JPH04304971A - Stress generator of plate spring - Google Patents

Abstract

PURPOSE:To efficiently generate desired stress in various kinds of plate springs of different size and warpage rates. CONSTITUTION:A clamp device H which holds a plate spring can be carried into and out of a main body F taking the form of a gate frame. Capturing tools 48,48 which can be made to abut on the end portions of the plate spring placed on the clamp device H are disposed above the portion of the main body F at which the clamp device H is set, while the capturing tools 48,48 can be lifted and lowered independently of each other. Each of the capturing tools 48 is freely moved along the longitudinal direction of the plate spring. Therefore, after the capturing tools 48,48 have their positions adjusted in such a way as to correspond to the end portions of the plate spring placed on the clamp device H, the capturing tools 48,48 are lowered whereby the plate spring is made to warp backward and exerted with stress.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a stress generator for a leaf spring, and more specifically, a leaf spring that has been subjected to primary processing in the manufacturing process of a leaf spring and is curved into an arched shape with a moderate amount of warp is processed as follows. This invention relates to a generator that generates a required stress inside a leaf spring by deforming it into a state of curving in the opposite direction to the warp direction, prior to shot peening processing in the process.

0002

2. Description of the Related Art Leaf springs are widely used as suspensions in vehicles such as automobiles. When manufacturing this leaf spring, in each process on the manufacturing line,
After the spring material is cut to predetermined design dimensions (length and width), a predetermined warp is applied, and then quenching and tempering are performed, and post-processing such as surface treatment is performed to complete the primary processing. A spring is obtained. This leaf spring is further subjected to shot peening processing in the next step in order to improve properties such as leaf spring strength and durability. Shot peening involves hitting a leaf spring with a large number of steel balls, pieces of wire, etc. at high speed to extend the fatigue life of the spring.

[0003] In order to further extend the fatigue life of the leaf spring, the leaf spring is deformed from the arcuate state in the opposite direction, and shot peening is applied with the required stress generated inside the leaf spring. A process commonly referred to as ``stress peening'' is practiced in the industry. For this reason, a generator is provided during the manufacturing process to generate the required internal stress in the leaf spring. In addition, in this specification, "reverse curvature" means
This refers to deformation to generate even a slight tensile stress on the inwardly curved side of a leaf spring in an arched state, and does not refer only to deformation of the arched shape to the opposite direction completely.

By the way, leaf springs can be roughly divided into ordinary leaf springs S, which are uniformly warped over their entire length and are symmetrical from the center to the left and right, as shown schematically in FIG. 9(a).
1 and an asymmetric leaf spring S2 having different degrees of warpage from the center to the left and right portions, as schematically illustrated in FIG. 9(b). In order to apply stress peening to any leaf spring, the leaf spring is first deformed into a reversely warped state and held in a state where internal stress is generated, and then the process is applied. .

[0005]

[Problems to be Solved by the Invention] As can be understood from the above-mentioned technical background, there are various types of generators for generating the required internal stress in leaf springs, for leaf springs of various lengths and short lengths. It has been adopted. However, in all conventionally known generators, various necessary mechanisms and means are arranged at symmetrical positions on both sides of the main body, which has a work space for reverse warping.
These movements were the same as each other. For this reason, the conventional generator has its own function (capacity) only for the purpose and use of reversely warping deforming (generating stress) the leaf spring S1 mentioned above, and therefore, it does not matter whether the leaf spring is long or short. However, its only function was to transform it into a bow shape. Therefore, it has been functionally impossible for the conventional generator to reversely warp the leaf spring S2 of the above-mentioned different type. Therefore, a dedicated generator for reversely warping the different type of leaf spring S2 is separately required, and therefore, each stress generation process (hereinafter referred to as "each reverse warp") for normal leaf springs and for different types of leaf springs is required. There is a drawback that a separate process (also called "deformation process") must be prepared separately. This was a major bottleneck in simplifying the entire line and suppressing increases in manufacturing costs.

[0006]

Purpose of the Invention The present invention has been proposed in order to suitably solve the above-mentioned problems. To provide a multifunctional stress generator capable of efficiently generating required stress for leaf springs, thereby streamlining the leaf spring manufacturing process and simplifying the entire manufacturing line.

[0007]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and achieve the intended objects, the present invention provides a suitable clamping device which is once set in a predetermined position within a working space aligned with the transfer line of the leaf spring. In a generator that generates stress in a primary leaf spring placed above,

[0008] A pair of stress generating means are provided in a substantially gate frame-shaped body capable of allowing the leaf spring to pass therethrough and forming the working space, and are operable separately from each other;
The present invention is characterized in that stress of the same or different value is generated on the left and right sides of the leaf spring by separately acting corresponding stress generating means on both ends of the leaf spring set in the work space.

[0009]

[Operation] In the above-mentioned stress generator, in preparation for the stress generation work of the primary leaf spring, that is, the reverse warping work, positioning conditions that can be adapted to the type of target leaf spring, that is, the dimensions and degree of warping, etc. According to the setting, that is, the drive conditions of both the left and right position adjustment mechanisms, the positions of both lifting and lowering pressure means and the capture pressure mechanism are set, and the positions of the individual capture tools are set according to the drive conditions of both pressure mechanisms. be done. The primary leaf spring is placed in an arcuate state on a leaf spring clamping device which is temporarily immobilized at a predetermined position within the working space of the main body.

Under this condition, the main operation for the reverse warping work is carried out, and first, according to the forward movement control of the operating cylinder of the pressing mechanism, as the rod descends, the pressing pad at the lower end is moved to a predetermined position of the leaf spring (not shown). (center part) to hold the entire spring immobile. Then, according to the individual forward movement control of the operating cylinders of both lifting and lowering pressurizing means, the capturing and pressurizing mechanisms on both sides are forcibly lowered while being guided by the corresponding link-type holding mechanisms.

[0011] In the descending process of both of the capturing and pressurizing mechanisms, the individual capturing tools come into contact with each end of the leaf spring and pressurize after capturing it, and at the descending end, which is the end position of the work, the reverse warping work is performed. is terminated. This causes the leaf spring to
While being held at three points by the pressing pad and the gripping tools on both sides, it is deformed from a horizontal state to a reverse warped state having a predetermined degree of warpage (degree depending on the magnitude of stress),
It is kept under pressure.

[0012] After the leaf spring in the reversely warped state is clamped and held by the clamp device, the respective operating cylinders of both the lifting and lowering pressurizing means and the pressing mechanism are controlled in a double motion, so that both sides of the leaf spring are clamped and held. The entire capture and pressure mechanism and the pressure pad are returned to the original work starting position and temporarily put on standby.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a stress generator for a leaf spring according to the present invention will be described below with reference to preferred embodiments and the accompanying drawings. The generator of this example is used in the "shot peening processing section (not shown)" in the production line of leaf springs.
The following is an example of what is installed in the "stress generating section" in front of the. Note that other devices related to the generator of this embodiment will be described later as necessary.

[0014] The generator of this embodiment is a single unit that reversely warps (generates stress) a primary leaf spring that is once set at a predetermined position in the work space A and received by an appropriate clamp device H. As shown in FIGS. 1, 2, and 3, the overall configuration of the "multi-functional type" is as shown in FIGS. 1, 2, and 3. , and a pair of left and right stress generating means 70, 70, which are disposed in the main body F and can be operated separately from each other. Each stress generating means 70 includes a position adjustment mechanism C disposed on the upper part of the main body F, and an elevating and lowering pressurizing means D installed in a hanging manner with respect to the elevating part of this position adjusting mechanism C.
, a trapping and pressing mechanism E for a leaf spring that is articulated with the lifting member of this lifting and lowering pressurizing means D and is displaced between a work start position (standby position) and a work end position, and this gripping and pressing mechanism E. It is composed of a link type holding mechanism G that can be articulated and held. Each stress generating means 70 includes a position adjustment mechanism C, a lifting pressurizing means D, a capturing pressurizing mechanism E, and a link type holding mechanism G.
operate separately. Note that a pressing mechanism B for a leaf spring is vertically installed approximately in the center of the main body F.

(About the main body) In explaining the generator according to this embodiment, the main body F and various mechanisms and means will be explained. In the "stress generation part", a horizontal rod 2 is erected in a gate shape that allows the transfer and passage of the leaf spring, and is installed between the upper ends of the vertical rods 1 and 1 on both sides.
The pressing mechanism B and the position adjustment mechanisms C and C on both sides are respectively disposed. Note that the working space A is a space required to reversely warp deform the leaf spring (generate stress), and in the illustration, the displacement range of the capturing and pressing mechanisms E on both sides and the following will be described later. This refers to the spatial area that includes the setting site of the clamp device H and is aligned with the leaf spring transfer line.

(Regarding the pressing mechanism) Next, in the pressing mechanism B, prior to the reverse warping operation, a predetermined portion of the primary leaf spring (
A hydraulic actuation cylinder installed vertically in the vertical center of the main body F, as schematically illustrated in FIG. It is mainly composed of 11. That is, the cylinder 11 is erected on a support base 4 installed in the central recess 3 of the horizontal rod 2 of the main body F, and a connector 13 at the lower end of the rod 12 inserted into the cylinder Pressure rod 14
are connected via pins 15. Furthermore, a pressing pad 16 for a leaf spring is connected to the lower end of the pressing rod 14 via a pin 17.

The lifting pressurizing rod 14 is vertically inserted into a vertical guide tube 6 in a bracket 5 installed inside the center of the horizontal rod 2, and can be vertically moved up and down. Further, the pressure rod 14 and the pressure pad 16 may be detachable and replaceable depending on the type of leaf spring. Incidentally, in the following description, the vertical center of the pressure rod 14 and the pressure pad 16 will be referred to as the work center Y for convenience.

(Regarding the position adjustment mechanism) The pair of left and right position adjustment mechanisms C are for adjusting the work start position of the corresponding capturing and pressing mechanism E in accordance with the type of leaf spring, and both are the same. and is arranged symmetrically with respect to the work center Y. For example, as shown in Figure 5,
A drive motor 22 installed in the main body F, a vertically rotating threaded rod 25 that is supported upright and rotated at a fixed position upon receiving the driving force from the drive motor 22, and a lifting guide connected to the threaded rod 25. It is provided with an elevating and lowering movable body 29 supported by 27.

That is, to explain one position adjustment mechanism C, the motor 22 is of a type capable of forward and reverse rotation (a servo motor, for example), and is installed on the upper surface of each side of the horizontal rod 2 of the main body F. It is installed horizontally on a pedestal 21. The drive shaft 23 of the motor 22 and the shaft support 2 in the frame 21
4, the vertically rotating screw shaft 25 is vertically supported by
They are linked via a transmission means 26 such as a gear. According to the forward and reverse rotation of the screw shaft 25, the elevating movable body 29 is moved up and down along the vertical rail portion 28 of the elevating guide body 27 installed on the pedestal 21, and is fixed at a predetermined position. It has become. Note that the reference numeral 30 indicates a rotation encoder for detecting the rotation of the vertically rotating screw shaft 25.

(Regarding the lifting/lowering pressurizing means) The pair of left and right lifting/lowering pressurizing means D are for generating deformation pressurizing force of the leaf spring, and both are configured identically and symmetrically from the work center Y. For example, as shown in FIG.
The main body is a hydraulic type actuating cylinder 31 installed vertically. That is, to explain one of the elevating and lowering pressurizing means D, the cylinder 31 is connected to the corresponding elevating and lowering movable body 29 by a pin 33 at its substantially central portion, and is vertically moved in a state in which tilting in the horizontal direction in the figure is allowed. It is set up. Further, a connecting tool 34 connected to the lower end of the rod 32 is connected to a predetermined position of the corresponding capturing and pressing mechanism E via a pin 35. It should be noted that both cylinders 31 of both means D are capable of two-step operation so that the respective capturing and pressurizing mechanisms E and E can be displaced to the respective positions of starting and ending work. Further, reference numeral 36 indicates a bellows coated around the outer periphery of the rod 32.

(Regarding the Capture and Pressure Mechanisms) The pair of left and right capture and pressure mechanisms E are for directly capturing both ends of the leaf spring and then pressurizing and deforming them. They are arranged symmetrically from the center Y. For example, as shown in FIG. 7, the capture and pressure mechanism E includes a box-shaped holder 41 connected to the cylinder 31 side of the lifting and lowering pressure means D on each side, and a drive motor installed on this holder 41. 43 , a horizontally rotating screw shaft 45 that is laterally supported by the holder 41 and can receive the driving force from the drive motor 43 and rotate in a fixed position;
It basically consists of a catcher 48 that is guided by.

That is, to explain one of the capturing and pressing mechanisms E, the lower part of the connecting support plate 42 of the holding body 41 is connected to the connecting member 34 at the lower end of the corresponding operating cylinder 31 with a pin 35. The motor 43 installed on the outer upper surface of the holder 41 is of a type capable of forward and reverse rotation (for example, a servo motor), and its drive shaft 44 and the horizontally rotating screw shaft 45 are connected to a gear or the like. They are linked via a transmission means 46. As the screw shaft 45 rotates forward and backward, the catcher 48 is horizontally displaced along the horizontal rail portion 47 of the holder 41 and fixed at a predetermined position.

The catchers 48 on each side can correspond to the widths of various leaf springs, and are aligned on the same plane center line and face each other, and the lower surface of the inwardly protruding portion is , is formed in an inclined shape so as to function as a capture surface 49 that directly abuts the upper surface of each end of the leaf spring. Note that the reference numeral 50 indicates a rotation encoder for detecting the rotation of each horizontally rotating screw shaft 45.

(Regarding the link-type holding mechanism) The pair of left and right link-type holding mechanisms G is connected to the corresponding capturing and pressing mechanism E.
It is used to connect and hold the parts, as well as to provide displacement guidance.
Both have the same structure, are arranged symmetrically with respect to the work center Y, and can be moved independently from each other. For example, as shown in FIG. 8, first and second links 5 forming a pair of long and short links are connected between the bracket 5 of the main body F and the holding body 41 of the corresponding capturing and pressing mechanism E.
1,53.

That is, to explain one link type holding mechanism G, the short first link 51 connects the lower end side of the bracket 5 (lower right side in the figure) and the lower end of the connecting support plate 42 of the corresponding holding body 41. They are articulated by pins 52 and 35 between them. Further, the long second link 53 is articulated by pins 54 and 55 between a pin 54 on the lower side of the bracket 5 (lower right in the figure) and the upper end of the connecting support plate 42 of the holder 41. A four-bar linkage mechanism is constructed. In addition, in both holding mechanisms G, the first links 51 and the second links 53
At the front and back of each other, each part has an X
It is crossed in a shape. Further, the connecting point on the holding body 41 side of the first link 51 on each side is common to the connecting point (pin 35) between the connecting tool 34 of the lifting/lowering pressurizing means D on each side and the holding body 41.

(Regarding the clamp device) The above-mentioned clamp device H, schematically shown in FIG. Ru. Regarding this clamping device H, a pair of clamping tools 62 are movably arranged facing each other on both sides of a main body 61 in the shape of an oblong rail frame, and the positions of both clamping tools 62 are individually adjusted to a predetermined position. It is designed to be fixed and held. Each time the leaf spring according to this embodiment is reversely warped, it is kept on standby below the work space A before the work is performed. Prior to the work, the clamp tools 62 on both sides are temporarily fixed and held at a predetermined position within the work space A in a non-clamped position, that is, in a state in which they are expanded outward. Under this, the transfer device (
(not shown) receives the leaf springs carried in in an arched state and waits. After the work is completed, the work space A is held while the reversely warped leaf spring is being clamped with the clamping tools 62 on both sides.
From there, it is transferred to the next process, the "shot peening processing section."

[0027]

[Operations of the Embodiment] In the generator having the above-described configuration, the operating conditions for each of the mechanisms and means B, C, D, and E are controlled by a control unit (not shown) provided at a required location on the production line. It is set based on necessary data (for example, displacement amount, actuation amount, pressure value, etc.) set for each type of leaf spring. In preparation for the main operation of the reverse warpage deformation work (stress generation work), positioning settings are made to adapt to the type of leaf spring to be targeted.

That is, in accordance with control instructions based on data input in the control section described above, both position adjustment mechanisms C:
The relevant drive motor 22 is operated under individual conditions (either forward or reverse rotation, the same or different driving amounts),
As a result, the vertically rotating screw shaft 25 is rotated at a fixed position (forward rotation or reverse rotation) through the rotation of the drive shaft 23 and the transmission means 26. Following this, each elevating movable body 29 moves up or down along the vertical rail portion 28 of the elevating guide body 27 on the corresponding side, and the position is adjusted.

[0029] As each of the motors 22 is stopped simultaneously or separately, each movable elevating body 29 is fixedly held at a predetermined position. As a result, the position of each operating cylinder 31 of both lifting and lowering pressurizing means D is set, and according to the position setting of each cylinder 31, both capturing and pressurizing mechanisms E are also individually set to a predetermined height position (same or The settings are retained in the different settings. In addition, with the position setting of both the pressure means D and the pressure mechanism E, the operating cylinder 31 and the link type holding mechanism G on each side are both allowed to vary individually.

Further, in accordance with the above-mentioned control instructions, in both of the above-mentioned trapping and pressurizing mechanisms E, the corresponding drive motors 43 are operated under individual conditions (either forward or reverse rotation, and the same or different drive amounts). As a result, the horizontally rotating screw shaft 45 is rotated at a fixed position (forward rotation or reverse rotation) through the rotation of the drive shaft 44 and the transmission means 46. Following this, each catcher 48 moves to the horizontal rail portion 4 of the corresponding holding body 41.
7 (advance inward or retreat outward) to adjust the position. Then, as each of the motors 43 is stopped simultaneously or separately, each of the traps 48
is fixedly held at a predetermined position (symmetrical or asymmetrical position) with respect to the work center Y.

In the above-mentioned setting operation, when applying to the normal leaf spring S1 shown in FIG. The height position of the elevating movable body 29, the operating cylinder 31 of both elevating and lowering pressurizing means D, and the capture and pressurizing mechanism E
The orientation and height position of the holding body 41 are the same. Furthermore, by setting the drive amounts of the drive motors 43 of both trapping and pressing mechanisms E to be the same, the trapping tools 48 on both sides are placed in the same horizontal position. As a result, as shown in FIG. 2, the mechanisms and means C, D, E, G and the entire catcher 48 are held symmetrically with respect to the work center Y and set at the work start position. The main operation is performed under the same operating conditions on both sides.

On the other hand, when applying to the leaf spring S2 of FIG. 9(b), due to the difference in the drive amount of the drive motors 22 of both position adjustment mechanisms C, the elevating movable body 29 on both sides and the elevating/lowering pressurizing means D are The operating cylinder 31 and the holding body 41 of the capturing and pressurizing mechanism E have different orientations and height positions. In addition, due to the difference in the drive amount of the drive motors 43 of both capturing and pressing mechanisms E,
The positions of the traps 48 are also different from each other. As a result, Figure 3
As shown in FIG. 2, the entire mechanism and means and the catch are held asymmetrically with respect to the working center Y. Regarding both of the above-mentioned traps 48, when viewed from the work center Y,
Even if the left and right and top and bottom positions are different, both left and right ends of the leaf spring can be captured synchronously.

However, in any of the positioning setting examples for the various leaf springs described above, the adjustment work of the generator itself according to this embodiment is performed at the work start position (non-work position) schematically shown in FIG. .

For each main operation performed after the above-mentioned positioning setting, the clamp device H is fixedly set at a predetermined position in the work space A, and a predetermined leaf spring is moved to a predetermined position on the clamp device H. The work is started from the work start position based on the control instructions described above.

Therefore, as a first example of the actual operation, a case of reverse warping work related to the normal leaf spring S1 will be described in detail. That is, as shown in FIG. 2, with each mechanism and means C, D, E, and G held in symmetrical work starting positions, first, the actuating cylinder 11 of the pressing mechanism B is controlled to move forward, so that its rod is 12 and the lifting pressure rod 14 is lowered into the working space A. And the pressure pad 16 at the lower end is
After coming into contact with the upper surface of the central part of the leaf spring S1 on the clamping device H, it is held under pressure with a predetermined pressure to fix and hold the spring in its proper posture (see FIG. 10(a)).

Next, both of the lifting and lowering pressurizing means D
The actuating cylinders 31 are synchronously controlled to move forward, and the rods 32 are lowered to push down both trapping and pressing mechanisms E in their entirety with the same pressure. As a result, both pressure mechanisms E descend synchronously while being guided by the corresponding link-type holding mechanisms G, and in the descending process, both traps 48 touch the upper surface of both ends (same part) of the leaf spring S1. contact and capture (Fig. 10(b)
), the same pressure is applied as it is, and the reverse warping work is completed at the predetermined lowering end position.

As a result, the leaf spring S1 is held at three points on the clamp device H by the pressure pad 16 and the traps 48 on both sides, and has a predetermined uniform degree of warping beyond the horizontal state. It is deformed into a reversely warped state and held under pressure as it is (see FIG. 10(c)).

After the leaf spring S1, which has been reversely warped and deformed as described above, is clamped and held by both clamping tools 62 of the clamping device H, the operating cylinders 31 of both of the lifting and lowering pressurizing means D are controlled to move back and forth. By doing so, the rod 32
As the gripping and pressing mechanism E on both sides contracts and rises, the entire trapping and pressing mechanism E on both sides is returned while being guided and supported by the corresponding link type holding mechanism G. Furthermore, by controlling the actuating cylinder 11 of the pressing mechanism B in a backward motion, the pressing pad 16 is returned to its original position as the rod 12 and the elevating pressure rod 14 are raised (see FIG. 10(d)). Therefore, the entire generator according to this embodiment is held in standby at the original work starting position shown in FIG. Thereafter, the clamping device H in the working space A is transferred, and after the next clamping device H is set and the leaf spring is placed, the same main operation as before is performed.

Note that the clamping device H, which is related to the reverse warping work of this example, is operated after the plate spring is pressurized and deformed by both the gripping tools 48.
The clamping tools 62 on both sides extend inwardly and clamp the leaf spring while engaging with both ends of the leaf spring. At this time, both the clamping tool 62 and the catching tool 48 are not interfered with in any way. Thereafter, while the generator according to this embodiment is returned to its original position, the reverse warp leaf spring S1 is held clamped and moved from the work space A along the transfer line to the next process, ``shot peening process''. The data are sequentially transferred to the "Department" side. After the previous clamp device H is carried out of the work space A, a new clamp device H is carried into the work space A for the next main operation, and the next leaf spring is placed thereon.

Incidentally, in the above-mentioned first operation example, both of the above-mentioned traps 48 are held in a predetermined position for any leaf springs of different lengths as long as they are of the same type that normally belong to the leaf spring S1. While set and held in the same position, reverse warp deformation is possible in the same working manner as described above.

On the other hand, as a second example of the main operation, a case of reverse warp deformation applied to the different type of leaf spring S2 will be explained. That is, by the setting operation described above, each mechanism and means C,
This operation will be performed with D, E, G, and both of the traps 48 being positioned in the asymmetrical state shown in FIG. 3. That is, after a different type of leaf spring S2 is placed on another clamping device H fixed in the working space A, first, the actuating cylinder 11 of the pressing mechanism B is controlled to move forward, thereby causing its rod 12 and the vertical movement. As the pressure rod 14 descends, the pressure pad 16 at the lower end comes into contact with the upper surface of the center of the leaf spring S2, and from then on, the spring is held fixed by applying a predetermined pressure (FIG. 11(a)) reference).

Next, the operating cylinders 31 of both of the lifting and lowering pressurizing means D are controlled to move forward at individual timings, and each rod 32 is lowered to push down both of the trapping and pressurizing mechanisms E as a whole. As a result, in the process in which both pressure mechanisms E are lowered while being guided by the link-type holding mechanism G on the relevant side, both traps 48 come into contact with the upper surfaces of both ends of the leaf spring S2 and are then captured. (See FIG. 11(b)). Pressure is applied as it is, and the reverse warping operation is completed at the predetermined lowering end position.

As a result, the leaf spring S2 is held at three points on the clamping device H by the pressing pad 16 and the catchers 48 on both sides, and has a predetermined uniform degree of warping beyond the horizontal state. It is deformed into a reversely warped state and held under pressure as it is (see FIG. 11(c)).

The leaf spring S2 after the above-mentioned reverse warp deformation is
After being clamped and held by both clamp tools 62 of the clamp device H, the operating cylinders 31 of both of the lifting and lowering pressurizing means D are
and the actuating cylinder 11 of the pressing mechanism B are individually controlled in a double motion. Along with this, each of the rods 32 and 12 rises, causing the entire capture and pressing mechanism E and the pressing pad 16 to rise.
is returned to its original position (see FIG. 11(d)), and the entire generator according to this embodiment is held in standby at the original work starting position shown in FIG. Thereafter, as in the previous embodiment, the next clamping device H and new leaf spring S are installed in the work space A.
After 2 is set, a similar main operation is performed.

[0045] Regarding the clamping device H set in the work space A during the reverse warping work in this example, after the plate spring has been deformed under pressure, the clamping tools 62 on both sides hold the leaf spring in the reverse warp state. After that, the generator is returned to its original position and sequentially transferred from the work space A to the next "shot peening processing section".

Incidentally, even in the second operation example mentioned above,
If the leaf springs are of the same type and belong to different types of leaf springs, both of the above-mentioned catching tools 48 are set and held at their respective predetermined positions, and the leaf springs of different lengths are reversely reversed in the same working manner as described above. It is possible to deform it. Of course, for special leaf springs other than those mentioned above, the mechanisms and means B, C,
After properly positioning D, E and the catcher 48, a predetermined reverse warp deformation operation can be performed based on the main operation described above.

[0047] In the example, the leaf spring in the arcuate state is reversely warped in the opposite direction beyond the horizontal state (generating large stress).
Although the present invention is not limited to this, it can also be suitably used when applying a reverse warp (generating a small stress) to an extent that does not exceed the horizontal state.

[0048]

[Effects of the Invention] As described above, according to the stress generator for a leaf spring according to the present invention, the stress generator for a leaf spring according to the present invention is capable of generating the required stress in the primary leaf spring to be subjected to stress peening after the primary deformation process. , the left and right mechanisms and means are individually displaceable, and the individual traps in both trapping and pressing mechanisms for directly restraining the leaf spring can be set at appropriate predetermined positions relative to each other. In addition to springs,
Stress can be efficiently generated in various types of leaf springs, including different types of leaf springs.

Therefore, it is possible to speed up the stress peening process, which is important in the manufacturing process of leaf springs, and to rationalize the manufacturing of leaf springs. Furthermore, since a single generator of the present invention can generate stress suitable for leaf springs of various sizes, there is no need for dedicated generators for various leaf springs, which has the advantage of greatly simplifying the manufacturing line.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a standby state of a generator at a work start position according to a preferred embodiment of the present invention.

FIG. 2 is a front view schematically showing a state in the middle of a work in which stress is normally generated in a leaf spring by a generator.

FIG. 3 is a front view schematically showing a state in which stress is generated in a different type of leaf spring by a generator.

FIG. 4 is a partially cutaway front view mainly showing the pressing mechanism.

FIG. 5 is a front sectional view mainly showing one position adjustment mechanism.

FIG. 6 is a front view mainly showing one of the lifting and lowering pressurizing means.

FIG. 7 is a front sectional view mainly showing one of the trapping and pressing mechanisms.

FIG. 8 is a front view schematically showing a clamp holding device for a leaf spring;

FIG. 9 is an explanatory diagram schematically showing various primary leaf springs.

FIG. 10 is an explanatory diagram illustrating step-by-step a reverse warping operation of a normal leaf spring.

FIG. 11 is an explanatory diagram illustrating step-by-step a reverse warping operation of a different type of leaf spring.

[Explanation of symbols]

A　Work space section B Pressing mechanism C Position adjustment mechanism D　Elevating and lowering pressure means E Capture and pressure mechanism F Main body G Link type retention mechanism H Clamp device S1 Leaf spring 70 Stress generation means

Claims (7)

[Claims] 1. Stress is applied to the primary leaf spring (S1) placed on an appropriate clamping device (H) which is once set in a predetermined position in the working space (A) aligned with the transport line of the leaf spring. In the generator for generating electricity, the plate springs (S1) are disposed in a substantially gate frame-shaped main body (F) that allows the transfer passage of the plate spring (S1) and forms the work space (A), and are operable independently of each other. a plate spring (S1) equipped with a pair of stress generating means (70, 70) and set in the work space (A);
A stress generator for a leaf spring, characterized in that stress of the same or different values is generated on the left and right sides of the leaf spring (S1) by separately acting corresponding stress generating means (70) on both ends of the leaf spring (S1). . 2. Stress is applied to the primary leaf spring (S1) placed on an appropriate clamping device (H) that is once set in a predetermined position in the working space (A) aligned with the transport line of the leaf spring. The generator includes a substantially gate frame-shaped main body (F) that can allow the transfer passage of the leaf spring (S1) and forms the working space (A), and a main body (F) that is vertically installed in the main body (F). a pressing mechanism (B) for the leaf spring, a pair of left and right position adjustment mechanisms (C) that are arranged on both sides of the upper part of the main body (F) and can be operated separately from each other;
), a pair of left and right lifting/lowering pressurizing means (D) are installed in a hanging manner and can be operated separately from each other, and both lifting/lowering pressurizing means (D) are connected to each lifting member. a pair of left and right leaf spring capture and pressure mechanisms (
E) and a pair of left and right link-type holding mechanisms (G) that can individually connect and hold both of the capturing and pressing mechanisms (E). 3. The pressing mechanism (B) is configured to press the main body (F
), an operating cylinder (11) installed vertically in the longitudinal center of the cylinder (11), and an elevating pressure rod connected to the lower end of the rod (12) of the cylinder (11) and supported by the guide member of the main body (F). 3. The stress generator for a leaf spring according to claim 2, comprising a leaf spring pressing pad (16) connected to the lower end of the lifting pressure rod (14). 4. The pair of left and right position adjustment mechanisms (C) include a drive motor (22) that is installed at the top of the main body (F) and can rotate in forward and reverse directions, and a drive motor (22) that is vertically rotatable on the shaft support of the main body (F). A vertically rotating screw shaft (2) is inserted and supported and rotated in a fixed position with respect to the drive shaft of the drive motor (22) via an appropriate transmission means.
5), and an elevating movable body (2) that moves up and down along an elevating guide (27) installed in a part of the main body according to the rotation of this screw shaft (25), and is positioned and held at a desired position.
9) The stress generator for a leaf spring according to claim 2, comprising: 5. The pair of left and right lifting/lowering pressurizing means (D) are arranged to move the lifting/lowering movable body (
29), an operating cylinder (31) vertically installed in a tiltable state, and a rod (3) in the cylinder (31).
3. The stress generator for a leaf spring according to claim 2, further comprising a coupling device (34) for connecting the lower end of the spring 2) to a predetermined position of the corresponding capture/pressure mechanism (E). 6. The pair of left and right capture and pressurizing mechanisms (E) are connected to a connecting tool (34) in the corresponding lifting and lowering pressurizing means (D).
), and a drive motor (41) that is installed in this holder (41) and capable of forward and reverse rotation.
3), a horizontally rotating screw shaft (45) that is laterally supported in the holding body (41) and can be rotated in a fixed position with respect to the drive shaft of the drive motor via an appropriate transmission means, and this screw shaft. (45
), the gripper (48) moves in the left-right direction along the guide portion of the holding body (41) and is positioned and held at a desired position while facing each other. Stress generator for leaf springs. 7. The pair of left and right link-type holding mechanisms (G
) is a bracket (5) installed at the lower center of the main body (F), and a connection point between one end of this bracket (5) and the holder (41) in the corresponding capture and pressurization mechanism (E). a first link (51) connected between one end of the bracket (5) and a second link connected between one end of the bracket (5) and an upper side of the holder (41) in the corresponding capture and pressurization mechanism (E); The stress generator for a leaf spring according to claim 2, having a four-bar link structure comprising a link (53).