Combined insert structure aiming at incapable of demolding in-pipe structure

Abstract

The utility model relates to the technical field of metal casting molding, and particularly discloses a combined insert structure aiming at the problem that a structure in a pipe cannot be demolded, which comprises at least two movable inserts matched on a loose core in a concave-convex manner during die-casting molding, the thickness size of each movable insert is smaller than the distance between the end face of the pipe opening of the product and the blocking rib of the product, and the section size of the movable insert farther from the blocking rib is smaller. The scheme is used for solving the problem that in a traditional die-casting forming process, due to the fact that the middle aperture in a pipe is small and blocking ribs exist at the front end of a pipe opening, demolding cannot be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal casting and forming, and particularly relates to a combined insert structure for a pipe internal structure that cannot be demolded. Background Art

[0002] When manufacturing metal parts by die-casting forming process, it is usually necessary to use a mold to form a cavity, and the molten metal fills the cavity and forms the required parts after cooling. Die-casting forming is widely used due to its high forming speed and low material waste.

[0003] However, for some parts with complex internal structures, such as parts with the smallest inner diameter of the pipe internal structure located in the middle section and having a blocking rib at the front end of the pipe orifice (as Figures 1 to 3 shown), it is difficult to achieve effective demolding by traditional die-casting methods. Specifically, due to the small middle diameter of such parts, no matter which direction the core is withdrawn, it will be blocked by the structure of the product itself, and thus cannot be directly demolded. Even if cores are designed at both axial ends and the two cores are tried to move in opposite directions, demolding cannot be achieved due to the existence of the blocking rib. This results in such parts being unable to be produced by traditional die-casting forming process.

[0004] For pipe internal structures with low dimensional accuracy requirements, the method of inserting a salt core can be adopted. The salt core is installed on a core that can be demolded, and after die-casting forming, the salt core is dissolved to obtain the product. However, the size of the salt core changes greatly after being affected by temperature, and it is difficult to ensure the accuracy and consistency of the product. Therefore, for pipe internal structures with high dimensional accuracy requirements, this method is still not feasible, and subsequent processing is required to ensure dimensional accuracy, increasing the production cost.

[0005] In the prior art, attempts have been made to leave the movable insert inside the product and separately remove the insert after the product is formed. For example, a die-casting mold structure for external demolding disclosed in the patent publication number CN203804190U connects the movable insert to the core (specifically, the core on the core pull) in a concave-convex fit manner. After die-casting forming, the core is removed from the product, and the movable insert remains inside the product. The movable insert is separately removed after the product is taken out. Although this method can ensure the dimensional accuracy of the pipe internal structure of the product, for the situation where the pipe internal structure mentioned in this application Figure 1 has a blocking rib at the front end, the movable insert still cannot be removed, making such products still unable to be formed. Summary of the Utility Model

[0006] The utility model aims to provide a combined insert structure for a pipe internal structure that cannot be demolded, so as to solve the problem of inability to demold in the traditional die-casting forming process due to a small middle diameter inside the pipe and the existence of a blocking rib at the front end of the pipe orifice.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] A combined insert structure for a tube inner structure that cannot be demolded, including movable inserts that are fitted on the core-pulling mechanism in a concave-convex manner during die-casting. The number of movable inserts is at least two, and the thickness dimension of each movable insert is less than the distance between the end face of the product tube opening and the product blocking rib. The cross-sectional dimension of the movable insert farther away from the blocking rib is smaller.

[0009] The principle and advantages of this solution are as follows:

[0010] I. Method of using multiple movable inserts in combination:

[0011] Before the die-casting mold is closed, multiple movable inserts are sequentially sleeved on the core-pulling mechanism in order.

[0012] After the die-casting mold is closed to form a complete cavity, after the product is formed, the die-casting mold is opened, and the core-pulling mechanism is withdrawn from one end of the tube inner structure, while the movable inserts remain in the product.

[0013] Since the thickness of each movable insert is less than the distance between the tube end face and the blocking rib, a ejector rod can be inserted from the end where the core-pulling mechanism is withdrawn, and by knocking the ejector rod, the movable insert can be moved closer to the blocking rib, thereby realizing the scheme of sequentially removing the movable inserts from the area between the blocking rib and the tube opening.

[0014] Because the cross-sectional dimensions of the movable inserts decrease in sequence, when knocking the movable inserts in the direction towards the blocking rib, all the movable inserts can be quickly removed with only a small displacement.

[0015] II. Advantages of this solution: First, this solution adopts a combined design of movable inserts, ensuring the dimensional accuracy of the product tube inner structure and meeting high-precision requirements. Second, through the combined use of multiple movable inserts, this solution simplifies the demolding process and avoids the problem that the existing technology cannot achieve demolding.

[0016] Preferably, as an improvement, the movable insert closest to the blocking rib covers the end of the core-pulling mechanism, and the remaining movable inserts are all sleeved on the core-pulling mechanism. The core-pulling mechanism is provided with shoulders for restricting the sleeving position of the movable inserts to facilitate the installation and position limitation of the movable inserts on the core-pulling mechanism.

[0017] Preferably, as an improvement, the core-pulling mechanism adopts a stepped shaft structure to facilitate the formation of shoulders and the processing of the core-pulling mechanism.

[0018] Preferably, as an improvement, a cooling cavity is provided in the core-pulling mechanism, and cooling water can be introduced into the cooling cavity to facilitate timely cooling of the area where the movable inserts are located during die-casting to ensure the product quality.

[0019] Preferably, as an improvement, one section of the movable insert of the core-pulling set has a special-shaped cross-section.

[0020] Preferably, as an improvement, the core-pulling is fixed on the slider of the die-casting mold.

[0021] Preferably, as an improvement, the movable insert is a metal insert. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structure diagram of the product targeted by the present utility model.

[0023] Figure 2 It is Figure 1 the top view of

[0024] Figure 3 It is Figure 1 the top view sectional view of

[0025] Figure 4 It is Figure 1 the three-dimensional structure diagram after inserting the combined insert structure of the embodiment of the present utility model into

[0026] Figure 5 It is Figure 4 the top view sectional view of

[0027] Figure 6 It is Figure 4 the A-A sectional view of

[0028] Figure 7 It is the three-dimensional structure diagram of the combined insert structure of the embodiment of the present utility model when the movable insert is in an exploded state.

[0029] Figure 8 It is Figure 7 the three-dimensional structure diagram after adjusting the angle.

[0030] Figure 9 It is the schematic diagram when the movable insert in the product is removed in the embodiment of the present utility model (in the figure, the movable insert on the left is pushed by the ejector rod into the area between the blocking rib and the pipe orifice end face). DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following is further detailed through specific embodiments:

[0032] The reference numerals in the accompanying drawings of the specification include: movable insert 1, groove 11, core-pulling 2, special-shaped cross-section section 21, cooling cavity 22, product 10, internal structure in the pipe 101, blocking rib 102, slider 3, ejector rod 4, pipe orifice end face 1011.

[0033] The embodiment is basically as shown in the attached Figures 4 to 9 figure.

[0034] A combined insert structure for the in - tube structure that cannot be demolded, including at least two movable inserts 1 sleeved on the core - pulling member 2. The thickness dimension of each movable insert 1 is less than the distance between the end face of the product 10 pipe opening and the product 10 blocking rib 102. The cross - sectional dimension of the movable insert 1 gradually decreases with the distance from the blocking rib 102, that is, the cross - sectional dimension of the movable insert 1 farther away from the blocking rib 102 is smaller. In this embodiment, an example is given where 3 movable inserts 1 are sleeved on the core - pulling member 2.

[0035] For the convenience of disassembling and assembling the movable insert 1 on the core - pulling member 2, the movable insert 1 closest to the blocking rib 102 is processed with a groove 11. The movable insert 1 is covered on the core - pulling member 2 through the groove 11, and the rest of the movable inserts 1 can be sleeved on the core - pulling member 2.

[0036] To ensure that the cavity formed after the movable insert 1 is sleeved on the core - pulling member 2 and the die - casting mold is closed meets the design requirements of the product 10, the core - pulling member 2 is designed as a stepped - shaft structure. The shoulder formed by the stepped - shaft structure of the core - pulling member 2 limits the axial movement of the movable insert 1, and the section of the core - pulling member 2 inserted into the movable insert 1 is a special - shaped section 21 with the smallest cross - section. The special - shaped cross - section is defined as non - circular, non - elliptical, and non - regular polygon in this embodiment. Specifically, it can be trapezoidal, or a combination of conventional shapes. For example, in this embodiment, it is a combination of a rectangle and a trapezoid to ensure the direction accuracy of the movable insert 1.

[0037] To improve the quality of die - casting forming, a cooling cavity 22 is provided in the core - pulling member 2. Cooling water can be introduced into the cooling cavity 22 to ensure that the area where the movable insert 1 is located can be cooled in time during die - casting forming, improving the product quality. The cooling cavity 22 can extend to the middle of all movable inserts 1.

[0038] Both the core - pulling member 2 and the movable insert 1 are made of metal materials.

[0039] The core - pulling member 2 is fixed on the slider 3 of the die - casting mold. After die - casting forming, the driver (such as a cylinder) of the die - casting mold drives the slider 3 to move, thereby pulling out the core - pulling member 2 from the in - tube structure 101 of the product 10. Then, the die - casting mold is fully opened, facilitating the removal of the product 10 from the die - casting mold.

[0040] The usage method of this embodiment is as follows:

[0041] 1. Preparation before die - casting:

[0042] A plurality of movable inserts 1 are sequentially sleeved on the special - shaped cross - section of the core - pulling member 2 in order, and ensure that the position of each movable insert 1 is correct. The movable insert 1 closest to the blocking rib 102 covers the end of the core - pulling member 2.

[0043] 2. Die Casting Process: After the die-casting mold is closed, the combined insert structure and other components of the die-casting mold form a complete cavity for the formation of Product 10. The molten metal fills the cavity and forms the required parts of Product 10 after cooling. • A cooling cavity 22 is provided inside the core-pulling 2, and cooling water is introduced into the cooling cavity 22 to ensure that the area where the movable insert 1 is located can be cooled in time, improving the product quality.

[0044] 3. Die-Casting Mold Opening: First, let the core-pulling 2 move with the slider 3 so that the core-pulling 2 is withdrawn from the internal structure 101 of the tube of Product 10. The movable insert 1 remains in the internal structure 101 of the tube of Product 10. After the die-casting mold is fully opened, Product 10 with the movable insert 1 is taken out from the die-casting mold.

[0045] 4. Removing the Movable Insert 1: By inserting a ejector rod 4 from one end of the internal structure 101 of the tube from which the core-pulling 2 is withdrawn from the product, the ejector rod 4 pushes against the movable insert 1 that is farthest from the blocking rib 102 (i.e., Figure 5 the rightmost movable insert 1 in the figure). By hitting the ejector rod 4, all the movable inserts 1 are moved closer to the blocking rib 102, so as to sequentially remove the movable inserts 1 from the area between the blocking rib 102 and the pipe orifice end face 1011 (after the leftmost movable insert 1 falls into the area between the blocking rib and the pipe orifice, after removing one movable insert 1, then use the ejector rod 4 to push the remaining movable inserts 1 so that the remaining movable inserts 1 sequentially enter the area between the blocking rib 102 and the pipe orifice end face 1011, completing the sequential removal of the movable inserts 1).

[0046] Advantages of this Embodiment:

[0047] 1. The combined design of the movable insert 1 ensures the dimensional accuracy of the internal structure 101 of the tube of Product 10, meeting the high-precision requirements.

[0048] 2. By using a combination of multiple movable inserts 1, the situation where die-casting forming of such structures cannot be demolded in the prior art is broken, and the removal of the movable insert 1 is simple and convenient.

[0049] 3. The cooling cavity 22 is provided inside the core-pulling 2 in this embodiment, and cooling water can be introduced to ensure that the area where the movable insert 1 is located can be cooled in time during die-casting forming, improving the product quality.

[0050] The above are only the embodiments of the present utility model, and common general technical solutions and / or characteristics and the like well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A combined insert structure for a non-demoldable structure inside a pipe, comprising a movable insert that is fitted to a core-pulling mechanism in a concave-convex manner during die casting, characterized in that: The number of the movable inserts is at least two, and the thickness dimension of each movable insert is smaller than the distance between the end face of the product pipe orifice and the product blocking rib, and the cross-sectional dimension of the movable insert farther away from the blocking rib is smaller.

2. The combined insert structure for the in-tube structure that cannot be demolded according to claim 1, characterized in that: The movable insert closest to the blocking rib covers the end of the core-pulling, and the remaining movable inserts are all sleeved on the core-pulling, and shoulders for restricting the sleeving position of the movable inserts are provided on the core-pulling.

3. The combined insert structure according to claim 2 for the in-tube structure that cannot be demolded, characterized in that: The core-pulling adopts a stepped shaft structure.

4. The combined insert structure for the in-tube structure that cannot be demolded according to any one of claims 2-3, characterized in that: A cooling cavity is arranged in the core-pulling, and cooling water can be introduced into the cooling cavity.

5. The combined insert structure for the in-tube structure that cannot be demolded according to any one of claims 2-3, characterized in that: The section of the core-pulling where the movable inserts are sleeved is of a special-shaped cross-section.

6. The combined insert structure for the in-tube structure that cannot be demolded according to any one of claims 2-3, characterized in that: The core-pulling is fixed on the slide block of the die-casting mold.

7. The combined insert structure for the in-tube structure that cannot be demolded according to any one of claims 2-3, characterized in that: The movable insert is a metal insert.

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