CN214000633U

CN214000633U - Box-shaped frame section composite part RTM forming tool core mold

Info

Publication number: CN214000633U
Application number: CN202022237111.8U
Authority: CN
Inventors: 周凯; 彭忠明; 王翠; 刘扬珍; 程卫琴; 徐志勇; 刘拥军
Original assignee: Jiangxi Hongdu Aviation Industry Group Co Ltd
Current assignee: Jiangxi Hongdu Aviation Industry Group Co Ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-08-20
Anticipated expiration: 2030-10-10

Abstract

The utility model relates to a box frame section combined material part forming die, especially adopt the box frame section combined material part forming die of RTM forming process belongs to the frock design field of resin transfer molding process (RTM). A box-shaped frame section composite material part RTM forming tool core mold comprises an outer core mold and an inner core mold, wherein the outer core mold comprises a plurality of blocks, and a positioning boss used for being connected with the inner core mold is arranged on the outer core mold; the inner core mold comprises a plurality of blocks, a groove and a glue flowing groove are formed in the inner core mold, the groove corresponds to and is matched with the positioning boss, and the glue flowing groove is used as an inlet for injecting glue; and a draft angle is arranged on the parting surface of the outer core mould and the inner core mould. The utility model has the advantages of as follows: 1. the efficiency is improved; 2. the core moulds are positioned by adopting a positioning boss and a pattern drawing angle, so that the mould closing gap between the tool parts is ensured; 3. the manufactured part can be formed in one step, secondary finishing is not needed, the cost is reduced, the manufacturing period is shortened, and the precision and the strength of the part are improved.

Description

Box-shaped frame section composite part RTM forming tool core mold

Technical Field

The utility model relates to a box frame section combined material part forming die, especially adopt the box frame section combined material part forming die of RTM forming process belongs to the frock design field of resin transfer molding process (RTM).

Background

RTM (resin Transfer molding) is a short term for resin Transfer molding and refers to a process technique in which a low-viscosity resin flows in a closed mold, infiltrates a reinforcing material, and is cured and formed. One of the advantages of the RTM process is that it is possible to produce parts close to those without margins, so that the amount of work required for cutting and trimming the parts can be greatly reduced, and the secondary trimming cost can be reduced. The secondary finishing cost of the box-shaped frame section composite material part is reduced through the design of a core mold in the RTM forming tool, and the secondary finishing cost is comprehensively considered through the difficulty degree, the weight, the precision, the mold closing gap, the arrangement of a glue flowing groove, the arrangement of a mold splitting surface, the convenience of operation (namely the cleaning, mold filling, mold opening and demolding of the tool are simple and easy) and the like of the core mold. The existing design method for designing the excircle corner of the box-shaped frame section composite material part by using the RTM forming tool is to design a core mould by adopting a straight edge without considering the fillet, so that although the complexity of the tool design is reduced, the secondary finishing cost of the part is increased, the risk of damage during finishing is increased, the manufacturing period is prolonged, and the precision and the strength are influenced.

Disclosure of Invention

The utility model aims at solving the problem that exists among the prior art, provide one kind and reduced its secondary and maintained the cost, make the box section frame combined material part RTM shaping frock mandrel that the part can one shot forming.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a box-shaped frame section composite material part RTM forming tool core mold comprises an outer core mold and an inner core mold, wherein the outer core mold comprises a plurality of blocks, and a positioning boss used for being connected with the inner core mold is arranged on the outer core mold; the inner core mold comprises a plurality of blocks, a groove and a glue flowing groove are formed in the inner core mold, the groove corresponds to and is matched with the positioning boss, and the glue flowing groove is used as an inlet for injecting glue; and a draft angle is arranged on the parting surface of the outer core mould and the inner core mould.

Preferably, the number of the positioning bosses corresponds to the parting surfaces among the inner core module sub-blocks.

Preferably, the positioning boss has a width of 30mm and a height of 10 mm.

Preferably, the draft angle of the positioning boss is 5-15 degrees.

Preferably, the draft angle on the parting plane of the outer core mold and the inner core mold is 0.2-0.5 °.

Preferably, the parting plane between the outer core mold segments is provided at the non-peripheral fillet portion.

Preferably, the inner core mold is divided into 8 segments.

The principle is as follows: the outer core die and the inner core die are subjected to blocking treatment, and die parting surfaces are designed to avoid being arranged at peripheral round corners as much as possible so as to prevent the round corners from layering to form steps and prevent folds for paving fibers from influencing the precision and the internal strength of parts; the butt joint method of the outer core mold and the inner core mold adopts a positioning boss positioning mode, and a mold drawing angle is arranged on a mold splitting surface between the core molds to meet the requirements of mold filling, mold opening and mold closing gaps.

Compared with the prior art, the utility model has the advantages of as follows:

1. the die sinking and demoulding of the tool are simple and easy, the operation of production personnel is convenient, and the efficiency is improved;

2. the core moulds are positioned by adopting a positioning boss and a pattern drawing angle, so that the mould closing gap between the tool parts is ensured;

3. the manufactured part can be formed in one step, secondary finishing is not needed, the cost is reduced, the manufacturing period is shortened, and the precision and the strength of the part are improved.

Drawings

FIG. 1 is a block diagram of a box-shaped frame section according to an embodiment of the present invention;

FIG. 2 is a schematic view of the outer core module in the embodiment of the present invention;

FIG. 3 is a schematic view of the positioning boss and inner and outer core mold blocking manner in the embodiment of the present invention;

fig. 4 is a schematic view of the design scheme of the positioning boss and the parting surface in the embodiment of the present invention (wherein, 4 (a) is the positioning boss, and 4 (b) is the parting surface);

in FIG. 1, the periphery of the part is rounded; 2. a circle of excircle corner part at the bottom;

in fig. 2-4, 1, outer core mold a; 2. an outer core mold B; 3. an outer core mold C; 4. an outer core mold D; 5. parting surfaces; 6. an inner core mold A; 7. an inner core mold B; 8. an inner core mold C; 9. an inner core mold D; 10. an inner core mold E; 11. an inner core mold F; 12. an inner core mold G; 13. an inner core mold H; 1201. a glue flowing groove; 101. and (5) positioning the boss.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings 1-4: a box-shaped frame section composite part RTM forming tool core mold comprises an outer core mold and an inner core mold, as shown in figure 1, according to the characteristics of the box-shaped frame section composite part, the characteristics of the profiles of the outer core mold and the inner core mold are reasonably partitioned to form mold splitting surfaces; as shown in fig. 2, the outer core mold is blocked: the outer core die comprises an outer core die A1, an outer core die B2, an outer core die C3, an outer core die D4 and a die parting surface 5, wherein the number of the outer core dies C3 is two, and the two outer core dies C3 are symmetrical, so that the die parting surfaces are designed to be avoided from being arranged at peripheral fillet parts (such as a peripheral fillet 1 and a circle of outer fillet part 2 at the bottom of the part in figure 1) as far as possible according to the characteristic of the outer fillet of the part in the design of the outer core die, and are used for preventing the fillets from layering to form steps and the wrinkles of laid fibers from influencing the precision and the internal strength of the part; as shown in fig. 3, the inner core mold continues to be subjected to the blocking process: the mold comprises an inner core mold A6, an inner core mold B7, an inner core mold C8, an inner core mold D9, an inner core mold E10, an inner core mold F11, an inner core mold G12, an inner core mold H13 and a glue flowing groove 1201, wherein a positioning boss 101 used for connecting the inner core mold is designed at each outer core mold reasonable position, and a groove designed on the inner core mold is in butt joint fit with the positioning boss designed on the outer core mold to ensure a mold closing gap; the design of the positioning boss 101 ensures the die closing clearance of the parts and the smooth die closing and opening. As can be seen in fig. 2, the outer core form is divided into 5 sections, two of which are symmetrical pieces, denoted as outer core form C3; as can be seen from fig. 3 to 4, the inner core mold is divided into 8 parts, the glue flowing groove 1201 is arranged on the inner core mold G12, in order to ensure the smoothness of glue injection, the inner core mold G12 is not continuously divided, and finally, a reasonable draft angle is designed on the combined mold surface of the outer core mold and the inner core mold, so that the tooling mold assembly and mold opening are simple and easy to implement, and the mold closing gap is ensured, as shown in fig. 4, the draft angle of the split mold surface between the core molds is generally designed to be 0.2 to 0.5 degrees, the butt joint method of the outer core mold and the inner core mold adopts a positioning boss for positioning, the size of the positioning boss is generally designed to be length (as required) x 30 (width) x 10 (height) mm, and the draft angle is generally designed to be 5 to 15 degrees.

When the mold is installed, the outer core mold is installed, and then the inner core mold is closed according to the designed positioning boss 101; when the die is opened, the outer core die is taken out firstly, and then the inner core die is taken out in sequence, so that the die opening and closing process of the tool is smooth and convenient to operate. Meanwhile, the secondary finishing cost of the parts is reduced, the manufacturing period of the parts is shortened, the precision and the strength of the parts are improved, the die closing gap between the parts is ensured, the operation is more convenient, and the parts close to no allowance are produced.

Claims

1. The utility model provides a box frame section combined material part RTM shaping frock mandrel which characterized in that: the outer core die comprises a plurality of blocks, and a positioning boss used for connecting the inner core die is arranged on the outer core die; the inner core mold comprises a plurality of blocks, a groove and a glue flowing groove are formed in the inner core mold, the groove corresponds to and is matched with the positioning boss, and the glue flowing groove is used as an inlet for injecting glue; and a draft angle is arranged on the parting surface of the outer core mould and the inner core mould.

2. The RTM forming tool core mold for box-shaped frame section composite parts according to claim 1, characterized in that: the positioning bosses are provided with a plurality of positioning bosses, and correspond to the parting surfaces among the inner core module sub-blocks.

3. The RTM forming tool core mold for box-shaped frame section composite parts according to claim 1, characterized in that: the width of location boss is 30mm, and the height is 10 mm.

4. The RTM forming tool core mold for box-shaped frame section composite parts according to claim 1, characterized in that: the draft angle of location boss is 5~ 15.

5. The RTM forming tool core mold for box-shaped frame section composite parts according to claim 1, characterized in that: the draft angle on the parting surface of the outer core mold and the inner core mold is 0.2-0.5 degrees.

6. The RTM forming tool core mold for box-shaped frame section composite parts according to claim 1, characterized in that: the parting surface between the outer core mold parts is arranged at the non-peripheral round corner part.

7. The RTM forming tool core mold for box-shaped frame section composite parts according to claim 1, characterized in that: the inner core mold is divided into 8 blocks.