JP2014114327A - Method for bonding to metal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce various troubles occurring in conventional substrate treatment when a friction member or the like is bonded to a metal member.SOLUTION: A bonding method, which is a method for bonding a member to be bonded to the surface of a metal member, includes a substrate treatment step and a bonding step. In the substrate treatment step, a pulse laser beam is irradiated to the surface of the metal member to form a rugged part on the surface of the metal member. In the bonding step, an adhesive is applied to the surface of the metal member having been subjected to the substrate treatment to bond the member to be bonded to the surface of the metal member.

Description

  The present invention relates to a bonding method, and more particularly to a bonding method for bonding a member to be bonded to the surface of a metal member.

  For example, a lock-up clutch device of a torque converter is provided with a piston to which a friction member such as paper is bonded. The ground surface treatment is performed on the sticking surface of the friction member of the piston so that the adhesive strength of the friction member is increased. Such a ground treatment is shown in Patent Document 1 and Patent Document 2, for example.

  In Patent Document 1, shot blasting is performed in which a sand-like abrasive is sprayed on the surface of a metal member. Moreover, in patent document 2, a primary blast process is performed on the surface of a metal member, and it scrapes off so that a part of blast impression may remain by grinding | polishing after that. Further, as the secondary blasting process, the blasting process is performed with a projection material finer than the projection material used for the primary blasting process.

JP-A-9-324824 JP 2005-224902 A

  In the blasting process performed in the conventional ground treatment, irregularities are formed on the surface of the metal member by colliding the granular projection material with the metal member.

  However, the projection material is pulverized with the processing time and becomes powdery. This powdery blasting material scatters around the processing equipment, causes the equipment to break down by entering the sliding surface of the equipment and electrical contacts, and leads to deterioration of the work environment. In addition, when these powdery projection materials are mixed into the product, the friction performance is deteriorated in the friction portion, and the oil passage may be clogged. Furthermore, if the product enters the bearing portion of the product, the bearing may be seized.

  Although chemical conversion treatment such as etching may be performed as a base treatment, the chemical conversion treatment requires a long number of steps, complicated and large equipment, and management of waste liquid is difficult. Moreover, since a powdery projection material adheres to the member after a process, a washing | cleaning process is needed as a post process.

  An object of the present invention is to alleviate various problems in the conventional background processing as described above.

  The method for adhering to a metal member according to the first invention is a method for adhering a member to be bonded to the surface of the metal member, and includes a base treatment step and an adhesion step. In the ground treatment step, the surface of the metal member is irradiated with pulsed laser light to form irregularities on the surface of the metal member. In the bonding step, an adhesive is applied to the surface of the metal member that has been subjected to the base treatment, and the member to be bonded is bonded.

  Here, in the ground treatment step, the surface of the metal member is irradiated with pulsed laser light, and irregularities are formed on the surface of the metal member. For this reason, generation | occurrence | production of the dust like the conventional blasting process is suppressed, and the bad influence to peripheral facilities by the scattering of dust and the performance degradation of a product are suppressed.

  The method for adhering to a metal member according to the second invention is the method according to the first invention, wherein the metal member is subjected to surface hardening treatment as a pre-process of the base treatment process.

  In the method for adhering to a metal member according to the third aspect of the present invention, in the method of the first or second aspect, the processing depth to the surface of the metal member is set to 15 μm or more and 40 μm or less in the base treatment step.

  The method for adhering to a metal member according to a fourth aspect of the present invention is the method according to any one of the first to third aspects, wherein the processing area for forming irregularities is 10% or more with respect to the adhesion area in the base treatment step. Process.

  The method for adhering to a metal member according to a fifth aspect of the present invention is the method according to any one of the first to fourth aspects, wherein a YAG laser is used as the laser in the base treatment step, and the laser irradiation condition is an output of 100 w or more and a repetition frequency. Is 6.5 kHz or more.

  In the present invention as described above, dust scattering can be suppressed in the ground treatment process as compared with the conventional blasting process, and therefore adverse effects on peripheral equipment and product performance deterioration can be suppressed. In addition, the work environment can be improved.

The whole lineblock diagram of the torque converter provided with the piston to which the adhesion method by one embodiment of the present invention is applied.

[First Embodiment]
<Adhesion target>
Here, a case where a paper friction facing is bonded to a piston used in a lockup device of a torque converter will be described as an example.

  FIG. 1 shows the overall configuration of a torque converter having a lockup device. An outline of this torque converter will be described. In FIG. 1, an engine (not shown) is arranged on the left side of the torque converter 1, and a transmission (not shown) is arranged on the right side of the torque converter 1. A line OO shown in FIG. 1 is a rotating shaft of the torque converter 1.

  The torque converter 1 is a device for transmitting power generated in the engine to a transmission via a fluid, and includes a front cover 2, an impeller 3, a turbine 4, a stator 5, and a lockup device 6.

  Power is input from the engine to the front cover 2, and this power is input to the impeller 3 fixed to the front cover 2. The power is transmitted from the impeller 3 to the turbine 4 via the fluid, and then transmitted to the input shaft of the transmission connected to the turbine 4. The fluid that has flowed into the turbine 4 is returned to the impeller 3 via the stator 5.

  The lockup device 6 is a device for mechanically connecting the front cover 2 and the turbine 4, and includes a piston 10, a drive plate 11, and a damper mechanism 12.

  The piston 10 is formed in a disc shape, and has a cylindrical portion 10a on the inner peripheral portion and a friction engagement portion 10b to which a friction facing 14 is bonded on the outer peripheral portion. The cylindrical portion 10a is supported on the outer peripheral surface of the turbine hub 4a so as to be slidable in the axial direction. Thus, since piston 10 has a sliding part, nitriding treatment is made as surface hardening processing. The piston 10 may not be nitrided.

<Adhesion method>
When the friction facing 14 is bonded to the friction engaging portion 10b of the piston 10 as described above, first, the surface treatment is performed on the surface of the friction engaging portion 10b of the piston 10.

  In the ground treatment, the surface of the frictional engagement portion 10b is irradiated with laser light to form irregularities on the surface.

  Next, a friction facing is bonded to the friction engagement portion 10b subjected to the base treatment.

<Experimental example>
Table 1 below shows the irradiation conditions of the pulse laser beam and the peeling evaluation when the above method is performed. In this case, a YAG laser was used as the laser beam, and an experiment was conducted on a nitriding piston.

「耐久試験」は、以下の内容を示しており、各項目についてすべて問題なかった場合を「○」としている。

The “endurance test” indicates the following contents, and “○” indicates that there was no problem for each item.

Durability test items: A test for immersing in a solution for a certain period of time and confirming the presence or absence of peeling: The sample was immersed in a 1% aqueous solution of NaOH maintained at 90 ° C. ± 3 ° C., and the presence or absence of peeling was visually confirmed. And the case where there is no peeling after immersion for 380 minutes or more is regarded as no problem.
・ A test to make a cut in the adherend, hold it in a constant atmosphere for a certain period of time, and judge the degree of peeling: A sample with an oblong cut of about 2 mm square on the adherend is 85 ° C. or higher and 95% RH ( (Relative humidity) After holding for 6 hours in a constant temperature and humidity chamber, the adherend is peeled off with an adhesive tape or the like within 10 minutes.
-Tensile test: If it is pulled at 450 N or more and the peel rate is 0%, there is no problem.
Table 2 below shows the relationship between the processing depth, the processing area, and the durability test result of the frictional engagement portion 10b in which irregularities are formed by the base treatment.

<Summary of First Embodiment>
From the above experimental examples, the following can be understood.

  (1) In the ground treatment process, it is preferable to use a YAG laser as the laser and set the laser irradiation conditions as follows.

Laser beam scanning speed: 193 m / min
Output: 100 w or more Repetition frequency: 6.5 kHz or more Processing depth: 15 μm or more and 40 μm or less Processing area (area for forming irregularities): 10% or more with respect to the bonding area. Same as 1.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and various changes or modifications can be made without departing from the scope of the present invention.

10 Piston 10b Friction engagement part 14 Friction facing

Claims (5)

A method for bonding a member to be bonded to the surface of a metal member,
Irradiating the surface of the metal member with pulsed laser light, and forming an unevenness on the surface of the metal member;
An adhesion step of applying an adhesive to the surface of the metal member subjected to the base treatment and bonding the adherend;
A method of bonding to a metal member including   The method for adhering to the metal member according to claim 1, wherein the metal member is subjected to a surface hardening process as a pre-process of the base treatment process.   3. The method for bonding to a metal member according to claim 1, wherein in the base treatment step, a processing depth on the surface of the metal member is set to 15 μm or more and 40 μm or less.   The method for adhering to a metal member according to any one of claims 1 to 3, wherein in the base treatment step, processing is performed so that a processing area for forming irregularities is 10% or more with respect to an adhesion area. In the ground treatment step, a YAG laser is used as a laser, and laser irradiation conditions are an output of 100 w or more and a repetition frequency of 6.5 kHz or more.
The method for bonding to a metal member according to claim 1.

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