Coil spring forming dies and spring machines

Abstract

The present invention discloses a coil spring forming die and a spring machine. The die comprises: a die base; a die core, which is arranged on the die base and has a first working wall, the first working wall includes a first end and a second end opposite to each other, a groove close to the first end is arranged on the first working wall, the groove includes a bottom wall, a first side wall and a second side wall, and the depth of the first side wall is equal to the length of the inner hook; a slider, which can be slidably connected to the die base and has a protrusion, the protrusion has a second working wall, the second working wall includes a first end and a second end opposite to each other, the slider has a first position and a second position, when the slider is located at the first position, the second end of the second working wall is misaligned with the second end of the first working wall, when the slider is located at the second position, the second end of the second working wall is aligned with the second end of the first working wall, and the distance between the first end of the second working wall and the first side wall of the groove away from the bottom wall is equal to the thickness of the wire. This scheme has the advantage of improving the coil spring forming accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of spring machines, in particular to a coil spring forming die and a spring machine. Background Art

[0002] Coil springs are generally used as power for micro-machines without using electrical energy. Most coil springs can be used to achieve automatic reset within a certain range. For example, when drilling with a benchtop drill press, press the feed handle to move the drill bit downward. After drilling the hole, once you let go, the drill bit will automatically rise back to its original position. This is because a coil spring is installed in the shaft of the handle. There are many examples of coil springs being used for reset in mechanical equipment, and they are widely used in various automatic machines, printing machines, and packaging machines.

[0003] like Figure 1 A coil spring shown includes a main body 10, and the end of the innermost circle of the main body 10 has an inner hook 110. The length of the inner hook 110 will affect the installation of the coil spring and even affect the performance of the spring. Therefore, the length of the inner hook 110 is a dimension that is focused on. In addition, whether the transition between the end section of the first circle of the spring and the beginning section of the second circle is smooth (or smooth) will affect the service life and appearance quality of the spring. Therefore, when preparing a coil spring, how to use a molding device to mold an inner hook with the required size at one time, avoid adding a shearing process to shear excess material from the inner hook, and how to improve the roundness of the transition between the inner and outer circles are problems that technicians in this field continue to work on. Summary of the invention

[0004] In order to overcome the defects in the prior art, an embodiment of the present invention provides a coil spring forming die and a spring machine, which are used to solve the above problems.

[0005] The present application embodiment discloses: a coil spring forming die, comprising:

[0006] A mold base, used for connecting with a driving mechanism;

[0007] A mold core is arranged on the mold base, the mold core has a first working wall for winding the coil spring, the first working wall includes a first end and a second end opposite to each other, the first working wall is provided with a groove close to the first end of the first working wall, the groove includes a bottom wall, a first side wall and a second side wall, the bottom wall is used to abut against the end of the wire extending into the groove, the first side wall is used to form the inner hook of the coil spring, and the depth of the first side wall is equal to the length of the inner hook;

[0008] A slider is slidably connected to the mold base, the slider has a protrusion, the protrusion has a second working wall for winding the coil spring, the second working wall includes a first end and a second end opposite to each other, the slider has a first position and a second position, when the slider is located at the first position, the second end of the second working wall is misaligned with the second end of the first working wall, when the slider is located at the second position, the second end of the second working wall is aligned with the second end of the first working wall, and the distance between the first end of the second working wall and the first side wall of the groove away from the bottom wall is equal to the thickness of the wire.

[0009] Specifically, when the sliding block is located at the first position, the first end of the second working wall is completely misaligned with the entrance of the groove.

[0010] Specifically, the mold base is provided with an inner cavity, and the sliding block is embedded in the inner cavity and is slidably connected with the inner cavity.

[0011] Specifically, the sliding block is connected to the inner wall of the inner cavity through an elastic connecting piece.

[0012] Specifically, the elastic connecting member is a spring.

[0013] Specifically, the first side wall and the second side wall of the groove are respectively parallel to the diameter of the first working wall.

[0014] Specifically, the mold core has a first connecting wall, and the protruding portion of the slider has a second connecting wall. During the sliding process of the slider, the second connecting wall is always in contact with the first connecting wall.

[0015] Specifically, a distance between the first side wall and the second side wall is equal to a thickness of the wire.

[0016] The embodiment of the present application further discloses: a spring machine, comprising a driving mechanism and a coil spring forming die as described in the embodiment, wherein the die base is mounted on the driving mechanism.

[0017] The present invention has at least the following beneficial effects:

[0018] 1. The positional relationship between the bottom wall and the first side wall of the groove on the mold core is determined according to the length of the straight section of the inner hook of the coil spring. The inner hook with precise size can be prepared through the groove, and there is no need to process the inner hook in the later process, which saves costs. Since the slider will move toward the direction of the groove under the action of the wire during the winding process, the wire can be prevented from exiting the groove when the slider moves to the groove. Therefore, when the length of the inner hook is short, there is no need to worry about the inner hook falling off from the groove.

[0019] 2. A smooth connection between the inner and outer circles of the spring is achieved through a slidable slider. Specifically, if a circular mold core is used to prepare a coil spring, since the end points of the working walls of the mold core are fixed and cannot move, the end of the innermost circle of the coil spring (that is, the starting end of the secondary inner circle) and its starting end cannot be smoothly connected. In this embodiment, the first working wall and the second working wall cooperate with each other. During the process of winding the coil spring, the second working wall can slide, that is, the first end of the second working wall can move, so as to raise the wire at the end of the innermost circle to be tangent to the outside of the wire at its starting end. In this way, the end of each circle and the starting end of the next circle can transition smoothly.

[0020] 3. The movement of the slider in this embodiment mainly depends on the force exerted on it by the wire and the elastic connector. Therefore, this mold does not require additional power equipment to drive the slider to move.

[0021] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic structural diagram of a coil spring in an embodiment of the present invention;

[0024] Figure 2 is a three-dimensional diagram of a coil spring forming die when the slider is in the first position in an embodiment of the present invention;

[0025] Figure 3 is a front view of the coil spring forming mold when the slider is in the first position in an embodiment of the present invention;

[0026] Figure 4 is a three-dimensional diagram of the coil spring forming die when the slider is in the second position in an embodiment of the present invention;

[0027] Figure 5 is a front view of the coil spring forming mold when the slider is in the second position in an embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure in which the wire material extends into the groove of the mold core in an embodiment of the present invention.

[0029] The figure markings of the above drawings are: 1. mold base; 11. inner cavity; 2. mold core; 21. first working wall; 22. groove; 221. bottom wall; 222. first side wall; 223. second side wall; 23. first connecting wall; 3. slider; 31. protrusion; 311. second working wall; 32. second connecting wall; 4. elastic connecting member; 10. main body; 110. inner hook. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, the coil spring of this embodiment includes a main body 10 and an inner hook 110 arranged at the innermost end of the main body 10, and the inner hook 110 has a straight line segment, and the straight line segment has a length. The coil spring forming mold of this embodiment is particularly advantageous when used to prepare coil springs with a very small inner hook straight line segment. Specifically, the traditional spring machine is limited by the minimum processing size. When preparing a coil spring with a very small inner hook length, the length of the inner hook is usually enlarged first, that is, when forming for the first time, the size of the inner hook is first made longer than the design size, and then the excess material of the inner hook is sheared in the subsequent process. Since the inner hook is located inside the coil spring, it is inconvenient to shear. Therefore, this method not only causes low efficiency, but also is likely to cause problems such as poor size and instability of the inner hook. The spring machine of this embodiment uses the mold of this embodiment to form an inner hook with the required size at one time, so that the production efficiency is improved and the quality of the product is guaranteed.

[0032] like Figures 2 to 5 As shown, the coil spring forming mold of this embodiment mainly includes a mold base 1, a mold core 2 arranged on the mold base 1 and a slider 3 slidably arranged on the mold base 1.

[0033] The mold base 1 is used to be connected to a driving mechanism. The driving mechanism may be a motor, and the mold base 1 may be installed on a rotating shaft of the motor.

[0034] The mold core 2 has a first working wall 21 for winding the spring, and the first working wall 21 includes a first end and a second end (with a first end and a second end) opposite to each other. Figure 3 and Figure 5For example, the first end of the first working wall 21 is equivalent to its upper end, and the second end is equivalent to its lower end). The first working wall 21 is provided with a groove 22 near its first end, and the groove 22 includes a bottom wall 221 and a first side wall 222 and a second side wall 223 that are arranged oppositely. One end of the first side wall 222 and the second side wall 223 are respectively connected to the bottom wall 221, and the other end is respectively connected to the first working wall 21. The bottom wall 221 is used to abut against the end of the wire extending into the groove 22, and the first side wall 222 is used to form the inner hook of the coil spring, and the depth of the first side wall 222 is equal to the length of the inner hook. In other words, the lengths of the two ends of the first side wall 222 are equal to the length of the inner hook. In this way, the bottom wall 221 of the groove 22 is used to limit the feeding of the wire to ensure that the length of the straight line segment of the inner hook meets the requirements. During molding, the wire is abutted against the first side wall 222 of the groove 22, and the end of the first side wall 222 connected to the first working wall 21 is bent to form an inner hook.

[0035] The slider 3 has a protrusion 31, which has a second working wall 311 for cooperating with the first working wall 21 of the mold core 2 to wind the coil spring together, and has a first end and a second end (with a first end and a second end) opposite to each other. Figure 3 and Figure 5 For example, the first end of the second working wall 311 is equivalent to its upper end, and the second end is equivalent to its lower end). During operation, the slider 3 has a first position and a second position, wherein the first position generally refers to the position of the slider 3 when the wire has not yet extended into the groove 22 of the mold core 2, and the second position generally refers to the position of the slider 3 when the wire rotates a full circle (or multiple circles) to hug the first working wall 21 of the mold core 2 and the second working wall 311 of the slider 3 during the process of winding the coil spring.

[0036] like Figure 3 As shown, when the slider 3 is located at the first position, the second end of the second working wall 311 of the protrusion 31 of the slider 3 is misaligned with the second end of the first working wall 21 of the mold core 2. More specifically, the first end and the second end of the second working wall 311 are respectively located below the first end and the second end of the first working wall 21. At this time, the opening of the groove 22 on the mold core 2 is not completely blocked, which facilitates the feeding of wire into the groove 22. Figure 5As shown, when the slider 3 is in the second position, the second end of the second working wall 311 is aligned with the second end of the first working wall 21. When the second end of the second working wall 311 is aligned with the second end of the first working wall 21, the projection of the shape formed by the second working wall 311 and the first working wall 21 on the mold base 1 is a plane equidistant spiral line, so that the first working wall 21 and the second working wall 311 are smoothly connected. At this time, the first end of the second working wall 311 also moves to approximately the upper left of the first end of the first working wall 21, and the distance l between the first end of the second working wall 311 and the end of the first side wall 222 of the groove 22 away from the bottom wall 221 (that is, the end where the first side wall 222 is connected to the first working wall 21) is equal to the thickness of the wire.

[0037] Using the above solution, if Figure 6 As shown, when the wire material extends into the groove 22 of the mold core 2, the mold base 1 rotates (to Figure 6 Taking the perspective of as an example, the mold base 1 rotates counterclockwise), the mold core 2 and the slider 3 also rotate accordingly. At this time, the wire rotates in the opposite direction relative to the mold base 1 (that is, the wire rotates clockwise); when the wire moves to the second end of the second working wall 311 of the protrusion 31 of the slider 3, under the action of the wire clamping force, the slider 3 slides relative to the mold base 1 until the second end of the second working wall 311 is aligned with the second end of the first working wall 21. At this time, the wire is smoothly tangent to the second ends of the two working walls; then, the wire continues to move to the first end of the second working wall 311. Since the distance between the first end of the second working wall 311 and the first end of the first working wall 21 is equal to the thickness of the wire, when the wire continues to rotate for the next circle, it can be smoothly tangent to the wire of the first circle, and no crease will appear between the wires of the outer circle and the inner circle, that is, there is a smooth transition between the outer circle and the inner circle.

[0038] Preferably, if Figure 3 As shown, when the slider 3 is located at the first position, the first end of the second working wall 311 is completely misaligned with the entrance of the groove 22. In other words, the entrance of the groove 22 is completely unobstructed to facilitate the feeding of the wire.

[0039] like Figure 3 and Figure 4 As shown, the mold base 1 is provided with an inner cavity 11, and the slider 3 is embedded in the inner cavity 11 and slidably connected to the inner wall of the inner cavity 11. To facilitate the automatic reset of the slider 3, the slider 3 can be connected to the inner wall of the inner cavity 11 through an elastic connector 4, and the elastic connector 4 can be a spring. With the above solution, the mold structure of this embodiment is small and simple.

[0040] like Figure 3 As shown, the first side wall 222 and the second side wall 223 of the groove 22 on the mold core 2 are parallel to the diameter of the circle corresponding to the first working wall 21. Figure 6As shown, the distance between the first side wall 222 and the second side wall 223 is equal to the thickness of the wire. In this way, the groove 22 has a certain holding force on the wire. When the wire is inserted into the groove 22 and rotated, it is not easy to fall out of the groove 22.

[0041] like Figure 3 As shown, the mold core 2 has a first connecting wall 23, and the two ends of the first connecting wall 23 are respectively connected to the two ends of the first working wall 21, and the protrusion 31 of the slider 3 has a second connecting wall 32, and the two ends of the second connecting wall 32 are respectively connected to the two ends of the second working wall 311. During the sliding process of the slider 3, the second connecting wall 32 of the slider 3 is always in contact with the first connecting wall 23 of the mold core 2, ensuring the stability of the connection between the slider 3 and the mold core 2 and ensuring the position accuracy of the two.

[0042] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A coil spring forming die, characterized in that: include: A mold base, used for connecting with a driving mechanism; A mold core is arranged on the mold base, the mold core has a first working wall for winding the coil spring, the first working wall includes a first end and a second end opposite to each other, the first working wall is provided with a groove close to the first end of the first working wall, the groove includes a bottom wall, a first side wall and a second side wall, the bottom wall is used to abut against the end of the wire extending into the groove, the first side wall is used to form the inner hook of the coil spring, and the depth of the first side wall is equal to the length of the inner hook; A slider is slidably connected to the mold base, the slider has a protrusion, the protrusion has a second working wall for winding the coil spring, the second working wall includes a first end and a second end opposite to each other, the slider has a first position and a second position, when the slider is located at the first position, the second end of the second working wall is misaligned with the second end of the first working wall, when the slider is located at the second position, the second end of the second working wall is aligned with the second end of the first working wall, and the distance between the first end of the second working wall and the first side wall of the groove away from the bottom wall is equal to the thickness of the wire.

2. The coil spring forming die according to claim 1, characterized in that: When the sliding block is located at the first position, the first end of the second working wall is completely misaligned with the entrance of the groove.

3. The coil spring forming die according to claim 1, characterized in that: The mold base is provided with an inner cavity, and the sliding block is embedded in the inner cavity and is slidably connected with the inner cavity.

4. The coil spring forming die according to claim 3, characterized in that: The sliding block is connected to the inner wall of the inner cavity through an elastic connecting piece.

5. The coil spring forming die according to claim 4, characterized in that: The elastic connecting member is a spring.

6. The coil spring forming die according to claim 1, characterized in that: The first side wall and the second side wall of the groove are respectively parallel to the diameter of the first working wall.

7. The coil spring forming die according to claim 1, characterized in that: The mold core has a first connecting wall, and the protruding portion of the slider has a second connecting wall. During the sliding process of the slider, the second connecting wall is always in contact with the first connecting wall.

8. The coil spring forming die according to claim 1, characterized in that: The distance between the first side wall and the second side wall is equal to the thickness of the wire.

9. A spring machine, characterized in that: It comprises a driving mechanism and a coil spring forming die as claimed in any one of claims 1 to 8, wherein the die base is mounted on the driving mechanism.

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