阅读说明：本技术 一种ptfe空心球加工方法 (PTFE hollow sphere processing method ) 是由 黄小华 于 2021-08-05 设计创作，主要内容包括：本发明公开了一种PTFE空心球加工方法,通过A成型模具成型A弧形球壳,通过B成型模具成型B弧形球壳,A弧形球壳与B弧形球壳均设有对接耳,A弧形球壳的弧度小于半球,B弧形球壳的弧度大于半球；将A弧形球壳、B弧形球壳放入烤炉烧结；在烧结后的将A弧形球壳、B弧形球壳的弧顶处打孔；将打孔后的A弧形球壳、B弧形球壳的对接耳紧密对接,然后放入自融合模具的模腔中,放入烤炉继续烧结,烧结完毕后冷却得到PTFE空心球半成品；将PTFE空心球半成品装夹到数控车床的装夹抓盘中,车削对接耳处形成融合凸圈,使PTFE空心球外表面成为完美的球面,得到PTFE空心球成品。本发明便于装夹加工,而且设置排气口,良品率高。(The invention discloses a PTFE hollow sphere processing method, wherein an A arc-shaped spherical shell is formed through an A forming die, a B arc-shaped spherical shell is formed through a B forming die, butt-joint lugs are arranged on the A arc-shaped spherical shell and the B arc-shaped spherical shell, the radian of the A arc-shaped spherical shell is smaller than that of a hemisphere, and the radian of the B arc-shaped spherical shell is larger than that of the hemisphere; putting the arc-shaped spherical shell A and the arc-shaped spherical shell B into an oven for sintering; punching holes at the arc tops of the arc-shaped spherical shell A and the arc-shaped spherical shell B after sintering; tightly butting the butting lugs of the arc-shaped spherical shell A and the arc-shaped spherical shell B after punching, then placing the arc-shaped spherical shell A and the arc-shaped spherical shell B into a die cavity of a self-fusion die, placing the self-fusion die into an oven for continuous sintering, and cooling after sintering to obtain a PTFE hollow sphere semi-finished product; and (3) clamping the PTFE hollow sphere semi-finished product into a clamping grab disk of a numerical control lathe, and turning the butt joint lugs to form a fusion convex ring, so that the outer surface of the PTFE hollow sphere becomes a perfect spherical surface, and thus the PTFE hollow sphere finished product is obtained. The invention is convenient for clamping and processing, and has high yield due to the arrangement of the exhaust port.)

1. A PTFE hollow sphere processing method is characterized by comprising the following steps:

step 1, forming an arc-shaped spherical shell A through a forming die A, forming an arc-shaped spherical shell B through a forming die B, wherein the arc-shaped spherical shell A and the arc-shaped spherical shell B are both provided with butt-joint lugs, the radian of the arc-shaped spherical shell A is smaller than that of a hemisphere, and the radian of the arc-shaped spherical shell B is larger than that of the hemisphere;

step 2, putting the arc-shaped spherical shell A and the arc-shaped spherical shell B into an oven for sintering;

step 3, punching holes at the arc tops of the arc-shaped spherical shell A and the arc-shaped spherical shell B after sintering;

step 4, tightly butting the butting lugs of the arc-shaped spherical shell A and the arc-shaped spherical shell B after punching, then placing the arc-shaped spherical shell A and the arc-shaped spherical shell B into a die cavity of a self-fusion die, placing the self-fusion die into an oven for continuous sintering, and cooling after sintering to obtain a PTFE hollow sphere semi-finished product;

and 5, clamping the PTFE hollow sphere semi-finished product into a clamping grab disk of a numerically controlled lathe, and turning the butt joint lugs to form a fusion convex ring, so that the outer surface of the PTFE hollow sphere becomes a perfect spherical surface, and thus the finished product of the PTFE hollow sphere is obtained.

2. The method for processing the PTFE hollow sphere according to claim 1, wherein the self-fusion mold comprises a self-fusion upper mold and a self-fusion lower mold which are locked by bolts to form a spherical mold cavity, and the arc tops of the self-fusion upper mold and the self-fusion lower mold are provided with vent holes.

3. The processing method of the PTFE hollow sphere according to claim 1, wherein the clamping grabbing disc is a six-claw grabbing disc, a hemispherical clamping cavity is formed after the center of the clamping grabbing disc is folded, and the larger side of the fused PTFE hollow sphere semi-finished product is clamped.

Technical Field

The invention relates to the technical field of hollow sphere processing, in particular to a PTFE hollow sphere processing method.

Background

The PTFE hollow ball is widely used in a sealed valve, generally adopts mold injection molding or extrusion molding, the injection molding needs to process the hollow ball, and the mold and equipment are complex; the extrusion molding method is to put a round pipe with a certain length into a mold and form a hollow ball by extrusion molding.

CN105965922A discloses a PTFE hollow sphere processing technology, firstly, two groups of hemispherical molds are manufactured, each group of hemispherical molds comprises a hemispherical male mold and a hemispherical female mold, PTFE raw materials are poured into the hemispherical molds for compression molding to obtain two PTFE hemispherical shells, the hemispherical male molds are dismantled, then the two PTFE hemispherical shells and the hemispherical female molds are together transferred into an oven, the two PTFE hemispherical shells are aligned in the front, pressure is applied to the hemispherical female molds for heating, the PTFE hemispherical shells are butted under the pressure condition to form a PTFE hollow sphere semi-finished product, the hemispherical female molds are dismantled after cooling, the PTFE hollow sphere semi-finished product is placed into a numerical control lathe for processing, and a complete PTFE hollow sphere finished product is formed. In the production practice, the butt joint of the PTFE hollow spheres is located on the diameter, so that the PTFE hollow spheres are inconvenient to clamp and process; in addition, in the heating process, because the internal gas can not be discharged, irregular shrinkage is easy to occur in the self-fusion process.

Disclosure of Invention

In order to solve the technical problems, the invention provides a PTFE hollow sphere processing method, the surface formed by the butt joint coil line of two PTFE arc-shaped spherical shells does not pass through the spherical center of the PTFE hollow sphere, the clamping processing is convenient, and the top of the PTFE arc-shaped spherical shell is provided with an exhaust port, so that the yield is high.

The invention provides the following technical scheme: a PTFE hollow sphere processing method comprises the following steps:

step 1, forming an arc-shaped spherical shell A through a forming die A, forming an arc-shaped spherical shell B through a forming die B, wherein the arc-shaped spherical shell A and the arc-shaped spherical shell B are both provided with butt-joint lugs, the radian of the arc-shaped spherical shell A is smaller than that of a hemisphere, and the radian of the arc-shaped spherical shell B is larger than that of the hemisphere;

step 2, putting the arc-shaped spherical shell A and the arc-shaped spherical shell B into an oven for sintering;

step 3, punching holes at the arc tops of the arc-shaped spherical shell A and the arc-shaped spherical shell B after sintering;

step 4, tightly butting the butting lugs of the arc-shaped spherical shell A and the arc-shaped spherical shell B after punching, then placing the arc-shaped spherical shell A and the arc-shaped spherical shell B into a die cavity of a self-fusion die, placing the self-fusion die into an oven for continuous sintering, and cooling after sintering to obtain a PTFE hollow sphere semi-finished product;

and 5, clamping the PTFE hollow sphere semi-finished product into a clamping grab disk of a numerically controlled lathe, and turning the butt joint lugs to form a fusion convex ring, so that the outer surface of the PTFE hollow sphere becomes a perfect spherical surface, and thus the finished product of the PTFE hollow sphere is obtained.

Preferably, the self-fusing mold comprises a self-fusing upper mold and a self-fusing lower mold, the self-fusing upper mold and the self-fusing lower mold form a spherical mold cavity after being locked by bolts, and the arc tops of the self-fusing upper mold and the self-fusing lower mold are provided with exhaust holes.

Preferably, the clamping grabbing disc is a six-claw grabbing disc, a hemispherical clamping cavity is formed in the center of the clamping grabbing disc after the clamping grabbing disc is folded, and the larger side of the fused PTFE hollow sphere semi-finished product is clamped. Thus, the clamping and the turning are convenient.

The invention has the beneficial effects that: the face that the butt joint circle line of two PTFE arc spherical shells formed does not pass through PTFE clean shot centre of sphere, and the clamping processing of being convenient for sets up the gas vent at PTFE arc spherical shell top moreover, and the yields is high.

Drawings

Fig. 1 is a schematic diagram of the butt joint of hollow spheres.

Fig. 2 is a schematic view of a self-fusing mold.

Fig. 3 is a schematic view of the clamping.

In the figure, 1-A arc spherical shell, 2-B arc spherical shell, 3-hole, 4-self-fusion upper die, 5-self-fusion lower die and 6-clamping catch tray.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

A PTFE hollow sphere processing method comprises the following steps:

step 1, forming an A arc-shaped spherical shell 1 through an A forming die, forming a B arc-shaped spherical shell 2 through a B forming die, wherein the A arc-shaped spherical shell 1 and the B arc-shaped spherical shell 2 are both provided with butt-joint lugs, the radian of the A arc-shaped spherical shell 1 is smaller than that of a hemisphere, and the radian of the B arc-shaped spherical shell 2 is larger than that of the hemisphere;

step 2, putting the arc-shaped spherical shell 1A and the arc-shaped spherical shell 2B into an oven for sintering;

step 3, punching 3 at the arc top of the arc-shaped spherical shell 1A and the arc top of the arc-shaped spherical shell 2B after sintering;

step 4, tightly butting the butting lugs of the arc-shaped spherical shell A1 and the arc-shaped spherical shell B2 after punching (as shown in figure 1), then placing the arc-shaped spherical shell A and the arc-shaped spherical shell B into a die cavity of a self-fusing die (as shown in figure 2), wherein the self-fusing die comprises a self-fusing upper die 4 and a self-fusing lower die 5 which are locked by bolts to form a spherical die cavity, the arc tops of the self-fusing upper die 4 and the self-fusing lower die 5 are both provided with exhaust holes, after the self-fusing upper die and the self-fusing lower die are installed, placing the self-fusing die into an oven for continuous sintering, and cooling after sintering to obtain a PTFE hollow sphere semi-finished product; the surface formed by the butt-joint coil wire needing to be processed in the PTFE hollow ball semi-finished product does not pass through the spherical center of the PTFE hollow ball.

And 5, clamping the PTFE hollow sphere semi-finished product into a clamping and grabbing disc 6 of a numerically controlled lathe (shown in figure 3), wherein the clamping and grabbing disc 6 is a six-claw grabbing disc, a hemispherical clamping cavity is formed after the center is folded, the larger side (B arc-shaped spherical shell 2) of the fused PTFE hollow sphere semi-finished product is clamped, and a fusion convex ring is formed at the butt joint lug by turning, so that the outer surface of the PTFE hollow sphere becomes a perfect spherical surface, and the finished PTFE hollow sphere is obtained.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.