Core product and method of manufacturing core product

1. A core product comprising a first core block and a second core block,

wherein the first core block includes:

a first block body including a first end surface, a second end surface, and a first resin injection portion extending from the first end surface to the second end surface;

a first solidified resin provided in the first resin injection portion; and

a first gate mark integrated with the first solidified resin and protruding outward more than the first end surface,

wherein the second core block includes:

a second block body including a third end surface, a fourth end surface, and a second resin injection portion extending from the third end surface to the fourth end surface;

a second solidified resin provided in the second resin injection portion; and

a second gate mark integrated with the second solidified resin and protruding outward more than the fourth end surface, and

wherein the first core block and the second core block are stacked such that the second end surface and the third end surface face each other.

2. The core product according to claim 1 , further comprising a shaft inserted in a first shaft hole provided in the first block body and a second shaft hole provided in the second block body.

3. The core product according to claim 2 ,

wherein a circumferential edge of the first shaft hole includes a first burr protruding in a first direction from the first end surface to the second end surface, and

wherein a circumferential edge of the second shaft hole includes a second burr protruding in a second direction from the third end surface to the fourth end surface.

4. The core product according to claim 1 ,

wherein the first core block further includes a first identification code storing individual information of the first core block,

wherein the second core block further includes a second identification code storing individual information of the second core block, and

wherein the first identification code and the second identification code are formed on the first end surface and the fourth end surface, respectively, or on the second end surface and the third end surface, respectively.

5. A method of manufacturing a core product, the method comprising:

forming a first core block by injecting a molten resin into a first resin injection portion extending from a first end surface to a second end surface of a first block body, such that a first solidified resin is provided in the first resin injection portion and that a first gate mark is integrated with the first solidified resin and protrudes outward more than the first end surface;

forming a second core block by injecting a molten resin into a second resin injection portion extending from a third end surface to a fourth end surface of a second block body, such that a second solidified resin is provided in the second resin injection portion and that a second gate mark is integrated with the second solidified resin and protrudes outward more than the fourth end surface; and

stacking the first core block and the second core block such that the second end surface and the third end surface face each other.

6. The method according to claim 5 , further comprising inserting a shaft into a first shaft hole provided in the first block body and a second shaft hole provided in the second block body,

wherein a circumferential edge of the first shaft hole includes a first burr protruding in a first direction from the first end surface to the second end surface,

wherein a circumferential edge of the second shaft hole includes a second burr protruding in a second direction from the third end surface to the fourth end surface, and

wherein inserting the shaft includes inserting the shaft into the first shaft hole and the second shaft hole such that an insertion direction of the shaft coincides with the first direction and the second direction.

7. The method according to claim 5 , further comprising:

detecting which of the first end surface and the second end surface faces up, in order to identify a posture of the first block body, before forming the first core block; and

detecting which of the third end surface and the fourth end surface faces up, in order to identify a posture of the second block body, before forming the second core block.

8. The method according to claim 5 , further comprising:

forming a first identification code storing individual information of the first core block on either one of the first end surface and the second end surface; and

forming a second identification code storing individual information of the second core block on either one of the third end surface and the fourth end surface,

wherein stacking the first core block and the second core block includes:

stacking the first core block and the second core block such that the second end surface and the third end surface face each other, the first identification code being formed on the first end surface, the second identification code being formed on the fourth end surface; or

stacking the first core block and the second core block such that the second end surface and the third end surface face each other, the first identification code being formed on the second end surface, the second identification code being formed on the third end surface.

9. The method according to claim 5 ,

wherein forming the first core block includes injecting a molten resin into the first resin injection portion from above in a state in which the first end surface faces up, and

wherein forming the second core block includes injecting a molten resin into the second resin injection portion from above in a state in which the fourth end surface faces up.

10. The method according to claim 5 , wherein

forming the first core block includes injecting a molten resin into the first resin injection portion from below in a state in which the first end surface faces down, and

forming the second core block includes injecting a molten resin into the second resin injection portion from below in a state in which the fourth end surface faces down.