CN111231244A - Helical gear injection mold and helical gear - Google Patents

Abstract

The invention relates to the technical field of dies and provides a helical gear injection mold and a helical gear. And secondly, ejecting the product through a sleeve of the push rod for the second time, so that the tooth removal of the helical gear product is realized.

Description

Helical gear injection mould and helical gear

technical field

The invention relates to the technical field of molds, in particular to a helical gear injection mold and a helical gear.

Background technique

At present, in the process of molding helical gears with injection molds, it is difficult to remove the helical gears from the mold. The structure of the mold can easily affect the rotation of the helical gears when they are demolded, resulting in unsmooth demoulding and even damage to the helical gears.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the above technical problems. According to an embodiment of the present invention, a helical gear injection mold is provided, which can be used to mold an injection molded part with an inner gear ring, and the mold is less difficult to process, takes less time, and helps to improve the precision of the molded product.

The embodiment of the present invention also provides a helical gear that is injection-molded by the above-mentioned helical gear injection mold.

The technical solutions adopted by the embodiments of the present invention to solve the above technical problems are:

In a first aspect, an embodiment of the present invention provides a helical gear injection mold, comprising:

The mold core includes a forming plate, a push plate, a fixing plate and a supporting member, the forming plate is provided with a helical gear ring, the push plate is provided with a groove, and the forming plate is embedded in the concave and fixedly connected to the push plate, the support member passes through the fixed plate and the push plate, the forming plate is sleeved on the upper end of the support member, and the support member is The upper surface is provided with a first concave cavity, the support member is provided with a central hole coaxial with the helical inner gear ring; the fixing plate is provided with a first limit hole, and the support member is provided with A first limiting part is provided;

The first template, facing the side of the mold core, is provided with a second cavity corresponding to the position of the first cavity;

a second template, the fixing plate is fixedly connected to the second template;

A push rod includes a shaft rod and a sleeve sleeved on the shaft rod, the sleeve can be axially relative to the shaft rod, the shaft rod passes through the support member and can be abutting against the inner wall of the second cavity on the first template; the end of the sleeve is located in the central hole;

an ejector pin, arranged on the side of the push rod, the ejector pin passes through the second template and the support member, and can move in the axial direction for ejecting the product;

an ejector rod for pushing the push plate, and the ejector rod and the ejector pin move synchronously;

When the first template and the second template are clamped, the inner surface of the first cavity, the inner surface of the second cavity, the helical gear ring gear surface of the forming plate, the shaft A molding cavity is formed between the outer surface of the mandrel and the end surface of the sleeve.

According to the helical gear injection mold according to other embodiments of the present invention, a first thimble through hole is provided on the support member, and a second thimble through hole is provided on the second template at a position corresponding to the first thimble through hole The first thimble through hole communicates with the molding cavity; the thimble passes through the first template and the supporting member through the second thimble through hole and the first thimble through hole.

According to other embodiments of the helical gear injection mold of the present invention, a cooling channel is provided in the first die plate, and cooling liquid can be passed into the cooling channel to cool the first die plate.

According to other embodiments of the helical gear injection mold of the present invention, a casting channel and a glue feeding channel are provided on the first template, the casting channel is provided on the side of the first template away from the mold core, and the The glue feeding channel communicates with the casting channel and the molding cavity.

According to other embodiments of the present invention, the helical gear injection mold further includes a front cover, the first template is connected to the front cover, and a pouring port is provided on the front cover, and the pouring port is connected to the the pouring channel.

The helical gear injection mold according to other embodiments of the present invention includes an ejector plate assembly and a rear cover plate, the rear cover plate is provided with an ejection hole; the ejector plate assembly includes an ejector plate and a bearing plate, the The ejector pin plate is provided with an ejector pin limit hole, the ejector pin passes through the ejector pin limit hole, and the head end of the ejector pin abuts against the ejector pin limit hole; the abutting plate is connected to the ejector pin plate, and cover one side of the thimble limiting hole.

According to the helical gear injection mold according to other embodiments of the present invention, the sleeve of the push rod includes a barrel portion and a barrel end portion, and the barrel end portion is disposed on an end of the barrel portion away from the molding cavity The outer diameter of the end of the cylinder is larger than the outer diameter of the cylinder, so that a limit step is formed between the cylinder and the end of the cylinder; the thimble plate is provided with a sleeve limit hole, The sleeve passes through the sleeve limiting hole, and the abutting plate covers one side of the sleeve limiting hole.

According to the helical gear injection mold according to other embodiments of the present invention, the axial rod of the push rod includes a rod portion and an end portion, and the end portion is disposed on an end of the rod portion away from the molding cavity; The outer diameter of the end portion is larger than that of the rod portion, so that a limit step is formed between the rod portion and the end portion, a third limit hole is provided on the rear cover, and the shaft rod Passing through the third limiting hole, and being installed in the third limiting hole by a fastener to limit the end of the pivot rod in the rear cover plate.

According to the helical gear injection mold according to other embodiments of the present invention, three thimbles are arranged on the side of the push rod, and the thimbles are circumferentially distributed on the center of the push rod with the central axis of the push rod as the center. around.

On the other hand, an embodiment of the present invention also provides a helical gear, which is injection-molded by the helical gear injection mold of any of the above embodiments.

The helical gear injection mold of the present invention has at least the following beneficial effects:

Through the setting of the mold core, ejector pin, push rod, first template and second template, when demoulding, after the first template is raised, the push plate is first pushed up, and at the same time, the forming plate and the product are pushed away from the bearing. Therefore, the helical gear product is degummed from the second cavity of the support piece and separated from the shaft rod of the push rod, so as to avoid the second cavity hindering the rotation of the helical gear product when the helical gear is dislodged. Then, the product is pushed out twice by the sleeve of the push rod, so as to realize the tooth removal of the helical gear product. When the forming plate rotates, the helical gear rotates along the inner gear ring of the forming plate to remove the teeth to realize the demoulding of the product.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the three-dimensional schematic diagram of one embodiment of the helical gear injection mold;

Figure 2 is a top view of the embodiment shown in Figure 1;

Fig. 3 is the sectional view at A-A place in Fig. 2;

Fig. 4 is an enlarged view of part I in Fig. 3;

Fig. 5 is the sectional view at the B-B place in Fig. 2;

Fig. 6 is the enlarged view of II in Fig. 5;

Fig. 7 is the sectional view at C-C in Fig. 2;

8 is a schematic structural diagram of an embodiment of the first template;

Fig. 9 is the schematic diagram of another angle of Fig. 8;

10 is a schematic structural diagram of an embodiment of a support member;

11 is a schematic structural diagram of an embodiment of a fixing plate;

Figure 12 is a schematic diagram of another angle of Figure 11;

13 is a schematic structural diagram of an embodiment of a push plate;

Figure 14 is a schematic diagram of another angle of Figure 13;

Figure 15 is a schematic structural diagram of an embodiment of a forming plate;

Fig. 16 is a schematic diagram of the helical gear formed by the helical gear injection mold of the present invention;

FIG. 17 is a cross-sectional view of one embodiment of the structure of the push rod, the ejector pin, the support member, the forming plate, and the like.

Detailed ways

This section will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that the present invention can be understood intuitively and vividly. each technical feature and overall technical solution, but it should not be construed as a limitation on the protection scope of the present invention.

In the description of the present invention, if the orientation description is involved, for example, the orientation or positional relationship indicated by "upper", "lower", "front", "rear", "left", "right", etc. is based on the drawings. The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention . If a feature is said to be "set", "fixed", "connected" to another feature, it can be directly set, fixed, or connected to another feature, or it can be indirectly set, fixed, or connected to another feature superior.

In the description of the present invention, if it refers to "several", it means one or more; if it refers to "multiple", it means more than two; if it refers to "greater than", "less than", "more than" ", should be understood as not including this number, if it involves "above", "below", "within", it should be understood as including this number. If it refers to "first", "second" and "third", it should be understood as being used to distinguish technical features, but not as indicating or implying relative importance or implicitly indicating the number or implicit indication of the indicated technical features Contains indicates the order of the indicated technical features.

Also, unless otherwise defined, technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art. The terms used in the present invention are only for describing specific embodiments, not for limiting the present invention.

Fig. 1 is a three-dimensional schematic view of an embodiment of a helical gear injection mold, Fig. 2 is a top view of the embodiment shown in Fig. 1, Fig. 3 is a sectional view at A-A in Fig. 2, Fig. 5 is a cross-sectional view at B-B in FIG. 2, FIG. 6 is an enlarged view at II in FIG. 5, and FIG. 7 is a cross-sectional view at C-C in FIG. 2. Referring to FIGS. 1 to 7, the helical gear injection mold of the present embodiment includes The mold core 30, the first template 10, the second template 20, the push rod 40, the ejector pin 50 and the ejector pin 60, etc., wherein:

The mold core 30 includes a forming plate 31, a push plate 32, a fixing plate 33 and a support member 34. The forming plate 31 is provided with a helical gear ring 311, the push plate 32 is provided with a groove 321, and the forming plate 31 is embedded in the inside the groove 321 and fixedly connected to the push plate 32, the support member 34 passes through the fixed plate 33 and the push plate 32, the forming plate 31 is sleeved on the upper end of the support member 34, and the upper surface of the support member 34 is provided with a first A concave cavity 341, the supporting member 34 is provided with a central hole 342 coaxial with the helical gear ring 311; the fixing plate 33 is provided with a first limiting hole 331, and the supporting member 34 is provided with a first limiting hole 342 department;

On the side of the first template 10 facing the mold core 30 , a second concave cavity 11 is provided at a position corresponding to the first concave cavity 341 , and the fixing plate 33 is fixedly connected to the second template 20 .

The push rod 40 includes an axial rod 41 and a sleeve 42 sleeved on the axial rod 41. The sleeve 42 can be axially relative to the axial rod 41, and the axial rod 41 passes through the support member 34 and can be connected with the first The inner wall of the second cavity 11 on the template 10 abuts against, so that it can be used to form the shaft hole of the helical gear; the end 412 of the sleeve 42 is located in the central hole 342, so that it can be used to form the end of the helical gear shaft sleeve 412.

The ejector pin 50 is arranged on the side of the push rod 40, and the ejector pin 50 passes through the second die plate 20 and the support member 34, and can move in the axial direction for ejecting the helical gear product.

The ejector bar 60 is used to push the push plate 32 to move, and the ejector bar 60 and the ejector pin 50 move synchronously. Therefore, when the ejector pin 50 is pushed to eject the helical gear product, the ejector bar 60 pushes the push plate 32 to move synchronously with the product, so that the forming plate 31 Keep moving with the product.

It also includes a front cover 70 . The first template 10 is connected to the front cover 70 . The front cover 70 is provided with a pouring port 71 , and the pouring port 71 is communicated with the pouring channel 12 .

The injection mold includes an ejector plate assembly 80 and a rear cover plate 90, and the rear cover plate 90 is provided with an ejection hole 92; the ejector plate assembly 80 includes an ejector plate 81 and a bearing plate 82, and the ejector plate 81 is provided with an ejector limit hole 811 , the ejector pin 50 passes through the ejector pin limit hole 811, and the head end of the ejector pin 50 abuts against the ejector pin limit hole 811; the abutting plate 82 is connected to the ejector pin plate 81 and covers one side of the ejector pin limit hole 811 to attach the ejector pin 50 to the ejector pin limit hole 811. The head end is limited in the ejector plate 81. It also includes a top rod plate 83 and a fixed plate 85. The top rod plate 83 is provided with a top rod lower limit hole 84, the top rod 60 passes through the top rod lower limit hole 84, and the end 61 of the top rod 60 is limited to the bottom limit of the top rod. In the position hole 84 , the fixing plate 85 abuts against the lower side of the ejector rod plate 83 , so as to restrict the end of the ejector rod in the lower limit hole 84 of the ejector rod.

The sleeve 42 of the push rod 40 includes a cylindrical portion 421 and a cylindrical end portion 422. The cylindrical end portion 422 is disposed on the end of the cylindrical portion 421 away from the molding cavity 100; the outer diameter of the cylindrical end portion 422 is larger than that of the cylindrical portion 421, so that A limit step is formed between the barrel portion 421 and the barrel end portion 422; a sleeve limit hole 812 is provided on the thimble plate 81, the sleeve 42 passes through the sleeve limit hole 812, and the abutting plate 82 covers the sleeve limit One side of the hole 812 is positioned to restrain the barrel end 422 of the sleeve 42 in the ejector plate 81 .

The axial rod 41 of the push rod 40 includes a rod portion 411 and an end portion 412. The end portion 412 is disposed on one end of the rod portion 411 away from the molding cavity 100; the outer diameter of the end portion 412 is larger than that of the rod portion 411, so that the A limit step is formed between the ends 412 , a third limit hole 91 is provided on the rear cover 90 , and the shaft rod 41 passes through the third limit hole 91 and is installed in the third limit hole 91 by a fastener In order to limit the end portion 412 of the shaft rod 41 in the rear cover plate 90 .

The support member 34 is provided with a first thimble through hole 345, a second thimble through hole 21 is provided at a position corresponding to the first thimble through hole 345 on the second template 20, and the first thimble through hole 345 communicates with the molding cavity 100; 50 passes through the first template 10 and the support member 34 through the second thimble through hole 21 and the first thimble through hole 345, so that the product in the molding cavity 100 can be ejected.

When the first die plate 10 and the second die plate 20 are clamped, the inner surface of the first cavity 341 , the inner surface of the second cavity 11 , the surface of the helical gear ring 311 of the forming plate 31 , and the outer surface of the shaft rod 41 A molding cavity 100 is formed between it and the end face of the sleeve 42, so that the helical gear can be injection-molded.

Through the above-mentioned settings of the mold core 30, the ejector pin 50, the push rod 40, the first mold plate 10 and the second mold plate 20, during demolding, after the first mold plate 10 is raised, the push plate 32 is first pushed up, and at the same time, the molding The plate 31 and the product are pushed away from the support member 34 together, so that the helical gear product is degummed from the second cavity 11 of the support member 34 and separated from the shaft rod 41 of the push rod 40, so as to prevent the helical gear from dislodging. The second cavity 11 hinders the rotation of the helical gear product. Then, the product is pushed out by the sleeve 42 of the push rod 40 for the second time, so as to realize the tooth removal of the helical gear product. It can rotate relative to the forming plate 31 , and the helical gear rotates along the inner gear ring 311 of the forming plate 31 to remove the teeth, so as to realize the demoulding of the product.

Three ejector pins 50 are arranged on the side of the push rod 40 in this embodiment, and the ejector pins 50 are circumferentially distributed around the push rod 40 with the central axis of the push rod 40 as the center, so as to ensure that when the ejector pins 50 push out the product, the product can be evenly Force.

FIG. 8 is a schematic structural diagram of an embodiment of the first template, and FIG. 9 is a schematic diagram of another angle of FIG. 8. Referring to FIGS. 3 to 9 at the same time, in this embodiment, the first template 10 faces the side of the mold core 30, corresponding to The position of the first cavity 341 is provided with the second cavity 11 . The first mold plate 10 is provided with a cooling channel 13, and the cooling liquid can be passed into the cooling channel 13 to cool the first mold plate 10, and the cooled first mold plate 10 can cool down the product to be formed in the molding cavity 100, so as to reduce the temperature. Speed up product formation. The first template 10 is provided with a pouring channel 12 and a glue feeding channel 14 . The pouring channel 12 is disposed on the side of the first template 10 away from the mold core 30 , and the glue feeding channel 14 communicates with the pouring channel 12 and the molding cavity 100 .

10 is a schematic structural diagram of an embodiment of the support member 34, FIG. 11 is a structural schematic diagram of an embodiment of the fixing plate 33, and FIG. 12 is a schematic diagram of another angle of FIG. 11, 12, in this embodiment, the upper surface of the support member 34 is provided with a first cavity 341, the position of which corresponds to the position of the second cavity 11 on the first template 10. When the mold is closed, the first cavity 341 It is enclosed with the second cavity 11 on the first template 10 and is used to form the upper and lower surfaces of the lower gear product; the support member 34 is provided with a central hole 342 coaxial with the helical gear ring 311 for pushing The shaft rod 41 of the rod 40 passes through, forming the inner surface of the central bush of the helical gear.

The support member 34 is limited and fixed by the fixing plate 33 . Referring to FIG. 10 and FIG. 11 , the support member 34 is provided with a limit boss 343 , and the limit boss 343 is provided with a flat position 344 , which is correspondingly provided on the fixing plate 33 A mounting plane 332 is provided at the position of the first limiting hole 331 corresponding to the flat position 344, and in cooperation with the flat position 344, the supporting member 34 can be prevented from rotating circumferentially in the first limiting hole 331, so as to ensure that each bearing The orientation of the parts 34 is consistent, so as to achieve the consistency of the injection molded products. The first limiting hole 331 is set as a counterbore, and the large end of the counterbore is set on the side of the fixing plate 33 away from the second cavity 11 of the support member 34 . Therefore, the support member 34 passes through the large end of the counterbore In the first limiting hole 331 , the limiting boss 343 is limited in the counterbore, and the fixing plate 33 is fixedly installed on the second template 20 . Therefore, the side of the second template 20 opposite to the supporting member 34 can support the supporting member 34 . The limiting boss 343 of the support member 34 is limited in the fixing plate 33 to realize the axial limit of the support member 34 .

FIG. 13 is a schematic structural diagram of an embodiment of the push plate 32 , and FIG. 14 is a schematic view of another angle of FIG. 13 . Referring to FIGS. 3 , 4 , 13 and 14 , in this embodiment, the push plate 32 is provided with a molding plate mounting The groove 323 and the through hole 324 of the support member, the forming plate 31 can be embedded in the forming plate mounting groove 323 and fastened with fasteners, so that the forming plate 31 can move with the movement of the push plate 32 . The forming plate mounting groove 323 is coaxially provided with a through hole for the upper part of the supporting member 34 to pass through, and the push plate 32 is abutted against the fixing plate 33. Therefore, the forming plate 31 can be sleeved on the supporting member 34 and the forming plate 31 The inner gear ring 311 is coaxial with the central hole 342 on the support member 34 , and the lower edge of the inner gear ring 311 abuts against the upper surface of the support member 34 .

FIG. 15 is a schematic structural diagram of an embodiment of the forming plate 31 , FIG. 16 is a schematic diagram of a helical gear molded by the helical gear injection mold of the present invention, and FIG. 17 is a push rod 40 , a thimble 50 , a support member 34 , a forming plate 31 , etc. 3, 4, 15, 16, and 17, the forming plate 31 is provided with an inner gear 311 for forming the helical gear D ring gear, and the bottom of the forming plate 31 is provided with a groove 312. , so that it can be sleeved on the upper surface of the support member 34 , so the lower edge of the inner gear 311 can abut against the upper surface of the support member 34 , thereby enclosing a part of the surface of the molding cavity 100 . The upper part of the helical gear D is formed by the second cavity 11 on the first template 10, and the lower part is formed by the first cavity 341 on the support member 34. The center hole D2 of the intermediate shaft sleeve D1 and the lower end of the shaft sleeve D1 412 is formed by the shaft rod 41 of the push rod 40 and the end 412 of the sleeve 42 . When demoulding, first push the lower surface of the helical gear D through the ejector pin 50, and disengage the lower part of the helical gear D from the supporting member 34 and the axial rod 41 of the push rod 40. At the same time, as can be seen from the above, the push plate 32 drives the molding. The plate 31 moves up synchronously. At this time, the helical gear D is still located between the forming plates 31, and the sleeve 42 of the push rod 40 abuts the lower end 412 of the shaft sleeve to push the formed helical gear D out. , the helical gear D can rotate relative to the inner gear ring 311 on the forming plate 31 during the ejection process, so that the teeth are gradually removed.

The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments, and those skilled in the art can also make various equivalent deformations or replacements on the premise that does not violate the spirit of the present invention , these equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.

Claims (10)

1. A helical gear injection mold, comprising:

the mold core comprises a forming plate, a push plate, a fixing plate and a supporting piece, wherein the forming plate is provided with a helical tooth inner gear ring, the push plate is provided with a groove, the forming plate is embedded in the groove and is fixedly connected to the push plate, the supporting piece penetrates through the fixing plate and the push plate, the forming plate is sleeved at the upper end of the supporting piece, the upper surface of the supporting piece is provided with a first concave cavity, and the supporting piece is provided with a central hole which is coaxial with the helical tooth inner gear ring; the fixing plate is provided with a first limiting hole, and the bearing piece is provided with a first limiting part;

the first template faces one side of the mold core, and a second concave cavity is arranged at the position corresponding to the first concave cavity;

the fixing plate is fixedly connected to the second template;

the push rod comprises an axis rod and a sleeve sleeved on the axis rod, the sleeve can axially face the axis rod, and the axis rod penetrates through the bearing piece and can be abutted against the inner wall of the second cavity on the first template; the end of the sleeve is positioned in the central hole;

the ejector pin is arranged beside the push rod, penetrates through the second template and the supporting piece, can move along the axial direction and is used for ejecting a product;

the ejector rod is used for pushing the push plate, and the ejector rod and the ejector pin move synchronously;

when the first template and the second template are matched, a forming cavity is defined by the inner surface of the first cavity, the inner surface of the second cavity, the surface of the helical tooth ring gear of the forming plate, the outer surface of the axle center rod and the end surface of the sleeve.

2. The helical gear injection mold according to claim 1, wherein a first thimble through hole is provided on the supporting member, a second thimble through hole is provided on the second mold plate at a position corresponding to the first thimble through hole, and the first thimble through hole is communicated with the molding cavity; the ejector pin penetrates through the first template and the bearing piece through the second ejector pin through hole and the first ejector pin through hole.

3. The helical gear injection mold according to claim 1, wherein a cooling channel is provided in the first mold plate, and a cooling fluid is introduced into the cooling channel to cool the first mold plate.

4. The helical gear injection mold according to claim 1, wherein the first mold plate is provided with a pouring channel and a glue inlet channel, the pouring channel is arranged on one surface of the first mold plate far away from the mold core, and the glue inlet channel is communicated with the pouring channel and the molding cavity.

5. The helical gear injection mold according to claim 4, further comprising a front cover plate, wherein the first mold plate is connected to the front cover plate, and a pouring gate is arranged on the front cover plate and communicated with the pouring channel.

6. The bevel gear injection mold according to claim 1, comprising a top pin plate assembly and a back cover plate, wherein the back cover plate is provided with a top hole; the ejector pin plate assembly comprises an ejector pin plate and a supporting plate, an ejector pin limiting hole is formed in the ejector pin plate, the ejector pin penetrates through the ejector pin limiting hole, and the head end of the ejector pin is supported on the ejector pin limiting hole; the supporting plate is connected to the ejector pin plate and covers one side of the ejector pin limiting hole.

7. The helical gear injection mold of claim 6, wherein said sleeve of said push rod comprises a barrel portion and a barrel end portion, said barrel end portion being disposed on an end of said barrel portion remote from said molding cavity; the outer diameter of the barrel end is larger than that of the barrel part, so that a limiting step is formed between the barrel part and the barrel end; the thimble plate is provided with a sleeve limiting hole, the sleeve penetrates through the sleeve limiting hole, and the abutting plate covers one side of the sleeve limiting hole.

8. The helical gear injection mold according to claim 6, wherein the axial center rod of the push rod comprises a rod portion and an end portion, the end portion is arranged at one end of the rod portion, which is far away from the forming cavity; the outer diameter of the end part is larger than that of the rod part, so that a limiting step is formed between the rod part and the end part, a third limiting hole is formed in the rear cover plate, the axle rod penetrates through the third limiting hole and is installed in the third limiting hole through a fastening piece, and the end part of the axle rod is limited in the rear cover plate.

9. The bevel gear injection mold of claim 1, wherein three ejector pins are arranged beside the push rod, and the ejector pins are circumferentially distributed around the push rod with a central axis of the push rod as a center.

10. A helical gear, characterized by being injection molded by the helical gear injection mold of any one of claims 1 to 9.

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