JP6416151B2 - Treatment instrument and surface treatment method thereof - Google Patents

Description

  The present invention relates to a processing instrument used for various types of processing such as processing of a processed object such as food, and more specifically, a metal processing used in contact with the processed object in a food processing or food production line or the like. It relates to equipment.

  In processing (production) lines such as powdered, granular or pasty chemicals, foods, and luxury products such as instant coffee, for example, powdered, granular or pasty substances (medicines, foods, etc.) (Also referred to as an object or an object to be processed) in a hopper, and a powdery or granular substance is taken out of the hopper and weighed (measured to a predetermined amount) while being mixed with other substances in a downstream process, Alternatively, various processes such as bagging are performed.

  However, some workpieces are likely to adhere to each other or in contact with each other (such as the inner wall of the hopper). In the case of such workpieces that are likely to adhere, they are stored in the hopper, for example. Due to the phenomenon that the inside of the workpiece becomes hollow (so-called arching phenomenon), the workpiece is not supplied to the screw conveyor or the like below the hopper, which hinders the supply and conveyance of the workpiece to the downstream process. There was a problem of coming.

  For this reason, conventionally, it is necessary to provide a stirring means in the hopper, or to prevent the workpiece from adhering to the inner wall of the hopper and growing in an arch shape, the Teflon (registered trademark) is provided on the inner surface of the hopper. ) It has been performed to make it difficult for the workpiece to adhere by applying a coating (Patent Document 1).

Japanese Patent Laid-Open No. 06-273318

  However, when a stirring means is provided in the hopper, the equipment becomes more sophisticated and complicated, resulting in increased costs and problems such as vibration and noise, as well as increased component elements such as bearings. There is a fact that there is a high risk of being mixed into the product.

  Further, as described in Patent Document 1, when Teflon coating is applied to the inner wall of a hopper, a material different from the base material is formed on the surface of the metal material that is the base material of the hopper. Therefore, there is a concern that the coating layer may be peeled off from the base material due to some impact or deterioration, and mixed into the workpiece, and there is a need for a technique that does not cause such peeling. There is a real situation.

The present invention has been made in view of such circumstances, and has a relatively simple and low-cost configuration, and there is no possibility of contamination due to peeling or the like, and a treatment instrument on which an object to be treated is difficult to adhere and a surface treatment method thereof The purpose is to provide.

For this reason, the processing instrument according to the present invention is:
It is a metal processing instrument that comes into contact with an object to be processed which is a powdery, granular or pasty substance ,
At least in the area that comes into contact with the workpiece ,
A plurality of minute recesses that are recessed into a spherical shape and have an inlet diameter of φ10 to φ30 μm and a depth of 0.5 to 3 μm are formed.

  In the present invention, the processing tool may be a hopper that accommodates an object to be processed.

  In the present invention, the processing instrument may be a chute that slides down an object to be processed.

  In the present invention, the processing instrument may be a frying pan or a pan.

In this invention, the said to-be-processed object can be a foodstuff or a chemical | medical agent, It can be characterized by the above-mentioned.
A surface treatment method for a treatment instrument according to the present invention is as follows .
A surface treatment method for a metal processing tool that comes into contact with an object to be processed which is a powdery, granular or pasty substance,
At least in the area that comes into contact with the workpiece,
A plurality of concave portions recessed into a spherical shape and having an inlet diameter of φ10 to φ30 μm and a depth of 0.5 to 3 μm are formed.

ADVANTAGE OF THE INVENTION According to this invention, although it is a comparatively simple and low-cost structure, there is no possibility of mixing of the foreign material by peeling etc., and the processing tool and its surface treatment method with which a to-be-processed object cannot adhere easily can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the whole structure of an example of the processing instrument (The hopper which carries out a to-be-processed object from an upper opening, and unloads it from a lower opening, which concerns) Example 1 of this invention. It is a perspective view showing roughly an example of a plurality of minute dimples (minute recesses) formed in a metal product by WPC processing. It is a perspective view which shows the whole structure of an example of the processing instrument (chute | shoot) which concerns on Example 2 of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments described below.

  As an example of a processing tool (processing tool) according to Example 1 of the present embodiment (processing: concept including transport, accommodation, sliding off, etc. other than processing), for example, as shown in FIG. Alternatively, the inner peripheral surface 11 of the accommodating portion 10 of the hopper 1 which is a container for accommodating a paste-like substance (workpiece, workpiece) is subjected to WPC treatment instead of Teflon coating or the like to perform fine dimples (spherical shape) An infinite number of depressed microscopic concaves and microscopic concaves and convexes are formed (see FIG. 2). The hopper 1 is a tool (processing tool) that loads a workpiece (processing object) from the upper opening and unloads it from the lower opening while temporarily storing it.

  Here, WPC (Wide Peening and Cleaning) is a surface treatment called “fine particle peening”, “precision shot peening”, “FPB (Fine Particle Bombarding)”, etc. This is a surface modification process in which fine particles of a corresponding material are mixed with a compressible gas and collided at high speed.

  In WPC processing, rapid heating and quenching are repeated on the outermost surface of the WPC processing object, while multi-directional, multi-stage, and asynchronous strong processing is introduced in a local region of the material surface, so that it is fine and rich in toughness. There has been conventionally known an effect that a dense structure is formed, the hardness is increased and the surface is strengthened, and at the same time, the frictional wear characteristics can be improved by changing the surface properties to fine dimples.

  Further, for example, by performing WPC processing on the sliding portion (cam, cam follower, gear tooth surface, outer peripheral surface of the piston skirt portion of the internal combustion engine, etc.), a number of minute dimples formed by this WPC processing can be obtained. Since it can function as an oil reservoir, there has been conventionally known an effect of improving initial conformability, wear resistance, scuff resistance, and the like.

  On the other hand, when the present inventors have formed minute dimples on the metal surface by the WPC process through various experimental studies and trials, the effects obtained by the conventionally known WPC process as described above are obtained. It has been found that it has a different and distinct effect.

  That is, when fine dimples are formed on the surface of a processing tool (processing tool) by WPC processing, the workpiece (processing object) such as powder, granule, or paste is formed on the surface of the processing tool (processing tool). Since the first contact with the formed convex part and the concave part separate from the workpiece, the contact area as a whole is reduced and the adhesive force is reduced, so that the workpiece (the workpiece) is processed. The knowledge that there exists an effect (characteristic) that it becomes difficult to adhere to the surface of an instrument (processing instrument) was obtained.

  Further, even if the workpiece (processing object) adheres to the surface of the processing tool (processing tool), the workpieces (processing object) adhere to each other and grow inward (in the length direction). Growth) and lateral growth (thickness growth), since there is a recess around the convex part, the surface of the processing tool (processing tool) grows laterally (thickness direction) Therefore, even if the work piece (processed object) adheres and grows in the length direction, it will not be able to support the weight and will fall off and suppress the growth of the adhering substance. The knowledge that there is a function effect (characteristic) that it is difficult to generate a phenomenon (so-called arching phenomenon) that the inside grows into an arch shape and becomes a hollow inside (so-called arching phenomenon). Got.

  Based on such knowledge, the inventors have formed minute dimples (minute recesses and minute irregularities) on the surface of a processing tool (processing tool) with which the workpiece (processing object) comes into contact. It is difficult to adhere the object (processed object) and avoids problems such as contamination of foreign matter due to the drop of the conventional Teflon coating layer. The problem of adhesion of processed materials to processing tools (processing tools) can be solved.

  For this reason, in Example 1, minute dimples (minute recesses) are formed on the inner peripheral surface 11 of the housing portion 10 with which the workpiece (workpiece) of the metal hopper 1 as shown in FIG. Were formed (see FIG. 2).

  In Example 1, the size of the micro dimple (micro concave portion) 100 shown in FIG. 2 has an inlet diameter of about φ5 to φ100 μm (preferably about φ10 to 30 μm) and a depth of 0.5 to 3 μm (preferably , About 1-2 μm).

In addition, as a WPC process, the heat processing method (WPC process) of the metal product described in the patent 5341971 is applicable, for example.
Specifically, it is performed by injecting a shot (a ball having a small particle size) from an injection apparatus as described below and colliding with a WPC processing target.

[Injection device]
In the WPC process according to the present invention, a shot is jetted by a known blasting device to collide with the surface of a metal product.

  For example, various types of pneumatic blasting devices can be used. For example, compressed air is supplied into a tank into which shots are charged, and shots conveyed by the compressed air are separately provided. Direct pressure type blasting device that injects from a blast gun in an air flow of compressed air, gravity type blasting device that injects a shot dropped from a tank onto compressed air, and shots by negative pressure generated by the injection of compressed air Various blasting apparatuses such as a suction blasting apparatus that sucks and injects the compressed air together with compressed air can be used.

〔shot〕
The shot used in the present invention has a hardness equal to or higher than that of a metal product to be processed by WPC, and has a JIS abrasive particle size in the range of # 100 to # 800 (average particle size: 149 μm to 200 μm) according to the purpose. Then, beads (alumina silica beads, high speed beads, etc.) mixed with three or more approximate particle sizes are used. The approximate particle size is a particle size within the above range.

  With the above-described injection device, the shot (group) is mixed with compressed air, the injection pressure is 0.3 to 0.6 MPa, the injection speed is 100 to 200 m / sec, the injection distance is 100 mm to 250 mm, and 0.1 to 1 second. Intermittent injection. That is, injection of 0, 1 to 1 second is preferably performed repeatedly at intervals of 0.5 to 5 seconds, and the diameter φ5 to the surface of the WPC processing target (processing tool, processing tool) Innumerable micro dimples (innumerable micro concave portions recessed in a spherical shape) having a diameter of about 100 μm (preferably about 10 to 30 μm) and a depth of 0.5 to 3 μm (preferably about 1 to 2 μm) are formed.

  By such WPC processing, minute dimples are formed on the inner peripheral surface 11 (region in contact with the workpiece (processed object)) of the hopper 1 that stores the processed object (processed object) in the processing or production line of food or the like. By forming the workpiece, it is possible to suppress the workpiece (the workpiece) from adhering to the inner peripheral surface of the hopper 1.

  Therefore, the work piece (processed object) adheres to the inner peripheral surface 11 of the hopper 1 as in the past, so that it is possible to suppress the occurrence of defective supply of the work object to the downstream process. Further, since there is no conventional coating layer such as Teflon coating, it is possible to avoid the possibility of foreign matter contamination due to peeling or the like.

  In addition to the hopper 1, for example, a micro concave portion (micro unevenness) is formed on the screw surface (a region in contact with the workpiece) of a screw conveyor that is installed in the lower portion of the hopper 1 and conveys the workpiece to a downstream process by WPC processing. ) Can be prevented from adhering to the workpiece, and poor conveyance to the downstream process can be suppressed.

  Further, for example, as shown in FIG. 3, the surface (region in contact with the workpiece) such as a chute 20 (slide-like element) for sliding the workpiece conveyed by a screw conveyor or the like onto a weighing device or the like. By forming the minute recesses (minute irregularities) on the 21 by the WPC process, it is possible to suppress adhesion of the workpiece.

  In other words, according to the first embodiment, the surface of the processing tool (processing tool) that comes into contact with the workpiece (processing object) in the processing or production line of food or the like (the area in contact with the processing object (processing object)). ) To prevent the workpiece (workpiece) from adhering to the processing tool while avoiding the possibility of foreign matter contamination due to peeling of the Teflon coating layer, etc. It is possible to suppress the occurrence of defective supply of the workpiece (processed object) to the downstream process and contribute to the improvement of the production efficiency.

  In addition, the processing equipment for processing lines (processing equipment) such as hopper can be made of metal (alloy) such as iron, aluminum, titanium, etc. In the case of iron, in addition to steel (SS400, etc.) It can be made of stainless steel, and in particular, nonmagnetic austenitic stainless steel (SUS303, 304, 316, etc.).

  In the first embodiment, processing tools (processing tools) used for processing food products or production lines are targeted, but in the second embodiment, they are applied to household processing tools (processing tools, cooking tools). An example will be shown.

  In Example 2, for example, on a cooking surface (inner peripheral surface) of a pan or a frying pan (made of aluminum, iron, stainless steel, titanium, etc.), a diameter of about φ5 to φ100 μm (preferably about φ10 to 30 μm) by WPC treatment, Innumerable micro dimples (innumerable micro concave portions recessed into a spherical shape) having a depth of 0.5 to 3 μm (preferably about 1 to 2 μm) are formed. The WPC processing method can be the same as in the first embodiment.

  According to the second embodiment, it is possible to prevent food and the like from adhering to a pan, a frying pan, and the like while avoiding the occurrence of foreign matters due to peeling of the Teflon coating layer, etc. As a result, washing becomes easier and the pans and pans can be kept clean.

  In this Embodiment mentioned above, a hopper, a screw conveyor, a chute is illustrated as a processing instrument which concerns on this invention in Example 1, and a frying pan, a pan, etc. are illustrated as a processing instrument which concerns on this invention in Example 2. Although described, the processing apparatus according to the present invention is not limited to these, and in addition to measuring cups, shutters, transport conveyors, transport containers, transport buckets, etc., processing, transport, sliding, cooking, weighing, etc. When performing various kinds of processing, the present invention can be applied to all processing tools in which it is not preferable that the object to be processed adheres to the processing tool.

  The present invention is not limited to the embodiments of the invention described above, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Hopper 10 Storage part 11 Inner peripheral surface (area | region which contacts a to-be-processed object)
20 Chute 21 Surface (region in contact with workpiece)
100 micro dimples (concave recesses in a spherical shape)

Claims (6)

It is a metal processing instrument that comes into contact with an object to be processed which is a powdery, granular or pasty substance ,
At least in the area that comes into contact with the workpiece ,
A processing instrument characterized in that a plurality of concave portions recessed into a spherical shape and having an inlet diameter of φ10 to φ30 μm and a depth of 0.5 to 3 μm are formed. The processing instrument according to claim 1, wherein the processing instrument is a hopper that accommodates an object to be processed. The processing instrument according to claim 1, wherein the processing instrument is a chute that slides down an object to be processed. The processing instrument according to claim 1, wherein the processing instrument is a frying pan or a pan. An appliance according to the object to be processed, any one of claims 1 to 4, characterized in that a food or drug. A surface treatment method for a metal processing tool that comes into contact with an object to be processed which is a powdery, granular or pasty substance,
  At least in the area that comes into contact with the workpiece,
  A surface treatment method for a processing instrument, wherein a plurality of minute recesses having a spherical shape and having an entrance diameter of φ10 to φ30 μm and a depth of 0.5 to 3 μm are formed.