CN114670476A - Compression molding method for slender tubular composite part - Google Patents
Compression molding method for slender tubular composite part Download PDFInfo
- Publication number
- CN114670476A CN114670476A CN202210368214.9A CN202210368214A CN114670476A CN 114670476 A CN114670476 A CN 114670476A CN 202210368214 A CN202210368214 A CN 202210368214A CN 114670476 A CN114670476 A CN 114670476A
- Authority
- CN
- China
- Prior art keywords
- metal shell
- tubular metal
- pressing
- compression molding
- tubular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000748 compression moulding Methods 0.000 title claims abstract description 25
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 35
- 238000003825 pressing Methods 0.000 claims abstract description 29
- 239000000047 product Substances 0.000 claims abstract description 12
- 239000011265 semifinished product Substances 0.000 claims abstract description 8
- 238000007723 die pressing method Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a compression molding method of a slender tubular composite part, which comprises the steps of firstly processing a tubular metal shell; then, a group of cylindrical pre-pressing pieces with the same size are pressed in a segmented mode through a die pressing process, and the pressing density of each pre-pressing piece is 75% -80% of the density of a finished product; then vertically placing the tubular metal shell into a pressing die, placing all prepressed parts into the tubular metal shell, and compacting the prepressed parts in the inner cavity of the tubular metal shell to obtain a solid semi-finished product compression molding part; and finally, drilling the inner cavity of the semi-finished product compression molding piece in the axial direction to ensure that the wall thickness in the tubular metal shell meets the design size of the product, thereby obtaining the elongated tubular composite part. The compression molding method realizes compression molding of the slender tubular composite part with a larger major diameter.
Description
Technical Field
The invention relates to a compression molding method of a slender tubular composite part, belonging to the technical field of compression molding of composite parts.
Background
The conventional thermosetting plastic is formed by adopting the modes of mold preheating, charging, temperature rising curing and mold unloading, and for some slender parts with larger long diameters, the filling of the mold is difficult to realize by one-time charging, the defects of looseness, material shortage and the like are easy to occur to pressed products, and the yield of the products is low.
As shown in figure 1, the outer layer of a slender tubular composite part is a tubular metal shell, and the inner layer of the slender tubular composite part is 4330-3J phenolic glass fiber molding material pressed on the inner wall of the tubular metal shell. The length of the part is 95mm, the diameter is 20mm, the length-diameter ratio is about 5, the traditional compression molding method cannot reliably realize one-time compression molding of the slender tubular composite part, and the yield is extremely low, so that the processing method of the part needs to be redesigned.
Disclosure of Invention
The invention aims to solve the problem that the traditional compression molding method cannot reliably realize compression molding of a long and thin tubular composite part with a larger long diameter, and provides a compression molding method of the long and thin tubular composite part.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a compression molding method of a slender tubular composite part, which comprises the following specific processing steps:
1) processing a tubular metal shell;
2) a group of cylindrical pre-pressing pieces with the same size are pressed in a sectional mode through a die pressing process, the pressing density of each pre-pressing piece is 75% -80% of the density of a finished product, the length of each pre-pressing piece is 1.5-3 times of the inner diameter of the tubular metal shell, the diameter of each pre-pressing piece is 1-2 mm smaller than the inner diameter of the tubular metal shell, and the number of the pre-pressing pieces is N/(1.5-3) d; wherein L is the length of the tubular metal shell, d is the inner diameter of the tubular metal shell, and N is a rounded positive integer;
3) vertically placing the tubular metal shell into a pressing die, placing all prepressed parts into the tubular metal shell, and pressing the prepressed parts into an inner cavity of the tubular metal shell to obtain a solid semi-finished product compression molding part;
4) and drilling the inner cavity of the semi-finished product compression molding piece in the axial direction to ensure that the wall thickness in the tubular metal shell meets the design size of the product, thereby obtaining the elongated tubular composite part.
In order to increase the binding force between the tubular metal shell and the mould pressing material, in the step 1), a plastic part positioning hole is formed in the side wall of the middle part of the tubular metal shell.
Has the advantages that:
the compression molding method provided by the invention is simple and feasible, has a short processing period, compact and uniform workpieces and good quality of molded products, and realizes compression molding of long and thin tubular composite parts with large long diameters.
Drawings
FIG. 1 is a block diagram of an elongate tubular composite part;
FIG. 2 is a diagram showing the structure of a semi-finished compression molded article obtained in step 3) of the example;
Detailed Description
The invention is further described with reference to the following figures and examples.
Examples
Taking the processing of an elongated tubular composite part as an example, the structure of which is shown in fig. 1, the elongated tubular composite part has a length of 95mm and a diameter of 20mm, and the specific processing steps are as follows:
1) processing a tubular metal shell, and forming a plastic part positioning hole in the side wall of the middle part of the metal shell;
2) the method comprises the following steps of pressing a group of cylindrical pre-pressing parts with the same size in a segmented mode by adopting a die pressing process, wherein the pressing density of each pre-pressing part is 75% of the density of a finished product, the length of each pre-pressing part is 40mm, the diameter of each pre-pressing part is 19mm, and the number of the pre-pressing parts is N95/1.5/20; n is a rounded positive integer of 3;
3) vertically placing the tubular metal shell into a pressing die, placing all prepressed parts into the tubular metal shell, and pressing the prepressed parts into an inner cavity of the tubular metal shell to obtain a solid semi-finished product compression molding part, as shown in fig. 2;
4) and drilling the inner cavity of the semi-finished product compression molding piece in the axial direction to ensure that the wall thickness in the tubular metal shell meets the design size of the product, thereby obtaining the elongated tubular composite part.
After the elongated tubular composite part obtained in the embodiment is subjected to sectioning verification, the workpiece is dense, uniform and consistent. The density detection result is (1.80-1.82) g/cm3The density of the conventional product is more than or equal to 1.72g/cm3The requirements of (1).
Claims (2)
1. A compression molding method of a slender tubular composite part is characterized by comprising the following specific processing steps:
1) processing a tubular metal shell;
2) a group of cylindrical pre-pressing pieces with the same size are pressed in a sectional mode through a die pressing process, the pressing density of each pre-pressing piece is 75% -80% of the density of a finished product, the length of each pre-pressing piece is 1.5-3 times of the inner diameter of the tubular metal shell, the diameter of each pre-pressing piece is smaller than the inner diameter of the tubular metal shell by 1-2 mm, and the number of the pre-pressing pieces is equal to that of the tubular metal shell
N is L/(1.5-3) d; wherein L is the length of the tubular metal shell, d is the inner diameter of the tubular metal shell, and N is a rounded positive integer;
3) vertically placing the tubular metal shell into a pressing mold, placing all prepressed parts into the tubular metal shell, and compacting the prepressed parts in an inner cavity of the tubular metal shell to obtain a solid semi-finished product compression molding part;
4) and drilling the inner cavity of the semi-finished product compression molding piece in the axial direction to ensure that the wall thickness in the tubular metal shell meets the design size of the product, thereby obtaining the elongated tubular composite part.
2. A method of compression moulding an elongate tubular composite part as claimed in claim 1, wherein: in the step 1), a plastic part positioning hole is formed in the side wall of the middle part of the tubular metal shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210368214.9A CN114670476A (en) | 2022-03-30 | 2022-03-30 | Compression molding method for slender tubular composite part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210368214.9A CN114670476A (en) | 2022-03-30 | 2022-03-30 | Compression molding method for slender tubular composite part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114670476A true CN114670476A (en) | 2022-06-28 |
Family
ID=82078150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210368214.9A Pending CN114670476A (en) | 2022-03-30 | 2022-03-30 | Compression molding method for slender tubular composite part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114670476A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB839459A (en) * | 1956-06-20 | 1960-06-29 | Dielektra Ag | Production of laminated bodies |
| GB1269569A (en) * | 1968-08-02 | 1972-04-06 | Staedtler J S | Tubular writing point for recording and drawing instruments, and a method for making the same |
| DE102005033188A1 (en) * | 2005-07-13 | 2007-01-18 | Aberle Gmbh & Co. | Method for production of hollow cylinder precision metal parts with external teeth useful in vehicle production, e.g. steering wheel spindles production of a rough part by cutting the bar material to the required length |
| CN207643537U (en) * | 2017-12-14 | 2018-07-24 | 晋西工业集团有限责任公司 | A kind of plastic inner lining and the close-connected jet pipe of metal shell |
| CN108644490A (en) * | 2018-07-09 | 2018-10-12 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube and its mould pressing process |
| CN215703446U (en) * | 2021-07-30 | 2022-02-01 | 晋西工业集团有限责任公司 | Nonmetal material pre-compaction forming device |
-
2022
- 2022-03-30 CN CN202210368214.9A patent/CN114670476A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB839459A (en) * | 1956-06-20 | 1960-06-29 | Dielektra Ag | Production of laminated bodies |
| GB1269569A (en) * | 1968-08-02 | 1972-04-06 | Staedtler J S | Tubular writing point for recording and drawing instruments, and a method for making the same |
| DE102005033188A1 (en) * | 2005-07-13 | 2007-01-18 | Aberle Gmbh & Co. | Method for production of hollow cylinder precision metal parts with external teeth useful in vehicle production, e.g. steering wheel spindles production of a rough part by cutting the bar material to the required length |
| CN207643537U (en) * | 2017-12-14 | 2018-07-24 | 晋西工业集团有限责任公司 | A kind of plastic inner lining and the close-connected jet pipe of metal shell |
| CN108644490A (en) * | 2018-07-09 | 2018-10-12 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube and its mould pressing process |
| CN215703446U (en) * | 2021-07-30 | 2022-02-01 | 晋西工业集团有限责任公司 | Nonmetal material pre-compaction forming device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201645646U (en) | Cold isostatic pressing forming mould for preparing Na-beta-Al2O3 ceramic tube with one end closed | |
| CN114670476A (en) | Compression molding method for slender tubular composite part | |
| CN202428529U (en) | Isostatic-pressing forming mold for manufacturing ceramic tube shell | |
| CN103480840B (en) | Cylindrical component powder metallurgy forming mold | |
| CN215144694U (en) | Pressing die for cylindrical pressed compact | |
| CN208558355U (en) | A kind of Wrapping formed mold of ship sealing stationary ring and hot-press solidifying molding die | |
| CN208800783U (en) | A kind of powder metallurgy die of special-shaped axis bearing sleeve | |
| CN218134956U (en) | High-precision powder metallurgy gear die | |
| CN207682759U (en) | A kind of immersion type casting device of micro conductive retractor collar ring body component | |
| CN216099959U (en) | Reinforced cylinder winding forming tool | |
| CN107313651A (en) | Embedded weight increasing type lock handle and its manufacture method | |
| CN110027094B (en) | Ferrite magnetic ring radial wet pressing die | |
| CN208604039U (en) | A kind of low degree of eccentricity abnormity powder column spiral shell molding die | |
| CN214920481U (en) | Thin-wall pipe blank forming die | |
| CN206393959U (en) | A kind of double top board structures of mould | |
| CN218964032U (en) | Powder compacting die | |
| CN111112605A (en) | Powder magnetic field forming method of rare earth permanent magnet | |
| CN219486331U (en) | Lengthening die for die-pressing flanging of steel lining tetrafluoro pipe fitting | |
| CN207044765U (en) | A kind of step deflation casement | |
| CN110756799A (en) | Foamed aluminum foaming precursor mould pressing preparation facilities | |
| CN219074364U (en) | A mould for powder compact | |
| CN215151413U (en) | Injection mold of special filter sealing ring for additive manufacturing equipment | |
| CN212917295U (en) | MIM metal piece shaping jig | |
| CN218310849U (en) | Forming die of double-sided tooth | |
| CN214392342U (en) | Extrusion die structure of powder metallurgy surface densification part |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220628 |
|
| WD01 | Invention patent application deemed withdrawn after publication |