A mold

Abstract

This invention provides a mold, belonging to the field of mold technology. It solves the problem of poor burr and flash cleaning effect. It includes a fixed mold and a moving mold assembly. The moving mold assembly includes a base, a moving mold that can move forward relative to the base and has a through hole at its front end, and an inner core extending through the through hole. The inner core includes a core block fixed to the base and several inner sliders surrounding the side of the core block. When the moving mold moves forward relative to the base, it drives each inner slider to move forward. When each inner slider moves forward, it contracts inward, creating a gap between each inner slider and the inner wall of the through hole. The moving mold has several air pipes and / or several air holes, all located behind the through hole. The air pipes and / or air holes are distributed circumferentially along the through hole. After the moving mold drives each inner slider forward, air can be blown through the air pipes and / or air holes into the gaps formed between each inner slider and the inner wall of the through hole. It has the advantages of good burr and flash cleaning effect.

Description

Technical Field

[0001] This invention belongs to the field of mold technology and relates to a mold. Background Technology

[0002] Die castings are metal parts formed using a pressure casting process. Molten metal (commonly copper or aluminum) is injected into a die casting mold under high pressure and rapidly cooled to form the final product. These die casting molds typically consist of a fixed mold and a moving mold. The moving mold assembly has several external sliders at its front end. After the fixed and moving molds are closed, these external sliders converge, forming a cavity with the same shape as the desired product between the external sliders, the fixed mold, and the moving mold. A gate connected to the cavity is located on the outside of the fixed mold, allowing molten metal to be injected into the cavity. For box-shaped or near-box-shaped products (i.e., products with an internal cavity), an inner core is also used. The shape of the moving mold's inner core is the same as the shape of the box-shaped product's internal cavity. After the fixed and moving molds open, the box-shaped product is secured to the inner core (the external sliders separate as the mold opens). To remove the box-shaped product from the inner core, an internal core-pulling process is required. The internal core-pulling mechanism consists of a core block and several inner sliders surrounding the side of the core block and slidingly connected to it along the mold opening direction. The moving mold has through holes for the front end of the inner core to pass through and be located in the cavity. A base is provided at the rear of the moving mold, and the core block is fixed to the base. The base and the moving mold together form a moving mold assembly that can move relative to the fixed mold. At the same time, the moving mold can also move independently relative to the base. During internal core-pulling, the moving mold drives each inner slider to move forward along the core block. Each inner slider will gradually contract inward and separate from the inner wall of the product, allowing the product to be removed. This method is similar to that disclosed in patent application No. 201520669364.9 entitled "Molding System and Injection Mold" and patent application No. 201410759943.2 entitled "Secondary Mold Opening Slider Internal Pulling Mechanism for Junction Box Mold".

[0003] Molten metal is injected into the mold cavity at high speed, generating significant pressure. This inevitably causes some of the molten metal to be squeezed into the space between the inner slides and the moving mold where the core protrudes, forming burrs upon cooling. Burrs also form on the outer slides. Therefore, it is essential to clean these burrs after each product manufacturing process to ensure proper mold closing accuracy. Currently, the conventional cleaning method involves placing an air gun next to the mold. After each product manufacturing, a worker holds the air gun and uses the air to blow away the burrs. However, in practice, the gap between the core and the inner wall of the through-hole after demolding is quite small, preventing the air gun from directly penetrating the gap. Therefore, the worker must simply hold the cylinder and blow air obliquely into the gap from the moving mold surface. This often results in the burrs not only failing to be blown out but actually being pushed further in, leading to poor burr removal. In response to this situation, the most common method is to use hooks or tweezers to reach into the gap between the inner core and the inner wall of the through hole to clean the burrs and flash. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a mold that solves the problem of poor cleaning effect of burrs and flash.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A mold includes a fixed mold and a moving mold assembly. The moving mold assembly includes a base, a moving mold that can move forward relative to the base and has a through hole at its front end, and an inner core that extends through the through hole at its front end. After the mold is closed, a cavity is formed between the fixed mold, the moving mold, and the inner core. The inner core includes a core block fixed to the base and a plurality of inner sliders surrounding the side of the core block. When the moving mold moves forward relative to the base, it can drive each inner slider to move forward. When each inner slider moves forward, it will contract inward and create a gap between each inner slider and the inner wall of the through hole. The moving mold is characterized in that it is provided with a plurality of air blowing pipes and / or a plurality of air blowing holes. Each air blowing pipe and each air blowing hole is located behind the through hole and is distributed along the circumference of the through hole. After the moving mold drives each inner slider to move forward, air can be blown into the gap formed between each inner slider and the inner wall of the through hole through each air blowing pipe and / or each air blowing hole.

[0007] In the closed mold state, a cavity is formed between the fixed mold, moving mold, and inner core. Molten metal is injected into the cavity, and after cooling, a box-shaped product is formed. Next, the moving mold assembly is moved away from the fixed mold; this is the mold opening action. After the moving mold assembly separates from the fixed mold, the resulting product still holds onto the inner sliders of the inner core, preventing direct removal. Then, the demolding action occurs, driving the moving mold forward relative to the base. At this time, the moving mold causes the inner sliders within the inner core to move forward along the core block and retract inward. As the inner sliders retract inward, the product can be removed.

[0008] The molten metal is injected into the cavity at high speed, which generates a lot of pressure. This inevitably causes the molten metal injected into the cavity to be squeezed between the inner sliders and the inner wall of the through holes, forming burrs after cooling. To address this, the mold incorporates several air blowing pipes and / or air blowing holes within the moving mold. Each air blowing pipe and hole is located behind the through hole and is circumferentially distributed along the central axis of the through hole. When the inner sliders are in an inwardly contracted state, a gap is formed between the outer side of each inner slider and the inner wall of the through hole at the front end of the moving mold. This allows air to be blown into the gaps formed between the inner sliders and the inner wall of the through hole through the air blowing pipes and / or air blowing holes. Because the air blowing pipes and holes are located behind the through hole, the air can generate a forward blowing force into the gaps. Simultaneously, the circumferential distribution of the air blowing pipes and / or air blowing holes ensures that the entire gap is essentially covered. This effectively blows away the burrs and flash formed between the inner sliders and the inner wall of the through hole, significantly improving the cleaning effect and ensuring the precision during mold re-closure to guarantee product quality.

[0009] Of course, in practice, each air tube can be used individually, each air hole can be used individually, or each air tube and each air hole can be used simultaneously. When using air tubes and air holes simultaneously, the force and volume of air blowing can be increased, thereby greatly improving the cleaning effect on the burrs formed between the inner sliders and the inner wall of the through holes.

[0010] In one of the above-mentioned molds, there is a clearance gap between the rear end sidewalls of every two adjacent inner sliders, and each air blowing pipe and / or each air blowing hole is located within the clearance gap. The air outlet end of each air blowing pipe and / or each air blowing hole is opposite to the gap formed between each inner slider and the inner wall of the through hole after each inner slider slides forward.

[0011] A clearance gap is provided between the rear end sidewalls of every two adjacent inner sliders. Each air pipe and / or air hole is located within its respective clearance gap, ensuring that the placement of the air pipes and air holes does not interfere with the movement of the inner sliders. Gas is blown out from the outlet end of the air pipe and / or the outlet end. The outlet end of each air pipe and / or each air hole is aligned with the aforementioned gap formed between the inner slider and the inner wall of the through hole after the inner slider slides forward. This ensures that the gas can blow away the burrs and flash formed between the inner slider and the inner wall of the through hole, improving the cleaning effect. Moreover, this essentially covers the entire gap, resulting in a better cleaning effect.

[0012] In one of the aforementioned molds, the moving mold is further provided with an air inlet pipe and an annular air passage pipe. The air passage pipe is located on the outer rear end of each inner slider. Each air blowing pipe is L-shaped. One end of each air blowing pipe is fixedly connected to the inner side of the air passage pipe, and each air blowing pipe is connected to the air passage pipe. One end of the air inlet pipe is fixedly connected to the air passage pipe and forms a connection. The other end of the air inlet pipe is located outside the moving mold.

[0013] One end of the air inlet pipe is fixedly connected to a ring-shaped air passage pipe, forming a connection. The other end of the air inlet pipe is located outside the moving mold. The air inlet end of each air blowing pipe is fixedly connected to the inside of the air passage pipe, and each air blowing pipe is connected to the air passage pipe. In practice, only one air inlet pipe needs to be introduced into the air inlet pipe, and then the ring-shaped air passage pipe can simultaneously distribute the gas to each air blowing pipe. This structure simplifies the connection of the air path and improves the stability of the air supply, preventing any air blowing pipe from failing to supply air. By setting the air blowing pipes in an L-shape, the air inlet end of the air blowing pipe is fixed to the inside of the air passage pipe, while the air outlet end of the air blowing pipe is positioned forward and enters the gap formed between the inner slider and the inner wall of the through hole after the slider moves forward. This improves the stability of the air supply while ensuring a cleaning effect.

[0014] In one of the aforementioned molds, the moving mold includes a front mold base and a rear support plate fixedly connected to the rear end of the front mold base. A through hole is provided at the front end of the front mold base, and a cavity communicating with the through hole is provided at the rear end of the front mold base. The outer side of the rear end of each inner slider has a raised edge, which abuts against the rear support plate and the bottom wall of the cavity. The side wall of the cavity is provided with several relief grooves along the circumferential direction, and each air blowing pipe passes through each relief groove into the cavity.

[0015] The moving mold is configured to include a front mold base and a rear support plate fixedly connected to the rear end of the front mold base. A through hole is provided at the front end of the front mold base for the entire inner core to pass through. A cavity connected to the through hole is provided at the rear end of the front mold base. A raised edge is provided on the outer side of the rear end of each inner slider. The raised edge abuts against the bottom wall of the cavity and the rear support plate, fixing the inner slider and the front mold base in the front-rear direction. Thus, when the moving mold moves forward relative to the base, it can drive each inner slider to move forward relative to the core block. Simultaneously, the raised edge will translate within the cavity in a direction perpendicular to the central axis of the core block, ensuring that it does not affect the synchronous inward contraction of each inner slider as it moves forward. The rear support plate essentially seals the cavity; therefore, several clearance grooves are provided circumferentially on the side wall of the cavity. These clearance grooves allow space for each air blowing pipe, ensuring that the air blowing pipe can enter the cavity and be positioned between the rear ends of two adjacent inner sliders.

[0016] In one of the aforementioned molds, the rear end of the front mold base is further provided with an annular mounting groove 1 and a straight mounting groove 2. The mounting groove 2 is connected to the mounting groove 1 and penetrates the side wall of the front mold base. The air passage pipe is located in the mounting groove 1, the air inlet pipe is located in the mounting groove 2, the cavity is located inside the mounting groove 1, and each clearance groove is connected to the mounting groove 1.

[0017] During installation, place the air passage pipe into the annular mounting groove one and ensure that the air inlet pipe is placed in the straight mounting groove two. Because the cavity is located inside mounting groove one and all the clearance grooves are connected to mounting groove one, this allows the air blowing pipes fixed inside the air passage pipe to extend into the cavity through the clearance grooves. Finally, fix the rear support plate to the rear end of the front mold base. The rear support plate can directly position the air passage pipe and air inlet pipe in mounting groove one and mounting groove two, respectively. This structure greatly improves the ease of installation of the air blowing structure on the moving mold.

[0018] In one of the aforementioned molds, as another technical solution, the moving mold includes a front mold base and a rear support plate fixedly connected to the rear end of the front mold base. The front end of the front mold base is provided with a through hole, and the rear end of the front mold base is provided with a cavity communicating with the through hole. The outer side of the rear end of each slider has a raised edge, which abuts against the rear support plate and the bottom wall of the cavity. The air blowing pipe is L-shaped. The rear end of the front mold base is provided with a number of mounting straight grooves that are the same as and correspond one-to-one with the air blowing pipes. Each mounting straight groove penetrates the side wall of the front mold base and is connected to the cavity. The air inlet end of each air blowing pipe extends out to the outside of the side wall of the front mold base through the corresponding mounting straight groove, and the air outlet end of each air blowing pipe passes through each clearance groove into the cavity.

[0019] The moving mold is configured to include a front mold base and a rear support plate fixedly connected to the rear end of the front mold base. The front end of the front mold base is provided with a through hole for the front end of the entire inner core to pass through, and a cavity connected to the through hole is provided at the rear end of the front mold base. A protruding edge is provided on the outer side of the rear end of each inner slider. The protruding edge abuts against the bottom wall of the cavity and the rear support plate, so that the inner slider and the front mold base are fixed in the front-back direction. In this way, when the moving mold moves forward relative to the base, it can drive each inner slider to move forward relative to the core block. At the same time, the protruding edge will translate in the cavity in a direction perpendicular to the central axis of the core block to ensure that it will not affect the synchronous inward contraction of each inner slider when it moves forward.

[0020] In one of the aforementioned molds, the air outlet end of the air blowing pipe has a flat, wide-mouth shape.

[0021] By making the air outlet end of the air blowing pipe into a flat, wide-mouth shape, the air blowing range of the air blowing pipe can be increased, thereby improving the cleaning effect on the burrs formed between the inner sliders and the moving mold where the inner core protrudes.

[0022] In one of the aforementioned molds, the rear support plate is provided with an air blowing channel inside. The inlet of the air blowing channel is located on the side wall of the rear support plate, and each air blowing hole is located at the front end of the rear support plate. Each air blowing hole is connected to the air blowing channel, and each air blowing hole is located between the rear ends of every two adjacent inner sliders.

[0023] The through holes are located at the front end of the front mold base. The air blowing holes are located at the front end of the rear support plate, and an air blowing channel is set inside the rear support plate. The inlet of the air blowing channel is located on the side wall of the rear support plate, and each air blowing hole is connected to the air blowing channel. After air is introduced into the air blowing channel, the gas can be distributed to each air blowing hole through the air blowing channel. Because the rear support plate is behind the front mold base, the gas blown out through each air blowing hole can blow straight forward and blow out the burrs formed between each inner slider and the inner wall of the through hole to improve the cleaning effect.

[0024] Compared with existing technologies, this mold has several air blowing pipes and / or several air blowing holes in the moving mold. Each air blowing pipe and each air blowing hole is located behind the through hole and is distributed circumferentially along the central axis of the through hole. When each inner slider is in an inward contraction state, a gap is formed between the outer side of each inner slider and the inner wall of the through hole at the front end of the moving mold. In this way, air can be blown into the gap formed between each inner slider and the inner wall of the through hole through each air blowing pipe and / or air blowing hole. Because each air blowing pipe and air blowing hole is behind the through hole, the air can generate a forward blowing force into the gap through the air blowing pipe and / or air blowing hole. At the same time, the circumferential distribution of each air blowing pipe and / or air blowing hole along the through hole ensures that the entire gap can be basically covered. This can blow away the burrs formed between each inner slider and the inner wall of the through hole, which greatly improves the cleaning effect and ensures the accuracy when the mold is closed again to ensure product quality. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the mold in the closed state.

[0026] Figure 2 This is a cross-sectional view of the mold in the closed state.

[0027] Figure 3 This is a three-dimensional schematic diagram of the mold in the open state.

[0028] Figure 4 This is a schematic diagram of the front end of the moving mold assembly in the mold-closed state (after removing the outer slider).

[0029] Figure 5 This is the front view of the moving mold in the mold-closed state.

[0030] Figure 6 This is a 3D schematic diagram of the chip.

[0031] Figure 7 yes Figure 5 Sectional view along the AA direction.

[0032] Figure 8 This is the rear view of the front mold base.

[0033] Figure 9 This is a partially exploded schematic diagram of the front mold base.

[0034] Figure 10 This is a schematic diagram showing the fit between the air intake pipe, air passage pipe, air blowing pipe, and inner core.

[0035] Figure 11 This is a 3D schematic diagram of the rear support plate.

[0036] Figure 12 This is a schematic diagram of the front end of the moving mold component in the demolded state.

[0037] Figure 13 This is a sectional view of the moving mold in the demolded state (the sectional direction is the same as the previous view). Figure 5 same).

[0038] In the diagram, 1. Fixed mold; 1a. Gate; 2. Moving mold assembly; 3. Base; 4. Moving mold; 4a. Front mold base; 4a1. Through hole; 4a2. Cavity; 4a3. Relief groove; 4a4. Mounting groove one; 4a5. Mounting groove two; 4a6. Template; 4a7. Outer slider; 4b. Rear support plate; 4b1. Air blowing channel; 4b2. Air blowing hole; 5. Inner core; 5a. Core block; 5a1. Slide groove one; 5a2. Slide rail two; 5b. Inner slider; 5b1. Protruding edge; 6. Cavity; 7. Ejector plate; 8. Connecting pillar; 9. Air blowing pipe; 10. Air inlet pipe; 11. Air passage pipe. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0040] Example 1

[0041] like Figure 1 , Figure 2 and Figure 3As shown, a mold includes a fixed mold 1 and a moving mold assembly 2. The moving mold assembly 2 includes a base 3, a moving mold 4 that can move forward relative to the base 3, and an inner core 5 that extends out of the moving mold 4 at its front end. After the mold is closed, a cavity 6 is formed between the fixed mold 1, the moving mold 4, and the inner core 5. The fixed mold 1 has a gate 1a on the side facing away from the moving mold assembly 2. After the mold is closed, the gate 1a is connected to the cavity 6. In this embodiment, the part of the inner core 5 that extends out of the moving mold 4 has a shape that is small in the front and large in the middle, so that the formed product is a box shape with a large inner cavity and a small opening. The inner core 5 includes a core block 5a fixed to the base 3 and several inner sliders 5b surrounding the side of the core block 5a. In the mold closed state, the front end sidewalls of every two adjacent inner sliders 5b are in contact. When the moving mold 4 moves forward relative to the base 3, it can drive each inner slider 5b to move forward relative to the core block 5a. When each inner slider 5b moves forward, it will shrink inward and create a gap between the inner slider 5b and the inner wall of the through hole 4a1. The moving mold 4 includes a front mold base 4a and a rear support plate 4b fixedly connected to the rear end of the front mold base 4a. The front end of the front mold base 4a has a through hole 4a1, and the rear end of the front mold base 4a has a cavity 4a2 communicating with the through hole 4a1. Each inner slider 5b has a raised edge 5b1 on the outer side of its rear end. The raised edge 5b1 abuts against the bottom wall of the rear support plate 4b and the cavity 4a2, so that the inner slider 5b and the front mold base 4a are fixed in the front-rear direction. In this way, when the moving mold 4 moves forward relative to the base 3, it can drive the inner slider 5b to move forward relative to the core block 5a. The rear support plate 4b has a clearance hole. The rear part of the core block 5a is square and passes through the rear support plate 4b and is fixed to the base 3.

[0042] like Figure 2 and Figure 3 As shown, the front mold base 4a includes a template 4a6 and several outer sliders 4a7 slidably connected to the front end of the template 4a6. The front end of the inner core 5 is located inside each outer slider 4a7. The cavity 6 is specifically formed by the template 4a6, each outer slider 4a7, the fixed mold 1, and the inner core 5. When the fixed mold 1 separates from the moving mold assembly 2, each outer slider 4a7 slides at the front end of the template 4a6 and moves away from the inner core 5. In practice, the fixed mold 1 has a number of inclined guide rods (not shown in the figure) that are the same as the number of outer sliders 4a7. Each inclined guide rod passes through each outer slider 4a7. When the fixed mold 1 separates from the moving mold assembly 2, the inclined guide rods will exert a pushing force on the outer sliders 4a7 to move them away from the inner core 5. Of course, after the fixed mold 1 and the moving mold assembly 2 are separated, the inclined guide rods will disengage from the outer sliders 4a7. When the mold is closed again, the inclined guide rods will insert into the outer sliders 4a7 and push the outer sliders 4a7 closer to the inner core 5. The moving mold assembly 2 also includes a push plate 7 located behind the base 3. The push plate 7 is fixedly connected to the rear support plate 4b by several connecting posts 8 passing through the base 3, and the push plate 7 is driven to move by a hydraulic cylinder / pneumatic cylinder.

[0043] Specifically, such as Figure 4 , Figure 5and Figure 6 As shown, the cross-section of the front part of the core block 5a gradually decreases from back to front. The front part of the core block 5a has several sliding grooves 5a1 along the front-back direction, and a sliding rail 5a2 is provided between two adjacent sliding grooves 5a1 along the front-back direction. Both the sliding grooves 5a1 and the sliding rails 5a2 are inclined relative to the central axis of the core block 5a, that is, the sliding grooves 5a1 and the sliding rails 5a2 have the same slope as the front part of the core block 5a. A portion of the inner slider 5b has a sliding rail 1 along the front-back direction, and this portion of the inner slider 5b is slidably connected to the core block 5a through the sliding rail 1 and the sliding groove 5a1. The remaining inner slider 5b has a sliding groove 2 along the front-back direction, and this portion of the inner slider 5b is slidably connected to the core block 5a through the sliding groove 2 and the sliding rail 5a2. Because the cross-section of the front portion of the core block 5a gradually decreases from back to front, and the sliding groove 5a1 and sliding rail 5a2 on the side of the front portion of the core block 5a are both inclined relative to the central axis of the core block 5a, when each inner slider 5b moves forward along the core block 5a, they simultaneously contract inward, thus creating a gap between each inner slider 5b and the inner wall of the through hole 4a1. In this embodiment, there are four sliding grooves 5a1 and four sliding rails 5a2, and eight inner sliders 5b. Figure 7 , Figure 8 , Figure 10 and Figure 11 As shown, the moving mold 4 is provided with a plurality of air blowing pipes 9 and a plurality of air blowing holes 4b2. Each air blowing pipe 9 and each air blowing hole 4b2 is located behind the through hole 4a1 and is distributed circumferentially along the through hole 4a1. After the moving mold 4 drives each inner slider 5b to move forward, air can be blown into the gap formed between each inner slider 5b and the inner wall of the through hole 4a1 through each air blowing pipe 9 and each air blowing hole 4b2. The number of air blowing pipes 9 is consistent with the number of inner sliders 5b. The air blowing pipes 9 and the inner sliders 5b are spaced apart circumferentially. There is a clearance between the rear end sidewalls of every two adjacent inner sliders 5b. Each air blowing pipe 9 is located within each clearance. The air outlet end of each air blowing pipe 9 is forward-facing. After each inner slider 5b moves forward, the air outlet end of each air blowing pipe 9 is opposite to the gap formed between each inner slider 5b and the inner wall of the through hole 4a1. The number of each air-blowing hole 4b2 is also consistent with that of the inner slider 5b. Each air-blowing hole 4b2 and the inner slider 5b are arranged circumferentially. Each air-blowing hole 4b2 is located within each clearance distance. After each inner slider 5b moves forward, each air-blowing hole 4b2 is also opposite to the gap generated between each inner slider 5b and the inner wall of the through hole 4a1.

[0044] like Figure 8 , Figure 9 and Figure 10As shown, the moving mold 4 is also provided with an air inlet pipe 10 and an annular air passage pipe 11. The air passage pipe 11 is located on the outer side of the rear end of each inner slider 5b. Each air blowing pipe 9 is L-shaped. The air inlet end of each air blowing pipe 9 is fixed to the inner side of the air passage pipe 11 and each air blowing pipe 9 is connected to the air passage pipe 11. One end of the air inlet pipe 10 is fixed to the air passage pipe 11 and forms a connection. The other end of the air inlet pipe 10 extends out of the moving mold 4. The side wall of the cavity 4a2 is provided with several relief grooves 4a3 along the circumferential direction. Each air blowing pipe 9 passes through each relief groove 4a3 to the cavity 4a2. Specifically, the rear end of the front mold base 4a is provided with an annular mounting groove 4a4 and a straight mounting groove 4a5. The mounting groove 4a5 is connected to the mounting groove 4a4 and the mounting groove 4a4 penetrates the side wall of the front mold base 4a. The air pipe 11 is located in the mounting groove 4a4, the air inlet pipe 10 is located in the mounting groove 4a5, the cavity 4a2 is located inside the mounting groove 4a4, and each clearance groove 4a3 is connected to the mounting groove 4a4.

[0045] In addition, such as Figure 7 , Figure 11 and Figure 13 As shown, the rear support plate 4b has an air blowing channel 4b1 inside. The inlet of the air blowing channel 4b1 is located on the side wall of the rear support plate 4b. Each air blowing hole 4b2 is located at the front end of the rear support plate 4b. Each air blowing hole 4b2 is connected to the air blowing channel 4b1. Each air blowing hole 4b2 is located between the rear ends of each pair of adjacent inner sliders 5b. After each inner slider 5b moves forward, each air blowing hole 4b2 is opposite to the gap formed between each inner slider 5b and the inner wall of the through hole 4a1.

[0046] In the mold closed state, such as Figure 2 As shown, a cavity 6 is formed between the fixed mold 1, the front mold base 4a, and the inner core 5. Molten metal is injected into the cavity 6 through the sprue 1a, and after cooling, a box-shaped product is formed. Then, as... Figure 3 As shown, the moving mold assembly 2 is moved away from the fixed mold 1 (specifically, the entire moving mold assembly 2 can be placed on a guide frame, and the movement of the entire moving mold assembly 2 is achieved by moving the guide frame). This action is mold opening. After the moving mold assembly 2 separates from the fixed mold 1, the resulting product is still attached to the inner sliders 5b of the inner core 5, making the product impossible to remove directly. Next, the demolding action is performed, driving the moving mold 4 to move forward relative to the base 3. At this time, the moving mold 4 will drive the inner sliders 5b in the core of the mold 4 to move forward and retract inward along the core block 5a in the inner core 5. As the inner sliders 5b retract inward, the product can be removed. This state is as follows. Figure 12 and Figure 13As shown. Molten metal is injected into cavity 6 at high speed, generating significant pressure during injection. This inevitably causes the molten metal injected into cavity 6 to be squeezed between the inner sliders 5b and the inner wall of the through hole 4a1, forming burrs after cooling. To address this, the mold incorporates a clearance gap between the rear end sidewalls of every two adjacent inner sliders 5b, and a number of air pipes 9, matching the number of inner sliders 5b, are installed in the moving mold 4. Each air pipe 9 is located behind the through hole 4a1, within its respective clearance gap, and with its exhaust end facing forward. When the inner sliders 5b are in an inward contraction state, the outer side of each inner slider 5b and the inner wall of the through hole 4a1 at the front end of the moving mold 4 will... Figure 13 As shown, a gap is formed, and the air outlet end of each air blowing pipe 9 is exactly facing this gap. In this way, after the worker removes the product, air can be introduced into the air inlet pipe 10. The gas enters the air passage pipe 11 through the air inlet pipe 10 and is finally sprayed out through each air blowing pipe 9 into the gap formed between the outer side of each inner slider 5b and the inner wall of the through hole 4a1. This blows out the burrs formed between each inner slider 5b and the position on the moving mold 4 where the front end of the inner core 5 passes through, thereby ensuring the accuracy when the mold is closed again and ensuring product quality.

[0047] In addition, while air is being introduced into the air inlet pipe 10, air can also be introduced into the air blowing channel 4b1 located in the rear support plate 4b. After the air enters the air blowing channel 4b1, it will be distributed into each air blowing hole 4b2 located at the front end of the rear support plate 4b. Since each air blowing hole 4b2 is located between the rear ends of each pair of adjacent inner sliders 5b, and each air blowing hole 4b2 faces the part of the moving mold 4 through which the front end of the inner core 5 passes, the air blown out from each air blowing hole 4b2 can also be sprayed into the gap formed between each inner slider 5b and the inner wall of the through hole 4a1. At this time, it is equivalent to the air blowing pipe 9 and the air blowing hole 4b2 blowing air at the same time, which can increase the blowing force and blowing volume, thereby greatly improving the cleaning effect on the burrs formed between each inner slider 5b and the inner wall of the through hole 4a1.

[0048] Example 2

[0049] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the air outlet end of the air blowing pipe 9 is a flat, wide-mouth shape.

[0050] Example 3

[0051] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the moving mold 4 is provided with only a few air blowing pipes 9 and no air blowing holes 4b2, or the moving mold 4 is provided with only a few air blowing holes 4b2 and no air blowing pipes 9.

[0052] Example 4

[0053] This embodiment is basically the same as the first embodiment in terms of structure and principle, except that: in this embodiment, the moving mold 4 includes a front mold base 4a and a rear support plate 4b fixedly connected to the rear end of the front mold base 4a. The front end of the front mold base 4a is provided with a through hole 4a1, and the rear end of the front mold base 4a is provided with a cavity 4a2 that communicates with the through hole 4a1. The outer side of the rear end of each slider has a protruding edge 5b1, which abuts against the bottom wall of the rear support plate 4b and the cavity 4a2. The air blowing pipe 9 is L-shaped. The rear end of the front mold base 4a is provided with a number of mounting straight grooves that are the same as and correspond one-to-one with the air blowing pipes 9. Each mounting straight groove passes through the side wall of the front mold base 4a and is connected to the cavity 4a2. The air inlet end of each air blowing pipe 9 extends out to the outside of the side wall of the front mold base 4a through the corresponding mounting straight groove, and the air outlet end of each air blowing pipe 9 passes through the relief groove 4a3 into the cavity 4a2.

[0054] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A mold comprising a fixed mold (1) and a moving mold assembly (2), wherein the moving mold assembly (2) comprises a base (3), a moving mold (4) capable of moving forward relative to the base (3) and having a through hole (4a1) at its front end, and an inner core (5) having its front end extending through the through hole (4a1), wherein after mold closing, a cavity (6) is formed between the fixed mold (1), the moving mold (4), and the inner core (5), wherein the inner core (5) comprises a core block (5a) fixed to the base (3) and a plurality of inner sliders (5b) surrounding the side of the core block (5a), wherein when the moving mold (4) moves forward relative to the base (3), it can drive each inner slider (5b) to move forward, and each inner slider (5b) will contract inward when moving forward, creating a gap between each inner slider (5b) and the inner wall of the through hole (4a1), characterized in that, The moving mold (4) is provided with a plurality of air blowing pipes (9) and / or a plurality of air blowing holes (4b2). Each air blowing pipe (9) and each air blowing hole (4b2) is located behind the through hole (4a1). Each air blowing pipe (9) and / or each air blowing hole (4b2) is distributed along the circumference of the through hole (4a1). After the moving mold (4) drives each inner slider (5b) to move forward, air can be blown into the gap formed between each inner slider (5b) and the inner wall of the through hole (4a1) through each air blowing pipe (9) and / or each air blowing hole (4b2).

2. The mold according to claim 1, characterized in that, There is a clearance between the rear end sidewalls of each pair of adjacent inner sliders (5b), and each air pipe (9) and / or each air hole (4b2) is located within the clearance. The air outlet end of each air pipe (9) and / or each air hole (4b2) is opposite to the gap formed between the inner slider (5b) and the inner wall of the through hole (4a1) after each inner slider (5b) slides forward.

3. The mold according to claim 2, characterized in that, The moving mold (4) is also provided with an air inlet pipe (10) and an annular air passage pipe (11). The air passage pipe (11) is located on the outer side of the rear end of each inner slider (5b). Each air blowing pipe (9) is L-shaped. One end of the air inlet of each air blowing pipe (9) is fixed to the inner side of the air passage pipe (11) and each air blowing pipe (9) is connected to the air passage pipe (11). One end of the air inlet pipe (10) is fixed to the air passage pipe (11) and forms a connection. The other end of the air inlet pipe (10) is located outside the moving mold (4).

4. A mold according to claim 3, characterized in that, The moving mold (4) includes a front mold base (4a) and a rear support plate (4b) fixedly connected to the rear end of the front mold base (4a). A through hole (4a1) is provided at the front end of the front mold base (4a). A cavity (4a2) communicating with the through hole (4a1) is provided at the rear end of the front mold base (4a). Each inner slider (5b) has a raised edge (5b1) on the outer side of its rear end. The raised edge (5b1) abuts against the bottom wall of the rear support plate (4b) and the cavity (4a2). The side wall of the cavity (4a2) is provided with several relief grooves (4a3) along the circumferential direction. Each air blowing pipe (9) passes through each relief groove (4a3) to the cavity (4a2).

5. A mold according to claim 4, characterized in that, The rear end of the front mold base (4a) is also provided with an annular mounting groove 1 (4a4) and a straight mounting groove 2 (4a5). The mounting groove 2 (4a5) is connected to the mounting groove 1 (4a4) and the mounting groove 2 (4a5) penetrates the side wall of the front mold base (4a). The air pipe (11) is set in the mounting groove 1 (4a4), the air inlet pipe (10) is set in the mounting groove 2 (4a5), the cavity (4a2) is located inside the mounting groove 1 (4a4), and each clearance groove (4a3) is connected to the mounting groove 1 (4a4).

6. A mold according to claim 2, characterized in that, The moving mold (4) includes a front mold base (4a) and a rear support plate (4b) fixedly connected to the rear end of the front mold base (4a). The front end of the front mold base (4a) is provided with a through hole (4a1), and the rear end of the front mold base (4a) is provided with a cavity (4a2) communicating with the through hole (4a1). The outer side of the rear end of each slider has a protruding edge (5b1), which abuts against the bottom wall of the rear support plate (4b) and the cavity (4a2). (9) is L-shaped. The rear end of the front mold base (4a) is provided with a number of mounting straight grooves that are the same as and correspond one-to-one with the air blowing pipes (9). Each mounting straight groove passes through the side wall of the front mold base (4a) and each mounting straight groove is connected to the cavity (4a2). The air inlet end of each air blowing pipe (9) extends out to the outside of the side wall of the front mold base (4a) through the corresponding mounting straight groove, and the air outlet end of each air blowing pipe (9) passes through each relief groove (4a3) to the cavity (4a2).

7. A mold according to claim 2, characterized in that, The air outlet end of the air blowing pipe (9) is flat and wide-mouthed.

8. A mold according to claim 4 or 6, characterized in that, The rear support plate (4b) is provided with an air blowing channel (4b1) inside. The inlet of the air blowing channel (4b1) is located on the side wall of the rear support plate (4b). Each air blowing hole (4b2) is located at the front end of the rear support plate (4b). Each air blowing hole (4b2) is connected to the air blowing channel (4b1). Each air blowing hole (4b2) is located between the rear ends of every two adjacent inner sliders (5b).

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