阅读说明：本技术 骨科用外固定支架可调式延长接的加工工艺 (Processing technology for adjustable extension joint of external fixing bracket for orthopedics department ) 是由 季国庆 于 2020-12-07 设计创作，主要内容包括：本发明公开了骨科用外固定支架可调式延长接的加工工艺,工艺步骤如下：(1)先将医用级聚醚醚酮放入高温干燥机中干燥,然后保温于高温干燥机中备用；(2)将镶件螺母放入烘箱中烘烤,然后保温于烘箱中备用；(3)将制造延长接上片和下片的两个模具分别安装在注塑机上并调试；(4)注塑成型得到延长接的上片和下片,接着去除上片和下片上的交口、毛刺、飞边；(5)对延长接的上片和下片进行回火处理,以便消除上、下片中的内应力；(6)对延长接的上片和下片进行精加工后进行拼装。上述的加工工艺能使加工得到的延长接的注塑材料充分结晶,使得延长接的致密度显著提高,从而使延长接具有较好的尺寸稳定性。(The invention discloses a processing technology of adjustable extension joint of an external fixing bracket for orthopedics, which comprises the following processing steps: (1) firstly, putting medical grade polyether-ether-ketone into a high-temperature dryer for drying, and then preserving heat in the high-temperature dryer for later use; (2) placing the insert nut into an oven for baking, and then preserving heat in the oven for later use; (3) respectively installing two molds for manufacturing the extension upper sheet and the extension lower sheet on an injection molding machine and debugging; (4) injection molding to obtain an upper piece and a lower piece which are connected in an extending way, and then removing the intersection, the burr and the flash on the upper piece and the lower piece; (5) tempering the upper and lower pieces which are connected in an extending way so as to eliminate internal stress in the upper and lower pieces; (6) and performing finish machining on the upper piece and the lower piece which are connected in an extending way, and then assembling. The processing technology can fully crystallize the injection molding material of the extension joint, so that the density of the extension joint is obviously improved, and the extension joint has better dimensional stability.)

1. The processing technology of the adjustable extension joint of the external fixation bracket for orthopedics is characterized in that: the process comprises the following steps:

(1) firstly, putting medical grade polyether-ether-ketone into a high-temperature dryer to be dried for 4-6 hours at the temperature of 150 +/-10 ℃, and preserving heat in the high-temperature dryer for later use at the temperature of 150 +/-10 ℃ after water is completely removed;

(2) putting the insert nut into an oven, then adjusting the temperature of the oven to 160 +/-10 ℃ for baking for more than 2 hours, and then keeping the temperature of 160 +/-10 ℃ in the oven for later use;

(3) respectively installing two dies for manufacturing the extension upper piece and the lower piece on an injection molding machine and debugging the two dies to enable the two dies to be located at required positions, and then adjusting the temperature of the dies to enable the temperature of the two dies to be 180-220 ℃;

(4) adding the standby medical-grade polyether-ether-ketone into an injection molding machine for melting, placing a standby insert nut on an insert position of a mold corresponding to the upper piece, then respectively injecting the melted medical-grade polyether-ether-ketone into the two molds by the injection molding machine, thus obtaining the upper piece and the lower piece which are connected in an extending way by injection molding, and then removing the intersection, the burr and the flash on the upper piece and the lower piece;

(5) tempering the upper and lower pieces to eliminate internal stress, the tempering step is: a. placing the upper piece and the lower piece into a heat treatment furnace; b. heating the heat treatment furnace from room temperature to 150 +/-2 ℃; c. the temperature of the heat treatment furnace is increased by 10 ℃ every 2 hours until the temperature is increased to 230 +/-2 ℃; d. keeping the temperature at 230 +/-2 ℃ for 2 hours; e. regulating the temperature of the heat treatment furnace to 10 ℃ every 1 hour until the temperature is reduced to 150 +/-2 ℃, and naturally cooling the upper piece and the lower piece to room temperature;

(6) and (4) performing finish machining on the upper piece and the lower piece which are connected in an extending way, and then assembling, thereby obtaining the extension joint with adjustable length.

2. The adjustable extension joint processing technology of the external fixation bracket for orthopedics department according to claim 1, characterized in that: the medical polyether-ether-ketone is composed of 78-82% of polyether-ether-ketone and 18-22% of carbon fiber.

3. The adjustable extension joint processing technology of the external fixation bracket for orthopedics department according to claim 1, characterized in that: the medical grade polyetheretherketone is a polyetheretherketone product manufactured by Wegeners corporation of England under the trade name PEEK-CA 20.

4. The process for processing the adjustable extension joint of the external fixation bracket for orthopedics department according to claim 1, 2 or 3, which is characterized in that: five heating sections with equal length are arranged between a feeding port and a discharging port of the injection molding machine, the temperature of the first heating section is 375 +/-2 ℃, the temperature of the second heating section is 380 +/-2 ℃, the temperature of the third heating section is 385 +/-2 ℃, the temperature of the fourth heating section is 380 +/-2 ℃, the temperature of the fifth heating section is 375 +/-2 ℃, materials are conveyed by a screw rod in the injection molding machine and are fed from the feeding port, then the materials sequentially pass through the five heating sections at a constant speed, and finally the materials are conveyed out of the discharging port to a mold.

Technical Field

The invention relates to the field of injection molding processing, in particular to a processing technology of adjustable extension joint of an external fixing bracket for orthopedics.

Background

The adjustable extension joint for the external fixing bracket for orthopedics department is formed by assembling an upper piece and a lower piece, the extension joint can adjust the length by the relative sliding of the upper piece and the lower piece, the upper piece and the lower piece are locked by a bolt and a nut after the position adjustment is finished, the original processing technology of the extension joint cannot fully crystallize the injection molding material of the extension joint, the density of the extension joint is not high, and the dimensional stability of the extension joint is poor.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides a processing technique of the adjustable extension joint of the external fixation bracket for orthopedics which can lead the processed extension joint to have better dimensional stability.

In order to solve the problems, the technical scheme adopted by the invention is as follows: the processing technology of the adjustable extension joint of the external fixation bracket for orthopedics is characterized in that: the process comprises the following steps:

(1) firstly, putting medical grade polyether-ether-ketone into a high-temperature dryer to be dried for 4-6 hours at the temperature of 150 +/-10 ℃, and preserving heat in the high-temperature dryer for later use at the temperature of 150 +/-10 ℃ after water is completely removed;

(2) putting the insert nut into an oven, then adjusting the temperature of the oven to 160 +/-10 ℃ for baking for more than 2 hours, and then keeping the temperature of 160 +/-10 ℃ in the oven for later use;

(3) respectively installing two dies for manufacturing the extension upper piece and the lower piece on an injection molding machine and debugging the two dies to enable the two dies to be located at required positions, and then adjusting the temperature of the dies to enable the temperature of the two dies to be 180-220 ℃;

(4) adding the standby medical-grade polyether-ether-ketone into an injection molding machine for melting, placing a standby insert nut on an insert position of a mold corresponding to the upper piece, then respectively injecting the melted medical-grade polyether-ether-ketone into the two molds by the injection molding machine, thus obtaining the upper piece and the lower piece which are connected in an extending way by injection molding, and then removing the intersection, the burr and the flash on the upper piece and the lower piece;

(5) tempering the upper and lower pieces to eliminate internal stress, the tempering step is: a. placing the upper piece and the lower piece into a heat treatment furnace; b. heating the heat treatment furnace from room temperature to 150 +/-2 ℃; c. the temperature of the heat treatment furnace is increased by 10 ℃ every 2 hours until the temperature is increased to 230 +/-2 ℃; d. keeping the temperature at 230 +/-2 ℃ for 2 hours; e. regulating the temperature of the heat treatment furnace to 10 ℃ every 1 hour until the temperature is reduced to 150 +/-2 ℃, and naturally cooling the upper piece and the lower piece to room temperature;

(6) and (4) performing finish machining on the upper piece and the lower piece which are connected in an extending way, and then assembling, thereby obtaining the extension joint with adjustable length.

Further, the processing technology of the adjustable extension joint of the external fixation bracket for orthopedics department comprises the following steps: the medical polyether-ether-ketone is composed of 78-82% of polyether-ether-ketone and 18-22% of carbon fiber.

Further, the processing technology of the adjustable extension joint of the external fixation bracket for orthopedics department comprises the following steps: the medical grade polyetheretherketone is a polyetheretherketone product manufactured by Wegeners corporation of England under the trade name PEEK-CA 20.

Further, the processing technology of the adjustable extension joint of the external fixation bracket for orthopedics department comprises the following steps: five heating sections with equal length are arranged between a feeding port and a discharging port of the injection molding machine, the temperature of the first heating section is 375 +/-2 ℃, the temperature of the second heating section is 380 +/-2 ℃, the temperature of the third heating section is 385 +/-2 ℃, the temperature of the fourth heating section is 380 +/-2 ℃, the temperature of the fifth heating section is 375 +/-2 ℃, materials are conveyed by a screw rod in the injection molding machine and are fed from the feeding port, then the materials sequentially pass through the five heating sections at a constant speed, and finally the materials are conveyed out of the discharging port to a mold.

The invention has the advantages that: the processing technology of the adjustable extension joint of the external fixing bracket for orthopedics enables the injection molding material of the extension joint obtained by processing to be fully crystallized, so that the density of the extension joint is obviously improved, and the extension joint has better dimensional stability.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

The adjustable extension joint processing technology of the external fixation bracket for orthopedics comprises the following processing steps:

(1) firstly, putting medical grade polyether-ether-ketone into a high-temperature dryer to be dried for 4-6 hours at the temperature of 150 +/-10 ℃, and preserving heat in the high-temperature dryer for later use at the temperature of 150 +/-10 ℃ after water is completely removed; the medical polyether-ether-ketone is composed of 78-82% by weight of polyether-ether-ketone and 18-22% by weight of carbon fiber;

(2) putting the insert nut into an oven, then adjusting the temperature of the oven to 160 +/-10 ℃ for baking for more than 2 hours, and then keeping the temperature of 160 +/-10 ℃ in the oven for later use;

(3) respectively installing two dies for manufacturing the extension upper piece and the lower piece on an injection molding machine and debugging the two dies to enable the two dies to be located at required positions, and then adjusting the temperature of the dies to enable the temperature of the two dies to be 180-220 ℃;

(4) adding the standby medical-grade polyether-ether-ketone into an injection molding machine for melting, placing a standby insert nut on an insert position of a mold corresponding to the upper piece, then respectively injecting the melted medical-grade polyether-ether-ketone into the two molds by the injection molding machine, thus obtaining the upper piece and the lower piece which are connected in an extending way by injection molding, and then removing the intersection, the burr and the flash on the upper piece and the lower piece; the nut is not embedded in the original upper sheet connected in an extending mode, but in the embodiment, the nut is embedded in the upper sheet for convenience, and the adhesion force of the nut in the upper sheet is enhanced in a baking mode, so that the nut cannot loosen;

(5) tempering the upper and lower pieces which are connected in an extending way, wherein the tempering adopts a mode of gradually rising and reducing temperature in different periods so as to eliminate the internal stress in the upper and lower pieces, and the tempering comprises the following steps: a. placing the upper piece and the lower piece into a heat treatment furnace; b. heating the heat treatment furnace from room temperature to 150 +/-2 ℃; c. the temperature of the heat treatment furnace is increased by 10 ℃ every 2 hours until the temperature is increased to 230 +/-2 ℃; d. keeping the temperature at 230 +/-2 ℃ for 2 hours; e. regulating the temperature of the heat treatment furnace to 10 ℃ every 1 hour until the temperature is reduced to 150 +/-2 ℃, and naturally cooling the upper piece and the lower piece to room temperature;

(6) and (4) performing finish machining on the upper piece and the lower piece which are connected in an extending way, and then assembling, thereby obtaining the extension joint with adjustable length.

In this example, polyetheretherketone medical grade is manufactured by the Wegeners company of England under the trademark PEEK-CA 20.

In this embodiment, five heating sections with equal length are arranged between a feeding port and a discharging port of an injection molding machine, the temperature of the first heating section is 375 ± 2 ℃, the temperature of the second heating section is 380 ± 2 ℃, the temperature of the third heating section is 385 ± 2 ℃, the temperature of the fourth heating section is 380 ± 2 ℃, the temperature of the fifth heating section is 375 ± 2 ℃, the material is conveyed by a screw in the injection molding machine and is fed from the feeding port, then sequentially passes through the five heating sections at a constant speed, and finally is conveyed out from the discharging port to a mold.