A flywheel casting mold

Abstract

The present invention relates to the technical field of flywheel casting, and specifically to a flywheel casting mold, comprising an upper mold and a lower mold, and also comprising an upper air-exhausting member, the upper air-exhausting member comprising a rotating cylinder 1 rotatably arranged on the upper mold, the rotating cylinder 1 being provided with an air-exhausting hole 1, the bottom of the rotating cylinder 1 being provided with an extrusion sleeve, and a sealing block 1 elastically installed in the rotating cylinder 1 and slidably connected with the extrusion sleeve; a lower air-exhausting member, the lower air-exhausting member comprising a rotating cylinder 2 rotatably arranged on the lower mold, the rotating cylinder 2 being provided with an air-exhausting hole 2, the rotating cylinder 2 being provided with a rectangular guide rod, and the sealing block 2 being elastically installed on the rectangular guide rod; and a locking mechanism, the locking mechanism comprising a handle 1 slidably arranged on the upper mold and a handle 2 arranged on the lower mold, the handle 2 being provided with a limiting mechanism for limiting the movement of the handle 1, the rotating cylinder 1 being provided with a gear, and the handle 1 being provided with a guide column for driving the gear to rotate. The present invention can improve the air-exhausting effect, effectively and timely extract the air in the casting cavity, and can maintain the stability of air-exhausting.

Description

Technical Field

[0001] The invention relates to the technical field of flywheel casting, and in particular to a flywheel casting mold. Background Art

[0002] The flywheel is a disc-shaped part with a large moment of inertia. It is a key safety part of the engine. Its function is to regulate the change in the engine crankshaft speed and stabilize the speed. Currently, for the casting process of the flywheel, sand casting (usually refers to sand casting) and permanent mold casting (also called metal mold casting or hard mold casting) are two commonly used casting processes.

[0003] Sand boxes are needed for sand casting. Traditional sand boxes for sand casting have many casting defects, such as pores, surface wrinkles, cold shuts, slag inclusions, etc., which affect the use and appearance of castings. The reasons for these defects are that the molten steel reacts with oxygen during the filling process, an oxide film and slag are formed on the liquid surface, the sand mold has poor air permeability, and both dry and wet sand molds will be affected by high-temperature water vapor, organic matter decomposition, etc. during pouring to produce gas expansion. Especially at the hot section, the surface of the casting cannot form a hard skin quickly, and the gas pressure invades the casting body when it is greater than the surface tension of the molten steel. For this reason, the China Patent Network has disclosed a sand box for casting with a publication number of CN117773021A, which is named a casting casting pouring sand box. By setting a negative pressure pipe in the lower mold to extract the gas generated during pouring, the casting cavity can be uniformly inhaled to ensure the uniformity of the suction under negative pressure.

[0004] In the above-mentioned public documents, when the negative pressure pipe is extracting gas, since multiple groups of small holes are directly set on the negative pressure pipe, there is a risk of the small holes being blocked by molding sand when making the casting cavity, thereby reducing the air extraction effect and affecting the quality of the casting. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a flywheel casting mold, which can effectively solve the problem in the prior art that the negative pressure pipeline is easily blocked, the air extraction effect is reduced, and the casting is affected.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a flywheel casting mold, comprising an upper mold and a lower mold, and further comprising:

[0008] An upper air-exhausting member, the upper air-exhausting member comprises a rotating cylinder rotatably arranged on the upper mold, and the rotating cylinder is provided with an air-exhausting hole, the bottom of the rotating cylinder is provided with an extrusion sleeve, and a sealing block slidably connected to the extrusion sleeve is elastically installed in the rotating cylinder;

[0009] A lower air-exhausting member, the lower air-exhausting member comprises a second rotating drum rotatably arranged on the lower mold, and the second rotating drum is provided with two air-exhausting holes, the second rotating drum is provided with a rectangular guide rod, and the rectangular guide rod is elastically provided with a second sealing block;

[0010] And a locking mechanism, the locking mechanism includes a handle 1 slidably arranged on the upper mold and a handle 2 arranged on the lower mold, and the handle 2 is provided with a limiting mechanism for limiting the movement of the handle 1, the rotating cylinder 1 is provided with a gear, and a guide column for driving the gear to rotate is slidably installed on the upper mold.

[0011] Furthermore, the upper vacuum parts are provided in multiple groups and are equidistantly distributed on the upper mold, and a part of the upper vacuum parts extends into the molding sand filling cavity of the upper mold, an upper vacuum cavity connected to the multiple groups of upper vacuum parts is provided in the upper mold, and an vacuum pipe connected to the vacuum cavity is provided on the upper mold.

[0012] Furthermore, the lower air pumping parts are provided with multiple groups equidistantly distributed on the lower mold, and a part of the lower air pumping parts extends into the molding sand filling cavity of the lower mold. The lower mold is provided with a lower air pumping cavity connected with the multiple groups of upper air pumping parts.

[0013] Furthermore, the limiting mechanism includes a fixed limiting member arranged on the handle 2 and a movable limiting member slidably arranged in the handle 1, and a lever connected to the movable limiting member is elastically installed in the handle 1, and the lever always pushes the movable limiting member toward the fixed limiting member.

[0014] Furthermore, a rack meshing with the gear is slidably installed in the upper mold, a movable plate is provided on the rack, and a guide groove is provided on the movable plate, and the guide column is connected to the handle and extends into the guide groove.

[0015] Furthermore, the rack is provided with two groups, the guide grooves are obliquely arranged on the movable plate, and the two groups of guide grooves are in an inverted eight-shaped shape. When the guide pillar descends vertically on the upper mold, the movable plates are driven away from each other to drive the upper vacuum part to rotate.

[0016] Furthermore, the rotation angle of the upper air pumping member is 90 degrees.

[0017] Furthermore, a bottom plate is provided at the bottom of the lower mold, and a top plate extending toward the lower mold is provided on the bottom plate, a cover plate is rotatably mounted on the lower mold, and the cover plate extends toward the downward exhaust cavity, and a torsion spring is provided between the cover plate and the lower mold.

[0018] Furthermore, the sealing block 1 is in a pyramid shape, a plurality of groups of air-permeable grooves are arranged on a side surface of the rotating drum, and a funnel-shaped groove is arranged on the bottom of the rotating drum 2.

[0019] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] 1. When the upper mold and the lower mold are locked by the locking mechanism, the guide column drives the rack to drive the first rotating drum to rotate, and cooperates with the extrusion sleeve to drive the second rotating drum to rotate, which can prevent the molding sand from entering the first rotating drum and the second rotating drum when making the casting cavity. At the same time, during pouring, the first exhaust hole and the second exhaust hole can be kept facing the casting cavity, which improves the exhaust effect, effectively and timely extracts the air in the casting cavity, and does not need to set up an additional exhaust hole connected to the outside world, which effectively prevents the formation of oxide film and oxide slag on the liquid surface;

[0021] Second, through the special structure inside the drum one and the drum two, the sucked molding sand is guided to fall into the lower exhaust cavity in the lower mold and finally fall onto the bottom plate. After the casting is completed, the lower mold and the bottom plate are separated to remove the molding sand, which is convenient for cleaning the molding sand in the drum one and the drum two, preventing the accumulation of molding sand in the drum one and the drum two from affecting the exhaust efficiency, and maintaining the stability of exhaust when casting workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the present invention when exhausting gas;

[0025] Figure 3 It is a schematic diagram of the structure explosion of the present invention;

[0026] Figure 4 is a cross-sectional view of the upper air extraction member of the present invention;

[0027] Figure 5 is a cross-sectional view of the lower air extraction member of the present invention;

[0028] Figure 6 It is a cross-sectional view of the upper air pumping member and the lower air pumping member of the present invention when they are matched;

[0029] Figure 7 This is a schematic diagram of the connection between the handle 1 and the transmission assembly of the present invention;

[0030] Figure 8 A partial cross-sectional view of the locking mechanism of the present invention;

[0031] Fig. 9 It is a partial cross-sectional view of the lower mold and the bottom plate of the present invention.

[0032] : 1. upper mold; 11. exhaust pipe; 2. lower mold; 21. cover plate; 3. bottom plate; 31. top plate; 4. locking mechanism; 41. handle one; 411. gear; 412. rack; 413. movable plate; 4131. guide groove; 414. guide column; 42. handle two; 43. fixed limit member; 44. movable limit member; 45. lever; 5. upper exhaust member; 51. rotating drum one; 511. exhaust hole one; 52. extrusion sleeve; 521. ventilation groove; 53. sealing block one; 531. ventilation hole; 54. elastic member one; 6. lower exhaust member; 61. rotating drum two; 611. exhaust hole two; 62. sealing block two; 63. elastic member two; 64. rectangular guide rod. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention will be further described below in conjunction with the embodiments.

[0035] See attached Figure 1-Figure 9 A flywheel casting mold includes an upper mold 1 and a lower mold 2. The runner and the riser are prior art (not shown in the figure) and will not be described in detail here. The mold also includes:

[0036] The upper air-exhausting member 5 is provided with a plurality of groups and is evenly distributed on the upper mold 1, and a part of the upper air-exhausting member 5 extends into the molding sand filling cavity of the upper mold 1, and an upper air-exhausting cavity connected with the plurality of groups of upper air-exhausting members 5 is provided in the upper mold 1, and an air-exhausting pipe 11 connected with the air-exhausting cavity is provided on the upper mold 1, and the upper air-exhausting member 5 includes a rotating drum 51 rotatably arranged on the upper mold 1, and the rotating drum 51 is provided with an air-exhausting hole 511, and the air-exhausting hole 511 is used to extract gas, and an extrusion sleeve 52 is provided at the bottom of the rotating drum 51, and a plurality of air-permeable grooves 5 are provided on the side of the extrusion sleeve 52 21, and a sealing block 53 slidably connected to the extrusion sleeve 52 is elastically installed in the rotating drum 51, and the sealing block 53 is slidably arranged on the upper air-extracting member 5 through a rectangular column, and an elastic member 54 is sleeved on the rectangular column, and the elastic member 54 is used to push the sealing block 53 to cover the extrusion sleeve 52, wherein the sealing block 53 is provided with a plurality of groups of air holes 531, and the inner wall of the extrusion sleeve 52 is provided with a plurality of groups of columnar strips matched with the air holes 531, and after the sealing block 53 is lifted up and separated from the columnar strips, the rotating drum 51 and the extrusion sleeve 52 are connected;

[0037] The lower air-exhausting member 6 is provided with a plurality of groups of lower air-exhausting members 6 and is equidistantly distributed on the lower mold 2, and a part of the lower air-exhausting member 6 extends into the molding sand filling cavity of the lower mold 2, and a lower air-exhausting cavity connected with the plurality of groups of upper air-exhausting members 5 is provided in the lower mold 2, and the lower air-exhausting member 6 comprises a second rotating cylinder 61 rotatably arranged on the lower mold 2, and a second air-exhausting hole 611 is provided on the second rotating cylinder 61, and the second air-exhausting hole 611 is used to extract gas, and a rectangular guide rod 64 is provided on the second rotating cylinder 61, and the rectangular guide rod 64 is provided on the inner wall of the second rotating cylinder 61 through a bracket, and a sealing block 62 is elastically mounted on the rectangular guide rod 64, and the sealing block 62 is slidably connected with the rectangular guide rod 64, and an elastic member 63 is provided between the sealing block 62 and the rectangular guide rod 64, and the elastic member 63 is used to always push the sealing block 62 to block the second rotating cylinder 61, wherein a limit block is provided between the second rotating cylinder 61 and the sealing block 62 to prevent the sealing block 62 from being separated from the second rotating cylinder 61;

[0038] And a locking mechanism 4, the locking mechanism 4 includes a handle 1 41 slidably arranged on the upper mold 1 and a handle 2 42 arranged on the lower mold 2, and the handle 2 42 is provided with a limiting mechanism for limiting the movement of the handle 1 41, the limiting mechanism includes a fixed limiting member 43 arranged on the handle 2 42 and a movable limiting member 44 slidably arranged in the handle 1 41, a lever 45 connected to the movable limiting member 44 is elastically installed in the handle 1 41, and the lever 45 always pushes the movable limiting member 44 toward the fixed limiting member 43, a gear 411 is provided on the rotating cylinder 1 51, and a guide column 414 for driving the gear 411 to rotate is provided on the upper mold 1, wherein a rack 412 meshing with the gear 411 is slidably installed in the upper mold 1, a movable plate 413 is provided on the rack 412, and a guide groove 4131 is provided on the movable plate 413, and the guide column 414 is vertically slidably connected to the upper mold 1 and extends into the guide groove 41 When the upper mold 1 is lowered, the guide column 414 drives the movable plate 413 to move away from each other to drive the upper air pump 5 to rotate. In addition, the upper air pump 5 rotates at an angle of 90 degrees. In the initial state, the air pump hole 511 on the rotating drum 51 faces the upper mold 1. When the molding sand in the upper mold 1 is filled and ready for pouring, the upper mold 1 and the lower mold 2 are locked by the locking mechanism 4. At the same time, the rack 412 is driven to rotate the rotating drum 51 by 90 degrees, and then the side of the rotating drum 51 provided with the air pump hole 511 is rotated to the side provided with the molding sand, so as to prevent the molding sand from entering the air pump hole 511 in the rotating drum 51 and blocking it when the molding sand is filled.

[0039] It is worth mentioning that the sealing block 53 is pyramid-shaped, and a funnel-shaped groove is provided at the bottom of the rotating drum 61, which is convenient for guiding the molding sand entering the rotating drum 51 and the rotating drum 61 during vacuuming. A bottom plate 3 is provided at the bottom of the lower mold 2, and a top plate 31 extending to the lower mold 2 is provided on the bottom plate 3. A cover plate 21 is rotatably installed on the lower mold 2, and the cover plate 21 extends to the lower vacuum chamber. A torsion spring is provided between the cover plate 21 and the lower mold 2. After the bottom plate 3 and the lower mold 2 are assembled, the top plate 31 squeezes the cover plate 21 to make it rotate and tilt. When molding sand enters the rotating drum 51 and the rotating drum 61, it is convenient to guide the molding sand to fall. When the bottom plate 3 and the lower mold 2 are separated, the cover plate 21 will be reset under the action of the torsion spring. After the cover plate 21 is reset, it blocks the lower vacuum chamber in the lower mold 2 to prevent dust and molding sand from entering.

[0040] Working principle: Install the lower mold 2 and the bottom plate 3 and fill them with molding sand to shape the flywheel casting cavity, then install the upper mold 1 on the lower mold 2, at this time, the extrusion sleeve 52 at the bottom of the rotating cylinder 51 squeezes the sealing block 62 to retract into the rotating cylinder 61, and the rectangular guide rod 64 in the rotating cylinder 61 squeezes the sealing block 53, so that the sealing block 53 is retracted into the rotating cylinder 51, and cooperates with the air vent 531 on the sealing block 53 and the air vent groove 521 on the extrusion sleeve 52, so that the rotating cylinder 51 and the rotating cylinder 61 are connected, and then the handle 1 41 is pressed down to make it cooperate with the fixed limit piece 43 on the handle 2 42 to lock the upper mold 1 and the lower mold 2. At the same time, the pressed handle 1 41 will drive the guide column 414 to descend to move the rack 412, thereby driving The rotary drum 51 rotates, and since the rotary drum 2 61 is connected to the rotary drum 51 and cannot rotate relative to each other, the rotary drum 2 61 rotates with the rotary drum 51, and the exhaust holes 1 511 and the exhaust holes 2 611 are directed to the side close to the casting cavity. During casting, gas is extracted through the exhaust pipe 11 to extract the gas generated during casting to prevent the molten metal from reacting with oxygen during the filling process and forming an oxide film and oxide slag on the liquid surface. Since some molding sand is inevitably sucked into the rotary drum 51 and the rotary drum 2 61 during exhaust, the special structure inside the rotary drum 51 and the rotary drum 2 61 guides the sucked molding sand to fall into the lower exhaust cavity in the lower mold 2, and finally falls onto the bottom plate 3. After the casting is completed, the lower mold 2 and the bottom plate 3 are separated to remove the molding sand.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flywheel casting mold, comprising an upper mold (1) and a lower mold (2), characterized in that: Also includes: An upper air extraction member (5), the upper air extraction member (5) comprising a rotating drum (51) rotatably arranged on the upper mold (1), the rotating drum (51) being provided with an air extraction hole (511), an extrusion sleeve (52) being provided at the bottom of the rotating drum (51), and a sealing block (53) being elastically mounted in the rotating drum (51) and being slidably connected to the extrusion sleeve (52); A lower air extraction member (6), the lower air extraction member (6) comprising a second rotating drum (61) rotatably arranged on the lower mold (2), the second rotating drum (61) being provided with a second air extraction hole (611), the second rotating drum (61) being provided with a rectangular guide rod (64), and a second sealing block (62) being elastically mounted on the rectangular guide rod (64); and a locking mechanism (4), the locking mechanism (4) comprising a handle 1 (41) slidably arranged on the upper mold (1) and a handle 2 (42) arranged on the lower mold (2), and a limit mechanism for limiting the movement of the handle 1 (41) is provided on the handle 2 (42), a gear (411) is provided on the rotating cylinder 1 (51), and a guide column (414) for driving the gear (411) to rotate is slidably mounted on the upper mold (1).

2. A flywheel casting mold according to claim 1, characterized in that: The upper air suction members (5) are provided in a plurality of groups and are equidistantly distributed on the upper mold (1), and a portion of the upper air suction members (5) extends into the molding sand filling cavity of the upper mold (1). An upper air suction cavity connected to the plurality of groups of upper air suction members (5) is provided in the upper mold (1), and an air suction pipe (11) connected to the air suction cavity is provided on the upper mold (1).

3. A flywheel casting mold according to claim 1, characterized in that: The lower air suction members (6) are provided with a plurality of groups equidistantly distributed on the lower mold (2), and a portion of the lower air suction members (6) extends into the molding sand filling cavity of the lower mold (2). The lower mold (2) is provided with a lower air suction cavity connected to the plurality of groups of upper air suction members (5).

4. A flywheel casting mold according to claim 1, characterized in that: The limiting mechanism comprises a fixed limiting member (43) arranged on the second handle (42) and a movable limiting member (44) slidably arranged in the first handle (41), and a lever (45) connected to the movable limiting member (44) is elastically installed in the first handle (41), and the lever (45) always pushes the movable limiting member (44) towards the fixed limiting member (43).

5. A flywheel casting mold according to claim 1, characterized in that: A rack (412) meshing with a gear (411) is slidably mounted in the upper mold (1), a movable plate (413) is provided on the rack (412), and a guide groove (4131) is provided on the movable plate (413), and the guide column (414) is connected to the handle 1 (41) and extends into the guide groove (4131).

6. A flywheel casting mold according to claim 5, characterized in that: The rack (412) is provided with two groups, and the guide grooves (4131) are arranged obliquely on the movable plate (413), and the two groups of guide grooves (4131) are in an inverted eight-shaped shape. When the guide pillars (414) vertically descend on the upper mold (1), the movable plates (413) are driven to move away from each other to drive the upper air extraction member (5) to rotate.

7. A flywheel casting mold according to claim 6, characterized in that: The rotation angle of the upper air pumping member (5) is 90 degrees.

8. A flywheel casting mold according to claim 3, characterized in that: A bottom plate (3) is provided at the bottom of the lower die (2), and a top plate (31) extending toward the lower die (2) is provided on the bottom plate (3); a cover plate (21) is rotatably mounted on the lower die (2), and the cover plate (21) extends downward toward the air extraction cavity; a torsion spring is provided between the cover plate (21) and the lower die (2).

9. A flywheel casting mold according to claim 1, characterized in that: The sealing block 1 (53) is pyramid-shaped, and a plurality of groups of air-permeable grooves (521) are provided on the side of the rotating drum 1 (51), and a funnel-shaped groove is provided at the bottom of the rotating drum 2 (61).

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