Method for assembling manipulator tray and wax module in cartridge receiver investment casting process

Abstract

The invention relates to the technical field of aero-engine casing investment casting, in particular to a method for assembling a mechanical arm tray and a wax module in a casing investment casting process. The positioning holes, matched with the bolt holes of the manipulator tray, in the positioning template are used for determining the mounting positions of the wax rods on the wax module, after the wax rods and the bolts are mounted, the positioning template is used for correcting the positions of the bolts on the mounted wax rods, and after the positions are determined to be accurate, the wax module is connected with the manipulator tray. The positioning template is used for calibrating the position of the connecting bolt, complex operation of repeatedly measuring the position of the wax module connecting bolt and the size of a tray positioning hole through a measuring tool is omitted, the connecting efficiency of a large complex casing mechanical arm shell manufacturing wax module can be improved, and inaccurate positioning caused by inaccurate measurement can be avoided; and the problem that the module is difficult to connect or the connection position is deviated is solved.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft engine casing investment casting, and in particular to an assembly method of a manipulator tray and a wax mold group in a casing investment casting process. Background Art

[0002] The casing castings for aircraft engines or gas turbines are large in size and complex in structure. The wax molds used for casting are also more complex and heavy. When using a robot to make the casing, it must be connected to the robot at multiple points. This requires the bolts embedded in the wax mold and the bolt holes of the robot tray to be accurately positioned before connection, so that all the connecting bolts can be inserted into the tray bolt holes and tightened, so that the casing wax mold and the robot have good connection strength and can withstand the gravity, torque, centrifugal force, etc. during the casing making process. The conventional method is to first measure the position of the bolt holes on the robot tray, and then measure the position of the corresponding connecting bolts on the wax mold that need to be installed, mark them, and proceed one by one.

[0003] Due to the heavy weight of the manipulator tray, it is impossible to directly compare the mounting holes of the manipulator tray with the bolt positions of the wax model. Instead, the manipulator tray and the wax model can only be repeatedly calibrated with the help of measuring tools. Moreover, since large and complex wax models of casings require many bolts to be connected, there will be deviations when measuring and installing the bolts, making the whole process very complicated, time-consuming, and labor-intensive. It may also be impossible to connect due to one or several position offsets, or the bolt holes of the manipulator tray may be too large to be connected, which may greatly reduce the strength of the connection, resulting in the wax model being cracked during slurry adhesion and being scrapped, or inclusion defects in the casting caused by the slurry drilling into the cracks. Summary of the invention

[0004] The purpose of the present invention is to conveniently, quickly and accurately locate the preset position of the connecting bolts between the large and complex casing wax module and the manipulator tray, and after the installation is completed, to conveniently, quickly and accurately calibrate the connection with the tray, so as to ensure the connection strength between the large and complex casing wax module and the manipulator tray, improve the production efficiency of the large and complex casing manipulator shell making and avoid the risk of module cracking during the shell making process.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for assembling a manipulator tray and a wax mold assembly in a casing investment casting process, comprising the following contents:

[0006] Step 1: Make a positioning template that matches the manipulator tray, the positioning template is provided with a plurality of positioning holes and a central positioning hole, the center and number of openings of the positioning holes are consistent with the bolt holes on the manipulator tray, the center of the central positioning hole is consistent with the center column bolt hole on the manipulator tray, and the diameter of the positioning hole is larger than the diameter of the wax rod, and the diameter of the central positioning hole is larger than the diameter of the center column runner;

[0007] Step 2: Use the positioning holes of the positioning template to mark the positions of each wax rod on the plane where the wax mold set is to be installed, and then install the wax rod with bolts in place;

[0008] The step 2 specifically includes: firstly, the positioning template is fixed on the plane where the wax model is to be installed by aligning the central positioning hole on the positioning template with the center column runner on the wax model;

[0009] Along the inner edges of the positioning holes of the positioning template, mark the positions where the wax rods need to be installed on the plane where the wax mold set is to be installed;

[0010] Then remove the positioning template placed on the wax model set, and vertically bond the wax rod with bolts to the marked position of the wax model set;

[0011] Step 3: Install the positioning pieces on the positioning holes of the positioning template, and use the bolt positioning holes located in the center of each positioning piece to check the position accuracy of the bolts;

[0012] The step three specifically includes: first, passing the pouring cup wax model through the center column bolt and bonding it to the center column runner, and after bonding, the height of the pouring cup wax model is the same as the wax rod;

[0013] Then, positioning pieces are respectively installed on the multiple positioning holes and the central positioning hole of the positioning template, each positioning piece is provided with multiple grooves along its edge, and the positioning piece is fixed on the positioning template by using multiple positioning columns engaged with the grooves;

[0014] Located at the center of each positioning piece is a bolt positioning hole that matches the size of the bolt, and the diameter of the bolt positioning hole is smaller than the diameter of the corresponding bolt hole on the manipulator tray;

[0015] After that, place the positioning template with the positioning sheet flat on the top surface of the pouring cup wax model and multiple wax rods, and use the center column bolt on the wax model set as a reference to check whether the bolts of each wax rod can smoothly pass through the bolt positioning holes of each positioning sheet on the positioning template. If any bolt cannot enter the corresponding bolt positioning hole during the process, it is necessary to remove the corresponding wax rod and reinstall it according to the position of the bolt positioning hole;

[0016] Step 4: After the bolt position accuracy is qualified, remove the positioning template and connect the robot tray to the wax mold;

[0017] Preferably, the positioning template is made of acrylic sheet.

[0018] The beneficial effects of the present invention are as follows: the method can directly calibrate the position of the connection bolts with the positioning plate, eliminating the cumbersome operation of repeatedly measuring the position of the connection bolts of the wax mold and the size of the positioning holes of the tray with the measuring tool, improving the connection efficiency of the wax mold of the large and complex casing manipulator shell by more than 3 times, and avoiding the difficulty of connecting the mold or the displacement of the connection position due to inaccurate positioning caused by inaccurate measurement, resulting in the mold falling from the manipulator during the coating process or the mold cracking and scrapping during the slurry adhesion, or the inclusion defects of the casting due to the slurry drilling into the cracks. The economic losses of complex large mold production can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the robot pallet from a top view;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure in the middle AA direction;

[0021] Figure 3 A schematic diagram of using a positioning template to determine the position of the wax rod of a wax model set;

[0022] Figure 4 It is a schematic diagram of the top view of the structure of the positioning template;

[0023] Figure 5 for Figure 4 Schematic diagram of the structure in the middle AA direction;

[0024] Figure 6 A schematic diagram of the structure of a positioning piece for a positioning template;

[0025] Figure 7 It is a structural schematic diagram of the inner and outer layer positioning sheets;

[0026] Figure 8 It is a schematic diagram of the structure of the intermediate layer positioning sheet;

[0027] Fig. 9 It is a structural schematic diagram of the center hole positioning piece;

[0028] Fig.10 Schematic diagram for checking bolt positions using a positioning template;

[0029] In the figure: 1. Positioning template; 2. Middle layer positioning hole; 3. Center positioning hole; 4. Inner and outer layer positioning holes; 5. Positioning column; 6. Robot tray; 7. Middle layer bolt hole; 8. Middle column bolt hole; 9. Inner and outer layer bolt holes; 10. Inner and outer layer positioning pieces; 11. Inner and outer layer bolt positioning holes; 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. Pouring cup wax mold; 20. Middle column runner; 21. Wax mold assembly. 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 are 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. Figure 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 middle column bolt hole 8 with a hole diameter of 32 mm located at 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 at the center of the wax mold 21 need to be provided on the wax mold 21, wherein a portion 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 a plurality of 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 middle column bolts 18 and the middle 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 wax model group 21 is installed with a bolt 16 with a wax rod 17, the positioning hole on the positioning template 1 that matches the bolt hole of the manipulator tray 6 is first used to determine the installation position of the wax rod 17 on the wax model 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 wax rod 17 after installation. After determining that the position is accurate, the wax model group 21 is connected to the manipulator tray 6. The wax model 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 Figure 4-5As shown, the positioning template 1 is provided with multiple positioning holes and a central 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 central 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, and the diameter of the central 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 which are concentric with the middle layer bolt holes 7 and have the same number, and inner and outer layer positioning holes 4 which are concentric with the inner and outer layer bolt holes 9 and have the same 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 that it has a certain rigidity and is not too heavy. It is convenient to operate under the premise of ensuring the positioning flatness of the positioning template 1. Here, the thickness is selected to be 8 mm;

[0039] The material of the positioning template 1 is preferably acrylic sheet, which is transparent, light and has certain rigidity. Since the middle layer positioning hole 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 verticality of the wax rod 17 has a certain deviation during installation, the diameter of the middle layer positioning hole 2 and the inner and outer layer positioning hole 4 is 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 by 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 robot 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 set 21 is to be installed, and install the wax rod 17 with the bolt 16 in place;

[0043] Specifically, Figure 3 As shown, first, the central positioning hole 3 on the positioning template 1 corresponds to the middle 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 used as the template of the manipulator 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 position where the wax rod 17 needs to be installed can be traced on the plane where the wax mold assembly 21 is to be installed along the inner edge of each positioning hole on the positioning template 1 by using a colored pen or other marking method;

[0045] Then remove the positioning template 1 placed on the wax model set 21, and align the wax rod 17 with the bolt 16 with the mark drawn on the wax model set 21 and bond it vertically;

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

[0047] Step 3: Check the position accuracy of the bolt 16, specifically:

[0048] like Fig.10 As shown, first, the pouring cup wax mold 19 passes through the center column bolt 18 and is bonded to the center column runner 20, and the height of the pouring cup wax mold 19 is the same as the wax rod 17;

[0049] Then, respectively install positioning pieces on the multiple positioning holes and the central positioning hole 3 of the positioning template 1, such as Figure 4 and Figure 6 As shown, it includes: inner and outer layer positioning pieces 10 installed on the inner and outer layer positioning holes 4, an intermediate layer positioning piece 12 installed on the intermediate layer positioning hole 2, and a center hole positioning piece 14 installed on the center positioning hole 3, each positioning piece is provided with a plurality of grooves along its edge, and the positioning piece is fixed on the positioning template 1 by using a positioning column 5 engaged with the groove;

[0050] Located at the center of each positioning piece is a bolt positioning hole that matches 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 robot tray 6, such as Figure 7-10 As shown, the bolt positioning holes include: an inner and outer layer bolt positioning hole 11 located at the center of the inner and outer layer positioning piece 10, an intermediate layer bolt positioning hole 13 located at the center of the intermediate layer positioning piece 12, and a center column bolt positioning hole 15 located at the center of the center hole positioning piece 14;

[0051] In this embodiment, the diameters of the inner and outer layer bolt positioning holes 11 are 20 mm, the diameter of the middle layer bolt positioning holes 13 is 25 mm, and the diameter of the center column bolt positioning holes 15 is 31 mm.

[0052] Afterwards, place the positioning template 1 with the positioning plates flat on the top surface of the pouring cup wax mold 19 and multiple wax rods 17, and use the center column bolt 18 as a reference to check whether the bolts 16 of each wax rod 17 can smoothly pass through the bolt positioning holes of each positioning plate on the positioning template 1. If any bolt 16 cannot enter the corresponding bolt positioning hole during the process, it is necessary to remove the corresponding wax rod 17 and reinstall it according to the position of the bolt positioning hole.

[0053] Step 4: After the position accuracy of the bolt 16 is qualified, remove the positioning template 1 and connect the robot tray 6 to the wax mold assembly 21;

[0054] Specifically, since the positioning holes of the positioning template 1 are in the same position as the bolt holes on the manipulator tray 6, and the diameter of the bolt positioning holes of the positioning template 1 is smaller than the diameter of the corresponding bolt holes on the manipulator tray 6, the bolts 16 that have been calibrated by the positioning template 1 can be easily inserted into the corresponding bolt holes on the manipulator tray 6, and then equipped with corresponding nuts to complete the connection between the manipulator tray 6 and the wax mold assembly 21.

Claims

1. A method for assembling a manipulator tray and a wax mold assembly in a casing investment casting process, characterized in that: Includes the following: Step 1: Make a positioning template that matches the manipulator tray, the positioning template is provided with a plurality of positioning holes and a central positioning hole, the center and number of openings of the positioning holes are consistent with the bolt holes on the manipulator tray, the center of the central positioning hole is consistent with the center column bolt hole on the manipulator tray, and the diameter of the positioning hole is larger than the diameter of the wax rod to be fixed on the wax model assembly, and the diameter of the central positioning hole is larger than the diameter of the center column runner on the wax model assembly; Step 2: Use the positioning holes of the positioning template to mark the positions of each wax rod on the plane where the wax mold set is to be installed, and then install the wax rod with bolts in place; Step 3: Install the positioning piece on the positioning hole of the positioning template and use the positioning piece to check the position accuracy of the bolt; Step 4: After the bolt position accuracy is qualified, remove the positioning template and connect the robot tray to the wax mold.

2. The method for assembling a manipulator tray and a wax mold assembly in a casing investment casting process according to claim 1, characterized in that: The material of the positioning template is acrylic sheet.

3. The method for assembling a manipulator tray and a wax mold assembly in a casing investment casting process according to claim 1, characterized in that: The step 2 specifically includes: First, the positioning template is fixed on the plane where the wax model is to be installed by aligning the central positioning hole on the positioning template with the center column runner on the wax model; Along the inner edges of the positioning holes of the positioning template, mark the positions where the wax rods need to be installed on the plane where the wax mold set is to be installed; Then remove the positioning template placed on the wax model set, and vertically glue the wax rod with bolts to the marked position of the wax model set.

4. The method for assembling a manipulator tray and a wax mold assembly in a casing investment casting process according to claim 1, characterized in that: The step three specifically includes: First, pass the sprue cup wax model through the center column bolt and bond it to the center column runner. After bonding, the height of the sprue cup wax model is the same as the wax rod. Then, positioning pieces are respectively installed on the multiple positioning holes and the central positioning hole of the positioning template, each positioning piece is provided with multiple grooves along its edge, and the positioning piece is fixed on the positioning template by using multiple positioning columns engaged with the grooves; Located at the center of each positioning piece is a bolt positioning hole that matches the size of the bolt, and the diameter of the bolt positioning hole is smaller than the diameter of the corresponding bolt hole on the manipulator tray; Afterwards, place the positioning template with positioning plates flat on the top surface of the pouring cup wax mold and multiple wax rods. Using the center column bolt on the wax mold assembly as a reference, check whether the bolts of each wax rod can smoothly pass through the bolt positioning holes of each positioning plate on the positioning template. If any bolt cannot enter the corresponding bolt positioning hole during the process, it is necessary to remove the corresponding wax rod and reinstall it according to the position of the bolt positioning hole.

Images