A method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine

Abstract

The present invention provides a method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine, and relates to the field of workpiece casting. The mold for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine comprises a mold shell, a molding chamber is provided inside the mold shell, a mold column is provided inside the molding chamber, the mold column comprises a shaft, a sand layer is fixedly connected to the middle side wall of the shaft, a ceramic powder layer is fixedly connected to the side wall of the sand layer, a matching section is fixedly connected to the other end of the matching section, and after the casting of the workpiece is completed, the deflection of the reaming holes is eliminated through two processes. By providing the sand layer and the ceramic powder layer on the side wall of the mold column, the demoulding of the workpiece is facilitated, and at the same time, the mold column cooperates with the mold shell through the matching section, and the secondary processing eliminates the deflection of the reaming holes, thereby improving the quality of the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece casting, in particular to a method for preventing deflection of reaming holes of a middle plate and a tail plate casting of an injection molding machine. Background Art

[0002] Injection molding machines, also known as injection molding machines or injection machines, are the primary molding equipment used to create various shapes of plastic products from thermoplastics or thermosetting plastics using plastic molding molds. They are available in vertical, horizontal, and all-electric models. They heat the plastic and apply high pressure to the molten plastic, causing it to be ejected and fill the mold cavity.

[0003] The center and tail plates of injection molding machines are large, heavy, and structurally complex. They are typically cast. However, the complex structure and heavy weight of these plates require numerous molds to complete the casting. Using fewer molds hinders demolding of the casting. However, the large number of molds also poses installation accuracy issues, especially for the reaming holes, which can easily cause misalignment after the workpiece is formed. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present invention provides a method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of the injection molding machine, thereby solving the problem of the deflection of the reaming holes in the casting of the middle plate and tail plate of the injection molding machine.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a mold for preventing the ear holes of the middle plate and tail plate castings of an injection molding machine from being skewed, comprising a mold shell, a molding chamber is provided inside the mold shell, a mold column is provided inside the molding chamber, the mold column comprises a shaft body, the middle side wall of the shaft body is fixedly connected to a sand layer, the side wall of the sand layer is fixedly connected to a ceramic powder layer, both ends of the shaft body are fixedly connected to a mating section, and the other end of the mating section is fixedly connected to a clamping section.

[0008] Preferably, the mold shell is provided with a through hole at the mold column, and the through hole and the matching section are matched.

[0009] Preferably, a method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine comprises the following steps:

[0010] Step 1: Sieve the sand using a 30-40 mesh screen to remove larger impurities in the sand. Then wash it with water to remove soluble substances in the sand. Then add a binder to the sand and stir it thoroughly. Then, adhere the sand to the middle side wall of the shaft. After drying, a sand layer is formed, which is then trimmed.

[0011] Step 2: After the ceramic is crushed, it is sieved using a 500-600 mesh screen, and then water and a binder are added and fully stirred to form a slurry. The slurry is then sprayed on the surface of the sand layer using a sprayer. After the slurry dries, it is sprayed again. The spraying is repeated to finally obtain a ceramic powder layer, and the thickness of the ceramic powder layer must not be less than 2mm. Finally, the ceramic powder layer is trimmed and polished to meet the size requirements of the workpiece casting;

[0012] Step 3: Install the mold column in the mold shell through the clamping section, and close the mold to cast the workpiece. After the workpiece cools down, take it out and measure the position of the reaming hole of the workpiece. According to the measured data, the position of the reaming hole is corrected in the further reaming process;

[0013] Step 4: After processing in step 3, if the reaming hole is still skewed, use a measuring tool to measure the position of the reaming hole, and perform hole enlargement again to adjust the position of the reaming hole. After processing, install a copper sleeve at the reaming hole to meet the original aperture assembly requirements and eliminate the influence of the reaming hole deflection.

[0014] Preferably, the binder used for the sand in step 1 is one of clay, water glass and cement.

[0015] Preferably, the binder used for the ceramic powder in step 2 is one of phenolic resin, furan resin, isocyanate, and urethane resin.

[0016] Preferably, the surface roughness of the ceramic powder layer is less than Ra1.6.

[0017] (3) Beneficial effects

[0018] The present invention provides a method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine. It has the following beneficial effects:

[0019] 1. The present invention is provided with a mold column, and the matching section of the mold column and the mold shell are matched with high precision, which ensures the position accuracy of the reaming hole of the workpiece after casting. At the same time, the reaming hole of the workpiece is measured and processed once to eliminate the deflection of the reaming hole. If the deflection of the reaming hole cannot be eliminated, secondary processing is performed and a copper sleeve is installed, which not only prevents the scrapping of the workpiece, but also prevents the deflection of the reaming hole.

[0020] 2. In the present invention, the middle side wall of the shaft body is covered with a sand layer and a ceramic powder layer in sequence. When the workpiece is demolded, the two ends of the ceramic powder layer can be crushed in advance, and then the internal sand layer can be further crushed, which is conducive to the separation of the shaft body and the workpiece.

[0021] 3. In the present invention, ceramic powder is sieved to prepare a ceramic powder layer, and the ceramic powder layer is processed to improve the casting quality of the contact surface between the workpiece and the ceramic powder layer, which is beneficial to subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A partial schematic diagram of a casting mold used in the present invention;

[0023] Figure 2 It is a schematic cross-sectional view of the mold column of the present invention.

[0024] Among them, 1. mold shell; 2. mold column; 3. molding chamber; 4. shaft; 5. sand layer; 6. ceramic powder layer; 7. matching section; 8. clamping section. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example:

[0027] like Figure 1-2 As shown, an embodiment of the present invention provides a mold for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine, including a mold shell 1, the mold shell 1 only shows the structure of the reaming holes of the workpiece, a molding chamber 3 is provided inside the mold shell 1, a mold column 2 is provided inside the molding chamber 3, the mold column 2 includes a shaft body 4, a middle side wall of the shaft body 4 is fixedly connected with a sand layer 5, and a side wall of the sand layer 5 is fixedly connected with a ceramic powder layer 6. After the ceramic powder layer 6 is trimmed, the surface roughness of the ceramic powder layer 6 is greatly reduced, which can improve the casting quality of the workpiece. At the same time, a layer of sand layer 5 is first set. When the workpiece is demolded, the two ends of the ceramic powder layer 6 can be pre-crushed, and then the internal sand layer 4 is further crushed, which is beneficial to the separation of the shaft body 4 and the workpiece, and avoids the ceramic powder layer 6 from sintering together at high temperature, which is not conducive to the demolding of the workpiece. Both ends of the shaft body 4 are fixedly connected with a mating section 7, and the other end of the mating section 7 is fixedly connected with a clamping section 8.

[0028] The mold shell 1 is provided with a through hole at the mold column 2, and the through hole and the matching section 7 are precisely matched to ensure the position accuracy between the mold shell 1 and the mold column 2 and avoid the deflection of the reaming hole of the workpiece.

[0029] A method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine comprises the following steps:

[0030] Step 1: Sieve the sand using a 30-40 mesh screen to remove larger impurities in the sand, then wash it with water to remove soluble substances in the sand, and then add a binder to the sand. The binder is one of clay, water glass, and cement. The amount of the binder can be adjusted according to the properties of the sand layer 5 after completion. Stir it thoroughly and evenly. Then, adhere the sand to the middle side wall of the shaft 4. After drying, a sand layer 5 is formed, and the sand layer 5 is trimmed.

[0031] Step 2: After the ceramic is crushed, it is screened using a 500-600 mesh screen, and then water and a binder are added and fully stirred into a slurry. The binder is one of phenolic resin, furan resin, isocyanate, and urethane resin. The resin binder is decomposed in a high temperature environment to prevent the ceramic powder layer 5 from sintering together. Then, the slurry is sprayed on the surface of the sand layer 5 using a sprayer. After the slurry is dried, it is sprayed again. The spraying is repeated to finally obtain a ceramic powder layer 6, and the thickness of the ceramic powder layer 6 shall not be less than 2 mm. Finally, the ceramic powder layer 6 is trimmed and polished to meet the size requirements of the workpiece casting. The surface roughness of the ceramic powder layer 6 is less than Ra1.6, which improves the quality of the workpiece after casting and reduces the workload of workpiece processing.

[0032] Step 3: The mold column 2 is installed in the mold shell 1 through the clamping section 8, and the mold is closed to cast the workpiece. After the workpiece cools down, it is taken out and the position of the reaming hole of the workpiece is measured. According to the measured data, the position of the reaming hole is corrected in the further reaming process. After the workpiece is cast, the workpiece is processed to correct the deflected reaming hole.

[0033] Step 4: After processing in step 3, if the reaming hole is still skewed, use a measuring tool to measure the position of the reaming hole, and perform hole enlargement again to adjust the position of the reaming hole. After processing, install a copper sleeve at the reaming hole to meet the original aperture assembly requirements, eliminate the influence of the reaming hole deflection, and improve the wear resistance of the reaming hole.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine, comprising a mold, wherein the mold includes a mold shell (1), and is characterized in that: A molding chamber (3) is provided inside the mold shell (1), a mold column (2) is provided inside the molding chamber (3), the mold column (2) comprises a shaft (4), a sand layer (5) is fixedly connected to the middle side wall of the shaft (4), a ceramic powder layer (6) is fixedly connected to the side wall of the sand layer (5), both ends of the shaft (4) are fixedly connected to a matching section (7), and the other end of the matching section (7) is fixedly connected to a clamping section (8); A method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine comprises the following steps: Step 1: Sand is sieved using a 30-40 mesh screen to remove larger impurities in the sand, and then washed with water to remove soluble substances in the sand. A binder is then added to the sand and stirred thoroughly. The sand is then adhered to the middle side wall of the shaft (4). After drying, a sand layer (5) is formed, and the sand layer (5) is trimmed. Step 2: After the ceramic is crushed, it is sieved using a 500-600 mesh screen, and then water and a binder are added and fully stirred to form a slurry. The slurry is then sprayed on the surface of the sand layer (5) using a sprayer. After the slurry is dried, it is sprayed again. The spraying is repeated to finally obtain a ceramic powder layer (6), and the thickness of the ceramic powder layer (6) shall not be less than 2 mm. Finally, the ceramic powder layer (6) is trimmed and polished to meet the size requirements of the workpiece casting; Step 3: Install the mold column (2) in the mold shell (1) through the clamping section (8), and close the mold to cast the workpiece. After the workpiece cools down, take it out and measure the position of the reaming hole of the workpiece. According to the measured data, the position of the reaming hole is corrected in the further reaming process of the reaming hole. Step 4: After processing in step 3, if the reaming hole is still skewed, use a measuring tool to measure the position of the reaming hole, and perform hole enlargement again to adjust the position of the reaming hole. After processing, install a copper sleeve at the reaming hole to meet the original aperture assembly requirements and eliminate the influence of the reaming hole deflection.

2. A method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine according to claim 1, characterized in that: The mold shell (1) is provided with a through hole at the mold column (2), and the through hole and the matching section (7) are matched.

3. The method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine according to claim 1, characterized in that: The binder used for the sand in step 1 is one of clay, water glass and cement.

4. The method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine according to claim 1, characterized in that: The binder used for the ceramic powder in step 2 is one of phenolic resin, furan resin, isocyanate, and urethane resin.

5. The method for preventing the deflection of the reaming holes of the middle plate and tail plate castings of an injection molding machine according to claim 1, characterized in that: The surface roughness of the ceramic powder layer (6) is less than Ra1.6.

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