JP3954133B2 - Method for manufacturing moving block of rolling guide device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to a method of manufacturing a rolling guide equipment of the movable block movable block is moved being guided by the guide rail through a number of rolling elements.
[0002]
[Prior art]
As a conventional rolling guide device of this type, the present applicant has already introduced a circulation path forming body that forms a circulation path of a rolling element into a mold as shown in JP-A-7-317762. It proposes a technology to insert and integrally mold. That is, in this rolling guide apparatus, a moving block is formed by insert-molding a circulation path forming body that circulates and guides a large number of rolling elements between a load area and a no-load area in the block body, and this moving block is inserted into the block body. The guide rail is configured to move through the rolling elements.
[0003]
The circulation path forming body includes a return passage forming portion that forms a ball return passage in a no-load region and a rolling member holding portion that is provided on a side edge of the rolling element rolling portion in the load region. The axial direction extends over the entire axial length of the block body. A forming portion and an end surface forming portion which is provided on the end surface of the block main body and constitutes the direction change path inner periphery guiding portion, and the axial direction forming portion and the end surface forming portion are simultaneously integrally molded. It was.
[0004]
[Problems to be solved by the invention]
However, in the case of the above-described prior art, since the axial direction forming portion such as the return passage forming portion and the rolling element holding portion is insert-molded simultaneously with the end surface forming portion in the block body, the axial direction forming portion is cooled. Due to the axial shrinkage during curing, the connecting portion between the axial direction forming portion and the end surface forming portion is pressed against the corner portion of the block main body to cause stress concentration, and the boundary portion between the axial direction forming portion and the end surface forming portion is cracked. It tends to occur. When cracking occurs, smooth rolling movement of the rolling elements is hindered.
[0005]
As a measure to alleviate this crack, a method of reducing the stress concentration by chamfering the corner of the block body where the connecting part between the axial direction forming part and the end face forming part is located can be considered. Concentration cannot be completely eliminated.
[0006]
The present invention has been made to solve the above-described problems of the prior art, and its object is to prevent stress concentration from occurring at the boundary between the axial direction forming portion and the end surface forming portion during insert molding. An object of the present invention is to provide a rolling guide device and a method for manufacturing the moving block capable of preventing the circulation path forming body from being cracked.
[0007]
[Means for Solving the Problems]
In order to solve this problem, in the present invention,
A circulation path forming body that circulates and guides a large number of rolling elements between a load area and a no-load area in the block body is insert-molded.
The axial direction of the block main body in which the circulation path forming body has a return passage forming portion that forms a rolling element return passage in a no-load region and a rolling member holding portion that is provided on a side edge of a loaded rolling element rolling portion in a load region Provided at both ends of the block main body constituting the axial direction forming portion formed over the entire length, and the rolling body direction changing path that communicates between the rolling element rolling portion in the load area and the rolling element return path in the no load area. An end face forming part integrally connected to the axial direction forming part,
The end face forming portion is provided with an inner peripheral guide portion that constitutes the rolling element direction changing path,
Of the axial direction forming portion and the end surface forming portion constituting the circulation path forming body, the return passage forming portion, the rolling element holding portion, and the inner peripheral guide portion are connected endlessly around the block body. In the manufacturing method of the moving block of the rolling guide device,
Preparing the block body;
A first step of inserting the block body into a mold and molding the axial direction forming portion over the entire length of the block body by insert molding;
And a second step of inserting the block main body formed with the axial direction forming portion into a mold and integrally forming the end surface forming portion on the end surface by insert molding .
[0013]
Thus, since the end face forming portion is formed in the second step after the axial forming portion is cooled and hardened in the first step, the material at the time of cooling is connected to the connecting portion between the axial direction forming portion and the end face forming portion. Stress concentration due to shrinkage is reduced, and cracking of the connecting portion can be prevented. Therefore, the boundary part between the inner periphery guide part and the return path of the direction change path is continuously formed, and the rolling element smoothly rolls.
In the second step, the block main body formed with the axial direction forming portion has a part of the mold at the entrance portion between the rolling element rolling portion in the load region and the return passage forming portion formed in the first step. It is preferable that the end face forming portion is integrally formed on the end face by insert molding by supporting it in the mold so as to be inserted.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0015]
FIG. 1 shows a rolling guide apparatus according to an embodiment of the present invention.
[0016]
In the figure, reference numeral 1 denotes the whole rolling guide device. This rolling guide device 1 is schematically moved through a guide rail 2 and a ball row 3 comprising balls 3a as a number of rolling elements on the guide rail 2. And a movable block 4 provided freely.
[0017]
The guide rail 2 is a long member having a substantially quadrangular cross section. The moving block 4 is connected to the upper and lower end portions of the guide rail 2 via four rows of ball rows 3, 3, 3, and 3 at the upper end of the left and right side surfaces. The four upper ends of the upper surface and the upper ends of the left and right side surfaces correspond to the four rows of ball rows 3, 3, 3 and 4 as four rolling ball rolling portions as the rolling elements. Running grooves 5, 5, 5, 5 are provided over the entire length.
[0018]
In the moving block 4, the moving block 4 is configured by insert molding a circulation path forming body 7 that circulates and guides the four ball rows 3, 3, 3, 3 between the load area and the no-load area on the block body 6. ing.
[0019]
The moving block 4 is a U-shaped block body having a horizontal portion 8 facing the upper surface of the guide rail 2 and a pair of support legs 9, 9 facing the left and right side surfaces of the track rail 2. 8 The load ball rolling grooves 10 and 10 corresponding to the two load ball rolling grooves 5 and 5 provided on the track rail 2 on the lower surface are provided on the inner surfaces of the left and right support legs 9 and 9 on the track rail 2. Loaded ball rolling grooves 10 and 10 corresponding to the loaded ball rolling grooves 5 and 5 provided on the left and right side surfaces are provided. Further, the solid portion of the horizontal portion 8 and the support leg portions 9 and 9 extend in the axial direction as a rolling element return passage for returning from one end of each load ball rolling groove 10, 10, 10, 10 to the other end. Four rows of ball return passages 11, 11, 11, 11 are provided.
[0020]
The circulation path forming body 7 includes an axial direction forming portion 71 formed over the entire axial length of the block body 6 and an end surface forming portion 72 formed on both end surfaces of the block body 6 and connected to the axial direction forming portion 71. The axial direction formation part 71 and the end surface formation part 72 are comprised by the molded object separately shape | molded by insert molding. In this embodiment, the axial direction formation part 71 is shape | molded by primary insert molding, and the end surface formation part 72 is shape | molded by secondary insert molding after that.
[0021]
The axial direction formation part 71 is provided along the side edge of the return path formation part 11a which forms the ball return path 11, 11, 11, 11 of a no-load area | region, and the load ball rolling groove 10,10,10,10. .. Are provided.
[0022]
On the other hand, the end face forming portion 72 communicates the end portions of the loaded ball rolling grooves 10, 10, 10, 10 of the ball rows 3, 3, 3, 3 with the end portions of the ball return passages 11, 11, 11, 11. Concave portions 13, 13, 13, 13 are provided at portions corresponding to the direction change paths 12, 12, 12, 12 that are curved in a letter shape. Inner periphery guide portions 12a, 12a, 12a, 12a of the direction change path are formed in the recesses 13, 13, 13, 13 and the recesses 13, 13, 13, 13 are separated from the end face forming portion 72. The structured deflectors 14, 14, 14, 14 are fitted. The deflectors 14, 14, 14, 14 are provided with outer peripheral guide portions 12 b, 12 b, 12 b, 12 b of the direction change paths, and the direction change paths 12, 12 between the inner peripheral guide portions 12 a, 12 a, 12 a, 12 a. , 12 and 12 are configured. The inner peripheral guide portions 12a, 12a, 12a, and 12a are integrally formed with the end surface forming portion 72. However, in some cases, the concave portion 13 is formed by separately forming a piece that forms the inner peripheral guide portions 12a, 12a, 12a, and 12a. , 13, 13, and 13 may be fitted.
[0023]
The axial direction forming portion 71 and the end surface forming portion 72 are formed by resin molding, but can also be formed by aluminum die casting, zinc die casting, or the like.
[0024]
Next, a method for manufacturing the moving block 4 having such a configuration will be described.
[0025]
First, as shown to Fig.2 (a), the metal block main body 6 which should integrally form the circulation path formation body 7 is prepared.
[0026]
And this block main body 6 is inserted in a metal mold | die, and as shown in FIG.2 (b) and (c) by primary insert molding as a 1st process, the axial direction formation part of the circulation path formation body 7 is shown. An intermediate formed body 101 is formed by forming the return passage forming portion 11a and the ball holding portions 15,.
[0027]
After the axial direction forming portion 71 is cooled and hardened, as shown in FIGS. 2D and 2E, the inner peripheral guide portion 12a of the direction change path 12 is provided by secondary insert molding as the second step. The end face forming part 72 is formed on the end face of the block main body 4 and is continuous with the return path forming part 11a and the ball holding part 15 formed by primary insert molding.
[0028]
In this case, the block main body 6 is supported by inserting a part of the mold at the time of the secondary insert molding into the entrance portion of the ball holding portion 15 and the return passage forming portion 11a formed by the primary insert molding. By injecting and filling the molding material in this state, the inner peripheral guide portion 12a formed on the end surface forming portion 72 is smoothly continued. Moreover, the recessed part 13 of the end surface formation part 72 can be accurately formed in the ball rolling groove 10 position.
[0029]
On the other hand, the deflector 14 is molded by another molding apparatus, and the deflector 14 is fitted into the recess 13, whereby the direction change path 12 is configured by the outer periphery guide portion 12 b of the deflector 14 and the inner periphery guide portion 12 a in the recess 13. Is done.
[0030]
Thus, since the end surface forming portion 72 is formed after the axial direction forming portion 71 is cooled and hardened and contracted by primary insert molding, the material at the time of cooling is connected to the connecting portion between the axial direction forming portion 71 and the end surface forming portion 72. The stress due to the shrinkage does not occur, and cracking of the connecting portion can be prevented. Therefore, the boundary part between the inner periphery guide part 12a of the direction change path 12 and the return channel | path 11 is shape | molded continuously, and the ball | bowl 3 rolls smoothly.
[0031]
Further, since there is no stress concentration at the connecting portion between the axial direction forming portion 71 and the end surface forming portion 72, it is not necessary to chamfer the corner portion of the block body 6 for stress relaxation, and the workability is good.
[0032]
Further, the end surface forming portion 71 is formed by secondary insert molding so that the inner peripheral guide portion 12a, the return passage 11 and the ball holding portion 13 are smoothly continuous, so that the ball 3a can be smoothly circulated and guided. it can.
[0033]
FIG. 3 shows another form of the circulation path forming body 7.
[0034]
In this embodiment, the end surface forming portion 72 ′ includes the inner peripheral guide portion 12 a of the direction change path 12, and the end plate 16 including the outer peripheral guide portion 12 b having a separate structure from the end surface forming portion 72 ′ is the end surface. It is configured to be attached to the forming portion 72 ′. The end plate 16 is fixed to the block body 6 with a fixing tool such as a screw.
[0035]
The present invention can be applied not only to the rolling guide device of the above embodiment but also to a rolling guide device such as a ball screw, a ball spline, or a ball bush.
[0036]
【The invention's effect】
As described above, according to the present invention, since the axial direction forming portion and the end surface forming portion are separately insert-molded, the axial direction forming portion and the end surface forming portion are each cooled and hardened independently, and even when contracted during cooling. Excessive stress does not act on the connecting portion with the end face forming portion, and cracking of the connecting portion can be prevented. Therefore, the connecting portion is continuously formed and the rolling element smoothly rolls.
[0037]
Further, it is not necessary to perform extra processing on the block body, and workability is improved.
[0038]
Furthermore, according to the moving block manufacturing method of the present invention, since the end face forming portion is formed after the axial direction forming portion is cooled and hardened, the stress concentration at the connecting portion between the axial direction forming portion and the end face forming portion is more effectively reduced. Can be reduced.
[Brief description of the drawings]
1A and 1B show a rolling guide device according to an embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view, and FIG. 1B is a diagram showing a configuration of a ball circulation path; FIG. 3C is a schematic perspective view of the moving block.
FIG. 2 (a) is a view showing a blank of the moving block body, FIG. 2 (b) is a half sectional view of an intermediate molded body formed by primary insert molding, and FIG. 2 (c) is a view of FIG. 2 (b). The cc line sectional drawing, the figure (d) is a semi-front view of the secondary fabrication object by which secondary insert molding was carried out, and the figure (e) is the ee line sectional view of the figure (d).
FIG. 3 (a) is a schematic partial sectional view of a circulation path forming body of a rolling guide device according to another embodiment of the present invention, and FIG. 3 (b) is a schematic perspective view of a moving block.
[Explanation of symbols]
1 Linear motion guide device 2 Guide rail 3 Ball train (rolling member train)
3a Ball (rolling element)
4 Moving block 5 Loaded ball rolling groove (Loaded rolling element rolling part)
6 Block body 7 Circulation path forming body 71 Axial direction forming part 72 End face forming part 10 Loaded ball rolling groove (loaded rolling element rolling part)
11 Ball return path 11a Return path forming part 15 Ball holding part 12 Direction changing path 12a Inner peripheral guide part 12b Outer peripheral guide part 13 Recessed part 14 Deflector 15 Ball holding part 16 End plate

Claims (2)

A circulation path forming body that circulates and guides a large number of rolling elements between a load area and a no-load area in the block body is insert-molded.
The axial direction of the block main body in which the circulation path forming body has a return passage forming portion that forms a rolling element return passage in a no-load region and a rolling member holding portion that is provided on a side edge of a loaded rolling element rolling portion in a load region Provided at both ends of the block main body constituting the axial direction forming portion formed over the entire length, and the rolling body direction changing path that communicates between the rolling element rolling portion in the load area and the rolling element return path in the no load area. An end face forming part integrally connected to the axial direction forming part,
The end face forming portion is provided with an inner peripheral guide portion that constitutes the rolling element direction changing path,
Of the axial direction forming portion and the end surface forming portion constituting the circulation path forming body, the return passage forming portion, the rolling element holding portion, and the inner peripheral guide portion are connected endlessly around the block body. In the manufacturing method of the moving block of the rolling guide device,
Preparing the block body;
A first step of inserting the block body into a mold and molding the axial direction forming portion over the entire length of the block body by insert molding;
A moving block of a rolling guide device comprising: a second step of inserting a block body in which the axial direction forming portion is formed into a mold and integrally forming the end surface forming portion on an end surface thereof by insert molding. Manufacturing method. In the second step, the block main body formed with the axial direction forming portion has a part of the mold at the entrance portion between the rolling element rolling portion in the load region and the return passage forming portion formed in the first step. 2. The method of manufacturing a moving block of a rolling guide device according to claim 1 , wherein an end face forming portion is integrally formed on an end face of the end face by insert molding by supporting in the mold so as to be inserted.

Images