A riserless casting device for V-process

Abstract

This utility model discloses a riserless device for V-process casting, including a lower mold base and an upper mold base, which are engaged with each other. A lower forming groove is formed in the center of the top of the lower mold base, and a boss is fixedly provided at the bottom of the inner side of the lower forming groove. Each of the bosses has an air vent at its top. Lower positioning seats are fixedly provided at the top and bottom of the front of the lower mold base. This riserless device for V-process casting utilizes air vents at the top of the bosses to form a complete venting system. During injection molding, the air vents can promptly and effectively expel gas from the molten plastic, preventing air from being trapped in the cavity and forming bubbles. This helps the molten plastic fully fill every corner of the mold, improving the density and surface finish of the parts, significantly reducing surface defects and internal voids caused by air bubbles, improving the product's appearance quality and internal performance, and reducing subsequent processing and repair costs.

Description

Technical Field

[0001] This utility model relates to the field of V-process casting, specifically a riserless device for V-process casting. Background Technology

[0002] V-process casting, also known as vacuum sealing molding or negative pressure casting, is a casting process that uses a plastic film to create a vacuum, allowing dry sand to be molded. In traditional casting processes, risers are an important structure for feeding castings, but their design is complex and can easily lead to material waste.

[0003] To address the aforementioned issues, a riserless device for V-process casting is proposed here. Utility Model Content

[0004] The purpose of this invention is to provide a riserless device for V-process casting to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a riserless V-process casting device, comprising a lower mold base and an upper mold base, wherein the lower mold base and the upper mold base are engaged and connected, a lower forming groove is provided in the middle of the top of the lower mold base, a boss is fixedly provided at the bottom of the inner side of the lower forming groove, and air holes are provided at the top of several bosses, a lower positioning seat is fixedly provided at the top and bottom of the front of the lower mold base, an upper positioning seat is fixedly provided at the bottom and bottom of the front of the upper mold base, a mounting block is fixedly provided at the middle of the bottom of the two upper positioning seats, a mounting slot is provided at the middle of the top of the two lower positioning seats, and a connecting pin is fixedly provided at the bottom of the inner side of the two mounting slots.

[0006] This mold achieves a stable connection and precise positioning between the upper and lower mold bases through a double-locking structure of mounting blocks and slots, connecting pins and corresponding slots, and the cooperation of the lower and upper positioning seats. This design allows the mold to withstand greater pressure and impact during injection molding, reducing the likelihood of loosening, displacement, or separation, ensuring stable mold operation, and improving production safety and reliability. Precise positioning also helps guarantee the dimensional and shape accuracy of parts, reducing scrap rates. The vents at the top of the bosses form a complete venting system. During injection molding, the vents can effectively and promptly expel gases from the molten plastic, preventing air from being trapped in the cavity and forming bubbles. This helps the molten plastic fully fill every corner of the mold, improving the density and surface finish of the parts, significantly reducing surface defects and internal voids caused by bubbles, improving the product's appearance quality and internal performance, and reducing subsequent processing and repair costs.

[0007] Preferably, the front of each of the two lower positioning seats is threaded with a fixing bolt, and the outer side of each of the two mounting blocks is provided with a threaded hole, and the two fixing bolts are threadedly connected to the two threaded holes respectively.

[0008] Preferably, the two mounting blocks are respectively engaged and connected to the two mounting slots.

[0009] Preferably, each of the two mounting blocks has a connecting slot at its bottom, and the two connecting slots are respectively connected to two connecting posts.

[0010] Preferably, positioning holes are provided at the four corners of the top of the lower mold base, and positioning posts are fixedly provided at the four corners of the bottom of the upper mold base, with the four positioning holes respectively engaging with the four positioning posts.

[0011] Preferably, an upper forming groove is provided on the top of the inner side of the upper mold base, and an injection port is provided in the middle of the top of the upper mold base, and the injection port is connected to the upper forming groove.

[0012] Preferably, the upper forming groove and the lower forming groove are provided correspondingly.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This mold achieves a stable connection and precise positioning between the upper and lower mold bases through a double-locking structure of mounting blocks and mounting slots, connecting pins and corresponding slots, and the cooperation of the lower and upper positioning seats. This design allows the mold to withstand greater pressure and impact during injection molding, preventing loosening, displacement, or separation, ensuring stable mold operation, and improving production safety and reliability. Simultaneously, precise positioning helps guarantee the dimensional and shape accuracy of parts, reducing scrap rates. The air vents at the top of the boss constitute a complete venting system. During injection molding, the air vents can promptly and effectively expel gas from the molten plastic, preventing air from being trapped in the cavity and forming bubbles. This helps the molten plastic fully fill every corner of the mold, improving the density and surface smoothness of the parts, significantly reducing surface defects and internal voids caused by air bubbles, improving the product's appearance quality and internal performance, and reducing subsequent processing and repair costs. Attached Figure Description

[0014] Figure 1 This is the first perspective view of the present invention; Figure 2 This is a second perspective view of the present invention; Figure 3 This is a structural diagram of the lower positioning seat of this utility model; Figure 4 This is a structural diagram of the upper positioning seat of this utility model.

[0015] In the diagram: 1. Lower mold base; 2. Positioning hole; 3. Lower forming groove; 4. Boss; 5. Air hole; 6. Upper mold base; 7. Positioning pin; 8. Injection port; 9. Lower positioning seat; 10. Upper positioning seat; 11. Upper forming groove; 12. Mounting slot; 13. Connecting pin; 14. Fixing bolt; 15. Mounting block; 16. Threaded hole; 17. Connecting slot. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example 1

[0017] Please see Figure 1-4 This utility model provides a riserless device for V-process casting, including a lower mold base 1 and an upper mold base 6. The lower mold base 1 and the upper mold base 6 are engaged and connected. A lower forming groove 3 is opened in the middle of the top of the lower mold base 1. A boss 4 is fixedly provided on the bottom of the inner side of the lower forming groove 3. A vent 5 is provided on the top of several bosses 4. A lower positioning seat 9 is fixedly provided on the top and bottom of the front of the lower mold base 1. An upper positioning seat 10 is fixedly provided on the bottom and bottom of the front of the upper mold base 6. A mounting block 15 is fixedly provided in the middle of the bottom of the two upper positioning seats 10. A mounting block 15 is opened in the middle of the top of the two lower positioning seats 9. The mold has two mounting slots 12, with connecting pins 13 fixedly installed at the bottom of the inner side of each slot 12. Two lower positioning seats 9 have threaded fixing bolts 14 on their front sides. Two mounting blocks 15 have threaded holes 16 on their outer sides. The two fixing bolts 14 are threaded into the two threaded holes 16 respectively. The two mounting blocks 15 are engaged with the two mounting slots 12 respectively. Through the double engagement structure of the mounting blocks 15 and mounting slots 12, and the connecting pins 13 and their corresponding slots, as well as the cooperation between the lower positioning seats 9 and the upper positioning seats 10, the mold achieves a stable connection and precise positioning between the upper mold base 6 and the lower mold base 1. This design allows the mold to withstand greater pressure and impact during injection molding, preventing loosening, displacement, or separation, ensuring stable mold operation, and improving production safety and reliability. Precise positioning also helps ensure the dimensional and shape accuracy of the parts, reducing the scrap rate. The air vents 5 at the top of the boss 4 constitute a complete venting system. During injection molding, the air vent 5 can promptly and effectively expel gas from inside the molten plastic, preventing air from being trapped in the cavity and forming bubbles. This helps the molten plastic fully fill every corner of the mold, improving the density and surface finish of the parts, significantly reducing surface defects and internal voids caused by air bubbles, improving the product's appearance quality and internal performance, and reducing the cost of subsequent processing and repair.

[0018] In this embodiment, the bosses 4 can be precisely shaped and sized. Each boss 4 has an air vent 5 at its top. The air vent 5 is for venting air during the molding process. When the mold closes and material is injected into the lower molding groove 3, air may become trapped inside the material, forming bubbles and affecting the quality of the part. The air vent 5 allows air to be released promptly, ensuring that the material fully fills the mold cavity, improving the density and surface quality of the part. Through the cooperation of the lower positioning seat 9, upper positioning seat 10, mounting block 15, and mounting groove 12, and the auxiliary positioning of the connecting pin 13, precise positioning of the upper mold base 6 and lower mold base 1 is achieved. This precise positioning ensures that the upper molding part and the lower molding groove 3 are accurately aligned when the mold is closed, thereby guaranteeing the dimensional and shape accuracy of the mold parts and greatly improving the quality stability and consistency of the product. The upper positioning seat 10 and lower positioning seat 9 cooperate to achieve precise mold positioning. Each of the two upper positioning seats 10 has a fixed mounting block 15 at the middle of its bottom end. The shape and size of the mounting block 15 match the mounting slot 12 on the lower positioning seat 9, providing specific structural support for the engagement connection between the upper mold seat 6 and the lower mold seat 1. Example 2

[0019] Please see Figure 1-4This utility model provides a riserless device for V-process casting, including a lower mold base 1 and an upper mold base 6. The lower mold base 1 and the upper mold base 6 are engaged and connected. A lower forming groove 3 is provided in the middle of the top of the lower mold base 1. A boss 4 is fixedly provided at the bottom of the inner side of the lower forming groove 3. Each of the bosses 4 has an air hole 5 at its top. Lower positioning seats 9 are fixedly provided at the top and bottom of the front of the lower mold base 1. Upper positioning seats 10 are fixedly provided at the bottom and bottom of the front of the upper mold base 6. A mounting block 15 is fixedly provided in the middle of the bottom of each of the two upper positioning seats 10. A mounting groove 12 is provided in the middle of the top of each of the two lower positioning seats 9. Connecting pins 13 are fixedly installed at the bottom of the inner side of the two mounting slots 12. Connecting slots 17 are opened at the bottom of the two mounting blocks 15, and the two connecting slots 17 are respectively connected to the two connecting pins 13. Positioning holes 2 are opened at the four corners of the top of the lower mold base 1, and positioning pins 7 are fixedly installed at the four corners of the bottom of the upper mold base 6. The four positioning holes 2 are respectively engaged with the four positioning pins 7. Through the double engaging structure of the mounting blocks 15 and mounting slots 12, and the connecting pins 13 and their corresponding slots, as well as the cooperation of the lower positioning base 9 and the upper positioning base 10, the mold achieves a stable connection and precise positioning between the upper mold base 6 and the lower mold base 1. This design allows the mold to withstand greater pressure and impact during injection molding, preventing loosening, displacement, or separation, ensuring stable mold operation, and improving production safety and reliability. At the same time, precise positioning also helps ensure the dimensional and shape accuracy of the parts, reducing the scrap rate. The air vents 5 at the top of the boss 4 constitute a complete venting system. During injection molding, the air vent 5 can promptly and effectively expel gas from inside the molten plastic, preventing air from being trapped in the cavity and forming bubbles. This helps the molten plastic fully fill every corner of the mold, improving the density and surface finish of the parts, significantly reducing surface defects and internal voids caused by air bubbles, improving the product's appearance quality and internal performance, and reducing the cost of subsequent processing and repair.

[0020] In this embodiment, the initial positioning of the positioning hole 2 and the positioning post 7, the positioning of the lower positioning seat 9 and the upper positioning seat 10, and the double-locking positioning of the mounting block 15 and the mounting slot 12, and the connecting post 13 and the connecting slot 17, achieve precise alignment of the upper mold base 6 and the lower mold base 1 in multiple directions. The outer diameter and length of the positioning post 7 need to be precisely designed according to the size of the positioning hole 2 to ensure that it can be smoothly inserted into the positioning hole 2 and achieve a tight fit. When the mold is closed, the positioning post 7 is inserted into the positioning hole 2, further restricting the relative movement of the upper mold base 6 and the lower mold base 1 in various directions, ensuring precise alignment of the mold. When the upper mold base 6 and the lower mold base 1 are engaged, the mounting block 15 will accurately engage in the mounting slot 12, and the connecting post 13 will be inserted into the connecting slot 17, forming a double-locking structure. This design can not only restrict the relative movement of the upper mold base 6 and the lower mold base 1 in the horizontal direction, but also prevent them from separating in the vertical direction to a certain extent, enhancing the stability of the mold connection. Example 3

[0021] Please see Figure 1-4This utility model provides a riserless device for V-process casting, including a lower mold base 1 and an upper mold base 6. The lower mold base 1 and the upper mold base 6 are engaged and connected. A lower forming groove 3 is opened in the middle of the top of the lower mold base 1. A boss 4 is fixedly provided at the bottom of the inner side of the lower forming groove 3. A few bosses 4 are provided with air holes 5 at their tops. Lower positioning seats 9 are fixedly provided at the top and bottom of the front of the lower mold base 1. Upper positioning seats 10 are fixedly provided at the bottom and bottom of the front of the upper mold base 6. A mounting block 15 is fixedly provided at the middle of the bottom of the two upper positioning seats 10. Two lower positioning blocks 15 are fixedly provided at the bottom of the two upper positioning seats 10. Each of the top centers of the base 9 has a mounting slot 12, and a connecting pin 13 is fixedly installed at the bottom of the inner side of each mounting slot 12. The top of the inner side of the upper mold base 6 has an upper forming groove 11, and the center of the top of the upper mold base 6 has an injection port 8 connected to the upper forming groove 11. The upper forming groove 11 corresponds to the lower forming groove 3. This mold achieves a stable connection and precise positioning between the upper mold base 6 and the lower mold base 1 through a double-locking structure of the mounting block 15 and the mounting slot 12, the connecting pin 13 and the corresponding slot, and the cooperation of the lower positioning base 9 and the upper positioning base 10. This design allows the mold to withstand greater pressure and impact during injection molding, preventing loosening, displacement, or separation, ensuring stable mold operation, and improving production safety and reliability. Precise positioning also helps ensure the dimensional and shape accuracy of the parts, reducing the scrap rate. The air vent 5 at the top of the boss 4 constitutes a complete venting system. During injection molding, the air vent 5 can promptly and effectively expel gas from inside the molten plastic, preventing air from being trapped in the cavity and forming bubbles. This helps the molten plastic fully fill every corner of the mold, improving the density and surface finish of the parts, significantly reducing surface defects and internal voids caused by air bubbles, improving the product's appearance quality and internal performance, and reducing the cost of subsequent processing and repair.

[0022] In this embodiment, the upper forming groove 11 is provided on the top of the inner side of the upper mold base 6. The upper forming groove 11 and the lower forming groove 3 are correspondingly arranged, and together they constitute the forming cavity of the mold. During the injection molding process, the molten plastic fills the space formed by the upper forming groove 11 and the lower forming groove 3 under pressure, and finally cools and solidifies into the required part. The shape and size of the upper forming groove 11 are also carefully designed to precisely match the lower forming groove 3 to ensure the dimensional and shape accuracy of the part. The injection port 8 is connected to the upper forming groove 11 and is the channel for the molten plastic to enter the mold cavity. Its design directly affects the quality and efficiency of the injection molding process. The size, shape, and position of the injection port 8 need to be optimized according to factors such as the fluidity of the plastic and the shape and size of the part. The air hole 5 provided at the top of the boss 4 constitutes a complete venting system. During the injection molding process, the air hole 5 can timely and effectively discharge the gas inside the molten plastic, avoiding air being trapped in the cavity and forming bubbles. This helps the molten plastic fully fill every corner of the mold, improving the density and surface finish of the parts, significantly reducing surface defects and internal voids caused by air bubbles, improving the appearance quality and internal performance of the product, and reducing the cost of subsequent processing and repair.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A riserless casting device for V-process, comprising a lower mold base (1) and an upper mold base (6), characterized in that: The lower mold base (1) is engaged with the upper mold base (6). The lower mold base (1) has a lower forming groove (3) at the middle of its top end. The lower forming groove (3) has a boss (4) fixedly installed at the bottom of its inner side. Each of the bosses (4) has an air hole (5) at its top. The lower mold base (1) has a lower positioning seat (9) fixedly installed at the top of its front side and the bottom of its front side. The upper mold base (6) has an upper positioning seat (10) fixedly installed at the bottom of its front side and the bottom of its front side. Each of the two upper positioning seats (10) has a mounting block (15) fixedly installed at the middle of its bottom end. Each of the two lower positioning seats (9) has a mounting slot (12) at the middle of its top end. Each of the two mounting slots (12) has a connecting pin (13) fixedly installed at the bottom of its inner side.

2. A V-process casting without riser device according to claim 1, characterized in that: Both lower positioning seats (9) have threaded fixing bolts (14) on their front sides, and both mounting blocks (15) have threaded holes (16) on their outer sides. The two fixing bolts (14) are threadedly connected to the two threaded holes (16) respectively.

3. A V-process casting without riser device according to claim 1, characterized in that: The two mounting blocks (15) are respectively engaged with the two mounting slots (12).

4. A V-process casting without riser device according to claim 1, characterized in that: The bottom ends of the two mounting blocks (15) are provided with connecting slots (17), and the two connecting slots (17) are respectively connected to the two connecting posts (13).

5. A V-process casting without riser device according to claim 1, characterized in that: The lower mold base (1) has four positioning holes (2) at its top corners, and the upper mold base (6) has four positioning posts (7) fixedly installed at its bottom corners. The four positioning holes (2) are respectively engaged with the four positioning posts (7).

6. A V-process casting without riser device according to claim 1, characterized in that: The upper mold base (6) has an upper molding groove (11) on the top of its inner side, and an injection port (8) is provided in the middle of the top of the upper mold base (6). The injection port (8) is connected to the upper molding groove (11).

7. A V-process casting without riser device according to claim 6, characterized in that: The upper forming groove (11) and the lower forming groove (3) are respectively provided.

Images