A processing tool for thin-walled stainless steel frame and a using method thereof

Abstract

The present application relates to a kind of processing tool of thin-walled stainless steel frame and use method.Thin-walled frame wall thickness is smaller and is constituted by multiple circular arc profile surface, and 6 hole positions are needed to be processed in the cylindrical surface of product, product is easily deformed when processing, and clamping position is more difficult to select.The tool of the present application includes tool body, axial fastener end cap and nut, radial fastener bolt composition.The shaft shoulder of its tool body is provided with first end surface groove, and there are three bosses on tool body, corresponding the mounting position of end cap, second end surface groove is provided on end cap, product radial run-out is prevented using two end surface grooves, tool body plays the role of mandrel and supports product, radial fastener prevents product from rotating when processing product arc.The tool realizes the axial clamping and radial fixation of product, simple structure, easy operation, can reliably clamp similar structure thin-walled part, ensure the machining precision of product and improve machining efficiency.

Description

Technical Field

[0001] This invention relates to the field of mechanical tooling, and in particular to a processing tooling for thin-walled stainless steel frames and its usage method. Background Technology

[0002] Thin-walled stainless steel frames are a typical aerospace engine component. However, due to their small wall thickness (generally 1mm to 3mm), curved contours, and easy material deformation, they are difficult to clamp during direct machining, making it impossible to guarantee design requirements. Existing internal support tooling is prone to tool interference when machining curved surfaces, and the product is prone to circumferential rotation during machining. Excessive clamping force can also easily cause product deformation. Therefore, a new tooling is urgently needed to meet the product machining requirements. Summary of the Invention

[0003] The technical problem solved by this method is to overcome the shortcomings of the existing technology and provide a processing fixture and method for thin-walled stainless steel frames. The fixture needs to solve three problems: easy interference of the tool when processing arc surfaces, easy rotation of the product in the circumferential direction during processing, and easy deformation of the product due to excessive clamping force.

[0004] The technical solution of this method is: a processing fixture for a thin-walled stainless steel frame, including a fixture body, an axial fastener end cap and a nut, and a radial fastener bolt; The tooling body is a cylindrical stepped shaft structure, which acts as a mandrel to support the stainless steel frame. It includes a first shoulder and a second shoulder. One end of the cylindrical stepped shaft structure is externally threaded. Two annular grooves are machined between the tail of the external thread and the first shoulder. A third annular groove is machined between the first and second shoulders. The first shoulder has a first end face groove on the side facing the external thread. A flat surface is machined on the second shoulder. Multiple radial internal threaded holes are machined inside an annular groove near the external thread. Multiple bosses are axially arranged in the annular groove. The bosses correspond to the installation position of the end cap. The end cap has a second end face groove. The first and second end face grooves are used to prevent the stainless steel frame from radially running. The radial fastener bolts cooperate with the radial internal threaded holes to prevent the product from rotating when machining the arc of the stainless steel frame. The nuts are used to cooperate with the external thread to fasten the end cap.

[0005] Preferably, the end cap is an annular structure with a central hole, and multiple protrusions are provided on the outer edge of the structure. A second end face groove is provided on the side of the protrusion, and a processing window is formed between adjacent protrusions. The position of the window corresponds to the position of the arc to be processed on the stainless steel frame. The protrusions correspond to the positions of the bosses on the tooling body.

[0006] Preferably, the nut and the tooling body are provided with markings, and the tightening force is controlled by the markings. After tightening, the markings on the nut do not exceed the markings on the tooling body.

[0007] Preferably, the stainless steel frame has a wall thickness of 1mm to 3mm.

[0008] Preferably, the gap between the mandrel and the stainless steel frame is 0.01 mm - 0.03 mm.

[0009] The method for processing a thin-walled stainless steel frame using the aforementioned processing fixture includes: X1: Install the round sleeve-shaped semi-finished product: First, install the tool body on the machine tool fixture, then install the semi-finished product on the tool body, then install the end cover. The three windows of the end cover correspond to the three end face grooves of the tool body. Then screw the nut into the external thread at the front end of the tool body, and finally tighten the end face nut. The markings on the nut should not exceed the markings on the tool body. X2: Align the tooling position: Rotate the machine tool A-axis to align the plane position on the second axis shoulder, setting the A-axis to 0°; X3: Machining Holes: Set the program to automatically rotate the machine tool's A-axis and Z-axis to machine multiple holes on the product. At this time, the machined holes on the product will correspond exactly to the positions of the radial threaded holes on the tooling body. X4: Secure the product's circumferential position: Use radial fastener bolts to pass through the product's holes and screw them into the radial threaded holes of the tooling body to prevent circumferential rotation during product processing; X5: The arc position on the processed product; X6: Disassembling the product.

[0010] Advantages of this method compared to existing technologies: (1) When using this tooling to process the arc surface of thin-walled stainless steel products, the tool will not interfere, and the product will not rotate in the circumferential direction during processing; (2) It can achieve rapid and accurate tooling alignment and is easy to operate; (3) By using scribing and tooling structural design, the clamping force of the product can be controlled to prevent product deformation and ensure the first-time pass rate of the product. (4) The tooling structure is simple, reliable and practical, and the installation time is short, which reduces the workload of workers; (5) By using this tooling, multiple holes and multiple arcs can be processed at once, which improves processing efficiency.

[0011] (6) The tooling has the advantages of simple structure, convenient operation, and can quickly and reliably clamp thin-walled parts with similar structures, prevent product deformation, ensure product processing accuracy and improve processing efficiency. Attached Figure Description

[0012] Figure 1 It is an exploded view of the tooling and the product; Among them, 1-nut, 2-end cap, 3-product, 4-bolt, 5-tool body; Figure 2 It's a product image; Figure 3 This is a drawing of the tooling itself; Among them, 6-external thread, 7-boss, 8-internal thread hole, 9-first shoulder, 10-plane, 11-second shoulder; Figure 4 It is an end cap; Figure 5 It is an assembly drawing of tooling and products. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1-5 The invention will be further described in detail with examples.

[0014] This invention provides a machining fixture and method for thin-walled stainless steel frames. A newly designed mandrel assembly fixture is used, with a clearance of 0.01~0.03mm between the mandrel and the product. The fixture position is precisely aligned by setting a plane on the fixture body; bosses, annular grooves, and windows are provided to ensure accurate installation of the cover plate and prevent tool interference during milling; end face grooves and radial internal threaded holes are provided to assist in fixing the product; and the clamping force is controlled by marking lines on the nut, allowing for the completion of product hole machining and contour machining in one operation. This prevents errors caused by repeated clamping and alignment, and prevents product deformation during machining.

[0015] Stainless steel frame products as shown in the attached document Figure 2 The wall thickness shown is 1mm~3mm, such as Figure 1 As shown, the tooling of the present invention includes a tooling body 5, an axial fastener end cap 2 and a nut 1, and a radial fastener bolt 4.

[0016] The tool body is attached. Figure 3 The first shoulder 9 shown has a first end face groove on its left side. A plane 10 is milled on the second shoulder 11. There are three bosses 7 on the tooling body, corresponding to the installation position of the end cover. The end cover has a second end face groove. The two end face grooves are used to prevent the product from radially running. The tooling body acts as a spindle to support the product. The radial fastener bolts 4 prevent the product from rotating when machining the arc of the product. In a preferred embodiment of the present invention, the tooling body is a cylindrical stepped shaft structure with external threads machined at its end. A first end face groove is machined on the first shoulder 9, and three windows are machined on the shoulder to facilitate tool entry. A flat surface is milled on the second shoulder to facilitate product positioning. Two annular grooves are machined between the tail of the external thread and the first shoulder, and a third annular groove is machined between the first and second shoulders to facilitate the descent of the milling cutter. Multiple radial internal thread holes are machined inside the annular grooves to facilitate bolt screwing in. like Figure 4As shown, the end cap 2 is provided with a second end face groove, and three windows are machined on the end cap to facilitate tool entry. The three windows of the end cap correspond to the positions of the three end face grooves of the tool body, which can control the installation position of the end cap to prevent interference with the tool. The nut and the tooling body of this invention have engraved lines to facilitate control of the tightening force. After tightening, the engraved lines on the nut do not exceed the engraved lines on the tooling body.

[0017] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. The stainless steel frame is processed in the following six steps: X1: Install the semi-finished product (round sleeve). First, install the tooling on the machine tool fixture, then install the semi-finished product on the tooling body, and then install the end cover. The three windows of the end cover correspond to the three end face grooves of the tooling body. Then screw the nut into the external thread at the front end of the tooling, and finally tighten the end face nut. The markings on the nut should not exceed the markings on the tooling body. X2: Align the tooling position, rotate the machine tool A axis, align the plane position on the second shoulder, and set the A axis to 0°.

[0018] X3: Machining holes. Set the program to automatically rotate the machine tool's A-axis and Z-axis to machine the 6 holes on the product. At this time, the machined holes on the product will correspond exactly to the positions of the radial threaded holes on the tooling body. X4: Secure the product's circumference by passing a bolt through the product's hole and screwing it into the radial threaded hole of the tooling body to prevent circumferential rotation during product processing. X5: The arc position on the machined product; the assembly drawing of the tooling and the machined product is shown below. Figure 5 As shown.

[0019] X6: Disassembling the product.

[0020] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0021] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A machining fixture for a thin-walled stainless steel frame, characterized in that: Includes the tooling body, axial fastener end caps and nuts, and radial fastener bolts; The tooling body is a cylindrical stepped shaft structure, which acts as a mandrel to support the stainless steel frame. It includes a first shoulder and a second shoulder. One end of the cylindrical stepped shaft structure is externally threaded. Two annular grooves are machined between the tail of the external thread and the first shoulder. A third annular groove is machined between the first and second shoulders. The first shoulder has a first end face groove on the side facing the external thread. A flat surface is machined on the second shoulder. Multiple radial internal threaded holes are machined inside an annular groove near the external thread. Multiple bosses are axially arranged in the annular groove. The bosses correspond to the installation position of the end cap. The end cap has a second end face groove. The first and second end face grooves are used to prevent the stainless steel frame from radially running. The radial fastener bolts cooperate with the radial internal threaded holes to prevent the product from rotating when machining the arc of the stainless steel frame. The nuts are used to cooperate with the external thread to fasten the end cap.

2. The machining fixture for the thin-walled stainless steel frame according to claim 1, characterized in that: The end cap is a ring-shaped structure with a central hole. Multiple protrusions are provided on the outer edge of the structure. A second end face groove is provided on the side of the protrusion. A processing window is formed between adjacent protrusions. The position of the window corresponds to the position of the arc to be processed on the stainless steel frame. The protrusions correspond to the positions of the bosses on the tooling body.

3. The machining fixture for the thin-walled stainless steel frame according to claim 1, characterized in that: The nut and the tool body are marked with scribe lines. The tightening force is controlled by the scribe lines. After tightening, the scribe lines on the nut do not exceed the scribe lines on the tool body.

4. The machining fixture for the thin-walled stainless steel frame according to claim 1, characterized in that: The wall thickness of the stainless steel frame is 1mm~3mm.

5. The machining fixture for the thin-walled stainless steel frame according to claim 1, characterized in that: The gap between the mandrel and the stainless steel frame is 0.01 mm - 0.03 mm.

6. A method for processing a thin-walled stainless steel frame using the processing fixture for a thin-walled stainless steel frame as described in claim 3, characterized in that... include: X1: Install the round sleeve-shaped semi-finished product: First, install the tool body on the machine tool fixture, then install the semi-finished product on the tool body, then install the end cover. The three windows of the end cover correspond to the three end face grooves of the tool body. Then screw the nut into the external thread at the front end of the tool body, and finally tighten the end face nut. The markings on the nut should not exceed the markings on the tool body. X2: Align the tooling position: Rotate the machine tool A-axis to align the plane position on the second axis shoulder, setting the A-axis to 0°; X3: Machining Holes: Set the program to automatically rotate the machine tool's A-axis and Z-axis to machine multiple holes on the product. At this time, the machined holes on the product will correspond exactly to the positions of the radial threaded holes on the tooling body. X4: Secure the product's circumferential position: Use radial fastener bolts to pass through the product's holes and screw them into the radial threaded holes of the tooling body to prevent circumferential rotation during product processing; X5: The arc position on the processed product; X6: Disassembling the product.

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