CN211803674U - Core making mold of engine cylinder cover - Google Patents

Abstract

The utility model discloses a make core mould of engine cylinder lid, including the shaping core box, the shaping core box includes the lower core box, can cover the last core box that closes the lower core box, and the shaping core box has the die cavity, and the die cavity is including the last die cavity of locating the upper core box and locating the lower die cavity of lower core box. The upper core box is provided with an exhaust gap channel with two ends respectively penetrating through the upper cavity and the external environment. The upper core box is also provided with an upper core ejecting through hole. The lower core box is provided with a lower core ejecting through hole. The upper core ejecting seat is fixed with an upper core ejecting rod and used for being inserted into the upper core ejecting through hole from top to bottom so as to separate the sand core from the upper cavity; the lower core ejecting seat is fixed with a lower core ejecting rod. The sand shooting plate is detachably connected with the upper core box, and the pressing mechanism is detachably connected with the upper core box. Exhausting air through the exhaust gap channel to enable the sand to fully enter the cavity; thereby improving the quality of the sand core; and finally, the yield is improved.

Description

Core making mold of engine cylinder cover

Technical Field

The utility model relates to the technical field of mold, especially, relate to the system core mould of engine cylinder lid.

Background

When the cylinder cover is formed by the cylinder cover core manufacturing center through a mold, sand needs to be injected into a cavity of the mold through a sand injection nozzle, and therefore the cylinder cover is formed by the sand through a series of processes. The water jacket of the cylinder cover is thin, so that when sand is injected into the mold cavity, the sand is difficult to enter the water jacket cavity of the mold, and particularly, the sand is difficult to enter the water jacket cavity of the mold because the gas is blocked in the cavity and cannot be discharged. Moreover, after the sand is molded into the sand core, the water jacket part is also relatively thin, so that the sand core is difficult to be demoulded; the fracture phenomenon is easy to occur when the mold is forcibly removed.

That is, the existing core-making mold has the following disadvantages when manufacturing the cylinder cover:

1. the sand is difficult to enter the cavity of the mold, the strength of the sand core is poor, the sand core is easy to crack or break, the product quality is poor, and the rejection rate is high.

2. The sand core is difficult to be demoulded, and particularly the water jacket part of the air cylinder is easy to be damaged during demould, so that the rejection rate of the sand core is higher.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model aims to provide an engine cylinder lid's system core mould, its rejection rate that can reduce the psammitolite improves the yield of psammitolite and the quality of psammitolite promptly.

The purpose of the utility model is realized by adopting the following technical scheme:

the core making mold of the engine cylinder cover comprises a forming core box, wherein the forming core box comprises a lower core box and an upper core box capable of covering the lower core box, the forming core box is provided with a cavity, and the cavity comprises an upper cavity arranged on the upper core box and a lower cavity arranged on the lower core box; the upper core box is provided with an exhaust gap channel, two ends of the exhaust gap channel respectively penetrate through the upper cavity and the external environment; the upper core box is also provided with an upper core jacking through hole, and two ends of the upper core jacking through hole are respectively communicated with the cavity and the external environment; the lower core box is provided with a lower core ejecting through hole, and two ends of the lower core ejecting through hole are respectively communicated with the lower cavity and the external environment;

the core making die of the engine cylinder cover further comprises an upper core ejecting seat, an upper core ejecting rod is fixed on the upper core ejecting seat, and the upper core ejecting seat is used for being inserted into the upper core ejecting through hole from top to bottom so as to enable the sand core to be separated from the upper cavity;

the core making die of the engine cylinder cover further comprises a lower top core seat, a lower top core rod is fixed on the lower top core seat, and the lower top core seat is used for being inserted into the lower top core through hole from bottom to top so as to enable the sand core to be separated from the lower cavity;

the core making die of the engine cylinder cover further comprises a sand shooting plate detachably connected with the upper core box and a squeezing mechanism detachably connected with the upper core box; the sand shooting plate is used for connecting the upper core box so that a sand shooting nozzle of the sand shooting plate can shoot sand in the cavity; the extrusion mechanism is used for extruding the upper core ejecting seat downwards.

Further, a water jacket cavity of the upper cavity is arranged right below the upper top core through hole.

Furthermore, the upper core box is also provided with a guide through hole, the upper core ejecting seat is also provided with guide rods which are parallel to the upper core ejecting rod and are arranged at intervals, and the top of each guide rod is fixedly connected with the top of the upper core ejecting rod; the guide rod is matched with the guide through hole and can move along the axial direction of the guide through hole; the length of the guide rod is greater than that of the guide through hole; the length of the upper ejector core rod is greater than that of the upper ejector core through hole; when the guide rod moves downwards along the guide through hole and abuts against the lower core box, the bottommost part of the upper core jacking rod is flush with the bottommost part of the upper core jacking through hole.

Furthermore, the top of the upper ejector core seat is a special-shaped disc, and the upper ejector core rod and the guide rod are fixed on the special-shaped disc; the upper core box is provided with a special-shaped counter bore right above the guide through hole and the upper core ejecting through hole, and the special-shaped disc is sleeved with the special-shaped counter bore in a sliding manner.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. because the two ends of the exhaust gap channel of the upper core box are respectively communicated with the upper cavity and the external environment, the exhaust gap channel can be used for air to pass through, and the width of the exhaust gap channel is smaller than the diameter of sand, when sand is injected into the cavity by the sand shooting nozzle of the sand shooting plate, the air remained in the cavity can escape to the external environment along the exhaust gap channel, and the sand cannot escape to the external environment along the exhaust gap channel; therefore, the filling of the cavity by the sand is facilitated, the quality of the sand core is higher after the sand is formed into the sand core, and the sand core has high strength and is not easy to break, so that the yield is greatly improved.

2. The utility model discloses in, when taking out the sand core from the die cavity, will unload the board that penetrates earlier, then install extrusion mechanism directly over the supreme core box and push down to last core print seat. Then, according to the specific driving mode of the mold, for example, the upper core box is lifted upwards, so that the upper core ejecting seat extrudes the sand core downwards from the upper cavity (namely, the sand core and the upper cavity are loosened and separated), and the sand core is only embedded in the lower cavity at the moment. And then the core rod is moved upwards to enable the sand core to be loosened and separated from the lower cavity. Furthermore, the quality of the formed sand core is improved and the strength is higher due to the exhaust effect of the exhaust gap channel; and the process that the sand core is separated from the die can be more stable and the vibration amplitude is lower through the matching of the upper ejector core rod and the lower ejector core rod, so that the weak position of the cylinder cover is not easy to break in the process that the sand core of the cylinder cover is separated from the die, and the yield is further greatly improved.

Drawings

Fig. 1 is a schematic structural view of a core making mold of an engine cylinder head according to the present invention;

FIG. 2 is a cross-sectional view of a core forming die of the engine head shown in FIG. 1;

FIG. 3 is an exploded view of FIG. 2 (with only the upper mandrel holder in an exploded condition);

fig. 4 is a partially enlarged view of a portion a shown in fig. 2.

In the figure: 1. molding a core box; 11. a core box is arranged; 111. an exhaust gap passage; 112. an upper core through hole; 113. a guide through hole; 114. a special-shaped counter bore; 12. a lower core box; 13. a cavity; 14. an upper core jacking seat; 141. the core rod is jacked up; 142. a guide bar; 15. a lower core jacking seat; 151. pushing the core rod downwards; 2. a sand shooting plate; 3. and (4) an extrusion mechanism.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Fig. 1-4 show the core making mold of the engine cylinder cover according to a preferred embodiment of the present invention, which includes the forming core box 1, the forming core box 1 includes the lower core box 12, the upper core box 11 capable of covering the lower core box 12, the forming core box 1 has the cavity 13, and the cavity 13 includes the upper cavity 13 disposed on the upper core box 11 and the lower cavity 13 disposed on the lower core box 12. The upper core box 11 is provided with an exhaust gap channel 111, two ends of which respectively penetrate through the upper cavity 13 and the external environment, and the width of the exhaust gap channel 111 is preferably smaller than the diameter of sand; the upper core box 11 is also provided with an upper core ejecting through hole 112 with two ends respectively penetrating to the cavity 13 and the external environment; the lower core box 12 is provided with a lower core ejecting through hole with two ends respectively penetrating through the lower cavity 13 and the external environment. Obviously, the exhaust slit passage 111, the upper core through hole 112, and the lower core through hole each preferably extend in the vertical direction; i.e. it should allow the extension of the three to be at an angle to the vertical.

The core making mold of the engine cylinder cover further comprises an upper top core seat 14, an upper top core rod 141 is fixed on the upper top core seat 14, and the upper top core seat 14 is used for being inserted into the upper top core through hole 112 from top to bottom so as to enable the sand core to be separated from the upper cavity 13;

the core making die of the engine cylinder cover further comprises a lower top core seat 15, a lower top core rod 151 is fixed on the lower top core seat 15, and the lower top core seat 15 is used for being inserted into a lower top core through hole from bottom to top so as to enable the sand core to be separated from the lower cavity 13;

the core making mould of the engine cylinder cover also comprises a sand shooting plate 2 which is detachably connected with the upper core box 11, and a squeezing mechanism 3 which is detachably connected with the upper core box 11 (preferentially, only one sand shooting plate 2 and one squeezing mechanism 3 can be matched with the upper core box 11 to work at the same time); the sand shooting plate 2 is used for jointing the upper core box 11 so that a sand shooting nozzle of the sand shooting plate 2 can shoot sand in the cavity 13; the pressing mechanism 3 is used to press the upper mandrel holder 14 downward.

When the sand core molding machine works, according to the existing process flow, after the upper core box 11 covers the lower core box 12, the sand shooting plate 2 is pressed on the upper core box 11, the sand shooting plate 2 is connected with a sand shooting nozzle, sand is injected into the cavity 13 through the sand shooting nozzle, and after the sand in the cavity 13 is molded into the sand core, the sand core needs to be taken out of the mold.

However, it should be emphasized that, in the present invention, since the two ends of the exhaust gap channel 111 of the upper core box 11 are respectively communicated with the upper cavity 13 and the external environment, and the exhaust gap channel 111 can be used for air to pass through and the width of the exhaust gap channel 111 is smaller than the diameter of sand, when sand is injected into the cavity 13 by the sand shooting nozzle of the sand shooting plate 2, the air remained in the cavity 13 can escape to the external environment along the exhaust gap channel 111, and the sand cannot escape to the external environment along the exhaust gap channel 111 (it should be allowed that, according to a reasonable understanding, it is not required that all the sand absolutely cannot penetrate the exhaust gap channel 111, but it is only required that it reasonably prevents most of the sand from escaping through the exhaust gap channel 111, or it can be understood that the average diameter of all the sand is larger than the width of the exhaust gap channel 111); therefore, the cavity 13 is filled with sand, the sand core is formed into a sand core, the quality of the sand core is high, the sand core has high strength and is not easy to break, and the yield is greatly improved. The action of the squeezing mechanism 3 needs to be repeated, because the upper core rod 141 should be kept in a static state during the sand shooting process of the sand shooting plate 2; the core removing process requires downward extrusion of the upper core holder 14, and the process is effectively satisfied by the detachable manner of the extrusion mechanism 3. Obviously, the pressing mechanism 3 is preferably composed of a plate member and a plurality of rod members for pressing down the upper mandrel holder 14, respectively.

In addition, in the present invention, when the core is taken out from the cavity 13, the sand shooting plate 2 is removed first, and then the pressing mechanism 3 is installed right above the upper core box 11 and presses down the upper core ejecting seat 14. Then, according to the specific driving mode of the mold, for example, the upper core box 11 is lifted up, so that the upper core holder 14 extrudes the sand core downward from the upper cavity 13 (i.e., the sand core is loosened and separated from the upper cavity 13), and at this time, the sand core is only embedded in the lower cavity 13. The core is loosened and separated from the lower cavity 13 by moving the upper mandrel 141 upward. It should be additionally emphasized that, because the quality of the formed sand core is improved and the strength is higher under the exhaust effect of the exhaust slit passage 111; and the process that the sand core is separated from the mould can be more stable and the vibration amplitude is lower through the matching of the upper ejector core rod 141 and the lower ejector core rod 151, so that the weak position of the cylinder cover is not easy to break in the process that the sand core of the cylinder cover is separated from the mould, and the yield is further greatly improved.

Here, it should be additionally described that: the upper core carrier 14 is used for being inserted into the upper core through hole 112 from top to bottom, and it should be understood that the upper core carrier 14 can move relative to the upper core through hole 112, that is, which of the upper core carrier 14 and the upper core through hole 112 is in a dynamic state, which of the upper core carrier 14 and the upper core through hole 112 is in a static state, or both of the upper core carrier and the upper core through hole are in a dynamic state, and the function of ejecting the sand core can be realized. In addition, the upper and lower core print 14, 15 may be of a plate-like structure, a disc-like structure, or other regular or irregular structure. Moreover, it should be understood that the number of the upper mandrel rod 141 and the lower mandrel rod 151 should be the same, i.e. at least one, but the two should be the same and arranged opposite to each other; and the other structures are matched in a proper number.

Preferably, the air discharge slit passage 111 is formed between the outer circumferential wall of the upper stem rod 141 and the inner circumferential wall of the upper stem through hole 112. It is apparent that the rough blocking of the upper core through hole 112 by the upper core rod 141 facilitates both the formation of the vent slit passage 111 and the manufacture of the upper core box 11. That is, in addition to this, the minute exhaust gap channels 111 may be formed separately in the upper core box 11, and the minute structure obviously increases the difficulty of the process; therefore, the mode of adopting the upper ejection core rod 141 can facilitate processing, is practical and more practical, consumes slowly, can complete renewal by updating the upper ejection core rod 141, and saves cost. The upper core pin 141 serves to push out the core and also serves as a component for forming the exhaust slit passage 111, thereby serving a dual function.

Preferably, a water jacket cavity 13 of the upper cavity 13 is arranged right below the upper top core through hole 112, and the water jacket cavity 13 is used for forming a water jacket of a cylinder cover (an engine cylinder cover). Obviously, the arrangement is such that the gas in the water jacket cavity 13 of the upper cavity 13 can be exhausted to the external environment, that is, the water jacket cavity 13 of the upper cavity 13 is purposely filled, so that the sand sufficiently fills the water jacket cavity 13 of the upper cavity 13. Thus, after the sand core is formed, the part of the water jacket cavity 13 is greatly lifted; the upper core rod 141 that shuttles through the upper core through hole 112 directly supports and pushes the weak portion (water jacket portion) of the sand core, thereby preventing the weak portion from breaking.

Preferably, the upper core box 11 is further provided with a guide through hole 113, the upper core holder 14 is further provided with a guide rod 142 parallel to and spaced from the upper core rod 141, and the top of the guide rod 142 is fixedly connected with the top of the upper core rod 141. The guide rod 142 is fitted to the guide through hole 113 and is movable in the axial direction of the guide through hole 113. The length of the guide bar 142 is greater than the length of the guide through-hole 113; the length of the upper core ejector rod 141 is greater than the length of the upper core ejector through hole 112 (to ensure that the guide rod 142 can push the sand core so that the sand core is released from the upper cavity 13). When the guide rod 142 moves down along the guide through hole 113 and abuts against the lower core box 12 (obviously, the lower core box 12 plays a limiting role, and also plays a positioning role for the upper core jacking rod 141), the bottommost part of the upper core jacking rod 141 is flush with the bottommost part of the upper core jacking through hole 112; to ensure that the upper core ejector rod 141 just fills the upper core ejector hole, thereby preventing the sand core from forming an unnecessary portion.

Preferably, the top of the upper core holder 14 is a special-shaped disc, and the upper core rod 141 and the guide rod 142 are fixed on the special-shaped disc; the upper core box 11 is provided with a special-shaped counter bore 114 right above the guide through hole 113 and the upper core ejecting through hole 112, and the special-shaped disc is sleeved with the special-shaped counter bore 114 in a sliding manner. Obviously, the profile can be understood as various irregular shapes, and thus, the profile counter bore 114 can play a role in positioning and orientation, so as to facilitate the installation and the looseness prevention of the profile disc. Obviously, the limitation of the guide rod 142 by the lower core box 12 can also be replaced by mutual limitation between the shaped disc and the shaped counter bore 114, such as height limitation of the shaped disc by providing a protrusion in the shaped counter bore 114, etc.

Preferably, the upper core rod 141 and the lower core rod 151 are disposed opposite to each other in a vertical direction; alternatively, the upper core rod 141 and the lower core rod 151 are parallel to each other and arranged at intervals in the horizontal direction.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims (5)

1. The core making mold of the engine cylinder cover comprises a forming core box, wherein the forming core box comprises a lower core box and an upper core box capable of covering the lower core box, the forming core box is provided with a cavity, and the cavity comprises an upper cavity arranged on the upper core box and a lower cavity arranged on the lower core box; the method is characterized in that: the upper core box is provided with an exhaust gap channel, two ends of the exhaust gap channel respectively penetrate through the upper cavity and the external environment; the upper core box is also provided with an upper core jacking through hole, and two ends of the upper core jacking through hole are respectively communicated with the cavity and the external environment; the lower core box is provided with a lower core ejecting through hole, and two ends of the lower core ejecting through hole are respectively communicated with the lower cavity and the external environment;

the core making die of the engine cylinder cover further comprises an upper core ejecting seat, an upper core ejecting rod is fixed on the upper core ejecting seat, and the upper core ejecting seat is used for being inserted into the upper core ejecting through hole from top to bottom so as to enable the sand core to be separated from the upper cavity;

the core making die of the engine cylinder cover further comprises a lower top core seat, a lower top core rod is fixed on the lower top core seat, and the lower top core seat is used for being inserted into the lower top core through hole from bottom to top so as to enable the sand core to be separated from the lower cavity;

the core making die of the engine cylinder cover further comprises a sand shooting plate detachably connected with the upper core box and a squeezing mechanism detachably connected with the upper core box; the sand shooting plate is used for connecting the upper core box so that a sand shooting nozzle of the sand shooting plate can shoot sand in the cavity; the extrusion mechanism is used for extruding the upper core ejecting seat downwards.

2. The engine head coremaking mold of claim 1, wherein: the exhaust gap channel is formed between the outer peripheral wall of the upper ejection core rod and the inner peripheral wall of the upper ejection core through hole.

3. The engine head coremaking mold of claim 2, wherein: and a water jacket cavity of the upper cavity is arranged right below the upper top core through hole.

4. The engine head coremaking mold of claim 2, wherein: the upper core box is also provided with a guide through hole, the upper core ejecting seat is also provided with guide rods which are parallel to the upper core ejecting rod and are arranged at intervals, and the top of each guide rod is fixedly connected with the top of the upper core ejecting rod; the guide rod is matched with the guide through hole and can move along the axial direction of the guide through hole; the length of the guide rod is greater than that of the guide through hole; the length of the upper ejector core rod is greater than that of the upper ejector core through hole; when the guide rod moves downwards along the guide through hole and abuts against the lower core box, the bottommost part of the upper core jacking rod is flush with the bottommost part of the upper core jacking through hole.

5. The engine head coremaking mold of claim 4, wherein: the top of the upper ejector core seat is a special-shaped disc, and the upper ejector core rod and the guide rod are fixed on the special-shaped disc; the upper core box is provided with a special-shaped counter bore right above the guide through hole and the upper core ejecting through hole, and the special-shaped disc is sleeved with the special-shaped counter bore in a sliding manner.

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