CN211763198U - Injection mold for shell plastic part - Google Patents

Abstract

The utility model discloses an injection mold for a shell plastic part, which comprises a moving template, a fixed template, a fixed mold insert and a moving mold insert. On the lower side of the fixed formwork, the movable formwork is fixedly connected with a guide post, and the guide post is inserted into the guide sleeve installed on the fixed formwork. On the die base plate, four sides between the movable template and the fixed template are sequentially provided with the first inclined guide column core pulling mechanism, the second inclined guide column core pulling mechanism, the third inclined guide column core pulling mechanism and the fourth inclined guide column core pulling mechanism. The mold of the utility model ensures that each mechanism does not interfere with each other, and realizes the smooth demoulding of the FHB5.20 shell; the mold has a compact structure, stable operation, greatly shortens the manufacturing cycle, and reduces the production cost while meeting the production and use standards. Evenly, avoid warping and deformation of plastic parts, and improve the quality of mold forming.

Description

A shell plastic injection mold

technical field

The utility model relates to an injection mold for a shell plastic part, which belongs to the technical field of injection molds.

Background technique

FHB5.20 shell plastic parts are an important part of a certain electrical shell. The FHB5.20 shell plastic part is a small injection-molded thin-walled part. The basic size of the plastic part is 66.4mm x 20mm x 16.2mm. Its positive triaxial drawing and each view are shown in the figure. The structure of the plastic part is relatively complex. The plastic part contains various molding features such as pores, deep grooves and lateral bosses. Therefore, it is necessary to consider side core pulling; there are 3 places in the plastic part that need to be core-pulled, respectively in the cavity at the right end of the plastic part. , The irregular boss in the middle and the groove formed by the cylindrical boss at the left end and the plastic part, as shown in Figure 1. The maximum wall thickness of the plastic parts is 4.9mm, and the average wall thickness is 1.27mm, which belongs to the injection molding parts with uneven wall thickness; the FHB5.20 shell plastic parts choose PA66 material, which has high strength, good mechanical properties, and tensile and compressive resistance. , wear-resistant. This part is mass-produced, and in order to ensure the precision and economic benefits of the plastic parts, one mold and two cavities are used. The volume of a single plastic part is 5062.82mm ³ , and the total volume of plastic required for one injection is 15.2cm ³ , so SZ-25/20 screw injection molding machine is selected. At the same time, in order to ensure the smooth demoulding of the plastic part, it is necessary to ensure a certain draft angle. The draft angle of this design is 1°, and the corner of the plastic part is chamfered. The precision of the plastic part is MT3, and the surface of the plastic part is Higher quality requirements.

The existing FHB5.20 shell mold has complex structure design, long production cycle, high cost and unstable work. Due to the uneven cooling of the existing FHB5.20 shell mold, the plastic parts produced are prone to warp deformation, thus affecting the quality of the mold.

SUMMARY OF THE INVENTION

The technical problem to be solved by the utility model is to provide an injection mold for a shell plastic part, so as to solve the problems existing in the above-mentioned prior art.

The technical scheme adopted by the utility model is as follows: an injection mold for a shell plastic part, which includes a moving template, a fixed template, a fixed mold insert and a moving mold insert, the moving mold insert is fixedly connected to the upper side of the moving template, and the fixed mold insert The block is fixedly connected to the lower side of the fixed formwork, the movable formwork is fixedly connected with a guide post, and the guide post is inserted into the guide sleeve installed on the fixed formwork. It is fixedly connected to the fixed die base plate, the cavity between the fixed die insert and the movable die insert is connected with a horizontal runner, and the horizontal runner is connected to the gate sleeve through the main channel, and the four sides between the movable die plate and the fixed die plate are in turn. It is provided with the first inclined guide column core pulling mechanism, the second inclined guide column core pulling mechanism, the third inclined guide column core pulling mechanism and the fourth inclined guide column core pulling mechanism. , Inclined guide column core-pulling mechanism 2, inclined guide column core-pulling mechanism 3 and slanted guide column core-pulling mechanism 4 together constitute the casting cavity of the two shell plastic parts, the slanted guide column core-pulling mechanism 1 and the slanted-guide column core-pulling mechanism The third mechanism is located on the side surfaces of the two casting shell plastic parts, respectively, and the second inclined guide column core pulling mechanism and the fourth inclined guide column core pulling mechanism are located on the two end faces of the casting shell plastic parts.

Preferably, the above-mentioned shell plastic injection mold further includes an ejector mechanism installed on the movable template. The ejector mechanism includes a push plate, a push rod and a pull rod, and a plurality of push rods are provided, and the plurality of push rods are fixedly connected A plurality of ejector through holes on the push rod fixing plate and facing the corresponding positions on the movable template and the movable mold insert, the pulling rod is fixedly connected to the center of the push rod fixing plate and facing the corresponding position on the movable template and the movable mold insert. There are multiple pulling through holes in the position, the push rod fixing plate is fixedly connected to the push plate, the push rod fixing plate is fixedly connected with a vertical reset rod, the upper end of the reset rod is movably inserted into the guide through holes on the movable template, and the reset rod A reset spring is sleeved, the reset spring is located between the fixed plates of the push rod of the movable mold plate, and a through hole is arranged at the center of the movable mold base plate facing the center of the push plate.

Preferably, the above-mentioned oblique guide column core-pulling mechanism 1 and oblique guide column core-pulling mechanism 3 have the same structure and are arranged axially symmetrically.

Preferably, the first oblique guide column core-pulling mechanism and the third oblique guide column core-pulling mechanism include a pressing block 1, a slider 1 and an oblique guide column 1, and one end of the slider 1 movably extends into the fixed mold insert and the movable A formed protruding strip is arranged between the module inserts and on the end face, and the other end is obliquely inserted into an oblique guide column 1. The oblique guide column 1 and the pressing block 1 are fixedly connected to the fixed template, and the lower side of the left end of the pressing block 1 is arranged. The locking slope is abutted on the slope surface of the outer end of the slider of the same angle, the slider is located in the chute 1, and the chute 1 is fixedly connected to the movable template.

Preferably, the above-mentioned oblique guide column core-pulling mechanism 1 and slanted guide column core-pulling mechanism 3 further include a limit screw 1 and a limit block 1. The cross-section of the limit block 1 is an L-shaped structure, and the horizontal free end of the lower end is fixedly connected to On the outer end face of the moving template, the limit screw one moves through the upper end of the limit block and is connected to the outer end of the slider, the limit screw one is sleeved with the limit spring one, and the limit spring one is located on the limit screw one. Between the big head and the limit block 1.

Preferably, the two oblique guide column core-pulling mechanisms and the fourth oblique guide column core-pulling mechanism both adopt two side-by-side oblique guide column core-pulling structures of different sizes, and each oblique guide column core-pulling structure includes a second compression block, a sliding The second block and the second inclined guide column, one end of the second sliding block is movably inserted between the fixed die insert and the movable die insert, and the end face is provided with a formed convex strip, and the other end is obliquely inserted into the second inclined guide column. The second guide post and the second pressing block are fixedly connected to the fixed template. The lower side of the left end of the second pressing block is provided with a locking slope, and the locking slope abuts on the slope of the second outer end of the slider at the same angle. It is located in the second chute, which is fixedly connected to the movable template.

Preferably, the second inclined guide column core-pulling mechanism and the fourth inclined guide column core-pulling mechanism further include a second limit screw and a second limit block, the second limit block has an L-shaped cross section, and the lower horizontal free end is fixedly connected to the second On the outer end face of the moving template, the second limit screw moves through the upper end of the second limit block and is connected to the second outer end of the slider. Between the big head and the second limit block.

Preferably, cooling channels are provided on the above-mentioned fixed mold inserts and movable mold inserts.

The beneficial effects of the present utility model: compared with the prior art, the mould of the present utility model ensures that each mechanism does not interfere with each other, and realizes the smooth demoulding of the FHB5.20 shell; the mould structure is compact, the work is stable, and the manufacturing cycle is greatly shortened. While meeting the production and use standards, the production cost is also reduced, the internal cooling is uniform, the plastic parts are prevented from being easily warped, and the quality of the mold is improved.

Description of drawings

Fig. 1 is the top view structure schematic diagram of the present utility model;

Fig. 2 is A-A sectional structure schematic diagram in Fig. 1;

Fig. 3 is B-B sectional structure schematic diagram in Fig. 1;

Figure 4 is a schematic diagram of the three-dimensional structure of the shell plastic part;

Figure 5 is a schematic top view of the shell plastic part;

Figure 6 is a schematic diagram of the left side view of the shell plastic part;

Figure 7 is a schematic diagram of the front view of the shell plastic part;

Fig. 8 is a schematic diagram of the arrangement structure of the internal components of the present invention (removing the movable template, the fixed template, the fixed mold inserts and the moving mold inserts, etc.).

Detailed ways

The present utility model will be further introduced below with reference to the accompanying drawings and specific embodiments.

Example 1: As shown in Figures 1-3 and 8, a shell plastic injection mold includes a movable die plate 5, a fixed die plate 10, a fixed die insert 26 and a movable die insert 27, and the movable die insert 27 passes through the The fifth screw 29 is fixedly connected to the upper side of the movable template 5, the fixed mold insert 26 is fixedly connected to the lower side of the fixed template 10 through the fourth screw 28, the movable template 5 is fixedly connected with a guide column 12, and the guide column 12 is inserted into the fixed template 10. In the installed guide sleeve 13, the movable template 5 is fixedly connected to the movable template base plate 1 through two symmetrical spacers 2, and is connected to the movable template 5 through the movable mold base plate 1 and the cushion block 2 by screws 3 21. The template 10 is fixedly connected to the fixed die seat plate 11, the cavity between the fixed die insert 26 and the movable die insert 27 is connected with a horizontal runner 16, and the horizontal runner 16 is connected to the gate sleeve 15 through the main channel 14, pouring The mouth sleeve 15 is fixedly connected to the middle of the top side of the fixed die base plate 11 by screws 2 17, and the four sides between the movable die plate 5 and the fixed die plate 10 are sequentially provided with an oblique guide column core pulling mechanism 1, an oblique guide column core pulling mechanism 2, and an oblique guide column core pulling mechanism. Guide column core-pulling mechanism 3 and inclined guide column core-pulling mechanism 4, fixed die insert 26, movable die insert 27, oblique guide column core-pulling mechanism 1, oblique guide column core-pulling mechanism 2, oblique guide column core-pulling mechanism 3 Together with the inclined guide column core-pulling mechanism 4, they form the casting cavity of the two shell plastic parts. The second core-pulling mechanism and the fourth inclined guide column core-pulling mechanism are respectively located on both ends of the plastic parts of the casting shell.

Preferably, the above-mentioned plastic shell injection mold further includes a ejector mechanism installed on the movable template 5. The ejector mechanism includes a push plate 3, a push rod 22 and a pull rod 23, and the push rods 22 are provided with multiple The root push rod 22 is fixedly connected to the push rod fixing plate 4 and is facing the multiple ejector through holes in the corresponding positions of the movable template 5 and the movable mold insert 27, and the pulling rod 23 is fixedly connected to the center of the push rod fixing plate 4 and Facing the multiple pulling material through holes in the corresponding positions of the movable template 5 and the movable mold insert 27, the push rod fixing plate 4 is fixedly connected to the push plate 3 through the screw six 30, and the push rod fixing plate 4 is fixedly connected with a vertical The reset lever 24, the upper end of the reset lever 24 is movably inserted into the guide through hole on the movable die plate 5, the reset bar 24 is sleeved with a reset spring 31, and the reset spring 31 is located between the movable die plate 5 and the push rod fixing plate 4, and the movable die seat A through hole is provided at the center of the plate 1 facing the push plate 3 .

Preferably, the above-mentioned oblique guide column core-pulling mechanism 1 and oblique guide column core-pulling mechanism 3 have the same structure and are arranged axially symmetrically.

Preferably, the above-mentioned oblique guide column core-pulling mechanism 1 and oblique guide column core-pulling mechanism 3 both include a pressing block 1 20, a sliding block 1 19 and an inclined guide column 1 18, and one end of the sliding block 1 19 movably extends into the fixed mold insert Between the block 26 and the movable mold insert 27 and the end face is provided with a formed convex strip, and the other end is obliquely inserted into the inclined guide post-18, and the inclined guide post-18 and the pressing block-20 are fixedly connected to the fixed template 10. , the lower side of the left end of the pressing block 1 20 is provided with a locking slope, the locking slope abuts on the outer slope of the slider 19 at the same angle, the slider 19 is located in the chute 1 32, and the chute 1 32 It is fixedly connected to the moving template 5.

Preferably, the above-mentioned oblique guide column core-pulling mechanism 1 and slanted guide column core-pulling mechanism 3 further include a limit screw 1 7 and a limit block 1 9, and the cross-section of the limit block 1 9 is an L-shaped structure, and the lower horizontal free end portion The screw one 6 is fixedly connected to the outer end surface of the movable template 5, the limit screw one 7 moves through the upper end of the limit block one 9 and is connected to the outer end of the slider one 19, and the limit screw one 7 is sleeved with a limit spring One 8, the limit spring one 8 is located between the large head of the limit screw one 7 and the limit block one 9.

Preferably, the two oblique guide column core-pulling mechanisms and the fourth oblique guide column core-pulling mechanism both adopt two side-by-side oblique guide column core-pulling structures of different sizes, and each oblique guide-column core-pulling structure includes a second compression block 33, The second sliding block 34 and the second inclined guide column 35, one end of the second sliding block 34 is movably inserted between the fixed die insert 26 and the movable die insert 27 and the end face is provided with a formed protruding strip, and the other end is obliquely inserted obliquely. The second guide column 35, the second inclined guide column 35 and the second pressing block 33 are fixedly connected to the fixed template 10, and the lower side of the left end of the second pressing block 33 is provided with a locking slope, and the locking slope abuts the slider of the same angle On the slope of the outer end of the second 34, the second sliding block 34 is located in the second chute 36, and the second chute 36 is fixedly connected to the movable template 5.

Preferably, the second inclined guide column core-pulling mechanism and the fourth inclined guide column core-pulling mechanism further include a second limit screw 37 and a second limit block 38. The second limit block 38 has an L-shaped cross-section, and the lower end is a horizontal free end. It is fixedly connected on the outer end face of the movable template 5, the second limit screw 37 moves through the upper end of the second limit block 38 and is connected to the outer end of the second slider 34, the second limit screw 37 is sleeved with the second limit spring 39, and the limit The second position spring 39 is located between the large head of the second limit screw 37 and the second limit block 38 .

Preferably, cooling channels 25 are provided on the above-mentioned fixed mold inserts 26 and movable mold inserts 27 .

Design of sprue: The sprue is designed in a conical shape, which is convenient for the flow of the melt. The cone angle is 3°, and the length of the sprue is 50mm. ; The small end of the main channel is 4mm straight and the big end diameter is 7.5mm.

Design of the runner: Select the runner with trapezoidal cross-section, which has high flow efficiency, small flow resistance and heat loss, and is conducive to the demoulding of the runner, and is more convenient to process. The shunt length is 15mm.

The design of the cold material cavity: in order to collect the condensed material at the front of the melt and prevent the condensed material from entering the cavity before the plastic melt and affecting the quality of the product. The cold material pocket with hook-shaped head pull rod is designed. After injection molding, the condensate in the cavity overlaps with the hook head of the pulling rod, and the pulling rod is fixed on the push rod fixing plate. When the mold is opened, the pulling rod pulls the condensate in the cold material cavity through the hook head, and pushes the condensate in the main channel and the plastic part out of the movable mold.

Gate design: a rectangular side gate is designed with a gate height of 0.7mm. Gate width 2mm. Gate length 0.8mm.

Design of the inclined guide column core-pulling mechanism: The inclined guide column core-pulling mechanism is used to complete the core-pulling of the three complex features on the side of the plastic part. After calculation, the three core pulling distances are: the cavity at the right end of the plastic part is 30.2mm, the cylindrical groove at the left end is 8.9mm, and the boss in the middle is 4.1mm; the corresponding pulling forces are: Q ₁ =1678.54N , Q ₂ =127.63 N , Q ₃ =36.72N.

The design of the inclined guide post: For the convenience of installation, the inclined angle of the inclined guide post is 20°, the diameter is 12mm, and the length is 90mm.

Slider design: the two places with a smaller core-pulling distance use integral sliding blocks, and the one with a larger core-pulling distance adopts the method of fastening the slide block and the formed parts with screws.

Chute design: "T"-shaped groove guide sliding block is designed, and H7/h8 clearance fit is used between the sliding block and the sliding groove, and the guide sliding method is embedded as a whole.

The positioning device of the slider: the slider selects the limit block and the limit screw for positioning. There is a spring on the limit screw, and the slider is pulled outward by the elastic force of the spring, which is more convenient for demolding, and the block can limit The amount of movement of the slider, so that the sliding distance is not too large.

Design of the compression block: In order to ensure that the slider is compressed after the injection mold is closed and bear part of the thrust from the side core, it is necessary to design a compression block. The fixing method of the compression block and the mold is fixed by screws, and the compression block is The wedge angle is 22°.

Design of the ejecting mechanism: The ejecting mechanism of the round push rod is designed, and the diameter of the push rod is 3mm.

Design of the guiding and positioning mechanism: the guiding and positioning mechanism of the guide post and guide sleeve is adopted.

Design of cooling system: This plastic part adopts the casting method of one mold and two parts, so it adopts a single straight cooling water circuit, the diameter of the cooling water pipe is 8mm, the distance between the water pipe and the part is 25mm, and the number of cooling pipes is 4.

The working process of the mold is as follows: the movable and fixed molds are in a closed state under the drive of the injection machine, and the plasticized molten plastic is injected through the screw, passes through the gate sleeve 15, and finally reaches the mold between the movable mold insert and the fixed mold insert. After the pressure is maintained, the cooling water passes through the cooling water channel 25 to cool the plastic parts. After the plastic part is cooled, the mold is opened, the sliders of each core-pulling mechanism move with the inclined guide column, and the inclined guide-column core-pulling mechanism slides backward along the guide chute to realize core-pulling on each side of the plastic part. When ejecting, the push plate 3 moves toward the plastic part, driving the push rod 22 to push out the plastic part and pouring system condensate, and then reset the mold through the reset rod 24, complete a cycle of mold closing, and prepare for the next injection.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. All replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (8)

1. The utility model provides a casing is moulded a ware injection mold which characterized in that: the die comprises a movable die plate (5), a fixed die plate (10), a fixed die insert (26) and a movable die insert (27), wherein the movable die insert (27) is fixedly connected to the upper side surface of the movable die plate (5), the fixed die insert (26) is fixedly connected to the lower side surface of the fixed die plate (10), a guide pillar (12) is fixedly connected to the movable die plate (5), the guide pillar (12) is inserted into a guide sleeve (13) installed on the fixed die plate (10), the movable die plate (5) is fixedly connected to a movable die base plate (1) through two symmetrical cushion blocks (2), the fixed die plate (10) is fixedly connected to a fixed die base plate (11), a cavity between the fixed die insert (26) and the movable die insert (27) is communicated with a horizontal runner (16), the horizontal runner (16) is communicated with a sprue bush (15) through a main runner (14), and an inclined guide pillar core pulling mechanism is sequentially arranged on four sides between the movable die, The inclined guide post core-pulling mechanism II, the inclined guide post core-pulling mechanism III and the inclined guide post core-pulling mechanism IV form a pouring cavity of the two casing plastic parts together with the fixed die insert (26), the movable die insert (27), the inclined guide post core-pulling mechanism I, the inclined guide post core-pulling mechanism II, the inclined guide post core-pulling mechanism III and the inclined guide post core-pulling mechanism IV, the inclined guide post core-pulling mechanism I and the inclined guide post core-pulling mechanism III are respectively positioned on the side surfaces of the two pouring casing plastic parts, and the inclined guide post core-pulling mechanism II and the inclined guide post core-pulling mechanism IV are respectively positioned on two end surfaces of the pouring casing plastic parts.

2. The injection mold for housing moldings as claimed in claim 1, wherein: the material pushing mechanism is characterized by further comprising a material pushing mechanism arranged on the movable template (5), the material pushing mechanism comprises a push plate (3), push rods (22) and a material pulling rod (23), the push rods (22) are arranged in a plurality, the push rods (22) are fixedly connected to a push rod fixing plate (4) and are just opposite to a plurality of material pushing through holes in corresponding positions on the movable template (5) and a movable die insert (27), the material pulling rod (23) is fixedly connected to the center of the push rod fixing plate (4) and is just opposite to a plurality of material pulling through holes in corresponding positions on the movable template (5) and the movable die insert (27), the push rod fixing plate (4) is fixedly connected to the push plate (3), a vertical reset rod (24) is fixedly connected to the push rod fixing plate (4), the upper end of the reset rod (24) is movably inserted into a guide through hole in the movable template (5), a reset spring (31) is sleeved on the reset rod (24), and the reset spring (31), the movable mold base plate (1) is provided with a through hole at the position opposite to the center of the push plate (3).

3. The injection mold for housing moldings as claimed in claim 1, wherein: the first inclined guide post core-pulling mechanism and the third inclined guide post core-pulling mechanism are the same in structure and are arranged in an axial symmetry mode, and the second inclined guide post core-pulling mechanism and the fourth inclined guide post core-pulling mechanism are the same in structure and are arranged in an axial symmetry mode.

4. The injection mold for housing moldings as claimed in claim 1, wherein: the first inclined guide post core pulling mechanism and the third inclined guide post core pulling mechanism respectively comprise a pressing block I (20), a sliding block I (19) and an inclined guide post I (18), one end of the sliding block I (19) movably extends into a position between a fixed die insert (26) and a movable die insert (27), a formed convex strip is arranged on the end face of the sliding block I, the inclined guide post I (18) is obliquely and movably inserted into the other end of the sliding block I (19), the inclined guide post I (18) and the pressing block I (20) are fixedly connected onto a fixed die plate (10), a locking slope surface is arranged on the lower side of the left end of the pressing block I (20), the locking slope surface abuts against the slope surface of the outer end of the sliding block I (19) at the same angle, the sliding block I (19) is located in a sliding groove.

5. The injection mold for housing moldings as claimed in claim 4, wherein: the movable mould plate is characterized by further comprising a first limiting screw (7) and a first limiting block (9), the cross section of the first limiting block (9) is of an L-shaped structure, the horizontal free end of the lower end is fixedly connected to the outer end face of the movable mould plate (5), the first limiting screw (7) movably penetrates through the upper end of the first limiting block (9) and then is connected to the outer end of the first sliding block (19), a first limiting spring (8) is sleeved on the first limiting screw (7), and the first limiting spring (8) is located between the large end of the first limiting screw (7) and the first limiting block (9).

6. The injection mold for housing moldings as claimed in claim 1, wherein: the second inclined guide post core pulling mechanism and the fourth inclined guide post core pulling mechanism both adopt two side-by-side inclined guide post core pulling structures with different sizes, each inclined guide post core pulling structure comprises a pressing block II (33), a sliding block II (34) and an inclined guide post II (35), one end of the sliding block II (34) movably extends into a position between the fixed die insert (26) and the movable die insert (27), the end face of the sliding block II is provided with a formed convex strip, the inclined guide post II (35) is obliquely and movably inserted into the other end of the sliding block II (34), the inclined guide post II (35) and the pressing block II (33) are fixedly connected onto the fixed die plate (10), the lower side of the left end of the pressing block II (33) is provided with a locking slope, the locking slope abuts against the slope face at the outer end of the sliding block II (34) at the same angle, the sliding block II (34.

7. The injection mold for housing moldings as claimed in claim 6, wherein: the cross section of the second limiting screw (37) is of an L-shaped structure, the horizontal free end of the lower end is fixedly connected to the outer end face of the movable template (5), the second limiting screw (37) movably penetrates through the upper end of the second limiting screw (38) and then is connected to the outer end of the second sliding block (34), the second limiting screw (37) is sleeved with the second limiting spring (39), and the second limiting spring (39) is located between the large end of the second limiting screw (37) and the second limiting screw (38).

8. The injection mold for housing moldings as claimed in claim 1, wherein: the fixed die insert (26) and the movable die insert (27) are provided with cooling channels (25).

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