CN113478742A

CN113478742A - Injection mold capable of realizing autorotation demolding of upper mold

Info

Publication number: CN113478742A
Application number: CN202110738905.9A
Authority: CN
Inventors: 蒋林才
Original assignee: Suzhou Jab Alwayseal Technology Ltd
Current assignee: Suzhou Jab Alwayseal Technology Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-10-08
Anticipated expiration: 2041-06-30
Also published as: CN113478742B

Abstract

The invention provides an injection mold for upper mold autorotation demolding, which comprises a base plate, an A plate, a helical tooth forming insert, a bearing, an upper mold core, a B plate, a lower mold core and an ejector pin, wherein the helical tooth forming insert is rotatably arranged in the A plate through the bearing and is matched with the lower mold core and the upper mold core to form an injection mold cavity, when the A plate is separated from the B plate, the helical tooth forming insert slowly autorotates in situ under the driving of a helical gear product, the helical tooth forming insert and an upper mold core forming end are revolving bodies, the upper mold core forming end is arranged in the helical tooth forming insert, the base plate is arranged on one side of the A plate, which is far away from the B plate, the lower mold core is embedded in the B plate, and the ejector pin penetrates through the B plate and the lower mold core until reaching the bottom surface of the injection mold cavity. According to the invention, the helical tooth forming insert is rotatably arranged on the upper die in situ, so that the autorotation demoulding of a helical gear product with a blocking block on one side of helical teeth and a product packing force on one side of the blocking block larger than that of the other side of the helical teeth is well realized, the demoulding efficiency is high, the stability is good, and the automatic integrated production of the helical gear product is convenient to realize.

Description

Injection mold capable of realizing autorotation demolding of upper mold

Technical Field

The invention relates to the technical field of complex and precise mold manufacturing, in particular to an injection mold with an upper mold capable of being subjected to autorotation demolding.

Background

Injection molding is a process used to mass produce parts of some complex shapes. Specifically, the plastic melted by heating is injected into a mold cavity from an injection molding machine at high pressure, and a formed product is obtained after cooling and solidification.

When the helical gear product is injection-molded, the mode of demoulding by adopting the rotation of the lower die is easy generally, but as the helical gear product shown in figure 3, because one side of the helical gear part contains the blocking block, the two sides of the helical gear part are not communicated, the blocking block can only be considered to be arranged close to one side of the upper die, but because the product structure is special, the product packing force of one side, close to the blocking block, of the helical gear product is found to be larger than the product packing force of the other side, the blocking block needs to be arranged close to one side of the lower die for the convenience of demoulding, at the moment, the situation that the product is difficult to demould by adopting the traditional mode of demoulding by adopting the rotation of the lower die is found, and a new scheme needs to be designed for realizing.

Disclosure of Invention

The invention aims to solve the problem that the helical gear product is provided with a blocking block, the packing force of one side of the blocking block of the product is larger than that of the other side of the blocking block, and the rapid and stable demoulding is difficult to realize.

In order to achieve the purpose, the invention adopts the following technical scheme:

an injection mold for self-rotation demolding of an upper mold comprises an upper mold component and a lower mold component, wherein the lower mold component is separated from the upper mold component along a first direction when the injection mold is opened, the upper mold component comprises a base plate, an A plate, a helical tooth forming insert, a bearing and an upper mold core, the lower mold component comprises a B plate, a lower mold core and an ejector pin, the base plate is arranged on one side, far away from the B plate, of the A plate, the helical tooth forming insert is rotatably hung in the A plate through the bearing, the helical tooth forming insert is matched with the lower mold core and the upper mold core to form an injection mold cavity of a helical gear product, when the A plate is separated from the B plate, the helical tooth forming insert slowly self-rotates in situ under the driving of the helical gear product, one side, close to the lower mold core, of the upper mold core is an upper mold core forming end, the helical tooth forming insert and the upper mold core forming end are rotary bodies, the upper mold core forming end is inserted in the helical tooth forming insert, and the lower mold core is embedded in the B plate, the thimble passes through the B plate and the lower mold core until reaching the bottom surface of the injection molding cavity.

Optionally, the bearing is a ball bearing, removably mounted in the a plate.

Optionally, one side of the upper mold core close to the base plate is an upper mold core fixing end, and the upper mold core fixing end is hung in the plate A in a non-rotatable mode.

Preferably, the fixed end of the upper die core is fixed on the A plate and the base plate through a plurality of bolts.

Preferably, the fixed end of the upper die core is fixed on the A plate and the base plate through two bolts.

Preferably, the fixed end of the upper mold core is in a non-revolving body structure.

Optionally, the rotation center lines of the helical tooth forming insert and the upper mold core forming end are overlapped.

Optionally, the shim plate is removably attached to the a plate.

Optionally, the ejector pins are provided with a plurality of ejector pins, and the ejector pins are uniformly distributed on the bottom surface of the injection molding cavity.

Optionally, the upper die assembly further comprises an upper die fixing plate and a stripper plate, and the stripper plate is located between the upper die fixing plate and the backing plate and used for stripping waste materials along the first direction.

Compared with the prior art, the helical gear forming insert is arranged on the upper die in a rotating mode in situ, so that the self-rotation demoulding of the helical gear product with the blocking block on one side of the helical gear and the packing force of the product on one side of the blocking block larger than that of the product on the other side is well realized, the design structure is simple and practical, the demoulding efficiency is high, the stability is good, and the automatic integrated production of the helical gear product is convenient to realize.

Drawings

Fig. 1 is a schematic structural view of an injection mold with an upper mold being autorotated and demolded at a viewing angle according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an injection mold with an upper mold being autorotated and demolded at another view angle according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a helical gear product.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

As shown in fig. 1 and 2, an injection mold 100 for upper mold autorotation demolding comprises an upper mold assembly 1 and a lower mold assembly 2, wherein the lower mold assembly 2 is separated from the upper mold assembly 1 along a first direction X when the injection mold 100 is opened.

The upper die assembly 1 comprises a backing plate 11, an A plate 12, a helical tooth forming insert 13, a bearing 14 and an upper die core 15, and the lower die assembly 2 comprises a B plate 21, a lower die core 22 and an ejector pin 23.

The helical tooth forming insert 13 is rotatably arranged in the a plate 12 through a bearing 14, the helical tooth forming insert 13 includes an annular hanging end 131 and a forming end 132, the annular hanging end 131 is hung on the end surface of the bearing 14 far away from the lower mold core 15, the forming end 132 is provided with a plurality of helical racks, the forming end 132 is used for matching the lower mold core 22 and the upper mold core 15 to form an injection mold cavity 102 of a helical gear product 101 (as shown in fig. 3), and when the a plate 12 and the B plate 21 are separated, the helical tooth forming insert 13 slowly rotates in situ under the driving of the helical gear product 101. This ensures that the helical gear product 101 is smoothly released from the helical tooth molding insert 13.

The upper core 15 has an upper core molding end 151 on a side thereof adjacent to the lower core 22, the helical tooth molding insert 13 and the upper core molding end 151 are solid of revolution, and the upper core molding end 151 is inserted into the helical tooth molding insert 13.

The lower die core 22 is embedded in the B plate 21.

The shim plate 11 is arranged on the side of the a plate 12 remote from the B plate 21. This arrangement facilitates the assembly and securing of the helical tooth forming insert 13, the bearing 14 and the upper die core 15 within the B plate 21.

The ejector pins 23 penetrate through the B plate 21 and the lower core 22 to the bottom surface of the injection mold cavity 102. The molded helical gear product 101 is conveniently ejected.

Optionally, the bearings 14 are ball bearings that are removably mounted within the A-plate 12. Because the rotating speed of the bearing 14 is low during demoulding, the requirement can be met by adopting the ball bearing, and meanwhile, the purchase cost of the ball bearing is low compared with that of other types of bearings.

Optionally, one side of the upper mold core 15 close to the backing plate 11 is an upper mold core fixing end 152, and the upper mold core fixing end 152 is non-rotatably hung in the a plate 12. Therefore, the upper die core 15 can be prevented from being driven by the helical tooth forming insert 13 to rotate, and the stability of the helical gear product 101 in the process of disengaging can be prevented from being influenced.

Preferably, upper core securing end 152 is secured to a plate 12 and backing plate 11 by a plurality of bolts. This fixation can effectively prevent the rotation of the upper mold core 15. Specifically, the upper core securing end 152 is secured to the a plate 12 and the backing plate 11 by two bolts. In this case, the cost is lower while the rotation of the upper mold core 15 is effectively prevented.

Preferably, the upper core securing end 152 is of a non-rotating body construction. For example, the upper die fixing end 152 may have a D-shaped cross section, which is convenient and effective for preventing the rotation of the upper die 15.

Optionally, the turning center lines of the helical tooth forming insert 13 and the upper mold core 15 are coincident. The stress is more balanced, and the demoulding process is more stable.

Alternatively, the backing plate 11 may be removably attached to the A-plate 12. The detachable backing plate 11 is arranged to facilitate the disassembly, assembly and maintenance of the helical tooth forming insert 13, the bearing 14 and the upper mold core 15.

Optionally, the ejector pins 23 are provided in plurality and uniformly distributed on the bottom surface of the injection mold cavity 102. The arrangement of the plurality of ejector pins 23 can enable the stress of the helical gear product 101 to be more balanced during ejection.

Optionally, the upper die assembly 1 further includes an upper die fixing plate 16 and a stripper plate 17, the stripper plate 17 is located between the upper die fixing plate 16 and the backing plate 11, and the stripper plate 17 can be separated from the upper die fixing plate 16 and the backing plate 11 along the first direction X, respectively. The waste material can be automatically removed by the arrangement, and the automatic integration of the processing of the injection mold is convenient to realize.

The demolding working process of the embodiment of the invention comprises the following steps:

after the injection mold 100 finishes injection molding, the stripper plate 17 is firstly stripped from the upper mold fixing plate 16 and the backing plate 11 respectively along the first direction X, the a plate 12 and the B plate 21 then begin to separate, and the helical gear product 101 follows the B plate 21 and the lower core 22 and leaves the helical gear forming insert 13 in the first direction X, with the helical teeth of the helical gear forming insert 13 and the helical gear product 101 (see figure 3) in engagement, when the helical gear product 101 is far away from the upper die core 15 along the first direction X, the helical teeth of the helical gear product 101 apply a force to the helical teeth forming insert 13 in a direction perpendicular to the helical teeth, since the helical tooth forming insert 13 cannot move toward the lower core 22 along the first direction X, the acting force perpendicular to the helical tooth direction only leaves a tangential force that causes the helical tooth forming insert 13 to rotate in situ along with the bearing 14, when the helical teeth of the helical gear product 101 are completely disengaged from the helical tooth molding insert 13, the ejector pins 23 eject the helical gear product 101 directly from the lower mold core 22 in the first direction X.

According to the injection mold for the self-rotation demolding of the upper mold, the helical tooth forming insert is arranged on the upper mold in a rotating mode, so that the self-rotation demolding of a helical gear product with a blocking side and a product tightening force of the blocking side larger than that of the other side is well realized, the demolding efficiency is high, the stability is good, and the automatic integrated production of the helical gear product is convenient to realize.

The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.

Claims

1. An injection mold with an upper mold capable of realizing autorotation demolding is characterized by comprising an upper mold component and a lower mold component, wherein the lower mold component leaves away from the upper mold component along a first direction when the injection mold is opened, the upper mold component comprises a base plate, a plate A, a helical tooth forming insert, a bearing and an upper mold core, and the lower mold component comprises a plate B, a lower mold core and a thimble;

the backing plate is arranged on one side of the A plate far away from the B plate;

the helical tooth forming insert is rotatably arranged in the plate A through the bearing, the helical tooth forming insert is matched with the lower die core and the upper die core to form an injection molding cavity of a helical gear product, and when the plate A is separated from the plate B, the helical tooth forming insert slowly rotates in situ under the driving of helical teeth of the helical gear product;

one side of the upper mold core close to the lower mold core is an upper mold core forming end, the helical tooth forming insert and the upper mold core forming end are rotary bodies, and the upper mold core forming end is inserted in the helical tooth forming insert;

the lower die core is embedded in the plate B;

the thimble penetrates through the B plate and the lower mold core to reach the bottom surface of the injection molding cavity.

2. An injection mold according to claim 1, wherein the bearings are ball bearings removably mounted in the A plate.

3. The injection mold of claim 1, wherein the side of the upper mold core adjacent to the backing plate is an upper mold core fixing end which is non-rotatably suspended in the A plate.

4. The injection mold of claim 3, wherein the upper core securing end is secured to the A plate and the backing plate by a plurality of bolts.

5. The injection mold of claim 4, wherein the upper core securing end is secured to the A plate and the backing plate by a plurality of bolts.

6. The injection mold of claim 3, wherein the upper core securing end is of a non-solid of revolution configuration.

7. The injection mold of claim 1, wherein the helical tooth forming insert and the upper core forming end have a centerline of revolution that coincides.

8. The injection mold of claim 1, wherein the shim plate is removably attached to the a plate.

9. The injection mold of claim 1, wherein the plurality of pins are uniformly distributed on the bottom surface of the injection cavity.

10. The injection mold of claim 1, wherein the upper mold assembly further comprises an upper mold securing plate and a stripper plate positioned between the upper mold securing plate and the backing plate for stripping scrap material in the first direction.