Special clamp for production of car lamp shell

Abstract

The utility model belongs to the technical field of car lamp shell machining, and particularly relates to a special clamp for car lamp shell production, which comprises a machine tool spindle and a hydraulic cylinder, the hydraulic cylinder is connected with the machine tool spindle through a pin shaft, so that the hydraulic cylinder can do reciprocating rectilinear motion; a piston rod part of the hydraulic cylinder is locked with a thread at one end of a pull rod; the other end, far away from the hydraulic cylinder, of the pull rod is conical; the elastic expansion sleeve is movably connected to the outer portion of the pull rod in a sleeving mode, the end, away from the hydraulic cylinder, of the elastic expansion sleeve is an elastic piece, and three radial elastic grooves are formed in the elastic piece; the elastic expansion sleeve further comprises a positioning sleeve, the elastic piece is sleeved with the positioning sleeve, the elastic piece is not completely covered with the positioning sleeve, and the positioning sleeve and the boss of the elastic expansion sleeve are fixed through four bolts. The fixture is compact in structure and easy to install and use, has a good locking effect on a thin-wall workpiece, can meet the working procedures of cylindrical turning, appearance surface polishing and shaping and the like through one-time clamping, and effectively improves the machining efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of automotive lamp housing processing technology, specifically relating to a special fixture for automotive lamp housing production. Background Technology

[0002] The headlight housing has a simple structure and is a typical thin-walled aluminum alloy part, with a relatively soft material. In actual processing, the headlight housing, after initial die casting, needs to be placed on a machine tool for a series of processes such as cutting, grinding, and polishing.

[0003] Conventional machining tools use a three-jaw chuck to fix the lamp housing. Because the three-jaw chuck has strong force, thin-walled workpieces are easily deformed under clamping force and heat during processing, which will eventually damage the appearance of the lamp housing, resulting in serious flatness differences and affecting the processing quality of the lamp housing. Utility Model Content

[0004] The purpose of this utility model is to provide a special fixture for the production of automotive lamp housings, including a machine tool spindle and a hydraulic cylinder. The hydraulic cylinder and the machine tool spindle are connected by a pin, enabling the hydraulic cylinder to perform reciprocating linear motion. The piston rod of the hydraulic cylinder is threaded and locked to one end of a pull rod, and the other end of the pull rod away from the hydraulic cylinder is tapered. It also includes an elastic expansion sleeve, which is movably fitted onto the outside of the pull rod. The end of the elastic expansion sleeve away from the hydraulic cylinder is an elastic element with three radial elastic grooves. Finally, it includes a positioning sleeve, which is fitted onto the outside of the elastic element but does not completely cover it. The positioning sleeve is fixed to the boss of the elastic expansion sleeve by four bolts.

[0005] Preferably, a connecting sleeve is provided on the side of the boss of the elastic expansion sleeve away from the positioning sleeve, and the inner side of the connecting sleeve is provided with threads, which are screwed into the elastic expansion sleeve for tight connection.

[0006] Preferably, the tapered portion of the pull rod has a taper angle of 25°.

[0007] Preferably, the elastic element has an inner conical hole with a 25° angle on its inner side.

[0008] Preferably, the connecting sleeve is screwed to the machine tool spindle.

[0009] The beneficial effects of this utility model are:

[0010] By converting the original three-jaw chuck clamping method into one that uses an elastic expansion sleeve to clamp the inner diameter of the lamp housing from the inside, the arc-shaped clamping surface ensures that the clamping force on the inner diameter of the lamp housing is uniform and stable. The positioning sleeve on the outside of the elastic expansion sleeve achieves axial positioning of the lamp housing, thereby improving positioning accuracy and preventing workpiece clamping deviation. Through the pull rod connected to the hydraulic cylinder, the principle of conical expansion is used to make the elastic expansion sleeve evenly stressed, thereby improving the stability of the lamp housing clamping and effectively avoiding the impact of vibration on the lamp housing during processing.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model;

[0015] Figure 2 This is a cross-sectional view of the internal structure of an embodiment of this utility model;

[0016] Figure 3 This is a partial structural enlarged view of an embodiment of the present invention.

[0017] In the picture:

[0018] 1. Pull rod; 2. Elastic expansion sleeve; 3. Elastic element; 4. Elastic groove; 5. Positioning sleeve; 6. Connecting sleeve; 7. Inner conical hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] like Figures 1 to 3 As shown, this embodiment provides a special fixture for the production of automotive lamp housings. All fixture components are made of 45 steel with good elasticity. Specifically, it includes a conventionally used machine tool spindle and a hydraulic cylinder. The hydraulic cylinder and the machine tool spindle are connected by a pin, allowing the hydraulic cylinder to perform reciprocating linear motion. The piston rod of the hydraulic cylinder is threadedly locked to one end of the pull rod 1, causing the pull rod 1 to reciprocate under the drive of the piston rod. The other end of the pull rod 1 away from the hydraulic cylinder is tapered. It also includes an elastic expansion sleeve 2, which is movably fitted onto the outside of the pull rod 1. The end of the elastic expansion sleeve 2 away from the hydraulic cylinder is an elastic element 3, which has three radial elastic grooves 4. In the absence of force, the tapered portion of the pull rod 1 slightly protrudes from the elastic element 3. Only when the hydraulic cylinder applies a pulling force to the pull rod 1 does the tapered surfaces tension each other, and the elastic element 3 distributes a clamping force radially outward, achieving external support. The system also includes a positioning sleeve 5, which is fitted over the elastic element 3 but does not completely cover it. The positioning sleeve 5 is fixed to the boss of the elastic expansion sleeve 2 by four bolts. Considering that the small stepped surface of the elastic expansion sleeve alone is insufficient for positioning, the positioning sleeve 5 is used to achieve more precise axial positioning and also increases the machining space. A connecting sleeve 6 is provided on the side of the boss of the elastic expansion sleeve 2 away from the positioning sleeve 5. The connecting sleeve 6 has threads on its inner side and is screwed tightly to the elastic expansion sleeve 2 through the threads. The connecting sleeve 6 is screwed tightly to the machine tool spindle, ensuring a tight connection between the entire fixture and the machine tool spindle. The tapered part of the pull rod 1 has a 25° taper surface, and the elastic element 3 has a 25° inner tapered hole 7 on its inner side. The taper surfaces of the two cooperate with each other to ensure the stable expansion of the elastic element 3 after being subjected to force.

[0021] In summary, this embodiment uses the pull rod to retract, relying on the supporting elastic element 3 to apply a uniform tension force to the inner diameter of the lamp housing, and relies on the boss part of the positioning sleeve 5 as an auxiliary support to ensure stable clamping of the workpiece without damaging the surface of the workpiece, thus further improving processing efficiency.

[0022] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0023] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A special fixture for producing automotive lamp housings, comprising a machine tool spindle and a hydraulic cylinder, wherein the hydraulic cylinder and the machine tool spindle are connected by a pin, enabling the hydraulic cylinder to perform reciprocating linear motion; characterized in that: The piston rod of the hydraulic cylinder is threadedly locked to one end of the pull rod (1), and the other end of the pull rod (1) away from the hydraulic cylinder is tapered; it also includes an elastic expansion sleeve (2), which is movably sleeved on the outside of the pull rod (1), and the end of the elastic expansion sleeve (2) away from the hydraulic cylinder is an elastic element (3), which has three radial elastic grooves (4); it also includes a positioning sleeve (5), which is sleeved on the outside of the elastic element (3) and does not completely cover the elastic element (3), and the positioning sleeve (5) is fixed to the boss of the elastic expansion sleeve (2) by four bolts.

2. The special fixture for producing automotive lamp housings according to claim 1, characterized in that: A connecting sleeve (6) is provided on the side of the boss of the elastic expansion sleeve (2) away from the positioning sleeve (5). The inner side of the connecting sleeve (6) is provided with threads, and it is screwed into the elastic expansion sleeve (2) through the threads.

3. The special fixture for producing automotive lamp housings according to claim 2, characterized in that: The tapered portion of the tie rod (1) has a cone angle of 25°.

4. The special fixture for producing automotive lamp housings according to claim 3, characterized in that: The elastic element (3) has a 25° inner conical hole (7) on its inner side.

5. The special fixture for producing automotive lamp housings according to claim 4, characterized in that: The connecting sleeve (6) is connected to the machine tool spindle by a threaded connection.

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