JP2005052947A - General-purpose loading platform and workpiece carrying device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a general-purpose loading platform which allows a workpiece of a different shape to be mounted thereon, and is usable over a long period of time without forming scratches, dents, etc. in the workpiece, and also to provide a workpiece carrying device using the general-purpose loading platform. <P>SOLUTION: The general-purpose loading platform 1 having a recess 3a formed therein is placed below a hydraulic cylinder 8 to which a workpiece mold 7 is fixed, and the workpiece mold 7 is pressed to the recess 3a by the hydraulic cylinder 8. Then the workpiece mold 7 is pulled up by the hydraulic cylinder 8, and therefore a shape of a workpiece mounting surface is formed in inclined surfaces of the recess 3a. In this manner, the shape of a workpiece mounting portion 3 is varied depending on different shapes of different workpieces, and therefore workpieces of different shapes are mounted on the loading platform. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a general-purpose cargo bed on which a workpiece such as a part of a vehicle is placed, and a workpiece transfer device using the same.

  2. Description of the Related Art Conventionally, in a factory line where various processing is performed while transporting a workpiece, the workpiece is sent to a predetermined processing area by fixing or placing the workpiece on a workpiece transport jig and transporting the workpiece by a transport conveyor. . At this time, in order to hold the workpiece being conveyed in a stable state, the fixed portion or the placement portion of the workpiece conveyance jig is formed in accordance with the shape of the workpiece.

  By the way, depending on the factory, the shape of the work flowing through the line may not be constant. For example, in a vehicle assembly factory of a multi-model mixed production line, various parts are assembled depending on the model. At this time, since the shape varies depending on the parts, for example, when using a loading platform as a work conveying jig, the shape of the loading section of the loading platform must be formed according to the shape of various components, A large number of cargo beds are required. For this reason, there was a problem that the manufacturing cost of the loading platform increased.

  In addition, since a large number of loading platforms corresponding to the shape of each workpiece are stored, a considerable area is required in the storage location, and furthermore, there is a problem in that it takes time to search for the intended loading platform in the storage location. . In addition, if the model is discontinued, the loading platform that is no longer needed can be discarded, or only the loading part of the loading platform can be discarded and then replaced with the loading part for the new model for reuse. In any case, however, there is a problem that the environmental load becomes excessive and the man-hour and the cost increase.

In order to solve the problems as described above, for example, Patent Document 1 describes an invention relating to a cargo bed in which a large number of rod-shaped receiving members are provided on a work placing portion. The receiving members are respectively urged upward by separately provided urging means, and when the work is placed, only the receiving members in contact with the work are lowered against the urging force. . Furthermore, since the position of the receiving member in the vertical direction is fixed by the excitation means provided separately while the workpiece is placed, the workpiece can be held in a stable state. Such a loading platform can be applied to workpieces of various shapes by changing the vertical position of each receiving member.
JP-A-2-303771 (second page, upper left column, line 1 to page 3, upper right column, line 14; FIGS. 1 to 6)

However, when the loading platform described in Patent Document 1 is used, when the workpiece is placed on the receiving member, the receiving member partially pushes up the lower surface of the workpiece, so that stress is applied to the lower surface of the workpiece in contact with the receiving member. For example, in the case of resin parts such as a bumper of a vehicle, scratches, dents, and the like are generated on the surface of the workpiece.
In addition, when a spring is used as the biasing means, the spring's resilience is reduced and the workpiece is placed in a stable state if it is repeatedly used against a heavy workpiece such as a battery, rear suspension, or tire assembly. Therefore, there is a problem that the workpiece falls or a dent or the like is generated during the conveyance.
Although it is conceivable to use an air cylinder instead of the spring, air leakage occurs due to long-term use, and the same problem as when using a spring occurs. Furthermore, in the case of an air cylinder, the number of arrangements per unit area is smaller than that of a spring due to the device configuration, so that more stress is concentrated on the lower surface of the work contacting the receiving member, and the work surface is scratched. Scratches and the like are more likely to occur.

  The present invention provides a general-purpose cargo bed that can be used for a long period of time without causing scratches, dents, or the like on a workpiece, and a workpiece transfer device using the same. The purpose is to do.

  The invention described in claim 1 of the present invention that has solved the above problem is a general-purpose cargo bed having a frame body and a work placement portion provided in the frame body, wherein the work placement portion is formed. It is characterized by using a composition that softens at 50 to 130 ° C. as a material, can be freely deformed in accordance with the shape of the workpiece in this softened state, and solidifies by returning to 50 ° C. or lower. To do.

  In the general-purpose cargo bed according to the first aspect, since the workpiece placement portion can be deformed according to the shape of the workpiece, workpieces of various shapes can be placed and transported. Moreover, even if the surface of the workpiece mounting portion is damaged due to use, it can be easily deformed and can be easily returned to its original state. Thereby, it can be used for a long time.

  Moreover, the invention described in claim 2 is the general-purpose cargo bed described in claim 1, wherein the composition improves the formability when the petroleum resin component and the work placement portion are deformed. And a filler for ensuring the rigidity of the workpiece mounting portion.

In the general cargo bed as claimed in claim 2, since the petroleum-based resin component is used, it can be placed and transported without generating scratches, dents or the like on the workpiece.
Moreover, when the said composition is used, the moldability at the time of deform | transforming a workpiece mounting part and the rigidity of the workpiece mounting part after shaping | molding improve.

  Moreover, in the general purpose carrier according to claim 2, the petroleum resin component is any one of a C5 resin component, a C9 resin component, a C5 / C9 copolymer resin component, or a dicyclopentadiene resin component. A petroleum resin component, wherein the modifier is one using fatty acid, fat or wax, and the filler is a filler containing iron tetroxide and talc. In particular, the effects of the present invention can be exhibited (claims 3 to 5).

  Moreover, in the general purpose carrier according to any one of claims 2 to 5, when the total mass of the composition is 100% by mass, the ratio of each forming material (hereinafter, “%” representing the ratio is , The mass ratio of each material when the total mass of the composition is 100%) is 40-50% of the petroleum resin component, 4-7% of the modifier, and the filling The effect of the present invention can be exerted particularly when the material is 43 to 56% (claim 6).

  In addition, the invention described in claim 7 includes a work carry-in part and a carry-out part, and a transport conveyor, and transports the work using the general-purpose cargo bed according to any one of claims 1 to 6. A heating unit that heats the composition of the workpiece placement unit to a softening temperature or higher in order from the carry-out unit toward the carry-in unit along the conveyance conveyor; and the workpiece placement A workpiece shape forming section that deforms the shape of the section in accordance with the shape of the workpiece, and a cooling section that cools the composition of the workpiece placement section to a solidification temperature or less.

  In the transfer apparatus as claimed in claim 7, the work placement portion can be processed in a series of flow operations along the transfer conveyor. Therefore, particularly in a production line in which the shape of the transferred work is frequently changed, the work efficiency is improved. Can be achieved.

  Moreover, the invention described in claim 8 is the transfer device described in claim 7, wherein a recess forming part is formed between the heating part and the work shape forming part in the work placing part. Is provided.

  In the transport apparatus as defined in claim 8, after forming the concave portion in the workpiece mounting portion, the shape of the workpiece is transferred to the wall surface of the concave portion. Even when the amount is small, the shape of the workpiece mounting portion can be deformed according to the shape of the workpiece. Thereby, the versatility of a general purpose loading platform increases.

According to the general-purpose loading platform as described above, workpieces of various shapes can be placed, and can be used for a long period of time without causing scratches, dents, or the like on the workpiece.
In addition, according to the transfer device as described above, work efficiency can be improved in a production line in which the shape of the workpiece to be transferred is frequently changed.

Next, an embodiment of a general-purpose cargo bed according to the present invention and a workpiece transfer apparatus using the same will be described with reference to the drawings as appropriate.
First, a general-purpose loading platform according to an embodiment of the present invention will be described with reference to FIG. 1 showing a process of deforming the shape of a workpiece placement unit.

As shown in FIG. 1, the general-purpose loading platform 1 of the present invention has a frame body 2 and a work placing portion 3 provided in the frame body 2. The material which forms the frame 2 should just be a material which has heat resistance, for example, an iron material etc. can be used conveniently. The material for forming the work placement portion 3 is softened at 50 to 130 ° C., and in this softened state, it can be freely deformed according to the shape of the work and is solidified by returning to 50 ° C. or lower. A composition is used. When the softening temperature is less than 50 ° C., there is a risk of softening when used at high temperatures in summer. On the other hand, if it exceeds 130 ° C., an expensive heating device is required for softening, and the utility cost is increased, and furthermore, the workpiece placement unit 3 can be deformed according to the shape of various workpieces. It becomes difficult.

  The composition includes a petroleum-based resin component, a modifier for imparting viscosity in order to improve moldability when deforming the workpiece placement portion 3, and a rigidity for securing the workpiece placement portion 3. It is preferable to use one containing a filler.

As the petroleum resin component, any one of the C5 resin component, the C9 resin component, the C5 / C9 copolymer resin component, or the dicyclopentadiene resin component is suitable. In particular, a C5 resin component having a softening temperature of 50 to 70 ° C. is optimal in terms of moldability.
As the modifier, it is preferable to use any one of fatty acids, fats and oils, and waxes. When using a fatty acid, oleic acid, linoleic acid, tall oil fatty acid and the like are preferable. When using fats and oils, soybean oil, rapeseed oil, linseed oil and the like are suitable. When wax is used, paraffin wax, microwax, α-olefin wax, chlorinated paraffin wax and the like are suitable. Of these, paraffin wax and microwax are most suitable.
As the filler, those containing triiron tetroxide and talc are suitable.

In addition, when a material including a petroleum resin component, a modifier, and a filler is used as a forming material of the composition, the petroleum resin component is 40 to 50%, the modifier is 4 to 7%, It is preferable to blend so that the filler is 43 to 56%.
If the modifier is less than 4%, sufficient viscosity cannot be obtained and the moldability is poor. On the other hand, when it exceeds 7%, the viscosity becomes excessive, and it becomes easy to adhere to a work mold imitating the shape of the work mounting surface at the time of molding to be described later. Inferior to
If the filler is less than 43%, sufficient rigidity cannot be obtained, so that the fluidity of the composition is increased during molding. As a result, the resin flow occurs at the transfer surface end of the workpiece mounting portion 3 when the workpiece mold is transferred, and the moldability is poor. Furthermore, since the transfer surface is soft when releasing the work mold, the components of the composition are likely to adhere to the work mold, resulting in poor release characteristics. On the other hand, when the filler exceeds 56%, the rigidity is excessive and the moldability is poor.

Next, with reference to FIGS. 1 to 4, a method of deforming the workpiece placement unit 3 according to the shape of the workpiece will be described.
First, the said composition which forms the workpiece | work mounting part 3 is heated to the softening temperature or more with the heating apparatus which is not illustrated. At this time, since it is necessary to heat evenly to the inside of the workpiece placing unit 3, it is preferable to use a heating device that heats by far infrared rays. Next, as shown in FIG. 1, the concave forming die 5 fixed to the tip of the hydraulic cylinder 4 is pressed against the general-purpose cargo bed 1 by the hydraulic cylinder 4 [FIG. 1 (a) → FIG. 1 (b)]. Here, as shown in FIG. 2 which is an AA cross-sectional view of FIG. 1B, the workpiece mounting portion 3 is transferred to the shape of the pressing surface of the recess forming die 5. At this time, the recess forming die 5 is kept warm by the heater 6 at the softening temperature of the composition. Thereby, it can transfer to the following process (process to deform | transform according to the shape of a workpiece | work), without hardening the transfer surface of the workpiece mounting part 3. FIG.
Subsequently, the recess forming die 5 is pulled up by the hydraulic cylinder 4 [FIG. 1 (b) → FIG. 1 (c)], so that the recess 3a is formed in the workpiece mounting portion 3.

Next, the general purpose loading platform 1 in which the recess 3a is formed is placed below the hydraulic cylinder 8 to which the work mold 7 is fixed [FIG. 3 (a)], and the work mold 7 is pressed against the recess 3a by the hydraulic cylinder 8. [FIG. 3 (a) → FIG. 3 (b)]. Here, as shown in FIG. 4 which is a BB sectional view of FIG. 3B, the inclined surface 3 b of the recess 3 a is transferred to the shape of the pressing surface of the work die 7. At this time, the work mold 7 is cooled to a temperature equal to or lower than the solidification temperature of the composition by the coolant supplied to the cooling pipe 9. Thereby, the resin flow to the inclined surface 3b from the convex part 3c produced by the press of the workpiece | work type | mold 7 can be prevented.
Subsequently, by pulling up the work mold 7 with the hydraulic cylinder 8 [FIG. 3 (b) → FIG. 3 (c)], the shape of the work mounting surface is formed on the inclined surface 3b (see FIG. 4) of the recess 3a. It is formed. Thereby, even when the amount of the composition is small with respect to the size of the workpiece, the shape of the workpiece mounting portion 3 can be deformed in accordance with the shape of the workpiece, so that the versatility of the universal platform 1 is enhanced.
Subsequently, the composition is cooled to a solidification temperature or lower by a cooling device (not shown) and cured. At this time, it is necessary to sufficiently cool the inside of the work placing unit 3.

  The corresponding workpiece W is placed on the general-purpose carrier 1 thus obtained as shown in FIG. And if the shape of a workpiece | work changes, the shape of the workpiece | work mounting part 3 will be similarly deform | transformed according to the shape. Thereby, the workpiece | work of various shapes can be mounted and conveyed.

The material for forming the recess forming die 5 and the work die 7 may be any material having heat resistance. For example, an iron material, a copper material, an aluminum material, or the like can be suitably used. Further, in FIGS. 1 and 3, for the sake of easy understanding, the vertical strokes relative to the size of the pressing mold are drawn larger than the actual ones.
Moreover, the deformation | transformation method of the workpiece | work mounting part 3 is not limited to the said method. For example, in the above method, after the recess 3a is formed on the workpiece mounting portion 3, the workpiece mold 7 is pressed and the shape of the workpiece is transferred, but the shape of the workpiece is directly transferred without forming the recess 3a. Also good.
Further, the general-purpose cargo bed is not limited to the above embodiment. For example, the shape of the bottom surface of the frame may be a circle instead of a rectangle.

  Next, an embodiment of the transfer apparatus of the present invention will be described with reference to FIG. FIG. 6 is a schematic view showing a transport apparatus according to an embodiment of the present invention. The conveying apparatus 10 of the present invention is a conveying apparatus that conveys a work using the above-described general-purpose loading platform 1, and includes a work carry-in part 11, a carry-out part 12, and a conveyer 13, as shown in FIG. A heating unit 14 that heats the composition of the workpiece placement unit 3 to a softening temperature or higher with a heating device (not shown) in order from the carry-out unit 12 to the carry-in unit 11 along the transport conveyor 13; As shown in FIG. 1, the concave portion forming portion 15 that forms the concave portion 3 a in the central portion of the softened workpiece placement portion 3, and the shape of the workpiece placement portion 3 is matched to the shape of the workpiece as shown in FIG. 3. A workpiece shape forming unit 16 to be deformed and a cooling unit 17 that cools the composition of the workpiece mounting unit 3 to a solidification temperature or lower by a cooling device (not shown).

  When the work is transported by the transport device 10, the general-purpose cargo bed 1 is transported along the transport conveyor 13 from the heating unit 14 to the cooling unit 17, and in the meantime, similarly to the above-described method, the work placing unit 3 is deformed in accordance with the shape of the workpiece to be conveyed. Next, the corresponding work is placed in the carry-in unit 11. And in the case of the production line which assembles | assembles various components to a workpiece | work, a workpiece | work is conveyed by the conveyance conveyor 13 to the assembly area 18, and components are assembled | attached. The work for which assembly has been completed is transported along the transport conveyor 13 to the unloading unit 12, and the work is unloaded at the unloading unit 12.

Then, when conveying the same workpiece | work, without deform | transforming the workpiece | work mounting part 3, the general purpose carrier 1 is conveyed along the conveyance conveyor 13 to the carrying-in part 11, and as mentioned above, a workpiece | work is a general purpose carrier 1 is transported in a state where it is placed on 1.
If the shape of the workpiece changes, similarly, the workpiece placement unit 3 is deformed according to the shape and conveyed. Thereby, work efficiency can be improved in the production line in which the shape of the workpiece is frequently changed.

  In addition, the conveying apparatus of this invention is not limited to the said embodiment. For example, you may make it convey directly to a workpiece | work shape formation part from a heating part, without providing a recessed part formation part. In addition, if a blow device for removing dust accumulated on the general-purpose cargo bed 1 during work transfer is installed between the carry-out unit and the heating unit, it is possible to prevent foreign matter from being mixed into the composition. The durability of the general-purpose loading platform 1 is improved.

  Examples of the present invention will be described below. In addition, this invention is not limited to this Example.

  As a material for forming the work placement unit 3, a composition including a petroleum resin component, a modifier, and a filler was used. As the petroleum resin component, a C5 resin component was used for Examples 1 and 2, and a C9 resin component was used for Examples 3 and 4. The details of petroleum resin components and other forming materials shown in Table 1 were used.

  Regarding the blending method of the composition, first, the petroleum-based resin component, the modifying material, and the filler were weighed so that the blending ratio (mass ratio) of each material was a value shown in Table 2. Next, after the petroleum resin component was completely melted at around 200 ° C., the modifier was added and sufficiently stirred, and further, the filler was added and sufficiently stirred.

The obtained composition was poured into the frame 2 (see FIG. 1), 60 ° C. for Examples 1 and 2 using a C5 resin component, and 90 for Examples 3 and 4 using a C9 resin component. Cooled to ° C. Subsequently, as shown in FIG. 1, the concave forming die 5 was pressed against the composition (pressure: 2 kg / cm ² ), and cooled to 30 ° C. in this pressed state. Thereafter, the concave portion forming mold 5 was released, and the moldability at that time and the moldability of the composition were judged by ○ ×. The results are shown in Table 2.

  As shown in Table 2, each of Examples 1 to 4 is a No. 1 in the condition range defined in claim 6 of the present invention. 5-7, no. 10-12, no. When the blending ratio was 15 to 17, good results in moldability and releasability were exhibited (both “◯”).

On the other hand, the ratio of the filler falls outside the upper limit value of the condition range defined in claim 6 described in the claims. No. 2, 3 and No. in which the ratio of the modifier is out of the lower limit value of the condition range defined in claim Nos. 9, 14 and No. 6 in which the ratio of the filler deviates from the upper limit value of the condition range defined in claim 6 and the ratio of the modifier deviates from the lower limit value of the condition range defined in claim 6. About 1 and 4, the formability deteriorated in any of Examples 1 to 4 ("x"). Moreover, the ratio of the reforming material deviates from the upper limit value of the condition range defined in claim 6. About 3, 8, 13, 18 about any of Examples 1-4, the mold release property deteriorated ("x").
Further, the ratio of the filler deviates from the lower limit value of the condition range defined in claim 6 described in the claims. About 19-21, in any of Examples 1-4, both moldability and mold release property deteriorated (both "x").
As described above, when a petroleum-based resin component, a modifier, and a filler are used as the material for forming the workpiece mounting portion 3, each material is used at a ratio in the condition range defined in claim 6 of the present invention. Is preferably blended.

It is a figure which shows the process of forming a recessed part by pressing the recessed part formation type | mold to the workpiece | work mounting part of the general purpose carrier which concerns on one Embodiment of this invention, (a) is before pressing, (b) is pressing (C) shows after pressing. It is AA sectional drawing of FIG.1 (b). It is a figure which shows the process of forming the shape of the mounting surface of a workpiece | work by pressing a workpiece | work type | mold to the workpiece mounting part of the general purpose loading platform which concerns on one Embodiment of this invention, (a) is before pressing, (b ) Is during pressing, and (c) is after pressing. It is BB sectional drawing of FIG.3 (b). It is a whole perspective view of the general purpose loading platform which concerns on one Embodiment of this invention which mounted the corresponding workpiece | work. It is a schematic diagram which shows the conveying apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 General purpose loading platform 2 Frame 3 Work place part 3a Concave part 10 Conveyance apparatus 11 Carry-in part 12 Carry-out part 13 Conveyor 14 Heating part 15 Concave formation part 16 Work shape formation part 17 Cooling part W Workpiece

Claims (8)

A general-purpose cargo bed having a frame body and a work placement portion provided in the frame body,
A composition that softens at 50 to 130 ° C. as a material for forming the workpiece mounting portion, and can be freely deformed in accordance with the shape of the workpiece in this softened state, and solidifies by returning to 50 ° C. or lower. General-purpose cargo bed characterized by using The composition comprises a petroleum resin component,
A modifier for imparting viscosity in order to improve formability when deforming the workpiece placement section;
The general purpose carrier according to claim 1, further comprising a filler for securing rigidity of the work placement unit.   The petroleum resin component is any one of a C5 resin component, a C9 resin component, a C5 / C9 copolymer resin component, or a dicyclopentadiene resin component. Item 3. The general-purpose carrier according to Item 2.   The general purpose carrier according to claim 2 or 3, wherein any one of fatty acids, fats and oils, and waxes is used as the modifying material.   The general purpose carrier according to any one of claims 2 to 4, wherein the filler includes triiron tetroxide and talc. When the total mass of the composition is 100% by mass, the ratio of each forming material is as follows:
The petroleum resin component is 40-50% by mass,
4 to 7% by mass of the modifying material,
The general purpose carrier according to any one of claims 2 to 5, wherein the filler is 43 to 56 mass%. It has a carrying-in part and a carrying-out part of a work, and a conveyance conveyor, and is a conveyance device which conveys a work using the general purpose loading platform according to any one of claims 1 to 6,
Along the transport conveyor, from the carry-out unit toward the carry-in unit,
A heating unit that heats the composition of the workpiece placement unit to a softening temperature or higher;
A workpiece shape forming portion that deforms the shape of the workpiece placement portion according to the shape of the workpiece; and
And a cooling unit that cools the composition of the workpiece mounting unit to a solidification temperature or lower. The conveying apparatus according to claim 7, wherein a recess forming part that forms a recess in the work placing part is provided between the heating part and the work shape forming part.

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