TWI548475B - Method for working nuts - Google Patents

Description

Nut processing method

The present invention relates to a method of processing a nut.

The ball screw system is a device widely used in many mechanical devices. The purpose of the ball screw system is to provide a precise transmission function, which can achieve linear motion in mechanical operation, and then operate the loaded machine table or object in a linear direction. The ball screw mainly comprises a screw, a nut and a plurality of balls, the ball is received in the nut, and the nut is sleeved on the screw, so that the nut and the ball can move linearly with respect to the screw.

However, conventional techniques have encountered difficulties in making nuts with high helix angles. In the prior art, as shown in FIG. 1, in order to grind the thread of a nut 2, the grinding wheel 11 of the forming grinder is usually inserted into the inner side of the nut 2 to perform the grinding work on the thread groove G. The larger the helix angle of the thread groove G of the nut 2, the larger the required angle θ between the central axis of the strut 12 on which the grinding wheel 11 is mounted and the direction D in which the inner surface of the nut 2 extends. Therefore, when the helix angle of the thread groove G exceeds a certain degree (for example, 20 degrees or more), the strut 12 and the nut 2 will interfere with each other to cause vibration, which may result in a decrease in grinding precision, and may even be impossible to perform grinding. Even if the struts 12 of a smaller diameter are replaced, the rigidity of the struts 12 is insufficient, and the grinding precision caused by the vibration is more severely deteriorated, which makes the grinding work difficult.

Therefore, how to provide a nut processing method, which can grind a nut having a high helix angle, has become one of important subjects.

In view of the above problems, it is an object of the present invention to provide a method of processing a nut that can grind a nut having a high helix angle.

To achieve the above object, a method of processing a nut according to the present invention includes: providing a nut, wherein the nut has one inner side surface extending in one direction, and the inner side surface has a flat surface a flat portion and a threaded portion; the flat portion is ground by a grinder; and the threaded portion is rotated in the direction and protruded into the inner side of the nut by a super-light member.

In an embodiment, the processing method of the nut further comprises: providing a material; processing the material to form a nut; and thermally curing the nut.

In an embodiment, in the step of grinding the thread portion, the method further comprises: immersing the nut in a polishing liquid.

In one embodiment, the slurry contains a plurality of abrasive particles uniformly mixed in a medium.

In one embodiment, in the step of grinding the threaded portion, the superabrasive member engages the lead of the nut when the nut is ground.

In an embodiment, in the step of grinding the threaded portion, the super-light member has an end portion and a body portion, and the maximum width of the end portion is smaller than the maximum width of the body portion.

In one embodiment, the end portion has a top surface, and the top mask has an opening. The processing method further includes: screwing the super-light member into the opening by an adjusting member to adjust the size of the body portion to match the nut through the adjusting member.

In an embodiment, the body portion has an external thread, and in the step of grinding the threaded portion, the external thread does not directly contact the threaded portion.

In an embodiment, in the step of grinding the threaded portion, the gap between the external thread and the threaded portion is between 0.05 mm and 1 mm.

In an embodiment, in the step of grinding the threaded portion, the helix angle of the threaded portion ranges between 20 and 50 degrees.

According to the above, a method for processing a nut according to the present invention includes: providing a nut, wherein the nut has an inner side surface extending in a direction, the inner surface having a flat portion and a thread portion; and a grinder Grinding the flat portion; and rotating the threaded portion in the direction of the inner side of the nut by a super-light member. Therefore, since the super-light member is rotated along the extending direction of the inner surface and protrudes into the inner grinding thread portion of the nut, the grinding tool of the present invention does not interfere with the nut, and thus can be ground. A nut with a high helix angle.

11‧‧‧ grinding wheel

12‧‧‧ pole

2‧‧‧ nuts

21‧‧‧ inside surface

211‧‧‧ Flat Department

212‧‧‧Threading Department

3‧‧‧Super-light parts

31‧‧‧ End

311‧‧‧ top surface

32‧‧‧ Body Department

321‧‧‧ external thread

33‧‧‧ tail

4‧‧‧Clip kit

5‧‧‧Adjusting components

A‧‧‧ area

D‧‧‧ Direction

G‧‧‧Threaded groove

L‧‧‧Slurry

L1‧‧‧ abrasive particles

L2‧‧‧ media

O‧‧‧ openings

S01~S03‧‧‧Steps

Θ‧‧‧ angle

FIG. 1 is a schematic view showing a grinding process of a conventional nut.

2 is a schematic flow chart showing a method of processing a nut according to a preferred embodiment of the present invention.

3A is a schematic cross-sectional view of a nut.

3B and 3C are respectively schematic views showing a processing process of a nut according to a preferred embodiment of the present invention.

FIG. 3D is an enlarged schematic view of a region A of FIG. 3C.

4A and 4B are respectively perspective views of the super-light member and an adjusting component of FIG. 3B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of processing a nut according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.

2, FIG. 3A to FIG. 3D, wherein FIG. 2 is a schematic flow chart of a method for processing a nut according to a preferred embodiment of the present invention, and FIG. 3A is a cross-sectional view of a nut 2; 3B and FIG. 3C are respectively schematic views showing a processing process of a nut 2 according to a preferred embodiment of the present invention, and FIG. 3D is an enlarged schematic view of a region A of FIG. 3C.

The method of processing the nut of the present invention can be applied to a nut having a helix angle of between 20 and 50 degrees. As shown in FIG. 2, the processing method includes steps S01 to S03.

First, as shown in FIG. 3A, step S01 is to provide a nut 2, wherein the nut 2 has an inner side surface 21 extending in a direction D, and the inner side surface 21 has a flat portion 211 and a threaded portion 212. Here, the nut 2 is applied to, for example but not limited to, a ball screw, and the threaded portion 212 is a continuous groove. Further, the direction D is the extending direction of the inner side surface 21 of the nut 2, and in fact, the flat portion 211 and the threaded portion 212 also extend in the direction D. In the case of a long-shaped nut 2, the direction D is the long-axis direction of the nut 2.

The achievement of the nut 2 can be processed, for example, by a turning process or other process (for example, casting or forging). Wherein, a material (or a disk element, such as a metal, an alloy or a stainless steel) may be obtained by performing a thermal curing treatment after turning and milling to strengthen the hardness of the formed nut 2 . . The aforementioned thermal curing treatment step may include flame hardening or high frequency induction, which is not limited by the present invention. Moreover, in the obtained section of the nut 2, the other operational parts not described above should be in the technical field of the present invention. Those who have the usual knowledge can understand, and will not repeat them here.

Next, step S02 is performed: the flat portion 211 is polished by a grinder. Here, the flat portion 211 of the inner side surface 21 can be ground using, for example, a grinder extending in the direction D into the inner side of the nut 2 to achieve the desired accuracy. After the outer diameter grinding step, the heat-deformed portion originally formed by the surface hardening treatment can be removed together. After the grinding is completed, the inner surface 21 of the nut 2 will have a certain degree of flatness and precision, and can be used as a reference for the subsequent grinding of other parts, which is advantageous for reducing the tolerance of the overall processing process and subsequent assembly of the finished product. The means for achieving the grinding is understood by those of ordinary skill in the art to which the author belongs, and will not be described herein.

Finally, step S03 is performed: rotating the threaded portion 212 in the direction D by a super-light member 3 and extending into the inner side of the nut 2. Here, the polishing of the flat portion 211 in the step S02 and the polishing step of the screw portion 212 in the step S03 are not particularly limited, and the flat portion 211 may be polished first, and then the screw portion 212 may be polished, or the screw portion 212 may be first polished and then the flat portion may be polished. 211.

In the present embodiment, as shown in FIG. 3B and FIG. 3C, after the flat portion 211 is polished, the nut 2 is first immersed in a polishing liquid L and fixed before the grinding of the thread portion 212 in step S03. Among them, the polishing liquid L not only provides the function of grinding and lubrication, but also provides a way to dissipate heat during the grinding through the static or flowing polishing liquid L (of course, the heat dissipation effect of the flowing polishing liquid L is better). Further, as shown in FIG. 3D, the polishing liquid L may contain a plurality of abrasive grains L1 uniformly mixed in a medium L2, which is a polishing liquid having excellent chemical and mechanical properties. The medium L2 may be a cutting fluid such as Taikoo oil, and the abrasive particles L1 may be, for example, single crystal diamond particles, polycrystalline diamond particles or nano diamond particles, or other harder materials for grinding and polishing of precision metals. use.

Referring to FIG. 3B and FIG. 3C again, the super-light member 3 has an end portion 31, a body portion 32 and a tail portion 33. The body portion 32 has an external thread 321 (the body portion 32 is included in the super-light member 3). Part of the thread 321). At the time of grinding, the tail portion 33 can be held by a clamp kit 4 and rotated by, for example, a motor (not shown) to grind the threaded portion 212 through the external thread 32 of the body portion 32. Wherein, the super-light member 3 is moved in the direction D, and the lead of the nut 2 is matched with the lead (the distance that the nut 2 is rotated by one turn), and the nut 2 is moved in and out while rotating and moving back and forth. The threaded portion 212 is brought to the required precision by grinding. Due to the use of super-light parts 3 Rotating in the direction D and extending into the inner side of the nut 2 to grind the threaded portion 212, so that the super-light member 3 does not interfere with the nut 2, so the method of processing the nut of the present invention can grind the nut 2 having a high helix angle.

In addition, as shown in FIG. 3D, in the process of polishing the threaded portion 212 of the super-light member 3, the external thread 321 on the body portion 32 of the super-light member 3 is not in direct contact with the threaded portion 212 of the nut 2, and The gap between the thread 321 and the threaded portion 212 can be, for example, between 0.05 mm and 1 mm. Since the super-light member 3 has a guide angle configuration which is narrowed in width in the direction from the body portion 32 to the end portion 31 (that is, the longest outer diameter on the radial cross section of the super-light member 3, along the body portion 32 to The end portion 31 gradually becomes smaller in the direction of the end portion 31, so that when the super-light member 3 protrudes into the inner side of the nut 2, the end portion 31 having a smaller width allows the polishing liquid L to enter the wider body portion 32, retaining more grinding In the region where the body portion 32 is located, the gap between the external thread 321 and the threaded portion 212 can be filled with the polishing liquid L, and the abrasive particles L1 can be driven to the threaded portion 212 by the rotation and movement of the super-light member 3. Grinding is performed so that the surface roughness (Ra) of the threaded portion 212 can be at least 0.1 μm.

4A and 4B, the structure of the super-light member 3 used in the present embodiment, and the relationship between the super-light member 3 and an adjustment member 5 will be further described. 4A and 4B are perspective views of the super-light member and an adjusting component 5 of FIG. 3B, respectively.

As shown in FIG. 4A, the super-light member 3 may be cylindrical, and the maximum width of the tail portion 33 may be smaller than the maximum width of the body portion 32, and one end of the body portion 32 is connected to the tail portion 33, and the other end of the body portion 32 is connected. At the end 31. In addition, the end portion 31 has a top surface 311 having an opening O (herein referred to as a cross cut). The maximum width of the end portion 31 is smaller than the maximum width of the body portion 32. In other words, the cross-sectional diameter of the super-light member 3 of the present embodiment is gradually increased from the smaller end portion 31 (increased to be larger or curved), and is larger at the main body portion 32.

However, it is worth mentioning that, as shown in FIG. 4B, in order to make the super-light member 3 applicable to the nut 2 of different sizes, for example, when grinding the nut 2 of a larger size, before the grinding, the present invention The processing method may further include: screwing an opening O of the top surface 311 into the super-light member 3 by an adjusting member 5 (for example, a screw) to adjust (enlarge) the size of the body portion 32 through the adjusting member 5 to match Suitable for nuts 2 of different inner diameter sizes.

In summary, the method for processing a nut according to the present invention includes: providing a nut, wherein the nut has an inner side surface extending in a direction, the inner surface having a flat portion and a screw a flat portion; the flat portion is ground by a grinder; and the threaded portion is rotated in the direction and protruded into the inner side of the nut by a super-light member. Therefore, since the super-light member is rotated along the extending direction of the inner surface and protrudes into the inner grinding thread portion of the nut, the grinding tool of the present invention does not interfere with the nut, and thus can be ground. A nut with a high helix angle.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

S01~S03‧‧‧Steps

Claims (8)

A method for processing a nut, comprising: providing a nut, wherein the nut has an inner side surface extending in a direction, the inner surface having a flat portion and a threaded portion; the flat portion is ground by a sand conveyor And grinding the threaded portion by rotating and extending into the inner side of the nut by a super-light member, wherein the super-light member grinds the nut to match the lead of the nut, and the super-light member has one end And a body portion, the maximum width of the end portion being smaller than the maximum width of the body portion. The method for processing a nut according to claim 1, further comprising: providing a material; processing the material to form the nut; and thermally curing the nut. The method for processing a nut according to claim 1, wherein the step of grinding the threaded portion further comprises: immersing the nut in a polishing liquid. The method for processing a nut according to claim 3, wherein the slurry comprises a plurality of abrasive particles uniformly mixed in a medium. The method for processing a nut according to claim 1, wherein the end portion has a top surface, and the top mask has an opening, the processing method further comprises: screwing the opening into the super by the adjusting member The light member is adapted to adjust the size of the body portion through the adjusting member to match the nut. The method for processing a nut according to claim 1, wherein the body portion has an external thread, and the step of grinding the thread portion does not directly contact the thread portion. The method for processing a nut according to claim 6, wherein in the step of grinding the threaded portion, the gap between the external thread and the threaded portion is between 0.05 mm and 1 mm. The method of processing a nut according to claim 1, wherein in the step of grinding the threaded portion, the helix angle of the threaded portion ranges between 20 and 50 degrees.