阅读说明：本技术 一种3d打印机橡胶刮刀及其制备方法 (3D printer rubber scraper and preparation method thereof ) 是由 聂磊 于 2019-11-13 设计创作，主要内容包括：本申请提供一种3D打印机橡胶刮刀及其制备方法,其中矩形基体支撑整个胶条,结构简单,安装方便,且因其大面积而有利于在安装时使其容易达到所需的安装精度。上厚下薄的刮刀部上端对推动粉层提供了一定的支撑力,刮刀部最下端形成的刀刃对刮粉层的厚、薄、稀、密都能保持比较均匀一致,且在必要时,刀刃部位还有避让功能。而且本申请的3D打印机橡胶刮刀采用整体硫化,一次成型的加工工艺加工而成,且设计模具时将上模以及下模的分模面设置在基体最上端倒角处,保证刮刀部最下端(即刀刃)部位的完整性。(The application provides a 3D printer rubber scraper and a preparation method thereof, wherein a rectangular base body supports the whole rubber strip, the structure is simple, the installation is convenient, and the large area is favorable for enabling the rubber scraper to easily reach the required installation precision during the installation. The upper end of the scraper part with the thick upper part and the thin lower part provides a certain supporting force for pushing the powder layer, the thickness, thinness and density of the powder layer can be kept uniform by the cutting edge formed at the lowest end of the scraper part, and the cutting edge part has an avoiding function when necessary. And the 3D printer rubber scraper of this application adopts whole vulcanization, and one shot forming's processing technology processing forms, and will go up the mould and the parting face setting of lower mould in base member top chamfer department during the design mould, guarantees the integrality at scraper portion lower extreme (cutting edge promptly) position.)

1. The utility model provides a 3D printer rubber scraper which characterized in that: including the base member of bar and the scraper portion that integrated into one piece just extends along the length direction of base member in base member bottom, wherein the longitudinal section of base member all is equipped with the rectangle structure of chamfer for four angle ends, the width of scraper portion is by the direction that toward keeping away from the base member bottom with base member bottom junction reduce gradually.

2. The 3D printer rubber scraper of claim 1, characterized in that: the both sides of scraper portion longitudinal section are mutual symmetry and toward two concave first circular arcs in scraper portion center, and the lower extreme of scraper portion longitudinal section is the second circular arc, wherein the second circular arc is the semicircle, and two endpoints of second circular arc are connected with two first circular arcs respectively.

3. The 3D printer rubber scraper of claim 1, characterized in that: still be provided with firm portion between base member and the scraper portion, and base member, scraper portion, firm portion are integrated into one piece, just the maximum width of scraper portion is the same with the width of firm portion.

4. The preparation method of the 3D printer rubber scraper as claimed in claim 1, characterized by comprising the following steps:

step 1: cutting the rubber material into strips according to the size and weight required by the die;

step 2: preheating a die and a machine table, and heating to 170 ℃;

and step 3: putting the rubber materials cut into strips into a mold in order, closing the mold, putting the mold into a vulcanizing machine, and carrying out pressurization and exhaust treatment;

and 4, step 4: keeping the rubber material in the mold and the mold in a pressurized state on a vulcanizing machine, and heating to 170 ℃ for vulcanizing for 10 minutes;

and 5: opening the mold and taking out the product;

step 6: and (4) putting the product treated in the step (5) in an oven in order, heating to 230 ℃, and carrying out secondary vulcanization for 24 hours.

And 7: and taking out the product, cooling, deburring, inspecting, packaging and warehousing.

5. The preparation method of the 3D printer rubber scraper as claimed in claim 4, wherein the preparation method comprises the following steps: in step 2, the mold is preheated and heated to 170 ℃.

6. The preparation method of the 3D printer rubber scraper as claimed in claim 4, wherein the preparation method comprises the following steps: in step 4, the pressurization pressure is 50KG and the number of degassing is 3.

7. The preparation method of the 3D printer rubber scraper as claimed in claim 4, wherein the preparation method comprises the following steps: the die used in the step 2 comprises an upper die and a lower die, and the die parting surfaces of the upper die and the lower die are aligned with the chamfer at the uppermost end of the base body.

Technical Field

The invention relates to the field of 3D printing rubber strips, in particular to a rubber scraper of a 3D printer and a preparation method thereof.

Background

The rubber scraper of the 3D printer in the prior art adopts a structure as shown in figure 3, wherein a comb-shaped base structure does not have a good effect on the stability of installation.

After the base member part was designed into the comb shape, middle coupling part and broach all showed weak, even the broach can stabilize the installation in sectional fixture, also can lead to scraper part unstable because coupling part's weak, and then influences the whole degree of consistency of the thickness rare density of spreading the powder. And the comb teeth are configured such that, when installed, each tooth is mounted within a corresponding tooth slot of the jig. In fact, this is a troublesome and time-consuming matter in the case of such softness and relatively long length.

In addition, the structure in the prior art also has higher requirements on the processing technology. The product with the structure has two processing technologies which can be selected, one is an extrusion technology, and the other is a die pressing technology. Both of these processes have significant disadvantages. The product produced by using the extrusion process has the cross section sizes which are different in size at different positions, so that the straightness of the cutting edge part of the scraper is poor, and the cutting edge part of the scraper is not parallel to the mounting position, so that the thickness and the uniformity of powder laying of the product are influenced. And the product produced by the process has poor surface roughness, so that the wear resistance of the scraper part of the product is poor, and the powder pushing part is easy to adhere and is difficult to remove. When the mould pressing technology is used for production, the mould division mode of the mould pressing technology is required to be the symmetrical mould division mode shown in figure 4 due to the shape of the mould pressing technology. Since the parting surface of the mold is at the very tip of the scraper portion of the product, the product produced in this way is likely to have some more or less burrs, flashes or other defects, and these small defects will certainly affect the powder spreading effect and thus the quality of the 3D printed product.

Disclosure of Invention

In order to solve the problems, the invention provides the 3D printer rubber scraper, the rectangular base body supports the whole rubber strip, the structure is simple, the installation is convenient, and the large area is favorable for enabling the rubber scraper to easily achieve the required installation precision during the installation. The upper end of the scraper part with the thick upper part and the thin lower part provides a certain supporting force for pushing the powder layer, the thickness, thinness and density of the powder layer can be kept uniform by the cutting edge formed at the lowest end of the scraper part, and the cutting edge part has an avoiding function when necessary.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a 3D printer rubber scraper, includes the base member and the scraper portion that integrated into one piece extends in the base member bottom and along the length direction of base member of bar, wherein the longitudinal section of base member all is equipped with the rectangle structure of chamfer for four angle ends, the width of scraper portion is by the direction of keeping away from the base member bottom gradually reducing with base member bottom junction.

Further, the both sides of scraper portion longitudinal section are mutual symmetry and toward two concave first circular arcs in scraper portion center, and the lower extreme of scraper portion longitudinal section is the second circular arc, wherein the second circular arc is the semicircle, and two endpoints of second circular arc are connected with two first circular arcs respectively.

Further, still be provided with firm portion between base member and the scraper portion, and base member, scraper portion, firm portion are integrated into one piece, just the maximum width of scraper portion is the same with the width of firm portion.

In order to solve the problems, the invention provides a preparation method of the 3D printer rubber scraper, and the invention also provides a preparation method of the 3D printer rubber scraper, which comprises the following steps:

step 1: cutting the rubber material into strips according to the size and weight required by the die;

step 2: preheating a die and a machine table, and heating to 170 ℃;

and step 3: putting the rubber materials cut into strips into a mold in order, closing the mold, putting the mold into a vulcanizing machine, and carrying out pressurization and exhaust treatment;

and 4, step 4: keeping the rubber material in the mold and the mold in a pressurized state on a vulcanizing machine, and heating to 170 ℃ for vulcanizing for 10 minutes;

and 5: opening the mold and taking out the product;

step 6: and (4) putting the product treated in the step (5) in an oven in order, heating to 230 ℃, and carrying out secondary vulcanization for 24 hours.

And 7: and taking out the product, cooling, deburring, inspecting, packaging and warehousing.

Further, the die used in the step 1 comprises an upper die and a lower die, and the parting surfaces of the upper die and the lower die are aligned with the position of the uppermost chamfer of the base body.

The invention has the beneficial effects that:

1.3D printer rubber scraper, including the base member of bar and the scraper portion that integrated into one piece just extends along the length direction of base member in base member bottom, wherein the longitudinal section of the base member on upper portion all is equipped with the rectangle structure of chamfer for four angle ends, the width of the scraper portion of lower part is by reducing gradually with the direction of base member bottom junction toward keeping away from the base member bottom, wherein the whole adhesive tape of rectangle base member support, moreover, the steam generator is simple in structure, high durability and convenient installation, and be favorable to making it reach required installation accuracy easily when the installation because of its large tracts of land. The upper end of the scraper part with the thick upper part and the thin lower part provides a certain supporting force for pushing the powder layer, the thickness, thinness and density of the powder layer can be kept uniform by the cutting edge formed at the lowest end of the scraper part, and the cutting edge part has an avoiding function when necessary.

2. The mould is processed by adopting the processing technology of integral vulcanization and one-step molding, and the parting surfaces of the upper mould and the lower mould are arranged at the chamfer of the uppermost end of the base body when the mould is designed, so that the integrity of the lowermost end (namely the cutting edge) of the scraper part is ensured.

Drawings

Fig. 1 is a front view of a 3D printer rubber blade in the present invention.

Fig. 2 is a schematic perspective view of a rubber scraper of a 3D printer according to the present invention.

Fig. 3 is a front view of a rubber blade of a 3D printer employed in the prior art.

Fig. 4 is a diagram of a mold structure for preparing a rubber blade of a 3D printer according to the prior art.

Fig. 5 is a die structure diagram for preparing the rubber blade of the 3D printer of the present application.

The reference numbers illustrate: 1.3D printer rubber scraper; 11. a substrate; 111. chamfering; 12. a stabilizing section; 13. a scraper section; 131. a first arc; 132. a second arc; 21. an upper die; 22. and (5) a lower die.

Detailed Description

Referring to fig. 1-5, the present invention relates to a 3D printer rubber scraper 1, which includes a strip-shaped base 11 and a scraper portion 13 integrally formed at the bottom of the base 11 and extending along the length direction of the base 11, wherein the longitudinal section of the base 11 is a rectangular structure with four corners having chamfers 111, and the width of the scraper portion 13 gradually decreases from the connection with the bottom of the base 11 to the direction away from the bottom of the base 11. 3D printer rubber scraper 1, base member 11 and the scraper portion 13 that integrated into one piece just extends along the length direction of base member 11 in base member 11 bottom including the bar, wherein the longitudinal section of base member 11 on upper portion all is equipped with the rectangle structure of chamfer 111 for four angle ends, the width of scraper portion 13 of lower part is by reducing gradually towards the direction of keeping away from base member 11 bottom junction with base member 11 bottom, wherein rectangle base member 11 supports whole adhesive tape, moreover, the steam generator is simple in structure, high durability and convenient installation, and be favorable to making it reach required installation accuracy easily when the installation because of its large tracts of land. The upper end of the scraper part 13 with the thick upper part and the thin lower part provides a certain supporting force for pushing the powder layer, the thickness, thinness and density of the powder layer can be kept uniform and consistent by the cutting edge formed at the lowest end of the scraper part 13, and the cutting edge part also has an avoiding function when necessary.

And the overall hardness of the 3D printer rubber scraper 1 is Shore A60-65 degrees, so that the required heat resistance, wear resistance and moderate hardness can be ensured, and certain strength is ensured. And if necessary, the blade portion formed at the lowermost end of the scraper portion 13 is made to have a slight escape function.

Moreover, the chamfer 111 of the base body 11 mainly plays a role in beauty and clearance, the relevant clamp can be machined in a mechanical machining mode, and the chamfer 111 on the arc rubber strip of the tool nose can be clearance-avoided; the whole product is beautiful if the chamfer 111 is provided. The both sides of scraper portion longitudinal section are mutual symmetry and toward two first circular arcs 131 that scraper portion center is concave, and the lower extreme of scraper portion longitudinal section is second circular arc 132, wherein the second circular arc is the semicircle, and two endpoints of second circular arc 132 are connected with two first circular arcs 131 respectively.

Also in this particular embodiment, the base 11 need only be designed to meet two requirements: a. the installation can be absolutely stable; b. the installation is convenient. Therefore, in the present embodiment, the shape of the base 11 is a rectangle with the simplest structure, and the shape is most suitable and convenient for installation, too small is inconvenient for clamping by a clamp, and too large is wasteful of glue and wasteful of space in a machine.

Further, a stabilizing part 12 is further arranged between the base body 11 and the scraper part 13, the base body 11, the scraper part 13 and the stabilizing part 12 are all integrally formed, and the maximum width of the scraper part 13 is the same as the width of the stabilizing part 12. In the present application, the clamping portion may further increase the supporting force for pushing the powder layer.

In order to achieve the above purpose, the invention further provides a preparation method of the rubber scraper 1 for the 3D printer, which comprises the following steps:

step 1: cutting the rubber material into strips according to the size and weight required by the die;

step 2: preheating a die and a machine table, and heating to 170 ℃;

and step 3: putting the rubber materials cut into strips into a mold in order, closing the mold, putting the mold into a vulcanizing machine, and carrying out pressurization and exhaust treatment;

and 4, step 4: keeping the rubber material in the mold and the mold in a pressurized state on a vulcanizing machine, and heating to 170 ℃ for vulcanizing for 10 minutes;

and 5: opening the mold and taking out the product;

step 6: and (4) putting the product treated in the step (5) in an oven in order, heating to 230 ℃, and carrying out secondary vulcanization for 24 hours.

And 7: and taking out the product, cooling, deburring, inspecting, packaging and warehousing.

Because the complicated shape (shown in figure 3) is adopted in the prior art, the stability of the base body 11 structure of the comb shape to the installation can not play a good effect, after the base body 11 part is designed into the comb shape, the middle connecting part and the comb teeth are weak, even if the comb teeth can be stably installed in the installation clamp, the scraper part 13 is unstable due to the weak of the connecting part, and then the thickness and the density uniformity of the whole powder paving are influenced. The teeth are configured such that, when installed, each tooth fits into a corresponding tooth slot of the jig. In fact, this is a troublesome and time-consuming matter in the case of such softness and relatively long length.

In addition, complex structures also place higher demands on the processing technology. The product with the structure has two processing technologies which can be selected, one is an extrusion technology, and the other is a die pressing technology. Both of these processes have significant disadvantages.

The product produced by using the extrusion process has the cross section sizes which are different in size at different positions, so that the straightness of the cutting edge part of the scraper is poor, and the cutting edge part of the scraper is not parallel to the mounting position, so that the thickness and the uniformity of powder laying of the product are influenced. And the surface roughness of the product produced by the process is poor, so that the wear resistance of the scraper part 13 of the product is poor, and the powder pushing part is easy to adhere and difficult to remove. When the mould pressing technology is used for production, the mould division mode of the mould pressing technology is required to be the symmetrical mould division mode shown in figure 4 due to the shape of the mould pressing technology.

Since the parting surface of the mould is at the very tip of the scraper portion 13 of the product, the product produced in this way is likely to have some more or less burrs, flashes or other defects, and these small defects will certainly affect the powder spreading effect and thus the quality of the 3D printed product.

In the application, the 3D printer rubber scraper 1 is used as a mold according to the mold splitting mode shown in fig. 5, the mold can completely avoid the mold splitting surface from being at the key part of a product, the integrity of the scraper part 13 can be ensured, and the product can show excellent performance in normal use.

Further, the sizing material in the step 1 comprises the following components in percentage by weight: vinylidene fluoride-hexafluoropropylene copolymer: 0-90% of vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, 0-90% of triphenylphosphine chloride, 0-5% of bisphenol AF0, 0-50% of carbon black, 0-50% of calcium silicate, 0-50% of barium sulfate, 0-10% of calcium hydroxide, 0-10% of magnesium oxide, 0-5% of palm wax, 0-5% of titanium dioxide and 0-5% of iron oxide red.

In the specific embodiment, the sizing material in the step 1 comprises the following components in percentage by weight: 68% of vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, 2% of bisphenol AF, 24% of carbon black, 3% of magnesium oxide, 1% of palm wax, 1% of titanium dioxide and 1% of iron oxide red.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.