CN115319094A

CN115319094A - Binder for powder titanium alloy injection molding

Info

Publication number: CN115319094A
Application number: CN202210809881.6A
Authority: CN
Inventors: 左师昌
Original assignee: Shenzhen Ailijia Material Technology Co Ltd
Current assignee: Shenzhen Ailijia Material Technology Co Ltd
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2022-11-11

Abstract

The invention relates to the technical field of binders, in particular to a binder for powder titanium alloy injection molding. The technical scheme is that the method mainly aims at the problems that the existing binder preparation equipment is low in processing efficiency and cannot efficiently and quickly obtain a binder with uniformly dispersed raw materials, and comprises the following steps: the binder is prepared from the following raw materials in parts by mass: 20-35 parts of polypropylene, 60-75 parts of low-density polyethylene, 12-18 parts of paraffin, 0.8-1.2 parts of stearic acid, 7-9 parts of naphthalene and 1.5-2.5 parts of TPR elastomer. The binder has high performance and fluidity, is beneficial to improving the surface uniformity of titanium alloy products and reducing the rejection rate, has various functions of binder reaction equipment, high mixing efficiency and less input time, and is mainly applied to the preparation of the binder for injection molding.

Description

Binder for powder titanium alloy injection molding

Technical Field

The invention relates to the technical field of binders, in particular to a binder for powder titanium alloy injection molding.

Background

Titanium and alloy have high mass specific strength and rigidity, good temperature resistance and corrosion resistance, but high metallurgical cost and poor deformation and cutting characteristics, so that the manufacturing cost of materials and parts is high, and the wide application of the materials and the parts is influenced. The powder injection molding technique can realize flexible material synthesis and low-cost near-net-shape scale manufacturing of parts. In the feeding composition of powder injection molding, the types and the compositions of the binding agents directly influence the processes of banburying, molding, degreasing and the like, thereby influencing the density, the microstructure, the dimensional precision, the mechanical property and the like of a sintered product. Therefore, the preparation and addition of the binder are key core technologies for the preparation of the powder injection molding feedstock. The binder for metal powder injection molding provided by the patent CN106493369B has the advantages that the sintering shrinkage rate of the material can be effectively controlled, and the rejection rate of products is reduced; but in this case, it is prepared by mixing with a general stirring apparatus.

The existing mixing equipment does not have the effect of full dispersion, and long-time mixing processing is needed if uniform binder is prepared, so that the preparation period of the binder is long, the efficiency is low, and the energy consumption is increased. In view of this, we propose a binder for injection molding of powdered titanium alloys.

Disclosure of Invention

The invention aims to provide a binder for powder titanium alloy injection molding, aiming at the problems that the existing binder preparation equipment in the background technology has low processing efficiency and can not efficiently and quickly obtain a binder with uniformly dispersed raw materials.

The technical scheme of the invention is as follows: the binder for injection molding of the powder titanium alloy comprises the following raw materials in parts by mass: 20-35 parts of polypropylene, 60-75 parts of low-density polyethylene, 12-18 parts of paraffin, 0.8-1.2 parts of stearic acid, 7-9 parts of naphthalene and 1.5-2.5 parts of TPR elastomer;

the raw materials in parts by mass are processed by reaction equipment and are granulated by a granulator to form binder particles;

the reaction equipment comprises an outer barrel, a middle barrel which is as high as the outer barrel is installed in the outer barrel, a cylindrical inner barrel is arranged in the middle barrel, a rotating shaft is fixedly connected to the bottom of the inner barrel, one end, penetrating through the outer barrel, of the rotating shaft is connected with a motor, the motor is connected with a bottom bolt of the outer barrel, a material distribution barrel with the inner diameter smaller than that of the inner barrel is installed in the inner barrel, a plurality of material distribution pipes II penetrating through the inner barrel are installed on an outer ring array of the material distribution barrel, a plurality of material distribution pipes I are arranged on an outer ring of the material distribution pipes I, and a detachable filter screen is connected to one end, in each material distribution pipe, of the material distribution pipes I.

Preferably, the binder consists of the following raw materials in parts by mass: 20 parts of polypropylene, 60 parts of low-density polyethylene, 12 parts of paraffin, 0.8 part of stearic acid, 7 parts of naphthalene and 1.5 parts of TPR elastomer.

Preferably, the binder consists of the following raw materials in parts by mass: 35 parts of polypropylene, 75 parts of low-density polyethylene, 18 parts of paraffin, 1.2 parts of stearic acid, 9 parts of naphthalene and 2.5 parts of TPR elastomer.

Preferably, the binder consists of the following raw materials in parts by mass: 30 parts of polypropylene, 70 parts of low-density polyethylene, 15 parts of paraffin, 1 part of stearic acid, 8 parts of naphthalene and 2 parts of TPR elastomer.

Preferably, a plurality of supporting legs are installed to the bottom of urceolus, the top movable mounting of well section of thick bamboo has the upper cover, "L" type handle is installed at the top of upper cover, the outer wall connection of urceolus has the link that is used for matcing the installation with the handle, one side of upper cover is connected with the sealing washer, the outer lane of sealing washer and the inner wall adaptation sealing connection of well section of thick bamboo.

Preferably, be equipped with the cavity between well section of thick bamboo and the urceolus, the hot plate is installed to the bottom inner wall of cavity, the input control end of hot plate has the power link through wire electric connection, the power link is installed in the bottom outer wall of urceolus, the discharging pipe is installed to the bottom of well section of thick bamboo, install control valve body on the discharging pipe.

Preferably, a liquid inlet pipe is installed on the outer wall of the outer barrel, a liquid outlet pipe installed on the outer barrel is arranged below the liquid inlet pipe, and control valve bodies are installed on the liquid inlet pipe and the liquid outlet pipe.

Preferably, a plurality of connecting rods are installed in the outer ring array of pivot, the one end of connecting rod is connected with the stirring board, the one side that the connecting rod was kept away from to the stirring board contacts with the inner wall of well section of thick bamboo, a plurality of hourglass material holes have been seted up on the stirring board.

Preferably, the first discharging pipe is located above the second discharging pipe, one side of the filter screen is connected with a connecting pipe, a clamping block is connected to the connecting pipe, the connecting pipe is matched with the inner wall of the first discharging pipe, and the clamping block is a high-elasticity rigid plastic body.

Compared with the prior art, the invention has the following beneficial technical effects:

1. according to the invention, through optimizing the components and the proportion of the binder, the melt fluidity of the binder is improved, so that the density distribution of the powder titanium alloy is improved, the uniformity of the surface of a titanium alloy molded product is improved, the defects of flow lines, corner material shortage and the like are avoided, the rejection rate of the titanium alloy molded product is reduced, the components of the binder raw materials are simple and easy to obtain, and the preparation cost is low;

2. the invention combines the use of reaction equipment, the reaction equipment in the scheme has the functions of heating and heat preservation through the arrangement of the heating plate, and the proper temperature is controlled for processing, so that the full reaction and mixing among the components are facilitated, and the preparation efficiency of the binder is improved;

3. the material mixing device has the functions of dispersing and discharging materials, different raw materials are conveyed to the middle cylinder from different paths and mixed through the arrangement of the first discharging pipe and the second discharging pipe, the raw materials are conveyed in a rotating mode through the rotating action of the rotating shaft, the dispersion is more uniform, the material mixing time is reduced, and the material mixing efficiency is improved;

4. in conclusion, the binder disclosed by the invention has the advantages of high performance, high fluidity, capability of improving the surface uniformity of a titanium alloy product and reducing the rejection rate, and the binder has various functions of reaction equipment, high mixing efficiency and less input time.

Drawings

FIG. 1 is a front view of a reaction apparatus for a binder;

FIG. 2 is a schematic view showing an opened state of the upper cover of FIG. 1;

FIG. 3 is a schematic structural view of the cartridge of FIG. 2;

FIG. 4 is a schematic view of the motor of FIG. 3;

FIG. 5 is a cross-sectional schematic view of the inner barrel of FIG. 4;

fig. 6 is a schematic view of the filter screen structure of fig. 5.

Reference numerals are as follows:

1. an outer cylinder; 11. hanging a ring; 12. a liquid inlet pipe; 13. a liquid outlet pipe; 14. a power supply connection end; 15. heating plates;

2. a middle cylinder; 21. a discharge pipe; 22. an upper cover; 23. a handle; 24. a seal ring;

3. an inner barrel; 31. a feeding pipe I; 32. a filter screen; 321. a connecting pipe; 322. a clamping block; 33. a rotating shaft; 34. a motor; 35. a connecting rod; 36. stirring the plate;

4. a material separating barrel; 41. and a second discharging pipe.

Detailed Description

The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.

Example one

As shown in figures 1-6, the binder for injection molding of the powder titanium alloy provided by the invention comprises the following raw materials in parts by mass: 20 parts of polypropylene, 60 parts of low-density polyethylene, 12 parts of paraffin, 0.8 part of stearic acid, 7 parts of naphthalene and 1.5 parts of TPR elastomer;

the raw materials in parts by mass are processed by reaction equipment and are granulated by a granulator to form binder particles.

Example two

As shown in fig. 1 to 6, the binder for injection molding of a powdered titanium alloy proposed by the present invention is composed of the following raw materials in parts by mass, compared to the first embodiment: 35 parts of polypropylene, 75 parts of low-density polyethylene, 18 parts of paraffin, 1.2 parts of stearic acid, 9 parts of naphthalene and 2.5 parts of TPR elastomer;

EXAMPLE III

As shown in fig. 1 to 6, compared with the first embodiment or the second embodiment, the binder for injection molding of a powder titanium alloy according to the present invention further comprises the following raw materials in parts by mass: 30 parts of polypropylene, 70 parts of low-density polyethylene, 15 parts of paraffin, 1 part of stearic acid, 8 parts of naphthalene and 2 parts of TPR elastomer;

the raw materials in parts by mass are processed by reaction equipment and granulated by a granulator to form binder particles.

The first, second and third examples were all prepared using the following reaction equipment:

the reaction equipment comprises an outer barrel 1, wherein a liquid inlet pipe 12 is arranged on the outer wall of the outer barrel 1, a liquid outlet pipe 13 arranged on the outer barrel 1 is arranged below the liquid inlet pipe 12, control valve bodies are arranged on the liquid inlet pipe 12 and the liquid outlet pipe 13 and used for controlling liquid inlet and liquid outlet of the liquid inlet pipe 12 or the liquid outlet pipe 13, a plurality of support legs are arranged at the bottom of the outer barrel 1, a middle barrel 2 which is as high as the outer barrel 1 is arranged in the outer barrel 1, a discharge pipe 21 is arranged at the bottom of the middle barrel 2, a control valve body is arranged on the discharge pipe 21 and used for controlling discharging of a mixed binder from the discharge pipe 21, an upper cover 22 is movably arranged at the top of the middle barrel 2, an L-shaped handle 23 is arranged at the top of the upper cover 22, a hanging ring 11 which is matched and arranged with the handle 23 is connected to the outer wall of the outer barrel 1, a sealing ring 24 is connected to one side of the upper cover 22, the outer ring of the sealing ring 24 is in fit and sealing connection with the inner wall of the middle barrel 2, and the upper cover 22 and the sealing ring 24 are arranged to cover the mixed material reaction to seal and keep the top of the mixed material;

a cavity is formed between the middle barrel 2 and the outer barrel 1, a heating plate 15 is installed on the inner wall of the bottom of the cavity, an input control end of the heating plate 15 is electrically connected with a power supply connecting end 14 through a wire, the power supply connecting end 14 is installed on the outer wall of the bottom of the outer barrel 1, and an input end of the power supply connecting end 14 is electrically connected with a power supply through a wire.

The inner cylinder 2 is internally provided with a cylindrical inner cylinder 3, the bottom of the inner cylinder 3 is fixedly connected with a rotating shaft 33, a plurality of connecting rods 35 are installed in an outer ring array of the rotating shaft 33, one end of each connecting rod 35 is connected with a stirring plate 36, one side of each stirring plate 36, far away from the connecting rod 35, is in contact with the inner wall of the middle cylinder 2, a plurality of material leaking holes are formed in the stirring plate 36, the stirring plate 36 has a collision effect with the inner wall of the middle cylinder 2 and is used for scraping materials adhered to the inner wall of the middle cylinder 2, the material leaking holes are more effectively distributed on the materials, one end, penetrating through the outer cylinder 1, of the rotating shaft 33 is connected with a motor 34, the motor 34 is connected with the bottom of the outer cylinder 1 through a bolt, a distribution cylinder 4 with an inner diameter smaller than the inner wall of the inner cylinder 3 is installed in the inner cylinder 3, a plurality of blanking pipes 41 penetrating through the inner cylinder 3 are installed in an outer ring array of the distribution cylinder 4, a plurality of blanking pipes one 31 are provided with a plurality of blanking pipes one 31, one end, the one of the one blanking pipe 31 is connected with a detachable filter screen 32, the one end of the one of the other blanking pipe is connected with a connecting pipe 321, one connecting pipe 322, and the inner pipe 322 is connected with a high-elasticity plastic connecting block 322, and connected with the inner wall of the inner pipe 322.

Referring to fig. 5 and 6, in this embodiment, whether the filter screen 32 is installed in the first feeding tube 31 is selected according to the particle size of the raw material, if the raw material is a particle, the filter screen 32 is not installed in the first feeding tube 31, and if the raw material is a liquid, the filter screen 32 is installed in the first feeding tube 31, which is used for filtering the liquid before processing to ensure the purity of the binder raw material, and when the filter screen 32 is installed in the first feeding tube 31, the fixture block 322 is pressed into the connecting tube 321, so that the connecting tube 321 corresponds to the inner diameter of the first feeding tube 31, and then the fixture block 322 is released and the filter screen 32 is pushed into the first feeding tube 31, so that the installation can be completed. The filter screen 32 in this embodiment does not need to be installed.

Referring to fig. 1-5, when a raw material mixing reaction processing of an adhesive is required, polypropylene and low-density polyethylene are added into an inner cylinder 3, the raw material is discharged through a first discharging pipe 31, the polypropylene and the low-density polyethylene fall into a middle cylinder 2, paraffin, stearic acid, naphthalene and a TPR elastomer are added into a material separating cylinder 4, the raw material is discharged into the middle cylinder 2 through a second discharging pipe 41, a motor 34 is started before the raw material is fed, an upper cover 22 is covered after the material feeding is finished, and the upper cover 22 and an inner ring of the middle cylinder 2 are assembled in a sealing mode through a sealing ring 24. At this moment, under the starting action of the motor 34, the rotating shaft 33 rotates to rotate the inner barrel 3, so that the inner barrel 3 and the material distribution barrel 4 rotate synchronously along with the rotating shaft 33, the first feeding pipe 31 and the second feeding pipe 41 feed while rotating, the feeding while rotating makes the raw materials stacked uniformly, the raw materials are already dispersed before the reaction, at this moment, water or other flowable media can pass through the liquid inlet pipe 12, the media meeting the heating condition can be used, the power connection end 14 is electrically connected to start, the heating plate 15 is heated, the heating plate 15 heats the media in the cavity, the heat of the central barrel 2 is fully preserved, and what needs to be explained is that the heating plate can be selectively arranged in the middle of the barrel wall of the central barrel 2 in the scheme, and the heating temperature is met. Stirring board 36's setting is with raw materials compounding once more in the raw materials reaction for the raw materials is more even, and the binder after making passes through discharging pipe 21 unloading, can through the granulator granulation.

After the completion, the control valve body on the liquid outlet pipe 13 is opened, and the medium flows out of the cavity.

The raw materials of the adhesive component prepared by the reaction equipment in the scheme are dispersed more uniformly, and the processing efficiency is improved by 20.5 percent compared with the original processing efficiency, so that the preparation time is shortened.

The binder prepared in the first to third embodiments is combined with titanium alloy powder with the same mass, and metal gear pieces prepared by an injection molding process are tested for average performance of 90 metal gears prepared in the same batch (30 metal gears are prepared for each embodiment), and the specific test results are shown in the following table:

	example one	Example two	EXAMPLE III
				Porosity (%)	1.38	3.01	2.14
Density (%)	98.99	98.87	99
				Precision (%)	±0.25	±0.35	±0.2
Tensile strength (MPa)	1320	1300	1280
				Percent defective index (%)	0.12	0.27	0.18

From the data table, it can be seen that the metal gear parts prepared in the first to third embodiments have the best performance, the highest tensile strength, the lowest porosity and the lowest rejection rate.

The above embodiments are only some preferred embodiments of the present invention, and many alternative modifications and combinations of the above embodiments may be made by those skilled in the art based on the technical solution of the present invention and the related teachings of the above embodiments.

Claims

1. A binder for injection molding of a powdered titanium alloy, characterized by: the binder is prepared from the following raw materials in parts by mass: 20-35 parts of polypropylene, 60-75 parts of low-density polyethylene, 12-18 parts of paraffin, 0.8-1.2 parts of stearic acid, 7-9 parts of naphthalene and 1.5-2.5 parts of TPR elastomer;

processing the raw materials in parts by mass through reaction equipment, and granulating the raw materials through a granulator to form binder particles;

the reaction equipment comprises an outer barrel, a middle barrel which is equal to the outer barrel in height is installed in the outer barrel, a cylindrical inner barrel is arranged in the middle barrel, a rotating shaft is fixedly connected to the bottom of the inner barrel, one end, penetrating through the outer barrel, of the rotating shaft is connected with a motor, the motor is connected with a bottom bolt of the outer barrel, a material distribution barrel with the inner diameter smaller than that of the inner barrel is installed in the inner barrel, a plurality of material distribution pipes II penetrating through the inner barrel are installed on an outer ring array of the material distribution barrel, a plurality of material distribution pipes I are arranged on the outer ring of each material distribution pipe I, and a detachable filter screen is connected to one end, in each material distribution pipe, of each material distribution pipe I.

2. The binder for injection molding of powdered titanium alloy according to claim 1, wherein the binder is composed of the following raw materials in parts by mass: 20 parts of polypropylene, 60 parts of low-density polyethylene, 12 parts of paraffin, 0.8 part of stearic acid, 7 parts of naphthalene and 1.5 parts of TPR elastomer.

3. The binder for injection molding of powdered titanium alloy according to claim 1, wherein the binder is composed of the following raw materials in parts by mass: 35 parts of polypropylene, 75 parts of low-density polyethylene, 18 parts of paraffin, 1.2 parts of stearic acid, 9 parts of naphthalene and 2.5 parts of TPR elastomer.

4. The binder for injection molding of powdered titanium alloy according to claim 1, wherein the binder is composed of the following raw materials in parts by mass: 30 parts of polypropylene, 70 parts of low-density polyethylene, 15 parts of paraffin, 1 part of stearic acid, 8 parts of naphthalene and 2 parts of TPR elastomer.

5. The bonding agent for injection molding of the powder titanium alloy as claimed in claim 1, wherein a plurality of supporting legs are installed at the bottom of the outer cylinder, an upper cover is movably installed at the top of the middle cylinder, an L-shaped handle is installed at the top of the upper cover, a hanging ring for matching installation with the handle is connected to the outer wall of the outer cylinder, a sealing ring is connected to one side of the upper cover, and the outer ring of the sealing ring is in matching and sealing connection with the inner wall of the middle cylinder.

6. The binder for injection molding of powdered titanium alloy as claimed in claim 1, wherein a cavity is provided between the middle cylinder and the outer cylinder, a heating plate is installed on the inner bottom wall of the cavity, the input control end of the heating plate is electrically connected with a power connection end through a wire, the power connection end is installed on the outer bottom wall of the outer cylinder, a discharge pipe is installed on the bottom of the middle cylinder, and a control valve body is installed on the discharge pipe.

7. The binder for injection molding of powdered titanium alloy as claimed in claim 1, wherein a liquid inlet pipe is installed on the outer wall of the outer cylinder, a liquid outlet pipe installed on the outer cylinder is installed below the liquid inlet pipe, and control valves are installed on both the liquid inlet pipe and the liquid outlet pipe.

8. The binder for injection molding of the powder titanium alloy as claimed in claim 1, wherein a plurality of connecting rods are mounted on the outer ring array of the rotating shaft, one end of each connecting rod is connected with a stirring plate, one side of each stirring plate, which is far away from the corresponding connecting rod, is in contact with the inner wall of the middle cylinder, and a plurality of material leaking holes are formed in each stirring plate.

9. The bonding agent for injection molding of the powder titanium alloy as claimed in claim 1, wherein the first feeding tube is located above the second feeding tube, one side of the filter screen is connected with a connecting tube, the connecting tube is connected with a clamping block, the connecting tube is adapted to an inner wall of the first feeding tube, and the clamping block is a high-elasticity hard plastic body.