JP2023023094A - Refrigeration deburring method, method of manufacturing molded article and refrigeration deburring device - Google Patents

Abstract

To provide a refrigeration deburring method, a method of manufacturing a molded article using the same and a refrigeration deburring device that can effectively cool a target product at a stable temperature to embrittle it and perform deburring processing at low cost and in a short time without damaging the target product.SOLUTION: A method for deburring a target object by using a refrigeration deburring device having a processing chamber cooled by a refrigerant, a bucket arranged in an inner space of the processing chamber and housing the target product inside, and a shot machine for projecting a shot material toward the target product. The method includes: a pre-cooling step of measuring the inner temperature of the processing chamber and pre-cooling the inside of the processing chamber while adjusting an injection quantity of refrigerant based on the measured inner temperature and a preset pre-cooling temperature; and a deburring step of loading the target product into the pre-cooled processing chamber and performing deburring of it.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a frozen deburring method, a molded product manufacturing method, and a frozen deburring device.

2. Description of the Related Art Conventionally, as a device for removing burrs from resin products, metal products, etc. (hereinafter sometimes referred to as objects to be processed), for example, the objects to be processed are put into a bucket placed in a frozen processing chamber, and the bucket is placed in the bucket. There has been proposed a frozen deburring device that removes burrs by projecting shot material toward an object to be processed while rotating a bucket (see Patent Documents 1 and 2, for example).

The frozen deburring apparatus as described above cools the inside of the processing chamber with a refrigeration equipment, and projects a shot material toward the object to be processed while cooling and embrittlement of the object to be processed contained in the rotating bucket. to remove burrs remaining on the workpiece during the machining process.

In addition, the frozen deburring device has a door that can be opened and closed on the front side of the processing chamber. The processing chamber is hermetically sealed by closing the door while deburring the object to be processed, so that the cooling efficiency of the object to be processed can be improved.

JP 2013-86215 A JP-A-7-100767

When deburring an object to be processed using a frozen deburring device as described in Patent Documents 1 and 2, the temperature in the processing chamber generally affects the degree of embrittlement of the object to be processed. , it is preferable that the variation in the internal temperature of the processing chamber is as small as possible.

However, in the method using the conventional frozen deburring device, the deburring process is started when the internal temperature of the processing chamber is the initial room temperature. was there. As a result, in the method using the conventional frozen deburring device, the shot material collides with the workpiece that is not sufficiently embrittled, and there is a problem that the burrs are difficult to remove. In this case, for example, it is conceivable to make the operation time of the frozen deburring device longer so that the deburring process can be performed for a long period of time so that the burrs can be reliably removed. There was a risk of damage to the processed material.

The present invention has been made in view of the above problems, and it is possible to cool the object to be processed to a stable temperature to promote embrittlement, without causing damage to the object, and in a short time and at a low cost. It is an object of the present invention to provide a frozen deburring method capable of deburring, a method for manufacturing a molded product using the method, and a frozen deburring device.

The inventors of the present invention have made extensive studies to solve the above problems. As a result, a precooling step of precooling the inside of the processing chamber based on the internal temperature of the processing chamber and a preset precooling temperature, and a deburring step of putting the workpiece into the precooled processing chamber and deburring it. By adopting this method, it is possible to cool the workpiece to a stable temperature to promote embrittlement, and deburring can be performed in a short time and at a low cost without damaging the workpiece. The present invention was completed by finding that

That is, the invention according to claim 1 comprises a processing chamber cooled by a refrigerant, a bucket disposed in the inner space of the processing chamber for accommodating an object to be processed, and a shot material directed toward the object to be processed. A method of deburring the object to be processed by using a frozen deburring device equipped with a shot machine that projects, the internal temperature of the processing chamber is measured, and the measured internal temperature and the preset precooling a precooling step of precooling the inside of the processing chamber while increasing or decreasing the injection amount of the coolant based on the temperature; To provide a frozen deburring method characterized by having

The invention according to claim 2 is the frozen deburring method according to claim 1, wherein the precooling step cools the frozen deburring device in an idle state.

The invention according to claim 3 is the frozen deburring method according to claim 1 or 2, wherein the precooling step has a plurality of precooling steps.

According to a fourth aspect of the present invention, there is provided a method for producing a molded product, characterized in that burrs are removed from the molded product by the frozen deburring method according to any one of the first to third aspects.

Further, the invention according to claim 5 is characterized by a processing chamber cooled by a refrigerant, a bucket disposed in the inner space of the processing chamber for accommodating an object to be processed, and a shot material directed toward the object to be processed. a blasting shot machine, wherein the bucket includes a bucket drive unit for rotating the bucket while the object to be processed is accommodated therein; the shot machine has an impeller that is rotated by a shot machine driving part to suck up the shot material and project the shot material toward the object to be processed; a temperature sensor for measuring the internal temperature of the processing chamber; and a valve for adjusting the injection amount of the refrigerant into the internal space of the processing chamber. , the internal temperature measured by the temperature sensor, the rotation speed of the bucket measured by the bucket rotation sensor, and the rotation speed of the impeller measured by the impeller rotation sensor. a controller for controlling the number of revolutions of the bucket, the number of revolutions of the bucket, and the degree of opening of the valve, wherein the temperature sensor is arranged below the bucket in the processing chamber. It is a frozen deburring device.

According to the frozen deburring method according to the present invention, by providing the precooling step, the deburring process is started after the temperature of the entire frozen deburring apparatus is stabilized.
According to the present invention, by adopting the above method, the temperature of the object to be treated is stabilized at a low temperature, and embrittlement of the object to be treated is promoted, so that burrs can be removed efficiently. As a result, the deburring time is shortened, and the coolant consumption can be suppressed. In addition, by shortening the time for the shot material to collide with the object to be processed, it is possible to suppress damage caused by excessive polishing of the object to be processed.
Therefore, the object to be treated can be cooled to a stable temperature to promote embrittlement, and deburring can be performed in a short time and at low cost without damaging the object.

Further, according to the method for manufacturing a molded product according to the present invention, a method for manufacturing a molded product by performing deburring processing on the molded product using the above-described freezing method for removing burrs according to the present invention is adopted.
According to the present invention, similarly to the above, by starting deburring in a state where the temperature of the entire frozen deburring device is low and stable, the temperature of the molded product, which is the object to be processed, is stabilized at a low temperature, promoting embrittlement. burrs can be removed efficiently. As a result, the deburring time can be shortened, and the time for the shot material to collide with the molded product can be shortened, so that the molded product can be prevented from being excessively polished and damaged.

Further, according to the frozen deburring apparatus of the present invention, the impeller rotation speed, the bucket rotation speed, and the valve rotation speed are determined based on the internal temperature of the processing chamber, the bucket rotation speed, and the impeller rotation speed, respectively. A configuration having a control unit that controls the opening of the is adopted.
According to the present invention, by adopting the above configuration, when the deburring process is started after the temperature of the entire frozen deburring device is stabilized, the temperature of the object to be treated is further stabilized at a low temperature. embrittlement is further accelerated, burrs can be removed efficiently. As a result, as in the above case, the deburring time is shortened, so that the coolant consumption can be suppressed, and the time for the shot material to collide with the workpiece is shortened, so that the workpiece is not excessively polished. can effectively suppress the occurrence of damage.
Furthermore, since the temperature sensor is located below the bucket in the processing chamber, it is difficult for the shot material and refrigerant to come into direct contact with the temperature sensor, so measurement errors in the internal temperature of the processing chamber can be minimized. . As a result, the internal temperature of the processing chamber can be accurately measured, so that the accuracy of control processing in the entire freezer deburring apparatus can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically illustrating a method for removing frozen burrs, a method for manufacturing a molded product, and a device for removing frozen burrs, which are one embodiment of the present invention, and is a cutaway view showing an internal configuration of the device for removing burrs frozen. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically explaining a frozen deburring method, a molded product manufacturing method, and a frozen deburring device according to an embodiment of the present invention, and is a block diagram schematically showing an electrical connection configuration in the frozen deburring device; is. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically illustrating a method for removing frozen burrs, a method for manufacturing a molded product, and a device for removing frozen burrs, which are an embodiment of the present invention, and a flow chart schematically showing each step provided in the method for removing frozen burrs; . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically explaining a frozen deburring method, a molded article manufacturing method, and a frozen deburring device according to an embodiment of the present invention, and is a flow chart showing in detail a precooling step provided in the frozen deburring method; . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically illustrating a frozen deburring method, a molded product manufacturing method, and a frozen deburring apparatus according to an embodiment of the present invention, and schematically showing the relationship between the cooling time in the precooling step and the internal temperature of the processing chamber; It is a graph indicated by

DESCRIPTION OF THE PREFERRED EMBODIMENTS A frozen deburring method, a molded product manufacturing method, and a frozen deburring apparatus according to one embodiment of the present invention will be described below with reference to FIGS. 1 to 5 as appropriate.
In addition, in the drawings used in the following description, for the sake of convenience, characteristic portions may be enlarged or simplified in some cases in order to make the characteristics easier to understand. Also, the materials and the like exemplified in the following description are merely examples, and the present invention is not limited to them, and can be implemented with appropriate modifications within the scope of the invention.

The object to be processed (molded product) M to be deburred by the frozen deburring method, the molded product manufacturing method, and the frozen deburring device of the present embodiment is not particularly limited. Examples include resin products such as rubber molded products, and metal products such as die-cast molded products.
That is, for example, a molded product obtained by solidifying a heated resin, rubber, or metal into a predetermined shape using a mold generally has burrs at positions corresponding to the joints of the molds. , a method for manufacturing a molded article, and a frozen deburring apparatus are capable of efficiently removing such burrs.

<Frozen deburring device>
Hereinafter, the configuration of the frozen deburring device used in the frozen deburring method of the present embodiment will be described in detail.
FIG. 1 is a perspective view showing the overall appearance of a frozen deburring device 1 of this embodiment. FIG. 2 is a block diagram schematically showing an electrical connection configuration within the frozen deburring device 1. As shown in FIG.

A frozen deburring device 1 of this embodiment is arranged in a processing chamber 2 cooled by a refrigerant (not shown) and an internal space D of the processing chamber 2, and has an inlet 3a into which a workpiece M is introduced. The bucket 3 which is provided with an opening and accommodates the object M to be processed therein, and the shot machine 4 for projecting the shot material S toward the object M to be processed are roughly configured.

In addition, the frozen deburring device 1 of the present embodiment includes a gear box (bucket drive unit) 32 for rotating the bucket 3 with the workpiece M accommodated therein, and measures the rotation speed R1 of the bucket 3. and a bucket rotation sensor 35 .
The shot machine 4 has an impeller 42 that is rotated by an impeller rotation motor (shot machine drive unit) 43 and projects the shot material S toward the workpiece M while sucking up the shot material S. and an impeller rotation sensor 44 that measures R2.

Furthermore, in this embodiment, the temperature sensor 29 measures the internal temperature of the processing chamber 2, the valve 28b that adjusts the injection amount of the coolant (not shown) injected into the internal space D of the processing chamber 2, and the temperature sensor 29 measures The rotation speed of the impeller 42 is determined based on each measurement signal of the internal temperature T, the rotation speed R1 of the bucket 3 measured by the bucket rotation sensor 35, and the rotation speed R2 of the impeller 42 measured by the impeller rotation sensor 44. R2, the rotation speed R1 of the bucket 3, and a control unit 13 that controls the opening of the valve 28b.

In the frozen deburring device 1 of this embodiment, the temperature sensor 29 is arranged below the bucket 3 in the processing chamber 2 .

In addition to the components described above, the frozen deburring device 1 of the present embodiment further includes the exhaust section 11 and the valve 28b, and also has a coolant supply pipe 28a and a nozzle 28c for injecting coolant. A coolant supply unit 28 and a door 5 for opening and closing the opening 21 of the processing chamber 2 are provided.
Each component described above is assembled in a housing 10 that serves as a framework for the entire freezer deburring device 1 , or is provided so as to be housed in the housing 10 .

The processing chamber 2 performs deburring processing of the processing object M in the internal space D while freezing the processing object M accommodated in the bucket 3 provided therein.
In the processing chamber 2, for example, a heat insulating material such as styrene foam or a foaming material is interposed between an inner wall plate and an outer wall plate made of a stainless steel material, and a composite plate 2A having a heat insulating structure is formed, as shown in FIG. A configuration in which an internal space D is secured can be adopted.

The processing chamber 2 is provided with an opening 21 that opens to the front side of the freezer deburring device 1 , and the bucket 3 is exposed to the outside through the opening 21 , so that the object to be stored in the bucket 3 before deburring is processed. It is configured such that the workpiece M can be carried in and the workpiece M that has been deburred can be carried out. That is, in the illustrated example, the opening 21 is covered by the door 5 so that it can be opened and closed, and the door 5 can be opened and closed when the workpieces M are carried in or out of the bucket 3. there is

A plate (not shown) having a surrounding shape in plan view is disposed outside the opening 21 of the processing chamber 2 in plan view, and a seal fixing plate (not shown) and bolts (not shown) are attached to the surface of this plate. A visual sealant is fixed.

A hopper 25 having a discharge hole 24 is provided on the bottom side of the processing chamber 2, and waste such as burrs (not shown) removed from the object M to be processed and used shot materials are discharged from the discharge hole 24. The structure is such that both S can be sent toward the sorter 7, which will be described later.

The processing chamber 2 is connected to the coolant supply unit 28 described above. By supplying a coolant (not shown) from the coolant supply unit 28 into the processing chamber 2, the processing chamber 2 (internal space D ) is cooled. The coolant supply unit 28 includes, for example, a coolant supply pipe 28a in which a valve 28b is interposed in addition to a tank for storing coolant, and a nozzle 28c for injecting coolant toward the internal space D of the processing chamber 2. can be adopted.

In the example shown in FIG. 1, the coolant supply unit 28 is controlled by a command from the control unit 13 according to the internal temperature T of the processing chamber 2 measured by the temperature sensor 29 arranged below the bucket 3. is automatically opened and closed, the temperature of the processing chamber 2 can be automatically adjusted. Such adjustment of the temperature of the processing chamber 2 is performed by the control unit 13 by, for example, operating an operation panel (not shown) provided in the control unit 13 to set the cooling temperature.

As described above, the valve 28b is provided through the coolant supply pipe 28a between the tank that constitutes the coolant supply section 28 and the nozzle 28c, and adjusts the injection amount of the coolant that is jetted from the nozzle 28c. . Since the valve 28b operates in response to a control signal from the control unit 13, it is preferable that the valve 28b is composed of, for example, an electromagnetic valve.

The injection amount of the coolant described above can be increased or decreased by controlling the on/off of the valve 28b based on, for example, the measured internal temperature T of the processing chamber 2 and the preset pre-cooling temperature PT. For example, when the internal temperature T of the processing chamber 2 is higher than the precooling temperature PT, the internal temperature T of the processing chamber 2 can be lowered by fully opening the valve 28b. On the other hand, when the internal temperature T of the processing chamber 2 is lower than the precooling temperature PT, the temperature of the processing chamber 2 can be raised by fully closing the valve 28b.

As the coolant used for cooling the processing chamber 2 and, in turn, cooling the object M to be processed, an inert substance that can cool the object M to a temperature below the embrittlement temperature and that is inert can be used, for example, liquefied nitrogen, A refrigerant composed of a liquefied inert gas such as a liquefied carbon dioxide gas can be used.

Furthermore, in the present embodiment, as in the example shown in FIG. 1, a configuration can be adopted in which an exhaust portion 11 is provided, which is a pipe for discharging the vaporized gas containing the refrigerant generated in the processing chamber 2 into the atmosphere. The exhaust unit 11 includes, in addition to the exhaust pipe, a damper (not shown) that restricts the inflow of air into the processing chamber 2 and a dust collector (not shown) that collects dust generated in the processing chamber 2. can be adopted.

The temperature sensor 29 measures the internal temperature T of the processing chamber 2 as described above, and this measured value is transmitted to the control unit 13 via an A/D (analog/digital) converter (not shown). be done. In the illustrated example, the temperature sensor 29 is arranged in the vicinity of the hopper 25 that constitutes the processing chamber 2 , just below the bucket 3 . That is, the temperature sensor 29 is arranged below the bucket 3 at a position where the shot material S projected from the shot machine 4 (details of which will be described later) and the refrigerant injected from the nozzle 28c do not flow directly. be done. This makes it difficult for the shot material S and the coolant to come into direct contact with the temperature sensor 29, so that measurement errors in the internal temperature T of the processing chamber 2 can be minimized. As a result, the internal temperature T of the processing chamber 2 can be accurately measured, so that the accuracy of control processing in the entire frozen deburring apparatus 1 can be enhanced, as will be described in detail later.
Specifically, the shot material S and the coolant generally contact the outer surface of the bucket 3 and the wall surface of the processing chamber 2 once, and then indirectly contact the temperature sensor 29. Therefore, the value measured by the temperature sensor 29 It is possible to minimize the impact on

The temperature measuring means constituting the temperature sensor 29 is not particularly limited, and any means can be adopted as long as it can measure the temperature during the deburring process. A thermocouple or the like can be mentioned.

The bucket 3 is installed in the processing chamber 2, and consists of a substantially cylindrical basket-shaped member with a bulging side wall on the bottom side, which rotates around an axis while containing the object M to be processed. The material of the bucket 3 is, for example, a perforated plate or the like having through holes through which the shot material S projected from the shot machine 4, which will be described later in detail, can pass.

As described above, the frozen deburring device 1 of this embodiment includes the gear box 32 that rotates the bucket 3 with the workpiece M accommodated therein, and the bucket rotation sensor 35 that measures the rotation speed of the bucket 3. have.

Also, the bucket 3 used in this embodiment is horizontally rotatably attached to the gear box 32 to which the other end side of the pair of rotating shafts 32c, 32c is attached, so that the inside of the processing chamber 2 is It is installed so as to float in the space D. One end sides of the pair of rotating shafts 32c, 32c are attached to both side walls of the housing 10 so that the pair of rotating shafts 32c, 32c are coaxial.

Inside the gear box 32, the rotary motion of a bucket rotating motor (bucket driving section) 32a provided integrally with the gear box 32 is transmitted to a cylinder via a rotation transmission shaft connected to the bucket rotating motor 32a. A rotation transmission mechanism is provided to rotate the bucket 3 in the forward and reverse directions around the axis. This rotation transmission mechanism includes, for example, a small bevel gear attached to a rotation transmission shaft (not shown), a large bevel gear rotatably provided so as to mesh with the small bevel gear, and one end fixed to the large bevel gear. and a bucket shaft 32b attached to the bottom surface of the bucket 3 at the other end.
The number of revolutions of the bucket rotation motor 32 a is controlled by the control unit 13 .

By rotating one of the rotating shafts 32c, the inlet 3a of the bucket 3 can be moved to a desired position in the processing chamber 2, or the inlet 3a of the bucket 3 can be moved. is moved to the outside of the apparatus from the opening 21, and the workpiece M can be placed in a position where it can be carried into or out of the bucket 3. Bucket rotating means (not shown) is provided.

Although not shown in detail, the bucket rotating means is connected to, for example, a bucket rotating motor capable of forward and reverse rotation and a drive shaft of the bucket rotating motor, and rotates in the axial direction of the drive shaft. a drive pulley attached to the output shaft; a pulley attached to one of the rotary shafts 32c at a position corresponding to the drive pulley; Consists of a suspended belt. Further, the bucket rotating means is arranged such that the position of the bucket 3, for example, is the position at which the shot material S is projected, the input position of the workpiece M to be deburred, and the discharge position of the deburred workpiece M. A configuration including a sensor using the above pulley for detecting each position and stopping the above bucket drive motor can be employed.

As described above, the bucket rotation sensor 35 measures the number of revolutions R1 when the bucket 3 rotates about its axis. It is transmitted to the control unit 13 .
The rotation speed measuring means used for the bucket rotation sensor 35 is not particularly limited, and a general rotation speed detection element or the like can be used without any limitation.

The door 5 opens and closes the opening 21 of the processing chamber 2, and is configured to be openable and closable by, for example, a hinge member (not shown). That is, the door 5 is opened and closed by an operator or an automatic opening/closing mechanism (not shown) when the material to be processed M is carried into or out of the bucket 3 . The door 5 covers the opening 21 of the processing chamber 2 when the object M to be processed is deburred in the processing chamber 2, thereby improving the cooling efficiency of the internal space D and the object M to be processed. There is an effect that effective deburring processing becomes possible.

The door 5 may have, for example, a structure that opens and closes the opening 21 of the processing chamber 2 by a so-called pull-down method, or another structure may be adopted.

The sorter 7 separates the shot material S containing waste such as burrs falling downward from a hopper 25 (discharge hole 24) provided in the processing chamber 2 into burrs larger in size than the shot material S, The shot material S and burrs smaller in size than the shot material S are sorted out.
Specifically, the sorter 7 shown in FIG. 1 includes a vibrating screen for sorting large burrs provided with a large burr storage tank, and a shot material sorting tank having a shot material storage tank 73 and a small burr storage tank, although detailed illustration is omitted. and a sorting unit equipped with a vibrating screen.
With the above configuration, the sorter 7 sorts the shot material S containing waste such as burrs, which is dropped and discharged from the processing chamber 2 through the hopper 25, without being exposed to the outside air.

The shot machine 4 projects the shot material S toward the workpiece M as described above.
Specifically, the shot machine 4 moves the shot material S stored in the shot material storage tank 73 provided in the sorter 7 described above with the suction hose 41 by the rotation of the impeller 42 driven by the impeller rotation motor 43 . It is sucked and projected into the bucket 3. The workpiece M having burrs is removed from the burrs by the impact caused by the shot material S being projected.

More specifically, the impeller rotating motor 43 is provided so as to be integrated with the impeller 42, and is connected to the impeller 42 via, for example, a bearing or a rotating shaft. That is, the impeller 42 is rotated by the impeller rotation motor 43 to generate a negative pressure, thereby sucking up the shot material S from the shot material storage tank 73 described above. The sucked shot materials S are projected toward the bucket 3 after colliding with the impeller 42 .
A motor used as the impeller rotating motor 43 is controlled to rotate by the control unit 13 .

Although the case body of the shot machine 4 is not particularly limited, for example, one having a heat insulating structure can be used.
As the shot material S projected by the shot machine 4, one made of a general plastic material is used.

Further, in this embodiment, when the door 5 covers the opening 21 and is closed, it is more preferable that the inlet 3a of the bucket 3 and the shot outlet 4a of the shot machine 4 are arranged to face each other. .
Since the shot material S can be efficiently projected onto the workpiece M by arranging the inlet 3a of the bucket 3 and the projection opening 4a of the shot machine 4 to face each other in this manner, efficient deburring can be achieved. becomes possible.

The impeller rotation sensor 44 measures the rotation speed R2 of the impeller 42 rotated by the impeller rotation motor 43 as described above. , for example, is transmitted to the control unit 13 via an A/D converter or the like.
As in the case of the bucket rotation sensor 35, the rotation speed measuring means used for the impeller rotation sensor 44 is not particularly limited, and a general rotation speed detection element or the like can be used without any limitation.

The material used for each structural member of the frozen deburring device 1 of the present embodiment is not particularly limited and can be appropriately selected. For example, considering that the frozen deburring device 1 of the present embodiment cools the processing chamber 2, the workpiece M, etc., and that the surrounding members will also be cooled, the materials of each member include: A stainless steel material is preferably used from the viewpoint of strength, rust resistance, low temperature resistance, and the like.

As described above, the control unit 13 controls the internal temperature T measured by the temperature sensor 29, the rotation speed R1 of the bucket 3 measured by the bucket rotation sensor 35, and the rotation of the impeller 42 measured by the impeller rotation sensor 44. Based on each of the numbers R2, the rotational speed R2 of the impeller 42, the rotational speed R1 of the bucket 3, and the opening of the valve 28b are controlled.
That is, as shown in FIG. 2, the control unit 13 is electrically connected to the temperature sensor 29, the bucket rotation sensor 35, the impeller rotation sensor 44, the input device 13a and the display device 13b.
Further, the control unit 13 includes a valve 28b for adjusting the flow rate of the refrigerant, a bucket rotation motor 32a, and an impeller rotation motor 43, and a valve drive circuit 13A, a bucket rotation motor drive circuit 13B, or an impeller rotation motor drive circuit, respectively. 13C are electrically connected.

The input device 13a has an interface including, for example, touch keys. The input device 13a, for example, selects the deburring mode, sets the number of revolutions R1 of the bucket 3, the number of revolutions R2 of the impeller 42, the precooling temperature PT, and the internal temperature T of the processing chamber 2 during the deburring process.

The display device 13b is composed of, for example, a display or an LED display. The display device 13b displays, for example, the internal temperature T of the processing chamber 2, the number of revolutions R1 of the bucket 3, the number of revolutions R2 of the impeller 42, and the like. Furthermore, the display device 13b also displays the information input by the input device 13a described above.

In addition, in the frozen deburring device 1 of the present embodiment, in order to improve the airtightness of the processing chamber 2 (internal space D) whose opening 21 is covered by the door 5, a sealing material (not shown) can be provided. . The sealing material is, for example, installed along a frame (not shown) arranged so as to surround the opening 21 of the processing chamber 2, and consists of a long member arranged so as to have a surrounding shape in a plan view as a whole. Become. The sealant can be fixed to the frame by, for example, being adhered to the frame (not shown) or sandwiched between the frame and a seal fixing plate.
When the opening 21 of the processing chamber 2 is covered with the door 5, the sealing material is compressed between the door 5 and a frame (not shown) to seal the door 5 and the opening 21. is obtained.

The sealing material is elongated, for example, in the shape of a string when viewed from above, and is made of an elastic material having excellent cold resistance (low temperature resistance). The elastic material that constitutes such a sealing material is not particularly limited, but examples thereof include rubber materials such as nitrile rubber and silicone rubber.

In addition, the sealing material has, for example, a hollow structure along the longitudinal direction, and has a structure in which a plurality of elongated projections are provided on the surface of the sealing material so as to be continuous in the longitudinal direction. As a result, the sealing material is compressed when the door 5 is closed, and the sealing of the processing chamber 2 (internal space D) can be further improved.

Further, the sealing material may have a plan view surrounding shape that is completely connected along the opening 21 of the processing chamber 2. It can be used as material. By dividing the sealing material into a plurality of members in this manner, the effect of improving workability when fixing the sealing material to the frame disposed around the opening 21 is obtained. In addition, since the sealing material can be fixed step by step from the deformed portion along the shape of the processing chamber 2, the installation work of the sealing material is facilitated. In addition, by arranging the sealing material in a string-like shape in plan view, it is possible to form the sealing material into a shape corresponding to the opening 21 of the processing chamber 2 without customizing the sealing material. The cost of the device 1 can be reduced.

Also, although illustration is omitted, the sealing material may employ a configuration in which a heater is installed inside a hollow structure, for example. By installing a heater in the sealing material, for example, when the internal space D of the processing chamber 2 is lowered to a predetermined temperature, the sealing material is prevented from hardening due to electric heating.
Resin materials such as rubber as described above are generally used as sealing materials, but such materials tend to lose their elasticity when cooled, resulting in a decrease in sealing performance and seal durability. By adopting a configuration in which a heater is provided inside the sealing material, it is possible to prevent the temperature of the sealing material from lowering, so that a remarkable effect of improving sealing performance and sealing durability can be obtained.

In addition, the above-mentioned "plan view surrounding shape" includes a shape arranged and formed long so as to surround the center direction in plan view, for example, a rectangular shape in plan view, an annular shape, and an intermediate shape between these. It also includes a shape.

The freezer deburring device 1 of the present embodiment operates based on measurement signals of the internal temperature T of the processing chamber 2, the rotation speed R1 of the bucket 3, and the rotation speed R2 of the impeller 42. A controller 13 is provided to control the rotational speed R1 and the opening of the valve 28b. As a result, when the deburring process is started after the temperature of the entire frozen deburring device 1 is stabilized, the temperature of the object M to be treated is further stabilized at a low temperature, and the embrittlement of the object to be treated M is further promoted. Therefore, burrs can be removed efficiently. As a result, the deburring time is shortened, so that the consumption of the coolant can be suppressed, and the time for the shot material S to collide with the workpiece M is shortened, so that the workpiece M is excessively polished. can effectively suppress the occurrence of damage.
Further, since the temperature sensor 29 is arranged below the bucket 3 in the processing chamber 2, it is difficult for the shot material S and the coolant to come into direct contact with the temperature sensor 29. Measurement errors can be minimized. As a result, the internal temperature T of the processing chamber 2 can be accurately measured, so that the accuracy of control processing in the frozen deburring apparatus 1 as a whole can be enhanced.

<Method for removing frozen burrs>
Next, the procedure of the frozen deburring method of this embodiment will be described in detail.
In the present embodiment, the procedure for deburring the workpiece M using the frozen deburring device 1 of the present embodiment shown in FIGS. 1 and 2 will be described. 1 and 2 in the same manner as above, and further with reference to FIGS. 3 to 5 as appropriate.

FIG. 3 is a flow chart schematically showing each step provided in the frozen deburring method of the present embodiment. Moreover, FIG. 4 is a flow chart showing in detail the precooling process provided in the frozen deburring method of the present embodiment. FIG. 5 is a graph schematically showing the relationship between the cooling time in the precooling process and the internal temperature of the processing chamber.

The frozen deburring method of the present embodiment includes a processing chamber 2 cooled by a refrigerant, a bucket 3 disposed in an internal space D of the processing chamber 2 and accommodating an object M to be processed, and a bucket 3 facing the object M to be processed. This is a method of deburring an object to be processed M using a frozen deburring device 1 equipped with a shot machine 4 for projecting a shot material S on the surface.
3 and 4 (see also FIGS. 1 and 2). , a precooling step (precooling mode) in which the inside of the processing chamber 2 is precooled while increasing or decreasing the injection amount of the coolant based on a preset precooling temperature PT; and a deburring step (deburring mode) for deburring.

When deburring the object M to be processed by the frozen deburring method of the present embodiment, as shown in the flowchart of FIG. . The operation modes selected at this time include a deburring mode (deburring process) and a precooling mode (precooling process).

For example, when operating the frozen deburring device from room temperature, the operator selects the precooling mode by operating the input device 13a. On the other hand, when the deburring operation is continuously performed, the entire frozen deburring device 1 has already been cooled and the temperature is low and stable when the second and subsequent deburring operations are performed. select the deburring mode.
Further, as shown in FIG. 3, when the pre-cooling mode is selected, the entire frozen deburring device 1 is cooled by the pre-cooling mode, and after the temperature is stabilized at a low temperature, the deburring mode is subsequently selected. implement.

In the precooling mode, for example, the frozen deburring device 1 can be idled at a predetermined precooling temperature PT and a predetermined precooling time to cool the entire frozen deburring device 1 . Here, the idle operation described in the present invention means rotating the bucket 3 and the impeller 42 of the shot machine 4 while cooling the inside of the processing chamber 2 in a state where the bucket 3 does not contain the workpieces M. It means an operation in which the shot material S is circulated in the frozen deburring device 1 .

When the pre-cooling mode is performed in idle operation as described above, the pre-cooling temperature PT and the pre-cooling time can be appropriately determined according to the heat capacity and cold insulation performance of the device 1 for removing frozen burrs. Here, the pre-cooling time in the present invention means the time from the time when the injection of the refrigerant from the nozzle 28c is started to the time when the injection is finished.

The pre-cooling mode (pre-cooling process) in this embodiment may be a procedure/condition for performing only one pre-cooling step, or may be a procedure/condition for performing a plurality of pre-cooling steps.
On the other hand, the precooling mode is more preferably performed in a plurality of steps from the viewpoint of stabilizing the internal temperature T of the processing chamber 2 at a low temperature.

Hereinafter, the precooling mode will be described in more detail with reference to the flow chart of FIG. 4 and the graph of FIG. 5 (see also FIGS. 1 and 2).
First, the operator who has selected the pre-cooling mode by operating the input device 13a continues to perform the number of cooling steps (cooling mode), the temperature reached in each cooling step (T1, T2, T3 shown in the graph of FIG. 5, and the flash temperature). See the temperature at the time of taking) and the pre-cooling time of each cooling step are set from the input device 13a. That is, as shown in FIG. 4, the input device 13a is operated to set the number of repetitions of the precooling step n, the nth preset temperature, and the nth precooling time in the precooling mode (see S1 in FIG. 4). ).

After that, when the operation in the precooling mode is started, idle operation is started by operating the bucket rotation motor 32a and the impeller rotation motor 43 in response to a signal from the control unit 13 (see S2 in FIG. 4). ).
The number of revolutions R1 of the bucket 3 and the number of revolutions R2 of the impeller 42 in the precooling mode are not particularly limited, but from the viewpoint of stabilizing the temperature of the entire apparatus, a deburring mode (deburring process) described later is used. It is preferable that the conditions are the same as those of the rotation speeds R1 and R2 planned in .

After the number of rotations R1 of the bucket 3 and the number of rotations R2 of the impeller 42 have reached the predetermined number of rotations and the idling state has stabilized, the valve 28b is opened by a signal from the control unit 13, and A refrigerant (eg, liquefied nitrogen) is jetted from the nozzle 28c (see S3 in FIG. 4).
At this time, the internal temperature T of the processing chamber 2 is measured by the temperature sensor 29 and this measured value is sent to the control section 13 . That is, it is determined whether the internal temperature T of the processing chamber 2 is the n-th set temperature (reaching temperature: temperature T1, T2, T3 shown in FIG. 5, or the temperature at the time of deburring), and the set temperature If not, the controller 13 controls to further increase the opening of the valve 28b. On the other hand, when the internal temperature T of the processing chamber 2 reaches the target temperature, the controller 13 controls the opening of the valve 28b to be lowered (see S4 in FIG. 4).

Here, when the precooling mode is performed in a plurality of precooling steps, the control unit 13 outputs a signal to increase the opening of the valve 28b after each precooling time (the n-th precooling time shown in FIG. 4) has elapsed. By sending out, control is performed so that the processing chamber 2 is cooled to the temperature reached in the next precooling step (see also S5 shown in FIG. 4 and the 1st to 4th precooling times shown in FIG. 5). .

Then, after the precooling time of the final step (see S6 in FIG. 4 and the fourth precooling time shown in FIG. 5) has elapsed, the control unit 13 controls the bucket rotation motor 32a and the impeller rotation motor A stop signal is sent to 43 to stop idle operation, thereby ending the precooling mode (see S7 in FIG. 4 and end of precooling shown in FIG. 5).

Although the temperature during deburring shown in the graph of FIG. 5 is not particularly limited, it can be set to a temperature at which the workpiece M becomes embrittled or lower. In particular, when the object M to be treated is made of resin or rubber, it is preferable to cool the object to a glass transition temperature or lower, but the cooling temperature may be equal to or higher than the embrittlement temperature.

Next, in the deburring mode (deburring process), first, the opening 21 of the processing chamber 2 is opened by opening the door 5, and the inlet 3a of the bucket 3 faces the opening 21 side. , the bucket 3 accommodates an object M to be deburred.
At this time, the time during which the door 5 is opened is preferably as short as possible from the viewpoint of keeping the entire frozen deburring device 1 at a low temperature.

Next, a signal from the control unit 13 causes the impeller 42 provided in the shot machine 4 to rotate at a predetermined rotational speed. As a result, the shot material S is sucked up from the shot material storage tank 73 through the suction hose 41 and projected toward the bucket 3 from the projection opening 4a. At this time, the shot material S passes through the through holes formed in the bucket 3 and collides with the object M to be processed, and the burrs of the object M are removed. Further, as the bucket 3 rotates at a predetermined speed, the material to be processed M accommodated therein is agitated.

The shot material S projected by the shot machine 4 and the burrs removed from the workpiece M fall from the hopper 25 toward the sorter 7, and a vibration for sorting large burrs (not shown) provided in the sorter 7 is provided in the sorter 7. In the sieve, large burrs are collected in a large burr storage tank. On the other hand, the shot materials S and small burrs that have passed through the large burr sorting vibrating screen are sorted into shot materials S and small burrs by the shot material sorting vibrating screen (not shown). Small burrs are stored in a small burr storage tank (not shown).
As each sorting means having a sieve as described above, known ones can be used without any limitation.

Through the above procedure, the shot material S is circulated and used between the shot material storage tank 73, the suction hose 41, the shot machine 4, the processing chamber 2, the hopper 25 and the sorter 7, and the shot machine 4 and the sorter 7 are Since they operate in conjunction with each other, the shot material S does not stay in the path, and the deburring process can be performed with high efficiency.

After the burrs are removed from the workpiece M in the bucket 3 by the shot material S being projected, the driving of the bucket 3, the shot machine 4 (impeller 42), and the sorter 7 (including the shot material storage tank 73) is stopped. .
Next, by opening the door 5, the inlet 3a of the bucket 3 faces the opening 21 side again.
Next, after taking out the workpiece M from which the burrs have been removed from the bucket 3, the workpiece M to be deburred next is accommodated in the bucket 3, the door 5 is closed again, and the opening 21 is opened. cover the
Next, as in the above, after the temperature of the workpiece M becomes equal to or lower than the embrittlement temperature, the impeller 42 provided in the shot machine 4 is rotated at a predetermined rotational speed to project the shot material S toward the bucket 3. , deburring processing of the workpieces M accommodated in the bucket 3 is performed.
As a result, the same deburring operation as described above can be repeated.

Below, the effect obtained by the frozen deburring method of the present embodiment will be described in more detail.
According to the frozen deburring method of the present embodiment, the above precooling step is performed, and the deburring process is started after the temperature of the entire frozen deburring device 1 is stabilized at a low temperature. Since the deburring process is started while the entire apparatus 1 is pre-cooled, embrittlement of the object to be processed is accelerated, and burrs can be removed efficiently. As a result, the deburring time can be shortened, and the coolant consumption can be suppressed. Moreover, since the time for which the shot material S collides with the workpiece M can be shortened, it is possible to suppress the workpiece M from being excessively polished and damaged. Furthermore, since the deburring process can always be performed at a stable temperature, the deburred quality of the object M to be processed is stable even if there are different lots or seasonal fluctuations in the atmospheric temperature.

In addition, according to the frozen deburring method of the present embodiment, the precooling mode (precooling step) is a method of cooling the frozen deburring device 1 in an idle state, so that the cooled shot material S in the device circulates, the temperature of the entire device becomes low and uniform quickly. In addition, the rotation of the bucket 3 facilitates the transmission of cold heat to the inside of the driving section such as the gear box 32, so that the temperature of the entire apparatus is quickly uniformized at a low temperature, as described above. Further, since the deburring process is performed in a state in which the temperature of the entire apparatus is uniform, temperature change in the deburring process can be suppressed. As a result, embrittlement of the object M to be processed is accelerated, so that the deburring time can be shortened and the consumption of coolant can be suppressed. Moreover, since the time for which the shot material S collides with the workpiece M can be shortened, it is possible to further suppress the workpiece M from being excessively polished and damaged. Furthermore, as described above, since the deburring process can always be performed at a stable temperature, the quality of the workpiece M after deburring is stable even if there are different lots or seasonal fluctuations in the atmospheric temperature.

Furthermore, according to the frozen deburring method of the present embodiment, the precooling mode has a plurality of precooling steps, so that the processing chamber 2 is cooled step by step. It is possible to suppress the cycling phenomenon that decreases and rises with respect to the taking temperature. In particular, since it is possible to prevent the internal temperature T of the processing chamber 2 from overshooting the deburring temperature, the temperature of the processing chamber is quickly stabilized at a low temperature, and the amount of refrigerant to be processed can be reduced.

<Method for manufacturing molded product>
Next, the method for manufacturing the molded product of this embodiment will be described in detail.
The method for manufacturing a molded product according to this embodiment is a method for manufacturing a molded product by removing burrs from the molded product by the method for removing burrs in the freezer according to the above-described embodiment. Therefore, in the following description, similar to the above description, reference will be made to FIGS. 1 to 5, and detailed description of the procedures, conditions, etc. will be omitted.

The molded product to which the manufacturing method of the present embodiment is applied is similar to the object to be processed M described above, for example, a resin product such as a plastic molded product or a rubber molded product, or a die-cast molded product. of metal products.

According to the method for manufacturing a molded product of the present embodiment, similarly to the above, deburring is started in a state where the temperature of the entire frozen deburring device 1 is low and stable, so that the temperature of the molded product (processed object M) increases. Since it is stable at low temperatures and promotes embrittlement, burrs can be removed efficiently. As a result, the deburring time can be shortened, and the time for the shot material S to collide with the molded product can be shortened, so that the molded product can be prevented from being excessively polished and damaged.

<Other forms>
Although an example of the frozen deburring method, the molded product manufacturing method, and the frozen deburring apparatus according to the present invention has been described above, the present invention is not limited to the above embodiments. Each configuration, combination thereof, and the like in the above-described embodiment are examples, and addition, omission, replacement, and other modifications of the configuration are possible without departing from the scope of the present invention.

For example, in the present embodiment, a so-called pull-down system is described in which the door 5 opens and closes with a hinge (not shown) provided on the underside of the door 5 as a fulcrum. is not limited. As the opening and closing structure of the door, for example, a single-opening structure in which hinges are provided on either the left or right side of the door may be adopted, or the mounting structure of the bucket 3 may be optimized. , a double-opening system, that is, a so-called double-door structure may be adopted.

<Effect>
As described above, according to the frozen deburring method of the present embodiment, by including the precooling step, the deburring process is started after the temperature of the entire frozen deburring device 1 is stabilized. is employed.
By adopting the method described above, the frozen deburring method of the present embodiment stabilizes the temperature of the object M to be processed at a low temperature and promotes the embrittlement of the object M to be processed, thereby efficiently removing burrs. can. As a result, the deburring time is shortened, and the coolant consumption can be suppressed. In addition, by shortening the time for the shot material to collide with the workpiece M, it is possible to prevent the workpiece M from being excessively polished and damaged.
Therefore, the object M to be processed can be cooled to a stable temperature to promote embrittlement, and the deburring process can be performed in a short time and at a low cost without damaging the object M to be processed.

Further, according to the method for manufacturing a molded product of the present embodiment, the method for manufacturing a molded product is performed by deburring the molded product (object to be processed M) using the above-described frozen deburring method of the present embodiment. We are hiring.
According to the method for manufacturing a molded product of the present embodiment, similarly to the above, deburring is started in a state where the temperature of the entire frozen deburring device 1 is low and stable, so that the temperature of the molded product, which is the object M to be processed, increases. Since it is stable at low temperatures and promotes embrittlement, burrs can be removed efficiently. As a result, the deburring time can be shortened, and the time for the shot material to collide with the molded product can be shortened, so that the molded product can be prevented from being excessively polished and damaged.

Further, according to the frozen deburring device 1 of the present embodiment, the impeller is measured based on the measurement signals of the internal temperature T of the processing chamber 2, the rotation speed R1 of the bucket 3, and the rotation speed R2 of the impeller 42 as described above. 42, the bucket rotation speed R1, and the control unit 13 for controlling the opening of the valve 28b.
According to the frozen deburring device 1 of the present embodiment, by adopting the above configuration, when the deburring process is started after the temperature of the entire frozen deburring device 1 is stabilized, the temperature of the object M to be processed rises to Since it is more stable at low temperatures and the embrittlement of the workpiece M is accelerated, burrs can be removed efficiently. As a result, as described above, the deburring time is shortened, thereby suppressing the consumption of the coolant. It is possible to effectively suppress the occurrence of damage due to excessive polishing.
Further, since the temperature sensor 29 is arranged below the bucket 3 in the processing chamber 2, it is difficult for the shot material S and the coolant to come into direct contact with the temperature sensor 29. Measurement errors can be minimized. As a result, the internal temperature T of the processing chamber 2 can be accurately measured, so that the accuracy of control processing in the frozen deburring apparatus 1 as a whole can be enhanced.

As described above, the frozen deburring method of the present invention can accelerate embrittlement by cooling the object to be treated to a stable temperature, and removes burrs in a short time and at low cost without damaging the object. It is a method that can perform a picking process. Therefore, the present invention is extremely useful in, for example, a method for removing burrs from objects to be processed such as resin products and metal products, a method for manufacturing molded products, and a frozen deburring device by shot blasting.

REFERENCE SIGNS LIST 1 Frozen deburring device 2 Treatment chamber 2A Composite plate 21 Opening 24 Discharge hole 25 Hopper 28 Refrigerant supply unit 28a Refrigerant supply pipe 28b Valve 28c Nozzle 29 Temperature sensor D Internal space 3 ... Bucket 3a ... Input port 32 ... Gear box 32a ... Motor for bucket rotation (bucket drive unit)
32b... Bucket shaft 32c... Rotating shaft (a pair of rotating shafts)
35... Bucket rotation sensor 4... Shot machine 4a... Projection opening 41... Suction hose 42... Impeller 43... Motor for impeller rotation (shot machine drive unit)
44... Impeller rotation sensor 5... Door 7... Sorter 73... Shot material storage tank 10... Case 11... Exhaust part 13... Control part 13A... Valve drive circuit 13B... Bucket rotation motor drive circuit 13C... Impeller rotation motor drive circuit 13a... Input device 13b... Display device M... Object to be processed S... Shot material

Claims (5)

a processing chamber cooled by a refrigerant;
a bucket that is arranged in the inner space of the processing chamber and accommodates an object to be processed therein;
A method of deburring the object to be processed using a frozen deburring device comprising a shot machine for projecting a shot material toward the object to be processed,
a precooling step of measuring the internal temperature of the processing chamber and precooling the interior of the processing chamber while increasing or decreasing the injection amount of the coolant based on the measured internal temperature and a preset precooling temperature;
and a deburring step of putting the object to be processed into the previously cooled processing chamber and deburring the object. 2. The frozen deburring method according to claim 1, wherein the precooling step cools the frozen deburring device in an idle state. 3. The frozen deburring method according to claim 1, wherein the precooling process has a plurality of precooling steps. A method for producing a molded product, wherein burrs are removed from the molded product by the frozen deburring method according to any one of claims 1 to 3. a processing chamber cooled by a refrigerant;
a bucket that is arranged in the inner space of the processing chamber and accommodates an object to be processed therein;
A frozen deburring device comprising a shot machine for projecting a shot material toward the object to be processed,
The bucket has a bucket drive unit for rotating the bucket with the object to be processed stored therein, and a bucket rotation sensor for measuring the rotation speed of the bucket,
The shot machine has an impeller that is rotated by a shot machine driving unit and projects the shot material toward the object to be processed while sucking up the shot material, and an impeller rotation sensor that measures the rotation speed of the impeller. and
moreover,
a temperature sensor that measures the internal temperature of the processing chamber;
a valve for adjusting the injection amount of the coolant into the inner space of the processing chamber;
Based on measurement signals of the internal temperature measured by the temperature sensor, the number of rotations of the bucket measured by the bucket rotation sensor, and the number of rotations of the impeller measured by the impeller rotation sensor, a control unit that controls the number of revolutions, the number of revolutions of the bucket, and the degree of opening of the valve;
with
A frozen deburring device, wherein the temperature sensor is arranged below the bucket in the processing chamber.

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