Design device for eliminating burrs in through holes of die castings

Abstract

The utility model discloses a die casting part through -hole inner burr free design device relates to die casting technical field, including movable mould insert, slidably set up on movable mould core, when die casting mould opens, and movable mould insert forms the floating gap of predetermining between the limiting groove of movable mould core, static mould insert, fixed mounting is on static mould core, when die casting mould closes and cooperates with movable mould insert contact, limiting support column subassembly, including integral mould support body and support column, wherein support column diameter is less than support body diameter, and support column is located above movable mould insert and keeps non -contact state, limiting spring, the sleeve is installed on support column periphery, its upper end and support body lower end surface contact, and lower extreme and movable mould insert upper surface keep elastic contact. The device adopts insert structure forming product's small hole and special -shaped hole, and sets up limiting spring in movable mould insert bottom, ensures when still can keep the close closure of hole area when the lock -on mode force is deficient, effectively eliminates the burr problem in hole.

Description

Technical Field

[0001] This utility model relates to the field of die casting technology, specifically to a device for designing burr-free through holes in die castings. Background Technology

[0002] During die casting, the mold experiences complex mechanical and thermal stresses due to the impact of high-pressure molten metal and cyclic thermal cycling. Specifically, at the moment of injection, the dynamic balance between the pressure peak and the clamping force is disrupted, resulting in a momentary micron-level gap at the parting surface. Simultaneously, the thermal expansion difference caused by the mold temperature fluctuating from its operating temperature of 180-300℃ to room temperature further exacerbates the unintended separation of the parting surface. The combined effect of these factors causes molten metal to penetrate the mold's mating gaps, forming burrs and flash on the parting surface and the edges of the hole structures on the product.

[0003] Traditional deburring methods have significant limitations. Manual grinding: For regular external surface burrs, skilled workers need 2-5 minutes per piece, and there is a risk of uneven grinding leading to dimensional deviations. Mechanical deburring: Hydraulic edge trimming machines require additional investment, and the cost of tool wear is high. In addition, it is difficult to access burrs inside small-diameter through holes, and the burr residue rate is high at the corners of irregularly shaped holes (such as oblong holes and polygonal holes).

[0004] Therefore, the current pain point in the industry is that existing mold designs (such as conventional slider + core structures) cannot fundamentally suppress burr generation, while subsequent processing faces a contradiction between efficiency and cost. Utility Model Content

[0005] The purpose of this invention is to provide a burr-free design device for through holes in die-cast parts, which can fundamentally solve the technical problem of burrs in through holes with small diameters in die-cast parts, improve product quality, and reduce production costs.

[0006] To achieve the above objectives, this application proposes a burr-free design device for through holes in die-cast parts, comprising:

[0007] The moving mold insert is slidably mounted on the moving mold core. When the die-casting mold is opened, a preset floating gap is formed between the moving mold insert and the limiting groove of the moving mold core.

[0008] The stationary mold insert is fixedly installed on the stationary mold core; it comes into contact with the moving mold insert when the die-casting mold is closed.

[0009] The limiting support assembly includes an integrally molded support body and a support column, wherein the diameter of the support column is smaller than the diameter of the support body, and the support column is located above the moving mold insert and remains in a non-contact state.

[0010] The limiting spring is fitted around the outer periphery of the support column. Its upper end contacts the lower end face of the support column body, and its lower end maintains elastic contact with the upper surface of the moving mold insert.

[0011] In one embodiment, the moving mold core is fixedly mounted on the moving mold frame by fastening screws, and the moving mold frame forms a rigid connection structure with the mold base plate through mold legs.

[0012] In one embodiment, two closely fitted nut assemblies are vertically mounted on the moving mold frame, including an upper first nut and a lower second nut, which are coaxially arranged to form a double limiting structure for controlling the stroke range of the limiting support assembly.

[0013] In one embodiment, a mold ejector base plate and a mold ejector plate are sequentially arranged between the mold base plate and the moving mold frame. The mold ejector base plate, the mold ejector plate and the mold base plate are all machined with coaxially aligned insert removal through holes.

[0014] In one embodiment, the top of the moving mold insert is machined with a first threaded removal hole, the central axis of which is completely coincident with the central axis of the mold ejector plate, the mold ejector plate and the insert removal through hole on the mold base plate.

[0015] In one embodiment, the top of the support body is machined with a second screw hole for removal, the central axis of which is completely coincident with the central axis of the mold ejector plate, the mold ejector plate and the insert removal through hole on the mold base plate.

[0016] In one embodiment, when replacing the moving mold insert, the long screw rod passes through the mold base plate, the mold ejector plate, and the insert removal through hole and the first threaded removal hole on the mold ejector plate in sequence and is tightened to remove the limiting support assembly.

[0017] In one embodiment, when replacing the moving mold insert, the long screw rod passes through the mold base plate, the mold ejector plate, and the insert removal through hole and the second threaded removal hole on the mold ejector plate in sequence and is tightened to remove the moving mold insert.

[0018] In one embodiment, the ejector pin fixed to the mold ejector plate passes through the mold ejector plate, the moving mold frame and the moving mold core in sequence.

[0019] In one embodiment, both the moving model core and the static model core are provided with water channels.

[0020] Compared with the prior art, the above technical solution adopted by this utility model has the following advantages: This device uses an insert structure to form small holes and irregular holes on the product, and sets a limiting spring at the bottom of the moving mold insert to ensure that the hole area can still be tightly closed when the clamping force is insufficient, effectively eliminating the problem of burrs in the hole. It is particularly suitable for the production of precision die castings with strict requirements for hole quality.

[0021] When replacing the moving mold insert, the limit support assembly and the moving mold insert are removed sequentially using a long screw rod, effectively avoiding the problem of inserts easily falling into the mold gaps in the traditional method. This design makes the replacement operation process simpler and more reliable, shortens the replacement time, improves production efficiency, and significantly reduces the risk of mold damage caused by inserts falling off. Attached Figure Description

[0022] Figure 1 Schematic diagram of a device designed to eliminate burrs inside through holes of die-cast parts;

[0023] Figure 2 Partial schematic diagram of a device designed to eliminate burrs inside through holes of die-cast parts;

[0024] Figure 3 Partial exploded view of the device designed to eliminate burrs inside the through holes of die-cast parts;

[0025] The components are: 1. Main channel; 2. Fastening screw; 3. Mold support leg; 4. Mold base plate; 5. Mold ejector pin base plate; 6. Mold ejector pin plate; 7. Water channel; 8. Ejector rod; 9. Moving mold frame; 10. Moving mold core; 11. Static mold core; 12. Static mold frame; 13. Die casting part; 14. Static mold insert; 15. Small hole or irregular hole; 16. Moving mold insert; 17. Floating clearance; 18. Limiting spring; 19. Support body; 20. Second nut. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise expressly specified. "Several" means one or more, unless otherwise expressly specified.

[0029] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Please see Figure 1-3 This embodiment provides a burr-free design device for through holes in die-cast parts, including:

[0032] The moving mold insert is slidably mounted on the moving mold core, forming a preset floating gap with the limiting groove when the mold is opened; a first threaded removal hole is provided on the top of the moving mold insert for easy removal during replacement.

[0033] The static mold insert is fixedly installed on the static mold core and fits precisely with the moving mold insert during mold closing to ensure no gap contact.

[0034] The limiting support assembly includes an integrally molded support body and a support column, with the diameter of the support column being smaller than that of the support body; the support column is located above the moving mold insert, maintaining a non-contact state to avoid interfering with the floating motion; the top of the support body is provided with a second threaded removal hole for easy disassembly and replacement.

[0035] The limit spring is fitted around the outer periphery of the support column, with its upper end abutting against the column body and its lower end elastically pressing against the moving mold insert to ensure a tight fit when the mold is closed.

[0036] It should be noted that the ejector pin is fixed to the ejector plate of the mold, passes through the ejector plate of the mold, the moving mold frame and connects to the moving mold core. Both the moving mold core and the stationary mold core are equipped with cooling water channels to optimize mold temperature control.

[0037] In this embodiment, the moving mold core is fixed to the moving mold frame by fastening screws, and the moving mold frame is rigidly connected to the mold base plate via mold support legs. The stationary mold core is fixed to the stationary mold frame by fastening screws.

[0038] In this embodiment, the moving mold frame is provided with a double nut assembly, namely a first nut and a second nut, which are coaxially arranged to precisely control the stroke of the limit support.

[0039] In this embodiment, the mold base plate, the mold ejector base plate, and the mold ejector plate are all provided with coaxially aligned insert removal through holes;

[0040] The working principle of the above device is as follows:

[0041] During the mold closing process, the stationary mold insert pushes the moving mold insert to reset, and the limit spring continuously applies pressure to ensure that the two inserts fit tightly together without any gaps, ensuring that the inner wall of the through hole is smooth and burr-free. The double nut assembly limits the stroke of the support column to prevent overpressure or loosening.

[0042] During the mold opening process, the moving mold insert floats up under the action of the limiting spring, above the parting surface inside the hole, and will detach even if there are burrs.

[0043] The above-mentioned method for replacing the moving mold insert is as follows: unscrew the double nut assembly, and then pass the long screw rod sequentially through the insert removal through hole and the first threaded removal hole on the mold base plate, the mold ejector plate, and the mold ejector plate to remove the limiting support assembly. Next, pass the long screw rod through the insert removal through hole and the second threaded removal hole on the mold base plate, the mold ejector plate, and the mold ejector plate again to remove the moving mold insert. This method prevents the insert from falling into the mold gaps and improves replacement efficiency.

[0044] The advantage of this implementation is that the molten metal flows in from the main channel, the moving mold insert and the stationary mold insert always maintain a tight fit, and no burrs are generated in the through hole; the coaxial design of the threaded take-out hole and the through hole makes the insert replacement convenient and reduces downtime.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A burr-free design device for through holes in die-cast parts, characterized in that, include: The moving mold insert is slidably mounted on the moving mold core. When the die-casting mold is opened, a preset floating gap is formed between the moving mold insert and the limiting groove of the moving mold core. The stationary mold insert is fixedly installed on the stationary mold core; it comes into contact with the moving mold insert when the die-casting mold is closed. The limiting support assembly includes an integrally molded support body and a support column, wherein the diameter of the support column is smaller than the diameter of the support body, and the support column is located above the moving mold insert and remains in a non-contact state. The limiting spring is fitted around the outer periphery of the support column. Its upper end contacts the lower end face of the support column body, and its lower end maintains elastic contact with the upper surface of the moving mold insert.

2. The burr-free design device for through holes in die-cast parts according to claim 1, characterized in that, The moving mold core is fixedly installed on the moving mold frame by fastening screws. The moving mold frame forms a rigid connection structure with the mold base plate through mold support legs.

3. The burr-free design device for through holes in die-cast parts according to claim 2, characterized in that, The moving mold frame is vertically fitted with two closely fitted nut assemblies, including an upper first nut and a lower second nut, which are coaxially arranged to form a double limiting structure to control the stroke range of the limiting support assembly.

4. The burr-free design device for through holes in die-cast parts according to claim 2, characterized in that, A mold ejector base plate and a mold ejector plate are sequentially arranged between the mold base plate and the moving mold frame. The mold ejector base plate, the mold ejector plate and the mold base plate are all machined with coaxially aligned insert removal through holes.

5. The burr-free design device for through holes in die-cast parts according to claim 4, characterized in that, The top of the moving mold insert is machined with a first threaded extraction hole, the central axis of which is completely coincident with the central axis of the mold ejector plate, the mold ejector plate and the insert extraction through hole on the mold base plate.

6. The burr-free design device for through holes in die-cast parts according to claim 4, characterized in that, The top of the support body is machined with a second screw hole for removal. The central axis of this hole is completely coincident with the central axis of the mold ejector plate, the mold ejector plate, and the insert removal through hole on the mold base plate.

7. The burr-free design device for through holes in die-cast parts according to claim 5, characterized in that, When replacing the moving mold insert, the long screw rod passes through the insert removal through hole and the first threaded removal hole on the mold base plate, the mold ejector base plate, and the mold ejector plate in sequence, and is tightened to remove the limit support assembly.

8. The burr-free design device for through holes in die-cast parts according to claim 1, characterized in that, When replacing the moving mold insert, the long screw rod passes through the insert removal through hole and the second threaded removal hole on the mold base plate, the mold ejector plate, and the mold ejector plate in sequence and is tightened to remove the moving mold insert.

9. The burr-free design device for through holes in die-cast parts according to claim 1, characterized in that, The ejector pins fixed to the base plate of the mold ejector pin pass through the mold ejector pin plate, the moving mold frame and the moving mold core in sequence.

10. The burr-free design device for through holes in die-cast parts according to claim 1, characterized in that, Both the moving model core and the static model core are equipped with water channels.

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