Mold for casting a housing and method for opening and closing the mold

Abstract

The application discloses a casting mold of a shell mold, which is characterized in that a split core on the outer periphery of a first main core is divided into an upper ring chamber combined core and a lower ring chamber combined core which are separated from each other, so that the combined core can be easily taken out from a wax mold with a small mouth and a large belly. The application can guarantee the product quality of the water meter shell, and improve the production efficiency of the wax blank and the water meter shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mold, in particular to a casting mold of a shell mold and a mold opening and closing method thereof. BACKGROUND

[0002] The existing production process of the shell mainly includes: two half type wax blank bonding assembly one forming of the investment casting and parting after forging / stamping and then welding forming.

[0003] When the two half type wax blank process is used, the shell needs to be divided into two halves to complete the wax blank and then fixed and assembled by using the adhesive. During the assembling process of the two half wax blanks, the shell is prone to deformation, misplacement and gap in the inner cavity, which may cause the shell to be not bonded in place, resulting in casting defects such as inclusion and shrinkage.

[0004] When the steel plate parting welding process is used, the shell is formed by welding each part. The product size precision error is large. The welding marks need to be polished. The welding seam is prone to porosity, slag inclusion, cracks, and the welding root cannot be welded through and welded. The crystal organization of the welding position changes, which reduces the corrosion resistance and mechanical properties of the product.

[0005] Therefore, the existing two half type wax blank process and the steel plate parting welding process cannot guarantee the quality of the shell.

[0006] At the same time, since the shell has a small mouth and a large belly structure, in order to take out the casting mold, it cannot be taken out as a whole. When the wax piece is taken out, although a short waiting is performed, the temperature of the wax liquid quickly decreases and preliminarily condenses, but the overall adhesion and the pressure formed by the high temperature are still large. The mold cannot be directly divided into two parts, and the forced division may cause the wax piece to break due to the large adhesive contact surface.

[0007] Therefore, it is necessary to provide a new casting mold of a shell mold and a method for using the same to overcome the above-mentioned defects. SUMMARY

[0008] The present application relates to the technical field of mold, in particular to a casting mold of a shell mold and a mold opening and closing method thereof.

[0009] The purpose of the present application is achieved by the following technical solution one: a casting mold (1000) of a shell mold, comprising a main mold plate (200) with a combined cavity and a combined core (100) clamped in the combined cavity, the combined cavity comprises a main core cavity (203) formed by inward extension on one side of the main mold plate (200), a water inlet cavity (204) located on one side of the main core cavity (203) and communicating with the main core cavity (203), and a water outlet cavity (205) located on the other side of the main core cavity (203) and opposite to the water inlet cavity (204), the combined core (100) comprises a main core (1) clamped in the main core cavity (203), a water inlet core (2) clamped in the water inlet cavity (204) and contacting one side of the main core (1) on one side of the main core (1), and a water outlet core (3) clamped in the water outlet cavity (205) on the other side of the main core (1), the combined core (100) comprises a combined main core shaft and a split-shaped block clamped in the combined cavity, the combined main core shaft comprises a first main core shaft (16) located in the main core cavity (203), a second main core shaft (24) located in the water inlet cavity (204), and a third main core shaft (34) located in the water outlet cavity (205), the main core (1) comprises the first main core shaft (16) located at the center position, the water inlet core (2) comprises the second main core shaft (24), and the water outlet core (3) comprises the third main core shaft (34), the split-shaped block comprises an upper ring chamber combined core (17) arranged in a circular array on the periphery of the upper part of the first main core shaft (16) and a lower ring chamber combined core (18) arranged in a circular array on the periphery of the lower part of the first main core shaft (16).

[0010] Further, the upper ring chamber combined core (17) and the lower ring chamber combined core (18) are spaced and fixedly arranged on the first main core shaft (16), and the first main core shaft (16) is provided with a spacing space at the middle position of the upper ring chamber combined core (17) and the lower ring chamber combined core (18) in the upward and downward direction.

[0011] Further, the outer periphery of the first main core shaft (16) is substantially circular, the inner periphery of the upper ring chamber combined core (17) and the inner periphery of the lower ring chamber combined core (18) are embedded with each other with the outer periphery of the first main core shaft (16), and the upper ring chamber combined core (17) and the lower ring chamber combined core (18) are matched with the first main core shaft (16) in the form of shaft hole matching.

[0012] Further, the upper ring chamber combined core (17) is composed of sliders which are embedded in each other and slide on the outer circumferential wall surface of the first main core shaft (16), and the sliders are separated from the first main core shaft in the axial direction.

[0013] Further, the first main core shaft (16) is provided with a plurality of clamping holes (161) and clamping shafts (162) which pass through the upper and lower end surfaces of the first main core shaft (16), the upper ring chamber combined core (17) is provided with a first clamping shaft (175) which cooperates with the clamping hole (161) and a first clamping hole (176) which cooperates with the clamping shaft (162) which are arranged adjacent to each other on the inner circumferential wall surface of the upper ring chamber combined core (17), and the lower ring chamber combined core (18) is provided with a second clamping shaft (185) which cooperates with the clamping hole (161) and a second clamping hole (186) which cooperates with the clamping shaft (162) which are arranged adjacent to each other on the inner circumferential wall surface of the lower ring chamber combined core (18) and correspond to the first clamping shaft (175) and the first clamping hole (176).

[0014] Further, the main core (1) includes the first main core shaft (16), the upper ring chamber combined core (17) and the lower ring chamber combined core (18), the lower ring chamber combined core (18) includes a water inlet contact portion (141) which contacts the water inlet core (2), and the upper ring chamber combined core (17) includes a water outlet contact portion (131) which contacts one side of the water outlet core (3).

[0015] Further, the water outlet contact portion (131) is integrally formed by being inclined downward from one side of the upper ring chamber combined core (17).

[0016] Further, the water inlet contact portion (141) is integrally formed by being inclined upward from one side of the lower ring chamber combined core (18), and the water inlet contact portion (141) and the water outlet contact portion (131) are arranged on opposite sides of the first main core shaft (16), respectively.

[0017] Further, the upper ring chamber combined core (17) includes a first upper petal mold (171) which is provided with the water outlet contact portion (131), a second upper petal mold (172) and a fourth upper petal mold (174) which are adjacent to both sides of the first upper petal mold (171), and a third upper petal mold (173) which is arranged opposite to the first upper petal mold (171), and the contact surfaces of the adjacent upper petal molds abut against each other.

[0018] Further, the lower ring chamber combined core (18) comprises a first lower lobe die (181) provided with the water inlet contact part (141), a second lower lobe die (182) and a sixth lower lobe die (186) located on both sides of the first lower lobe die (181), and a third lower lobe die (183), a fourth lower lobe die (184) and a fifth lower lobe die (185) arranged opposite to the first lower lobe die (181), the second lower lobe die (182) and the sixth lower lobe die (186), and the contact surfaces of adjacent lower lobe dies abut each other.

[0019] Further, the combined cavity further comprises a check port cavity (206) in communication with the main core cavity (203) between the main core cavity (203) and the water outlet cavity (205), and the combined core (100) further comprises a check port core (4) located in the check port cavity (206) and in contact with the water outlet contact part (131).

[0020] Further, the free end of the water outlet contact part (131) is further provided with a closed positioning hole (1311), and the check port core (4) is provided with a positioning shaft (4631) positioned in the positioning hole (1311).

[0021] Further, the water inlet core (2) further comprises a water inlet split core (25) which is jointly formed with the second main core shaft (24) to constitute the water inlet core (2), the water inlet split core (25) is inserted into one side of the second main core shaft (24), the water inlet split core (25) is in contact with the water inlet contact part (141), and the water inlet split core (25) is provided with a buffer step surface (254) on the side close to the water outlet core (3).

[0022] Further, the water outlet core (3) further comprises a water outlet split core (35) which is jointly formed with the third main core shaft (34) to constitute the water outlet core (3), and the water outlet split core (35) is provided with an abutting part (354) abutting against the check port core (4).

[0023] Further, the size of the part of the combined core (100) exposed outside the main body die plate (200) is greater than the size of the part of the combined core (100) located in the main body die plate (200), the cross section of the part of the combined core (100) exposed outside the main body die plate (200) is substantially circular or rectangular, and the cross section of the part of the combined core (100) exposed outside the main body die plate (200) is fitted to the end surface outside the main body die plate (200).

[0024] The purpose of the present application is achieved by the following technical solution two: a shell mold casting mold and molding method of the mold, comprising the following steps:

[0025] Assembling the first main core shaft (16) of the main core (1) and the upper ring chamber combined core (17) and the lower ring chamber combined core (18) and then loading into the main core cavity (203);

[0026] After assembling the second main core shaft (24) and the water inlet split core (25), loading into the water inlet cavity (204);

[0027] After assembling the third main core shaft (34) and the water outlet split core (35), loading into the water outlet cavity (205);

[0028] Loading the check valve core (4) into the check valve cavity (206) and inserting the positioning shaft (431) of the check valve core (4) into the positioning hole (1311) arranged in the water outlet contact part (131);

[0029] Covering the upper and lower main body templates (200') to complete the mold closing assembly of the shell mold casting mold.

[0030] The shell mold casting mold opening method comprises the following steps:

[0031] Separating the upper and lower main body templates (200);

[0032] Extracting the first main core shaft (16) of the main core (1), the second main core shaft (24) of the water inlet core (2), the third main core shaft (34) of the water outlet core (3) and the check valve core (4) from the corresponding main core cavity (203), water inlet cavity (204), water outlet cavity (205) and check valve cavity (206);

[0033] Splitting the upper ring chamber combined core (17) from the main core cavity (203), and moving the upper split core mold of the upper ring chamber combined core (17) to the intermediate position of the first main core shaft (16) during the extraction process, and then extracting the upper split core mold along the axial direction of the first main core shaft (16);

[0034] Splitting the water inlet split core (25) from the water inlet cavity (204);

[0035] Splitting the lower ring chamber combined core (18) from the main core cavity (203), and moving the lower split core mold of the lower ring chamber combined core (18) to the intermediate position of the first main core shaft (16) during the extraction process, and then extracting the lower split core mold along the axial direction of the first main core shaft (16);

[0036] The outlet water outlet split core (35) is split and removed from the outlet water outlet cavity (205).

[0037] In the shell mold casting mold of the present application, when the mold core is used to make a wax blank, the upper ring chamber combined core 17 and the lower ring chamber combined core 18 are arranged on the circumferential side of the first main core shaft 16 and arranged separately upwards and downwards, which facilitates the easy removal of the combined core from the wax mold with a small mouth and a large belly. Moreover, the shell mold casting mold can obtain a complete wax blank, and when the shell of the water meter is cast using the complete wax blank, casting defects such as deformation, misplacement, inclusion, and shrinkage are not easy to occur, at the same time, the combined core does not need to be welded, and no welds are generated, thereby ensuring the product quality of the shell of the water meter. Moreover, the shell mold casting mold can make the wax blank one-time formed, reduces the wax blank manufacturing link, improves the production efficiency of the wax blank, and further improves the production efficiency of the shell of the water meter. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a perspective view of the shell mold casting mold of the first embodiment of the present application.

[0039] Figure 2 It is a top view of the lower mold plate of the shell mold casting mold of the first embodiment of the present application.

[0040] Figure 3 It is a perspective view of the lower mold plate in the shell mold casting mold of the first embodiment of the present application.

[0041] Figure 4 It is a perspective exploded view of the casting mold in the first embodiment of the present application.

[0042] Figure 5 It is a front view of the combined core in the first embodiment of the present application.

[0043] Figure 6 It is a top view of the upper ring chamber combined core in the first embodiment of the present application.

[0044] Figure 7 It is a top view of the lower ring chamber combined core in the first embodiment of the present application.

[0045] Figure 8 It is a sectional view along the sectional plane of the upper ring chamber combined core of the shell mold casting mold.

[0046] Figure 9 It is a perspective view of the shell.

[0047] Figure 10 It is a front view of the shell.

[0048] Figure 11A perspective view of the casting mold for the housing mold in the second embodiment.

[0049] Figure 12 A perspective exploded view of the casting mold for the housing mold in the second embodiment.

[0050] Figure 13 A front view of the combined core in the second embodiment.

[0051] Figure 14 A top view of the combined core when the main core is separated from the other combined core in the second embodiment.

[0052] Figure 15 A sectional view of the combined core held in the main body template in the second embodiment.

[0053] Figure 16 A combined view and exploded view of the check port core and the core in the second embodiment.

[0054] Figure 17 An exploded view of the combined core in the second embodiment.

[0055] Figure 18 A perspective view of the lower template in the second embodiment.

[0056] Figure 19 An exploded view of the main core side block of the main core in the second embodiment.

[0057] Figure 20 A perspective view of the lower template in the casting mold for the housing mold in the second embodiment.

[0058] Figure 21 A perspective exploded view of the main core side block in the second embodiment. DETAILED DESCRIPTION

[0059] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0060] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be understood broadly, and those skilled in the art can understand the specific meanings of the above terms in the present application according to the specific circumstances.

[0061] In the industry of precision casting with melting mould, to make qualified castings, firstly, qualified moulds are needed to be made, then the wax moulds are made to make the mould shell (mould layer) for pouring to form the castings. The castings in the present application are the shell bodies. The shell bodies belong to relatively complicated castings structure products. The castings are what structure, the wax moulds are what structure to be made, in other words, the wax moulds are what shape, the castings poured out are what shape. The making method of the wax moulds is to make wax mould moulds with metal, then to shoot the melted wax into the moulds with the wax shooting machine, after cooling, the metal moulds are opened, the wax moulds can be taken out. For the castings with simple structure, the making of the wax moulds is also simple. But in most cases, the most commonly used materials for the moulds of the precision casting with melting mould are aluminium and steel, both of which are hard materials, the inside of the castings are relatively complicated, the inside of some castings need small mouth and big belly cavity, the wax moulds also need small mouth and big belly cavity, that is, the wax moulds have the problem of reverse clamping inner cavity, the whole type common core pulling cannot be directly pulled out from the wax moulds when the wax moulds are made.

[0062] Hereinafter, the specific embodiments of the casting mould of the shell mould of the present application and the mould opening and mould closing method thereof will be introduced. Please refer to Figures 1 to 21 Figures 1 to 8 shown, as the first embodiment of the present application, Figures 11 to 21 as the second embodiment of the present application.

[0063] Please refer to Figure 9 and Figure 10 ​, the water meter mold is an integrated mold, in the embodiment, the water meter mold is a wax mold made of paraffin wax, the water meter mold is designed in a 1:1 structure with the stainless steel water meter shell and has a reserved finishing allowance. The water meter shell 300 includes a water inlet channel 301, a water outlet channel 302, a middle ring cavity 303 between the water inlet channel 401 and the water outlet channel 402, a separation part 305 for separating the middle ring cavity into an upper ring cavity 3031 and a lower ring cavity 3032, and a check structure 304. The separation part 304 is used to support the installation of a water meter core. The water inlet channel 401 includes a water inlet 3011 at one end and a buffer platform 3012 opposite the water inlet 3011, and the buffer platform 3012 is used to block the high-speed water flow in the water inlet channel from impacting the water meter core. The water outlet channel 402 includes a water outlet 3021 opposite the water inlet 3011. The upper ring cavity 3031 is provided with an upper water outlet hole 30311 corresponding to the water outlet channel 302. The lower ring cavity 3032 is provided with a lower water inlet hole 30321 communicating with the upper ring cavity 3031. The check structure 405 includes a check channel 3042 communicating with the upper ring cavity 3031, a check valve cavity 3043 connected to the check channel 3042, a check port 3041 at the port of the check valve cavity 3043, a check valve 3044 inserted into the check valve cavity 3043, and a check pad 3045 at the bottom end of the check valve 3044 for preventing water from flowing into the check valve cavity 3043. When the water meter shell 300 is applied, the water flows along the following path: water inlet channel 301-lower ring cavity 3032-upper ring cavity 3031-check channel 3042 of the check structure 304-check valve cavity 3043-water outlet channel 302. The upper ring cavity 3031 and the lower ring cavity 3032 are provided with a ring-shaped separation part 305 for bearing the water meter core, and the check valve cavity 3043 is used to install the check valve 3044 for preventing water from flowing backward. At this time, due to the water flow through the lower water inlet hole 30321 and the upper water outlet hole 30311, the flow rate drives the rotation of the water meter core. When the water flows to the check structure 304, the inclined check pad 3045 is provided at the check structure 304 to prevent the backflow of water. In the first embodiment and the second embodiment, in order to smoothly pull out the core forming the upper ring chamber and the lower ring chamber, the core is divided into two parts. The difference is that in the first embodiment, the core forming the upper ring chamber 3031 and the lower ring chamber 3032 is circumferentially divided into two parts, but the upper and lower parts are integrated; and in the second embodiment, the core forming the upper ring chamber is separately provided from the core forming the lower ring chamber, and the upper ring chamber core and the lower ring chamber core are taken out at different times when the core is pulled out.

[0064] In the following, specific embodiments will be described in conjunction with Figures 1 to 21 .

[0065] Please refer toFigures 1 to 10As shown, the casting mold 1000 of the shell mold includes a main mold plate 200 with a combined cavity and a combined core 100 received and held in the combined cavity. The main mold plate 200 includes an upper mold plate 201 and a lower mold plate 202 fixedly fitted together. The upper mold plate 201 and the lower mold plate 202 are symmetrically arranged and clamped together via a fixing structure. The combined cavity is formed in the interior of the main mold plate 200 as a closed space, which includes a main core cavity 203 formed by inward extension on one side of the main mold plate 200, a water inlet cavity 204 located on one side of the main core cavity 203 and communicating with the main core cavity 203, a water outlet cavity 205 located on the other side of the main core cavity 203 and arranged opposite to the water inlet cavity 204 and communicating with the main core cavity 203, a check valve cavity 206 located between the main core cavity 203 and the water outlet cavity 205, a wax injection hole 207 located on the side of the main mold plate 200 opposite to the main core cavity 203, and a flow guide cavity 208 communicating between the wax injection hole 207 and the combined cavity. The main core cavity 203 is provided with a first opening 2031 located on the end side of the main mold plate 200, a first positioning ring portion 2032 adjacent to the first opening 2031 and having a size larger than the first opening 2031, an upper ring chamber cavity 2033 adjacent to the first positioning ring portion 2032 and having a size larger than the first opening 2031, and a lower ring chamber cavity 2034 located below the upper ring chamber cavity 2033. The main core cavity 203 further includes a check flow passage cavity 2035 arranged downwardly and obliquely from the upper ring chamber cavity 2033. The water inlet cavity 204 is provided with a second opening 2041 located on the end side of the main mold plate 200, a second positioning ring portion 2042 adjacent to the second opening 2041 and having a size larger than the second opening 2041, and a water inlet flow passage cavity 2043 located inside the second positioning ring portion 2042 and having a size larger than the second opening 2041. The water outlet cavity 205 includes a third opening 2051 located on the end side of the main mold plate 200, a third positioning ring portion 2052 adjacent to the third opening 2051 and having a size larger than the third opening 2051, and a water outlet flow passage cavity 2053 located inside the third positioning ring portion 2052 and having a size larger than the third opening 2051. The check valve cavity 206 communicates with the check flow passage cavity 2035. The check valve cavity 206 includes a fourth opening 2061 located on the end side of the main mold plate 200, a fourth positioning ring portion 2062 adjacent to the fourth opening 2061 and having a size larger than the fourth opening 2061, and a check positioning cavity 2063 located inside the fourth positioning ring portion 2062 and having a size larger than the fourth opening 2061. The check flow passage cavity 2035 is adapted to the shape of the excessive area.The check valve cavity 206 is formed extending from the check valve passage cavity 2035 to the side of the check valve cavity 206 toward the outer end side of the main mold plate 200. The check valve cavity 206 communicates with the water outlet cavity 205. In this embodiment, the check valve passage cavity 2035 communicates with the bottom end of the check valve cavity 206.

[0066] Please continue to refer to Figures 1 to 10 The combined core 100 includes a combined main core shaft and a split block held in the combined cavity. The combined main core shaft includes a first main core shaft 16 located in the main core cavity 203, a second main core shaft 24 located in the water inlet cavity 204, a third main core shaft 34 located in the water outlet cavity 205, and a check valve core 4. The split block includes an upper ring chamber combined core 17 arranged in an annular array on the upper portion of the first main core shaft 16, a lower ring chamber combined core 18 arranged in an annular array on the lower portion of the first main core shaft 16, a water inlet split core 25, and a water outlet split core 35. The combined core 100 includes a main core 1 held inserted in the main core cavity 203, a water inlet core 2 held inserted in the water inlet cavity 204 in contact with one side of the main core 1, a water outlet core 3 held inserted in the water outlet cavity 205 in contact with the other side of the main core 1, and a check valve core 4 held inserted in the check valve cavity 206 in contact with the same side of the main core 1 as the water outlet core 3.

[0067] The main core 1 includes a first operation part 11 exposed to the end side of the main body mold plate 200 and exposing the first opening 2031, a first base part 12 held by the first positioning ring part 2032, a first surrounding part 13 held by the upper ring chamber cavity 2033, a second surrounding part 14 held by the lower ring chamber cavity 2034 below the first surrounding part 13, a water outlet contact part 131 held by the check flow passage cavity 2035 extending obliquely downward from the first surrounding part 13, and a water inlet contact part 141 held by the water inlet flow passage cavity 2043 extending obliquely upward from one side of the second surrounding part 14 and facing one side of the water outlet core 3. The water inlet contact part 141 is formed extending obliquely upward from one side of the lower ring chamber combined core 18, and the water outlet contact part 131 is formed extending obliquely downward from one side of the upper ring chamber combined core 17. The water inlet contact part 141 and the water outlet contact part 131 are respectively arranged on two opposite sides of the first main core shaft 16. The free end of the water outlet contact part 131 forms a positioning hole 1311 of a closed circular ring for positioning the check core 4. The positioning hole 1311 is arranged on the side of the water outlet contact part 131 in the axial direction to form the bottom end of the check passage 3042 of the shell 300. A stepped part is formed between the first surrounding part 13 and the second surrounding part 14 to form a wax mold corresponding to the position of the partition part 305 in the shell 300. The radial dimensions of the first surrounding part 13 and the second surrounding part 14 are smaller than the upper ring chamber cavity 2033 and the lower ring chamber cavity 2034, and the remaining gaps are used to form wax molds corresponding to the upper ring cavity 3031 and the lower ring cavity 3032 during wax injection. The main core 1 further includes a first main core shaft 16 arranged at the center position and upper ring chamber combined cores 17 arranged in an annular array on the upper part of the first main core shaft 16 and lower ring chamber combined cores 18 arranged in an annular array on the lower part of the first main core shaft 16. The first main core shaft 16 is arranged with a spacing space at the middle position in the upward and downward directions of the upper ring chamber combined cores 17 and the lower ring chamber combined cores 18. The contact surfaces of the first main core shaft 16 and the upper ring chamber combined cores 17 and the lower ring chamber combined cores 18 are arc-shaped. The outer periphery of the first main core shaft 16 is substantially circular, the inner periphery of the upper ring chamber combined cores 17 and the inner periphery of the lower ring chamber combined cores 18 are embedded with the outer periphery of the first main core shaft 16, and the upper ring chamber combined cores 17 and the lower ring chamber combined cores 18 are matched with the first main core shaft 16 in a shaft hole matching manner. The upper ring chamber combined cores 17 are composed of sliders embedded with each other, the sliders slide on the outer peripheral wall surface of the first main core shaft 16, and the sliders are separated from the axial direction of the first main core shaft.The first main core shaft 16 is provided with a plurality of clamping holes 161 and clamping shafts 162 adjacent to the outer periphery of the first main core shaft 16, the upper ring chamber combined core 17 is provided with a first clamping shaft 175 and a first clamping hole 176 adjacent to the outer periphery of the upper ring chamber combined core 17, the lower ring chamber combined core 18 is provided with a second clamping shaft 185 and a second clamping hole 186 adjacent to the outer periphery of the lower ring chamber combined core 18. The upper ring chamber combined core 17 and the lower ring chamber combined core 18 are arranged at the step portion. The upper ring chamber combined core 17 includes a first upper lobe mold 171 provided with the water outlet contact portion 131, a second upper lobe mold 172 and a fourth upper lobe mold 174 adjacent to both sides of the first upper lobe mold 171, and a third upper lobe mold 173 provided opposite to the first upper lobe mold 171 and provided with the water inlet contact portion 141. The first upper lobe mold 171, the second upper lobe mold 172, the third upper lobe mold 173 and the fourth upper lobe mold 174 jointly form the upper ring chamber combined core 17 with a circular outer periphery, and the contact surfaces of adjacent upper lobe molds abut each other. When the upper ring chamber combined core 17 is pulled out, the upper lobe mold to be pulled out needs to be moved to the middle position of the first main core shaft 16 first, and then pulled out from bottom to top. The lower ring chamber combined core 18 includes a first lower lobe mold 181 provided with the water inlet contact portion 141, a second lower lobe mold 182 and a sixth lower lobe mold 186 located on both sides of the first lower lobe mold 181, and a third lower lobe mold 183, a fourth lower lobe mold 184 and a fifth lower lobe mold 185 arranged opposite to the first lower lobe mold 181, the second lower lobe mold 182 and the sixth lower lobe mold 186, and the contact surfaces of adjacent lower lobe molds abut each other. When the lower ring chamber combined core 18 is pulled out, the lower lobe mold to be pulled out needs to be moved to the middle position of the first main core shaft 16 first, and then pulled out from bottom to top. Due to the arrangement of the first ring portion 13 and the second ring portion 14, the water inlet contact portion 141 and the water outlet contact portion 131, the main core 1 has a structure with a small opening and a large belly. The main core 1 is also provided with a gas hole longitudinally penetrating the main core 1. Since the main core cavity 203 is a ring structure, after the ring structure of the combined core is completed and sealed, in the actual wax injection process, the wax with high temperature will expand and squeeze the original air, forming a vacuum at the bottom position of the main core 1. In this case, if the main core 1 is forcibly pulled out, a protrusion will be formed at the bottom of the ring chamber of the wax mold, which may cause quality problems or increase in single weight during casting, thereby causing losses.In the application, the air hole is designed in the center of the main core 1, and the air is injected by the air gun to solve the vacuum problem, which is more efficient. The increase of the air pressure at the bottom will directly lift the main core 1 by a certain distance, which is more convenient and fast when the main core 1 is extracted. At the same time, the size of the part of the combined core 100 exposed to the main mold plate 200 is larger than that of the part of the combined core located in the main mold plate 200, the cross section of the part of the combined core 100 exposed to the main mold plate 200 is substantially circular or rectangular, and the cross section of the part of the combined core 100 exposed to the main mold plate 200 is fitted to the end face outside the main mold plate 200. The radial size of the first operating part 11 of the main core 1 is larger than the size of the first opening 2031. First, it is convenient for the operator to have a recombination base surface when the core is extracted and recombined, which guarantees the work efficiency of the operator. Second, the large circular surface has a larger force area for the operator to extract the core, which can increase the work efficiency of the operator. Third, and most importantly, the accurate and fast positioning of the main core 1 is determined by whether the large circular surface and the exposed edge of the main core cavity 203 are in close contact. The annular positioning structure of the main core cavity 203 cooperates with the large circular surface of the main core 1 to achieve the positioning effect.

[0068] The water outlet contact part 131 is integrally formed with the first surrounding part 13 and is made of the same material. In this embodiment, the water outlet contact part 52 extends downward from the upper ring chamber combined core 17.

[0069] The water inlet core 2 is in contact with the main core 1 at one end of the main body mold plate 200, i.e. in contact with the water inlet contact part 141. The water inlet core 2 comprises a second operation part 21 exposed to the second opening 2041, a second base part 22 positioned in the second positioning ring part 2042, and a first combining part 23 positioned in the water inlet flow channel cavity 2043. The first combining part 23 is in contact with the water inlet contact part 141 at one side close to the main core 1. The water inlet contact part 141 and the first combining part 23 are both positioned in the water inlet flow channel cavity 2043 to form a wax mold corresponding to the water inlet passage 301 of the shell 300. The water inlet core 2 further comprises a second main core shaft 24 and a water inlet split core 25 which is composed of the second main core shaft 24. The water inlet split core 25 comprises a first water inlet split core 251 positioned in the middle of the upper surface of the second main core shaft 24, and a second water inlet split core 252 and a third water inlet split core 253 positioned on both sides of the first water inlet split core 251. Since the cross section of the water inlet split core 25 in the front-back direction is outwardly expanded on both sides, at least three water inlet split cores are provided. When the water inlet core 2 is pulled out, the second main core shaft 24 is pulled out first, then the first water inlet split core 251 in the middle of the water inlet split core 25 is pulled out, and then either of the second water inlet split core 252 and the third water inlet split core 253 on both sides of the first water inlet split core 251 is pulled out. During this process, the second water inlet split core 252 or the third water inlet split core 253 needs to be pulled out towards the position of the first water inlet split core 251 and then pulled out to the outside. The outside end of the water inlet split core 25 is inserted into the upper end of the second main core shaft 24. The front end of the second main core shaft 24 is in contact with the side of the water inlet contact part 141 facing the water inlet core 2, and the lower end surface of the water inlet split core 25 is in contact with the upper surface of the water inlet contact part 141. The side of the water inlet split core 25 facing the water outlet core 3 is formed with a buffer step surface 254 to form a wax mold corresponding to the buffer platform 3012 provided at the water inlet passage 301 of the shell 300. The buffer step surface 254 is provided so that the water inlet split core 25 cannot be pulled out together with the water inlet contact part 141 from the main core cavity 203. In this embodiment, the water inlet split core 25 cannot be pulled out together with the third lower split mold 183 provided with the water inlet contact part 141 from the wax mold.The radial dimension of the second operation part 21 is greater than the size of the second opening 2041. The function is the same as the function of the first operation part 11 of the main core 1. Firstly, it is convenient for the operator to have a reorganization base surface when the core is reorganized, which guarantees the work efficiency of the operator. Secondly, the large circular surface has a greater force area in the operation of the operator, which can increase the work efficiency of the operator. Thirdly, and most importantly, the accurate and rapid positioning of the water inlet core 2 is judged by whether the cutting surface of the second operation part 21 and the exposed edge of the water inlet core cavity 204 are in close contact. In addition, the size of the water inlet core 2 arranged in the main body template 200 is smaller than the size of the second opening 2041. The radial dimension of the second base 22 of the water inlet core 2 is equivalent to the radial dimension of the second positioning ring part 2042. The radial dimension of the first combination part 23 of the water inlet core 2 is smaller than the radial dimension of the water inlet flow channel cavity 2043. The remaining gap is filled with paraffin during the wax injection process to form part of the wax mold.

[0070] The water outlet core 3 comprises a third operating part 31 exposed to the third opening 2051, a third base part 32 extending from the third operating part 31 and located in the third positioning ring cavity 2052, and a second combining part 33 located in the water outlet channel cavity 2053. The water outlet core 3 further comprises a third main core shaft 34 and a water outlet core segment core 35 formed together with the third main core shaft 34. The water outlet core segment core 35 is inserted into the inside of the third main core shaft 34. The water outlet core segment core 35 comprises a first water outlet core segment core 351 arranged in the middle of the upper surface of the inside of the third main core shaft 34, and a second water outlet core segment core 352 and a third water outlet core segment core 353 arranged on the front and back sides of the first water outlet core segment core 351. Since the cross section of the water outlet core segment core 35 in the front and back directions is outwardly expanded on both the front and back sides, at least three water outlet core segment cores are arranged. When the water outlet core 3 is pulled out, the third main core shaft 34 is first pulled out, then the first water outlet core segment core 351 in the middle of the water outlet core segment core 35 is pulled out, and then either of the second water outlet core segment core 352 and the third water outlet core segment core 353 on the two sides of the first water outlet core segment core 351 is pulled out. In this process, the second water outlet core segment core 352 or the third water outlet core segment core 353 is pulled out to the position of the first water outlet core segment core 351 and then to the outside. The water outlet core segment core 35 is further provided with an abutting part 354 abutting against the check valve core 4. The abutting part 354 is used to form the communication position of the check valve cavity 3042 and the water outlet channel 302. The radial dimension of the third operating part 31 is greater than the dimension of the third opening 2051, and its function is the same as that of the first operating part 11 of the main core 1. Since the dimension of the second combining part 33 is greater than the dimension of the third opening 2051, a structure with a small mouth and a large belly is formed here. The radial dimension of the third base part 32 of the water outlet core 3 is equivalent to the radial dimension of the third positioning ring part 2052, and the radial dimension of the second combining part 33 of the water outlet core 3 is smaller than the radial dimension of the water outlet channel cavity 2053, and the remaining gap is filled with paraffin during the wax injection process to form part of the wax mold.

[0071] The check valve core 4 is located in one end of the main body template 200 and in contact with the main core 1, that is, in contact with the water outlet contact part 131. The check valve core 4 includes a fourth operation part 41 exposed to the fourth opening 2061 and attached to the outer surface of the check valve cavity 206, a fourth base part 42 located at the fourth positioning ring part 2062, and a third combination part 43 formed from the fourth base part 42 and held in the check valve positioning cavity 2063. The free end of the third combination part 43 extends into a positioning shaft 431 located in the positioning hole 1311 arranged in the water outlet contact part 131. The check valve positioning cavity 2063 is arranged in communication with the check valve flow passage cavity 2035. The radial dimension of the fourth operation part 41 is greater than the size of the fourth opening 2061, and its function is the same as that of the first operation part 11 of the main core 1. First, it provides a reorganization base surface for the operator during core pulling and reorganization, ensuring the work efficiency of the operator. Second, it provides a larger force area for the operator during core pulling, which can increase the work efficiency of the operator. Third, and most importantly, the accurate and rapid positioning of the check valve core 4 is determined by whether the fourth operation part 41 section and the exposed edge of the check valve cavity 206 are in close contact. The size of the fourth base part 42 is equivalent to the size of the fourth positioning ring part 2062, and the size of the third combination part 43 is smaller than the size of the check valve positioning cavity 2063. The gap left is filled with paraffin during the wax injection process to form part of the wax mold. The size of the check valve core 4 located in the main body template 200 is not greater than the size of the fourth opening 2061, and the check valve core 4 can be directly pulled out of the check valve cavity 206.

[0072] In the first embodiment of the present application, the first main core 16, the upper ring chamber combination core 17 arranged in an annular array on the upper part of the first main core 16, and the lower ring chamber combination core 18 arranged in an annular array on the lower part of the first main core 16 are arranged separately, so that the wax mold can be easily separated and pulled out from the wax mold with a small mouth and a large belly after the wax mold is cast. For workers, the work efficiency is also higher when the wax mold is formed and pulled out of the casting mold 1000 in this way.

[0073] A method for manufacturing a wax mold by a shell mold casting mold 1000 includes the following steps:

[0074] First, assemble the mold; wherein assembling the mold includes the following steps

[0075] Separate the upper mold plate 201 from the lower mold plate 202;

[0076] The first main core shaft 16, the upper ring chamber combined core 17 and the lower ring chamber combined core 18 are assembled, the assembled main core 1 is loaded into the main core cavity 203, and the tangent surface of the first operation part 11 of the main core 1 is attached to the end surface of the first opening 2031 of the main core cavity 203, so that the main core 1 is assembled to the accurate position, and the water inlet contact part 141 is located in the water inlet flow channel cavity, and the water outlet contact part 131 is located in the check flow channel cavity 2035.

[0077] After the second main core shaft 24 and the water inlet split core 25 are assembled, the assembled water inlet core 2 is loaded into the water inlet cavity 204, the first combination part 23 of the water inlet core 2 is in contact with the water inlet contact part 141, and the tangent surface of the second operation part is attached to the end surface of the second opening 2041 of the water inlet cavity 204, so that the water inlet core 2 is assembled to the accurate position; the water inlet split core 25 includes a first water inlet split core 251 arranged at the middle position of the upper surface of the second main core shaft 24, a second water inlet split core 252 and a third water inlet split core 253 arranged at the front and rear sides of the first water inlet split core 251. Since the cross section of the water inlet split core 25 in the front and rear directions is outwardly expanded at the front and rear sides, at least three water inlet split cores are arranged.

[0078] After the third main core shaft 34 of the water outlet core 3 and the water outlet split core 35 are assembled, the complete water outlet core 3 is loaded into the water outlet cavity 205, the abutting part 354 of the side of the water outlet core 3 close to the main core 1 abuts against the check core 4, until the tangent surface of the third operation part 31 is attached to the end surface of the third opening 2051 of the water outlet cavity 205, and is arranged to the accurate position; the water outlet split core 35 includes a first water outlet split core 351 arranged at the middle position of the upper surface of the inner side of the third main core shaft 34, a second water outlet split core 352 and a third water outlet split core 353 arranged at the front and rear sides of the first water outlet split core 351. Since the cross section of the water outlet split core 35 in the front and rear directions is outwardly expanded at the front and rear sides, at least three water outlet split cores are arranged.

[0079] The check core 4 is loaded into the check cavity 206, the positioning shaft 431 arranged at the free end of the check cavity 206 is positioned in the closed positioning hole 1311 arranged in the water outlet contact part 131, and the tangent surface of the fourth operation part 41 is attached to the end surface of the fourth opening 2061 of the check cavity 206, so that it is arranged to the accurate position.

[0080] Covering the upper mold plate 201 on the lower mold plate 202, and fixing the upper mold plate 201 and the lower mold plate 202 by the fixing structure; wherein the sequence of steps 2) to 5) is not limited;

[0081] Secondly, aligning the wax injection hole with the wax injection nozzle, and flowing the wax liquid into the main core cavity 203, the water inlet cavity 204, the water outlet cavity 205 and the check valve cavity 206 through the flow guide cavity 208, in the process, the general shape of the wax mold is formed;

[0082] Thirdly, delaying and pressure maintaining the wax mold to be shaped;

[0083] Fourthly, opening the mold to take out the wax mold, in the process, the following steps are included:

[0084] The air gun enters through the air hole arranged on the main core 1 to avoid deformation of the wax mold caused by bottom vacuum, and the air pressure is sufficient to automatically lift the main core 1;

[0085] Separating the main body mold plate 200 up and down;

[0086] Separating the first main core shaft 16 of the main core 1, the second main core shaft 24 of the water inlet core 2, the third main core shaft 34 of the water outlet core 3 and the check valve core 4 from the corresponding main core cavity 203, water inlet cavity 204, water outlet cavity 205 and check valve cavity 206;

[0087] Separating the upper ring chamber combined core 17 from the main core cavity 203, in the process of separation, first moving the upper half mold of the upper ring chamber combined core 17 to the intermediate position of the first main core shaft 16, and then extracting the upper half mold along the axial direction of the first main core shaft 16;

[0088] Separating the water inlet half core 25 from the water inlet cavity 204, at this time, due to the structure of the buffer table 3012 corresponding to the shell 300 arranged on the wax mold, the water inlet half core 25 cannot be extracted together with the water inlet contact part 141 which forms the water inlet channel 301 together;

[0089] Separating the lower ring chamber combined core 18 from the main core cavity 203, in the process of separation, first moving the lower half mold of the lower ring chamber combined core 18 to the intermediate position of the first main core shaft 16, and then extracting the lower half mold along the axial direction of the first main core shaft 16;

[0090] Separating the water outlet half core 35 from the water outlet cavity 205;

[0091] Putting the wax mold into the ice water tank to continue shaping, and waiting for the wax blank to completely cool and shape.

[0092] In the present application, by setting the separated first main core shaft 16, the upper ring chamber combined core 17 located at the upper part of the first main core shaft 16, and the lower ring chamber combined core 18 located at the lower part of the first main core shaft 16, at this time the upper ring chamber combined core 17 and the lower ring chamber combined core 18 are arranged separately up and down, and the water inlet contact part 141 and the water outlet contact part 131 are located on the complete first lower half mold 181 and the first upper half mold 171 which are not split, after the manufacturing of the wax mold is completed, the combined core 100 of the casting mold 1000 can be better split and pulled out from the wax mold with a small mouth and a large belly, and the efficiency is higher. The casting mold 1000 using the shell mold can obtain a complete wax mold (shell mold), and the shell is not easy to deform, misplace, mix, shrinkage, and other casting defects when the shell is cast using the complete wax mold, at the same time, the shell produced by the wax mold does not need to be split and welded, and there is no welding seam, thereby ensuring the product quality of the shell. Moreover, the casting mold 1000 of the shell mold can make the wax mold one-time forming, reduces the wax mold manufacturing link, improves the production efficiency of the wax mold, and further improves the production efficiency of the water meter shell.

[0093] Please refer to Figures 9 to 21 , the second embodiment of the present application, the shell mold casting mold 1000' includes a main mold plate 200' and a combined core 100' received and held on the main mold plate 200'. The components in the first embodiment and the second embodiment are basically the same, the difference is that in the first embodiment, the combined core in the annular array around the first main core shaft 16 is divided into an upper ring chamber combined core 17 and a lower ring chamber combined core 18 located below the upper ring chamber combined core 17, and in the first embodiment, the water inlet core 2 is also split; while in the second embodiment, the combined core in the annular array around the first main core shaft is integrated up and down, and the side edge block (1321' / 1331') below the side edge block (132' / 133' / 134') with the water outlet contact part is also provided, such design is to make the water outlet contact part 138' have the force of the side edge block when pulling out the wax mold, so that the pulling out is more smooth. The two embodiments are methods for pulling out the wax mold with a small mouth and a large belly, and the efficiency is high. The specific embodiment of the casting mold 1000' in the second embodiment is specifically described below.

[0094] The main body template 200' includes an upper template 201' and a lower template 202' which are embedded together. The upper template 201' and the lower template 202' are symmetrically arranged and clamped together via a fixing structure. The main body template 200' further includes a main core cavity 203' which is annularly arranged in the upper template 201' and the lower template 202', a water inlet cavity 204' which is located at one side of the main core cavity 203' and communicates with the main core cavity 203', a water outlet cavity 205' which is located at the other side of the main core cavity 203' and is oppositely arranged to the water inlet cavity 204' and communicates with the main core cavity 203', a core groove 2064' which is located between the water outlet cavity 205' and the main core cavity 203' and connects and transitions the main core cavity 203' and the water outlet cavity 205', a check port cavity 206 which communicates with the core groove 2064' and is located between the main core cavity 203' and the water outlet cavity 205', a wax injection hole 207' which is oppositely arranged to the main core cavity 203' and is located at one side of the main body template 200', and a flow guide cavity 208' which communicates between the wax injection hole 207' and each cavity. The main core cavity 203' is provided with a first opening 2031' which is located at the end side of the main body template 200', a first positioning ring cavity 2034' which is adjacent to the first opening 2031' and has a size larger than the first opening 2031', an upper ring chamber cavity 2032' which is adjacent to the first positioning ring cavity 2034' and has a size larger than the first opening 2031', and a lower ring chamber cavity 2033' which is adjacent to the first positioning ring cavity 2034' and has a size larger than the first opening 2031'. The water inlet cavity 204' is provided with a second opening 2041' which is located at the end side of the main body template 200', a second positioning ring cavity 2042' which is adjacent to the second opening 2041' and has a size larger than the second opening 2041', and a water inlet flow passage cavity 2043' which is located inside the second positioning ring cavity 2042' and has a size larger than the second opening 2041'. The water outlet cavity 205' includes a third opening 2051' which is located at the end side of the main body template 200', a third positioning ring cavity 2052' which is adjacent to the third opening 2051' and has a size larger than the third opening 2051', and a water outlet flow passage cavity 2053' which is located inside the third positioning ring cavity 2052' and has a size larger than the third opening 2051'. The check port cavity 206' includes a fourth opening 2061' which is located at the end side of the main body template 200', a fourth positioning ring cavity 2062' which is adjacent to the fourth opening 2061' and has a size larger than the fourth opening 2061', a check positioning cavity 2063' which is located inside the fourth positioning ring cavity 2062' and has a size larger than the fourth opening 2061', and a core groove 2064' which is located inside the check positioning cavity 2063'. The cross section of the core groove 2064' is triangular to facilitate the shape of the thickness transition area, and of course, the core groove 2064' can also be arranged in other shapes.The check port cavity 206' is formed extending from the core recess 2064' to the outer end side of the main mold plate 200'.

[0095] Please continue to refer to Figures 1 to 6 The combined core 100' includes the main core 1' held inserted in the main core cavity 203', the water inlet core 2' held inserted in the water inlet cavity 204' in contact with one side of the main core 1', the water outlet core 3' held inserted in the water outlet cavity 205' in contact with the other side of the main core 1', and the check port core 4' held inserted in the check port cavity 206' in contact with the same side of the main core 1' as the water outlet core 3', and the core 5' in the core recess 2064' in contact with the check port core 4'.

[0096] The main core 1' includes a head 11' exposed to the end side of the main body template 200' and exposing the first opening 2031, a mounting portion 16' held in the first positioning ring cavity 2034', and a first surrounding portion 14' and a second surrounding portion 15' positioned in the upper ring chamber cavity 2032' and the lower ring chamber cavity 2033'. The radial dimension of the mounting portion 16' is equivalent to that of the first positioning ring cavity 2034'. The first surrounding portion 14' is located on the upper side of the second surrounding portion 15'. The radial dimensions of the first surrounding portion 14' and the second surrounding portion 15' are smaller than those of the upper ring chamber cavity 2032' and the lower ring chamber cavity 2033', leaving a gap for filling with paraffin during the wax injection process. The first surrounding portion 14' extends downwardly to form a water outlet contact portion 138' in contact with the check valve core 4', which is in contact with the check valve core 4'. The end of the water outlet contact portion 138' is provided with a positioning hole 1381' penetrating the upper and lower surfaces thereof for inserting the check valve core 4', and a positioning notch 1382' located on the inner wall of the positioning hole 1381' close to one side of the water inlet core 3'. The second surrounding portion 15' extends upwardly to form a water inlet contact portion 139' in contact with the water inlet core 2' extending to one side of the water inlet core 2'. The main core 1' further includes a main core center insert 12' located in the middle position, and a plurality of annular arrays of upper and lower integrally arranged main core side edge inserts 13' around the main core center insert 12' to maintain the cylindrical shape of the main core 1'. Adjacent main core side edge inserts 13' abut each other, and at least one of the main core side edge inserts 13' is in contact with the check valve core 4' and the core 5'. The number of main core side edge inserts 13' is greater than 2. In this embodiment, the main core side edge insert (13') includes a peripheral insert (132' / 133' / 134') forming the water outlet contact portion (138'), and a abutting side edge insert (1321' / 1331') located below the peripheral insert abutting the lower end surface of the peripheral insert. The dimensions of the peripheral insert (132' / 133' / 134') and the abutting side edge insert (1321' / 1331') in the axial direction of the main core (1') are equivalent to those of other main core side edge inserts (13') in the axial direction of the main core (1'). In this embodiment, the main core side edge insert 13' includes a first side edge insert 131' abutting the upper template 201', a second side edge insert 132' adjacent to the first side edge insert 131' and provided with the water outlet contact portion 138', a third side frame 133' and a fourth side edge insert 134', a fifth side edge insert 135' located on the other side of the fourth side edge insert 134', and a sixth side edge insert 136' and a seventh side edge insert 137' facing the water inlet core 2'.The water inlet contact part 139' is located on at least one of the main core side blocks 13' and contacts the water inlet core 2'. The main core side block 13' forming the water inlet contact part 139' is arranged opposite to the main core side block 13' forming the water outlet contact part 138'. In this embodiment, the water inlet contact part 139' is located on the sixth side block 136' and the seventh side block 137'. The water outlet contact part 138' is located on at least one of the main core side blocks 13' and contacts the check core 4'. In this embodiment, the water outlet contact part 138' is located on the second side block 132', the third side block 133' and the fourth side block 134'. In this embodiment, the main core side block 13' further comprises the eighth side block 1321' and the ninth side block 1331' arranged below the second side block 132', the third side block 133' and the fourth side block 134' and abutting the lower surfaces of the second side block 132', the third side block 133' and the fourth side block 134'. The remaining main core side blocks 13' are integrally arranged in an up-down manner. The height (length) of the second side block 132', the third side block 133', the fourth side block 134', the eighth side block 1321' and the ninth side block 1331' abutting together is equivalent to the height (length) of the other side blocks 13' including the first side block 131'. The eighth side block 1321' and the ninth side block 1331' are arranged below the second side block 132', the third side block 133' and the fourth side block 134' provided with the water outlet contact part 138', so that when the second side block 132', the third side block 133' and the fourth side block 134' are taken out in a split manner during the opening of the casting mold 1000', the second side block 132', the third side block 133' and the fourth side block 134' have an upward supporting force and can be better demolded. In this embodiment, the side blocks are the second side block 132', the third side block 133' and the fourth side block 134'. The abutting side blocks are the eighth side block 1321' and the ninth side block 1331'. In other embodiments, the number of main core side blocks 13' is not limited. The contact surfaces of the seven side blocks of the main core side blocks 13' are parallel to each other, and adjacent side blocks abut each other. One side of the check core 4' is connected to at least one of the main core side blocks 13'. When the main core 1' is demolded, the wax mold can be damaged due to the pulling action when the core is demolded. Therefore, the plurality of main core side blocks 13' can be disassembled and taken out one by one.

[0097] Meanwhile, the part of the combined core 100' exposed to the main mold plate 200' has a size greater than that of the part of the combined core located in the main mold plate 200', the cross section of the part of the combined core 100' exposed to the main mold plate 200' is substantially circular or rectangular, and the cross section of the part of the combined core 100' exposed to the main mold plate 200' is fitted to the end surface outside the main mold plate 200'. The radial dimension of the head 11' of the main core 1' is greater than the size of the first opening 2031', which is convenient for the operator to have a recombination base surface when recombining the core, thereby ensuring the work efficiency of the operator; secondly, the large circular surface has a greater force area for the operator's core extraction action, which can increase the work efficiency of the operator; thirdly, and most importantly, the accurate and rapid positioning of the main core 1' is determined by whether the large circular surface and the exposed edge of the main core cavity 203' are in close contact. The annular positioning structure of the main core cavity 203' is cooperated with the large circular surface outside the main core mold to achieve the positioning effect.

[0098] The water inlet core 2' includes a water inlet contact part 23' in contact with the water inlet end of the main core 1', and the size of the water inlet contact part 23' is greater than that of the second opening 2041', so the water inlet core 2' is also separately arranged, that is, the water inlet core 2' includes a water inlet center insert 21' and a plurality of water inlet side edge inserts 22' arranged in an annular array around the water inlet center insert 21' so that the water inlet core 2' is arranged in a cylindrical shape. In this embodiment, there are 5 water inlet side edge inserts 22', and in other embodiments, the number of water inlet side edge inserts 22' is not limited. The water inlet core 2' further includes a first combination part 24' in contact with the water inlet contact part 139'. At least one of the water inlet side edge inserts 22' is in contact with the water inlet contact part 139'. The number of water inlet side edge inserts 22' is not less than 2. The part of the water inlet core 2' located in the second positioning ring part 2042' has a radial dimension corresponding to that of the second positioning ring part 2042', and the part of the water inlet core 2' located in the water inlet flow channel cavity 2043', that is, the radial dimension of the water inlet contact part 23' is smaller than that of the water inlet flow channel cavity 2043', and the remaining gap is filled with paraffin during the wax injection process to form part of the wax mold.

[0099] The water outlet core 3' includes a water outlet fixing part 31' exposed to the third opening 2051' and a second combining part 32' in contact with the water outlet contact part 138'. The radial dimension of the water outlet fixing part 31' is greater than the dimension of the third opening 2051', which has the same effect as the head part 11 of the main core 1. Firstly, it provides a recombination base for the operator during the core extraction and recombination, which guarantees the work efficiency of the operator. Secondly, it provides a greater force area for the operator during the core extraction, which can increase the work efficiency of the operator. Thirdly, and most importantly, the accurate and rapid positioning of the water outlet core 3' is determined by whether the cutting surface of the water outlet fixing part 31' and the exposed edge of the water outlet cavity 205' are in close contact. Since the dimension of the second combining part 32' is greater than the dimension of the third opening 2051', a structure with a small mouth and a large belly is formed here. At this time, the water outlet core 3' includes a first water outlet core 33' in contact with the check valve core 4' and a second water outlet core 34' for accommodating the water outlet contact part 138' together with the port of the first water outlet core 33'. The first water outlet core 33' further includes a contact part 331' in contact with the check valve core 4'. The contact part 331' is used to form the communication position of the check valve cavity 4052 and the water outlet passage 402 when forming the shell mold. The part of the water outlet core 3' located in the third positioning ring part 2052' has a radial dimension corresponding to that of the third positioning ring part 2052'. The part of the water outlet core 3' located in the water outlet flow passage cavity 2053' has a radial dimension smaller than that of the water outlet flow passage cavity 2053'. The remaining gap is filled with paraffin during the wax injection process to form part of the wax mold.

[0100] The check valve core 4' includes a check valve fixing part 41' exposed to the fourth opening 2061' and attached to the outer surface of the check valve cavity 206' and a third combining part 42' in contact with the water outlet contact part 138'. The radial dimension of the check valve fixing part 41' is greater than the dimension of the fourth opening 2061', which has the same effect as the head part 11' of the main core 1'. The part of the check valve core 4' located inside the main mold plate 200' has a dimension smaller than that of the fourth opening 2061'. The part of the check valve core 4' located in the third base cavity 2062' has a radial dimension corresponding to that of the third base cavity 2062'. The part of the check valve core 4' located in the check positioning cavity 2063' has a radial dimension smaller than that of the check positioning cavity 2063'. The remaining gap is filled with paraffin during the wax injection process to form part of the wax mold. The check valve core 4' further includes a clamping part for clamping the core 5'.

[0101] The core 5' is made of metal and is located in the core groove 2064'. The cross-sectional width of the core 5' perpendicular to the axial direction of the check valve cavity 206' is adapted to the radial width of the check valve core 4'. The core groove 2064' is located below the check valve cavity 206' at the area where the main core cavity 203' and the water outlet cavity 205' are connected. The core 5' occupies this position and forms a cavity during the process of forming a wax mold, so that the wall thickness at the cavity of the wax mold is uniform, the quality is light, and the weight reduction effect is achieved. The core 5' is a two-piece structure, including a second split core 52' facing the water outlet core 3' on one side of the check valve core 4' and a first split core 51' combined with the second split core 52' to form the core 5'. The second split core 52' protrudes a positioning protrusion 521' to one side of the water outlet core 3' and has an annular portion with a radial dimension adapted to the end of the check valve core 4' and a wedge-shaped pressing surface 53' pressed on one side of the main mold plate 200'. The bottom end of the core 5' at the pressing surface 53' is to form an occupation and further form a weight reduction portion 407 during the process of forming a shell mold. The positioning protrusion 521' is engaged with the positioning notch 1382' provided on the water outlet contact portion 138' of the main core 1'. The annular portion is engaged with the retaining portion. That is, the core 5' passes through the positioning hole 1381' and the positioning protrusion 521' is engaged with the positioning notch 1382', and the annular portion is engaged with the retaining portion. The positioning protrusion 521' is formed to form the bottom of the check flow channel 4051 during the process of forming a shell mold. The core 5' is embedded in the mold and plays an occupation role during the wax injection process. After the wax mold is solidified, the core 5' is split and taken out through the check valve, and the wax mold cavity is formed to ensure that the weight reduction and uniform wall thickness are achieved. The wedge-shaped pressing surface 53' of the core 5' increases the channel area and water flow volume at the anti-backflow inlet, thereby improving the overall measurement accuracy of the water meter.

[0102] In the second embodiment of the present application, the main core side block 13' of the main core center block 12' is integrally formed in an up-down structure, and in the demolding process, the combined core 100' can be split and taken out when the mold opening is large.

[0103] A method for manufacturing a wax mold by a shell mold casting mold 1000', comprising the following steps:

[0104] Firstly, assembling the mold, wherein assembling the mold comprises the following steps

[0105] 1) Separate the upper mold plate 201' from the lower mold plate 202';

[0106] 2) After assembling the main core center insert 12' and the main core side insert 13' of the main core 1', the main core 1' is put into the main core cavity 203', and the tangent plane of the head 11' of the main core 1' is fitted to the end face of the first opening 2031' of the main core cavity 203', so that the main core 1' is arranged to the accurate position;

[0107] 3) The first split core 51' and the second split core 52' are put into the check valve core 4', and are fixed to the check valve core 4' through the interaction of the annular part and the clamping part. The check valve core 4' is put into the check valve cavity 206', and the core 5' is put into the core groove 2064'. At the same time, the core 5' is clamped in the positioning hole 1381' of the main core 1', until the positioning protrusion 521' is clamped into the positioning notch 1382'. The check valve core 4' is put into the check valve cavity 206', and the tangent plane of the check valve fixing part 41' of the check valve core 4' is fitted to the end face of the fourth opening 2061' of the check valve cavity 206', so that the check valve core 4' is arranged to the accurate position;

[0108] 4) The water outlet core 3' is put into the water outlet cavity 205'. In this process, the first water outlet core 33' and the second water outlet core 34' are assembled and then put into the water outlet cavity 205'. When the abutting part 331' abuts on one side of the check valve core 4', until the tangent plane of the water outlet fixing part 31' is fitted to the end face of the third opening 2051' of the water outlet cavity 205', the water outlet core 3' is arranged to the accurate position;

[0109] 5) After assembling the water inlet center insert 21' and the water inlet side insert 22' of the water inlet core 2', the water inlet core 2' is put into the water inlet cavity 204'. The tangent plane of the water inlet fixing part 21' of the water inlet core 2' is fitted to the end face of the second opening 2041' of the water inlet cavity 204'. One side of the water inlet core 2' in the water inlet cavity 204' abuts on the water inlet contact part 139', and the water inlet core 2' is arranged to the accurate position;

[0110] 6) The upper mold plate 201' is covered on the lower mold plate 202', and the upper mold plate 201' and the lower mold plate 202' are fixed by the fixing structure. The sequence of steps 2) to 5) is not limited;

[0111] Second step, align the mold wax injection hole with the wax injection nozzle, and let the wax liquid flow into the main core cavity 203', the water inlet cavity 204', the water outlet cavity 205' and the check valve cavity 206' through the flow guide cavity 208' through the wax injection hole;

[0112] Third step, delay pressure setting of the wax mold;

[0113] Fourth step, open the mold to take wax, in the process includes the following steps:

[0114] 1) air gun by in the main core 1' around the jet into, avoid the bottom of the vacuum caused by the wax deformation, local top main core 1';

[0115] 2) the main core 1' split upwards, first pull out the main core center insert 12', then pull out the main core side insert 13' in multiple times;

[0116] 3) first pull out the check valve core 4', pull out at the same time with the core 5', first pull out the first split core 51', then use tweezers or other tools to pull out the second split core 52' with the positioning block 521';

[0117] 4) split out the water outlet core 3', first pull out the second water outlet core 34', then pull out the first water outlet core 33' with the resistance part 331';

[0118] 5) split out the water inlet core 2', first pull out the water inlet center insert 21', then pull out the water inlet side insert 22', wherein the order of steps 1) to 5) is not limited.

[0119] In the present application, the annular array is integrally arranged on the main core side insert 13' above and below the main core middle insert 12', when the main core 1' needs to be pulled out, the main core middle insert 12' is first pulled out, and then the main core side insert 13' is split and pulled out, which can well pull out the combined core 100' from the wax mold with a small outlet and a large belly.

[0120] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

[0121] The above is only some of the embodiments of the present application, not all the embodiments, any equivalent changes made by the person skilled in the art to the technical solutions of the present application by reading the specification of the present application are covered by the claims of the present application.

Claims

1. A casting mold (1000) of a shell mold, comprising a main mold plate (200) having a combined cavity and a combined core (100) held in the combined cavity, the combined cavity comprising a main core cavity (203) formed by inward extension on one side of the main mold plate (200), a water inlet cavity (204) located on one side of the main core cavity (203) and communicating with the main core cavity (203), and a water outlet cavity (205) located on the other side of the main core cavity (203) and opposite to the water inlet cavity (204), the main core cavity (203) being provided with a first opening (2031) located on the end side of the main mold plate (200), and a first positioning ring part (2032) located close to the first opening (2031) and having a size larger than the first opening (2031), the combined core (100) comprising a main core (1) held in the main core cavity (203), a water inlet core (2) held in the water inlet cavity (204) and contacting one side of the main core (1) on one side of the main core (1), and a water outlet core (3) held in the water outlet cavity (205) on the other side of the main core (1), characterized in that: The combined core (100) comprises a combined main core shaft and a split block held in the combined cavity, the combined main core shaft comprises a first main core shaft (16) located in the main core cavity (203), a second main core shaft (24) located in the water inlet cavity (204), and a third main core shaft (34) located in the water outlet cavity (205), the main core (1) comprises the first main core shaft (16) located at the center position, the water inlet core (2) comprises the second main core shaft (24), and the water outlet core (3) comprises the third main core shaft (34), the split block comprises an upper ring chamber combined core (17) arranged in an annular array on the periphery of the upper part of the first main core shaft (16) and a lower ring chamber combined core (18) arranged in an annular array on the periphery of the lower part of the first main core shaft (16), the upper ring chamber combined core (17) and the lower ring chamber combined core (18) are spaced and fixedly arranged on the first main core shaft (16), the first main core shaft (16) is provided with a spacing space at the middle position in the upward and downward direction of the upper ring chamber combined core (17) and the lower ring chamber combined core (18), the outer periphery of the first main core shaft (16) is substantially circular, the inner periphery of the upper ring chamber combined core (17) and the inner periphery of the lower ring chamber combined core (18) are mutually embedded with the outer periphery of the first main core shaft (16), the upper ring chamber combined core (17) and the lower ring chamber combined core (18) are matched with the first main core shaft (16) in the form of shaft hole matching, the upper ring chamber combined core (17) is composed of sliders mutually embedded, the sliders slide on the outer peripheral wall surface of the first main core shaft (16), the sliders are separated from the first main core shaft (16) in the axial direction, a plurality of clamping holes (161) and clamping shafts (162) penetrating the upper and lower end faces of the outer periphery of the first main core shaft (16) are arranged adjacent to the outer periphery of the first main core shaft (16), the first clamping shafts (175) matched with the clamping holes (161) and the first clamping holes (176) matched with the clamping shafts (162) are arranged adjacent to the inner periphery of the upper ring chamber combined core (17), the second clamping shafts (185) corresponding to the first clamping shafts (175) and matched with the clamping holes (161) and the second clamping holes (186) corresponding to the first clamping holes (176) and matched with the clamping shafts (162) are arranged adjacent to the inner periphery of the lower ring chamber combined core (18).

2. The casting mold for a case mold according to claim 1, characterized by: The main core (1) comprises the first main core shaft (16), the upper ring chamber combined core (17), and the lower ring chamber combined core (18), the lower ring chamber combined core (18) comprises a water inlet contact portion (141) in contact with the water inlet core (2), and the upper ring chamber combined core (17) comprises a water outlet contact portion (131) in contact with one side of the water outlet core (3).

3. The casting mold for a shell mold as recited in claim 2, characterized by: The water outlet contact portion (131) is integrally extended downward from one side of the upper ring chamber combined core (17).

4. The casting mold for a shell mold as recited in claim 3, characterized by: The water inlet contact part (141) is integrally extended upward from one side of the lower ring chamber combined core (18), and the water inlet contact part (141) and the water outlet contact part (131) are arranged on two opposite sides of the first main core shaft (16) respectively.

5. The casting mold for a shell mold as recited in claim 4, characterized by: The upper ring chamber combined core (17) comprises a first upper lobe mold (171) provided with the water outlet contact part (131), a second upper lobe mold (172) and a fourth upper lobe mold (174) adjacent to two sides of the first upper lobe mold (171), and a third upper lobe mold (173) arranged opposite to the first upper lobe mold (171), and the contact surfaces of adjacent upper lobe molds abut against each other.

6. The casting mold for a shell mold as recited in claim 5, characterized by: The lower ring chamber combined core (18) comprises a first lower lobe mold (181) provided with the water inlet contact part (141), a second lower lobe mold (182) and a sixth lower lobe mold (186) located on two sides of the first lower lobe mold (181), and a third lower lobe mold (183), a fourth lower lobe mold (184) and a fifth lower lobe mold (185) arranged opposite to the first lower lobe mold (181), the second lower lobe mold (182) and the sixth lower lobe mold (186), and the contact surfaces of adjacent lower lobe molds abut against each other.

7. The casting mold for a shell mold as recited in claim 5, characterized by: The combined core (100) further comprises a check port core (4) located in the check port cavity (206) and in contact with the water outlet contact part (131).

8. The casting mold for a shell mold as recited in claim 7, characterized by: The free end of the water outlet contact part (131) is further provided with a closed positioning hole (1311), and the check port core (4) is provided with a positioning shaft (431) positioned in the positioning hole (1311).

9. The casting mold for a shell mold as recited in claim 8, characterized by: The water inlet core (2) further comprises a water inlet split core (25) which is composed of the second main core shaft (24) and constitutes the water inlet core (2) together, the water inlet split core (25) is inserted into one side of the second main core shaft (24), the water inlet split core (25) is in contact with the water inlet contact part (141), and the water inlet split core (25) is provided with a buffer step surface (254) on the side close to the water outlet core (3).

10. The casting mold for a shell mold as recited in claim 9, characterized by: The water outlet core (3) further comprises a water outlet split core (35) which is composed of the third main core shaft (34) and constitutes the water outlet core (3) together, and the water outlet split core (35) is provided with an abutting part (354) abutting against the check port core (4).

11. The casting mold for a shell mold as recited in claim 10, characterized by: The size of the part of the combined core (100) exposed outside the main body mold plate (200) is greater than the size of the part of the combined core (100) located inside the main body mold plate (200), the cross section of the part of the combined core (100) exposed outside the main body mold plate (200) is substantially circular or rectangular, and the cross section of the part of the combined core (100) exposed outside the main body mold plate (200) is fitted to the end surface outside the main body mold plate (200).

12. A mold closing method of a casting mold of a shell mold as defined in claim 11, characterized by: The method comprises the following steps: Assemble the first main core shaft (16) of the main core (1) and the upper ring chamber combined core (17) and the lower ring chamber combined core (18) and then put them into the main core cavity (203); After assembling the second main core shaft (24) and the water inlet split core (25), put them into the water inlet cavity (204); After assembling the third main core shaft (34) and the water outlet split core (35), put them into the water outlet cavity (205); Put the check valve core (4) into the check valve cavity (206) and insert the positioning shaft (431) of the check valve core (4) into the positioning hole (1311) provided in the water outlet contact part (131); Close the upper and lower main body templates (200) to complete the assembly of the casting mold of the shell mold.

13. A mold opening method of a casting mold of a shell mold as set forth in claim 11, characterized by: The method comprises the following steps: Separate the upper and lower main body templates (200); Remove the first main core shaft (16) of the main core (1), the second main core shaft (24) of the water inlet core (2), the third main core shaft (34) of the water outlet core (3) and the check valve core (4) from the main core cavity (203), the water inlet cavity (204), the water outlet cavity (205) and the check valve cavity (206) respectively; Split the upper ring chamber combined core (17) from the main core cavity (203) and move the upper split mold of the upper ring chamber combined core (17) to the intermediate position of the first main core shaft (16) and then pull out the upper split mold along the axial direction of the first main core shaft (16); Split the water inlet split core (25) from the water inlet cavity (204); Split the lower ring chamber combined core (18) from the main core cavity (203) and move the lower split mold of the lower ring chamber combined core (18) to the intermediate position of the first main core shaft (16) and then pull out the lower split mold along the axial direction of the first main core shaft (16); Split the water outlet split core (35) from the water outlet cavity (205).

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