Sand core exhaust structure suitable for machining castings on static pressure production line

Abstract

The sand core exhaust structure comprises a lower sand core and an upper sand core, the upper portion of the lower sand core is in butt joint with the upper sand core to form the contour shape of the upper portion of the casting, a cavity is machined in the middle of the upper sand core, and exhaust holes penetrating vertically are formed in the inner bottom face of the cavity of the upper sand core. An exhaust hole is also formed in the corresponding position of the sand box and used for discharging sand core gas, the bottom surface of the cavity is connected with a first plug cover core, an air bag expansion hole and a positioning hole are further machined in the front end and the rear end of the upper sand core cavity, and a second plug cover core is installed on the air bag expansion hole and the positioning hole. The casting produced by applying the exhaust structure is smooth in exhaust in the machining process, the machining quality of casting products is good, the sand core is convenient to take and place by a machine, the working condition of a static pressure production line is realized, the production cost is saved, the production efficiency is improved, and a new sand core design structure idea is particularly provided for machining the casting with a hole-free structure.

Description

Technical Field

[0001] The utility model relates to the technical field of casting structure improvement, in particular to a sand core exhaust structure suitable for processing non-porous structure castings on a static pressure production line. Background Art

[0002] The robot arm casting was originally produced in the furan workshop. In order to save costs and improve production efficiency, the company decided to transfer it to the static pressure production line. According to the process design, there are openings in the lower part of the casting to support the internal sand core and for exhaust. Figure 1 As shown in the figure, there are no openings on the upper part of the casting, so there are two main difficulties in production on the static pressure production line: 1. The sand core is taken and placed by machine, and the existing sand core structure cannot meet the conditions for machine taking and placing; 2. Since the casting skin is relatively thick and thin, gas choking is prone to occur during production, and there are no openings on the upper part of the casting, so exhaust cannot be set. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects in the above-mentioned prior art and provide a sand core exhaust structure suitable for processing castings on a static pressure production line. The sand core is hollowed out and holes are opened at the upper and lower parts for exhaust. Exhaust holes are drilled at the corresponding positions of the lower sand box to discharge the sand core gas to solve the problem that gas choking is easy to occur during production due to the thick skin of the casting and the exhaust cannot be set up due to the lack of openings on the upper part of the casting. An air bag expansion hole is left on the sand core for the machine to take and place the sand core, and finally a plugging core is manually placed to fill the sand core to solve the problem that the existing sand core structure cannot meet the machine taking and placing conditions.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a sand core exhaust structure suitable for processing castings on a static pressure production line, comprising a lower sand core and an upper sand core, an upper sand core correspondingly arranged above the lower sand core to form the contour shape of the upper part of the casting, a cavity processed in the middle of the upper sand core, an exhaust hole penetrating up and down is provided on the bottom surface of the cavity of the upper sand core, and an exhaust hole is also provided at the corresponding position of the sand box for discharging sand core gas, the bottom surface of the cavity is connected to a first plugging core, the first plugging core covers the bottom surface of the cavity so that the docking surface between the upper sand core and the lower sand core is a plane, and airbag expansion holes and positioning holes are also processed at the front and rear ends of the upper sand core cavity, the airbag expansion hole is used for machine to take and place the upper sand core, and a second plugging core is installed on the airbag expansion hole and the positioning hole.

[0005] Further optimization, the cavity is a special-shaped structure, the top surface of the cavity is designed according to the wall thickness of the outer wall shape of the upper sand core, and a reinforcement structure is provided in the middle. The inner bottom surface of the cavity is a planar structure surrounding the outer peripheral band of the cavity, and a groove is provided on the outer periphery of the inner bottom surface to match the concave and convex of the first plugging core. The inner bottom surface of the cavity is higher than the docking surface of the upper sand core and the lower sand core, and the exhaust hole is provided on the inner bottom surface.

[0006] Compared with the prior art, the cast produced by the exhaust structure has smooth exhaust in the cast processing process, good cast product processing quality, and the sand core is convenient for machine taking and placing to realize the operation condition of the static pressure production line, saves the production cost and improves the production efficiency, and especially provides a new sand core design structure idea for processing the castings without hole structure. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is a schematic view of the upper structure of the castings.

[0008] Figure 2 It is a schematic view of the sand core section structure.

[0009] Figure 3 It is a schematic view of the upper sand core structure.

[0010] Figure 4 It is a schematic view of the upper sand core structure.

[0011] Mark in the figure: 1-upper sand core, 2-lower sand core, 3-cavity, 4-exhaust hole, 5-air bag inflation hole, 6-positioning hole, 7-first plug cover core, 8-second plug cover core, 301-inner bottom surface. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations. The "top surface", "bottom surface" direction described herein refers to the same direction as the Figure 2 View direction.

[0013] As Figures 2 to 4As shown, the utility model provides a sand core exhaust structure suitable for processing castings on a static pressure production line, comprising a lower sand core 2 and an upper sand core 1. The upper sand core 1 is correspondingly arranged above the lower sand core 2 to form the contour shape of the upper part of the casting. A cavity 3 is processed in the middle of the upper sand core 1, and an exhaust hole 4 is provided on the inner bottom surface 301 of the cavity 3 of the upper sand core 1, which passes through the upper and lower parts. An exhaust hole is also provided at the corresponding position of the sand box for discharging sand core gas. The inner bottom surface 301 of the cavity 3 is connected to a first plugging core 7. The first plugging core 7 is flat on the side facing the cavity 3. The opposite side of the first plugging core 7 is designed according to the shape of the casting required by the design. The circumferential contour of the first plugging core 7 is adapted to the inner bottom surface 301 of the cavity 3, and a raised contour is processed on the outermost circumference of the first plugging core 7 to be aligned with the groove corresponding to the cavity 3. The first blocking cover core 7 covers the inner bottom surface 301 of the cavity 3 so that the interface between the upper sand core 1 and the lower sand core 2 is a smooth plane. Air bag expansion holes 5 and positioning holes 6 are also processed at the front and rear ends of the cavity 3 of the upper sand core 1. The air bag expansion holes 5 are used for grabbing when the machine takes and places the upper sand core. The second blocking cover core 8 is installed on the air bag expansion holes 5 and the positioning holes 6. The second blocking cover core 8 makes the surface of the interface between the upper sand core 1 and the lower sand core 2 a smooth plane.

[0014] like Figures 2 to 4 As shown, the cavity 3 is a special-shaped structure. The top surface of the cavity 3 is designed according to the wall thickness of the outer wall shape of the upper sand core 1 and a reinforcement structure is provided in the middle. The inner bottom surface 301 of the cavity 3 is a planar structure surrounding the outer peripheral band of the cavity 3. A groove that is concave and convexly matched with the first plugging core 7 is provided on the outer periphery of the inner bottom surface 301. The inner bottom surface 301 of the cavity 3 is higher than the docking surface of the upper sand core 1 and the lower sand core 2 for assembling the first plugging core 7, and the exhaust hole 4 is provided on the inner bottom surface 301.

[0015] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A sand core exhaust structure suitable for processing castings in a static pressure production line, characterized by: It includes a lower sand core and an upper sand core, an upper sand core is arranged above the lower sand core, a cavity is processed in the middle of the upper sand core, and an exhaust hole is provided on the bottom surface of the upper sand core cavity, which passes through the upper and lower parts. An exhaust hole is also provided at the corresponding position of the sand box. The bottom surface of the cavity is connected to the first plugging cover core, and the first plugging cover core covers the bottom surface of the cavity so that the docking surface between the upper sand core and the lower sand core is a plane. Air bag expansion holes and positioning holes are also processed at the front and rear ends of the upper sand core cavity. The air bag expansion holes are used for machine to take and place the upper sand core, and the second plugging cover core is installed on the air bag expansion holes and the positioning holes.

2. The sand core exhaust structure suitable for processing castings in a static pressure production line according to claim 1, characterized in that: The cavity is a special-shaped structure. The top surface of the cavity is designed according to the shape of the outer wall of the upper sand core and the wall thickness, and a reinforcement structure is provided in the middle. The inner bottom surface of the cavity is a planar structure surrounding the outer periphery of the cavity. A groove is provided on the outer periphery of the inner bottom surface to match the concave and convex shape of the first plugging core. The inner bottom surface of the cavity is higher than the docking surface of the upper sand core and the lower sand core, and the exhaust hole is provided on the inner bottom surface.

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