Combined tool for machining small-diameter inner hole and large-depth annular groove and machining method

Abstract

The invention discloses a combined tool for machining a small-diameter inner hole large-depth annular groove and a machining method, relates to the technical field of tool equipment, and effectively solves the problems that in the current machining process of the small-diameter inner hole large-depth annular groove, cutting force is too large, and chip removal is difficult. The problem that a cutter bar vibrates violently due to too large cutting force in the energetic material forming turning process is solved, meanwhile, the problems that a cutter is damaged and machining accidental ignition is caused due to the fact that cuttings block the position close to a cutting edge can be solved, and forming of the energetic material small-diameter inner hole large-depth annular groove becomes possible. And the machining quality and the safety of the machining process are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tool equipment, and in particular to a combined tool and a processing method for machining a small-diameter inner hole with a large-depth annular groove. Background Art

[0002] Cutting is the most feasible method to form deep annular grooves in small diameter (≤120 mm) inner holes of energetic materials. Existing inner hole boring cutters can only process small depth annular grooves due to size limitations. In order to achieve deep annular groove processing, it is necessary to consider both cutting force and chip removal stability.

[0003] In the prior art, a forming tool whose width is equal to the width of the annular groove and whose radius is consistent with the arc radius of the top of the annular groove is usually used for processing. This processing method has many disadvantages. On the one hand, the height of the tool itself is too large, which affects the design of the feed mechanism; on the other hand, the cutting force is too large during processing, causing the tool rod to undergo large displacement deformation, resulting in severe vibration or even breakage of the tool rod; in addition, the chip width generated by the arc tool is greater than the width of the annular groove, which will cause difficulty in chip discharge and easily cause chip blockage, threatening processing safety.

[0004] Patent CN207071684 describes a W-shaped inner ring groove turning tool, which can realize the processing of inner ring grooves at different positions by telescoping the tool bar. The tool is fixed and the processing depth of the ring groove is limited by the length of the tool itself. However, the double "V"-shaped blade design can directly process the W-shaped inner ring groove. However, due to the limitation of the tool's own length, it cannot process a deep ring groove.

[0005] Patent No. CN 113751740 A describes a grooving tool for inner ring groove groups. The tool body is designed with four parallel and spaced cutting edges, which can process three ring grooves at one time. However, the cutting edge length is 5 mm, and the maximum processing ring groove depth is 5 mm, which cannot achieve a greater depth of ring groove processing, and there is a possibility of chip blockage. Summary of the invention

[0006] In view of the above problems, the present invention provides a combined tool and processing method for machining a small-diameter inner hole with a large depth annular groove, which is used to overcome the above problems or at least partially solve the above problems. The problem that a small-diameter inner hole with a large depth annular groove of an energetic material cannot be machined at present is solved, and the invention can also be extended to the machining of annular grooves of other non-metallic materials.

[0007] The present invention provides the following scheme:

[0008] A combined tool for machining a small-diameter inner hole with a large-depth annular groove, comprising:

[0009] A first tool, the first tool being a double straight-edged tool, comprising two parallel cutting edges, with a cutting edge width of 13.5 mm, a spacing of 11 mm, and a total width of 38 mm;

[0010] A second tool, the second tool being a single straight-edged tool with a cutting edge width of 13 mm;

[0011] A third tool, wherein the third tool is a double straight-edged tool with arc side edges;

[0012] A fourth tool, the fourth tool is an arc-edged tool, the top arc radius is equal to the top radius of the ring groove, and the cutting edge width is 24 mm;

[0013] Among them, the first tool is used to realize the straight groove section processing of the small diameter inner hole and large depth annular groove, the first tool, the second tool, and the third tool are used in combination to realize the first arc section processing of the small diameter inner hole and large depth annular groove, and the fourth tool is used to realize the second arc section processing of the small diameter inner hole and large depth annular groove.

[0014] Preferably: the rake angle γ0 of the first tool, the second tool, the third tool and the fourth tool is 50° to 60°, the back angle a0 is 10° to 15°, and the main deflection angle K r =90°, secondary deflection angle K r '=3°~5°, the back angle a0'=3°~5°, and the radius of the chip groove bottom is 2 mm.

[0015] Preferably: the first tool, the second tool, the third tool and the fourth tool are all positioned through the rectangular grooves at the bottom, and are fixed to the tool handle by two countersunk screws respectively.

[0016] A method for machining a small-diameter inner hole with a large-depth annular groove, comprising:

[0017] The first tool is used to process the straight groove section of the small-diameter inner hole with a large-depth annular groove. The left and right parts are processed alternately during the processing. The maximum processing depth of a single tool is 5.5 mm.

[0018] The first tool and the second tool described in any one of claims 1 to 3 are used to perform linear processing alternately, and the maximum processing depth of a single tool is 5.5 mm. After a single processing, the tool bar is withdrawn and the tool is replaced; the third tool is used to perform left and right arc processing respectively, so as to complete the processing of the first arc segment of the small-diameter inner hole and large-depth annular groove;

[0019] The fourth tool is used to first perform straight line machining to the groove bottom radius R130 mm, and then perform left and right arc machining respectively, so as to complete the machining of the second arc segment of the small diameter inner hole and large depth annular groove.

[0020] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0021] The embodiment of the present application provides a combined tool and processing method for machining a small-diameter inner hole with a large depth annular groove, which effectively solves the problems of excessive cutting force and difficult chip removal in the current machining process of a small-diameter inner hole with a large depth annular groove, avoids the problem of severe tool bar vibration caused by excessive cutting force during the turning process of energetic material forming, and at the same time avoids problems such as chips being blocked near the cutting edge causing tool damage and causing accidental ignition during machining, making it possible to form a small-diameter inner hole with a large depth annular groove of energetic materials, thereby improving the machining quality and the safety of the machining process.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic structural diagram of a first tool provided by an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a second tool provided by an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of a third tool provided by an embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of a fourth tool provided by an embodiment of the present invention;

[0028] Figure 5 is a side view of a cutting edge provided by an embodiment of the present invention;

[0029] Figure 6 is a top view of a cutting edge provided by an embodiment of the present invention;

[0030] Figure 7 is a rear view of a second tool provided by an embodiment of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the left-right alternating processing process of the first tool and the straight groove section formed provided by an embodiment of the present invention;

[0032] Fig. 9is a schematic diagram of alternately processing a first arc segment by a first tool and a second tool provided by an embodiment of the present invention;

[0033] Fig.10 is a schematic diagram of the first tool and the second tool provided in an embodiment of the present invention after alternate processing is completed;

[0034] Fig.11 is a schematic diagram of a process of machining a first arc segment by a third tool and the formed first arc segment provided by an embodiment of the present invention;

[0035] Fig.12 is a schematic diagram of a fourth tool provided in an embodiment of the present invention performing straight line processing and processing a second arc segment;

[0036] Fig.13 It is a schematic diagram of the second arc segment after processing is completed provided by an embodiment of the present invention.

[0037] In the figure: a first tool 1, a second tool 2, a third tool 3, and a fourth tool 4. DETAILED DESCRIPTION

[0038] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0039] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , is a combined tool for machining a small-diameter inner hole with a large-depth annular groove provided by an embodiment of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the combined tool may include:

[0040] A first tool 1, wherein the first tool 1 is a double straight-edge tool, comprising two parallel cutting edges, with a cutting edge width of 13.5 mm, a spacing of 11 mm, and a total width of 38 mm;

[0041] A second tool 2, wherein the second tool 2 is a single straight-edged tool with a cutting edge width of 13 mm;

[0042] A third tool 3, wherein the third tool 3 is a double straight-edged tool with arc side edges;

[0043] A fourth tool 4, wherein the fourth tool 4 is an arc-edged tool, the top arc radius is equal to the top radius of the annular groove, and the cutting edge width is 24 mm;

[0044] Among them, the first tool 1 is used to realize the straight groove section processing of the small diameter inner hole and large depth annular groove, the first tool 1, the second tool 2, and the third tool 3 are used in combination to realize the first arc section processing of the small diameter inner hole and large depth annular groove, and the fourth tool 4 is used to realize the second arc section processing of the small diameter inner hole and large depth annular groove.

[0045] The embodiment of the present application provides a combination tool suitable for machining a deep annular groove in a small diameter inner hole of an energetic material, including four kinds of tools. The combination of the four kinds of tools can realize machining a deep annular groove with a circular arc top in a small diameter inner hole, and the magnitude of the cutting force can be limited during the machining process, while ensuring a smooth machining surface and smooth chip removal.

[0046] In order to further improve the sharpness of the cutting edge, the embodiment of the present application can also provide the first tool 1, the second tool 2, the third tool 3 and the fourth tool 4 with a rake angle γ0=50°~60°, a back angle a0=10°~15°, and a main deflection angle K r =90°, secondary deflection angle K r '=3°~5°, the back angle a0'=3°~5°, and the radius of the chip groove bottom is 2 mm.

[0047] In order to facilitate the installation of the tool and the tool handle, the embodiment of the present application can provide that the first tool 1, the second tool 2, the third tool 3 and the fourth tool 4 are all positioned through the rectangular grooves at the bottom, and are fixed to the tool handle by two countersunk screws respectively.

[0048] The embodiment of the present application can also provide a method for machining a small-diameter inner hole with a large-depth annular groove, comprising:

[0049] The first tool 1 is used to process the straight groove section of the annular groove with a small diameter inner hole and a large depth. The left and right parts are processed alternately during the processing. The maximum processing depth of a single tool is 5.5 mm.

[0050] The first tool 1 and the second tool 2 are used to perform linear processing alternately, and the maximum processing depth of a single tool is 5.5 mm. When a single processing is completed, the tool bar is withdrawn and the tool is replaced; the third tool 3 is used to perform left and right arc processing respectively, so as to complete the processing of the first arc segment of the small-diameter inner hole and large-depth annular groove;

[0051] The fourth tool 4 is used to firstly perform straight line machining to the groove bottom radius R130 mm, and then perform left and right arc machining respectively, so as to complete the machining of the second arc segment of the small diameter inner hole and large depth annular groove.

[0052] The combined tool and processing method provided by the present application are introduced in detail below.

[0053] The combination tool includes 4 tools, which can be used to process annular grooves with a groove width of 50mm. The first tool 1 is a double straight-edge tool, which includes two parallel cutting edges with a cutting edge width of 13.5mm, an interval of 11mm, and a total width of 38mm. The second tool 2 is a single straight-edge tool with a cutting edge width of 13mm. The third tool 3 is a double straight-edge tool with arc side cutting edges. On the basis of the first tool 1, two arc corners and side cutting edges are added. It has a good finishing effect when processing the arc top, and the processing surface is smooth. The fourth tool 4 is an arc-edge tool, the top arc radius is equal to the top radius of the annular groove, and the cutting edge width is 24mm.

[0054] Tool rake angle γ0 = 50° ~ 60°, back angle a0 = 10° ~ 15°, main deflection angle K r =90°, secondary deflection angle K r '=3°~5°, the back angle a0'=3°~5°, the radius of the chip groove bottom is 2mm. The tool edge is sharp, which reduces the cutting force, and the chip groove radius is large, which reduces the resistance of the chip rolling process.

[0055] The tool is positioned through the rectangular groove at the bottom and fixed to the tool handle by two countersunk screws. It is easy to operate and can realize quick tool replacement. The tool angle design can realize non-metallic cutting processing such as energetic materials, effectively reduce cutting force and improve cutting quality. The large-diameter chip groove structure design can effectively reduce chip resistance. The combined processing technology of 4 tools greatly reduces the tool height and cutting force, ensuring the realization of deep ring groove cutting. At the same time, the chip width is reduced, which is conducive to timely removal of chips and ensures processing safety.

[0056] The ring groove processing technology includes 1 section straight groove processing and 2 sections arc groove processing.

[0057] 1. Straight groove processing.

[0058] The tool is the first tool 1. Alternate processing is performed left and right. The maximum processing depth of a single tool is 5.5mm. The cross section after processing is as follows Figure 8 shown.

[0059] 2. Processing of the first arc segment.

[0060] The cutting tools include the first cutting tool 1 + the second cutting tool 2 + the third cutting tool 3. Fig. 9 As shown, the first tool 1 and the second tool 2 are alternately processed in a straight line. The maximum processing depth of a single tool is 5.5mm. After a single processing, the tool bar is removed and the tool is replaced. The cross section after processing is as follows Fig.10 As shown. The third tool 3 respectively moves along the left and right arc lines for processing, and the cross section after processing is as follows Fig.11 shown.

[0061] 3. Processing of the second arc segment.

[0062] The tool adopts the fourth tool 4. Fig.12 The fourth tool shown in the figure first moves in a straight line to the groove bottom radius R130mm, and then moves in the left and right arc lines respectively. After processing, the cross section is as follows Fig.13 shown.

[0063] In summary, the combined tool for machining small-diameter inner hole and large-depth ring grooves proposed in this application effectively solves the current problems of excessive cutting force and difficult chip removal in the machining of small-diameter inner hole and large-depth ring grooves, avoids the problem of severe tool bar vibration caused by excessive cutting force during the turning process of energetic material forming, and at the same time avoids problems such as chips being blocked near the cutting edge causing tool damage and causing accidental ignition during machining, making it possible to form small-diameter inner hole and large-depth ring grooves of energetic materials, thereby improving the machining quality and the safety of the machining process.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0065] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0066] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A combined tool for machining a small-diameter inner hole with a large-depth annular groove, characterized in that: include: A first tool, the first tool being a double straight-edged tool, comprising two parallel cutting edges, with a cutting edge width of 13.5 mm, a spacing of 11 mm, and a total width of 38 mm; A second tool, the second tool being a single straight-edged tool with a cutting edge width of 13 mm; A third tool, wherein the third tool is a double straight-edged tool with arc side edges; A fourth tool, the fourth tool is an arc-edged tool, the top arc radius is equal to the top radius of the ring groove, and the cutting edge width is 24 mm; Among them, the first tool is used to realize the straight groove section processing of the small diameter inner hole and large depth annular groove, the first tool, the second tool, and the third tool are used in combination to realize the first arc section processing of the small diameter inner hole and large depth annular groove, and the fourth tool is used to realize the second arc section processing of the small diameter inner hole and large depth annular groove.

2. The combined tool for machining a small-diameter inner hole with a large-depth annular groove according to claim 1, characterized in that: The rake angle γ0 of the first tool, the second tool, the third tool and the fourth tool is 50° to 60°, the back angle a0 is 10° to 15°, and the main deflection angle K r =90°, secondary deflection angle K r '=3°~5°, the back angle a0'=3°~5°, and the radius of the chip groove bottom is 2 mm.

3. The combined tool for machining a small-diameter inner hole with a large-depth annular groove according to claim 1, characterized in that: The first tool, the second tool, the third tool and the fourth tool are all positioned through the rectangular grooves at the bottom, and are fixed to the tool handle by two countersunk screws respectively.

4. A method for machining a small-diameter inner hole with a large-depth annular groove, characterized in that: include: The first tool as claimed in any one of claims 1 to 3 is used to process the straight groove section of the annular groove with a small diameter inner hole and a large depth, and the left and right parts are processed alternately during the processing, and the maximum processing depth of a single tool at a time is 5.5 mm; The first tool and the second tool described in any one of claims 1 to 3 are used to perform straight-line processing alternately, and the maximum processing depth of a single tool is 5.5 mm. After a single processing, the tool bar is withdrawn and the tool is replaced; the third tool described in any one of claims 1 to 3 is used to perform left and right arc processing respectively, so as to complete the processing of the first arc segment of the small-diameter inner hole and large-depth annular groove; The fourth tool described in any one of claims 1 to 3 is used to first perform straight line processing to the groove bottom radius R130 mm, and then perform left and right arc processing respectively, so as to complete the processing of the second arc segment of the small diameter inner hole and large depth annular groove.

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