A design method of a fixture for roll blade linear cutting

Abstract

This invention provides a design method for a fixture used in wire EDM of rolled blades. The fixture is mounted on an wire EDM machine to achieve accurate positioning and clamping of the rolled blades. The fixture consists of three parts: a base plate, a blade process boss clamping mechanism, and a blade body clamping mechanism. The base plate connects the blade process boss clamping mechanism and the blade body clamping mechanism. The fixture is mounted on the worktable of the wire EDM machine via the base plate, which also serves for alignment on the machine. Advantages of this invention: significantly improved economic efficiency; the fixture can process 6-12 blades at a time; high efficiency; accurate positioning; stable clamping; convenient operation; strong versatility; one set of fixtures can be used for multiple processes; and it cleverly solves the clamping problem of spatial curved blade shapes.

Description

Technical Field

[0001] This invention relates to the field of aero-engine blade manufacturing technology, and in particular to a design method for a fixture used in wire EDM machining of rolled blades. Background Technology

[0002] Aero-engine blade manufacturing technology is one of the most complex technologies in turbine machinery manufacturing, and it also involves a wide range of professional fields within the machinery manufacturing industry. Therefore, the level of blade manufacturing technology reflects, to a certain extent, the level of aero-engine manufacturing technology.

[0003] Precision cold rolling of blade profiles involves passing the blade blank through a pair of rotating rolling dies, where the pressure exerted on the metal by the die grooves causes plastic deformation, thereby obtaining the required blade profile. This process offers significant advantages over CNC milling, precision forging, and precision electrolysis in terms of manufacturing cost, production efficiency, and the resulting microstructure and properties.

[0004] Stator blades of this type have no mounting plates at either end and require four wire EDM machining processes. Due to the large number of these blades produced, single-blade wire EDM significantly impacts processing efficiency, necessitating more machine tools and fixtures to meet production demands. Simultaneous machining of multiple blades can lead to instability in blade clamping due to variations in the blade's positioning table, affecting machining quality. During the fourth wire EDM step, the blade is cut off. As the blade approaches the cut, its weight can cause it to fall, resulting in residual cutting marks or damage to the blade. Residual cutting marks require manual correction, while damaged blades are rendered unusable.

[0005] Therefore, designing a fixture for wire EDM of rolled blades that allows for simultaneous processing of multiple blades, accurate positioning, and blade profile support can improve the processing quality, increase production efficiency, and reduce production costs. The application of this fixture in the production process of segmented rolled blades is of great significance. Summary of the Invention

[0006] The purpose of this invention is to summarize and establish a design method for a fixture used in wire EDM of rolled blades. The fixture designed using this method can simultaneously process multiple blades, provides accurate positioning, and offers blade profile support. This improves the quality of wire EDM processing of this type of rolled blade, increases production efficiency, and reduces production costs.

[0007] This invention provides a design method for a fixture for wire EDM of rolled blades, characterized in that: the fixture for wire EDM of rolled blades is installed on a wire EDM machine tool to achieve accurate positioning and clamping of the rolled blades on the fixture, and the fixture is divided into three parts: a base plate, a blade process boss clamping, and a blade body clamping.

[0008] The base plate is used to connect the blade process boss clamping part and the blade body clamping assembly. The fixture is mounted on the worktable of the wire EDM machine through the base plate. The base plate is also used for the alignment of the fixture on the machine tool.

[0009] The blade manufacturing boss clamping part includes a positioning base, a hinge quick-press assembly, a blade slot clamping assembly, and a side clamping assembly;

[0010] The positioning base is used for positioning the blade process bosses. The hinge quick-press assembly, blade slot clamping assembly, and side clamping assembly are mounted on the positioning base. The positioning base has a positioning surface for positioning the blade process bosses. The depth of the positioning surface is 6 to 12 times the thickness of the blade process bosses, and it can clamp 6 to 12 rolled blades at the same time.

[0011] The hinge quick-press assembly is installed above the positioning base. When the hinge quick-press wrench is moved, the pressure head of the hinge quick-press assembly can quickly press the blade process boss clamp in the up and down direction.

[0012] The slot clamping assembly is installed in the middle of the positioning base and passes through it. The slot clamping assembly includes a clamping hook, a spring, a clamping bolt, and a rubber sheet. The clamping hook is installed in the clamping hook hole of the positioning base. By tightening the clamping bolt, the clamping hook moves towards the positioning base and clamps the blade. When the clamping bolt is loosened, the clamping hook moves in the opposite direction of the positioning base under the action of the spring and releases the blade. The part of the clamping hook that contacts the blade is bonded or sprayed with a rubber sheet with a thickness of 0.8 to 1.5 mm.

[0013] The side clamping assembly is installed on the side of the positioning base. The side clamping assembly includes a clamping block, a polyurethane block, a spring, a clamping bolt, and a support bolt. Tightening the clamping bolt moves the clamping block towards the positioning base, clamping the blade. Loosening the clamping bolt causes the clamping block to move in the opposite direction to the positioning base under the action of the spring, releasing the blade. A polyurethane block with a Shore hardness of 70-90 is embedded at the contact point between the clamping block and the blade. The thickness of the polyurethane block is not less than 8mm, and the embedding depth is 1 / 2 to 2 / 3 of the thickness of the polyurethane block. The outer dimension of the polyurethane block is 0.1-0.2mm larger than the corresponding groove size on the clamping block. During assembly, adhesive is applied to the bottom of the groove on the clamping block, and the polyurethane block is pressed into the groove and adhered. The support bolt is used to adjust the parallel clamping of the clamping block, and the top surface of the support bolt is flush with the outer surface of the polyurethane block.

[0014] The side blade clamping assembly is mounted on a base plate. The assembly includes a rotating support, an adjusting rod, a set screw, a fixed U-groove assembly, and an elastic U-groove assembly. The clamping assembly is connected to the base plate via the rotating support, with the gap between the lower end of the rotating support and the corresponding hole in the base plate being between 0.02 and 0.05 mm. One end of the adjusting rod is installed in a groove at the upper end of the rotating support, and the other end has a groove for adjusting the fixed U-groove assembly. The fixed U-groove assembly can slide on the adjusting rod with a gap between 0.1 and 0.2 mm. The adjusting rod supports the fixed U-groove assembly and adjusts its position relative to the rotating support. After adjustment, the set screw is used to fix its position.

[0015] The fixed U-shaped groove assembly consists of a support rod, a fixed U-shaped groove, a nut, and a sponge; the support rod is connected to the fixed U-shaped groove via the nut, and the depth of the fixed U-shaped groove is 2 / 3 to 1 of the maximum width of the blade; the opening of the fixed U-shaped groove is provided with a slot, and the sponge with a thickness of 1 / 2 to 2 / 3 of the depth of the U-shaped groove and a density of 45D to 55D is bonded inside;

[0016] The elastic U-shaped groove assembly consists of an elastic U-shaped groove and a sponge. The elastic U-shaped groove is made of an elastic metal material. When a force of 30-50N is applied inward to the groove end, the groove end can deform by 1-2mm. After the applied force is removed, the elastic U-shaped groove returns to its original state. The sum of the depths of the elastic U-shaped groove and the fixed U-shaped groove is 1.3-1.5 times the maximum width of the blade profile. The sponge with a density of 45D-55D is bonded inside the elastic U-shaped groove with a thickness of 1 / 2 to 2 / 3 of the groove depth.

[0017] Compared with the prior art, the advantages of this invention are:

[0018] According to the design method of the fixture for wire EDM of rolled blades, the designed fixture has been successfully applied to production, significantly improving the processing efficiency and pass rate of blades, reducing a large amount of scrap loss annually. It has achieved good results in application, and with increased production capacity and wider application, the economic benefits will be significantly enhanced. The fixture for wire EDM of rolled blades can process 6-12 blades at a time, offering high efficiency, accurate positioning, stable clamping, convenient operation, and strong versatility. One set of fixtures can be used for multiple processes, cleverly solving the clamping problem of spatial curved blade shapes. Attached Figure Description

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 Fixtures for wire EDM machining of rolled blades;

[0021] 1-Positioning base; 2-Base plate; 3-Hinge quick-press assembly; 4-Side clamping assembly; 5-Blade slot clamping assembly; 6-Blade clamping assembly

[0022] Figure 2 Blade slot clamping assembly;

[0023] 5-Rubber sheet 6-Pressure hook 7-Pressure bolt 8-Spring

[0024] Figure 3 Side clamping assembly;

[0025] 9-Clamping block 10-Clamping bolt 11-Spring 12-Support bolt 13-Polyurethane adhesive block

[0026] Figure 4 Blade clamping assembly;

[0027] 14-Fixed U-groove 15-Sponge 16-Elastic U-groove 17-Sponge 2 18-Connecting screw 19-Connecting rod 20-Setting screw 21-Rotating support 22-Adjusting rod Detailed Implementation

[0028] The present invention will be further explained below with reference to specific implementation schemes, but it is not limited to the present invention. The structures, proportions, sizes, etc. shown in the accompanying drawings are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0029] Example 1

[0030] This invention provides a design method for a fixture for wire EDM of rolled blades, characterized in that: the fixture for wire EDM of rolled blades is installed on a wire EDM machine tool to achieve accurate positioning and clamping of the rolled blades on the fixture, and the fixture is divided into three parts: a base plate, a blade process boss clamping, and a blade body clamping.

[0031] The base plate is used to connect the blade process boss clamping part and the blade body clamping assembly. The fixture is mounted on the worktable of the wire EDM machine through the base plate. The base plate is also used for the alignment of the fixture on the machine tool.

[0032] The blade manufacturing boss clamping part includes a positioning base, a hinge quick-press assembly, a blade slot clamping assembly, and a side clamping assembly;

[0033] The positioning base is used for positioning the blade process bosses. The hinge quick-press assembly, blade slot clamping assembly, and side clamping assembly are mounted on the positioning base. The positioning base has a positioning surface for positioning the blade process bosses. The depth of the positioning surface is 6 to 12 times the thickness of the blade process bosses, and it can clamp 6 to 12 rolled blades at the same time.

[0034] The hinge quick-press assembly is installed above the positioning base. When the hinge quick-press wrench is moved, the pressure head of the hinge quick-press assembly can quickly press the blade process boss clamp in the up and down direction.

[0035] The slot clamping assembly is installed in the middle of the positioning base and passes through it. The slot clamping assembly includes a clamping hook, a spring, a clamping bolt, and a rubber sheet. The clamping hook is installed in the clamping hook hole of the positioning base. By tightening the clamping bolt, the clamping hook moves towards the positioning base and clamps the blade. When the clamping bolt is loosened, the clamping hook moves in the opposite direction of the positioning base under the action of the spring and releases the blade. The part of the clamping hook that contacts the blade is bonded or sprayed with a rubber sheet with a thickness of 0.8 to 1.5 mm.

[0036] The side clamping assembly is installed on the side of the positioning base. The side clamping assembly includes a clamping block, a polyurethane block, a spring, a clamping bolt, and a support bolt. Tightening the clamping bolt moves the clamping block towards the positioning base, clamping the blade. Loosening the clamping bolt causes the clamping block to move in the opposite direction to the positioning base under the action of the spring, releasing the blade. A polyurethane block with a Shore hardness of 70-90 is embedded at the contact point between the clamping block and the blade. The thickness of the polyurethane block is not less than 8mm, and the embedding depth is 1 / 2 to 2 / 3 of the thickness of the polyurethane block. The outer dimension of the polyurethane block is 0.1-0.2mm larger than the corresponding groove size on the clamping block. During assembly, adhesive is applied to the bottom of the groove on the clamping block, and the polyurethane block is pressed into the groove and adhered. The support bolt is used to adjust the parallel clamping of the clamping block, and the top surface of the support bolt is flush with the outer surface of the polyurethane block.

[0037] The side blade clamping assembly is mounted on a base plate. The blade clamping assembly includes a rotating support, an adjusting rod, a set screw, a fixed U-groove assembly, and an elastic U-groove assembly. The blade clamping assembly is connected to the base plate via the rotating support, and the gap between the lower end of the rotating support and the corresponding hole of the base plate is between 0.02 and 0.05 mm. One end of the adjusting rod is installed in the groove at the upper end of the rotating support, and the other end is provided with a groove for adjusting the fixed U-groove assembly. The fixed U-groove assembly can slide on the adjusting rod, which is used to support the fixed U-groove assembly and adjust the position of the fixed U-groove assembly relative to the rotating support. After adjustment, the position is fixed using the set screw.

[0038] The fixed U-shaped groove assembly consists of a support rod, a fixed U-shaped groove, a nut, and a sponge; the support rod is connected to the fixed U-shaped groove via the nut, and the depth of the fixed U-shaped groove is 2 / 3 to 1 of the maximum width of the blade; the opening of the fixed U-shaped groove is provided with a slot, and the sponge with a thickness of 1 / 2 to 2 / 3 of the depth of the U-shaped groove and a density of 45D to 55D is bonded inside;

[0039] The elastic U-shaped groove assembly consists of an elastic U-shaped groove and a sponge. The elastic U-shaped groove is made of an elastic metal material. When a force of 30 to 50 N is applied inward to the groove end, the groove end can deform by 1 to 2 mm. After the applied force is removed, the elastic U-shaped groove returns to its original state. The elastic U-shaped groove is bonded with a sponge with a thickness of 1 / 2 to 2 / 3 of the U-shaped groove depth and a density of 45D to 55D.

[0040] Example 2

[0041] The blade positioning table measures 21mm × 15mm × 2mm, the blade length is 65mm, and the maximum blade width is 18mm. The fixture is designed to clamp 10 blades at a time.

[0042] The fixture consists of three parts: a base plate, blade process boss clamping, and blade body clamping. The base plate has external dimensions of 150mm × 60mm × 15mm, and a leveling band is provided on the front end face of the base plate. The positioning base is designed with threaded holes and pin holes for connecting the base plate, the hinge quick-press assembly, and the side clamping assembly. Additionally, a clamping hook slot is designed according to the shape of the clamping hook.

[0043] Select the hinge quick-press assembly according to the dimensions of the blade process positioning table and install it on top of the positioning base. Position the pressure head of the hinge quick-press assembly at the center of the blade process positioning table.

[0044] The slot clamping assembly includes a clamping hook, a spring, and a clamping bolt. The clamping bolt is an M6 socket head cap screw, the spring wire has a diameter of 0.8mm, and a 0.8mm thick rubber sheet is bonded at the contact point between the clamping hook and the blade.

[0045] The side clamping assembly includes a clamping block, a spring, clamping bolts, and support bolts. The clamping bolts are M6 socket head cap screws, and the spring wire diameter is 1mm. A 10mm thick polyurethane block with a Shore A hardness of 75A is embedded in the part of the clamping block that contacts the blade, with an embedding depth of 6mm. The outer dimensions of the polyurethane block are 0.1mm larger than the corresponding groove size on the clamping block. Adhesive is applied to the bottom of the groove on the clamping block, and the polyurethane block is pressed into the groove and adhered.

[0046] The blade clamping assembly includes a rotating support, an adjusting rod, a set screw, a fixed U-groove assembly, and a flexible U-groove assembly. The gap between the lower end of the rotating support and the corresponding hole in the base plate is 0.02mm.

[0047] The fixed U-shaped channel assembly includes a support rod, a fixed U-shaped channel, a nut, and a sponge. The support rod is connected to the fixed U-shaped channel via the nut. The fixed U-shaped channel has a depth of 16mm, and a retaining groove is provided at the opening of the fixed U-shaped channel. A 9mm thick sponge with a density of 45D is bonded inside the fixed U-shaped channel.

[0048] The flexible U-shaped channel assembly consists of a flexible U-shaped channel body and a sponge. The flexible U-shaped channel body is machined from 0.5mm thick copper sheet. When a 30N inward force is applied to the channel opening, the opening end deforms by 1mm. After the force is removed, the flexible U-shaped channel body returns to its original state. The depth of the flexible U-shaped channel is 16mm, and a 9mm thick, 45D density sponge is bonded inside the channel depth.

[0049] Before use, adjust the height of the hinge quick-press assembly's pressure head, the position of the adjusting rod and the support rod of the fixed U-groove assembly, and tighten the clamping screws to meet the blade clamping requirements. The blade clamping sequence is to install 10 blades on the fixture, first tighten the hinge quick-press assembly, then tighten the groove clamping assembly, and finally tighten the side clamping assembly. Pinch the opening of the elastic U-groove body, place its end face into the slot of the fixed U-groove assembly, compress the sponge to support the blade body, and then release the elastic U-groove body to perform blade processing.

[0050] Example 3

[0051] The blade positioning table measures 32mm × 15mm × 2.5mm, the blade length is 80mm, and the maximum blade width is 30mm. The fixture is designed to clamp 8 blades at a time.

[0052] The fixture consists of three parts: a base plate, blade process boss clamping, and blade body clamping. The base plate has external dimensions of 150mm × 80mm × 15mm, and a leveling band is provided on the front end face of the base plate. The positioning base is designed with threaded holes and pin holes for connecting the base plate, the hinge quick-press assembly, and the side clamping assembly. A clamping hook slot is also designed according to the shape of the clamping hook.

[0053] Select the hinge quick-press assembly according to the dimensions of the blade process positioning table and install it on top of the positioning base. Position the pressure head of the hinge quick-press assembly at the center of the blade process positioning table.

[0054] The slot clamping assembly includes a clamping hook, a spring, and a clamping bolt. The clamping bolt is an M8 hex socket head cap screw, the spring wire has a diameter of 1mm, and a 1.2mm thick rubber sheet is bonded at the contact point between the clamping hook and the blade.

[0055] The side clamping assembly includes a clamping block, a spring, clamping bolts, and support bolts. The clamping bolts are M8 hex socket head cap screws, and the spring wire diameter is 1.2mm. A 10mm thick polyurethane block with a Shore A hardness of 80A is embedded in the area where the clamping block contacts the blade, with an embedding depth of 6mm. The outer dimensions of the polyurethane block are 0.15mm larger than the corresponding groove size on the clamping block. Adhesive is applied to the bottom of the groove on the clamping block, and the polyurethane block is pressed into the groove and adhered.

[0056] The blade clamping assembly includes a rotating support, an adjusting rod, a set screw, a fixed U-groove assembly, and a flexible U-groove assembly. The gap between the lower end of the rotating support and the corresponding hole in the base plate is 0.03mm.

[0057] The fixed U-shaped channel assembly includes a support rod, a fixed U-shaped channel, a nut, and a sponge. The support rod is connected to the fixed U-shaped channel via the nut. The fixed U-shaped channel has a depth of 20mm, and a retaining groove is provided at the opening of the fixed U-shaped channel. A 12mm thick sponge with a density of 55D is bonded inside the fixed U-shaped channel.

[0058] The flexible U-shaped channel assembly consists of a flexible U-shaped channel body and a sponge. The flexible U-shaped channel body is machined from 0.5mm thick copper sheet. When a 30N inward force is applied to the channel opening, the opening end deforms by 1.5mm. After the force is removed, the flexible U-shaped channel body returns to its original state. The depth of the flexible U-shaped channel is 20mm, and a 12mm thick, 55D density sponge is bonded inside the channel depth.

[0059] Before use, adjust the height of the hinge quick-press assembly's pressure head, the position of the adjusting rod and the support rod of the fixed U-groove assembly, and tighten the clamping screws to meet the blade clamping requirements. The blade clamping sequence is as follows: install 8 blades on the fixture, first tighten the hinge quick-press assembly, then tighten the groove clamping assembly, and finally tighten the side clamping assembly. Pinch the opening of the elastic U-groove body, place its end face into the slot of the fixed U-groove assembly, compress the sponge to support the blade body, and then release the elastic U-groove body to perform blade processing.

[0060] Matters not covered in this invention are common knowledge.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A design method for a fixture used in wire EDM of rolled blades, characterized in that: A fixture for wire EDM of rolled blades is installed on a wire EDM machine to achieve accurate positioning and clamping of rolled blades. The fixture consists of three parts: a base plate, a blade process boss clamping mechanism, and a blade body clamping mechanism. The base plate is used to connect the blade process boss clamping part and the blade body clamping assembly. The fixture is mounted on the worktable of the wire EDM machine tool via the base plate. The base plate is also used for aligning the fixture on the machine tool. The blade process boss clamping part includes a positioning base, a hinge quick-press assembly, a blade slot clamping assembly, and a side clamping assembly. The positioning base is used for positioning the blade process bosses. The hinge quick-press assembly, blade slot clamping assembly, and side clamping assembly are installed on the positioning base. The positioning base is provided with a positioning surface for positioning the blade process bosses. The depth of the positioning surface is 6 to 12 times the thickness of the blade process bosses, and it can clamp 6 to 12 rolled blades at the same time. The blade clamping assembly is mounted on a base plate. The blade clamping assembly includes a rotating support, an adjusting rod, a set screw, a fixed U-groove assembly, and an elastic U-groove assembly. The blade clamping assembly is connected to the base plate via the rotating support, with the gap between the lower end of the rotating support and the corresponding hole in the base plate being between 0.02 and 0.05 mm. One end of the adjusting rod is installed in a groove at the upper end of the rotating support, and the other end has a groove for adjusting the fixed U-groove assembly. The fixed U-groove assembly can slide on the adjusting rod, which supports the fixed U-groove assembly and adjusts its position relative to the rotating support. After adjustment, the set screw is used to fix its position. The fixed U-shaped groove assembly consists of a support rod, a fixed U-shaped groove, a nut, and a sponge; the support rod is connected to the fixed U-shaped groove through the nut, and the depth of the fixed U-shaped groove is 2 / 3 to 1 of the maximum width of the blade; the opening of the fixed U-shaped groove is provided with a slot, and the sponge with a thickness of 1 / 2 to 2 / 3 of the depth of the U-shaped groove and a density of 45D to 55D is bonded inside; The elastic U-shaped groove assembly consists of an elastic U-shaped groove and a sponge. The elastic U-shaped groove is made of an elastic metal material. When a force of 30-50N is applied inward to the groove end, the groove end can deform by 1-2mm. After the applied force is removed, the elastic U-shaped groove returns to its original state. The sum of the depths of the elastic U-shaped groove and the fixed U-shaped groove is 1.3-1.5 times the maximum width of the blade profile. The sponge with a density of 45D-55D is bonded inside the elastic U-shaped groove with a thickness of 1 / 2 to 2 / 3 of the groove depth.

2. The design method of the fixture for wire EDM of rolled blades according to claim 1, characterized in that: The hinge quick-press assembly is installed above the positioning base. When the hinge quick-press wrench is moved, the pressure head of the hinge quick-press assembly can quickly press the blade process boss clamp in the up and down direction. The slot clamping assembly is installed in the middle of the positioning base and passes through it. The slot clamping assembly includes a clamping hook, a spring, a clamping bolt, and a rubber sheet. The clamping hook is installed in the clamping hook hole of the positioning base. By tightening the clamping bolt, the clamping hook moves towards the positioning base and clamps the blade. When the clamping bolt is loosened, the clamping hook moves in the opposite direction of the positioning base under the action of the spring and releases the blade. The part of the clamping hook that contacts the blade is bonded or sprayed with a rubber sheet with a thickness of 0.8 to 1.5 mm.

3. The design method of the fixture for wire EDM of rolled blades according to claim 1, characterized in that: The side clamping assembly is installed on the side of the positioning base. The side clamping assembly includes a clamping block, a polyurethane block, a spring, a clamping bolt, and a support bolt. By tightening the clamping bolt, the clamping block moves towards the positioning base, clamping the blade. By loosening the clamping bolt, the clamping block moves in the opposite direction to the positioning base under the action of the spring, releasing the blade. A polyurethane block with a hardness of Shore 70-90 is embedded in the part of the clamping block that contacts the blade. The thickness of the polyurethane block is not less than 8mm, and the embedding depth is 1 / 2 to 2 / 3 of the thickness of the polyurethane block. The outer dimension of the polyurethane block is 0.1-0.2mm larger than the corresponding groove size on the clamping block. During assembly, adhesive is applied to the bottom of the groove on the clamping block, and the polyurethane block is pressed into the groove and fitted. The support bolt is used to adjust the parallel clamping of the clamping block, and the top surface of the support bolt is flush with the outer surface of the polyurethane block.

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