A high-precision and high-stability pin structure and a die-casting die comprising the same

Abstract

This utility model discloses a high-precision and high-stability insert structure and a die-casting mold including the same. The insert structure includes an insert and a mold core, which together constitute the main structure of this high-precision and high-stability insert structure. Specifically, the mold core has a cavity for molding the product, and the outer wall of the mold core has a mounting hole that extends through the cavity. The insert is inserted into the cavity through this mounting hole. In this application, the insert is not only positioned by a cup head but also by abutting against the mold core through a protruding structure, thus achieving more stable positional accuracy compared to traditional insert structures. Furthermore, the contact surface between the insert and the mold core is transferred to the top of the protruding structure. Even if subsequent defects such as burrs and flash occur, these defects do not occur on the reference surface formed at the end of the insert, reducing the impact of die-casting defects on the reference surface. This utility model relates to the field of mold structure technology.

Description

Technical Field

[0001] This utility model relates to the field of mold structure technology, and in particular to a high-precision and high-stability insert structure and a die-casting mold including the same. Background Technology

[0002] In the current die-casting mold manufacturing industry, when areas requiring high-precision installation need to be formed, these areas typically require insert structures to ensure product stability. These reference inserts are indispensable key components in the mold. Their main function is to precisely construct the internal cavities, specific holes, or irregular structures of the product, directly affecting the dimensional accuracy and structural integrity of the formed product.

[0003] Before die casting, a reference pin is inserted into the mold core. The end of the reference pin can penetrate deep into the mold core, while its tip protrudes from the inner wall of the mold core. A wider cup-shaped head is provided at the tail end, which engages with a pre-drilled mounting groove on the outer wall of the mold core, thus limiting the axial position of the pin. During the subsequent die casting process, a high-temperature, high-pressure liquid working fluid is filled into the mold core. The inner wall of the mold core and the tip of the reference pin work together to assist the working fluid in solidification and molding.

[0004] However, in actual operation, due to the high temperature and pressure environment inside the mold core, the insert may experience slight axial displacement under external force, leading to insufficient forming accuracy and positioning errors on the reference surface of this part of the workpiece. Moreover, at the junction of the insert tip and the inner wall of the mold core, the working fluid is prone to accumulate or become insufficient, which can easily cause quality defects such as burrs and flash during demolding. This directly damages the flatness and coordinate accuracy of the reference surface, causing a chain reaction that affects the overall dimensional stability of the product. Utility Model Content

[0005] This invention aims to at least solve one of the aforementioned technical problems existing in the prior art. To this end, this application proposes a high-precision and high-stability insert structure, which can improve the positioning stability of the insert during the die-casting process, and the product reference surface obtained by forming the insert tip has better flatness and coordinate accuracy.

[0006] This application also proposes a die-casting mold with the aforementioned high precision and high stability needle-insertion structure.

[0007] The high-precision and high-stability pin structure according to the first aspect of this application includes: A pin includes a rod and a cup head. The rod extends from a first end to a second end along its length. The first end of the rod has an annular protrusion that surrounds a recessed structure. The cup head is located at the second end of the rod, and the outer diameter of the cup head is larger than the outer diameter of the rod. The mold core has a connected mounting hole and a forming cavity. The mounting hole allows the rod of the insert pin to be inserted. The cup head abuts against the opening of the mounting hole. A step is provided at the junction of the forming cavity and the mounting hole. The protruding structure of the rod abuts against the step. The inner wall surface of the mold core is in contact with the inner wall surface of the protruding structure.

[0008] The high-precision and high-stability insert structure according to the embodiments of this application has at least the following beneficial effects: the insert not only limits the position through the cup head, but also limits the position through the abutment of the protruding structure with the mold core, thus having a more stable positional accuracy compared with the traditional insert structure; moreover, the contact surface between the insert and the mold core is transferred to the top of the protruding structure, so even if subsequent defects such as burrs and flash occur, these defects do not occur on the reference surface formed by the end of the insert, which can reduce the influence of die casting defects on the reference surface.

[0009] According to some embodiments of this application, a rounded corner or chamfer is provided between the inner wall surface of the protruding structure and the end face of the first end of the rod.

[0010] According to some embodiments of this application, the top end of the protrusion structure is provided with a rounded corner, and the step of the mold core has a contour adapted to the top end of the protrusion structure.

[0011] According to some embodiments of this application, a positioning groove is provided on the outer surface of the mold core, the positioning groove is connected to the mounting hole, and the cup head can be placed in the positioning groove.

[0012] According to some embodiments of this application, the side of the positioning groove that connects with the mounting hole is its bottom surface, the side of the cup head that connects with the rod is its top surface, and the bottom surface of the positioning groove and the top surface of the cup head abut against each other.

[0013] According to some embodiments of this application, both the rod and the cup of the insert are cylindrical structures, and the cup is coaxially arranged with the central axis of the rod.

[0014] According to some embodiments of this application, the protrusion structure is annular and disposed at the edge of the first end of the rod, and the central axis of the protrusion structure is coaxial with the central axis of the rod.

[0015] According to some embodiments of this application, the mounting hole of the mold core is a circular hole, and the inner wall of the mounting hole is in contact with the side wall of the rod.

[0016] The die-casting mold according to the second aspect of this application includes the aforementioned high-precision and high-stability insert structure.

[0017] According to some embodiments of this application, the die-casting mold further includes a mold blank, which is provided with a receiving groove capable of accommodating the mold core, and the inner wall of the mold blank can abut against the cup head to suppress the axial displacement of the insert.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The accompanying drawings are used to provide a further understanding of the technical solutions disclosed in this application and form part of the specification. They are used together with the embodiments disclosed in this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions disclosed in this application.

[0020] Figure 1 Cross-sectional view and enlarged partial view of a traditional pin-inlay structure; Figure 2 This is a cross-sectional view and a partial enlarged view of the pin structure with high precision and high stability according to the first aspect of this application; Figure 3 This is a cross-sectional view of a die-casting mold according to a second aspect embodiment of this application.

[0021] Reference numerals: 1'-Traditional insert, 2'-Traditional cup head, 3'-Traditional mold core, 4'-Reference surface, 100-Insert, 110-Ring, 111-Protruding structure, 120-Cup head, 200-Mold core, 210-Mounting hole, 220-Molding cavity, 221-Step, 230-Positioning groove, 300-Mold blank. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, 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.

[0024] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0026] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] In the current die-casting mold manufacturing industry, when areas requiring high-precision installation need to be formed, these areas typically require insert structures to ensure product stability. These reference inserts are indispensable key components in the mold. Their main function is to precisely construct the internal cavities, specific holes, or irregular structures of the product, directly affecting the dimensional accuracy and structural integrity of the formed product.

[0028] Reference Figure 1 Before die casting, a conventional insert 1' is first inserted into a conventional mold core 3'. The end of the conventional insert 1' extends deep into the conventional mold core 3', with its tip protruding from the inner wall of the conventional mold core 3'. The end face of the conventional insert 1' and the inner wall of the conventional mold core 3' together form the outer contour reference of the product. The tail of the conventional insert 1' is provided with a wider conventional cup head 2', which engages with a pre-reserved mounting groove on the outer wall of the conventional mold core 3', thereby limiting the axial position of the conventional insert 1'. During the subsequent die casting process, a high-temperature, high-pressure liquid working fluid is filled into the conventional mold core 3'. The inner wall of the conventional mold core 3' and the tip of the conventional insert 1' together assist the working fluid in solidification and forming.

[0029] However, in actual work, due to the high temperature and high pressure environment inside the traditional mold core 3', the traditional insert pin 1' may experience slight axial displacement under external force (refer to...). Figure 1The arrow direction in the image indicates that the datum surface 4' of this part of the workpiece has insufficient forming accuracy and positioning error. Moreover, at the junction of the top of the traditional insert 1' and the inner wall of the traditional mold core 3', the working fluid is prone to accumulate or be insufficient at this location. During demolding, quality defects such as burrs and flash are likely to occur, which directly damages the flatness and coordinate accuracy of the datum surface 4' and has a chain reaction effect on the overall dimensional stability of the product.

[0030] In this application, "burr" refers to some tiny protrusions or depressions on the surface of the die or punch, which cause the actual shape of the die to differ from the design drawing; "burr" refers to defects such as burrs and flash caused by engineering process defects, which are mainly manifested as excess material remaining on the edges or corners of the product.

[0031] In response, this application proposes a high-precision and high-stability insert structure. The insert not only limits the position through the cup head, but also achieves the limit through the abutment of the protruding structure against the mold core, thus having more stable positional accuracy than the traditional insert structure. Moreover, the contact surface between the insert and the mold core is transferred to the top of the protruding structure. Even if defects such as burrs and flash occur later, these defects will not occur on the reference surface formed by the end of the insert, which can reduce the influence of die casting defects on the reference surface.

[0032] In addition, this application also proposes a die-casting mold that includes the above-mentioned high-precision and high-stability insert structure.

[0033] Reference Figure 2 The high-precision and high-stability insert structure in the first aspect embodiment of this application includes an insert 100 and a mold core 200, which together constitute the main structure of the high-precision and high-stability insert structure. Specifically, the mold core 200 has a mold cavity for molding products, and the outer wall of the mold core 200 has a mounting hole 210 that can penetrate into the mold cavity. The insert 100 is inserted into the mold cavity through the mounting hole 210.

[0034] Specifically, the insert 100 includes a rod 110 and a cup 120. The rod 110 extends from a first end to a second end along its length. The edge of the first end of the rod 110 is provided with an annular protrusion 111, which surrounds a recessed structure. This recessed structure serves as a reference surface for molding the product. The cup 120 is located at the second end of the rod 110. The outer diameter of the cup 120 is larger than that of the rod 110, so that when the insert 100 is installed in the mold core 200, it can be limited by the larger cup, thus restricting the axial displacement of the insert 100.

[0035] The mold core 200 has a connected mounting hole 210 and a forming cavity 220. The mounting hole 210 allows the rod portion 110 of the insert pin 100 to be inserted, and the cup head 120 abuts against the opening of the mounting hole 210, thereby limiting the axial position of the insert pin 100. The forming cavity 220 is used to form a sealed space to complete the die casting of the product. A step 221 is provided at the junction of the mold core 200 and the mounting hole 210. The protruding structure 111 of the rod portion 110 can abut against the step 221, and the inner wall surface of the mold core 200 can contact the inner wall surface of the protruding structure 111.

[0036] Therefore, not only can the axial position of the insert pin 100 be positioned by the contact between the cup head 120 and the mounting hole 210, but it can also be positioned by the contact between the protrusion structure 111 at the end of the insert pin 100 and the step 221 of the mold core 200, achieving the effect of positioning at both ends and improving the positional stability of the insert pin 100. Furthermore, the contact point between the protrusion structure 111 and the step 221 is located on the side of the product, rather than the end face traditionally used as a reference surface. This design avoids the impact of burrs and flash on the quality of the reference surface; furthermore, during the die-casting process, at the contact point between the protrusion structure 111 and the step 221, the direction of the liquid working fluid is lateral rather than along the axial direction of the insert pin 100 (see reference). Figure 2 (The arrow in the image indicates the direction of the arrow), thereby reducing the axial displacement of the insert 100 under pressure and helping to maintain the positional stability of the insert 100.

[0037] Furthermore, a rounded corner or chamfer is provided between the inner wall surface of the protruding structure 111 and the end face of the first end of the rod 110, so that the liquid working fluid can be guided to flow to the center of the rod 110 of the insert 100 through the rounded corner or chamfer, and the liquid working fluid is prevented from accumulating at the corner of the protruding structure 111 and the rod 110, which facilitates demolding.

[0038] Furthermore, the top of the protrusion 111 is provided with a rounded corner, and the step 221 of the mold core 200 has a contour that matches the top of the protrusion 111, so that the step 221 can fit better with the protrusion 111.

[0039] Furthermore, a positioning groove 230 is provided on the outer surface of the mold core 200. The positioning groove 230 communicates with the mounting hole 210, and the cup head 120 can be placed in the positioning groove 230. Thus, the position of the cup head 120 is restricted by the positioning groove 230 to prevent it from shifting randomly.

[0040] Furthermore, the side of the positioning groove 230 that connects with the mounting hole 210 is its bottom surface, and the side of the cup head 120 that connects with the rod 110 is its top surface. The bottom surface of the positioning groove 230 and the top surface of the cup head 120 abut against each other, thereby achieving the abutment and limiting of the cup head 120 and restricting the axial displacement of the insert pin 100.

[0041] Furthermore, it is easy to understand that the rod 110 and cup head 120 of the insert 100 can be configured as prism, cylinder or elliptical cylinder, etc. In this embodiment, the rod 110 and cup head 120 of the insert 100 are both cylindrical structures, and the central axis of the cup head 120 and the rod 110 are coaxially arranged.

[0042] Correspondingly, the protrusion structure 111 is annular and is disposed at the edge of the first end of the rod 110, and the central axis of the protrusion structure 111 is coaxial with the central axis of the rod 110.

[0043] Correspondingly, the mounting hole 210 of the mold core 200 is a round hole, which can match the cylindrical rod 110 of the insert pin 100. The inner wall of the mounting hole 210 is in contact with the side wall of the rod 110, thereby reducing the amplitude of lateral displacement of the insert pin 100 when subjected to external force, and avoiding a decrease in positioning accuracy due to lateral displacement of the insert pin 100.

[0044] Reference Figure 3 A die-casting mold according to a second aspect embodiment of this application includes the aforementioned high-precision and high-stability insert structure.

[0045] Furthermore, the die-casting mold also includes a mold blank 300, which is provided with a receiving groove for accommodating the mold core 200. After the mold core 200 is installed into the receiving groove, the inner wall of the mold blank 300 can abut against the cup head 120, so that the insert pin 100 cannot be axially pulled out from the mold core 200, thereby suppressing the axial displacement of the insert pin 100.

[0046] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A high-precision and high-stability pin insert structure, characterized in that, include: A pin includes a rod and a cup head. The rod extends from a first end to a second end along its length. The first end of the rod has an annular protrusion that surrounds a recessed structure. The cup head is located at the second end of the rod, and the outer diameter of the cup head is larger than the outer diameter of the rod. The mold core has a connected mounting hole and a forming cavity. The mounting hole allows the rod of the insert pin to be inserted. The cup head abuts against the opening of the mounting hole. A step is provided at the junction of the forming cavity and the mounting hole. The protruding structure of the rod abuts against the step. The inner wall surface of the mold core is in contact with the inner wall surface of the protruding structure.

2. The high-precision and high-stability pin structure according to claim 1, characterized in that: The inner wall surface of the protruding structure and the end face of the first end of the rod are provided with a rounded corner or chamfer.

3. The high-precision and high-stability pin structure according to claim 1, characterized in that: The top of the protruding structure is provided with a rounded corner, and the step of the mold core has a contour that matches the top of the protruding structure.

4. The high-precision and high-stability pin structure according to claim 1, characterized in that: The outer surface of the mold core is provided with a positioning groove, which communicates with the mounting hole, and the cup head can be placed in the positioning groove.

5. The high-precision and high-stability insert structure according to claim 4, characterized in that: The side of the positioning groove that connects with the mounting hole is its bottom surface, and the side of the cup head that connects with the rod is its top surface. The bottom surface of the positioning groove and the top surface of the cup head abut against each other.

6. The high-precision and high-stability pin structure according to claim 1, characterized in that: Both the rod and the cup head of the inlay are cylindrical structures, and the cup head is coaxial with the central axis of the rod.

7. The high-precision and high-stability pin structure according to claim 6, characterized in that: The protruding structure is annular and is located at the edge of the first end of the rod. The central axis of the protruding structure is coaxial with the central axis of the rod.

8. The high-precision and high-stability pin structure according to claim 6, characterized in that: The mounting hole of the mold core is a round hole, and the inner wall of the mounting hole is in contact with the side wall of the rod.

9. A die-casting mold, characterized in that, The pin-mount structure includes the high-precision and high-stability pin structure described in any one of claims 1 to 8.

10. The die-casting mold according to claim 9, characterized in that: The die-casting mold also includes a mold blank, which is provided with a receiving groove for accommodating the mold core, and the inner wall of the mold blank can abut against the cup head to suppress the axial displacement of the insert.

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