Side surface shallow pouring device and shallow pouring method for thin-wall product

Abstract

The invention relates to the technical field of thin-wall product casting, in particular to a side surface shallow pouring device and method for a thin-wall product. The side surface shallow pouring device comprises a horizontally arranged cross gate, and thin-wall products to be cast are arranged on the two sides of the cross gate; a glue inlet insert is arranged between the cross gate and the thin-wall product, the side face of the glue inlet insert is in contact with the side wall, close to the cross gate, of the thin-wall product, a through hole is formed in the glue inlet insert, and the cross gate penetrates through the through hole; and a flat ejector pin is arranged at the position, close to the glue inlet insert, below the thin-wall product. According to the invention, insert lines can be prevented from remaining on the surface of the thin-wall product, the problem of poor glue feeding is avoided, and the reject ratio of the product is reduced from 20% to 5%.

Description

Technical Field

[0001] The invention relates to the technical field of thin-wall product casting, and in particular to a side shallow casting device and a shallow casting method for thin-wall products. Background Art

[0002] The injection molding process is a method of injecting liquid into a cavity that is adapted to the shape of the part, and then cooling and solidifying it to obtain parts and blanks. The injection molding process has low production costs and is widely used in machinery manufacturing, aerospace, automobile manufacturing and other fields. However, the defect rate of parts manufactured by the injection molding process is high, especially for some thin-walled parts. For example, the front and back sides of some thin-walled parts are both appearance surfaces, and there cannot be any insert lines and glue inlet marks on their surfaces. However, the traditional injection molding process will leave obvious insert lines on the surface of the product, and the glue inlet will turn white. The overall warping of the product is serious, resulting in the parts being unable to be repaired and a high defective rate.

[0003] Therefore, it is necessary to improve the casting process of thin-walled products. The prior art CN115608923A discloses a casting system design and preparation method for thin-walled castings. According to the theoretical formula, the relationship between the cooling rate of thin-walled castings and the solidification time and the dendrite spacing size is calculated. Combined with the distribution relationship of defects such as microcracks in the original wax casting process according to the size of the thin-walled casting, in the optimized casting system, the bottom of the pouring cup is a plate-shaped straight runner arranged vertically, and the side of the straight runner is vertically arranged with an entgate, one end of the entgate is connected to the straight runner, and the other end of the entgate is connected to the casting. By optimizing the casting system structure and the casting preparation process parameters, the solidification sequence of the casting is improved, the tendency of thermal stress generation is greatly reduced, and the thermal cracks distributed at the cross section of the size mutation can be effectively reduced, which is helpful to improve the qualified rate of castings. The casting system is suitable for the preparation of thin-walled castings, which can significantly improve the quality of castings and greatly improve the qualified rate. However, the appearance quality defects of thin-walled products have not been well improved. Summary of the invention

[0004] In order to solve the above technical problems in the prior art, the present invention provides a side shallow pouring device and a shallow pouring method for thin-walled products.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] On the one hand, the present invention provides a side shallow casting device for thin-walled products, comprising a horizontally arranged cross runner, thin-walled products to be cast are arranged on both sides of the cross runner; a glue inlet insert is arranged between the cross runner and the thin-walled product, the side of the glue inlet insert is in contact with the side wall of the thin-walled product close to the cross runner, a through hole is arranged in the glue inlet insert, and the cross runner passes through the through hole; a flat ejector is arranged below the thin-walled product close to the position of the glue inlet insert.

[0007] Furthermore, the glue inlet insert is arranged obliquely above the side surface which contacts the thin-walled product.

[0008] Furthermore, the angle between the upper part of the side surface of the glue inlet insert that contacts the thin-walled product and the vertical direction is 6°.

[0009] Furthermore, the through hole is flared, and the cross-sectional area of ​​the through hole gradually decreases from the runner toward the thin-walled product; the cross-sectional area of ​​the through hole on the side wall of the glue inlet insert close to the runner is larger than the cross-sectional area of ​​the runner.

[0010] Furthermore, the angle between the upper side wall of the through hole and the horizontal direction is 50°.

[0011] Furthermore, the flat ejector pin comprises an upper half and a lower half, the cross section of the upper half is square, and the cross section of the lower half is circular.

[0012] Furthermore, the side shallow pouring device also includes a runner ejector, an auxiliary runner is arranged below the cross runner, and the runner ejector is arranged below the auxiliary runner.

[0013] Furthermore, the number of the auxiliary runners is 2, and the two auxiliary runners are symmetrically arranged on both sides of the cross runner, and a runner ejector is arranged under each auxiliary runner.

[0014] Furthermore, the diameter of the runner ejector pin is larger than the diameter of the auxiliary runner.

[0015] Furthermore, a straight runner is arranged above the horizontal runner, and the straight runner is connected to the middle position of the horizontal runner.

[0016] On the other hand, the present invention also provides a side shallow pouring method for thin-walled products, comprising:

[0017] S1, casting using the above-mentioned side shallow casting device for thin-walled products;

[0018] S2. After casting is completed, a flat ejector is used to eject the thin-walled product;

[0019] S3. Use the runner ejector to eject the horizontal runner.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a side shallow pouring device and a shallow pouring method for thin-walled products. A runner is arranged on the side of the thin-walled product, and a glue inlet insert is arranged between the runner and the thin-walled product. After casting, the thin-walled product is ejected by a flat ejector pin, and the glue inlet insert will automatically cut off the connection between the runner and the thin-walled product, thereby avoiding residual insert lines on the surface of the thin-walled product, avoiding the problem of poor glue injection, and the filling pressure is small, thereby solving the problem of difficult injection molding of thin-walled products.

[0022] The present invention sets the side of the glue inlet insert that contacts the thin-walled product as an inclined surface, and sets the upper surface of the internal through hole of the glue inlet insert as an inclined surface, so that the glue inlet insert can be smoothly cut when shearing the thin-walled product, and there is no residue at the glue inlet, the product appearance quality is high, and compared with the traditional injection molding process, the product defective rate is reduced from 20% to 5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the side shallow pouring device of the present invention.

[0024] Figure 2 It is a schematic diagram of the internal structure of the glue inlet insert of the present invention.

[0025] Description of reference numerals:

[0026] 1- horizontal runner, 2- thin-walled product, 3- glue inlet insert, 4- flat ejector, 5- runner ejector, 6- auxiliary runner, 7- straight runner. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the protection scope of the present invention.

[0028] It should be noted that, unless otherwise specifically stated, the relative arrangements of components and steps, and numerical expressions set forth in these embodiments should not be construed as limiting the scope of the present invention.

[0029] The following description of the exemplary embodiments is merely illustrative and is not intended to limit the present invention and its application or use in any sense. Techniques, methods and devices known to ordinary technicians in the relevant field may not be discussed in detail here, but where applicable, these techniques, methods and devices should be considered as part of this specification.

[0030] The present invention provides a side shallow pouring device for thin-walled products, such as Figure 1As shown, it includes a horizontally arranged cross runner 1, and thin-walled products 2 to be cast are arranged on both sides of the cross runner 1; if the thin-walled product 2 is a disc product, it is preferred that the protruding part of the thin-walled product 2 is arranged upward, and the injection liquid can be gradually injected inward and upward from the edge of the thin-walled product 2; a glue inlet insert 3 is arranged between the cross runner 1 and the thin-walled product 2, and the side of the glue inlet insert 3 is in contact with the side wall of the thin-walled product 2 close to the cross runner 1, and a through hole is arranged in the glue inlet insert 3, and the cross runner 1 passes through the through hole; a flat ejector pin 4 is arranged below the thin-walled product 2 near the glue inlet insert 3.

[0031] The flat ejector pin 4 includes an upper half and a lower half, wherein the upper half has a square cross section and the lower half has a circular cross section. A truncated cone with a larger diameter is provided at the lower end of the circular lower half, and the truncated cone has a cut edge, which is convenient for installing the flat ejector pin. The truncated cone with a cut edge can prevent the flat ejector pin 4 from rotating after installation.

[0032] The side shallow pouring device also includes a runner ejector 5. An auxiliary runner 6 is arranged below the horizontal runner 1, and the runner ejector 5 is arranged below the auxiliary runner 6. There are two auxiliary runners 6, and two auxiliary runners 6 are symmetrically arranged on both sides of the horizontal runner 1, and a runner ejector 5 is arranged below each auxiliary runner 6.

[0033] The diameter of the runner ejector pin 5 is larger than the diameter of the auxiliary runner.

[0034] A sprue 7 is arranged above the runner 1, and the sprue 7 is connected to the middle of the runner 1. The injection liquid flows into the runner 1 through the sprue 7, and then is injected into the mold through the runner 1.

[0035] The cross section of the glue inlet insert 3 is square, and a boss is provided on the outer side surface (the side away from the thin-walled product) of the lower end of the glue inlet insert 3. Figure 2 As shown, the upper part of the side surface where the glue inlet insert 3 contacts the thin-walled product 2 is inclined. The angle a between the upper part of the side surface where the glue inlet insert 3 contacts the thin-walled product 2 and the vertical direction is 6°.

[0036] The through hole is flared, and the cross-sectional area of ​​the through hole gradually decreases from the runner 1 to the thin-walled product 2; the cross-sectional area of ​​the through hole on the side wall of the injection port insert 3 close to the runner 1 is larger than the cross-sectional area of ​​the runner 1. The angle β between the upper side wall of the through hole and the horizontal direction is 50°.

[0037] The method for shallow pouring using the side shallow pouring device for thin-walled products provided by the present invention comprises:

[0038] S1, casting using the above-mentioned side shallow casting device for thin-walled products;

[0039] S2, after the casting is completed, the thin-walled product 2 is ejected using the flat ejector pin 4;

[0040] S3, using the runner ejector 5 to eject the runner 1.

[0041] Among them, the thin-walled product 2 can be an injection molded part or a metal casting. After casting using the side shallow casting device for thin-walled products provided by the present invention, the thin-walled product 2 is first ejected from bottom to top using the flat ejector pin 4. The connection between the thin-walled product 2 and the runner 1 cannot be moved due to the limitation of the glue inlet insert 3. Therefore, the side wall of the glue inlet insert 3 acts as a knife edge to cut off the thin-walled product 2 from the runner 1. After the thin-walled product 2 is ejected, the runner ejector pin 5 is used to eject the runner 1 from bottom to top. Compared with the traditional injection molding process, the present invention can avoid the problem of poor glue injection and the problem of glue injection insert lines on the product surface. In addition, there is no residue at the glue inlet, the filling pressure is small, and the product can fall off automatically. The present invention can reduce the defective rate from the original 20% to 5%.

[0042] The above specific implementation methods are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A side shallow pouring device for thin-walled products, characterized in that: It comprises a horizontally arranged cross runner, thin-walled products to be cast are arranged on both sides of the cross runner; a glue inlet insert is arranged between the cross runner and the thin-walled product, the side of the glue inlet insert is in contact with the side wall of the thin-walled product close to the cross runner, a through hole is arranged in the glue inlet insert, and the cross runner passes through the through hole; a flat ejector is arranged below the thin-walled product close to the glue inlet insert.

2. The side shallow pouring device according to claim 1, characterized in that: The glue inlet insert is arranged obliquely above the side surface that contacts the thin-walled product.

3. The side shallow pouring device according to claim 2, characterized in that: The angle between the upper part of the side surface of the glue inlet insert that contacts the thin-walled product and the vertical direction is 6°.

4. The side shallow pouring device according to claim 1, characterized in that: The through hole is flared, and the cross-sectional area of ​​the through hole gradually decreases from the runner toward the thin-walled product; the cross-sectional area of ​​the through hole on the side wall of the glue inlet insert close to the runner is larger than the cross-sectional area of ​​the runner.

5. The side shallow pouring device according to claim 4, characterized in that: The angle between the upper side wall of the through hole and the horizontal direction is 50°.

6. The side shallow pouring device according to claim 1, characterized in that: The side shallow pouring device also includes a runner ejector pin. An auxiliary runner is arranged below the horizontal runner, and the runner ejector pin is arranged below the auxiliary runner.

7. The side shallow pouring device according to claim 6, characterized in that: The number of the auxiliary runners is 2, and the two auxiliary runners are symmetrically arranged on both sides of the cross runner, and a runner ejector is arranged under each auxiliary runner.

8. The side shallow pouring device according to claim 7, characterized in that: The diameter of the runner ejector pin is larger than the diameter of the auxiliary runner.

9. The side shallow pouring device according to claim 1, characterized in that: A straight runner is arranged above the horizontal runner, and the straight runner is connected to the middle position of the horizontal runner.

10. A side shallow pouring method for thin-walled products, characterized in that: include: S1. Casting using the side shallow casting device for thin-walled products as described in any one of claims 6 to 8; S2. After casting is completed, a flat ejector is used to eject the thin-walled product; S3. Use the runner ejector to eject the horizontal runner.

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