Injection mechanism for die casting mold

Abstract

The present invention discloses an injection mechanism for a die-casting mold, comprising a barrel, a punch and an insert. The barrel is provided with an axially arranged material cavity, the front end is connected to the die-casting mold, and the rear end is axially recessed with an installation area for installing the insert. An injection port and an oil injection hole are provided on the side wall of the barrel. The insert is a tubular structure, and its inner diameter is the same as that of the barrel. An oil guide groove is provided around the outer wall of the insert, and an oil through hole is provided around the bottom of the oil guide groove. The insert is provided in the installation area, and the oil through hole corresponds to the oil guide groove. The punch is slidably provided in the material cavity and is connected to a drive rod, and the drive rod is used to push the punch to move axially in the material cavity. The present invention achieves all-round coating of lubricating oil on the punch by cooperating with the oil guide groove and the oil through hole, while reducing the waste of lubricating oil. An additional oil closing pipe is provided to realize the opening and closing of the oil through hole without gap. The punch and the drive rod are floatingly connected by a connector, which achieves adaptive adjustment of the punch.

Description

Technical Field

[0001] The invention relates to the field of die casting, and in particular to an injection mechanism for a die casting mold. Background Art

[0002] The injection mechanism is a device used to inject molten aluminum into the die-casting mold. The punch moves back and forth in the barrel to inject the molten aluminum in the barrel into the mold. Lubricating oil needs to be injected every time the punch moves back and forth. The existing mechanism manually sprays lubricating oil directly on the inner wall of the barrel, which will cause waste of lubricating oil and cannot be evenly applied. Summary of the Invention

[0003] In view of the defects of the above-mentioned prior art, the main purpose of the present invention is to overcome the shortcomings of the prior art and discloses a material injection mechanism for a die-casting mold, including a barrel, a punch and an insert. The barrel is axially provided with a material cavity, the front end is connected to the die-casting mold, and the rear end is axially recessed with an installation area for installing the insert. A material injection port and an oil injection hole are provided on the side wall of the barrel. The insert is a tubular structure, and the inner diameter is the same as the inner diameter of the barrel. An oil guide groove is provided on the outer wall of the insert, and an oil through hole is provided on the bottom of the oil guide groove. The insert is provided in the installation area, and the oil through hole corresponds to the oil guide groove. The punch is slidably provided in the material cavity and is connected to the drive rod, and the drive rod is used to push the punch to move axially in the material cavity.

[0004] In one embodiment, the insert is tightly fitted into the mounting area.

[0005] In one embodiment, the oil through holes are provided at least twice, and one oil through hole in one circumference partially overlaps with another oil through hole in another circumference.

[0006] In one embodiment, it also includes an oil-closing tube, a spring and a rear cover plate. The outer diameter of the oil-closing tube matches the inner diameter of the insert. One end of the oil-closing tube is provided with a guide portion protruding outward, and the inner wall of the insert is provided with a guide cavity that matches the guide portion. The oil-closing tube is arranged in the insert, and the rear cover plate is fixedly arranged at the rear end of the barrel. The spring is arranged in the guide cavity, and its two ends act on the oil-closing tube and the rear cover plate; when the punch injects material into the mold, the oil-closing tube moves axially to close the oil hole.

[0007] In one embodiment, a buffer pad is provided on the end surface of the oil closing tube that contacts the punch.

[0008] In one embodiment, two sealing rings are spaced apart on the outer wall of the oil-blocking tube. When the oil through hole is closed, the sealing rings are located on both sides of the oil through hole.

[0009] In one embodiment, the punch is connected to the drive rod through a connecting mechanism, and the connecting mechanism includes a connecting piece and a fixing sleeve. Two connecting pieces are provided and spliced into an annular structure. The upper and lower ends of the connecting piece are axially extended inward to provide a limiting portion. One end of the punch is axially provided with a first card edge, and one end of the drive rod is axially provided with a second card edge. The second card edge is stacked on the first card edge and fixed by the connecting piece. The fixing sleeve is provided on the outside of the connecting piece to fix the connecting piece.

[0010] In one embodiment, a diameter of the first card edge is different from a diameter of the second card edge.

[0011] In one embodiment, a diameter of the second card edge is smaller than a diameter of the first card edge.

[0012] In one embodiment, a magnet is provided at the end of the fixing sleeve to be adsorbed and fixed on the punch.

[0013] The beneficial effects achieved by the present invention are:

[0014] The invention utilizes an oil guide groove and oil hole to ensure lubricating oil is fully coated on the punch, reducing lubricating oil waste. The addition of an oil closing pipe allows for seamless opening and closing of the oil hole. The punch and drive rod are connected in a floating manner via a connector, enabling adaptive adjustment of the punch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the three-dimensional structure of an injection mechanism for a die-casting mold of the present invention;

[0016] Figure 2 for Figure 1 A top view of

[0017] Figure 3 for Figure 2 AA cross-sectional view;

[0018] Figure 4 Schematic diagram of the three-dimensional structure of the insert;

[0019] Figure 5 for Figure 4 A structural diagram from another perspective;

[0020] Figure 6 A schematic diagram of a three-dimensional structure in which a punch and a driving rod are connected via a connecting mechanism;

[0021] Figure 7 This is an exploded diagram showing the connection between the punch and the driving rod through a connecting mechanism;

[0022] The reference numerals are as follows:

[0023] 1. Barrel, 2. Punch, 3. Insert, 4. Oil closing pipe, 5. Spring, 6. Rear cover, 7. Drive rod, 8. Connector, 9. Fixed sleeve, 11. Material cavity, 12. Filling port, 13. Oil filling hole, 21. First clamping edge, 31. Oil guide groove, 32. Oil through hole, 33. Guide cavity, 41. Guide part, 71. Second clamping edge, 81. Limiting part. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] An injection mechanism for a die casting mold, such as Figure 1-5 As shown, it includes a barrel 1, a punch 2, and an insert 3. The barrel 1 is axially provided with a cavity 11, the front end is connected to the die-casting mold, and the rear end is axially recessed with an installation area for installing the insert. The side wall of the barrel 1 is provided with a material injection port 12 and an oil injection hole 13. The insert 3 is a tubular structure with an inner diameter identical to that of the barrel 1. An oil guide groove 31 is provided around the outer wall of the insert 3, and an oil hole 32 is provided around the bottom of the oil guide groove 31. The insert 3 is provided in the installation area, and the oil hole 32 corresponds to the oil guide groove 31, forming an oil guide ring between the oil guide groove 31 and the barrel 1. The punch 2 is slidably provided in the cavity 11 and is connected to the drive rod 4. The drive rod 7 is used to push the punch 2 to move axially in the cavity 11.

[0026] In one embodiment, if Figure 1-5 As shown, the insert 3 is tightly fitted with the mounting area.

[0027] In one embodiment, if Figure 1-5 As shown, the oil holes 32 are arranged at least two times, and one oil hole 32 in one direction partially overlaps with another oil hole 32 in another direction. There is a gap between adjacent oil holes in one direction, and this gap prevents the lubricating oil from being quickly applied to the punch 2. However, by having two oil holes 32 and overlapping portions, the entire circumference of the punch 2 can be coated with lubricating oil, greatly reducing the amount of lubricating oil used.

[0028] In one embodiment, if Figure 1-5As shown, the barrel 1 further includes an oil-blocking tube 4, a spring 5, and a rear cover plate 6. The outer diameter of the oil-blocking tube 4 matches the inner diameter of the insert 3. One end of the oil-blocking tube 4 protrudes outward to form a guide portion 41. The inner wall of the insert 3 is provided with a guide cavity 33 that mates with the guide portion 41. The oil-blocking tube is disposed within the insert 3, and the rear cover plate 6 is fixedly mounted at the rear end of the barrel 1. The spring 5 is disposed within the guide cavity 41, with both ends acting on the oil-blocking tube 4 and the rear cover plate 6. When the punch 2 injects material into the mold, the oil-blocking tube 4 moves axially to close the oil hole 32. When the drive rod 7 drives the punch 2 to inject material into the mold, the oil-blocking tube 4 is initially pressed against the punch 2 by the elastic force of the spring 5. The punch 2 continues to move axially until the guide portion 41 is restricted by the insert 3 and cannot move further. The punch 2 separates from the oil-blocking tube 4. At this point, the outer wall of the oil-blocking tube 4 closes the oil hole 32, preventing the continuous outflow of lubricating oil and causing unnecessary waste.

[0029] In the above embodiment, if Figure 1-5 As shown, a buffer pad is provided on the end surface of the oil closing tube 4 that contacts the punch 2 to seal the oil closing tube 4 and the punch 2, while preventing a hard collision between the punch 2 and the oil closing tube 4 at the moment of contact.

[0030] In the above embodiment, if Figure 1-5 As shown, two sealing rings are spaced apart on the outer wall of the oil closing pipe 4 . When the oil through hole 32 is closed, the sealing rings are located on both sides of the oil through hole 32 to further seal the oil through hole 32 .

[0031] In one embodiment, if Figure 1-7 As shown, the punch 2 is connected to the drive rod 7 through a connecting mechanism, which includes a connecting piece 8 and a fixing sleeve 9. Two connecting pieces 8 are provided and spliced into a ring structure. The upper and lower ends of the connecting piece 8 are axially extended inward to provide a limiting portion 81. One end of the punch 2 is axially provided with a first card edge 21, and one end of the drive rod 7 is axially provided with a second card edge 71. The second card edge 71 is stacked on the first card edge 21. The connecting piece 8 is installed on the first card edge 21 and the second card edge 71, and the limiting portion 81 is used to limit the relative axial movement of the first card edge 21 and the second card edge 71. After the installation is completed, the fixing sleeve 9 is sleeved on the outside of the connecting piece 8 to quickly fix the two connecting pieces 8 together.

[0032] In one embodiment, if Figure 1-7 As shown, the diameter of the first card edge 21 differs from the diameter of the second card edge 71. That is, there is a gap between the first card edge 21 or the second card edge 71 and the inner wall of the connecting member 8. This structure allows adaptive adjustment even when the drive rod 7 and the punch 2 are not coaxial. Preferably, the diameter of the second card edge 71 is smaller than that of the first card edge 21.

[0033] In the above embodiment, if Figure 1-7As shown, a magnet is provided at the end of the fixing sleeve 9 to secure it to the punch 2. The magnet's inherent adsorption allows for quick installation and removal of the fixing sleeve 9. Of course, other connection methods are also possible. For example, continuous threads can be provided on the outer walls of the two connecting members 8, and matching threads can be provided on the inner wall of the fixing sleeve 9. After the two connecting members 8 are spliced together, the fixing sleeve 9 can be rotated to engage with the threads of the connecting members 8, thus achieving a quick connection.

[0034] During use, the present invention injects molten aluminum into the material pipe 1 through the injection hole 12. Lubricating oil is injected into the oil guide groove 31 through the oil injection hole 13 with a certain oil pressure, so that the lubricating oil is applied to the punch 2 through the oil hole 32. The driving rod 7 is then pushed to drive the punch 2 to move axially. During this movement, the punch is continuously coated with lubricating oil. At the same time, the oil closing tube 4 moves synchronously with the punch 2 until the guide portion 41 closes the oil hole 32. The punch 2 then continues to move forward and hydraulically injects the aluminum into the die-casting mold. Once completed, the driving rod 7 drives the punch 2 to move in the opposite direction, and after contacting the oil closing tube 4, it drives it to move synchronously until it returns to its initial position.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced with equivalents without departing from the spirit and scope of the present invention, they should be included in the scope of protection of the claims of the present invention.

Claims

1. A material injection mechanism for a die-casting mold, characterized in that: The present invention comprises a barrel, a punch and an insert, wherein the barrel is axially provided with a material cavity, the front end is connected to the die-casting mold, and the rear end is axially concavely provided with an installation area for installing the insert, a material injection port and an oil injection hole are provided on the side wall of the barrel, the insert is a tubular structure, and the inner diameter is the same as the inner diameter of the barrel, an oil guide groove is provided on the outer wall of the insert, an oil through hole is provided on the bottom of the oil guide groove, the insert is provided in the installation area, and the oil through hole corresponds to the oil guide groove, the punch is slidably provided in the material cavity and is connected to a drive rod, and the drive rod is used to push the punch to move axially in the material cavity; The barrel further includes an oil-blocking tube, a spring, and a rear cover plate. The outer diameter of the oil-blocking tube matches the inner diameter of the insert. One end of the oil-blocking tube protrudes outward to provide a guide portion. The inner wall of the insert is provided with a guide cavity that matches the guide portion. The oil-blocking tube is disposed in the insert. The rear cover plate is fixedly disposed at the rear end of the barrel. The spring is disposed in the guide cavity, with both ends acting on the oil-blocking tube and the rear cover plate. When the punch injects material into the mold, the oil-blocking tube moves axially to close the oil hole. The insert is tightly fitted with the mounting area; The oil through holes are provided at least twice, and one oil through hole in one circumferential direction partially overlaps with the oil through hole in another circumferential direction.

2. The injection mechanism for a die-casting mold according to claim 1, characterized in that: A buffer pad is provided on the end surface of one end of the oil closing pipe in contact with the punch.

3. The injection mechanism for a die-casting mold according to claim 1, characterized in that: Two sealing rings are arranged at intervals on the outer wall of the oil-closing pipe. When the oil through hole is closed, the sealing rings are located on both sides of the oil through hole.

4. The injection mechanism for a die-casting mold according to claim 1, characterized in that: The punch is connected to the drive rod through a connecting mechanism, and the connecting mechanism includes a connecting piece and a fixing sleeve. Two connecting pieces are provided and spliced into an annular structure. The upper and lower ends of the connecting piece are axially extended inward to provide a limiting portion. One end of the punch is axially provided with a first card edge outward, and one end of the drive rod is axially provided with a second card edge outward. The second card edge is superimposed on the first card edge and fixed by the connecting piece. The fixing sleeve is sleeved on the outside of the connecting piece to fix the connecting piece.

5. The injection mechanism for a die-casting mold according to claim 4, characterized in that: The diameter of the first card edge is different from the diameter of the second card edge.

6. The injection mechanism for a die-casting mold according to claim 5, characterized in that: A diameter of the second card edge is smaller than a diameter of the first card edge.

7. The injection mechanism for a die-casting mold according to claim 4, characterized in that: A magnet is provided at the end of the fixing sleeve so as to be adsorbed and fixed on the punch.

Images