Stripping type spring chuck

Abstract

The utility model provides a crossover type collet chuck which comprises a three-jaw clamping piece, a power pull rod, an inner cone lining and an outer sleeve, the three-jaw clamping piece is installed at the head end of the power pull rod through a positioning bolt, and the power pull rod is externally connected with a machine tool equipment main shaft so as to provide power to push / pull the power pull rod to achieve the bounce-off / clamping action of the three-jaw clamping piece on a part to be machined. The inner conical bushing is embedded into the outer sleeve and is axially and tightly matched with the outer sleeve; and the power pull rod penetrates through the inner conical bushing and the outer sleeve and is axially and tightly matched with the inner conical bushing and the outer sleeve. The high-precision clamping device has the advantages that high-precision clamping of the countersunk head fastener is achieved on a CNC numerical control machine tool quickly and conveniently, the machining process design requirement of the high-precision countersunk head fastener can be met, and the industrialization capacity of the high-precision fastener with a countersunk head structure is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of firmware assembly, in particular to a leaping spring chuck. Background Art

[0002] In the field of aerospace, with the continuous optimization of aircraft structural design, such as the widespread application of wing-body fusion technology and long-life design concepts, the requirements for connection technology have also expanded from single static strength considerations to fatigue strength, fatigue life, stealth performance, sealing, and process convenience. In order to ensure the integrity of the aircraft structure and reduce the number of drilling holes increased by reserving processing channels and space, structural connections tend to adopt single-sided connection methods. Therefore, high-precision, high-strength countersunk single-sided connection fasteners are widely used in aircraft manufacturing.

[0003] Most of these fasteners are made of high-performance materials such as titanium alloys and high-temperature alloys. The forging process is complex and the molding is difficult. After forging, high-precision and high-rigidity CNC equipment is required for processing. However, when processing countersunk fasteners, traditional CNC equipment often needs to be clamped with the help of tooling due to the limited opening range of the universal spring chuck (generally no more than 1 mm). This is not only low in precision and efficiency, but also not suitable for automated production, resulting in a high scrap rate and a series of problems. Utility Model Content

[0004] In view of this, the utility model aims to propose a leaping spring chuck to realize fast and convenient high-precision clamping of countersunk fasteners on CNC machine tools, which can meet the processing design requirements of high-precision countersunk fasteners and improve the industrialization capacity of high-precision fasteners with countersunk structures.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] The utility model relates to a straddle-type spring chuck.

[0007] Furthermore, it comprises a three-jaw clamp, a power pull rod, an inner cone bushing and an outer sleeve, wherein the three-jaw clamp is installed at the head end of the power pull rod through a positioning bolt, and the power pull rod is externally connected to the main shaft of the machine tool equipment to provide power to push / pull the power pull rod to realize the opening / clamping action of the three-jaw clamp on the workpiece to be processed;

[0008] The inner cone bushing is embedded in the outer sleeve and closely matched with the outer sleeve in the axial direction; the power pull rod passes through and closely matched with the inner cone bushing and the outer sleeve in the axial direction.

[0009] Furthermore, it also includes a positioning rod and a positioning block. The positioning block is fixed inside the power pull rod. The positioning block is provided with an internal threaded hole extending therethrough. The positioning rod is provided with an external thread. The positioning rod is threadedly connected to the positioning block, and the positioning block, the positioning rod, the power pull rod, the inner conical bushing, and the outer sleeve are coaxially matched.

[0010] Furthermore, the positioning rod is fixedly connected to the workpiece to be processed, and the length processing requirement of the workpiece to be processed is met by adjusting the extension and contraction amount of the positioning rod.

[0011] Furthermore, the inner cone bushing is provided with an inner cone surface and a stopper at the cone bottom end, and the power pull rod is provided with an outer cone surface. The inner cone surface and the outer cone surface are conically matched for axial sliding of the power pull rod relative to the inner cone bushing.

[0012] Furthermore, the head end of the power pull rod is away from the inner cone bushing, and the three-claw clip is ejected;

[0013] The head end of the power pull rod is close to the inner cone bushing and is clamped by a three-claw clamp.

[0014] Furthermore, the outer sleeve is fixedly connected to the inner cone bushing via a built-in positioning pin to limit the axial rotation of the inner cone bushing.

[0015] Furthermore, a clamping method for a straddling spring chuck comprises:

[0016] T1. Slide the power pull rod to make the three-claw clamp open;

[0017] T2, insert the workpiece to be processed into the sliding power pull rod and connect it axially and fixedly to the positioning rod;

[0018] T3. Slide the power pull rod to make the three-jaw clamp clamp the workpiece to be processed.

[0019] Compared with the prior art, the leaping spring chuck described in the utility model has the following beneficial effects:

[0020] (1) The leap-type spring chuck described in the utility model has a large opening range (up to 10 mm), which enables it to adapt to parts to be processed of different sizes, greatly improving the versatility and applicability of the equipment;

[0021] (2) The three-jaw clamp of the straddle-type spring chuck described in the utility model is directly driven by a power pull rod, which can achieve more precise opening and closing control. In addition, the conical fit between the inner cone bushing and the outer sleeve, as well as the coaxial fit of each component, ensure the stability and repeatability of the overall device during operation, thereby improving the processing accuracy;

[0022] (3) The straddle-type spring chuck described in the utility model reduces the reliance on additional auxiliary positioning and clamping tools, thereby alleviating the reliance on the operating skills of the staff, making the machine tool operation more automated and simple, which not only improves productivity but also ensures the high quality and economic benefits of the processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of a front cross-sectional view and a side view of a straddling spring chuck according to an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the appearance of the positioning rod according to an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the appearance of the positioning block described in the embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of the appearance of the three-claw clamp part according to the embodiment of the utility model;

[0028] Figure 5 This is a schematic diagram of the appearance of the power pull rod according to an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the appearance of the workpiece to be processed according to the embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of a cross-sectional view (loose state) of a straddling spring chuck according to an embodiment of the utility model;

[0031] Figure 8 It is a schematic diagram of a cross-sectional view (clamped state) of the leaping spring chuck described in an embodiment of the utility model.

[0032] Description of reference numerals:

[0033] 1-three-jaw clamp; 2-power pull rod; 3-inner cone bushing; 4-outer sleeve; 5-positioning rod; 6-positioning block; 7-workpiece to be processed. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] A straddle-type spring chuck, such as Figure 1-6 As shown, it includes a three-jaw clamp 1, a power pull rod 2, an inner cone bushing 3, and an outer sleeve 4. The three-jaw clamp 1 is installed on the head end of the power pull rod 2 through a positioning bolt. The power pull rod 2 is externally connected to the main shaft of the machine tool equipment (not shown in the figure) to provide power to push / pull the power pull rod 2 to realize the three-jaw clamp 1 to open / clamp the workpiece to be processed; the inner cone bushing 3 is embedded in the outer sleeve 4 and tightly fits with it axially, and the power pull rod 2 passes through and tightly fits with the inner cone bushing 3 and the outer sleeve 4 axially. The advantage is that the design of the straddle-type spring chuck in this application enables it to have a spring-opening range of up to 10mm, which is 20 times higher than the spring-opening amount of the traditional spring chuck. For fasteners with countersunk features, after using the straddle-type spring chuck, the fastener can be directly fed from the countersunk end into the chuck to achieve high-precision positioning and clamping without the need for additional auxiliary positioning and clamping tools. This method significantly improves the clamping accuracy and processing efficiency of countersunk fasteners.

[0037] Specifically, in order to axially position the workpiece 7 to be processed, the spring chuck is further provided with a positioning rod 5 and a positioning block 6, the positioning block 6 is fixed inside the power pull rod 2, the positioning block 6 is provided with a through internal threaded hole, the positioning rod 5 is provided with an external thread, the positioning rod 5 is threadedly connected with the positioning block 6, and the positioning block 6, the positioning rod 5, the power pull rod 2, the inner cone bushing 3, and the outer sleeve 4 are coaxially matched. The positioning rod 5 is fixedly connected with the workpiece 7 to be processed, and the length processing requirements of the workpiece 7 to be processed are met by adjusting the telescopic amount of the positioning rod 5.

[0038] Specifically, the inner cone bushing 3 is provided with an inner cone surface and a stopper at the bottom of the cone, and the power pull rod 2 is provided with an outer cone surface, and the inner cone surface and the outer cone surface are conically matched, so that the power pull rod 2 can slide axially relative to the inner cone bushing 3. The angle and length of the inner cone surface of the inner cone bushing 3 determine the amount of the three-claw clamp 1 to be opened and the service life.

[0039] The working principle of the spring chuck is as follows: Figure 7 As shown, when the machine tool equipment connected to the power pull rod 2 inputs the ejection command, the head end of the power pull rod 2 moves away from the inner cone bushing 3, and the three-claw clamp 1 ejects; Figure 8 As shown, when the bed device inputs a clamping command, the head end of the power pull rod 2 approaches the inner cone bushing 3, and the three-claw clamp 1 is clamped.

[0040] Optionally, the three-jaw clamp 1 supports customization of different clamp radii, and the clamping accuracy after debugging can reach within 0.01mm. The positioning range of the positioning rod 5 is 50mm, and the positioning accuracy in the length direction is within 0.05mm. The outer sleeve 4 is fixedly connected to the inner cone bushing 3 through the built-in positioning pin to limit the axial rotation of the inner cone bushing 3, which is used to suppress the axial rotation movement of the part to be processed.

[0041] A clamping method for a straddle-type spring chuck, comprising:

[0042] T1, slide the power pull rod 2 to put the three-claw clamp 1 in the open state;

[0043] T2, insert the workpiece 7 to be processed into the sliding power pull rod 2 and axially fix it to the positioning rod 5;

[0044] T3. Slide the power pull rod 2 to make the three-jaw clamp 1 clamp the workpiece 7 to be processed.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A straddle-type spring chuck, characterized in that: It comprises a three-jaw clamp (1), a power pull rod (2), an inner cone bushing (3), and an outer sleeve (4); the three-jaw clamp (1) is mounted on the head end of the power pull rod (2) via a positioning bolt; the power pull rod (2) is externally connected to a main shaft of a machine tool to provide power to push / pull the power pull rod (2) to realize the opening / clamping action of the three-jaw clamp (1) on the workpiece to be processed; The inner cone bushing (3) is embedded in the outer sleeve (4) and tightly matched with the outer sleeve (4) in the axial direction, and the power pull rod (2) passes through and tightly matched with the inner cone bushing (3) and the outer sleeve (4) in the axial direction.

2. A straddle type spring chuck according to claim 1, characterized in that: It also includes a positioning rod (5) and a positioning block (6). The positioning block (6) is fixed inside the power pull rod (2). The positioning block (6) is provided with an internal threaded hole extending therethrough. The positioning rod (5) is provided with an external thread. The positioning rod (5) is threadedly connected to the positioning block (6). The positioning block (6), the positioning rod (5), the power pull rod (2), the inner cone bushing (3), and the outer sleeve (4) are coaxially matched.

3. A straddle type spring chuck according to claim 2, characterized in that: The positioning rod (5) is fixedly connected to the workpiece (7) to be processed, and the length processing requirement of the workpiece (7) to be processed is met by adjusting the extension and contraction amount of the positioning rod (5).

4. The straddle-type spring chuck according to claim 1, characterized in that: The inner cone bushing (3) is provided with an inner cone surface and a stopper at the bottom end of the cone, and the power pull rod (2) is provided with an outer cone surface. The inner cone surface and the outer cone surface are conically matched to allow the power pull rod (2) to slide axially relative to the inner cone bushing (3).

5. The straddle-type spring chuck according to claim 4, characterized in that: The head end of the power pull rod (2) is away from the inner cone bushing (3), and the three-claw clamp (1) pops open; The head end of the power pull rod (2) is close to the inner cone bushing (3) and is clamped by the three-claw clamp (1).

6. The straddle-type spring chuck according to claim 1, characterized in that: The outer sleeve (4) is fixedly connected to the inner cone bushing (3) via a built-in positioning pin to limit the axial rotation of the inner cone bushing (3).

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