JPH0752189A - Out-sert molding plate metal and out-sert molding member - Google Patents

Abstract

PURPOSE:To eliminate strain and burrs of a plate metal and minimize area of hole so as to prevent degradation of strength of the plate metal by nearly unifying direction of pressing process of the plate metal, flattening burrs generated in punching process by pressing for punching and bending process at a next process, and making a hole for preventing a molded boss from falling overlap with a molded hole. CONSTITUTION:The number of times of press moldings for a plate metal is set to at least twice or more and directionality from the top face at pressing process is made to be one-way. In the plate metal 11, a burr 11a is generated in a through hole formed at a previous process. In punching and bending processes at a next process, at least an upper mold 29 at a part which abuts against the burr 11a and a lower mold 28 are flattened, and the burr 11a is compressed in the direction of thickness of the plate metal 11. Dead holes 31 arranged in the shape of satellite on the outer periphery of a through hole 21 to be molded by out-sert molding is overlapped with the through hole 21. The dimension for out-sert molding is made to be larger than the overlapped width so as to wrap the dead holes 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outsert forming sheet metal and an outsert forming member for forming a polymer material on a sheet metal base for mounting mechanical parts such as a VTR.

[0002]

2. Description of the Related Art FIG. 1 is a top view of outsert molding using a polymer material conventionally used in outsert molding. In FIG. 1, 10 is a molded shape of a commonly used polymer material, 11 is a hole in a sheet metal so that the engagement of the molded shape and the molding thickness can be adjusted when the rigidity of the base is required. It is a base sheet metal provided with.

FIG. 10 is a side sectional view of the base sheet metal 11 with holes. In FIG. 10, reference numeral 30 denotes a processing member that is planted in a vertically movable mold (not shown) in the base sheet metal 11, and the base sheet metal 11 moves below the processing member 30 to form a base. A hole is made in the sheet metal 11, and a burr 11a is formed on the base sheet metal 11 at the stage of processing.

FIG. 11 is a top view of the molded shape engaged with the base sheet metal 11. In FIG. 11, 31 is a discarding hole used for peeling or misalignment of the molded shape, and rotation prevention, 21 is a molding part A and a molding part formed of a polymer material by engaging with holes provided in the base sheet metal 11. A21 has a shape to be buried in the hole of the base sheet metal 11, and is a waste hole 31 provided in the base sheet metal 11.
By engaging with the formed part formed on the base sheet, it prevents the sheet metal 11 from deviating or peeling on the plane, and damages due to the stress due to the difference in the thermal expansion coefficient between the sheet metal and the polymer material due to the ambient environmental temperature. It is preventing.

FIG. 12 is a cross-sectional side view of a shaft formed of a polymer material that engages with the base sheet metal 11. In FIG. 12, a gear 22 which is a separate component (not shown) is a base sheet metal 11
Bearing surfaces a and 22a provided with steps to form a gear receiving surface configured to transmit the driving force from the lower surface side to the upper surface of the
Is a shaft a for inserting and rotating the gear of another component provided on the bearing surface a22, the gear of the other component is inserted until the shaft a22a hits the bearing surface a22, and is rotated by the drive source. The driving force is transmitted from the lower surface to the upper surface, and since the shaft a22a serves as the rotation center of the gear, the dimensional accuracy of the diameter of the shaft is within a tolerance of several microns to several tens of microns. The height direction is 10 mm or more, and the surface roughness is ensured to be accurate enough to withstand rotation. Further, the base sheet metal 11 and the bearing surface a22 are engaged with the molding portion formed in the waste hole 31 provided in the base sheet metal 11 as in the case of FIG. It also prevents peeling and damage due to the difference in thermal expansion coefficient between the sheet metal and the polymer material due to changes in the ambient temperature of the outer circumference.

FIG. 13 is a sectional side view in the case where a hole made of a polymer material that engages with the base metal plate 11 is formed. In FIG. 13, the reference numeral 23 designates fixed molding portions a and 23a engaged with the base sheet metal 11.
The shaft provided on the fixed molding part a23 can be attached and detached, and the dimensional accuracy of the diameter is set within a tolerance of several microns to several tens of microns so that the shaft can be freely rotated. As for the shaft hole a, the base sheet metal 11 and the fixed molding portion a23, which are ensured to withstand the rotation, the molding portion formed in the waste hole 31 provided in the base sheet metal 11 is the same as in FIG. By engaging with each other, deviation from the plane of the base sheet metal 11 and peeling are prevented, and damage due to stress due to a difference in thermal expansion coefficient between the sheet metal and the polymer material due to the environmental temperature of the outer circumference is prevented.

FIG. 14 is a front view and a side sectional view of a snap-fit shape which is made of a polymer material which engages with the base sheet metal 11 and in which another component (not shown) can be detachably attached. In FIG. 14, reference numeral 25 is a fixed molding portion b, 25a engaged with the base sheet metal 11, and is attached to a fitting portion of another member (not shown) through an elastic portion composed of the fixed molding portion 25, and is placed on the flat surface of the sheet metal. The nails a and 25b, which prevent them from coming off from the upper part, are fixed molding parts
Plate portion a that is operable to open the claw a25a by bending within the elastic limit in a direction away from the hooking direction of the claw a25a, and the claw a25a is a protrusion that joins and holds a fitting portion of another member of the plate portion a25b. There is a portion, and the attaching / detaching operation can be performed by bending the plate portion a25b within the elastic limit and opening the claw a25a to a size larger than the holding portion of the other member so that the other member can be removed.

FIG. 15 is a perspective view of a snap-fit shape which is made of a polymer material which engages with the base sheet metal 11 and in which another component (not shown) can be detachably attached. In FIG. 15, reference numeral 26 is a fixed molding portion c, 26a engaged with the base sheet metal 11.
The claws b and 26b for preventing the separate member (not shown) from coming off in the downward direction are formed integrally with the claw b26a, and are plate portions c and 26c that can be curved within the elastic limit. And 26d are lugs for improving flow when molding a polymer material and for improving rigidity, and claws b26a are projecting portions that are joined and held to a fitting portion of another member. Yes Detachment operation is performed on the plate b26b
Due to the bending within the elastic limit, the claw b26a opens up to a size larger than the maximum size of the holding portion of the separate member, so that the separate member can be freely attached and detached.

FIG. 16 shows an outsert component formed of a polymer material that engages with the base sheet metal 11 and fixed to the base sheet metal 11 so as to cover the surface of the sheet metal when there is another molding part near the periphery. FIG. 4 is a top view in which holes that require relatively high precision for positioning are provided. In FIG. 16, 27 is the base sheet metal 11
The fixed molding portions d and 27a engaged with the fixed molding portion d27 are positioned in the fixed molding portion d27 through the flat surface of the base sheet metal 11 and the fixed molding portion d.
27 is a base sheet metal in a state where it is engaged with the base sheet metal 11 and is fixed in a large area due to the presence of another molding part near the periphery.
It is necessary to form the positioning hole 27a with relatively high precision in order to regulate the position when joining 11 different parts.

[0010]

According to the first aspect of the present invention, the molding of the polymer material requires that the wall thickness be made uniform and even under the influence of the shrinkage of the molding, and in order to deal with this, it is common to provide a meat steal. . However, due to the problem of the molding shape at the time of outsert, the above-mentioned meat stealing requires a hole penetrating the sheet metal. Naturally, the sheet metal and the molding have an integrated structure, but in reality, a gap occurs between the sheet metal and the molding due to the molding shrinkage. Here, the problem with sheet metal is that it is often formed by pressing because a large number of holes are required in the sheet metal, and the sheet metal of the press is burred (the flat cross section of the sheet metal by the press is edge-shaped in the die cutting direction). When a heat-shrinkage occurs due to an environmental temperature difference such as when the polymer material is left after injection molding or when it is stored in a warehouse after the injection molding of the polymer material is completed, the heat shrinkage due to the environmental temperature difference causes the sheet metal to Since the burrs and the molding deviate due to the difference in shrinkage, cracks may occur in the molding, so it is now common to partially press the burrs of the sheet metal, but it is necessary to press the die for sheet metal processing. There are problems that the structure is complicated and adjustment is difficult, the modification due to design change is very complicated, and machining is not possible due to the die structure.

In the second aspect of the present invention, the fixing of the outsert sheet metal and the forming is basically performed by forming a hole in the sheet metal so that the forming portion penetrates the sheet metal and fixes the sheet metal so as to sandwich the sheet metal. By forming a connecting hole in the vicinity and connecting the molding to the through hole, the collapse due to rotation and molding contraction is prevented by utilizing the contraction of molding. Also, in order to reduce the injection part, runners are arranged on the sheet metal to form the formation of each part, but it may be used to stop rotation and prevent falling, but it is always necessary to have a small through hole near the forming part. It is necessary to fix the metal mold on the die and steal the meat, and a small diameter rotation stop and a fall prevention hole are opened on the outer periphery of the hole at a certain distance or more, which impairs the rigidity of the sheet metal itself. .

According to a third aspect of the present invention, a boss formed of a polymeric material on a sheet metal is provided with a taper within a tolerance range of the same diameter, but when the height is high, the draft of the die is increased. Since the height is limited because it can not be taken well, the precision is improved by setting the molding conditions and re-machining the shaft dimension in order to keep the design constraint severe and the boss within the tolerance. Since bulging and dimensioning of the root may not be possible in electrical discharge machining, it is necessary to take measures such as nesting, which makes it considerably expensive in terms of time and cost.

In the fourth aspect, the bearing hole formed of the polymer material on the sheet metal has severe design constraints as described above, and it takes time and cost to secure dimensional accuracy. Is a problem with.

According to a fifth aspect of the present invention, a separate member made of a polymer material is received on the sheet metal and slid on the sheet metal surface, or a guide groove is provided in a hole penetrating the sheet metal surface. When the sliding length of the shape in which the member is guided and slid is long, the coefficient of thermal expansion differs from that of the sheet metal and the polymer material, and at high temperatures the expansion of the molding material is large in the longitudinal direction, so peeling and breakage with the sheet metal When the molding height is very high, the current configuration is that the thermal expansion and contraction of the molding in the height direction is cut at the required places to have intervals, but the expansion and contraction of the root part are also taken into consideration. That was not the case.

According to a sixth aspect of the present invention, the sheet metal member is formed of a polymer material, and the snap-fit for holding another member in a claw shape has a bending holding force within the elastic limit of the polymer material. However, it may not be possible to configure within the elastic limit for repeated load. This is because the amount of deflection is insufficient in calculation because the tip end of the claw portion is configured to have a uniform movement amount. Therefore, there is a case where the amount of flexure is not within the elasticity, and there is a plastic deformation amount region in which the residual strain does not return to the fixed position. This causes a crack at the base of the snap fit that engages with the claw portion at worst when another component is attached or detached.

According to a seventh aspect of the present invention, the sheet metal member is formed of a polymer material, and the snap fit for holding another member in the claw shape has the same structure as that of the conventional one. The holding power is halved when the relative strength is relatively high. Therefore, it is necessary to limit the length of the claw that is configured, but if there is a molding part that tries to maintain its position separately from the claw part,
Another member is formed at a position different from the claw shape. In the case described above, there are various forms, but in outsert molding, it is desirable to form them in the vicinity of the claw portion, and therefore, a guide for inserting another member and a fixing portion for ensuring positional accuracy are required. Further, a molding portion such as a rib is provided on the release side of the claw so that the amount of flexure is not plastically deformed and is fixed by a certain amount of flexure so as not to cause plastic deformation. Although the deformation is prevented by the above-mentioned meat stealing, in this case, since the portion for holding the claw movement amount on the back surface and the bent portion of the claw are connected to each other, the heat quantity is abnormal at the meat-throwing portion during molding. Since the claw portion falls down on the release side because of the difference, the holding claw does not hold another member.

According to the eighth aspect of the present invention, when the sheet metal member is formed of a polymer material and a circular hole for positioning is formed by molding, and if there is a molding member adjacent to the outer peripheral portion, the positioning is performed as described above. Since the circular holes are engaged with each other so as to form the same shape, the circular shape is deformed due to the difference in contraction due to the contraction in molding. Since this deformation cannot be predicted, no measures have been taken so far.

The present invention has been made to solve the above problems, and in the first aspect of the present invention, the punching of the sheet metal is conventionally performed by pressing at the same time in the vertical direction, but outsert molding is performed. Since sheet metal flows the molding material to each part through the sheet metal surface, sheet metal burrs have a great influence on the fluidity, so all the hole drilled parts (excluding parts that are not outsert molded) are C-chamfered by re-pressing. I responded,
Since the processing from both sides by pressing leaves a very bad effect on the distortion of the sheet metal and the processing dies are densely packed, there are cases where it cannot be changed, so the pressing process on the processing is directed from the top In order to improve the accuracy, the strain due to the press working in the previous process is eliminated by re-pressing a flat surface or the like with a press die in the next process so as to eliminate the strain and burrs of the sheet metal.

In the second aspect of the present invention, a hole which is at least required to fix the molded portion of the polymer material on the sheet metal, and a hole for preventing rotation and falling down, which overlaps with a hole for meat stealing, are overlapped. In order to prevent rotation by punching a hole in the sheet metal in the shape of, and preventing the removal by making the dimension of the rotation prevention hole larger than the dimension of the overlapping part, the configuration that satisfies both functions with the minimum hole area on the sheet metal Become.

In the third aspect, when the boss shape of the polymer material is a shaft having an excessively high height, the diameter of the shaft becomes a state in which the taper cannot be machined and the workability by the additional processing is also straight. It is conceivable that other parts of the linear axis will be out of size even if electrical discharge machining is performed. In this regard,
By coping with the axis having the same axis center and having a step, it becomes easy to correct the dimensional tolerance of the shaft diameter due to machining when the dimensional accuracy of the root portion and the tip portion is adjusted by the difference in the shaft diameter in the electric discharge machining.

According to the present invention, when the fitting length is relatively long, in order to accurately finish the hole diameter dimension with the mating member, a punching taper is not provided in the straight hole, so that the phenomenon of biting into the mold is observed. It is possible to improve the dimensional accuracy of the necessary parts by providing a step with a step to prevent damage and damage, and because it is not possible to improve the dimensional accuracy of the intended place by electrical discharge machining. .

According to a fifth aspect of the present invention, a guide groove is formed on the sheet metal with a polymer material and slides on the sheet metal surface by receiving another member, or a guide groove is provided in a hole penetrating the sheet metal surface on the side surface of the groove. Another member is guided and slides, and the coefficient of thermal expansion is different between the sheet metal and the polymer material when the sliding length is long. For example, when the temperature is high, the expansion of the molding material in the longitudinal direction is large. Therefore, peeling and breakage from the sheet metal occur. In order to eliminate this, by partially providing an unformed portion from the forming upper surface to the sheet metal in a state where the forming portion on the sheet metal plane intersects in the longitudinal direction at a necessary location where breakage due to expansion in the longitudinal direction occurs,
If the expansion and contraction of the polymer material is molded in such a manner that the unmolded part is displaced within the elastic limit, no damage will occur.

According to a sixth aspect of the present invention, the snap fit for holding another member in a claw shape is formed of a polymer material on a sheet metal, and has a flexure holding force within the elastic limit of the polymer material. Although it is molded, in the case of molding in which the dimension of the molding root and the dimension of the upper end are tapered, the amount of deformation within the elastic limit can be displaced several times with respect to the same load. Therefore, it is possible to prevent damage to the root part by providing a gradient with a specification different from the normal draft taper, and to create a sufficient margin without repeated plastic deformation even with repeated snap-fitting of another member.

In the seventh aspect, when the bending portion of the claw is located at a position relatively higher than the flat surface of the base sheet metal, and the forming portion for holding the position at another portion coexists. In order to prevent plastic deformation of the amount of bending so that it can be settled by a certain amount of bending, a molded part such as a rib is provided on the release side of the claw so that the holding part is close to the claw shape. If it exists, if the shape of the holding part and the plate part, which is the bending part of the claw part, are not connected in the width direction and engage with the thickness as thin as possible in the bending direction, the influence of heat shrinkage will be reduced from the cooling rate and heat dissipation conditions. It is possible to suppress deformation.

According to the eighth aspect of the present invention, the sheet metal is formed of a polymer material, and when a circular hole for positioning is formed by molding, and if there is a molding member adjacent to the outer peripheral portion, the above-mentioned positioning is performed. Since the circular holes of are engaged with each other so that they will have the same molding, the circular shape will be deformed due to the difference in contraction due to contraction during molding, but at the time of manufacturing the deformation due to molding contraction and the required molding round hole Deformation can be prevented by carrying out meat stealing so that a round shaped portion is not formed on the connecting line and in the vicinity of the required hole.

[0026]

[Means for Solving the Problem] In punching a sheet metal,
If the usage state is a molding of a polymeric material that is molded on the upper surface and a thin wall with a thickness of about 0.5 mm molds the sheet metal hole, and the back surface is molded at least thicker than the above-mentioned wall thickness, For the punching of the sheet metal, press punching is performed from the top surface, and if possible, all punching and external press working should be the same. However, when the mold on the back side is thin, the hole is completely reversed. In addition to the above, burrs are generated on the surface opposite to the processing direction due to the punching by the press, but there is no burr removal process such as an additional press.

According to a second aspect of the present invention, the holes of the sheet metal are formed by scissoring the sheet metal in the state of penetrating the sheet metal at the time of forming. In addition, the rotation stop holes are formed in an overlapping manner.

According to the third aspect, when the boss shape of the molding portion is relatively high, the shaft is formed coaxially with a step.

According to the fourth aspect, when the shaft hole of the molding portion is relatively high, the hole is formed coaxially with a step.

According to a fifth aspect of the present invention, outsert molding in a state where the sheet metal having a long groove shape such as a guide and having a hole is engaged with the hole is performed, and the upper and lower surfaces have a relatively thin cross-section molding thickness. In the state, the molding long groove was formed between the thicknesses up to the sheet metal so as to substantially intersect the molding longitudinal direction of the upper and lower surfaces.

With respect to the sixth aspect, the thickness of the surface contradictory to the shape of the claw portion is such that the tip portion is thin and the root portion is thick in the height direction. However, the amount of draft taper is not general because it is basically not quantitative for setting the condition for peeling from the mold of the molding part.

According to a seventh aspect of the present invention, there is formed a snap fit shape in which a claw shape and an elastic plate shape are engaged with each other, and a back surface which is opposed to the claw portion with a certain interval to regulate the claw shape from bending. If there is any, the engagement between the two is in a shape that is perpendicular to the sheet metal surface and parallel to the height direction.

According to the present invention, in a state where a hole is formed on the plane of the sheet metal, the hole is deformed on the plane with respect to the hole of the polymer material engaged in the hole in a molded manner. A circular dent shape is formed in the height direction with respect to the plane at the intersection of the satellite states centered on the hole and on the axis of the deformation centered on the hole.

[0034]

According to the first aspect of the present invention, in the case of a sheet metal for outsert molding, when a large number of holes are provided on the flat surface of the sheet metal, burrs are usually generated in the direction of penetrating from the side where the hole is punched. After performing the first press punching by providing the number of times of at least 2 times or more, the first punching part is pressed again on the flat surface at the time of the next press punching, thereby crushing the burrs. It can be made flat and the flow resistance due to the injection of outsert molding can be reduced.

With regard to claim 2, when there are overlapping holes on the sheet metal and a polymer material is formed in this portion,
Molding is connected at the common part of the sheet metal and rotation is stopped, and the conventional joint runner prevents collapse due to molding shrinkage with the joint hole, but the joint hole of the sheet metal overlaps with the molding steal hole If the overlapping width is smaller than the forming hole and the connecting hole, the sheet metal is inserted, and the sheet is engaged with the sheet metal during the molding contraction.

According to the third aspect, when the shaft made of a polymer material on the plane of the sheet metal is composed of a shaft having a diameter that forms two or more steps on the same axis, the dimensional accuracy tolerance of the shaft is large. When the configuration cannot be achieved unless the product is finished at a high level above a certain level, the axis that stands upright on the plane of the sheet metal is closer to the sheet metal surface than the diameter of the shaft that is located higher than the sheet metal surface. With the large size, it is possible to improve the dimensional accuracy of the shaft diameter with relatively high accuracy by additional processing and workability. This has no effect when the height of the shaft is relatively low in constructing the shaft, but when there is a relatively high shaft length and a straight shaft diameter is used, it is performed with an outsert molding die. The shaft diameter may not be stable and may be deformed, but if a step is provided, the size of the target height can be adjusted and only the necessary part can be processed at the processing stage, and processing is added to other parts. There is nothing. Further, in the above description, the purpose of penetrating and engaging the sheet metal is mainly to fix the shaft, and the other purpose is to provide a flesh for forming a uniform cross section. still,
The separate member to be inserted into this shaft must have a hole and have the same step difference in the shaft diameter. Therefore, the one having a long axial length is preferable.

With respect to claim 4, according to the content of the item relating to the shaft of claim 3, the shaft hole formed of a polymer material on the plane of the sheet metal coaxially has a diameter of two or more steps. In the case of being composed of, the dimensional accuracy of the hole diameter and the workability are improved.

According to the fifth aspect, when the molding length of the polymer material undergoes thermal expansion and contraction in the longitudinal direction, an excessive load is applied to the molding portion, and the coefficient of thermal expansion and contraction of the sheet metal and the polymer material is If they are different, the pitch of the connecting holes for fixing will inevitably be set, but as a structure to avoid this, a connecting hole is provided in the sheet metal of the thin long groove for the guide and a structure for engaging the connecting holes. In the upper part or between the connecting hole and the connecting hole, a thin guide portion is provided with a deformation groove reaching the sheet metal surface or corresponding to the groove so as to facilitate the molding expansion and contraction and the expansion and contraction. The amount of deformation is absorbed by the bending of the deformation groove.

According to a sixth aspect of the present invention, a snap fit shape having a function of holding a member for fixing or rotating another member by an outsert-molded claw structure prevents deformation of the claw portion within the uniform strength and elasticity and due to creep. In the configuration in which another member is inserted by the bending within the range in which the bending does not occur and the bending is restored and is fixed by the claw, the aligning force can be set by the aligning force of the material, but the height of the bending is relatively large. It is very difficult to attach / detach another member within the elasticity of the low bending portion, but the thickness of the root facing the plate-like bending and the thickness of the tip of the bending are made smaller toward the tip, so that the amount of bending is increased. Prevents damage caused by bending of the root part.

According to a seventh aspect of the present invention, the snap fit structure of the outsert-molded curved plate-shaped portion and the claw is used to restrict and reinforce the curved portion at a position facing the claw at a position opposite to the claw. In the conventional structure, the joint with the double-sided portion is a state in which the protruding surface of the claw and the reinforcing portion on the back surface are connected by a surface, but the plate portion and the reinforcing portion of the claw portion configured in parallel due to contraction during molding. Even if the contraction rate is the same in the thickness direction of the part that connects the parts, it deforms due to the temperature difference.Therefore, due to this molding contraction, the claw part falls to the reinforcing side and the tip part of the claw separates from the holding part of another member By connecting the joints with ribs vertically to the curvature of the plate, the effect of heat is mitigated and deformation is suppressed.

According to the eighth aspect, a round hole or the like is formed in the sheet metal by outsert molding, and a hole requiring a perfect circle is often deformed due to the influence of molding which is joined to the outer peripheral portion, but the deformation is predicted in advance. Therefore, it is very difficult to check the state of deformation, and it is a point that intersects with the center of the round hole and the direction of deformation and the outer periphery of the forming hole.Therefore, make a punch hole near the necessary forming hole to steal the forming part. By providing the shrinkage in the deformation direction described above, the amount of deformation is adjusted to form a perfect circle. Therefore, the round holes provided in the vicinity have good workability and relatively low cost.

[0042]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 10, the base sheet metal 11 has a structure sandwiched by an upper die and a lower die of a sheet metal die (not shown),
When the necessary holes are formed in the base sheet metal 11, the processing member 30 is configured to project from the upper surface, and when the sheet metal mold is in a state in which the base sheet metal 11 is not scissored and misaligned, the processing member 30 becomes the base sheet metal 11. To form a hole. However, when forming a hole, the lower die has a hole having a size slightly larger than the processing member 30, and the hole formed in the base sheet metal 11 is cut off by the processing member 30 and the hole of the lower die. Since the hole is formed in the state, the hole of the base sheet metal 11 at the aligning portion forms a burr 11a due to the aligning downward. In FIG. 2, 29 is an upper die of a sheet metal die, 28 is a lower die of the sheet metal die, and base sheet metal 11 is an upper die 29.
It is sandwiched between the lower mold 28 and the base metal plate 11,
There is a hole that penetrates first and the burr 11a is formed.

Next, this operation will be described. The base sheet metal 11 is in a state after the stroke in which the hole has been drilled in the previous stroke, and the burr 11a has been formed in the through hole, so that the hole that was previously generated in the drilling or bending stroke in the next stroke is With respect to the burr 11a portion, at least a portion corresponding to the burr 11a has a shape in which the upper die 29 and the lower die 28 are flat or are flat and slightly protrude, and the burr 11a of the base sheet metal 11 is made to extend in the thickness direction of the base sheet metal 11. The operation of compressing to.

Example 2. As an embodiment according to claim 2, in FIG. 3, 11 is a base sheet metal, 21 is a through hole provided in the base sheet metal 11 and a molding portion that engages therewith to form a required shape, 31 is a base sheet metal. It is composed of a satellite-shaped discarding hole 31 provided in a satellite shape on the outer periphery so as to overlap the through hole for forming the molded portion provided in 11. When outsert molding is performed on almost the entire circumference of the hole that penetrates the sheet metal in the base sheet metal 11 in the thickness direction, as a means to prevent peeling or misalignment of the molding, the satellite shape is centered around the molding part. With the intersection of the center formed by and the hole penetrating in the plate thickness direction of the above-mentioned sheet metal and overlapping with the through hole of the molding part, and the notch of the overlapping hole is smaller than the diameter of each hole. At one time, the outsert molding provided all around was wrapped around the waste hole 31.

Further, in FIG. 3 in the embodiment of claim 2,
Although the circular discard hole 31 is shown in the drawing, unless otherwise specified, the wedge hole or the like to be formed and the discard hole 31 may be of any size as long as they are larger than the widths of the overlapping notches.

Example 3. As an embodiment according to claim 3, in FIG. 4, 11 is a base sheet metal, 22 is a molding portion formed by joining the base sheet metal 11 with a polymer material, and 22b is a base portion of the shaft fitting formed in the molding portion 22. A partial shaft, 22a, is a shaft formed in the molding portion 22 and coaxial with the shaft 22b. The shaft 22a, which is the base part of the shaft fitting, is a rotating shaft of a separate component formed of a polymer material on the base sheet metal 11, and has a large shaft diameter at a portion closer to the sheet metal surface and becomes smaller as it is farther from the sheet metal. The upper and lower shaft diameters are the same as the mating insert parts (not shown) and are rotatable.

Further, when a separate member (not shown) is fitted to improve the positional accuracy and the squareness and parallelism, the above configuration may not be rotatable. The shape at this time is not necessarily cylindrical.

Example 4. As an embodiment of claim 4, in FIG. 5, 11 is a base sheet metal, 23 is a molding portion formed by joining the base sheet metal 11 with a polymer material, and 23b is a molding portion 22 and is fitted with a shaft. The hole 23b, which is the base portion of the hole 23b, is a hole formed in the molding portion 22 and coaxial with the hole 23b. Numeral 23 is a hole for a rotary shaft of a separate part formed of a polymer material on the base sheet metal 11, and the flat surface portion of the die, which is closer to the sheet metal surface, usually has a larger hole diameter, and the plane is farther than the sheet metal with respect to the sheet metal sheet thickness. The diameter of the hole is smaller as the distance increases, and the diameters of the upper and lower holes are the same as the mating insert parts (not shown) and are rotatable.

When a separate member (not shown) is fitted to improve the positional accuracy, the squareness, and the parallelism with high accuracy, when the above-mentioned configuration is adopted, it may not be rotatable. The shape at this time is not necessarily cylindrical.

Example 5. As an embodiment of claim 5, in FIG. 6, 11 is a base sheet metal, 24 is a molding guide portion of a polymer material which engages with the base sheet metal 11, and 24a is a molding guide portion 24.
The groove provided in the upper surface and the back surface of the sheet metal as a recess for forming in the molding provided in 32, 32 is the forming guide portion 24 formed in the base sheet metal 11.
Is a waste hole that overlaps with the periphery of or is provided at intervals around the molding guide portion. A forming guide groove 24 made of a polymer material is formed on the base sheet metal 11 integrally with a waste hole 32 penetrating the sheet metal on the outer periphery thereof.
The waste hole 32 and the waste hole 32 serve to prevent disengagement and displacement.
Further, the groove 24a provided in the forming guide portion 24 is formed so as to intersect with the longitudinal direction of the forming guide portion 24, and at least at one place, the groove 24a has the same portion as the height of the forming guide groove 24. If the molding part embedded in the waste hole c or the molding guide part 24 is damaged due to the expansion and contraction of the molding due to the temperature change of the groove 24a.
Since the width of the notch is flexible, it has the effect of holding down.

Example 6. As an embodiment according to claim 6, in FIG. 7, 11 is a base sheet metal, 25 is a forming portion engaged with the base sheet metal 11, and 25b is formed integrally with the forming portion 25 so that it can be bent within an elastic limit. The formed portion 25a is a claw integrally formed with the formed portion 25. When another member (not shown) is inserted downward from the upper portion on the inclined surface of the claw 25a, the molding portion 25b is opened due to the bending of the molding portion 25b, and the molding portion 25b is curved after the completion of the insertion.
Returns to its original state due to elasticity. In the external shape shown in FIG. 14, due to the inclination of the surface of the molding portion 26b opposite to the claw 25a, the curvature of the claw a can be remarkably increased as compared with the snap-fit shape in which molding is usually relatively low.

Example 7. As an embodiment of claim 7, in FIG. 8, 11 is a base sheet metal, 26 is a forming part engaged with the base sheet metal 11, 26c is a forming part facing the forming part 26 with a space, and 26b is a forming part. Molded portions h and 26d, which are integrally molded with the portion 26c and are partially bendable within the notch elastic limit, are formed by forming the molded portion 26 and the molded portion 26c into a rib shape in the mold insertion direction. The joined molding portion 26a is a claw that is integrally molded with the molding portion 26b and a separate member (not shown) is inserted from the bottom to the top, and comes into contact with and engages with the fitting portion of the separate member after the insertion is completed. In the conventional fitting, the molding portion 26 and the molding portion 26c are molded in such a manner that the flat surfaces face each other at a constant interval, and when they are connected on the flat surface, the flat surface portion causes a temperature difference between the upper die and the lower die of the molding die. Although the heat radiation while facing each other is different from that of the outer surface, the molding portion 26 and the molding portion 26c can be formed by forming this with one of the molds.
Since the temperature distribution between the molds receives heat from one side of the mold, the molding shrinkage becomes constant, so that the molding portions 26c and 26b are less likely to warp.

Example 8. As an embodiment of claim 8, in FIG. 9, 11 is a base sheet metal, 27 is a forming portion engaged with the base sheet metal 11, 27a is a forming hole penetrating the base sheet metal 11 provided in the forming portion 27, and 27b. Is a hole provided in the deforming direction of the molding hole 27a. Conventionally, it has been possible to cope with the need for a perfect circle, such as the molding hole 27a, by stealing the neighboring molding part over almost the entire circumference, but changing the molding of the moldings scattered around the outer circumference of the molding. That is equal to remake. Here, when the required molding hole 27a is deformed and the direction of deformation is confirmed, a simple round hole is provided in the direction of deformation.

[0054]

According to the structure of the first aspect of the present invention, the C chamfering for eliminating burrs has been conventionally performed on the punching of the sheet metal for outsert molding, and this C chamfering is performed when the design is changed due to the mold structure. , It often happens that the mold cannot be modified,
Further, since the mold is largely damaged, it is often impossible to confirm the damaged part even in the maintenance of dies and the like, and therefore it has been desired to be abolished. This time, C chamfering was abolished in this way, and the same effect was obtained by flat pressing in the next process, and there was the effect that there is no need for mold maintenance and confirmation of damage, etc. The effect is high in that it has a large degree of freedom.

According to the second aspect of the invention, it is conceivable that the outsert forming holes are scattered on the sheet metal and the sheet metal provided for increasing the rigidity has insufficient strength due to the holes. The cross-sectional area of the sheet metal is secured by providing holes with relatively low importance used to prevent slipping, misalignment, and falling of the molding scattered on the sheet metal so as to overlap with the holes required for molding. It can prevent a decrease.

According to the third aspect of the present invention, the forming boss serves as a rotating shaft and a fitting is required. When the boss shape is relatively high from the sheet metal surface, or the dimensional accuracy is very high. In this case, it may not be possible to set it if the molding shaft is inclined due to the taper of the mold due to molding, or molding cannot be taken out of the mold, etc. It is possible to easily correct at least two fitting portions near the sheet metal surface and far from the sheet metal surface, and it is possible to improve accuracy.

According to the fourth aspect of the present invention, the forming boss requires a hole for the rotating shaft or a fitting, and when the axial length of the hole shape is relatively long or the dimensional accuracy is very high. May not be set if there is an inclination in the molding hole etc. in the punching taper of the mold due to molding, or the molding cannot be removed from the mold, etc. It is possible to easily correct at least two fitting parts near the sheet metal surface and at a position far from the sheet metal surface, and it is possible to improve accuracy. available.

According to the fifth aspect of the present invention, when the outsert molding is performed with a relatively long longitudinal direction, a notch shape that partially remains in the middle with respect to the thermal expansion and contraction of the molding is formed in a proper place. By doing so, the change in expansion and contraction is absorbed in the width direction of the notch, and the molding is protected against damage due to thermal expansion and contraction.

According to the structure of claim 6, even when the under-neck size of the snap fit is relatively low, an appropriate taper is provided on the curved portion of the molding so that the amount of bending is the same thickness within the elastic deformation. It can be increased.

According to the structure of claim 7, when the plate-shaped formations formed on the sheet metal face each other in a face-to-face manner, when the plate-shaped formations are integrally molded, the mold is an upper mold while facing each other. When one of the lower molds is used and the engagement takes the form of a plate in the direction of movement of the mold, the difference in temperature distribution between the upper and lower molds and the state of heat radiation are constant, and the plates face each other. Deformation such as warpage can be suppressed to a minimum.

According to the structure of claim 8, the roundness of the forming hole is required, and when another forming is performed around the forming hole, the forming portion is covered with a certain amount or more of the sheet metal surface. The molding hole, which should be a perfect circle, is pulled by the surrounding molding portion due to heat shrinkage and deforms, but it is difficult to specify the deformation direction. When a deformation is confirmed, a relatively small hole is formed in the deformation direction without penetrating the sheet metal, so that the force of pulling the forming hole is a deformation of the hole that does not penetrate the sheet metal and a perfect circle can be formed.

[Brief description of drawings]

[Figure 1] Top view of outsert molding

[Figure 2] Side sectional view of sheet metal drilling

FIG. 3 is a top view of the molding shape

FIG. 4 is a side sectional view of a molding shaft.

FIG. 5 is a side sectional view of a molding hole.

FIG. 6 is a side sectional view of a molding hole.

FIG. 7 is a top view of the molding shape in the longitudinal direction.

FIG. 8 is a perspective view of a forming claw.

FIG. 9 is a top view of the molding shape.

FIG. 10 is a side sectional view of a conventional sheet metal hole

FIG. 11 is a top view of a conventional molding shape.

FIG. 12 is a side sectional view of a conventional molding shaft.

FIG. 13 is a side sectional view of a conventional molding hole.

FIG. 14 is a front view and a side sectional view of a conventional molding claw.

FIG. 15 is a perspective view of a conventional molding claw.

FIG. 16 is a top view of a conventional molding shape.

[Explanation of symbols]

 10 Molded shape 11 Base sheet metal 11a Burr 21 Molded part 22 Bearing surface 22a Shaft 22b Shaft 23 Fixed molded part 23a Shaft hole 25 Fixed molded part 25a Claw 25b Plate part 26 Fixed molded part 26a Claw 26b Plate part 26c Positioning 26d Joint 27 Fixed Molding part 27a Positioning hole 28 Lower mold 29 Upper mold 30 Work piece 31 Waste hole 32 Waste hole

Claims (8)

[Claims] 1. A shaft formed of a polymer material on a sheet metal,
In the sheet metal for outsert forming that constitutes the hole, receiving surface, etc., the processing direction of the press working such as punching of the sheet metal is almost unified, and burrs such as drilling are made in the next step after the punching. A sheet metal for outsert molding, which is characterized by removing burrs by pressing on a flat surface at the time of opening or bending. 2. A peeling or drop-prevention hole such as a molding boss or a hole formed of a polymer material is formed on a sheet metal so as to overlap with a hole of a molding section, and is formed at least as a peel-off or drop-prevention hole. The sheet metal for outsert molding, wherein the dimension of the molding is larger than the width overlapping the hole of the molding part. 3. An outsert forming member formed of a polymer material on a metal plate, wherein an outsert forming shaft having different upper and lower shaft diameters coaxial with the formed protruding cylindrical shaft is provided. An outsert forming member characterized by having. 4. An outsert molding member formed of a polymer material on a sheet metal, characterized in that the diameter of the upper and lower holes coaxial with the formed cylindrical hole for the shaft is different. Outsert molded parts to be. 5. An outsert molding member formed of a polymer material on a sheet metal, which is suitable when a polymer material is molded into a hole provided on the sheet metal and having a size larger than a certain length in the longitudinal direction. An outsert molding member, characterized in that grooves having a shape in which a width is curved on a plane in a height direction from a sheet metal surface to a height of a molding portion are provided at various intervals. 6. An outsert molding member formed of a polymeric material on a sheet metal, which has a structure in which another member is detachably held by utilizing bending of molding, and the nail is made of a polymeric material. In the case of a shape that holds the outsert, an outsert provided with a gradient from the root of the plate-shaped bending portion to the tip of the claw that causes the claw to flex as much as the hanging allowance with respect to the other member An outsert forming member having a molded snap fit. 7. An outsert molding member formed of a polymer material on a sheet metal, which has a structure in which another member is detachably held by utilizing bending of molding, and has a nail shape of the polymer material. When it is on the back surface of the claw shape with a different shape such as the box shape in the bending direction of the claw, with a configuration that consists of a part that holds it and a box-shaped part that has a different shape for the purpose of fixing. The outsert molding member, characterized in that the engagement of is provided in the direction of bending. 8. In an outsert molding member formed of a polymer material on a sheet metal, when the whole circumference of the sheet metal hole is molded with a molded product to form a relatively thin round hole, the thickness of the round hole is set to the sheet metal. An outsert molding member characterized in that a round hole lower than the required height of the molded product and the height to the sheet metal surface is provided on the surface.