JP4781762B2 - Edge processing method for thin sheet metal and thin sheet metal parts - Google Patents

Description

  The present invention relates to a sheet metal part having a sheared sheared part, a ventilation fan having a sheet metal part having a sheared sheared part, and an edge processing method for a sheet metal material having a sheared sheared part. Is.

  In a sheet metal part having a sheared portion that has been sheared by a press, it is necessary to process this in order to prevent cutting by edges (corner portions including burrs) that can be formed in the sheared portion. For edge treatment, swage processing that performs edge crushing (surface punching) with a press die is widely used in addition to painting, barrel finishing, grinder finishing, and sander finishing. In addition, there exists a thing shown by patent document 1 as this type of prior art.

JP-A 63-126625

  For edge treatment by swaging, swaging the entire circumference of a sheared thin sheet metal (a) or swaging by applying the anti-shear side end surface of the thin sheet metal to the stopper of the mold (b) In addition, a method (c) is adopted in which a thin sheet metal member is strongly pressed against a mold by a support urged by an elastic member.

  In general, a sheared portion of a thin sheet metal material has a cross-sectional shape as shown in FIG. That is, a beautiful shearing surface 2 is formed following the slant 1 sinking diagonally, and a rough fractured surface 3 which is torn after the shearing surface 2 is formed over the back side. An edge 4 including burrs is formed at the lower edge of the fracture surface 3. In the method (a), the force balance is as shown in FIG. In this method, the entire circumference of the thin sheet metal member 5 is pinched by the edge-shaped guide portion 7 having the R shape of the lower mold 6 and swaged, so that the lateral force is offset against the swage pressure P and fishing Fit. Also in the method (b), as shown in FIG. 10, the lateral force is counterbalanced and counterbalanced by the reaction force of the stopper portion 8 on the opposite side of the lower mold 6. In the method (c), as shown in FIG. 11, the lateral force is canceled by the total Ra + Rb of the frictional force when the sheet metal material 5 is strongly pressed against the upper mold 10 by the elastic member 9. In this case, it is important that the total Ra + Rb of the frictional force is larger than the lateral force acting on the thin sheet metal member 5 in order to normally swag.

  When the entire periphery of the thin sheet metal material 5 is not swaged and it is difficult to provide the stopper portion 8, the sheet metal material 5 is made of stainless steel or the like. When the yield point of the material is high, the force for plastic deformation by swaging is larger than the maximum frictional force due to the pressing of the elastic member 9, and the sheet metal material 5 is shifted in the lateral direction by pressurization. The same applies when the pressing force of the elastic member 5 cannot be sufficiently exerted. In such a case, the desired edge crushing surface cannot be obtained.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to prevent the sheet metal material from shifting in the lateral direction during swaging, and to easily obtain a desired edge crushing surface. The present invention is to provide an edge processing method for a thin sheet metal material to be obtained, and to obtain a thin sheet metal part having a sheared portion which is rich in design and has no fear of cutting using the edge processing method. The object of the present invention is to obtain a ventilating fan having a thin sheet metal part which is rich in design using the method, has no worry of cutting a hand, and has functionality.

  In order to solve the above-mentioned problems, the present invention provides a sheet metal material having a sheared portion that has been sheared between an upper die and a lower die, and crushes the edge formed in the sheared portion at the bottom of the cavity of the lower die. In the vicinity of the edge deformation induction part, the lateral force generated by the pressing of the sheet metal material by the upper mold and the lower mold is applied to the shearing portion of the sheet metal material by the lateral movement restricting means provided in the upper mold and the lower mold. A means is adopted in which the edge deformation is carried out by the edge deformation guiding portion while the lateral edges are deformed by receiving the lateral force by the step.

  In order to solve the above-mentioned problem, another invention is to provide a step on the surface which becomes both ends of the shearing portion at a position away from the shearing surface of the thin sheet metal material subjected to the shearing processing, Adopt a means to crush edges.

  In order to solve the above-described problem, another invention is a ventilation fan in which a filter in which a filter material is stretched on a filter frame made of a thin sheet metal part having a sheared portion subjected to shearing is provided on the front surface of a main body provided with a blower. In this case, means for providing an integrated edging with a concave step on the front side and a convex step on the back side is adopted on the surface that becomes both ends of the sheared portion of the filter frame.

  According to the present invention, the upper and lower die lateral movement restricting means deforms the surface which becomes both ends of the sheared portion of the thin sheet metal material by stepping the edge and receiving the lateral force by the step while the edge is deformed by the edge deformation guiding portion. Since the sheet metal is crushed, the sheet metal material does not move laterally by pressure, and a desired edge crushing surface can be easily obtained.

  According to another invention, because the surface which becomes the both edges of the sheared portion subjected to the shearing process is stepped and the corners of the fractured surface are crushed, the edge is crushed and the edge is crushed, resulting in a beautiful edge crushing surface. Due to the edging, a thin sheet metal part that has excellent design like an edge in clothing and no fear of hand cutting can be obtained.

  According to still another invention, since the front edge side of the sheared portion of the filter frame that has undergone shear processing is provided with an integrated border with a step on the front side and a convex step on the back side, it moves laterally when the edge is crushed. A beautiful edge crushing surface, and a stepped edging gives a ventilation fan that is superior in design like an edge in the field of clothing and has no fear of cutting, and is captured by the filter material by the convex step on the back side. It is possible to secure a passage for the collected oil to flow down.

  The edge processing method of a thin sheet metal material having a sheared portion subjected to shearing processing according to the present invention is to perform edge crushing (also referred to as squashing or chamfering) by swaging, and swage the entire circumference of the thin sheet metal material. In addition, the present invention relates to edge crushing of a thin sheet metal part in which it is difficult to provide a stopper portion. A thin sheet metal material has a high yield point when plastically deformed, such as stainless steel. The thin sheet metal material having the sheared portion subjected to the shearing process is sandwiched between the upper mold and the lower mold, and a swage process is performed to crush the edge formed in the sheared section. An R-shaped or C-shaped edge deformation guiding portion is formed at the bottom of the lower mold cavity. The cavity has a groove shape so that the sheet metal material can be easily set.

  In the edge deformation guiding portion, lateral movement caused by pressing of the sheet metal material by the upper mold and the lower mold is regulated by providing lateral movement restricting means on the upper mold and the lower mold. This lateral movement restricting means is swaged by the lower edge deformation guiding part while receiving a lateral force by deforming the surface which becomes both end edges of the shearing portion of the thin sheet metal material at a right angle, and receiving the lateral force by this step, that is, Edge crushing.

  In order to squeeze the edge by the edge deformation induction part while receiving the lateral force by the step by deforming the surface which becomes the both edges of the shearing part of the thin sheet metal material by the upper die and the lower die lateral movement restricting means The sheet metal material does not move laterally by pressing the mold, and a desired edge crushing surface can be easily obtained. Thin sheet metal parts to which this edge processing method is applied have stepped deformed parts on the front and back of the sheared part, which not only increases the rigidity of this part, but also increases the rigidity of the part, such as the edge of clothing, shearing surface, fracture Since the step deformed portion is trimmed by collecting the cross sections, a sheet metal part having excellent design performance and good appearance performance and no fear of cutting can be obtained.

Embodiment 1 FIG.
In the present embodiment, a filter 13 in which a filter material 12 is stretched on a filter frame 11 made of a thin sheet metal part 5A as shown in FIGS. 1 to 3 is provided on a front surface of a main body 14 equipped with a blower. This relates to the edge processing of the shearing portion of the filter frame 11. 1 is a front view showing a part of a ventilation fan in cross section, FIG. 2 is a side view showing a part in cross section, FIG. 3 is a plan view showing a lower filter frame, and FIG. 4 is swaged. FIG. 5 is an explanatory view showing a state immediately before, FIG. 5 is an explanatory view showing a state during swaging, FIG. 6 is a sectional view of a processing portion of a sheet metal part subjected to edge processing, and FIG. It is explanatory drawing shown.

  A thin sheet metal material having a sheared portion subjected to shearing has a shearing cross section as shown in FIG. In the edge processing, the edge is crushed by being sandwiched between dies by a swaging process and sandwiched by a press. The filter frame 11 which is the thin sheet metal part 5A subjected to the shearing process is not subjected to the swaging process on the entire circumference, and it is difficult to provide the stopper part on the mold. The material of the filter frame 11 itself has a high yield point when plastically deformed, such as stainless steel.

  The thin sheet metal material 5 having the sheared portion subjected to the shearing process is sandwiched between the upper mold 10 and the lower mold 6, and the edge 4 including the burr formed in the sheared portion is crushed by a press. On the bottom of the cavity C of the lower mold 6, an R-shaped or C-shaped edge deformation guiding portion 7 is formed. The cavity C has a groove shape Ca with a wide entrance so that the sheet metal material 5 can be easily set. In the edge deformation guiding portion 7, a lateral movement restricting means 15 is provided at a position where the upper die 10 and the lower die 6 face each other in the lateral direction generated by pressing the sheet metal material 5 by the upper die 10 and the lower die 6. Lateral movement is restricted (see FIGS. 4 and 5). The lateral movement restricting means 15 is formed by the edge deformation guiding portion 7 of the lower mold 6 while deforming the surface which becomes both ends of the sheared portion of the thin sheet metal material 5 at a right angle step 16 and receiving the lateral force by the step. Swage processing, that is, edge crushing.

  The edge deformation guiding portion 7 is configured such that the lateral movement restricting means 15 of the upper die 10 and the lower die 6 cause the surface which becomes both ends of the sheared portion of the thin sheet metal member 5 to be stepped at a right angle 16 to receive lateral force by the step. Therefore, the sheet metal material 5 does not move laterally by pressurizing the mold, and a desired edge crushing surface can be easily obtained. The sheet metal part 5A to which this edge processing method is applied has step-deformed portions 17 on the front and back of the sheared portion, which not only increases the rigidity of this portion but also increases the rigidity of this portion. Since the step deformed portion 17 is trimmed by gathering the shear surface 2 and the fractured surface 3, the sheet metal part 5A, ie, the filter frame 11, having excellent design and good appearance performance and no fear of cutting can be obtained. The filter frame 11 is often detached and attached during maintenance of the filter 13 and can be touched by hands, but there is no need to worry about cutting. The lower side of the filter frame 11 is formed as a step-deformed portion 17 having a concave front side and a convex rear side, and also serves as a passage for oil that is collected by the filter material 12 and flows down. Then, the oil can be guided to a predetermined oil sump by this path.

  Here, the step Db of the upper die 10 and the step Da of the lower die 6, the dimension Lb from the step of the upper die 10 to the end face of the sheared portion, the dimension La from the step of the lower die 6 to the end face of the sheared portion, edge The relationship between the deformation guiding portion 7 and R is set as follows. When the plate thickness is T, La is desirably 2 × T to 20 × T, but the effect can be obtained even outside this range. Then, La = Lb, Db = Da, and R = Da. Lb and La are not necessarily the same, and Lb may be shortened by about 20% of the plate thickness T. Da need not necessarily be greater than R. The reason is that the material first hits R at the start of processing, but there is no problem because the movement amount shifted in the lateral direction is small. Actually adopted are T = 0.8, La = 2, Lb = 2, Da = 0.3, Db = 0.3, R = 0.4, and edge processing with good appearance and good appearance is achieved. It was realized.

  This edge processing method can be widely applied to an outline or a design surface constituent part of the thin sheet metal material 5 of various devices. For example, the present invention can be applied to a motor outer shell, a blower grill, and the like.

It is a front view which shows a part of ventilation fan in cross section. (Embodiment 1) It is a side view which shows a part of ventilation fan in cross section. (Embodiment 1) It is a top view which shows a lower filter frame. (Embodiment 1) It is explanatory drawing which shows the state immediately before swage processing. (Embodiment 1) It is explanatory drawing which shows the state at the time of a swage process. (Embodiment 1) It is sectional drawing of the process part of the thin sheet metal part after edge processing. (Embodiment 1) It is explanatory drawing which showed the dimensional relationship of each part. (Embodiment 1) It is an enlarged view which shows the cross section of a shearing process part. It is explanatory drawing which shows the conventional swage process. It is explanatory drawing which shows the other conventional swage process. It is explanatory drawing which shows the other conventional swage process.

Explanation of symbols

  5 sheet metal parts, 5A sheet metal parts, 6 lower mold, 7 edge deformation guiding part, 10 upper mold, 11 filter frame, 15 lateral movement restricting means, 17 step deformation part, C cavity.

Claims (4)

The thin sheet metal material having a shear processed shearing portion, and pressed by sandwiching the upper and lower molds, when collapsing the edge made in the shearing part, the edge deformation introducing portion provided in the cavity bottom of the lower mold A concave first step including a vertical surface on the upper mold and the lower mold in the vicinity and a convex second step including the vertical plane and facing the first step are provided, respectively. by sandwiching between said second step, by molding step deformable portion including a vertical surface on the front and back of the thin sheet metal material,
Crushing the edge by the edge deformation inducing portion while receiving the force in the direction perpendicular to the shear plane caused by pressing of the sheet metal material by the upper die and the lower die at the step of the step deforming portion. An edge processing method for a thin sheet metal material. When the dimension from the first step to the end face of the sheared part is La, the dimension from the second step to the end face of the sheared part is Lb, and the thickness of the sheet metal material is T,
La = Lb = 2 × T to 20 × T
The edge processing method for a thin sheet metal material according to claim 1. The thin sheet metal material is a stainless steel material having a shear processed shearing portion
The edge processing method of the thin sheet metal material according to claim 1 or 2. It is a thin sheet metal part crushed by the press sandwiched between the upper die and the lower die, the edge made in the sheared portion that has been sheared,
An edge deformation guiding portion is provided at the bottom of the cavity of the lower mold , and includes the first mold including a first step and a vertical surface including a vertical surface on the upper mold and the lower mold in the vicinity of the edge deformation guiding section . Convex second steps facing each other step are provided, and by stepping between the first step and the second step , a step deforming portion including a vertical surface is formed on the front and back ,
The sheet metal sheet, wherein the edge deformation guiding portion is crushed while receiving a lateral force generated by pressing the sheet metal material by the upper mold and the lower mold at the step of the step deformation section. parts.

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