A sand box and a V-method vertical molding system for V-method vertical molding process

Abstract

The present invention discloses a sand box used in a V-method vertical molding process, comprising at least two sand boxes connected end to end, wherein any sand box comprises a frame body and a support frame arranged on the frame body, and the frame body has improved bending strength due to the support of the support frame, and the frame body has strong deformation resistance and a long service life. After being separated by the support frame, the two ends of the frame body form a left mold cavity and a right mold cavity that are independent of each other, and the support frame has a plurality of exhaust chambers that are connected to the exhaust holes arranged on the frame body to perform negative pressure exhaust on the left mold cavity and the right mold cavity, so that the mold cavity volume becomes smaller, and the negative pressure gas can apply negative pressure to the left mold cavity and the right mold cavity from both sides of the support frame, respectively, and the negative pressure application area is increased, which is conducive to uniform exhaust, so that the shape of the sand mold is accurate and reliable, and the casting quality is high. Therefore, the casting quality and service life of the sand box are improved. The present invention provides a V-method vertical molding system including the above-mentioned sand box.

Description

Technical Field

[0001] The present invention relates to the technical field of casting technology, and in particular to a sand box used in a V-method vertical molding process. The present invention also relates to a V-method vertical molding system including the sand box used in the V-method vertical molding process. Background Art

[0002] V-molding uses a plastic film to separate the dry sand without binder in the sand box from the outside world, and then uses a vacuum pump to extract the air in the sand mold so that the sand mold maintains a specific shape under negative pressure. V-molding currently mainly includes V-molding horizontally and V-molding vertically.

[0003] Among them, V-method horizontal molding includes negative pressure laminating, sand box filling, box flipping and demolding, mold closing and pouring, and stopping of air extraction, while the sand box of V-method vertical molding is usually placed vertically so that dry sand can be vertically injected into the sand box from the top of the sand box, and demolding can avoid flipping the sand box. Compared with V-method vertical molding, V-method horizontal molding involves more processes and requires frequent flipping of the sand box, which makes the production efficiency of V-method horizontal molding low, laying the foundation for the widespread application of V-method vertical molding.

[0004] The existing sand box used in the V-method vertical molding process includes a positive pressure plate with a left half mold, a back pressure plate with a right half mold, and a sand box arranged between the positive pressure plate and the back pressure plate and having a hollow mold cavity. The right side surface of the left half mold, the hollow mold cavity and the left side surface of the right half mold can form a closed molding cavity consistent with the outer contour shape of the pre-prepared casting after laminating and mold closing. The closed molding cavity is filled with sand and evacuated to form a sand mold with an ideal shape.

[0005] Usually, the side of the sand box is provided with an exhaust hole connected to the hollow mold cavity, so that the vacuum pump can exhaust the hollow mold cavity through the exhaust hole. However, due to the large volume of the hollow mold cavity, the limited number of exhaust holes can only exhaust the hollow mold cavity from the periphery of the hollow mold cavity, and it is difficult to evenly exhaust the entire hollow mold cavity, which means that the negative pressure distribution of the sand mold is uneven, which seriously affects the shape of the sand mold, thereby affecting the casting quality of the pre-prepared casting; further, the excessively large volume of the hollow mold cavity also weakens the bending strength of the sand box, causing the sand box to be easily deformed or damaged during long-term use, and the service life is relatively short.

[0006] Therefore, how to improve the casting quality and service life of the sand box in the existing V-method vertical molding process is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a sand box applied to a V-method vertical molding process, wherein a support frame supports a frame body, and negative pressure gas can apply negative pressure to the left mold cavity and the right mold cavity from both sides of the support frame, so that the service life and casting quality of the sand box are improved. The present invention also provides a V-method vertical molding including a sand box applied to a V-method vertical molding process, which has high production efficiency.

[0008] The specific plan is as follows:

[0009] The present invention provides a sand box used in a V-method vertical molding process, comprising at least two sand boxes connected end to end, wherein any sand box comprises a frame body and a supporting skeleton arranged on the frame body, and the two ends of the frame body form a left mold cavity and a right mold cavity independent of each other after being separated by the supporting skeleton, and the supporting skeleton has a plurality of exhaust chambers connected with the exhaust holes arranged on the frame body to perform negative pressure exhaust on the left mold cavity and the right mold cavity.

[0010] Preferably, after any two adjacent flasks are molded together, the left mold cavity of one flask cooperates with the right mold cavity of the other flask to form a molding cavity whose contour shape is consistent with the contour shape of the pre-prepared casting.

[0011] Preferably, the supporting frame includes a plurality of longitudinal support plates and transverse support plates intersecting vertically and horizontally to form a plurality of air extraction chambers, and all the air extraction chambers are interconnected and have equal volumes.

[0012] Preferably, a sand partition for preventing sand from penetrating into the vacuum chamber is provided between the support frame and the left mold cavity and between the support frame and the right mold cavity. The sand partition has negative pressure air holes for allowing negative pressure gas to flow only from the vacuum chamber into the left mold cavity or the right mold cavity.

[0013] Preferably, a left support plate and a right support plate for supporting the sand partition are correspondingly provided on the left and right sides of each sand partition, and both the left support plate and the right support plate are provided with ventilation holes connected to the negative pressure air holes.

[0014] Preferably, a plurality of left sand shooting holes and right sand shooting holes are provided on the top of the sand box, which are respectively connected with the left mold cavity and the right mold cavity to realize vertical sand shooting.

[0015] Preferably, all left sand shooting holes and all right sand shooting holes are evenly distributed along a straight line.

[0016] Preferably, it also includes a sealing member disposed between the supporting frame and the frame body to seal the gap therebetween.

[0017] Preferably, the air extraction hole is provided with a normally closed switch.

[0018] The present invention also provides a V-method vertical molding system, comprising a positive pressure plate with a left half mold, a back pressure plate with a right half mold and the above-mentioned sand box applied to the V-method vertical molding process, the left half mold cooperates with the left mold cavity to form a left sand mold, the right half mold cooperates with the right mold cavity to form a right sand mold, and the adjacent left sand mold and right sand mold cooperate to form a sand mold whose outer contour shape is consistent with the contour shape of the pre-prepared casting.

[0019] Compared with the background technology, the key improvement point of the sand box applied to the V-method vertical molding process provided by the present invention is to optimize the structure of the sand box. On the one hand, a support skeleton is added to the frame body of the sand box so that the support skeleton can support the frame body, and the bending strength of the frame body is improved, thereby reducing the risk of deformation of the frame body, and the service life of the frame body is naturally improved; on the other hand, the support skeleton is connected to the exhaust hole set by the frame body, and after being separated by the support skeleton, the two ends of the frame body form a left mold cavity and a right mold cavity that are independent of each other, which is equivalent to using the support skeleton to separate the hollow mold cavity of the existing sand box into two independent mold cavities, and the volume of the mold cavity becomes smaller, which is conducive to the left mold cavity and the right mold cavity to achieve uniform exhaust; further, when a vacuum pump is used to exhaust air from the exhaust hole, the negative pressure gas can apply negative pressure to the left mold cavity and the right mold cavity from both sides of the support skeleton, and the negative pressure application area is increased, which is conducive to further achieving uniform exhaust, ensuring that the shape of the sand mold is accurate and reliable, thereby improving the casting quality.

[0020] Therefore, the sand box used in the V-method vertical molding process provided by the present invention can effectively improve the casting quality and service life of the sand box.

[0021] The V-method vertical molding provided by the present invention includes a sand box applied to the V-method vertical molding process. Since the optimization of the sand box improves the yield rate, the production efficiency is naturally higher. 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 description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A structural diagram of a sand box used in a V-method vertical molding process provided by the present invention;

[0024] Figure 2 For application Figure 1 The mold closing state diagram of the sand box in the figure;

[0025] Figure 3 For application Figure 1 The demoulding state diagram of the sand box in FIG.

[0026] Figure 4 For application Figure 3 Assembly state diagram of the sand mold formed in the process.

[0027] The reference numerals are as follows:

[0028] Sand box 1, positive pressure plate 2 and counter pressure plate 3;

[0029] The frame body 11 and the supporting skeleton 12;

[0030] Air extraction hole 111, left sand injection hole 112 and right sand injection hole 113;

[0031] The right mold cavity 121, the exhaust chamber 122, the longitudinal support plate 123, the transverse support plate 124, the sand partition plate 125, the left support plate 126 and the right support plate 127;

[0032] Vent 1261. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Please refer to Figure 1 , Figure 1 This is a structural diagram of the sand box provided by the present invention for use in the V-method vertical molding process.

[0036] The embodiment of the present invention discloses a sand box applied to a V-method vertical molding process, and the key invention point is to optimize the structure of the sand box 1 to improve the casting quality and service life.

[0037] The present invention comprises at least two sand boxes 1 connected end to end, the two sand boxes 1 cooperate to form a complete sand mold, the number of the sand boxes 1 is determined according to the required number of sand molds, which is convenient for mass production and has high production efficiency.

[0038] Any flask 1 comprises a frame body 11 and a support frame 12. In this specific embodiment, the frame body 11 is in a cubic shape, comprising a top side plate, a bottom side plate, a left side plate and a right side plate, thereby enclosing a hollow mold cavity with two ends open.

[0039] The support frame 12 is arranged in the frame body 11 to provide conditions for realizing the V-shaped vertical shape. Preferably, the frame body 11 is vertically arranged in the support frame 12. Furthermore, the support frame 12 realizes supporting the frame body 11, effectively improving the bending strength of the frame body 11, thereby reducing the risk of deformation of the frame body 11, and the service life of the frame body 11 is naturally improved. In this specific embodiment, the support frame 12 can be fixed in the frame body 11 by welding or bolting.

[0040] The present invention further includes a seal provided between the support frame 12 and the frame body 11, so that the seal seals the gap between the support frame 12 and the frame body 11, ensures that the left mold cavity and the right mold cavity 121 are completely independent, prevents deformation of the sand mold, and is conducive to improving the casting quality. In this specific embodiment, the seal can be a rubber seal ring, but is not limited thereto.

[0041] Furthermore, after being separated by the support skeleton 12, the two ends of the frame body 11 respectively form a left mold cavity and a right mold cavity 121 which are independent of each other, which is equivalent to the support skeleton 12 separating the hollow mold cavity of the frame body 11 into two independent mold cavities, that is, the dry sand of the left mold cavity and the right mold cavity 121 are independent of each other, and the sand filling amount of the left mold cavity and the right mold cavity 121 is smaller than the volume of the existing hollow mold cavity, thereby reducing the volume of the mold cavity, reducing the suction resistance of the negative pressure, and facilitating the uniform suction of the left mold cavity and the right mold cavity 121. In this specific embodiment, the volume of the left mold cavity and the right mold cavity 121 is set according to the structure of the pre-prepared casting, and is not specifically limited here.

[0042] The frame body 11 is provided with an air extraction hole 111, which is used to connect to a vacuum pump to provide negative pressure for the left mold cavity and the right mold cavity 121. In this specific embodiment, an air extraction hole 111 is symmetrically provided on the left and right sides of the frame body 11, and the air extraction hole 111 is specifically a circular through hole passing through the frame body 11.

[0043] In this specific embodiment, the air extraction hole 111 is provided with a normally closed switch. In a natural state, the normally closed switch is in a closed state, the air extraction hole 111 is blocked, and the air extraction chamber 122 is separated from the outside world to prevent foreign objects such as dust from falling into the air extraction chamber 122. When the normally closed switch is in an open state, the air extraction hole 111 is connected to a vacuum pump to evacuate the air extraction chamber 122. The normally closed switch can be a manual ball valve, but is not limited thereto.

[0044] The key is that the supporting skeleton 12 has a plurality of exhaust chambers 122 connected with the exhaust holes 111, that is, the left and right ends of the exhaust chambers 122 are respectively connected with the left mold cavity and the right mold cavity 121. When a vacuum pump is used to exhaust air from the exhaust holes 111, negative pressure gas can apply negative pressure to the left mold cavity and the right mold cavity 121 from both sides of the supporting skeleton 12. The increase in the negative pressure application area is conducive to further achieving uniform exhaust, ensuring the accurate and reliable shape of the sand mold, thereby improving the casting quality.

[0045] In summary, the sand box used in the V-method vertical molding process provided by the present invention can effectively improve the casting quality and service life of the sand box 1.

[0046] In order to quickly form a sand mold, after any two adjacent sand boxes 1 are closed, the left mold cavity of one sand box 1 fits exactly with the right mold cavity 121 of the other sand box 1, thereby forming a molding mold cavity whose contour shape is consistent with the contour shape of the pre-prepared casting. The volume of a single sand mold is reduced, which is beneficial to reducing the volume and mass of the molded casting, thereby reducing the difficulty of demolding, making it easy to operate, suitable for mass production, and beneficial to improving casting efficiency.

[0047] The supporting skeleton 12 includes a plurality of longitudinal support plates 123 and transverse support plates 124, and the longitudinal support plates 123 and the transverse support plates 124 intersect vertically and horizontally to form a plurality of exhaust chambers 122. The exhaust chambers 122 are interconnected, and the volumes of all the exhaust chambers 122 are equal, which is conducive to uniform distribution of negative pressure in each exhaust chamber 122 and avoids uneven distribution of negative pressure, thereby ensuring that negative pressure is uniformly applied to the left mold cavity and the right mold cavity 121, further ensuring that the left mold cavity and the right mold cavity 121 can achieve uniform exhaust, thereby improving the quality of the sand mold, and helping to further improve the casting quality.

[0048] In this specific embodiment, the longitudinal support plates 123 and the transverse support plates 124 are staggered and vertically arranged to form a plurality of cubical exhaust chambers, and any adjacent exhaust chambers 122 are connected through air guide holes, which are circular through holes arranged on the side walls of the exhaust chambers 122. Of course, the structure and distribution of the exhaust chambers 122 are not limited thereto.

[0049] Sand baffles 125 are provided between the support frame 12 and the left mold cavity and between the support frame 12 and the right mold cavity 121. The sand baffles 125 can prevent sand from drilling into the vacuum chamber 122. However, in order to smoothly realize vacuuming, the sand baffles 125 have a number of negative pressure pores. The negative pressure pores can connect the vacuum chamber 122 with the left mold cavity, or connect the vacuum chamber 122 with the right mold cavity 121, so that the negative pressure gas can only flow from the vacuum chamber 122 into the left mold cavity or the right mold cavity 121. It should be particularly noted that the aperture of the negative pressure pores is preferably smaller than the minimum width of the sand to prevent sand from drilling into the vacuum chamber 122, while not affecting the circulation of the negative pressure gas, ensuring smooth and reliable vacuuming, low failure rate, uniform vacuuming, and naturally improved casting quality.

[0050] In order to extend the service life of the sand baffle 125, a left support plate 126 and a right support plate 127 are provided on the left and right sides of each sand baffle 125, and the sand baffle 125 is sandwiched between the left support plate 126 and the right support plate 127 to prevent the sand baffle 125 from being deformed or damaged under the action of negative pressure, and to prevent the sand baffle 125 from being impacted by sand particles, thereby further reducing the risk of the sand baffle 125 being broken. In this specific embodiment, a sand baffle 125 is provided on the left and right sides of the support frame 12, and a left support plate 126 and a right support plate 127 are provided on both sides of each sand baffle 125. The left support plate 126 is a side plate close to the exhaust chamber 122, and the right support plate 127 is a side plate close to the left mold cavity or the right mold cavity 121.

[0051] In addition, the left support plate 126 and the right support plate 127 are both provided with a plurality of vent holes 1261, which are connected to the negative pressure vent holes, so that the negative pressure gas can flow smoothly between the vacuum chamber 122 and the left mold cavity and between the vacuum chamber 122 and the right mold cavity 121. The plurality of vent holes 1261 are evenly distributed on the left support plate 126 and the right support plate 127. The inner diameter of the vent hole 1261 is slightly larger than the inner diameter of the negative pressure vent hole, so as to reduce the processing difficulty of the vent hole 1261 and reduce the production cost.

[0052] The top of the sand box 1 is provided with a plurality of left sand shooting holes 112 connected with the left mold cavity, and a plurality of right sand shooting holes 113 connected with the right mold cavity 121, to ensure that dry sand is vertically shot into the left mold cavity from the left sand shooting hole 112, and that dry sand is vertically shot into the right mold cavity 121 from the right sand shooting hole 113, so that the dry sand can fall quickly with the help of its own gravity. At the same time, the zoned sand shooting can also effectively shorten the sand shooting time, improve the sand shooting efficiency, and thus improve the casting efficiency.

[0053] Furthermore, all the left sand shooting holes 112 and all the right sand shooting holes 113 are evenly distributed along a straight line, ensuring that the dry sand falls evenly into the left mold cavity or the right mold cavity 121, improving the quality of the sand mold, thereby improving the casting quality. In this specific embodiment, the left sand shooting hole 112 and the right sand shooting hole 113 are both circular through holes passing through the frame body 11, and both are staggered along the length direction of the frame body 11. Of course, the structure and distribution of the sand shooting holes are not limited to this.

[0054] Please refer to Figures 2 to 4 , Figure 2 For application Figure 1 The mold closing state diagram of the sand box in the figure; Figure 3 For application Figure 1 The demoulding state diagram of the sand box in FIG. Figure 4 For application Figure 3 Assembly state diagram of the sand mold formed in the process.

[0055] The present invention also provides a V-method vertical molding system, comprising a positive pressure plate 2 having a left half mold, a counter pressure plate 3 having a right half mold, and the above-mentioned sand box applied to the V-method vertical molding process.

[0056] The positive pressure plate 2 and the counter pressure plate 3 are respectively located on both sides of the sand box 1, so that the positive pressure plate 2 and the counter pressure plate 3 can move closer to or farther away from each other by hydraulic power. Figure 2 As shown, the positive pressure plate 2 and the reverse pressure plate 3 are close to each other to block the left mold cavity and the right mold cavity 121, forming a closed sand filling space to provide conditions for sand filling; then, as shown in the attached Figure 3 As shown, the positive pressure plate 2 and the counter pressure plate 3 are separated from each other, the left half pattern cooperates with the left mold cavity to form a left sand mold, and the right half pattern cooperates with the right mold cavity 121 to form a right sand mold; finally, the adjacent left sand mold and the right sand mold cooperate to form a sand mold whose outer contour shape is consistent with the contour shape of the pre-prepared casting. The improvement of the casting quality of the sand box improves the yield rate of the sand mold, and the production efficiency is naturally higher.

[0057] In this specific embodiment, the left half of the pattern is specifically a cylindrical protrusion with rounded corners, and the right half of the pattern is specifically a cylindrical groove with rounded corners, which is not specifically limited here and can be set according to the pre-prepared casting.

[0058] The above is a detailed introduction to the sand box provided by the present invention for use in the V-method vertical molding process. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A sand box used in a V-method vertical molding process, characterized in that: The invention comprises at least two sand boxes (1) connected end to end, wherein any of the sand boxes (1) comprises a frame body (11) and a support frame (12) arranged on the frame body (11), and after being separated by the support frame (12), two ends of the frame body (11) respectively form a left mold cavity and a right mold cavity (121), and the support frame (12) has a plurality of exhaust chambers (122) connected to exhaust holes (111) arranged on the frame body (11) so as to exhaust the left mold cavity and the right mold cavity (121) with negative pressure; The support frame (12) comprises a plurality of longitudinal support plates (123) and transverse support plates (124) which intersect vertically and horizontally to form a plurality of the air extraction chambers (122); all the air extraction chambers (122) are interconnected and have equal volumes; A sand baffle (125) is provided between the support frame (12) and the left mold cavity and between the support frame (12) and the right mold cavity (121) for preventing sand from penetrating into the exhaust chamber (122); the sand baffle (125) has a negative pressure air hole for allowing negative pressure gas to flow only from the exhaust chamber (122) into the left mold cavity or the right mold cavity (121); A left support plate (126) and a right support plate (127) for supporting the sand baffle (125) are provided on the left and right sides of each sand baffle (125), and both the left support plate (126) and the right support plate (127) are provided with an air vent (1261) connected to the negative pressure air hole.

2. The sand box used in the V-method vertical molding process according to claim 1 is characterized in that: After any two adjacent flasks (1) are molded together, the left mold cavity of one of the flasks (1) cooperates with the right mold cavity (121) of the other flask (1) to form a molding cavity whose contour shape is consistent with the contour shape of the pre-prepared casting.

3. The flask used in the V-method vertical molding process according to any one of claims 1 to 2, characterized in that: The top of the sand box (1) is provided with a plurality of left sand shooting holes (112) and right sand shooting holes (113) which are respectively connected to the left mold cavity and the right mold cavity (121) to realize vertical sand shooting.

4. The sand box used in the V-method vertical molding process according to claim 3 is characterized in that: All of the left sand shooting holes (112) and all of the right sand shooting holes (113) are evenly distributed along a straight line.

5. The flask used in the V-method vertical molding process according to any one of claims 1 to 2, characterized in that: It also includes a sealing member which is arranged between the supporting frame (12) and the frame body (11) to seal the gap between the two.

6. The flask used in the V-method vertical molding process according to any one of claims 1 to 2, characterized in that: The air extraction hole (111) is provided with a normally closed switch.

7. A V-method vertical molding system, characterized in that: It also includes a positive pressure plate (2) with a left half mold and a counter pressure plate (3) with a right half mold, and also includes a sand box used in a V-method vertical molding process as described in any one of claims 1 to 5, wherein the left half mold cooperates with the left mold cavity to form a left sand mold, and the right half mold cooperates with the right mold cavity (121) to form a right sand mold, and the adjacent left sand mold and the right sand mold cooperate to form a sand mold whose outer contour shape is consistent with the contour shape of the pre-prepared casting.

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