Seed crystal surface treatment tool and method for single crystal blade

Abstract

The invention discloses a seed crystal surface treatment tool and method for a single crystal blade. The tool comprises a clamping table, a clamping block, a pressing plate and a pressing screw. A seed crystal is placed on the clamping block, and the clamping block is located in the clamping table; the pressing plate is positioned above the clamping block; and the compression screw is vertically mounted on the clamping table above the pressing plate. The method comprises the following steps: cutting to prepare a seed crystal, and ultrasonically cleaning the seed crystal in an alcohol solution; clamping and fixing the seed crystal on a tool; performing sand blasting and polishing on the exposed surface of the seed crystal by adopting a dry powder sand blasting method to finish primary removal of an oxide layer on the surface of the seed crystal; acid pickling is conducted on the exposed surface of the seed crystal through an acid pickling method, an oxide layer on the surface of the seed crystal is removed again, and then the surface of the seed crystal is washed clean with clear water. According to the method, the requirement for removing the oxide layer on the seed crystal in batches can be met, the surface treatment process combining sand blasting and acid pickling is adopted, the uniformity of removing the oxide layer on the surface of the seed crystal can be achieved, the preparation efficiency of the seed crystal can be greatly improved, and therefore the actual production requirement can be better met.

Description

Technical Field

[0001] The invention belongs to the technical field of manufacturing parts of aviation engines, and in particular relates to a seed crystal surface treatment tool and method for single crystal blades. Background Art

[0002] Direct casting of seed crystals or electrospark cutting of single crystal test bars or test pieces is a common method for preparing seed crystal samples. However, there will be an oxide layer of a certain thickness on the surface of the seed crystal sample, which will not only affect the analysis and test of the crystal orientation, but also easily lead to the formation of impurity defects in the process of preparing single crystals from seed crystals.

[0003] Therefore, in order not to affect the analysis and testing of crystal orientation and avoid impurity defects in the process of preparing single crystals from seed crystals, mechanical grinding and polishing is usually used to remove the oxide layer on the surface of the seed crystal sample. However, the working efficiency of mechanical grinding and polishing is low, and the seed crystal reference surface is prone to grinding deviation, which not only reduces the preparation efficiency of the seed crystal, but also makes it difficult to meet the actual production needs. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a tool and method for surface treatment of seed crystals for single crystal blades, which can meet the needs of batch removal of oxide layers of seed crystals. A surface treatment process combining sand blasting and pickling is adopted to achieve uniform removal of oxide layers on the surface of seed crystals, which can greatly improve the preparation efficiency of seed crystals, thereby better meeting actual production needs.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a seed crystal surface treatment tool for a single crystal blade, comprising a clamping table, a clamping block, a pressure plate and a clamping screw; the clamping block is used to place the seed crystal, and the clamping block is located inside the clamping table; the pressure plate is located above the clamping block; the clamping screw is vertically installed on the clamping table above the pressure plate.

[0006] The clamping table adopts an inverted T-shaped groove structure, and the clamping block adopts a rectangular parallelepiped structure. A plurality of seed crystal slots are evenly distributed on the upper and lower surfaces of the clamping block, and the seed crystal slots on the upper surface of the clamping block are staggered with the seed crystal slots on the lower surface of the clamping block.

[0007] The pressing plate is located in the inverted T-shaped groove of the clamping platform, and a first rubber pad is fixedly mounted on the lower surface of the pressing plate; a second rubber pad is fixedly mounted on the bottom surface of the inverted T-shaped groove of the clamping platform.

[0008] A rubber protective plate is arranged between the clamping platform and the seed crystal, and a seed crystal penetration hole is arranged on the rubber protective plate.

[0009] There are two clamping screws, and each of the two clamping arms at the top of the inverted T-shaped groove of the clamping platform is equipped with a clamping screw, and the screw end of the clamping screw is directly opposite to the upper surface of the pressure plate.

[0010] A positioning block is arranged on the back of the clamping platform, and the positioning block is fixedly connected to the clamping platform by fastening screws.

[0011] A method for treating the surface of a seed crystal for a single crystal blade, using the tooling for treating the surface of a seed crystal for a single crystal blade, comprises the following steps:

[0012] Step 1: Seed crystal preparation and cleaning

[0013] First, the seed crystal is cut and prepared by a wire cutting machine, and then the cut seed crystal is placed in an alcohol solution, and then ultrasonic cleaning is used in the alcohol solution to remove oil stains on the surface of the seed crystal;

[0014] Step 2: Clamping and fixing of seed crystal

[0015] First, send the clamping block into the inverted T-shaped groove of the clamping table, the lower surface of the clamping block fits with the second rubber pad, and the rear surface of the clamping block fits with the positioning block. Then, insert the seed crystals into all the seed crystal slots of the clamping block one by one. Then, place the pressure plate above the clamping block so that the first rubber pad is between the upper seed crystal and the pressure plate. Then, tighten the two clamping screws until the pressure plate presses and fixes the upper seed crystal in the upper seed crystal slot of the clamping block through the first rubber pad. At the same time, the clamping table clamps and fixes the lower seed crystal in the lower seed crystal slot of the clamping block through the second rubber pad. Then, align the seed crystal insertion hole on the rubber protective plate with the clamped seed crystal, and pass the seed crystal through the seed crystal insertion hole on the rubber protective plate until the rubber protective plate and the clamping table fit together.

[0016] Step 3: Sand blasting of seed crystal

[0017] The surface of the seed crystal located outside the rubber protective plate is sandblasted and polished by dry powder sandblasting until the initial removal of the oxide layer on the surface of the seed crystal is completed;

[0018] Step 4: Pickling of seed crystal

[0019] First, the surface of the seed crystal located on the outside of the rubber protective plate is pickled by pickling until the oxide layer on the surface of the seed crystal is removed again, and then the surface of the seed crystal is rinsed with clean water.

[0020] Beneficial effects of the present invention:

[0021] The tooling and method for surface treatment of seed crystals for single crystal blades of the present invention can meet the needs of batch oxide layer removal of seed crystals. The surface treatment process combining sand blasting and acid pickling can achieve uniform removal of oxide layers on the surface of seed crystals, which can greatly improve the preparation efficiency of seed crystals, thereby better meeting actual production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a structural schematic diagram of a seed crystal surface treatment tool for a single crystal blade (rubber protection plate is not shown) of the present invention (viewing angle 1);

[0023] Figure 2 It is a structural schematic diagram of a seed crystal surface treatment tool for a single crystal blade of the present invention (viewing angle 2);

[0024] Figure 3 It is a structural schematic diagram of the clamping block of the present invention;

[0025] In the figure, 1 is a clamping table, 2 is a clamping block, 3 is a pressure plate, 4 is a clamping screw, 5 is a seed crystal, 6 is a seed crystal slot, 7 is a first rubber pad, 8 is a second rubber pad, 9 is a rubber protective plate, 10 is a positioning block, and 11 is a fastening screw. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 3 As shown, a tool for surface treatment of seed crystals for single crystal blades includes a clamping table 1, a clamping block 2, a pressure plate 3 and a clamping screw 4; the clamping block 2 is used to place a seed crystal 5, and the clamping block 2 is located inside the clamping table 1; the pressure plate 3 is located above the clamping block 2; the clamping screw 4 is vertically installed on the clamping table 1 above the pressure plate 3.

[0028] The clamping table 1 adopts an inverted T-shaped groove structure, and the clamping block 2 adopts a rectangular structure. A plurality of seed crystal slots 6 are evenly distributed on the upper and lower surfaces of the clamping block 2, and the seed crystal slots 6 on the upper surface of the clamping block 2 are staggered with the seed crystal slots 6 on the lower surface of the clamping block 2.

[0029] The pressing plate 3 is located in the inverted T-shaped groove of the clamping platform 1 , and a first rubber pad 7 is fixedly mounted on the lower surface of the pressing plate 3 ; a second rubber pad 8 is fixedly mounted on the bottom surface of the inverted T-shaped groove of the clamping platform 1 .

[0030] A rubber protection plate 9 is provided between the clamping platform 1 and the seed crystal 5 , and a hole for inserting the seed crystal 5 is provided in the rubber protection plate 9 .

[0031] There are two clamping screws 4 , and each of the two clamping arms at the top of the inverted T-shaped groove of the clamping platform 1 is equipped with a clamping screw 4 , and the screw end of the clamping screw 4 is opposite to the upper surface of the pressing plate 3 .

[0032] A positioning block 10 is provided on the back of the clamping platform 1 , and the positioning block 10 is fixedly connected to the clamping platform 1 via a fastening screw 11 .

[0033] A method for treating the surface of a seed crystal for a single crystal blade, using the tooling for treating the surface of a seed crystal for a single crystal blade, comprises the following steps:

[0034] Step 1: Preparation and cleaning of seed crystal 5

[0035] First, the seed crystal 5 is cut and prepared by a wire cutting machine, and then the cut seed crystal 5 is placed in an alcohol solution, and then the oil stains on the surface of the seed crystal 5 are removed by ultrasonic cleaning in the alcohol solution;

[0036] In this embodiment, the seed crystal 5 is a DD5 single crystal high temperature alloy test rod, the cross-section of the seed crystal 5 is a square, the side length of the square is 2.8 mm, and the length of the seed crystal 5 is 35 mm;

[0037] Step 2: Clamping and fixing of seed crystal 5

[0038] First, send the clamping block 2 into the inverted T-shaped groove of the clamping platform 1, the lower surface of the clamping block 2 is in contact with the second rubber pad 8, and the rear surface of the clamping block 2 is in contact with the positioning block 10, and then the seed crystals 5 are inserted into all the seed crystal slots 6 of the clamping block 2 one by one, and then the pressure plate 3 is placed above the clamping block 2, so that the first rubber pad 7 is between the upper seed crystal 5 and the pressure plate 3, and then the two clamping screws 4 are tightened until the pressure plate 3 presses and fixes the upper seed crystal 5 in the upper seed crystal slot 6 of the clamping block 2 through the first rubber pad 7, and at the same time, the clamping platform 1 clamps and fixes the lower seed crystal 5 in the lower seed crystal slot 6 of the clamping block 2 through the second rubber pad 8, and then the seed crystal 5 insertion hole on the rubber protective plate 9 is aligned with the clamped seed crystal 5, so that the seed crystal 5 passes through the seed crystal 5 insertion hole on the rubber protective plate 9 until the rubber protective plate 9 and the clamping platform 1 are in contact with each other;

[0039] In this embodiment, the cross-sectional shape of the seed crystal slot 6 is designed to match the seed crystal 5, the insertion depth of the seed crystal 5 in the seed crystal slot 6 is 5 mm, and the length of the seed crystal 5 outside the seed crystal slot 6 is 30 mm; the thickness of the rubber protective plate 9 is 1 mm;

[0040] Step 3: Sand blasting of seed crystal 5

[0041] The surface of the seed crystal 5 located outside the rubber protection plate 9 is sandblasted and polished by using a dry powder sandblasting method until the initial removal of the oxide layer on the surface of the seed crystal 5 is completed;

[0042] In this embodiment, the dry powder used for sandblasting and polishing is 100#-180# corundum sand, the sandblasting pressure is 0.2MPa-0.6MPa, and the distance between the sandblasting nozzle and the surface of the seed crystal 5 is 100mm-250mm; during the sandblasting process, the clamping table 1 can be continuously rotated to improve the uniformity of the sandblasting on the surface of the seed crystal 5;

[0043] Step 4: Pickling of Seed Crystal 5

[0044] First, the surface of the seed crystal 5 located outside the rubber protection plate 9 is pickled by pickling until the oxide layer on the surface of the seed crystal 5 is removed again, and then the surface of the seed crystal is rinsed with clean water.

[0045] In this embodiment, the pickling liquid is a ferric chloride etching liquid, the concentration of the ferric chloride solution in the etching liquid is 280g / L~350g / L, the concentration of the hydrochloric acid solution in the etching liquid is 160g / L~180g / L, and the pickling immersion time of the seed crystal 5 in the ferric chloride etching liquid is 15min~20min.

[0046] Furthermore, the sand blasting treatment step and the pickling treatment of the seed crystal 5 can be repeated 2-4 times to ensure that the oxide layer on the surface of the seed crystal 5 is fully removed.

[0047] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. A tool for treating the surface of a seed crystal for a single crystal blade, characterized in that: It includes a clamping platform, a clamping block, a pressure plate and a clamping screw; the clamping block is used to place the seed crystal, and the clamping block is located inside the clamping platform; the pressure plate is located above the clamping block; and the clamping screw is vertically installed on the clamping platform above the pressure plate.

2. The single crystal blade seed crystal surface treatment tool according to claim 1, characterized in that: The clamping table adopts an inverted T-shaped groove structure, and the clamping block adopts a rectangular parallelepiped structure. A plurality of seed crystal slots are evenly distributed on the upper and lower surfaces of the clamping block, and the seed crystal slots on the upper surface of the clamping block are staggered with the seed crystal slots on the lower surface of the clamping block.

3. The surface treatment tool for a seed crystal for a single crystal blade according to claim 2, characterized in that: The pressing plate is located in the inverted T-shaped groove of the clamping platform, and a first rubber pad is fixedly mounted on the lower surface of the pressing plate; a second rubber pad is fixedly mounted on the bottom surface of the inverted T-shaped groove of the clamping platform.

4. The single crystal blade seed crystal surface treatment tool according to claim 3, characterized in that: A rubber protective plate is arranged between the clamping platform and the seed crystal, and a seed crystal penetration hole is arranged on the rubber protective plate.

5. The single crystal blade seed crystal surface treatment tool according to claim 4, characterized in that: There are two clamping screws, and each of the two clamping arms at the top of the inverted T-shaped groove of the clamping platform is equipped with a clamping screw, and the screw end of the clamping screw is directly opposite to the upper surface of the pressure plate.

6. The single crystal blade seed crystal surface treatment tool according to claim 5, characterized in that: A positioning block is arranged on the back of the clamping platform, and the positioning block is fixedly connected to the clamping platform by fastening screws.

7. A method for treating the surface of a seed crystal for a single crystal blade, using the tooling for treating the surface of a seed crystal for a single crystal blade according to claim 6, characterized in that: The steps include: Step 1: Seed crystal preparation and cleaning First, the seed crystal is cut and prepared by a wire cutting machine, and then the cut seed crystal is placed in an alcohol solution, and then ultrasonic cleaning is used in the alcohol solution to remove oil stains on the surface of the seed crystal; Step 2: Clamping and fixing of seed crystal First, send the clamping block into the inverted T-shaped groove of the clamping table, the lower surface of the clamping block fits with the second rubber pad, and the rear surface of the clamping block fits with the positioning block. Then, insert the seed crystals into all the seed crystal slots of the clamping block one by one. Then, place the pressure plate above the clamping block so that the first rubber pad is between the upper seed crystal and the pressure plate. Then, tighten the two clamping screws until the pressure plate presses and fixes the upper seed crystal in the upper seed crystal slot of the clamping block through the first rubber pad. At the same time, the clamping table clamps and fixes the lower seed crystal in the lower seed crystal slot of the clamping block through the second rubber pad. Then, align the seed crystal insertion hole on the rubber protective plate with the clamped seed crystal, and pass the seed crystal through the seed crystal insertion hole on the rubber protective plate until the rubber protective plate and the clamping table fit together. Step 3: Sand blasting of seed crystal The surface of the seed crystal located outside the rubber protective plate is sandblasted and polished by dry powder sandblasting until the initial removal of the oxide layer on the surface of the seed crystal is completed; Step 4: Pickling of seed crystal First, the surface of the seed crystal located on the outside of the rubber protective plate is pickled by pickling until the oxide layer on the surface of the seed crystal is removed again, and then the surface of the seed crystal is rinsed with clean water.

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