CN108501266B - Surface shaping method of injection molding part and injection molding part - Google Patents
Surface shaping method of injection molding part and injection molding part Download PDFInfo
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- CN108501266B CN108501266B CN201810247884.9A CN201810247884A CN108501266B CN 108501266 B CN108501266 B CN 108501266B CN 201810247884 A CN201810247884 A CN 201810247884A CN 108501266 B CN108501266 B CN 108501266B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
- B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
Abstract
The invention discloses a surface shaping method of an injection molding part and the injection molding part, comprising the following steps: (1) carrying out first etching on the inner surface of a mould for forming an injection molding part, and forming a grain layer on the inner surface of the mould; (2) laying a grid layer on the grain layer, and etching the grain layer for the second time by the grid layer so as to enhance the dispersion degree of grain sizes of grains in the grain layer; (3) spraying sand grains to the inner surface of the mold, and forming protrusions on the surface of the grain layer; (4) and pouring an injection molding material into the mold to form the injection molding piece, wherein the grain layer forms grains on the surface of the injection molding piece. The invention provides a surface shaping method of an injection molding part and the injection molding part, which can reduce the surface glossiness of the injection molding part, improve the surface quality, reduce the production cost and improve the product competitiveness.
Description
Technical Field
The invention relates to the technical field of coating preparation, in particular to a surface shaping method of an injection molding part and the injection molding part.
Background
In the automotive interior, taking an instrument panel as an example, the instrument panel is arranged in the middle area of a front cabin of a vehicle body, and the appearance quality of the automotive interior is highly concerned by consumers, particularly drivers and copilot passengers, and directly influences the evaluation feeling of the consumers on the design of the automotive interior. The instrument panel is usually an injection molded part, and the surface of the injection molded part is treated, for example, a coating is arranged on the surface of the injection molded part, so that the glossiness can be reduced, the appearance defects can be shielded, the surface quality can be improved, and the attractiveness can be improved.
The injection molding part usually has the problem of high glossiness, and if the instrument panel formed by injection molding is directly arranged on a vehicle body, the vision of a driver is influenced by reflection of light, and the surface glossiness of the instrument panel is reduced. Generally, the surface of injection-molded parts is painted in order to cover appearance defects and reduce the gloss of the surface. The texture of the injection molding part can be improved by adopting the paint made of special materials, and if the soft touch paint is sprayed on an instrument panel, the soft touch feeling can be brought. However, after the paint spraying is introduced, the disadvantages of cost increase, additional working procedures and working hours, VOC risk, surface orange peel problem and the like are brought, and the application of the paint spraying on interior trim injection molding products is also hindered; especially in the competitive market of entrance-class cars with increasingly strong cost competition, the introduction of spray paint into injection molded parts can greatly weaken the competitiveness of products.
Therefore, a method for surface molding of injection-molded parts and injection-molded parts are needed to solve the above problems.
Disclosure of Invention
In view of this, the present invention provides a surface molding method for an injection molding part and an injection molding part, which can reduce the surface gloss of the injection molding part, improve the surface quality, reduce the production cost, and improve the product competitiveness.
The invention provides a surface shaping method of an injection molding part based on the above purpose, which comprises the following steps:
(1) carrying out first etching on the inner surface of a mould for forming an injection molding part, and forming a grain layer on the inner surface of the mould;
(2) laying a grid layer on the grain layer, and etching the grain layer for the second time by the grid layer so as to enhance the dispersion degree of grain sizes of grains in the grain layer;
(3) spraying sand grains to the inner surface of the mold, and forming protrusions on the surface of the grain layer;
(4) and pouring an injection molding material into the mold to form the injection molding piece, wherein the grain layer forms grains on the surface of the injection molding piece.
Preferably, step (1) further comprises: the first etching and the second etching are both etched by adopting etching liquid, the first etching is transferred to the mould through the printing text layer with rough dermatoglyph, and the second etching is transferred to the mould through the grid layer.
Preferably, step (1) further comprises: and setting the pattern drawing angle of the grain layer to be larger than 6 degrees, and setting the grain diameter of the grain layer to be larger than 1 mm.
Preferably, step (2) further comprises: the grid layer is arranged on the dermatoglyph paper, and the dermatoglyph paper is arranged on the grain layer, wherein the grid layer is formed by a plurality of randomly arranged grid lines.
Preferably, step (2) further comprises: the maximum diameter of the grids formed by the grid lines is smaller than 1mm, so that the grid layer cuts the grain diameter of the grain layer into grains smaller than 1 mm.
Preferably, step (3) further comprises: and (3) loading the sand grains into a spraying device, and adjusting the spraying pressure of the spraying device to be 500-800 kpa.
Preferably, step (4) further comprises: adding molten grease particles into the injection molding material, and uniformly mixing the molten grease particles with the injection molding material.
Preferably, before the step (3), the method further comprises: orthogonal test design is carried out on the control factors of the injection molding process, and test results of the orthogonal test design are analyzed to determine the optimal combination of the control factors.
Further, preferably, the control factor includes: the molten grease coefficient of the molten grease particles, the injection pressure of the injection equipment, the gate feeding sequence, the injection pressure, the injection flow rate, the pressure maintaining pressure and the pressure maintaining flow rate.
The invention also provides an injection molding part, the surface of which is obtained by the surface shaping method of the injection molding part.
From the above, it can be seen that the surface shaping method for injection molding parts and the injection molding parts provided by the invention have the following advantages compared with the prior art: the method is characterized in that the method combines two times of etching and sand blasting processes, further cuts the dermatoglyph with larger particle size, enhances the discrete degree of the dermatoglyph particle size, and forms lines with lower surface gloss and higher surface quality on the surface of an injection molding after pouring, molding and drawing the die. Moreover, the injection molding piece obtained by the injection molding process can reduce the painting process, save the working hours and reduce the production cost; meanwhile, the risks of problems of volatile organic matters, odor, surface orange peel and the like caused by paint spraying are avoided, and the product competitiveness is improved.
Drawings
The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic flow chart of a method for surface shaping of injection molded parts used in an embodiment of the present invention.
Fig. 2a is a schematic view of coarse grained surface particles obtained by a method of surface shaping of the injection molded part shown in fig. 1.
Fig. 2b is a schematic view of micro-scale dermatoglyphic surface particles obtained by the method for surface shaping of the injection molded part shown in fig. 1.
Fig. 3 is a graph showing a comparison of the particle size distribution of surface particles of both coarse and micro-grid skin lines obtained by the surface molding method of the injection molded part shown in fig. 1.
Wherein the reference numbers:
1: coarse dermatoglyph; 2: micro-mesh dermatoglyphs.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings. The terms "inner" and "outer" are used to refer to directions toward and away from, respectively, the geometric center of a particular component.
FIG. 1 is a schematic flow chart of a method for surface shaping of injection molded parts used in an embodiment of the present invention. As shown in fig. 1, a method of surface shaping an injection molded part includes:
(1) carrying out primary etching on the inner surface of a mould for forming an injection molding part, and forming a grain layer on the inner surface of the mould;
(2) laying a grid layer on the grain layer, and etching the grain layer for the second time by the grid layer so as to enhance the dispersion degree of grain diameters of grains in the grain layer;
(3) spraying sand grains to the inner surface of the mold to form protrusions on the surface of the grain layer;
(4) and pouring an injection molding material into the mold to form an injection molding piece, wherein the grain layer forms grains on the surface of the injection molding piece.
Carrying out first etching on the inner surface of the mold to form a rough dermatoglyph 1, carrying out second etching by introducing a grid layer on the basis of the rough dermatoglyph 1 and combining a sand blasting process, further disorderly cutting the rough dermatoglyph 1, forming pits, bulges and other fluctuation on sand grains on the surface layer to form a micro-grid dermatoglyph 2, and further enhancing the dispersion degree of grain size of grains; then, the mould is poured and molded, micro-grid lines are formed on the surface of the injection molding part, the glossiness of the surface is reduced, meanwhile, the defects on the surface of the injection molding part are covered, and the surface quality is improved. Moreover, the injection molding piece obtained by the injection molding process can reduce the painting process, save the working hours and reduce the production cost; meanwhile, the risks of problems of volatile organic matters, odor, surface orange peel and the like caused by paint spraying are avoided, and the product competitiveness is improved.
Preferably, step (1) further comprises: the first etching and the second etching both adopt etching liquid to etch, the first etching is transferred to the mould through the printing text layer with rough dermatoglyph, and the second etching is transferred to the mould through the grid layer. And the etching is completed by utilizing the chemical reaction between the etching liquid and the inner surface material of the mold. The etching liquid is adopted for etching, and the method has the advantages of low cost, simple equipment, high production efficiency and the like.
In the embodiment, the components of the etching solution include, but are not limited to, ferric trichloride and hydrochloric acid, wherein the concentration of ferric trichloride is 475g/L, and the concentration of hydrochloric acid is 5 ml/L. The first etching uses the printing paper with coarse dermatoglyph with grain diameter larger than 1mm, and the pattern is guided to the mould, the mould is cleaned by clean water after the first etching is finished, and whether the etching depth meets the requirement is checked, if not, the steps can be repeated; then, the second etching uses the secondary grid dermatoglyph paper with grain diameter less than 1mm, and the second decal transfer is carried out on the mould by the same etching liquid and the etching is finished.
Fig. 2a is a schematic view of the surface grains of the coarse grain 1 obtained by the method for surface shaping of the injection-molded part shown in fig. 1. As shown in fig. 2a, rough skin 1 is formed by first etching on the inner surface of the mold.
The texture with a small particle size can be formed by etching the inner surface of the mold twice so as to obtain a suitable glossiness, and in forming the coarse dermatoglyph, preferably, the step (1) further comprises: the pattern drawing angle of the grain layer is set to be larger than 6 degrees, and the grain diameter of the grain layer is set to be larger than 1 mm.
In order to further reduce the surface gloss of the injection molded part, the rough skin 1 on the mold needs to be cut out disorderly to enhance the dispersion degree of the particle size, and in order to simplify the manufacturing process and reduce the production cost, preferably, the step (2) further comprises: the grid layer is arranged on the leather grain paper, and the leather grain paper is arranged on the grain layer, wherein the grid layer is formed by a plurality of randomly arranged grid lines. And randomly introducing grid lines to cut into the coarse dermatoglyph 1, and performing disordered cutting on the coarse dermatoglyph 1 to reduce the grain size of the grains and increase the dispersion degree of the grain size.
Fig. 2b is a schematic view of micro-scale dermatoglyphic surface particles obtained by the method for surface shaping of the injection molded part shown in fig. 1. As shown in fig. 2b, the micro-mesh dermatoglyph 2 is formed by providing a grid layer on the inner surface of the mold.
In order to improve the surface quality of the injection molded part and avoid uneven glossiness, preferably, the step (2) further comprises: the maximum diameter of the grid formed by the grid lines is smaller than 1mm, so that the grid layer cuts the grain diameter of the grain layer into the grain diameter smaller than 1 mm. When the particle size of the micro-grid dermatoglyph 2 of the injection molding piece is controlled to be less than 1mm, the surface glossiness is further reduced, the uniformity of the surface glossiness is improved, and the local light reflection is avoided from being serious.
Preferably, step (3) further comprises: and (3) filling sand grains into the spraying equipment, and adjusting the spraying pressure of the spraying equipment to be 500-800 kpa. The spraying pressure refers to the pressure generated at the muzzle of the spray gun when the spraying equipment (such as the spray gun) is used for carrying out sand blasting treatment on the inner surface of the mold, the larger the pressure is, the larger the impact force of sand grains on the inner surface of the mold is, and under the high pressure, the spraying equipment carries out sand blasting on the surface of the mold, so that the signal-to-noise ratio and the average value of the surface glossiness can be improved, and the surface defects can be reduced.
Preferably, step (4) further comprises: adding molten grease particles into the injection molding material, and uniformly mixing the molten grease particles with the injection molding material. By using the molten fat particles, the signal-to-noise ratio and the average value of the surface glossiness can be improved, and the surface defects can be reduced.
In this embodiment, the material particle molten grease refers to that a material with a corresponding molten grease coefficient is selected and sufficiently mixed with a plastic material on the premise of keeping the standard of the plastic material. The molten fat material can be lake stone 352S with a molten fat index of 10g/min, or lake stone 362T with a molten fat index of 20 g/min.
Preferably, before the step (3), the method further comprises: orthogonal test design is carried out on the control factors of the injection molding process, and test results of the orthogonal test design are analyzed to determine the optimal combination of the control factors. A plurality of control factors are set in an orthogonal test, and the control factors with larger influence on the glossiness and the appearance quality are quickly analyzed through the test result so as to adjust corresponding parameters in the injection molding process and obtain the appearance with lower glossiness and higher quality.
In order to improve the flowability and the moldability of the raw material particles in the mold, the following control factors are included in the orthogonal test as parameters of the injection molding process, and in addition, preferably, the control factors include: the molten grease coefficient of the molten grease particles, the injection pressure of the injection equipment, the gate feeding sequence, the injection pressure, the injection flow rate, the holding pressure and the holding pressure flow rate.
The molten resin coefficient of the molten resin particles represents the flow property of the plastic in a molten state, the index unit of the molten resin particles is g/min generally, and the higher the value is, the better the flow property is; the injection pressure of the injection device can refer to the foregoing description, and is not described in detail herein; the adjustment of the feeding sequence of the pouring gates depends on that each injection pouring gate adopts a sequence valve, and the feeding sequence can be adjusted by controlling the valve opening time and the valve closing time of each pouring gate, in the embodiment, 3 levels of the feeding sequence of the pouring gates are respectively the feeding sequence (1#) of the traditional cascade design, the opening time (2#) of the nozzle of the lightening area of the part is shortened on the basis of the cascade design, and the opening time (3#) of the nozzle of the area where the part is easy to generate tiger skin lines is increased on the basis of the cascade design; the conventional cascade design feeding sequence means that when the melt passes through one nozzle, the nozzle is opened, and the hot melt coming out of the new nozzle renews the front edge of the melt, so that no seam is formed; the injection pressure and the injection flow rate refer to the pressure and the flow rate provided by the injection machine in the filling stage; the holding pressure and holding pressure flow rate refer to the pressure and flow rate provided by the injection molding machine in the holding pressure stage.
In the present embodiment, the above parameters are all set at three levels, using L18 (2)1×37) Table the experiment was arranged as shown in table 1.
TABLE 1 control factor level table in orthogonal experiments
By adopting the surface molding method of the injection molding part, the injection molding processing and the surface treatment are carried out on the injection molding part (such as an instrument plate) according to the setting of various parameters in the table 1, the optimal process conditions are selected, and the obtained glossiness result and the appearance evaluation result are shown in the table 2. Wherein, the gloss evaluation refers to measuring the influence of the surface shaping method on the reflection characteristic of the product from the gloss value of each measuring point on the surface of an injection molding piece (such as an instrument plate), and the average value is the arithmetic average value of the gloss of each measuring point, and the lower the value is, the better the value is; the signal-to-noise ratio, i.e. the ratio of the gloss value to the noise (in this example, other environmental parameters affecting the injection molding result, which are not included in the control factor), is preferably higher. The appearance quality evaluation refers to evaluating and scoring the surface appearance state of an injection molding piece (such as an instrument plate), wherein the average value of the surface appearance state is the average value of all evaluation scores, and the higher the value is, the better the value is; the signal-to-noise ratio, i.e., the ratio of the appearance score to the noise, is as high as possible.
TABLE 2 analysis List of results of orthogonal experiments
Table 2 shows that, in terms of adjusting the glossiness, the selection of the material particle molten grease with a higher molten grease index and the selection of the spraying device providing a higher sand blasting pressure can improve the glossiness signal-to-noise ratio and the average value (increase the signal-to-noise ratio value and decrease the average value) at the same time, and the influence of other control factors on the glossiness is not obvious. In the aspect of appearance quality evaluation, material particles with higher melt fat index are selected, the feeding time sequence of each sprue is adjusted, higher injection pressure and higher injection flow are used, and lower pressure maintaining pressure and pressure maintaining flow are used, so that the signal-to-noise ratio and the mean value of the appearance quality can be improved (the signal-to-noise ratio value is increased, the mean value is increased), and the surface defects are reduced and the appearance quality is improved in the practical effect.
The optimal conditions analyzed according to the orthogonal test are { A2, B3, C3, D3, E3, F1 and G1}, namely high melt flow coefficient, high sand blasting pressure, sequential valve scheme for increasing the opening time of a nozzle of a part in a region where tiger stripes are easy to generate, high injection pressure, high injection flow rate, low holding pressure and low holding pressure flow rate.
Fig. 3 is a graph showing a comparison of the particle size distribution of surface particles of both coarse and micro-grid skin lines obtained by the surface molding method of the injection molded part shown in fig. 1. As shown in fig. 3, the abscissa is the size interval of the grain size of the dermatoglyph grains, and each grid is 0.1 mm; the ordinate on the left side represents the number (unit: number) of grains in the grain size range, and the ordinate on the right side represents the grain size distribution function (unit: specific gravity).
After the mold is subjected to primary etching and injection molding, coarse dermatoglyphs 1 are formed on the surface of an injection molding part, a particle size distribution graph made according to particles of the coarse dermatoglyphs 1 is shown as a solid line, the trend of the solid line is observed, the particle size distribution of the particles of the coarse dermatoglyphs 1 is concentrated, the frequency peak values (52) appear between 1.7 and 1.8mm, normal distribution fitting is adopted, the statistical average value of the particle sizes is 1.62, and the standard deviation is 1.62
The mould completes the secondary etching and sand blasting process, and after injection molding, the injection molding piece is subjected toForming micro-mesh dermatoglyphs 2 on the surface, wherein a particle size distribution graph made according to micro-mesh dermatoglyphs 2 particles is shown by dotted lines, and observing the trend of the dotted lines shows that two frequency peaks exist in the particle size distribution of the micro-mesh dermatoglyphs 2 particles, wherein the frequency peaks respectively appear between 0.5 mm and 0.6mm and between 1.7 mm and 1.8 mm; the main frequency peak between 1.7 mm and 1.8mm inherits the particle size distribution rule of the coarse dermatoglyph 1, but the particle size is reduced through operations such as micro-grid segmentation and the like; the secondary frequency peak between 0.5 mm and 0.6mm is the embodiment of newly formed small particles, normal distribution fitting is adopted, the statistical average value of the particle sizes is 1.28, and the standard deviation is
Therefore, the injection molding piece obtained by the method randomly introduces the shallow grid lines to perform disorder segmentation on the rough leather layer on the basis of the rough leather layer, and then sprays sand grains through the spraying equipment to form fluctuation such as pits or grain bulges on the rough leather layer, so that the dispersion degree of the grain size of the leather is enhanced, the glossiness is reduced, and the appearance quality is improved.
The following takes an instrument panel as an example, and further describes the construction process of the surface shaping method of the injection molding part.
Firstly, selecting a plurality of control factors to carry out an orthogonal test, and carrying out actual production according to the optimal conditions analyzed by the orthogonal test.
And secondly, etching the inner surface of the mold for the first time by adopting etching liquid to form a coarse dermatoglyph line layer. And laying grid lines on the coarse dermatoglyph line layer, and performing secondary etching on the grid lines to form the micro-mesh dermatoglyph line layer.
And thirdly, adjusting the sand blasting pressure of the spraying equipment to 8bar, and performing sand blasting on the micro-grid dermatoglyph line layer.
And finally, fully mixing the molten grease material with a high grease index with the plastic material, pouring into the mold, preferentially feeding a pouring gate in an area with uneven glossiness and easy generation of tiger skin lines for pouring, using high injection pressure and injection flow, using low pressure maintaining pressure and pressure maintaining flow, and forming and drawing the micro-grid skin lines 2 on the surface of the instrument panel to ensure that the instrument panel has low glossiness and high appearance quality. The test shows that the average value of the glossiness of the instrument panel is 1.375, and the average value of the appearance evaluation is 9 +. By the method, a paint spraying process can be omitted, working hours are saved, environmental pollution is avoided, production cost is reduced, and meanwhile good glossiness, texture and appearance quality are improved.
The invention also provides an injection molding part, and the surface of the injection molding part is obtained by the surface shaping method of the injection molding part.
From the above description and practice, it can be seen that the surface shaping method for injection-molded parts and the injection-molded parts provided by the present invention have the following advantages compared with the prior art: the method is characterized in that the method combines two times of etching and sand blasting processes, further cuts the dermatoglyph with larger particle size, enhances the discrete degree of the dermatoglyph particle size, and forms lines with lower surface gloss and higher surface quality on the surface of an injection molding after pouring, molding and drawing the die. Moreover, the injection molding piece obtained by the injection molding process can reduce the painting process, save the working hours and reduce the production cost; meanwhile, the risks of problems of volatile organic matters, odor, surface orange peel and the like caused by paint spraying are avoided, and the product competitiveness is improved.
Those of ordinary skill in the art will understand that: the above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit of the present invention should be included in the scope of the present invention.
Claims (3)
1. A method of surface shaping an injection molded part, comprising:
(1) carrying out first etching on the inner surface of a mold for forming an injection molding piece, wherein the first etching forms rough dermatoglyph, and a texture layer is formed on the inner surface of the mold; the first etching is transferred to the die through a print layer with rough dermatoglyphs, the die drawing angle of the grain layer is set to be larger than 6 degrees, and the grain diameter of the grain layer is set to be larger than 1 mm;
(2) laying a grid layer on the grain layer, wherein on the basis of the rough skin, the grid layer contains shallow grid lines introduced randomly, the rough skin is subjected to disorder segmentation, and the grid layer is subjected to secondary etching on the grain layer so as to enhance the dispersion degree of grain sizes of grains in the grain layer; etching by using an etching liquid in the first etching and the second etching, and transferring the second etching to the mold through the grid layer; the grid layer is arranged on the dermatoglyph paper, and the dermatoglyph paper is arranged on the grain layer, wherein the grid layer is formed by a plurality of randomly arranged grid lines; the maximum diameter of the grids formed by the grid lines is smaller than 1mm, so that the grid layer cuts the grain diameter of the grain layer into smaller than 1 mm;
(3) carrying out orthogonal test design on control factors of an injection molding process, and analyzing test results of the orthogonal test design to determine the optimal combination of the control factors; sand grains are sprayed to the inner surface of the mold, protrusions are formed on the surface of the grain layer, the grid layer is introduced for secondary etching, and meanwhile, the sand blasting process is combined, the coarse dermatoglyph is further cut disorderly, and the micro-grid dermatoglyph is formed; loading the sand grains into a spraying device, and adjusting the spraying pressure of the spraying device to be 500-800 kpa;
(4) and pouring an injection molding material into the mold to form the injection molding piece, forming micro-grid lines on the surface of the injection molding piece by the line layer, adding molten grease particles into the injection molding material, uniformly mixing the molten grease particles with the injection molding material, and pouring into the mold.
2. Method for surface shaping of injection-molded parts according to claim 1,
the control factors include: the molten grease coefficient of the molten grease particles, the injection pressure of the injection equipment, the gate feeding sequence, the injection pressure, the injection flow rate, the pressure maintaining pressure and the pressure maintaining flow rate.
3. An injection-molded part, characterized in that the surface of the injection-molded part is obtained by a method of surface-shaping an injection-molded part according to claim 1 or 2.
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