Universal winding device for multi-shape special-shaped springs

Abstract

The invention discloses a universal winding device and method for multi-shape special-shaped springs, and belongs to the technical field of machining. The device comprises a grooved mandrel and a rotary wrench. Three angle limiting grooves are formed in the side wall of the grooved mandrel, and a first positioning pin and a second positioning pin are arranged at the two ends of the grooved mandrel. One end of the rotary wrench is provided with a sleeve hole sleeved and matched with the positioning pin, a third positioning pin is arranged adjacent to the sleeve hole, and the distance between the sleeve hole and the third positioning pin is equal to the diameter of the steel wire. The method comprises the steps that the mandrel is sleeved with the spring body, an end steel wire is arranged between the positioning pin and the third positioning pin through a wrench, the wrench is rotated to enable the end to be clamped into the selecting groove, and finally cutting and grinding are conducted. The universal, accurate and efficient winding of springs with various end angles through one tool is achieved, and the problems that a traditional machining period is long, cost is high, and quality is unstable are solved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a universal winding device for multi-shaped irregular springs. Background Technology

[0002] Non-standard, irregularly shaped springs (such as helical springs whose ends require a specific angle of bending) are widely used in mechanical products. These springs are complex in shape, and the bending at both ends requires precise dimensions and form, making them difficult to manufacture.

[0003] Currently, the processing of such irregularly shaped springs generally suffers from technical problems such as long production cycles, inability to flexibly respond to production schedule demands, high processing costs, poor economic benefits, difficulty in effectively monitoring and controlling the processing process and quality, and insufficient product quality stability.

[0004] Therefore, there is an urgent need for a device and method that can efficiently and accurately complete the winding and molding of various irregularly shaped spring ends in order to solve the problems of cycle, cost and quality control. Summary of the Invention

[0005] This invention provides a universal winding device for irregularly shaped springs of various shapes, which solves the technical problems of long processing cycle, high cost, uncontrollable quality, and difficulty in accurately and efficiently forming the bending angle of the spring ends in the prior art.

[0006] On one hand, the present invention provides a universal winding device for multi-shaped irregular springs, comprising:

[0007] A grooved mandrel is used to sleeve a spring body. Three angle-limiting grooves are distributed circumferentially on its side wall, and a first positioning pin and a second positioning pin are respectively provided on its two end faces.

[0008] A rotary wrench includes a wrench body, one end of which is provided with a sleeve hole for engaging with a first or second locating pin, and a third locating pin is provided near the sleeve hole; the diameter of the sleeve hole is adapted to the diameter of the first locating pin, and the distance between the sleeve hole and the third locating pin is equal to the diameter of the spring steel wire to be wound.

[0009] According to the present invention, a universal winding device for multi-shaped irregular springs is provided, wherein the end of the rotary wrench away from the third positioning pin has a through hole for inserting an auxiliary tool to apply torque.

[0010] According to the present invention, a universal winding device for multi-shaped irregular springs is provided, wherein the grooved mandrel further includes an upper stop, a mandrel body and a lower stop arranged coaxially, and the three angle-defining grooves are provided on the side wall of the mandrel body.

[0011] According to the present invention, a universal winding device for multi-shaped irregular springs is provided, wherein the angle-limiting groove is a square groove recessed radially along the mandrel body.

[0012] According to the present invention, a universal winding device for multi-shaped irregular springs is provided, wherein the three angle-defined grooves are positioned differently in the circumferential direction of the mandrel body, respectively corresponding to three different bending angles of the spring ends.

[0013] On the other hand, the present invention provides a method for winding an irregularly shaped spring, including the step of sequentially bending and shaping both ends of the spring, wherein bending and shaping at any end includes:

[0014] (1) A steel wire piece with a spring body wound around it is sleeved on the grooved mandrel. One end of the steel wire piece is reserved. The end is located at the end of the grooved mandrel where the first positioning pin or the second positioning pin is provided.

[0015] (2) Fit the socket of the rotary wrench onto the positioning pin at the end, and place the end portion between the positioning pin and the third positioning pin of the rotary wrench.

[0016] (3) Rotate the rotary wrench to bend the end portion until it is engaged in a selected angle-limiting groove;

[0017] (4) The end portion after bending and shaping is cut off and polished.

[0018] According to a method for winding irregular springs provided by the present invention, in step (3), different angles are selected to define the groove as the bending endpoint, so as to wind irregular springs with different end angles.

[0019] According to a method for winding an irregularly shaped spring provided by the present invention, the step of bending and shaping the two ends of the spring in sequence is as follows: first, the bending and shaping of one end is completed, and then the bending and shaping of the other end is performed.

[0020] According to a method for winding an irregularly shaped spring provided by the present invention, when bending and shaping the other end, a locating pin at the other end of the grooved mandrel is used in conjunction with a rotary wrench.

[0021] According to a method for winding an irregularly shaped spring provided by the present invention, the step of bending and shaping the two ends of the spring in sequence is as follows: using two rotary wrenches, simultaneously fitted onto the positioning pins at both ends of the grooved mandrel, to simultaneously perform bending and shaping operations on the two ends of the spring.

[0022] The universal winding device for multi-shaped irregular springs provided by this invention has the following advantages compared with the prior art:

[0023] (1) This invention transforms the traditionally complex bending process of irregularly shaped spring ends—a task requiring complex fitter skills—into a standardized, semi-automated operation guided by specialized tooling by using a grooved mandrel with three angle-defined grooves and a rotary wrench with a specific clamping structure. This enables workshops to autonomously and quickly complete the processing of such springs, fundamentally solving the core problems of long processing cycles, inflexible production, and uncontrollable quality, thus achieving autonomous control over the processing and quality.

[0024] (2) This invention integrates the forming functions of multiple end angles into a grooved mandrel and uses a rotary wrench that is compatible with the positioning pins at both ends of the mandrel, thus realizing a set of tooling for the universal winding of springs of various shapes. This solves the problems of high cost and complicated management of designing and manufacturing special molds for springs of different angles, achieving the effect of "one shaft with multiple functions" and significantly improving the utilization rate and economy of tooling.

[0025] (3) In the design of the rotary wrench of the present invention, the distance between the sleeve hole and the third positioning pin is precisely set to be equal to the diameter of the steel wire. This key dimensional feature allows the wrench to automatically form a precise clamping gap that matches the diameter of the steel wire when it is placed on the mandrel positioning pin, ensuring that the steel wire is stably constrained, does not slip, and does not twist during the bending process. This effectively solves the technical problems of inaccurate end angle, inconsistent shape, and unstable quality during manual bending, and ensures the high precision and high consistency of the product.

[0026] (4) The grooved mandrel of the present invention adopts a structure with symmetrical positioning pins and retaining edges at both ends. This design allows the second end to be wound directly using the positioning pin at the other end after one end of the spring has been wound, without having to remove the spring from the mandrel and flip it over. It can even be operated simultaneously using two wrenches. This greatly simplifies the operation process, reduces the number of clamping operations and auxiliary time, thereby significantly improving the overall processing efficiency.

[0027] (5) The present invention has a through hole at the force-applying end of the rotary wrench, which can be used to insert auxiliary tools to increase the lever arm when needed. This detailed design solves the practical problem that manual rotation may be insufficient or laborious when bending thicker steel wires or pursuing higher operating efficiency, improves the practicality and ergonomics of the device, and makes operation more labor-saving and convenient.

[0028] (6) The device of the present invention has a simple structure, mainly consisting of a grooved mandrel and a rotating wrench. It is easy to manufacture, inexpensive, and easy to popularize and promote. By breaking down the complex molding process into two simple actions, "mandrel positioning" and "wrench rotation", the dependence on the skill level of the operator is reduced. Ordinary workers can master it after a short training, which is conducive to quickly forming a stable production capacity. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a front view of a schematic diagram of the grooved mandrel of a universal winding device for multi-shaped irregular springs provided in an embodiment of the present invention;

[0031] Figure 2 This is a side view of a grooved mandrel, which is a structural schematic diagram of a universal winding device for multi-shaped irregular springs provided in an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the structure of a rotary wrench for a universal winding device for multi-shaped irregular springs provided in an embodiment of the present invention.

[0033] Figure label:

[0034] 100. Grooved mandrel; 101. Upper stop; 102. Mandrel body; 103. Lower stop; 104. Angle limiting groove; 105. First locating pin; 106. Second locating pin; 200. Rotary wrench; 201. Wrench body; 202. Sleeve hole; 203. Third locating pin; 204. Through hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0036] The following is combined with Figures 1-3 This invention describes a universal winding device for multi-shaped irregular springs.

[0037] Figure 1 This is a front view of the structural schematic diagram of the grooved mandrel provided in the embodiment of the present invention. Figure 2 This is a side view of the structural schematic diagram of the grooved mandrel provided in an embodiment of the present invention.

[0038] like Figure 1 and Figure 2As shown, the grooved mandrel 100 provided in this embodiment of the invention is cylindrical in shape and is used to support and position the spring body at the end to be wound. It has an upper stop 101, a mandrel body 102, and a lower stop 103 coaxially arranged from top to bottom. The upper stop 101 and the lower stop 103 form limits at both ends of the mandrel body 102, used to block the spring body sleeved on the mandrel body 102, preventing axial movement and outward rebound of the steel wire.

[0039] On the side wall of the mandrel body 102, three angle-limiting grooves 104 are distributed circumferentially. In this preferred embodiment, the angle-limiting grooves 104 are square grooves recessed radially inward along the mandrel body 102. The starting positions (i.e., groove orientations) of the three square grooves in the circumferential direction of the mandrel body 102 are different. In a preferred embodiment of the invention, they are arranged at intervals of 90°, 120°, 150°, or other specific angles, respectively, to limit the bending of the spring end into three different preset angles (e.g., 90°, 135°, 180°, etc.). The depth and width of each groove 104 are slightly larger than the diameter of the spring wire to ensure that the bent end can smoothly engage and disengage.

[0040] A first locating pin 105 and a second locating pin 106 are respectively provided on the end faces of both ends of the mandrel body 102. The first locating pin 105 and the second locating pin 106 are preferably cylindrical pins of the same diameter. In a preferred embodiment of the invention, the diameter of both the first locating pin 105 and the second locating pin 106 is 5 mm. They serve as rotation references for engaging with a rotary wrench.

[0041] Figure 3 This is a schematic diagram of the rotary wrench provided in an embodiment of the present invention.

[0042] like Figure 3 As shown, the rotary wrench 200 provided in this embodiment of the invention includes a cylindrical wrench body 201. At one end (operating end) of the wrench body 201, a sleeve hole 202 is provided. The diameter of this sleeve hole 202 is precisely matched with the diameter of the first locating pin 105 (or the second locating pin 106) on the grooved spindle 100, which is also 5mm, allowing the sleeve hole 202 to be tightly fitted onto the locating pin, forming a rotatable fulcrum.

[0043] A third locating pin 203 is fixedly disposed on the wrench body 201 adjacent to the sleeve hole 202. The distance L between the third locating pin 203 and the sleeve hole 202 is precisely set to be equal to the diameter d of the steel wire used to wind the irregularly shaped spring. In a preferred embodiment of the invention, if the diameter of the spring steel wire is 2mm, then the distance L = 2mm; if the diameter of the steel wire is 3mm, then the distance L = 3mm. This design ensures that when the sleeve hole 202 is fitted onto the locating pin, the end steel wire of the spring can be stably constrained between the outer cylindrical surface of the locating pin (from the mandrel) and the outer cylindrical surface of the third locating pin 203, and will not slip or shift during rotational bending. In a preferred embodiment of the invention, the diameter of the third locating pin 203 is 5mm and the length is 4mm to ensure sufficient structural strength.

[0044] A through hole 204 is provided at the other end of the wrench body 201 away from the third locating pin 203 (the hand-held end or the force-applying end). In a preferred embodiment of the invention, the diameter of the through hole 204 is 6 mm. Its function is to allow a rod-shaped auxiliary tool (such as a hex wrench, steel rod, etc.) to be inserted into the through hole 204 when it is necessary to bend a thicker steel wire or obtain greater torque, thereby increasing the lever arm and facilitating the operator to apply force and rotate the wrench.

[0045] Based on the above-mentioned universal winding device for multi-shaped irregular springs, the present invention also provides a winding method for irregular springs, which specifically includes the following steps:

[0046] According to the drawing requirements, the spring steel wire is wound into the required cylindrical helical spring body on a lathe or a special spring winding machine. After winding, it is cut from the wire coil, leaving a straight wire section of about 40mm at one end as the end part to be formed.

[0047] Place the spring body onto the mandrel body 102 of the grooved mandrel 100. Position the end with the pre-drilled end upwards, so that the end portion is located on one side of the upper stop 101.

[0048] Take a rotary wrench 200 and fit its socket 202 onto the first locating pin 105 of the grooved spindle 100 from top to bottom.

[0049] Place the end wire of the spring in the gap between the first locating pin 105 and the third locating pin 203 of the rotary wrench 200.

[0050] According to the end angle required by the drawing, select the corresponding angle limiting groove 104 as the bending endpoint. Rotate the wrench body 201 by hand (or by inserting an auxiliary tool into the through hole 204 to apply force), causing the end wire to rotate and bend around the first positioning pin 105 until the end wire is embedded in the selected angle limiting groove 104.

[0051] While maintaining the bent position, use pliers to cut off the excess wire end along the reserved length, and smooth out any burrs at the cut with a file or sandpaper. Once finished, remove the rotary wrench 200 from the first locating pin 105.

[0052] There is no need to remove the spring from the slotted spindle 100 and flip it over. The spring body remains in its original position.

[0053] Adjust the straight wire section reserved at the other end of the spring (the end that was not previously treated) upwards so that it is located on the side of the lower stop 103.

[0054] Take the same or another rotary wrench 200 and fit its sleeve hole 202 onto the second locating pin 106 of the grooved spindle 100 from bottom to top.

[0055] Repeat the "clamping and positioning", "rotation and bending" (select the groove according to the requirements of the end drawing) and "post-processing" operations to complete the winding and shaping of the second end.

[0056] In actual operation, two rotary wrenches 200 can also be used, which are respectively fitted onto the first positioning pin 105 and the second positioning pin 106. Two operators can work together or one operator can perform bending operations on both ends of the spring simultaneously or quickly and continuously, thereby further improving processing efficiency.

[0057] With the above-mentioned device and method, only one set of tooling is needed to efficiently and accurately complete the winding of various irregular springs with different end bending angle requirements, realizing the factory's independent, flexible and controllable processing capability.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A universal winding device for various irregularly shaped springs, characterized in that, include: A grooved mandrel is used to sleeve a spring body. Three angle-limiting grooves are distributed circumferentially on its side wall, and a first positioning pin and a second positioning pin are respectively provided on its two end faces. A rotary wrench includes a wrench body, one end of which is provided with a sleeve hole for engaging with a first or second locating pin, and a third locating pin is provided near the sleeve hole; the diameter of the sleeve hole is adapted to the diameter of the first locating pin, and the distance between the sleeve hole and the third locating pin is equal to the diameter of the spring steel wire to be wound.

2. The universal winding device for multi-shaped irregular springs according to claim 1, characterized in that, The end of the rotary wrench furthest from the third locating pin has a through hole for inserting an auxiliary tool to apply torque.

3. The universal winding device for multi-shaped irregular springs according to claim 1, characterized in that, The grooved mandrel also includes an upper stop, a mandrel body, and a lower stop arranged coaxially, and the three angle-limiting grooves are provided on the side wall of the mandrel body.

4. The universal winding device for multi-shaped irregular springs according to claim 3, characterized in that, The angle-defined groove is a square groove that is recessed radially along the main body of the mandrel.

5. The universal winding device for multi-shaped irregular springs according to claim 1, characterized in that, The three angle-defined grooves are positioned differently in the circumferential direction of the spindle body, corresponding to three different bending angles of the spring ends.

6. A method for winding an irregularly shaped spring using the winding device described in any one of claims 1 to 5, characterized in that, This includes the step of sequentially bending and shaping both ends of the spring, wherein bending and shaping at any end includes: (1) A steel wire piece with a spring body wound around it is sleeved on the grooved mandrel. One end of the steel wire piece is reserved. The end is located at the end of the grooved mandrel where the first positioning pin or the second positioning pin is provided. (2) Fit the socket of the rotary wrench onto the positioning pin at the end, and place the end portion between the positioning pin and the third positioning pin of the rotary wrench. (3) Rotate the rotary wrench to bend the end portion until it is engaged in a selected angle-limiting groove; (4) The end portion after bending and shaping is cut off and polished.

7. The method for winding irregularly shaped springs according to claim 6, characterized in that, In step (3), different angles are selected to define the groove as the bending endpoint, so as to wind irregular springs with different end angles.

8. The method for winding irregularly shaped springs according to claim 6, characterized in that, The steps for bending and shaping the two ends of the spring in sequence are as follows: first, bend and shape one end, and then bend and shape the other end.

9. The method for winding irregularly shaped springs according to claim 8, characterized in that, When bending and shaping the other end, the locating pin at the other end of the grooved mandrel is used in conjunction with the rotary wrench.

10. The method for winding irregularly shaped springs according to claim 6, characterized in that, The step of bending and shaping the two ends of the spring in sequence is as follows: using two rotary wrenches, simultaneously fitted onto the locating pins at both ends of the grooved mandrel, to simultaneously bend and shape the two ends of the spring.

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