A processing method for a thin-walled conical cap

Abstract

The invention discloses a processing method for a thin-walled conical cap, which includes the steps of successively preparing forging raw materials, turning the clamping reference, turning the inner conical surface and the process internal thread, milling the process loading and unloading end face groove, turning the outer conical surface and cutting off, benchworker polishing, fluorescence inspection, and washing, inspection and warehousing. By using the processing method of the invention, the dimensions and technical conditions of the processed thin-walled conical cap fully meet the design requirements, the quality of the processed product is stable, and the processing efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, and particularly relates to a machining method for a conical cap part. Background Art

[0002] In recent years, the mechanical equipment manufacturing industry has developed rapidly, and various mechanical equipment has been designed and manufactured to facilitate various activities such as production and life. Mechanical equipment is composed of various parts with different shapes, sizes and functions. For example, Figure 1 and Figure 2 As shown, it is a conical cap part widely used in the fields of aviation and aerospace industries. A typical feature of this type of part is that the wall thickness of the conical surface is very thin, and it is difficult to clamp and position during machining.

[0003] Taking an engine conical cap as an example, the wall thickness of its conical surface is only 1.2 mm. The structure of the part makes it easy to cause part deformation when the part is clamped and machined by general machining methods, and it cannot meet the design requirements. Summary of the Invention

[0004] The present invention aims to provide a machining method for a thin-walled conical cap, which does not require the use of special and complex tooling and special forming equipment. The dimensions and technical conditions of the machined thin-walled conical cap fully meet the design requirements, the quality of the machined product is stable, and the machining efficiency is high.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A machining method for a thin-walled conical cap includes the following steps:

[0007] Step 1: Prepare the forging raw material, and select the bar stock in the forging state as the blank for machining the thin-walled conical cap.

[0008] Step 2: Machine the clamping reference, and the clamping reference is the outer circle of the bar stock and the first axial end face at one end of the bar stock.

[0009] Step 3: Machine the inner conical surface and the process internal thread. Perform turning on the second axial end face at the other end of the bar stock to obtain an inner conical surface in the cap cavity that is consistent with the design dimensions of the thin-walled conical cap part, and a process internal thread on the inner cylindrical surface that is coaxial with the inner conical surface and located at the large-diameter end of the inner conical surface.

[0010] Step 4: Machine the outer conical surface and cut off. Connect the process internal thread at the large-diameter end of the inner conical surface in the cap cavity machined in Step 3 with the external thread on the fixture, so that the part is installed and fixed on the fixture, and then fix the fixture and the lathe through the fixture. Then machine the outer conical surface of the thin-walled conical cap, and cut off the part after obtaining the outer conical surface of the cap that is consistent with the design dimensions. The cutting position is at the end face of the large-diameter end of the thin-walled conical cap.

[0011] Further, after the fourth step, there is also a fifth step, which is benchworker polishing to remove the sharp edge burrs on the cut surface.

[0012] Further, after the fifth step, there is also a sixth step, which is fluorescence inspection to perform fluorescence inspection on the machined thin-walled conical cap parts according to the requirements of the design drawing.

[0013] Further, after the sixth step, there is also a seventh step, which is washing inspection and warehousing. After completing the washing inspection of the thin-walled conical cap parts as required, they are then warehoused.

[0014] As an option, in the second step, the outer circle of the bar stock is turned until it is smooth.

[0015] As an option, in the third step, the machined outer circle of the bar stock in the second step is clamped by a three-jaw chuck, and at the same time, the machined first axial end face of the bar stock in the second step is tightened.

[0016] Further, in the third step, there is also a step of milling the process loading and unloading end face groove. While turning the inner conical surface and the process internal thread, a circular ring machining allowance is reserved on the axial second end face of the bar stock corresponding to the outside of the process internal thread. Taking the circular ring as the process table of the conical cap, a groove is milled on the end face of the process table of the conical cap to machine the process loading and unloading end face groove.

[0017] As an option, there are multiple process loading and unloading end face grooves, and they are symmetrically arranged about the axis of the thin-walled conical cap. The length of the process loading and unloading end face groove does not exceed the length of the process internal thread.

[0018] Further, after completing the step of milling the process loading and unloading end face groove and performing the cutting operation in the fourth step, a wrench is used to clamp the process loading and unloading end face groove and rotate the process table of the conical cap in the reverse direction, so that the process table of the conical cap is gradually disengaged from the threaded connection with the fixture, and the cut part is ejected from the fixture during the disengagement process.

[0019] As an option, in the fourth step, the fixture includes an outer conical surface, an external thread, an annular protrusion, and a cylindrical section that are sequentially distributed coaxially. Among them, the outer conical surface fits with the inner conical surface of the thin-walled conical cap, the external thread is connected to the process internal thread of the thin-walled conical cap, and the annular protrusion and the cylindrical section are located outside the inner conical surface of the thin-walled conical cap.

[0020] The processing method of the present invention has the following characteristics:

[0021] (1) The processing equipment is an ordinary lathe;

[0022] (2) When the conical cap is disengaged from the fixture after cutting, it is driven by the process table, which will not damage the surface of the conical cap and will not cause part deformation;

[0023] (3) The end face groove on the process table facilitates the clamping and disassembly of the parts;

[0024] (4) The structure of the mandrel fixture is simple, easy to machine, and has a wide range of applications.

[0025] Compared with the prior art, by using the processing method of the conical cap provided by the present invention, the processed parts fully meet the design requirements, and the processing quality and efficiency of the product are improved. The fixture used for processing is a mandrel with a simple structural shape, and the processing equipment used is an ordinary lathe. Description of the Drawings

[0026] Figure 1 is the three-dimensional solid drawing of the conical cap provided by the present invention;

[0027] Figure 2 is Figure 1 the two-dimensional sectional view of the conical cap in

[0028] Figure 3 is the process flow chart of the processing method of the conical cap in the present invention;

[0029] Figure 4 is the schematic diagram of turning the inner conical surface and the process internal thread in the present invention;

[0030] Figure 5 is the schematic diagram of milling the process loading and unloading end face groove in the present invention;

[0031] Figure 6 is Figure 5 the schematic diagram of the A-A section in

[0032] Figure 7 is the schematic diagram before turning the outer conical surface in the present invention;

[0033] Figure 8 is Figure 7 the schematic diagram of the B-B section in

[0034] Figure 9 is the schematic diagram after turning the outer conical surface in the present invention;

[0035] Figure 10 is Figure 9 the schematic diagram of the B-B section in

[0036] In the figure, 1 - part to be processed, 2 - mandrel fixture, 3 - part after cutting, 4 - conical cap process table left after cutting the part. Detailed Embodiments

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above technical idea of the present invention, all modifications, substitutions, and changes made according to ordinary technical knowledge and conventional means in the art are included in the scope of the present invention.

[0038] In order to machine a thin-walled conical cap such as Figure 1 and 2 shown, the present invention provides a machining method for a conical cap part, as Figure 3 , which specifically includes the following steps:

[0039] Step 1: Prepare the forging raw material: Prepare 1 piece of the forging raw material required for the conical cap part: the forging specification is φ90×70;

[0040] Step 2: Flatten the end face and turn the outer circle: Use the three-jaw chuck of the lathe to clamp the outer circle at one end of the forging, and turn the outer circle and end face at the other end for use as the clamping reference for turning the inner conical surface and the process internal thread in Step 3. Refer to Figure 4 , Figure 4 where the left end face of the forging in

[0041] is tightly pressed, and the outer circle is clamped by the three-jaw chuck; Figure 4 Step 3: Turn the inner surface and the process internal thread hole: Use a soft three-jaw chuck to clamp the machined outer circle of the forging, and perform turning machining on the inner conical surface of the conical cap to obtain a cap inner cavity structure (i.e., the inner conical surface) consistent with the design dimensions. At the same time, machine the process internal thread for use in clamping when turning the outer conical surface in Step 4. Refer to

[0042] Step 4: Milling the process loading and unloading end face groove: Mill the groove on the end face of the process table of the conical cap to machine the process loading and unloading end face groove for turning the outer conical surface of the conical cap. Refer to Figure 5 and Figure 6 . There are a total of 4 process loading and unloading end face grooves, which are distributed at the ends of two perpendicular and intersecting diameter lines.

[0043] Step 5: Turn the outer surface and cut off: Refer to Figure 7 and Figure 8 , use the process internal thread of the conical cap to connect with the external thread on the mandrel fixture 2, hold the process loading and unloading end face groove with a wrench, and install and fix the part to be machined 1 on the mandrel fixture 2. Figure 8 In Figure 9 and Figure 10 the end face B of the mandrel fixture 2 in, use a wrench to hold the disassembly groove of the conical cap cover process table 4 left after the part is cut off, and make the conical cap cover process table 4 left after the part is cut off rotate in the opposite direction relative to the mandrel fixture 2. The conical cap cover process table 4 left after the part is cut off will move to the right and be withdrawn from the mandrel fixture 2. During the process of being withdrawn by reverse rotation, the conical cap cover process table 4 left after the part is cut off will push out the cut-off part 3 attached to the conical surface of the mandrel fixture 2 after cutting and disengage it from the conical surface of the mandrel fixture 2;

[0044] Step Six: Fitter polishing: Place the cut-off part 3 on the fitter's bench and remove the sharp edge burrs on the cut-off surface by polishing;

[0045] Step Seven: Fluorescent inspection: Conduct fluorescent inspection on the cut-off part 3 according to the requirements of the design drawing;

[0046] Step Eight: Washing inspection and warehousing: After completing the washing inspection as required, the parts are warehoused.

[0047] Adopting the conical cap cover processing method provided by the present invention can fully meet the design requirements without using special complex tooling for clamping and processing. The processing of the mandrel fixture 2 is simple and can be prepared by oneself, improving the processing quality and efficiency of the product.

[0048] Through processing verification, using the processing method of the present invention, the processed thin-walled conical cap cover fully meets the design requirements in terms of dimensions and technical conditions, and the quality of the processed product is stable.

[0049] The content not described in detail in the specification of the present invention belongs to the prior art well-known to those skilled in the art. Although the illustrative specific embodiments of the present invention are described above for the understanding of those skilled in the art of the present technology, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

Claims

1. A processing method for a thin-walled conical cap, characterized in that: It includes the following steps, Step 1: Prepare the forging raw material and select a bar in the forged state as the blank for processing the thin-walled conical cap; Step 2: Machine the clamping reference. The clamping reference is the outer circle of the bar and the first axial end face at one end of the bar; Step 3: Machine the inner conical surface and the process internal thread. Perform turning on the second axial end face at the other end of the bar to obtain an inner conical surface in the cap cavity that is consistent with the design dimensions of the thin-walled conical cap part, and a process internal thread on the inner cylindrical surface that is coaxial with the inner conical surface and located at the large-diameter end of the inner conical surface; Step 4: Machine the outer conical surface and cut off. Use the process internal thread at the large-diameter end of the inner conical surface in the cap cavity machined in Step 3 to connect with the external thread on the fixture, so that the part is installed and fixed on the fixture, and the fixture is clamped and fixed on the lathe through the fixture. Then machine the outer conical surface of the thin-walled conical cap, and cut off the part after obtaining the outer conical surface that is consistent with the design dimensions. The cutting position is at the end face of the large-diameter end of the thin-walled conical cap.

2. The processing method of a thin-walled conical cap according to claim 1, characterized in that: After Step 4, there is also Step 5, which is benchworker polishing. Remove the sharp-edge burrs on the cutting surface through polishing.

3. The processing method of a thin-walled conical cap according to claim 2, wherein: After Step 5, there is also Step 6, which is fluorescence inspection. Perform fluorescence inspection on the processed thin-walled conical cap part according to the requirements of the design drawing.

4. The processing method of a thin-walled conical cap according to claim 3, characterized in that: After Step 6, there is also Step 7, which is washing inspection and warehousing. Complete the washing inspection of the thin-walled conical cap part as required, and then put it into storage.

5. The processing method of a thin-walled conical cap according to claim 1, characterized in that: In Step 2, the outer circle of the bar is machined until it is shiny.

6. The processing method of a thin-walled conical cap according to claim 1, characterized in that: In Step 3, use a three-jaw chuck to clamp the machined outer circle of the bar in Step 2, and at the same time press tightly against the machined first axial end face of the bar in Step 2.

7. A processing method for a thin-walled conical cap according to claim 1, characterized in that: Step 3 also includes the step of milling the process loading and unloading end face groove. When machining the inner conical surface and the process internal thread, reserve a circular ring machining allowance outside the process internal thread on the second axial end face of the bar. Use the circular ring as the process platform of the conical cap, and perform milling groove machining on the end face of the process platform of the conical cap to machine the process loading and unloading end face groove.

8. The processing method of a thin-walled conical cap according to claim 7, wherein: There are multiple process loading and unloading end face grooves, and they are symmetrically arranged about the axis of the thin-walled conical cap. The length of the process loading and unloading end face groove does not exceed the length of the process internal thread.

9. The processing method of a thin-walled conical cap according to claim 7, characterized in that: When the step of milling the process loading and unloading end face groove is completed and the cutting operation in Step 4 is carried out, use a wrench to clamp the process loading and unloading end face groove and rotate the process platform of the conical cap in the reverse direction, so that the process platform of the conical cap gradually disengages from the threaded connection with the fixture, and the cut part is ejected from the fixture during the disengagement process.

10. The processing method of a thin-walled conical cap according to claim 1, characterized in that: In Step 4, the fixture includes an outer conical surface, an external thread, an annular protrusion, and a cylindrical section that are distributed sequentially and coaxially. Among them, the outer conical surface fits with the inner conical surface of the thin-walled conical cap, the external thread is connected with the process internal thread of the thin-walled conical cap, and the annular protrusion and the cylindrical section are located outside the inner conical surface of the thin-walled conical cap.

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