Mould exhaust structure and mould

Abstract

The utility model provides a mold exhaust structure and a mold. The mold exhaust structure is used for a sand core mold, and includes an exhaust column arranged on the mold body, and a back-blowing pipe arranged in the exhaust column; an exhaust channel is arranged in the exhaust column, and the exhaust channel is connected to the cavity in the mold body through the exhaust gap at one end of the exhaust column, and is connected to the outside through the exhaust port at the other end of the exhaust column; the back-blowing pipe is inserted into the exhaust channel through the exhaust port, and an exhaust gap is formed between the back-blowing pipe and the inner wall of the exhaust channel, and the back-blowing pipe can be connected to an external air source. Under the air supply of the external air source, the back-blowing pipe can back-blow the exhaust gap in the direction pointing to the cavity. The mold exhaust structure of the utility model can back-blow the exhaust gap through the back-blowing pipe and under the air supply of the external air source, so that the exhaust gap can be purged and cleaned after each sand core molding, so as to avoid the exhaust gap from being blocked, so that the sand shooting exhaust is unobstructed, which is beneficial to ensure the molding quality of the sand core.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, and in particular to a mold exhaust structure. The utility model also relates to a mold provided with the mold exhaust structure. Background Art

[0002] At present, in the mold, especially for the sand core mold for preparing sand core, it is necessary to exhaust when making the core. The better the mold exhaust effect, the fuller and stronger the sand core shot out of the mold. Taking the molding of the oil drain hole on the engine cylinder head as an example, the existing sand core mold exhaust structure does not allow smooth sand shooting and exhaust during sand core molding, resulting in loose sand cores, which in turn causes the oil drain hole position on the cast engine cylinder head to be meaty, making the oil drain hole difficult to process or even fail to process. Utility Model Content

[0003] In view of this, the utility model aims to provide a mold exhaust structure, so as to be able to reversely blow and clean the exhaust gap, thereby facilitating the molding quality of the sand core.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A mold exhaust structure is used for a sand core mold, and comprises an exhaust column arranged on a mold body, and a backflush pipe arranged in the exhaust column;

[0006] An exhaust channel is provided in the exhaust column, and the exhaust channel is connected to the cavity in the mold body through the exhaust gap at one end of the exhaust column, and is connected to the outside through the exhaust port at the other end of the exhaust column;

[0007] The backblowing pipe is inserted into the exhaust channel through the exhaust port, and an exhaust gap is formed between the backblowing pipe and the inner wall of the exhaust channel, and the backblowing pipe can be connected to an external air source. Under the air supply of the external air source, the backblowing pipe can backblow the exhaust gap in a direction pointing into the cavity.

[0008] Furthermore, a quick-connect connector is connected to the back-blowing pipe, and the back-blowing pipe is connected to the external air source through the quick-connect connector; or, a plurality of the exhaust columns are provided on the mold body, and the back-blowing pipes in at least some of the exhaust columns are connected in parallel to the air intake main pipe, and the air intake main pipe is connected to a quick-connect connector, and the air intake main pipe is connected to the external air source through the quick-connect connector.

[0009] Furthermore, the exhaust slits are multiple and are arranged at intervals at the end of the exhaust column.

[0010] Furthermore, the width k of the exhaust gap is between 0.2 mm and 0.35 mm.

[0011] Furthermore, the width k of the exhaust gap is 0.3 mm.

[0012] Furthermore, a vent hole is provided on the side of the vent column, one end of the vent hole is connected to the vent channel, and the other end of the vent hole is connected to the outside through a gap between the vent column and the mold body.

[0013] Furthermore, the exhaust hole is provided at one end of the exhaust gap close to the exhaust column, and the exhaust holes are multiple and distributed along the circumference of the exhaust column.

[0014] Furthermore, a recessed portion is provided on the inner wall of the cavity, the exhaust column is provided in the mold body corresponding to the recessed portion, and the exhaust gap on the exhaust column corresponding to the recessed portion is connected to the recessed portion.

[0015] Furthermore, a draw block is provided in the mold body, and the recessed portion is located on the draw block.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The mold exhaust structure described in the utility model can back-blow the exhaust gap through the back-blow pipe set in the exhaust column and the air supply from the external air source, so that the exhaust gap can be purged and cleaned after each sand core molding to avoid the exhaust gap from being blocked, so that the sand shooting exhaust is unobstructed, which is beneficial to ensure the molding quality of the sand core and has a good use effect.

[0018] In addition, the quick-connect fittings provided on the blowback pipe can facilitate the quick connection of the blowback pipe with an external gas source. Multiple exhaust columns are provided, and the blowback pipes in at least some of the exhaust columns are connected in parallel to the intake pipe, and a quick-connect fitting is provided on the intake pipe, which can facilitate the quick connection of the intake pipe with an external gas source, so that the external gas source can simultaneously supply gas to each blowback pipe through the intake pipe. Multiple exhaust gaps are provided, which is conducive to improving the exhaust effect.

[0019] Secondly, the width of the exhaust gap is limited. On the one hand, it can avoid problems such as air holding during sand shooting, loose sand cores and easy blockage of gaps due to too small gaps. On the other hand, it can avoid defects such as rough surface of sand cores or sand sticking due to too large gaps. The width of the exhaust gap is set to 0.3mm, which ensures the quality of sand core molding and makes the exhaust effect better.

[0020] In addition, the exhaust hole provided on the side of the exhaust column can allow the gas in the exhaust channel to be exhausted to the outside through the exhaust hole and the gap between the exhaust column and the mold body. The exhaust hole is provided near one end of the exhaust column where the exhaust gap is provided, and the exhaust holes are provided as a plurality of holes distributed circumferentially along the exhaust column, which is conducive to the timely discharge of the gas in the cavity. The recessed portion is used to form the protrusions in the sand core. By making the exhaust column correspond to the recessed portion in the mold body, it is conducive to improving the molding quality of the protruding part in the sand core. The recessed portion is arranged on the draw block in the mold body, which can ensure the molding quality of the sand core while facilitating the removal of the formed sand core.

[0021] Another object of the present invention is to provide a mold, wherein the mold is a sand core mold, and the mold is provided with the mold exhaust structure as described above.

[0022] The mold described in the utility model adopts the above-mentioned mold exhaust structure, so that the exhaust gap can be purged and cleaned after each sand core molding to avoid the exhaust gap from being blocked, so that the sand shooting exhaust is unobstructed, which is beneficial to ensuring the molding quality of the sand core. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of the mold exhaust structure according to an embodiment of the utility model from a first perspective;

[0025] Figure 2 It is a structural schematic diagram of the mold exhaust structure according to an embodiment of the utility model from a second viewing angle;

[0026] Figure 3 It is a structural schematic diagram of the exhaust column and the back-blowing pipe in the assembled state according to the embodiment of the utility model;

[0027] Figure 4 for Figure 3 Enlarged view of part A in the middle;

[0028] Figure 5 It is a schematic diagram of the structure of the exhaust column according to an embodiment of the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the mold described in the embodiment of the utility model;

[0030] Figure 7 It is a structural schematic diagram of a cylinder head according to an embodiment of the utility model from a first perspective;

[0031] Figure 8A structural schematic diagram of a cylinder head according to an embodiment of the utility model from a second viewing angle;

[0032] Description of reference numerals:

[0033] 1. Mold body; 2. Exhaust column; 3. Backblowing pipe; 4. Bolt; 5. Intake main pipe; 6. Quick connector; 9. Engine cylinder head; 10. Cavity; 101. Recessed part; 11. Mold base; 12. Side mold drawer; 13. Upper mold; 14. End mold drawer; 20. Exhaust channel; 21. Exhaust gap; 22. Boss; 221. Backing surface; 222. Flange surface; 23. Exhaust hole; 24. Exhaust groove; 91. Oil drain hole; 130. Nozzle hole. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0036] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In addition, in the description of the present invention, unless otherwise clearly defined, the mating parts may be connected by conventional connection structures in the art. Moreover, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Embodiment 1

[0040] This embodiment relates to a mold exhaust structure, which is used for a sand core mold, and in terms of overall structure, is combined with Figures 1 to 5 As shown, the mold exhaust structure mainly includes an exhaust column 2 arranged on the mold body 1, and a backflush pipe 3 arranged in the exhaust column 2.

[0041] Among them, an exhaust channel 20 is provided in the exhaust column 2, and the exhaust channel 20 is connected to the cavity 10 in the mold body 1 through the exhaust gap 21 at one end of the exhaust column 2, and is connected to the outside through the exhaust port at the other end of the exhaust column 2. The backflush pipe 3 is inserted into the exhaust channel 20 through the exhaust port, and an exhaust gap is formed between the backflush pipe 3 and the inner wall of the exhaust channel 20, and the backflush pipe 3 can be connected to an external air source. Under the air supply of the external air source, the backflush pipe 3 can backflush the exhaust gap 21 in the direction pointing to the cavity 10.

[0042] At this time, the utility model can back-blow the exhaust gap 21 through the back-blowing pipe 3 set in the exhaust column 2 and the air supply from the external air source, so that the exhaust gap 21 can be purged and cleaned after each sand core molding to avoid the exhaust gap 21 being blocked, so that the sand shooting exhaust is unobstructed, which is beneficial to ensure the molding quality of the sand core.

[0043] Based on the above overall introduction, the mold exhaust structure of the present invention is described in detail below by taking the sand core mold for molding the engine cylinder head 9 as an example.

[0044] First, the engine cylinder head 9 is structurally Figures 7 and 8 As shown, multiple oil drain holes 91 are arranged at intervals on the intake side and the exhaust side of the engine cylinder head 9. The oil drain hole 91 is an important passage for the high-pressure oil hole to pass through the oil pool cavity, and the cross-section of the oil drain hole 91 is elliptical, the long axis length of the ellipse is usually 5.5 mm, and the short axis length is usually 3.5 mm. It is difficult to form the position of the oil drain hole 91 by sand shooting, and it increases the difficulty of sand core quality. Therefore, it is necessary to ensure that the mold exhaust is smooth at this position.

[0045] For more details, see Figure 6 , and combined with Figures 1 to 5 As shown, in this embodiment, the mold body 1 includes a mold base 11, two side mold drawers 12 and an end mold drawer 14 arranged opposite to each other on the mold base 11, and an upper mold 13. The two side mold drawers 12 are respectively arranged corresponding to the intake side and the exhaust side of the engine cylinder head 9. The mold base 11, the two side mold drawers 12, the end mold drawer 14 and the upper mold 13 together form a cavity 10, and the upper mold 13 is provided with a plurality of nozzle holes 130 connected to the cavity 10. Corresponding to the position of the oil unloading hole on the engine cylinder head 9, an exhaust column 2 is provided on the mold body 1, and a back-blowing pipe 3 is provided in the exhaust column 2.

[0046] In this embodiment, the exhaust column 2 is structurally as follows: Figures 2 to 5 As shown, the exhaust column 2 is hollow inside to form an exhaust passage 20. An exhaust gap 21 is provided at one end of the exhaust column 2, and a boss 22 protruding radially toward itself is provided at the other end. The boss 22 has a stop surface 221 and a flange surface 222 arranged oppositely.

[0047] During the specific installation, the exhaust column 2 is installed in the installation hole on the mold body 1, and is abutted against the mold body 1 through the abutment surface 221. Then, the bolt 4 located on one side of the exhaust column 2 is used, and the bolt 4 is tightened on the template body 1, and the nut of the bolt 4 is pressed on the flange surface 222, so that the exhaust column 2 is fixed in the mold body 1 by the boss 22 at the end and the bolt 4. At this time, in the assembled state, the exhaust channel 20 in the exhaust column 2 is connected to the cavity 10 in the mold body 1 through the exhaust gap 21 at the end, and the exhaust port at the other end of the exhaust column 2 is connected to the outside.

[0048] In addition, corresponding to the end with the exhaust gap 21, as a preferred embodiment, in this embodiment, an exhaust groove 24 is also provided on the end surface of the exhaust column 2, and the exhaust groove 24 is connected with part of the exhaust gap 21, so that the exhaust effect can be further improved. It should be noted that the exhaust groove 24 located on the end surface of the exhaust column 2 can be set according to actual needs.

[0049] Continue to view Figures 2 to 5 As shown, the blowback pipe 3 is inserted into the exhaust channel 20 through the exhaust port, and an exhaust gap is formed between the blowback pipe 3 and the inner wall of the exhaust channel 20. The end of the blowback pipe 3 close to the exhaust gap 21 and the inner surface of the end forming the exhaust gap 21 are spaced apart. In a specific implementation, the spacing can be set to 10 mm, for example. In this way, sufficient space can be left for sandblasting exhaust.

[0050] In order to facilitate the quick connection between the backflush tube 3 and the external gas source, in this embodiment, a quick-connect connector 6 is connected to the backflush tube 3, and the backflush tube 3 is connected to the external gas source through the quick-connect connector 6. It can be understood that when a plurality of exhaust columns 2 are provided on the mold body 1, a backflush tube 3 is provided in each exhaust column 2, and each backflush tube 3 can be connected to a quick-connect connector 6, and is connected to a plurality of external gas sources one by one through the corresponding quick-connect connector 6.

[0051] As a preferred embodiment, in this embodiment, Figure 2 As shown, a plurality of exhaust columns 2 are provided on the mold body 1, and the backflush pipes 3 in at least some of the exhaust columns 2 are connected in parallel to the air intake pipe 5, the air intake pipe 5 is connected with a quick-connection joint 6, and the air intake pipe 5 is connected to an external air source through the quick-connection joint 6. In this way, the air intake pipe 5 can be quickly connected to the external air source, so that the external air source can simultaneously supply air to each backflush pipe 3 through the air intake pipe 5.

[0052] In a specific implementation, the blowback pipe 3 in the multiple exhaust columns 2 located on the intake side of the engine cylinder head 9 is connected in parallel to the first intake main pipe, and the blowback pipe 3 in the multiple exhaust columns 2 located on the exhaust side of the engine cylinder head 9 is connected in parallel to the second intake main pipe. The first intake main pipe and the second intake main pipe are respectively connected with quick-connect connectors 6. At this time, the external air source can be connected only through two quick-connect connectors 6. This is not only conducive to saving the number of quick-connect connectors 6, but also conducive to the arrangement of the external air source. It should be noted here that the external air source can be, for example, an air supply device such as an air pump.

[0053] As a preferred implementation, in this embodiment, Figure 4 As shown, the exhaust gaps 21 are multiple and spaced at the end of the exhaust column 2, which is beneficial to improve the exhaust effect and ensure the quality of sand core molding. Moreover, in this embodiment, the width k of the exhaust gap 21 is between 0.2mm and 0.35mm. The limitation of the width of the exhaust gap 21 can, on the one hand, avoid the problems of air suffocation during sand shooting, loose sand core and easy blockage of the gap due to the gap being too small, and on the other hand, avoid the occurrence of defects such as rough surface of the sand core or sticky sand due to the gap being too large. Moreover, as a more preferred embodiment, in this embodiment, the width k of the exhaust gap 21 is 0.3mm. In this way, the quality of sand core molding can be ensured while making the exhaust effect better.

[0054] On the basis that the exhaust column 2 is provided with an exhaust channel 20 and an exhaust gap 21 is provided at the end, in this embodiment, Figure 3 and Figure 4 As shown, a vent hole 23 is also provided on the side of the vent column 2, one end of the vent hole 23 is connected to the inside of the vent channel 20, and the other end of the vent hole 23 is connected to the outside through the gap between the vent column 2 and the mold body 1. At this time, the vent hole 23 is provided so that the gas in the vent channel 20 can be exhausted to the outside through the vent hole 23 and the gap between the vent column 2 and the mold body 1.

[0055] Moreover, as a further preferred embodiment, in this embodiment, the exhaust hole 23 is close to one end of the exhaust column 2 with an exhaust gap, and the exhaust holes 23 are multiple and distributed along the circumference of the exhaust column 2. This can facilitate the timely exhaust of the gas in the cavity 10.

[0056] In this embodiment, look back Figure 2As shown, a recessed portion 101 is provided on the inner wall of the cavity 10, and an exhaust column 2 is provided in the mold body 1 corresponding to the recessed portion 101, and an exhaust gap 21 on the exhaust column 2 corresponding to the recessed portion 101 is connected to the recessed portion 101. The recessed portion 101 is used to form the protrusion in the sand core, and the protrusion is used to form the part where the oil drain hole 91 is provided on the engine cylinder head 9. At this time, by making the exhaust column 2 correspond to the recessed portion 101 in the mold body 1, it is beneficial to improve the molding quality of the protruding part in the sand core, and also improve the molding quality of the oil drain hole 91 on the engine cylinder head 9.

[0057] Based on the arrangement of the multiple oil drain holes 91 on the air intake side and the air outlet side of the engine cylinder head 9, in this embodiment, two side mold drawers 12 are provided in the mold body 1. Preferably, the above-mentioned recessed portions 101 are located on the two side mold drawers 12. By arranging the recessed portions 101 on the drawers in the mold body, the quality of the sand core molding can be ensured while facilitating the removal of the molded sand core.

[0058] It is understandable that, considering that the recessed portion 101 is set on the bottom end surface of the cavity 10, the formed sand core can be taken out without setting a drawer block, that is, the recessed portion 101 can be directly set on the mold body 1. If the recessed portion 101 is set on the side of the cavity 10, a drawer block needs to be set at this time to facilitate the removal of the formed sand core, and the recessed portion 101 needs to be set on the drawer block in the mold body 1. That is, the setting position of the exhaust column 2 corresponds to the position of the recessed portion 101, and the recessed portion 101 is set according to a module on the mold corresponding to the specific product.

[0059] The mold exhaust structure of this embodiment can use the back-blowing pipe 3 and the external air source to back-blow the exhaust gap 21, so that the exhaust gap 21 can be purged and cleaned after each sand core molding to avoid the exhaust gap 21 being blocked, so that the sand shooting exhaust is unobstructed, which is beneficial to ensure the molding quality of the sand core.

[0060] Embodiment 2

[0061] This embodiment relates to a mold, which is a sand core mold, and the mold exhaust structure of the first embodiment is provided in the mold.

[0062] The mold of this embodiment adopts the mold exhaust structure described in Example 1, and can blow and clean the exhaust gap after each sand core molding to avoid the exhaust gap from being blocked, so that the sand shooting exhaust is unobstructed, which is beneficial to ensuring the molding quality of the sand core.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mold exhaust structure for a sand core mold, characterized in that: The mold exhaust structure comprises an exhaust column (2) arranged on the mold body (1), and a backflush pipe (3) arranged in the exhaust column (2); An exhaust channel (20) is provided in the exhaust column (2), and the exhaust channel (20) is connected to the cavity (10) in the mold body (1) through an exhaust gap (21) at one end of the exhaust column (2), and is connected to the outside through an exhaust port at the other end of the exhaust column (2); The back-blowing pipe (3) is inserted into the exhaust channel (20) through the exhaust port, and an exhaust gap is formed between the back-blowing pipe (3) and the inner wall of the exhaust channel (20), and the back-blowing pipe (3) can be connected to an external air source. Under the air supply of the external air source, the back-blowing pipe (3) can back-blow the exhaust gap (21) in a direction pointing into the cavity (10).

2. The mold exhaust structure according to claim 1, characterized in that: The backflush tube (3) is connected to a quick-connect connector (6), and the backflush tube (3) is connected to the external gas source via the quick-connect connector (6); or, The mold body (1) is provided with a plurality of the exhaust columns (2), and the backflush pipes (3) in at least some of the exhaust columns (2) are connected in parallel to an air intake main pipe (5), a quick-connect connector (6) is connected to the air intake main pipe (5), and the air intake main pipe (5) is connected to the external air source via the quick-connect connector (6).

3. The mold exhaust structure according to claim 1, characterized in that: The exhaust slits (21) are multiple and are arranged at intervals at the end of the exhaust column (2).

4. The mold exhaust structure according to claim 1, characterized in that: The width k of the exhaust gap (21) is between 0.2 mm and 0.35 mm.

5. The mold exhaust structure according to claim 4, characterized in that: The width k of the exhaust gap (21) is 0.3 mm.

6. The mold exhaust structure according to claim 1, characterized in that: An exhaust hole (23) is provided on the side of the exhaust column (2), one end of the exhaust hole (23) is connected to the exhaust channel (20), and the other end of the exhaust hole (23) is connected to the outside through the gap between the exhaust column (2) and the mold body (1).

7. The mold exhaust structure according to claim 6, characterized in that: The exhaust hole (23) is provided with one end of the exhaust gap close to the exhaust column (2), and the exhaust holes (23) are multiple and distributed along the circumference of the exhaust column (2).

8. The mold exhaust structure according to any one of claims 1 to 7, characterized in that: A recessed portion (101) is provided on the inner wall of the mold cavity (10), the exhaust column (2) is provided in the mold body (1) corresponding to the recessed portion, and the exhaust gap (21) on the exhaust column (2) provided corresponding to the recessed portion (101) is communicated with the recessed portion (101).

9. The mold exhaust structure according to claim 8, characterized in that: A draw block is provided in the mold body (1), and the recessed portion (101) is located on the draw block.

10. A mold, characterized in that: The mold is a sand core mold, and the mold exhaust structure according to any one of claims 1 to 9 is provided in the mold.

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