Core making molds for thin-walled sand cores

Abstract

The present invention relates to a core making mold for thin-walled sand cores, comprising an upper mold and a lower mold for cooperating with the upper mold, wherein at least one block-drawing mechanism is provided in the lower mold for forming a part of the cavity surface, and at least one block-drawing mechanism comprises a front block-drawing mechanism, and the structure of the front block-drawing mechanism is as follows: comprising a front drive device, a front block and a core column; the two ends of the front block are respectively connected to the output end of the front drive device and the core column; the core column comprises a plurality of fan-shaped units distributed along the circumference, and the two ends between the outer arc surface and the inner arc surface of the fan-shaped unit are respectively connected by a connecting surface; a first exhaust gap is formed between the connecting surfaces of two adjacent fan-shaped units; the outer arc surface is used to form a part of the cavity surface, and the inner arc surface is used to enclose a central exhaust hole connected to the first exhaust gap along the circumferential direction; an exhaust duct connected to the central exhaust hole is provided in the front block. The present invention solves the problem that the current mold causes difficulty in forming sand cores.

Description

Technical Field

[0001] The invention relates to the technical field of core making moulds, in particular to a core making mould for thin-wall sand cores. Background Art

[0002] At present, the core making process of thin-walled water channel cores for small water-cooled motor casings of new energy products is a difficult point in the industry. The thin-walled water channel core here refers to the sand core used to form the water channel of the water-cooled motor casing through casting. The wall thickness of the thin-walled water channel core is only 4mm. Because the wall thickness of the thin-walled water channel core is too thin, the cavity space in the core making mold is small, which makes it very difficult to fill the coated sand. Insufficient sand filling causes incomplete molding, and the sand core scrap rate is as high as 60%. In addition, due to the casting process requirements, low-gassing gem sand (small amount of resin added, low sand core strength) must be used for core making. The strength of the water channel sand core is low. In addition, the thickness of the thin-walled water channel core is only 4mm, so the sand core is easy to break when the thin-walled water channel core is opened and ejected. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a core making mold for thin-walled sand cores, which solves the problem that the thin-walled sand cores are difficult to form when using the existing core making molds.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A core making mold for thin-walled sand cores, comprising a sand shooting plate, an ejection mechanism, an upper mold and a lower mold for cooperating with the upper mold, wherein the lower mold is provided with at least one block extraction mechanism for forming a partial cavity surface, wherein the at least one block extraction mechanism comprises a front block extraction mechanism, and the structure of the front block extraction mechanism is as follows:

[0006] It includes a front drive device, a front drawer block and a core column;

[0007] The output end of the front drive device is connected to one end of the front draw block, and the other end of the front draw block is connected to the stem;

[0008] The core column comprises a plurality of sector-shaped units, the plurality of sector-shaped units are distributed along the circumference, the sector-shaped units respectively have an outer arc surface and an inner arc surface on both sides along the radial direction thereof, and the two ends between the outer arc surface and the inner arc surface are respectively connected by a connecting surface;

[0009] A first exhaust gap is formed between the connecting surfaces of two adjacent sector-shaped units, and a plurality of the first exhaust gaps are distributed along the circumferential direction of the core column;

[0010] The outer arc surface is used to form the partial cavity surface, and the inner arc surface is used to surround a central exhaust hole connected to the first exhaust gap along the circumferential direction;

[0011] An exhaust channel is provided in the front draw block, an air inlet end of the exhaust channel is communicated with the central exhaust hole, and an air outlet end of the exhaust channel is communicated with an exhaust hole preset in the mold.

[0012] Further technical solutions are:

[0013] A lower positioning block is arranged on the front drawer block, and an upper positioning block for cooperating with the lower positioning block is arranged on the lower surface of the upper die.

[0014] The at least one block-drawing mechanism further comprises a side block-drawing mechanism, which is symmetrically arranged on both sides of the front block-drawing mechanism, and the structure of the side block-drawing mechanism on each side is:

[0015] It includes a side drive device and a side draw block;

[0016] The output end of the side driving device is connected to one end of the side draw-out block. At least one first insert is provided in the side draw-out block. The top surface of the first insert is used to form the partial cavity surface. A second exhaust gap is formed between the side surface of the first insert and the side draw-out block. The second exhaust gap is connected to the exhaust hole preset in the mold.

[0017] A mounting groove is provided on the side drawer block, which is used to install a positioning member, and the positioning member is used to position the side drawer block relative to the upper mold.

[0018] The width of the first exhaust gap and the width of the second exhaust gap are both smaller than the particle size of the core making sand.

[0019] The channel in the lower die for the front drawer block and the side drawer block to move is provided with:

[0020] An upper pressing block, which is located on the upper surface of the lower die and is used to limit the upper two sides of the draw block;

[0021] Wear-resistant blocks, which are located on the two side surfaces and the bottom surface of the channel and are used to contact the side surfaces and the bottom surface of the pumping block;

[0022] The sliding block is located on the bottom surface of the channel and is used for slidingly cooperating with the drawer block.

[0023] The ejection mechanism includes a lower ejection mechanism arranged below the lower mold, which includes a lower ejector plate that can move relative to the lower mold, and an ejector member is provided on the lower ejector plate, which includes a horizontal plate and a plurality of ejector inserts arranged on the horizontal plate, and the upper end surface of the ejector insert is used to form a partial cavity surface; a third exhaust gap is formed between the side surface of the ejector insert and the lower mold.

[0024] Two groups of sand shooting sleeves are provided in the upper mold, and the two groups of sand shooting sleeves are symmetrically arranged. The number of sand shooting sleeves in each group includes at least three, and sand shooting holes are formed inside the sand shooting sleeves; at least one second insert is provided between the two groups of sand shooting sleeves, and the inner side surface of the second insert is used to form a part of the cavity surface, and a fourth exhaust gap is formed between the second insert and the upper mold.

[0025] The sand shooting plate is provided with sand shooting nozzles corresponding to the number and positions of the sand shooting holes, a sand retaining plate is provided above the inlet of the sand shooting nozzle, and a gap is formed between the bottom surface of the sand retaining plate and the upper surface of the sand shooting nozzle.

[0026] The ejection mechanism comprises an upper ejection mechanism arranged above the upper die, which comprises an upper ejection plate that can move relative to the upper die, and an ejector pin is arranged on the upper ejector plate, and the ejector pin corresponds to the number and position of the sand shooting holes.

[0027] The beneficial effects of the present invention are as follows:

[0028] The present invention adopts a "spliced" core column, and there is a first exhaust gap between adjacent fan-shaped units (at the splicing position). The first exhaust gap is distributed along the circumferential direction, which greatly improves the exhaust capacity of the mold cavity and is beneficial to filling.

[0029] The side drawer block designed by the present invention is spliced ​​by insert blocks to form a second exhaust gap, thereby ensuring that the key position of the cavity surface can be fully exhausted.

[0030] The present invention adopts double-group sand-shooting nozzles to shoot sand, so that more coated sand can enter the mold cavity in the same time, which is beneficial to mold filling.

[0031] Based on the double-group sand-shooting nozzles, the present invention adopts insert splicing in the upper mold to form a third exhaust gap, because the sand-shooting position is not at the top of the cavity, so as to facilitate the rapid exhaust of gas from the upper part of the cavity.

[0032] The present invention adopts the ejection of the ejector piece to replace the traditional ejector pin, so the ejection area becomes larger and the core is not easy to break during ejection; at the same time, a fourth exhaust gap is formed between the ejection insert and the lower mold, which is convenient for the rapid exhaust of the gas in the lower part of the cavity.

[0033] Other features and advantages of the present invention will be set forth in the following description or may be learned by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of the mold according to an embodiment of the present invention.

[0035] Figure 2 for Figure 1 Schematic diagram of the structure after the upper mold and base are hidden.

[0036] Figure 3It is a schematic diagram of the connection structure between the front drawer block and the stem according to an embodiment of the present invention.

[0037] Figure 4 It is a schematic structural diagram of the fan-shaped unit constituting the core column according to an embodiment of the present invention.

[0038] Figure 5 It is a schematic structural diagram of a core column according to an embodiment of the present invention.

[0039] Figure 6 for Figure 5 Rear view of.

[0040] Figure 7 for Figure 6 Enlarged view of part A in the middle.

[0041] Figure 8 It is a schematic diagram of the installation structure of the upper mold according to an embodiment of the present invention.

[0042] Fig. 9 It is a schematic structural diagram of a side drawer block according to an embodiment of the present invention.

[0043] Fig.10 It is a schematic diagram of the assembly structure of the drawer block in the lower mold according to an embodiment of the present invention.

[0044] Fig.11 The figure is a schematic diagram of the assembly structure of the lower mold and the lower ejection mechanism according to an embodiment of the present invention.

[0045] Fig.12 Schematic diagram of the structure of the ejector according to an embodiment of the present invention.

[0046] Fig.13 It is a schematic structural diagram of a sandblasting plate according to an embodiment of the present invention.

[0047] Fig.14 A schematic structural diagram of an upper top plate according to an embodiment of the present invention.

[0048] Fig.15 Schematic diagram of the sand core structure prepared in an embodiment of the present invention.

[0049] In the figure: 1, upper mold frame; 2, upper mold; 3, front drive device; 4, side drive device; 5, lower mold; 6, upper top plate; 7, base; 8, front draw block; 9, lower top plate; 10, core column; 11, sand core product; 12, side draw block; 13, first insert block; 14, lower positioning block; 15, second exhaust gap; 16, upper positioning block; 17, ejector; 18, sand shooting plate; 20, upper pressure block; 21, wear-resistant block; 22, slide Block; 61, ejector pin; 81, T-slot; 82, exhaust duct; 101, fan-shaped unit; 102, first exhaust gap; 103, central exhaust hole; 131, top surface; 111, small sand column; 171, horizontal plate; 172, ejector insert; 173, upper end surface; 181, sand-shooting nozzle; 201, second insert; 202, fourth exhaust gap; 203, sand-shooting hole; 204, sand-shooting sleeve; 1011, connecting surface; 1012, inner arc surface; 1013, outer arc surface. DETAILED DESCRIPTION

[0050] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0051] like Figures 1 to 7 As shown, the core making mold for thin-walled sand cores of this embodiment includes an ejection mechanism, an upper mold 2 and a lower mold 5 for cooperating with the upper mold 2. The lower mold 5 is provided with at least one block extraction mechanism for forming a part of the cavity surface. The at least one block extraction mechanism includes a front block extraction mechanism. The structure of the front block extraction mechanism is as follows:

[0052] It includes a front drive device 3, a front drawer block 8 and a stem 10;

[0053] The output end of the front drive device 3 is connected to one end of the front drawer block 8, and the other end of the front drawer block 8 is connected to the stem 10;

[0054] The core column 10 includes a plurality of sector-shaped units 101, which are distributed along the circumference. The sector-shaped units 101 have an outer arc surface 1013 and an inner arc surface 1012 on both sides along the radial direction thereof, and the two ends between the outer arc surface 1013 and the inner arc surface 1012 are connected by a connecting surface 1011 respectively.

[0055] A first exhaust gap 102 is formed between the connecting surfaces 1011 of two adjacent sector-shaped units 101, and a plurality of the first exhaust gaps 102 are distributed along the circumference of the core column 10;

[0056] The outer arc surface 1013 is used to form the partial cavity surface, and the inner arc surface 1012 is used to surround a central exhaust hole 103 connected to the first exhaust gap 102 along the circumferential direction;

[0057] An exhaust passage 82 is provided in the front drawer block 8, the air inlet end of the exhaust passage 82 is communicated with the central exhaust hole 103, and the air outlet end of the exhaust passage 82 is communicated with the exhaust hole preset in the mold.

[0058] As a specific implementation, the front end surface of each sector unit 101 is a mounting surface, on which a connecting hole is provided, which is used to be fixedly connected to the front drawer block 8 by fasteners.

[0059] In the core-making mold for thin-walled sand cores of this embodiment, the core column 10 is used to form the sand core product 11 in the outer circle. After the forming, the core column 10 is driven by the draw block to be withdrawn, and a ring-shaped sand core product 11 can be formed. The core column 10 is a "spliced" structure. During the working process of the mold, when the coated sand is filled into the mold cavity, the gas in the mold cavity is continuously squeezed to the mold cavity surface, that is, the outer arc surface 1013 of the fan-shaped unit 101 and the rear end surface (the end surface of the other end opposite to the front end surface). It can flow in from the first exhaust gap 102 formed between two adjacent fan-shaped units 101, and then converge into the central exhaust hole 103 in the center of the core column 10, and then discharge to the exhaust hole of the lower mold 5 along the exhaust channel 82 in the front draw block 8, and finally discharge out of the mold. Thereby, the cavity exhaust is strengthened, and under the premise of the wall thickness of the sand core product 11 of 4mm, the filling difficulty of the coated sand is reduced, and the pressure generated by the poor cavity exhaust during the filling of the coated sand is prevented from hindering the flow of the coated sand.

[0060] As a specific implementation, the width of the first exhaust gap 102 is smaller than the particle size of the coated sand used for core making, specifically no larger than 4 mm, preferably 0.2 mm, so as to avoid sand particles falling into the gap and causing blockage during the exhaust process.

[0061] As a preferred embodiment, the first exhaust gaps 102 are evenly distributed along the circumferential direction, that is, the fan-shaped units have the same size and are symmetrically distributed around the central axis of the core column 10 .

[0062] As a specific embodiment, a lower positioning block 14 is provided on the front drawer block 8, and an upper positioning block 16 for cooperating with the lower positioning block 14 is provided on the lower surface of the upper mold 2. Figure 8 shown.

[0063] The upper positioning block 16 and the lower positioning block 14 can be specifically aligned up and down by means of a snap connection. When the front draw block 8 moves to a set position in the lower mold 5 under the drive of the front drive device 3, when the mold is closed, the upper positioning block 16 at the lower part of the upper mold 2 can be snapped with the lower positioning block 14 at the upper part of the front draw block 8, thereby determining that the draw block has moved into place.

[0064] like Figure 2 and Fig. 9 As shown, at least one block-drawing mechanism further includes a side block-drawing mechanism, which is symmetrically arranged on both sides of the front block-drawing mechanism, and the structure of the side block-drawing mechanism on each side is:

[0065] It includes a side drive device 4 and a side draw block 12;

[0066] The output end of the side driving device 4 is connected to one end of the side draw-out block 12. At least one first insert 13 is provided in the side draw-out block 12. The top surface 131 of the first insert 13 is used to form a partial cavity surface. A second exhaust gap 15 is formed between the side surface of the first insert 13 and the side draw-out block 12. The second exhaust gap 15 is connected to the exhaust hole preset in the mold.

[0067] The function of the second exhaust gap 15 is the same as that of the first exhaust gap 102 . The second exhaust gap 15 is further provided on the basis of the first exhaust gap 102 to ensure that sufficient exhaust can be performed at key positions of the cavity surface.

[0068] Likewise, the width of the second exhaust gap 15 is preferably smaller than the particle size of the core-making sand.

[0069] Similarly, a mounting groove is provided on the side drawer block 12 , which is also used to install the lower positioning block 14 so as to position the side drawer block 12 relative to the upper mold 2 .

[0070] Specifically, the front driving device 3 and the side driving device 4 both use cylinders.

[0071] Specifically, the front end surfaces of the front drawer block 8 and the side drawer block 12 are provided with Figure 3 The T-slot 81 shown is used for coupling with the piston rod of the cylinder.

[0072] like Fig.10 As shown, the channel for the front drawer block 8 and the side drawer block 12 to move in the lower mold 5 is provided with:

[0073] An upper pressing block 20, which is located on the upper surface of the lower mold 5 and is used to limit the upper two sides of the draw block;

[0074] Wear-resistant blocks 21, which are located on the two side surfaces and the bottom surface of the channel and are used to contact the side surfaces and the bottom surface of the pumping block;

[0075] The sliding block 22 is located at the bottom surface of the channel and is used for sliding cooperation with the drawer block.

[0076] The wear-resistant block 21 can be made of wear-resistant material to increase the service life of the block.

[0077] Specifically, the upper pressing block 20 serves to limit the upward movement of the pumping block, and the sliding block 22 serves to limit the left-right movement of the pumping block.

[0078] Specifically, the lower die 5 is formed from a whole piece of H13 steel with high dimensional accuracy, and is equipped with the above-mentioned upper pressing block 20 and wear-resistant block 21 to achieve the purpose of smooth movement of the front draw block and the side draw block.

[0079] like Figure 1 , Fig.11 and Fig.12 As shown, the ejection mechanism includes a lower ejection mechanism arranged below the lower mold 5, which includes a lower ejector plate 9 that can move relative to the lower mold 5. The lower ejector plate 9 is provided with an ejector member 17, which includes a horizontal plate 171 and a plurality of ejector inserts 172 arranged on the horizontal plate 171. The upper end surface 173 of the ejector insert 172 is used to form a partial cavity surface; a third exhaust gap is formed between the side surface of the ejector insert 172 and the lower mold 5.

[0080] The function of the third exhaust gap is the same as that of the first and second exhaust gaps. Since the ejector 17 is located at the lower part of the cavity, the third exhaust gap facilitates the rapid exhaust of gas at the lower part of the cavity.

[0081] The ejection area of ​​the sand core product is enlarged by multiple ejection inserts 172, making it less likely for the core to break during ejection.

[0082] like Figure 1 and Figure 8 As shown, two groups of sand shooting sleeves 204 are provided in the upper mold 2, and the two groups of sand shooting sleeves 204 are symmetrically arranged. The number of each group of sand shooting sleeves 204 includes at least three, and sand shooting holes 203 are formed inside the sand shooting sleeves 204; at least one second insert 201 is provided between the two groups of sand shooting sleeves 204, and the inner side surface of the second insert 201 is used to form a partial cavity surface, and a fourth exhaust gap 202 is formed between the second insert 201 and the upper mold 2.

[0083] Specifically, the upper die is formed from a whole piece of H13 steel with high dimensional accuracy. The sand shooting sleeve 204 is made of stainless steel, which has high strength and is not easy to rust, thus avoiding sand shooting wear and improving service life.

[0084] like Fig.13 As shown, the core making mold for thin-walled sand cores of this embodiment also includes a sand blasting plate 18, on which sand blasting nozzles 181 corresponding in number and position to the sand blasting holes 203 are provided, and a sand retaining plate (not shown in the figure) is provided above the inlet of the sand blasting nozzle 181, forming a gap between the bottom surface of the sand retaining plate and the upper surface of the sand blasting nozzle 181.

[0085] In this embodiment, two groups of sand shooting sleeves 204 are provided for the upper mold 2, and two groups of corresponding sand shooting nozzles 181 are also provided. When working, after the upper and lower molds are closed, the sand shooting plate is driven downward by the driving mechanism of the equipment, so that the sand shooting nozzles 181 are connected with the sand shooting holes 203 of the sand shooting sleeve 204 to perform sand shooting. The two groups of sand shooting nozzles 181 shoot sand at the same time, which can improve the sand shooting efficiency and ensure uniform filling of the mold cavity.

[0086] Those skilled in the art can understand that the sand retaining plate can be used to control the sand discharge speed, which will not be described in detail. In actual use, a sealing gasket is provided on the lower surface of the sand shooting plate to seal the connection between the sand shooting nozzle 181 and the sand shooting hole 203, which will not be described in detail.

[0087] The fourth exhaust gap 202 has the same function as the first, second and third exhaust gaps. Since the two sets of sand shooting sleeves 204 in this embodiment are arranged in two groups and are symmetrical, the sand shooting position is not the highest point of the cavity. The fourth exhaust gap 202 is located between the two sets of sand shooting sleeves 204, so that the gas in the upper part of the cavity can be quickly discharged, which is beneficial to the flow of coated sand. The fourth exhaust gap 202 is preferably 0.2 mm.

[0088] See also Fig.14 and Fig.15 The ejection mechanism also includes an upper ejection mechanism arranged above the upper mold 2, which includes an upper ejection plate 6 that can move relative to the upper mold 2, and an ejector pin 61 is provided on the upper ejector plate 6, and the ejector pin 61 corresponds to the number and position of the sand-shooting holes 203.

[0089] After the sand core is prepared, the upper and lower molds are opened. When opening the mold, the upper mold is opened first, and then the extraction block is opened. When the upper mold is opened upward, the upper top plate 6 remains stationary, and the ejector pin 61 pushes down the small sand column 111 formed in the sand shooting hole 203, so that the sand core remains in the lower mold to prevent the sand core from being torn and broken as the upper mold moves upward. Then move the upper mold, and then move the extraction block out of the lower mold, and finally eject the sand core from the lower mold through the lower ejection mechanism, so as to facilitate the removal of the sand core.

[0090] For details, see Figure 1 The upper mold 2 is arranged in the middle of the upper mold frame 1, and the lower mold 5 is arranged on the base 7. The upper mold frame 1 and the base 7 are cast by gray iron, and the frame size stability is high.

[0091] Those skilled in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A core making mold for thin-walled sand cores, comprising a sand shooting plate (18), an ejection mechanism, an upper mold (2), and a lower mold (5) for cooperating with the upper mold (2), wherein the lower mold (5) is provided with at least one block extraction mechanism for forming a partial cavity surface, characterized in that: The at least one block-drawing mechanism comprises a front block-drawing mechanism, and the structure of the front block-drawing mechanism is: It comprises a front drive device (3), a front drawer block (8) and a stem (10); The output end of the front drive device (3) is connected to one end of the front drawer block (8), and the other end of the front drawer block (8) is connected to the stem (10); The core column (10) comprises a plurality of sector-shaped units (101), the plurality of sector-shaped units (101) being distributed along the circumference, the sector-shaped units (101) respectively having an outer arc surface (1013) and an inner arc surface (1012) on both sides along the radial direction thereof, and the two ends between the outer arc surface (1013) and the inner arc surface (1012) are each connected via a connecting surface (1011); A first exhaust gap (102) is formed between the connecting surfaces (1011) of two adjacent sector-shaped units (101), and a plurality of the first exhaust gaps (102) are distributed along the circumferential direction of the core column (10); The outer arc surface (1013) is used to form the partial cavity surface, and the inner arc surface (1012) is used to surround a central exhaust hole (103) in a circumferential direction and communicate with the first exhaust gap (102); An exhaust passage (82) is provided in the front drawer block (8), an air inlet end of the exhaust passage (82) is communicated with the central exhaust hole (103), and an air outlet end of the exhaust passage (82) is communicated with an exhaust hole preset in the mold; The at least one block-drawing mechanism further comprises a side block-drawing mechanism, which is symmetrically arranged on both sides of the front block-drawing mechanism, and the structure of the side block-drawing mechanism on each side is: It comprises a side drive device (4) and a side draw block (12); The output end of the side drive device (4) is connected to one end of the side draw block (12); at least one first insert (13) is provided in the side draw block (12); the top surface (131) of the first insert (13) is used to form the partial cavity surface; a second exhaust gap (15) is formed between the side surface of the first insert (13) and the side draw block (12); the second exhaust gap (15) is connected to an exhaust hole preset in the mold; The channel in the lower mold (5) for the front drawer block (8) and the side drawer block (12) to move is provided with: An upper pressing block (20) is located on the upper surface of the lower die (5) and is used to limit the upper two sides of the draw block; Wear-resistant blocks (21), which are located on the two side surfaces and the bottom surface of the channel and are used to contact the side surfaces and the bottom surface of the pumping block; A sliding block (22), located on the bottom surface of the channel and configured to slide with the drawer; The ejection mechanism comprises a lower ejection mechanism arranged below the lower mold (5), comprising a lower ejector plate (9) movable relative to the lower mold (5), an ejector member (17) being arranged on the lower ejector plate (9), comprising a horizontal plate (171) and a plurality of ejector inserts (172) arranged on the horizontal plate (171), the upper end surface (173) of the ejector insert (172) being used to form a portion of the cavity surface; a third exhaust gap is formed between the side surface of the ejector insert (172) and the lower mold (5); Two groups of sand-shooting sleeves (204) are provided in the upper die (2), the two groups of sand-shooting sleeves (204) are symmetrically arranged, the number of each group of sand-shooting sleeves (204) includes at least three, and sand-shooting holes (203) are formed inside the sand-shooting sleeves (204); at least one second insert (201) is provided between the two groups of sand-shooting sleeves (204), the inner side surface of the second insert (201) is used to form a part of the cavity surface, and a fourth exhaust gap (202) is formed between the second insert (201) and the upper die (2).

2. The core making mold for thin-walled sand cores according to claim 1, characterized in that: A lower positioning block (14) is provided on the front drawer block (8), and an upper positioning block (16) for cooperating with the lower positioning block (14) is provided on the lower surface of the upper die (2).

3. The core making mold for thin-walled sand cores according to claim 1, characterized in that: The side drawer block (12) is provided with a mounting groove for mounting a positioning member, wherein the positioning member is used to position the side drawer block (12) relative to the upper die (2).

4. The core making mold for thin-walled sand cores according to claim 1, characterized in that: The width of the first exhaust gap (102) and the width of the second exhaust gap (15) are both smaller than the particle size of the core making sand.

5. The core making mold for thin-walled sand cores according to claim 1, characterized in that: The sand shooting plate (18) is provided with sand shooting nozzles (181) corresponding in number and position to the sand shooting holes (203), a sand retaining plate is provided above the entrance of the sand shooting nozzle (181), and a gap is formed between the bottom surface of the sand retaining plate and the upper surface of the sand shooting nozzle (181).

6. The core making mold for thin-walled sand cores according to claim 1, characterized in that: The ejection mechanism comprises an upper ejection mechanism arranged above the upper die (2), comprising an upper ejection plate (6) movable relative to the upper die (2), the upper ejection plate (6) being provided with ejector pins (61), the ejector pins (61) corresponding in number and position to the sand-shooting holes (203).

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