Burial injection molding method for metal part

Abstract

The invention provides a metal part buried injection molding method which comprises the following steps: a metal part providing step: providing a metal part with the thickness of 0.5-0.7 mm; a roughness increasing step: corroding the surface of the metal piece by using a chemical agent so as to increase the roughness of the surface of the metal piece; a high-temperature pretreatment step: putting the metal piece after the roughness is increased into a heating device, and heating the metal piece to 130-140 DEG C; in the mold entering step, the heated metal part is embedded into a mold and continues to be heated, and the temperature of the metal part is kept at 130-140 DEG C; a buried injection step: carrying out injection molding on the metal piece at 130-140 DEG C to combine the plastic with the metal piece to form a finished product; and a pretreatment deformation step: taking out the finished product from the mold, drying the finished product, clamping the dried finished product on a jig, heating the finished product to enable the finished product to be in an environment of 110-130 DEG C, maintaining for 3-4 hours, and then cooling at normal temperature.

Description

TECHNICAL FIELD

[0001] The present invention relates to a metal piece processing method, in particular to a metal piece insert molding method. BACKGROUND

[0002] Generally, the thickness of metal pieces of metal processing products, such as notebook computer covers, is between 0.8 mm and 2.0 mm. However, as technology evolves, the market demands thinner notebook computers. Thinner notebook computers are more likely to be favored by buyers. However, thinner metal pieces cannot be processed by traditional processes and molds. Therefore, a molding method suitable for thinner metal pieces is needed. SUMMARY

[0003] The present invention provides a metal piece insert molding method, and the main purpose is to provide an insert molding method suitable for thinner metal pieces.

[0004] To achieve the foregoing purpose, the metal piece insert molding method of the present invention comprises:

[0005] A metal piece providing step provides a metal piece with a thickness of 0.5-0.7 mm;

[0006] A roughness increasing step uses a chemical agent to corrode the surface of the metal piece to increase the roughness of the surface of the metal piece;

[0007] A high-temperature pretreatment step places the metal piece with increased roughness in a heating device and heats the metal piece to 130-140°C;

[0008] A mold entering step embeds the heated metal piece in a mold and continues to heat, so that the metal piece is maintained at 130-140°C;

[0009] An insert molding step performs injection molding on the metal piece at 130-140°C to combine the plastic with the metal piece to form a finished product; and

[0010] A pretreatment deformation step removes the finished product from the mold, dries the finished product, clamps the finished product on a jig after drying, heats the finished product, and maintains the finished product at 110-130°C for 3-4 hours and then cools it to room temperature.

[0011] As described above, the present invention mainly heats the metal piece to 130-140°C before embedding it in the mold through the high-temperature pretreatment step, thereby improving the temperature conductivity of the metal piece and achieving better bonding strength when the metal piece is combined with the plastic.

[0012] In addition, by sequentially performing the above-mentioned providing a metal piece step, the roughness increasing step, the high-temperature pretreatment step, the mold entering step, the burying step, and the pretreatment deformation step, a metal piece with a thickness of less than 0.8 mm can be buried. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Flow chart of the metal piece burying forming method of the present application.

[0014] wherein,

[0015] a providing a metal piece step 10;

[0016] a roughness increasing step 20;

[0017] a high-temperature pretreatment step 30;

[0018] a mold entering step 40;

[0019] a burying step 50;

[0020] a pretreatment deformation step 60. DETAILED DESCRIPTION

[0021] The present application provides a metal piece burying forming method, as shown in Figure 1 The present application provides a metal piece burying forming method, as shown in

[0022] A providing a metal piece step 10 provides a metal piece with a thickness of 0.5-0.7 mm, preferably 0.6 mm. In this embodiment, the metal piece is an aluminum piece, which is in the form of a sheet, preferably cut into a predetermined shape by a punching die.

[0023] A roughness increasing step 20 uses a chemical agent to corrode the surface of the metal piece to increase the roughness of the surface of the metal piece, so that irregular pits are formed on the surface of the metal piece. In this embodiment, the chemical agent is sulfuric acid, but is not limited thereto. The chemical agent can also be nitric acid, hydrochloric acid, etc., so that the roughness (RZ) of the metal surface is 0.01-0.025 mm.

[0024] Preferably, in the roughness increasing step 20, the chemical agent is sprayed onto the surface of the metal piece by spraying.

[0025] Preferably, the time for the chemical agent to corrode the surface of the metal piece is 30-50 minutes, more preferably 40-45 minutes.

[0026] A high-temperature pre-treatment step 30 is performed to heat the metal piece to 130-140°C in a heating device. In this embodiment, the heating device is a heating platform.

[0027] Preferably, the high-temperature pre-treatment step 30 is performed for 10-12 seconds.

[0028] A mold insertion step 40 is performed to insert the heated metal piece into a mold and continue heating the metal piece to maintain the temperature at 130-140°C. In this embodiment, the mold insertion step 40 is performed by a mechanical arm on one side to suck the heated metal piece, take the metal piece out of the heating device and insert the metal piece into the female mold. The metal piece is maintained at 140°C in the mold.

[0029] Preferably, the mechanical arm is inserted into the mold within 7-10 seconds.

[0030] An injection step 50 is performed to perform injection molding on the metal piece at 130-140°C to combine the plastic with the metal piece to form a finished product.

[0031] Preferably, the injection step 50 is performed by a high-speed molding machine.

[0032] A pre-treatment deformation step 60 is performed to take the finished product out of the mold, dry the finished product, clamp the finished product on a jig and heat the finished product to 110-130°C for 3-4 hours and then cool the finished product to room temperature.

[0033] In this embodiment, the finished product is taken out of the mold by a mechanical arm on one side to suck the finished product.

[0034] In this embodiment, the finished product is generally rectangular and the jig includes four positioning clamps, each of which is clamped to a corner of the finished product.

[0035] In this embodiment, the finished product and the jig are placed in an oven to maintain the finished product at 110-130°C for 3-4 hours. Preferably, the heating time is 3.5 hours and the heating environment is 120°C.

[0036] In this embodiment, the cooling time after heating is 2 hours.

[0037] As described above, the high-temperature pre-treatment step 30 is performed to heat the metal piece to 130-140°C before inserting the metal piece into the mold, thereby improving the temperature conductivity of the metal piece and improving the bonding strength between the metal piece and the plastic.

[0038] In addition, by sequentially performing the above-mentioned providing metal piece step 10, roughness increasing step 20, high temperature pre-treatment step 30, mold entering step 40, burying step 50, and pre-treatment deformation step 60, the metal piece with a thickness less than 0.8 mm can be buried.

[0039] Furthermore, by the above-mentioned pre-treatment deformation step 60, the deformation of the finished product can be avoided, and the deformation of the finished product can be controlled within 0.8 mm.

[0040] Furthermore, since the metal piece of the present application is an aluminum piece, the strength can be increased and the weight can be reduced.

Claims

1. A method for injection molding of metal parts, characterized in that: include: a step of providing a metal member, wherein a metal member has a thickness ranging from 0.5 to 0.7 mm; a roughness increasing step of using a chemical agent to corrode the surface of the metal part to increase the roughness of the surface of the metal part; a high-temperature pretreatment step, placing the roughened metal piece in a heating device and heating the metal piece to 130° C. to 140° C.; a mold-into step, embedding the heated metal part into a mold and continuing to heat the metal part to maintain the temperature at 130° C. to 140° C.; a buried injection step, wherein the metal part is subjected to injection molding at a temperature of 130° C. to 140° C. to combine the plastic with the metal part to form a finished product; and A pretreatment deformation step is to remove the finished product from the mold and dry the finished product. After drying, the finished product is clamped on a fixture and heated to keep the finished product in an environment of 110°C to 130°C and maintain it for 3 to 4 hours before cooling it to room temperature.

2. The metal part injection molding method according to claim 1, wherein: The thickness of the metal piece is 0.6 mm.

3. The metal part injection molding method according to claim 1, wherein: The metal part is an aluminum part.

4. The metal part injection molding method according to claim 1, wherein: The chemical agent uses sulfuric acid, nitric acid or hydrochloric acid.

5. The metal part injection molding method according to claim 1, wherein: In the roughness increasing step, the chemical agent is sprayed on the surface of the metal part by spraying.

6. The metal part injection molding method according to claim 1, wherein: The time for the chemical agent to corrode the surface of the metal part is between 30 and 50 minutes.

7. The metal part injection molding method according to claim 6, wherein: The time for the chemical agent to corrode the surface of the metal part is between 40 and 45 minutes.

8. The metal part injection molding method according to claim 1, wherein: In the mold insertion step, the heated metal part is sucked by the suction cup on one side of the robot arm, the metal part located in the heating device is taken out and embedded in a mother mold of the mold. In the pretreatment deformation step, the finished product is sucked by the suction cup on one side of the robot arm to take out the finished product.

9. The metal part injection molding method according to claim 1, wherein: The finished product is rectangular, and the fixture includes four positioning clamps, each of which is clamped at the four corners of the finished product.

10. The metal part injection molding method according to claim 1, wherein: In the pretreatment deformation step, the heating time is 3.5 hours and the heating environment is 120°C.

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