Spring expanding and shaping device

Abstract

The utility model discloses a spring expanding and shaping device which comprises an expanding mandrel (2) and a sleeve (3). The sleeve (3) is sleeved outside the expansion mandrel (2) and can move up and down, the upper end of the expansion mandrel (2) is conical, the lower end of the expansion mandrel (2) is cylindrical, a plurality of positioning grooves (4) are formed in the side face of the expansion mandrel (2) at equal intervals, and positioning heads (5) are arranged in the sleeve (3) at equal intervals and clamped into the positioning grooves (4). The spring is prevented from rebounding upwards, labor is saved, machining time is short, and use is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of springs, and in particular relates to a spring expansion and shaping device. Background Art

[0002] During the production process, a certain type of spring needs to be expanded and shaped to a certain size, and the expanded and shaped spring must meet certain shape tolerance requirements such as roundness and flatness. The existing technology is to clamp a conical expansion head with a small top and a large bottom on a vise, manually use pliers to hold one end of the spring, and tap the pliers to make the spring move and gradually expand. The inner diameter of the spring moves from small to large. Since elastic force is generated when the spring is tapped, the pliers need to be pressed down to prevent the spring from rebounding upwards, which is laborious, and the spring moves slowly when expanding, the processing time is long, it is inconvenient to use, and the spring processing quality is poor. Summary of the invention

[0003] The utility model aims to overcome the above-mentioned disadvantages and provide a spring expansion and shaping device which prevents the spring from rebounding upward, saves effort, shortens the processing time, is easy to use and improves the spring processing quality.

[0004] The utility model discloses a spring expansion and shaping device, which comprises an expansion mandrel and a sleeve, and is characterized in that the sleeve is sleeved outside the expansion mandrel and can move up and down.

[0005] The upper end of the expansion mandrel is conical, the lower end is cylindrical, and a plurality of positioning grooves are equidistantly arranged on the side surface.

[0006] Positioning heads are equidistantly arranged in the sleeve and are inserted into the positioning grooves.

[0007] The thread arranged at the lower end of the expansion mandrel is screwed into the base.

[0008] Compared with the prior art, the utility model has obvious beneficial effects; it can be known from the above technical scheme that the sleeve can be moved up and down by sleeved outside the expansion mandrel. The spring is sleeved on the small end of the expansion mandrel cone, and then the positioning head of the sleeve is clamped into the positioning groove of the expansion mandrel, so that the lower end surface of the sleeve is pressed on the spring, and pressure is applied to the upper end surface of the sleeve by the pressure device to push the sleeve downward, and the sleeve pushes the spring to move from the small end to the large end along the cone of the expansion mandrel, forcing the spring to expand. The spring is pushed through the large end of the expansion mandrel cone to the middle large cylinder, and the spring has expanded to a size slightly larger than the required size. The spring is continued to move downward through the large cylinder in the middle of the expansion mandrel cone to the lower small cylinder, and the spring rebounds and shrinks, and the required size is reached in the free state, and the expansion and shaping of the spring is completed. After a certain number of springs are processed, the thread is unscrewed to separate the base from the expansion mandrel, and the processed spring can be taken out. Then the thread of the expansion mandrel is screwed into the base, and the expansion and shaping of the spring can be repeated. The spring is prevented from rebounding upward, which saves labor, shortens processing time and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 It is a partial cross-sectional view of the expansion mandrel of the utility model;

[0011] Figure 3 It is a left side view of the expansion mandrel of the utility model;

[0012] Figure 4 It is a right side view of the sleeve of the utility model;

[0013] Figure 5 It is a partial cross-sectional view of the sleeve of the utility model;

[0014] Figure 6 It is a usage state diagram of the utility model;

[0015] Figure 7 It is a schematic diagram of the structure of the spring of the utility model before processing;

[0016] Figure 8 It is a schematic diagram of the structure of the spring of the utility model after processing.

[0017] Marking in the figure

[0018] 1. Base, 2. Expansion mandrel, 3. Sleeve, 4. Positioning groove, 5. Positioning head, 6. Spring. DETAILED DESCRIPTION

[0019] The specific implementation methods, structures, features and functions of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0020] The purpose of the utility model and the solution of its main technical problems are achieved by adopting the following technical solutions:

[0021] The utility model discloses a spring expansion and shaping device, comprising a base 1, an expansion mandrel 2, a sleeve 3, a positioning groove 4, and a positioning head 5, and is characterized in that the sleeve 3 is sleeved on the outside of the expansion mandrel 2 and can move up and down, the upper end of the expansion mandrel 2 is conical, the lower end is cylindrical, a plurality of positioning grooves 4 are equidistantly arranged on the side surface, the positioning head 5 is equidistantly arranged inside the sleeve 3, the positioning head 5 is snapped into the positioning groove 4, and the thread arranged at the lower end of the expansion mandrel 2 is screwed into the base 1.

[0022] When in use, the base 1 and the expansion mandrel 2 are connected together by threads, the base 1 is placed on the workbench of the pressure equipment, the axis of the expansion mandrel 2 is aligned with the pressure center line of the pressure equipment, the base 1 is fixed, the installation is completed, the spring 6 is sleeved on the small end of the cone of the expansion mandrel 2, and then the positioning head 5 of the sleeve 3 is inserted into the positioning groove 4 of the expansion mandrel 2, so that the lower end surface of the sleeve 3 is pressed on the spring 6, the pressure equipment is started to apply pressure to the upper end surface of the sleeve 3, pushing the sleeve 3 to move downward, and the sleeve 3 pushes the spring 6 to move along the cone of the expansion mandrel 2 from the small end to the large end, forcing the spring 6 to expand. Push the spring 6 through the large end of the cone of the expansion mandrel 2 to the large cylinder in the middle. The spring 6 has expanded to a size slightly larger than the required size. Continue to push the spring 6 downward to pass through the large cylinder in the middle of the cone of the expansion mandrel 2 to the small cylinder at the bottom. The spring 6 rebounds and shrinks, and reaches the required size in the free state. The expansion and shaping of the spring 6 is completed. After a certain number of springs 6 are completed, unscrew the thread to separate the base 1 from the expansion mandrel 2, and the processed spring 6 can be taken out. Then screw the thread of the expansion mandrel 2 into the base 1, and the expansion and shaping of the spring 6 can be repeated.

[0023] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A spring expansion and shaping device, comprising an expansion mandrel (2) and a sleeve (3), characterized in that; The sleeve (3) is sleeved on the outside of the expansion mandrel (2) and can move up and down.

2. A spring expansion and shaping device as claimed in claim 1, characterized in that; The expansion mandrel (2) has a conical upper end and a cylindrical lower end, and has a plurality of positioning grooves (4) arranged at equal intervals on the side surface.

3. A spring expansion and shaping device as claimed in claim 1, characterized in that; Positioning heads (5) are arranged at equal intervals in the sleeve (3), and the positioning heads (5) are inserted into the positioning grooves (4).

4. A spring expansion and shaping device as claimed in claim 1, characterized in that; The thread provided at the lower end of the expansion mandrel (2) is screwed into the base (1).

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