An assembly method of a mechanical hand tray and a wax mold group in a casket investment casting process

Abstract

The present application relates to the technical field of aero-engine casing investment casting, and particularly relates to an assembly method of a mechanical hand tray and a wax mold group in a casing investment casting process. A positioning template is used as a template of the mechanical hand tray. Before a bolt with a wax rod is installed on the wax mold group, a positioning hole matched with a bolt hole of the mechanical hand tray on the positioning template is used to determine the installation position of the wax rod on the wax mold group. After the wax rod and the bolt are installed, the positioning template is used to check the bolt position on the installed wax rod. After the position is determined to be accurate, the wax mold group is connected with the mechanical hand tray. The positioning template is used to calibrate the connecting bolt position, and the complicated operation of repeatedly measuring the connecting bolt position of the wax mold group and the size of the tray positioning hole by using a measuring tool is omitted. The connecting efficiency of the mechanical hand shell wax mold group of a large and complex casing can be improved, and the problem that the mold group is difficult to connect or the connection position is deviated due to inaccurate measurement and inaccurate positioning can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine casing investment casting, in particular to an assembly method of a mechanical hand tray and a wax mold group in a casing investment casting process. BACKGROUND

[0002] The casing casting of an aero-engine or a combustion engine is large in size and complex in structure, and the wax mold group for pouring is also more complex. The wax mold group is heavy, and when a mechanical hand is used for shell making, it must be connected with the mechanical hand at multiple points. Therefore, the bolts embedded in the wax mold group and the bolt holes of the mechanical hand tray must be precisely positioned before connection, so that all the connecting bolts can be inserted into the tray bolt holes and fastened, thereby making the casing wax mold group and the mechanical hand have good connection strength and can withstand the gravity, torsion, centrifugal force and the like during shell making. The conventional method is to first measure the positions of the bolt holes on the mechanical hand tray, and then measure the positions of the corresponding connecting bolts on the wax mold group, mark and perform one by one.

[0003] Since the mechanical hand tray is heavy, the mounting holes of the mechanical hand tray cannot be directly compared with the bolt positions of the wax mold group, and only measuring tools can be used to repeatedly check between the mechanical hand tray and the wax mold group. Since the large and complex casing wax mold group needs to be connected with many bolts, there will be deviations during measurement and installation of the bolts, and the whole process becomes very complex, time-consuming and laborious. In addition, it is also possible that one or several positions are offset and cannot be connected. Alternatively, the bolt holes of the mechanical hand tray are made very large, which greatly reduces the connection strength, causes the wax mold group to crack when the slurry is adhered, and causes the casting to have inclusion defects due to cracks drilled into the slurry. SUMMARY

[0004] The purpose of the present application is to conveniently, quickly and accurately position the preset positions of the connecting bolts of the large and complex casing wax mold group and the mechanical hand tray, and after installation is completed, to conveniently, quickly and accurately check the connection with the tray, to ensure the connection strength of the large and complex casing wax mold group and the mechanical hand tray, and to improve the production efficiency of the large and complex casing mechanical hand shell making and avoid the risk of mold group cracking during shell making.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: an assembly method of a mechanical hand tray and a wax mold group in a casing investment casting process, comprising the following contents:

[0006] Step one: a positioning template matched with the mechanical hand tray is made, the positioning template is provided with a plurality of positioning holes and a center positioning hole, the center of the positioning hole and the number of the holes are consistent with the bolt holes on the mechanical hand tray, the center of the center positioning hole is consistent with the center column bolt hole on the mechanical hand tray, and the diameter of the positioning hole is greater than the diameter of the wax rod, and the diameter of the center positioning hole is greater than the diameter of the center column runner;

[0007] Step two: mark the position of each wax rod on the plane where the wax mold group is to be installed by using the positioning holes of the positioning template, and then install the wax rod with bolt into position;

[0008] The step two specifically comprises: firstly, fix the positioning template on the plane where the wax mold group is to be installed by corresponding the center positioning hole on the positioning template with the middle column sprue on the wax mold group;

[0009] Mark the position of the wax rod to be installed on the plane where the wax mold group is to be installed along the inner edge of each positioning hole of the positioning template;

[0010] Then, take off the positioning template placed on the wax mold group, and vertically bond the wax rod with bolt at the marked position of the wax mold group;

[0011] Step three: install the positioning sheet on the positioning hole of the positioning template, and check the position accuracy of the bolt by using the bolt positioning hole located at the center of each positioning sheet;

[0012] The step three specifically comprises: firstly, bond the sprue cup wax mold with the middle column sprue by passing the middle column bolt, and the height of the sprue cup wax mold is the same as that of the wax rod after bonding;

[0013] Then, install the positioning sheet on each positioning hole and the center positioning hole of the positioning template, and each positioning sheet is provided with a plurality of grooves along its edge, and the positioning sheet is fixed on the positioning template by using a plurality of positioning columns engaged with the grooves;

[0014] The center of each positioning sheet is a bolt positioning hole matched with the size of the bolt, and the diameter of the bolt positioning hole is smaller than that of the corresponding bolt hole on the mechanical hand tray;

[0015] After that, place the positioning template with positioning sheet on the top surface of the sprue cup wax mold and the plurality of wax rods, and check whether the bolt of each wax rod can smoothly pass through the bolt positioning hole of each positioning sheet on the positioning template by taking the middle column bolt on the wax mold group as a reference, and if the bolt cannot enter the corresponding bolt positioning hole, the corresponding wax rod needs to be taken off and reinstalled according to the position of the bolt positioning hole;

[0016] Step four: after the position accuracy of the bolt is qualified, disassemble the positioning template, and connect the mechanical hand tray with the wax mold group;

[0017] Preferably, the material of the positioning template is acrylic plate.

[0018] The method can directly calibrate the connecting bolt position with the positioning plate, and the complicated operation of repeatedly measuring the connecting bolt position of the wax mold group and the size of the tray positioning hole with measuring tools is omitted, the shell-making wax mold group connecting efficiency of the large and complex cartridge mechanical hand is improved by more than 3 times, and the positioning inaccuracy caused by inaccurate measurement is avoided, so that the mold group connection is difficult or the connection position is deviated, the mold group falls from the mechanical hand or cracks when the mold group is stuck with slurry during the mold group coating process, and the mold group is scrapped or cracks drill into the slurry to cause the inclusion defects of the castings. The economic loss of complex large mold group production is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the mechanical hand tray from the top;

[0020] Figure 2 It is a structural schematic view of the mechanical hand tray from the top; Figure 1 It is a structural schematic view of the mechanical hand tray from the top;

[0021] Figure 3 It is a structural schematic view of the mechanical hand tray from the top;

[0022] Figure 4 It is a structural schematic view of the mechanical hand tray from the top;

[0023] Figure 5 It is a structural schematic view of the mechanical hand tray from the top; Figure 4 It is a structural schematic view of the mechanical hand tray from the top;

[0024] Figure 6 It is a structural schematic view of the mechanical hand tray from the top;

[0025] Figure 7 It is a structural schematic view of the mechanical hand tray from the top;

[0026] Figure 8 It is a structural schematic view of the mechanical hand tray from the top;

[0027] Figure 9 It is a structural schematic view of the mechanical hand tray from the top;

[0028] Figure 10 It is a structural schematic view of the mechanical hand tray from the top;

[0029] In the figure: 1, positioning template; 2, middle layer positioning hole; 3, center positioning hole; 4, inner and outer layer positioning hole; 5, positioning column; 6, mechanical hand tray; 7, middle layer bolt hole; 8, middle column bolt hole; 9, inner and outer layer bolt hole; 10, inner and outer layer positioning piece; 11, inner and outer layer bolt positioning hole; 12, middle layer positioning piece; 13, middle layer bolt positioning hole; 14, center hole positioning piece; 15, middle column bolt positioning hole; 16, bolt; 17, wax rod; 18, middle column bolt; 19, sprue cup wax mold; 20, middle column sprue; 21, wax mold group. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work shall fall within the scope of protection of the present invention.

[0031] Take the manipulator tray 6 and wax mold 21 of a certain engine turbine rear casing casting as an example. Figures 1-2 As shown, in this embodiment, the diameter of the manipulator tray 6 is 1350 mm, and the bolt holes inside it include: a plurality of middle layer bolt holes 7 with a hole diameter of 28 mm and a plurality of inner and outer layer bolt holes 9 with a hole diameter of 22 mm, a total of 24 bolt holes, and a center column bolt hole 8 with a hole diameter of 32 mm located in the center of the manipulator tray 6;

[0032] like Figure 3 As shown, a corresponding number of bolts 16 and a center column bolt 18 located in the center column runner 20 of the wax mold 21 need to be provided on the wax mold 21, wherein part of the outer wall of the bolt 16 is wrapped in the wax rod 17;

[0033] Finally, the wax mold 21 is connected and fixed to the robot tray 6 by connecting multiple bolts 16 corresponding to the middle layer bolt holes 7, the inner and outer layer bolt holes 9 on the robot tray 6, and the center column bolts 18 and the center column bolt holes 8.

[0034] In this embodiment, the diameter of the wax rod 17 is 45 mm, the diameter of the bolt 16 is 18 mm, the diameter of the center column runner 20 is 90 mm, and the diameter of the center column bolt 18 is 30 mm.

[0035] The present invention uses a positioning template 1 as a template for the manipulator tray 6. Before the bolt 16 with the wax rod 17 is installed on the wax mold group 21, the positioning holes on the positioning template 1 that match the bolt holes on the manipulator tray 6 are first used to determine the installation position of the wax rod 17 on the wax mold group 21. After the wax rod 17 and the bolt 16 are installed, the positioning template 1 is used to check the position of the bolt 16 on the installed wax rod 17. After confirming that the position is accurate, the wax mold group 21 is connected to the manipulator tray 6. The wax mold group 21 of a large and complex casing is conveniently, quickly and accurately connected to the manipulator tray 6, which specifically includes the following steps:

[0036] Step 1: Make a positioning template 1 that matches the robot tray 6, such as Figures 4-5As shown, the positioning template 1 is provided with multiple positioning holes and a center positioning hole 3. The center and number of the positioning holes are consistent with the bolt holes on the manipulator tray 6. The center of the center positioning hole 3 is consistent with the center column bolt hole 8, and the diameter of the positioning hole is larger than the diameter of the wax rod 17. The diameter of the center positioning hole 3 is larger than the diameter of the center column runner 20.

[0037] The positioning holes on the positioning template 1 include: middle layer positioning holes 2 that are concentric with the middle layer bolt holes 7 and are the same in number, and inner and outer layer positioning holes 4 that are concentric with the inner and outer layer bolt holes 9 and are the same in number;

[0038] Specifically, in this embodiment, the diameter of the positioning template 1 is the same as that of the manipulator tray 6, which is 1350 mm. The thickness of the positioning template 1 can be selected according to the diameter. The principle of selection is to have a certain rigidity without being too heavy, and to facilitate operation under the premise of ensuring the positioning flatness of the positioning template 1. Here, the thickness is selected to be 8 mm;

[0039] The positioning template 1 is preferably made of acrylic sheet material, taking advantage of its transparency, light weight, and certain rigidity. Because the middle layer positioning holes 2 and the inner and outer layer positioning holes 4 on the positioning template 1 are needed to determine the position of the wax rod 17 on the wax mold 21, and the wax rod 17 has a certain degree of vertical deviation during installation, the diameters of the middle layer positioning holes 2 and the inner and outer layer positioning holes 4 are larger than the diameter of the wax rod 17.

[0040] In addition, during the installation of the wax rods 17, the positions of the wax rods 17 can be corrected using the middle layer positioning holes 2 and the inner and outer layer positioning holes 4 on the positioning template 1. A certain gap is required when the middle layer positioning holes 2 and the inner and outer layer positioning holes 4 fall along the plurality of wax rods 17, but the gap should not be too large, otherwise the position of the bolts 16 cannot be accurately guaranteed.

[0041] Since in the connection design between the wax mold 21 and the manipulator tray 6, the inner and outer layer bolt holes 9 play a major connecting role, and the middle layer bolt holes 7 play an auxiliary role, the diameters of the inner and outer layer positioning holes 4 on the positioning template 1 are as close as possible to the diameter of the wax rod 17, while the diameter of the middle layer positioning hole 2 can be slightly larger. Therefore, in this embodiment, the diameters of the inner and outer layer positioning holes 4 on the positioning template 1 are 47 mm, the diameter of the middle layer positioning hole 2 is 50 mm, and the diameter of the center hole 3 is 92 mm.

[0042] Step 2: Use the positioning template 1 to mark the position of each wax rod 17 on the plane where the wax mold assembly 21 is to be installed, and install the wax rod 17 with the bolt 16 in place;

[0043] Specifically, such as Figure 3 As shown, first, the center positioning hole 3 on the positioning template 1 corresponds to the center column runner 20 on the wax mold 21, and the positioning template 1 is fixed on the plane where the wax mold 21 is to be installed;

[0044] Since the positioning template 1 is the template of the mechanical hand tray 6, and the diameter of the positioning hole on the positioning template 1 is larger than the diameter of the wax rod 17, the positions where the wax rods 17 need to be installed can be drawn on the plane of the wax mold group 21 along the inner edge of each positioning hole on the positioning template 1 by using a colored pen or other markable means.

[0045] Then, the positioning template 1 placed on the wax mold group 21 is removed, and the wax rod 17 with the bolt 16 is vertically bonded to the mark drawn on the wax mold group 21.

[0046] Since the number of the wax rods 17 is large, and each wax rod 17 has a certain height, any deviation in the verticality of each wax rod 17 during installation will accumulate to cause the overall deviation to increase, so the positioning template 1 can be used to correct the overall height position during the installation of the wax rod 17 to ensure the overall accuracy of the installation of the plurality of wax rods 17.

[0047] Step three: inspect the position accuracy of the bolt 16, specifically as follows:

[0048] As shown in Figure 10 , first, the sprue cup wax mold 19 is passed through the column bolt 18 and bonded with the column sprue 20, and the height of the sprue cup wax mold 19 is the same as that of the wax rod 17.

[0049] Then, the positioning pieces are installed on the plurality of positioning holes and the center positioning hole 3 of the positioning template 1, including the inner-outer layer positioning piece 10 installed on the inner-outer layer positioning hole 4, the middle layer positioning piece 12 installed on the middle layer positioning hole 2, and the center hole positioning piece 14 installed on the center positioning hole 3, as shown in Figure 4 and Figure 6 , each positioning piece is provided with a plurality of grooves along the edge thereof, and the positioning piece is fixed on the positioning template 1 by using the positioning column 5 engaged with the grooves.

[0050] The center of each positioning piece is a bolt positioning hole matched with the size of the bolt 16, and the diameter of the bolt positioning hole is smaller than the diameter of the corresponding bolt hole on the mechanical hand tray 6, as shown in Figures 7-10 , the bolt positioning hole includes the inner-outer layer bolt positioning hole 11 located at the center of the inner-outer layer positioning piece 10, the middle layer bolt positioning hole 13 located at the center of the middle layer positioning piece 12, and the column bolt positioning hole 15 located at the center of the center hole positioning piece 14.

[0051] In the embodiment, the diameter of the inner-outer layer bolt positioning hole 11 is 20 mm, the diameter of the middle layer bolt positioning hole 13 is 25 mm, and the diameter of the column bolt positioning hole 15 is 31 mm.

[0052] Afterwards, the positioning template 1 with the positioning sheet is laid on the top surface of the sprue cup wax mold 19 and the plurality of wax rods 17, and the stud 16 of each wax rod 17 is checked for whether it can pass through the stud positioning hole of each positioning sheet on the positioning template 1 smoothly, taking the stud 18 as a reference. If the stud 16 cannot enter the corresponding stud positioning hole during the process, the corresponding wax rod 17 needs to be removed and reinstalled according to the position of the stud positioning hole.

[0053] Step four: after the position accuracy of the stud 16 is qualified, the positioning template 1 is removed, and the mechanical hand tray 6 is connected with the wax mold group 21.

[0054] Specifically, since the positioning hole of the positioning template 1 is consistent with the stud hole on the mechanical hand tray 6, and the diameter of the stud positioning hole of the positioning template 1 is smaller than the diameter of the corresponding stud hole on the mechanical hand tray 6, the stud 16 that has been corrected by the positioning template 1 can be easily put into the corresponding stud hole on the mechanical hand tray 6, and then the corresponding nut is provided, so that the connection between the mechanical hand tray 6 and the wax mold group 21 is completed.

Claims

1. A method for assembling a robot tray and a wax mold group in a mold casting process, characterized in that, The application relates to a positioning template matched with a mechanical hand tray. Step one: a positioning template matched with a mechanical hand tray is prepared, the positioning template is provided with a plurality of positioning holes and a center positioning hole, the center of the positioning holes and the number of the positioning holes are consistent with bolt holes on the mechanical hand tray, the center of the center positioning hole is consistent with a middle column bolt hole on the mechanical hand tray, the diameter of the positioning holes is larger than the diameter of a wax rod to be fixed on a wax mold group, and the diameter of the center positioning hole is larger than the diameter of a middle column runner on the wax mold group; Step two: the positions of the wax rods are marked on a plane to be installed of the wax mold group by using the positioning holes of the positioning template, and then the wax rods with bolts are installed in place; Step three: positioning sheets are installed on the positioning holes of the positioning template, and the position precision of the bolts is checked by using the positioning sheets. The step three specifically comprises the following steps. Firstly, a runner cup wax mold is passed through a middle column bolt and is bonded with a middle column runner, the height of the runner cup wax mold is the same as that of the wax rod after bonding; Then, positioning sheets are respectively installed on the plurality of positioning holes and the center positioning hole of the positioning template, each positioning sheet is provided with a plurality of grooves along the edges of the positioning sheet, the positioning sheets are fixed on the positioning template by using a plurality of positioning columns matched with the grooves; The center of each positioning sheet is a bolt positioning hole matched with the size of the bolt, and the diameter of the bolt positioning hole is smaller than that of the corresponding bolt hole on the mechanical hand tray; Then, the positioning template with the positioning sheets is placed on the top surface of the runner cup wax mold and the plurality of wax rods, the middle column bolt on the wax mold group is taken as a reference to check whether the bolts of the wax rods can smoothly pass through the bolt positioning holes of the positioning sheets on the positioning template, if a bolt cannot enter the corresponding bolt positioning hole, the corresponding wax rod needs to be removed and is reinstalled according to the position of the bolt positioning hole; Step four: after the position precision of the bolts is qualified, the positioning template is removed, and the mechanical hand tray is connected with the wax mold group.

2. The method of assembling a robot tray and a wax pattern group in a moulding process of a metal box according to claim 1, wherein, The material of the positioning template is acrylic plate.

3. The method of assembling a robot tray and a wax pattern group in a moulding process of a metal box according to claim 1, wherein, The step two specifically comprises the following steps. Firstly, the positioning template is fixed on the plane to be installed of the wax mold group by matching the center positioning hole on the positioning template with the middle column runner on the wax mold group; The positions of the wax rods to be installed are marked on the plane to be installed of the wax mold group along the inner edges of the positioning holes of the positioning template; Then, the positioning template placed on the wax mold group is removed, and the wax rods with bolts are vertically bonded at the marked positions of the wax mold group.

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