CN1659025A - 滑动性等机械强度好的树脂覆盖钢管 - Google Patents

滑动性等机械强度好的树脂覆盖钢管 Download PDF

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CN1659025A
CN1659025A CN03813523XA CN03813523A CN1659025A CN 1659025 A CN1659025 A CN 1659025A CN 03813523X A CN03813523X A CN 03813523XA CN 03813523 A CN03813523 A CN 03813523A CN 1659025 A CN1659025 A CN 1659025A
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CN100374289C (zh
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吉野周次
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Yazaki Kako Corp
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Abstract

通过大幅度地提高结晶性工程塑料(4)对于薄壁钢管(2)的粘结性，提供一种不会剥离的滑动性等机械强度好的树脂覆盖钢管(1)。用粘结剂将苯乙烯系树脂与结晶性工程塑料的混合体的合金化树脂(3)粘结覆盖在薄壁钢管(2)的外周面上，并且在上述覆盖树脂(3)的外周面上形成有断面沿管轴方向均等的双重覆盖结构，所述双重覆盖结构通过以为了发挥上述滑动性等机械强度所必要的壁厚覆盖上述结晶性工程塑料(4)形成。

Description

滑动性等机械强度好的树脂覆盖钢管
技术领域
本发明属于将滑动性等机械强度或耐热性非常好的结晶性工程塑料作为外层覆盖树脂使用的滑动性等机械强度好的树脂覆盖钢管技术领域，更详细地说，涉及一种通过大幅度地提高结晶性工程塑料对钢管的粘结性，能够适用于轻、中型载荷用的驱动辊式输送机等的花键轴的滑动性等机械强度好的树脂覆盖钢管。
背景技术
PBT(聚丁烯对苯二酸脂)树脂或尼龙树脂等结晶性工程塑料由于滑动性等机械强度或耐热性非常好，因此如果能够用于树脂覆盖钢管的外层覆盖树脂的话，则能够实现滑动性、进而耐用性好的树脂覆盖钢管，因此可以很大地期待其效果，社会需求很大。可以说最适用于例如图6所示那样的用于轻、中型载荷的驱动辊式输送机的花键轴1等要求具有良好的滑动性的构件。
但是，以往在将上述结晶性工程塑料用于树脂覆盖钢管的外层覆盖树脂时，没有能够将结晶性工程塑料良好地粘结到薄壁钢管上去的粘结剂，只有将变性聚烯烃系粘结性聚合物薄薄地覆盖在薄壁钢管上，在其表面粘结覆盖该结晶性工程塑料。
但是，用上述粘结性聚合物将结晶性工程塑料粘结覆盖到薄壁钢管上形成的树脂覆盖钢管在薄壁钢管与粘结性聚合物的界面之间容易渗入水，存在覆盖树脂(结晶性工程塑料)剥离这样的问题。特别是在室外或农业、水产业领域使用时，由于水渗透的机会多，因此更加助长了覆盖树脂的剥离，处于容易剥离的状态，实用性差。
并且，由于上述结晶性工程塑料虽然滑动性等机械强度或耐热性好，但熔融粘度低、收缩率大，因此存在尺寸精度低或成型形状的稳定性差、制造效率差的问题。
而且，由于结晶性工程塑料本身的原料昂贵，因此不经济，存在至少希望尽量薄地覆盖以减少昂贵的树脂的使用量的现状。
如上所述，将结晶性工程塑料用于树脂覆盖钢管的外层覆盖树脂极其困难，还没有达到实用的程度。
因此，目前的现状是用能够使用橡胶系粘结剂的AAS、ABS、AES、PETG等合成树脂形成树脂覆盖钢管的外层覆盖树脂，所述橡胶系粘结剂虽然滑动性等机械强度或耐热性比结晶性工程塑料差，但与薄壁钢管的粘结界面的耐水性好，不会产生剥离。
发明内容
本发明的第一个目的就是要通过大幅度地提高结晶性工程塑料对薄壁钢管的粘结性，提供一种不会剥离的、滑动性等机械强度好的树脂覆盖钢管。
本发明的第二个目的是试图提高制造效率，提供一种经济性高、滑动性等机械强度好的树脂覆盖钢管。
为了到达上述目的，本发明的第一方案的滑动性等机械强度树脂覆盖钢管的特征在于，用粘结剂将苯乙烯系树脂与结晶性工程塑料的混合体的合金化树脂(3)粘结覆盖在薄壁钢管(2)的外周面上，并且在上述覆盖树脂(3)的外周面上形成有断面沿管轴方向均等的双重覆盖结构，所述双重覆盖结构通过以为了发挥其滑动性等机械强度所必要的壁厚覆盖上述结晶性工程塑料(4)形成。
第二方案的特征在于，在第一方案的滑动性等机械强度好的树脂覆盖钢管中，苯乙烯系树脂(3)为从AAS树脂、ABS树脂和AES树脂中选择的一种树脂，结晶性工程塑料(4)为从PBT树脂、尼龙树脂和聚缩醛树脂中选择的一种树脂。
第三方案的滑动性等机械强度好的树脂覆盖钢管的特征在于，在第一或第二方案的滑动性等机械强度好的树脂覆盖钢管(1)中，薄壁钢管(2)为圆形截面；合金化树脂(3)在上述薄壁钢管(2)的外周面的圆周方向交错地形成凹部(3a)和凸部(3b)，并且沿管轴的方向粘结覆盖有上述凹凸部(3a、3b)连续的凹凸条(3a、3b)，使它们的截面均等，在上述凸条部(3b)的外周面上沿管轴方向形成有能够收容使覆盖的结晶性工程塑料(4)发挥滑动性等机械强度所必要的壁厚及宽度的沟槽部(3c)；结晶性工程塑料(4)形成为在上述合金化树脂(3)的外周面上，覆盖在该合金化树脂(3)的凸条部(3b)上设置的沟槽部(3c)上的厚，覆盖在其他部分上的薄，整体为花键形状。
附图说明
图lA表示了本发明的滑动性等机械强度好的树脂覆盖钢管的透视图
图1B上图的剖视图
图1C图1B的X部分的放大图
图2表示十字冲模式挤压成型机的主要部分的正视图
图3图2的III-III线剖视图
图4A表示了内层树脂覆盖模环的正视图
图4B图4A的IV-IV线剖视图
图5A表示了外层树脂覆盖模环的正视图
图5B图5A的V-V线剖视图
图6本发明的滑动性等机械强度好的树脂覆盖钢管的使用状态的示例的参考图
具体实施方式
图1A～C表示了第一方案的滑动性等机械强度好的树脂覆盖钢管1的实施形态。该滑动性等机械强度好的树脂覆盖钢管1适用于例如要求良好的滑动性的轻、中型载荷用的驱动辊式输送机等使用的花键轴。
但是，树脂的合金化不仅可以实现单体不能得到的优良功能或性能，而且以往就开始进行，最近使用相溶化剂使相溶性差的树脂之间也合金化的树脂已经上市，即使是苯乙烯系的树脂也与各种各样的树脂合金化，并已上市。因此，关注苯乙烯系树脂与结晶性工程塑料的混合体的合金化树脂3，其与钢管2的表面的粘结力由能够与合金化树脂3中所含的苯乙烯系树脂粘结的橡胶系粘结剂的粘结力确保，再由与成为外层的结晶性工程塑料4的相溶性而一体化，由此能够将结晶性工程塑料4覆盖到外层上。根据这样的考虑，上述树脂覆盖钢管1不仅立足于大幅度地提高结晶性工程塑料4对于薄壁钢管2的粘结性的技术思想，而且立足于尽量降低昂贵的结晶性工程塑料4的使用量，并有效地发挥滑动性等机械强度的技术思想。
上述树脂覆盖钢管1在外径为26mm左右、断面为圆形的薄壁钢管2的外周面上涂敷橡胶系粘结剂，其表面粘结覆盖有合金化树脂3。该合金化树脂3由苯乙烯系树脂的AAS树脂和属于结晶工程塑料的PBT树脂构成。
在上述合金化树脂3的外周面形成有断面沿管轴方向均等的双重覆盖结构，所述双重覆盖结构通过以为了发挥其滑动性等机械强度所必要的壁厚覆盖了与构成该合金化树脂3的结晶性工程塑料相同的树脂即PBT树脂4而形成(第一方案的发明)。
上述合金化树脂3为包含20％的PBT树脂的AAS树脂的合金化聚合物，在上述薄壁钢管2的外周面的圆周方向交错地形成凹部和凸部，并且沿管轴的方向粘结覆盖有上述凹凸部连续的凹凸条3a、3b，使它们的截面均等，在共计6个地方设置的凸条部3b上，沿管轴方向分别形成有能够收容使覆盖在其表面上的PBT树脂4发挥滑动性等机械强度所必要的壁厚(0.5mm左右)及宽度(4mm左右)的沟槽部3c。
上述PBT树脂4覆盖在上述合金化树脂3的外周面上，与合金化树脂3成为一体，覆盖在该合金化树脂3的凸条部3b上设置的沟槽部3c上的壁厚厚(0.8mm左右)，覆盖在其他的凸条部3b上的壁厚薄(0.3mm左右)，覆盖在凹条部3a上的壁厚更薄(0.1mm左右)(第三方案的发明)。
另外，构成上述合金化树脂3的苯乙烯系树脂并不局限于AAS树脂，用ABS树脂、AES树脂也可以大致相同地实施。上述结晶性工程塑料4也不局限于PBT树脂4，尼龙树脂、聚缩醛树脂也可以大致相同地实施(第二方案的发明)。即，只要存在包含希望覆盖的结晶性工程塑料的苯乙烯系合金化树脂，就能够实施覆盖了想覆盖的结晶性工程塑料的树脂覆盖钢管。
并且，虽然在本实施形态中在管体的圆周方向以近似相等的间隔实施了6个上述凸条部3b，但凸条部3b的个数并不局限于此。而且，虽然在本实施形态中以花键形状(轴)实施树脂覆盖钢管1，但并不局限于此，当然也可以形成为圆筒状实施。
上述PBT树脂4在上述凸条部3b的横断面形状的近似中央的部位具有厚壁。其理由是一方面考虑到尽可能地降低昂贵的结晶性工程塑料4使用量，同时有效地发挥滑动性等机械强度，另一方面是考虑到当将本实施形态的树脂覆盖钢管1用于花键轴时，嵌合到轴承内的上述凸条部3b的大体中央部位最容易滑动，容易磨损。并且，由于使上述PBT树脂4的壁厚成为可能的合金化树脂3的沟槽部3c用沟槽部3c两侧的沟壁约束被挤压的PBT树脂4，因此即使是熔融粘度低、难以保持形状的PBT树脂4也能够稳定地保持凹凸形状地制造。
具体为，在图1的示例中，上述薄壁钢管2使用壁厚不到1mm左右、外径为26mm左右的大小。使上述合金化树脂3的凹条部3a的厚度为0.5mm左右，凸条部3b的厚度为1.2mm左右，沟槽部3c的宽度为4mm左右、槽壁为0.5mm左右。上述PBT树脂4壁厚厚的部位即在沟槽部3c上为0.8mm左右，在其他的凸条部3b上即壁厚薄的部位为0.3mm左右，在凹条部3a上为0.1mm左右。因此，挤压成型整体外径在凸条部3b上为29mm左右、在凹条部3a上为27.2mm左右的花键形状的树脂覆盖钢管1。
因此，如果采用上述滑动性等机械强度好的树脂覆盖钢管1，(1)由于通过具有相溶性的上述合金化树脂3向薄壁钢管2覆盖PBT树脂(结晶性工程塑料)4，并一体化实施，因此与上述薄壁钢管2具有足够的粘结力，不必担心覆盖的PBT树脂4剥离。(2)由于熔融粘度低、难以保持形状的PBT树脂4以被上述合金化树脂3的沟槽部3c的两侧的槽壁约束的形态被挤压，因此形状稳定，能够大幅度地提高制造效率。(3)由于将昂贵的结晶性工程塑料4的使用量限制在发挥滑动性所必需的量实施，因此能够降低制造单价，比较经济。
下面根据图2及其后的附图说明制造上述结构的滑动性等机械强度好的树脂覆盖钢管1的挤压成型方法的实施形态。
图2和图3表示上述挤压成形方法的实施中使用的十字冲模型挤压成型机。图3中的符号10是指挤压成型机的主要部分即十字冲模的覆盖模环的结构。基本结构与本申请人已经取得的日本专利第2867244号公报所记载的挤压成型机大致相同。
即，在该挤压成型机中，分配隔片14和内层树脂覆盖模环15通过分配板12设置在安装于图示省略掉的十字冲模的顶端的连接器11的顶端，放射状分配隔片16和外层树脂覆盖模环17通过分配板13设置在其更顶端，该分配板12、13互相抵接固定。上述分配板12、13的切线的上部连接着连接有加热缸体的联轴节20，用内层树脂覆盖模环15将来自十字冲模的上述合金化树脂3粘结覆盖在薄壁钢管2的外周面上，接着，用上述外层树脂覆盖模环17将来自加热缸体的PBT树脂4覆盖到上述合金化树脂3的外周面上。
从上述联轴节20到上述外层树脂覆盖模环17的PBT树脂(结晶性工程塑料)4的流路为，以薄壁钢管2为中心的大的半圆状的第1流路18的分开的两端与内侧的小直径的第2流路19、19相连。上述第2流路19、19的形状为流路19、19之间的连接部收缩，以便以向中心均匀地挤压。
上述第2流路19、19连接着从放射状分配隔片16的形成为放射状的流路到外层树脂覆盖模环17的通孔17a、17b(参照图5)。
如图4A、B所示，上述内层树脂覆盖模环15由通孔15a、15b、15c构成，通孔15a与覆盖的合金化树脂3的凹条部3a相对应，通孔15c与上述合金化树脂3的沟槽部3c相对应，通孔15c及其两侧的通孔15b、15b与上述合金化树脂3的凸条部3b相对应。
如图5A、B所示，为了将PBT树脂4覆盖到上述合金化树脂3上，外层树脂覆盖模环17形成有能够以覆盖以上述内层树脂覆盖模环15的通孔15c为中心的相邻的通孔15b、15b的宽度的配置覆盖壁厚厚的PBT树脂4的通孔17a，以及能够覆盖与上述通孔15a相对应的壁厚薄的PBT树脂4的通孔17b。
在用上述成型机挤压成型滑动性等机械强度好的树脂覆盖钢管1时，首先，使薄壁钢管2从图示省略掉的十字冲模向右前进，粘结覆盖向连接器11、分配隔片14和内层树脂覆盖模环15供给的合金化树脂3。
接着，当上述薄壁钢管2到达外层树脂覆盖模环17时，从联轴节20经过第1流路18和第2流路19流过放射状分配隔片16，然后从上述内层树脂覆盖模环15与外层树脂覆盖模环17之间的间隙提供给通孔17a、17b的PBT树脂4覆盖到上述合金化树脂3的外周面上，加强其形状。这样一来，如图1所示那样，树脂覆盖钢管1被挤压成为以内层为合金化树脂3、外层为PBT树脂4的花键形状，形成断面沿管轴方向均等的双重覆盖结构。
以上根据附图说明了实施形态，但本发明并不局限于图示例的实施形态，在不脱离其技术思想的范围内，从业者通常进行设计变更、应用变型。
如果采用本发明的滑动性等机械强度好的树脂覆盖钢管，由于夹着与该结晶性工程塑料具有相溶性的合金化树脂粘结覆盖结晶性工程塑料来实施，因此与钢管具有足够的粘结力，不必担心覆盖的结晶性工程塑料剥离。并且，由于熔融粘度低、难以保持形状的PBT树脂以被合金化树脂的沟槽部的两侧的槽壁约束的形态被挤压，因此形状稳定，能够飞跃地提高制造效率。而且，由于将昂贵的结晶性工程塑料的使用量限制在发挥滑动性所必需的量实施，因此能够降低制造单价，比较经济。

Claims (3)

1.一种滑动性等机械强度好的树脂覆盖钢管，其特征在于，用粘结剂将苯乙烯系树脂与结晶性工程塑料的混合体的合金化树脂粘结覆盖在薄壁钢管的外周面上，并且在上述覆盖树脂的外周面上形成有断面沿管轴方向均等的双重覆盖结构，所述双重覆盖结构通过以为了发挥其滑动性等机械强度所必要的壁厚覆盖上述结晶性工程塑料而形成。
2.如权利要求1所述的滑动性等机械强度好的树脂覆盖钢管，其特征在于，苯乙烯系树脂为从AAS树脂、ABS树脂和AES树脂中选择的一种树脂，结晶性工程塑料为从PBT树脂、尼龙树脂和聚缩醛树脂中选择的一种树脂。
3.如权利要求1或2所述的滑动性等机械强度好的树脂覆盖钢管，其特征在于，薄壁钢管为圆形截面；合金化树脂在上述薄壁钢管的外周面的圆周方向交错地形成凹部和凸部，并且沿管轴的方向截面均等地粘结覆盖有上述凹凸部连续的凹凸条，在上述凸条部的外周面上沿管轴方向形成有能够收容使覆盖的结晶性工程塑料发挥滑动性等机械强度所必要的壁厚及宽度的沟槽部；结晶性工程塑料在上述合金化树脂的外周面上，覆盖在该合金化树脂的凸条部上设置的沟槽部上的厚，覆盖在其他部分上的薄，整体为花键形状。
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