CN219947117U - Forming die - Google Patents

Abstract

The embodiment of the utility model discloses a forming die, wherein a first insert is arranged to be capable of moving in a telescopic manner relative to a first sleeve, and a plurality of first cylindrical surfaces for forming the inner diameter of a lens barrel are arranged on a core head, so that the core head and the first sleeve can be spliced with each other to form a forming surface. Therefore, on one hand, before the first sleeve member is separated from the second die body part, the core head can be firstly pulled out of the die cavity, and the position accuracy of the inner diameter of the lens cone is ensured. On the other hand, in the process of extracting the first insert, the first insert can be matched with the coaxiality and cylindricity of the first cylindrical surface through the cooperation of the first insert and the guide part, so that the condition that the inner diameter precision of the lens barrel is reduced due to die opening is further avoided. In still another aspect, after the first insert is pulled out, the first mold body portion and the second mold body portion are opened, so that the difficulty in opening the mold of the injection molded object is reduced, and the injection molded object after opening the mold can be kept on the second mold body portion.

Description

Forming die

Technical Field

The utility model relates to the technical field of injection molding, in particular to a molding die.

Background

The lens acts as an important optical device of the camera, and the precision plays a vital role in imaging of the camera. The lens barrel in a camera is used for fixing a lens, and is generally manufactured through an injection molding process. When the number of lenses is large, it is necessary to ensure the relative positional accuracy between the plurality of lenses. Therefore, the requirement of the inner diameter of the lens barrel on the form and position tolerance is relatively strict in manufacturing. How to improve the manufacturing accuracy of the lens barrel is a problem to be solved.

Disclosure of Invention

In view of the above, the embodiment of the utility model provides a forming die, which utilizes the guide part to guide the movement of the first insert, thereby ensuring the movement precision of the core print in the process of extracting from the product.

The forming die of the embodiment of the utility model comprises:

a first mold body portion having a first molding surface;

the second die body part is provided with a second molding surface, and the second molding surface moves linearly relative to the first molding surface and is combined to form a die cavity;

the first die body part comprises a first sleeve and a first insert in pairs, the first sleeve is provided with a first channel, the first insert comprises a core head which can move linearly along the first channel, the core head extends out of the first channel and is spliced with the end face of the first sleeve, facing the second molding surface, to form the first molding surface, the core head is provided with a plurality of first cylindrical surfaces, the plurality of first cylindrical surfaces are arranged in the moving direction of the core head, the diameter of the first cylindrical surfaces close to the second die body part is smaller than the diameter of the first cylindrical surfaces far away from the second die body part, and the coaxiality of the plurality of first cylindrical surfaces is set in a preset range;

the first driving plate is arranged above the first die body part;

and

the guide part comprises a guide column and a matching piece sleeved on the guide column, the guide column is connected with the first driving plate, the matching piece is arranged on the first die body part, and the guide part and the first insert synchronously move.

Further, the matching piece is a needle bearing, and the outer diameter of the guide post is matched with the inner diameter of the needle bearing.

Further, the first insert has a drive head extending from a side of the first channel remote from the cavity, the drive head having a first rotation-stopping surface in a lateral direction, the first sleeve having a second rotation-stopping surface in a lateral direction,

the first mold body portion further includes:

the first die holder is provided with a mounting hole and a connecting hole, the first external member is mounted in the mounting hole, the driving head stretches into the connecting hole, and the shapes of the mounting hole and the connecting hole are respectively matched with the second rotation stopping surface and the first rotation stopping surface.

Further, the first sleeve comprises a second column surface and a positioning boss, the positioning boss protrudes towards the periphery of the second column surface, and the second rotation stopping surface is positioned on the side wall of the positioning boss;

the first die holder further comprises a first body and a pressing plate, the first body is provided with a mounting groove, the mounting hole is a step hole, the step hole penetrates through the first body, the large-diameter end of the step hole is communicated with the bottom of the mounting groove and is matched with the second rotation stopping surface, the small-diameter end of the step hole is matched with the second column surface, and the connecting hole penetrates through the pressing plate;

the positioning boss is in a state of being abutted against the table top of the step hole, and the pressing plate is simultaneously pressed against the top surfaces of the positioning boss and the pressing plate.

Further, the forming mold further includes:

one end of the connecting rod is connected with the driving head, and the other end of the connecting rod is connected with the first driving plate;

the guide post is provided with a connecting end far away from the first die body part, and the connecting end is connected with the first driving plate.

Further, the number of the cavities is multiple and distributed around the center of the forming die;

the connecting rods are multiple in number and are connected with the first external members of the cavities in a one-to-one correspondence mode.

Further, the forming mold further includes:

the core head extraction part comprises a belleville spring set and a driving piece, wherein the driving piece comprises a rod body and a pushing boss, and the rod body penetrates through the belleville spring set and is connected with the pushing boss;

the core head extraction part is positioned between the first driving plate and the first die holder, and the elastic force of the belleville spring group acts on the first driving plate and the first die holder at the same time;

the belleville spring set is in a compressed state, the core head forms part of the first molding surface, the belleville spring set is in a released state, and the core head moves in a direction away from the cavity, wherein the compression amount of the belleville spring set is smaller than 0.5mm.

Further, the first die body part is provided with a main runner, and the number of the die cavities is multiple and uniformly distributed around the main runner;

the first die body part is provided with a plurality of first diversion trenches, and the second die body part is provided with second diversion trenches corresponding to the first diversion trenches one by one;

the first die body part and the second die body part are in an involution state, a plurality of first diversion trenches and a plurality of second diversion trenches are involuted to form a plurality of sub-channels, one end of each sub-channel is communicated with each cavity, and the other end of each sub-channel is communicated with the main channel.

Further, the second die body part is provided with a plurality of through holes, and the through holes are respectively communicated with the die cavity, the position, close to the die cavity, of the second diversion trench and the communication position of the second diversion trench and the main runner;

the forming die further includes:

the ejection part comprises a second driving plate and a plurality of ejection rods which are in one-to-one correspondence with the through holes, and one end of each ejection rod is fixedly connected with the second driving plate;

the second driving plate is fixedly connected with the ejector rod and drives the ejector rod to extend out of the through hole.

Further, the second mold body portion includes a pair of second sleeve and second insert;

the second sleeve is provided with a second channel, the second insert is detachably arranged in the second channel, the second molding surface and the first molding surface are in a involution state, and the core head is abutted to the end face of the second insert.

According to the forming die provided by the embodiment of the utility model, the first insert can move in a telescopic manner relative to the first sleeve, and the plurality of first cylindrical surfaces for forming the inner diameter of the lens barrel are arranged on the core head, so that the core head and the first sleeve can be spliced into a forming surface. Therefore, on one hand, before the first sleeve member is separated from the second die body part, the core head can be firstly pulled out of the die cavity, and the position accuracy of the inner diameter of the lens cone is ensured. The condition that the product precision is reduced when the first insert and the first sleeve are opened together is avoided. On the other hand, in the process of extracting the first insert, the first insert can be matched with the coaxiality and cylindricity of the first cylindrical surface through the cooperation of the first insert and the guide part, so that the condition that the inner diameter precision of the lens barrel is reduced due to die opening is further avoided. In still another aspect, after the first insert is pulled out, the first mold body portion and the second mold body portion are opened, so that the difficulty in opening the mold of the injection molded object is reduced, and the injection molded object after opening the mold can be kept on the second mold body portion.

Drawings

The above and other objects, features and advantages of the present utility model will become more apparent from the following description of embodiments of the present utility model with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view showing a structure of a molding die according to an embodiment of the present utility model;

FIG. 2 is a schematic view of another side of a molding die according to an embodiment of the present utility model;

FIG. 3 is an exploded view of one side of a molding die according to an embodiment of the present utility model;

FIG. 4 is an exploded view of a molding die on the other side of an embodiment of the present utility model;

FIG. 5 is a schematic cross-sectional view of an embodiment of the present utility model at A-A in FIG. 2;

FIG. 6 is an enlarged partial schematic view of a second mold body portion according to an embodiment of the present utility model;

FIG. 7 is an enlarged partial schematic view of a first mold body portion according to an embodiment of the present utility model;

FIG. 8 is a schematic view of the assembly of a first sleeve, a first insert, a second sleeve, and a second insert according to an embodiment of the present utility model;

FIG. 9 is an exploded view of one side of a first sleeve, a first insert, a second sleeve, and a second insert according to an embodiment of the present utility model;

FIG. 10 is an exploded view of the other side of the first sleeve, first insert, second sleeve, and second insert of an embodiment of the present utility model;

FIG. 11 is a schematic cross-sectional view of one side of a first sleeve, a first insert, a second sleeve, and a second insert of an embodiment of the present utility model;

FIG. 12 is a schematic view of an injection molded article according to an embodiment of the present utility model.

Reference numerals illustrate:

1-a first mold body portion;

11-a first kit; 111-a second rotation stop surface;

12-a first insert; 121-core print; 122-a first cylinder; 123-driving head; 124-a first stop surface;

13-a first channel;

14-a first die holder; 141-mounting holes; 142-connecting holes; 143-a first body; 144-pressing plates; 145-mounting slots;

15-second column surface;

16-positioning bosses;

2-a second mold body portion;

21-a through hole;

22-an ejector part; 221-a second drive plate; 222-ejector pins;

23-a second set; 231-a second channel;

24-a second insert;

3-a cavity; 31-a first molding surface; 32-a second molding surface;

4-a guide;

41-a guide post; 411-connecting end;

42-mating member;

51-a first drive plate; 52-a base; 53-locknut; 54-sprue bush;

61-connecting rods;

7-a core print extraction section;

71-belleville spring sets; 72-a driving member; 721-rod body; 722-pushing the boss;

81-a first diversion trench; 82-a second diversion trench; 83-a main runner; 84-split runners;

a-injection molding;

a1-a framework; a2-product.

Detailed Description

The present utility model is described below based on examples, but the present utility model is not limited to only these examples. In the following detailed description of the present utility model, certain specific details are set forth in detail. The present utility model will be fully understood by those skilled in the art without the details described herein. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the utility model.

Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.

Unless the context clearly requires otherwise, the words "comprise," "comprising," and the like throughout the application are to be construed as including but not being exclusive or exhaustive; that is, it is the meaning of "including but not limited to".

Spatially relative terms, such as "inner," "outer," "lower," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Fig. 1 and 2 are schematic views of structures of a molding die in different directions. The forming die in fig. 1 includes a first die body portion 1, a second die body portion 2, a first drive plate 51, and a base 52. The forming die in fig. 2 does not show the first drive plate 51.

Fig. 3 and 4 are schematic explosion diagrams of the molding die in different directions. Only the first drive plate 51, the first mold body portion 1 and the second mold body portion 2 are shown in fig. 4.

Fig. 5 is a schematic cross-sectional view at A-A in fig. 2. The positions of the guide 4, the cavity 3 and the core drawing 7 are shown in cross section.

Fig. 6 and 7 are partial enlarged schematic views of the second and first mold body portions 2 and 1, respectively. Only two second sets 23 are shown in fig. 7.

Fig. 8 to 11 are a schematic structural view, an exploded schematic view, and a schematic sectional view of the first sleeve 11, the first insert 12, the second sleeve 23, and the second insert 24, respectively.

Fig. 12 is a schematic structural view of an injection molded article a. The injection molded object A in the figure comprises two parts of a framework A1 and a product A2. The skeleton A1 in the drawing is an injection-molded article a located in the main runner 83 and the branch runner 84 after the molding die is opened. In contrast, the product A2 is the injection-molded article a located in the cavity 3. Only one product A2 morphology is shown.

In some embodiments, as shown in fig. 1-5, the forming mold includes a first mold body portion 1, a second mold body portion 2, a first drive plate 51, and a guide portion 4. Referring still further to fig. 8-11, the first mold body portion 1 has a first molding surface 31. The second mold body portion 2 has a second molding surface 32, and the second molding surface 32 moves linearly with respect to the first molding surface 31 and is joined to form the cavity 3. The first mold body portion 1 includes a pair of first sleeve members 11 and a first insert 12, the first sleeve members 11 are provided with first channels 13, the first insert 12 includes a core print 121, the core print 121 is operable to move linearly along the first channels 13, the core print 121 extends from the first channels 13 and is spliced with an end face of the first sleeve members 11 facing the second molding surface 32 to form the first molding surface 31, the core print 121 has a plurality of first cylindrical surfaces 122, the plurality of first cylindrical surfaces 122 are arranged in a moving direction of the core print 121, a diameter of the first cylindrical surfaces 122 near the second mold body portion 2 is smaller than a diameter of the first cylindrical surfaces 122 far from the second mold body portion 2, and coaxiality of the plurality of first cylindrical surfaces 122 is set in a predetermined range. The first drive plate 51 is disposed above the first mold body portion 1. Meanwhile, the guiding part 4 comprises a guiding column 41 and a matching piece 42 sleeved on the guiding column 41, the guiding column 41 is connected with the first driving plate 51, the matching piece 42 is arranged on the first die body part 1, and the guiding part 4 and the first insert 12 synchronously move.

In one particular form of the core print 121 illustrated in fig. 5, there are 6 first cylindrical surfaces 122 on the core print 121 and the diameters decrease in sequence. The coaxiality and cylindricity of the 6 first cylindrical surfaces 122 are configured to be less than 0.001mm.

Specifically, as shown in fig. 5, the mating member 42 is shown on the first mold body portion 1, and the guide post 41 is connected to the first driving plate 51. The guide post 41 is guided in movement by the engagement member 42 so that the first insert 12, which moves in synchronization with the guide post 41, can also move along a straight line. Meanwhile, the upper cross-sectional view in fig. 5 and fig. 11 each show the first insert 12 in a state before being pulled out. In this state, the core 121 is inserted into the cavity 3 and abuts against the bottom of the second molding surface 32. The enlarged view on the left side of fig. 5 shows the first insert 12 after being withdrawn from the cavity 3, in which the core 121 has moved a small distance from the cavity 3, i.e., L2. In this form, the first cylindrical surfaces 122 on the core print 121 are separated from the stepped holes (i.e., the inner diameter region of the barrel) inside the product A2.

In summary, in the molding die of the embodiment of the present utility model, the first insert 12 is configured to be capable of telescopic movement with respect to the first sleeve 11, and the plurality of first cylindrical surfaces 122 for forming the inner diameter of the lens barrel are provided on the core print 121, so that the core print 121 and the first sleeve 11 can be spliced with each other to form the molding surface 31. Therefore, on one hand, before the first sleeve 11 is separated from the second die body part 2, the core 121 can be firstly pulled out from the die cavity 3, so that the position accuracy of the inner diameter of the lens barrel is ensured. The condition that the precision of the product A2 is reduced when the first insert 12 and the first sleeve 11 are opened together is avoided. On the other hand, in the process of extracting the first insert 12, the first insert 12 can ensure that the linear motion precision of the first insert 12 is matched with the coaxiality and cylindricity of the first cylindrical surface 122 through the cooperation of the first insert 12 and the guide part 4, so that the condition that the inner diameter precision of the lens barrel is reduced due to die opening is further avoided. On the other hand, after the first insert 12 is drawn out, the first mold body portion 1 and the second mold body portion 2 are opened, so that the difficulty in opening the mold of the injection molded object a is reduced, and the injection molded object a after opening the mold can be kept on the second mold body portion 2.

Preferably, the guiding portion 4 may also serve as a guiding function when the first sleeve 11 is separated from the second mould body portion 2. That is, after the first insert 12 is extracted from the cavity 3, the movement of the first die holder 14 can be continuously guided by the guide post 41 during the moving process, so that the area of the first sleeve 11 forming the first molding surface 31 is ensured, and the first sleeve can also move along a straight line, thereby ensuring the manufacturing precision of the top area of the product A2.

In some embodiments, as shown in fig. 1-5, the mating member 42 is a needle bearing, and the outer diameter of the guide post 41 is adapted to the inner diameter of the needle bearing.

Specifically, the needle bearing is a non-inner ring bearing, that is, the needle is in direct rolling contact with the guide post 41, so as to ensure the linear motion precision of the guide post 41 in the up-down motion of the guide post 41.

In some embodiments, as shown in fig. 1-5, the first insert 12 has a drive head 123, the drive head 123 protruding from a side of the first channel 13 remote from the cavity 3, the drive head 123 having a first rotation stop surface 124 laterally and the first sleeve 11 having a second rotation stop surface 111 laterally. In contrast, the first die body portion 1 further includes a first die holder 14, a mounting hole 141 and a connecting hole 142 are formed in the first die holder 14, the first sleeve 11 is mounted in the mounting hole 141, the driving head 123 extends into the connecting hole 142, and the shapes of the mounting hole 141 and the connecting hole 142 are respectively matched with the second rotation stopping surface 111 and the first rotation stopping surface 124.

The first insert 12 is ensured to have the rectilinear motion accuracy by the guide 4 in the above embodiment. This embodiment further ensures that the first sleeve 11 and the first insert 12 do not rotate in the circumferential direction of the first cylindrical surface 122 during linear movement of the first body portion 1 by the first stop surface 124 and the second stop surface 111. The cylindricity of the first cylindrical surface 122 is ensured.

Specifically, one particular form of the attachment holes 142 and mounting holes 141 is shown in FIG. 2. The inner wall of the connecting hole 142 in the drawing has two planes. The inner wall of the mounting hole 141 has a flat surface. The engagement of the flat surfaces with the first rotation stop surface 124 and the second rotation stop surface 111 limits rotation of the first sleeve 11 and the first insert 12 in the circumferential direction.

In some embodiments, as shown in fig. 1-11, the first sleeve 11 includes a second post 15 and a positioning boss 16, the positioning boss 16 protruding toward the peripheral side of the second post 15, and the second rotation stop surface 111 being located on the sidewall of the positioning boss 16. The first die holder 14 further includes a first body 143 and a pressing plate 144, the first body 143 is provided with a mounting groove 145, the mounting hole 141 is a step hole, the step hole penetrates through the first body 143, the large diameter end of the step hole is communicated with the bottom of the mounting groove 145 and is adapted to the second rotation stopping surface 111, the small diameter end of the step hole is adapted to the second column surface 15, and the connecting hole 142 penetrates through the pressing plate 144. The pressing plate 144 is simultaneously pressed against the top surfaces of the positioning boss 16 and the pressing plate 144 in a state in which the positioning boss 16 is in abutment with the mesa of the stepped hole.

In this embodiment, the matching of the second cylindrical surface 15 with the small diameter end of the stepped hole can ensure the positional accuracy of the first sleeve 11 and the first insert 12 in the horizontal direction with respect to the second mold body portion 2. At the same time, the positioning boss 16 also ensures positional accuracy of the first sleeve 11 in the height direction with respect to the second mold body portion 2. When the first mold body portion 1 is assembled, the first insert 12 may be inserted into the first channel 13 first, and then the plurality of sets of the first sleeve 11 and the first insert 12 may be sequentially inserted into the stepped hole. Finally, the plurality of sets of first sleeve 11 and first insert 12 are secured together using the platen 144.

In some embodiments, as shown in fig. 1-11, the forming mold further includes a first drive plate 51 and a connecting rod 61. One end of the connecting rod 61 is connected to the driving head 123, and the other end is connected to the first driving plate 51. The guide post 41 has a connection end 411 remote from the first body portion 1, the connection end 411 being connected to the first drive plate 51.

Specifically, the connecting rod 61 is a connecting bolt, and a threaded end of the connecting bolt is screwed with the driving head 123 of the first insert 12. And a locknut 53 (shown in fig. 2) is provided at the connection position of the two. The head of the connecting bolt is connected to the first driving plate 51. Meanwhile, the connection end 411 of the guide post 41 is also connected to the first driving plate 51. Thereby, the guide post 41 and the first insert 12 can be moved synchronously by the first driving plate 51.

Further, the number of cavities 3 is plural and distributed around the center of the molding die. The number of the connecting rods 61 is plural and is connected with the first external members 11 of the plural cavities 3 in one-to-one correspondence. In this embodiment, the same first driving plate 51 may be used to drive the plurality of first inserts 12 to move synchronously, so as to improve the injection efficiency of the forming mold. The consistency of the performance between the products A2 is ensured.

In some embodiments, as shown in fig. 1-5, the forming mold further includes a core print extraction 7. The core extracting portion 7 includes a belleville spring set 71 and a driving member 72, the driving member 72 includes a rod 721 and a pushing boss 722, and the rod 721 is disposed through the belleville spring set 71 and connected to the pushing boss 722. The core drawing portion 7 is located between the first drive plate 51 and the first die holder 14, and the elastic force of the belleville spring group 71 acts on both the first drive plate 51 and the first die holder 14. Meanwhile, the core print 121 forms part of the first molding surface 31 in a compressed state of the belleville spring group 71. In contrast, the belleville spring group 71 is in the released state, and the core 121 moves away from the cavity 3. Wherein, the compression of belleville spring group is less than 0.5mm.

A particular form of the core print extraction 7 is shown in figure 5. The first driving plate 51 in the figure is further provided with a first accommodating groove for accommodating the pushing boss 722, the first body 143 is provided with a second accommodating groove for accommodating the rod 721 and the belleville spring set 71, and the first accommodating groove and the second accommodating groove are correspondingly arranged. In the present embodiment, when the first molding surface 31 and the second molding surface 32 are in a closed state, the first driving plate 51 is pressed against the first body 143, and in this state, the belleville spring group 71 is compressed. When the external device releases the restraint on the first driving plate 51, the belleville spring group 71 can lift up the first driving plate 51 by its own elastic force, and in this form, the first insert 12 and the guide post 41 are lifted up together. L1 and L2 shown in the two enlarged views are the moving distances of the driver 72 and the first insert 12, respectively (the lengths of L1 and L2 are the same).

The present embodiment also configures the movement stroke of the driving member 72 so as not to be excessively large, so as to reduce the variation in positional accuracy with respect to the inner diameter of the lens barrel in the process of moving the first cylindrical surface 122 away from the cavity 3. Avoiding the influence on the inner diameter precision of the lens barrel due to the extraction action of the core 121.

Preferably, one skilled in the art can vary the travel of the driver 72 by varying the number of belleville springs in the belleville spring stack 71. The number of belleville springs may be increased, for example, when it is desired to increase the travel of the drive member 72.

In some embodiments, as shown in fig. 1-10, the first mold body portion 1 is provided with a main runner 83, and the number of cavities 3 is plural and uniformly distributed around the main runner 83. The first die body part 1 is provided with a plurality of first diversion trenches 81, and the second die body part 2 is provided with second diversion trenches 82 which are in one-to-one correspondence with the plurality of first diversion trenches 81. The first mold body part 1 and the second mold body part 2 are in a closed state, a plurality of first diversion trenches 81 and a plurality of second diversion trenches 82 are closed to form a plurality of sub-runners 84, one end of each sub-runner 84 is communicated with each cavity 3, and the other end is communicated with a main runner 83.

The second diversion trench 82 in fig. 7 is opened on the sprue bush 54 and the first body 143 at the same time, and the main runner 83 is located on the sprue bush 54. The second flow guide 82 may be formed together when the sprue bush 54 is installed with the first mold body portion 1. In this embodiment, the resin in a molten state is introduced into the cavity 3 through the main runner 83 and the plurality of sub runners 84. The 4 dashed lines in fig. 9 illustrate 4 gates in communication with the second molding surface 32. The resin in the runner 84 flows into the cavity 3 through the gate. The skeleton A1 shown in fig. 12 is resin located in the main runner 83 and the branch runner 84 after mold opening.

In some embodiments, as shown in fig. 1 to 10, the second mold body portion 2 is provided with a plurality of through holes 21, and the plurality of through holes 21 are respectively connected to the cavity 3, a position of the second diversion trench 82 near the cavity 3, and a communication position of the second diversion trench 82 and the main runner 83. The forming die further includes an ejector 22. The ejector 22 includes a second driving plate 221 and a plurality of ejector rods 222 corresponding to the plurality of through holes 21 one by one, and one end of each ejector rod 222 is fixedly connected to the second driving plate 221. The second driving plate 221 is configured to be fixedly connected with the ejector rod 222 and drive the ejector rod 222 to extend out of the through hole 21.

After the first sleeve 11 is separated from the second mold body 2, the injection molded object a is lifted from the second mold body 2 by the ejector rods 222 according to the present embodiment, so that an operator can take the injection molded object a off the second mold body 2. Fig. 6 shows the various states of ejector rod 222 in bold lines. Wherein, the ejector rod 222 positioned below is in an un-ejected state, and the ejector rods 222 positioned in the middle and upper left are in an ejected state.

Meanwhile, in this embodiment, the ejector pins 222 are configured to be located at the positions of the cavity 3 and the second diversion trench 82 near the cavity 3 and the communication position between the second diversion trench 82 and the main runner 83, respectively. The three positions correspond to the areas i, ii and iii on the injection-molded object a in fig. 12, respectively. That is, the ejector rod 222 applies ejector forces to a plurality of positions of the injection molded object a at the same time, so that the force applied to the injection molded object a is more uniform, and the integrity of the injection molded object a is ensured.

In some embodiments, as shown in fig. 1-11, the second mold body portion 2 includes a pair of second sleeve 23 and second insert 24. The second sleeve 23 is provided with a second channel 231, the second insert 24 is detachably disposed in the second channel 231, and the core 121 is abutted against the end surface of the second insert 24 when the second molding surface 32 and the first molding surface 31 are in an abutting state.

Specifically, the second mold body portion 2 is provided with a stepped hole similar to the first body 143. As shown in fig. 11, when the second insert 24 is installed in the second sleeve 23, the tails of the two are in a flush condition. Thus, the base 52 can be abutted against the bottoms of the second insert 24 and the second sleeve 23, so that the second insert and the second sleeve 23 can be stably mounted in the stepped hole of the second mold body 2, thereby ensuring the precision of the formed second molding surface 32.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A molding die, characterized in that the molding die comprises:

a first mold body part (1) having a first molding surface (31);

a second mold body part (2) having a second molding surface (32), wherein the second molding surface (32) moves linearly relative to the first molding surface (31) and is combined to form a cavity (3);

the first die body part (1) comprises a pair of first sleeve parts (11) and first inserts (12), the first sleeve parts (11) are provided with first channels (13), the first inserts (12) comprise core heads (121), the core heads (121) can move linearly along the first channels (13), the core heads (121) extend out of the first channels (13) and are spliced with the end faces, facing the second forming surfaces (32), of the first sleeve parts (11) to form the first forming surfaces (31), the core heads (121) are provided with a plurality of first cylindrical surfaces (122), the plurality of first cylindrical surfaces (122) are arranged in the moving direction of the core heads (121) and are close to the first cylindrical surfaces (122) of the second die body part (2), the diameters of the first cylindrical surfaces (122) of the die bodies far away from the second die part (2) are smaller than the diameters of the first cylindrical surfaces (122), and the coaxiality of the plurality of first cylindrical surfaces (122) is set in a preset range;

the first driving plate (51) is arranged above the first die body part (1);

and

the guide part (4) comprises a guide column (41) and a matching piece (42) sleeved on the guide column (41), the guide column (41) is connected with the first driving plate (51), the matching piece (42) is arranged on the first die body part (1), and the guide part (4) and the first insert (12) synchronously move.

2. The forming die according to claim 1, characterized in that the mating member (42) is a needle bearing, the outer diameter of the guide post (41) being adapted to the inner diameter of the needle bearing.

3. The forming die according to claim 1, wherein the first insert (12) has a driving head (123), the driving head (123) protruding from a side of the first channel (13) remote from the cavity (3), the driving head (123) having a first rotation-stopping surface (124) laterally, the first sleeve (11) having a second rotation-stopping surface (111) laterally,

the first mold body portion (1) further comprises:

the first die holder (14) is provided with a mounting hole (141) and a connecting hole (142), the first sleeve member (11) is mounted in the mounting hole (141), the driving head (123) stretches into the connecting hole (142), and the shapes of the mounting hole (141) and the connecting hole (142) are respectively matched with the second rotation stopping surface (111) and the first rotation stopping surface (124).

4. A forming die according to claim 3, wherein the first sleeve (11) includes a second cylindrical surface (15) and a positioning boss (16), the positioning boss (16) is convex toward a peripheral side of the second cylindrical surface (15), and the second rotation stopping surface (111) is located on a side wall of the positioning boss (16);

the first die holder (14) further comprises a first body (143) and a pressing plate (144), the first body (143) is provided with a mounting groove (145), the mounting hole (141) is a step hole, the step hole penetrates through the first body (143), the large diameter end of the step hole is communicated with the bottom of the mounting groove (145) and is adaptive to the second rotation stopping surface (111), the small diameter end of the step hole is adaptive to the second column surface (15), and the connecting hole (142) penetrates through the pressing plate (144);

the positioning boss (16) is in a state of abutting against the table top of the step hole, and the pressing plate (144) is pressed on the top surfaces of the positioning boss (16) and the pressing plate (144) at the same time.

5. A forming die as claimed in claim 3, further comprising:

a connecting rod (61) having one end connected to the driving head (123) and the other end connected to the first driving plate (51);

the guide post (41) has a connection end (411) remote from the first mould body (1), the connection end (411) being connected to the first drive plate (51).

6. The forming die according to claim 5, characterized in that the number of cavities (3) is plural and distributed around the center of the forming die;

the connecting rods (61) are multiple in number and are connected with the first external members (11) of the cavities (3) in a one-to-one correspondence mode.

7. The molding die of claim 5, further comprising:

the core head extraction part (7) comprises a belleville spring set (71) and a driving piece (72), wherein the driving piece (72) comprises a rod body (721) and a pushing boss (722), and the rod body (721) penetrates through the belleville spring set (71) and is connected with the pushing boss (722);

the core head extraction part (7) is positioned between the first driving plate (51) and the first die holder (14), and the elastic force of the belleville spring group (71) acts on the first driving plate (51) and the first die holder (14) simultaneously;

the belleville spring group (71) is in a compressed state, the core head (121) forms part of the first molding surface (31), the belleville spring group (71) is in a released state, and the core head (121) moves in a direction away from the cavity (3), wherein the compression amount of the belleville spring group is smaller than 0.5mm.

8. The forming die according to claim 1, wherein the first die body portion (1) is provided with a main runner (83), and the number of the cavities (3) is plural and uniformly distributed around the main runner (83);

the first die body part (1) is provided with a plurality of first diversion trenches (81), and the second die body part (2) is provided with second diversion trenches (82) which are in one-to-one correspondence with the plurality of first diversion trenches (81);

the first die body part (1) and the second die body part (2) are in an involution state, a plurality of first diversion trenches (81) and a plurality of second diversion trenches (82) are involuted to form a plurality of sub-runners (84), one end of each sub-runner (84) is communicated with each die cavity (3), and the other end of each sub-runner is communicated with the main runner (83).

9. The forming die according to claim 8, wherein the second die body portion (2) is provided with a plurality of through holes (21), and the plurality of through holes (21) are respectively communicated with the die cavity (3), a position of the second diversion trench (82) close to the die cavity (3) and a communication position of the second diversion trench (82) and the main runner (83);

the forming die further includes:

the ejection part (22) comprises a second driving plate (221) and a plurality of ejection rods (222) which are in one-to-one correspondence with the through holes (21), and one end of each ejection rod (222) is fixedly connected with the second driving plate (221);

the second driving plate (221) is fixedly connected with the ejector rod (222) and drives the ejector rod (222) to extend out of the through hole (21).

10. The forming die according to claim 1, characterized in that the second die body portion (2) comprises a pair of second sleeve (23) and second insert (24);

the second sleeve (23) is provided with a second channel (231), the second insert (24) is detachably arranged in the second channel (231), the second molding surface (32) and the first molding surface (31) are in a involution state, and the core head (121) is abutted to the end face of the second insert (24).