JPH1086191A - Mold and molding piece for injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of flashes without incurring flaws in a molding piece and increasing costs by performing NK plating on the front and rear surfaces of a thin plate molding piece main body, and allowing the front and rear surfaces to be different from each other in the thickness of the KN plating layer. SOLUTION: The molding piece 4 has a molding surface comprising a plurality of fine grooves on its upper portion. The molding piece 4 is given KN plating on the front and rear surfaces employing phosphor bronze, iron, and aluminum as a base material to then be controlled in the plating thickness. At this time, an interrelation between the plating thickness (t) of the surface side to be in contact with resin and the plating thickness (V) of the surface in another side is made for finish and incorporation in inequalities of base material : phosphor bronze, aluminum t<=V, and base material : iron t>=V, thereby preventing warpage and flashes from occurring. Or, since the molding piece is pushed out toward the molding piece 6 side, the occurrence of flashes can be precluded likewise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold and a molding piece for transferring the shape of a molded product.

[0002]

2. Description of the Related Art In recent years, as a method of manufacturing a molding piece of a metal mold for injection molding of a finely shaped product or an optical component, copper, iron, aluminum or an alloy thereof is used as a base material, and the surface thereof is subjected to KN plating. After that, a method of performing thickness adjustment processing and shape processing with a diamond bite and, if necessary, performing grinding is becoming common. For example, as shown in FIG. 1 and FIG. 2 which is an enlarged view thereof, a thin plate-shaped molding piece is manufactured and incorporated by the above-described method in an injection molding die having a molding surface for transferring a product shape to an upper surface 11b and a left surface 11a. As a result, a gap was formed between the molding pieces 4 and 6 as shown in FIG. This gap is generated by warpage of the molding piece 4. As a countermeasure for this, conventionally, as shown in FIG. 13 or FIG. 14, the forming piece 4 is bent in a direction to eliminate the gap by bending or machining, and then is incorporated into a mold to suppress the gap.

[0003]

However, the above-mentioned conventional method has the following problems. (1) The molding surface may be damaged in the step of warping the molding piece 4. (2) It is difficult to give the molding piece 4 a stable warpage. (3) Cracks may enter the plating layer in the vicinity of the warp and become unusable. (4) If warpage is produced by machining, the cost increases.

[0004] Here, as a result of the inventor of the present application diligently examining the causes of the above-mentioned gaps, the following has been found. (1) There was no gap at room temperature, but a gap occurs when heated to the mold temperature (160 ° C.) during molding. (2) When this gap exceeds 2 μm, burrs are generated.

[0005] This phenomenon is based on the principle that the molding piece 4 exhibits bimetal-like properties depending on the physical property value and thickness of the KN plating and the base material, and warpage occurs in accordance with a change in temperature. found.

[0006] In addition, the injection molding die has the following problems.

The dimension for determining the shape of the product is determined by the amount of protrusion or retraction of the molding piece relative to the mold body,
Moreover, when the dimensional tolerance is very tight, for example, as shown in FIG.
In the partial enlarged view of FIG. 1 shown in FIG. 7, when the positional relationship between the molding piece 503 and the mold main bodies 504, 505, that is, the tolerance of the dimension indicated by f is about ± 2 μm, in order to obtain this dimensional accuracy, It was taking such a method. (1) In the example shown in FIG. 37, the dimension indicated by h of the molding piece 503 is processed with high accuracy, and is fixed to the template 502 so as to be adjustable using screws. (2) In the example shown in FIG. 38 and FIG. 39, the dimension indicated by h of the molding piece 503 is processed with high precision, and the thickness t of the collar of the piece is processed by actual matching.

In any case, after assembling the mold, molding is performed experimentally, the dimensions of the molded product are measured, the correction amount is calculated, the position of the molding piece 503 is corrected, and the confirmation molding is performed. What he did was repeat.

However, such a method has the following problems. (1) When a molded product with defective dimensions is produced, the mold is removed from the injection molding apparatus, disassembled, re-assembled, reassembled, and confirmed. It takes a lot of time and eventually increases the cost of the product. (2) Since the correction amount is on the order of microns, it takes a long time to set the pieces on the processing machine at the time of the correction processing, which also increases the cost.

Conventionally, an ink jet head for performing recording by discharging ink has been composed of a single resin excellent in mechanical strength, dimensional stability, and ink resistance. For example, a polyurethane resin, a polyimide resin, a melamine resin, a liquid crystal polymer and the like are desirable, and a resin such as polysulfone and polyethersulfone is particularly desirable from the viewpoint of injection moldability and ink resistance. 2. Description of the Related Art In recent years, in an inkjet head capable of obtaining a high-quality image stably at a high speed, the head size has been increased, and it has become impossible to satisfy dimensional accuracy with a resin alone. for that reason,
Increasingly, it is composed of a composite of a resin and an insert member obtained by insert-molding a member such as a metal.

Usually, as a method for obtaining a composite of a resin and an insert member, the insert member is held in a fixed mold or a movable mold, and the fixed mold and the movable mold are clamped. After the cavity is formed, a method of injecting a molten resin into the cavity, keeping the pressure, cooling, and taking out the resin is adopted. In particular, when a pipe-shaped rod is used as an insert member, the method of positioning the insert member on the movable side mold, driving the slide with an angular pin or the like utilizing the movement of the mold clamping operation, and gripping the insert member has conventionally been used. Has been done more.

However, in this conventional example, positioning is performed by engaging the first concave portion or convex portion of the insert member with the corresponding second convex portion or concave portion of the mold, and then performing the positioning of the injection molding machine. The slide is driven by an angular pin or the like utilizing the movement of the mold clamping operation, and the fourth concave portion or convex portion on the slide side is fitted into the third convex portion or concave portion at both ends of the insert member to hold the insert member. I am trying to do it. Therefore, the insert member is in the temporary holding state until the third protrusions or recesses at both ends of the insert member and the fourth recesses or protrusions on the slide side are fitted, and the vibration at the time of mold clamping and the initial stage of driving are performed. There has been a problem that the insert member may fall from a predetermined position due to an impact, and if the insert member is caught between the molds, the mold may be damaged. In addition, the mold clamping speed needs to be extremely low in order to suppress vibrations during mold clamping, so that there is a problem that the molding cycle is lengthened and the quality of the molded product is significantly reduced.

Further, as described above, the ink jet head, which is becoming longer in recent years, has a thin plate-shaped orifice plate portion 109 as shown in FIG. 27, and a portion of the orifice plate which is in contact with the ink flow path portion. Has a thinner portion 109a which is made thinner. Particularly in a mold for molding a molded article having a long shape and a thin portion in the longitudinal direction, when the molten resin is injected and filled in the cavity,
2. Description of the Related Art Conventionally, a method of providing a gate at a position opposed to a thin portion of a molded product and setting the gate width to 10 to 20 mm to obtain a molded product has been conventionally performed.

However, in such a conventional technique,
There were the following problems.

When the molten resin is injected and filled into the cavity of the molded product having a thin shape in the longitudinal direction, the molten resin injected from the gate flows while spreading to the thick-walled portion of the molded product in the longitudinal direction, and is further increased by the injection pressure. The molded product flows from both ends of the thick portion to the thin portion on the side facing the gate. At this time, since the gate width facing the conventional thin portion in the longitudinal direction was short, the molten resin flowing from both ends of the thick portion of the molded product to the thin portion was used to mold the narrow thin portion in the longitudinal direction of the resin flow path into a mold. Since molding is performed while being cooled inside, the flow resistance increases during filling and it hardens, causing injection pressure and
Even if the mold temperature, resin temperature, etc. are set in a direction to improve the flowability of the molten resin, the molten resin flowing to the thin-walled portion does not join in the longitudinal direction, and the center of the thin-walled portion has poor filling. This raises the problem that the quality of the molded product cannot be satisfied.

Furthermore, the gate portion of the molded product is cut by a cutting machine in post-processing after molding. At this time, since a resin material of a relatively low brittleness and a hard material is used, the cutter is not used. There is also a problem that the durability of the blade is low, the contact of the cutter of the cutting machine is immediately deteriorated, the cut position is not stable, and the cut cross section has irregularities, which makes the product unusable.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an injection molding die capable of preventing the occurrence of burrs without causing damage to a molding piece or an increase in cost. And a molded piece thereof.

Another object of the present invention is to provide an injection mold capable of easily adjusting the amount of protrusion or retraction of a molding piece with respect to a mold body and reducing the cost of a molded product. It is.

Still another object of the present invention is to provide an injection molding die capable of reliably holding an insert member.

Still another object of the present invention is to provide an injection molding die capable of reliably distributing a resin to a thin portion even in a molded product having a long thin portion.

Still another object of the present invention is to provide an injection molding die capable of easily cutting a gate portion of a molded product.

[0022]

In order to solve the above-mentioned problems and achieve the object, a molding piece of an injection molding die according to the present invention is formed by applying KN plating to the front and back surfaces of a thin plate-like molding piece main body. It is characterized in that the thicknesses of the KN plating layers on the front and back are made different.

Further, in the molding piece of the injection mold according to the present invention, the plating thickness of the front and back surfaces is set from the physical property values of the molding piece body and the plating material and the thickness of the molding piece body. Features.

In the molding piece of the injection mold according to the present invention, one of the front and back plating layers is processed to a predetermined thickness, the plating thickness is measured, and the other surface is measured. It is characterized by being processed to a predetermined thickness.

In the molding piece of the injection molding die according to the present invention, the plating thickness is measured by chamfering a portion not involved in the molding of the molding piece and measuring the plating thickness of the exposed portion. It is characterized by that.

In the molding piece of an injection molding die according to the present invention, the plating thickness is measured by cutting an end face portion not involved in molding of the molding piece over the entire surface in the thickness direction, and measuring an exposed portion of the end portion. It is characterized by performing plating by measuring the plating thickness.

Further, in the molding piece of the injection molding die according to the present invention, the thickness of the plating layers on the front and back is such that when the body of the molding piece is heated, the molding piece is moved in a predetermined direction by a bimetal effect. It is characterized by being set to warp.

In the molding piece of the injection mold according to the present invention, the predetermined direction is a direction in which the molding piece body comes into close contact with another mold component constituting the mold. It is characterized by having.

Further, the injection mold according to the present invention comprises:
By using KN plating on the front and back surfaces of the thin plate-shaped molding piece main body and using different thicknesses of the KN plating layers on the front and back surfaces, the molding piece caused by warpage of the molding piece due to a change in mold temperature can be used. It is characterized in that the gap with the surrounding mold member has been offset.

Further, in the injection molding die according to the present invention, the plating thickness of the front and back surfaces is set from the physical property values of the molding piece body and the plating material and the thickness of the molding piece body. .

In the injection molding die according to the present invention, the molding piece measures one plating surface of the front and back plating layers to a predetermined thickness, and then measures the plating thickness.
It is characterized in that the other surface is processed to a predetermined thickness.

In the injection mold according to the present invention, the plating thickness of the molding piece was measured by chamfering a portion not involved in the molding of the molding piece and measuring the plating thickness of the exposed portion. It is characterized by:

In the injection molding die according to the present invention, the plating thickness of the molding piece is measured by cutting an end surface portion not involved in molding of the molding piece over the entire thickness direction and plating the exposed portion. It is characterized in that it was performed by measuring the thickness.

In the injection molding die according to the present invention, the thickness of the plating layers on the front and back of the molding piece is such that when the molding piece body is heated to the temperature at the time of molding, the molding piece is caused by a bimetal effect. , Are set so as to warp in a predetermined direction.

In the injection molding die according to the present invention, the predetermined direction is a direction in which the molding piece main body comes into close contact with another die constituting member constituting the die. Features.

Further, the injection mold according to the present invention comprises:
A mold body, a molding piece mounted on the mold body, fine movement means for finely moving the molding piece with respect to the mold body, and measuring a relative position of the molding piece with respect to the mold body. And a measuring means.

In the injection molding die according to the present invention, the fine movement means is mounted on the molding piece, and the fine movement means is inclined by a predetermined angle with respect to a first direction which is a moving direction of the molding piece. A holding member having a second slope inclined in the second direction substantially perpendicular to the first direction by the predetermined angle, and having a second slope contacting the first slope; And a feed mechanism for moving the feed mechanism in the second direction.

Further, in the injection mold according to the present invention, the predetermined angle is not more than 25 °.

Further, in the injection mold according to the present invention, the feed mechanism is a feed mechanism using a feed screw.

Further, the injection molding die according to the present invention is characterized in that the injection molding die is further provided with recovery means for recovering the operation when the fine movement means becomes inoperative.

In the injection mold according to the present invention, the recovery means includes a tap hole formed in the holding member and / or the slide member, and a rod screwed into the tap hole. It is characterized by that.

Further, the method for positioning a molding piece according to the present invention is a method of positioning a molding piece for performing positioning of the molding piece with respect to the mold body by slightly moving the molding piece with respect to the mold body. A holding member having a first inclined surface which is attached to the molding piece and is inclined at a predetermined angle with respect to a first direction which is a moving direction of the molding piece, and a holding member having a second direction substantially orthogonal to the first direction; Contacting a slide member having a second slope contacting the first slope with a predetermined angle, and moving the slide member in the second direction so that the first slope and the second slope are moved.
And the step of finely moving the molding piece in the first direction by sliding on the slope.

Further, the injection molding die according to the present invention comprises:
An injection molding die for insert-molding a long insert member inside a long molded body, comprising: a mold body; and both end portions of the insert member which are arranged so as to be able to enter and exit the mold body. And a drive means for driving the support member in and out of the mold body.

Further, in the injection molding die according to the present invention, the driving means is constituted by a fluid pressure cylinder.

Further, in the injection molding die according to the present invention, the driving means is constituted by a servomotor.

Further, the injection mold according to the present invention comprises:
An injection molding mold for molding a long molded body by injection molding, comprising a long cavity formed in the mold, and a gate for injecting a resin material into the cavity. And a gate provided long along the longitudinal direction of the cavity.

Further, in the injection molding die according to the present invention, a V-shaped groove extending along the longitudinal direction is formed in the gate portion at a position near the gate portion of the molded body. It is characterized in that a projection is formed.

[0048]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. (First Embodiment) The first embodiment will be described below. Before that, the outline of the present embodiment will be described first.

It is generally known that a bimetal formed by bonding two plates having different coefficients of linear expansion bends due to a change in temperature. In the present embodiment, by applying this bimetal phenomenon, by changing the plating thickness and the base material with respect to the surface in contact with the resin, at the temperature at the time of molding, no gap occurs between the molding piece and the surrounding mold member. It warps in the direction.

When thin pieces of copper, iron, aluminum and their alloys are used as a base material and a piece whose thickness has been adjusted after KN plating is incorporated into an injection molding mold and molded, the piece warps, causing burrs. May be. This is because the bimetal phenomenon occurs due to the relationship between the thickness of the base material and the KN plating, the coefficient of linear expansion, the coefficient of longitudinal elasticity, and the Poisson's ratio. The results of the study in this embodiment will be described below.

FIG. 3 is a view showing a state in which the formed piece 4 obtained by applying the KN plating 4d to the base material 4c and adjusting the thickness is sandwiched between the formed pieces 3 and 6 from the left and right.

Here, the forming piece 4 uses two kinds of phosphor bronze and iron as the base material 4c, adjusts the plating thickness after KN plating, and adjusts the plating thickness t on the side in contact with the resin to 0.09.
mm and 0.06 mm. The adjustment of the plating thickness is performed by vacuum-adhering the molding piece 4 to a jig and using a diamond. At this time, whether the plating thickness is processed as specified does not affect the molding of the molding piece 4. The part is chamfered for measurement to expose the base material and check the thickness. The warpage of the upper right end portion 42 of the formed piece 4 thus processed was 0 μm at room temperature (25 ° C.) based on the upper left end portion 61 of the formed piece 6. FIGS. 4 and 5 show experimental results and calculated results of the warpage S when this was raised to the mold temperature (160 ° C.) during resin molding. The base material thickness is 0.3 mm, the finished thickness is 0.44 mm, the projecting amount of the forming piece 4 from the forming pieces 3 and 6 is 3 mm, and + and-of the amount of warpage represent directions.

According to FIG. 5, it is understood that the experimental results and the calculation results when phosphor bronze is used as the base material are substantially the same.

Next, FIG. 6 is a view showing the injection mold of the present embodiment cut into four parts. Center sprue 10
Numeral 3 is provided so as to be continuous with runners 12 divided in four directions for a multi-cavity mold configuration, and shows a state of a cavity 11 communicating with one of the runners 12 among them. .

FIG. 1 is a detailed sectional view of a main part around the cavity 11 of FIG. Cavity 1 through sprue 103
1. Inject molten resin into 1 and wait for the resin to harden.
The mold is opened and the molded product is taken out. The injection mold according to the present embodiment is for molding a molded product having a plurality of fine groove shapes.
Has a molding surface composed of a plurality of fine groove-shaped portions at the upper part as shown in FIGS. 8 and 9.

When the forming piece 4 is subjected to KN plating on the front and back surfaces using phosphor bronze, iron, and aluminum as base materials to adjust the plating thickness, the plating thickness t on the surface side in contact with the resin based on the results of FIG. Base metal: phosphor bronze, aluminum t ≦ v Base material: iron t ≧ v, and the relationship between the plating thickness v on the opposite side can be prevented to prevent warpage and burrs. Alternatively, since the molding piece 4 is pressed against the molding piece 6 while being warped to the opposite side to the resin side, the occurrence of burrs can be similarly prevented (see FIG. 7).

The measurement of the plating thickness dimension is shown in FIG.
As shown in (b), a chamfering process 45 for exposing the base material is performed on the bottom surface of the molding piece which does not hinder the shape of the molded product, and the plating thickness can be measured to obtain a predetermined numerical value.

When the base material of the molding piece 4 is iron, the plating thickness v on the surface opposite to the side in contact with the resin may be 0 μm, that is, the base material may be exposed.

When the base material is phosphor bronze or aluminum,
T to prevent corrosion due to resin gas generated during molding
Has a minimum thickness of 0.005 mm.

Further, as shown in FIGS. 11 (a), 11 (b) and 11 (c), the plate thickness of the molding piece 4 may not be uniform.

Further, the processing part for measuring the plating thickness is shown in FIG.
2 (a), (b) and (c) as shown in the bottom and side views. (Second Embodiment) FIG. 15 is a perspective view showing a shape of a molded product formed by an injection mold according to a second embodiment.

The molded product shown in FIG. 15 is a so-called grooved top plate 102 which constitutes an ink jet head for performing recording by discharging ink, in which a large number of nozzles (grooves) 104 for discharging ink are formed. When combined with a heater board on which a large number of heaters for heating ink corresponding to the positions of the nozzles 104 are arranged, they function as an inkjet head.

In FIG. 15, the grooved top plate 102 is a full line type having a large number of discharge nozzles and long in the X direction. An upper surface 107 of the main body 106 of the grooved top plate 102 is formed with a concave portion 108 which is long in the X direction. The concave portion 108 and a heater board (not shown) mounted on the upper surface 107 of the main body 106 allow ink liquid to flow. Room 110
Is formed. At the center of the main body 106, for example, a metal insert member 112 extending in the X direction is arranged. The insert member 112 is formed in a pipe shape, and the inside thereof serves as an ink supply passage. Main unit 1
The ink supplied from the opening 114 of the ink passage 106 passes through the inside of the insert member 112 and passes through an ink supply hole 116 formed on the upper surface of the insert member 112.
Supplied to The ink supplied to the ink liquid chamber 110 is heated and boiled by the heater corresponding to each nozzle 104, and the ink formed on the end face of each nozzle 104 as shown in FIG. It is discharged from the outlet 118.

FIG. 17 is a sectional view showing a structure in which a mold for forming and processing the above-mentioned grooved top plate is divided into four parts. In FIG. 17, the X axis shown in FIG. 15 is set in a direction perpendicular to the plane of the paper, and the diagram shown in FIG.
FIG. 13 corresponds to a cross-sectional view of FIG.

In FIG. 17, the center spool 121 is provided so as to be continuous with runners 122 separated in four directions because of a multi-cavity mold configuration. FIG. 17 shows the cavity 12 communicating with one of its runners 122.
3 is shown.

FIG. 18 is a sectional view of a main part around the cavity 123 of FIG. The molten resin is injected into the cavity 123 through the spool 121, the hardening of the resin material is awaited, the mold is opened from the separation plane PL, and the molded product is taken out. In this mold for injection molding, the distance between the upper surface 107 of the main body 106 of the grooved top plate 102 and the upper surface of the nozzle 104 in FIG. 15, that is, FIG. 19 which is an enlarged view of a portion C in FIG. Dimensional accuracy is important, ± 2
Accuracy of about μm is required. Since the error of the height of the groove of the piece 133 is about ± 0.5 μm as shown in FIG. 20, the protrusion of the piece 133 with respect to the piece 134 in the mold of the present embodiment accordingly. ± 1.5
A mechanism for adjusting the error within about μm is provided.

Hereinafter, an adjusting mechanism for adjusting the projecting amount of the piece 133 will be described.

In FIG. 18, on the end surfaces of the inclined pieces 131 and 132, smooth inclined surfaces 131a and 132a inclined by an angle θ with respect to the horizontal plane are formed. Inclined piece 1
31 is biased rightward in the figure by a compression spring 139, and is opposed to this spring force by a minute feed mechanism 137 using a feed screw (in this embodiment, for example, using a micrometer). By moving 131 to the left in the figure, the inclined pieces 13
2 is pushed down. In order to push up the inclined piece 132 in a state where the inclined piece 132 and the piece 133 are engaged with the molds 161 and 162, which have been machined with high accuracy, so that the inclined surface moves favorably by the flange portion 133a. Assembled with the compression spring 140. At this time, the inclined piece 132 may be configured to be divided.

As described above, the inclined piece 131 is assembled together with the compression spring 139 while being pressed against the end face of the spindle 137a of the micro feed mechanism 137 equipped with a clamp, and the mold 161 is fixed to the mold 162 in this state. I do. In this embodiment, a micrometer is used as the minute feed mechanism 137. However, the present invention is not limited to this, and any other mechanism having a feed mechanism and a unit for measuring the moving distance of the inclined piece 131 may be used. It may be something.

The tilt piece 131 thus assembled is advanced with high precision by rotating the minute feed mechanism 137 in one direction, and is retracted by the urging force of the compression spring 139 by rotating it in the opposite direction. This movement is to move the inclined piece 132 up and down according to the inclination angle θ. For example,
Assuming that the inclination angle θ is 2 °, when the spindle 137a of the minute feed mechanism 137 is advanced by 0.05 mm, tan2 ° ×
As a result, the piece 133 that determines the product shape can be positioned with high accuracy in the vertical direction. The inclination angle θ is desirably 25 ° or less in consideration of smooth operation. After positioning the piece 133a at a predetermined position in this way, the minute feed mechanism 137 is fixed with a clamp (not shown), and the screw 142 is tightened. By tightening the screw 142, the wedge piece 13
The piece 134 moves to the left by the wedge action of No. 6, and the piece 133 is sandwiched between the piece 135 and the piece 135 and fixed. In addition, piece 1
34 and 135 are fixed to separate members by flanges 134a and 135a so as not to fall off even when the wedge piece 136 is removed. Thus, the work of adjusting the position of the piece 133 is completed.

In this embodiment, the following processing is performed in order to prevent a malfunction and recover from the malfunction when the malfunction occurs. (1) The inclined pieces 131 and 132 are formed of a material which is equal to or smaller than the linear expansion coefficient of the mold 162. (2) Fluorine or silicon-based grease that can withstand the molding temperature is applied to the movable part including the minute feed mechanism 137. (3) Spindle 1 of fine feed mechanism on inclined piece 131
At the position deviated from the position where 37a contacts, the tapped hole 1
31b are formed. Also, the set screw 141 is
It is used when the inclined piece 132 has malfunctioned.

The above configuration (3) is composed of the inclined pieces 131,
Used when 132 malfunctions. The following describes a recovery method in the event of a malfunction.

If the tilt piece 131 malfunctions, first, the spindle 137a of the fine feed mechanism 137 is moved rightward, and the shaft 143 is screwed into the tap hole 131b formed in the tilt piece 131 as shown in FIG. The bite of the inclined piece 131 is recovered by pulling it toward the near side in the drawing. In addition, when the tilt piece 132 malfunctions, the tilt piece 131 is moved to the right by the fine feed mechanism 137 to provide a space movable above the tilt piece 132 as shown in FIG. By screwing the set screw 141, the bite of the inclined piece 132 is recovered. Note that the set screw 141 may be pressed against the inclined piece 132 during normal forming.

FIG. 23 shows a first modification, in which the angle between the inclined pieces 131 and 132 is set to an angle other than 90 °. Thus, the inclined pieces 131,
The angle formed by 132 is not limited to 90 °.

FIG. 24 shows a second modification, which differs from the second embodiment in that the inclined pieces 131, 1
32 in which the direction of the inclination angle θ is changed. Even in this case, the same operation as in the second embodiment can be obtained.

FIGS. 25 and 26 show the third and fourth embodiments.
This is a modification of the second embodiment, which is different from the second embodiment in the method of engaging the piece 133 and the inclined piece 132. In FIG. 25, the through hole 133a is provided in the piece 133, and the protrusion of the inclined piece 132 is inserted into this through hole. Also, in FIG. 26, a screw hole is provided in the piece 133, and the piece 133 is fixed with the bolt 170 from the inclined piece 132 side. Even with such a structure, the same operation as that of the second embodiment can be obtained.

Next, FIG. 27 is a side view of the grooved top plate 102 formed by the mold of this embodiment, that is, FIG.
It is the figure seen from the direction. In FIGS. 15 and 27, the grooved top plate 102 has thin portions 1 above and below a main body portion 106 thereof.
09, 111, and the thin portion 109 has a thinner portion 109a at the base thereof. This thin portion 109a extends long in the longitudinal direction of the grooved top plate 102 as shown in FIG. 28 as viewed in the direction of arrow E in FIG. Therefore, when molding the thin portions 109 and 111, the resin may not be sufficiently distributed, which has been a conventional problem. This embodiment solves this problem.

FIG. 29 is a view showing the shape of the gate portion formed by the mold apparatus of this embodiment. In FIG. 29, the width of the gate portion 202 (the portion formed by the gate 124 in FIG. 17) is changed to the width of the thin portion 109a in order to improve the resin filling property in the thin portion 109a in the longitudinal direction of the grooved top plate 102. The gate structure has a gate structure in which the gate width is increased and the runner portion 204 parallel to the gate width is also increased.

Thus, the cavity on the fixed side and the movable side is clamped to form a cavity, and when the molten resin is injected and filled in the cavity, the resin is filled into the thin portion 109a in the longitudinal direction facing the gate. Time hastened. Thus, the molten resin flowing from both ends of the thick-walled portion of the grooved top plate 102 to the thin-walled portion can be joined without being solidified during filling, and the thin-walled portion 109a can be formed.

In the post-process after molding, it is necessary to cut the grooved top plate 102 from the gate 202 by a cutting machine as shown in FIGS. 31 and 32. The cutting machine shown in FIG. 31 supports a cutting blade 214 via a slide shaft 212 in a vertically movable manner with respect to the cutting machine main body 210, and manually moves a lever 216 provided on a side surface of the cutting machine main body 210. The cutting blade 214 is moved down to separate the gate section 202 from the grooved top plate 102. Further, the cutting machine shown in FIG. 32 has a cutting blade 214 supported by a fluid pressure cylinder 220 so as to be able to move up and down. The plate 102 is cut off.

In the present embodiment, in order to improve this cutting property, a V-shaped notch 205 in side view as shown in FIGS. 29 and 30 is provided near the connection between the gate 202 and the grooved top plate 102. Provided.

When this is actually cut, the grooved top plate 102 is positioned with respect to a cutting machine as shown in FIGS. 31 and 32 so that the tip of the cutting blade 214 comes into contact with the concave portion of the cutout 205. And fix the cutting blade 21 in the notch 205.
Make sure that 4 hits stably. Thereby, the cutting blade 2
Since 14 cuts the thin portion of the cutout 205, the cutability is improved, the cut cross section is straightened, and the amount of protrusion of the cut mark from the grooved top plate is reduced. In addition, since the cutting property is improved, the cutting blade 214
Also improves durability.

Next, in the present embodiment, as shown in FIG. 15, a pipe-shaped insert member 112 for maintaining the shape in the longitudinal direction is insert-molded on the grooved top plate 102. A configuration for holding the insert member 112 with respect to the mold will be described below.

FIG. 33 is a view showing the state of the mold before the installation of the insert member.

First, with the fixed-side mold 162 and the movable-side mold 164 opened, the protruding pins 301 disposed on the movable-side mold 164 are made to project, and the insert member 112 shown in FIG. Into the hole 117 formed in the hole. By this fitting, the insert member 112 is temporarily held in the mold 164 on the movable side. Thus, the insert member 11
When the ejecting pin 301 is returned to the movable mold 164 side by the ejector plate 302 in a state in which the insert member 112 is temporarily held, the insert member 112 is positioned at a substantially specified position. The protruding pin 301 also has a function of protruding and releasing the molded top plate 102 with the groove.

FIG. 34 is a view showing a state where the insert member 112 is fixed at a prescribed position.

When the protruding pin 301 is retracted and the insert member 112 is positioned at a substantially specified position, the fluid pressure cylinder 303 is driven to insert the rods 304 of the cylinder into the holes at both ends of the insert member 112. Then, the insert member 112 is fixed. At the tip of the rod 304, a step 304a is provided.
4a are fitted into the holes at both ends of the insert member 112, and the shoulder of the step 304a is
And the insert member 112 is held in contact with the end surface of the insert member 112.

As the timing for driving the fluid pressure cylinder 303, a signal in which the protruding pin 301 is retracted to the original position is used as a driving start signal of the cylinder 303.

When the insert member is held, the movable mold 164 is moved and clamped. Next, inject the molten resin, open the mold again after the pressure-holding and cooling process,
The fluid pressure cylinder 303 is operated to retract the rod 304 from the molded product. Then, the formed grooved top plate 10
2 is ejected by the ejection pin 301 and taken out.

In the above embodiment, the rod 304
Although the drive source for driving the motor has been described as a fluid pressure cylinder, the drive source is not limited to this, and a servo motor or the like may be used.

Next, FIG. 36 is a diagram showing an ink-jet apparatus having an ink-jet head in which a grooved top plate 102 formed by a mold of this embodiment and a heater board having a heater corresponding to each groove are combined. is there.

FIG. 36 is a schematic diagram showing a so-called full-line type ink jet head 400 having a width corresponding to the recording width of a recording medium and a recording apparatus equipped with the ink jet head 400.

In FIG. 36, the ink jet head 4
Ink is ejected from 00 toward a recording medium 404 such as paper or cloth conveyed by a recording medium conveying roller 402,
This makes a record.

In the case of the ink jet head obtained in the above embodiment, even if the ink jet head is a long ink jet head such as a full line head, the recording quality is not deteriorated, so that a high quality recorded matter can be obtained. In this case, it is more effective if the length of the ink jet head 400 in the heater row direction is 30 mm or more.
It is particularly effective when the thickness exceeds mm.

The ink-jet head obtained in the above-described embodiment is a means for generating thermal energy (eg, an electrothermal converter or a laser beam) as an energy used for performing ink ejection, particularly in an ink-jet recording system. Etc.), and a liquid ejecting head of a type in which a state change of ink is caused by the thermal energy,
This provides an excellent effect in the recording apparatus. According to such a method, it is possible to achieve higher density and higher definition of recording.

As described above, according to the above embodiment, the following effects can be obtained. (1) The tilt piece 131 is moved by a minute feed mechanism whose moving distance is known, and the piece 133 is moved up and down.
The protrusion amount of the piece 133 can be corrected without disassembling the mold, and the cost of the correction can be reduced. Also,
During molding, the piece 133 is not removed from the injection molding machine without removing it.
Can be corrected. (2) By providing a means for recovering from an operation failure, it is possible to recover the bite of the inclined piece without disassembling the mold, and it is possible to reduce the cost by reducing labor. In addition, since the recovery means can be configured with a simple configuration including the tapped holes and the screws, it is possible to prevent the cost of the mold from increasing.

Also, since the amount of protrusion of the gate mark from the molded product after the gate portion is cut off is small and the cut cross section is stably and finely finished, a molded product with good performance can be obtained.

Further, since the insert member is securely held by the fluid pressure cylinder or the like, it is not necessary to reduce the mold clamping speed, so that the molding cycle can be shortened and a high quality molded article can be obtained. Further, it is possible to prevent the mold from being damaged due to the insert member falling and being caught between the molds.

The present invention can be applied to a modification or modification of the above embodiment without departing from the gist of the invention.

[0100]

As described above, according to the present invention,
The following effects are obtained. (1) KN-plated thin plate forming pieces are formed by changing the plating thickness on the side in contact with the resin and on the side opposite to the resin. The production yield of the pieces can be improved, and the processing cost of the formed pieces can be reduced.

(B) Burr can be prevented during molding. (2) Providing a processing part for plating thickness measurement allows (a) plating thickness to be accurately processed to a predetermined value.

(B) It is easy to distinguish between front and back. (3) The inclined piece is moved by a minute feed mechanism whose moving distance is known, and the formed piece is moved up and down, so that the amount of protrusion of the formed piece can be corrected without disassembling the mold, thereby reducing the cost of correction. be able to. Also, during molding,
The protrusion amount of the molding piece can be corrected without removing the mold from the injection molding machine. (4) By providing a means for recovering from an operation failure, it is possible to recover the bite of the inclined piece without disassembling the mold, and it is possible to reduce labor by reducing labor. In addition, since the recovery means can be configured with a simple configuration including the tapped holes and the screws, it is possible to prevent the cost of the mold from increasing. (5) Since the amount of protrusion of the gate mark from the molded product after the gate portion is separated is small, and the cut cross section is stably and finely finished, a molded product with good performance can be obtained. (6) Since the insert member is securely held by the fluid pressure cylinder or the like, there is no need to reduce the mold clamping speed, so that the molding cycle can be shortened and a high quality molded body can be obtained. Further, it is possible to prevent the mold from being damaged due to the insert member falling and being caught between the molds.

[0103]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part around a cavity of an injection mold according to an embodiment.

FIG. 2 is an enlarged view of a molding piece of FIG. 1;

FIG. 3 is a diagram showing the warpage of a molding piece at room temperature.

FIG. 4 is a diagram showing a warp state when the temperature of the molding piece is raised to the molding temperature.

FIG. 5 is a diagram showing a relationship between a plating thickness and a warpage amount.

FIG. 6 is a cross-sectional view of an injection mold according to one embodiment, which is divided into four parts.

FIG. 7 is an enlarged view of a cavity portion in FIG.

FIG. 8 is an external perspective view of a molding piece.

FIG. 9 is a diagram showing a configuration of a molding piece.

FIG. 10 is a diagram showing a state where a chamfer is applied to a molding piece.

FIG. 11 is a view showing a molding piece having a non-uniform thickness.

FIG. 12 is a diagram showing a state in which the bottom and side portions of a molding piece are processed and a plating thickness is measured.

FIG. 13 is a view showing a conventional warp correcting method for generating a warp by supporting a molding piece at both ends and applying a load to the center.

FIG. 14 is a diagram showing a conventional warp correcting method for forming a warped shape by machining.

FIG. 15 is a perspective view showing a shape of a molded product formed by an injection mold according to a second embodiment.

FIG. 16 is an enlarged view of a portion A in FIG.

FIG. 17 is a cross-sectional view showing a structure in which a mold for forming and processing a grooved top plate is divided into four parts.

18 is a cross-sectional view of a main part around a cavity of FIG. 17;

FIG. 19 is an enlarged view of a portion c in FIG. 18;

FIG. 20 is a diagram schematically showing the shape of a molding piece.

FIG. 21 is a diagram showing a configuration for recovering from a malfunction of the inclined piece.

FIG. 22 is a diagram showing a configuration for recovering from a malfunction of the inclined piece.

FIG. 23 is a diagram showing a first modification of the second embodiment.

FIG. 24 is a diagram showing a second modification of the second embodiment.

FIG. 25 is a diagram showing a third modification of the second embodiment.

FIG. 26 is a diagram showing a fourth modification of the second embodiment.

FIG. 27 is a side view of the grooved top plate formed by the mold of the present embodiment, that is, a view of FIG. 15 as viewed in the direction of arrow D.

FIG. 28 is a view of FIG. 15 as viewed from the direction of arrow E.

FIG. 29 is a view showing the shape of a gate formed by the mold apparatus according to the second embodiment.

FIG. 30 is a view showing a V-shaped notch formed in a gate portion.

FIG. 31 is a diagram showing a configuration of a cutting machine.

FIG. 32 is a diagram showing a configuration of a cutting machine.

FIG. 33 is a diagram showing a state of a mold before installation of an insert member.

FIG. 34 is a view showing a state where the insert member is fixed at a predetermined position.

FIG. 35 is a view showing an insert member.

FIG. 36 is a schematic diagram of a so-called full-line type inkjet head having a width corresponding to the recording width of a recording medium, and a recording apparatus equipped with the inkjet head.

FIG. 37 is a diagram showing a conventional example.

FIG. 38 is a diagram showing a conventional example.

FIG. 39 is a diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 fixed piece 2 slide piece 3 holding piece 4 forming piece 4c base material of forming piece 4d KN plating portion of forming piece 4f surface of forming piece in contact with resin 5 nesting pin 6 movable piece 11 cavity 45 chamfer for plating thickness measurement

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masazumi Sakuragi 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Masahiro Haneda 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Satoru Mochizuki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (26)

[Claims] 1. A molding piece for an injection molding die, wherein KN plating is applied to the front and back surfaces of a thin plate-shaped molding piece main body, and the thicknesses of the KN plating layers on the front and back surfaces are varied. 2. The injection mold according to claim 1, wherein the plating thickness of the front and back surfaces is set based on the physical property values of the molding piece main body and the plating material and the thickness of the molding piece main body. Molded piece. 3. The method according to claim 1, wherein one of the front and back plating layers is processed to a predetermined thickness, the plating thickness is measured, and the other surface is processed to a predetermined thickness. Molding piece of the injection molding die according to 1. 4. The injection molding according to claim 3, wherein the measurement of the plating thickness is performed by chamfering a portion not involved in molding of the molding piece and measuring a plating thickness of an exposed portion thereof. Molding piece for mold. 5. The measurement of the plating thickness is performed by cutting an end face portion not involved in molding of the molding piece over the entire surface in a thickness direction and measuring a plating thickness of an exposed portion thereof. A molding piece for the injection mold according to claim 3. 6. The thickness of the plating layers on the front and back sides is set such that when the main body of the molding piece is heated, the molding piece warps in a predetermined direction by a bimetal effect. Item 2. A molding piece of the injection molding die according to Item 1. 7. The injection molding according to claim 6, wherein the predetermined direction is a direction in which the molding piece main body comes into close contact with another mold constituent member constituting a mold. Molding piece for mold. 8. A molding piece in which KN plating is applied to the front and back surfaces of a thin plate-shaped molding piece main body and KN plating layers on the front and back sides are made different in thickness, whereby the molding piece is warped due to a change in mold temperature. A mold for injection molding, wherein a clearance between the molding piece and a peripheral mold member is offset. 9. A mold for injection molding, wherein the plating thickness of the front and back surfaces is set based on the physical property values of the molding piece main body and the plating material and the thickness of the molding piece main body. 10. The molding piece is characterized in that one surface of the front and back plating layers is processed to a predetermined thickness, the plating thickness is measured, and the other surface is processed to a predetermined thickness. The mold for injection molding according to claim 8, wherein 11. The method according to claim 10, wherein the measurement of the plating thickness of the molding piece is performed by chamfering a portion not involved in the molding of the molding piece and measuring the plating thickness of the exposed portion. Mold for injection molding. 12. The measurement of the plating thickness of the molding piece is performed by cutting an end face portion not involved in the molding of the molding piece over the entire surface in the thickness direction and measuring the plating thickness of the exposed portion. The mold for injection molding according to claim 10, wherein 13. The thickness of the plating layers on the front and back surfaces of the molding piece is set such that the molding piece warps in a predetermined direction due to a bimetal effect when the temperature of the molding piece body is raised to the temperature at the time of molding. The injection molding die according to claim 8, wherein: 14. The injection molding according to claim 13, wherein the predetermined direction is a direction in which the molding piece main body comes into close contact with another mold component constituting a mold. Mold. 15. A mold body, a molding piece mounted on the mold body, fine movement means for finely moving the molding piece with respect to the mold body, and a relative position of the molding piece with respect to the mold body. A mold for injection molding, comprising: a measuring means for measuring a position. 16. A holding member mounted on the molding piece and having a first slope inclined at a predetermined angle with respect to a first direction, which is a moving direction of the molding piece, A slide member that is inclined by the predetermined angle in a second direction substantially perpendicular to the direction of the second direction and has a second slope contacting the first slope, and a feed mechanism that moves the slide member in the second direction. The mold for injection molding according to claim 15, comprising: 17. The injection mold according to claim 16, wherein the predetermined angle is equal to or less than 25 °. 18. The injection mold according to claim 16, wherein the feed mechanism is a feed mechanism using a feed screw. 19. The injection mold according to claim 16, further comprising recovery means for recovering the operation when the fine movement means becomes inoperative. 20. The image forming apparatus according to claim 10, wherein the recovery unit includes the holding member and / or
20. The injection mold according to claim 19, further comprising a tap hole formed in the slide member and a rod screwed into the tap hole. 21. A molding piece positioning method for positioning a molding piece with respect to the mold body by slightly moving the molding piece with respect to the mold body, the moving direction of the molding piece being attached to the molding piece. The first
And a holding member having a first slope inclined at a predetermined angle with respect to the first direction, and a holding member inclined at the predetermined angle in a second direction substantially orthogonal to the first direction and in contact with the first slope. Contacting with a slide member having a second inclined surface; moving the slide member in the second direction to form
And a step of finely moving the molding piece in the first direction by slipping between the slope and the second slope. 22. An injection molding die for insert-molding a long insert member inside a long molded body, comprising: a mold main body; and a mold main body; A mold for injection molding, comprising: a support member that supports both ends of an insert member; and driving means for driving the support member to enter and exit the mold body. 23. The injection molding die according to claim 22, wherein said driving means comprises a fluid pressure cylinder. 24. The injection molding die according to claim 22, wherein said driving means comprises a servomotor. 25. An injection molding die for molding a long molding by injection molding, comprising: a long cavity formed in the die; and a resin material in the cavity. The injection gate,
A gate provided long along the longitudinal direction of the cavity. 26. A projection for forming a V-shaped groove extending in the longitudinal direction at a position near the gate of the molded body, the gate being formed at the gate. The injection mold according to claim 25, wherein