Exhaust ejector pin

Abstract

The utility model provides an exhaust ejector pin which comprises a base and an exhaust structure, the base is a machining workpiece, and the exhaust structure is a 3D printing workpiece. An exhaust channel is arranged in the base, the exhaust structure is arranged in the base and located at one end of the exhaust channel, a plurality of hole channels are formed in the exhaust structure in an array mode, and gas entering the exhaust channel through the hole channels is exhausted outwards through an exhaust port in the other end of the exhaust channel. A machined part is adopted as a base part of the exhaust ejector pin, only an exhaust structure adopts a 3D printing workpiece, the 3D printing part of the exhaust ejector pin can be reduced, and the production cost of the exhaust ejector pin is reduced; and a plurality of hole channels arranged on the exhaust structure in an array manner can ensure a good exhaust effect.

Description

Technical Field

[0001] The utility model relates to the technical field of 3D printing, in particular to an exhaust ejector pin. Background Art

[0002] The traditional exhaust pin has an exhaust channel set inside, and an exhaust cap is set at one end of the exhaust pin. The exhaust cap is machined to form multiple exhaust grooves for exhaust. The exhaust grooves are usually cut and processed in pieces using a punching method or a wire cutting process. The processing cost is high and the time is long. Multiple exhaust grooves have problems of large apertures and large hole spacing, resulting in poor exhaust effect of the exhaust cap. Moreover, the exhaust grooves are prone to blockage or cracking during use and need to be replaced as a whole. In addition, there are exhaust caps made of breathable steel. Since the breathable steel is formed by high-temperature sintering of fine-grained metal powder, the size, direction, and hole spacing of the micropores on the exhaust cap are random, and the exhaust effect of the exhaust cap is unstable. In addition, the process of grinding or cutting the breathable steel to form the exhaust cap is also prone to clogging the micropores.

[0003] To solve the above problems, some exhaust pins are formed by metal 3D printing. However, due to the long length of the exhaust pins, metal 3D printing has strict requirements on printing materials. The production cost of exhaust pins formed entirely by metal 3D printing is relatively high, which is difficult to meet the low-cost requirements of the mold. Utility Model Content

[0004] In view of the problem of high production cost of 3D printed exhaust pins in the prior art, the utility model provides an exhaust pin, which adopts a machined part as the base part of the exhaust pin, and only the exhaust structure adopts a 3D printed workpiece, which can reduce the 3D printed part of the exhaust pin and reduce the production cost of the exhaust pin; and the multiple channels arranged in an array on the exhaust structure can ensure a good exhaust effect.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] An exhaust ejector pin comprises a base and an exhaust structure, wherein the base is a machined part, and the exhaust structure is a 3D printed workpiece; an exhaust channel is provided in the base, and the exhaust structure is arranged in the base, the exhaust structure is located at one end of the exhaust channel, and the exhaust structure has a plurality of holes arranged in an array, and the gas entering the exhaust channel through the plurality of holes is discharged outward through the exhaust port at the other end of the exhaust channel.

[0007] Furthermore, one end of the exhaust channel away from the exhaust structure is a closed end, the base is provided with an exhaust hole arranged radially along the base, one end of the exhaust hole is connected to the exhaust channel, and the opening at the other end of the exhaust hole is the exhaust port.

[0008] Furthermore, a connection hole is provided at one end of the base away from the exhaust structure, and the base is connected to an external component via a connection piece extending into the connection hole.

[0009] Furthermore, the exhaust passage is arranged to penetrate the base along the length direction of the base, and the opening at the other end of the exhaust passage is the exhaust port.

[0010] Furthermore, the base is connected to an external component via a connecting piece extending into the exhaust passage.

[0011] Furthermore, a limiting cap step with an increased outer diameter is provided at one end of the base away from the exhaust structure.

[0012] Furthermore, the exhaust ejector pin has a length range of 15-450 mm; the exhaust ejector pin has a diameter range of 2-100 mm; and the limiting cap step has a length range of 0-30 mm.

[0013] Furthermore, the exhaust structure has an axial length range of 0.5-30 mm in the exhaust pin direction, and a diameter range of 1-94 mm; the diameter range of the pores is 0.02-0.6 mm, and the pore pitch range of the pores is 0.08-1 mm.

[0014] Furthermore, the diameter of the exhaust channel is smaller than the diameter of the exhaust structure; the base is provided with an inclined step at a transition position between the exhaust channel and the exhaust structure, and an inclination angle formed by the inclined step and the exhaust structure is in a range of 30-80°.

[0015] Furthermore, the exhaust structure is made of martensitic stainless steel.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] 1. The utility model provides an exhaust ejector pin, including a machined base and a 3D printed exhaust structure, wherein an exhaust channel is provided in the base, and a plurality of channels arranged in an array are provided on the exhaust structure; the air in the mold cavity can be discharged outward through the plurality of channels on the exhaust structure and the exhaust channel in the base, and since the exhaust structure is a 3D printed workpiece, the aperture and hole spacing of the plurality of channels on the exhaust structure can be made very small, and the structural strength of the 3D printed exhaust structure is stable, and the plurality of channels are not prone to blockage or cracking and deformation, thereby realizing efficient exhaust of the exhaust ejector pin; and the base is a machined part, which can reduce the production cost of the exhaust ejector pin without affecting the exhaust effect. In addition, when the exhaust structure is blocked, deformed, cracked, and other problems occur during use, the exhaust structure part can be replaced separately, and the entire base mechanism part does not need to be scrapped, thereby reducing costs.

[0018] 2. The utility model provides an exhaust ejector pin, in which one end of the exhaust channel away from the exhaust structure is designed as a closed end, and an exhaust hole is arranged on the base along the radial direction of the base, and one end of the exhaust hole is connected to the exhaust channel; this exhaust method is suitable for exhaust ejectors with slender structures, and can ensure the structural strength and exhaust effect of the slender exhaust ejector pin.

[0019] 3. The utility model provides an exhaust ejector pin, in which an exhaust passage is arranged through the base along the length direction of the base. This exhaust method can be suitable for shorter and thicker exhaust ejectors, and can ensure the structural strength and exhaust effect of the slender exhaust ejector pin.

[0020] 4. The utility model provides an exhaust ejector pin, the exhaust structure of which is formed by 3D printing technology using martensitic stainless steel material, and has the characteristics of high strength, high hardness, good wear resistance and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a cross-sectional view of the overall structure of the exhaust ejector in the first embodiment of the utility model;

[0023] Figure 2 It is a partially enlarged structural cross-sectional view of the exhaust ejector pin in the first embodiment of the utility model;

[0024] Figure 3 This is a cross-sectional view of the overall structure of the exhaust ejector in the first embodiment of the utility model;

[0025] Figure 4 It is a right side view of the first exhaust ejector pin in the utility model;

[0026] Figure 5 It is a right side view of the second exhaust ejector pin in the utility model.

[0027] Explanation of the accompanying symbols: 1. limit cap step; 2. base; 3. exhaust hole; 4. exhaust channel; 5. inclined step; 6. exhaust structure; 7. connecting hole; 8. channel; a. exhaust pin length; b. limit cap step length; c. exhaust structure axial length of the exhaust pin; d. exhaust structure diameter; e. exhaust pin diameter; h. exhaust channel diameter; θ, inclination angle. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. As those skilled in the art can appreciate, the described embodiments can be modified in various ways without departing from the spirit or scope of the utility model. Therefore, the drawings and descriptions are considered to be illustrative in nature and not restrictive.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "vertical", "horizontal", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0031] Embodiment 1

[0032] like Figure 1-2 As shown, the first embodiment of the present invention provides an exhaust ejector pin, including a base 2 and an exhaust structure 6. The base is a long cylindrical machined part, and the exhaust structure 6 is a 3D printed workpiece having a plurality of channels 8 arranged in an array inside. An exhaust channel 4 extending along the length direction of the base 2 is provided inside the base 2, and one end of the exhaust channel 4 in the length direction is a closed end and the other end is an open end. The exhaust structure 6 is fixed inside the base and blocks the open end of the exhaust channel 4. The length direction of the channel 8 of the exhaust structure 6 is arranged along the axial direction of the base 2. An exhaust port connected to the exhaust channel 4 is also provided on the base 2.

[0033] When this exhaust pin is used for exhausting the mold cavity, one end of the base 2 with the exhaust structure 6 extends into the mold cavity, and the air in the mold cavity enters the exhaust channel 4 through multiple channels 8, and then is discharged outward through the exhaust port on the base 2. This exhaust pin is composed of a machined base 2 and a 3D printed exhaust structure 6. Compared with the prior art method in which the entire exhaust pin is made by 3D printing, the production cost of the exhaust pin can be reduced; and the structural strength of the 3D printed exhaust structure 6 is stable, and multiple channels 8 are not prone to blockage or cracking and deformation, thereby achieving efficient exhaust of the exhaust pin; compared with the prior art method of metal 3D printing grafting of the exhaust pin, it avoids the problems of 3D printing not being able to fully align the grafted base and the roughness of the printed surface not meeting the requirements for direct use, thereby reducing the processing difficulty and scrap rate. In addition, when the exhaust structure 6 is blocked, deformed, cracked, and other problems occur during use, the exhaust structure 6 can be replaced separately without scrapping the entire base mechanism, thereby reducing costs.

[0034] In this embodiment, the base 2 is provided with one or more exhaust holes arranged along the radial direction of the base 2, one end of the exhaust hole is connected to the exhaust channel 4, and the opening of the other end of the exhaust hole 3 is an exhaust port. With such a configuration, this exhaust method is suitable for exhaust pins with slender structures, which can ensure the strength and exhaust effect of the slender exhaust pins. A connecting hole 7 is provided at one end of the base 2 away from the exhaust structure 6, and the base 2 is assembled with external components through a connector extending into the connecting hole 7. A limiting cap step 1 with an increased outer diameter is provided at one end of the base 2 away from the exhaust structure 6. The setting of the limiting cap step 1 can increase the structural strength of the part of the base 2 with the connecting hole 7, and ensure the reliability of the connection between the exhaust pin and the external component.

[0035] In some embodiments, the exhaust structure 6 is made of martensitic stainless steel; the exhaust structure 6 formed by 3D printing of martensitic stainless steel has the characteristics of high strength, high hardness, good wear resistance and corrosion resistance. The printing parameters of this exhaust structure 6 in the 3D printing process are: laser power of 60-250W, scanning spacing of 0.05-0.15mm, scanning speed of 300-1500mm / s, printing layer thickness of 0.02-0.08mm, scanning rotation angle of 45-90°, scanning filling method of stripe filling, width of 5-100mm. During the assembly process of the processed base 2 and the exhaust structure 6, the exhaust structure 6 uses the liquid nitrogen shrink assembly method to assemble the interior of one end of the base 2; liquid nitrogen cold treatment can eliminate the internal stress and residual austenite generated by the exhaust structure 6 during the printing process, and improve the dimensional stability and surface hardness of the structure.

[0036] In some embodiments, the exhaust pin length a ranges from 15 to 450 mm; the exhaust pin diameter e ranges from 2 to 100 mm; the limit cap step length b ranges from 0 to 30 mm. The exhaust structure 6 has an axial length c range of 0.5 to 30 mm in the exhaust pin, and an exhaust structure diameter d ranges from 1 to 94 mm; the diameter of the channel ranges from 0.02 to 0.6 mm, and the hole pitch of the channel ranges from 0.08 to 1 mm.

[0037] In some embodiments, the diameter h of the exhaust channel is smaller than the diameter of the exhaust structure 6; the base is provided with an inclined step 5 at the transition position between the exhaust channel and the exhaust structure, and the inclined angle θ formed by the inclined step 5 and the exhaust structure 6 is in the range of 30-80°. The inclined angle θ of the inclined step 5 is set to 30-80°, which can prevent the formation of a structure that hinders exhaust between the exhaust channel 4 and the exhaust structure 6, facilitate the smooth flow of gas from the exhaust structure 6 to the exhaust channel 4, and improve the exhaust efficiency.

[0038] like Figure 4 As shown, the cross-sections of the base 2 and the exhaust structure 6 are both circular, the exhaust structure 6 is embedded and fixed in the base 2, and the multiple channels 8 on the exhaust structure 6 are all circular, and the multiple channels 8 are arranged in an equidistant array. In other embodiments, such as Figure 5 As shown, the cross-sections of the base 2 and the exhaust structure 6 can also be square. This 3D printed exhaust structure 6 can easily form pores 8 arranged in an equidistant array, and the size, direction, and hole spacing of the pores 8 are all controllable, thereby ensuring the exhaust uniformity of the exhaust structure 6. It is also easy to form a larger number of pores 8 with smaller apertures on the exhaust structure 6. Compared with the exhaust structure formed by traditional machining or high-temperature sintering of fine-grained metal powder, it can not only improve the exhaust efficiency while ensuring that the structural strength of the exhaust structure 6 meets the requirements, but also the pores 8 are not prone to blockage or cracking and deformation.

[0039] Embodiment 2

[0040] like Figure 3 As shown, the difference from the first embodiment is that the exhaust channel 4 is arranged through the base 4 along the length direction of the base 2, and the opening at the other end of the exhaust channel 4 is an exhaust port. The base 2 is connected to the external component through a connector extending into the exhaust channel 4. This exhaust method is suitable for shorter and thicker exhaust ejector pins, and can ensure the structural strength and exhaust effect of the slender exhaust ejector pins.

[0041] In summary, the exhaust ejector provided by the embodiment of the utility model has the following advantages:

[0042] 1. The exhaust structure 6 is formed by using martensitic stainless steel material through 3D printing technology, and has the characteristics of high strength, high hardness, good wear resistance and corrosion resistance. The material of the base 2 can be selected arbitrarily according to the use requirements; the exhaust ejector pin can be used in injection molds, die-casting molds, silicone molds, etc.

[0043] 2. The exhaust pin is not limited by the mold structure position and size, and can be designed in different sizes and shapes according to the product shape structure; for different shapes, sizes and structural strength requirements, the internal exhaust channel 4 of the base 2 can use a blind hole structure or a through hole structure.

[0044] 3. When 3D printing the exhaust structure 6, the metal powder is melted layer by layer and solidified by laser selective melting technology. The channel 8 in the exhaust structure 6 is formed along the axial direction of the base 2. Compared with traditional breathable steel, the channel 8 is more uniform and regular, and the exhaust effect is better.

[0045] 4. If the exhaust structure 6 is blocked, deformed, cracked, or has other problems during use, the exhaust ejector pin can be replaced separately without scrapping the entire base mechanism, which can reduce costs.

[0046] 5. The structure is improved under the premise of ensuring the use strength of the exhaust ejector pin, and the overall effective exhaust space of the exhaust structure 6 can be used for exhaust, reflecting the maximum performance and function of the exhaust ejector pin.

[0047] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. Other different forms of changes or modifications can also be made on the basis of the above description. It is not necessary and impossible to list all the implementation modes here. The obvious changes or modifications derived therefrom are still within the protection scope of the invention of the utility model.

Claims

1. An exhaust ejector pin, characterized in that: The invention comprises a base (2) and an exhaust structure (6), wherein the base (2) is a machined part, and the exhaust structure (6) is a 3D printed workpiece; an exhaust channel (4) is provided in the base (2), the exhaust structure (6) is arranged in the base (2), the exhaust structure (6) is located at one end of the exhaust channel (4), and the exhaust structure (6) is provided with a plurality of channels (8) arranged in an array, and the gas entering the exhaust channel (4) through the plurality of channels (8) is discharged to the outside through an exhaust port at the other end of the exhaust channel (4).

2. The exhaust ejector pin according to claim 1, characterized in that: The end of the exhaust channel (4) away from the exhaust structure (6) is a closed end, the base (2) is provided with an exhaust hole (3) arranged radially along the base (2), one end of the exhaust hole (3) is connected to the exhaust channel (4), and the opening at the other end of the exhaust hole (3) is the exhaust port.

3. The exhaust ejector pin according to claim 2, characterized in that: A connection hole (7) is provided at one end of the base (2) away from the exhaust structure (6), and the base (2) is connected to an external component via a connection piece extending into the connection hole (7).

4. The exhaust ejector pin according to claim 1, characterized in that: The exhaust channel (4) is arranged to penetrate the base (2) along the length direction of the base (2), and the opening at the other end of the exhaust channel (4) is the exhaust port.

5. The exhaust ejector pin according to claim 4, characterized in that: The base (2) is connected to an external component via a connecting piece extending into the exhaust channel (4).

6. The exhaust ejector pin according to claim 1, characterized in that: An end of the base (2) away from the exhaust structure (6) is provided with a limiting cap step (1) with an increased outer diameter.

7. The exhaust ejector pin according to claim 6, characterized in that: The exhaust pin length (a) ranges from 15 to 450 mm; the exhaust pin diameter (e) ranges from 2 to 100 mm; and the limit cap step length (b) ranges from 0 to 30 mm.

8. The exhaust ejector pin according to claim 1, characterized in that: The exhaust structure has an axial length (c) in the exhaust pin direction in the range of 0.5-30 mm, and a diameter (d) in the range of 1-94 mm; the diameter of the hole (8) in the range of 0.02-0.6 mm, and a hole pitch of the hole (8) in the range of 0.08-1 mm.

9. The exhaust ejector pin according to claim 1, characterized in that: The diameter (h) of the exhaust channel is smaller than the diameter (d) of the exhaust structure; the base (2) is provided with an inclined step at a transition position between the exhaust channel (4) and the exhaust structure (6); the inclination angle (θ) formed by the inclined step and the exhaust structure (6) is in the range of 30-80°.

10. The exhaust ejector pin according to claim 1, characterized in that: The exhaust structure (6) is made of martensitic stainless steel.

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