Rotor core lamination die and lamination method

Abstract

The present invention discloses a rotor core lamination die, comprising a base, several equal-height blocks, a triangular core column, a fixed inner mold, two movable inner molds and two movable inner mold transverse movement mechanisms, wherein the fixed inner mold and the two movable inner molds are respectively fixed to the longitudinal center of the corresponding side surfaces of the triangular core column by several spaced-apart fastening screws; the movable inner mold transverse movement mechanisms are respectively arranged on the top of the triangular core column and the top of the adjacent movable inner mold, and between the movable inner mold and the adjacent side surfaces of the triangular core column. When laminating the rotor core, the inner holes of the upper and lower laminating rotor cores abut against the outer edges of the fixed inner mold and the two movable inner molds. The lamination method of the present invention comprises 1) assembling the rotor core lamination die, 2) laminating the rotor core, and 3) pulling up the movable inner mold to complete the demoulding of the rotor core. The present invention facilitates the demoulding of the rotor core and significantly improves the lamination efficiency and lamination quality of the rotor core.

Description

Technical Field

[0001] The invention relates to a laminating die for a motor rotor, in particular to a laminating die and a method for positioning with an inner hole of a rotor iron core, and belongs to the technical field of motor manufacturing. Background Art

[0002] The positioning methods of the motor core (stator core and rotor core) lamination mold can be divided into two methods: inner hole positioning and core outer circle positioning. Most rotor cores are generally laminated by inner hole positioning, which can ensure the accuracy requirements of the inner hole of the rotor core after lamination. In order to ensure the accuracy requirements of the inner hole of the rotor core, the matching clearance between the inner core of the fixed structure lamination mold and the inner hole of the core punching sheet is small, making it difficult to demold the inner hole of the rotor core after lamination. If an elastic demolding mechanism is set in the lamination mold and the elastic force is used to force demolding, the inner hole of the rotor core will be damaged, which will seriously affect the manufacturing quality of the motor core. Summary of the invention

[0003] The purpose of the present invention is to provide a rotor core lamination die and a lamination method to improve the lamination quality of the rotor core.

[0004] The present invention is achieved through the following technical solutions:

[0005] A rotor core lamination die comprises a base, several equal-height blocks, a triangular core column, a fixed inner mold, two movable inner molds and two movable inner mold transverse movement mechanisms, wherein the several equal-height blocks are arranged along the circumference of the base and are respectively fixed on the outer edges of the upper side surfaces of the base, and the lower ends of the positioning rods are respectively fixed on the equal-height blocks; the triangular core column is vertically fixed to the center of the base, and the fixed inner mold and the two movable inner molds are respectively fixed to the longitudinal centers of the corresponding sides of the triangular core column by several spaced-apart fastening screws; the movable inner mold transverse movement mechanisms are respectively arranged on the top end of the triangular core column and the top end of the adjacent movable inner mold, as well as between the movable inner mold and the adjacent side surfaces of the triangular core column; when laminating the rotor core, the inner holes of the rotor cores laminarly stacked up and down abut against the outer edges of the fixed inner mold and the two movable inner molds.

[0006] The purpose of the present invention can be further achieved by the following technical measures.

[0007] Furthermore, the shapes of the fixed inner mold and the two movable inner molds are both a combination of an arcuate body and a rectangular parallelepiped, and the outer arc surface of the arcuate body faces the inner hole of the rotor core and is consistent with the inner hole of the rotor core.

[0008] Furthermore, one ends of a plurality of positioning pins are inserted at intervals into the two longitudinal sides of the fixed inner mold or the two longitudinal sides of the movable inner mold fixed on the corresponding side surfaces of the triangular core column.

[0009] Furthermore, the movable inner mold transverse movement mechanism includes a right-angle support and a coupling structure, the coupling structure is arranged between the movable inner mold and the corresponding triangular core column side, the lower end of the vertical part of the right-angle support is respectively fixed on the top of the movable inner mold, and the lifting screws are respectively passed through the horizontal part of the right-angle support and screwed into the top of the movable inner mold.

[0010] Further, the coupling structure includes three steps that are gradually retracted and have increasing lengths on one side of the movable inner mold, namely, the upper step of the movable inner mold, the middle step of the movable inner mold, and the lower step of the movable inner mold, and three steps that are gradually convex and have decreasing lengths on the side of the triangular core column adjacent to the movable inner mold, namely, the upper step of the triangular core column, the middle step of the triangular core column, and the lower step of the triangular core column; two adjacent step surfaces intersect at an oblique angle α; the three steps of the movable inner mold and the three steps of the triangular core column are inverted; during the lamination process of the rotor core punching sheet, the upper end of the upper step of the movable inner mold and the upper end of the upper step of the triangular core column, the lower end of the middle step of the movable inner mold and the upper end of the middle step of the triangular core column, and the lower end of the lower step of the movable inner mold and the lower step of the triangular core column respectively abut against each other; there are step surface gaps A between the middle step of the movable inner mold and the upper step of the triangular core column, and between the lower step of the movable inner mold and the middle step of the triangular core column. The step surface gap A=1.5~2.5mm.

[0011] Furthermore, the top of the upper step of the triangular core column adjacent to the movable inner mold and the bottom of the lower step of the movable inner mold are respectively provided with an end bevel angle α1, and the end bevel angle α1 matches the bevel angle α between two adjacent step surfaces. The bevel angle α or the end bevel angle α1 is 28° to 32°.

[0012] A lamination method for a rotor core lamination mold comprises the following steps:

[0013] 1) First, fix the fixed inner mold and the two movable inner molds on the longitudinal center of the side of the triangular core column by fastening screws, and then install positioning pins at intervals on both sides of the fixed inner mold and the two movable inner molds to position the fixed inner mold and the two movable inner molds on both sides horizontally;

[0014] Next, the lower stop at the center of the bottom of the triangular core column is positioned and fixed in the central countersunk hole of the base, and the lower end of the positioning rod is fixed on the equal height block, and then the assembly of the positioning rod and the equal height block is arranged along the circumference of the base and fixed on the outer edge of the upper side of the base respectively;

[0015] Finally, fix the lower ends of the vertical parts of the right-angled supports to the top of the movable inner molds, and screw the lifting screws downward through the horizontal parts of the right-angled supports into the tops of the corresponding movable inner molds to complete the assembly of the rotor core lamination mold.

[0016] 2) Put the rotor core punching sheets one by one on the outer edge of the fixed inner mold and the outer edges of the two movable inner molds, so that the outer edge of the fixed inner mold and the outer edges of the two movable inner molds respectively abut against the corresponding positions of the inner holes of the rotor core punching sheets; during the stacking process of the rotor core punching sheets, the rotor core slot shape is arranged by the positioning rod; during the stacking height of the rotor core punching sheets, when the stacking height of the rotor core punching sheets reaches the position of the fastening screws used to fix the movable inner mold and the triangular core column, the fastening screws at this position are removed; when the stacking of the rotor core punching sheets is completed, all the fastening screws used to fix the movable inner mold and the triangular core column have been removed;

[0017] 3) Use a wrench to turn the lifting screws respectively. The lifting screws pull the corresponding movable inner mold upward, and the upper step of the movable inner mold moves upward and slides over the end bevel angle α1 of the upper step of the triangular core column and then moves horizontally toward the triangular core column. The step surface gap A is eliminated, and the middle step of the movable inner mold abuts on the upper step of the triangular core column, and the lower step of the movable inner mold abuts on the middle step of the triangular core column; at this time, the outer arc surface of the movable inner mold is out of contact with the inner hole of the rotor core; the crane can lift the rotor core, thereby completing the demoulding of the rotor core.

[0018] The stacking mold of the present invention adopts a coupling structure in which the three steps of the movable inner mold and the three steps of the triangular core column are inverted with each other. The lifting screw pulls the movable inner mold upward and then the movable inner mold can move laterally, thereby eliminating the step surface gap between the adjacent steps of the movable inner mold and the triangular core column, so that the outer arc surface of the movable inner mold is out of contact with the inner hole of the rotor core and a gap is generated. The inner hole of the rotor core will not be damaged at all, so that the stacked rotor core can be quickly and smoothly lifted out, the rotor core is easy to demold, and the stacking efficiency and stacking quality of the rotor core are significantly improved.

[0019] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of a rotor core lamination die of the present invention;

[0021] Figure 2 yes Figure 1 A top view of

[0022] Figure 3 yes Figure 1 An enlarged view of part I showing a step surface gap A between the top of the movable inner mold and the top of the triangular core column;

[0023] Figure 4 yes Figure 1 An enlarged view of part II showing a step surface gap A between the middle of the movable inner mold and the middle of the triangular core column;

[0024] Figure 5 Yes Yes Figure 1 An enlarged view of part III showing that there is a step surface gap A between the lower part of the movable inner mold and the lower part of the triangular core column;

[0025] Figure 6 yes Figure 1 An enlarged view of part I of the gap A without a step surface between the top of the movable inner mold and the top of the triangular core column after the top of the movable inner mold moves upward and horizontally. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1 and Figure 2 As shown, the rotor core lamination mold of this embodiment includes a base 1, 7 equal-height blocks 2, a triangular core column 3, a fixed inner mold 4, two movable inner molds 5 and two movable inner mold transverse movement mechanisms 6, wherein the five equal-height blocks 2 are evenly distributed along the circumference of the base 1, and the other two are symmetrically arranged at Figure 2 On both sides of the center line of the middle base 1, seven equal height blocks 2 are fixed to the outer edges of the upper side of the base 1 by fasteners. The lower ends of the positioning rods 7 used to calibrate the slot type of the rotor core 10 are fixed to the equal height blocks 2. The lower stop 34 at the bottom center of the triangular core column 3 is positioned and fixed in the central countersunk hole 11 of the base 1. The fixed inner mold 4 and the two movable inner molds 5 are fixed to the longitudinal center of the corresponding side of the triangular core column 3 by five spaced fastening screws 54.

[0028] One end of a plurality of positioning pins 8 are inserted at intervals into the longitudinal sides of the fixed inner mold 4 or the longitudinal sides of the movable inner mold 5 fixed on the corresponding side surfaces of the triangular core column 3 to accurately position the fixed inner mold 4 and the two movable inner molds 5 in the lateral direction.

[0029] The fixed inner mold 4 and the two movable inner molds 5 are both in the shape of a combination of an arcuate body and a rectangular parallelepiped. The outer arc surface 54 of the arcuate body faces the inner hole 101 of the rotor core punching sheet and coincides with the inner hole 101 of the rotor core punching sheet, thereby improving the lamination quality of the rotor core 10.

[0030] The movable inner mold transverse movement mechanism 6 is respectively arranged on the top of the triangular core column 3 and the top of the adjacent movable inner mold 5, and between the movable inner mold 5 and the side of the adjacent triangular core column 3. The movable inner mold transverse movement mechanism 6 includes a right-angle support 61 and a coupling structure 62, the coupling structure 62 is arranged between the movable inner mold 5 and the corresponding side of the triangular core column 3, the lower end of the vertical part 611 of the right-angle support 61 is fixed to the top of the movable inner mold 5 by screws 34, and the lifting screws 62 pass through the horizontal part 612 of the right-angle support 61 and are screwed into the top of the movable inner mold 5.

[0031] The coupling structure 62 includes three steps that are gradually inwardly contracted and increased in length on one side of the movable inner mold 5, namely, the upper step 51 of the movable inner mold, the middle step 52 of the movable inner mold, and the lower step 53 of the movable inner mold, and three steps that are gradually convex and decreased in length on the side of the triangular core column 3 adjacent to the movable inner mold 5, namely, the upper step 31 of the triangular core column, the middle step 32 of the triangular core column, and the lower step 33 of the triangular core column. Two adjacent step surfaces intersect at an oblique angle α, and at the same time, the top end of the upper step 31 of the triangular core column adjacent to the movable inner mold 5 and the bottom end of the lower step 53 of the movable inner mold are respectively provided with an end oblique angle α1, and the end oblique angle α1 matches the oblique angle α between the two adjacent step surfaces. The oblique angle α or the end oblique angle α1 of this embodiment is 30°. The 30° bevel angle α or the end bevel angle α1 allows the movable inner mold 5 to move relatively smoothly between the step surface of the movable inner mold and the step surface of the triangular core column in contact with it during the ascending and lateral sliding process, without any collision or impact between the two, thereby improving the stability and reliability of the use of the rotor core lamination mold.

[0032] like Figure 3 to Figure 5 As shown, the three steps of the movable inner mold 5 and the three steps of the triangular core column 3 are inverted with each other. During the lamination process of the rotor core punching sheets, the upper step 51 of the movable inner mold and the upper end of the upper step 31 of the triangular core column, the lower end of the middle step 52 of the movable inner mold and the upper end of the middle step 32 of the triangular core column, and the lower end of the lower step 53 of the movable inner mold and the lower step 33 of the triangular core column respectively abut against each other. There are step surface gaps A between the middle step 52 of the movable inner mold and the upper step 31 of the triangular core column, and between the lower step 53 of the movable inner mold and the middle step 32 of the triangular core column. The step surface gap A in this embodiment is 2 mm. The step surface gap A can enable the fixed inner mold 4 and the two movable inner molds 5 to abut against each other when the rotor core is stacked, so that the inner hole 101 of the rotor core and the outer edges of the fixed inner mold 4 and the outer edges of the two movable inner molds 5 can be in contact with each other. After the movable inner mold 5 slides horizontally to eliminate the step surface gap A, a gap is generated between the outer arc surface 54 of the movable inner mold 5 and the inner hole 101 of the rotor core, so that the rotor core 10 can be lifted smoothly, thereby improving the stacking quality and stacking efficiency of the rotor core and solving the problem of difficulty in demolding the rotor core after stacking.

[0033] A lamination method for a rotor core lamination mold comprises the following steps:

[0034] 1) First, fix the fixed inner mold 4 and the two movable inner molds 5 on the longitudinal center of the side of the triangular core column 3 by fastening screws 54, and then install positioning pins 8 at intervals on both sides of the fixed inner mold 4 and both sides of the two movable inner molds 5 to position the fixed inner mold 4 and the two movable inner molds 5 on both sides in the lateral direction.

[0035] Next, the lower stop 34 at the bottom center of the triangular core column 3 is positioned and fixed in the central countersunk hole 11 of the base 1 by means of screws 36, and then the lower end of the positioning rod 7 is fixed on the equal height block 2. Then, the assembly of the positioning rod 7 and the equal height block 2 is arranged circumferentially along the base 1 and fixed to the outer edge of the upper side of the base 1 by means of tightening screws 37 respectively.

[0036] Finally, fix the lower end of the vertical portion 611 of the right-angle support 61 to the top of the movable inner mold 5 through the upper screws 35, and screw the lifting screws 62 downward through the horizontal portion 612 of the right-angle support 61 into the corresponding top of the movable inner mold 5 to complete the assembly of the rotor core lamination mold.

[0037] 2) Put the rotor core punching sheets one by one on the outer edge of the fixed inner mold 4 and the outer edges of the two movable inner molds 5, so that the outer edges of the fixed inner mold 4 and the outer edges of the two movable inner molds 5 are respectively against the corresponding positions of the inner holes of the rotor core punching sheets. During the stacking process of the rotor core punching sheets, the rotor core slot type is arranged by the positioning rod 7. During the process of the stacking height of the rotor core punching sheets rising, when the stacking height of the rotor core punching sheets reaches the position of the fastening screws 54 used to fix the movable inner mold 5 and the triangular core column 3, the fastening screws 54 at this position are removed. When the stacking of the rotor core punching sheets is completed, all the fastening screws 54 used to fix the movable inner mold 5 and the triangular core column 3 have been removed.

[0038] 3) Use a wrench to turn the lifting screws 62 respectively, and the lifting screws 62 pull the corresponding movable inner mold 5 upward, and the upper step 51 of the movable inner mold moves upward and slides over the end bevel angle α1 of the upper step 31 of the triangular core column, and then moves horizontally toward the triangular core column 3, and the step surface gap A is eliminated. The middle step 52 of the movable inner mold abuts on the upper step 31 of the triangular core column, and the lower step 53 of the movable inner mold abuts on the middle step 32 of the triangular core column. At this time, the outer arc surface 54 of the movable inner mold 5 is out of contact with the inner hole 101 of the rotor core. The crane can lift the rotor core 10, thereby completing the demoulding of the rotor core 10.

[0039] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A rotor core lamination die, comprising a base and a plurality of equal-height blocks, wherein the plurality of equal-height blocks are arranged along the circumference of the base and are respectively fixed on the outer edge of the upper side of the base; characterized in that: The movable inner mold transverse movement mechanism is respectively arranged on the top of the triangular core column and the top of the adjacent movable inner mold, as well as between the movable inner mold and the adjacent side of the triangular core column; the movable inner mold transverse movement mechanism comprises a right-angle support and a coupling structure, the coupling structure is arranged between the movable inner mold and the corresponding side of the triangular core column, the lower ends of the vertical parts of the right-angle support are respectively fixed on the top of the movable inner mold, and the lifting screws are respectively screwed into the top of the movable inner mold through the horizontal part of the right-angle support; the coupling structure comprises three steps which are gradually retracted and increase in length and are arranged on one side of the movable inner mold, and are respectively the upper steps of the movable inner mold and the lower ends of the vertical parts of the right-angle support. , a middle step of the movable inner mold and a lower step of the movable inner mold, and three steps that are gradually convex and have decreasing lengths on the side of the triangular core column adjacent to the movable inner mold, namely, an upper step of the triangular core column, a middle step of the triangular core column and a lower step of the triangular core column; two adjacent step surfaces intersect at an oblique angle α; the three steps of the movable inner mold and the three steps of the triangular core column are inverted with each other; in the process of stacking the rotor core punching sheets, the upper end of the upper step of the movable inner mold and the upper end of the upper step of the triangular core column, the lower end of the middle step of the movable inner mold and the upper end of the middle step of the triangular core column, the lower end of the lower step of the movable inner mold and the lower step of the triangular core column respectively abut against each other; there are step surface gaps A between the middle step of the movable inner mold and the upper step of the triangular core column, and between the lower step of the movable inner mold and the middle step of the triangular core column; when stacking the rotor core, the inner hole of the stacked rotor core abuts against the outer edge of the fixed inner mold and the outer edges of the two movable inner molds.

2. The rotor core lamination die according to claim 1, characterized in that: The shapes of the fixed inner mold and the two movable inner molds are both a combination of an arcuate body and a rectangular parallelepiped, and the outer arc surface of the arcuate body faces the inner hole of the rotor core and coincides with the inner hole of the rotor core.

3. The rotor core lamination die according to claim 1, characterized in that: One ends of a plurality of positioning pins are inserted into two longitudinal sides of the fixed inner mold or two longitudinal sides of the movable inner mold fixed on the corresponding side surfaces of the triangular core column at intervals.

4. The rotor core lamination die according to claim 1, characterized in that: The step surface gap A=1.5-2.5mm.

5. The rotor core lamination die according to claim 1, characterized in that: The top end of the upper step of the triangular core column adjacent to the movable inner mold and the bottom end of the lower step of the movable inner mold are respectively provided with an end bevel angle α1, and the end bevel angle α1 matches the bevel angle α between two adjacent step surfaces.

6. The rotor core lamination die according to claim 5, characterized in that: The bevel angle α or the end bevel angle α1 is 28° to 32°.

7. A lamination method of a rotor core lamination die according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) First, fix the fixed inner mold and the two movable inner molds on the longitudinal center of the side of the triangular core column by fastening screws, and then install positioning pins at intervals on both sides of the fixed inner mold and the two movable inner molds to position the fixed inner mold and the two movable inner molds on both sides in the horizontal direction; Next, the lower stop at the center of the bottom of the triangular core column is positioned and fixed in the central countersunk hole of the base, and then the equal height blocks are arranged along the circumference of the base and fixed on the outer edges of the upper side of the base respectively; Finally, fix the lower ends of the vertical parts of the right-angled supports to the top of the movable inner molds, and screw the lifting screws downward through the horizontal parts of the right-angled supports into the tops of the corresponding movable inner molds to complete the assembly of the rotor core lamination mold; 2) The rotor core punching sheets are put on the outer edges of the fixed inner mold and the two movable inner molds one by one, so that the outer edges of the fixed inner mold and the two movable inner molds are respectively against the corresponding positions of the inner holes of the rotor core punching sheets; in the process of the stacking height of the rotor core punching sheets rising, when the stacking height of the rotor core punching sheets reaches the position of the fastening screws used to fix the movable inner mold and the triangular core column, the fastening screws at this position are removed; when the stacking of the rotor core punching sheets is completed, all the fastening screws used to fix the movable inner mold and the triangular core column have been removed; 3) Use a wrench to turn the lifting screws respectively. The lifting screws pull the corresponding movable inner mold upward, and the upper step of the movable inner mold moves upward and slides over the end bevel angle α1 of the upper step of the triangular core column and then moves horizontally toward the triangular core column. The step surface gap A is eliminated, and the middle step of the movable inner mold abuts on the upper step of the triangular core column, and the lower step of the movable inner mold abuts on the middle step of the triangular core column; at this time, the outer arc surface of the movable inner mold is out of contact with the inner hole of the rotor core; the crane can lift the rotor core, thereby completing the demolding of the rotor core.

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