JP3720135B2 - Rolling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling apparatus for rolling and forming a workpiece by a pair of rolling rolls, and more particularly to a rolling apparatus for a deformed section strip material used for a lead frame material of an electronic component.
[0002]
[Prior art]
Such a lead frame material is a prototype of a lead frame that constitutes an electronic component, and has a long section with a deformed cross section whose center in the width direction is thick so as to form a “convex” shape with a flat cross section. It is a thin plate-shaped strip material, which is formed from a simple flat plate-shaped strip material into the above-mentioned deformed cross-section strip by rolling, and then formed into a lead frame having a predetermined shape by punching. Further, the punched lead frame has a semiconductor element or the like fixed to a thick part at the center in the width direction, while the thin part is a lead connected to a printed wiring board or the like, and the leading end of the lead is It is left to be covered with a resin package and used as an electronic component.
[0003]
Here, when the lead frame is covered with the resin package in this way, a gas due to the shrinkage of the resin is generated between the two. In order to remove this gas and improve the airtightness of the resin mold, A pair of concave grooves is formed on the back surface of the thick portion of the lead frame.
And these concave grooves pass the said lead frame material L immediately after carrying out the rolling shaping | molding from the flat strip material to an irregular cross-section strip material between a pair of rolling rolls 1 and 2, as shown in FIG. Molded. That is, of the pair of rolling rolls 1 and 2, a recess 4 having a shape matching the cross-sectional shape of the thick portion 3 of the lead frame material L is formed on the outer periphery of the upper roll 1, while the lower roll 2 A pair of rib portions 5 and 5 are formed on the outer periphery according to the position of the concave portion 4, and by aligning the thick portion 3 with the concave portion 4, the axial lines O ₁ and O _{2 of the} rolling rolls 1 and 2 are arranged. The lead frame material L is positioned, and the concave grooves 6 and 6 are formed at the symmetrical positions in the width direction on the back side of the thick portion 3 by the rib portions 5 and 5.
[0004]
[Problems to be solved by the invention]
By the way, with respect to such a lead frame material L, since the lead frame to be molded from now on is provided as an electronic component as described above, strict dimensional accuracy is also required for the rolled lead frame material L. Is done. For example, the difference between the distances A and B from both side edge portions of the thick portion 3 to the centers of the concave grooves 6 and 6 is defined to be 0.1 mm or less.
On the other hand, in this type of rolling roll, including the rolling rolls 1 and 2 as described above, the relative positions in the axial direction are generally set in advance accurately, and both ends thereof are supported by the support mechanism. Is attached so that it can be rotated about the axis, and once it is attached to the support mechanism, the position in the axial direction is not normally changed.
[0005]
However, in the rolling of the lead frame material L that requires strict dimensional accuracy as described above, if a slight error occurs in the positional relationship between the rolling rolls 1 and 2 in the axis O ₁ and O ₂ directions, this may occur. The accuracy of the distances A and B of the concave grooves 7 and 7 is immediately affected. Moreover, since _{one of} the distances A and B is reduced by this error and the other is increased with respect to the error occurring in the directions of the axes O ₁ and O ₂ , the influence on the difference between the distances A and B is affected by the rolling roll. This is twice the error between 1 and 2.
Therefore, in particular, in a rolling apparatus for forming the concave grooves 6 and 6 in such a lead frame material L, an error does not occur in the positional relationship between the rolling rolls 1 and 2 in the axis O ₁ and O ₂ directions. In addition, the relative positions of the rolling rolls 1 and 2 must be set more precisely and attached to the support mechanism, and the dimensional accuracy of the lead frame material L may be impaired due to errors occurring during the rolling process. To prevent this, the above positional relationship is frequently measured and managed. If an error occurs, the processing must be interrupted and the roll must be reassembled. It is inevitable that a great deal of labor and time is consumed.
[0006]
The present invention has been made under such a background, and even if an error occurs in the position in the axial direction of the pair of rolling rolls as described above, this can be easily corrected. It is an object of the present invention to provide a rolling apparatus that can reduce the labor and time required for assembly and maintenance inspection of the machine and that can perform rolling with high dimensional accuracy.
[0007]
[Means for Solving the Problems]
In order to solve the above problems and achieve this object, the present invention is a rolling apparatus in which a pair of rolling rolls whose axes are parallel to each other are supported by a support mechanism so as to be rotatable about the axis, The support mechanism includes an adjustment mechanism that adjusts the position in the axial direction by relatively moving the pair of rolling rolls in the axial direction, and at least one end of the pair of rolling rolls is connected to the support mechanism. Each of the adjustment mechanisms is supported by a pair of brackets provided, and the adjustment mechanism includes a first adjustment bolt that is screwed into one bracket and that can be brought into contact with the other bracket, and the other bracket. The pair of brackets can be moved relative to each other in the axial direction by a second adjustment bolt that is screwed and can be brought into contact with the one bracket. Characterized in that it is. Therefore, even if an error occurs in the position of the pair of rolling rolls in the axial direction during the rolling process, the error can be corrected without reassembling the rolls by adjusting the position in the axial direction of both rolls by this adjusting mechanism. It can be modified to maintain accurate dimensional accuracy.
[0008]
Here, the pair of rolling rolls are attached so that at least one end thereof is supported by a pair of brackets provided in the support mechanism, and the adjustment mechanism is screwed into one bracket. The pair of brackets includes a first adjustment bolt that can be brought into contact with the other bracket and a second adjustment bolt that is screwed into the other bracket and can come into contact with the one bracket. Can be moved relative to each other in the axial direction, so that the rolling roll can be relatively moved through these brackets with a movement amount corresponding to the pitch of the screw of the first or second adjusting bolt. .
Further, in view of the circumstances as described above, the present invention is a roll used for rolling an irregular cross-section strip as in the case of forming a concave groove in the lead frame material, The present invention is particularly suitable when applied to a rolling machine in which a recess is formed on the outer periphery of the rolling roll and a rib portion is formed on the outer periphery of the other rolling roll in accordance with the position of the recess.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 to 8 show an embodiment of the present invention.
In the present embodiment, the rolling rolls 11 and 12 are arranged vertically in parallel with the axes O ₁ and O ₂ being parallel to each other, and both end portions 11A, 11B and 12A and 12B are supported by the support mechanisms 13A and 13B and 14A and 14B, respectively. And is supported so as to be rotatable around the axes O ₁ and O ₂ . Of these support mechanisms 13A, 13B, 14A, and 14B, the support mechanisms 13A and 14A that support one end portions 11A and 12A of the rolling rolls 11 and 12 are provided via the bracket 15 and the other end portion 11B. , 12B are directly attached to the main body (not shown) of the rolling apparatus, and the bracket 15 of the one supporting mechanism 13A, 14A is attached to the rolling roll 11, An adjustment mechanism 16 is provided for moving 12 relative to the axes O ₁ and O ₂ .
[0010]
Here, the said rolling rolls 11 and 12 are used for rolling of the irregular cross-section strip material which forms a pair of recessed part in the back surface of the thick part of a lead frame material similarly to the rolling rolls 1 and 2 shown in FIG. Although not shown, a recess that engages with the thick part is formed on the outer periphery of the upper rolling roll 11 and the concave groove is formed on the outer periphery of the lower rolling roll 12. A pair of rib portions to be formed is formed in accordance with the position of the concave portion. Further, as shown in FIG. 2, backup rolls 17 and 17 are provided above and below these rolling rolls 11 and 12, and are brought into contact with the outer circumferences of the rolling rolls 11 and 12.
In the figure, the support mechanism 13B for supporting the other end 11B of the upper rolling roll 11 is omitted, but the structure thereof is the other end 12B of the lower rolling roll 12 shown in FIG. Is substantially the same as the support mechanism 14B for supporting
[0011]
The support mechanisms 13A, 13B and 14A, 14B are respectively provided with bearing members 18, 18 and 19, 19 having an outwardly compacted flat plate shape, and the rolling rolls 11, 12 have their end portions 11A, 11B, 12A, 12B is mounted in these bearing members 18 and 19 via a bearing or the like (not shown), and is supported so as to be rotatable about its axis O ₁ and O ₂ . However, while these rolling rolls 11 and 12 are supported by the bearing members 18 and 18 on one end side so as to be integrally movable in the directions of the axes O ₁ and O ₂ , they are in contact with the other bearing members 19 and 19. A slight “play” is given in the direction of the axis O ₁ , O ₂ between them, so that the rolling rolls 11, 12 are axially connected to the bearing members 19, 19 fixed directly to the apparatus main body. Relative movement is possible in the O ₁ and O ₂ directions. Further, coil springs 20 are interposed between the bearing members 18 and 18 and between the bearing members 19 and 19, respectively, and the bearing members 18 and 18 and the bearing members 19 and 19 are provided by these coil springs 20. As the rollers are urged in the direction of separating them from each other, the rolling rolls 11 and 12 are also urged in the vertical direction to maintain the state of being pressed against and brought into contact with the backup rolls 17 and 17, respectively. Will be.
[0012]
On the other hand, the bracket 15 includes a lower bracket 21 as shown in FIG. 6 attached to the apparatus main body and an upper bracket 22 as shown in FIG. 7 attached to the lower bracket 21. These upper and lower brackets 22 and 21 are provided with a pair of flat arm portions 22A and 22A and 21A and 21A so as to protrude toward the bearing members 18 and 18, and the bearing members 18 and 18 are provided with these arm portions 22A and 22A and It is attached between 21A and 21A.
Here, on the inner side surfaces of these arm portions 21A, 21A and 22A, 22A, a ridge portion 23 extending in the vertical direction is formed on the tip side thereof, and an interval is provided on the rear side of the ridge portion 23. A rectangular plate-like material 24 is attached, and a recess 25 extending in the vertical direction is defined between the plate-like material 24 and the ridge 23. On the other hand, protrusions 18A and 18A that fit into the recess 25 are formed on both side surfaces of the bearing member 18, whereby the bearing members 18 and 18 are axial with respect to the upper and lower brackets 22 and 21, respectively. The bracket 15 is attached to the bracket 15 so as to be movable integrally in the O ₁ and O ₂ directions and slidable in the vertical direction. In the other support mechanisms 13B and 14B, the bearing members 19 and 19 are slidable in the vertical direction by a sliding structure (not shown).
[0013]
As shown in FIG. 6, a concave portion 21B that opens upward is formed in the central portion of the upper surface of the lower bracket 21, and the central portion of the bottom surface of the concave portion 21B is further recessed by one step from the bottom surface. Recesses 21C and 21C and a wall portion 21D formed between these recesses 21C and 21C and projecting one step from the bottom surface are provided side by side in the direction of the axis O ₂ of the rolling roll 12, and this wall portion A screw hole 21E is formed in the central portion of 21D in the direction of the axis O ₂ . Further, elongated holes 21F are formed through the bottom surface of the lower bracket 21 to the bottom surface of the recess 21B. Further, on both sides of the lower bracket 21, the lower bracket 21 is attached to the apparatus main body. A mounting portion 21G is provided.
As shown in FIGS. 1 and 4, the plate-like member 24 attached to the arm portion 21A is screwed into the arm portion 21A with a pair of attachment screws 26, 26 inserted through the elongated holes 24A. By wearing, it is attached so as to be movable back and forth in the direction of the axis O ₂ and fixed at a predetermined position. On the other hand, a screw hole 27 is formed from the rear end surface of the lower bracket 21 so as to open to the rear end side of the arm portion 21A, and the tip of the positioning bolt 28 screwed into the screw hole 27 contacts the plate-like material 24. By contacting, the plate-like material 24 is positioned and the width of the concave portion 25 can be adjusted.
[0014]
On the other hand, the upper bracket 22 is formed in a substantially rectangular parallelepiped shape that can be fitted into the recess 21B of the lower bracket 21, and on its lower surface, wall portions 22B and 22B projecting downward from the lower surface, and these wall portions. A recess 22 </ b> C formed between 22 </ b> B and 22 </ b> B and recessed upward by one step from the lower surface is provided side by side in the direction of the axis O ₁ of the rolling roll 11.
And these wall parts 22B and 22B and the recess 22C are the wall parts 22B and 22C in the state (henceforth only called an installation state) which fitted the said upper bracket 22 in the said recess 21B of the lower bracket 21. FIG. 22B is fitted in the recesses 21C and 21C of the lower bracket 21, respectively, and the wall portion 21D of the lower bracket 21 is accommodated in the recess 22C. Further, the width of the recess 22C in the direction of the axis O ₁ is set to be slightly larger than the width of the wall portion 21D in the direction of the axis O ₂ , so that the upper bracket 22 has a difference between the widths in the fitted state. Thus, the inside of the recess 21B can be slid in the direction of the axis O ₁ .
[0015]
Furthermore, a through hole 22D is formed in the wall portions 22B and 22B of the upper bracket 22 along the direction of the axis O ₁ , and the through hole 22D has the wall portion of the lower bracket 21 in the fitted state. It is set to be coaxial with the screw hole 21E formed in 21D. A pair of screw holes 22E, 22E are formed in the direction of the axis O _{1 on} both sides of the through hole 22D in the wall portion 22B on the rear side of the upper bracket 22 among the wall portions 22B, 22B. Further, screw holes 22F are formed on the lower surface of the upper bracket 22 at positions corresponding to the long holes 21F formed in the lower bracket 21 in the fitted state.
Note that the mounting structure and positioning mechanism of the plate member 24 attached to the inner side surfaces of the arm portions 22A and 22A of the upper bracket 22 are the same as those of the lower bracket 21. The lower end surfaces of the arm portions 22A and 22A and the plate-like materials 24 and 24 are flush with the lower surface of the upper bracket 22, while the arm portions 21A and 21A and the plate-like materials 24 and 24 of the lower bracket 21 are used. The upper end surface of the arm portion 22B is flush with the bottom surface of the recess 21B. Therefore, in the fitted state, the lower end surface of the arm portion 22A and the plate-like material 24 and the arm portion 21A and the plate-like material 24 The upper end surface is in close contact with each other as shown in FIG.
[0016]
And in the said adjustment mechanism 16 in this embodiment, in the said fitting state, as shown in FIG. 5, the 1st adjustment volt | bolt 29 is penetrated by the through-hole 22D of the upper bracket 22, and this through-hole 22D. The head 29A of the first adjustment bolt 29 is brought into contact with the rear wall portion 22B of the upper bracket 22 while being screwed into the screw hole 21E of the lower bracket 21 that is coaxial with the upper bracket 22. On the other hand, second adjustment bolts 30 and 30 are screwed into the screw holes 22E and 22E of the upper bracket 22, respectively, and their tips are brought into contact with the wall portion 21D of the lower bracket 21.
Further, from the lower surface of the lower bracket 21, fixing bolts 31 are inserted into the elongated holes 21 </ b> F and screwed into the screw holes 22 </ b> F of the upper bracket 22, and the upper bracket 22 and the lower bracket are fixed by the adjustment mechanism 16. 21 can be fixed when it is relatively moved to a predetermined positional relationship in the directions of the axes O ₁ and O ₂ .
[0017]
However, according to the rolling apparatus having such a configuration, the bearing members 18 and 18 are moved by moving the upper bracket 22 of the bracket 15 relative to the lower bracket 21 by the adjusting mechanism 16 provided in the support mechanisms 13A and 14A. Thus, the rolling rolls 11 and 12 can be moved relative to _{each other in the} directions of the axes O ₁ and O ₂ , and therefore the rolling rolls 11 and 12 should be formed during the rolling process for forming the groove in the lead frame material. Even if an error occurs in the positional relationship between the axial lines O ₁ and O ₂ , the error can be corrected promptly while the rolling rolls 11 and 12 are attached to the support mechanisms 13A, 13B, 14A, and 14B. .
That is, in order to move the upper rolling roll 11 forward with respect to the lower rolling roll 12 to the other end 12B side (left side in FIG. 1), first, after loosening the fixing bolt 31. The second adjusting bolts 30 and 30 are loosened and retracted from the wall portion 21D by an amount corresponding to a predetermined movement amount, and then the upper bracket 22 is advanced by tightening the first adjusting bolt 29, and the second bracket 22D is moved forward. The tips of the adjusting bolts 30 and 30 may be brought into contact with the wall portion 21D again, and then the fixing bolts 31 are tightened to fix the positional relationship between the upper and lower brackets 22 and 21.
[0018]
On the other hand, in order to move the upper rolling roll 11 backward with respect to the lower rolling roll 12 to one end 12A side (right side in FIG. 1), the fixing bolts 31 are first loosened. Next, the first adjustment bolt 29 is loosened, the head 29A is separated from the rear wall 22B of the upper bracket 22 by a predetermined amount of movement, and the second adjustment bolts 30, 30 are tightened. After the upper bracket 22 is retracted and the head portion 29A is brought into contact with the wall portion 22B again, the fixing bolts 31 are tightened.
Thus, according to the adjusting mechanism 16 of the rolling apparatus, the rolling roll 11 can be freely advanced and retracted with respect to the rolling roll 12 only by the operations of the first and second adjusting bolts 2930 and the fixing bolts 31. It is possible to adjust the positional relationship in the direction of the axes O ₁ and O ₂ to an appropriate position after assembling both rolling rolls 11 and 12, and even if an error occurs in this positional relationship during processing. This can be corrected easily and quickly. Therefore, it is possible to accurately maintain the dimensional accuracy of the lead frame material rolled by the rolling rolls 11 and 12 while significantly reducing labor and time required for assembly and maintenance of the apparatus.
[0019]
In addition, according to the present embodiment, the adjusting mechanism 16 moves the rolling roll 11 forward and backward by the first and second adjusting bolts 29 and 30 in this way, so that the first and second adjusting bolts 29 and 30 Depending on the screw pitch of 30, a fine adjustment of the moving amount of the rolling roll 11 can also be made possible. Therefore, even if the positional error between the rolling rolls 11 and 12 is slight, the error can be eliminated by moving the rolling roll 11 with an appropriate amount of movement. Therefore, it is possible to provide a lead frame material with higher dimensional accuracy.
However, in the above-described embodiment, the case where the present invention is applied to a rolling apparatus that forms a groove in the lead frame material has been described, but it goes without saying that the present invention can be applied to other rolling apparatuses. . However, in view of the effect that higher dimensional accuracy rolling can be performed as described above, the present invention rolls a product provided to constitute a precision part including an electronic part. In particular, it is particularly suitable for use in the case of rolling processing of the above-mentioned deformed cross-section strip, in which the axial position accuracy of the rolling roll has a great influence on the dimensional accuracy of the rolled product. By applying as a rolling device, a higher effect can be exhibited.
[0020]
In the above embodiment, the lower bracket 21 of the bracket 15 is fixed to the apparatus body as described above, while the upper bracket 22 can be moved forward and backward with respect to the lower bracket 21 by the adjusting mechanism 16. Although the relative movement is possible in the directions of the axes O ₁ and O ₂ , the upper bracket 22 may be fixed to the apparatus main body and the lower bracket 21 may be moved forward and backward with respect to the upper bracket 22. Further, in addition to the upper and lower brackets 22 and 21, an intermediate bracket or the like is provided on the bracket 15 and fixed to the apparatus main body, while the upper and lower brackets 22 and 21 are provided so as to be able to advance and retract relative to the intermediate bracket. Also good.
Furthermore, the movement of the adjustment mechanism 16 of the above embodiment, by fitted on the bracket 22 in the recess 21B formed in the lower bracket 21, to the axis O ₁ direction while securing the mounting rigidity of the upper bracket 22 In the case where the mounting rigidity of the two can be sufficiently secured, for example, the engagement between the dovetail groove and the dovetail-shaped protrusion or the concave groove and the rail-shaped protrusion can The bracket may be guided. Furthermore, the wall portion 22B on the front side of the wall portions 22B and 22B of the upper bracket 22 can be omitted.
[0021]
【The invention's effect】
As described above, according to the present invention, the pair of rolling rolls can be relatively moved in the axial direction by the adjusting mechanism provided in the support mechanism of the rolling rolls, and between the rolling rolls during assembly or during processing. Errors that occur can be corrected easily and quickly, which can greatly reduce the labor and time required for assembly and maintenance, and require high dimensional accuracy, especially for lead frame materials. In the case of rolling a part to be manufactured, it is possible to provide a high-quality part while strictly maintaining this dimensional accuracy.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of the present invention. However, the upper rolling roll 11 and the bearing members 18 and 19 are omitted.
2 is a side view of support mechanisms 13A and 14A on one side of the embodiment shown in FIG.
FIG. 3 is a partially cutaway front view of the support mechanisms 13A and 14A on one side of the embodiment shown in FIG.
4 is a partially cutaway side view of a bracket 15 corresponding to a WW cross section in FIGS. 1 and 2. FIG.
5 is a partially broken plan view of the bracket 15 corresponding to the XX cross section in FIGS. 2 and 4. FIG.
6A is a plan view of the lower bracket 21 of the bracket 15, FIG. 6B is a side view, and FIG. 6C is a YY sectional view of FIG.
7A is a bottom view of the upper bracket 22 of the bracket 15, FIG. 7B is a side view thereof, and FIG. 7C is a ZZ cross-sectional view of FIG.
8 is a front view showing rolling rolls 1 and 2 for forming concave grooves 6 and 6 in the lead frame material L. FIG.
[Explanation of symbols]
11, 12 Rolling rolls 13A, 13B, 14A, 14B Support mechanism 15 Bracket 16 Adjusting mechanism 18, 19 Bearing member 21 Lower bracket 22 Upper bracket 29 First adjusting bolt 30 Second adjusting bolt O ₁ Axis O of rolling roll 11 the axis of the ₂ rolling roll 12

Claims (2)

A rolling device in which a pair of rolling rolls whose axes are parallel to each other is supported by a support mechanism so as to be rotatable about the axis, and the pair of rolling rolls are relatively moved in the axial direction by the support mechanism. An adjustment mechanism for adjusting the position in the axial direction is provided, and the pair of rolling rolls are supported by a pair of brackets provided in the support mechanism at least one end thereof, and In the adjustment mechanism, the first adjustment bolt screwed to one bracket and made contactable with the other bracket, and the first adjustment bolt screwed to the other bracket and made contactable with the one bracket The rolling apparatus , wherein the pair of brackets are relatively movable in the axial direction by a second adjustment bolt . The said rolling roll is a roll used for rolling of a profile cross-section strip, Comprising: While a recessed part is formed in the outer periphery of one rolling roll, a rib part is match | combined with the position of the said recessed part on the outer periphery of the other rolling roll. The rolling apparatus according to claim 1 , wherein: is formed.

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