WIRE-FORMING APPARATUS
A forming device includes an input including wire in an unformed state. The forming device has a forming station configured to receive the wire, the forming station comprising a plurality of forms, each independently movable toward and away from the wire such that the forms collectively bend the wire into a formed state that is periodic and defines a wavelength. The plurality of forms bends less than a single wavelength of wire from a unformed state to a formed state at one time
This patent application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. No. 60/940,305 entitled “WIRE FORMING DEVICE AND PROCESS,” having a filing date of May 25, 2007, the contents of which are incorporated herein by reference.
BACKGROUNDThe present invention relates to a forming device and method. In one embodiment, the forming device is configured to form a relatively straight wire into a periodic shape, such as a sinusoidal shape. In some cases forming devices have utilized a gear or teeth to shape a generally straight wire into a sinusoidal shape. Because there are limitations to such approaches, there is a need for the present invention.
In the following Detailed Description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” “leading,” “trailing,” etc., is used with reference to the orientation of the Figure(s) being described. Because components of embodiments of the present invention can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
In one embodiment, forming station 14 includes first, second, third and fourth actuated blocks 41, 42, 43 and 44. Corresponding to each actuated block 41-44 is first, second, third and fourth forms 31, 32, 33 and 34 (illustrated in
In
In one embodiment, first-fourth blocks 41-44 are actuated toward and away from wire 20 along first-fourth rails 51-55, which also lie along the y-axis. Forming station 14 can include a variety of mechanisms that move blocks 41-44, and thus forms 31-34 that are coupled thereto, toward and away from wire 20 in to bend it into a formed state 20b. For example, each of first-fourth blocks 41-44 on first-fourth rails 51-55 can be coupled to, and actuated by, a solenoid that moves each block 41-44 linearly perpendicular to wire 20. Similarly, a pneumatic device can be coupled to each of blocks 41-44 to actuate blocks 41-44 and forms 31-34 toward and away from wire 20 as wire 20 is moved through forming station 14. Other embodiments include other means of moving the blocks 41-44 and forms 31-34 toward and away from wire 20.
In
In one example illustrated in
An illustration of a process of bending wire 20 from its unformed state 20a into its formed state 20b is given in
In
In
In
In
In
In
In
In
One skilled in the art will understand that the subsequent wire processing illustrated in
As is evident from the subsequent wire processing illustrated in
As is evident from the initial and subsequent wire processing illustrated in
In one embodiment, wire 20 has a diameter of four thousandths of one inch (0.004 inch). In other embodiments, wire 20 has a diameter as small as one half of one thousandths of one inch (0.0005), and in others it is as large as ten thousandths of one inch (0.010 inch). Also, a single wavelength (λ20) of wire 20 created by forming points 36-39 is approximately twenty-four thousandths of one inch (0.024 inch), while the amplitude (Y20) of wire 20 in its formed state 20b is and approximately forty thousandths of one inch (0.040 inch). With these fairly small dimensions, and with this ratio of amplitude (Y20) to wavelength (λ20), wire 20 is fairly easily bent, and if a full wavelength (λ20) or more is bent from an unformed state 20a to a formed state 20b at one time, the sinusoidal formed state 20b illustrated in
Also, where the amplitude (Y20) of wire 20 in its formed state 20b is significantly larger than a single wavelength (λ20) of formed wire 20, as illustrated in
In one example, a formed wire 20b has a sinusoidal shape where a single wavelength (λ20) of wire 20 is approximately fifty percent (50%) of the amplitude (Y20), while in another example it is approximately sixty percent (60%) and in yet another it is ninety percent (90%). The length of forming points 36-39 (as illustrated in
In one embodiment, each of forms first through fourth forms 31-34 are configured for independent actuation such that they move independently and consecutively in and out of a forming zone 35, for example moving along rails 51-54. As such, the distance that forms 31-34 are actuated toward wire 20 can readily be adjusted during the forming process by regulating the distance of travel along rails 51-54. In this way, the amplitude (Y20) of the formed state 20b can be adjusted. In one embodiment, the amplitude (Y20) of the formed state 20b is adjusted during the forming process such that the overall amplitude (Y20) of the formed state 20b of wire 20 varies over its length.
Similarly, when forms 31-34 and mounting blocks 41-44 are mounted on rails in the x-axis, the wavelength (λ20) of wire 20 can be adjusted. This is particularly true in the tapered region to accommodate for the slightly different wavelength produced at different amplitudes.
In one embodiment, the indexing or moving a wire 20 through forming station 14 along the x-axis is done mechanically by physically moving wire 20 by one wavelength (λ20), as described and illustrated above in the transition from
In operation, wire 20 is bent from its unformed state 20a to its formed state 20b with first through fourth forms 31-34 in accordance with the process described relative to
Guide pin 29 is configured to be actuated along the z-axis, or in and out of the page as presented in
In one embodiment, guide 28 and guide pin 29 are moveable along the x-axis relative to first through forms 31-34. As such, guide 28 and guide pin 29 can be used to index wire 20 relative to first through fourth forms 31-34. In one example, guide 28 and guide pin 29 are in a “back” position toward output 16 along the x-axis. Guide pin 29 is initially “up” (along the z-axis) and away from guide slot 28a such that wire 20 can move freely in slot 28a. Then, guide pin 29 is actuated “down” (along the z-axis) to hold the wire in place.
Next, wire 20 is formed in accordance with the process described in
Next, all of first through forms 31-34 move out away from wire 20 (along the y-axis). Guide 28 and guide pin 29 are then moved back toward output 16 approximately one wavelength along the x-axis. First and second forms 31-32 then move in toward wire 20 (along the y-axis) and hold wire 20, then third and forth forms 33-34 actuate to bend another portion of wire 20. This process can then be repeated to continually index and bend wire 20.
In one embodiment, one or more of first through forth forms 31-34 can be movable along the x-axis in addition to along the y-axis. In this way, the forms themselves can be used to index wire 20. For example, rails similar to rails 51-54 in
In one example, guide 28 is stationary in all x-, y- and z-axis axes, and guide pin 29 is stationary in the x- and y-axes, while moving in the z-axis. Guide pin 29 starts out in the “down” position. Wire 20 is formed in accordance with the process described in
Next, first and second forms 31 and 32 are then moved back toward output 16 approximately one wavelength along the x-axis. Guide pin 29 then moves downward (along the z-axis) to clamp or hold wire 20 against guide 28 within guide slot 28a. Next, first and second forms 31 and 32 are transitioned out away wire 20 (along the y-axis). Then, first and second forms 31 and 32 are moved to forward toward input 12 approximately one wavelength along the x-axis (back to the position from which they came).
Then, first and first and second 31 and 32 are transitioned in toward wire 20 along the y-axis to hold the part. Then, third and fourth forms 33 and 34 can continue to bend wire 20 in accordance with the process described in
One skilled in the art understands that various embodiments are possible to accomplish the indexing of wire 20. This can be done automatically, or even manually with an operator moving the wire after each sequence detailed in
One skilled in the art also understands that various periodic shapes may be achieved for the formed state 20b of wire 20.
In one example, each of first through fourth forms 71-74 respectively include forming points. In this example, the forming points further include features or grooves that give a forming zone 75 a modified sinusoidal shape. Although wire 20 bent in forming zone 75 will have a periodic shape, it will not be a true sinusoidal shape. Forming zone 75 has a modified sinusoidal shape defining an amplitude (Y75) and a wavelength (λ75). One skilled in the art will understand that various shape for forming zones are achievable with modification to the forms. For example, the forms can include other features, or may even be slanted slightly to produce “tilted” sinusoidal formed wires.
Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or variations of the specific embodiments discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalents thereof
Claims
1. A forming device comprising:
- an input including wire in an unformed state; and
- a forming station configured to receive the wire from the input, the forming station comprising a plurality of forms, each independently movable toward and away from the wire such that movement of the forms toward the wire bend the wire into a formed state that is periodic and defines a wavelength;
- wherein the plurality of forms bend less than a single wavelength of wire from a unformed state to a formed state at one time.
2. The forming device of claim 1, wherein the plurality of forms bend substantially one half of a single wavelength of wire from an unformed state to a formed state at one time.
3. The forming device of claim 1, wherein the plurality of forms constrains no more than one and one half wavelength at one time.
4. The forming device of claim 1, wherein the plurality of forms bend no more than a single wavelength of wire at one time.
5. The forming device of claim 1, wherein the formed state is a sinusoidal shape having an amplitude and a wavelength, the amplitude being greater than the wavelength.
6. The forming device of claim 5, wherein the wavelength is 40-90 percent of the amplitude.
7. The forming device of claim 5, wherein the amplitude is between twenty five thousandths of an inch and forty thousandths of an inch and the wavelength is between fifteen thousandths of an inch and twenty four thousandths of an inch.
8. The forming device of claim 1, wherein the diameter of the wire is between one half of one and ten thousandths of one inch.
9. The forming device of claim 1 further comprising:
- a guide configured to receive the wire in its formed state;
- a clamping mechanism configured to actuate such that the wire is pinned against the clamping mechanism when the clamping mechanism is actuated in toward the guide.
10. A forming device comprising:
- an input including wire in an unformed state; and
- a forming station configured to receive the wire from the input, the forming station comprising a plurality of forms, each having respective forming points defining a forming zone configured to bend the wire into a formed state of periodic shape having a wavelength;
- wherein the forming zone bends no more than one half of the wavelength of wire from a unformed state to a formed state at one time.
11. The forming device of claim 10, wherein the formed state is a sinusoidal shape having an amplitude and a wavelength, the amplitude being greater than the wavelength.
12. The forming device of claim 10 further comprising:
- a guide configured to receive the wire in its formed state;
- a clamping mechanism configured to actuate such that the wire is pinned against the clamping mechanism when the clamping mechanism is actuated in toward the guide.
13. The forming device of claim 12, wherein the guide, clamping mechanism and the forms cooperated to move the wire toward the output by one wavelength.
14. A forming device comprising:
- an input including a wire in an unformed state;
- a forming station configured to receive the wire from the input and to bend the wire into a formed state of periodic shape having a wavelength;
- an output configured to receive the wire in the formed state;
- first and second output forms in the forming station and adjacent the output, the first and second output forms configured to actuate toward the wire in order to hold the wire in its formed state; and
- first and second input forms in the forming station and adjacent the input, the first and second input forms configured to actuate toward the wire in its unformed state in order to bend the wire to its formed state.
15. The forming device of claim 14, wherein the first input form is further configured to both hold and to form wire.
16. The forming device of claim 14, wherein the formed state is a sinusoidal shape having an amplitude and a wavelength, the amplitude being greater than the wavelength.
17. The forming device of claim 16, wherein the first and second input forms bend less than a single wavelength of wire from a unformed state to a formed state at one time.
18. The forming device of claim 16, wherein the forming station forms the wire during initial wire processing and subsequent wire processing and wherein the first and second output forms only hold the wire in its formed state and do not bend the wire from its unformed state to its formed state during subsequent wire processing.
19. A method of forming a wire into a formed state of periodic shape having a wavelength, the method comprising:
- receiving the wire in an unformed state
- actuating first and second output forms adjacent the output toward the wire in order to hold the wire;
- actuating first and second input forms adjacent the input toward the wire in its unformed state in order to bend the wire to its formed state; and
- bending the wire less than a single wavelength at one time from a unformed state to a formed state with the first and second input forms.
20. The method of claim 19 further comprising indexing the wire by one wavelength after bending a single wavelength.
21. The method of claim 19 further comprising actuating first input form toward the wire in order to bend, and subsequently to hold the formed wire in order for the second input form to accurately bend the wire.
Type: Application
Filed: May 27, 2008
Publication Date: Nov 27, 2008
Inventors: Bradley A. Fitch (Woodbury, MN), Mark A. Kempf (Inver Grove Heights, MN), Anthony M. Harrison (Forest Lake, MN)
Application Number: 12/127,582
International Classification: B21F 35/02 (20060101); B21F 45/00 (20060101);