Injection mold with oil groove ejection function

Abstract

The utility model relates to the field of injection molds, and discloses an injection mold with an oil groove ejection function, which comprises a rack, a mold core is fixedly arranged on the rack, the mold core is used for molding an injection product, an ejector pin is slidably arranged between the rack and the mold core, the ejector pin penetrates through the mold core, the ejector pin is used for ejecting the product out of the mold core, and the ejector pin is provided with an oil groove for lubricating the mold core. The oil groove is used for storing lubricating liquid. The ejector pin comprises a base fixedly connected with the ejector plate and an ejector rod connected to the base, the end, away from the base, of the ejector rod is slidably connected to the mold core, the ejector rod is a columnar rod, and the oil groove is formed in the outer ring of the ejector rod. The ejector pin rubs with the mold core in the sliding process, the lubricating liquid is brought between the friction surfaces of the ejector pin and the mold core through the oil groove so as to achieve the lubricating effect, and the phenomena that the ejector pin slides unsmoothly and is stuck can be effectively reduced. A small part of lubricating oil in the oil groove is reserved in the inner cavity of the connecting hole, an oil film is formed between the inner wall of the connecting hole and the ejector rod due to long-term sliding, and the lubricating effect can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, specifically to an injection mold with an oil groove ejector. Background Technology

[0002] In the injection mold production process, ejector pins are key demolding components, and their performance directly affects the molding quality and production efficiency of the product. They eject the plastic part from the mold through the ejector plate to achieve the demolding function. However, due to insufficient lubrication of the ejector pins, problems such as uneven ejection and jamming can easily occur, leading to production interruption, or even damage to the mold or a decline in the quality of the plastic part. For example, if the ejector pin surface lacks lubrication protection, it is easy to wear or break due to excessive friction, thereby affecting its service life and demolding efficiency. Based on the above technical problems, the following improvements are proposed. Utility Model Content

[0003] The present invention aims to provide an injection mold with an oil groove for ejection, so as to solve the problem of insufficient lubrication of the ejector pin.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an injection mold with an oil groove ejector, comprising a frame, a mold core fixedly mounted on the frame, the mold core being used for injection molding of products, an ejector pin slidably mounted between the frame and the mold core, the ejector pin passing through the mold core, the ejector pin being used to eject the product from the mold core, and the ejector pin having an oil groove for lubricating the mold core, the oil groove being used to store lubricating fluid.

[0005] The beneficial effects of this solution are as follows: by setting up an oil groove, the lubricant is stored in the oil groove. During the sliding process, the ejector pin rubs against the mold core, and the oil groove carries the lubricant between the two friction surfaces to achieve a lubrication effect. This can effectively reduce the occurrence of phenomena such as uneven ejector pin sliding and jamming.

[0006] Furthermore, fixed frames are symmetrically arranged on both sides of the frame, and the mold core is fixedly connected to the end of the fixed frame away from the frame. A sliding cavity for the ejector pin to slide is formed between the frame, the fixed frame and the mold core.

[0007] Furthermore, a top plate is slidably connected inside the sliding cavity, and an ejector pin is fixed to the top plate. The top plate is used to drive the ejector pin to slide inside the mold core.

[0008] The beneficial effects of this solution are as follows: the external ejector device passes through the frame and enters the sliding cavity. The external device inside the sliding cavity is connected to the top plate, and under the action of the external device, the top plate slides away from the frame. The top plate drives the ejector pin to move in the sliding cavity, and the ejector pin is slidably connected to the mold core. Therefore, the purpose of the top plate driving the ejector pin to slide in the sliding cavity can be achieved.

[0009] Furthermore, the ejector pin includes a base fixedly connected to the top plate and an ejector rod connected to the base. The end of the ejector rod away from the base is slidably connected to the mold core. The ejector rod is configured as a columnar rod, and an oil groove is opened on the outer ring of the ejector rod.

[0010] Furthermore, the mold core has a connecting hole for the ejector rod to slide, and the diameter of the connecting hole is equal to the diameter of the outer ring of the ejector rod.

[0011] The beneficial effects of this solution are as follows: during the sliding process of the push rod, a sealed lubrication chamber is formed between the oil groove and the inner wall of the connecting hole. During the sliding process of the push rod, a small portion of the lubricating oil in the oil groove will remain on the inner wall of the connecting hole. Over a long period of sliding, an oil film is formed between the inner wall of the connecting hole and the push rod, which can play a lubricating role.

[0012] Furthermore, the push rod is slidably connected to the base, and an elastic element connects the push rod and the base. The base has an oil cavity for storing lubricating fluid, and the push rod has an oil passage with its two ends connected to the oil cavity and the oil groove, respectively.

[0013] Furthermore, a guide cylinder is provided at the top of the base for the sliding of the push rod. The inner diameter of the guide cylinder is equal to the diameter of the push rod. A baffle is provided at the bottom of the push rod. The inner diameter of the oil chamber is larger than the inner diameter of the guide cylinder. The diameter of the baffle is larger than the diameter of the push rod but smaller than the inner diameter of the oil chamber. A piston is provided between the outer ring of the baffle and the inner ring of the oil chamber.

[0014] Furthermore, the elastic element is set as a spring and connected between the bottom of the oil chamber and the baffle.

[0015] The beneficial effects of this solution are as follows: when the push rod is not lifted, the spring naturally extends and pushes the push rod out of the oil chamber of the base. At this time, the pressure in the oil chamber decreases, and the pressure in the oil passage and oil groove squeezes the lubricant into the oil chamber. When the push rod is lifted and comes into contact with the product, the spring is compressed, and the bottom end of the push rod is embedded in the oil chamber, which increases the pressure in the oil chamber. The pressure in the oil chamber forces the lubricant into the oil groove through the oil passage, thus lubricating during the sliding process.

[0016] Compared with existing technologies, the temperature of the injection mold core is relatively high. Long-term injection molding leads to an increase in the temperature of the lubricating oil. After heating, the lubricating oil undergoes a series of changes, such as viscosity reduction, oxidation and deterioration, additive decomposition, thermal decomposition and carbonization. These changes significantly reduce its lubrication performance. Therefore, in this solution, the lubricating oil is injected into the oil groove for lubrication only when the product is ejected. After ejection, the lubricating oil returns to the oil cavity. This avoids the phenomenon of lubricating oil being stored in the mold core for a long time and heating it up, thus achieving the effect of not needing to change the lubricating oil for a long time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the overall structure of Embodiment 1 of this utility model;

[0019] Figure 3 for Figure 2 A partial view of the fit between the push rod oil groove and the connecting hole at point A;

[0020] Figure 4 This is a cross-sectional structural diagram of the base according to an embodiment of the present utility model;

[0021] Figure 5 This is a partial cross-sectional structural diagram of the top rod located at the oil groove in an embodiment of the present invention. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The reference numerals in the accompanying drawings include: frame 1, fixed frame 11, sliding cavity 12, top plate 121, mold core 2, product 21, connecting hole 22, ejector pin 3, base 31, oil cavity 311, guide cylinder 312, ejector rod 32, oil groove 321, oil passage 322, baffle 323, piston 3231, and spring 33.

[0024] Example

[0025] like Figures 1-5 The injection mold shown includes a frame 1 at the bottom, and fixed brackets 11 are symmetrically fixed on both sides of the top of the frame 1. The fixed brackets 11 are fixedly connected to the frame 1 by bolts. The top of the fixed brackets 11 is fixedly connected to the mold core 2 for molding the injection product 21 by bolts. The mold core 2 includes an upper mold core 2 and a lower mold core 2. When the product 21 is injected, the frame 1 is connected to several injection pipes through external equipment. The injection pipes are connected to the molding cavities of the upper and lower mold cores 2, and the injection liquid is injected into the molding cavities through the injection pipes to form the shape of the product 21. A sliding cavity 12 is formed between the bottom of the lower mold core 2, the two fixed brackets 11 on both sides, and the frame 1. A top plate 121 is vertically slidably connected to the bottom of the sliding cavity 12. Several guide rods are provided in the sliding cavity 12 between the frame 1 and the mold core 2. Several guide holes are opened on the top plate 12 for the guide rods to pass through.

[0026] An external device passes through the frame 1 into the sliding cavity 12 and abuts against the bottom end of the top plate 121, thereby driving the top plate 121 to slide within the sliding cavity 12. An ejector pin 3 is connected between the top plate 121 and the mold core 2 to eject the product 21 from the mold core 2. The ejector pin 3 includes a base 31 fixedly mounted on the top plate 121 and an ejector rod 32 slidably connected to the base 31. The base 31 is cylindrical and has a cylindrical oil cavity 311 inside. The top end of the base 31 is open and a guide cylinder 312 is integrally formed at the top end of the base 31. The lower end opening of the guide cylinder 312 is connected to the top end opening of the base 31. The inner diameter of the oil cavity 311 is larger than the inner diameter of the guide cylinder 312. A step is formed between the oil cavity 311 and the guide cylinder 312.

[0027] like Figure 4 As shown, the base 31 is slidably connected to a push rod 32 via a guide cylinder 312 at the top. The push rod 32 is also cylindrical, and its diameter is equal to the inner diameter of the guide cylinder 312. A sliding block structure with a groove is provided between the inner circle of the guide cylinder 312 and the push rod 32 to ensure that the push rod 32 does not rotate during the guiding process. A baffle 323 is integrally formed at the bottom end of the push rod 32 near the oil cavity 311. The baffle 323 is coaxially arranged with the push rod 32, and the diameter of the baffle 323 is larger than that of the oil cavity 311. The diameter of the push rod 32 is smaller than that of the oil cavity 311. A step is also formed between the top of the baffle 323 and the push rod 32. A piston 3231 is fixedly connected to the outer ring of the baffle 323. The outer wall of the piston 3231 is in contact with the inner wall of the oil cavity 311. A spring 33 is fixedly connected between the bottom end of the baffle 323 and the bottom end of the oil cavity 311. The spring 33 lifts the top plate 121 and makes the step of the base 31 fit and limit the step of the push rod 32, preventing the push rod 32 from sliding out of the oil cavity 311.

[0028] like Figure 2 , Figure 3 , Figure 5 As shown, the mold core 2 has a connecting hole 22 for the ejector pin 32 to pass through. The connecting hole 22 is connected to the molding cavity of the mold core 2. The inner diameter of the connecting hole 22 is equal to the diameter of the ejector pin 32. The portion of the ejector pin 32 inside the connecting hole 22 has several oil grooves 321 on its outer circumference. The oil grooves 321 are annular grooves coaxial with the ejector pin 32, and the outer diameter of the oil grooves 321 is equal to the diameter of the ejector pin 32. The inner diameter of the oil grooves 321 is smaller than the outer diameter of the ejector pin 32. The diameter of the push rod 32, the inner wall of the oil groove 321 and the connecting hole 22 form a closed cavity. An oil passage 322 is opened at the axis of the push rod 32. The oil passage 322 is columnar. The bottom end of the oil passage 322 penetrates the baffle 323 and is connected to the oil cavity 311. The oil cavity 311 is used to store lubricating fluid. The push rod 32 and the oil groove 321 are also provided with a cross-shaped oil passage 322, and are connected to the oil groove 321 through the cross-shaped oil passage 322.

[0029] Its working principle is as follows: When product 21 is injection molded, the upper mold core 2 is separated from the lower mold core 2 under the drive of the external equipment. At this time, product 21 is attached to the lower mold core 2 and needs to be ejected by ejector pin 3. The external equipment drives the top plate 121 to slide, and the top plate 121 drives the ejector rod 32 to slide inside the mold core 2. When the ejector rod 32 contacts product 21, the top plate 121 continues to slide upward. At this time, the spring 33 is compressed, and the bottom end of the ejector rod 32 is embedded in the oil cavity 311. Therefore, the lubricant is squeezed into the oil groove 321. After product 21 is ejected, the ejector rod 32 is reset, and the lubricating oil is collected in the oil cavity 311 through the oil passage 322, ensuring that all the lubricating oil leaves the mold core 2 during injection molding and preventing the lubricating oil from failing at high temperature.

[0030] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An injection mold with an oil groove ejector, characterized in that: The device includes a frame, on which a mold core is fixedly mounted. The mold core is used for injection molding of products. An ejector pin is slidably mounted between the frame and the mold core. The ejector pin passes through the mold core and is used to eject the product from the mold core. The ejector pin has an oil groove for lubricating the mold core and for storing lubricating fluid.

2. The injection mold according to claim 1, characterized in that: The frame has symmetrical fixed frames on both sides, and the mold core is fixedly connected to the end of the fixed frame away from the frame. A sliding cavity for the ejector pin to slide is formed between the frame, the fixed frame and the mold core.

3. The injection mold according to claim 2, characterized in that: A top plate is slidably connected inside the sliding cavity, and the ejector pin is fixed to the top plate. The top plate is used to drive the ejector pin to slide inside the mold core.

4. The injection mold according to claim 3, characterized in that: The ejector pin includes a base fixedly connected to the top plate and an ejector rod connected to the base. The end of the ejector rod away from the base is slidably connected to the mold core. The ejector rod is configured as a columnar rod, and an oil groove is opened on the outer ring of the ejector rod.

5. The injection mold according to claim 4, characterized in that: The mold core has a connecting hole for the ejector rod to slide, and the diameter of the connecting hole is equal to the diameter of the outer ring of the ejector rod.

6. The injection mold according to claim 5, characterized in that: The push rod is slidably connected to the base, and an elastic element connects the push rod and the base. The base has an oil cavity for storing lubricating fluid. The push rod has an oil passage, and its two ends are connected to the oil cavity and the oil groove, respectively.

7. The injection mold according to claim 6, characterized in that: The top of the base is equipped with a guide cylinder for sliding the push rod. The inner diameter of the guide cylinder is equal to the diameter of the push rod. A baffle is provided at the bottom of the push rod. The inner diameter of the oil chamber is larger than the inner diameter of the guide cylinder. The diameter of the baffle is larger than the diameter of the push rod but smaller than the inner diameter of the oil chamber. A piston is provided between the outer ring of the baffle and the inner ring of the oil chamber.

8. The injection mold according to claim 7, characterized in that: The elastic element is set as a spring and connected between the bottom of the oil chamber and the baffle.

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