placed on the self-adhesive steel sheet 81 located at the top. In the pressing step S3, the self-adhesive steel sheets 81 are pressurized and heated to form the stacked iron core 8 . Finally, the separation step S4 is to apply an external force to separate every pair of iron cores 8 adjacent up and down, so as to produce a plurality of iron cores 8 .

Wherein, the separator 7 includes a first surface 71 for contacting the lowermost self-adhesive steel sheet 81 of each iron core 8, a second surface 72 on the opposite side, and several The two surfaces 72 are used to contact the protrusion 73 of the uppermost self-adhesive steel sheet 81 of each iron core 8 . The contact area between every pair of up and down adjacent iron cores 8 can be reduced by the protruding parts 73, so as to reduce the adhesion between the iron cores 8, which is beneficial to alleviate the separation process in the separation step S4. External force is applied so that the iron core 8 can have better quality after separation.

However, in the pressing step S3 , a stamping force is provided to press the self-adhesive steel sheets 81 , so as to improve the structural strength of each iron core 8 . But because these protrusions 73 of the separator 7 are arranged in the manner of multi-point spaced distribution, each iron core 8 is positioned at the self-adhesive steel sheet 81 at the top, so in the process of pressing, it is easy to Stress concentrates on the contact portion between the protrusions 73 of each separator 7 and the uppermost self-adhesive steel sheet 81, which may even deform and damage each iron core 8, resulting in an unnecessary increase in production cost. The manufacturing method of the existing iron core still needs to be improved.

Therefore, it is an object of the present invention to provide a method of manufacturing a laminated iron core capable of reducing defective production.

Therefore, the manufacturing method of the laminated iron core of the present invention includes a pre-step, a stacking step, a coating step, a heating step, a pressing step, and a separation step.

The preceding step is to prepare several base materials with two surfaces located on opposite sides respectively, and apply two coating layers on the surfaces of each base material respectively.

In the stacking step, the stacking quantity of a plurality of base materials to be stacked to form a structural part is firstly set, and accordingly the base materials are stacked in a mold to form several structural parts.

In the coating step, a release agent layer is evenly coated between the adjacent coating layers of the structural parts.

The heating step is to heat the structural parts to make the coating layers viscous and position the parent materials of each structural part to form a semi-finished product, wherein the release agent layer will form a molded part when heated. These paint layers are not bonded to each other but interposed between adjacent semi-finished products.

The pressing step is to apply a stamping force to the semi-finished products, so that the parent materials of each semi-finished product are consolidated to form individual laminated iron cores.

In the separating step, the laminated iron cores are sequentially taken out from the mold to obtain several finished products.

The effect of the present invention lies in that the release agent layer can be evenly attached between the structural members, and after heat treatment, the isolation film with the characteristics of large bearing area and uniform thickness can be formed. Prevent the semi-finished products from being difficult to separate between the semi-finished products. When the semi-finished products are stamped by the stamping force, the deformation problem caused by stress concentration can be avoided, and the production yield of the subsequent process can be improved to overcome The above known problems.

Referring to Fig. 3, it is an embodiment of the manufacturing method of the laminated iron core of the present invention, this embodiment includes a pre-step 101, a stacking step 102, a coating step 103, a heating step 104, a pressing step 105, And a separation step 106. It should be explained first that in this embodiment, the case of using several self-adhesive steel sheets to manufacture the laminated iron core in a punching equipment is taken as an example for illustration.

Referring to Figures 4 and 5 and in conjunction with Figure 3, the pre-step 101 is to cut the raw material 1 into several base materials 11 with two surfaces 111 respectively located on opposite sides with a cutting machine, and in each base material The surfaces 111 of 11 are respectively coated with two coating layers 12, wherein each coating layer 12 is composed of epoxy resin, acrylic resin or polyester resin. Specifically, each base material 11 is a self-adhesive steel sheet, and each paint layer 12 is an example of epoxy resin, but it is not limited thereto.

The stacking step 102 is to first set the number of stacks for stacking a plurality of the base materials 11 to form a structural member 31, and accordingly stack the base materials 11 in a mold 2 to form a plurality of structural members 31 (Only one is shown in FIG. 5). In this embodiment, a positioning member 22 and a sensor 21 are provided inside the mold 2. The positioning member 22 is a stopper arranged at the bottom of the mold 2 and provides a limiting force so that the base materials 11 It can be stably stacked in the mold 2 without displacement or even dislocation in subsequent processing. The sensor 21 is an optical range finder, which is mainly used to detect the stacking height H of the base materials 11 , so as to facilitate the subsequent implementation of the coating step 103 .

It should be noted that the mold 2 is preferably a Made of engineering plastics, ceramics, or Teflon.

Referring to Fig. 6, 7 and cooperate Fig. 3, this coating step 103 is to utilize a spraying tool 4 to evenly coat a release agent layer 5 between the adjacent paint layers 12 of these structures 31, and the spraying tool 4 The sensor 21 is connected with information to facilitate judging whether the stacking quantity of the base materials 11 is correct. When the stacking quantity of these base materials 11 reaches the preset height H of each structural member 31, the sensor 21 will send a control signal to the spraying tool 4, so that the spraying tool 4 will carry out the next structure The first base material 11 of the stacking step 102 of the piece 31, and the surface of the base material 11 facing the lower coating layer 12 is sprayed with the release agent layer 5, so that the release agent layer 5 can be uniform attached. Wherein, the release agent layer 5 is one of them selected from complex base grease or lithium complex base grease, and the release agent layer 5 is preferably an example of lithium complex base grease, but not limited by the above .

In the heating step 104 , heat treatment is performed on the structural components 31 by using an induction coil surrounding the mold 2 and adopting cycle heating. The heating principle is to generate an induced current by electrifying the induction coil, and make the induced current pass through the structural parts 31 to generate heat energy, thereby generating a heating effect. Among them, the coating layers 12 will be viscous by heat treatment, so that the parent materials 11 of each structural member 31 are bonded and positioned to form a semi-finished product 32 (shown in FIG. 8 ), and the release agent The layer 5 is heated to form a separation film 51 that is not bonded to the paint layers 12 and is interposed between the adjacent semi-finished products 32 . In this embodiment, the heating temperature ranges from 70°C to 350°C, and the heating frequency ranges from 0.1kHz to 1kHz.

Referring to Figures 8 and 9 in conjunction with Figure 3, in the pressing step 105, a pressing member 6 is molded with the mold 2, and the pressing member 6 will apply a downward punch to the semi-finished products 32. The pressure makes the base materials 11 of each semi-finished product 32 have good compactness, so as to form individual laminated iron cores 91 . During this process, because the isolation film 51 has the characteristics of uniform thickness and large bearing area, the stress acting on the isolation film 51 can be effectively dispersed, so that the semi-finished products 32 can be pressed together. In step 105 , the deformation or damage of the semi-finished products 32 due to stress concentration can be avoided.

In the separation step 106, after confirming that the semi-finished products 32 are pressurized and made into the laminated iron cores 91, the pressing member 6 is removed so that the pressing force disappears and the induction coil no longer generates Thermal energy to prevent overheating and overpressurization. Secondly, the separation film 51 has a release function to reduce the adhesive force between the adjacent laminated iron cores 91, so that the operator only needs to remove the laminated iron cores 91 from the mold 2 one by one. After taking out, several finished products 92 can be obtained without applying additional external force to separate the adjacent laminated iron cores 91 . It should be noted that the isolation film 51 also has the function of anti-corrosion, and can protect the finished product from rusting.

To sum up, the manufacturing method of the laminated iron core of the present invention can form a structure with a large bearing area and a uniform thickness by first separating the upper and lower adjacent structural members 31 by the release agent layer 5 , and after heat treatment. The characteristic of the isolation film 51 makes it difficult for the semi-finished products 32 to be deformed or damaged due to stress concentration during the pressing process. In addition, the separation film 51 can reduce the adhesive force between the adjacent laminated iron cores 91 , so that the laminated iron cores 91 can be easily separated into the finished products 92 . Therefore, can really reach the purpose of the present invention.

But what is described above is only an embodiment of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

101: Pre-steps 102:Stacking steps 103: Coating step 104: heating step 105: Pressing step 106: Separation step 1: raw material 11: Base material 111: surface 12: Paint layer 2: Mold 21: Sensor 22: Positioning parts 31: Structural parts 32: Semi-finished products 4: Spraying tools 5: Release agent layer 51: isolation film 6: Pressure parts 91:Laminated iron core 92: Finished product H: height

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein: Fig. 1 is a block flow chart, illustrates an existing a kind of iron core manufacturing method; Fig. 2 is a side view, illustrating the connection relationship between two adjacent iron cores up and down and a spacer; Fig. 3 is a block flow chart illustrating an embodiment of the manufacturing method of the laminated iron core of the present invention; Fig. 4 is a flow diagram illustrating the operation flow of one of the pre-steps of this embodiment; Fig. 5 is a schematic diagram illustrating the operation status of one of the stacking steps of this embodiment; Fig. 6 is a schematic diagram illustrating the interlocking relationship between a sensor, a spraying tool and the height set by each structural member in a coating step of this embodiment; Fig. 7 is a schematic diagram illustrating the operating state of one of the heating steps of this embodiment; Fig. 8 is a schematic diagram illustrating the working state of one pressing step of this embodiment; and Fig. 9 is a flow diagram illustrating the operation flow of one of the separation steps in this embodiment.

101: Pre-steps

102:Stacking steps

103: Coating step

104: heating step

105: Pressing step

106: Separation step

Claims (3)

A method for manufacturing a laminated iron core, comprising: a preliminary step of preparing several base materials with two surfaces on opposite sides, and coating two paint layers on the surfaces of each base material; a stacking step , setting the number of stacks to make a plurality of base materials stacked on each other to form a structural member, and accordingly stacking the base materials in a mold to form several structural members; a coating step, in the structure A release agent layer is evenly coated between the adjacent paint layers of the parts, wherein the release agent layer is selected from one of complex base grease or lithium complex base grease; a heating step is carried out on these structural parts heating to make the paint layers viscous and position the parent materials of each structural part to form a semi-finished product. a separating film between adjacent semi-finished products; a pressing step, applying a stamping force to the semi-finished products to consolidate the base metals of each semi-finished product to form individual laminated cores; and a separating step, The laminated iron cores are sequentially taken out from the mold to obtain several finished products. The method for manufacturing a laminated iron core as claimed in Claim 1, wherein the heating temperature range of the heating step is between 70° C. and 350° C., and the heating frequency is between 0.1 kHz and 1 kHz. The method for manufacturing a laminated iron core according to claim 1, wherein each coating layer is composed of epoxy resin, acrylic resin or polyester resin.

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