JP7407149B2 - Freezing deburring method, molded product manufacturing method, and freezing deburring equipment - Google Patents

Description

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

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 placed in a bucket placed in a frozen processing chamber, and then the objects are placed in a bucket. A freezing deburring apparatus has been proposed that deburrs by projecting shot material toward a workpiece while rotating a bucket (see, for example, Patent Documents 1 and 2).

The above-mentioned freezing deburring equipment cools the inside of the processing chamber using refrigeration equipment, and projects shot material toward the workpiece while cooling and embrittling the workpiece stored in a 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, and by opening this door, you can load the workpiece into the bucket and remove the deburred workpiece. In addition to transporting the workpiece out of the apparatus, the processing chamber is sealed by closing the door during the deburring process of the workpiece, thereby increasing the cooling efficiency of the workpiece.

Japanese Patent Application Publication No. 2013-86215 Japanese Patent Application Publication No. 7-100767

When deburring a workpiece using a frozen deburring apparatus such as those described in Patent Documents 1 and 2, the temperature within the processing chamber generally affects the degree of embrittlement of the workpiece. It is preferable that variations in the internal temperature of the processing chamber be as small as possible.

However, in the conventional method using a frozen deburring device, the deburring process is started when the temperature inside the processing chamber is initially room temperature, so there are cases where the deburring process is performed when the temperature inside the processing chamber is unstable. was there. As a result, in the conventional method using a frozen burr removal device, the shot material is caused to collide with a workpiece that has not been sufficiently embrittled, resulting in a problem in that burrs are difficult to remove. In this case, for example, it may be possible to reliably remove burrs by increasing the operation time of the freezing deburring equipment and deburring for a long time, but if deburring is performed for a long time, the There was a risk that the processed items would be damaged.

The present invention has been made in view of the above problems, and is capable of promoting embrittlement by cooling a workpiece to a stable temperature, without causing damage to the workpiece, in a short time and at low cost. It is an object of the present invention to provide a frozen deburring method capable of performing deburring processing, a method for producing a molded product using the same, and a frozen deburring device.

The present inventors have made extensive studies to solve the above problems. As a result, a pre-cooling step in which the inside of the processing chamber is pre-cooled based on the internal temperature of the processing chamber and a pre-set pre-cooling temperature, and a deburring step in which the workpiece is put into the pre-cooled processing chamber and deburred. By adopting this method, the workpiece is cooled to a stable temperature to promote embrittlement, and deburring can be performed in a short time and at low cost without causing damage to the workpiece. The present invention has been completed based on the following findings.

That is, the invention according to claim 1 includes a processing chamber cooled by a refrigerant, a bucket disposed in an internal space of the processing chamber and containing a workpiece therein, and a shot material directed toward the workpiece. A method for deburring the workpiece using a frozen deburring device equipped with a shot shot machine, the method comprising: measuring the internal temperature of the processing chamber; a pre-cooling step in which the inside of the processing chamber is pre-cooled while increasing or decreasing the injection amount of refrigerant based on the temperature; and a deburring step in which the workpiece is put into the pre-cooled processing chamber and deburred. Provided is a frozen deburring method characterized by having the following steps.

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

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

The invention according to claim 4 is a method for manufacturing a molded product, characterized in that burrs are removed from the molded product by the freezing deburring method according to any one of claims 1 to 3.

Further, the invention according to claim 5 includes a processing chamber cooled by a refrigerant, a bucket disposed in an internal space of the processing chamber and containing a workpiece therein, and a shot material directed toward the workpiece. A refrigerated deburring device comprising: a shot projecting machine; the bucket includes a bucket drive unit for rotating the bucket with the workpiece accommodated therein; The shot machine has a bucket rotation sensor for measuring, and the shot machine is rotated by a shot machine drive unit, and an impeller that projects the shot material toward the object to be processed while sucking up the shot material, and the impeller. an impeller rotation sensor that measures the rotation speed of the processing chamber, and further includes a temperature sensor that measures the internal temperature of the processing chamber, and a valve that adjusts the amount of the refrigerant injected into the internal space of the processing chamber. , the impeller based on measurement signals of 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 control unit that controls the rotation speed of the bucket, the rotation speed of the bucket, and the opening degree of the valve, and the temperature sensor is disposed below the bucket in the processing chamber. This is a frozen deburring device.

According to the frozen deburring method according to the present invention, by including the above-mentioned pre-cooling step, a method is adopted in which the deburring process is started after the temperature of the entire frozen deburring apparatus is in a stable state.
According to the present invention, by employing the above method, the temperature of the workpiece is stabilized at a low temperature and embrittlement of the workpiece is promoted, so that burrs can be efficiently removed. This shortens the deburring time and reduces refrigerant consumption. In addition, by shortening the time during which the shot material collides with the object to be processed, it is possible to prevent the object to be processed from being excessively polished and damaged.
Therefore, the workpiece 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 workpiece.

Moreover, according to the method for manufacturing a molded product according to the present invention, a method is adopted in which the molded product is deburred using the above-described freezing deburring method according to the present invention, and the molded product is manufactured.
According to the present invention, similarly to the above, by starting deburring when the temperature of the entire frozen deburring device is stable at a low temperature, the temperature of the molded product to be processed is stabilized at a low temperature, and embrittlement is promoted. Therefore, burrs can be removed efficiently. As a result, the deburring time can be shortened, and the time during which the shot material collides with the molded product can be shortened, making it possible to prevent the molded product from being excessively polished and damaged.

Further, according to the freezing deburring apparatus according to 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, as described above. The structure includes a control section that controls the opening degree of the valve.
According to the present invention, by adopting the above configuration, when starting the deburring process after the temperature of the entire frozen deburring apparatus is stabilized, the temperature of the workpiece is further stabilized at a low temperature, and the workpiece is embrittlement is further promoted, burrs can be removed efficiently. As mentioned above, this reduces deburring time, which reduces the consumption of refrigerant, and also reduces the time during which the shot material collides with the workpiece, preventing the workpiece from being excessively polished. It is possible to effectively suppress the occurrence of damage.
Furthermore, since the temperature sensor is placed 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 errors in measuring 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 frozen deburring apparatus is improved.

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 device according to an embodiment of the present invention, and is a cutaway view showing the internal configuration of the frozen deburring device. 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 is a block diagram schematically showing the electrical connection configuration within the frozen deburring apparatus. It is. 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 is a flowchart schematically showing each step included in the frozen deburring method. . 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 is a flowchart 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 freezing deburring method, a molded product manufacturing method, and a freezing deburring apparatus according to an embodiment of the present invention, and schematically shows the relationship between the cooling time in the precooling step and the internal temperature of the processing chamber. This is a graph shown in .

Hereinafter, a freezing deburring method, a molded product manufacturing method, and a freezing deburring apparatus, which are one embodiment of the present invention, will be described with reference to FIGS. 1 to 5 as appropriate.
Note that in the drawings used in the following description, characteristic parts may be shown enlarged or simplified for convenience in order to make the characteristics easier to understand. Furthermore, the materials and the like exemplified in the following description are merely examples, and the present invention is not limited thereto, and can be implemented with appropriate changes within the scope of the gist thereof.

The object to be treated (molded article) M to be deburred by the frozen deburring method, the molded article manufacturing method, and the frozen deburring apparatus of this embodiment is not particularly limited, but may include, for example, a plastic molded article, Examples include resin products such as rubber molded products, and metal products such as die-cast molded products.
That is, for example, molded products made by solidifying heated resin, rubber, or metal into a predetermined shape using a mold generally have burrs at positions corresponding to the joints of the molds, but the freezing burr removal method of this embodiment , a method for manufacturing a molded product, and a freezing deburring device can efficiently remove such burrs.

<Freezer deburring device>
Hereinafter, the configuration of the freezing deburring apparatus used in the freezing deburring method of this 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. Further, FIG. 2 is a block diagram schematically showing the electrical connection configuration within the frozen deburring apparatus 1. As shown in FIG.

The freezing deburring apparatus 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 input port 3a into which a workpiece M is input. The bucket 3 is opened and is provided with a bucket 3 that accommodates a workpiece M therein, and a shot machine 4 that projects a shot material S toward the workpiece M.

Further, the frozen deburring apparatus 1 of this embodiment includes a gearbox (bucket drive unit) 32 for rotating the bucket 3 with the workpiece M accommodated therein, and a gearbox (bucket drive unit) 32 for measuring the rotation speed R1 of the bucket 3. It has a bucket rotation sensor 35.
The shot machine 4 also includes 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 the impeller rotation speed. It has 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 adjusts the amount of refrigerant (not shown) injected into the internal space D of the processing chamber 2, and the temperature sensor 29 measures the internal temperature of the processing chamber 2. The rotation speed of the impeller 42 is determined based on the measurement signals 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 degree of the valve 28b.

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

In addition to the above-mentioned configurations, the refrigeration deburring device 1 of this embodiment further includes an exhaust section 11 and the above-mentioned valve 28b, as well as a refrigerant supply pipe 28a and a nozzle 28c for injecting refrigerant. A refrigerant supply section 28 and a door 5 that opens and closes the opening 21 of the processing chamber 2 are provided.
Each of the above-mentioned components is assembled into the casing 10 that serves as the framework of the entire frozen deburring device 1, or is provided so as to be housed in the casing 10.

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

The processing chamber 2 is provided with an opening 21 that opens on the front side of the frozen deburring device 1, and the bucket 3 is exposed to the outside through this opening 21, so that the workpieces stored in the bucket 3 before deburring can be removed. The structure is such that the workpiece M to be processed 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 as to be openable and closable, and the door 5 is configured so that the door 5 can be opened and closed when carrying in or out of the bucket 3 the workpiece M. There is.

In addition, a plate (not shown) is arranged outside the opening 21 in the processing chamber 2 in a plan view and has a surrounding shape in a plan view. An invisible sealing material is fixed.

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

The processing chamber 2 is connected to the refrigerant supply section 28 described above, and by supplying a refrigerant (not shown) from the refrigerant supply section 28 toward the inside of the processing chamber 2, the processing chamber 2 (internal space D ) is configured to be cooled. The refrigerant supply section 28 includes, for example, a tank for storing refrigerant, a refrigerant supply pipe 28a in which a valve 28b is installed, and a nozzle 28c for injecting refrigerant toward the internal space D of the processing chamber 2. can be adopted.

In the example shown in FIG. 1, the refrigerant supply section 28 is operated by a valve 28b in response to a command from the control section 13 in accordance with the internal temperature T of the processing chamber 2 measured by a temperature sensor 29 disposed below the bucket 3. By automatically opening and closing, 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, for example, by 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 between the tank constituting the refrigerant supply section 28 and the nozzle 28c via the refrigerant supply pipe 28a, and adjusts the amount of refrigerant injected 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 constituted by, for example, an electromagnetic valve.

The injection amount of the refrigerant described above can be increased or decreased by, for example, controlling the valve 28b on/off based on the measured internal temperature T of the processing chamber 2 and a pre-set precooling 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 increased by fully closing the valve 28b.

As the refrigerant used for cooling the processing chamber 2 and ultimately cooling the processing object M, an inert substance that can cool the processing object M below the embrittlement temperature can be used, such as liquefied nitrogen, Examples include refrigerants made of liquefied inert gas such as liquefied carbon dioxide.

Furthermore, in this embodiment, as in the example shown in FIG. 1, a configuration including an exhaust section 11 made of a pipe for discharging vaporized gas containing a refrigerant generated in the processing chamber 2 into the atmosphere can be adopted. The exhaust section 11 includes, in addition to the exhaust pipe, a damper (not shown) that restricts the inflow of atmospheric air into the processing chamber 2, and a dust collector (not shown) that collects dust generated in the processing chamber 2. A configuration with

As described above, the temperature sensor 29 measures the internal temperature T of the processing chamber 2, and this measured value is sent 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, right below the bucket 3. That is, the temperature sensor 29 is placed below the bucket 3 at a position where the shot material S projected from the shot machine 4 and the refrigerant jetted from the nozzle 28c, which will be described in detail later, do not flow directly. be done. This makes it difficult for the shot material S and the refrigerant to directly touch the temperature sensor 29, so that the measurement error of the internal temperature T of the processing chamber 2 can be suppressed to a minimum. Thereby, the internal temperature T of the processing chamber 2 can be accurately measured, so that the accuracy of the control process in the entire frozen deburring apparatus 1 is improved, as will be described in detail later.
Specifically, the shot material S and the refrigerant generally come into contact with the temperature sensor 29 indirectly after once contacting the outer surface of the bucket 3 and the wall surface of the processing chamber 2, so that the measured value by the temperature sensor 29 This makes it possible to minimize the impact on

The temperature measuring means constituting the temperature sensor 29 is not particularly limited, and any means can be used as long as it can measure the temperature during deburring. For example, a general Examples include those consisting of thermocouples.

The bucket 3 is installed in the processing chamber 2, and consists of a generally cylindrical cage-like member with a swollen bottom side wall, which rotates around an axis while accommodating the processing object M therein. The bucket 3 is made of, for example, a perforated plate having through holes through which the shot material S projected from the shot machine 4, the details of which will be described later, can pass through.

As described above, the frozen deburring apparatus 1 of this embodiment includes a gearbox 32 that rotates the bucket 3 with the workpiece M accommodated therein, and a bucket rotation sensor 35 that measures the number of rotations of the bucket 3. have.

Furthermore, the bucket 3 used in this embodiment is horizontally rotatably attached to the gearbox 32 to which the other end side of the pair of rotating shafts 32c and 32c is attached, so that the bucket 3 can be attached to the inside of the processing chamber 2. It is installed so as to float within space D. One end side of the pair of rotation shafts 32c, 32c is attached to both side walls of the housing 10 so that the pair of rotation shafts 32c, 32c are coaxial.

Inside the gearbox 32, the rotary motion of a bucket rotation motor (bucket drive unit) 32a provided integrally with the gearbox 32 is transferred to a cylinder via a rotation transmission shaft connected to the bucket rotation motor 32a. A rotation transmission mechanism is provided that rotates the shaped bucket 3 in forward and reverse directions about an 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 to mesh with the small bevel gear, and one end fixed to the large bevel gear. and a bucket shaft 32b whose other end is attached to the bottom surface of the bucket 3.
Further, the rotation speed of the bucket rotation motor 32a is controlled by the control unit 13.

Also, in the housing 10, by rotating one of the rotation shafts 32c, the input port 3a of the bucket 3 can be moved to a desired position in the processing chamber 2, or the input port 3a of the bucket 3 can be A bucket rotating means (not shown) is provided, which is capable of moving the workpiece M to the outside of the apparatus beyond the opening 21 and placing the workpiece M in a position where it can be carried into or taken out of the bucket 3.

Although detailed illustrations are omitted, the above-mentioned bucket rotation means is connected to a bucket rotation motor capable of forward and reverse rotation, and a drive shaft of this bucket rotation motor, and is connected in the axial direction of the drive shaft. An output shaft that outputs output in a perpendicular direction, a drive pulley attached to this output shaft, a pulley attached to one of the rotating shafts 32c at a position corresponding to this drive pulley, and this pulley and the above drive pulley. It consists of a belt that is stretched across the body. Further, the bucket rotating means is configured such that, for example, the position of the bucket 3 is the position where 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. The configuration may include a sensor using the pulley described above to detect each position and stop the bucket drive motor.

As described above, the bucket rotation sensor 35 measures the rotation speed R1 when the bucket 3 rotates around the axis, and the measurement signal of this rotation speed R1 is sent via an A/D converter or the like. The information is sent to the control unit 13.
The rotation speed measuring means used in the bucket rotation sensor 35 is not particularly limited, and a general rotation speed detection element or the like can be used without any restriction.

The door 5 opens and closes the opening 21 of the processing chamber 2, and is configured to be freely openable and closable using, 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 carrying the workpiece M into or out of the bucket 3. The door 5 improves the cooling efficiency of the internal space D and the workpiece M by covering the opening 21 of the processing chamber 2 when deburring the workpiece M in the processing chamber 2. This has the effect of making possible deburring processing possible.

For example, the door 5 may have a structure that opens and closes with respect to the opening 21 of the processing chamber 2 in a so-called pull-down manner, or may have another structure.

The sorter 7 separates the shot material S containing waste such as burrs, which falls downward from the 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 is sorted into burrs smaller in size than the shot material S.
Specifically, although detailed illustration is omitted, the sorter 7 shown in FIG. 1 includes a vibrating sieve for large burr sorting equipped with a large burr storage tank, and a shot material sorter having a shot material storage tank 73 and a small burr storage tank. and a sorting section equipped with a vibrating sieve.
With the above configuration, the sorter 7 sorts out the shot material S containing waste such as burrs, which is dropped and discharged from the processing chamber 2 via the hopper 25, without coming into contact with the outside air.

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

More specifically, the impeller rotation 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 generates negative pressure by causing rotational movement by the impeller rotation motor 43, and sucks up the shot material S from the shot material storage tank 73 described above. The shot material S that has been sucked up collides with the impeller 42 and is then projected toward the bucket 3.
Further, the rotation of the motor used for the impeller rotation motor 43 is controlled by the control unit 13 .

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

Further, in this embodiment, when the door 5 covers the opening 21 and is closed, it is more preferable that the input port 3a of the bucket 3 and the projection port 4a of the shot machine 4 are arranged to face each other. .
In this way, since the input port 3a of the bucket 3 and the projection port 4a of the shot machine 4 face each other, the shot material S can be efficiently projected onto the workpiece M, resulting in efficient deburring processing. becomes possible.

As described above, the impeller rotation sensor 44 measures the rotation speed R2 of the impeller 42 rotated by the impeller rotation motor 43, and the measurement signal of this rotation speed R2 is similar to that of the rotation speed R1 of the bucket 3. , 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 in the impeller rotation sensor 44 is not particularly limited, and a general rotation speed detection element or the like can be used without any restriction.

The materials used for each structural member of the frozen deburring device 1 of this embodiment are not particularly limited, and can be selected as appropriate. For example, considering that the freezing deburring apparatus 1 of this embodiment cools the processing chamber 2, the object to be processed M, etc., and will also cool the surrounding members, the materials of each member may include: From the viewpoints of strength, rust prevention, low temperature resistance, etc., it is preferable to use stainless steel material.

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 rotation speed R2 of the impeller 42, the rotation speed R1 of the bucket 3, and the opening degree of the valve 28b are controlled.
That is, as shown in FIG. 2, the control unit 13 is electrically connected to a temperature sensor 29, a bucket rotation sensor 35, an impeller rotation sensor 44, an input device 13a, and a display device 13b.
Furthermore, the control unit 13 includes a valve 28b that adjusts 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. It is electrically connected via 13C.

The input device 13a includes an interface including, for example, touch keys. The input device 13a sets, for example, the selection of the deburring mode, the rotation speed R1 of the bucket 3, the rotation speed R2 of the impeller 42, the pre-cooling temperature PT, and the internal temperature T of the processing chamber 2 during the deburring process.

The display device 13b includes, for example, a display, an LED indicator, or the like. The display device 13b displays, for example, the internal temperature T of the processing chamber 2, the rotation speed R1 of the bucket 3, the rotation speed R2 of the impeller 42, and the like. Furthermore, the display device 13b also displays information input using the input device 13a described above.

In addition, in the freezing deburring apparatus 1 of the present embodiment, a sealing material (not shown) can be provided in order to improve the airtightness of the processing chamber 2 (internal space D) in which the opening 21 is covered by the door 5. . The sealing material is, for example, a long member that is installed along a frame (not shown) that is arranged so as to surround the opening 21 of the processing chamber 2, and that is arranged so as to have an encircling shape as a whole in a plan view. Become. The sealing material can be fixed to the frame, for example, by being bonded to the frame (not shown) or by being held 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 acts to seal between the door 5 and the opening 21 by being compressed between the door 5 and a frame (not shown). is obtained.

The sealing material has a long shape, for example, a string shape in a plan view, and is made of an elastic material having excellent cold resistance (low temperature resistance). The elastic material constituting such a sealing material is not particularly limited, but includes rubber materials such as nitrile rubber and silicone rubber.

Further, the sealing material may have, for example, a hollow structure along the longitudinal direction, and a plurality of long protrusions formed continuously in the longitudinal direction of the sealing material are provided on the surface of the sealing material. This compresses the sealing material when the door 5 is closed, making it possible to further improve the sealing performance of the processing chamber 2 (internal space D).

Further, the sealing material may have a shape that completely connects along the opening 21 of the processing chamber 2 in a plan view, but for example, a sealing material made of a plurality of members that is divided at least partially in the longitudinal direction may be used. It can also be used as wood. By dividing the sealing material into a plurality of members in this manner, it is possible to obtain the effect of improving workability when fixing the sealing material to the frame arranged around the opening 21. Moreover, since the sealing material can be fixed in stages from the portion that is deformed to follow the shape of the processing chamber 2, the work of installing the sealing material is facilitated. In addition, by arranging the sealing material in the form of a string in a surrounding shape in plan view, it is possible to form the sealing material into a shape that corresponds to the opening 21 of the processing chamber 2 without customizing the sealing material. The cost of the device 1 can be reduced.

Further, although not shown, the sealing material may have 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 drops to a predetermined temperature, the sealing material is prevented from being hardened by electrical heating.
Generally, resin materials such as rubber as described above are 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 decreasing, so that a remarkable effect of improving sealing performance and sealing durability can be obtained.

Note that the above-mentioned "surrounding shape in plan view" includes a shape that is arranged and formed in a long length so as to surround the center in plan view. It also includes shapes.

The refrigeration deburring apparatus 1 of this embodiment is 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, and the rotation speed R2 of the impeller 42 and the rotation speed R2 of the bucket 3. It includes a control section 13 that controls the rotation speed R1 and the opening degree of the valve 28b. As a result, when starting the deburring process after the temperature of the entire frozen deburring device 1 is stabilized, the temperature of the workpiece M is further stabilized at a low temperature, and embrittlement of the workpiece M is further promoted. Therefore, burrs can be removed efficiently. As a result, the deburring time is shortened, so the amount of refrigerant consumed can be suppressed, and the time during which the shot material S collides with the workpiece M is shortened, so that the workpiece M is not excessively polished. It is possible to effectively suppress the occurrence of damage.
Furthermore, since the temperature sensor 29 is arranged below the bucket 3 in the processing chamber 2, it becomes difficult for the shot material S and the refrigerant to directly touch the temperature sensor 29, so that the internal temperature T of the processing chamber 2 can be reduced. Measurement errors can be minimized. Thereby, the internal temperature T of the processing chamber 2 can be accurately measured, so that the accuracy of the control process in the entire frozen deburring apparatus 1 is improved.

<Frozen deburring method>
Next, the procedure of the frozen deburring method of this embodiment will be explained in detail.
In this embodiment, a procedure for deburring a workpiece M using the frozen deburring device 1 of this embodiment shown in FIGS. 1 and 2 will be illustrated, and the configuration of the frozen deburring device 1 will be described as follows. , as described above, will be explained with reference to FIGS. 1 and 2, and further explained with reference to FIGS. 3 to 5 as appropriate.

FIG. 3 is a flowchart schematically showing each step included in the frozen deburring method of this embodiment. Moreover, FIG. 4 is a flowchart showing in detail the pre-cooling process provided in the frozen deburring method of this embodiment. Further, FIG. 5 is a graph schematically showing the relationship between the cooling time in the pre-cooling step and the internal temperature of the processing chamber.

The freezing deburring method of this 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 containing a workpiece M therein, and a bucket 3 directed toward the workpiece M. This is a method of deburring a workpiece M using a freezing deburring apparatus 1 equipped with a shot machine 4 that projects a shot material S using a refrigeration method.
In the freezing deburring method of this embodiment, as shown in the flowcharts of FIGS. 3 and 4 (see also FIGS. 1 and 2), the internal temperature T of the processing chamber 2 is measured, and the measured internal temperature T and , a pre-cooling process (pre-cooling mode) in which the inside of the processing chamber 2 is pre-cooled while increasing or decreasing the injection amount of refrigerant based on a pre-set pre-cooling temperature PT, and a workpiece M is introduced into the pre-cooled processing chamber 2. and a deburring process (deburring mode) for removing burrs.

When deburring the workpiece M using the frozen deburring method of this embodiment, as shown in the flowchart of FIG. 3, the operator first selects the power transport mode by operating the input device 13a. . 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 performing deburring work continuously, the entire frozen deburring device 1 has already been cooled and the temperature is stable at a low temperature when performing the second and subsequent deburring processes. 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 this pre-cooling mode and the temperature is kept in a low and stable state, and then the deburring mode is selected. implement.

In the precooling mode, for example, the frozen deburring device 1 is operated idly at a predetermined precooling temperature PT and a predetermined precooling time, so that the entire frozen deburring device 1 can be cooled. Here, the idle operation described in the present invention refers to rotating the bucket 3 and the impeller 42 of the shot machine 4 while cooling the inside of the processing chamber 2 without storing the object M in the bucket 3. This refers to the operation of circulating the shot material S within the frozen deburring device 1.

When the pre-cooling mode is performed in the dry operation as described above, the pre-cooling temperature PT and the pre-cooling time can be appropriately determined depending on the heat capacity, cold storage performance, etc. of the frozen deburring device 1. Here, the precooling time in the present invention refers to the time from the time when injection of refrigerant from the nozzle 28c is started to the time when the injection is ended.

The pre-cooling mode (pre-cooling step) 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, from the viewpoint of stabilizing the internal temperature T of the processing chamber 2 at a low temperature, it is more preferable to carry out the precooling mode in multiple steps.

Hereinafter, the precooling mode will be described in more detail with reference to the flowchart of FIG. 4 and the graph of FIG. 5 (see also FIGS. 1 and 2).
First, the operator who has selected the precooling mode by operating the input device 13a successively selects 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 temperature difference). (see the temperature at the time of cooling) and the precooling time of each cooling step are set from the input device 13a. That is, as shown in FIG. 4, by operating the input device 13a, the number n of repetitions of the pre-cooling step, the n-th set temperature, and the n-th pre-cooling time in the pre-cooling mode are set (see S1 in FIG. 4). ).

Thereafter, when the operation in the precooling mode is started, the bucket rotation motor 32a and the impeller rotation motor 43 are operated in response to a signal from the control unit 13, thereby starting the idle operation (see S2 in FIG. 4). ).
The rotation speed R1 of the bucket 3 and the rotation speed R2 of the impeller 42 in the pre-cooling mode are not particularly limited, but from the viewpoint of stabilizing the temperature of the entire device, the deburring mode (deburring process) described below It is preferable that the conditions are the same as the rotational speeds R1 and R2 scheduled in .

After the rotation speed R1 of the bucket 3 and the rotation speed R2 of the impeller 42 reach the planned rotation speed and the dry operation state is stabilized, the valve 28b is opened in response to a signal from the control unit 13, and the inside of the processing chamber 2 is A refrigerant (for example, liquefied nitrogen) is injected 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 transmitted 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 (achieved temperature: temperatures T1, T2, T3 shown in FIG. 5, or the temperature during deburring), and the set temperature is set. If the opening degree of the valve 28b has not been reached, the control unit 13 controls the valve 28b to further increase its opening degree. On the other hand, when the internal temperature T of the processing chamber 2 reaches the target temperature, the control unit 13 controls the opening degree of the valve 28b to be lowered (see S4 in FIG. 4).

Here, when performing the precooling mode with a plurality of precooling steps, the control unit 13 sends a signal to increase the opening degree of the valve 28b after each precooling time (the nth precooling time shown in FIG. 4) has elapsed. By sending it out, the processing chamber 2 is controlled to be cooled to the temperature reached in the next precooling step (see also S5 shown in FIG. 4 and the first to fourth 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. The precooling mode is ended by transmitting a stop signal to 43 and stopping the idle operation (see S7 in FIG. 4 and the end of precooling shown in FIG. 5).

Note that the temperature during deburring shown in the graph of FIG. 5 is not particularly limited, but may be set to a temperature at which the workpiece M becomes brittle or lower. In particular, when the object M is made of resin or rubber, it is preferable to cool it to a temperature below the glass transition temperature, but the cooling temperature may be above 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 input port 3a of the bucket 3 is set to face the opening 21 side. , a bucket 3 accommodates a workpiece M to be deburred.
At this time, it is preferable that the time for opening the door 5 is as short as possible from the viewpoint of maintaining the entire frozen deburring device 1 at a low temperature.

Next, an impeller 42 provided in the shot machine 4 is rotated at a predetermined rotational speed based on a signal from the control unit 13. Thereby, the shot material S is sucked up from the shot material storage tank 73 via the suction hose 41, and is projected toward the bucket 3 from the projection port 4a. At this time, the shot material S passes through the through hole formed in the bucket 3 and collides with the workpiece M to remove burrs from the workpiece M. Furthermore, as the bucket 3 rotates at a predetermined speed, the workpiece M accommodated therein is stirred.

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 the sorter 7 is equipped with a vibration for large burr sorting (not shown). In the sieve, large burrs are collected into a large burr storage tank. On the other hand, the shot material S and small burrs that have passed through the vibrating sieve for large burr sorting are separated into shot material S and small burrs by a vibrating sieve for shot material sorting (not shown), and the shot material S is transferred to the shot material storage tank 73. Small burrs are stored in a small burr storage tank (not shown).
As each sorting means including the above-mentioned sieve, any known one can be used without any restriction.

According to the above procedure, the shot material S is circulated and used among 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, Since they operate in conjunction with each other, the shot material S does not stay in the path and deburring can be performed with high efficiency.

After burrs are removed from the workpiece M in the bucket 3 by projecting the shot material S, 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 input port 3a of the bucket 3 is again directed to the opening 21 side.
Next, after taking out the workpiece M from which burrs have been removed from the bucket 3, the workpiece M to be deburred next is stored in the bucket 3, and the door 5 is closed again to open the opening 21. cover.
Next, as described above, after the temperature of the workpiece M becomes below 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. Then, the workpiece M accommodated in the bucket 3 is deburred.
As a result, the same deburring process described above can be repeated.

Below, the effects obtained by the frozen deburring method of this embodiment will be explained in more detail.
According to the frozen deburring method of the present embodiment, the deburring process is started after the above-mentioned pre-cooling step is performed and the temperature of the entire frozen deburring device 1 becomes low and stable, so the frozen deburring process is started. Since the deburring process is started with the entire apparatus 1 cooled in advance, embrittlement of the object to be processed is promoted, and burrs can be efficiently removed. As a result, the deburring time can be shortened and the amount of refrigerant consumed can also be suppressed. Moreover, since the time during which the shot material S collides with the workpiece M can be shortened, damage to the workpiece M caused by excessive polishing can be suppressed. Furthermore, since the deburring process can always be carried out at a stable temperature, the quality of the workpiece M after deburring is stable even if there is a difference in lots or seasonal fluctuations in the ambient temperature, for example.

Moreover, according to the frozen deburring method of this embodiment, by setting the precooling mode (precooling process) to a method in which the frozen deburring device 1 is cooled in an idle operation state, the cooled shot material S is cooled inside the device. The temperature of the entire device quickly becomes uniform at a low temperature. Further, as the bucket 3 rotates, cold heat is easily transmitted to the inside of the drive unit such as the gear box 32, so that the temperature of the entire apparatus quickly becomes uniform at a low temperature, as described above. Since the deburring process is performed in a state where the temperature of the entire apparatus is uniform, temperature changes in the deburring process can be suppressed. This promotes the embrittlement of the workpiece M, so that the deburring time can be shortened and the amount of refrigerant consumed can also be suppressed. In addition, since the time during which the shot material S collides with the object M can be shortened, it is possible to further prevent the object 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 is a difference in lots or seasonal fluctuations in the ambient temperature, for example.

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 in stages, so that the internal temperature T of the processing chamber 2 is lower than the set burr. It is possible to suppress the cycling phenomenon in which the temperature rises and falls with respect to the temperature. In particular, since the internal temperature T of the processing chamber 2 can be prevented from overshooting excessively beyond the deburring temperature, the temperature of the processing chamber can be quickly stabilized at a low temperature, and the amount of refrigerant to be processed can also be reduced.

<Method for manufacturing molded products>
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 the present embodiment is a method for manufacturing a molded product by removing burrs from the molded product using the freezing deburring method according to the embodiment described above. Therefore, in the following description, as above, reference will be made to FIGS. 1 to 5, and detailed descriptions of the procedures and conditions will be omitted.

The molded products to which the manufacturing method of the present embodiment is applied include those similar to the object to be processed M as described above, such as resin products such as plastic molded products and rubber molded products, die-cast molded products, etc. metal products.

According to the molded product manufacturing method of the present embodiment, similarly to the above, by starting deburring when the temperature of the entire frozen deburring device 1 is low and stable, the temperature of the molded product (workpiece M) is reduced. It is stable at low temperatures and promotes embrittlement, so burrs can be removed efficiently. As a result, the deburring time can be shortened, and the time during which the shot material S collides with the molded product can be shortened, so that it is possible to prevent the molded product from being excessively polished and damaged.

<Other forms>
As mentioned above, although an example of the freezing deburring method, the manufacturing method of a molded article, and the freezing deburring apparatus which concern on this invention were demonstrated by embodiment, this invention is not limited to the said embodiment. The configurations and combinations thereof in the embodiments described above are merely examples, and additions, omissions, substitutions, and other changes to the configurations are possible without departing from the spirit of the present invention.

For example, in this embodiment, an example is given in which the door 5 opens and closes using a hinge (not shown) provided on the lower side of the door 5 as a fulcrum, which is a so-called pull-down method. is not limited. As for the opening/closing structure of the door, for example, a single-opening structure with a hinge provided on either the left or right side of the door may be adopted, or by optimizing the mounting structure of the bucket 3, etc. , a double door system, that is, a so-called double door structure may be adopted.

<Effect>
As explained above, according to the frozen deburring method of the present embodiment, by including the above-mentioned pre-cooling step, the deburring process is started after the temperature of the entire frozen deburring device 1 is in a stable state. is adopted.
By employing the method described above, the frozen deburring method of this embodiment stabilizes the temperature of the workpiece M at a low temperature and promotes embrittlement of the workpiece M, thereby efficiently removing burrs. can. This shortens the deburring time and reduces refrigerant consumption. Furthermore, by shortening the time during which the shot material collides with the object M, it is possible to prevent the object M from being excessively polished and damaged.
Therefore, the workpiece M can be cooled to a stable temperature to promote embrittlement, and the deburring process can be performed in a short time and at low cost without damaging the workpiece M.

Further, according to the method for manufacturing a molded product of the present embodiment, a method for manufacturing a molded product by deburring a molded product (workpiece M) using the freezing deburring method of the present embodiment described above. We are hiring.
According to the molded product manufacturing method of the present embodiment, similarly to the above, by starting deburring when the temperature of the entire frozen deburring device 1 is low and stable, the temperature of the molded product, which is the workpiece M, is reduced. It is stable at low temperatures and promotes embrittlement, so burrs can be removed efficiently. As a result, the deburring time can be shortened, and the time during which the shot material collides with the molded product can be shortened, making it possible to prevent the molded product from being excessively polished and damaged.

Further, according to the freezing deburring apparatus 1 of the present embodiment, the impeller is 42, the rotation speed R1 of the bucket, and the opening degree of the valve 28b.
According to the frozen deburring device 1 of this embodiment, by employing the above configuration, when starting the deburring process after the temperature of the entire frozen deburring device 1 is stabilized, the temperature of the workpiece M is Since it is more stable at low temperatures and the embrittlement of the workpiece M is further promoted, burrs can be removed efficiently. As a result, as described above, the amount of refrigerant consumption can be suppressed by shortening the deburring time, and the time during which the shot material S collides with the workpiece M is shortened, so that the workpiece M is not excessively This can effectively prevent damage caused by polishing.
Furthermore, since the temperature sensor 29 is arranged below the bucket 3 in the processing chamber 2, it becomes difficult for the shot material S and the refrigerant to directly touch the temperature sensor 29, so that the internal temperature T of the processing chamber 2 can be reduced. Measurement errors can be minimized. Thereby, the internal temperature T of the processing chamber 2 can be accurately measured, so that the accuracy of the control process in the entire frozen deburring apparatus 1 is improved.

As described above, the frozen deburring method of the present invention can accelerate embrittlement by cooling the workpiece to a stable temperature, and can deburr the workpiece in a short time and at low cost without damaging the workpiece. This is a method that allows for processing. Therefore, the present invention is extremely useful in, for example, a method for removing burrs from objects to be treated such as resin products and metal products by shot blasting, a method for manufacturing molded products, and a freezing burr removal apparatus.

1... Refrigeration deburring device 2... Processing chamber 2A... Composite plate 21... Opening 24... Discharge hole 25... Hopper 28... Refrigerant supply section 28a... Refrigerant supply pipe 28b... Valve 28c... Nozzle 29... Temperature sensor D... Internal space 3 ...Bucket 3a...Input port 32...Gear box 32a...Bucket rotation motor (bucket drive unit)
32b...Bucket axis 32c...Rotation axis (pair of rotation axes)
35... Bucket rotation sensor 4... Shot machine 4a... Projection port 41... Suction hose 42... Impeller 43... Impeller rotation motor (shot machine drive unit)
44... Impeller rotation sensor 5... Door 7... Sorter 73... Shot material storage tank 10... Housing 11... Exhaust section 13... Control section 13A... Valve drive circuit 13B... Motor drive circuit for bucket rotation 13C... Motor drive circuit for impeller rotation 13a...Input device 13b...Display device M...Workpiece S...Shot material

Claims (5)

a processing chamber cooled by a refrigerant;
a bucket disposed in the internal space of the processing chamber and accommodating the object to be processed therein;
A method for deburring the workpiece using a frozen deburring device comprising a shot machine that projects shot material toward the workpiece, the method comprising:
a pre-cooling step of measuring the internal temperature of the processing chamber and pre-cooling the inside of the processing chamber while increasing or decreasing the injection amount of refrigerant based on the measured internal temperature and a pre-set pre-cooling temperature;
a deburring step of charging the workpiece into the pre-cooled processing chamber and deburring it;
A freezing deburring method , wherein the pre-cooling step includes a plurality of pre-cooling steps . The frozen deburring method according to claim 1, wherein in the pre-cooling step, the frozen deburring device is cooled in an idle state. A method for producing a molded product, comprising removing burrs from the molded product by the freezing burr removal method according to claim 1 . 4. The method for manufacturing a molded product according to claim 3, wherein in the pre-cooling step, the freezing deburring device is cooled in an idle state. a processing chamber cooled by a refrigerant;
a bucket disposed in the internal space of the processing chamber and accommodating the object to be processed therein;
There is a freezing deburring device comprising a shot machine that projects 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 includes an impeller that is rotated by a shot machine drive 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 that adjusts an injection amount of the refrigerant into the internal space of the processing chamber;
of the impeller based on each measurement signal of 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 control unit that controls the rotation speed, the rotation speed of the bucket, and the opening degree of the valve;
Equipped with
A freezing deburring apparatus characterized in that the temperature sensor is disposed below the bucket in the processing chamber.

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