JP2005022132A - Gate cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gate cutting device capable of perfectly eliminating the occurrence of flash in a gate part cutting process without lowering the degree of freedom in the design of the gate part in an injection-molded product of high precision such as a lamp being the constituent part of an HDD device. <P>SOLUTION: The gate cutting device 300 is equipped with a cutting device 301 for forming a notch 36 at the cutting scheduled position of the gate part 35 of a molded product 20 by a cutting blade 305 and an ultrasonic vibration device 302 for applying ultrasonic vibration to the runner part 40 of the molded product 20 to separate the gate part 35 at the part of the notch 36. When ultrasonic vibration is applied to the runner part 40 in a state that the runner part 40 of the molded product 20 is grasped by the contact members 311 and 310 provided to the leading end of the ultrasonic vibrator 314 of the ultrasonic vibration device 302, ultrasonic vibration acts on the residual part 37 of the notch 36 to cause the concentration of stress and the notch 36 is cut before long by fatigue destruction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gate cutting device for cutting a gate portion of a high-precision injection-molded product, and more particularly to a gate cutting device for manufacturing a lamp for an information recording disk device.
[0002]
[Prior art]
A hard disk drive device (hereinafter referred to as “HDD device”), which is an information recording disk device used in an information processing apparatus such as a computer, is composed of one or a plurality of magnetic recording disks driven at high speed and a recording disk. A magnetic head for reading information recorded on the upper and lower surfaces and a suspension arm for holding the magnetic head are provided, and information is read and written while the magnetic head is moved by the suspension arm.
[0003]
The magnetic head is supported by a suspension arm driven by an actuator and moves on the recording disk at a high speed, but the magnetic head and the recording disk are not in contact with each other, and the action of the air flow generated by the rotation of the recording disk Thus, the magnetic head is in a state of floating from the recording disk by a minute distance.
[0004]
The magnetic head has a structure that does not come into contact with the recording disk while the recording disk is stopped. This is because if the magnetic head and the recording disk that has stopped rotating are brought into contact with each other for a long time, the magnetic head adheres to the surface of the recording disk, and if the recording disk rotates in this state, the surface of the recording disk may be damaged by the magnetic head. It is because it may be damaged.
[0005]
In general, in order for the magnetic disk to float from the surface of the recording disk, the recording disk needs to reach a predetermined number of rotations. Therefore, when the recording disk does not reach the predetermined rotation speed, it is necessary to keep the magnetic head away from the recording disk so that the magnetic head does not contact the recording disk. Therefore, a holding mechanism called a ramp has been used as means for holding the magnetic head and the suspension arm in a state of being separated from the recording disk when the recording disk has a predetermined number of revolutions or less.
[0006]
As a lamp used in a conventional HDD device, for example, there is a lamp described in Patent Document 1. In general, most of the lamps are formed of thermoplastic resin, but there are lamps in which only a screw portion for mounting in the HDD device is formed of metal. 7 and 9 described in Patent Document 1, the gap between the recording disk 17 and the upper surface and the lower surface of the opening 26 of the lamp 20 is set to about several tens of μm. A plurality of parts are required to have a high level of dimensional accuracy corresponding to this.
[0007]
In recent years, the types of products in which HDD devices are used have increased, and as the products themselves have been downsized, the HDD devices have also tended to be downsized. Also, as a matter of course in the field of personal computers or notebook personal computers, HDD devices tend to be built into small electronic devices such as digital cameras. Therefore, it is necessary to miniaturize the components of the HDD device, and the overall length of the lamp is reduced to about 5 to 6 mm. Thus, the lamp is required to have a high level of dimensional accuracy and miniaturization.
[0008]
Furthermore, due to the nature of HDD devices, it is required that impurities such as dust do not enter the device at all in the manufacturing process. This is because the gap between the recording disk and the magnetic head floating above the surface is about several tens of μm, and the gap between the recording disk and the guide portion is set to be approximately the same in the ramp as the magnetic head holding mechanism. For this reason, if impurities such as dust are present, when the recording disk rotates, the impurities may get caught in the gaps described above, resulting in problems such as loss of information recording. In the worst case, rotation is impossible. This is because a serious problem occurs that the device itself does not function.
[0009]
Therefore, it is necessary to eliminate the occurrence of burrs that may become impurities such as dust in the manufacturing process of the molded product constituting the lamp. Furthermore, when an impact is applied to the HDD device itself or vibration occurs, the burrs that exist on the various components in the device must not be removed. It is necessary to eliminate it.
[0010]
Here, a conventional lamp manufacturing process will be described. First, an injection molded product including a runner part, a gate part, a product part, and the like is formed by an injection molding device. At this time, if it is a specification to embed a metal part, it is simultaneously formed as insert molding. Next, after cutting the gate part between the runner part and the product part of the injection-molded product with a cutting blade, the product part is inspected using an image processing device to select a good product and a defective product. Pack in product tray. Then, a series of processes are performed in which the product part is cleaned in units of trays to remove impurities such as dust and tiny burrs, then dried, subjected to appearance inspection, and shipped.
[0011]
The following two methods are typical as the method for cutting the gate portion in the gate portion cutting process described above. The first cutting method is to cut the gate portion by pulling apart in the opposite direction in a state where the runner portion and the product portion of the injection-molded product are fixed, and the second cutting method uses a cutting blade. The gate portion is cut.
[0012]
In the case of the first cutting method, since the cut gate portion is torn off, the appearance is poor and the product portion may be partially deformed. In the case of the second cutting method, the core layer on the cut surface is satisfactory, but burrs may occur in the skin layer that is the last cut portion in the cutting step.
[0013]
Here, with reference to FIG. 9, the core layer of an injection molded product, a skin layer, and the mechanism which a burr | flash generate | occur | produces in a skin layer in the 2nd cutting method are demonstrated. FIGS. 9A and 9B are diagrams showing a cutting process by a conventional gate cut device, and FIG. 9C is a cross-sectional view taken along the line HH in FIG. 9B.
[0014]
In the molding process of the injection molded product 90 as shown in FIG. 9 (a), when the molten resin flows in the mold, the flow in the center is the fastest and the temperature of the resin decreases as it approaches the mold. A layer that hardly flows is formed very close to the mold surface. This layer is a layer called a skin layer. As shown in FIG. 9C, the layer located in the central portion surrounded by the skin layer 91 is the core layer 92. The skin layer 91 is composed of molecular chains aligned in the flow direction of the resin, exhibits a function of maintaining the strength of the molded product 90 with the molecular chains being strongly oriented, and the core layer 92 is perpendicular to the flow direction of the resin. It is composed of molecular chains oriented in the direction.
[0015]
As shown in FIG. 9A, when the gate portion 93 between the runner portion 98 and the product portion 97 of the molded product 90 is cut with the cutting blade 94, in the process of cutting the gate portion 93, Stress is generated in the Z direction depending on the thickness of the cutting blade 94. Until the gate portion 93 is plastically deformed, it is sheared by the cutting blade 94. However, when the tip of the cutting blade 94 exceeds the plastic deformation region, the gate portion 93 is broken by the action of the stress Z described above. .
[0016]
That is, as shown in FIG. 9B, the tip of the cutting blade 94 approaches the skin layer 91 which is the final portion of the gate portion 93, and the cutting edge of the cutting blade 94 is cut along the cutting line 99 as shown in FIG. The skin layer 91 breaks along the break line 95, for example. At this time, since the region of the skin layer 91 is peeled off integrally due to the property caused by the molecular chain structure strongly oriented along the flow direction, the burrs 96 are generated. Such a type of burr 96 may be fixed to the product portion 97 even after completion of cutting, but it may fall off after being incorporated into the subsequent process or HDD device. Is judged as a defective product.
[0017]
Therefore, a fusing technique using ultrasonic waves has been proposed in order to completely eliminate the burrs generated when the gate portion is cut as described above (see, for example, Patent Document 2). In the technique described in Patent Document 2, an injection molded product is placed in a receiving jig, and the horn descends while performing ultrasonic vibration, and comes into contact with the runner portion. As a result, ultrasonic vibration acts on the runner portion, and stress concentrates on the connection portion where the thickness is thinnest and is melted.
[0018]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-229634 (pages 3-9, FIGS. 7, 9)
[Patent Document 2]
JP-A-8-142134 (page 3-7)
[0019]
[Problems to be solved by the invention]
In the case of the fusing technique described in Patent Document 2, since the fusing position is limited to the thinnest part of the gate part, the shape of the fusing part of the gate part is inevitably limited, and the degree of freedom in design. Is constrained. In the component parts of the HDD device, for example, the lamp, as described above, the molded product is downsized and high dimensional accuracy is required. Therefore, it may be unavoidable to have a disadvantageous design, and there is a possibility that an ideal flow of the molten resin cannot be established in the mold during injection molding. That is, there is a possibility that molding defects such as a sink due to a poor flow of the molten resin and a loss of appearance or an unfilled (void) may occur.
[0020]
The present invention completely eliminates the generation of burrs in the cutting process of the gate part without reducing the degree of freedom in designing the gate part of a highly accurate injection molded product such as a lamp which is a component of the HDD device. An object of the present invention is to provide a gate cut device that can be used.
[0021]
[Means for Solving the Problems]
The gate cut device of the present invention is a device for cutting a gate portion located between a product portion and a runner portion of an injection molded product, and a cutting blade for forming a cut in the gate portion, and a part of the injection molded product Alternatively, it is characterized by comprising ultrasonic application means for applying ultrasonic vibration to the cutting blade and separating the gate portion at the cut portion.
[0022]
By having such a configuration, the thickness of the member to be cut is reduced by forming a cut in the gate portion, and then ultrasonic vibration is applied to a part of the injection-molded product or the cutting blade to perform fusing As a result, stress concentrates on the portion to be cut with a reduced thickness and is quickly melted, so that the generation of burrs in the cutting process of the gate portion can be completely eliminated. In addition, since the cutting position is determined by forming a cut in the gate portion with a cutting blade, the cutting position can be determined at an arbitrary position of the gate portion, and the degree of freedom in designing the gate portion may be reduced. Absent. For this reason, it is possible to avoid the design shape of the gate part that may cause sink marks and unfilled (voids) due to poor flow of the molten resin, and to produce a high quality product part with good dimensional accuracy. Is possible.
[0023]
Thus, after forming a cut with a cutting blade in advance, the outer layer of the molded product is compared with a conventional cutting blade-only cutting method by applying ultrasonic vibration to a part of the injection molded product or cutting the cutting blade. As a result, it is possible to eliminate burrs adhering to the product part and burrs that may drop off. Therefore, for example, if it is carried out in a manufacturing process of a lamp which is a component part of the HDD device, a high quality lamp can be manufactured. Also, by eliminating the occurrence of burrs, the burring process after separating the product part from the molded product that was required in the past is no longer necessary, saving labor and time spent in the burring process. And cost reduction is possible.
[0024]
Furthermore, compared with the conventional ultrasonic fusing method, the cross-sectional area of the portion to be cut by ultrasonic vibration can be reduced, and the tip of the cut can be made into an acute edge shape, so that the fusing is easy and fusing. Can be shortened. Moreover, since the frequency of ultrasonic vibration necessary for fusing can be kept low by forming the cuts, heat generation at the time of fusing is also reduced, deformation of the product part due to melt insulation is reduced, and the product part Quality is also improved.
[0025]
The depth of the cut formed in the gate portion by the cutting blade is desirably the depth immediately before the cutting edge of the cutting blade reaches the region where the gate portion breaks. By setting such a depth, it becomes possible to efficiently melt the final portion of the cutting by ultrasonic vibration. In addition, if the depth is such a depth, the cut portion will not be broken by the weight of the product part, so the ultrasonic vibration is applied to the runner part while the sprue part of the injection molded product is held by a hand or a device. Therefore, there is an advantage that no complicated gripping means is required.
[0026]
Here, if the ultrasonic wave application means is provided with a contact member that detachably holds a part of the injection molded product and transmits ultrasonic vibrations, the ultrasonic wave application unit and the injection molded product are connected and separated. Therefore, the process can be simplified. Further, by grasping a part of the injection molded product, ultrasonic vibration can be reliably transmitted.
[0027]
In this case, it is desirable that the ultrasonic wave applying means applies ultrasonic vibration to the runner portion. In this way, if ultrasonic vibration is applied to the runner portion of the injection molded product, there is no adverse effect such as deformation of the product portion due to the application of ultrasonic waves, so the quality of the product portion is improved. Can do.
[0028]
On the other hand, it is desirable that the cutting blade be a notch formed in the gate portion by a shearing method. In this way, if the notch is formed in the gate portion by the shearing method, the generation of burrs at the notched portion can be suppressed, so that a cut surface with good surface roughness can be obtained.
[0029]
Further, it is desirable that the ultrasonic wave applying means applies an ultrasonic vibration having a frequency of 20 kHz to 40 kHz. By applying the ultrasonic vibration in such a frequency region, a burr is generated at the cut portion of the gate portion. And can be melted quickly. Further, since the amount of heat generated at the time of fusing is reduced due to the relatively low frequency, the deformation of the product part caused by the heat generated at the time of fusing is reduced, and the quality of the product part is improved.
[0030]
When the frequency of ultrasonic vibration is lower than 20 kHz, the time required for fusing separation tends to be longer, and when it is higher than 40 kHz, the amount of heat generated at the time of fusing increases and the deformation of the product part tends to increase. Therefore, the above-described range is preferable.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a plan view showing an automatic molding apparatus provided with a gate cut device according to an embodiment of the present invention, and FIG. 2 is a side view of a press unit constituting the gate cut device shown in FIG. 3 (a) is a cross-sectional view taken along the line AA in FIG. 1, and (b) is an enlarged view of the injection-molded product and the robot hand in (a).
[0032]
As shown in FIG. 1, an automatic molding apparatus 10 includes a press unit 100 that manufactures an injection molded product, a molded product transport unit 200 that transports a molded product molded by the press unit 100, and a product portion of an injection molded product. A gate cutting device 300 for cutting a gate portion between the runner portion, a runner collecting portion 210 for collecting the cut runner portion, a product carrying unit 400 and a product carrying robot 500 for carrying the cut product portion, An inspection unit 600 for inspecting the product portion and a storage unit 700 for storing the product portion in the product tray 701 are provided.
[0033]
As shown in FIGS. 1 and 2, the press unit 100 is provided with an injection device 101, and the molded product transport unit 200 includes a chuck device 202 that holds a molded product molded by the press unit 100, and a chuck device 202. And a robot hand 205 for rotating the.
[0034]
When a chip-shaped molding material (not shown), which is a raw material of the lamp, is put into a material supply device (not shown) using a manual or automated device, it is placed in the cylinder 102 of the injection device 101 shown in FIG. It is kneaded by the provided screw 105 and heated and melted to a predetermined temperature by a heater 103 installed around the cylinder 102. The molten molding material is advanced through the cylinder 102 by the rotation of the screw 105, and then injected into sprue portions, runner portions, and cavities (none of which are shown) provided on the contact surfaces of the molds 104a and 104b. Filled.
[0035]
When the molding material injected at a predetermined pressure between the molds 104a and 104b is cured after a predetermined cooling time has elapsed, the space between the molds 104a and 104b of the press unit 100 is opened, as shown in FIG. Then, the molded product 20 is released (ejected) from the mold 104a. When ejecting the molded product 20, the robot hand 205 at the tip of the molded product conveyance unit 200 shown in FIG. 1 enters between the opened molds 104 a and 104 b, and the runner 40 of the molded product 20 is gripped by the chuck device 202. Then, the horizontal movement and the reverse movement are performed and the movement to the gate cut device 300 is performed.
[0036]
Here, with reference to FIG. 4, the gate cut apparatus 300 and the product conveyance unit 400 are demonstrated. 4A is a side view of the vicinity of the gate cut device 300 and the product transport unit 400, and FIG. 4B is a view of the robot hand 205 viewed from the X direction shown in FIG. 4A.
[0037]
In the product transport unit 400, a product holder 201 for placing the molded product 20 transported by the molded product transport unit 200 is installed on the upper portion thereof, and the product transport unit 400 is rotationally driven by a motor (not shown). The linear rail 402 is slid by the ball screw 401 as a guide mechanism. Further, as shown in FIG. 5, the product holder 201 uses a screw hole 50 of the lamp that is the product portion 30 to position the product portion 30 and guides the product portion 30. The guide part 204 is provided.
[0038]
As will be described later, the gate cutting device 300 shown in FIG. 4A is ultrasonically applied to the runner unit 40 and the cutting device 301 that forms a cut 36 by a cutting blade 305 in a portion to be cut of the gate portion 35 of the molded product 20. And an ultrasonic vibration device 302 that applies vibration.
[0039]
In order to perform a series of operations on the conveyed molded product 20, the cutting device 301 has a structure in which the entire device can be moved up and down by a slide guide 303 and can be raised. In the cutting device 301, a cutting blade bracket 306 including a cutting blade 305 is guided so as to be reciprocally movable by a linear rail 307, and is advanced to the product transport unit 400 side by a cylinder 304. It stops by 308.
[0040]
The ultrasonic vibration device 302 is guided by a guide mechanism (not shown) so as to be movable up and down, and has a structure that can be raised to a predetermined position by a cylinder 309. A contact member 311 is provided so as to face the contact member 310 provided at the tip of the ultrasonic vibrating body 314, and the runner portion 40 of the molded product 20 is detachably held between the contact members 310 and 311. The contact member 311 has a structure that can swing around a fulcrum 312, and the runner portion 40 is sandwiched and released by the contact members 310 and 311 approaching and separating by the operation of the cylinder 313.
[0041]
The molded product 20 gripped by the chuck device 202 shown in FIG. 1 and conveyed by the molded product conveyance unit 200 is gate-cut by a robot hand 205 that reverses 180 degrees using a motor (not shown) as a drive source in the conveyance process. It will be in the state which faced the apparatus 300 side. The molded product conveyance unit 200 horizontally moves the inverted molded product 20 to a position immediately before the gate cut device 300, and stops.
[0042]
After the molded product 20 is stopped, the cylinder 309 of the gate cut device 300 shown in FIG. 4A is operated, and the ultrasonic vibration device 302 is raised. At that time, the stopper bolt 315 comes into contact with the cutting device 301 and the cutting device 301 is also raised in conjunction. Further, the D portion of the ultrasonic vibration device 302 comes into contact with the E portion of the product holder 201 located immediately below the molded product 20 that has been conveyed, and the product holder 201 is raised in conjunction with the ultrasonic vibration device 302. In this embodiment, one cylinder 309 is used as a drive source, and these devices are interlocked. However, a motor or the like can be used as the drive source, and the drive source is provided independently for each device. You can also.
[0043]
As shown in FIGS. 5A and 5B, the raised product holder 201 accommodates the product part 30 of the molded product 20 in the product guide part 204, and positioning pins 203 provided inside the product part 30 include the product part 30. It is positioned by being inserted into the screw hole 50. At this time, a part of the runner portion 40 is positioned by the runner holder 206. The positioning pin 203 and the product guide part 204 have a certain gap with respect to the product part 30, and can prevent welding of the runner part 40 and the product part 30 due to generated heat, which will be described later.
[0044]
Next, as shown in FIG. 6, the cylinder 304 of the cutting device 301 is actuated to advance the cutting blade 305, thereby partially cutting a predetermined position of the gate portion 35 located between the runner portion 40 and the product 30. Thus, after forming the V-groove cut 36, the cylinder 304 operates again in the reverse direction and the cutting blade 305 moves backward.
[0045]
The depth of the notch 36 at this time cannot be determined uniformly because it varies depending on the product shape and the gate size. For example, the remaining dimension of the gate portion 35 where the notch 36 is formed is the same as that of the gate portion 35. It is desirable to set the range to be about 1/4 of the area. If the depth of the notch 36 is within the above-described range, the product part 30 can be kept held by the runner part 40 without falling by its own weight even when the product holder 201 is not present. In the present embodiment, the depth of the cut 36 is set to 0.3 mm with respect to the gate thickness of 0.4 mm, and the remaining dimension after the formation of the cut 36 is set to 0.1 mm.
[0046]
Next, as shown in FIGS. 7 and 8, the contact member 310 provided at the tip of the ultrasonic vibrating body 314 of the ultrasonic vibration device 302 and the contact member 311 face the runner portion 40 of the molded product 20. Grab from the direction to hold. The ultrasonic vibrator 314 to which a voltage is applied by a high-frequency oscillator (not shown) generates an ultrasonic wave by twisting and vibrating the horn at a predetermined frequency and stroke, and this ultrasonic vibration is transmitted to the contact member 310. .
[0047]
When the ultrasonic vibration is applied to the runner portion 40 by the ultrasonic vibration of the contact member 310 and the pressurization of the contact member 311, as shown in FIG. 8, the gate portion 35 positioned at the tip of the runner portion 40 Ultrasonic vibration acts on the thinnest portion, that is, the remaining portion 37 where the cutting 36 is formed by the cutting blade 305, stress concentration occurs, and the material is eventually blown by fatigue failure.
[0048]
Further, by applying ultrasonic vibration to the runner portion 40, frictional heat is generated in the remaining portion 37 of the gate portion 35 simultaneously with the stress concentration described above. As a result, a part of the outer layer (skin layer) of the cut portion of the gate portion 35 is melted, so that no burrs that are about to peel off or burrs that may fall off are generated in the cut portion. In this embodiment, when the frequency of ultrasonic vibration is set to 20 kHz to 40 kHz and the ultrasonic wave application time is set to 0.5 sec to 2.0 sec (optimum 1.0 sec), no burr is generated in the cut portion. It was.
[0049]
Further, in this embodiment, after the cut 36 is formed in the gate portion 35 by the cutting blade 305, the product portion 30 is separated by applying ultrasonic vibration to the runner portion 40. However, the present invention is not limited to this method. Therefore, after the cut 36 is formed by the cutting blade 305, it is also possible to take a method of separating the product part 30 by applying ultrasonic vibration to the cutting blade 305.
[0050]
The contact member 310 and the contact member 311 used in this embodiment are provided with a fluorine coating having a low thermal conductivity in order to suppress the heat generated in the runner portion 40 from being dissipated. The fluorine coating is formed by baking a fluorine-based resin at 250 ° C. to 380 ° C., but has a higher melting point than the synthetic resin material that is a raw material of the molded product 20, and therefore is in contact with the molded product 20. This is suitable without being damaged or peeled off.
[0051]
Next, after the runner unit 40 and the product unit 30 are separated in the gate cut device 300, the runner unit 40 is reversed 270 degrees by the robot hand 205 and collected by the runner collection unit 210 as shown in FIG. 1. . The product unit 30 is transported from the gate cut device 300 to a predetermined position B by the product transport unit 400 while being accommodated in the product holder 201 described above, and then stopped. The product parts 30 stopped at the predetermined position B are gripped one by one by the product transport robot 500 provided in the automatic molding apparatus 10 and transported to the position C immediately before the next inspection unit 600.
[0052]
In the inspection unit 600, an image processing apparatus (not shown) is used in a state where the product transport robot 500 is gripping the product unit 30 to check for abnormalities such as the presence or absence of foreign matter, measurement of specified dimensions, and the like according to predetermined items. The product part 30 is inspected. The measurement items and inspection items in the inspection unit 600 are not limited to these, and it is possible to set desired inspection items by setting a program for the image processing apparatus.
[0053]
The product unit 30 determined to be non-defective by the inspection in the inspection unit 600 is again transported by the product transport robot 500 and stored in the product tray 701 of the storage unit 700. The product part 30 determined to be defective is collected into a collection box (not shown).
[0054]
In the embodiment described above, the automated automatic forming apparatus 10 has been described. However, gate cutting using a manual cutting jig is also possible. For example, with the runner part 40 still attached to the molded product 20 after molding, a cut is formed in the gate part 35 between the runner part 40 and the product part 30 using a not-shown cutting jig, Hold the sprue part and remove it manually. The product part 30 continuous with the runner part 40 is in a state of being held by the runner part 40 to such an extent that the product part 30 does not fall by its own weight, and can be taken out integrally.
[0055]
And receiving means, such as a tray, are previously installed under the product part 30, and the runner part 40 is clamped with a contact member using the hand press-shaped ultrasonic vibration provision apparatus. Thereafter, similarly to the above-described embodiment, the gate portion 35 can be cut by applying ultrasonic vibration to the runner portion 40 by the ultrasonic vibration applying device. As described above, the cutting operation using the manual cutting jig and the ultrasonic vibration applying device can reduce the cost when the production quantity is small.
[0056]
The above-described embodiment is an exemplification, and the present invention is not limited to this embodiment. Therefore, the present invention can be widely used in the manufacturing process of other molded products, and departs from the gist of the present invention. It is also possible to carry out the modification within the range not to be performed.
[0057]
【The invention's effect】
The present invention has the following effects.
[0058]
(1) In an apparatus for cutting a gate portion located between a product portion and a runner portion of an injection molded product, a cutting blade for forming a cut in the gate portion, and a gate for applying ultrasonic vibration to a part of the injection molded product By providing ultrasonic application means for separating the part at the cut part, it is possible to completely eliminate the occurrence of burrs in the cutting process of the gate part without reducing the degree of freedom in designing the gate part. Quality can be improved. Further, labor and time spent in the burr processing step can be saved.
[0059]
(2) If the ultrasonic wave applying means is provided with a contact member that detachably holds a part of the injection molded product and transmits ultrasonic vibrations, the ultrasonic wave applying means and the injection molded product are connected and separated. Therefore, the process can be simplified. Further, by grasping a part of the injection molded product, ultrasonic vibration can be reliably transmitted.
[0060]
(3) Since the ultrasonic wave application means applies ultrasonic vibrations to the runner part, there is no adverse effect such as deformation of the product part due to the application of ultrasonic waves, so that the quality of the product part is improved. Can do.
[0061]
(4) Since the cutting blade forms a cut in the gate portion by a shearing method, the generation of burrs at the cut portion can be suppressed, so that a cut surface with good surface roughness can be obtained.
[0062]
(5) When the ultrasonic wave applying means applies ultrasonic vibration having a frequency of 20 kHz to 40 kHz, the cut portion of the gate portion can be quickly blown out without generating burrs.
[Brief description of the drawings]
FIG. 1 is a plan view showing an automatic molding apparatus provided with a gate cut device according to an embodiment of the present invention.
FIG. 2 is a side view of a press unit constituting the automatic molding apparatus shown in FIG.
3A is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3B is an enlarged view of a molded product and a robot hand in FIG.
4A is a side view of the vicinity of the gate cutting device shown in FIG. 1, and FIG. 4B is a view showing a molded product held by a robot hand.
5A is a plan view of the vicinity of the product holder shown in FIG. 4, and FIG. 5B is a cross-sectional view taken along line FF in FIG. 5A.
FIG. 6 is an explanatory view showing a cut forming process by a gate cut device.
FIG. 7 is an explanatory view showing a cut forming process by a gate cut device.
8 is a cross-sectional view taken along line GG in FIG.
FIGS. 9A and 9B are explanatory views showing a cutting process using a conventional gate cut device, and FIG. 9C is a cross-sectional view taken along the line HH in FIG. 9B.
[Explanation of symbols]
10 Automatic molding equipment
20 Molded products
30 Product Department
35 Gate part
36 notches
37 remainder
40 runner club
50 Screw hole
100 press unit
101 Injection device
102 cylinders
103 heater
104a, 104b Mold
105 screw
200 Molded product transport unit
201 Product holder
202 chuck device
203 Positioning pin
204 Product guide
205 Robot hand
206 runner holder
210 Runner recovery department
300 Gate cut unit
301 cutting device
302 Ultrasonic vibration device
303 Slide guide
304 cylinders
305 Cutting blade
306 Cutting blade bracket
307 linear rail
308 Advance stopper
309 cylinder
310, 311 contact member
312 fulcrum
313 cylinder
314 Ultrasonic vibrator
315 Stopper bolt
400 Product transport unit
401 Ball screw
402 linear rail
500 Product transfer robot
600 inspection units
700 storage unit
701 Product tray

Claims (5)

An apparatus for cutting a gate portion located between a product portion and a runner portion of an injection-molded product, wherein a cutting blade that forms a cut in the gate portion and a part of the injection-molded product or the cutting blade A gate cut device comprising: an ultrasonic wave applying means for applying a sound wave vibration to separate the gate portion at the cut portion. 2. The gate cut device according to claim 1, wherein the ultrasonic wave applying means is provided with a contact member that detachably holds a part of the injection molded product and transmits ultrasonic vibrations. The gate cut device according to claim 1 or 2, wherein the ultrasonic wave applying means applies ultrasonic vibration to the runner portion. The gate cutting device according to claim 1, wherein the cutting blade forms a cut in the gate portion by a shearing method. The gate cut device according to any one of claims 1 to 4, wherein the ultrasonic wave applying means applies ultrasonic vibration having a frequency of 20 kHz to 40 kHz.

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