JP3060559B2 - Screw type resin injection equipment for composite molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw-type resin injection device used for composite molding such as multi-material, multi-color molding, and more particularly to a screw-type resin injection molding compound used in combination with a general injection molding machine. The present invention relates to a screw-type resin injection device used for an injection device.

[0002]

2. Description of the Related Art Composite molding such as multi-material, multi-color molding generally uses individual primary molding dies and secondary molding dies, and a resin (resin material) is used for each of the molding dies. This is performed by a dedicated machine having a plurality of screw-type resin injection devices that individually perform injection filling.

[0003]

In a special-purpose machine for performing composite molding such as multi-material, multi-color molding, a plurality of screw-type resin injection devices are each capable of injecting a thermoplastic resin. It is of a driven type, and as a result, a dedicated compound molding machine is often large and expensive compared to a normal injection molding machine. This is multi-material,
This causes an increase in the production cost of a composite molded article such as multicolor molding.

In particular, in the secondary molding process, a relatively small amount of rubber material for elastic sealing is used instead of a sealing member such as a gasket or an O-ring mainly for molded articles such as a hermetic case and cover made of a thermoplastic resin. In the case of injection molding, for example, injection of rubber materials does not require a full-scale screw-type resin injection device capable of injecting thermoplastic resin, and this is a simple screw-type resin with low injection pressure etc. It is performed by a large-scale composite molding machine equipped with a plurality of full-scale screw-type resin injection devices capable of injecting a thermoplastic resin, despite being sufficiently performed by an injection device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional composite molding, and is intended to be attached to a conventional injection molding machine in an attachment manner so that the conventional injection molding can be performed. It is an object of the present invention to provide a composite-type screw-type resin injection device that can be a simple double-injection molding machine for composite molding.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided an injection molding method for performing a composite molding by injecting a resin material or a rubber material different from the resin constituting the primary molded product into the primary molded product. In the composite molding screw type resin injection device used for the molding machine, an injection cylinder chamber is configured inside,
An injection cylinder member having a resin injection nozzle at one end, an injection screw rotatably and axially movable in the injection cylinder chamber, an electric motor that rotationally drives the injection screw, A pneumatic cylinder device that drives the injection screw in the axial direction is configured as one assembly, and the assembly is configured to be attached to a tie bar that guides the movement of the movable mold holding plate of the injection molding machine. This is achieved by a screw-type resin injection device for composite molding.

[0007]

According to the above construction, the assembly functions as a single unitized screw type resin injection device,
Since this is attached to a tie bar, a usual existing injection molding machine becomes a double injection molding machine for composite molding.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 12 shows an example of a conventional horizontal injection molding machine to which a screw type resin injection device for composite molding according to the present invention is assembled.

The horizontal injection molding machine is guided on a base 200 by a conventional hydraulically driven screw type resin injection device 202 for thermoplastic resin injection, a fixed platen 204, and a tie bar 206, and left and right in the figure. Movable plate 208 that can move in any direction
And a mold clamping device 210 for driving the movable plate 208 in the left-right direction in the figure.

The movable platen 208 has a primary and secondary common mold 212.
The primary die 218 and the secondary die 220 are exchangeably mounted on the fixed plate 204 by a slide die exchange bed 214 and a mounting plate 216.

[0013] As shown in FIG.
8 is configured to perform molding of the main body M of the composite molded article, and is brought to a position where it engages with the primary / secondary common mold 212 during the primary molding, whereas the secondary mold 220 is formed of the composite molded article. The band-shaped elastic seal portion S is configured to be formed, and at the time of secondary molding, is brought to a position where it is engaged with the primary and secondary common mold 212 as shown in the figure.

The primary molding for molding the main body M of the composite molded product is performed by PP, P from the screw type resin injection device 202.
It is performed by injection of a thermoplastic resin such as BT, PC, ABS, PA-6, PA-66 or a thermosetting resin such as epoxy or phenol.

On the other hand, in the secondary molding for molding the elastic seal portion S of the composite molded product, the resin injection hole 222 formed in the partition between the secondary mold 220 and the primary secondary common mold 212 is formed. The injection is performed by injecting rubber such as liquid silicone, urethane, soft vinyl chloride, and olefin, or elastic resin.
This is performed by a composite molding screw type resin injection device 226 attached by the above.

FIGS. 1 and 2 show the detailed structure of the composite molding screw type resin injection device 226 as an injection device for a multi-liquid reaction-curable resin such as silicone rubber. Screw-type resin injection device 22 for injection molding
6 is a cylinder fixing base 3 fixed on the forward and backward moving substrate 1
The cylinder fixing base 3 fixedly holds the injection cylinder member 5 in a horizontal posture.

The injection cylinder member 5 constitutes an injection cylinder chamber 7 inside, and a tapered cylinder head member 9 for holding an injection nozzle is connected to one end on the same axis.

An injection screw 11 is disposed in the injection cylinder chamber 7 of the injection cylinder member 5 so as to be rotatable about its own central axis and movable in the axial direction. As shown in FIGS. 3 to 5, the injection screw 11 has a relatively large pitch, a triangular screw-shaped screw pump operating section 13 having a large lead angle, and is provided in front of the screw pump operating section 13. Screw pump action part 1
And a mixing screw portion 15 having a smaller pitch than that of No. 3 and a small lead angle. The mixing screw portion 15 is provided with four axial grooves 17 having a rectangular cross section having a depth equal to the screw height at equal intervals in the circumferential direction over the entire area in the axial direction.

At the tip of the injection screw 11, FIG.
As shown in FIG. 8, a screw head member 19 is provided.
Are screwed and fixed, and a seal ring member 23 is externally fitted to the shaft portion 21 of the screw head member 19 so as to be movable in the axial direction. The seal ring member 23 is axially movable between a seal seat surface 25 formed by the distal end surface of the injection screw 11 and an end surface 27 of the screw head member 19 opposed thereto, as shown in FIG. By shutting off the communication between the nozzle side and the screw side of the injection cylinder chamber 7 by seating on the seal seating surface 25, the seating surface is seated on the end surface 27 as shown in FIG. 25, the shaft 21
And the three cut grooves 35 formed in the head 33 of the screw head member 19 to allow the nozzle side and the screw side of the injection cylinder chamber 7 to communicate with each other. The reason why the number of the axial grooves 17 and the number of the cut grooves 35 are set to an even number and an odd number is to shift the phases of the two and to promote the kneading action.

On the outer periphery of the seal ring member 23, two O-rings 37 are axially spaced from each other for sealing between the outer peripheral surface of the seal ring member 23 and the inner peripheral surface of the injection cylinder member 5. It is provided.

A nozzle device 39 with a valve is attached to the tip of the cylinder head member 9. As shown in FIG. 9, the valve-equipped nozzle device 39 includes a nozzle body 43 inserted into the distal end hole 41 of the cylinder head member 9 so as to be movable in the axial direction, and a nozzle body 43 in the injection cylinder chamber 7. A spool valve ring 47 which is circumscribed in the thin shaft portion 45 so as to be relatively displaceable in the axial direction, a valve seat member 49 fixed to the rear end of the thin shaft portion 45, and the nozzle body 43 are connected to the cylinder head member 9. And a compression coil spring 51 that urges the valve body 43 toward the valve closing side, that is, to the left side in the figure, and the nozzle body 43 against the spring force of the compression coil spring 51 by the touch pressure with the molding die. By moving the valve seat member 49 relative to the member 9 to the right in the drawing, the valve seat member 49 is separated from the contact with the spool valve ring 47, and the valve hole 53 provided in the small shaft portion 45 in the radial direction is formed in the cylinder chamber 7. To expose You have me. The valve hole 53 communicates with the guide hole 55 extending in the axial direction at the center of the nozzle body 43 and the nozzle hole 57 connected to the guide hole 55. It leads to the hole 57.

An O-ring 59 for sealing is provided on the outer periphery of the nozzle body 43.

As shown in FIGS. 1 and 2, an O-ring 61 is provided near the rear end of the injection screw 11 to prevent the resin from leaking backward.

A plunger shaft 63 is coaxially fixedly connected to the rear end of the injection screw 11. A reverse screw 6 for preventing the resin from leaking rearward is provided on the outer periphery of the portion where the plunger shaft 63 is fitted with the injection cylinder member 5.
The mechanical seal 67 is provided between the plunger shaft 63 and the cylinder fixing base 3.

The plunger shaft 63 is connected to the injection cylinder member 5.
Projecting rearward from the rear end, and this projection is rotatably and axially moved around its own central axis by a linear motion bearing 71 held by a bearing support member 69 fixed to the cylinder fixing base 3. Supported as possible.

A flange 73 is provided in the vicinity of the rear end of the plunger shaft 63, and the plunger shaft 63 in this portion is provided.
As shown in FIG. 2, the drive arm 7
One end of 5 is axially connected so as to be relatively rotatable with a needle thrust bearing 79 interposed between an end ring 77 fixedly mounted on the plunger shaft 63 and a flange 73.

As shown in FIG. 2, the drive arm 75 extends in the radial direction of the injection cylinder member 5 and is connected at its distal end to the distal end of the cylinder rod 83 of the pneumatic cylinder device 81. I have. The pneumatic cylinder device 81
It is arranged parallel to the side of the injection cylinder member 5 and is fixed to the side wall of the cylinder fixing base 3.

A shaft receiving hole 85 is formed at the rear end of the plunger shaft 63 so as to extend in the axial direction at the center of the plunger shaft 63 and open to the rear end surface of the plunger shaft 63. The rotary drive shaft 89 can be inserted into and removed from the shaft receiving hole 85 by a torque transmission type linear motion bearing 87, in other words, is fitted to the plunger shaft 63 in a telescopic manner in a torque transmitting relationship.

The rotation drive shaft 89 is connected to an output shaft 93 of a motor 91 fixed on the forward / backward moving board 1 by a coupling 95 in a torque transmitting relationship.

A resin supply block 97 is fixed to the cylinder fixing base 3. In this embodiment, as shown in FIG. 10, a resin material supply tube 99 also serving as a measuring cylinder is provided in the resin supply block 97 for injection molding of a two-component reaction-curable resin. Are mounted in parallel with each other. The resin material supply tube 99 has a resin supply block 97 having a resin discharge port 101 at the tip.
Is communicated with the resin passage 103 provided in the first passage. The resin passage 103 is connected to a resin passage 10 of the resin supply block 97 through a rotary valve 105 provided in the resin supply block 97.
7, a resin supply port 111 provided in the resin passage 109 of the cylinder fixing base 3 and an intermediate portion of the injection cylinder member 5
Is selectively communicated with.

The rotary valve 105 is of a manual type that is rotated by a manual lever 113. When the rotary valve 105 is in a rotating position as shown in FIGS. 1 and 11, when it is turned 90 degrees counterclockwise from the turning position as shown in FIGS. 1 and 11, the washing solvent passage 115 formed in the resin supply block 97 is made into resin. The passage 103 and the resin passage 107 are communicatively connected to each other. When the passage 103 is turned 180 degrees counterclockwise from the turning position shown in FIGS. The communication is interrupted to connect the cleaning solvent passage 115 to the resin passage 107, and the communication between the resin passage 103 and the resin passage 107 is interrupted to connect the cleaning solvent passage 115 to the resin passage 103. You have me.

As shown in FIG. 11, each of the resin material supply tubes 99 has a resin intake port 117 at the distal end side, and each of the resin intake ports 117 is a liquid material from a separate resin material tank 119. Resin material is resin supply pipe 1
21, on-off valve 123, and resin supply pipe 125.

The cleaning solvent passage 115 communicates with a cleaning solvent supply port 127 provided in the resin supply block 97 so that the cleaning solvent is supplied from a cleaning solvent tank 129 via a cleaning solvent supply pipe 131. It has become.

A piston 133 is fitted into each of the resin material supply tubes 99, and the resin material in the resin material supply tube 99 is moved from the resin discharge port 101 by moving the piston 133 to the left in the drawing. The liquid is discharged to the passage 103.

The resin supply block 97 is provided with a resin material supply tube pneumatic cylinder device 135.
It is attached in parallel with. In the pneumatic cylinder device 135 for feeding resin material, a connecting plate 139 is attached to the tip of a piston rod 137, and one end of two push rods 141 is fixedly connected to the connecting plate 139, respectively. A push pad 143 is attached to each end of the push rod 141, and the push pad 143 is connected to the piston 1 of the resin material supply tube 99.
33, and is pressed to the left in the figure.

A U-shaped position detection rod 145 is attached to the push pad 143, and a switch support rod 147 is attached to the resin supply block 97 in parallel with the resin material supply tube 99. Proximity switches 149 and 151 that perform switching by proximity of a switch sensitive member 153 attached to the tip of the position detection rod 145 are attached to the switch support rod 147 so that the attachment position can be adjusted. Thereby, the push pad 143 and the resin material supply tube 99
The axial position of the piston 133 is monitored.

In this embodiment, a cooling jacket 159 is attached to a portion where the injection cylinder member 5 is exposed to the outside on the front side to prevent the resin in the injection cylinder chamber 7 from hardening. ing.

The forward / backward moving substrate 1 is connected to a moving table 157 of a rodless pneumatic cylinder device 155, and is moved forward and backward by the rodless pneumatic cylinder device 155.

The rodless pneumatic cylinder device 155 is fixed to a movable table 230 which is located on a base member 228 and is movable in the Y-axis direction (left-right direction in FIG. 1) by groove engagement. The movable table 230 is fixed at an arbitrary position in the Y-axis direction by a lock bolt 232. The movable table 230 is provided with brackets 224 on the upper and lower sides, respectively. Each of the brackets 224 has an engagement hole 234.
The tie bar 206 is circumscribed so as to be movable in the axial direction with the upper and lower tie bars 206, and is fixed to an arbitrary axial position of the tie bar 206 (the X-axis direction, that is, a direction penetrating the paper plane of FIG. 1 at right angles) by the lock bolt 236. It has become.

Thus, the nozzle position of the screw molding resin injection device 226 for composite molding corresponds to the resin injection hole 222 (see FIG. 13) formed in the partition between the secondary mold 220 and the primary and secondary common mold 212. Is fine-tuned.

In order to form the elastic seal portion S of the composite molded product, the composite molding screw type resin injection device 226 is used to fill the resin injection hole 222 in the partition between the secondary mold 220 and the primary secondary common mold 212. On the other hand, the injection of the elastic resin is performed after the completion of the primary molding, and when the elastic resin is injected by the screw-type resin injection device 226 for composite molding,
First, the pneumatic cylinder device 135 for feeding resin material is driven in a state where the rotary valve 105 is in the rotating position as shown in FIG. 1 or FIG. 11, and each of the resin material is pushed by the push rod 141 and the push pad 143. The piston 133 of the supply tube 99 is pressed to the left in the drawing, whereby the resin material of each resin material supply tube 99 is supplied to the resin passage 103, the rotary valve 105, and the resin passages 107 and 109.
Through the resin supply port 111 and into the injection cylinder chamber 7 of the injection cylinder member 5. Along with this, the rotation drive shaft 89 is rotationally driven by the electric motor 91, and the rotation is transmitted to the plunger shaft 63 and the injection screw 11 by the torque transmission type linear motion bearing 87. As a result, they rotate around their own central axis, and the resin material fed into the injection cylinder chamber 7 is moved forward in the injection cylinder chamber 7 by the screw pump action of the screw pump action section 13 of the injection screw 11. That is, it is fed to the mixing screw part 15 by pressure.

Since the mixing screw portion 15 is provided with an axial groove 17 throughout the axial direction, the resin material from each of the resin material supply tubes 99 fed to the mixing screw portion 15 has a compressive action. While receiving, a part flows along the screw groove of the mixing screw part 15, and the remaining resin material advances through each axial groove 17, etc., and a plurality of flows are generated. Occurs. Thereby, the kneading of the resin material from each resin material supply tube 99 is performed with high efficiency and uniformity.

The kneaded resin material reaches the tip of the injection screw 11 and presses the seal ring member 23 leftward in the figure, and pushes it open to open the gap 29, the gap 31 and the screw head member 19. It flows to the nozzle side of the cylinder chamber 7 through the cut groove 35.

At this time, the seal ring member 23 does not rotate due to the resistance of the O-ring 37, and only the injection screw 11 and the screw head member 19 rotate.
The seal ring member 23 and the injection screw 11 rotate relative to each other. As a result, the seal ring member 23 is reliably opened, and the gap 29 as the resin passage is reliably secured.

In response to the resin material being charged into the nozzle side of the injection cylinder chamber 7, the reaction force acts on the injection screw 11 as a rightward force in the figure, whereby the injection screw 11 and the plunger The shaft 63 is retracted rightward in the figure. This retreat is performed with low resistance under the guidance of the linear motion bearing 71, and the retreat increases the amount of the rotary drive shaft 89 entering the shaft receiving hole 89,
Even when the plunger shaft 63 and the rotation drive shaft 89 are relatively moved in the axial direction, the rotation of the rotation drive shaft 8
9 is driven by a torque transmitting linear motion bearing 87 by a drive plunger shaft 63 and an injection screw 1.
1 is transmitted without delay.

At this time, the injection screw 11 may be lightly driven together with the plunger shaft 63 by the pneumatic cylinder device 81 to assist the backward movement of the injection screw 11, and a retreat force may be applied to the injection screw 11. In this case, although the plunger shaft 63 is rotating, the drive arm 75 and the plunger shaft 63 are relatively rotatable by the thrust needle bearing 77, so that the rotational drive and the axial drive of the plunger shaft 63 do not interfere with each other. Not compatible.

When a predetermined amount of resin material is filled in the injection cylinder chamber 7, the injection screw 1
The rotation of 1 and the discharge of the resin material from the resin material supply tube 99 by the pneumatic cylinder device 135 are stopped, and then the forward and backward substrate 1 is moved forward by the rodless pneumatic cylinder device 155. Thereby, the cylinder fixing base 3,
The entirety of the injection cylinder member 5 and the injection screw 11 moves forward, the nozzle body 43 comes into contact with the side wall of the molding die, and the nozzle hole 57 is formed between the secondary die 220 and the primary secondary common die 212. The partition portion communicates with the resin injection hole 222.

When the substrate 1 is further moved forward and backward, the cylinder head member 9 is moved to the nozzle body 43.
, The valve seat member 49 is separated from the contact with the spool valve ring 47 to expose the valve hole 53 to the injection cylinder chamber 7, and the injection cylinder chamber 7 passes through the guide hole 55. As a result, the nozzle communicates with the nozzle hole 57.

Next, the injection screw 11 is driven forward by the pneumatic cylinder device 81. Then, first, due to the pressure of the resin material in the injection cylinder chamber 7, the seal ring member 23 moves backward with respect to the screw head member 19 and is seated on the seal seat surface 25, and the nozzle side and the screw side of the injection cylinder chamber 7 are moved. Communication is interrupted. Further, when the injection screw 11 is driven forward, this acts as a piston, and the forward thrust of the injection screw 11 by the pneumatic cylinder device 81 is converted into a resin material in the injection cylinder chamber 7 into an injection pressure, and the injection pressure is changed. Cylinder chamber 7
The resin material inside is injected from the nozzle hole 57 into the resin injection hole 222.

At this time, the resin material in the injection cylinder chamber 7 is filled with the outer periphery of the seal ring member 23 and the injection cylinder member 5.
The backflow leaks backward from the gap between the inner peripheral surface of the injection cylinder and the backflow, but this gap is sealed by the O-ring 37, so that the backflow is avoided. . As a result, pressure loss is eliminated, and a high injection pressure can be obtained. This means
It is particularly useful in the injection molding of a liquid resin having a low viscosity, a high fluidity and a tendency to cause backflow.

In the injection molding of a multi-liquid reaction-effect resin such as silicone rubber, the resin material mixed in the resin passages 107 and 109, the resin supply port 111, the injection cylinder chamber 7 and the like is kept for a predetermined time or more. When the injection is stopped for a certain period of time, the rotary valve 105 is switched, and the cleaning solvent supply port 1 is stopped.
From 27, the washing solvent in the washing solvent tank 129 flows into the resin passages 107 and 109, the resin supply port 111, the injection cylinder chamber 7, and the like, and these can be easily washed with the washing solvent.

FIG. 14 shows another embodiment of the mounting structure of the screw-type resin injection device for composite molding to a horizontal injection molding machine according to the present invention. In this embodiment, a clamp member 238 of a sandwiching type is detachably fixed to each of the upper and lower tie bars 206 of the horizontal injection molding machine by fastening bolts 240, and the upper and lower clamp members 238 are connected to each other by a connecting rod 242 to prevent rotation. Are connected to each other. A bracket 246 is fixed to the lower clamp member 238 by a bolt 244, and a composite molding screw type resin injection device 226 is attached to the bracket 246 by an adjustment bolt 248 so that the mounting height can be adjusted.

The front end of the bracket 246 is supported from the floor by leg bolts 250 whose height can be adjusted.

Therefore, in this embodiment, by adjusting the fixing position of the clamp member 238 with respect to the tie bar 206, the axial direction of the tie bar 206 (X-axis direction, ie, the paper Of the composite resin injection device 226 in the height direction (Z-axis direction) is adjusted by the adjustment bolt 248.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0055]

As will be understood from the above description, the screw-type resin injection device for composite molding according to the present invention is unitized as one assembly, which can be arranged on the injection molding machine by the arrangement position adjusting means. The conventional existing injection molding machine becomes a double injection molding machine for composite molding, whereby the injection molding of the composite molded product can be easily performed. The screw-type resin injection device for compound molding is attached to the tie bar that guides the movement of the movable platen for holding the mold of the injection molding machine, so there is no need to provide a new mounting structure for the injection molding machine for this installation, The screw-type resin injection device for composite molding is guided by the tie bar while being supported by the tie bar, so that the mounting position can be surely adjusted.

[Brief description of the drawings]

FIG. 1 is a side view showing, in partial cross section, one embodiment in which a screw molding resin injection device for composite molding according to the present invention is applied as an injection device for a multi-liquid reaction effect type resin such as silicone rubber.

FIG. 2 is a plan sectional view of a screw portion of the screw-type resin injection device for composite molding shown in FIG.

FIG. 3 is a perspective view showing an embodiment of an injection screw used in the screw injection resin device for composite molding according to the present invention.

FIG. 4 is a half sectional view showing an embodiment of an injection screw used in the screw injection resin device for composite molding according to the present invention.

FIG. 5 is a sectional view taken along the line VV in FIG. 4;

FIG. 6 is an enlarged cross-sectional view showing a closed state of an embodiment of a seal ring portion used in the screw-type resin injection device for composite molding according to the present invention.

FIG. 7 is an enlarged cross-sectional view showing the seal ring portion shown in FIG. 6 in an open state.

FIG. 8 is a sectional view taken along the line VII-VII in FIG. 7;

FIG. 9 is a cross-sectional view showing an embodiment of a nozzle device with a valve used in a screw-type resin injection device for composite molding according to the present invention.

FIG. 10 is an enlarged sectional view taken along line XX of FIG. 1;

FIG. 11 is a partial cross-sectional view showing one embodiment of a resin material supply portion of the screw-type resin injection device for composite molding according to the present invention.

FIG. 12 is a plan view showing an example of a horizontal injection molding machine in which the screw-type resin injection device for composite molding according to the present invention is incorporated.

FIG. 13 is a sectional view showing an example of a molding die used for composite molding.

FIG. 14 is a side view showing one embodiment of a mounting structure of the screw-type resin injection device for composite molding to a horizontal injection molding machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forward / backward moving board 3 Cylinder fixing base 5 Injection cylinder member 204 Fixed plate 206 Tie bar 208 Movable plate 224 Bracket 226 Composite molding screw type resin injection device 238 Clamp member 246 Bracket 248 Adjusting bolt

Continuation of the front page (56) References JP-A-52-102370 (JP, A) JP-A-3-187718 (JP, A) JP-A-60-141515 (JP, A) JP-A-4-339626 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45/84

Claims (1)

(57) [Claims] 1. A composite molding screw type resin injection device used in an injection molding machine for performing composite molding by injecting a resin material and a rubber material different from the resin constituting the primary molded product into the primary molded product. An injection cylinder member having an injection cylinder chamber therein, and having a resin injection nozzle at one end; an injection screw rotatably and axially movable in the injection cylinder chamber; An electric motor that rotationally drives the injection screw and a pneumatic cylinder device that drives the injection screw in the axial direction are configured as one assembly, and the assembly moves the movable platen for holding the mold of the injection molding machine. A screw-type resin injection device for composite molding, which is configured to be attached to a tie bar to be guided.