Core structure of die-casting die for large thin-walled workpiece

Abstract

The utility model relates to a large thin-wall part die-casting die core structure which comprises a die frame of a die-casting die, a die core is fixedly connected to the die frame, an insertion hole is formed in the die frame, a supporting shaft is inserted into the insertion hole, one end of the supporting shaft abuts against a bottom sealing block, and the bottom sealing block is inserted into the die frame and fixedly connected to the die frame through a plurality of screws. A step-shaped guide hole is formed in the mold core, an insert bush is inserted in the guide hole, a mandrel is embedded in the insert bush, one end of the mandrel extends out of the insert bush and the mold core to form a conical mold core, and a cylindrical internal thread connecting sleeve is formed at the other end of the mandrel; the end, away from the bottom sealing block, of the supporting shaft is inserted into the guide hole of the mold core and is in threaded connection with a threaded connection column, a stud is formed on the threaded connection column and is in threaded connection with the interior of an inner threaded connection sleeve of the mandrel, and the inner threaded connection sleeve abuts against the supporting shaft. The structure of the mold core is rectified, the mold core is designed to be of a split structure, setting of a step fillet is omitted, stress concentration is eliminated, and the occurrence of mold core breakage can be effectively reduced.

Description

Technical field:

[0001] The utility model relates to the technical field of die-casting molds, and more specifically to a core structure of a die-casting mold for large-scale thin-walled parts. Background technology:

[0002] A die-casting mold is a tool for casting metal parts. Existing die-casting molds generally include a mold frame and a mold core (also called a mold core). An integrated mandrel is arranged in the mold frame and the mold core, and a tapered core is arranged in the middle of the end face of the mandrel. The core extends out of the mold core and is used to make a cavity in a die-casting. The existing integrated core structure is frequently subjected to the impact of molten aluminum, and is affected by high temperature, high pressure, thermal expansion and contraction during the production process, which will generate stress. The diameter of the existing core is smaller than the diameter of the mandrel, and the transition part between the core and the mandrel is generally processed with an arc-shaped fillet. The stress is concentrated in the fillet, which makes the core easy to break at the fillet. Therefore, it is necessary to rectify the core structure to reduce the occurrence of core breakage. Utility model content:

[0003] The purpose of the utility model is to address the deficiencies of the prior art and to provide a core structure for a die-casting mold for large thin-walled parts. The structure of the core is improved, the core is designed to be a split structure, the setting of the step radius is cancelled, the stress concentration is cancelled, and the occurrence of core breakage can be effectively reduced.

[0004] A core structure of a die-casting mold for large thin-walled parts comprises a mold frame of the die-casting mold, a mold core is fixedly connected to the mold frame, a socket is formed in the mold frame, a support shaft is inserted in the socket, one end of the support shaft abuts against a bottom block, the bottom block is inserted in the mold frame and fixedly connected to the mold frame by a plurality of screws; a step-type guide hole is formed on the mold core, a sleeve is inserted in the guide hole, a core shaft is embedded in the sleeve, one end of the core shaft extends out of the sleeve and forms a conical core with the mold core, and the other end forms a cylindrical internal threaded sleeve; one end of the support shaft away from the bottom block is inserted in the guide hole of the mold core and is screwed with a threaded connecting column, a stud is formed on the threaded connecting column, the stud is screwed in the internal threaded sleeve of the core shaft, and the internal threaded sleeve abuts against the support shaft.

[0005] Preferably, a cylindrical annular limiting sleeve is formed at one end of the insert sleeve away from the core, and the limiting sleeve is inserted into the internal threaded sleeve and abuts against the end surface of the support shaft;

[0006] The guide hole on the mold core consists of a large axial hole close to the mold frame side and a small axial hole close to the core side. The length of the small axial hole is greater than the length of the large axial hole. The aperture of the large axial hole is equal to the diameter of the outer wall of the limiting sleeve. The diameter of the outer wall of the limiting sleeve is greater than the aperture of the jack. The diameter of the outer wall of the internal threaded sleeve is smaller than the diameter of the outer wall of the support shaft.

[0007] Preferably, an annular groove is formed on the inner wall of the insert sleeve near the internal threaded sleeve, and the length of the annular groove is greater than half the length of the insert sleeve; the end face of the insert sleeve near the core is flush with the end face of the mold core;

[0008] The central axis of the core, the central axis of the internal threaded socket and the central axis of the core shaft coincide with each other.

[0009] Preferably, the diameter of the threaded connection column is larger than the diameter of the stud, and the thread rotation direction of the threaded connection column is opposite to that of the stud.

[0010] Preferably, a threaded bottom hole opposite to the threaded connection column is formed on the support shaft, and the length of the threaded bottom hole is not less than the length of the threaded connection column and not greater than the sum of the lengths of the threaded connection column and the stud.

[0011] Preferably, the diameter of the outer wall of the core on the mandrel close to one end of the mandrel is equal to the diameter of the mandrel.

[0012] The beneficial effects of the utility model are:

[0013] 1. The core structure has been rectified, and the core is designed to be a split structure, the step fillet setting is cancelled, and the stress concentration is cancelled, which can effectively reduce the occurrence of core breakage and reduce production costs.

[0014] 2. The core structure design is a split structure. Compared with the original integrated structure, it can be quickly disassembled and replaced, which can reduce the labor intensity of employees' replacement. Description of the drawings:

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a three-dimensional structural schematic diagram of the inner core shaft part of the utility model;

[0017] Figure 3 It is a schematic diagram of the structure of the utility model with a die casting;

[0018] Figure 4 The utility model is provided with a cross-sectional schematic diagram of a die casting;

[0019] Figure 5 for Figure 4 A local enlarged schematic diagram of point A in the middle.

[0020] In the figure: 1. mold frame; 11. socket; 12. recess; 2. mold core; 21. guide hole; 3. support shaft; 4. threaded connection column; 41. stud; 5. core shaft; 51. internal threaded socket; 6. insert sleeve; 61. limit sleeve; 62. annular groove; 7. bottom block; 8. screw; 9. die casting. Specific implementation method:

[0021] Example: See Figures 1 to 5 As shown, a core structure of a die-casting mold for large thin-walled parts includes a die frame 1 of a die-casting mold, a mold core 2 is fixedly connected to the mold frame 1, a plug hole 11 is formed in the mold frame 1, a support shaft 3 is inserted in the plug hole 11, one end of the support shaft 3 abuts against a bottom cover block 7, the bottom cover block 7 is inserted in the mold frame 1 and fixedly connected to the mold frame 1 by a plurality of screws 8, the mold frame 1 is provided with a concave platform 12 opposite to the bottom cover block 7, and the bottom cover block 7 is located in the concave platform 12; a step-shaped guide hole 21 is formed on the mold core 2, and the guide hole 21 is formed on the mold core 2. An insert sleeve 6 is inserted into the hole 21, and a core shaft 5 is embedded in the insert sleeve 6. One end of the core shaft 5 extends out of the insert sleeve 6 and the mold core 2 to form a conical core, and the other end is formed with a cylindrical internal threaded sleeve 51, and the core is inserted in the die-casting 9; the end of the support shaft 3 away from the bottom block 7 is inserted in the guide hole 21 of the mold core 2 and is screwed with a threaded connecting column 4, and a stud 41 is formed on the threaded connecting column 4, and the stud 41 is screwed into the internal threaded sleeve 51 of the core shaft 5, and the internal threaded sleeve 51 rests on the support shaft 3.

[0022] The end of the insert sleeve 6 away from the core is formed with a cylindrical ring-shaped limiting sleeve 61, which is inserted into the internal threaded sleeve 51 and abuts against the end surface of the support shaft 3; the length of the support shaft 3 extending out of the mold frame 1 is greater than the length of the core.

[0023] The guide hole 21 on the mold core 2 is composed of a large axial hole on the side close to the mold frame 1 and a small axial hole on the side close to the core. The length of the small axial hole is greater than the length of the large axial hole. The aperture of the large axial hole is equal to the diameter of the outer wall of the limiting sleeve 61. The diameter of the outer wall of the limiting sleeve 61 is greater than the aperture of the jack 11. The diameter of the outer wall of the internal threaded sleeve 51 is smaller than the diameter of the outer wall of the support shaft 3.

[0024] An annular groove 62 is formed on the inner wall of the insert sleeve 6 near the internal threaded sleeve 51. The length of the annular groove 62 is greater than half the length of the insert sleeve 6. The setting of the annular groove 62 facilitates the insert sleeve 6 to be nested on the core shaft 5. The end face of the insert sleeve 6 near the core is flush with the end face of the mold core 2.

[0025] The central axis of the core, the central axis of the internal threaded socket 51 and the central axis of the core shaft 5 coincide with each other.

[0026] The diameter of the threaded connection column 4 is greater than the diameter of the stud 41 , and the thread rotation direction of the threaded connection column 4 is opposite to that of the stud 41 . The threads of the two are opposite, which facilitates the connection between the core shaft 5 and the support shaft 3 .

[0027] The support shaft 3 is formed with a threaded bottom hole opposite to the threaded connecting column 4. The length of the threaded bottom hole is not less than the length of the threaded connecting column 4 and not greater than the sum of the lengths of the threaded connecting column 4 and the stud 41. The stud 41 can enter the support shaft 3, but the threaded connecting column 4 cannot extend out of the support shaft 3, otherwise the support shaft 3 and the core shaft 5 cannot be put together, which is prone to loosening and causing the position of the core to change.

[0028] The outer wall diameter of the core on the mandrel 5 close to one end of the mandrel 5 is equal to the diameter of the mandrel 5. The mandrel 5 and the core are integrated, and there is no step surface between the two, otherwise stress concentration problems will occur.

[0029] Working principle: The utility model is a die-casting mold core structure for thin-walled parts. The die-casting mold core structure divides the original integrated core into a split structure consisting of a support shaft 3, a sleeve 6, a core shaft 5 and a threaded connection column 4. The core is provided on the core shaft 5. At the same time, the sleeve 6 can enhance the strength of the core shaft 5, but at the same time, the original structure that the two are integrated and need to be rounded is cancelled. Since there is no rounded part, stress concentration is eliminated, and the fracture of the core at the end of the core shaft 5 can be reduced;

[0030] At the same time, the split structure is convenient for assembly and connection, and is also convenient for disassembly. Compared with the original integral structure, replacement is more convenient. Moreover, when the core has problems such as deformation, it is mainly necessary to replace the insert sleeve 6 and the core shaft 5, which can save resources and reduce production costs.

[0031] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A core structure of a die-casting mold for a large thin-walled part, comprising a die frame (1) of a die-casting mold, a mold core (2) fixedly connected to the die frame (1), an insertion hole (11) formed in the die frame (1), a support shaft (3) inserted in the insertion hole (11), one end of the support shaft (3) abutting against a bottom cover block (7), the bottom cover block (7) inserted in the die frame (1) and fixedly connected to the die frame (1) by a plurality of screws (8); characterized in that: The mold core (2) is formed with a stepped guide hole (21), a sleeve (6) is inserted into the guide hole (21), a core shaft (5) is embedded in the sleeve (6), one end of the core shaft (5) extends out of the sleeve (6) and the mold core (2) to form a conical core, and the other end is formed with a cylindrical internal threaded sleeve (51); the end of the support shaft (3) away from the bottom sealing block (7) is inserted into the guide hole (21) of the mold core (2) and is screwed with a threaded connection column (4), a stud (41) is formed on the threaded connection column (4), the stud (41) is screwed into the internal threaded sleeve (51) of the core shaft (5), and the internal threaded sleeve (51) abuts against the support shaft (3).

2. A large thin-walled die casting mold core structure according to claim 1, characterized in that: A cylindrical ring-shaped limiting sleeve (61) is formed on one end of the insert sleeve (6) away from the core, and the limiting sleeve (61) is inserted into the internal threaded sleeve (51) and abuts against the end surface of the support shaft (3); The guide hole (21) on the mold core (2) is composed of a large axial hole on the side close to the mold frame (1) and a small axial hole on the side close to the core, the length of the small axial hole is greater than the length of the large axial hole, the diameter of the large axial hole is equal to the diameter of the outer wall of the limiting sleeve (61), and the diameter of the outer wall of the limiting sleeve (61) is greater than the diameter of the insertion hole (11); the diameter of the outer wall of the internal threaded sleeve (51) is smaller than the diameter of the outer wall of the support shaft (3).

3. A large thin-walled die casting mold core structure according to claim 2, characterized in that: An annular groove (62) is formed on the inner wall of the insert sleeve (6) on the side close to the internal threaded sleeve (51), and the length of the annular groove (62) is greater than half the length of the insert sleeve (6); the end surface of the insert sleeve (6) on the side close to the core is flush with the end surface of the mold core (2); The central axis of the core, the central axis of the internal threaded socket (51) and the central axis of the core shaft (5) coincide with each other.

4. A large thin-walled die casting mold core structure according to claim 2, characterized in that: The diameter of the threaded connection column (4) is greater than the diameter of the stud (41), and the thread rotation direction of the threaded connection column (4) is opposite to that of the stud (41).

5. A large thin-walled die casting mold core structure according to claim 4, characterized in that: The support shaft (3) is formed with a threaded bottom hole opposite to the threaded connection column (4), and the length of the threaded bottom hole is not less than the length of the threaded connection column (4) and not greater than the sum of the lengths of the threaded connection column (4) and the stud (41).

6. A large thin-walled die casting mold core structure according to claim 3, characterized in that: The diameter of the outer wall of the core on the mandrel (5) close to one end of the mandrel (5) is equal to the diameter of the mandrel (5).

Images