A multi-cavity complex casting wax part forming mold and forming method thereof

Abstract

The present invention relates to the technical field of investment casting, and specifically to a multi-cavity complex casting wax molding die and a molding method thereof, wherein core No. 1 is fixed to core No. 1 positioning block on a base, core No. 2 is fixed to core No. 2 positioning bushing, core No. 2 positioning bushing is fixed to a support of the base, core No. 3 is pre-fixed to core No. 3 positioning mold cover by screws, and the core No. 3 positioning mold cover with core No. 3 is placed as a whole into the upper cover assembly of the mold, the upper groove metal block is placed on the middle block of the outer ring sliding block, the lower groove metal block is placed on the lower groove metal block support block, the upper cover side locking block of the upper cover assembly is moved downward to cooperate with the outer surface of the outer ring sliding block assembly, the upper cover is closed and locked to close the mold; wax injection is completed through the wax injection port; the mold is opened in the reverse direction according to the mold closing sequence, the wax piece is taken out, the wax piece is immersed in a solvent, and the core is removed. The present invention can improve the pressing efficiency and overall dimensional accuracy of the wax piece.

Description

Technical Field

[0001] The invention relates to the technical field of investment precision casting, and in particular to a wax molding die for a multi-cavity complex casting and a molding method thereof. Background Art

[0002] In the existing technology, the bearing seat is large in size and has a multi-layer annular thin-walled multi-cavity structure. The casting cavity is a semi-closed structure. The commonly used casting process can form a cavity structure in two ways. One is to use a ceramic core to press the wax part, and use alkali to de-core after the casting to form an inner cavity. The second is to press the split wax parts for splicing. Both methods can be applied to the process of semi-closed cavity castings. However, the bearing seat casting has a large cavity space size and a thick ceramic core size, which makes sintering difficult. In addition, the core positioning, pouring shrinkage, and post-processing de-coring are difficult to predict. The wax parts splicing molding has poor dimensional consistency and low efficiency. Both processes have process risks. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a multi-cavity complex casting wax molding mold and a molding method thereof; the specific technical solutions are as follows:

[0004] A multi-cavity complex casting wax molding die, comprising a first upper cover layer, a second upper cover layer, an open middle tapered block, a side locking block of the upper cover, a No. 1 core positioning block, a No. 1 core, a No. 2 core, a No. 2 core positioning bushing, a No. 3 core, a No. 3 core positioning die cover, an outer ring sliding drawer upper block, an outer ring sliding drawer middle block, an outer ring sliding drawer bottom block, an outer ring drawer positioning block, an upper groove metal movable block, a lower groove metal movable block, a lower groove metal movable block support block, a base, a guide tenon of the outer ring sliding drawer bottom block, and an outer ring drawer die opening auxiliary device;

[0005] A cylindrical support is provided at the center of the base, and a placement groove is provided at the upper end of the support; a deep positioning groove is provided on the base along the circumferential direction of the support for mounting the No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pull-out block positioning block, and the lower groove metal movable block support block; the shape of the deep positioning groove corresponds to the No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pull-out block positioning block, and the lower groove metal movable block support block;

[0006] The No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pulling block positioning block and the lower groove metal movable block support block are all inserted into the corresponding positioning deep grooves, and the No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pulling block positioning block and the lower groove metal movable block support block are respectively locked on the base by hexagon socket screws;

[0007] The lower end surface of the upper cover layer is provided with a deep positioning groove for installing the upper cover layer 2 and the upper cover side locking block; the upper cover layer 2 is square and has a slot in the center. The upper cover layer 2 is arranged in the deep positioning groove in the center of the upper cover layer 1 and is connected by a hexagon socket screw; the open middle conical block is arranged in the slot of the upper cover layer 2, and the open middle conical block is connected to the upper cover layer 2 by a hexagon socket screw; two upper cover side locking blocks are provided on each side of the four side walls of the upper cover layer 2, and are symmetrically arranged and inserted into the deep positioning groove of the upper cover layer. The upper cover layer 1, the upper cover layer 2, the open middle conical block and the upper cover side locking blocks form an upper cover assembly;

[0008] The outer ring sliding block upper block is arranged on the outer ring sliding block middle block, and the outer ring sliding block middle block is arranged on the outer ring sliding block bottom block, and the three are fixed to form an outer ring sliding block assembly with an integrated structure, and the outer ring sliding block middle block is provided with an outer ring sliding block upper block guide tenon, and the outer ring sliding block upper block slides in and out along the outer ring sliding block upper block guide tenon;

[0009] The lower groove metal movable block support block is arranged on the base along the circumferential direction of the support, and the lower groove metal movable block is arranged on the upper end surface of the lower groove metal movable block support block;

[0010] The upper groove metal movable block is arranged on the middle block of the outer ring sliding block;

[0011] There are four outer ring drawer block positioning blocks, and the outer ring sliding drawer block bottom block slides inward and outward along the four outer ring drawer block positioning blocks toward the center of the support through the guide tenons of the outer ring sliding drawer block bottom block;

[0012] The upper end of the outer ring drawer block positioning block is provided with a positioning column for cooperating with the circular holes provided at the four corners of the upper cover layer;

[0013] The No. 1 core is placed on the base outside the support and cooperates with the No. 1 core positioning block;

[0014] The No. 2 core positioning bushing is arranged on the support, and the No. 2 core is sleeved on the No. 2 core positioning bushing;

[0015] The No. 3 core is fixed to the No. 3 core positioning mold cover by means of hexagon socket screws, and the No. 3 core positioning mold cover is arranged in the open middle conical block;

[0016] The outer ring drawer block mold opening auxiliary device is connected to the left outer ring sliding drawer block assembly block, and is used to realize the mold opening and closing movement;

[0017] After mold closing, the inner cavity surface of the mold forms a multi-layer annular thin-wall multi-cavity structure;

[0018] A wax injection nozzle matched with the upper cover layer is arranged on the upper end surface of the upper block of the outer ring sliding block on the left side, and the wax injection nozzle is connected to a channel for injecting wax into the mold.

[0019] The preferred embodiment of the multi-cavity complex casting wax molding die is as follows: the outer surface of the outer ring sliding block assembly after the outer ring sliding block upper block, the outer ring sliding block middle block and the outer ring sliding block bottom block are superimposed is wedge-shaped;

[0020] A long groove is provided on the base outside the outer ring sliding block assembly to cooperate with the locking block on the upper cover side;

[0021] The upper cover side locking block is wedge-shaped to match the wedge angle of the outer ring sliding block assembly; when locking the upper cover side locking block, it fits with the outer surface of the outer ring sliding block assembly, and the locked upper cover side locking block is inserted into the long groove.

[0022] The preferred embodiment of the multi-cavity complex casting wax molding die is as follows: core No. 1, core No. 2, and core No. 3 are all water-soluble cores;

[0023] Positioning bushings are placed in cores No. 1 and No. 3 during the core manufacturing process, and the bushings are partially wrapped inside when the cores are pressed.

[0024] A method for forming a wax mold for a multi-cavity complex casting comprises the following steps:

[0025] Step 1: When pressing the water-soluble core, place the bushing into the corresponding core No. 1 and core No. 3 molds to prepare core No. 1, core No. 2, and core No. 3 including the bushing;

[0026] Step 2: Assemble the mold. First, fix core No. 1 to the core positioning block No. 1 on the base, then install core No. 2, fix core No. 2 in the core positioning bushing No. 2, fix the core positioning bushing No. 2 on the support of the base, and finally install core No. 3. Pre-fix core No. 3 in the core positioning mold cover No. 3 by screws, and put the core positioning mold cover No. 3 with core No. 3 into the upper cover assembly of the mold as a whole, place the upper groove metal block on the middle block of the outer ring sliding block, and place the lower groove metal block on the lower groove metal block support block, move the upper cover side locking block of the upper cover assembly downward to cooperate with the outer surface of the outer ring sliding block assembly, cover the upper cover assembly and lock the mold;

[0027] Step 3: Inject wax into the mold through the wax injection port, adjust the flow rate, temperature and holding time parameters of the wax injection equipment to complete the wax injection;

[0028] Step 4: Open the mold in reverse according to the mold closing order, take out the wax part with three cores, and immerse the entire wax part in the solvent, remove the core, and take out the bushings of core No. 1 and core No. 3 for recycling.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects:

[0030] The technical solution of the present invention sets deep grooves in the upper cover layer and the base to limit the movement of each component, effectively increasing the positioning accuracy and reducing the slight deviation caused by tightening the screws, which can ensure the movement of the outer ring pull-out block positioning block and the center deviation with the No. 1 core positioning block, and finally ensure the overall roundness and uniform thickness of the wax part. There are three water-soluble cores, and two of the cores are placed in positioning bushings during the core manufacturing process. When the core is pressed, the bushings are partially wrapped, and the two are combined to form an integral core. The bushings and the mold are positioned to solve the problems of suspended positioning of the cavity core, reducing the dimensional deviation of large-sized cores that lead to positioning misalignment in the mold, and core breakage during pressing, thereby improving the core positioning accuracy;

[0031] The sliding block of the mold outer ring is heavy and difficult to move manually. The lever-assisted mold opener effectively reduces manual labor.

[0032] The present invention adopts a water-soluble core with auxiliary positioning metal and a positioning bushing, and accurately positions the bushing in the wax part mold. After pressing, the water-soluble core is removed with a dissolving liquid to obtain a multi-cavity complex bearing seat wax part, which can not only ensure production efficiency but also ensure the overall roughness and size of the wax part surface.

[0033] The present invention improves the pressing efficiency and overall dimensional accuracy of wax parts, simplifies the complex multi-cavity casting molding process scheme, has a stable process scheme, improves the production efficiency and dimensional accuracy of the wax parts, increases the pass rate, saves costs, and has high economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A three-dimensional diagram of a wax mold for a complex multi-cavity casting;

[0035] Figure 2 This is a schematic diagram of the mold opening structure of a wax mold for a multi-cavity complex casting;

[0036] Figure 3 This is a schematic diagram of the mold closing structure of a wax mold for a multi-cavity complex casting;

[0037] Figure 4 Schematic diagram of the structure of core No. 1 including the bushing;

[0038] Figure 5 for Figure 4 Side view of

[0039] Figure 6 This is a schematic diagram of the No. 2 core structure;

[0040] Figure 7 for Figure 6 Side view of

[0041] Figure 8 This is a schematic diagram of the structure of core No. 3 including the bushing;

[0042] Figure 9 for Figure 7 Side view of

[0043] Figure 10 This is a schematic diagram of the wax part structure with a core after pressing;

[0044] Figure 11 Schematic diagram of the wax part structure after core removal.

[0045] In the figure, 1-1 is the first layer of the upper cover; 1-2 is the second layer of the upper cover; 1-3 is the open middle conical block; 1-4 is the side locking block of the upper cover; 2 is the positioning block of core No. 1; 3 is core No. 1; 4 is core No. 2; 5 is the positioning bushing of core No. 2; 6 is core No. 3; 7 is the positioning mold cover of core No. 3; 8-1 is the upper block of the outer ring sliding drawer block; 8-2 is the middle block of the outer ring sliding drawer block; 8-3 is the bottom block of the outer ring sliding drawer block; 9 is the positioning block of the outer ring drawer block; 10 is the upper groove metal movable block; 11 is the lower groove metal movable block; 12 is the lower groove metal movable block support block; 13 is the base; 14 is the outer ring drawer block mold opening auxiliary device. DETAILED DESCRIPTION

[0046] The following combination Figures 1-11 The present invention is described in detail, but the protection scope of the present invention is not limited by the accompanying drawings.

[0047] A multi-cavity complex casting wax molding mold, comprising an upper cover layer 1-1, an upper cover second layer 1-2, an open middle tapered block 1-3, an upper cover side locking block 1-4, a No. 1 core positioning block 2, a No. 1 core 3, a No. 2 core 4, a No. 2 core positioning bushing 5, a No. 3 core 6, a No. 3 core positioning mold cover 7, an outer ring sliding drawer upper block 8-1, an outer ring sliding drawer middle block 8-2, an outer ring sliding drawer bottom block 8-3, an outer ring drawer positioning block 9, an upper groove metal movable block 10, a lower groove metal movable block 11, a lower groove metal movable block support block 12, a base 13, a guide tenon of the outer ring sliding drawer bottom block 8-3, and an outer ring drawer mold opening auxiliary device 14;

[0048] A cylindrical support is provided at the center of the base 13, and a placement groove is provided at the upper end of the support. A deep positioning groove is provided on the base along the circumferential direction of the support for mounting the No. 1 core positioning block 2, the guide tenon of the outer ring sliding block bottom block 8-3, the outer ring pull-out block positioning block 9, and the lower groove metal movable block support block 12; the shape of the deep positioning groove corresponds to the No. 1 core positioning block 2, the guide tenon of the outer ring sliding block bottom block 8-3, the outer ring pull-out block positioning block 9, and the lower groove metal movable block support block 12;

[0049] The core positioning block No. 1 2, the guide tenon of the outer ring sliding block bottom block 8-3, the outer ring pulling block positioning block 9 and the lower groove metal movable block support block 12 are all inserted into the corresponding deep positioning grooves, and the core positioning block No. 1 2, the guide tenon of the outer ring sliding block bottom block 8-3, the outer ring pulling block positioning block 9 and the lower groove metal movable block support block 12 are locked on the base 13 by hexagon socket screws;

[0050] The lower end surface of the upper cover layer 1-1 is provided with a positioning deep groove for installing the upper cover second layer 1-2 and the upper cover side locking block 1-4; the upper cover second layer 1-2 is square, with a card slot in the center, and the upper cover second layer 1-2 is arranged in the positioning deep groove of the upper cover layer and is connected by hexagon socket screws; the open middle conical block 1-3 is arranged in the card slot on the lower end surface of the upper cover second layer 1-2, and the open middle conical block 1-3 is connected to the upper cover second layer 1-2 by hexagon socket screws; two upper cover side locking blocks 1-4 are provided on each side of the four side walls of the upper cover second layer 1-2, and are symmetrically arranged and inserted into the positioning deep groove of the upper cover layer 1-1, and the upper cover layer 1-3, the upper cover second layer 1-2 and the upper cover side locking blocks 1-4 are fixed to form a shaped upper cover assembly;

[0051] The outer ring sliding block upper block 8-1 is arranged on the outer ring sliding block middle block 8-2, and the outer ring sliding block middle block 8-2 is arranged on the outer ring sliding block bottom block 8-3. The three are fixed to form an outer ring sliding block assembly with an integrated structure, and the outer ring sliding block middle block 8-2 is provided with an outer ring sliding block upper block guide tenon, and the outer ring sliding block upper block 8-1 slides in and out along the outer ring sliding block upper block guide tenon;

[0052] The lower groove metal movable block support block 12 is arranged on the base along the circumferential direction of the support, and the lower groove metal movable block 11 is arranged on the upper end surface of the lower groove metal movable block support block 12;

[0053] The upper groove metal movable block 10 is arranged on the outer ring sliding block middle block 8-2;

[0054] There are four outer ring pull-out block positioning blocks 9, and the outer ring sliding pull-out block bottom block 8-3 slides inward and outward along the four outer ring pull-out block positioning blocks 9 toward the center of the support through the guide tenon of the outer ring sliding pull-out block bottom block;

[0055] The upper end of the outer ring pull-out block positioning block 9 is provided with a positioning column for cooperating with the circular holes provided at the four corners of the upper cover layer 1-1;

[0056] The No. 1 core 3 is placed on the base outside the support and cooperates with the No. 1 core positioning block 2;

[0057] The No. 2 core positioning bushing 5 is arranged on the support, and the No. 2 core 4 is sleeved on the No. 2 core positioning bushing 5;

[0058] The No. 3 core 6 is fixed to the No. 3 core positioning mold cover 7 by means of hexagon socket screws, and the No. 3 core positioning mold cover 7 is arranged in the open middle conical block 1-3;

[0059] The outer ring pull-out block mold opening auxiliary device 14 is connected to the left outer ring sliding pull-out block assembly block, and is used to realize the mold opening and closing movement;

[0060] After mold closing, the inner cavity surface of the mold forms a multi-layer annular thin-wall multi-cavity structure;

[0061] A wax injection nozzle matched with the upper cover layer 1-1 is provided on the upper end surface of the upper block 8-1 of the outer ring sliding block on the left side, and the wax injection nozzle is connected to a channel for injecting wax into the mold.

[0062] The outer surface of the outer ring sliding block assembly after the outer ring sliding block upper block 8-1, the outer ring sliding block middle block 8-2 and the outer ring sliding block bottom block 8-3 are superimposed is wedge-shaped;

[0063] The base 13 on the outside of the outer ring sliding block assembly is provided with a long groove that cooperates with the locking blocks 1-4 on the upper cover side;

[0064] The upper cover side locking block 1-4 is wedge-shaped, which is used to match the wedge angle of the outer ring sliding block assembly; when locking the upper cover side locking block 1-4, it fits with the outer surface of the outer ring sliding block assembly, and the locked upper cover side locking block 1-4 is inserted into the long groove set in the base 13 for positioning and locking.

[0065] Core 3 No. 1, core 4 No. 2 and core 6 No. 3 are all water-soluble cores;

[0066] Positioning bushings are placed in the No. 1 core 3 and the No. 3 core 6 during the core manufacturing process, and the bushings are partially wrapped inside when the core is pressed.

[0067] A method for forming a wax mold for a multi-cavity complex casting comprises the following steps:

[0068] Step 1: When pressing the water-soluble core, place the bushing into the corresponding No. 1 core 3 and No. 3 core 6 molds to prepare No. 1 core 3, No. 2 core 4 and No. 3 core 6 including the bushing;

[0069] Step 2: Assemble the mold. First, fix the No. 1 core 3 to the No. 1 core positioning block 2 on the base 13, then install the No. 2 core 4, fix the No. 2 core 4 in the No. 2 core positioning bushing 5, and fix the No. 2 core positioning bushing 5 on the support of the base 13. Finally, install the No. 3 core 6, and pre-fix the No. 3 core in the No. 3 core positioning mold cover 7 by screws, and put the No. 3 core positioning mold cover 7 with the No. 3 core 6 into the upper cover assembly of the mold as a whole, place the upper groove metal block 10 on the outer ring sliding block middle block 8-2, and place the lower groove metal block 11 on the lower groove metal block support block 12, move the upper cover side locking block 1-4 of the upper cover assembly downward to cooperate with the outer surface of the outer ring sliding block assembly, cover the upper cover assembly and lock the mold;

[0070] Step 3: Inject wax into the mold through the wax injection port, adjust the flow rate, temperature and holding time parameters of the wax injection equipment to complete the wax injection;

[0071] Step 4: Open the mold in reverse according to the mold closing order, take out the wax part with three cores, and immerse the wax part as a whole in the solvent, remove the core, and take out the bushings of core 1 3 and core 3 6 for recycling.

Claims

1. A wax molding die for complex multi-cavity castings, characterized by: It includes a first layer of upper cover, a second layer of upper cover, an open middle conical block, a side locking block of the upper cover, a No. 1 core positioning block, a No. 1 core, a No. 2 core, a No. 2 core positioning bushing, a No. 3 core, a No. 3 core positioning mold cover, an outer ring sliding drawer block upper block, an outer ring sliding drawer block middle block, an outer ring sliding drawer block bottom block, an outer ring drawer block positioning block, an upper groove metal movable block, a lower groove metal movable block, a lower groove metal movable block support block, a base, a guide tenon of the outer ring sliding drawer block bottom block, and an outer ring drawer block mold opening auxiliary device; A cylindrical support is provided at the center of the base, and a placement groove is provided at the upper end of the support; a deep positioning groove is provided on the base along the circumferential direction of the support for mounting the No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pull-out block positioning block, and the lower groove metal movable block support block; the shape of the deep positioning groove corresponds to the No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pull-out block positioning block, and the lower groove metal movable block support block; The No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pulling block positioning block and the lower groove metal movable block support block are all inserted into the corresponding positioning deep grooves, and the No. 1 core positioning block, the guide tenon of the outer ring sliding block bottom block, the outer ring pulling block positioning block and the lower groove metal movable block support block are respectively locked on the base by hexagon socket screws; The lower end surface of the upper cover layer is provided with a deep positioning groove for installing the upper cover layer 2 and the upper cover side locking block; the upper cover layer 2 is square and has a slot in the center. The upper cover layer 2 is arranged in the deep positioning groove in the center of the upper cover layer 1 and is connected by a hexagon socket screw; the open middle conical block is arranged in the slot of the upper cover layer 2, and the open middle conical block is connected to the upper cover layer 2 by a hexagon socket screw; two upper cover side locking blocks are provided on each side of the four side walls of the upper cover layer 2, and are symmetrically arranged and inserted into the deep positioning groove of the upper cover layer. The upper cover layer 1, the upper cover layer 2, the open middle conical block and the upper cover side locking blocks form an upper cover assembly; The outer ring sliding block upper block is arranged on the outer ring sliding block middle block, and the outer ring sliding block middle block is arranged on the outer ring sliding block bottom block, and the three are fixed to form an outer ring sliding block assembly with an integrated structure, and the outer ring sliding block middle block is provided with an outer ring sliding block upper block guide tenon, and the outer ring sliding block upper block slides in and out along the outer ring sliding block upper block guide tenon; The lower groove metal movable block support block is arranged on the base along the circumferential direction of the support, and the lower groove metal movable block is arranged on the upper end surface of the lower groove metal movable block support block; The upper groove metal movable block is arranged on the middle block of the outer ring sliding block; There are four outer ring drawer block positioning blocks, and the outer ring sliding drawer block bottom block slides inward and outward along the four outer ring drawer block positioning blocks toward the center of the support through the guide tenons of the outer ring sliding drawer block bottom block; The upper end of the outer ring drawer block positioning block is provided with a positioning column for cooperating with the circular holes provided at the four corners of the upper cover layer; The No. 1 core is placed on the base outside the support and cooperates with the No. 1 core positioning block; The No. 2 core positioning bushing is arranged on the support, and the No. 2 core is sleeved on the No. 2 core positioning bushing; The No. 3 core is fixed to the No. 3 core positioning mold cover by means of hexagon socket screws, and the No. 3 core positioning mold cover is arranged in the open middle conical block; The outer ring drawer block mold opening auxiliary device is connected to the left outer ring sliding drawer block assembly block, and is used to realize the mold opening and closing movement; After mold closing, the inner cavity surface of the mold forms a multi-layer annular thin-wall multi-cavity structure; A wax injection nozzle matched with the upper cover layer is arranged on the upper end surface of the upper block of the outer ring sliding block on the left side, and the wax injection nozzle is connected to a channel for injecting wax into the mold.

2. A wax molding die for complex multi-cavity castings according to claim 1, characterized in that: The outer surface of the outer ring sliding block assembly after the outer ring sliding block upper block, the outer ring sliding block middle block and the outer ring sliding block bottom block are superimposed is wedge-shaped; A long groove is provided on the base outside the outer ring sliding block assembly to cooperate with the locking block on the upper cover side; The upper cover side locking block is wedge-shaped to match the wedge angle of the outer ring sliding block assembly; when locking the upper cover side locking block, it fits with the outer surface of the outer ring sliding block assembly, and the locked upper cover side locking block is inserted into the long groove.

3. The multi-cavity complex casting wax molding die according to claim 1, characterized in that: Cores No. 1, 2, and 3 are all water-soluble cores; Positioning bushings are placed in cores No. 1 and No. 3 during the core manufacturing process, and the bushings are partially wrapped inside when the cores are pressed.

4. The method for forming a wax mold for a multi-cavity complex casting according to claim 3, characterized in that: The steps include: Step 1: When pressing the water-soluble core, place the bushing into the corresponding core No. 1 and core No. 3 molds to prepare core No. 1, core No. 2, and core No. 3 including the bushing; Step 2: Assemble the mold. First, fix core No. 1 to the core positioning block No. 1 on the base, then install core No. 2, fix core No. 2 in the core positioning bushing No. 2, fix the core positioning bushing No. 2 on the support of the base, and finally install core No.

3. Pre-fix core No. 3 in the core positioning mold cover No. 3 by screws, and put the core positioning mold cover No. 3 with core No. 3 into the upper cover assembly of the mold as a whole, place the upper groove metal block on the middle block of the outer ring sliding block, and place the lower groove metal block on the lower groove metal block support block, move the upper cover side locking block of the upper cover assembly downward to cooperate with the outer surface of the outer ring sliding block assembly, cover the upper cover assembly and lock the mold; Step 3: Inject wax into the mold through the wax injection port, adjust the flow rate, temperature and holding time parameters of the wax injection equipment to complete the wax injection; Step 4: Open the mold in reverse according to the mold closing order, take out the wax part with three cores, and immerse the entire wax part in the solvent, remove the core, and take out the bushings of core No. 1 and core No. 3 for recycling.

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